Power handrail

Abstract

The application discloses an electric handrail, which comprises a handrail body, a mounting space arranged in the handrail body, a table plate arranged above the handrail body, and a driving assembly arranged in the mounting space. The driving assembly comprises a driving piece and a transmission piece. The driving piece is rotationally connected with the transmission piece. One end of the transmission piece is rotationally connected with the handrail body, and the other end of the transmission piece is transmissionally connected with the table plate. The other end of the transmission piece is driven by the driving piece to rotate relative to the handrail body. The other end of the transmission piece is transmissionally connected with the table plate. The table plate moves along the front-back direction with the other end of the transmission piece and moves upward relative to the handrail body. The table plate also rotates outward relative to the handrail body. The automatic folding and unfolding of the table plate are realized, and the convenience of the electric handrail is improved.

Description

Technical Field

[0001] This invention relates to the field of vehicle handrail technology, and in particular to an electric handrail. Background Technology

[0002] With the development of automotive intelligence, car interior components are becoming increasingly intelligent, and their functions greatly facilitate the use of drivers and passengers. Armrests with folding tray tables can be highly integrated into the car's interior, satisfying passengers' needs for work and entertainment without compromising aesthetics, while also enhancing the overall luxurious feel of the vehicle. This has made it a competitive area among automakers. However, most current armrest folding tray tables are manually or semi-automatically operated, providing convenience but not necessarily ease of use.

[0003] In related technologies, the armrest box trays are mostly manually operated, meaning they need to be manually pulled out from the armrest box and manually folded to a horizontal position. Some also require manual rotation, making the operation complicated with many steps. Some products only achieve partial electric operation, with the electric motor extending from the armrest box, but the remaining operations still require manual operation. There are no fully automated products, making it very inconvenient for passengers to use. Summary of the Invention

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes an electric handrail in which a driving component drives the other end of a transmission component to rotate relative to the handrail body. The other end of the transmission component is connected to a tabletop, so that the tabletop moves upward relative to the handrail body while moving along the front-back direction with the other end of the transmission component, and the tabletop also rotates outward relative to the handrail body, realizing the automatic folding and unfolding of the tabletop and improving the convenience of the electric handrail.

[0005] An electric handrail according to an embodiment of the present invention includes: a handrail body having an installation space therein; a tabletop disposed above the handrail body; and a drive assembly disposed within the installation space. The drive assembly includes a drive member and a transmission member, the drive member being rotatably connected to the transmission member, one end of the transmission member being rotatably connected to the handrail body and the other end being drively connected to the tabletop. The drive member drives the other end of the transmission member to rotate relative to the handrail body, so that the tabletop moves upward while rotating relative to the handrail body.

[0006] According to an embodiment of the present invention, in the electric handrail, the driving member drives the other end of the transmission member to rotate relative to the handrail body. The other end of the transmission member is connected to the tabletop. As the tabletop moves along the front-back direction with the other end of the transmission member, it moves upward relative to the handrail body and rotates outward relative to the handrail body, thereby realizing the automatic folding and unfolding of the tabletop and improving the convenience of the electric handrail.

[0007] According to some embodiments of the present invention, the drive assembly includes: an adjusting rod, one end of which is rotatably connected to the handrail body and the other end of which is rotatably connected to the transmission member, the drive member adjusting the length of the adjusting rod to cause the transmission member to rotate relative to the handrail body.

[0008] According to some embodiments of the present invention, the drive assembly further includes: a connecting rod extending in a left-right direction, the connecting rod being rotatably connected to the upper side of the transmission member at both ends in the left-right direction, the connecting rod being drively connected to the tabletop so that the tabletop moves back and forth with the transmission member.

[0009] According to some embodiments of the present invention, the electric handrail further includes a retaining assembly, the retaining assembly including a first rod and a second rod, the first rod being rotatably connected to the handrail body, one end of the second rod being fixedly connected to the first rod and the other end being connected to the connecting rod, and one end of the adjusting rod being rotatably connected to the first rod.

