Armrest assembly and seat

Abstract

The utility model relates to the technical field of seats, and provides an armrest assembly and a seat. The armrest assembly comprises an armrest body, a transmission assembly and a supporting piece, the armrest body is movably connected with the seat through the transmission assembly, the supporting piece is movably connected with the armrest through the same transmission assembly, and therefore the transmission assembly drives the supporting piece and the armrest body to move synchronously. The supporting piece and the armrest body are driven by the transmission assembly to move synchronously, so that the supporting piece can be unfolded and supported on the seat while the armrest body is unfolded for use, and the structural strength and stability of the armrest assembly are improved. When the armrest body is folded, the supporting piece can be automatically and synchronously folded, so that the occupied space of the armrest assembly can be saved when the armrest assembly does not need to be used, and the use requirements under different conditions are met. Moreover, the supporting piece and the armrest body can be synchronously unfolded or folded, and the supporting piece does not need to be independently unfolded or folded, so that the use operation is simplified, and the use experience is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of seat, concretely relates to a handrail subassembly and seat. BACKGROUND

[0002] The seat is a kind of common seat, usually has the backrest that can be used to lean, in addition, some types of seat are also provided with handrails, and the handrails can support the arms of users, which can improve the comfort of the seat. At present, in the seat with handrails on the market, the handrails of some seats can be folded and stored, so as to save the space occupied by the handrails when the handrails are not needed, and some seats are also provided with supporting rods for supporting the handrails to improve the stability of the handrails. However, when the handrails are unfolded or stored, the supporting rods also need to be unfolded or stored accordingly, which leads to complex operation and affects the use experience. SUMMARY

[0003] Therefore, the utility model provides a handrail subassembly and seat to solve the problem that the operation of folding handrails in the existing seat is complex and affects the use experience.

[0004] To solve the above problems, the technical scheme of the utility model is as follows:

[0005] A handrail subassembly applied to a seat, comprising: a handrail body; a transmission assembly, the handrail body is movably connected with the seat through the transmission assembly to reciprocate between unfolding and storage relative to the seat; a supporting member is movably connected with the handrail through the transmission assembly to reciprocate between supporting on the seat and storage relative to the handrail body; wherein the transmission assembly is used to drive the supporting member and the handrail body to move synchronously.

[0006] In some embodiments, the transmission assembly comprises: a driving member connected between the handrail body and the seat; a driven member connected between the handrail body and the supporting member and in transmission connection with the driving member.

[0007] In some embodiments, the driving member comprises: a rotating shaft connected to the seat and movably connected with the handrail body; a first driving wheel sleeved on the rotating shaft; a second driving wheel rotatably connected with the handrail body and in engagement with the first driving wheel to move relative to the first driving wheel; wherein the driven member is in transmission connection with the second driving wheel to move synchronously with the second driving wheel.

[0008] In some embodiments, the driven member comprises: a first driven wheel rotatably connected to the armrest body and engaged with the second driving wheel; a second driven wheel connected between the armrest body and the support and connected to the first driven wheel; and a transmission member connected between the first driven wheel and the second driven wheel to drive the second driven wheel to move synchronously with the first driven wheel.

[0009] In some embodiments, the transmission member is a synchronous belt or a chain; or, the transmission member comprises at least one transmission gear, each of which is rotatably connected to the armrest body and sequentially engaged between the first driven wheel and the second driven wheel; wherein the first transmission gear is engaged with the first driven wheel, and the last transmission gear is engaged with the second driven wheel.

[0010] In some embodiments, the transmission assembly further comprises a linkage connected between the driven member and the second driving wheel to drive the driven member to move synchronously with the second driving wheel.

[0011] In some embodiments, the armrest body is provided with a mounting cavity, and at least part of the transmission assembly is arranged in the mounting cavity; wherein the support is accommodated in the mounting cavity.

[0012] In some embodiments, the support is provided with a clearance space, and at least part of the structure of the transmission assembly is located in the clearance space when the support is accommodated in the mounting cavity.

[0013] In some embodiments, the armrest assembly further comprises a clamping member arranged at one end of the support supporting the seat to be clamped and fixed with the seat.

[0014] Embodiments of the utility model also provide a seat comprising a seat plate, a backrest and the above-mentioned armrest assembly, the seat plate is connected with the backrest, the armrest body is movably connected with the seat plate and / or the backrest through the transmission assembly.

[0015] In some embodiments, the seat plate is provided with a connecting seat, and the support is detachably connected with the connecting seat.

