A RAILWAY SWITCH ASSEMBLY

Abstract

 A railway switch assembly comprising a first switch unit (11) configured for controlling switching movement of a first switch rail (21) and a second switch unit (12) configured for controlling switching movement of a second switch rail (22). Each of the first and second switch units (11, 12) includes: a rigid elongated metal frame structure (31, 32) defining a longitudinal direction and a lateral direction and configured for being fastened to a underlying support structure (4), wherein the frame structure has an elongated bottom wall (5) and first and second elongated side walls (6, 7) jointly defining an elongated space (8), and an elongated stock rail support region (9) located next to the elongated space (8) and arranged for receiving a stationary stock rail (19, 20); an elongated motion casing (51, 52) arrangeable in the elongated space, wherein the motion casing holds a vertical displacement mechanism that is arranged to translate a linear switching motion of a driving assembly (14) to a vertical switch motion of a vertical motion assembly (15) or the switch rail (21, 22), wherein the driving assembly (14) is arranged to be displaced in a direction substantially parallel to a longitudinal direction of the switch rail (21, 22) or substantially parallel with a longitudinal direction of the switch unit (11, 12); a driving actuator (13) fastenable to the frame structure (31, 32) and operatively connectable with the driving assembly (14) for controlling displacement of the driving assembly; a switch rail (21, 22) attachable to a top side of the motion casing (51, 52), wherein the switch rail is vertically displaceable by means of the vertical displacement mechanism for enabling a vertical switch movement of the switch rail (21, 22) between an upper and lower switch state; and a stationary stock rail (19, 20) fastenable to the elongated stock rail support region (9) of the frame structure (31, 32).

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a railway switch assembly, in particular a railway switch assembly for a tram line, trolley line, or similar types of light rail transit, but also suitable for heavy rail transit applications. Hence, the disclosure relates both to a railway switch assembly and a tram switch assembly. The disclosure further relates to a method for providing a railway switch assembly, as well as a method for removing an elongated motion casing from a first switch unit of a railway switch assembly.

[0002] Moreover, even if the railway switch assembly according to the disclosure will be described primarily in connection with implementation as a tram switch, the railway switch assembly according to the disclosure is not strictly restricted to this particular type of implementation, but may alternatively be installed or implemented in other types of railway switch assembly implementations, such as for example conventional heavy railway installations, high-speed railway installations, metro (underground) railway installations, freight railway installations, etc.

BACKGROUND

[0003] In the field of conventional railway switches with horizontally moving switching tongues, there has generally been a problem with blocked switching motion of the switches, especially during winter condition with ice and snow. One solution to this problem involves using vertically moving switch tongues, as for example showed in documents WO2016/148631 A1 and WO2019/098925 A1, because vertically moving switch tongues are generally less sensitive to motion blocking by ice or snow. However, despite the activities in the field, there is a demand for an improved railway switch assembly, which is capable of meeting the requirements as to improved compactness, height, modularity, maintenance friendly and simple installation. Moreover, there is a demand for providing a railway switch assembly that is particularly suitable for a tram line, trolley line, or similar types of light rail transit.

SUMMARY

[0004] An object of the present disclosure is to provide a railway switch assembly where the previously mentioned problems are avoided. This object is at least partly achieved by the features of the independent claims.

[0005] According to a first aspect of the present disclosure, there is provided a railway switch assembly comprising a first switch unit configured for controlling switching movement of a first switch rail and a second switch unit configured for controlling switching movement of a second switch rail. Each of the first and second switch units includes: a rigid elongated metal frame structure defining a longitudinal direction and a lateral direction and configured for being fastened to a underlying support structure, wherein the frame structure has an elongated bottom wall and first and second elongated side walls jointly defining an elongated space, and an elongated stock rail support region located next to the elongated space and arranged for receiving a stationary stock rail; an elongated motion casing arrangeable in the elongated space, wherein the motion casing holds a vertical displacement mechanism that is arranged to translate a linear switching motion of a driving assembly to a vertical switch motion of a vertical motion assembly or the switch rail, wherein the driving assembly is arranged to be displaced in a direction substantially parallel to a longitudinal direction of the switch rail or substantially parallel with a longitudinal direction of the switch unit; a driving actuator fastenable to the frame structure and operatively connectable with the driving assembly for controlling displacement of the driving assembly; a switch rail attachable to a top side of the motion casing, wherein the switch rail is vertically displaceable by means of the vertical displacement mechanism for enabling a vertical switch movement of the switch rail between an upper and lower switch state; and a stationary stock rail fastenable to the elongated stock rail support region of the frame structure.

[0006] According to a second aspect of the present disclosure, there is provided a method for providing a railway switch assembly comprising a first switch unit configured for controlling switching movement of a first switch rail and a second switch unit configured for controlling switching movement of a second switch rail. The method comprises, for each of the first and second switch units: fastening a rigid elongated metal frame structure to a underlying support structure, wherein the metal frame structure has an elongated bottom wall and first and second elongated side walls jointly defining an elongated space, and an elongated stock rail support region located next to the elongated space and arranged for receiving a stationary stock rail; installing an elongated motion casing in the elongated space, wherein the elongated motion casing has a vertical displacement mechanism that is arranged to translate a linear switching motion of a driving assembly to a vertical switch motion of a vertical motion assembly or the switch rail, wherein the driving assembly is arranged to be displaced in a direction substantially parallel to a longitudinal direction of the switch rail or substantially parallel with a longitudinal direction of the switch unit; fastening a driving actuator to the frame structure and operatively connecting the driving actuator with the driving assembly for controlling displacement of the driving assembly; attaching a switch rail to a top side of the motion casing, wherein the switch rail is vertically displaceable by means of the vertical displacement mechanism for enabling a vertical switch movement of the switch rail between an upper and lower switch state; and fastening a stationary stock rail to the elongated stock rail support region of the frame structure.

[0007] According to a third aspect of the present disclosure, there is provided a method for removing an elongated motion casing from a first switch unit of a railway switch assembly that comprises a first switch unit configured for controlling switching movement of a first switch rail and a second switch unit configured for controlling switching movement of a second switch rail. The method comprises: removing a removable maintenance cover from a stationary rigid elongated metal frame structure of the first switch unit for enabling access to a maintenance space located within the frame structure, wherein the metal frame structure is fastened to an underlying support structure and is made of an elongated bottom wall and first and second elongated side walls, which walls jointly define the maintenance space and a neighbouring elongated space, and wherein a stationary stock rail is located next to the elongated space and attached to an elongated stock rail support region of the metal frame structure; detaching or unfastening a motion casing, which is located in the elongated space, from the metal frame structure and subsequently lifting and/or rotating the motion casing vertically upwards for removing the elongated motion casing from the first switch unit, wherein the elongated motion casing has a switch rail attached to a top side of the motion casing and a vertical displacement mechanism that is arranged to translate a linear switching motion of a driving assembly to a vertical switch motion of a vertical motion assembly or the switch rail, and wherein, in an installed state of the motion casing, the driving assembly is arranged to be displaced in a direction substantially parallel to a longitudinal direction of the switch rail or substantially parallel with a longitudinal direction of the first switch unit, and the switch rail is vertically displaceable by means of the vertical displacement mechanism for enabling a vertical switch movement of the switch rail between an upper and lower switch state.

[0008] In this way, a particularly compact, modular and maintenance friendly railway switch assembly is provided, which railway switch assembly enables a very simple installation and removal of the elongated motion casing with the vertical displacement mechanism.

[0009] Specifically, by providing each of the first and second switch units with a rigid elongated metal frame structure, the switch units may be made smaller and more compact due to the inherent strength of a metal frame. Moreover, the integral elongated stock rail support region results in further improved compactness of the switch, and the elongated motion casing arrangeable in the elongated space simple removal and mounting of the motion casing to the frame structure, and the side wall of the frame provides good lateral support to the motion casing. Finally, by also having the driving actuator integrated and fastenable to the frame structure, a higher level of pre-manufacturing is enabled, thereby further simplifying installation.

[0010] Moreover, the rigid elongated metal frame structure, the integral elongated stock rail support region, the removable elongated motion casing and the higher level of possible pre-manufacturing provides a railway switch assembly that is particularly suitable for a tram line, trolley line, or similar types of light rail transit.

[0011] The modular and free-standing design of each switch unit of the railway switch assembly enables installation on existing support plate, for example in connection with modernisation of a railway switch assembly, thereby eliminating the need for replacing also the underlying existing support plate that may be re-used.

[0012] The vertical shift motion of the first and second switch units further renders the tem particularly suitable for winter condition, because ice and snow cannot easily enter into the switching mechanism when inactive, contrary to conventional laterally shifting switches where snow and ice easily enters the switching mechanism. Moreover, the individual switch control of the first and second switch units enables both the first and second switch units to be located in the upper switch state when waiting for the next activity, thereby further reducing the risk for snow and ice entering the switch mechanism.

[0013] Further advantages are achieved by implementing one or several of the features of the dependent claims.

[0014] In some example embodiments, the motion casing is removably attached to the frame structure.

[0015] In some example embodiments, the frame structure is a monoblock frame structure, i.e. metal parts welded together to form one single rigid body.

[0016] In some example embodiments, the interior dimension of the elongated space in the lateral direction substantially matches the corresponding exterior dimension of the motion casing for enabling lateral support to the motion casing. Matches here refers to a lateral gap of about 1-10 mm between the elongated space and the exterior dimension of the motion casing.

[0017] In some example embodiments, the interior dimension of the elongated space in the longitudinal exceeds the corresponding exterior dimension of the motion casing with about 5 - 100 mm for enabling simple installation and longitudinal fixation of the motion casing in the elongated space.

[0018] In some example embodiments, the first and second switch units are interconnected by a plurality of rigid lateral distance keepers, each of which is fastened to the frame structure of each of the first and second switch units.

[0019] In some example embodiments, the motion casing has a first permanent projection or recess arranged at a first longitudinal end region thereof and second permanent projection or recess arranged at a second longitudinal end region thereof, wherein the frame structure has a permanent projection or recess arranged at a first longitudinal end region of the elongated space and adjustable projection arranged at a second longitudinal end region of the elongated space, wherein the motion casing is arranged to be installed in the elongated space and secured to the frame structure by first moving the motion casing in the longitudinal direction until the first permanent projection or recess of the motion casing becomes interlockingly engaged with the permanent projection or recess of the frame structure, and subsequently adjusting the adjustable projection for interlocking engagement with the second permanent projection or recess of the motion casing.

