ADJUSTMENT SYSTEM FOR THE FITTINGS OF A TILT AND/OR TURN WINDOW

Abstract

 An adjustment system is provided with fittings of a window with a fixed frame and a leaf that can be tilted and/or turned. The fittings comprise an arm (3,34) that can be hingedly connected to the fixed frame. Characteristic is that the adjustment system is provided with a fixed section (8) that can be fixedly attached to the leaf, and a slideable section (7) that is slideable in a longitudinal direction relative to the fixed section, whereby the arm can be connected to the slidable section, and whereby the fixed section and the slidable section are connected relative to each other by an adjusting screw (24) provided with a head (26) with toothing (31) which acts as gearwheel into which a key (32) can hook, such that when rotating the key, the adjusting screw rotates, said rotation being converted into a shift of the slidable section relative to the fixed section.

Description

[0001] The present invention relates to an adjustment system for fittings of a tilt window and fittings provided with such adjustment system.

[0002] More specifically the invention relates to an adjustment system for fittings for a window with a fixed frame and a leaf that has been tiltably and/or rotatably applied, whereby the adjustment system is intended for aligning the relative position of leaf and fixed frame.

[0003] Tilt windows are generally known. If the control of such tilt window is in the tilt position, the leaf can hinge around a horizontal axis to a certain fixed open tilt position whereby at the upperside of the window a certain opening is created, i.e. the tilt opening. To maintain said tilt opening, the fittings typically provide a scissor mechanism which is attached at the upperside of the window between the leaf and the fixed frame.

[0004] The scissor mechanism comprises a main arm, a support arm, and a support part which is fixedly attached to the leaf, typically in a fitting groove provided to this end. The main arm is hingedly and translatively connected to the leaf at one end and at the other end is hingedly connected to the fixed frame. At one end the support arm is hingedly connected to the main arm, at the other end it is connected to the support part.

[0005] The scissor mechanism is such that the main arm and the support arm can hinge relative to each other whereby in closed condition of the window, the main arm and the support arm are positioned substantially parallel relative to each other. When tilting the window to the open tilt position, both arms turn open whereby simultaneously the hinge at the end of the main arm that is translatively connected to the leaf, shifts.

[0006] In practice, imperfections when mounting the scissor mechanism of the fittings or load during use may cause the upperside of the leaf not to be parallel with the upperside of the window opening in the fixed frame, and the leaf to sag, for example. As the support part of the scissor mechanism is fixedly attached to the leaf it is difficult to raise (or lower) the leaf by moving the support part to align the leaf and the fixed frame relative to each other.

[0007] An objective of the invention is to provide an adjustment system that allows the relative position between leaf and fixed frame to be aligned during and after mounting, said adjustment preferably being executed such that little force is required for making the adjustment.

[0008] Another objective of the invention is to providing a solution whereby the accuracy of the adjustment system is adaptable, for example, depending on the dimensions and the weight of the window.

[0009] Yet a further objective of the invention is to provide a solution whereby the adjustment system is easily accessible and preferably applicable for both left- and right-opening tilt and/or turn windows.

[0010] To at least partially meet one or several of the aforementioned objectives, the invention provides an adjustment system for fittings of a window with a fixed frame and a leaf that can be tilted and/or turned. Typically, a fixed frame and leaf are made from profiles, for example aluminium, which on their inner contour and outer contour respectively are provided with fitting grooves. Fitting grooves are known and are typically formed by two upright parallel ribs of the profiles which are positioned at a distance from each other and the free edges of which are bent towards each other to form two undercut longitudinal grooves. Fitting components may be applied in the fitting grooves, possibly slideably. Typically, the slidable fitting components are provided at one longitudinal edge or both longitudinal edges with lateral guides which engage with the corresponding undercut longitudinal groove or longitudinal grooves of the fitting groove for slidingly guiding the fitting components in the fitting groove.

[0011] The fittings comprise an arm, one end of which can be hingedly connected to the fixed frame. The adjustment system comprises a fixed section that is fixedly attachable in a fitting groove along an outer contour of the leaf provided to that end, and a slidable section in longitudinal direction that is slidable relative to the fixed section, whereby the arm of the fittings can be connected to the slidable section of the adjustment system.

