COVER, RAIL WITH A COVER AND VEHICLE SEAT

Abstract

The invention relates to a cover (120) for a rail element (116) of a longitudinal adjustment device (110), comprising at least one support (120.1), wherein the support (120.1) is designed as a plastic profile in which a plurality of clips (120.2) are integrated, which are spaced apart from each other in the longitudinal extent of the plastic profile and each is designed as a pivot wedge (120.2.2). The invention also relates to a rail element (116) and a vehicle.

Description

[0001] The invention relates to a cover for a rail, a rail with such a cover, and a vehicle seat with a longitudinal adjustment device and a rail with a cover. State of the art

[0002] From DE 10 2016 224 588 A1, a longitudinal adjuster with a rail assembly is known, comprising a lower rail and an upper rail which is movably connected to the lower rail. A cover (for example, a rubber cover, a brush cover, and so on) is further disclosed, which is connected to an outer profile of the lower rail and which is arranged such that it covers at least part of an inner profile. Task

[0003] The invention is based on the objective of providing an improved cover of the type mentioned above, in particular a cover that is easy to mount and securely fixable for a rail, a rail with such an improved cover and a corresponding vehicle seat. Solution

[0004] The first problem is solved according to the invention by the features of claim 1. The second problem is solved according to the invention by the features of claim 10. The third problem is solved according to the invention by the features of claim 13.

[0005] The first-mentioned problem is solved according to the invention by a cover for a rail element (also called a rail), wherein the cover (also called a rail cover) comprises at least one support, which is designed as a plastic profile into which a plurality of clips are integrated, spaced apart from one another along the longitudinal extent of the support. The respective clip is designed as a pivot wedge.

[0006] Because the carrier is designed as a plastic profile, the cover can be manufactured in a simple tool, especially a plastic casting tool, with less material usage and lower profile tolerances, while also incorporating integrated locking elements designed as clips.

[0007] The clips can be side clips. In this case, the plastic profile can be attached laterally to a rail element or rail using clip connections. This allows the support, also called a plastic carrier, to be attached to only one side of the rail element, for example, a bottom rail. Depending on the length of the rail element, several of these supports can be attached one behind the other and to both sides of the rail element.

[0008] This eliminates the need for a conventional cover that wraps around the rail element from one side to the other, beneath the rail element, such as the bottom rail. Such a cover requires more installation space, is more complex to install, and is prone to tolerance issues.

[0009] The respective clip can have at least one undercut, which is designed in particular as a pivot wedge.

[0010] The respective clip can be pivotable about a pivot point. The pivot point can be arranged by a movable, in particular hinged, wedge section of the swivel wedge.

[0011] The clip can be pre-tensioned in a direction perpendicular to its longitudinal extension. The clip can be designed to be elastic and / or reversibly flexible.

[0012] Each clip can be pre-tensioned by the elasticity of the carrier's plastic in a direction perpendicular to its longitudinal expansion. This allows the clips to be held pressed against the rail element. The plastic profile can be positioned or arranged on the rail element without play. Furthermore, automatic locking of the clips, and thus of the carrier, to the rail element can be ensured.

[0013] Each clip can be pivoted about a longitudinally oriented axis of rotation.

[0014] Each clip can have at least one locking contour. This locking contour can be designed as a wedge-shaped surface at a free arm end of the clip.

[0015] The plastic profile can have multiple cutouts spaced apart along its length. Each cutout can be assigned a clip. In particular, the respective pivot wedge can be formed by cutting or punching out a surface in the plastic profile.

[0016] Each clip can be positioned protruding from one side of the cutout. This clip can be connected to the cutout on that side, forming the pivot point. This allows for the simple creation of a one-piece plastic carrier with integrated clips.

[0017] The plastic profile can have multiple recesses for a locking plate of the longitudinal adjustment device, in particular for receiving locking lugs, and / or for mounting a cover plate. The clips and the recesses can be arranged alternately along the length of the plastic profile.

[0018] The plastic profile can have at least one undercut. The undercut can be spaced apart from the clips. The undercut can be substantially parallel to the clips. The undercut can be designed to hold the plastic profile to the rail element, for example, against forces that may act in the transverse direction of the rail element.

[0019] The undercut can be formed by suitable deformation, in particular by bending, at a free leg end of the plastic profile.