[0010] According to some embodiments of the present invention, the connecting rod includes: a shaft portion and a bent rod portion, one end of the shaft portion and the bent rod portion are fixedly connected, the shaft portion is connected to the transmission member and is rotatable relative to the transmission member, the bent rod portion is bent backward, and the other end of the bent rod portion is rotatably connected to the other end of the second rod.

[0011] According to some embodiments of the present invention, the transmission component includes: two extension rods and a first crossbar, the two extension rods being rotatably connected to the inner wall of the mounting space, the first crossbar being connected between the two extension rods, and the other end of the adjusting rod being rotatably connected to the first crossbar.

[0012] According to some embodiments of the present invention, the installation space is provided with two first shaft holes and two second shaft holes, the first shaft holes are located behind the second shaft holes, the retaining assembly is rotatably connected to the two first shaft holes, and one end of the two extension rods is rotatably connected to the two second shaft holes respectively.

[0013] According to some embodiments of the present invention, the connecting rod includes: a shaft portion and a bent rod portion, one end of the shaft portion and the bent rod portion are fixedly connected, and the length of the bent rod portion is equal to the distance between the first shaft hole and the second shaft hole.

[0014] According to some embodiments of the present invention, the armrest body is provided with two installation spaces, the two installation spaces are symmetrically arranged, there are two tabletops, there are two drive components, and the two drive components respectively drive the two tabletops to move in the front-back direction while rotating relative to the armrest body.

[0015] According to some embodiments of the present invention, a first gear portion is connected to the tabletop, and a second gear portion is provided on the transmission member, wherein the first gear portion and the second gear portion mesh with each other.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 This is a schematic diagram of the electric handrail in the closed position according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the electric handrail in the unfolded position according to an embodiment of the present invention;

[0020] Figure 3 This is an exploded view of an electric handrail according to an embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the tabletop and drive assembly in the closed position according to an embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the connection of two tabletops in different states according to an embodiment of the present invention;

[0023] Figure 6 This is a side view of two tabletops in different states according to an embodiment of the present invention.

[0024] Figure label:

[0025] 100. Electric handrails;

[0026] 10. Handrail body; 11. Installation space; 111. First shaft hole; 112. Second shaft hole;

[0027] 20. Tabletop; 21. First gear section; 22. Clearance section;

[0028] 30. Drive assembly; 31. Transmission component; 311. Second gear section; 312. Extension rod; 313. First crossbar; 314. Second crossbar; 32. Adjusting rod; 33. Connecting rod; 331. Shaft section; 332. Bent rod section;

[0029] 40. Holding component; 41. First lever; 42. Second lever. Detailed Implementation

[0030] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0031] The following is for reference. Figures 1-6 An electric handrail 100 according to an embodiment of the present invention is described.

[0032] Combination Figures 1-2 As shown, the electric armrest 100 includes an armrest body 10, a table 20, and a drive assembly 30. The electric armrest 100 is located in the rear seat area of ​​the vehicle compartment. The armrest body 10 has an installation space 11. The table 20 is located above the armrest body 10 and selectively covers the installation space 11. A cup holder is provided on the table 20. The drive assembly 30 drives the table 20 to rotate for user convenience.

[0033] The drive assembly 30 is disposed within the installation space 11. The drive assembly 30 includes a drive component and a transmission component 31, which are rotatably connected. One end of the transmission component 31 is rotatably connected to the armrest body 10. Specifically, the drive assembly 30 is disposed within the installation space 11 so that it can drive the tabletop 20 to rotate relative to the armrest body 10, facilitating user operation. The drive component and transmission component 31 are drively connected, with the drive component driving the transmission component 31 to move. The transmission component 31 is connected between the armrest body 10 and the tabletop 20, and is rotatably connected to the armrest body 10. When the transmission component 31 rotates relative to the armrest body 10, the tabletop 20, which is drively connected to the transmission component 31, flips and moves accordingly, achieving automatic flipping and unfolding of the tabletop 20.