[0012] The fixed section and the slidable section of the adjustment system are connected relative to each other by an adjusting screw provided with a head and a shaft that extends axially relative to the head, whereby one of the fixed section or the slidable section encloses the head of the adjusting screw and is provided with a slot and a passage, whereby the dimensions of the slot, the passage, and the adjusting screw are aligned relative to each other such that the head of the adjusting screw fits in the slot, and the shaft of the adjusting screw fits through the passage, but the head does not. The slot is delimited by a transverse wall through which the slot is connected to the passage and an opposite transverse wall in which a recess is provided.

[0013] The adjusting screw is provided with a head with toothing which acts as a gearwheel into which a key with complementary toothing, which acts as driver gearwheel, can hook. The upperside of the head of the adjusting screw is provided with a central protrusion which is inserted at least partially fittingly in the recess in the transverse wall. The section enclosing the head, is provided with an adjustment opening which extends from one of the longitudinal sides of the section enclosing the head up into the slot, which is configured such that when the key is placed in the adjustment opening, the head and the key partially overlap in a radial direction of the head, whereby the toothings of the key and the head hook into each other, such that, through the operation of the gearwheel, the adjusting screw can rotate by rotating the key. The rotation of the adjusting screw is converted into a shift of the slidable section relative to the fixed section, in the longitudinal direction.

[0014] Said configuration means the head of the adjusting screw is locked as it were in the slot in the longitudinal direction and in the transversal direction and consequently has restricted slideability relative to the section enclosing the head, whereas there is sufficient space for the adjustment opening(s) to insert the key beyond the toothing of the head. The configuration according to the invention, whereby the protrusion of the adjusting screw extends in the recess, not only contributes to the adjusting screw, when in use, being held firmly in place, but mostly ensures a good transfer of the load of the window, whereby the friction remains limited because of the limited contact surface between the upperside of the protrusion and the bottom of the recess. The limited friction allows a simpler and more sensitive operation of the adjustment system.

[0015] The lateral accessibility of the adjustment opening makes sure that, in mounted condition, simple access is ensured for the user or person skilled in the art, to set or adjust the distance between the slidable section and the fixed section, even for windows whereby the fixed frame does not or barely protrude from under the ceiling. Furthermore, the configuration is such that the adjustment opening (and when in use, the key) overlap in height (when in use, the dimension between the fixed frame and the leaf) with the (head of the) adjusting screw. This has the advantage that the height of the adjustment system is limited and the adjustment system is therefore more widely applicable, more in particular also for windows with a very restricted mounting space.

[0016] Optionally the adjusting screw can be positioned such that the longitudinal axis of the adjusting screw is parallel to the longitudinal direction in which the fixed section and the slideable section can shift relative to each other. This ensures that the connections between the adjusting screw and the fixed and slidable section are loaded substantially axially.

[0017] In an embodiment according to the invention, the head of the adjusting screw is enclosed by the fixed section of the adjusting screw. Alternatively, the head of the adjusting screw is enclosed by the slidable section of the adjusting screw.

[0018] The key is for example a six-lobe key, known under the brand name Torx, with complementary toothing but it can also be another key or screwdriver with complementary toothing at one end in the outer contour which can act as driver gearwheel.

[0019] The toothings of the adjusting screw can be applied in the upper edge, the lower edge or the side edge of the head and alternately comprise slots and ribs. The number of ribs or in other words the relative distance between the ribs can be optimised. Other parameters that can be optimised include the diameter of the key, the location of engagement of the key on the head of the adjusting screw, and the pitch of the adjusting screw. Said parameters determine the transmission ratio and consequently also the accuracy of the adjustment and the force required for operating the adjustment system. By adequately optimising said parameters, an appropriate adjusting screw can thus be provided which is adapted to the specific circumstances such as, for example, the dimensions and/or the weight of the window.

[0020] In an embodiment according to the invention the ribs and slots of the toothing of the head of the adjusting screw extend in a longitudinal direction, whereby the longitudinal direction of ribs and slots form an angle with the longitudinal axis of the adjusting screw. For example, 90° can be chosen for said angle such that the key for rotating the adjusting screw is oriented at right angles relative to the longitudinal axis of the adjusting screw. Alternatively, an angle between -90° and 90° can also be chosen. Inserting the key at an angle benefits the accessibility. For example, this allows the adjustment system to be reached laterally from the inside of the window.