[0016] In some embodiments, the seat further comprises a driving member connected with at least the transmission assembly to drive the transmission assembly to move; and a controller electrically connected with the driving member to control the start and stop of the driving member.

[0017] The handrail assembly and the seat provided by the embodiment of the utility model, the handrail assembly includes a handrail body, a transmission assembly and a supporting piece, the handrail body is movably connected with the seat through the transmission assembly, and the supporting piece is movably connected with the handrail through the transmission assembly. In this way, the supporting piece and the handrail body are driven to move synchronously through the transmission assembly, so that the supporting piece can be unfolded and supported on the seat while the handrail body is unfolded for use, and the structural strength and stability of the handrail assembly are improved. Moreover, the supporting piece can be unfolded or folded synchronously with the handrail body through synchronous movement, and the operation of unfolding or folding the supporting piece separately is not needed, so that the operation is simplified and the use experience is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is the structural schematic view of the handrail assembly provided by the embodiment of the utility model;

[0019] Figure 2 is the structural schematic view of the seat provided by the embodiment of the utility model;

[0020] Figure 3 is the structural schematic view of the seat in another use state provided by the embodiment of the utility model;

[0021] Figure 4 is Figure 3 is the local enlarged view of A in Fig. 1.

[0022] BRIEF DESCRIPTION OF DRAWINGS

[0023] 1, handrail assembly; 11, handrail body; 111, mounting cavity; 12, transmission assembly; 121, driving piece; 1211, rotating shaft; 1212, first driving wheel; 1213, second driving wheel; 122, driven piece; 1221, first driven wheel; 1222, second driven wheel; 1223, transmission piece; 13, supporting piece; 131, avoiding space; 14, clamping piece; 141, protruding part; 2, seat; 21, seat plate; 211, connecting seat; 22, backrest. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the utility model more clear and intelligible, the utility model is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model.

[0025] In the specific embodiments, various specific technical features described can be combined in any suitable manner without contradiction, for example, different embodiments and technical solutions can be formed by the combination of different specific technical features. In order to avoid unnecessary repetition, various possible combination manners of each specific technical feature in the utility model are not described again.

[0026] In the following description, the terms "first," "second," etc., are used merely to distinguish different objects and do not indicate that the objects have the sameness or relationship. It should be understood that the directional descriptions "above," "below," "outside," and "inside" refer to the orientation under normal use conditions, while "left" and "right" refer to the left and right directions shown in the corresponding diagrams, which may or may not be the left and right directions under normal use conditions.

[0027] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. "A plurality of" means two or more.

[0028] like Figure 1 and Figure 2 As shown, this utility model embodiment provides an armrest assembly 1, which can be applied to various types of seats such as car seats, office seats, folding seats, and intelligent seats that can move automatically, such as seats for intelligent nursing robots. When using the seat, the armrest assembly 1 supports the user's arms, reducing the burden on the user's arms and thus improving the comfort of the seat. The armrest assembly 1 includes an armrest body 11, a transmission assembly 12, and a support member 13. The armrest body 11 is movably connected to the seat through the transmission assembly 12, and the support member 13 is movably connected to the armrest through the same transmission assembly 12, thereby causing the transmission assembly 12 to drive the support member 13 to move synchronously with the armrest body 11.

[0029] Specifically, the transmission assembly 12 is a component composed of multiple parts connected by transmission. The parts in the transmission assembly 12 can move synchronously. Therefore, by connecting the handrail body 11 and the support member 13 through different parts, the support member 13 can be driven to move synchronously with the handrail body 11. Optionally, the parts in the transmission assembly 12 can be in various forms such as gears, timing belts, and chains. They can usually be flexibly designed according to the required relative motion relationship and spatial dimensions of the handrail body 11 and the support member 13.

[0030] Specifically, the armrest body 11 is the component that directly contacts and supports the user's arm. The armrest body 11 is movable relative to the seat to switch between an unfolded and folded state as needed. In some embodiments, the unfolded state of the armrest body 11 is as follows: Figure 2As shown, the armrest body 11 can be moved to a designated position under the action of an external force, for example, a position parallel to the seat plate of the seat or a position inclined at a smaller angle, and at the same time, the support 13 can be unfolded synchronously with the armrest body 11 and supported on the seat plate of the seat under the action of the transmission assembly 12, thereby providing reliable support for the armrest body 11, enabling the armrest body 11 to withstand greater external force without being easily damaged, and also reducing the shaking of the armrest body 11, improving the structural strength and stability of the armrest body 11.

