Armrest assembly for movable seat unit, and movable seat unit

Abstract

An armrest assembly for a movable seat unit. The seat unit comprises linkage mechanisms (2A, 2B, 2C), and the seat unit can switch between a sitting position and an extension position by means of the linkage mechanisms (2A, 2B, 2C). The armrest assembly (1) comprises: armrest members (61) fixedly supported on the ground; and armrest substrates (101) directly fixedly connected to the armrest members (61). The armrest substrates (101) extend in the front-back direction of the seat unit, the armrest substrates (101) are directly pivotally connected to the linkage mechanisms (2A, 2C) on the sides facing the linkage mechanisms (2A, 2C), and at least one reinforcing member protruding outwards is provided on the side of each armrest substrate (101) facing the corresponding armrest member (61). The reinforcing member extends on the entire armrest member (61) in the transverse direction of the seat unit. In addition, the present application also relates to a movable seat unit.

Description

Armrest assembly for movable seat unit and movable seat unit

[0001] Technical Field

[0002] This application relates to an armrest assembly for a movable seat unit and a movable seat unit including said armrest assembly. Background Technology

[0003] Various types of movable seating are known in the prior art, such as sofas or chairs with multi-position conversion functions. As people's living standards improve, the demand for comfort in sofas and chairs is also increasing. In known designs, movable seating units typically have a linkage mechanism to achieve, for example, changes between a sitting position, a TV position, and a reclining position. When the seating unit changes from a sitting position to a TV position, the footrest extends forward, while the angle between the backrest and the seat remains essentially unchanged. When the seating unit changes from a TV position to a reclining position, the footrest extends further forward and rises upward compared to the reclining position, and the backrest reclines significantly backward. In existing designs of this type of seating unit, an auxiliary frame must be used to connect the linkage mechanism to the backrest, armrests, and seat.

[0004] However, the use of the auxiliary frame increases the number of required parts and assembly steps. On the other hand, the auxiliary frame also greatly reduces the clearance under the seat unit, thus hindering normal cleaning and maintenance. Summary of the Invention

[0005] The technical problem to be solved by this application is to provide a seat unit with a simpler structure, fewer assembly steps, and easier maintenance.

[0006] To address the aforementioned technical problems, this application provides an armrest assembly for a movable seat unit. The seat unit includes a linkage mechanism, enabling it to switch between a seated position and an extended position. The armrest assembly includes: an armrest member fixedly supported on the ground; and an armrest base plate directly fixedly connected to the armrest member. According to this application, the armrest base plate extends along the front-rear direction of the seat unit. The armrest base plate is directly pivotally connected to the linkage mechanism on its side facing the armrest member, and at least one outwardly protruding reinforcing member is provided on the side of the armrest base plate facing the armrest member. The reinforcing member extends along the transverse direction of the seat unit over the entire armrest member.

[0007] In embodiments according to this application, the extended position includes a TV position and / or a reclining position, depending on the specific structure of the seat unit to which the armrest assembly is applied.

[0008] In some embodiments, the seat unit includes a linkage mechanism with a seat frame, a backrest assembly pivotally connected to the front of the seat frame, and a leg extension device pivotally connected to the rear of the seat frame. The seat portion is attached to the seat frame, the backrest is attached to the backrest assembly, and the footstool is attached to the front end of the leg extension device. The linkage mechanism enables the seat unit to switch between at least a sitting position and a TV position and / or a reclining position. In the sitting position, the footstool is folded under the seat portion; in the TV position, the footstool extends upward and forward, and the backrest remains substantially upright; in the reclining position, the footstool is further forward and upward, and the backrest tilts backward.

[0009] In some alternative implementations, the seat unit may also change only between a sitting position and a TV position or only between a sitting position and a reclining position.

[0010] In some embodiments, the armrest is constructed in a double-layered manner, comprising an inner panel and an outer panel arranged parallel to each other in the transverse direction of the seat unit, wherein the free end of the reinforcement includes a fixed end face, wherein the armrest base plate is fixedly connected to the inner panel, and the fixed end face is fixedly connected to the outer panel.

[0011] In the embodiments according to this application, the strength of the armrest base plate is improved by incorporating a reinforcing member. The extension of the reinforcing member in the lateral direction of the seat optimizes the force distribution when the user sits on the seat unit, reducing excessively concentrated pressure on the armrest and improving the uniformity of force distribution. Therefore, the auxiliary frame that would normally be required to be installed between the linkage mechanism and the armrest can be eliminated, and a robust and reliable connection between the linkage mechanism and the armrest can be achieved solely using the armrest base plate.

