(19)
(11) EP 2 933 383 A1

(12) EUROPEAN PATENT APPLICATION

(43) Date of publication:
21.10.2015 Bulletin 2015/43

(21) Application number: 15001062.7

(22) Date of filing: 14.04.2015
(51) International Patent Classification (IPC): 
E02D 29/14(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME
Designated Validation States:
MA

(30) Priority: 15.04.2014 DK 201400216

(71) Applicant: Harde Staal ApS
9300 Sæby (DK)

(72) Inventor:
  • Harde, Poul
    DK-9300 Sæby (DK)

(74) Representative: Nielsen, Charlotte 
Tropa ApS Aagade 97
8370 Hadsten
8370 Hadsten (DK)

   


(54) Hinged cover assembly


(57) A cover assembly (2) comprising a frame (6) having a peripheral wall defining an access opening and a cover (4) rotatably mounted to the frame (6) by means of an attachable mounting assembly (34, 36) comprising a shaft member (36, 68) rotatably mounted in a hinge member (36, 70) having an enclosing portion (106) that at least partially encloses the shaft member (36, 68), wherein said hinge member (36, 70) is rotatably mounted in a cavity (118) provided in the frame member (6).




Description

Field of invention



[0001] The present invention generally relates to a hinge cover assembly, and more particularly to a hinged cover assembly for an underground installation, which requires supervision and service, for example manholes, wells for district heating, pump stations or sewage.

Background of the Invention



[0002] It is well known to use a cover assembly for wells and manholes in general. A cover assembly for a well or a manhole comprises a removable plate forming the lid over the opening of the well or the manhole. The object of the cover assembly is to prevent someone from falling in and to keep unauthorised persons out. A cover assembly is often made out of cast iron. Therefore, it may be quite heavy (it may weigh more than 50 kg).

[0003] In order to prevent unauthorized access to a cover assembly for an underground installation, a special key is normally required to open the cover assembly. While some cover assembly types can only be moved by manually handling the cover, other more sophisticated cover assembly types are rotatably mounted in order to ease the working process when opening and closing the cover assembly. Moreover, it is well known to apply a lift-assist mechanism formed as a gas-assisted or spring-assisted cylinder in order to assist the opening and closing process.

[0004] Since a typical cover assembly is produced by using a casting process, subsequent processing (e.g. grinding) is often needed. Subsequent processing may both be time consuming and increase the production costs. Further, the assembling of a prior cover assembly is often a rather complex process that includes use of screws, nuts or bolts that have to be tightened.

[0005] Therefore, it would be desirable to have a cover assembly that can be assembled in an easier and less complex manner. Consequently, it is an object of the present invention to provide a cover assembly that can be assembled in an easier and less complex manner than the prior art covers.

[0006] Further, a typical prior art hinged manhole cover assembly is constructed in a manner in which water and dirt has access to the rotating part of the hinge. This introduces the risk of corrosion and malfunction of the cover assembly.

[0007] Therefore, it would be beneficial to have a cover assembly in which the rotating part of the hinge is prevented from being exposed to water and dirt. Accordingly, it is an object of the present invention to provide a cover assembly in which the rotating part of the hinge is prevented from being exposed to water and dirt.

Summary of the invention



[0008] The object of the present invention can be achieved by a cover assembly as defined in claim 1. Preferred embodiments are defined in the dependent sub claims, explained in the following description and illustrated in the accompanying drawings.

[0009] The cover assembly according to the invention is a cover assembly comprising:
  • a frame having a peripheral wall defining an access opening;
  • a cover rotatably mounted to the frame by means of an attachable mounting assembly comprising a shaft member rotatably mounted in a hinge member having an enclosing portion that at least partially encloses the shaft member, wherein the hinge member is rotatably mounted in a cavity provided in the frame member in such a manner that the longitudinal axis of the shaft member is fixed in a predefined vertical position relative to the frame. Hereby, it is possible to provide a cover assembly that can be assembled in an easier and less complex manner than the prior art covers. Moreover, the hinge member is automatically provided in a correct position ensuring that the cover can be opened and closed properly.


[0010] Moreover, it is possible to provide a cover assembly in which the rotating part of the hinge is prevented from being exposed to water and dirt.

[0011] The cover assembly comprises a frame having a peripheral wall defining an access opening. The frame may have any suitable shape. The frame may e.g. be basically circular or rectangular and have an access opening having a basically circular or rectangular form. The frame may preferably be configured to be attached to the opening of a well or a manhole. The cover assembly is suitable for being used for underground installations including wells and manholes.

[0012] The cover assembly comprises a cover rotatably mounted to the frame by means of an attachable mounting assembly. It is preferred that the cover is rotatably mounted to the frame by means of an attachable mounting assembly that can be mounted without using tools for screwing screws, bolts, nuts or the like. Hereby, the complexity and duration of the mounting process can be reduced. The cover assembly according to the invention can be produced in cast iron without welding components together. The frame and the cover can be manufactured by two independent moulding processes. Hereafter, the parts can be assembled by means of the attachable mounting assembly.

[0013] It is an advantage that the parts do not need to be welded together, since welding is demanding when it comes to tolerances. Further, the welding process may cause irregularities that make it difficult or impossible to open or close the cover in a desirable way.

[0014] The mounting assembly comprises a shaft member rotatably mounted in a hinge member having an enclosing portion that at least partially encloses the shaft member. One or two brushings enclosing one or more portions of the shaft member may be a part of the enclosing portion. It may be an advantage that the shaft member is basically cylindrical and extends horizontally. Hereby, it is possible to provide a desirable opening and closing of the cover assembly.

