Drive mechanism for a window regulator

Abstract

The invention relates to a driver (18) for a window regulator (8), comprising a rail slider (34) with a guide area (42) for longitudinally displaceable engagement with a guide rail (16) of the window regulator (8), and a sliding insert (38) clipped into the guide area (42) to improve the sliding properties of the driver (18) along the guide rail (16), wherein the sliding insert (38) has at least one elastically deformable damping element (52) which projects forward from the end face of the rail slider (34) as a stop for a counter-stop (30, 32) arranged on the guide rail (16).

Description

[0001] The invention relates to a drive mechanism for a window regulator, comprising a rail slider with a guide area for longitudinally sliding engagement with a guide rail of the window regulator, and a sliding insert clipped into the guide area to improve the sliding properties of the drive mechanism along the guide rail. The invention further relates to a window regulator with such a drive mechanism and a sliding insert for such a drive mechanism.

[0002] Movable vehicle windows are nowadays usually moved between a closed and an open position by electrically or electromechanically operated (vehicle) window regulators. Such a window regulator typically comprises an (electric) window regulator motor and a window regulator mechanism that connects the window regulator motor to the window pane, i.e., that couples the force transmission mechanism, and which is attached to a vehicle door or vehicle body.

[0003] To guide the window pane, for example in a vehicle door, it is provided with at least one driver as a pane guide element at a front and / or rear side window edge, which is guided in at least one guide rail (window regulator rail) of the window regulator mechanism in a sliding manner along the vehicle height (Z-direction) as an adjustment or guide track.

[0004] These types of actuators are typically located near the bottom edge or side edge of the window pane and are guided by a sliding rail on a guide rail of the actuating mechanism. The sliding rail is adjustable, for example, via a flexible cable within the window regulator mechanism, to move the window pane along the adjustment path between the closed and open positions.

[0005] The rail slider, which is positively mounted on the guide rail and arranged to slide along it, is manufactured, for example, using a two-component injection molding process and has two areas made of different plastic materials. A first area, which forms a surface section serving as a guide, has a low coefficient of friction for good sliding properties. Alternatively, it is known, for example, from DE 10 2018 213 360 A1, to use a sliding insert designed separately from the rail slider, which is attached to the rail slider, in particular clipped in place, to improve its sliding properties.

[0006] To ensure optimal sliding properties of a drive mechanism on the guide rail of a window regulator and to compensate for tolerances, it is desirable that the closing forces in the window regulator system remain constant and that the window pane opens and closes evenly in its end positions. Furthermore, the goal is for the end stops, which define the open and closed positions of the window, to be reached quietly or with minimal noise when the drive mechanism encounters a corresponding stationary or fixed counter-stop. In frameless cable-operated window regulators, this counter-stop is, for example, projected from the guide rail (raised, embossed), while in track-operated window regulators, it is often screwed or riveted to a support component of the vehicle door that holds the guide rail.

[0007] To achieve the end stops of the driver in the closed and open positions with reduced noise, the rail slider has, for example, two fixed or attachable damping elements as stops, by means of which the driver is stopped in a defined manner at a respective counter stop.

[0008] In the following, a "damping element" is understood to mean in particular a decoupling element that serves to absorb and / or reduce shocks, vibrations or kinetic energy.

[0009] The damping elements are made, for example, of a damping, rubber-elastic material, so that the kinetic energy of the driver upon impact with the counter-stop is damped, particularly by the elasticity (i.e., the modulus of elasticity) of the damping element material. This results in a mechanically damped and noise-reduced impact at the respective counter-stop. The damping elements are designed separately from the rail slider and must be attached to it in an additional assembly step.

[0010] From DE 10 2010 040 047 A1 and DE 10 2010 064 673 B3, for example, window regulator actuators are known in which elastically deformable damping elements are arranged on a cable receiving adapter of the actuator. The damping elements are at least partially arranged on or integrated into a multifunctional cap that can be attached to the cable receiving adapter.

[0011] The invention is based on the objective of providing a particularly suitable actuator for a window regulator. The invention is further based on the objective of providing a particularly suitable window regulator and a particularly suitable sliding insert.