[0021] Also in an embodiment according to the invention, the shaft of the adjusting screw is threaded for screwably connecting the adjusting screw to the section not enclosing the head, for example through a screw opening in the side of the section not enclosing the head that faces the section enclosing the head.

[0022] Optionally, the section enclosing the head can be provided with an additional adjustment opening, said additional adjustment opening extending from the other opposite longitudinal side of the section enclosing the head up to the slot. The advantages of the adjustment system being accessible from both longitudinal sides are that one and the same embodiment of the adjustment system can be mounted on the leaf of a tilt and/or turn window both for a left- and a right-opening leaf, whereby the adjustment system is always accessible from the inside of the window and the direction for adjusting the leaf up or down is the same in the left- and right-opening leaf.

[0023] Optionally, the dimensions of the recess and the central protrusion can be aligned such that the depth of the recess is less than the length of the central protrusion, whereby the depth is the dimension in longitudinal direction of the slidable section, and the length is the dimension in axial direction of the adjusting screw. This creates more space for applying the adjustment opening(s) partially overlapping with the slot while the adjusting screw remains locked.

[0024] Furthermore, optionally the diameter of the central protrusion can be made smaller than the diameter of the shaft of the adjusting screw. Because the toothing in the upper edge of the head runs up to the central protrusion, the ribs and slots of the toothing are longer which allows a greater overlap to be created between the toothings of the head and the key and thus a better coupling.

[0025] The invention also relates to fittings for a window with a fixed frame and a leaf that can be tilted around a horizontal axis. The fittings comprise a main arm, one end of which can be hingedly connected to the fixed frame and at the other end can be hingedly and slideably connected to the leaf, a support arm hingedly connected to the main arm at one end, and the adjustment system as described in one of the aforementioned embodiments or a combination thereof, whereby the other end of the support arm is hingedly connected to the slidable section of the adjustment system, whereby the slidable section is slideable in the fitting groove in a longitudinal direction and whereby the fittings are configured such that, in the condition that the fittings are attached to the window, in close condition of the window, the main arm, the support arm and the support part are substantially parallel relative to each other and in open tilt position of the window, the main arm and support arm form an angle relative to each other and relative to the support part.

[0026] The fitting groove in which the fixed section and the slidable section of the adjustment system are fixedly and slideably applied respectively is typically a horizontal fitting groove in the profile at the upperside of the leaf.

[0027] The configuration according to the invention allows the lateral position of the engagement point of the support arm of the scissor mechanism on the leaf to be changed by sliding the slidable section with which the support arm of the scissor mechanism is hingedly connected when in use, allowing the leaf and fixed frame to be aligned relative to each other.

[0028] The invention also relates to fittings for a window with a fixed frame and a leaf that can be turned. The fittings comprise an arm, one end of which can be hingedly connected to the fixed frame, and the adjustment system as described in one of the aforementioned embodiments or a combination thereof, whereby the arm is connected to the slidable section of the adjustment system in one piece.

[0029] With the intention of better showing the characteristics of the invention, preferred embodiments of an adjustment system according to the invention for fittings for a tilt window and fittings equipped with such adjustment system are described hereinafter by way of an example, without any limiting nature, with reference to the accompanying drawings, wherein

figure 1 schematically shows a perspective view of an embodiment of the fittings with adjustment system according to the invention in partially disassembled condition;

figure 2 schematically shows a perspective view of an embodiment of the adjustment system according to the invention with inserted six-lobe key in different views, fig.2A and fig. 2B respectively;

figure 3 shows the adjustment system shown in fig.2, whereby fig.3A, fig.3B respectively show different cross-sections, and fig.3C in magnified form shows the section indicated with A in fig.3B;

figures 4A, 4B, 4C schematically show different embodiments of the adjusting screw of the adjustment system according to the invention, each in side view and in perspective view;

figure 5 schematically shows a perspective view of an embodiment of the fittings with adjustment system according to the invention in partially disassembled condition.

[0030] The example of fittings shown in figure 1 are fittings for a window with a fixed frame and a leaf which relative to the fixed frame is rotatable around a vertical axis and tiltable around a horizontal axis, and a control device for the fittings that is movable from a close position in which the window is closed, to a tilt position for opening the window by a tilt movement of the leaf, or to a turn position for opening the window by a rotational movement of the leaf. Figure 1 shows the fittings in a condition which corresponds with the leaf being opened by rotation such that the leaf forms an angle with the fixed frame.