[0015] The hinge member is rotatably mounted in a cavity provided in the frame member in such a manner that the longitudinal axis of the shaft member is fixed in a predefined vertical position. Hereby, the cavity and the region surrounding the cavity will protect the hinge member and the shaft member against water and dirt from above and furthermore, hinge member can easily be provided in the correct position so that the cover can be opened and closed properly.

[0016] The cover assembly according to the invention comprises an attachable mounting assembly. Hereby, it is possible to disassemble the cover and provide maintenance or service when needed.

[0017] In order to ease the opening and closing procedure, it may be advantageous that the mounting assembly is configured to rotate about a horizontally extending shaft member.

[0018] It may be an advantage that the mounting assembly comprises a first plate member and a second plate member angled relative to the first plate member. The mounting assembly may be provided as a one-piece body comprising a single plate member provided with a bending (e.g. an 80-degree bending).

[0019] It may be advantageous that the enclosing portion is provided at the end area of one of the plate members. It may be beneficial that the enclosing portion is formed as a through bore configured to at least partially enclose the shaft member. The enclosing portion may be completely enclosing, however, as an alternative, the enclosing portion may partially enclose the shaft member. The enclosing portion may e.g. comprise a cylindrical portion and/or a semi-cylindrical portion.

[0020] It may be an advantage that the angle between the first plate member and the second plate member is between 70 and 100 degrees, such as between 80 and 90 degrees. By providing an angle between the first plate member and the second plate member, it is possible to ensure that the cover is provided in a predefined and desirable angle (e.g. 100 degrees) relative to horizontal when the cover is opened to maximum extent.

[0021] By securing that the cover can be opened and maintained in a fixed angle (e.g. 100 degrees) relative to horizontal, the working conditions for service workers can be improved, since the following closing procedure is eased (the cover does not need to be rotated from a horizontal position).

[0022] It may be an advantage to provide the shaft member with one or two brushings. Hereby, the axial position of the shaft member can be maintained. It may be an advantage that a brushing is provided in each end portion of the shaft member. It may be beneficial to provide the mounting assembly with a support plate attached thereto by means of any suitable attachment means e.g. screws, bots or nuts.

[0023] It may be an advantage that the cover assembly comprises a mounting assembly provided in a mounting assembly housing. The mounting assembly housing may comprise a mounting assembly having a first plate member provided with an enclosing portion and a second plate member angled relative to the first plate member, a shaft member, brushings, support members and a support plate. It is preferred that the mounting assembly housing is detachably attached allowing for removal of the mounting assembly housing.

[0024] It may be an advantage that the cavity is configured to receive and maintain a shaft member or one or more brushings or bearings attached to the shaft member and that the cavity is provided at the lower side of a surface member of the frame. Hereby, it is possible to position the hinge member and the shaft member at the highest position possible. Accordingly, an optimum position for preventing water and dirt from above to get access to the hinge member and the shaft member can be achieved. The cavity may e.g. be basically semi-cylindrical or have a rectangular or triangular cross-section.

[0025] It is preferred that the outer surface of the enclosing portion of the hinge member constitutes a portion of a cylindrical surface, preferably a cylindrical surface that fits the basically semi-cylindrical cavity provided in the horizontal surface member of the frame. Hereby, a well-functioning and reliable joint can be provided.

[0026] It may be advantageous that the cover assembly comprises a support unit configured to support the shaft member or one or more brushings or bearings attached to the shaft member of the hinge member. Hereby, the shaft member or one or more brushings or bearings attached to the shaft member and thus the cover assembly can be assembled in an easy and fast manner.

[0027] It may be beneficial that the support unit comprises a first support member supporting a first portion of the shaft member or one or more brushings or bearings attached to the shaft member and a second support member supporting a second portion of the shaft member or one or more brushings or bearings attached to the shaft member. Hereby, it is possible to provide a support that is stable and makes it possible to adjust the orientation of the hinge member and the shaft member in order to allow for the best possible opening and closing condition.

[0028] It may be an advantage that the support unit is height-adjustable. Hereby, it is possible to adjust for casting inaccuracies, and thus secure that the shaft member extends horizontally and that the support unit bears against the shaft member or one or more brushings or bearings attached to the shaft member.

[0029] It may be advantageous that the support unit comprises an upper support member provided on a lower support member. Hereby, it is possible to displace the upper support unit relative to the lower support member in order to adjust the orientation of the shaft member for securing that the shaft member extends horizontally.

[0030] In a preferred embodiment according to the invention, the support unit comprises a first upper support member provided on a first lower support member and a second upper support member provided on a second lower support member.

[0031] This configuration makes it possible to displace the first upper support unit relative to the first lower support member and to displace the second upper support unit relative to the second lower support member. Accordingly, it is even easier to adjust the orientation of the shaft member in an optimum way.

[0032] It may be beneficial that the upper support member is provided with a sloped surface, and that the lower support member is provided with a corresponding sloping surface, wherein the sloped surface of the upper support member is bearing against the sloping surface of the lower support member, wherein the support unit is provided with means for adjusting the vertical position of the upper support member relative to the lower support member and maintaining the upper support member in a fixed position relative to the lower support member.

[0033] It may be advantageous that the means for adjusting the vertical position of the upper support member relative to the lower support member, and maintaining the upper support member in a fixed position relative to the lower support member, comprises a screw member screwed into a threaded bore extending through the lower support member and the upper support member, wherein the screw member is configured to adjust the vertical position of the upper support member by adjusting the horizontal position of the upper support member relative to the lower support member.