[0020] The plastic profile can have a first leg section and a second leg section connected to the first leg section and projecting vertically. The undercut can be formed at a free end of the first leg section. The majority of the clips can be integrated into or formed in the second leg section.

[0021] The plastic profile can be essentially J-shaped. Alternatively, the plastic profile can be essentially L-shaped.

[0022] The plastic profile can have a second leg section that is longer relative to the first leg section. The shape of the plastic profile corresponds to a conventional side flank shape of a bottom rail. Such a bottom rail can, for example, have a rail base with two vertically projecting rail legs, whereby the rail legs can each be bent inwards at their free ends. Each rail leg is also called a side flank.

[0023] The plastic profile can have a shape corresponding to the respective rail leg. Thanks to the undercut and the side clips, the plastic profile can be attached to the rail element in a largely form-fitting manner.

[0024] The plastic profile can have a first leg section extending continuously along its length. Several second leg sections can project from the first leg section. The leg sections can be spaced apart from each other along their length. Each leg section can have at least one clip or several clips. Alternatively, the plastic profile can have a second leg section that extends continuously along its length.

[0025] The plastic profile may have a continuous undercut extending along its length. The undercut may be interrupted.

[0026] The second problem is solved according to the invention by a rail element (also called a rail), in particular by a lower rail of a longitudinal adjustment unit (also called longitudinal adjustment device), wherein the rail comprises the cover described above and has a number of through-openings along its longitudinal extent, which are formed corresponding to the clips.

[0027] The rail element, in particular the bottom rail, can comprise at least one rail base and two rail legs projecting perpendicularly from it. At least one cover can be arranged, and in particular attached, to at least one of the rail legs.

[0028] For example, the respective clip can be engaged in a self-locking engagement in the corresponding through-opening by means of the rotating wedge. In particular, the respective clip can be brought into such a self-locking engagement in the corresponding through-opening by means of the rotating wedge that pulling, especially a tensile force, on a free end of the cover does not cause the self-locking engagement to open. For example, the cover can be arranged on the rail in such a way that it can pivot about a predetermined pivot point of the rotating wedge.

[0029] The rail leg can have a free leg end, with the undercut of the cover, when installed, encompassing or engaging behind this free leg end. This prevents the cover, and in particular the support designed as a plastic profile, from moving laterally away from the rail element. The support can be held on the rail element with virtually no play. The support can withstand forces in all directions during operation.

[0030] Additionally, the cover can include a fascia that can be detachably attached to the support. The fascia can be an optical cover. For example, the lower rail can be positioned below the vehicle's floor surface. The fascia can conceal an opening in the vehicle floor. The fascia can be attached to the support via connecting elements. The fascia can have connecting elements that snap into recesses in the support. In a further embodiment, the fascia can be designed to cover a rail opening between the rail legs of the lower rail.

[0031] The third problem mentioned above is solved according to the invention by a vehicle seat comprising a longitudinal adjustment unit which includes the rail with cover described above.

[0032] Advantageous configurations, which can be used individually or in combination, are described below. Figures and embodiments of the invention

[0033] The invention is explained in more detail below with reference to advantageous embodiments illustrated in the figures. However, the invention is not limited to these embodiments. The figures show: Fig. 1: schematic representation of a vehicle seat with a longitudinal adjustment device, Fig. 2: A perspective view of a rail with a double-sided cover, Fig. 3: A perspective view of a rail with a one-sided cover, Fig. 4: an enlarged section of the perspective view of the rail in the area of ​​a coupling between rail and cover, Fig. 5: a cross-sectional view of the Fig. 4 in the area of ​​the coupling of rail and cover, Fig. 6: A front view of the rail with the double-sided cover, and Fig. 7: a cross-sectional view of the Fig. 6 in the area of ​​the coupling of the rail and both covers.

[0034] Corresponding parts are marked with the same reference symbols in all figures.

[0035] One in the Fig. A vehicle seat 100, schematically depicted in relation to the prior art, is described below using three mutually perpendicular spatial directions. A longitudinal direction x of a vehicle seat 100 installed in a vehicle runs largely horizontally and preferably parallel to a longitudinal direction of the vehicle, corresponding to the vehicle's usual direction of travel. A transverse direction y, perpendicular to the longitudinal direction x, is also horizontally oriented in the vehicle and runs parallel to a transverse direction of the vehicle. A vertical direction z runs perpendicular to the longitudinal direction x and perpendicular to the transverse direction y. In a vehicle seat 100 installed in a vehicle, the vertical direction z preferably runs parallel to a vertical axis of the vehicle.