[0031] In some embodiments, the armrest body 11 is in a retracted state as shown in Figure 3 As shown, the armrest body 11 can be lifted upward relative to the seat plate of the seat under the action of an external force to save the occupied space in the horizontal direction, and the support 13 can be retracted synchronously with the armrest body 11 under the action of the transmission assembly 12. Alternatively, when the support 13 is retracted, it can be folded inward relative to the armrest body 11, which is a relatively compact design; of course, the support 13 can also be unfolded outward relative to the armrest body 11, so that the entire armrest assembly 1 extends in the height direction, which can also save the occupied space in the horizontal direction.

[0032] The armrest assembly 1 provided by the embodiment of the utility model, including armrest body 11, transmission assembly 12 and support 13, through the transmission assembly 12 is connected with the seat activity to armrest body 11, and support 13 is connected with armrest body 11 activity, can realize the synchronous movement of armrest body 11 and support 13. In this way, when armrest body 11 is unfolded and used, support 13 can be unfolded and supported synchronously, without the need for separate operation of the movement of support 13, and when armrest body 11 is extruded by an external force, support 13 can resist the bending deformation of armrest body 11 and reduce the shaking of armrest body 11, thereby enhancing the load-carrying capacity of armrest body 11 to external force and improving the structural strength and stability of armrest assembly 1. When armrest body 11 is retracted, support 13 can also be automatically retracted synchronously, thereby saving the occupied space of armrest assembly 1 when armrest assembly 1 is not needed, meeting the use requirements in different situations. Through the above design, as long as the force is applied to armrest body 11 during use, armrest body 11 and support 13 can move synchronously, without the need for separate operation of support 13, which is a clever structural design, simple and convenient to use and operate, and has good user experience.

[0033] In some embodiments, as shown in Figure 1As shown, the transmission assembly 12 comprises a driving member 121 and a driven member 122. The driving member 121 is connected between the armrest body 11 and the seat, and the driven member 122 is connected between the armrest body 11 and the support member 13, and is in transmission connection with the driving member 121. Specifically, when the armrest body 11 moves, the driving member 121 can move synchronously and drive the driven member 122 to move, and then drive the support member 13 to move, so as to realize the synchronous movement of the support member 13 and the armrest body 11. It can be understood that the driving member 121 and the driven member 122 can be composed of gears, synchronous belts, chains and the like, and the forms of the driving member 121 and the driven member 122 can be the same or different, and the design flexibility is high, as long as the synchronous movement of the support member 13 and the armrest body 11 can be realized, and the synchronous unfolding and folding can be met.

[0034] Optionally, in some embodiments, a driving member for driving the driving member 121 to move can also be arranged on the driving member 121 or the armrest body 11, so that by controlling the opening and closing of the driving member, the automatic movement of the driving member 121 can be realized, and the automatic synchronous movement of the armrest body 11 and the support member 13 can be driven. This design does not need to manually operate the movement of the armrest body 11, and is suitable for the scene of intelligent seats.

[0035] In some embodiments, as shown in the left part of FIG. 1, Figure 1 As shown, the driving member 121 comprises a rotating shaft 1211, a first driving wheel 1212 and a second driving wheel 1213. The rotating shaft 1211 is connected to the seat and movably connected to the armrest body 11, and the first driving wheel 1212 is sleeved on the rotating shaft 1211. The second driving wheel 1213 is rotatably connected to the armrest body 11 and engaged with the first driving wheel 1212 to move relative to the first driving wheel 1212. The driven member 122 is in transmission connection with the second driving wheel 1213 to move synchronously with the second driving wheel 1213.

[0036] Specifically, the first driving wheel 1212 and the second driving wheel 1213 can adopt gears with the same modulus, and the first driving wheel 1212 can be fixedly sleeved on the rotating shaft 1211 or integrally formed with the rotating shaft 1211. When the armrest body 11 moves, the armrest body 11 drives the connecting shaft of the second driving wheel 1213 to rotate synchronously around the rotating shaft 1211, and at the same time, the second driving wheel 1213 rotates around its own connecting shaft through the engagement transmission with the first driving wheel 1212, thereby driving the driven member 122 to move synchronously.

[0037] It can be understood that the above embodiment is only an example of a specific implementation of the driving member 121, and the driving member 121 can also adopt other design schemes, as long as it can drive the driven member 122 to move synchronously when the armrest body 11 moves.