[0031] The fittings shown contain a sliding slat 1 that is slideably applied lengthways in the fitting groove in the horizontal profile at the upperside of the leaf. The sliding slat 1 is workably connected, for example via one or several sliding parts 2 applied in the continuous fitting groove along the contour of the leaf, to the operating mechanism of the control device such that movements of the operating crank of the control device are converted into sliding movements of the sliding slat 1 in the horizontal fitting groove of the leaf. Examples of sliding parts include sliding slats and/or latches that are applied in the vertical and horizontal fitting grooves of the leaf and/or corner transmissions partially protruding in a vertical and partially protruding in a horizontal fitting groove in the corners of the leaf for converting the sliding movement of the sliding parts in the vertical fitting groove to the sliding parts in the horizontal fitting groove and/or vice versa.

[0032] To allow the leaf to tilt relative to the fixed frame of the window the fittings contain a scissor mechanism. The scissor mechanism is provided with a main arm 3 and a support arm 4. The support arm 4 is connected at one end via a hinge 5 to the main arm 3 and at the other end via a hinge 6 to a slideable section 7 of a support part. The slidable section 7 is slideably applied in the longitudinal direction in the horizontal fitting groove of the leaf. A fixed section 8 of the support part is provided next to the slidable section 7. The fixed section 8 of the support part is fixedly mounted in the horizontal fitting groove of the leaf using a fastening screw 9.

[0033] The slidable section 7 and the fixed section 8 of the support part are located above the sliding slat 1 such that the sliding slat 1 can slide under the support part in the fitting groove. To prevent the fastening screw 9 restricting the desired stroke of the sliding slat 1 or the sliding movement of the sliding slat 1, the sliding slat is provided with an oblong opening 10 in the longitudinal direction through which the fastening screw 9 is applied in the fitting groove.

[0034] The slidable section 7 and the fixed section 8 of the support part are connected to a fixed section 8 of the support part by an adjusting screw. The head of the adjusting screw is provided with a toothing that acts as gearwheel. On both longitudinal sides, the slidable section 7 is provided with an adjustment opening 11 through which a six-lobe key with a toothing that is complementary to the toothing in the head of the adjusting screw can be inserted such that the toothings hook into each other and by rotation of the key the slidable section 7 shifts toward or away from the fixed section 8 in longitudinal direction.

[0035] The main arm 3 is provided with a coupling pin 12 at one end with which the coupling pin is hingedly coupled with a glide piece 13 via a relevant coupling opening 14 in the glide piece. The glide piece 13 is applied longitudinally slideable relative to both the support part and the sliding slat 1 in the horizontal fitting groove. This is done such that the sliding slat 1 can slide under the glide piece 13 in the fitting groove and that when opening and closing the window with a tilt movement of the leaf, the glide piece 13 shifts toward or away from, respectively, the fixed support part. Alternatively, instead of a glide piece 13 a fixed main arm support can also be provided in which an oblong slot is applied in the longitudinal direction. In that case the main arm 3 is hingedly and slideably coupled with the main arm support by inserting the coupling pin in the oblong slot. This is done such that when opening and closing the window by a tilt movement of the leaf, the coupling pin respectively shifts toward or away from the support part in the oblong slot.

[0036] At its other end, the main arm 3 is hingedly connected to the fixed frame of the window. An end of the leaf arm 15 is hingedly connected to the end of the main arm 3 which in mounted condition of the fittings is located near the vertical axis around which the leaf can be rotated. Near its other end the leaf arm 15 is hingedly connected to a frame hinge piece which in turn is hingedly connected to a frame corner part 16 of the fittings which is fixedly applied in a frame groove in the horizontal profile of the fixed frame at the upperside of the window. A frame groove is a fitting groove formed on the inside in the profiles of the fixed frame of the window in which frame parts of the fittings can be applied which cooperate with parts of the fittings applied in the fitting grooves of the leaf. The leaf arm 15 is also hingedly connected to the frame arm 17 which in turn is hingedly connected to the frame corner part 16 and via a leaf hinge piece 18 is connected to the main arm. Said hinged connection between main arm 3 and fixed frame supports the tilting and turning of the leaf relative to the fixed frame.