[0012] With regard to the follower, the problem is solved according to the invention by the features of claim 1, with regard to the window regulator by the features of claim 9, and with regard to the sliding insert by the features of claim 10. Advantageous embodiments and further developments are the subject of the dependent claims. The advantages and embodiments mentioned with regard to the follower are also transferable mutatis mutandis to the window regulator and / or the sliding insert, and vice versa.

[0013] The conjunction “and / or” is to be understood here and in the following as meaning that the features linked by means of this conjunction can be both common and alternative to each other.

[0014] The actuator according to the invention is designed, suitable, and configured for a window regulator, in particular for a vehicle window regulator of a motor vehicle. The window regulator is preferably designed as a cable-operated window regulator.

[0015] The actuator has a rail slider for coupling to an adjusting mechanism of the window regulator (window regulator mechanism). The rail slider has a guide area that acts as a rail grip for a guide rail of the window regulator, designed to receive a profile section of the guide rail, particularly an L- or Z-shaped section (e.g., with a Z-profile). In the installed state, the guide area ensures that the rail slider is in a longitudinally displaceable, positive-locking engagement with the guide rail or its profile section.

[0016] The drive unit preferably also includes a disc holder for attachment to a window pane, particularly by clamping. The disc holder can be designed separately from the rail slider, or it can form a common base body of the drive unit with the rail slider.

[0017] The driver also features a separate sliding insert, distinct from the rail slider and thus neither integrally nor integrally connected to it, to improve the driver's sliding properties along the guide rail. This sliding insert is specifically designed as a plastic component with particularly good sliding properties, meaning it offers the lowest possible frictional resistance when guided along the guide rail. This ensures virtually resistance-free guidance of the driver along the guide rail.

[0018] The rail slider and the sliding insert are preferably each manufactured as injection-molded parts. This ensures particularly cost-effective and efficient production of the drive unit. In one conceivable embodiment, the rail slider is made of a fiber-reinforced plastic, in particular a glass fiber-reinforced polyamide (PA-GF) or a glass fiber-reinforced polypropylene (PP-GF), while the sliding insert is made of polyoxymethylene (POM).

[0019] The sliding insert is designed as a rail slider clip, which is clipped to the rail slider, particularly to or within the guide area. In the clipped or clipped-on state, the sliding insert forms the contact or running surface (sliding surface) of the driver on the guide rail.

[0020] According to the invention, the sliding insert has at least one elastically deformable damping element which projects forward from the end face of the rail slider as a stop for a counter-stop arranged on the guide rail. This provides a particularly suitable drive mechanism for a window regulator.

[0021] In contrast to the prior art, the damping element here is not arranged on a cable-mounting adapter or a multifunctional cap that can be attached to it, but is integrally integrated with the sliding insert. This is particularly advantageous for carriers where no cable-mounting adapter is provided and where the cable chamber for coupling the rail slider to a traction cable is integrated into the rail slider itself. For example, a nipple attachment for a cable nipple of the traction cable is molded into the body of the rail slider.

[0022] In an advantageous further development, the sliding insert has two elastically deformable damping elements which project from the rail slider on opposite end faces, each acting as a stop for a corresponding counter-stop arranged on the guide rail. This provides end stops for both the open and closed positions of the window pane, which can be moved by the window regulator.

[0023] The following explanations refer specifically to a drive unit with a single damping element. However, the explanations can also be applied analogously to a drive unit with two damping elements.

[0024] In a suitable design, the damping element is integrally molded onto the sliding insert as a single piece, i.e., monolithically. Preferably, the sliding insert and the damping element are manufactured as a single injection-molded part. This allows for particularly simple production of the sliding insert. Thus, a damping element is integrated into or onto the sliding insert. This eliminates an additional assembly step for attaching the damping element to the sliding insert, and in particular, there is no risk of incorrect assembly.

[0025] In a preferred embodiment, the damping element is designed as a spring-elastic damping tab which, in the assembled state, is angled at a predetermined inclination angle to the end face of the rail slider such that an outer surface of the damping tab forms a stop surface for the counter-stop. Particularly in a one-piece design with the sliding insert, a plastic spring is thus implemented for damping.

[0026] The geometry of the damping tab is chosen such that the distribution of stress and deformation within the damping tab is reduced to a damped restoring force during compression. The damping tab is therefore a spring element that exhibits both a spring constant and internal damping with a damping constant (damping coefficient).