[0020] In some example embodiments, the motion casing has a base part with a bottom wall and two lateral side walls extending mainly in the lateral direction and two longitudinal side walls extending mainly in the longitudinal direction, wherein the bottom wall protrudes outwards relative to the two lateral side walls in the longitudinal direction, thereby defining the first and second permanent projections arranged at the first and second longitudinal end regions, respectively, for securing the motion casing to the frame structure.

[0021] In some example embodiments, the driving assembly includes a metal plate that is in contact with, and slidably arranged in the longitudinal direction relative to, a bottom plate of the motion casing, and wherein the bottom plate of the motion casing rests on and is in contact with the bottom wall of the frame structure.

[0022] In some example embodiments, the driving actuator of each switch unit is controllable independently from each other for enabling independent and individual switch movement of each of the first and second switch rails.

[0023] In some example embodiments, the elongated bottom wall and the first and second elongated side walls of the frame structure further jointly defines a maintenance space, and the driving actuator fastened to the frame structure within the maintenance space.

[0024] In some example embodiments, the maintenance space is closed in the vertical direction by means of a removable maintenance cover.

[0025] In some example embodiments, the driving assembly of the vertical displacement mechanism is secured to the motion casing, in the vertical direction, by means of a removable elongated locking member that extends along a substantial length of the motion casing and engages an upwards directed abutment surface of the driving assembly and a downwards directed abutment surface of the motion casing, in particular a side wall of the motion casing.

[0026] In some example embodiments, the vertical displacement mechanism includes a plurality of linkage arm assemblies that are pivotally connected to both the driving assembly and the vertical motion assembly or the switch rail, such that a linear switching motion of a driving assembly results in vertical switch motion of a vertical motion assembly or the switch rail, wherein the vertical displacement mechanism further includes a first set of load carrying blocks associated with the driving assembly and a second set of load carrying blocks associated with the vertical motion assembly or the switch rail, wherein the first and second set of load carrying blocks are facing each other in the vertical direction and in load-transmitting contact with each other when the switch rail is in the upper switch state, and wherein the first and second set of load carrying blocks are interleaved when the switch rail is in the lower switch state.

[0027] In some example embodiments, the vertical displacement mechanism may include a plurality of motion control arrangements, each including an upper motion control member fastened to vertical motion assembly or the switch rail and a lower motion control member fastened to the driving assembly, wherein the upper and lower motion control members are configured to interact such that a linear switching motion of a driving assembly results in vertical switch motion of a vertical motion assembly or the switch rail, wherein the vertical displacement mechanism further includes a first set of load carrying blocks associated with the driving assembly and a second set of load carrying blocks associated with the vertical motion assembly or the switch rail, wherein the first and second set of load carrying blocks are facing each other in the vertical direction and in load-transmitting contact with each other when the switch rail is in the upper switch state, and wherein the first and second set of load carrying blocks are interleaved when the switch rail is in the lower switch state.

[0028] In some example embodiments, the vertical displacement mechanism may include a first set of load-carrying wedges associated with the driving assembly and a second set of load-carrying wedges associated with the vertical motion assembly or the switch rail, wherein the first and second sets of load-carrying wedges are configured such that a linear switching motion of the driving assembly results in vertical switch motion of a vertical motion assembly or the switch rail.

[0029] In some example embodiments, when the switch rail is in the lower switch state, the first set of load carrying blocks are in contact with a metal plate of vertical motion assembly or with the switch rail, and the second set of load carrying blocks are in contact with a metal plate of driving assembly.

[0030] In some example embodiments, the motion casing has a stationary base part with four side walls extending upwards from a bottom wall, and wherein the vertical motion assembly or switch rail has four corresponding side walls extending downwards and telescopically engaged on an outer side of the side walls associated with the bottom wall.

[0031] In some example embodiments, the maintenance space and the elongated space are separated by an intermediate wall that is part of the frame structure.

[0032] In some example embodiments, the maintenance space corresponds to the space below the maintenance cover, and the elongated space corresponds to the space below the switch rail.

[0033] In some example embodiments, the stationary stock rail is arranged for being fastened on a top surface of the first side wall of the frame structure.

[0034] In some example embodiments, the frame structure comprises a plurality of spaced apart stiffener plates welded to an outside of the first side wall and an upper side of the bottom plate for improved stability of the first side wall, wherein the stiffener plates in the elongated stock rail support region have a horizontal upper surface configured for receiving the stationary stock rail.

[0035] In some example embodiments, at least some, specifically all, of the stiffener plates in the elongated stock rail support region have a thoroughgoing or blind hole configured for receiving a threaded fastener for fastening the stationary stock rail to the frame structure.

[0036] In some example embodiments, the vertical motion assembly of the motion casing has a plurality of thoroughgoing or blind holes configured for receiving a threaded fastener for fastening the switch rail to the vertical motion assembly.

[0037] In some example embodiments, the frame structure comprises a plurality of spaced apart stiffener plates welded to an outside of the second side wall and an upper side of the bottom plate for improved stability of the second side wall.

[0038] In some example embodiments, an upper surface of the switch rail is substantially flush with an upper surface of second side wall when the switch rail is arranged in the upper switch state.

[0039] In some example embodiments, a longitudinal length of each of the first and second switch units is in the range of 1.5 - 4 metres, specifically in the range of 2 - 3 metres, and wherein a vertical height of each of the first and second switch units is in the range of 0.2 - 0.5 metres, specifically in the range of 0.25 - 0.4 metres.

[0040] In some example embodiments, a ratio between a longitudinal length and a maximal height of each of the first and second switch units is in the range of 4 - 15, specifically in the range of 5 - 9.

[0041] In some example embodiments, the elongated bottom wall of the frame structure is made in one piece and a lateral length of the bottom wall is in the range of 1.5 - 3 times larger, specifically in the range of 1.75 - 2.5 times larger, than a vertical length of the second side wall of the frame structure.

[0042] In some example embodiments, a ratio between a length of the stationary stock rail in the lateral direction and a height of the stationary stock rail in the vertical direction is more than 0.75, specifically more than 1.0. Thereby, good tilt stability of the stationary stock rail is provided and the ratio enables direct attachment to frame by means of threaded members.

[0043] In some example embodiments, each of the first and second switch units is configured to be embedded in surrounding fill material, possibly including a top layer of pavement material, such as for example asphalt, cement, concrete, up to a vertical height corresponding to the height of a top surface of the stationary stock rail and/or height of a top surface of switch rail in the upper switch state. Thereby, a flush installation of the railway switch assembly is accomplished.

[0044] In some example embodiments, a stationary base part of the motion casing is partly filled with a lubricant fluid and/or is provided with a friction reducing sliding surface for reducing sliding resistance associated with linear switching motion of a driving assembly relative to the base part.

[0045] In some example embodiments, the frame structure has at least one elongated heating channel or duct arranged for removably holding an elongated heating device, in particular an electrical resistance heating cable or a tube for circulating a heat transfer medium.

[0046] In some example embodiments, an opening of the at least one elongated heating channel or duct, for enabling insertion and/or removal of an elongated heating device within the at least one elongated heating channel or duct, is located in the maintenance space.

[0047] In some example embodiments, the frame structure has at least one elongated heating channel or duct integrated and/or fastened to one or both of the first and second elongated side walls and/or to the bottom wall.

[0048] Further features and advantages of the invention will become apparent when studying the appended claims and the following description. The skilled person in the art realizes that different features of the present disclosure may be combined to create embodiments other than those explicitly described hereinabove and below, without departing from the scope of the present disclosure.

BRIEF DESCRIPTION OF DRAWINGS

[0049] The disclosure will be described in detail in the following, with reference to the attached drawings, in which

Fig. 1

shows schematically a top view of a railway switch assembly according to the disclosure in installed state,

Fig. 2

shows schematically a top-view of the first and second switch units,

Fig. 3

shows schematically a perspective view of the first and second switch units of the disclosure in installed state,

Fig. 4A-4B

show schematically a cross-section of the first switch units in upper and lower switch state, respectively,

Fig. 5

shows schematically a perspective view of the switch assembly in installed state without surrounding fill material,

Fig. 6-7

show schematically two different perspective views of the first and second frame structures,

Fig. 8

shows schematically a cross-section of the maintenance space of a switch unit,

Fig. 9-10

show schematically details of the rear and front end plates of the frame structure,

Fig. 11-12

show schematically the maintenance cover and maintenance space with cover removed, respectively,

Fig. 13

shows schematically the maintenance space with driving actuator,

Fig. 14

shows schematically details of the removable attachment of the motion casing,

Fig. 15-16

show details of the motion casing,

Fig. 17A-18B

show schematically a first example embodiment of the vertical displacement mechanism,

Fig. 19-20

show schematically alternative designs for mounting the motion casing and for placement of the driving actuator,

Fig. 21-25

show schematically various design possibilities relating to the vertical displacement mechanism,

Fig. 26A-30

show schematically cross-sections of the switch unit according to various example embodiments,

Fig. 31

shows schematically a cross-section of an installed railway switch assembly, and

Fig. 32-33

show schematically the main steps of a method for providing a railway switch assembly according to the disclosure, and a method for removing an elongated motion casing from a first switch unit of a railway switch assembly according to the disclosure.

DESCRIPTION OF EXAMPLE EMBODIMENTS

[0050] Various aspects of the disclosure will hereinafter be described in conjunction with the appended drawings to illustrate and not to limit the disclosure, wherein like designations denote like elements, and variations of the described aspects are not restricted to the specifically shown embodiments, but are applicable on other variations of the disclosure.

[0051] Figures 1 - 3, 4A-4B and 5 - 7 schematically shows different views and sections of a railway switch assembly 1 according to a first example embodiment of the disclosure. In particular, figure 1 shows a schematic top view of the switch assembly 1 including switch rails and stock rails, figure 2 shows a schematic top view of the switch assembly with some more details, figure 3 schematically shows a three-dimensional view of the switch assembly 1 in a ready to use state, and figures 4a and 4b shows a cross-section through a switch unit of the switch assembly 1 in an upper switch state and a lower switch state, respectively. Moreover, figure 5 schematically shows a three-dimensional view of the railway switch assembly 1 mounted on an underlying support structure 4, figure 6 schematically shows a three-dimensional view of a frame structure of the railway switch assembly 1 mounted on the underlying support structure 4, and figure 7 schematically shows the frame structure again but from a different point of view.