[0034] The other end of the transmission component 31 is connected to the tabletop 20. The driving component drives the other end of the transmission component 31 to rotate relative to the armrest body 10. The other end of the transmission component 31 rotates in the plane formed by the front-back direction and the height direction, and the tabletop 20 moves with the other end of the transmission component 31 in the front-back direction. Since the first gear part 21 is set in the plane formed by the front-back direction and the height direction, the other end of the transmission component 31 rotates with the transmission component 31, and the tabletop 20 is connected to the armrest body 10, so that the tabletop 20 rotates outward relative to the armrest body 10, thereby completing the automatic unfolding and closing of the tabletop 20. When the other end of the transmission component 31 rotates relative to the armrest body 10, the other end of the transmission component 31 moves upward during the rotation, so that the tabletop 20 moves upward with the other end of the transmission component 31 while rotating relative to the armrest body 10.

[0035] The table 20 has a closed position and an unfolded position. When the table 20 is in the closed position, it covers the installation space 11 and extends along the front-rear direction of the vehicle. When the table 20 is in the unfolded position, it is perpendicular to the armrest body 10 and extends along the left-right direction of the vehicle.

[0036] With the right side of the vehicle as the front view, when the table 20 moves from the closed position to the unfolded position, the transmission component 31 rotates clockwise. The other end of the transmission component 31 rotates around the end connected to the armrest body 10, and the table 20 moves forward in the front-back direction. When the other end of the transmission component 31 rotates relative to the other end, the table 20 can be automatically folded and unfolded, allowing passengers to work and entertain in the vehicle, and greatly enhancing the vehicle's intelligent functions.

[0037] The driving component can be a drive motor, and the driving component is controlled by an on-board controller, so that the table 20 can be automatically folded and unfolded through the on-board controller.

[0038] Therefore, the driving component drives the other end of the transmission component 31 to rotate relative to the armrest body 10 in the front-back direction. The other end of the transmission component 31 is connected to the table 20. As the table 20 moves along the front-back direction with the other end of the transmission component 31, it moves upward relative to the armrest body 10. The table 20 also rotates outward relative to the armrest body 10, realizing the automatic folding and unfolding of the table 20 and improving the convenience of the electric armrest 100.

[0039] like Figures 3-6 As shown, a first gear 21 is connected to the tabletop 20, and a second gear 311 is provided on the transmission component 31. The first gear 21 and the second gear 311 mesh with each other. The driving component drives the transmission component 31 to rotate relative to the armrest body 10, so that the tabletop 20 moves in the front-back direction while rotating relative to the armrest body 10. Specifically, one end of the transmission component 31 is rotatably connected to the armrest body 10 and meshes with the first gear 21 on the table 20 via the second gear 311. The other end of the transmission component 31 is connected to the table 20. The driving component drives the other end of the transmission component 31 to rotate relative to the armrest body 10. The other end of the transmission component 31 rotates in a plane composed of the front-back direction and the height direction, so the table 20 moves along the front-back direction with the other end of the transmission component 31. Since the first gear 21 is set in a plane composed of the front-back direction and the height direction, the other end of the transmission component 31 rotates along with the transmission component 31, and the second gear 311 meshing with the first gear 21 rotates. The second gear 311 is set in a plane composed of the left-right direction and the front-back direction. The rotation of the second gear 311 causes the table 20 to rotate outward relative to the armrest body 10, thereby completing the automatic unfolding and closing of the table 20.

[0040] like Figures 3-6As shown, the drive assembly 30 includes an adjusting rod 32, one end of which is rotatably connected to the armrest body 10 and the other end of which is rotatably connected to the transmission member 31. The drive member adjusts the length of the adjusting rod 32 so that the transmission member 31 rotates relative to the armrest body 10. Specifically, one end of the adjusting rod 32 is rotatably connected to the armrest body 10, meaning the other end of the adjusting rod 32 can rotate relative to one end of the adjusting rod 32. The other end of the adjusting rod 32 is rotatably connected to the transmission member 31. The drive member can drive the adjusting rod 32 to extend or shorten, so that the other end of the transmission member 31 rotates around one end of the transmission member 31 in a plane composed of the front-back direction and the height direction. This allows the tabletop 20 to move with the transmission member 31 in the front-back direction while rotating relative to the armrest body 10, thus achieving automatic unfolding or closing of the tabletop 20.

