Mechanical stretching device of movable zero-wall-leaning seat

Abstract

The utility model discloses a mechanical stretching device of a movable zero-wall seat, which comprises a backrest component, a leg component, a linkage component and a base, the linkage component is hinged on the base, the linkage component is respectively hinged with the backrest component and the leg component, the mechanical stretching device is characterized by further comprising an anti-forward-turning structure, the anti-forward-turning structure comprises an abutting rod, a connecting rod and a connecting rod, one end of the abutting rod is provided with a first connecting point hinged to the base, the other end of the abutting rod is provided with a second connecting point, and a third connecting point is arranged between the first connecting point and the second connecting point. One end of the supporting rod is hinged to the linkage assembly, and the other end of the supporting rod is hinged to the third connecting point; the rolling piece is hinged to the second connecting point, and the rolling piece abuts against the ground when the mechanical stretching device is in the lying posture state; wherein the distance from the first connection point to the third connection point is smaller than the distance from the second connection point to the third connection point. The abutting rod can better balance the force of each part, stable abutting is kept, and forward turning is effectively prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of seat brackets, in particular to a mechanical extension device of a movable zero-wall seat. Background Art

[0002] With the continuous improvement of domestic productivity and social and economic levels, people's quality of life is also improving, and the requirements for home life quality are also increasing. In the furniture market, sofas, rocking chairs, chairs, etc. are important home products, and their functionality, comfort and safety have become the focus of consumers.

[0003] In order to provide a more comfortable lying experience, many existing seat frame designs are equipped with retractable footrests and adjustable backrests. However, when the user stands up from the seat frame in the lying state, the rear part of the seat frame is easily lifted due to the forward shift of the center of gravity, causing the sofa to tip forward. This safety hazard not only affects the user experience, but may also cause physical harm to the user.

[0004] In order to solve the above problems, some devices to prevent seats from tipping forward have appeared on the market. However, in actual applications, these devices are often designed to be relatively concealed due to aesthetic issues, and can only be simply resisted at the front of the seat bracket. The hinge position and size design cannot achieve good stability and cannot effectively meet the needs of consumers. Utility Model Content

[0005] In order to overcome at least one of the defects of the prior art described above, the utility model provides a movable mechanical extension device for a zero-wall seat.

[0006] The technical solution adopted by the utility model to solve the problem is:

[0007] A mechanical extension device for a movable zero-wall chair comprises a backrest assembly, a leg assembly, a linkage assembly and a base, wherein the linkage assembly is hinged on the base, and the linkage assembly is hinged to the backrest assembly and the leg assembly respectively, and also comprises an anti-rollover structure, wherein the anti-rollover structure comprises: a resistance rod, wherein one end of the resistance rod is provided with a first connection point for being hinged to the base, and the other end is provided with a second connection point, and a third connection point is provided between the first connection point and the second connection point; a support rod, wherein one end of the support rod is hinged to the linkage assembly, and the other end is hinged to the third connection point; a rolling element, wherein the rolling element is hinged to the second connection point, and the rolling element is in contact with the ground when the mechanical extension device is in a lying state; wherein the distance from the first connection point to the third connection point is smaller than the distance from the second connection point to the third connection point.

[0008] By adopting the above scheme and designing a sophisticated anti-tilt structure, the problem of the seat tipping forward caused by the user standing up can be effectively prevented. At the same time, since the distance from the first connection point to the third connection point is smaller than the distance from the second connection point to the third connection point, a lever-like structure is formed, in which the interference rod between the first connection point to the third connection point forms a stable lever arm, providing greater stability. When the backrest or leg assembly of the sofa or seat moves, this structure can better balance the power of each part, which means that when the sofa or seat is extended or contracted, the effect of the change in center of gravity on the overall stability is effectively reduced.

[0009] Furthermore, in a lying state, the backrest assembly and the leg assembly move and extend away from the base, and at this time, the ratio of the horizontal distance from the first connection point to the third connection point to the horizontal distance from the second connection point to the third connection point is in the range of 7 to 8:11 to 12.