[0012] In some embodiments, the reinforcing member includes a front reinforcing member, a rear reinforcing member, and a middle reinforcing member. This further achieves a uniform force distribution.

[0013] In some embodiments, the fixed end face is configured as a fixed flange.

[0014] In some embodiments, the armrest includes a bottom plate fixedly connected to the inner and outer plates. A main support leg is fixedly connected to the bottom plate, thereby securing the armrest to the ground. When the height between the main support leg and the ground is 5-14 cm, the foremost edge of the seat frame is 28-37 cm above the ground in a seated position.

[0015] In this embodiment, the main support legs are directly mounted on the armrest. Compared to the armrest, which is originally unable to support the weight of the seat unit and the user, the embodiment of this application improves the strength and stress uniformity of the armrest by using reinforcement members, so that the armrest can be firmly and reliably supported on the ground by means of the main support legs.

[0016] In some embodiments, the armrest base plate includes a base plate extension that extends upward in the height direction of the seat unit, wherein the base plate extension is fixedly connected to the inner plate of the armrest.

[0017] In some embodiments, the armrest base plate has a straight lower edge. In some embodiments, the armrest base plate extends over at least 85% of the length of the armrest member in the fore-aft direction of the seat unit. Particularly in some embodiments, the armrest base plate extends over the entire length of the armrest member in the fore-aft direction of the seat unit.

[0018] In some embodiments, the armrest assembly includes a front lateral connector and a rear lateral connector, wherein the front lateral connector and the rear lateral connector extend between two armrest base plates.

[0019] In this implementation, the front and rear lateral connectors are directly connected between the armrest base plates, thereby forming a robust frame structure that eliminates the need for the original auxiliary frame. This reduces the number of parts required under the seat unit, providing more usable space to ensure proper cleaning and maintenance, such as allowing a robotic vacuum cleaner to pass smoothly under the seat unit.

[0020] The armrest assembly according to this application can be used in single-seat or multi-seat seating units. In a single-seat movable seating unit, the seating unit includes only one seat portion, a set of armrests located on both sides of the seat portion, and a set of armrest base plates for the armrests. In a multi-seat movable seating unit, the seating unit includes multiple seat portions, a set of armrests, and a set of armrest base plates for the armrests. The armrests and their associated armrest base plates are located on the outermost side of the seating unit, while armrests are typically not provided in the middle of the seating unit, and only intermediate base plates are provided accordingly. In some embodiments, the armrest assembly further includes at least two adjacent intermediate base plates, wherein the intermediate base plates extend along the front-rear direction of the seating unit, one intermediate base plate is directly pivotally connected to the linkage mechanism on the side facing the linkage mechanism, and is fixedly connected to the other intermediate base plate on the side of the intermediate base plate opposite to the linkage mechanism.

[0021] In some embodiments, the intermediate substrate has a connector on the side opposite to the linkage mechanism, and the connector is used to achieve a fixed connection between the at least two intermediate substrates.

[0022] In some embodiments, the armrest assembly includes a front lateral connector and a rear lateral connector, wherein the front lateral connector and the rear lateral connector extend between the armrest base plate and the intermediate base plate.

[0023] In some embodiments, the armrest assembly includes auxiliary support legs, which are directly or indirectly fixedly connected to the intermediate base plate.

[0024] In some embodiments, auxiliary reinforcements are arranged between the front transverse connector and the intermediate substrate and / or between the rear transverse connector and the intermediate substrate, wherein the auxiliary support legs are fixedly connected to the auxiliary reinforcements.

[0025] The fixed connections described herein can be achieved through threaded connections, riveting, plugging, etc. When the material is suitable for welding processes, welding can also be used to achieve the fixed connection.

[0026] In some embodiments, the intermediate substrate has a straight lower edge.

[0027] In addition, to solve the aforementioned technical problem, this application also provides a movable seat unit, which includes at least one linkage mechanism and the aforementioned armrest assembly.

[0028] In some embodiments, the linkage mechanism includes a seat frame, a backrest assembly pivotally connected to the rear of the seat frame, and a leg extension device pivotally connected to the front of the seat frame. When the foremost point of the leg extension device is 28-37 cm above the ground, the foremost point of the seat frame is also 28-37 cm above the ground in a seated position.

[0029] In one embodiment, the seat unit includes at least three linkage mechanisms, wherein the armrest assembly includes two armrest base plates disposed outside the linkage mechanisms located at both ends of the seat unit and intermediate base plates disposed on the facing sides of adjacent linkage mechanisms, wherein adjacent intermediate base plates are connected to each other to connect adjacent linkage mechanisms. In some embodiments, the intermediate base plates are connected by insertion, riveting, or threaded connection.

