Support device, guide assembly, and equipment for a vehicle
By introducing the first and second support structures and loading devices into the support device, the gapless guidance and stability of the support device in the prior art is solved, and the stability and convenient installation of vehicle spare parts are achieved, ensuring the reliability of the structure and modular features.
Patent Information
- Application Number
- CN202410572464.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-06-14
- Filing Date
- 2024-05-10
- Publication Date
- 2024-12-17
AI Technical Summary
The existing support devices are difficult to guide and install without gaps on the base of vehicle spare parts, and are easily loosened, affecting the user experience and structural stability.
设计了一种支承器件,包含至少一个第一支承结构和第二支承结构,通过加载装置实现与杆的无间隙接触,并通过第三支承部件与支承座的贴靠面配合,确保支承器件在 Stability and reliability in motion and resting states.
The base of the vehicle spare parts is guided and installed without clearance on the rod, avoiding loosening, ensuring structural stability and operation convenience, and supporting modular combined installation.
Smart Images

Figure CN119142233A_ABST
Abstract
Description
Technical Field
[0001] The invention firstly relates to a bearing device comprising at least one bearing structure. Background Art
[0002] Such a support device is known, for example, from a headrest of a vehicle seat. The base of the headrest is provided with two retaining rods which are accommodated in a guide of the backrest. The guide comprises a support device with a bearing structure in contact with the rods. Summary of the invention
[0003] According to a first aspect, the invention is based on the object of providing a support device on which a base of a vehicle equipment part can be guided on a rod movably or immovably without play. It is also the object of the invention to provide a support device that can be mounted in a bearing seat of the base without play. It is also the object of the invention to provide a support device that cannot accidentally come loose from the bearing seat of the base. It is also the object of providing a support device that can be mounted modularly as a structural assembly.
[0004] This object is achieved by a support means having the features of claim 1 .
[0005] The support means is provided with a receiving area in which the rod can be arranged in a relatively movable or immovable manner. The immovable feature in this case means that the support means is not movable relative to the rod in the direction of the longitudinal axis of the rod.
[0006] The cross section of the rod can have all conceivable shapes, for example the rod can be round, oval or polygonal.
[0007] The support device comprises at least one first support structure and a second support structure, wherein each support structure is configured to contact the rod when the rod is located in the receiving area. The support device comprises at least one first support component having a first support structure and having a primary contact surface for cooperating with a first matching surface of a bearing seat, and the support device comprises a second support component having a second support structure.
[0008] At least one region of the second support part is loaded by the loading device in the first direction, so that the rod can be loaded by the second support structure against the first support structure. Thus, a play-free support relative to the rod accommodated in the receiving region can be achieved.
[0009] The support device comprises a third support part having a secondary abutment surface for cooperating with a second mating surface of a support seat, the support seat being arranged to be relatively movable relative to the first support part. The loading device or a separate loading device loads the third support part in a second direction, which is directed opposite to the first direction. In other words, the first support part and the third support part are opened so that the two support parts are in abutment against the wall of the support seat.
[0010] The support device according to the invention can therefore guide the base of the vehicle equipment part on at least one rod movably or immovably without play. In addition, the support device can be mounted in the bearing seat without play, so that no disturbing noise is generated. The support device can be designed so that it cannot accidentally come loose from the bearing seat. Therefore, a reliable support can also be achieved with the support device. The support device can be designed modularly as a structural assembly and thus ensures favorable handling during installation.
[0011] The support means is modularly constructed as a structural assembly and forms, for example, a frame having a support device for accommodating the support means in a support seat. The frame comprises a receiving area and a support structure. For example, the frame is formed by a first and a third support part. The frame can have all suitable external shapes. The frame is, for example, rectangular. The frame, for example, forms a primary contact surface and a secondary contact surface.
[0012] At least one of the supporting structures is designed, for example, as a point bearing, which means that the contact surface with the rod is small. For example, all supporting structures are designed so that they have minimal contact with the rod. In the case of a round rod, a point bearing is automatically produced in the interaction with a linearly designed supporting structure. If the rod is not round, but angular, and flat surfaces are formed between the corners, the supporting structure is formed, for example, by a raised surface, so that a point bearing is also produced.