[0010] By adopting the above solution, the lever structure composed of the resistance rod and the support rod can provide a backward torque to help offset the forward shift of the center of gravity caused by the user standing up, thereby preventing the sofa or seat from tipping forward. At the same time, within this ratio range, stability can be ensured without sacrificing the appearance and comfort of the sofa or seat.

[0011] Furthermore, in the TV posture, the backrest assembly contracts and moves toward the base, and the leg assembly moves and extends away from the base. At this time, the ratio of the horizontal distance from the first connection point to the third connection point to the horizontal distance from the second connection point to the third connection point is in the range of 2 to 3:7 to 8.

[0012] By adopting the above solution, the interference rod can be slightly lifted in the TV posture. At this time, since the seat back does not need to be extended, there is no need to move the center of gravity of the seat forward, that is, there is no need to use the interference rod, and the contraction and storage effect of the interference rod can be achieved.

[0013] Furthermore, in a sitting state, the backrest assembly and the leg assembly shrink and move closer to the base, and at this time, the ratio of the horizontal distance from the first connection point to the third connection point to the horizontal distance from the second connection point to the third connection point is in the range of 2 to 3:1 to 2.

[0014] By adopting the above solution, the resistance rod can be completely retracted in the sitting state, so as to save the overall seat space and improve the aesthetics and practicality.

[0015] Furthermore, the base includes two side panels and a bottom support for connecting the two side panels.

[0016] By adopting the above solution, good support can be provided for the interference rod, the backrest assembly, the linkage assembly and the leg assembly.

[0017] Furthermore, the abutment rod is bent toward the ground to form a bending portion, and the bending portion is located between the second connection point and the third connection point. The abutment rod is provided with an avoidance gap for avoiding the base, and the avoidance gap is located between the first connection point and the third connection point.

[0018] By adopting the above scheme, the bent portion is located between the second connection point and the third connection point, so that the front end of the interference rod can contact the ground faster and transmit the force to the ground more effectively, thereby preventing the seat from tipping forward; the avoidance gap is designed to avoid the base of the seat to ensure that when the seat is extended to a lying position, the interference rod will not interfere with or collide with the base, which not only ensures the normal movement of the seat, but also extends the service life of the interference rod and the base.

[0019] Furthermore, the linkage assembly includes a first active rod, a second active rod and a main body plate hinged to the base, the first active rod and the second active rod are both hinged to the base, one end of the main body plate is hinged to the leg assembly, and the other end is hinged to the backrest assembly, a first connecting rod is connected between the first active rod and the main body plate, a second connecting rod is connected between the second active rod and the main body plate, and a third connecting rod is connected between the first connecting rod and the second connecting rod.

[0020] By adopting the above solution, stable switching between the sitting state, the TV state and the lying state can be achieved.

[0021] Furthermore, the leg assembly includes a first leg rod, a second leg rod, a third leg rod, a fourth leg rod and a footrest, the rear end of the first leg rod is hinged to the main body plate, the front end of the first leg rod is hinged to the rear end of the second leg rod, the rear end of the third leg rod is hinged to the main body plate, the front end of the third leg rod is hinged to the rear end of the fourth leg rod, and the second leg rod and the fourth leg rod are hinged to the footrest at their front ends respectively.

[0022] By adopting the above solution, the leg raising effect or the leg lowering effect can be achieved.

[0023] Furthermore, the backrest assembly includes a backrest connecting rod and a backrest rotating member, the front end of the backrest rotating member is hinged to the main plate, the rear end is hinged to the rear end of the backrest connecting rod, and the front end of the backrest connecting rod is hinged to the second connecting rod.

[0024] By adopting the above solution, the backrest can be made to stand up or lie flat.

[0025] Furthermore, the rolling element is a roller, a drum or a ball.

[0026] By adopting the above solution, rollers, drums or balls are used as rolling elements, which can significantly reduce the friction and resistance between the seat and the ground, maintain stable contact and support with the ground, prevent the seat from tipping forward or shaking due to changes in the center of gravity, and make the seat more smooth and stable when extending.