[0030] It should be noted that the term "front-to-back direction" in this application refers to the extension direction of the leg extension device of the seat unit or mechanical extension mechanism. Specifically, "front" refers to the direction towards the leg extension device, and "rear" refers to the direction towards the backrest. "Lateral" refers to the direction perpendicular to the front-to-back direction of the seat unit or linkage mechanism on a horizontal plane; in other words, "lateral" refers to the thickness direction of the armrest of the seat unit. "Height direction" refers to the direction perpendicular to both the "front-to-back direction" and the "lateral direction." Attached Figure Description

[0031] The embodiments of this application are described in detail below with reference to the accompanying drawings.

[0032] Figure 1 schematically shows a perspective view of the movable seat unit according to this application;

[0033] Figure 2 schematically shows a rear view of the seat unit shown in Figure 1;

[0034] Figure 3 schematically shows a partial perspective view of the linkage mechanism and armrest assembly of the seat unit according to the present application, in a seated position;

[0035] Figure 4 schematically shows a partial perspective view of the linkage mechanism and handrail assembly shown in Figure 3, in the TV position;

[0036] Figure 5 schematically shows a partial perspective view of the linkage mechanism and handrail assembly shown in Figure 3, in a reclining position;

[0037] Figure 6 schematically shows another perspective view of the seat unit according to this application;

[0038] Figure 7 schematically shows a partial perspective view of the seat unit shown in Figure 6 from another angle; and

[0039] Figure 8 schematically shows a side view of the seat unit according to this application. Embodiments of the present invention

[0040] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] The term "one embodiment" or "implementation" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of this application. In the description of this application, it should be understood that the terms "upper," "lower," "left," "right," "top," "bottom," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein.

[0042] Figures 1 and 2 schematically show a perspective view and a rear view of the movable seat unit according to this application, respectively. The movable seat unit shown in Figures 1 and 2 is configured as a three-seater seat unit, which includes individually adjustable linkage mechanisms 2A, 2B, and 3C. Linkage mechanisms 2A and 2C are located on the left and right outer sides of the seat unit, respectively, while linkage mechanism 2B is located in the center. The seat unit also includes an armrest assembly 1, which includes armrest members 61 with mirror-image structures located on the left and right sides of the seat unit, an armrest base plate 101 directly fixedly connected to the armrest members 61, and a central base plate 101' located in the center of the seat unit. For example, in the embodiment shown in Figure 2, the seat unit has an armrest 61 located on the left side of the linkage mechanism 2A, an armrest base plate 101 directly fixedly connected to the armrest 61, and an intermediate base plate 101' located on the right side of the linkage mechanism 2A; an armrest 61 located on the right side of the linkage mechanism 2C, an armrest base plate 101 directly fixedly connected to the armrest 61, and an intermediate base plate 101' located on the left side of the linkage mechanism 2C; and two intermediate base plates 101' located on the left and right sides of the linkage mechanism 2B in the middle. That is, the adjacent linkage mechanisms 2A and 2B each have their own intermediate base plates 101' on their facing sides, and correspondingly, the adjacent linkage mechanisms 2B and 2C also have their own intermediate base plates 101' on their facing sides. By connecting these four intermediate base plates 101', the linkage mechanisms 2A, 2B, and 2C are connected side by side. The connection of the intermediate base plates can be achieved by riveting, threaded connection, plugging, etc.

[0043] This modular construction method allows for the addition or reduction of linkage mechanisms, or seats, within the seat unit according to the required length, thus improving the scalability of the seat unit.

[0044] The above three-seater seat unit is only an example. It can be increased to a longer seat unit such as a four-seater or a five-seater as needed. To do this, it is only necessary to disconnect the connection of the corresponding intermediate base plate.

[0045] When the seat unit is constructed as a single-seat seat unit, the seat unit includes only one linkage mechanism, a pair of armrests 61 located on the left and right sides of the linkage mechanism, and a pair of armrest base plates 101 directly fixedly connected to the armrests 61.

[0046] For clarity, Figures 3 to 5 use the left side of the seat unit in Figure 1 as an example to schematically show the linkage mechanism 2A and the corresponding armrest assembly 1.

[0047] Exemplarily, the linkage mechanism 2A includes a multi-link mechanism and is configured to allow the seat unit to switch between a sitting position and an extended position. In this embodiment, the extended position includes a TV position and a reclining position. However, this application is not limited thereto. In other embodiments not shown, the extended position may also include only the TV position or the reclining position.

[0048] It should also be noted that the application of the handrail component 1 according to this application is not limited to the linkage mechanism shown in the accompanying drawings. In fact, the linkage mechanism shown in Figures 3 to 5 is merely illustrative, and the linkage mechanism can be constructed in many different ways, as long as it can be adapted to the handrail component according to this application.