[0027] In a possible further development, the damping element has a shoulder that limits elastic deformation of the damping element by means of a stop against the rail slider. Limiting the elastic deformation of the damping element by the shoulder stop ensures dimensional stability of the elastically deformable damping element when the end stop is reached, thus ensuring consistent window pane positions in the end positions.

[0028] An additional aspect of the invention provides that the damping element on the end face of the rail slider overlaps or covers at least a portion of a blind-hole-like receptacle of the rail slider. In particular, the damping element has a raised extension which, in a relaxed state of the damping element, preferably engages at least a portion of the receptacle. Preferably, a cylindrical rubber or elastomer element is inserted into the receptacle.

[0029] The rubber or elastomer element is made, for example, from a damping material, such as a foamed plastic, for example polyurethane (PUR), or a rubber material.

[0030] The diameter of the receptacle is preferably adapted to the diameter of the cylindrical rubber or elastomer element in such a way that the cylindrical rubber or elastomer element does not undergo any significant change in diameter when compressed.

[0031] Thus, the drive element comprises two elastically deformable elements arranged one behind the other in the direction of the adjusting force acting on the drive element. The damping element, in particular, exhibits lower elasticity than the rubber or elastomer element. Upon reaching the end stop, the spring-elastic damping element comes into contact with the counter-stop and, either immediately or after traversing an adjustable spring travel, transmits a portion of the adjusting force acting on the drive element to the rubber or elastomer element via its extension. The adjusting force is therefore damped both by the spring-flexible shape of the damping element or damping tab and by the material properties (modulus of elasticity, elasticity).

[0032] This design incorporates an elastically deformable damping system with multiple elastically deformable elements of varying damping types and / or elasticities, arranged successively or in a staggered pattern. This allows for optimization of the damping behavior when reaching the end stops by selecting the damping type and / or adjusting the elasticities of the various elastically deformable elements and their interaction upon reaching the end stop, while simultaneously maintaining the dimensional stability of the elastically deformable elements when reaching the end stop. This ensures consistent window pane positions at the end positions.

[0033] The staggering or series connection of the two elements is achieved by the fact that the damping element, for example designed as a damping tab, has on its side facing away from the stop surface the extension which is directed towards the receptacle of the rail slide which receives the rubber or elastomer element, wherein the extension dips into the receptacle of the rail slide which receives the rubber or elastomer element and is aligned with the rubber or elastomer element or preferably bears against it under preload.

[0034] The cylindrical shape of the rubber or elastomer element and its arrangement in a blind hole-shaped recess of the rail slider prevents deformation of the rubber or elastomer element that would reduce its service life due to "settling".

[0035] The damping element of the sliding insert and the rubber or elastomer element arranged on or in the rail slide enable controllable, highly effective damping when the end stop is reached, without any part of the elements being compressed due to "settlement" and thus significantly reducing their service life. Consequently, no significant material fatigue occurs in either the damping element of the sliding insert or the rubber or elastomer element of the rail slide, ensuring consistently high quality.

[0036] In a preferred application, the drive mechanism described above is part of a (vehicle) window regulator. The window regulator has a guide rail on which the drive mechanism is movably guided. A counter-stop is arranged on the guide rail, against which the drive mechanism acts as an end stop in the open or closed position of a (vehicle) window pane that can be moved by the window regulator. The arrangement of the damping element on the sliding insert of the drive mechanism results in a particularly suitable window regulator.

[0037] The sliding insert according to the invention is suitable and designed for a driver as described above. The sliding insert is designed as a rail slider clip and, as such, can be clipped into a guide area of ​​a rail slider of the driver. The sliding insert has at least one elastically deformable damping element which projects beyond the end face of the rail slider when clipped in. This results in a particularly suitable sliding insert.

[0038] An embodiment of the invention is explained in more detail below with reference to a drawing. The drawing shows: Fig. 1 In schematic representation a vehicle door with a window regulator with a guide rail and a follower, Fig. 2 in schematic sectional view along line II-II in Fig. 1 the driver with a sliding insert (clipped in) in a rail grip as a guide area of ​​a rail slider of the driver, Fig. 3 in perspective view the sliding insert of the driver with two end-faced damping elements, Fig. 4. Front view showing a section of the guide rail with a counter stop and the driver, Fig. 5. Front view showing a section of the guide rail and the drive mechanism. Fig. 6 in front view, partially showing the driver, and Fig. Figure 7 shows a section of the front view of the drive mechanism with a rubber or elastomer element.