[0038] In some embodiments, such as Figure 1 As shown, the driven member 122 includes a first driven wheel 1221, a second driven wheel 1222, and a transmission member 1223. The first driven wheel 1221 is rotatably connected to the handrail body 11 and meshes with the second driving wheel 1213. The second driven wheel 1222 is connected between the handrail body 11 and the support member 13 and is connected to the first driven wheel 1221. The transmission member 1223 is connected between the first driven wheel 1221 and the second driven wheel 1222 to drive the second driven wheel 1222 to move synchronously with the first driven wheel 1221.

[0039] Alternatively, in some implementations, such as Figure 1 As shown, the transmission component 1223 can be a synchronous belt, and the first driven pulley 1221 and the second driven pulley 1222 can be pulleys respectively. The first driven pulley 1221 can be a combination of a pulley and a gear, with the pulley portion of the first driven pulley 1221 connected to the transmission component 1223, and the gear portion of the first driven pulley 1221 meshing with the second driving pulley 1213. Similarly, the transmission component 1223 can also be a chain, and the first driven pulley 1221 and the second driven pulley 1222 can be sprockets respectively. In other embodiments, the transmission component 1223 can also be in the form of gears. Specifically, the transmission component 1223 includes at least one transmission gear, each of which is rotatably connected to the handrail body 11 and sequentially meshes with the first driven wheel 1221 and the second driven wheel 1222. Furthermore, along the direction of the gear arrangement, the first transmission gear meshes with the first driven wheel 1221, and the last transmission gear meshes with the second driven wheel 1222. The above designs can achieve synchronous movement between the second driven wheel 1222 and the first driven wheel 1221, offering high design flexibility.

[0040] It is understood that the above embodiments are only examples of specific implementation of the driven member 122. The driven member 122 can also adopt other design schemes. For example, the driven member 122 can be just a gear, or the first driven wheel 1221 can directly mesh with the second driven wheel 1222, as long as it can move synchronously with the driving member 121 and drive the support member 13 to move.

[0041] In some embodiments, the transmission assembly 12 further comprises a linkage connected between the driven member 122 and the second driving wheel 1213 to drive the driven member 122 and the second driving wheel 1213 to move synchronously. For example, in some embodiments, when the driven member 122 comprises a first driven wheel 1221 and a second driven wheel 1222, the linkage can be arranged between the first driven wheel 1221 and the second driving wheel 1213, while the first driven wheel 1221 can be connected to the second driven wheel 1222 through a transmission member 1223, which can also be in the form of a gear and directly engaged with the second driven wheel 1222. It can be understood that since the linkage has similar functions to the transmission member 1223 described above, the specific form of the linkage can also be in the form of a synchronous belt, a chain or a gear, which can be designed with reference to the transmission member 1223 described above.

[0042] In some embodiments, as shown in Figure 1 The armrest body 11 is provided with a mounting cavity 111, at least part of the transmission assembly 12 is arranged in the mounting cavity 111, and the support member 13 is received in the mounting cavity 111. Specifically, the size of the mounting cavity 111 can be designed according to the size of the transmission assembly 12 and the support member 13 arranged in the mounting cavity 111. The mounting cavity 111 can be arranged on the side of the armrest body 11 away from the user when the armrest body 11 is unfolded for use, so that the mounting cavity 111 is not easily observed from the outside, has better aesthetics, and can better avoid damage to the transmission assembly 12 by external force or injury to the user.

[0043] In some embodiments, as shown in Figure 1 The support member 13 can also be provided with a clearance space 131 for avoiding the mounting position of the transmission assembly 12. When the support member 13 is received in the mounting cavity 111, part of the structure of the transmission assembly 12 can be accommodated in the clearance space 131, for example, the transmission member 1223 between the first driven member 122 and the second driven member 122 can be accommodated in the clearance space 131. The above design has a more compact structure, fully utilizes the space of the mounting cavity 111 for receiving, and is beneficial to reducing the overall volume after receiving.

[0044] In some embodiments, as shown in Figure 2 and Figure 3 The armrest assembly 1 further comprises a clamping member 14 arranged at one end of the support member 13 to be clamped and fixed with the seat. Specifically, the clamping member 14 is usually a movable and / or elastically deformable component. When the clamping member 14 is clamped with the seat, a specific operation is required to release the connection relationship, so as to achieve reliable fixation of the support member 13 and the seat, and the support member 13 can be disassembled as needed.