[0041] The driving component can be connected to the adjusting rod 32. When the driving component drives the adjusting rod 32 to extend, the transmission component 31 rotates clockwise when viewed from the right side of the vehicle. At the same time, the table 20 moves forward and rotates relative to the armrest body 10 to the side outside the vehicle. That is, the table 20 switches from the closed position to the unfolded position, realizing the automatic unfolding of the table 20.

[0042] When the drive unit drives the adjustment rod 32 to shorten, the transmission unit 31 rotates counterclockwise when viewed from the right side of the vehicle. As the table 20 moves backward, the table 20 rotates relative to the armrest body 10 towards the side inside the vehicle. That is, the table 20 switches from the unfolded position to the closed position, realizing the automatic closing of the table 20.

[0043] Furthermore, such as Figure 3 As shown, the drive assembly 30 further includes a connecting rod 33, which extends in the left-right direction. The two ends of the connecting rod 33 are rotatably connected to the upper side of the transmission member 31 in the left-right direction. The connecting rod 33 is also throttle-connected to the tabletop 20, allowing the tabletop 20 to move back and forth with the transmission member 31. Specifically, the connecting rod 33 is rotatably connected to the upper side of the transmission member 31 at both ends in the left-right direction; that is, the connecting rod 33 is rotatably connected to the other end of the transmission member 31 at both ends in the left-right direction. This allows the connecting rod 33 to rotate relative to the transmission member 31. The connection between the connecting rod 33 and the tabletop 20 throttles the tabletop 20, thus connecting the tabletop 20 to the transmission member 31, causing the tabletop 20 to move back and forth with the other end of the transmission member 31.

[0044] Furthermore, the electric handrail 100 also includes a retaining assembly 40, which includes a first rod 41 and a second rod 42. The first rod 41 is rotatably connected to the handrail body 10, one end of the second rod 42 is fixedly connected to the first rod 41 and the other end is connected to the connecting rod 33, and one end of the adjusting rod 32 is rotatably connected to the first rod 41. Specifically, the first rod 41 extends in the left-right direction and is rotatably connected to the inner wall of the mounting space 11 in the left-right direction. That is, the first rod 41 is rotatably connected to the handrail body 10, and the adjusting rod 32 is rotatably connected to the first rod 41, thereby rotatably connecting the adjusting rod 32 to the handrail body 10. The second rod 42 is connected between the first rod 41 and the connecting rod 33, and one end of the second rod 42 is fixedly connected to the first rod 41, so the second rod 42 can rotate relative to the handrail body 10 and relative to the adjusting rod 32.

[0045] according to Figures 4-6 As shown, the connecting rod 33 includes a shaft portion 331 and a clearance portion 22. One end of the shaft portion 331 and the clearance portion 22 are fixedly connected. The shaft portion 331 is connected to the transmission member 31 and is rotatable relative to the transmission member 31. The clearance portion 22 is bent backward, and the other end of the clearance portion 22 is rotatably connected to the other end of the second rod 42. Specifically, the shaft portion 331 extends in the left-right direction, and both ends of the shaft portion 331 are rotatably connected to the transmission member 31 in the left-right direction. One end of the clearance portion 22 is fixedly connected to the shaft portion 331, and the other end of the clearance portion 22 is rotatably connected to the other end of the second rod 42. The clearance portion 22 is bent backward to avoid interference between the clearance portion 22 and the transmission member 31 when the clearance portion 22 rotates.