[0036] The position and direction designations used, such as front, rear, top, and bottom, refer to the viewing direction of an occupant seated in vehicle seat 100 in a normal seating position, whereby the vehicle seat 100 is installed in the vehicle, in a suitable position for passenger transport with the backrest 104 upright, and oriented in the direction of travel as usual. However, the vehicle seat 100 can also be installed or moved in a different orientation, for example, transversely to the direction of travel. Unless otherwise described, the vehicle seat 100 is designed to be mirror-symmetrical about a plane perpendicular to the transverse direction y.

[0037] The backrest 104 can be pivotally mounted on a seat section 102 of the vehicle seat 100. For this purpose, the vehicle seat 100 can optionally include a fitting 106, in particular an adjustment fitting, swivel fitting, locking fitting or wobble fitting.

[0038] The position and direction specifications used, such as radial, axial, and circumferential, refer to a rotation axis 108 of the fitting 106. Radial means perpendicular to the rotation axis 108. Axial means in the direction of or parallel to the rotation axis 108.

[0039] The vehicle seat 100 can optionally include a longitudinal adjustment device 110 (also called a longitudinal adjustment unit). The longitudinal adjustment device 110 comprises, for example, a rail arrangement 112 with a first rail element 114 and a second rail element 116. The first rail element 114 is adjustable in the longitudinal direction x relative to the second rail element 116. The first rail element 114 is attached to the seat part 102. The second rail element 116 is attached to a structural element of a vehicle, for example, a vehicle floor.

[0040] For clarity, the first rail element 114 will be referred to as the upper rail 114 in the following description. This upper rail 114 (also called running rail or carriage) is assigned to and designed to support the vehicle seat 100. The second rail element 116 will be referred to as the lower rail 116. The lower rail 116 is fixed and connected, for example, to the floor of a vehicle or another suitable vehicle structure.

[0041] The rail arrangement 112 can have at least one cover 120.

[0042] Fig. Figure 2 shows a perspective view of a bottom rail 116 with a double-sided cover 120.

[0043] The bottom rail 116 is designed, in particular, as a profile component, especially a metal profile component. The bottom rail 116 can, for example, be a U-shaped profile component with a rail base 116.1, from which two rail legs 116.2 extend vertically upwards. The free leg ends 116.3 can additionally be bent inwards in a U-shape.

[0044] The bottom rail 116 can include a cover 120 (also called rail cover) on each rail leg 116.2.

[0045] Each cover 120 includes at least one carrier 120.1, which is designed as a plastic profile.

[0046] In the respective carrier 120.1, in Fig. 2, which can only be seen on the front / right carrier 120.1, has a plurality of clips 120.2 integrated along its longitudinal extent (in longitudinal direction x).

[0047] The clips 120.2 are spaced apart from each other in their longitudinal extent and inserted into the associated carrier 120.1.

[0048] Because the respective carrier 120.1 is designed as a plastic profile, the cover 120 can be manufactured in a simple tool, in particular in a plastic casting tool with less material usage and lower profile tolerances.

[0049] The SUnterschiene 116 includes a number of through openings 116.4 for attaching and fixing the respective carrier 120.1 along its longitudinal extent, which are designed to correspond to the clips 120.2.

[0050] The clips 120.2 can be integrated into the carrier 120.1 at regular intervals. The bottom rail 116 has at least one or more through-openings 116.4 corresponding to the number of clips 120.2.

[0051] The respective support 120.1 is designed as an L-profile or J-profile. The clips 120.2 are integrated into the second leg section 120.3 of the respective support 120.1, which, in the assembled state, rests against the associated rail leg 116.2.

[0052] The clips 120.2 extend from the carrier 120.1 towards the rail legs 116.2 and engage in the associated through-opening 116.4. The clips 120.2 can, for example, be designed as spring-loaded tabs or tongues.

[0053] The clips 120.2 can be integrated into the carrier 120.1 as punched sections or the like.