[0045] The design of the clamping piece 14 can be various, for example, in one embodiment, as shown in Figure 4 the clamping piece 14 can adopt a spring, one end of the spring is rotatably connected with the support piece 13 supporting the seat, the other end of the spring is rotatable relative to the support piece 13, a protruding portion 141 can be arranged on the spring, the protruding portion 141 is clamped into the clamping position correspondingly arranged on the seat, and the clamping and fixing of the support piece 13 and the seat are completed, and the spring can continuously exert an elastic force to press the protruding portion 141 against the clamping position, and the fixing reliability is good; when disassembly is needed, the user can squeeze the spring to make the spring rotate and deform, drive the protruding portion 141 to separate from the clamping position on the seat, and the disassembly of the support piece 13 and the seat is completed.

[0046] By adopting the above design, the support piece 13 can be fixed with the seat through the clamping piece 14 when supporting the seat, and the support piece 13 is not easy to loosen during supporting, thereby improving the stability of the support. Moreover, when the support piece 13 needs to be stored, the clamping piece 14 can be disassembled from the clamping position on the seat by simple operation such as pressing the spring, the fixing of the support piece 13 is released, and the support piece 13 can be stored, and the operation is convenient.

[0047] As shown in Figure 2 and Figure 3 The utility model embodiment further provides a seat 2, including seat board 21, backrest 22 and above -mentioned armrest assembly 1, seat board 21 is connected with backrest 22, armrest body 11 is connected with seat board 21 and / or backrest 22 movably through transmission assembly 12.

[0048] Optionally, the seat 2 can be a vehicle seat, an office chair, a folding seat and the like, and the seat board 21 and the backrest 22 can be fixedly connected, integrally formed or movably connected according to the type of the seat. Optionally, the armrest body 11 can be movably connected to the seat board 21 or the backrest 22, and when the seat board 21 and the backrest 22 are integrally formed, the armrest body 11 can also be movably connected to the integrally formed component, as long as the armrest body 11 can be switched between the unfolded state and the stored state as needed.

[0049] The seat 2 provided by the utility model embodiment can realize synchronous movement of the armrest body 11 and the support piece 13 under the action of the transmission assembly 12 (refer to Figure 1 ), and the structure is designed ingeniously. When the armrest body 11 is unfolded, the support piece 13 can be unfolded and supported synchronously, the structural strength is high, and the support stability is good. When the armrest body 11 is stored, the support piece 13 can also be stored synchronously, and the operation is simple, thereby improving the use experience of the seat 2.

[0050] In some embodiments, as shown in Figure 2 and Figure 3 The connecting seat 211 is arranged on the seat plate 21, and the support member 13 is detachably connected with the connecting seat 211. Specifically, the position of the connecting seat 211 can be designed according to the support position of the support member 13. The detachable connection between the connecting seat 211 and the support member 13 can be achieved in various ways. For example, in some embodiments, a connecting hole can be formed on the connecting seat 211, and the support member 13 is inserted into the connecting hole to limit the support position of the support member 13. When disassembly is needed, the support member 13 can be pulled out of the connecting hole. In another embodiment, when the support member 13 is provided with the clamping member 14, a clamping groove or the like can be arranged on the connecting seat 211, and the clamping member 14 is clamped in the clamping groove to achieve reliable fixation of the support member 13 and the connecting seat 211. In addition, the connecting seat 211 and the support member 13 can be connected in a detachable manner such as threaded connection or magnetic connection.

[0051] The above embodiments can improve the support stability by arranging the connecting seat 211 on the seat plate 21 and connecting and fixing the support member 13 and the connecting seat 211 when the support member 13 is unfolded for support. In addition, the support member 13 and the connecting seat 211 can be detached according to the needs of the user, so that the support member 13 can be folded and arranged flexibly.

[0052] In some embodiments, the seat 21 can further include a driving member and a controller. The driving member is connected with the transmission assembly 12 and can drive the transmission assembly 12 to move. The controller is electrically connected with the driving member and can control the opening or closing of the driving member according to the needs. In some embodiments, the driving member can be connected with the second driving wheel 1213 of the driving member 121, so as to drive the second driving wheel 1213 to rotate around the first driving wheel 1212, and further drive other components to move.

[0053] Specifically, when the seat 21 is needed, the user can operate the controller to control the driving member to open, so as to automatically move the transmission assembly 12, and further automatically move the armrest body 11 and the support member 13, so as to unfold the armrest body 11 and simultaneously unfold the support member 13. When the armrest body 11 is needed to be folded, the user can operate the controller to control the driving member to reverse, so as to automatically fold the armrest body 11, and the support member 13 can be simultaneously folded under the action of the transmission assembly 12.