[0013] The third support part and the first support part are guided, for example, so as to be movable relative to each other. The first support part and the third support part form, for example, a frame. By movably guiding the third support part on the first support part, for example, a module is produced, which can be installed in the support seat as a structural assembly. If the first support part is movably guided on the third support part, the support size can be changed on a scale, and the support device can be changed in its length, for example, in order to install or remove it in the support seat. The change in length, for example shortening, can be carried out against the spring force. After the length change, the first support part and the third support part are against the surface of the support seat due to the restoring force of the spring mechanism.
[0014] The third support part has, for example, a stop surface which cooperates with the bearing surface of the first support part to limit the relative movement of the first support part and the third support part. The third support part is limited when moving, for example, in the disassembly direction. In the movement direction opposite to the disassembly direction, the movement is also limited, for example, by the cooperating stop surfaces of the first support part and the third support part. In this way, the first support part and the third support part cannot accidentally detach from each other.
[0015] The stop surface of the third support part is loaded against the seat surface of the first support part, for example, by the loading device or by a separate loading device. That is to say, the third support part can be loaded, for example, by a separate loading device or alternatively by the same loading device that also loads the second part. The seat surface of the first support part is constructed so that as long as the support device is not installed in the support seat, the support device forms a structural assembly and these parts cannot be separated from each other. The loading of the third support part has the following purpose in principle, namely, to hold the third support part on the second mating surface of the support seat without gap. Here, for example, the first support part and the third support part can be loaded separately from each other, so that the two support parts are in contact with the corresponding first mating surface or second mating surface of the support seat without gap.
[0016] The second bearing part is movably guided, for example, in a guide of the first bearing part. The second bearing part comprises at least one bearing structure which is designed to be in contact with the rod.
[0017] The second support part is loaded, for example, indirectly or directly, by a loading device, in particular by a spring, so that it presses the rod against at least one first support structure of the first support part. Since the second support part is movably arranged in the bearing seat, it can compensate for tolerances. The second support part is guided, for example, linearly movably on the first support part.
[0018] The second support part comprises, for example, a stop surface which cooperates with a stop edge of the first support part in order to limit the movement of the second support part. The stop surface is loaded, for example, by a loading device against the stop edge of the first support part. In this case, the stop also serves to fix the relative position of the second support part with respect to the first support part when the support device is not mounted in the support seat. The loading device is arranged to load the second support part against the rod and the rod against the first support part, so that there is no gap between the first support part, the rod and the second support part.
[0019] The loading device comprises, for example, at least one spring. A spring is a simple and cost-effective device for loading. Other suitable loading devices can also be used.
[0020] The support means extends substantially in the first and second spatial directions and has a small extension with respect to the third spatial direction. The support means is designed, for example, as a thin plate. The support means then requires little space in the bearing seat.
[0021] The support means is configured so that the rod center axis located in the recess extends in the region of the support of the rod along a third spatial direction of the support means. Thus, when the support means extends substantially in the first and two spatial directions, the rod that passes through the receiving area extends in the third spatial dimension.
[0022] The second bearing part is designed, for example, in such a way that when the rod is located in the receiving area, the second bearing part is located in the movement path of the third bearing part, so that the bearing means cannot be changed in terms of its dimensions or can only be changed to a very small extent. In this way, in the case of a correspondingly designed bearing seat, an unintentional removal from the bearing seat is not possible when the rod is installed in the receiving area. In other words, the movability of the third bearing part relative to the first bearing part is not sufficient to overcome, for example, undercuts or projections of the bearing seat.
[0023] According to a second aspect of the invention, the invention relates to a guide assembly for a guide rod.
[0024] Reference is made to the prior art mentioned with respect to the first inventive aspect.
[0025] According to a second aspect, the invention is based on the object of providing a guide assembly on which a base of a vehicle equipment part is guided on a rod movably or immovably without play. It is also the object of the invention to provide a guide assembly that can be mounted in a bearing seat of the base without play. It is also the object of the invention to provide a guide assembly that cannot accidentally come loose from the bearing seat of the base.
[0026] This object is achieved by a guide arrangement having the features of claim 9 .
[0027] The guide assembly for the accessory comprises at least one supporting element according to the first aspect of the invention, which can be mounted in a supporting seat of a base. The accessory is, for example, a headrest or an armrest. The supporting element is guided on a rod. At least two supporting elements are guided, for example, on a rod. The rod can be formed by the free end of a bow or by a single rod. The rod is designed, for example, as a profile element.