[0034] It may be an advantage that means for adjusting the vertical position of the upper support member relative to the lower support member and maintaining the upper support member in a fixed position relative to the lower support member comprises a support screw vertically spaced relative to the screw member, wherein the support screw extends through an additional through bore provided in the upper support member, preferably an additional through bore extending parallel to the other through bore, wherein the support screw bears against the lower support member and maintains a distance between the upper support member and the lower support member, when the support member extends further than through the additional through bore.
It may be an advantage that the screw member and/or the support screw extend basically horizontally.

[0035] The support member(s) may support the enclosing portion of the hinge member directly or indirectly.

[0036] It may be beneficial that the support member comprises two support legs configured to support the different portions of the enclosing portion. The support legs may support the mounting assembly directly.

[0037] It may be beneficial that a lift-assist mechanism is integrated in the cover, wherein the lift-assist mechanism comprises an inner tube and a pipe member, wherein the inner tube comprises a first member, and the pipe member comprises another member, wherein the lift-assist mechanism comprises means for fixing the first member to the second member. Hereby, it is possible to provide a cover assembly in which the first member and the second member can be fixed to each other so that the cover can be fixed in an open position.

[0038] The first element may be any suitable element that the second member can engage (be attached to). The first element may be a bore, a protrusion, an arm member, a screw or another suitable member. The second element may be any suitable element configured to be brought into engagement with the first element. The second member may e.g. be an arm member bore, a protrusion, an arm member, a screw or another suitable member. It is preferred that the first element and the second element fit each other and are configured to be brought into engagement. By way of example, the first element may be a protrusion, while the second element is an arm member, wherein the protrusion and the arm member are adapted to be brought into engagement.

[0039] It may be an advantage that a lift-assist mechanism is integrated in the cover, wherein the lift-assist mechanism comprises an inner tube and a pipe member, wherein the inner tube comprises an attachment member and the pipe member comprises an arm member, wherein the lift-assist mechanism comprises a means for fixing the attachment member to the arm member.

[0040] It may be beneficial that the lift-assist mechanism comprises an inner tube and a pipe member, wherein the diameter of the inner tube is smaller than the diameter of the pipe member, so that the inner tube can be displaced into the pipe member.

[0041] It may be preferred that the lift-assist mechanism is a gas-assisted or spring-assisted cylinder. A lift-assist mechanism formed as a gas-assisted or spring-assisted cylinder can provide a vertical directed force assisting the opening process. Hereby, the work load can be reduced significantly.

[0042] The lift-assist mechanism can be formed in several ways. It may be advantageous that the pipe member of the lift-assist mechanism comprises a spring. When the cover of the cover assembly is in a closed position, the inner tube will be displaced into the pipe member. In this configuration, the spring would be compressed. When the cover is opened, the inner tube will be displaced relative to the pipe member due to gravity. Accordingly, the spring will expand causing the cover to open. The cover may now be locked by means of the locking assembly of the cover assembly.

[0043] It may be advantageous that the lift-assist mechanism comprises an inner tube and a pipe member, wherein the inner tube is configured to be at least partially displaced into the pipe member, wherein an attachment member is provided at the inner tube, wherein a slot extending along the longitudinal axis of the pipe member is provided in such a manner that the attachment member can be displaced through said slot, wherein an arm is rotatably mounted on a mounting attached to the pipe member. Hereby, it is possible to provide a compact and user-friendly lift-assist mechanism, in which the attachment member can be displaced through said slot.

[0044] By providing an attachment member on the inner tube, it is possible to lock the cover assembly in an open configuration. A slot extending along the length of the pipe member allows for displacement of the attachment member. An arm member may be rotatably mounted on a bracket provided at the pipe member. The rotatably mounted arm member can be brought into engagement with the attachment member provided at the inner tube when the cover is open.

[0045] The cover is locked in the position when the arm member is brought into engagement with the attachment member. Accordingly, it will not be possible to open the cover until the arm member no longer engages the attachment member. Therefore, in order to unlock the lift-assist mechanism, it is necessary to rotate the arm member and release it from its engagement with the attachment member.

[0046] The slot in the pipe member may be provided as an opening extending along the length of the pipe member. It is preferred that the width of the slot is sufficiently large to allow for displacing the attachment member into the pipe member without coming into contact with the periphery of the slot.

[0047] By integrating the lift-assist mechanism in the cover, the working process is eased for the staff handling and using the cover assembly.

[0048] It may be an advantage that the cover comprises one or more reinforcement members. Hereby, the cover assembly can resist larger loads.

[0049] It may be beneficial that the cover comprises a lattice structure or grate structure e.g. comprising a plurality of plate structures extending parallel and perpendicular to each other, respectively.

[0050] It may be an advantage that the cover comprises at least one reinforcement member, and that a lift-assist mechanism extends through the at least one reinforcement member. The lift-assist mechanism may be integrated in the reinforcement member by providing an aperture in the reinforcement member and letting the lift-assist mechanism extend along the cover. Hereby, it is possible to provide a compact cover assembly, and furthermore the lift-assist mechanism will not take up much space (it will not protrude from the cover).

[0051] Moreover, it may be an advantage that the lift-assist mechanism does not restrict the access to the well or manhole. Hereby, an unrestricted access to the well or manhole can be achieved.

[0052] It may be advantageous that the cover comprises an insulation member provided under the cover.

[0053] It may be an advantage that the cover comprises at least one reinforcement member, wherein the lift-assist mechanism is mounted to be displaced through said at least one reinforcement member. Hereby, it is possible to provide a compact and user-friendly cover assembly.

[0054] It may be advantageous that the cover comprises a locking unit comprising:
  • a locking head member mounted on a locking arm by means of a bolt;
  • a locking member mounted on or integrated in the locking arm in such a manner that the locking member extends basically perpendicular to the locking arm, wherein a mounting preventing the locking member from being moved downwards is provided under the locking member. Hereby, it is possible to lock the cover and thus prevent unauthorized access.