[0027] In summary, the mechanical extension device of a movable zero-wall seat provided by the utility model has the following technical effects:

[0028] 1. Through the combination of the resistance rod and the support rod, and the carefully designed lever principle, when the user stands up from a lying position, the rear part of the seat can be effectively prevented from lifting and tipping forward due to the forward shift of the center of gravity, thereby greatly improving the safety and stability of the seat;

[0029] 2. Since the distance from the first connection point to the third connection point is smaller than the distance from the second connection point to the third connection point, a lever-like structure is formed, which can better balance the forces of various parts and reduce the impact of the change of the center of gravity on the overall stability, so that the seat can maintain good stability when extending or contracting;

[0030] 3. The design principle and structure of the device are relatively simple, but highly functional and can adapt to seats of different models and sizes to meet various home environments and user needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the structure of the sitting posture of an embodiment of the utility model;

[0032] Figure 2 This is a schematic diagram of the TV posture structure of an embodiment of the utility model;

[0033] Figure 3 This is a schematic diagram of the structure of the lying position of an embodiment of the utility model;

[0034] Figure 4 This is a schematic diagram of a partially dismantled structure of an embodiment of the utility model from a three-dimensional perspective;

[0035] Figure 5 This is a schematic diagram of the structure of the interference rod according to an embodiment of the utility model;

[0036] Figure 6 This is a schematic diagram of the assembly and disassembly structure of the anti-rollover structure of an embodiment of the utility model;

[0037] Figure 7 This is a schematic diagram of the assembly structure of the linkage rod according to an embodiment of the utility model.

[0038] The meanings of the reference numerals are as follows: 1. backrest assembly; 11. backrest connecting rod; 12. backrest rotating member; 2. leg assembly; 21. first leg rod; 22. second leg rod; 23. third leg rod; 231. first auxiliary linkage rod; 232. third auxiliary linkage rod; 24. fourth leg rod; 25. footrest; 3. linkage assembly; 31. first active rod; 311. fifth auxiliary linkage rod; 32. second active rod; 33. main body plate; 331. Second auxiliary linkage rod; 332. Fourth auxiliary linkage rod; 34. First linkage rod; 35. Second linkage rod; 36. Third linkage rod; 4. Base; 41. Side panel; 42. Bottom support; 5. Anti-rollover structure; 51. Resistance rod; 511. First connection point; 512. Second connection point; 513. Third connection point; 514. Bending portion; 515. Avoidance gap; 52. Support rod; 53. Rolling member; 6. Linkage rod. DETAILED DESCRIPTION

[0039] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described and discussed below in conjunction with the accompanying drawings of the present invention. Obviously, what is described here is only a part of the examples of the present invention, not all the examples. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0040] In order to facilitate the understanding of the embodiments of the present utility model, the following will be further explained by taking specific embodiments as examples in conjunction with the drawings, and each embodiment does not constitute a limitation on the embodiments of the present utility model.

[0041] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0043] Embodiment 1 of the present utility model is referred to Figure 1-Figure 7As shown, a mechanical extension device of a movable zero-wall seat is disclosed, including a backrest assembly 1, a leg assembly 2, a linkage assembly 3, a base 4 and an anti-rollover structure 5, wherein the base 4 includes two side panels 41 and a bottom support 42 for connecting the two side panels 41. Preferably, two bottom supports 42 are provided, which are respectively connected to the front and rear ends of the two side panels 41, so as to provide good support for the resistance rod 51, the backrest assembly 1, the linkage assembly 3 and the leg assembly 2, so that the mechanical extension device can stably switch between a lying position, a TV position and a sitting position. Specifically, each side panel 41 is provided with a group of backrest components 1, leg components 2 and linkage components 3, the linkage components 3 are hinged on the base 4, and the linkage components 3 are hinged to the backrest components 1 and the leg components 2 respectively, the anti-rollover structure 5 includes a resistance rod 51, a support rod 52 and a rolling member 53, one end of the resistance rod 51 is provided with a first connection point 511 for being hinged to the base 4, and the other end is provided with a second connection point 512, a third connection point 513 is provided between the first connection point 511 and the second connection point 512, one end of the support rod 52 is hinged to the linkage component 3, and the other end is hinged to the third connection point 513; the rolling member 53, the rolling member 53 is hinged to the second connection point 512, and the rolling member 53 is hinged to the mechanical extension device when it is in a lying state. Ground abutment; wherein, the distance from the first connection point 511 to the third connection point 513 is smaller than the distance from the second connection point 512 to the third connection point 513. By designing an ingenious anti-rollover structure 5, the seat can be effectively prevented from rolling forward due to the user standing up. At the same time, since the distance from the first connection point 511 to the third connection point 513 is smaller than the distance from the second connection point 512 to the third connection point 513, a structure similar to a lever is formed, wherein the abutment rod 51 between the first connection point 511 and the third connection point 513 forms a stable lever arm, providing greater stability. When the backrest or leg assembly 2 of the sofa or seat moves, this structure can better balance the forces of each part, which means that when the sofa or seat is extended or contracted, the influence of the change in center of gravity on the overall stability is effectively reduced.