[0052] The railway switch assembly 1 comprises a first switch unit 11 configured for controlling switching movement of a first switch rail 21 and a second switch unit 12 configured for controlling switching movement of a second switch rail 22. The first switch unit 11 includes a first rigid elongated metal frame structure 31 defining a longitudinal direction LO and a lateral direction LA and configured for being fastened to an underlying support structure 4. Similarly, the second switch unit 12 includes a second rigid elongated metal frame structure 32 defining a longitudinal direction LO and a lateral direction LA and configured for being fastened to an underlying support structure 4. The longitudinal direction LO and lateral direction LA of the first and second frame structures, 31, 32 respectively, are for example substantially identical or simply the same. The underlying support structure 4 may for example be a common plate made of concrete or the like.

[0053] The first frame structure 31 has an elongated bottom wall 5 and first and second elongated side walls 6, 7 jointly defining an elongated space 8, and an elongated stock rail support region 9 located next to the elongated space 8 and arranged for receiving a first stationary stock rail 41.

[0054] Similarly, the second frame structure 32 has an elongated bottom wall 5 and first and second elongated side walls 6, 7 jointly defining an elongated space 8, and an elongated stock rail support region 9 located next to the elongated space 8 and arranged for receiving a second stationary stock rail 42.

[0055] The first switch unit 11 further includes a first elongated motion casing 51 arrangeable in the elongated space 8, and the second switch unit 12 further includes a second elongated motion casing 52 arrangeable in the elongated space 8.

[0056] Each of the first and second motion casings 51, 52 holds a vertical displacement mechanism that is arranged to translate a linear switching motion of a driving assembly 14 to a vertical switch motion of a vertical motion assembly 15 or the associated first or second switch rail 21, 22. The driving assembly 14 is arranged to be displaced in a direction substantially parallel to a longitudinal direction of the switch rail 21, 22 or substantially parallel with a longitudinal direction of the switch unit 11, 12.

[0057] The first switch unit 11 further includes a driving actuator 13 fastenable to the first frame structure 31 and operatively connectable with the driving assembly 14 for controlling displacement of the driving assembly 14, and the second switch unit 12 further includes a driving actuator 13 fastenable to the second frame structure 32 and operatively connectable with the driving assembly 14 for controlling displacement of the driving assembly 14.

[0058] The first switch unit 11 includes a first switch rail 21 attachable to a top side of the first motion casing 51, and the second switch unit 12 includes a second switch rail 22 attachable to a top side of the second motion casing 52.

[0059] Each of the first and second switch rail 21, 22 is vertically displaceable by means of the associated vertical displacement mechanism for enabling a vertical switch movement of the switch rail 21, 22 between an upper and lower switch state.

[0060] In addition, the first switch unit 11 includes a first stationary first stock rail 41 fastenable to the elongated stock rail support region 9 of the first frame structure 31, and the second switch unit 12 includes a second stationary stock rail 42 fastenable to the elongated stock rail support region 9 of the associated frame structure 31, 32.

[0061] With reference to figure 1, the railway switch assembly 1 may thus according to some example embodiments be implemented for right turnout, i.e. a switch that selectively controls a rail vehicle to travel either straight forwards, or depart to the right on a new track. In such an implementation, the railway switch assembly 1 typically comprise a first, left, switch unit 11 configured for controlling switching movement of a first switch rail 21 associated with a curved closure rail 16 and a second, right, switch unit 12 configured for controlling switching movement of a second switch rail 22 associated with a straight closure rail 17.

[0062] Consequently, when the railway switch assembly 1 is controlling a rail vehicle traveling along a direction indicated by arrow 18 in figure 1 to continue straight forwards in figure 1, the first switch unit 11 is controlled to lower the first switch rail 21 or keep it low, while the second switch unit 12 is controlled to raise the second switch rail 22 or keep it raised, as depicted in figure 3. Thereby, the steering flange of the right side wheel of the rail vehicle will be controlled by the second switch rail 22 to pass over to the straight closure rail 17, while the steering flange of the left side wheel of the rail vehicle will be allowed to pass over the lowered first switch rail 21 and continue straight forwards on the straight stock rail 19.

[0063] On the other hand, when the railway switch assembly 1 is controlling a rail vehicle traveling along a direction indicated by arrow 18 in figure 1 to depart to the right in the switch, the first switch unit 11 is controlled to vertically raise the first switch rail 21 or keep it raised, while the second switch unit 12 is controlled to vertically lower the second switch rail 22 or keep it lowered. Thereby, the steering flange of the left side wheel of the rail vehicle will be controlled by the first switch rail 21 to pass over to the curved closure rail 16, while the steering flange of the right side wheel of the rail vehicle will be allowed to pass over the lowered second switch rail 22 and continue along the curved stock rail 20.

[0064] Each of the first and second switch units 11, 12 may thus be deemed including three main sections or areas, when viewed from above, as shown for example in figure 2, namely a first elongated section 25 corresponding the first and second switch rails 21, 22, respectively, and second section 26 corresponding to a maintenance space 29 for enabling for example installation and removal of the associated motion casing 51, 52, and third section 27 corresponding to the associated stationary stock rail 41, 42.

[0065] With reference again to in particular figures 6 and 7, each of the first and second rigid elongated stationary metal frame structures 31, 32 may be an individual member that may be manufactured, transported and installed separately, thereby enabling a modular and compact design of each frame structure 31, 32. The first and second switch units 11, 12 may however be interconnected by a plurality of rigid lateral distance keepers 10, each of which may be fastened to the first and second frame structures 31, 32. The rigid lateral distance keepers 10 primarily serves to ensure correct lateral distance between the first and second frame structures 31, 32. The ends of these rigid lateral distance keepers 10 may for example be welded or clamped to the first and second frame structures 31, 32 in connection with installation and fastening of the first and second frame structures 31, 32 on the installation site.

[0066] By having each of the first and second frame structures 31, 32 being made of elongated rectangular steel bottom wall 5 configured for being positioned flat onto an underlying support structure 4, such as a flat concrete plate, and a first and second elongated rectangular steel side walls 6, 7 welded thereto perpendicular to the plane of the bottom wall, a very compact and robust frame structure is accomplished that enables a low overall height of the first and second switch units 11, 12.

[0067] Moreover, with reference to figure 9 and 10, which show magnifications of the longitudinal ends of the second frame structure 32 of figure 7, a first end plate 23 and second end plate 24 made of steel may be attached to the bottom wall 5 and the first and second side walls 6, 7 for closing a large elongated cavity defined by the first and second side walls 5, 6 and first and second end walls and bottom wall.

[0068] An intermediate wall 28 may be located within said large elongated cavity. The intermediate wall 28 may separate the cavity into the maintenance space 29 and the elongated space 8. Alternatively, the maintenance space 29 corresponds to the space below the maintenance cover 37 and the elongated space 8 corresponds to the space below the switch rail 21, 22. Still more alternatively, the maintenance space 29 corresponds to the space outside of the motion casing 51, 52 and the elongated space 8 corresponds to the space of the motion casing 51, 52.

[0069] The intermediate wall 28 may for example be welded to the first and second side wall 6, 7, and possibly also the bottom wall 5.

[0070] As illustrated for example in figure 3 and figure 5, an upper surface of each of the first and second switch rails 21, 22 may be arranged to be substantially flush with an upper surface of second side wall 7, and possibly also with an upper surface of the first and second end walls 23, 24, when the associated switch rail 21, 22 is arranged in the upper switch state. Thereby, a smooth and flat pedestrian surface may be accomplished in the area of the switch assembly, and the second side wall 7 and first and second end walls 23, 24 also provides protection for preventing dirt and water entering into the elongated space 8 and/or the maintenance space 29.

[0071] Consequently, each of the first and second switch units 11, 12 is configured to be embedded in surrounding fill material, possibly including a top layer of pavement material, such as asphalt, cement, concrete, or the like, up to a vertical height corresponding to the height of the top surface of the first and second stationary stock rail 41, 42 and/or the height of a top surface of first and second switch rail 21, 22 in the upper switch state.

[0072] However, the first and second end walls 23, 24 may be provided with cut-outs 30 in the top surface for enabling connection of the associated stationary stock rail 41, 42 to the straight and curved stock rails 19, 20, respectively, as well as connection of the associated switch rail 21, 22 to the curved and straight closure rails 16, 17, respectively.

[0073] For even further improving the strength, rigidity and compactness, each of the first and second frame structures 31, 32 may comprise a plurality of spaced apart first stiffener plates 33 welded to an outside of the first side wall 6 and an upper side of the bottom plate 5, as showed for example in the example embodiment of figures 6-7 and 9-10. The first stiffener plates 33, also referred to as first corner stiffening plates or first stiffening angle plates, typically have a planar shape and may be cut from a metal plate. The first planar stiffener plates 33 are typically arranged in a vertical plane that is parallel with the longitudinal direction LO.

[0074] The first stiffener plates 33 may have a substantially triangular shape, in particular a right-angled triangular shape, for enabling welding of the right-angle sides of the tringle to the bottom wall 5 and first side wall 6, respectively. However, in the example embodiment of the first and second frame structure 31, 32 described with reference to figures 6-7 and 9-10, the first stiffener plates 33 have a more rectangular shape instead, with a lower side being welded to the bottom wall 5 of the frame structure 31, 32, with a lateral side being welded to an exterior surface of the first wall 6, and with a top side providing a flat and horizontal support surface for supporting and carrying the associated stationary stock rail 41, 42. Consequently, the first stiffener plates 33 are located in the elongated stock rail support region and are configured for receiving and carrying part of the associated stationary stock rail 41, 42.

[0075] Similarly, for even further improving the strength, rigidity and compactness, each of the first and second frame structures 31, 32 may comprise a plurality of spaced apart second stiffener plates 34 welded to an outside of the second side wall 7 and the upper side of the bottom plate 5 for improved stability of the second side wall 7, as showed for example in the example embodiment of figures 5-7 and 9-10. The second stiffener plates 34 typically have a planar shape and may be cut from a metal plate.

[0076] The second planar stiffener plates 34 are typically arranged in a vertical plane that is parallel with the longitudinal direction LO.

[0077] The second stiffener plates 34 may have a substantially triangular shape, in particular a right-angled triangular shape, for enabling welding of the right-angle sides of the tringle to the bottom wall 5 and second side wall 7, respectively.

[0078] As mentioned above, the elongated bottom wall 5 and the first and second elongated side walls 6, 7 of each of the first and second the frame structure 31, 32 jointly defines a maintenance space 29. In the example embodiment of 4a and 4b, and in the example embodiment of figures 8 and 11 - 12, a driving actuator 13 is fastened within the maintenance space 29 of each switch unit 11, 12. This has the advantage of enabling simple and cost-efficient maintenance work in the railway switch assembly, because the maintenance space 29 is easily accessible via a dedicated maintenance cover 37, i.e. a lid.