[0037] The main arm 3 has the form of a slat whereby said slat shows a double bend 19. On the level of said double bend 19, a slot 20 is applied in the main arm 3 in the longitudinal direction. Between the double bend 19 and the end of the main arm 3 that is provided with the coupling pin 7, an extended protrusion is attached near the double bend which protrudes in the direction of the sliding slat 1. Separated from the extended protrusion in the transversal direction of the main arm 3, a short protrusion 21 is applied overlappingly with the extended protrusion in the longitudinal direction whereby an opening is formed which is laterally delimited by the short protrusion 21 and the extended protrusion respectively.

[0038] A peg 22 is provided on the sliding slat 1 with a substantially cylindrical form which in mounted condition of the fittings and with the window closed protrudes outwardly toward the main arm 3. As the sliding slat 1 is workably connected to the control device, said peg 22 shifts together with the control device and the peg 22 can act as a selection means for selecting a tilt position, whereby the peg is free, a turn position, whereby the peg is locked in transversal direction between the short protrusion 21 and the extended protrusion, or a close position, whereby the peg is located in the slot 20, according to the position of the operating crank.

[0039] Figures 2 and 3 show a perspective view and a cross-section respectively of an adjustment system comprising a support part. The support part comprises a fixed section 8 and a slideable section 7. When in use, the fixed section is fixedly attached in the horizontal fitting groove at the upperside of the leaf by screwing in a fastening screw 9 via the fastening opening 23. The slidable section 7 is inserted into the horizontal fitting groove at the upperside of the leaf and slideably connected to the fixed section 8. The slidable section 7 has an opening 25 for the hinge 6 of the support arm 4 for hingedly connecting the support arm 4 to the slidable section 7.

[0040] The slidable section 7 is connected to the fixed section 8 by an adjusting screw 24. The adjusting screw 24 has a head 26 and a shaft 27 which extends axially relative to the head according to a longitudinal axis. The fixed section 8 is provided with a screw opening 28 at the side facing the slidable section 7. A slot 29 and a passage extending from the short side of the slidable section facing the fixed section up into the slot 29 are provided in the slideable section 7. The head 26 of the adjusting screw 24 is fittingly inserted into the slot 29 of the slidable section 7 and its shaft 27 protrudes through the passage of the slot 29 in the direction of the fixed section 8. The threaded shaft 27 of the adjusting screw 24 is screwed into the screw opening 28 of the fixed section. The dimensions of the passage of the slot are such that the shaft 27 of the adjusting screw 24 fits through but the head 26 does not such that the head 24 is fittingly retained in the slidable section 7 and consequently the slidable section 7 shifts when rotating the adjusting screw 24. In the example shown, the longitudinal axis of the adjusting screw 24 is substantially parallel with the longitudinal direction of the support part and the fitting groove in which the support part is attached.

[0041] The head 26 of the adjusting screw 24 has a central protrusion 30 at the upperside. A section of said central protrusion 30 of the head 26 is fittingly inserted in a recess in the transverse wall delimiting the slot 29 opposite the transverse wall through which the slot 29 is connected to the passage through which the shaft 27 of the adjusting screw 24 protrudes in the direction of the fixed section 8 of the support part.

[0042] For rotating the adjusting screw 24, the head 26, at its upper edge, is provided with a toothing 31 consisting of alternating ribs and slots that radially extend in a longitudinal direction from the side edge of the head 26 up to the central protrusion 30. The longitudinal direction of the ribs is substantially at right angles to the longitudinal axis of the adjusting screw 24. The toothing 31 of the adjusting screw 24 acts as a gearwheel in which a six-lobe key 32 with complementary toothing 33, which acts as driver gearwheel, can hook into.

[0043] In the example shown, the slidable section 7 is provided with two adjustment openings 11 in the opposite longitudinal sides. The adjustment openings 11 extend up to the slot 29 and partially overlap with the slot 29 on the level of the toothing 31 of the adjusting screw 24 placed in the slot 29. When placing the key 32 in one of the adjustment openings 11 practically at right angles to the longitudinal axis of the adjusting screw 24, the toothings 31,33 of the key 32 and the adjusting screw 24 partially overlap in the longitudinal direction and hook into each other. Upon rotating the key 32, the operation of the gearwheel rotates the adjusting screw 24 around the longitudinal axis, said rotation being converted into a shift of the slidable section 7 relative to the fixed section 8 in the longitudinal direction.