[0044] Preferably, in order to further clarify the state of the resistance rod 51 in each state, it is described separately. In the lying state, refer to Figure 3As shown, the backrest assembly 1 and the leg assembly 2 move and extend away from the base 4. At this time, the ratio of the horizontal distance from the first connection point 511 to the third connection point 513 to the horizontal distance from the second connection point 512 to the third connection point 513 is 7-8:11-12. Within the above ratio range, the lever structure composed of the resistance rod 51 and the support rod 52 can provide a backward torque to help offset the forward shift of the center of gravity caused by the user standing up, thereby preventing the sofa or seat from tipping forward. At the same time, within this ratio range, the stability can be ensured without sacrificing the appearance and comfort of the sofa or seat. In the TV posture state, refer to Figure 2 As shown, the backrest assembly 1 shrinks and moves toward the base 4, and the leg assembly 2 moves and stretches away from the base 4. At this time, the ratio of the horizontal distance from the first connection point 511 to the third connection point 513 to the horizontal distance from the second connection point 512 to the third connection point 513 is in the range of 2-3:7-8. The interference rod 51 can be slightly lifted in the TV posture state. At this time, since the seat back does not need to be extended, there is no need to move the center of gravity of the seat forward, that is, there is no need to use the interference rod 51, and the contraction and storage effect of the interference rod 51 can be achieved. In the sitting state, refer to Figure 1 As shown, the backrest assembly 1 and the leg assembly 2 are retracted toward the base 4. At this time, the ratio of the horizontal distance from the first connection point 511 to the third connection point 513 to the horizontal distance from the second connection point 512 to the third connection point 513 is in the range of 2 to 3:1 to 2. The resistance rod 51 can be completely retracted in the sitting state to save the overall seat space occupancy and improve the aesthetics and practicality.

[0045] In order to prevent the bottom support 42 from blocking or interfering with the resistance rod 51 when the resistance rod 51 is folded toward the ground, a bending portion 514 is formed when the resistance rod 51 is bent toward the ground, and the bending portion 514 is located between the second connection point 512 and the third connection point 513, and the bending portion 514 is located between the second connection point 512 and the third connection point 513, so that the front end of the resistance rod 51 can contact the ground faster and transmit the force to the ground more effectively, thereby preventing the seat from tipping forward; preferably, in this embodiment 1, an avoidance gap 515 for avoiding the base 4 is provided on the resistance rod 51, and the avoidance gap 515 is located between the first connection point 511 and the third connection point 513. The avoidance gap 515 is designed to avoid the base 4 of the seat to ensure that the resistance rod 51 will not interfere with or collide with the base 4 when the seat is extended to a lying state, which not only ensures the normal movement of the seat, but also prolongs the service life of the resistance rod 51 and the base 4.