[0039] Corresponding parts and sizes are always marked with the same reference symbols in all figures.

[0040] In the Fig. Figure 1 shows a simplified and schematic representation of a vehicle door 2 with a door module 4. The vehicle door 2 is specifically a side door of a motor vehicle. The door module 4 has a mounting bracket 6 with an electric window regulator 8 pre-mounted on it as an actuating device for a (vehicle) window pane 10.

[0041] The window regulator 8 has a window regulator motor 12, which acts on the window pane 10 by means of a window regulator mechanism 14. The window regulator mechanism 14 has a guide rail 16 and a drive element 18 coupled to the window pane 10.

[0042] In the illustrated embodiment, the window regulator 8 is designed as a simply guided cable window regulator. The window regulator mechanism 14 includes a cable 20 in addition to the guide rail 16.

[0043] The window regulator motor 12 of the window regulator 8 drives a cable drum 24 of the window regulator mechanism 14 via a gearbox 22. The gearbox 22 is preferably designed as a worm or spur gear. A pull cable of the cable pull 20 is arranged on the cable drum 24 such that rotations of the cable drum 24 caused by the gearbox 22 result in the pull cable being wound and unwound.

[0044] An upper cable deflection pulley or cable sheave 26 and a lower cable sheave 28 are attached to the guide rail 16, located at the opposite ends of the rail. The cable of the cable pulley 20 is guided around the cable sheaves 26 and 28, parallel to the guide rail 16.

[0045] When the actuator 12 is activated, the window pane 10 is moved to its (pane) position P. The window pane 10 can be moved reversibly between a closed position S, which represents the highest possible position P, and an open position O, which represents the lowest possible position P. In these positions S and O, the window pane 10 is in the Fig. Each of the following is indicated by a dashed line. The window pane 10, on the other hand, is shown in a semi-open intermediate position with solid lines.

[0046] To define the closed position S, an upper stop 30 is arranged on the guide rail 16. Similarly, to define the open position O, a lower stop 32 is arranged on the guide rail 16. The follower 16, which holds the window pane 10, abuts the upper stop 30 when the closed position S is reached, and the lower stop 32 when the open position O is reached.

[0047] The following information regarding spatial directions is given, particularly in a vehicle coordinate system, with respect to a vehicle door 2 designed as a side door. The abscissa (X-axis, X-direction) is oriented along the vehicle's longitudinal direction (direction of travel), the ordinate (Y-axis, Y-direction) along the vehicle's transverse direction, and the application axis (Z-axis, Z-direction) along the vehicle's height.

[0048] The assembly carrier 6 is essentially arranged in the XZ plane, with the longitudinal direction of the guide rail 16 being essentially aligned along the vehicle height Z. In its assembled state, the assembly carrier 6 acts, for example, as a wet / dry compartment divider for the vehicle door 2.

[0049] The Fig. 2 shows a section along line II-II in Fig. 1 the driver 18 with a rail slider 34 for sliding guidance of the driver 18 along the guide rail 16, and with a disc holder 36 arranged on the rail slider 34 for connection to a disc edge of the window pane 10. The driver 18 further has a sliding insert 38 designed separately from the rail slider 34.

[0050] The rail slider 34 has a guide area 42 that acts as a rail grip 40 for the guide rail 16. The guide area 42 is an approximately L-shaped recess, groove, or hollow chamber in which the sliding insert 38 is seated. The guide area 42, or the sliding insert 38, grips an L- or Z-shaped profile section of the guide rail 16. The guide rail 16 is thus in a longitudinally displaceable engagement with the rail slider 34.

[0051] The in Fig. 3. The sliding insert 38 shown separately is designed as a rail slider clip and is made of a comparatively low-friction plastic material, preferably polyoxymethylene (POM), wherein the rail slider 34 is preferably made of a (glass) fiber reinforced plastic, for example glass fiber reinforced polypropylene (GF-PP).

[0052] The sliding insert 38 has two sliding sections 44 as rail grip 40 and contact surface (sliding surface) for the guide rail 16, between which an optional connecting web 46 extends. A gripping tab 48 is molded onto the connecting web 46, by means of which the sliding insert 38 can be gripped when being inserted or clipped into the guide area 42.