[0079] In figure 8, which shows a perspective side of the first switch unit 11, the second side wall is 7 removed for enabling a better view of the interior of the maintenance space 29, the intermediate wall 28 and the elongated space with the first motion casing 51.

[0080] Moreover, both figure 11 and 12 show a perspective side of the first switch unit 11, wherein figure 11 shows the first switch unit 11 with the maintenance cover 37 mounted over the maintenance space 29, and figure 12 shows the same view but with the maintenance cover 37 removed, thereby giving access to the interior of the maintenance space 29.

[0081] Hence, the maintenance space 29 may be closed in the vertical direction by means of a removable maintenance cover 37. This enables opening and service operation of for example the driving actuator 13 without removal of the first or second switch rails 21, 22, or the first and second stationary stock rail 41, 42, and with the first and second switch unit 11, 12 in an installed state, i.e. embedded in the ground.

[0082] As described above, each of the first and second switch units 11, 12 includes an individual elongated motion casing 51, 52 arrangeable in the elongated space 8. According to some example embodiments, each of the first and second elongated motion casings 51, 52 is removably attached to the first and second frame structure 51, 32, respectively. This has the advantage that the motion casings 51, 52 may be manufactured separately from the frame structure and subsequently merely installed within the elongated space 8 of each frame structure 51, 52 when suitable. Moreover, the removable motion casings 51, 52 may also more easily be removed for maintenance or replacement if needed, thereby simplifying and reducing overall cost for maintenance and increasing efficiency.

[0083] According to some example embodiments, installation of each of the first and second motion casings 51, 52 may performed by first lowering the motion casing 51, 52 into the elongated space 8 until at least a first longitudinal end 35 thereof, i.e. the end configured for being located remote from the intermediate wall 28, contacts the bottom of the elongated space 8. This position may be accomplished with the second longitudinal end 36 of the motion casing 51, 52 still being located slightly above the frame structure 31, 32, or in contact with the bottom of the elongated space 8, or somewhere there between.

[0084] Thereafter, the motion casing 51, 52 may be pushed horizontally towards the rear end plate 24 of the associated frame structure 31, 32 until the first end 35 of motion casing 51, 52 engages and vertically interlocks with a longitudinal end of the frame structure 31, 32 adjacent the rear end plate 24. Vertical interlock herein refers to a locking engagement that prevents the first longitudinal end 35 of the motion casing 51, 52 to move vertically relative to the frame structure 31, 32. Thereafter, the second longitudinal end 36 of the motion casing 51, 52 may be lowered, unless this was not already performed, such that the entire motion casing 51, 52 rests on the bottom of the elongated space 8. Vertical interlocking of the second longitudinal end 36 of the motion casing 51, 52 to the frame structure 31, 32 may subsequently be performed. In other words, according to some example embodiments, the motion casing 51, 52 may be connected to the associated frame structure 31, 32 merely at the longitudinal ends thereof.

[0085] Said vertical interlocking of the second longitudinal end 36 of the motion casing 51, 52 to the frame structure 31, 32 may advantageously be performed from the maintenance space 29, because thereby the motion casing 51, 52 may be fastened to, and removed from, the frame structure 31, 32 despite the frame structure being attached to the underlying support structure 4 and embedded in fill material up the top of the frame structure 31, 32.

[0086] According to some example embodiments, as schematically illustrated in figures 7-9, 13 - 14, and 17a and 18a, each motion casing 51, 52 has a first permanent projection or recess 38 arranged at the first longitudinal end region 35 thereof and second permanent projection or recess 39 arranged at a second longitudinal end region 36 thereof, wherein the associated frame structure 31, 32 has a corresponding permanent projection or recess 43 arranged at a first longitudinal end region of the elongated space 8, i.e. near the rear end plate 24, and an adjustable projection 40, such as for example a threaded fastener or the like, arranged at a second longitudinal end region of the elongated space 8, i.e. near the intermediate wall 28, wherein the motion casing 51, 52 is arranged to be installed in the elongated space 8 and secured to the associated frame structure 31, 32 by first moving the motion casing 51, 52 in the longitudinal direction LO until the first permanent projection or recess 38 of the motion casing 51, 52 becomes interlockingly engaged with the corresponding permanent projection or recess 43 of the frame structure 31, 32, and subsequently adjusting the adjustable projection 40 in the longitudinal direction LO for interlocking engagement with the second permanent projection or recess 39 of the motion casing 51, 52.

[0087] According to some example embodiments, as for example schematically illustrated in figures 7-9, 13 - 14, and 17a and 18a, each motion casing 51, 52 may have a base part with a bottom wall 44 and two lateral side walls 45 extending mainly in the lateral direction LA and two longitudinal side walls 45 extending mainly in the longitudinal direction, wherein the bottom wall 44 protrudes outwards relative to the two lateral side walls 45 in the longitudinal direction LO, as indicated by distance 46 in figure 14, thereby defining the first and second permanent projections 38, 39 arranged at the first and second longitudinal end regions 35, 36, respectively, for securing the motion casing 51, 52 to the frame structure 31, 32.

[0088] Figure 13 shows a perspective view of the maintenance space 29 with the maintenance cover 37 removed, and figure 14 shows a similar view but more from the side and with the second wall 7 of the frame structure 31, 32 omitted, wherein for example threaded members 40 are mounted in holes in the intermediate wall 28 and configured to engage a side wall 45 of the motion casing 51, 52 for pushing the motion casing 51, 52 in the longitudinal direction LO towards the rear end plate 24. The threaded members 40 may additional protrude above the bottom wall 44 of the motion casing for vertically securing the motion casing 51, 52 to the frame structure 31, 32.

[0089] Alternatively, according to some other example embodiments, each motion casing 51, 52 may be removably connected to the associated frame structure 31, 32 by providing the associated frame structure 31, 32 with grooves or notches in the longitudinal sides thereof, which grooves may extend, from a top side, vertically downwards, and thereafter turn to become horizontal, for example towards the rear end plate 24. Each motion casing 51, 52 may have corresponding protrusions at the longitudinal sides thereof, such as for example cylindrical protrusions, for example extending about 5 - 25 mm outwards, and adapted to side along said grooves. There may be for example two grooves/protrusions on each longitudinal side, adjacent the longitudinal ends, of the motion casing/elongated space. Removable installation of a motion casing 51, 52 in to an associated frame structure 31, 32 may then be performed by simply lowering the motion casing 51, 52 into the elongated space 8 while said protrusions are sliding along said grooves, and when the motion casing 51, 52 has come in contact with the bottom of the elongated space 8, the motion casing 51, 52 is displaced slightly, e.g. about 20 - 50 mm, in a longitudinal direction LO, for example toward the rear end plate 24, and finally fixed in this position, for example by means of threaded fasteners, thereby effectively locking the motion casing 51, 52 within the associated frame structure 31, 32.

[0090] According to still some other example embodiments, each motion casing 51, 52 may be removably connected to the associated frame structure 31, 32 along the longitudinal sides thereof, for example by inserting some type of elongated locking member along the longitudinal sides for vertical interlocking engagement between the longitudinal sides of each motion casing 51, 52 and the corresponding longitudinal sides of the associated frame structure 31, 32.

[0091] Each of the first and second frame structure 31, 32 may further be provided with at least one elongated heating channel or duct 47 arranged for removably holding an elongated heating device (not showed), such as for example an electrical resistance heating cable or a heating tube for circulating a heat transfer medium, such as water or a refrigerant or the like.

[0092] An electrical resistance heating cable operates by feeding an electrical current through a resistive material for generating heat. A heating tube for circulating a heat transfer medium operates for example by driving a compressor for compressing the heat transfer medium, which raises its temperature. The warm heat transfer medium (gas) is then allowed to circulate through the heating tube for heating the frame structure 31, 32, and the heat transfer medium returns to a liquid state. An expansion valve lowers the pressure of the refrigerant, which triggers evaporation, and an external evaporator extracts energy from a heat source such as ambient air, water, geothermal or solar energy, by forcing the liquid to transform into a gas.

[0093] According to some example embodiments, each frame structure 31, 32 has at least one elongated heating channel or duct 47 integrated and/or fastened to one or both of the first and second elongated side walls 6, 7 and/or to the bottom wall 5. For example, a frame structure 31, 32 with elongated heating channels 47 integrated in both of the first and second elongated side walls 6, 7 is illustrated in figures 7-9, 12, 13 ad 15. Specifically, figure 15 shows a perspective view of the elongated space 8 having the base part of the motion casing 51, 52 installed therein, and with the intermediate wall 28 omitted. A longitudinally extending groove 48 may for example be machines or otherwise provided in the first side wall 6, and a heating channel or duct 47 may be arranged within the groove 48 and adapted for receiving a heating device. The heating channel 47 may for example extend all the way to the rear end plate 24.

[0094] The heating channel 47 may be arranged to be substantially flush with the interior side of the first side wall 6, i.e. not protrude into the elongated space, for avoiding undesired interference between a moving part of the motion casing 51, 52.

[0095] As illustrated in figure 13, an opening of the at least one elongated heating channel 47 is located in the maintenance space 29 for enabling insertion and/or removal of an elongated heating device within the at least one elongated heating channel or duct 47, also while the frame structure 31, 32 is installed and embedded in fill material. In other words, if a heating device malfunctions, replacement of the heating device is performed by removing the maintenance cover 37, pulling out the heating device from the heating channel 47, inserting a new heating device in the heating channel 47 and connecting it to a heat/power source, and then reinstall the maintenance cover 37.

[0096] The opening of the heating channel 47 for enabling access to the heating channel 47 may extend over length of about 10 - 50 cm within the maintenance space 29 for simplifying insertion of an elongated heating cable or heating pipe into the heating channel 47.

[0097] In figure 13, a heating channel 47 is arranged in each of the first and second side walls 6, 7.

[0098] As indicated above, each of the first and second switch units 11, 12 may include a linear driving actuator 13 fastenable to the associated frame structure 31, 32 and operatively connectable with the driving assembly of the vertical displacement mechanism for controlling displacement of the driving assembly, and the vertical displacement mechanism is arranged to translate a linear switching motion of the driving assembly to a vertical switch motion of a vertical motion assembly or the switch rail.

[0099] Figures 17a and 17b schematically shows a cross-section of a switch unit 11, 12 in the area of the maintenance space 29, in the upper and lower switch state, respectively, and figure 18a and 18b shows corresponding cross-sections of a rear end of the switch unit 11, 12.