[0054] Optionally, in some embodiments, the seat plate 21 can also be provided with a connecting seat 211, and the connection between the connecting seat 211 and the support 13 can adopt plug-in connection, magnetic attraction connection or the like. In this way, when the support 13 is automatically unfolded and supported, the position of the connecting seat 211 can be automatically positioned and connected with the connecting seat 211, and the stability of the support is better. Moreover, when the support 13 is automatically folded, the connection with the connecting seat 211 can be automatically disconnected, or the support 13 can be manually disconnected from the connecting seat 211 by the user, and then automatically folded. Through such design, the user only needs to perform simple operation on the controller, for example, press the specified button on the controller, to realize the synchronous unfolding or folding of the armrest body 11 and the support 13, without manually unfolding or folding the body 11 and the support 13, and the use and operation are more convenient.

[0055] The embodiment of the utility model realizes the automatic movement of the armrest body 11 and the support 13 by adopting the design of the driving part and the controller, the intelligent degree is high, and the use experience is better. This design can be applied to the seat of some intelligent devices, for example, the seat of an intelligent nursing robot, so that the user who is inconvenient to move and weak in body can have more comfortable use experience.

[0056] The above is only the preferred embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. An armrest assembly used in a seat, characterized in that, The armrest assembly comprises: an armrest body; a transmission assembly, the armrest body being movably connected with the seat via the transmission assembly to reciprocate between unfolding and folding relative to the seat; a support movably connected with the armrest via the transmission assembly to reciprocate between being supported on the seat and being folded relative to the armrest body; wherein the transmission assembly is configured to drive the support and the armrest body to move synchronously.

2. The handrail assembly of claim 1, wherein, The transmission assembly comprises: a driving member connected between the armrest body and the seat; a driven member connected between the armrest body and the support and in transmission connection with the driving member.

3. The handrail assembly of claim 2, wherein, The driving member comprises: a rotating shaft connected to the seat and movably connected with the armrest body; a first driving wheel sleeved on the rotating shaft; a second driving wheel rotatably connected with the armrest body and in meshing connection with the first driving wheel to move relative to the first driving wheel; wherein the driven member is in transmission connection with the second driving wheel to move synchronously with the second driving wheel.

4. The handrail assembly of claim 3, wherein The driven member comprises: a first driven wheel rotatably connected with the armrest body and in meshing connection with the second driving wheel; a second driven wheel connected between the armrest body and the support and in connection with the first driven wheel; a transmission member connected between the first driven wheel and the second driven wheel to drive the second driven wheel to move synchronously with the first driven wheel.

5. The handrail assembly of claim 4, wherein, The transmission member is a synchronous belt or a chain; or The transmission member comprises at least one transmission gear, each of the transmission gears being rotatably connected with the armrest body and arranged in meshing connection between the first driven wheel and the second driven wheel in sequence, wherein a first transmission gear is in meshing connection with the first driven wheel and a last transmission gear is in meshing connection with the second driven wheel.

6. The handrail assembly of claim 3, wherein The transmission assembly further comprises: a linkage member connected between the driven member and the second driving wheel to drive the driven member to move synchronously with the second driving wheel.

7. A handrail assembly as claimed in any one of claims 1 to 6, wherein, The armrest body is provided with a mounting cavity, and at least part of the transmission assembly is arranged in the mounting cavity; wherein the support is received in the mounting cavity.

8. The handrail assembly of claim 7, wherein, The support is provided with a clearance space, and at least part of the transmission assembly is arranged in the clearance space when the support is received in the mounting cavity.

9. A handrail assembly as claimed in any one of claims 1 to 6, wherein, The armrest assembly further comprises: a clamping member arranged at one end of the support to be supported on the seat to be clamped and fixed with the seat.

10. A seat, characterized by The seat comprises a seat plate, a backrest and the armrest assembly according to any one of claims 1 to 9, the seat plate being connected with the backrest, and the armrest body being movably connected with the seat plate and / or the backrest via the transmission assembly.

11. The seat of claim 10, wherein, The seat plate is provided with a connecting seat, and the support is detachably connected with the connecting seat.

12. The seat of claim 10 or 11, wherein, The seat further comprises: a driving member connected with at least the transmission assembly to drive the transmission assembly to move; a controller electrically connected with the driving member to control the driving member to start and stop.

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