[0028] With regard to the embodiments and advantages, reference is made to the embodiments of the first aspect of the invention in order to avoid repetition.
[0029] According to a third aspect, the invention relates to a fitting for the interior of a vehicle.
[0030] Such an accessory is, for example, a headrest or an armrest. The accessory comprises a base, which is immovably or movably supported on at least one rod.
[0031] The object of the present invention is to provide a component with a bearing assembly, with which a base can be supported without play. Another object of the present invention is to provide a component, in which a bearing element of the bearing assembly is accommodated without play in a bearing seat of the base. Another object of the present invention is to provide a component with a bearing assembly, in which the bearing element cannot accidentally come loose from the bearing seat. Another object is to provide a bearing element that can be modularly mounted and / or disassembled as a structural assembly.
[0032] This object is achieved by a fitting having the features of claim 12 .
[0033] The accessory comprises a base, which is supported by a guide arrangement according to the second aspect of the invention. The base supports the rod movably or immovably on at least one rod section. The base comprises at least one bearing seat, in which the bearing means according to the first aspect of the invention is arranged. The rod passes through a recess in the receiving area of the bearing means.
[0034] With regard to embodiments and advantages, reference is made to the first and second aspects of the invention, the disclosure of which is fully incorporated into the third aspect.
[0035] At least one bearing seat has, for example, a first retaining device, for example in the form of an undercut, so that the bearing element can be mounted and disassembled in the bearing seat only by changing the size, for example, the length, overcoming the force of the loading device, for example, at least one spring. The length change is performed, for example, by moving the two bearing parts relative to each other. This relative movement is performed, for example, overcoming the restoring force of the loading device. In other words, a smaller installation distance of the bearing seat must be overcome, wherein the dimension of the bearing element is shortened. When the bearing element is located in the bearing seat, the bearing element can again be extended to a greater length on this dimension and abut against the wall of the bearing seat.
[0036] The guide comprises, for example, at least two bearing seats, wherein a first bearing element in a first bearing seat is arranged rotated 180° about a center point relative to a second bearing element in a second bearing seat. The fixed bearing structure can then be held on the rod by the user in accordance with the loading of the accessory so that during the actual loading no movement of the accessory occurs due to the flexibility of the spring.
[0037] In the following description of the drawings, embodiments of the present invention are also described exemplarily with reference to the drawings. Here, for the sake of clarity (even if different embodiments are involved), identical or similar parts or elements or regions are represented by the same reference numerals, partially with lower case letters added.
[0038] Features which have only been described in relation to one embodiment may also be provided in any other embodiment of the invention within the scope of the invention. Such modified embodiments (although they are not shown in the drawings) are also included in the invention.
[0039] All disclosed features are essential to the invention per se. The disclosure of the present application also fully includes the disclosure content of the cited documents and the described prior art devices in the disclosure content, and also for the purpose of including single or multiple features of these documents in one or more claims of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0040] Shows:
[0041] Figure 1 shows a top view of the support device,
[0042] Figure 2 Show according to Figure 1 A view of the support device of the view arrow G in FIG.
[0043] Figure 3 Show according to Figure 1 The cross-sectional view of the cutting line AA in
[0044] Figure 4 Show according to Figure 2 The cross-sectional view of the cutting line BB in
[0045] Figure 5 The base of the accessory part, in the present case a headrest, is shown with two guides for each rod,
[0046] Figure 6 Show according to Figure 5 The cross-sectional view of the cutting line DD in
[0047] Figure 7 Show according to Figure 5 The cross-sectional view of the cutting line CC in
[0048] Figure 8 Show according to Figure 5 The cross-sectional view of the cutting line EE in
[0049] Fig. 9 shows a perspective view of an assembly comprising a guide having two guide assembly bases, wherein each guide assembly comprises a rod and two support means spaced apart from each other,
[0050] Fig.10 Show according to Fig. 9 A front view of the accessory part;
[0051] Fig.11 Show according to Fig.10The cross-section view of the cutting line GG in
[0052] Fig.12 Show according to Fig.10 The cross-sectional view of the cutting line FF in FIG.