[0100] The linear driving actuator 13 may according to same example embodiments include an electrical machine having a rotatable rotor rotationally connected to a shaft 49, which may be threadingly engaged with a the driving assembly of the vertical displacement mechanism, such that rotation of the shaft 49 by means of the electrical machine generates longitudinal displacement of the driving assembly. Another type of linear actuator may alternatively be used, such as hydraulic or pneumatic cylinder/piston actuator, or electrical linear actuator.

[0101] According to some example embodiments, the driving assembly includes a metal plate 50 that is in contact with, and slidably arranged in the longitudinal direction LD relative to, the bottom wall 44 of the motion casing, and wherein the bottom wall 44 of the motion casing 51, 52 rests on and is in contact with the bottom wall 5 of the frame structure 31, 32.

[0102] Furthermore, the stationary base part of the motion casing 51, 52 may be partly filled with a lubricant fluid and/or may be provided with a friction reducing sliding surface for reducing sliding resistance associated with linear switching motion of the driving assembly relative to the base part, e.g. linear switching motion of the metal plate 50 of the driving assembly relative to the bottom wall 44 of the motion casing 51, 52.

[0103] The metal plate of the driving assembly may include, at a longitudinal end thereof, a part with internal threads 63 for engagement with the exterior threads of the shaft 49.

[0104] Since the driving actuator 13, such as an electric motor, of each switch unit 11, 12 is an individual part that may be controlled independently from each other, the driving assembly of motion casing 51, 52, may also be controlled independently from each other, thereby enabling independent and individual switch movement of each of the first and second switch rails 21, 22. As a result, both the first and second switch rails 21, 22 may be arranged in their upper switch state, as default, when no rail vehicle is near the railway switch assembly 1, thereby providing a smoother upper surface of the railway switch assembly 1, which may be desired when the railway switch assembly is located integrated in a city road that is also used be cars, buses, bicycles, pedestrians, etc. As soon as a rail vehicle is approaching the railway switch assembly 1, one of the first and second switch rails 21, 22 is temporarily lowered vertically for providing the desired switching.

[0105] Actuation of the driving actuator 13 in the example embodiment of figures 17A and 17B for moving the driving assembly from the position depicted in figure 17A to the position depicted in figure 17B results in a lowering motion of the associated switch rail 21, 22 in the vertical direction due to the vertical displacement mechanism, which is arranged to translate a linear switching motion of the driving assembly to a vertical switch motion of a vertical motion assembly or the switch rail.

[0106] In the example embodiment illustrated in figures 4B, 4B, 17A and 17B, the vertical displacement mechanism includes a plurality of linkage arms 53 that are pivotally connected to the driving assembly at a first pivot point 57 and the vertical motion assembly at a second pivot point 58, such that a linear longitudinal switching motion of a driving assembly results in vertical switch motion of a vertical motion assembly.

[0107] In particular, in the example embodiment of figures 4B, 4B, 17A and 17B, the vertical motion assembly can only move in the vertical direction, for example by because the motion casing has a stationary base part with four side walls 45 extending upwards from the bottom wall 44, and the vertical motion assembly or switch rail 21, 22 has four corresponding side walls 54 extending downwards and telescopically engaged on an outer side of the side walls 45 associated with the base part. Due to the stationary nature of the base part of the motion casing 51, 52 within the elongated space 8 in the longitudinal and lateral directions, the telescoped side walls 45, 54 results in a corresponding fixation of the vertical motion assembly, which thus may move only in the vertical direction V. In other words, the vertical motion assembly performs a rectilinear translatory motion in the vertical direction V, such that that both the first and second longitudinal end 35, 36 of the switch rail 21, 22 performs the same vertical motion.

[0108] Consequently, when the driving assembly moved from the position depicted in figure 17A towards the position depicted in figure 17B, the vertical motion assembly is first caused to displace vertically upwards due to the linkage arms 53 moving from an over centre position to a centre position, i.e. vertically aligned position, and thereafter caused to displace vertically downwards due to the linkage arms 53 moving from the centre position to an the position showed in figure 17B.

[0109] In the example embodiment of figures 4B, 4B, 17A and 17B, the vertical displacement mechanism further includes a first set of load carrying blocks 55 associated with the driving assembly and a second set of load carrying blocks 56 associated with the vertical motion assembly. The first and second set of load carrying blocks 55, 56 are facing each other in the vertical direction V and are arranged in load-transmitting contact with each other when the switch rail 21, 22 is in the upper switch state, as illustrated in figure 17A and 18A. On the other hand, the first and second set of load carrying blocks 55, 56 are interleaved when the switch rail 21, 22 is in the lower switch state, as depicted in figures 17B and 18B. This is accomplished by the longitudinal motion of the first set of load carrying blocks 55 during the switch motion.

[0110] Consequently, when the switch rail 21, 22 is in the lower switch state, the first set of load carrying blocks 55 are in contact with a metal plate 59 of vertical motion assembly or with the switch rail 21, 22, and the second set of load carrying blocks 56 are in contact with the metal plate 50 of driving assembly.

[0111] The first pivot points 57 may for example be arranged in the region of the first set of load carrying blocks 55, and the second pivot points 58 may for example be arranged in the region of the second set of load carrying blocks 56, because thereby the attachment of the linkage arms 53 is simplified due to the increased material thickness in the region of the load carrying blocks 55, 56.

[0112] Figure 19 shows an alternative example embodiment of the first and second switch units 11, 12, wherein the driving actuator 13 is mounted within the motion casing 51, 52 instead. In particular, the driving actuating 13 may be mounted to a longitudinal extension 44a of the bottom wall 44 of the motion casing 51, 52. This design may possibly reduce the need for connecting the driving actuator 13 with the driving assembly after installation of the motion casing 51, 52, or upon removal of the motion casing 51, 52. However, the driving actuator 13 is still mounted outside of the side walls 45 of the base part of motion casing 51, 52.

[0113] The intermediate wall 28 is in this example embodiment mounted in a region located between the driving actuator 13 and the front end plate of the frame structure 31, 32 and threaded members 40 are mounted in holes in the intermediate wall 28 and configured to engage a further side wall 62 of the motion casing 51, 52 for pushing the motion casing 51, 52 in the longitudinal direction LO towards the rear end plate 24. The threaded members 40 may additional protrude above the bottom wall extension 44a of the motion casing for vertically securing the motion casing 51, 52 to the frame structure 31, 32, as discussed above.

[0114] Figure 20 shows still a further alternative example embodiment of the first and second switch units 11, 12, wherein the driving actuator 13 is mounted within the motion casing 51, 52 and within the side walls 45 of the base part of the motion casing 51, 52. This design may possibly provide a more protected installation of the driving actuator 13, but also less simple to repair in case of malfunction. The fixation of the motion casing 51, 52 via a threaded members 40 extending through the intermediate wall 28 is similar to that described with reference to 17A-17B.

[0115] In the example embodiment showed in figures 17A, 17B, 18A and 18B, the vertical motion assembly may include the metal plate 59 carrying the second set of load carrying blocks 56, as well as a lid 60 including the side walls 54 of the vertical motion assembly. The switch rail 21, 22 is subsequently mounted to an upper side of said lid 60, for example by means of threaded fasteners 61. However, many alternative example embodiments are possible within the scope of the present disclosure.

[0116] For example, figure 21 schematically shows an alternative embodiment, in which the second load carrying blocks 56 are attached directly to, or integrated within, the lid 60 of the motion casing 51, 52.

[0117] Moreover, figure 22 schematically shows still a further alternative embodiment, in which the lid 60 also is omitted and the second load carrying blocks 56 are attached directly to, or integrated within, the switch rail 21. Moreover, the side walls 54 of the vertical motion assembly may then be fastened, or integrated within, the switch rail 21, 22.

[0118] Yet a further example embodiment is schematically illustrated in figure 23, in which the linkage arms 53 are replaced with a motion control arrangement 69 including a guide path 64 arranged in a guide path holder 65 connected to, or integrated in, the driving assembly, such as the metal plate 50 of the driving assembly. The motion control arrangement further incudes a guide member 66 arranged in a guide member holder 67 connected to, or integrated in, the vertical motion assembly, such as the metal plate 59 or the lid 60 of vertical motion assembly. The functionality of the lower and upper load carrying blocks 55, 56 are similar to the functioning of said blocks as described above with reference to figures 17A-17B.

[0119] In other words, the vertical displacement mechanism may include a plurality of motion control arrangements 69, each including an upper motion control member 67 fastened to vertical motion assembly or the switch rail 21, 22 and a lower motion control member 65 fastened to the driving assembly, wherein the upper and lower motion control members 67, 65 are configured to interact such that a linear longitudinal switching motion of a driving assembly results in vertical switch motion of a vertical motion assembly or the switch rail 21, 22, wherein the vertical displacement mechanism further includes a first set of load carrying blocks 55 associated with the driving assembly and a second set of load carrying blocks 56 associated with the vertical motion assembly or the switch rail 21, 22, wherein the first and second set of load carrying blocks 55, 56 are facing each other in the vertical direction and are in load-transmitting contact with each other when the switch rail 21, 22 is in the upper switch state, and wherein the first and second set of load carrying blocks 55, 56 are interleaved when the switch rail 21, 22 is in the lower switch state.

[0120] Moreover, the example embodiment of figure 23 also shows another type a drive actuator, such as a linear actuator having a piston rod 68 that is connected to the driving assembly, in particular to the metal plate 50 of the driving assembly.

[0121] Yet a further example embodiment is schematically illustrated in figure 24, which differs from the embodiment described with reference to 23 merely in that the lower and upper load carrying blocks 55, 56 are wedge-shaped, such that lifting of the switch rail 21, 22 is accomplished not only be means of the motion control arrangement 69, but also, or alternatively, due to the wedge-shaped lower and upper load carrying blocks 55, 56.

[0122] In other words, the vertical displacement mechanism may include a first set of load-carrying wedges 55 associated with the driving assembly and a second set of load-carrying wedges 56 associated with the vertical motion assembly or the switch rail 21, 22, wherein the first and second sets of load-carrying wedges 55, 56 are configured such that a linear longitudinal switching motion of the driving assembly results in vertical switch motion of a vertical motion assembly or the switch rail 21, 22.

[0123] In fact, in the example embodiment of figure 24, the motion control arrangement 69 is primarily arranged for lowering the switch rail 21, 22 when displacing the driving member in the longitudinal direction LD for shifting the switch rail 21 from the upper switch state to the lower switch state. If proper lowering can be provided by means of the wedge-shaped lower and upper load carrying blocks 55, 56, the motion control arrangement 69 can be omitted in the example embodiment of figure 24.