[0055] The mounting may be configured to preventing the locking member from being rotated more that e.g. 60 degrees about the longitudinal axis of the locking arm.

[0056] The mounting may be attached to the frame or be an integrated portion of the frame.

[0057] A locking unit may be provided in several ways, however, it is preferred that it requires use of a special tool to lock and unlock the cover.

[0058] The locking head member may be provided in a recess provided in the cover in such a manner that a suitable tool can engage the locking head member. By rotating the tool, the locking head member will rotate. Accordingly, it is possible to lock or unlock the cover by rotating the locking unit.

[0059] The locking head member may have any suitable geometric shape allowing for engagement with the locking head member.

[0060] The mounting may be attached to the back of the cover and is configured to prevent the locking unit from falling into the well or manhole when the locking unit is not locked (brought into engagement). It may be preferred that the mounting has a shape that restricts the rotational range of motion of the locking unit. It may be an advantage that the locking unit may be rotated within a range of approximately 90 degrees by means of the mounting. Hereby, the mounting restricts at least a portion of the range of motion of the locking unit.

[0061] It may be beneficial that a recess is provided in the locking arm.

[0062] It may be beneficial to provide the locking unit with a safety member that makes it possible to unlock the locking member, even if the locking member does not rotate upon rotation of the locking head member, (e.g. if the locking head member is corroded or is fixed due to the presence of dirt) or if the tool is lost.

[0063] A safety member may be a recess (or another structure) provided in the locking member. The recess (or another structure) may be provided to engage with a standard tool such as a single-head wrench or a screw driver having a screwdriver tip e.g. of a blade-type for a slotted structure or a "Phillips-type". Accordingly, it is possible to use a standard tool to engage the safety member and hereby lock or unlock the cover of the cover assembly.

[0064] It may be beneficial that the enclosing portion of the hinge member and the shaft member is arranged in a position in which ingress of water from above is prevented. Hereby, the hinge member and the shaft member can be protected from water and dirt.

Description of the Drawings



[0065] The invention will become more fully understood from the detailed description given herein below. The accompanying drawings are given by way of illustration only, and thus, they are not limitative of the present invention. In the accompanying drawings:
Fig. 1 a)
shows a schematic view of a cover assembly according to the invention,
Fig. 1 b)
shows a close-up view of a sealing structure of the cover assembly shown in Fig. 1 a),
Fig. 1 c)
shows a schematic illustration of a cover assembly subject to a pressure force during flooding,
Fig. 2
shows a schematic illustration of a lift-assist mechanism according to the invention,
Fig. 3
shows a schematic illustration of a closed cover assembly according to the invention,
Fig. 4 a)
shows a schematic view of an attachable mounting assembly according to the invention seen from behind,
Fig. 4 b)
shows a schematic side view of the mounting assembly shown in Fig. 4 a),
Fig. 5 a)
shows a schematic cross-sectional view of a locking unit according to the invention,
Fig. 5 b)
shows three different views of a locking arm according to a locking unit according to the invention,
Fig. 6 a)
shows a schematic illustration of a closed cover assembly according to the invention,
Fig. 6 b)
shows a schematic illustration of the cover assembly shown in Fig. 6a) in a fixed but not fully opened configuration,
Fig. 6 c)
shows a schematic illustration of the cover assembly shown in Fig. 6a) and in Fig. 6 b) in a fully opened configuration,
Fig. 6 d)
shows a cross-sectional close-up view of a sealing member,
Fig. 7 a)
shows a mounting assembly housing of the invention,
Fig. 7 b)
shows another view of the mounting assembly housing shown in Fig. 7 a) and
Fig. 8
shows a side view of a mounting assembly housing of the invention.

Detailed description of the invention



[0066] Referring now in detail to the drawings for the purpose of illustrating preferred embodiments of the present invention, a cover assembly device according to the invention is illustrated in Fig. 1.

[0067] Fig. 1 a) illustrates a schematic view of a cover assembly 2 according to the invention. The cover assembly 2 comprises a stationary part and a rotating part. The rotating part comprises a cover 4 forming the lid over the opening of pipe 12 (of the well or manhole) on the top of which the cover assembly 2 is arranged.

[0068] The cover assembly 2 is configured to rotate the cover 4. An insulation material 30 is attached to the back of the cover 4. The insulation material 30 is provided in order to prevent condensation in the well/manhole when the temperature of the air in the well/manhole exceeds the temperature of the cover 4.

[0069] The stationary part of the cover assembly 2 comprises a frame 6. A sealing element 14 is provided in a peripheral recess extending along the inside of the frame 6. The sealing element 14 seals against dirt, filth, rain water and snow and prevent these elements from entering the well/manhole.

[0070] The frame 6 is adapted to be mounted at the distal end of the well/manhole. Therefore, a pipe 12 has been attached to the frame 6 at the portion at which the pipe 12 enters the well/manhole. A concrete block 10 surrounds the top portion of the pipe 12. The concrete block 10 reinforces the opening of the well/manhole and thus prevents it from being damaged.

[0071] A mounting assembly housing 8 is provided under the cover 4 and the top surface of the frame 6. The cover 4 is rotatably mounted to the frame 6 by means of the mounting assembly housing 8. As it will be disclosed in the following drawings, the mounting assembly housing 8 comprises a mounting assembly having a shaft member that the cover assembly 2 is configured to rotate about.