[0046] In this embodiment 1, refer to Figure 4As shown, the linkage assembly 3 includes a first active rod 31, a second active rod 32 and a main body plate 33 hinged to the base 4, the first active rod 31 and the second active rod 32 are both hinged to the base 4, one end of the main body plate 33 is hinged to the leg assembly 2, and the other end is hinged to the backrest assembly 1, a first connecting rod 34 is connected between the first active rod 31 and the main body plate 33, a second connecting rod 35 is connected between the second active rod 32 and the main body plate 33, and a third connecting rod 36 is connected between the first connecting rod 34 and the second connecting rod 35. The leg assembly 2 includes a first leg rod 21, a second leg rod 22, a third leg rod 23, a fourth leg rod 24 and a footrest 25, the rear end of the first leg rod 21 is hinged to the main body plate 33, the front end of the first leg rod 21 is hinged to the rear end of the second leg rod 22, the rear end of the third leg rod 23 is hinged to the main body plate 33, the front end of the third leg rod 23 is hinged to the rear end of the fourth leg rod 24, the second leg rod 22 and the fourth leg rod 24 are hinged to the footrest 25 at their front ends respectively, the backrest assembly 1 includes a backrest connecting rod 11 and a backrest rotating member 12, the front end of the backrest rotating member 12 is hinged to the main body plate 33, and the rear end is hinged to the rear end of the backrest connecting rod 11, the front end of the backrest connecting rod 11 is hinged to the second connecting rod 35, so as to realize the standing up effect or lying flat effect of the backrest.

[0047] It should be noted that in order to enable the leg components 2, linkage components 3 and backrest components 1 on the two side panels 41 to change synchronously, refer to Figure 7 As shown, a linkage rod 6 is provided between the two groups of leg assemblies 2, the linkage assembly 3 and the backrest assembly 1. In this embodiment 1, the linkage rod 6 is provided on the main body plate 33, the first active rod 31 and the second active rod 32.

[0048] In order to further improve the activity stability between the leg assembly 2 and the linkage assembly 3, refer to Figure 3 As shown, a first auxiliary linkage rod 231 and a second auxiliary linkage rod 331 are arranged between the third leg rod 23 and the main body plate 33, and a third auxiliary link rod 232, a fourth auxiliary link rod 332 and a fifth auxiliary link rod 311 are arranged in sequence between the third leg rod 23 and the first active rod 31, wherein the fourth auxiliary link rod 332 is hinged to the main body plate 33. Thus, when the seat posture is converted, the leg assembly 2 is limited, and a more stable linkage drive is achieved.

[0049] Preferably, the rolling element 53 is a roller, a drum or a ball. The roller, a drum or a ball as the rolling element 53 can significantly reduce the friction and resistance between the rolling element 53 and the ground, maintain stable contact and support with the ground, prevent the seat from tipping forward or shaking due to the change of the center of gravity, and make the seat more smooth and stable when extending.

[0050] In summary, the mechanical extension device of a movable zero-wall seat provided by the utility model has the following technical effects:

[0051] 1. Through the combination of the resistance rod 51 and the support rod 52, through the carefully designed lever principle, when the user stands up from a lying position, the rear part of the seat can be effectively prevented from lifting and tipping forward due to the forward shift of the center of gravity, thereby greatly improving the safety and stability of the seat;

[0052] 2. Since the distance between the first connection point 511 and the third connection point 513 is smaller than the distance between the second connection point 512 and the third connection point 513, a lever-like structure is formed, which can better balance the forces of various parts and reduce the influence of the change of the center of gravity on the overall stability, so that the seat can maintain good stability when extending or contracting;

[0053] 3. The design principle and structure of the device are relatively simple, but highly functional and can adapt to seats of different models and sizes to meet various home environments and user needs.

[0054] The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims

1. A mechanical extension device for a movable zero-wall chair, comprising a backrest assembly (1), a leg assembly (2), a linkage assembly (3) and a base (4), wherein the linkage assembly (3) is hinged to the base (4), and the linkage assembly (3) is hinged to the backrest assembly (1) and the leg assembly (2), respectively, characterized in that: It also includes an anti-rollover structure (5), wherein the anti-rollover structure (5) includes: a resistance rod (51), wherein one end of the resistance rod (51) is provided with a first connection point (511) for being hinged to the base (4), and the other end is provided with a second connection point (512), and a third connection point (513) is provided between the first connection point (511) and the second connection point (512); A support rod (52), one end of the support rod (52) is hinged to the linkage assembly (3), and the other end of the support rod (52) is hinged to the third connection point (513); a rolling member (53), the rolling member (53) being hinged to the second connection point (512), the rolling member (53) being in contact with the ground when the mechanical extension device is in a lying position; Wherein, the distance from the first connection point (511) to the third connection point (513) is smaller than the distance from the second connection point (512) to the third connection point (513).