[0124] Finally, still a further example embodiment is schematically illustrated in figure 25, which differs from the embodiment described with reference to 24 in that the upper load carrying blocks 66 are integrally formed in the switch rail 21. Moreover, the side walls of vertical motion assembly 54 are integrally formed by, or attached to, the switch rail 21, thereby omitting the need or lid 60 and metal plate 59 of vertical motion assembly. Moreover, if necessary, a motion control arrangement 69 made of an upper wedge-shaped member 71 integrally formed with, or connected to, the metal plate of the driving assembly 50, and a lower wedge-shape member 72, integrally formed with, or connected to, the switch rail 21, may be included.

[0125] Figure 26A schematically shows a cross-section of the first switch unit 11 along cut A-A in figure 2 and with the first switch rail 21 in the upper switch state, and figure 26B shows a magnification of a detail of figure 26A. Furthermore, figure 27 schematically shows a cross-section of the first switch unit 11 along cut B-B in figure 2 and with the first switch rail 21 in the upper switch state, and figure 28 schematically shows a cross-section of the first switch unit 11 along cut A-A in figure 2 and with the first switch rail 21 in the lower switch state.

[0126] Clearly visible in figures 26A, 27 and 28 is the rigid elongated metal frame structure 31 including the horizontally arranged bottom wall 5 and first and second parallel and vertically arranged side walls 6, 7, which are standing on the bottom wall 5 and joined, in particularly welded, to the upper side 74 of the bottom wall 5. The bottom wall 5 and the first and second side walls 6, 7 jointly defines the elongated space 8 and the maintenance space 29.

[0127] Moreover, figures 26A, 27 and 28 also show how each of the plurality of spaced apart first stiffener plates 33 are joined to, in particular welded to, an outside surface 73 of the first side wall 6 and an upper side 74 of the bottom plate 5. The first stiffener plates 33 may have a rectangular shape for providing a horizontal support surface for the stationary stock rail 19.

[0128] In fact, said figures clearly illustrates the elongated stock rail support region 9 located next to the elongated space 8 and carrying a stationary straight stock rail 19. The first stationary stock rail 19 is thus fastened partly on a top surface of the first side wall 6 and partly on the top surface of a plurality of first stiffener plates 33.

[0129] For accomplishing the desired switching effect when raising and lowering the switch rail 21, 21, the inner side of elongate stock rail 19 facing in the lateral direction LA towards the switch rail 21, 22 is arranged aligned with an interior surface 79 of the first side wall 6, and the outer side of switch rail 21, 22 facing in the lateral direction LA towards the stock rail 19 is also arranged aligned with an interior surface 79 of the first side wall 6. Thereby, an interior flange of a conventional rail wheel 81 may enter a recess 81 of the switch rail 21, 22 for enabling the rail wheel 80 to follow the curved closure rail 16.

[0130] The stationary straight stock rail 19 include a rail wheel contact region 82 that is adapted and designed for supporting and contacting the rail wheels 80, and a fastening region 83 that is adapted to be used for securing the stock rail 19 to the frame structure 31, 32.

[0131] Figures 26A, 27 and 28 also show the arrangement of the plurality of spaced apart second stiffener plates 34 that are joined, in particularly welded to, an outside surface 75 of the second side wall 7 and the upper side surface 74 of the bottom plate 5 for improved stability of the second side wall 7. As shown in said figures, the second stiffener plates 34 may have a substantially triangular shape, in particular a right-angled triangular shape.

[0132] Consequently, the maximal width 76 of the frame structure 31 in the lateral direction LA is typically significantly larger than the outer width 77 between the first and second side walls 6, 7, as measured in the lateral direction LA, such as for example about 1.5 - 3 times larger.

[0133] In addition, the maximal width 76 of the frame structure 31 in the lateral direction LA is typically significantly larger than the maximal height 76 of the frame structure 31, as measured in the vertical direction V, such as for example about 1.5 - 3 times larger, specifically in the range of 1.75 - 2.5 times larger. Thereby, a good tilt stability of each switch unit 11, 12 is accomplished.

[0134] A longitudinal length of each of the first and second switch units 21, 22 may for example be in the range of 1.5 - 4 metres, specifically in the range of 2 - 3 metres, and a vertical height 78 of each of the first and second switch units 11, 12 may be in the range of 0.2 - 0.5 metres, specifically in the range of 0.25 - 0.4 metres.

[0135] Moreover, a ratio between a longitudinal length and a maximal height 78 of each of the first and second switch units 11, 12 may be in the range of 4 - 15, specifically in the range of 5 - 9.

[0136] In addition, a ratio between a length 90 of the stationary stock rail 19 in the lateral direction LA and a height 91 of the stationary stock rail 19 in the vertical direction V is more than 0.75, specifically more than 1.0. This provides good tilt stability of the stock rail 19 and enables direct attachment to frame structure 31, 32 by means of threaded members, or the like.

[0137] An elongated metal plate 2 may be provided at the outer side of each stock rail 19 for protecting the stock rail from fill material and/or asphalt or the like when embedding the switch unit in the ground.

[0138] The arrangement of the heating channels 47 within the first and second side walls 6, 7 is clearly visible in figures 26A, 27 and 28. By providing the groove 48 and heating channel 47 in the inner surface of the first and second walls 6, 7, access to the heating devices is provided via for example the maintenance space 29. This is particularly advantageous considering that the entire switch unit is intended to be embedded in fill material, as illustrated in figure 31, thereby making maintenance more problematic if access to the heating channels 47 was provided on an exterior side of the first and second walls 6, 7.

[0139] The first elongated motion casing 51 is arranged in the elongated space 8 and is removably attached to the first frame structure 31, and the first switch rail 21 is fastened to a top side of the motion casing 51. The first motion casing 51 has a base part with a bottom wall 44 and side walls 45 made of metal extending upwards from the bottom wall 44. A vertical displacement mechanism is arranged within the motion casing, wherein the vertical displacement mechanism includes the linkage arms 53, the driving assembly having the metal plate 50 controlled by means of the shaft 49, and the vertical motion assembly having the lid 60 with vertically extending side wall 54 and the metal plate 59.

[0140] The driving assembly is secured to the motion casing 51, in the vertical direction V, by means of a removable elongated locking members 84, that may be designed as square-bars, and that extends along a substantial length, such as at least 75%, specifically at least 90%, of the motion casing.

[0141] As shown in the magnification of figure 26B, each of the elongated, in particular square-shaped locking members 84 engages along said substantial length an upwards directed abutment surface 85 of the driving assembly and a downwards directed abutment surface 86 of the motion casing 51, in particular a side wall 45 of the motion casing. Thereby, the driving assembly is prevented from moving in the vertical direction V. Moreover, each of said locking members 84 may additionally engage a lateral abutment surface 87 of the driving assembly facing outwards and an oppositely lateral abutment surface 88 of the motion casing 51 facing inwards.

[0142] Installation of the elongated locking members 84 may be accomplished by providing a longitudinal side wall 45 of the base part with access openings 114, e.g. windows. Hence, manufacturing of a motion casing may for example be accomplished by first providing a base part of the motion casing and a corresponding lid 60, providing a driving assembly including a metal plate 50 having a first set of load carrying blocks 55, providing a vertical motion assembly including a metal plate 59 having a second set of load carrying blocks 56. Thereafter, the vertical motion assembly may be connected to the lid 60, for example via threaded fasteners, and subsequently connecting the driving assembly with the vertical motion assembly via linkage arms 53 or another type of motion transfer arrangement. Finally, installation of the resulting unit, which includes the driving assembly, the vertical motion assembly and the lid, into the base part may be accomplished by lowering said unit into the base part and subsequently inserting the elongated locking members 84 through the openings 114 in the side wall 45 for interlocking the metal plate 50 of the driving assembly with the base part, in particular the side walls 45, of the base part of the motion casing 51, 52. A opening cover 115 may subsequently be installed in the opening 114 for reducing the risk that contamination or dirt may enter the motion casing 51, 52, or that a fluid lubricant may leak from the motion casing.

[0143] Figure 16 schematically shows an end of the installed elongated locking members 84 through the openings 114 in the side wall 45 for interlocking the metal plate 50 of the driving assembly with the base part, in particular the side walls 45, of the base part of the motion casing 51, 52, and figure 15 shows the openings 114 being closed by opening covers 115.

[0144] For providing good lateral support from the frame structure, the interior dimension of the elongated space 8 in the lateral direction substantially matches, e.g. has a gap of about 1-10 mm, from the corresponding maximal exterior dimension of the motion casing. In addition, or separately, the interior dimension of the elongated space 7 in the longitudinal direction LO exceeds the corresponding maximal exterior dimension of the motion casing with about 5 - 100 mm for enabling simple installation and longitudinal fixation of the motion casing in the elongated space.

[0145] Figure 27 shows the same embodiment of the switch unit 11 as figure 26A, but at cross-section B-B instead, i.e. including the fasteners for fastening the first stock rail 19 to the first frame structure 31 and for fastening the first switch rail 21 to the underlying first motion casing 51. Other parts are the same as described with reference to figure 26A and will not be repeated here.

[0146] At least some, specifically all, of the first set of stiffener plates 33 arranged in the elongated stock rail support region have a thoroughgoing or blind holes 92 configured for receiving a fastener 93, in particular a threaded fastener, for fastening and/clamping the stationary stock rail 19 to the first frame structure 31. The holes 92 may for example have a vertical orientation.

[0147] Moreover, the stationary straight stock rail 19 may be provided with corresponding holes 70 in the fastening region 83 that is adapted to be used for securing the stock rail 19 to the frame structure 31. Hence, fastening of the stock rail 19 to the first frame structure 31 may be accomplished by first placing the stock rail on the first frame structure 31 and subsequently inserting a set of individual fasteners through the holes 70 of the stock rail 19 and engaging internal threads of the hole 92 in each of some of the first stiffener plates 33.

[0148] In addition, as shown in figure 27, the vertical motion assembly of the motion casing 51 may be provided with a plurality of thoroughgoing or blind holes 94, in particular threaded holes 94, which are configured for receiving a plurality of threaded fasteners 95 for fastening the first switch rail 21 to the vertical motion assembly. The holes 94 in the motion casing may for example be arranged in the lid 60 and/or the plate 59 of the vertical motion assembly. The holes 94 may for example have a vertical orientation.