[0053] Fig.12a Show Fig.12 The part marked by the dotted circle in
[0054] Fig.13 Show according to Fig.10 The cross-sectional view of the cutting line HH in
[0055] Fig.14 Show according to Fig.13 sectional view along the section line FF in which the first retaining means of the base and the second retaining means of the support means can be seen,
[0056] Fig.15 A perspective view showing a support device from a first viewing angle;
[0057] Fig.16 A perspective view of the support device is shown from a second viewing angle. DETAILED DESCRIPTION
[0058] The support means is denoted as a whole by the reference numeral 10 in the figures.
[0059] The supporting device 10 is based on Figure 1 The invention comprises a first support member 11, a second support member 12 and a third support member 13. The first support member 11 forms a receiving area 14. The receiving area comprises a recess 15, which is formed by the first support member 11 in this example, but the recess can alternatively be formed by at least two support members. In addition, the first support member 11 comprises support structures 16a and 16b. The second support member 12 is guided on the first support member 11 movably in directions x1 and x2 relative to the first support member 11 by means of a guide 43. It is provided with a support structure 17.
[0060] The third support member 13 comprises two arms 19a and 19b, as shown by Figure 2 It can be seen that the two arms are movably guided in the directions x1 and x2 in the recesses 21a and 21b of the first support part 11. The form-fitting element 22 on the first support part 11 ensures that the support device 10 is correctly installed in the support seat and engages in a form-fitting manner in the corresponding recess of the support seat (when the form-fitting element is located in the recess).
[0061] exist Figure 3As can be seen in FIG, the second support member 12 has a radial protrusion with a stop surface 23, whose surface orthogonal line points in the direction x1. In the present example, the protrusion is formed by an annular protrusion, but alternatively, the protrusion may include at least one separate protrusion with a stop surface, which protrudes in the direction x1 / x2 and / or in the direction y1 / y2. The stop surface 23 cooperates with the stop edge 24 of the first support member 11 to limit the movement of the second support member 12 along the direction x1. According to Figure 3 and Figure 4 , the projection 23 rests against the stop edge 24 since no rod is located in the recess 15 .
[0062] exist Figure 4 As can be seen in FIG. 1 , the arms 19a and 19b of the third support member 13 are configured with stop surfaces 25 at the free end regions, which can move in contact with the bearing surface 26 of the first support member 11 to limit the movement of the third support member 13 relative to the first support member 11 in the direction x2. Figure 4 , the stop surface 25 rests on the bearing surface 26, since no rod is located in the recess 15. The third support part 13 can be moved in the direction x1 relative to the first support part 11. In the present example, the bearing surfaces 26 have undercuts, that is, they are slightly inclined, and the stop surface 25 is shaped accordingly to prevent the stop surface 25 from sliding off the bearing surface 26 laterally.
[0063] As in Figure 3 and Figure 4 As can be seen in FIG. 1 , the loading device 18, here a spring, is held on the second support part 12 and the third support part 13 and loads the second support part 12 and the third support part 13 away from each other in opposite directions, wherein the second support part 12 is loaded in the direction x1 and the third support part 13 is loaded in the direction x2. The loading device 18 is held in the spring seat 39 on the first support part 11 and in the spring seat 40 on the second support part 12. Alternatively, a separate loading device 18, in particular a spring, can also be used to load the second support part 12 and to expand the first support part 11 relative to the third support part 13.
[0064] The spring force is transmitted to the first support part 11 via the projection 23 and the stop edge 24. In this way, the first support part 11 and the third support part 13 are spread apart so that the stop surface 25 and the bearing surface 26 are in contact with each other, wherein the support device 10 forms a structural assembly that can be assembled as a unit.
[0065] The first support element 11 comprises a first contact surface 27 and the third support element 13 comprises a second contact surface 28, which therefore bears against the bearing seat without play due to the restoring force of the loading device 18. Figures 1 to 4 The dimensions of the mating surface of the bearing seat that contacts the first abutment surface 27 and the second abutment surface 28 are determined so that when the support device 10 is located in the bearing seat and the loading device 18 is under tension, the stop surface 25 and the support surface 26 are spaced apart from each other.
[0066] exist Figure 5 2 shows a base 29, for example a headrest, which is provided with guides 33a and 33b with a center axis m, which extend in directions z (z1 and z2). The guide 33a includes bearing seats 31a and 32a and the guide 33b includes bearing seats 31b and 32b. Each guide 33a and 33b is designed as a recess, which can be respectively formed by Figure 5 The rod (not shown) passes through. The bearing seats 31a and 32a are located on the opposite end regions of the guide portion 33a, and the bearing seats 31b and 32b are located on the opposite end regions of the guide portion 33b. The base 29 is provided with a contact surface 34, which is a head contact surface in this case.