2. The mechanical extension device of a movable zero-wall seat according to claim 1, characterized in that: When in a lying position, the backrest assembly (1) and the leg assembly (2) move and extend in a direction away from the base (4), and at this time, the ratio of the horizontal distance from the first connection point (511) to the third connection point (513) to the horizontal distance from the second connection point (512) to the third connection point (513) is in the range of 7 to 8:11 to 12.

3. The mechanical extension device of a movable zero-wall chair according to claim 1, characterized in that: In the TV posture state, the backrest assembly (1) contracts and moves toward the base (4), and the leg assembly (2) moves and stretches away from the base (4). At this time, the ratio of the horizontal distance from the first connection point (511) to the third connection point (513) to the horizontal distance from the second connection point (512) to the third connection point (513) is in the range of 2 to 3:7 to 8.

4. The mechanical extension device of a movable zero-wall chair according to claim 3, characterized in that: When in a sitting state, the backrest assembly (1) and the leg assembly (2) are retracted and brought closer to the base (4), and at this time, the ratio of the horizontal distance from the first connection point (511) to the third connection point (513) to the horizontal distance from the second connection point (512) to the third connection point (513) is in the range of 2 to 3:1 to 2.

5. The mechanical extension device of a movable zero-wall chair according to claim 1, characterized in that: The base (4) comprises two side plates (41) and a bottom support (42) for connecting the two side plates (41).

6. The mechanical extension device of a movable zero-wall chair according to claim 1, characterized in that: The abutment rod (51) is bent toward the ground to form a bent portion (514), and the bent portion (514) is located between the second connection point (512) and the third connection point (513). The abutment rod (51) is provided with an avoidance notch (515) for avoiding the base (4), and the avoidance notch (515) is located between the first connection point (511) and the third connection point (513).

7. The mechanical extension device of a movable zero-wall chair according to claim 1, characterized in that: The linkage assembly (3) comprises a first active rod (31), a second active rod (32) and a main body plate (33) which are hinged to the base (4); the first active rod (31) and the second active rod (32) are both hinged to the base (4); one end of the main body plate (33) is hinged to the leg assembly (2) and the other end is hinged to the backrest assembly (1); a first connecting rod (34) is connected between the first active rod (31) and the main body plate (33); a second connecting rod (35) is connected between the second active rod (32) and the main body plate (33); and a third connecting rod (36) is connected between the first connecting rod (34) and the second connecting rod (35).

8. The mechanical extension device of a movable zero-wall chair according to claim 7, characterized in that: The leg assembly (2) comprises a first leg rod (21), a second leg rod (22), a third leg rod (23), a fourth leg rod (24) and a footrest (25); the rear end of the first leg rod (21) is hinged to the main body plate (33); the front end of the first leg rod (21) is hinged to the rear end of the second leg rod (22); the rear end of the third leg rod (23) is hinged to the main body plate (33); the front end of the third leg rod (23) is hinged to the rear end of the fourth leg rod (24); the second leg rod (22) and the fourth leg rod (24) are respectively hinged to the footrest (25) at their front ends.

9. The mechanical extension device of a movable zero-wall chair according to claim 8, characterized in that: The backrest assembly (1) comprises a backrest connecting rod (11) and a backrest rotating member (12); the front end of the backrest rotating member (12) is hinged to the main body plate (33), and the rear end is hinged to the rear end of the backrest connecting rod (11); the front end of the backrest connecting rod (11) is hinged to the second connecting rod (35).

10. The mechanical extension device of a movable zero-wall chair according to claim 1, characterized in that: The rolling element (53) is a roller, a drum or a ball.

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