[0149] The first switch rail 21 may be provided with corresponding holes 95 in a fastening region of the switch rail 21 that is adapted for securing the switch rail 21 to the motion casing 51. Fastening of the switch rail 21 to the first motion casing 51 may be accomplished by first placing the switch rail on a top side of the motion casing 51 and subsequently inserting a set of individual fasteners 61 through the holes of the switch rail 21 and engaging internal threads of the hole 94 in the vertical motion assembly of the motion casing 51.

[0150] The plate 59 of the vertical motion assembly may for example be bolted to the lid 60 of the motion casing 51 by means of threaded fasteners 96, or oppositely.

[0151] Figure 28 shows the same embodiment of the switch unit 11 as figure 26A, but here with the first switch unit 11 in the lower switch state. Reference is made to figure 26A for details and will not be repeated here. As can be seen in figure 28, the interior flange 89 of the rail wheel 80 will pass over the switch rail 21 without engaging it, thereby enabling the rail wheel 80 to follow the straight stock rail 19.

[0152] Figure 29 shows an embodiment of the switch unit 11 similar to described with reference to figure 27, but with a more conventional design of the stock rail 19. The other parts remain largely unchanged and reference is made to figure 27 for common details and will not be repeated here.

[0153] The stock rail 19 may have a wheel contact portion 97 at the top of the rail 19, an intermediate web region 98, and a foot 99 at the lower region of the rail 19. The wheel contact portion 97 includes a certain wheel contact region 82. The web region is typically relatively narrow and thin compared with wheel contact portion 97 and foot 99. The foot 99 on the other hand is relatively wide in the lateral direction LA for providing good support and protection against tilt movement of the stock rail 19.

[0154] The stock rail 19 may be arranged partly on the first side wall 6 and partly on the first stiffener plates 33. The foot may be provided with holes 70 adapted to be used for securing the stock rail 19 to the frame structure 31, similar to the design of figure 27. However, a clamping member 100 may alternatively be used for clamping and securing the stock rail 19 to the frame structure 31, in case no integrated holes 70 are available in the foot 99.

[0155] One individual clamping member 100 may be provided at each stiffener plate 33, or every second stiffener plate 33, or the like. Each clamping member 100 may have a hole 101 for receiving a fastener 93, a first clamping portion 102 arranged for contacting and abutting an upper support surface of the first stiffener plates 33, and a second clamping portion 103 arranged for contacting and abutting the foot 99 and/or at least part of the web region 98.

[0156] If the foot 99 lacks an attachment hole 70 the first side wall 6 may form or define a lateral motion barrier that prevents the stock rail 19 from displacing in the lateral direction LA towards the motion casing 51. For example, the foot may have a recess in the corner region, which recess engages an upwards protruding part 104 of the first side wall 6, or the entire side wall 6, or the like. Similarly, the first stiffener plates 33 may have a corresponding upwards protruding portion 105 that stops the foot 99 from moving in the opposite lateral direction LA.

[0157] Hence, fastening of the stock rail 19 to the first frame structure 31 may be accomplished by first placing the stock rail on the first frame structure 31 and subsequently inserting a set of individual fasteners through the holes 70 of the stock rail 19 and engaging internal threads of the hole 92 in each of some of the first stiffener plates 33.

[0158] Figure 30 shows an embodiment of the switch unit 11 similar to described with reference to figure 27, but with hollow first and second side walls 6, 7. The other parts remain largely unchanged and reference is made to figure 27 for common details and will not be repeated here. As showed in figure 30, each of the first and second side walls 6, 7 include a hollow interior space 107 enclosed by lateral side walls and top and bottom side walls. The hollow first and second side walls may made in one piece, for example by longitudinally folding a flat steel plate into an hollow elongated member that is subsequently rolled into a rectangular hollow structural beam that may be used as first and second side walls 6, 7.

[0159] By using hollow first and/or second side walls 6, 7 the space for inserting the heating device, such as a heating cable or heating tube is simplified, and no groove or the like must be machined into the side surface of the side walls 6, 7. Access openings may be machined into the side walls 6, 7 of the maintenance space 29 for inserting heating channels 47 and/or heating devices into the hollow interior space 107 of the side walls 6, 7. Alternatively, the hollow first and/or second side walls 6, 7 may even themselves form a pipe for routing a heat exchanging liquid or a refrigerant, thereby possibly omitting the need for installing a pipe in said side walls 6, 7.

[0160] Figure 31 schematically shows a cross-section of an installation of the railway switch assembly according to the disclosure, for example similar to that illustrated in figure 3. The installation include an underlying support structure, such as flat concrete plate, and with first and second switch units 11, 12 fastened thereto, for example by means of threaded fasteners. In figure 31, both the first and second switch units 11, 12 are in their upper switch state. Fill material 108, such as gravel or the like, is filling the area surrounding the first and second switch units 11, 12 for providing a smooth and flat top surface 109 over the area of the railway switch assembly 1. A top layer 110 of asphalt or concrete or road bricks or similar road material may be provided if the railway switch assembly is installed in a road jointly used by others, such as cars, busses, bicycles or pedestrians. A top surface 109 of the fill material 108 or top layer 110 may be arranged substantially flush with a top surface of the first and second switch units 11, 12.

[0161] With reference to figure 32, the main steps of a method for providing a railway switch assembly according to the disclosure is illustrated. The railway switch assembly comprises a first switch unit 11 configured for controlling switching movement of a first switch rail 21 and a second switch unit 22 configured for controlling switching movement of a second switch rail 23. The method comprises, for each of the first and second switch units: a first step S10 of fastening a rigid elongated metal frame structure to a underlying support structure, wherein the metal frame structure has an elongated bottom wall and first and second elongated side walls jointly defining an elongated space, and an elongated stock rail support region located next to the elongated space and arranged for receiving a stationary stock rail. The method further comprises a second step S20 of installing an elongated motion casing in the elongated space, wherein the elongated motion casing has a vertical displacement mechanism that is arranged to translate a linear switching motion of a driving assembly to a vertical switch motion of a vertical motion assembly or the switch rail, wherein the driving assembly is arranged to be displaced in a direction substantially parallel to a longitudinal direction of the switch rail or substantially parallel with a longitudinal direction of the switch unit. The method further comprises a third step S30 of fastening a driving actuator to the frame structure and operatively connecting the driving actuator with the driving assembly for controlling displacement of the driving assembly. The method additionally comprises a fourth step S40 of attaching a switch rail to a top side of the motion casing, wherein the switch rail is vertically displaceable by means of the vertical displacement mechanism for enabling a vertical switch movement of the switch rail between an upper and lower switch state. Finally, the method further comprises a fifth step S50 of fastening a stationary stock rail to the elongated stock rail support region of the frame structure.

[0162] For also installing the railway switch assembly in a railway grid network, the following method step is additionally required: connecting, e.g. welding, the ends of the first stock rail 41 to the corresponding ends of the straight stock rails 19 at first connection points 110, connecting, e.g. welding, the ends of the second stock rail 42 to the corresponding ends of the curved stock rail 20 19 at second connection points 111, connecting, e.g. welding the end of the curved closure rail 16 to the first switch unit 11 at a third connection point 112 located adjacent a longitudinal end of the first switch rail 21, and connecting, e.g. welding the end of the straight closure rail 17 to the second switch unit 12 at a fourth connection point 113 located adjacent a longitudinal end of the second switch rail 22.

[0163] With reference to figure 33, the main steps of a method for removing an elongated motion casing from a first switch unit of a railway switch assembly according to the disclosure is illustrated, wherein the railway switch assembly comprises a first switch unit configured for controlling switching movement of a first switch rail and a second switch unit configured for controlling switching movement of a second switch rail. The method comprises a first step S100 of removing a removable maintenance cover from a stationary rigid elongated metal frame structure of the first switch unit, by at least partly lifting the maintenance cover in the vertical direction, for enabling access to a maintenance space located within the frame structure, wherein the metal frame structure is fastened to an underlying support structure and is made of an elongated bottom wall and first and second elongated side walls, which walls jointly define the maintenance space and a neighbouring elongated space, and wherein a stationary stock rail is located next to the elongated space and attached to an elongated stock rail support region of the metal frame structure. The method further comprises a second step S200 of detaching or unfastening a motion casing, which is located in the elongated space, from the metal frame structure and subsequently lifting and/or rotating the motion casing vertically upwards for removing the elongated motion casing from the first switch unit, wherein the elongated motion casing has a switch rail attached to a top side of the motion casing and a vertical displacement mechanism that is arranged to translate a linear switching motion of a driving assembly to a vertical switch motion of a vertical motion assembly or the switch rail, and wherein, in an installed state of the motion casing, the driving assembly is arranged to be displaced in a direction substantially parallel to a longitudinal direction of the switch rail or substantially parallel with a longitudinal direction of the first switch unit, and the switch rail is vertically displaceable by means of the vertical displacement mechanism for enabling a vertical switch movement of the switch rail between an upper and lower switch state.

[0164] An intermediate step S150 of disconnecting a driving actuator from a driving assembly of a vertical displacement mechanism of the elongated motion casing may additionally be performed, if necessary.

[0165] It will be appreciated that the above description is merely exemplary in nature and is not intended to limit the present disclosure, its application or uses. While specific examples have been described in the specification and illustrated in the drawings, it will be understood by those of ordinary skill in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the present disclosure as defined in the claims. Therefore, it is intended that the present disclosure not be limited to the particular examples illustrated by the drawings and described in the specification as the best mode presently contemplated for carrying out the teachings of the present disclosure, but that the scope of the present disclosure will include any embodiments falling within the foregoing description and the appended claims. Reference signs mentioned in the claims should not be seen as limiting the extent of the matter protected by the claims, and their sole function is to make claims easier to understand.