[0067] Figure 6 The cross-section of the base 29 is shown, wherein the support element 10 is located in the support seats 31a and 32a. The support element 10 in the support seat 31a is mounted with respect to the support element 10 in the support seat 32a, rotated by 180° about the center axis m. In this way, a loading situation is simulated in which the head of the seat occupant is supported on the contact surface 34. In other words, when the force F acts on the contact surface 34, the base 29 is not rotated relative to the support element 10 in the support seat 32a. Figure 6 The rod movement not shown in the figure, because the immovable support structures 16a and 16b are against the rod. In other words, the loading by the user will not cause the support device 12 to move due to the loading of the second support part 12 overcoming the spring force and the user feels the gap.
[0068] according to Figure 7 It can be seen that the first support part 11 is supported with the first contact surface 27 on the surface 41 of the bearing seat 31. The second contact surface 28 of the third support part 13 is supported on the surface 42 of the bearing seat 31. The loading device 18 loads the third part 13 and the second part 12 away from each other. The second part 12 is pressed against the stop edge 24 with the stop surface 23, wherein the second part presses the contact surface 27 against the surface 41.
[0069] The support means 10 is received in the support seat 31 b in the same manner as the support means 10 is received in the support seat 31 a .
[0070] Incorrect installation of the support means 10 is prevented by the support means 10 (here the first component 11) having a form-fitting element 22 which is accommodated in the recess 38 only in a certain installation position and collides with the walls of the bearing seats 31a and 31b or 32a and 32b in other positions.
[0071] exist Figure 8 2 shows two lower bearing blocks 32 a and 32 b which are designed in the same way as the bearing blocks 31 a and 31 b and in which a bearing means 10 is likewise arranged.
[0072] exist Fig. 9 30, here a headrest, is shown in three dimensions, which is provided with two support assemblies 20 according to the invention, which in this case each comprise two support means 10 and each comprise a rod 35a or 35b. The support assemblies 30 comprise a base 29 which forms two guides 33a and 33b (see also Fig.10 The guide portion 33a is provided with supporting seats 31a and 32a, and the guide portion 33b is provided with supporting seats 31b and 32b.
[0073] A support element 10 is accommodated in each of these support seats 31a, 31b, 32a, 32b. The form-fitting element 22 of the support element 10 is accommodated in the recess 38. The guide 33a comprises a rod 35a and the guide 33b comprises a rod 35b. Each rod 35a or 35b passes through the recess 15 of the receiving area 14 of the support element 10. The rods 35a and 35b are connected to each other by means of a crossbar 36. The rods are provided with stoppers 37 in the end region to avoid damage and to prevent the ingress of dirt.
[0074] according to Fig.11 Each support seat 31a, 31b, 32a, 32b has a first retaining device 45, which cooperates with the second retaining device 44 of the support device 10, so that the support device 10 can only be removed from the corresponding support seat 31a, 31b, 32a, 32b when the size of the support device 10 changes due to the first support component 11 and the third support component 13 moving together to overcome the force of the loading device 18.
[0075] The base 29 can be supported on the rod 35 by means of the bearing assembly 20, for example, in a manner adjustable in the directions z1 and z2. For example, a locking device (not shown) can be provided, by means of which the base 29 can be locked in a set position relative to the rods 35a and 35b. The locking device can, for example, have a latching recess in at least one of the rods 35a and 35b and a locking pin fixed to the base, which can be moved between a locked position and a release position, in which the locking pin can be moved into engagement with the latching recess, and in which the locking pin is out of engagement with the recess.
[0076] exist Fig.12 The support seats 31a and 31b can be seen in Fig.13 1 and 2 can be seen in the figure, which contain the bearing element 10. For example, in the bearing element 31a, it can be seen that the rod 35a passes through the recess 15. The rod 35 is pressed against the bearing structures 16a and 16b of the first component 11 by the second bearing part 12 loaded with pressure by the loading device 18. The rod 35a thus rests on all the bearing structures 16a, 16b and 17. In this case, the first bearing part 11 is pressed with its contact surface 27 against the surface 41 of the bearing seat 31a. In addition, the loading device 18 loads the contact surface 28 of the third bearing part 13 against the surface 42 of the bearing seat 31a.