[0072] Fig. 1 b) illustrates a close-up view of the sealing element 14 extending along the peripheral recess provided in the inside of the frame 6. An even closer look of the sealing element 14 can be seen in Fig. 6 d).

[0073] Fig. 1 c) illustrates a schematic cross-sectional view of a closed cover assembly 2 according to the invention. Since the cover assembly 2 is closed and locked, it prevents unwanted opening of the cover assembly 2, for example in the case of raising liquid (e.g. water or sewage) 16 in the well/manhole in case of flooding. The lock mechanism according to the invention prevents opening of the cover assembly 2, even if a rising liquid level creates a force F against the cover assembly 2. Accordingly, the cover assembly 2 prevents leaking manhole covers 2.

[0074] Fig. 2 illustrates a schematic view of a lift-assist mechanism 82 according to the invention. The lift-assist mechanism 82 is configured to maintain the cover assembly 2 in a fixed open position and to provide lift-assistance and thus ease the opening and closing procedure.

[0075] The lift-assist mechanism 82 comprises a pipe member 28 and an inner tube 18 having a smaller diameter than the pipe member 28, so that the inner tube 18 is displaceable into the pipe member 28. A spring (not shown) may be provided in the pipe member 28 or in the inner tube 18. The pipe member 29 has a first end portion 29 and a second end portion 29', while the inner tube 18 comprises a first end portion 19 and a second end portion 19'. An attachment member 24 is attached to the end portion 19' of the inner tube 18.

[0076] The pipe member 28 is provided with a slot (not shown) extending along the length of the pipe member 28. The slot has a shape that allows the attachment member 24 to be displaced along the slot. A mounting 20 is attached to the end portion 29 of the pipe member 28. An arm member 22 is rotatably attached to the mounting 20 by means of a shaft 26, so that the arm member 22 can rotate about the shaft 26. By fixing the arm member 22 to the attachment member 24, the lift-assist mechanism 82 can be locked and maintained in a fixed position so that the cover assembly 2 can be locked and maintained in a fixed open configuration.

[0077] The inner tube 18 is displaced into the pipe member 28 when the cover assembly 2 is closed. The end portion 19' of the inner tube 18 will be provided close to the end portion 29' of the pipe member 28. The attachment member 24 will be located close to the end portion 29' of the pipe member 28 when the inner tube 18 is displaced into the pipe member 28.
Fig. 2 illustrates a configuration in which the arm member 22 engages the attachment member 24. Hereby, the pipe member 28 is fixed relative to the inner tube 18. This configuration will occur when the cover assembly is open.

[0078] In order to close the cover assembly, the arm member 22 is released from its engagement with the attachment member 24, the arm member 22 is rotated and the inner tube 18 is displace into the pipe member 28.

[0079] Fig. 3 illustrates a schematic illustration of a closed cover assembly 2 according to the invention. The cover assembly 2 is in a closed configuration and comprises a cover 4 having a periphery with a first end portion 98 and a second end portion 98' bearing against an inner support structure (of the frame 6) comprising a protrusion 40. A recess 80 that may be sealed with a sealing member is provided adjacent to the protrusion 40. A sealing member may prevent dirt, particles, rain and snow from having access through the closed cover assembly 2. The frame 6 is configured to be attached to an opening of a well or a manhole.

[0080] The cover 4 is rotatably mounted to a horizontal surface member 120 of a first portion 42 the frame 6. The opposite portion of the cover 4 bears against a second portion 43 of the frame 6. Reinforcement members 96 extend perpendicular to the back of the cover 4 in order to increase the compressive strength of the cover 4. The reinforcement members 96 form a lattice structure on the back of the cover 4. Due to this structure, the cover can resist large loads provided either from above or from below.

[0081] The cover 4 is attached to the horizontal surface member 120 of a first portion 42 of the frame 6 by means of a mounting assembly housing 62. The mounting assembly housing 62 makes it possible to open and close the cover 4, and keep the cover 4 is attached to the frame 6. The mounting assembly housing 62 comprises a hinge member 36 rotatably mounted about its shaft member 34. The first end of the hinge member 36 is attached to the cover 4 by means of fastening means (not shown), while the opposite end of the hinge member 36 encloses the shaft member 36 and is mounted in a corresponding structure provided in the horizontal surface member 120 of a first portion 42 of the frame 6 (this is shown in greater detail in Fig. 8). The mounting assembly housing 62 is supported by a support structure comprising a support member 76 supported by an underlying support plate 78.

[0082] In order to make it easier to open and close the cover 4, the cover 4 is provided with a lift-assist mechanism 82. The lift-assist mechanism 82 assists the opening and closing procedure and makes it possible to carry out the opening and closing procedure by means of less force. The lift-assist mechanism 82 moreover has a dampening effect preventing the risk of a sudden opening or closing of the cover 4.

[0083] The lift-assist mechanism 82 comprises an inner tube 18 and a pipe member 28. The inner tube 18 has a smaller diameter than the pipe member 28, and thus the inner tube can be displaced into the pipe member 28. An arm member 32 is attached to the inner tube 18. The arm member 32 is rotatably attached to a shaft member 38 in its distal end. The shaft member 38 is arranged in a recess provided in the support plate 78 attached to the first portion 42 of the frame 6. The cover 4 will be opened when the cover assembly 2 is opened. The arm member 32 will rotate about the longitudinal axis of the shaft member 38 during the opening process 4. At the same time, the inner tube 18 will be displaced relative to the pipe member 28.

[0084] The lift-assist mechanism 82 may be gas-assisted or spring-assisted. Accordingly, gas or a spring may be applied to provide a force assisting the opening and closing procedure. A lift-assist mechanism 82 formed as a gas-assisted or spring-assisted cylinder can provide a vertical directed force assisting the opening process. Hereby, the work load can be reduced significantly.