[0054] The leg section 120.3 can also include recesses 120.4. The recesses 120.4 can be configured as passages 120.4.1 and / or as cutouts 120.4.2, in particular as rest recesses.

[0055] The clips 120.2 and the recesses 120.4 can be integrated alternately into the leg section 120.3, viewed in the longitudinal direction x. For example, the clips 120.2 and the recesses 120.4 can be integrated at equal intervals from each other in the second leg section 120.3.

[0056] The plastic profile comprises a first leg section 120.6 and a second leg section 120.3 connected to the first leg section 120.6 and projecting vertically downwards. An undercut 120.2.1 is formed at a free leg end 120.6.1 of the first leg section 120.6. The majority of the clips 120.2 are integrated into the second leg section 120.3.

[0057] In other words, the plastic profile is essentially J-shaped and includes a plurality of clips 120.2 on one side and at least one undercut 120.2.1 on the opposite side.

[0058] The undercut 120.2.1 of the plastic profile surrounds or engages behind the free leg end 116.3 in the assembled state.

[0059] Fig. Figure 3 shows a perspective view of the rail designed as a bottom rail 116 with a one-sided cover 120. The front / right cover 120 has been omitted to better illustrate the through-openings 116.4 in the rail leg 116.2.

[0060] Fig. Figure 4 shows an enlarged section of the perspective view of the rail designed as a bottom rail 116 in the area of ​​a coupling of bottom rail 116 and cover 120 by means of the clips 120.2 of the carrier 120.1 and the through openings 116.4 in the bottom rail 116.

[0061] Each clip 120.2 has at least one undercut 120.2.1 and one pivot wedge 120.2.2.

[0062] For example, the respective clip 120.2 can be engaged by means of the rotating wedge 120.2.2 in a self-locking engagement 122 in the associated through-opening 116.4, in particular at an upper edge 116.4.1 (= upper edge of the opening).

[0063] The undercut 120.2.1 prevents the cover 120 from rotating around a contact point 204 of the pivot wedge 120.2.2 at the upper edge 116.4.1.

[0064] In other words, when assembled, the respective clip 120.2 is engaged in a self-locking engagement 122 in the associated through-opening 116.4 by means of the pivot wedge 120.2.2, such that a predetermined pull according to arrow 200 at a free end 120.5 of the cover 120 does not cause the self-locking engagement 122 to open. The clip 120.2 is designed, for example, as a spring clip or a spring arm. The pivot wedge 120.2.2 is designed, for example, at the free arm end 120.2.4 as a locking contour 120.2.3, in particular as a wedge surface, or is designed, for example, as a ramp or the like.

[0065] During the assembly of the support 120.1 on the rail leg 116.2, the clip 120.2 engages radially into the through-opening 116.4 and thus into a wall of the rail leg 116.2 and enters the self-locking engagement 122, in particular by friction and / or force engagement, at the upper edge 116.4.1, so that the lower rail 116 and the cover 120 are fixed together against slipping or twisting.

[0066] In particular, the cover 120 is arranged on the lower rail 116 such that it can pivot about a predetermined pivot point 202 of the pivot wedge 120.2.2, and that when an attempt is made to detach it from the connection on the lower rail 116, for example by pulling in the direction of arrow 200, the cover 120 moves at least at one point, in particular over a length along a line at the contact points 208.1, 208.2 (shown in Fig. 5), supports. This at least one support point 208.1, 208.2 or line (entire support 120.1 (= plastic support)) can be considered a pivot point or axis of rotation. The undercut 120.2.1 prevents this rotation around this pivot point or axis of rotation.

[0067] Each clip 120.2 is pivotally mounted about the pivot point 202. Each clip 120.2 is pre-tensioned in a direction 210 perpendicular to its longitudinal extent.

[0068] The plastic profile comprises a plurality of cutouts 120.2.5. The pivot wedges 120.2.2 can be integrally formed on the plastic profile through the cutouts 120.2.5. The cutouts 120.2.5 are spaced apart longitudinally. Each cutout 120.2.5 is associated with a clip 120.2. The respective clip 120.2 projects from one side 120.2.6 of the cutout 120.2.5. Due to the elasticity of the plastic in the area where the respective pivot wedge 120.2.2 connects to the side 120.2.6 of the respective cutout 120.2.5, the respective pivot wedge 120.2.2 can be pre-tensioned. The respective pivot wedge 120.2.2 presses in the direction indicated by arrow 210.