[0046] In some embodiments, the transmission member 31 includes two extension rods 312 and a first crossbar 313. The two extension rods 312 are rotatably connected to the inner wall of the mounting space 11, and the first crossbar 313 is connected between the two extension rods 312. The other end of the adjusting rod 32 is rotatably connected to the first crossbar 313. Specifically, the two extension rods 312 are parallel to each other, one end of each extension rod 312 is rotatably connected to the inner wall of the mounting space 11 in the left-right direction, and the other end of each extension rod 312 is rotatably connected to the connecting rod 33. The first crossbar 313 extends in the left-right direction, and its two ends in the left-right direction are fixedly connected to the two extension rods 312, respectively. The other end of the adjusting rod 32 is rotatably connected to the first crossbar 313. The driving member drives the adjusting rod 32 to extend or shorten, thereby increasing or decreasing the distance between the first crossbar 313 and the first rod 41, so that the other end of the transmission member 31 rotates relative to the armrest body 10, so that the table 20 moves in the front-back direction while rotating relative to the armrest body 10.

[0047] In addition, the transmission component 31 also includes a second crossbar 314, which is connected between two extension rods 312. The second crossbar 314 and the first crossbar 313 are spaced apart in the length direction of the extension rods 312. The second crossbar 314 and the first crossbar 313 can improve the structural strength of the transmission component 31 and ensure the structural stability of the transmission component 31.

[0048] like Figures 1-3 As shown, the installation space 11 is provided with two first shaft holes 111 and two second shaft holes 112. The first shaft holes 111 are located behind the second shaft holes 112. The retaining assembly 40 is rotatably connected to the two first shaft holes 111, and one end of the two extension rods 312 is rotatably connected to the two second shaft holes 112 respectively. Specifically, two first shaft holes 111 are spaced apart in the left-right direction within the installation space 11, keeping both ends of the component 40 rotatably connected to the two first shaft holes 111. That is, the two ends of the first rod 41 are rotatably connected to the two first shaft holes 111 in the left-right direction. Two second shaft holes 112 are spaced apart in the left-right direction within the installation space 11, and the two second shaft holes 112 are located in front of the two first shaft holes 111. One end of each of the two extension rods 312 is rotatably connected to the two second shaft holes 112. That is, one end of the transmission member 31 is rotatably connected to the second shaft hole 112, thereby rotatably connecting one end of the transmission member 31 to the armrest body 10. The driving member drives the other end of the transmission member 31 to rotate around the second shaft hole 112, thereby causing the other end of the transmission member 31 to move the table 20 in the front-back direction. Since the rotation of the other end of the transmission member 31 drives the second gear part 311 to rotate, the first gear part 21 rotates accordingly, thereby causing the table 20 to rotate relative to the armrest body 10, realizing the automatic unfolding or closing of the table 20.

[0049] Reference Figures 3-6 As shown, the connecting rod 33 includes a shaft portion 331 and a bent rod portion 332. One end of the shaft portion 331 and the bent rod portion 332 are fixedly connected. The length of the bent rod portion 332 is equal to the distance between the first shaft hole 111 and the second shaft hole 112. Specifically, the length of the second rod 42 is the same as the length of the transmission member 31, and the length of the bent rod portion 332 is equal to the distance between the first shaft hole 111 and the second shaft hole 112. Therefore, the lines connecting the second rod 42, the bent rod portion 332, the transmission member 31, and the first shaft hole 111 and the second shaft hole 112 form a parallelogram.

[0050] Therefore, during the rotation of the transmission component 31, the second rod 42 is parallel to the transmission component 31, and the line connecting the two ends of the bent rod 332 is parallel to the line connecting the two shaft holes. Thus, the sum of the angle of rotation of the connecting rod 33 relative to the transmission component 31 and the angle of rotation of the transmission component 31 relative to the armrest body 10 is equal to 0, thereby ensuring that the tabletop 20 always remains horizontal.

[0051] like Figures 1-3 , Figure 5 As shown, the armrest body 10 has two mounting spaces 11, which are symmetrically arranged. There are two tabletops 20 and two drive components 30. The two drive components drive the two tabletops 20 to move in the front-back direction while rotating relative to the armrest body 10. Specifically, the two mounting spaces 11 are adjacent in the left-right direction and symmetrical about the center line of the armrest body 10. Correspondingly, there are two tabletops 20, which are respectively covered on the two mounting spaces 11. There are two drive components 30, which are independent of each other. The two drive components drive the two tabletops 20 to move in the front-back direction while rotating relative to the armrest body 10. The two tabletops 20 are independent of each other, and one or both tabletops 20 can be automatically opened or closed.