[0044] Instead of the toothing 31 in the head and inserting the key 32 at substantially right angles as shown in figures 2 and 3, alternative configurations are also possible, a number of which are shown in fig.4.

[0045] Fig.4A shows an adjusting screw 24 whereby the toothing 31 is applied in the upper edge of the head 26 and the ribs and slots extend in the longitudinal direction from the side edge up to the central protrusion 30. The longitudinal direction forms an angle of approximately 60° with the longitudinal axis of the adjusting screw 24.

[0046] Fig.4B shows an adjusting screw 24 whereby the toothing 31 is applied in the lower edge of the head 26 and the ribs and slots radially extend in the longitudinal direction from the side edge of the head 26 up to the shaft 27. The longitudinal direction forms an angle of approximately 90° with the longitudinal axis of the adjusting screw 24.

[0047] Fig.4C shows an adjusting screw 24 whereby the toothing 31 is applied in the side edge of the head 26 and the ribs and slots extend in the longitudinal direction substantially parallel with the longitudinal axis of the adjusting screw 24.

[0048] The example of fittings according to the invention shown in figure 5 are fittings for a window with a fixed frame and a leaf that is rotatable relative to the fixed frame. The fittings comprise an arm 34 that can be hingedly connected at one end to the fixed frame, and an adjustment system.

[0049] The adjustment system comprises a fixed section 8 and a slideable section 7 that is formed by the arm 34. When in use the fixed section is fixedly attached to a fitting groove of the leaf. The slidable arm 34 is placed on the fixed section 8 and in longitudinal direction slideably connected to the fixed section 8 via an adjusting screw 24. The adjusting screw 24 has a head 26 and a shaft 27 that extends axially relative to the head according to a longitudinal axis.

[0050] The end of the slidable arm 34 is provided with a downwardly protruding part in which a screw opening is applied. A slot and a passage are provided in the fixed section 8. In mounted condition the head 26 of the adjusting screw 24 is fittingly inserted into the slot of the fixed section 8 and the shaft 27 protrudes through the passage of the slot in the direction of the downwardly protruding part of the slidable arm 34. The threaded shaft 27 of the adjusting screw 24 is screwed into the screw opening 28 of the slideable arm. The dimensions of the passage of the slot are such that the shaft 27 of the adjusting screw 24 fits through but the head 26 does not, such that the head 24 is fittingly retained in the fixed section 8 and consequently the slidable arm 34 shifts upon rotating the adjusting screw 24. In the example shown, the longitudinal axis of the adjusting screw 24 is substantially parallel with the longitudinal direction of the fixed section 8 and the fitting groove in which the fixed section is attached.

[0051] For rotating the adjusting screw 24, the head 26 is provided with toothing 31 at the upper edge. The toothing 31 of the adjusting screw 24 acts as a gearwheel in which a six-lobe key 32 with complementary toothing 33, which acts as driver gearwheel, can hook into.

[0052] In the example shown, the fixed section 8 is provided with two adjustment openings 11 in the opposite longitudinal sides. The adjustment openings 11 extend up to the slot 29 and partially overlap with the slot 29 on the level of the toothing 31 of the adjusting screw 24 placed in the slot 29. When placing the key 32 in one of the adjustment openings 11 practically at right angles to the longitudinal axis of the adjusting screw 24, the toothings 31,33 of the key 32 and the adjusting screw 24 partially overlap in the longitudinal direction and hook into each other. When rotating the key 32, the operation of the gearwheel rotates the adjusting screw 24 around the longitudinal axis, said rotation being converted into a shift of the slidable arm 34 relative to the fixed section 8 in the longitudinal direction.

[0053] The present invention is by no means limited to the embodiments described as an example and shown in the figures, but an adjustment system according to the invention as specified in the enclosed claims of fittings and fittings provided therewith can be realised in all kinds of forms and dimensions without departing from the scope of the enclosed claims.