[0085] The lift-assist mechanism 82 extends through an opening (aperture or slot) provided in the reinforcement member 96. This way of integrating the lift-assist mechanism 82 in the cover 4 provides a compact and space-saving solution allowing an easier access to the well or manhole.

[0086] The cover 4 can be locked to keep unauthorised persons out. The cover assembly is provided with a locking unit 56. The locking unit 56 will be in engagement with a fixed support 86 when the cover 4 is locked. The locking unit 56 will be brought out of engagement with a fixed support 86 when the cover 4 is unlocked. A tool or key (not shown) is needed to unlock the locking unit 56. The tool or key is brought into engagement with the locking head member 46 of the locking unit 56. The locking member 52 of the locking unit 56 can be rotated by rotating the locking head member 46 by said tool or key. The cover 4 comprises a mounting 84 adapted to prevent vertical displacement of the locking member 52 in order to prevent the locking unit 56 from falling into the well/manhole. The mounting 84 prevents the locking member 52 from being rotated more than 90 degrees.

[0087] Fig. 4 a) illustrates a schematic view of an attachable mounting assembly 62 according to the invention seen from behind (and thus perpendicular to the longitudinal axis of the shaft member 68). Fig. 4 b) illustrates a schematic side view of the mounting assembly 62 shown in Fig. 4 a) (and thus parallel to the longitudinal axis of the shaft member 68). The mounting assembly 62 is attached to the frame 6 by means of a mounting 74 and to the cover 4 by means of bolts (not shown) or other suitable fastening means. Two brushings 64, 66 are arranged in a through bore 116 provided in the mounting assembly 62.

[0088] The mounting assembly 62 is configured to provide a detachable attachment of the cover 4 to the frame 6 allowing the cover 4 to be opened and closed. The mounting assembly 62 comprises a hinge member 70, a shaft member 68, a through bore 100, two (equally shaped) support members 76, 76' a support plate 78 and two brushings 64, 6,6. The hinge member 70 comprises a first plate member 102 and a second plate member 104 provided with an enclosing portion 106 enclosing the cylindrical shaft member 68. The first plate member 102 and a second plate member 104 are angled approximately 80 degrees relative to each other. The first plate member 102 and a second plate member 104 are made out of a one-piece body that is bent to achieve the said angle.

[0089] The enclosing portion 106 is provided with a through bore 100 adapted to receive and contain the shaft member 68 in such a manner that the hinge member 70 can rotate about the shaft member 68. A first brushing 64 is provided in the first end of the shaft member 68, while a second brushing 66 is attached to the opposite end of the shaft member 68.

[0090] The frame 6 is provided with a recess 14 configured to receive a sealing member. The two support members 76, 76' are arranged to support the brushings 64, 66 and thus the shaft member 68 enclosed by the brushings 64, 66. The support members 76, 76' and the support plate 78 that they protrude from constitute a mounting 74 made as a one-piece body.

[0091] A recess 72 is provided in the mounting 74. The recess 72 is configured to receive a shaft 38 and hereby rotatably attach the arm member 32 to the recess 72 provided in the mounting 74.

[0092] Fig. 5 a) illustrates a schematic cross-sectional view of a locking unit 56 according to the invention. The locking unit 56 prevents unauthorized opening of the cover 4. The locking unit 56 comprises a locking head member 46 configured to receive a tool or a key in order to lock or unlock the locking unit 56 and prevent and give access to the well or manhole below the cover 4, respectively.

[0093] A recess 88 is provided in the front side of the cover 4. The recess 88 is configured and shaped to receive the locking head member 46 and the plate member (a washer) 58 and still allowing a tool or key to being brought into engagement with the locking unit 56 for locking and unlocking the locking unit 56.

[0094] A cylindrical portion 90 is provided in the cover 4. The cylindrical portion 90 is provided with a first portion having a first diameter 92 and a second portion having a second larger diameter 92'. The bolt 44 has a diameter slightly smaller than the first diameter 92, while the locking arm 60 has a larger diameter slightly smaller than the second diameter 92'. The locking unit 56 cannot be removed from the cylindrical portion 90 by pulling it upwards as long as the bolt 44 is attached to the locking arm 60, since the diameter of the locking arm 60 exceeds the diameter 92 of the first portion.

[0095] The locking member 52 extends basically perpendicular to the locking arm 60. The locking member 52 can be brought into a locked and unlocked position upon rotation. A bore 94 is provided in the locking arm 60 and a spring 50 is arranged in the bore 94. A recess 54 is provided in the bottom portion of the bore 94. It is possible to replace the recess 54 with another structure (e.g. a rectangular-shaped or star-shaped structure) suitable for receiving a tool (e.g. a screw driver). The recess 54 is provided as a safety mechanism allowing the locking unit 56 to be unlocked by using a standard tool (e.g. a screwdriver) brought into engagement with the recess 54.

[0096] The upper portion of the bore 94 is threaded, while a spring 50 is provided in the lower portion of the bore 94. When a tool or key is applied to unlock the locking unit 56, the bolt 44 engages the threaded portion of the bore 94 and the spring 50 is compressed so that the locking member 52 is brought into fixing contact with the fixed support 86.

[0097] When a tool or key is used to unlock the locking unit 56, the spring 50 will expand and the rotation of the bolt 44 will reduce the vertical force applied by the locking member 52 towards the fixed support 86. When the vertical force applied by the locking member 52 towards the fixed support 86 is reduced, it is possible to rotate and hereby release the locking member 52 from the engagement with the fixed support 86. Accordingly, the cover may be opened.