[0052] like Figure 1 and Figure 2 As shown, two tabletops 20 are provided with clearance parts 22. When one tabletop 20 rotates, the clearance part 22 is used to avoid the other tabletop 20. That is, the two tabletops 20 are spaced apart in the left-right direction. Since the tabletops 20 are rectangular and have four corners, one corner of the tabletop 20 may interfere with the other tabletop 20 when rotating. Therefore, the clearance part 22 is provided at one corner of the tabletop 20 to prevent interference with the other tabletop 20 when one tabletop 20 rotates.

[0053] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0054] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0055] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An electric handrail, characterized in that, include: The handrail body (10) has an installation space (11) inside. A tabletop (20) is disposed above the armrest body (10); A drive assembly (30) is disposed within the installation space (11). The drive assembly (30) includes a drive member, a transmission member (31), an adjusting rod (32), and a connecting rod (33). The drive member is rotatably connected to the transmission member (31). One end of the transmission member (31) is rotatably connected to the armrest body (10), and the other end is rotatably connected to the tabletop (20). The drive member drives the other end of the transmission member (31) to rotate relative to the armrest body (10), so that the tabletop (20) moves upward while rotating relative to the armrest body (10). One end of the adjusting rod (32) is rotatably connected to the armrest body (10), and the other end is rotatably connected to the transmission member (31). The length of the adjusting rod (32) is adjusted so that the transmission member (31) rotates relative to the armrest body (10). The connecting rod (33) extends in the left and right direction. The two ends of the connecting rod (33) in the left and right direction are rotatably connected to the upper side of the transmission member (31). The connecting rod (33) is connected to the table (20) so that the table (20) moves back and forth with the transmission member (31). The connecting rod (33) includes: a shaft part (331) and a bent rod part (332). One end of the shaft part (331) and the bent rod part (332) are fixedly connected. The shaft part (331) is connected to the transmission member (31) and can rotate relative to the transmission member (31). The bent rod part (332) is bent backward. The retaining assembly (40) includes: a first rod (41) and a second rod (42), the first rod (41) being rotatably connected to the handrail body (10), one end of the second rod (42) being fixedly connected to the first rod (41) and the other end being connected to the connecting rod (33), one end of the adjusting rod (32) being rotatably connected to the first rod (41), and the other end of the bent rod portion (332) being rotatably connected to the other end of the second rod (42); The tabletop (20) is connected to a first gear (21), and the transmission component (31) is provided with a second gear (311). The first gear (21) and the second gear (311) mesh with each other.

2. The electric handrail according to claim 1, characterized in that, The transmission component (31) includes two extension rods (312) and a first crossbar (313). The two extension rods (312) are rotatably connected to the inner wall of the installation space (11), and the first crossbar (313) is connected between the two extension rods (312). The other end of the adjusting rod (32) is rotatably connected to the first crossbar (313).

3. The electric handrail according to claim 2, characterized in that, The installation space (11) is provided with two first shaft holes (111) and two second shaft holes (112). The first shaft holes (111) are located behind the second shaft holes (112). The retaining assembly (40) is rotatably connected to the two first shaft holes (111). One end of the two extension rods (312) is rotatably connected to the two second shaft holes (112) respectively.

4. The electric handrail according to claim 3, characterized in that, The length of the bent rod portion (332) is equal to the distance between the first shaft hole (111) and the second shaft hole (112).

5. The electric handrail according to claim 1, characterized in that, The armrest body (10) is provided with two installation spaces (11), which are symmetrically arranged. There are two tabletops (20) and two drive components (30). The two drive components drive the two tabletops (20) to move in the front-back direction while rotating relative to the armrest body (10).

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