[0053] Each of the sliding sections 44 has a clip tab 50 molded onto it for positive and / or force-fit clipping onto the rail slider 34. The spring-elastic clip tabs 50 are oriented towards each other and arranged parallel to the connecting web 46.

[0054] At the end faces of the sliding sections 44, a stop or damping tab is integrally formed as an elastically deformable damping element 52. The angled damping elements 52 have mutually facing, nose-like projections 54 which protrude upwards on an inner side of the damping elements 52.

[0055] The Fig. Figure 4 shows the driver 18 in a closed position S of the window pane 10, in which the driver 18 has moved against the upper counter stop 30. In this embodiment, the counter stop 30 is specifically projected (raised, embossed) from the guide rail 16. In other words, the counter stop 30 is designed as an offset of the guide rail 16 extending in the Y direction, against which the driver 18 abuts from below when it reaches the end position.

[0056] As in the Fig. As is relatively clearly visible in Figure 4, the damping elements 52 protrude upwards at the front face of the rail slider 34 when the slide insert 38 is clipped in. The damping elements 52 thus act as a stop for the counter-stops 30, 32.

[0057] The rail slider 34 has an integrally formed rope chamber 56 with two nipple attachments 58 for receiving a rope nipple each attached to the pull rope of the rope pull 20, whereby in the figures only one nipple attachment 58 arranged on the front of the rail slider 34 is shown.

[0058] In the Fig. 5 and Fig. Figure 6 shows the rail slider 34 partially transparent in an upper section, so that a blind-hole-like receptacle 58 of the rail slider 34 is visible. The receptacle 60 is provided in the end face of the rail slider 34 above the nipple attachment 58. A corresponding receptacle 58 is provided on the opposite end face of the rail slider 34.

[0059] As in the Fig. As shown in Figure 7, cylindrical rubber or elastomer elements 62 can be inserted or plugged into the receptacles 60. In the exemplary embodiment of the Fig. 7 The rubber or elastomer elements 62 terminate flush with the end face of the rail slider 34 with an outwardly facing end face. Alternatively, the rubber or elastomer elements 62 can also project beyond the end face of the rail slider or be recessed into the receptacle 60.

[0060] The receptacle 60 of the rail slider 34 is at least partially overlapped or covered by the respective damping element 52. In the embodiment shown, the projections 54 engage at least partially in the receptacles 60 when the damping elements 52 are in a relaxed state.

[0061] When a rubber or elastomer element 62 is inserted into the receptacle 60, the respective extension 54 rests against the outwardly facing end face of the rubber or elastomer element 62 or presses against the end face of the rubber or elastomer element 62 under preload of the damping element 52.

[0062] For example, in the Fig. 6 and Fig. As can be seen in Figure 7, the damping element 52 has a raised shoulder 64 on its fixed end side on one of its inner sides facing the end face of the rail slider 34. The shoulder 64 is positioned in the area of ​​a notch-like step offset 66 on the end face of the rail slider 34. In the initial state of the damping element 52, the shoulder 64 is spaced apart from the step offset 66. In other words, a clear gap is formed between the shoulder 64 and the step offset 66.

[0063] The shoulders 64 prevent, in particular, the sliding insert 38 from slipping out of the guide area 42 in the Z-direction by means of a shoulder 64 engaging the opposite end faces of the rail slider 34 in the area of ​​the step offsets 66.

[0064] When a counter-stop 30, 32 is approached, the outer surface of the damping element 52, which is aligned with the corresponding counter-stop 30, 32, initially rests against the respective counter-stop 30, 32. With a further adjustment movement of the driver 18 towards the counter-stop 30, 32, the affected damping element 52 is spring-elastically bent around the fixed-end connection to the sliding section 44 until the shoulder 64 comes to rest against the step offset 66. This terminates the movement of the driver 18 and positions the window pane 10 in its respective end position, i.e., the closed position S or the open position O. In other words, the shoulder 64 limits elastic deformation of the damping element 52 by a mechanical stop against the step offset 66 of the rail slider 34.