[0098] The locking member 52 can be brought into a closed and open configuration upon rotating the locking member 52 by using a tool or a key or alternatively a standard screwdriver. In a locked configuration, the locking unit 56 presses against both the recess 88 and the fixed support 86 so that the locking unit 56 neither can be rotated nor displaced vertically. In the open configuration, the locking member 52 can be rotated and displaced vertically. The mounting 84 prevents the locking unit 56 from falling into the well/manhole.

[0099] Fig. 5 b) illustrates three different views of a locking arm 60 according to a locking unit 56 according to the invention. An engagement member 140 is provided in the top portion of the locking arm 60. A bore 94 is provided in the locking arm 60, and a recess 54 is provided in the bottom portion of the bore 94. While the engagement member 140 extends parallel to the length of the locking member 52, the recess 54 extends perpendicular to the length of the locking member 52. The engagement member 140 may be used to unlock the locking arm 60, if the bolt 44 is lost, removed or damaged. Hereby, the engagement member 140 provides an alternative to the recess 54 provided in the bottom portion of the bore 94.

[0100] Fig. 6 illustrates different schematic views of a cover assembly 2 according to the invention. The cover 4 is closed in Fig. 6 a). In Fig. 6 b), the cover 4 is in a fixed but not fully opened configuration. In Fig. 6 c), the cover 4 is in a fully opened configuration. Fig. 6 d) illustrates a cross-sectional close-up view of a sealing member 14. The cover assembly 2 corresponds to the one explained with reference to Fig. 3.

[0101] In Fig. 6 a), the cover 4 is closed, and the locking unit 56 is locked. Accordingly, the inner tube 18 of the lift-assist mechanism 82 is displaced into the pipe member 28.

[0102] In Fig. 6 b), the cover 4 is in a fixed but not fully opened configuration. Therefore, the inner tube 18 of the lift-assist mechanism 82 has been displaced partly out of the pipe member 28.

[0103] In Fig. 6 c), the cover 4 is in a fully opened configuration. Consequently, the inner tube 18 of the lift-assist mechanism 82 has been further displaced out of the pipe member 28. Moreover, the arm member 22 is brought into engagement with the corresponding attachment member 24 in order to fix the inner tube 18 relative to the pipe member 28.

[0104] Fig. 6 d) illustrates a cross-sectional close-up view of a sealing member 14 configured to be inserted into the recess 80 provided in the frame 6. The sealing member 14 has a basically rectangular cross-section and is provided a through bore 114 having a circular cross-section. The through bore 110 makes the sealing member 14 compressible and shapeable.

[0105] The sealing member 14 comprises a first notch 110 and a second notch 112 provided in the lower portion of the sealing member 14. A protrusion 108 is provided in the upper left corner region of the sealing element 14. The sealing member 14 fits the geometry of the recess 80 into which the sealing member 14 is intended to be arranged.

[0106] While Fig. 7 a) illustrates a back view of a mounting assembly housing 62 of the invention, Fig. 7 b) illustrates a side view of the mounting assembly housing 62 shown in Fig. 7 a).

[0107] The mounting assembly housing 62 comprises a hinge member 70 having a first plate member and a second plate member angled approximately 80 degrees relative to each other. The hinge member 70 comprises an enclosing portion 106 enclosing a through-going shaft member 68. The enclosing portion 106 is sandwiched between a first brushing 64 and a second brushing 66 enclosing the end portions of the shaft member 68. The brushings 64, 66 are supported by the top portion 142 of the support members 76, 76'. The support member 76 comprises an upper support member 124 having a sloped surface 128 that bears against a corresponding support surface 130 of a lower support member 126.

[0108] A threaded screw member 132 is screwed into a threaded bore 138 going through the upper support member 124 and extending further in the lower support member 126. A nut 136 is screwed to the distal portion of the threaded screw member 132. Another threaded screw member 134 is screwed into an additional threaded through bore extending through the lower portion of the upper support member 124. The screw member 134 protrudes from the lower portion of the upper support member 124 and bears against the lower portion of the lower support member 126.

[0109] By changing the position of the threaded screw member 132 in the threaded bore 138, it is possible to provide a horizontal displacement of the upper support member 124 relative to the lower support member 126. Hereby, the horizontal position of the top portion 142 of the upper support member 124 is changed. Accordingly, it is possible to adjust the vertical position of the top portion 142 of the upper support member 124 in order to make sure that the shaft member 68 extends horizontally and that the vertical position of the bearings 64, 66 are kept in the cavity provided in the frame 6.

[0110] Fig. 8 shows a side view of a mounting assembly housing 62 of the invention. The mounting assembly housing 62 comprises a hinge member 70 comprising a first plate member 12 angled approximately 80 degrees relative to a second plate portion 104 comprising an enclosing portion 106 enclosing a through-going shaft member 68. The enclosing portion 106 is sandwiched between a first brushing 64 and a second brushing (not shown) enclosing the end portions of the shaft member 68. The support member 76 supports the brushing 64.

[0111] The contact surface 122 of the brushing 64 is configured to bear against and be received by a corresponding cavity 118 provided in the horizontal surface member 120 of the frame 6 that is provided above the mounting assembly housing 62. Thus, the cover 4 can be detachably attached to the frame 6 by mounting the hinge member 70 in the cavity 118 provided in the frame 6.