[0069] Fig. 5 shows a cross-sectional view of the Fig. 4 in the area of ​​coupling of sub-rail 116 and cover 120 in the form of the clip connection and the holding function.

[0070] The at least one clip 120.2 is arranged in such a way that a pull upwards in the direction of arrow 200, in the vertical direction +z, cannot lead to an opening of the clip connection.

[0071] The clip 120.2 comprises the pivot wedge 120.2.2, which forms the locking contour 120.2.3. The pivot wedge 120.2.2 is rotatable about the pivot point 202. When the tool is released, the clip 120.2 is positioned in the transverse direction +y. During assembly, this position of the clip 120.2 can be changed or altered via contact, in particular the self-locking engagement 122, with the upper edge 116.4.1 of the through-hole 116.4 at the contact point 204.

[0072] For example, if the through-hole 116.4 is shifted upwards due to tolerances, the contact point 204 may be located further in the transverse direction +y, and if the through-hole 116.4 is positioned in the opposite direction, it may be located further in the transverse direction -y. This contact point 204 does not change its position in the vertical direction z when its position changes due to tolerances. However, the clip 120.2 itself changes its position in the transverse direction y as described.

[0073] The locking contour 120.2.3 is designed as a pivot wedge 120.2.2, which can be pivoted about the pivot point 202. Due to the elasticity of the plastic of the cover 120, this pivot wedge 120.2.2 is always pressed against the upper edge 116.4.1 (= upper edge) of the through-opening 116.4 (also called hole pattern). Thus, the cover 120 (also called cover plate) is free of play in the vertical direction +z.

[0074] If one now attempts to lift the cover 120 in the vertical direction +z according to arrow 200, the clip 120.2 will not open, as the pivot wedge 120.2.2 is self-locking. One locking direction is indicated by an arrow R1.

[0075] If someone attempts to move the cover 120, in particular the support 120.1, laterally in the direction of arrow 206, this is prevented by the undercut 120.2.1 to the profile. A direction of resistance is indicated by an arrow R2. This means that, when a force is applied in the direction of arrow 206, the support 120.1, designed as a plastic carrier, rests against the bottom rail 116 at a first contact point 208.1 and a second contact point 208.2. The first contact point 208.1 and the second contact point 208.2 are formed on opposite outer sides of the rail leg 116.2.

[0076] An imaginary rotation around the first attachment point 208.1 is not possible, since the second attachment point 208.2 cannot move along the rail contour because the clip 120.2 at the contact point 204 on the upper edge 116.4.1 of the through opening 116.4 prevents any movement in the vertical direction z.

[0077] Fig. Figure 6 shows a front view of the lower rail 116 with the double-sided cover 120. A corresponding cover 120 is arranged on each rail leg 116.2, which, as described above, is secured by a plurality of clips 120.2 (shown in Figure 6). Fig. 5) is held self-locking on the rail legs 116.2 and fixed without play in the vertical direction z.

[0078] Fig. Figure 7 shows a cross-sectional view of the Fig. 6 in the area of ​​the coupling of the lower rail 116 and the two covers 120 by means of the clips 120.2 which are in the through-openings 116.4 of the lower rail 116 in self-locking engagement 122.

[0079] The respective cover 120 can optionally include a cover 124, in particular a T-shaped plastic cover.

[0080] The aperture 124 can in turn be detachably connected to the carrier 120.1, which is designed as a plastic carrier, via further clip connections and guides not shown in detail.