[0065] Depending on the dimensioning of the extension 54 and the rubber or elastomer element 62, and depending on whether the extension 54 rests against the rubber or elastomer element 62 under preload, the rubber or elastomer element 62 is elastically deformed or deformed immediately after the shoulder 64 strikes the step offset 66, or the extension 54 only comes into end-face contact with the rubber or elastomer element 62 and deforms it after traversing a predetermined damping distance.

[0066] In the first case, a combined damping effect of the damping element 52 and the rubber or elastomer element 62 occurs, whereas in the second case, the damping element 52 first absorbs part of the kinetic energy before transferring another part to the rubber or elastomer element 62.

[0067] In addition to the different restoring forces or elasticity types of the damping element 52 and the rubber or elastomer element 62, it is possible to adjust the damping behavior by appropriately dimensioning the damping element 52 and the rubber or elastomer element 62, so that when approaching the counter-stop 30, 32 no or only a minimal impact noise is perceptible.

[0068] The claimed invention is not limited to the embodiments described above. Rather, other variants of the invention can also be derived by a person skilled in the art within the scope of the disclosed claims without departing from the subject matter of the claimed invention. In particular, all individual features described in connection with the various embodiments can also be combined in other ways within the scope of the disclosed claims without departing from the subject matter of the claimed invention. Reference symbol list 2 vehicle doors 4 door module 6 aggregate carriers 8 power windows 10 window pane 12 window regulator motor 14 window regulator mechanism 16 guide rail 18 drivers 20 cable pull 22 gearboxes 24 rope drum 26 Rope pulley 28 Rope pulley 30 counterattack 32 Counterattack 34 rail gliders 36 disc holders 38 sliding insert 40 rail grip 42 Management area 44 Gliding section 46 Connecting bridge 48 Greiflasche 50 clip tabs 52 Damping element, damping tab 54 continuation 56 rope chamber 58 Nipple attachment 60 recordings 62 Rubber or elastomer element 64 Shoulder 66 step offset X Vehicle longitudinal direction Y Vehicle transverse direction Z Vehicle height direction QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2018 213 360 A1

[0005] DE 10 2010 040 047 A1

[0010] DE 10 2010 064 673 B3

[0010]

Claims

[1] Driver (18) for a window regulator (8), comprising - a rail slider (34) with a guide area (42) for longitudinally sliding engagement with a guide rail (16) of the window regulator (8), and - a sliding insert (38) clipped into the guide area (42) to improve the sliding properties of the driver (18) along the guide rail (16), - wherein the sliding insert (38) has at least one elastically deformable damping element (52) which projects forward from the end face of the rail slider (34) as a stop for a counter-stop (30, 32) arranged on the guide rail (16). [2] Driver (18) according to claim 1, characterized by , that the sliding insert (38) has two elastically deformable damping elements (52) which project from the rail slider (34) on the opposite end faces as a stop for a counter-stop (30, 32) arranged on the guide rail (16). [3] Driver (18) according to claim 1 or 2, characterized by , that the damping element (52) is integrally formed with the sliding insert (38). [4] Driver (18) according to one of claims 1 to 3, characterized by , that the damping element (52) is designed as a spring-elastic damping tab which is arranged at an angle to the front face of the rail slider (34) such that an outer surface of the damping tab forms a stop surface for the counter stop (30, 32). [5] Driver (18) according to any one of claims 1 to 3, characterized by , that the damping element (52) has a shoulder (64) which limits elastic deformation of the damping element (52) by a stop on the rail slider (34). [6] Driver (18) according to any one of claims 1 to 5, characterized by , that the damping element (52) overlaps at least partially a blind-hole-like receptacle (60) of the rail slider (34). [7] Driver (18) according to claim 6, characterized by , that the damping element (52) has a raised extension (54) which, in a relaxed state of the damping element (52), engages at least partially in the receptacle (60). [8] Driver (18) according to claim 6 or 7, characterized by , that a cylindrical rubber or elastomer element (62) is inserted into the receptacle (60). [9] Window regulator (8) comprising a guide rail (16) with at least one counter stop (30, 32) arranged thereon and a driver (18) slidably guided on the guide rail (16) according to one of claims 1 to 8. [10] Sliding insert (38) for a driver (18) according to one of claims 1 to 8, wherein the sliding insert (38) can be clipped into a guide area (42) of a rail slider (34) of the driver (18), and has at least one elastically deformable damping element (52) which projects beyond the end face of the rail slider (34) in the clipped-on state.

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