[0077] exist Fig.12 and 12a It can be seen that a distance is formed not only between the stop surface 23 and the stop edge 24, but also between the stop surface 25 and the support surface 26. It can also be seen that the second support part 12 is pressed by the rod 35a in the direction x2 to such an extent that the first support part 11 and the third support part 13 cannot be pressed together, so that the support device 10 cannot accidentally come out of the support seat 31a. The same applies to the support seats 31b as well as 32a and 32b.
Claims
1. A support device (10), comprising a receiving area (14) with a recess (15), in which rods (35a, 35b) are arranged so as to be movable relative to each other, the support device comprising at least one first supporting structure (16a, 16b) and a second supporting structure (17), the first supporting structure and the second supporting structure being configured to contact the rods (35a, 35b) when the rods (35a, 35b) are located in the receiving area (14), characterized in that The support device (10) has at least one first support part (11) with the first support structure and with a primary abutment surface (27) for cooperating with a first matching surface (41) of a support seat (31a, 31b, 32a, 32b), and the support device has a second support part (12) with the second support structure (17), at least one area of the first support part (11) or the second support part (12) is loaded in a first direction (x1) by a loading device, so that the rod (35a, 35b) can be loaded by the second abutment structure The support structure (17) is loaded against the first abutment structure (16a, 16b), wherein the support device (10) includes a third support part (13) having a secondary abutment surface (28) for cooperating with the second mating surface (42) of the support seat (31a, 31b, 32a, 32b), the third support part is arranged to be relatively movable relative to the first support part (11), and the loading device (18) or a separate loading device loads the third support part (13) along a second direction (x2) pointing opposite to the first direction (x1).
2. Support device according to any one of the preceding claims, characterized in that The support device (10) forms a frame having support means for accommodating the support device (10) in support seats (31a, 31b, 32a, 32b).
3. Support device according to any one of the preceding claims, characterized in that The third support member (13) and the first support member (11) are guided so as to be movable relative to each other.
4. Support device according to any one of the preceding claims, characterized in that The second support part (12) is movably guided in a guide (43) of the first support part (11).
5. Support device according to any one of the preceding claims, characterized in that The third support member (13) has a seating surface (24) which cooperates with a stop surface (26) of the first support member (11) to limit the relative movement.
6. Support device according to any one of the preceding claims, characterized in that The second support part (12) has a stop surface (23) which is loaded by the loading device (18) against a stop edge (24) of the first support part (11).
7. Support device according to any one of the preceding claims, characterized in that The loading device (18) comprises at least one spring.
8. Support device according to any one of the preceding claims, characterized in that The support means (10) extends substantially in a first spatial direction (x1, x2) and a second spatial direction (y1, y2) and has a small extension with respect to a third spatial direction (z1, z2).
9. A guide assembly having at least one bearing device according to any one of the preceding claims and having at least one rod.
10. A guide assembly according to any one of the preceding claims, characterised in that The rod center axis (m) extends in the region of the support element in the third spatial direction (z1, z2).
11. Guide assembly according to any one of the preceding claims, characterized in that The second supporting part (12) is configured such that when the rods (35a, 35b) are located in the accommodation area (14), the second supporting part is located in the movement track of the third supporting part (13), so that the supporting device (10) cannot be removed from the supporting seat (31a, 31b, 32a, 32b).
12. A vehicle interior fitting comprising a base (29) which is mounted movably or immovably on at least one rod section, characterized in that: The base (29) comprises at least one guide with at least one bearing seat, and a bearing element is accommodated in each bearing seat, wherein the recess of the bearing element is penetrated by a rod, wherein a guide assembly according to any one of claims 9 to 11 is formed.
13. The accessory according to claim 12, characterized in that The base (29) has at least one support seat (31a, 31b, 32a, 32b), and the support seat (31a, 31b, 32a, 32b) has an undercut, so that the support device (10) can be installed or removed in the support seat (31a, 31b, 32a, 32b) only by a length change that overcomes the force of the loading device (18).
14. The accessory according to claim 12 or 13, characterized in that The guide portion comprises at least two bearing seats, and a first bearing element in a first bearing seat is arranged rotated 180° with respect to a second bearing element in a second bearing seat about a central axis (m).