[0081] A coil spring (not shown) can be provided to cover a rail opening 116.5 formed between the two rail legs 116.2. A guide 126 is formed between the cover 124 and the support 120.1 adjacent to the rail opening 116.5 to guide the coil spring, in particular a leaf spring. A lower surface 124.1 of the cover forms an upper sliding surface or guide surface, and a top surface 120.1.1 of the support 120.1 forms a lower sliding surface or guide surface for the coil spring. Reference symbol list 100 vehicle seats 102 Seat section 104 Backrest 106 fittings 108 Rotation axis 110 Longitudinal adjustment device 112 Rail arrangement 114 Rail element, in particular first rail element (top rail) 116 Rail element, in particular second rail element (bottom rail) 116.1 Rail floor 116.2 Tibial plateau 116.3 free thigh end 116.4 Passage opening 116.4.1 Top edge (upper opening edge) 116.5 Rail opening 120 Coverage 120.1 Carrier 120.1.1 Top 120.2 Clip 120.2.1 Undercut 120.2.2 Swivel wedge 120.2.3 Locking contour 120.2.4 free arm end 120.2.5 Excerpt 120.2.6 Page 120.3 second thigh section 120.4 Exclusion 120.4.1 Passage 120.4.2 Excerpt 120.5 free end 120.6 first thigh section 120.6.1 free thigh end 122 self-inhibiting intervention 124 aperture 124.1 Subpage 126 Leadership 200 arrow 202 pivot point 204 Contact point 206 Arrow 208.1 first attachment point 208.2 second attachment point 210 Arrow (Direction) R1, R2 arrow (direction of resistance) x Longitudinal direction y, +y, -y transverse direction z, +z Vertical 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 2016 224 588 A1

[0002]

Claims

[1] Cover (120) for a rail element (116) of a longitudinal adjustment device (110), comprising at least one support (120.1), wherein the support (120.1) is designed as a plastic profile in which a plurality of clips (120.2) are integrated, which are spaced apart from each other in the longitudinal extent of the plastic profile and each is designed as a pivot wedge (120.2.2). [2] Cover (120) according to claim 1, characterized by , that the respective clip (120.2) can be pivoted about a pivot point (202). [3] Cover (120) according to claim 1 or 2, characterized by , that the respective clip (120.2) is pre-tensioned in a direction (210) oriented perpendicular to the longitudinal extent. [4] Cover (120) according to any one of claims 1 to 3, characterized by, that the respective clip (120.2) has at least one locking contour (120.2.3), wherein the respective locking contour (120.2.3) is formed as a wedge surface at a free arm end (120.2.4) of the respective clip (120.2). [5] Cover (120) according to any one of claims 1 to 4, characterized by , that the plastic profile has a plurality of cutouts (120.2.5) which are spaced apart from each other in longitudinal extent. [6] Cover (120) according to claim 5, characterized by , that each cutout (120.2.5) is assigned a clip (120.2), wherein the respective clip (120.2) is arranged protruding from one side (120.2.6) of the cutout (120.2.5). [7] Cover (120) according to any one of claims 1 to 6, characterized by, that the plastic profile has a plurality of recesses (120.4) for a detent plate of the longitudinal adjustment device (110) and / or for a cover attachment of a cover (124), wherein the clips (120.2) and the recesses (120.4) are arranged alternately in the longitudinal extension of the plastic profile. [8] Cover (120) according to any one of claims 1 to 7, characterized by , that the plastic profile has at least one undercut (120.2.1) which is spaced apart from the clips (120.2) and is oriented substantially parallel to them. [9] Cover (120) according to claim 8, characterized by, that the plastic profile has a first leg section (120.6) and a second leg section (120.3) connected to the first leg section (120.6) and projecting vertically, wherein the undercut (120.2.1) is formed at a free leg end (120.6.1) of the first leg section (120.6) and the majority of the clips (120.2) are integrated in the second leg section (120.3). [10] Rail element (116) for a longitudinal adjustment device (110), wherein the rail element (116) comprises at least one rail base (116.1) and two rail legs (116.2) extending perpendicularly from it, as well as at least one cover (120) arranged on one of the two rail legs (116.2) according to one of claims 1 to 9. [11] Rail element (116) according to claim 10, characterized by, that the rail leg (116.2) has a number of through openings (116.4) along its longitudinal extent, which are formed corresponding to the clips (120.2) of the cover (120), wherein the respective clip (120.2) engages in a self-locking action in the associated through opening (116.4). [12] Rail element (116) according to claim 10 or 11, characterized by , that the rail leg (116.2) has a free leg end (116.3), wherein the undercut (120.2.1) of the cover (120) encompasses or engages behind the free leg end (116.3). [13] Vehicle with at least one vehicle seat (100) and a longitudinal adjustment device (110) for longitudinal adjustment of the vehicle seat (100), wherein the longitudinal adjustment device (110) comprises at least one rail arrangement (112) with at least one first rail element (114) and a second rail element (116) according to one of claims 10 to 12.

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