REFERENCE SIGNS

[0166] 

1:

railway switch assembly

2:

Metal plate of stock rail

4:

underlying support structure

5:

bottom wall

6:

first side wall

7:

second side wall

8:

elongated space

9:

stock rail support region

10:

lateral distance keepers

11:

first switch unit

12:

second switch unit

13:

Driving actuator

14:

Driving assembly

15:

Vertical motion assembly

16:

curved closure rail

17:

straight closure rail

18:

Driving direction

19:

straight stock rail

20:

curved stock rail

21:

first switch rail

22:

second switch rail

23:

front end plate

24:

rear end plate

25:

first section

26:

second section

27:

third section

28:

intermediate wall

29:

maintenance space

30:

cut-out

31:

first metal frame structure

32:

second metal frame structure

33:

first stiffener plates

34:

second stiffener plates

35:

first longitudinal end

36:

second longitudinal end

37:

maintenance cover

38:

first permanent projection

39:

second permanent projection

40:

adjustable projection

41:

first stationary stock rail

42:

second stationary stock rail

43:

corresponding projection

44:

bottom wall of base part

45:

side walls of base part

46:

Protruding distance

47:

Heating channel

48:

Groove

49:

shaft

50:

metal plate of driving assembly

51:

first motion casing

52:

second motion casing

53:

linkage arm

54:

side wall

55:

first load carrying block

56:

second load carrying block

57:

first pivot point

58:

second pivot point

59:

metal plate

60:

lid

61:

Threaded fasteners

62:

further side wall

63:

internal threads

64:

guide path

65:

guide path holder

66:

Guided member

67:

guide member holder

68:

piston rod

69:

motion control arrangement

70:

holes in stock rail

71:

upper wedge-shape member

72:

lower wedge-shape member

73:

outside surface of first side

74:

upper surface of bottom wall

75:

outside surface of second side

76:

maximal width of frame

77:

outer width of side walls

78:

maximal height of frame

79:

interior surface of first side wall

80:

rail wheel

81:

recess

82:

contact region

83:

fastening region

84:

locking members

85:

upwards abut surface

86:

downwards abut surface

87:

lateral abutment surface

88:

opposite lateral abut surface

89:

flange of wheel

90:

length of stock rai

91:

height of stock rail

92:

hole in first stiffener plate

93:

stock rail fastener

94:

holes in vertical motion casing

95:

holes in switch rail

96:

fastener vertical motion assembly

97:

wheel contact portion

98:

web region of stock rail

99:

foot of stock rail

100:

clamping member

101:

hole in clamping member

102:

first clamping portion

103:

second clamping portion

104:

upwards protruding portion

105:

upwards protruding portion

107:

threaded fastener

108:

Fill material

109:

Top surface

110:

first connection points

111:

second connection point

112:

third connection point

113:

Fourth connection point

114:

Openings

115:

Opening covers

Claims

1. A railway switch assembly comprising a first switch unit (11) configured for controlling switching movement of a first switch rail (21) and a second switch unit (12) configured for controlling switching movement of a second switch rail (22), wherein each of the first and second switch units (11, 12) includes:

a rigid elongated metal frame structure (31, 32) defining a longitudinal direction (LO) and a lateral direction (LA) and configured for being fastened to a underlying support structure (4), wherein the frame structure (31, 32) has an elongated bottom wall (5) and first and second elongated side walls (6, 7) jointly defining an elongated space (8), and an elongated stock rail support region (9) located next to the elongated space (8) and arranged for receiving a stationary stock rail (19, 20),

an elongated motion casing (51, 52) arrangeable in the elongated space (8), wherein the motion casing (51, 52) holds a vertical displacement mechanism that is arranged to translate a linear switching motion of a driving assembly (14) to a vertical switch motion of a vertical motion assembly (15) or the switch rail (21, 22), wherein the driving assembly (14) is arranged to be displaced in a direction substantially parallel to a longitudinal direction (LO) of the switch rail (21, 22) or substantially parallel with a longitudinal direction (LO) of the switch unit (11, 12),

a driving actuator (13) fastenable to the frame structure (31, 32) and operatively connectable with the driving assembly (14) for controlling displacement of the driving assembly (14),

a switch rail (21, 22) attachable to a top side of the motion casing (51, 52), wherein the switch rail (21, 22) is vertically displaceable by means of the vertical displacement mechanism for enabling a vertical switch movement of the switch rail (21, 22) between an upper and lower switch state, and

a stationary stock rail (19, 20) fastenable to the elongated stock rail support region (9) of the frame structure (31, 32).

2. The railway switch assembly according to claim 1, wherein the motion casing (51, 52) is removably attached to the frame structure (31, 32).

3. The railway switch assembly according to any of the preceding claims, wherein the motion casing (51, 52) has a first permanent projection (38) or recess arranged at a first longitudinal end region thereof and second permanent projection (39) or recess arranged at a second longitudinal end region thereof, wherein the frame structure has a permanent projection (43) or recess arranged at a first longitudinal end region of the elongated space and adjustable projection (40) arranged at a second longitudinal end region of the elongated space, wherein the motion casing (51, 52) is arranged to be installed in the elongated space (8) and secured to the frame structure (31, 32) by first moving the motion casing (51, 52) in the longitudinal direction until the first permanent projection (38) or recess of the motion casing becomes interlockingly engaged with the permanent projection (43) or recess of the frame structure, and subsequently adjusting the adjustable projection (40) for interlocking engagement with the second permanent projection (39) or recess of the motion casing (51, 52).

4. The railway switch assembly according to any of the preceding claims, wherein the elongated bottom wall (5) and the first and second elongated side walls (6, 7) of the frame structure further jointly defines a maintenance space (29), and wherein the driving actuator (13) is fastened to the frame structure (31, 32) within the maintenance space (29).

5. The railway switch assembly according to claim 4, wherein the maintenance space (29) is closed in the vertical direction by means of a removable maintenance cover (37).

6. The railway switch assembly according to any of the preceding claims, wherein the driving assembly (14) of the vertical displacement mechanism is secured to the motion casing (51, 52), in the vertical direction, by means of a removable elongated locking member (84) that extends along a substantial length of the motion casing (51, 52) and engages an upwards directed abutment surface of the driving assembly (14) and a downwards directed abutment surface of the motion casing (51, 52), in particular a side wall of the motion casing.

7. The railway switch assembly according to any of the preceding claims, wherein the motion casing (51, 52) has a stationary base part with four side walls (45) extending upwards from a bottom wall (44), and wherein the vertical motion assembly or switch rail has four corresponding side walls (54) extending downwards and telescopically engaged on an outer side of the side walls (45) associated with the bottom wall (44).

8. The railway switch assembly according to any of the preceding claims, wherein the stationary stock rail (19, 20) is arranged for being fastened on a top surface of the first side wall (6) of the frame structure (31, 32).

9. The railway switch assembly according to any of the preceding claims, wherein the frame structure (31, 32) comprises a plurality of spaced apart stiffener plates (33) welded to an outside of the first side wall (6) and an upper side of the bottom plate (5) for improved stability of the first side wall (6), wherein the stiffener plates (33) in the elongated stock rail support region have a horizontal upper surface configured for receiving the stationary stock rail (19, 20).

10. The railway switch assembly according to any of the preceding claims, wherein an upper surface of the switch rail (21, 22) is substantially flush with an upper surface of second side wall (7) when the switch rail (21, 22) is arranged in the upper switch state.

11. The railway switch assembly according to any of the preceding claims, wherein frame structure (31, 32) has at least one elongated heating channel (47) or duct arranged for removably holding an elongated heating device, in particular an electrical resistance heating cable or a tube for circulating a heat transfer medium (water, refrigerant).

12. The railway switch assembly according to claim 11, wherein an opening of the at least one elongated heating channel (47) or duct, for enabling insertion and/or removal of an elongated heating device within the at least one elongated heating channel or duct, is located in the maintenance space (29).

13. The railway switch assembly according to any of the preceding claims 11 - 12, wherein frame structure (31, 32) has at least one elongated heating channel or duct integrated and/or fastened to one or both of the first and second elongated side walls (6, 7) and/or to the bottom wall (5).

14. A method for providing a railway switch assembly comprising a first switch unit (11) configured for controlling switching movement of a first switch rail (21) and a second switch unit (12) configured for controlling switching movement of a second switch rail (22), wherein the method comprises, for each of the first and second switch units (11, 12):

fastening a rigid elongated metal frame structure (31, 32) to a underlying support structure (4), wherein the metal frame structure (31, 32) has an elongated bottom wall (5) and first and second elongated side walls (6, 7) jointly defining an elongated space (8), and an elongated stock rail support region (9) located next to the elongated space (8) and arranged for receiving a stationary stock rail (19, 20),

installing an elongated motion casing (51, 52) in the elongated space, wherein the elongated motion casing (51, 52) has a vertical displacement mechanism that is arranged to translate a linear switching motion of a driving assembly (14) to a vertical switch motion of a vertical motion assembly (15) or the switch rail (21, 22), wherein the driving assembly (14) is arranged to be displaced in a direction substantially parallel to a longitudinal direction of the switch rail (21, 22) or substantially parallel with a longitudinal direction of the switch unit (11, 12),

fastening a driving actuator (13) to the frame structure (31, 32) and operatively connecting the driving actuator (13) with the driving assembly (14) for controlling displacement of the driving assembly (14),

attaching a switch rail (21, 22) to a top side of the motion casing (51, 52), wherein the switch rail (21, 22) is vertically displaceable by means of the vertical displacement mechanism for enabling a vertical switch movement of the switch rail (21, 22) between an upper and lower switch state, and

fastening a stationary stock rail (19, 20) to the elongated stock rail support region (9) of the frame structure (31, 32).

15. A method for removing an elongated motion casing (51) from a first switch unit (11) of a railway switch assembly that comprises a first switch unit (11) configured for controlling switching movement of a first switch rail (21) and a second switch unit (12) configured for controlling switching movement of a second switch rail (22), the method comprises:

removing a removable maintenance cover (37) from a stationary rigid elongated metal frame structure (31) of the first switch unit (11) for enabling access to a maintenance space (29) located within the frame structure (31), wherein the metal frame structure (31) is fastened to an underlying support structure (4) and is made of an elongated bottom wall (5) and first and second elongated side walls (6, 7), which walls (5-7) jointly define the maintenance space (29) and a neighbouring elongated space (8), and wherein a stationary stock rail (19) is located next to the elongated space (8) and attached to an elongated stock rail support region (9) of the metal frame structure (31),

detaching or unfastening a motion casing (51), which is located in the elongated space (8), from the metal frame structure and subsequently lifting and/or rotating the motion casing (51) vertically upwards for removing the elongated motion casing from the first switch unit (11), wherein the elongated motion casing (51) has a switch rail (21) attached to a top side of the motion casing and a vertical displacement mechanism that is arranged to translate a linear switching motion of a driving assembly (14) to a vertical switch motion of a vertical motion assembly (15) or the switch rail (21), and wherein, in an installed state of the motion casing (51), the driving assembly (14) is arranged to be displaced in a direction substantially parallel to a longitudinal direction of the switch rail (21) or substantially parallel with a longitudinal direction of the first switch unit (11), and the switch rail (21) is vertically displaceable by means of the vertical displacement mechanism for enabling a vertical switch movement of the switch rail (21) between an upper and lower switch state.

Drawing