List of reference numerals



[0112] 
2
Cover assembly
4
Cover
6
Frame
8
Mounting assembly housing
10
Concrete block
12
Pipe
14
Sealing member
16
Liquid
18
Inner tube
19, 19', 29, 29'
End portion
20
Mounting
22
Arm member
24
Attachment member
26
Shaft
28
Pipe member
30
Insulation material
32
Arm member
34
Shaft
36
Hinge member
38
Shaft
40
Protrusion
42
First portion
43
Second portion
44
Bolt
46
Locking head member
48
Threaded portion
50
Spring
52
Locking member
54
Recess
56
Locking unit
58
Plate member
60
Locking arm
62
Mounting assembly housing
64, 66
Bushing
68
Shaft
70
Hinge member
72
Recess
74
Mounting
76, 76'
Support member
78
Support plate
80
Recess
82
Lift-assist mechanism
84
Mounting
86
Fixed support
88
Recess
90
Cylindrical portion
92, 92'
Diameter
94
Bore
F
Force
96
Reinforcement member
98, 98'
End portion
100, 114, 116
Through bore
102
First plate
104
Second plate
106
Enclosing portion
108
Protrusion
110, 112
Notch
118
Cavity
120
Horizontal surface member
122
Contact surface
124
Upper support member
126
Lower support member
128, 130
Sloped surface
132, 134
Treaded screw member
136
Nut
138
Treated bore
140
Engagement member
142
Top portion



Claims

1. A cover assembly (2) comprising:

- a frame (6) having a peripheral wall defining an access opening;

- a cover (4) rotatably mounted to the frame (6) by means of an attachable mounting assembly (34, 36) comprising a shaft member (34, 68) rotatably mounted in a hinge member (34, 36, 64, 66, 68, 70) having an enclosing portion (106) that at least partially encloses the shaft member (34, 68), characterised in that the hinge member (34, 36, 64, 66, 68, 70) is rotatably mounted in a cavity (118) provided in the frame member (6) in such a manner that the longitudinal axis of the shaft member (34, 68) is fixed in a predefined vertical position relative to the frame (6).


 
2. A cover assembly (2) according to claim 1, characterised in that the cavity (118) is configured to receive and maintain the shaft member (34, 68) or one or more brushings (64, 66) or bearings attached to the shaft member (34, 68) and that the cavity (118) is provided at the lower side of a surface member (120) of the frame (6).
 
3. A cover assembly (2) according to claim 1 or claim 2, characterised in that a support unit (76, 76') is provided to support the shaft member (34, 68) or one or more brushings or bearings attached to the shaft member (34, 68) of the hinge member (34, 36, 64, 66, 68, 70).
 
4. A cover assembly (2) according to claim 3, characterised in that the (4) support unit (76, 76') comprises:

- a first support member (76) supporting a first portion of the shaft member (34, 68) or one or more brushings or bearings attached to the shaft member (34, 68);

- a second support member (76') supporting a second portion of the shaft member (34, 68) or one or more brushings or bearings attached to the shaft member (34, 68).


 
5. A cover assembly (2) according to claim 3 or claim 4, characterised in that the (4) support unit (76, 76') is height-adjustable.
 
6. A cover assembly (2) according to claim 5, characterised in that the (4) support unit (76, 76') comprises an upper support member (124) provided on a lower support member (126).
 
7. A cover assembly (2) according to claim 5, characterised in that the upper support member (124) is provided with a sloped surface (128) and that the lower support member (126) is provided with a corresponding sloping surface (130), wherein the sloped surface (128) of the upper support member (124) is bearing against the sloping surface (130) of the lower support member (126), wherein the support unit (76, 76') is provided with means (132, 134, 136, 138) for adjusting the vertical position of the upper support member (124) relative to the lower support member (126) and maintaining the upper support member (124) in a fixed position relative to the lower support member (126).
 
8. A cover assembly (2) according to one of the preceding claims, characterised in that a lift-assist mechanism (82) is integrated in the cover (4), wherein the lift-assist mechanism (82) comprises an inner tube (18) and a pipe member (28), wherein the inner tube (18) comprises a first member (24) and the pipe member (28) comprises another member (22), wherein the lift-assist mechanism (82) comprises means (20, 22, 24, 26) for fixing the first member (24) to the second member (22).
 
9. A cover assembly (2) according to claim 8, characterised in that the lift-assist mechanism (82) is a gas-assisted or spring-assisted cylinder
 
10. A cover assembly (2) according to one of the claims 8-9, characterised in that the lift-assist mechanism (82) comprises an inner tube (18) and a pipe member (28), wherein the inner tube (18) is configured to be at least partially displaced into the pipe member (28), wherein an attachment member (24) is provided at the inner tube (18), wherein a slot extending along the longitudinal axis of the pipe member (28) is provided in such a manner that the attachment member (24) can be displaced through said slot, wherein an arm is rotatably mounted on a mounting attached to the pipe member (28).
 
11. A cover assembly (2) according to one of the claims 8-10, characterised in that the cover (4) comprises at least one reinforcement member (96), wherein the lift-assist mechanism (82) is mounted to be displaced through said at least one reinforcement member (96).
 
12. A cover assembly (2) according to one of the preceding claims, characterised in that the cover (4) comprises a locking unit (56) comprising:

- a locking head member (46) mounted on a locking arm (60) by means of a bolt (44);

- a locking member (52) mounted on or integrated in the locking arm (60) in such a manner that the locking member (52) extends basically perpendicular to the locking arm (60), wherein a mounting (84) preventing the locking member (52) from being moved downwards is provided under the locking member (52).


 
13. A cover assembly (2) according to claim 12, characterised in that a recess (54, 140) is provided in the locking arm (60).
 
14. A cover assembly (2) according to one of the preceding claims, characterised in that the enclosing portion (106) of the hinge member (36, 70) and the shaft member (36, 68) is arranged in a position in which ingress of water from above is prevented.
 




Drawing




























Search report









Search report