Claims

1. An adjustment system for fittings of a window with a fixed frame and a leaf that can be tilted and/or turned, whereby the fittings comprise an arm (3,34) that can be hingedly connected to the fixed frame at one end, the adjustment system comprising a fixed section (8) that can be fixedly attached in a fitting groove along an outer contour of the leaf provided to that end, and

a slideable section (7) which in a longitudinal direction is slideable relative to the fixed section, whereby the arm can be connected to the slidable section, whereby the fixed section and the slidable section are connected relative to each other by an adjusting screw (24) provided with a head (26) and a shaft (27) which extends axially relative to the head, whereby one of the fixed section (8) or the slidable section (7) encloses the head (26) of the adjusting screw (24) and is provided with a slot (29) and a passage, whereby the dimensions of the slot, the passage and the adjusting screw are aligned to each other such that the head (26) of the adjusting screw fits in the slot and the shaft of the adjusting screw fits through the passage but the head does not,

characterised in that

the head of the adjusting screw is provided with toothing (31) that acts as a gearwheel into which a key (32) with complementary toothing (33) can hook,

the head of the adjusting screw is provided with a central protrusion (30) at the upperside and the slot (29) is delimited by a transverse wall through which the slot is connected to the passage and an opposite transverse wall, in which a recess is provided, in which the central protrusion of the head of the adjusting screw is at least partially fittingly inserted, and

the section enclosing the head is provided with an adjustment opening (11) which extends from one of the longitudinal sides of the section enclosing the head up into the groove, which is configured such that when the key is placed in the adjustment opening, the head and the key partially overlap in a radial direction of the head, whereby the toothings of the key and the head hook into each other, such that, through the operation of the gearwheel, the adjusting screw can rotate by rotating the key.

2. The adjustment system according to claim 1, characterised in that the section enclosing the head is the fixed section.

3. The adjustment system according to claim 1, characterised in that the section enclosing the head is the slidable section.

4. The adjustment system according to any one of the previous claims, characterised in that the shaft (27) of the adjusting screw (24) is threaded for screwably connecting the adjusting screw with the section not enclosing the head.

5. The adjustment system according to any one of the previous claims, characterised in that the toothing (31) of the head (26) alternately comprises ribs and slots that extend in a longitudinal direction, whereby the longitudinal direction of the ribs and slots forms an angle with the longitudinal axis of the adjusting screw (24).

6. The adjustment system according to any one of the previous claims, characterised in that the section enclosing the head (26) is provided with an additional adjustment opening (11) whereby the additional adjustment opening extends from the other opposite longitudinal side of the section enclosing the head (26) up to the slot.

7. The adjustment system according to any one of the previous claims, characterised in that the recess and the central protrusion (30) have a depth, i.e. the dimension in longitudinal direction of the section enclosing the head (26), and a length, i.e. the dimension in axial direction of the adjusting screw (24) respectively, whereby the depth of the recess less is than the length of the central protrusion.

8. The adjustment system according to any one of the previous claims, characterised in that the toothing (31) of the head (26) of the adjusting screw (24) is provided in an upper edge of the head.

9. The adjustment system according to any one of the previous claims, characterised in that the diameter of the central protrusion (30) is less than the diameter of the shaft (27) of the adjusting screw (24).

10. The adjustment system according to any one of the previous claims, characterised in that the longitudinal axis of the adjusting screw (24) is parallel with the longitudinal direction in which the fixed section (8) and the slideable section (7) can slide relative to each other.

11. Fittings for a window with a fixed frame and a leaf that can be tilted, said fittings comprising

a main arm (3) that at one end can be hingedly connected to the fixed frame and at its other end can be hingedly and slideably connected to the leaf,

a support arm (4) that is hingedly connected to the main arm at one end, and the adjustment system according to any one of the previous claims, whereby the support arm at its other end is hingedly connected to the slidable section (7) of the adjustment system, and whereby the fittings are configured such that, in the condition that the fittings are attached to the window, in the close position of the window, the main arm, the support arm and the fixed section are substantially parallel relative to each other and in open tilt position of the window, the main arm and the support arm form an angle relative to each other and relative to the fixed section.

12. Fittings for a window with a fixed frame and a leaf that can be turned, said fittings comprising an arm (34) that can be hingedly connected to the fixed frame at one end, and the adjustment system according to any one of the claims 1 to 10, whereby the arm is connected to the slidable section (7) of the adjustment system in one piece.

Drawing