[0049] As exemplarily shown in Figures 3 to 7, the seat unit is constructed as a floor-standing seat unit with armrests, which includes a linkage mechanism 2A and an armrest assembly 1. The linkage mechanism 2A includes linkage mechanism halves arranged mirror-symmetrically on the left and right sides. The armrest assembly 1 is disposed on both sides of the linkage mechanism 2A, and includes an armrest base plate 101 and an intermediate base plate 101', wherein the armrest base plate 101 is directly fixedly connected to an armrest member 61 (not shown in the figures), and the intermediate base plate 101' is fixedly connected to an intermediate base plate of an adjacent seat unit (not shown).

[0050] The armrest 61 has a double-layer structure, which includes an inner panel 611 and an outer panel 612 arranged in parallel to each other in the transverse direction of the seat unit, and a bottom panel 613 connecting the inner panel and the outer panel, thereby the armrest 61 surrounds a hollow cavity.

[0051] The armrest base plate 101 of the armrest assembly 1 extends along the entire length of the armrest member 61 in the front-back direction of the seat unit and is constructed in a substantially straight line, wherein, in particular, the lower edge of the armrest base plate 101 extends in a straight line.

[0052] At least one outwardly protruding reinforcing member is provided on the side of the armrest base plate 101 facing outwards, i.e., facing the armrest member 61. As shown in FIG3, there are three reinforcing members: a front reinforcing member 102, a rear reinforcing member 103, and a middle reinforcing member 104. These three reinforcing members extend along the transverse direction of the seat unit over the entire thickness of the armrest member 61. The free ends of the reinforcing members each include a fixed end face. As shown in FIG3, the free end of the middle reinforcing member 104 is preferably constructed as a fixed flange, which is flush with the free ends of the front reinforcing member 102 and the rear reinforcing member 103, and together they are fixedly connected to the outer plate 612 of the armrest member 61. The armrest base plate 101 is fixedly connected to the inner plate 611 of the armrest member 61. Thus, the armrest base plate 101, together with the reinforcing members, is fixedly connected to the armrest member 61 from both sides.

[0053] By installing reinforcing members on the armrest base plate, the force distribution on the seat unit, especially the armrest, is improved when the user sits down, thus increasing the strength of the armrest. As a result, a main support leg 108 can be fixedly connected to the bottom plate 613 of the armrest 61 to support the armrest 61 and even the entire seat unit on the ground.

[0054] The armrest base plate 101 also includes a base plate extension 107 that protrudes upward in the height direction of the seat unit, wherein the base plate extension 107 is fixedly connected to the inner plate 611 of the armrest member 61.

[0055] The intermediate base plate 101' is located on the other side of the linkage mechanism 2A, and it also runs along the front-back direction of the seat unit, preferably having the same length as the armrest base plate 101. Unlike the armrest base plate 101, since the intermediate base plate 101' does not need to be directly fixedly connected to the armrest, it does not have a reinforcing member. Instead, a connector is provided on the side of the intermediate base plate 101' facing away from the linkage mechanism 2A, which allows it to be fixedly connected to another adjacent intermediate base plate. Preferably, the intermediate base plate 101' has an auxiliary extension 107' that protrudes upward along the height direction of the seat unit, and a connector is also provided on the side facing away from the linkage mechanism 2A. This connector allows it to be fixedly connected to the auxiliary extension of another adjacent intermediate base plate, thereby achieving a stable connection between the two intermediate base plates.

[0056] For a three-seater seat unit, in the outer seat unit portion, to further improve structural stability, a front lateral connector 105 and a rear lateral connector 106 are provided between the armrest base plate 101 and the middle base plate 101'. In some embodiments, the rear lateral connector 106 is fixedly connected to the armrest base plate 101 and the middle base plate 101' at both ends by means of auxiliary reinforcing members 109. In the middle seat unit portion, for example in the seat unit portion with linkage mechanism 2B, the front lateral connector 105 and the rear lateral connector 106 are provided between the two middle base plates 101'.

[0057] For single-seat units, to further improve structural stability, a front lateral connector 105 and a rear lateral connector 106 are provided in front of the two armrest base plates 101.

[0058] For a three-seater seat unit, an auxiliary support leg 108' can also be provided on the intermediate base plate 101' of the armrest assembly. In some embodiments, the auxiliary support leg 108' is provided on the auxiliary reinforcement 109.

[0059] For single-seat units, only the main support leg can be installed, while the auxiliary support leg can be omitted.

[0060] For a single-seat seating unit, the linkage mechanism is located between the two armrest base plates. For a multi-seat seating unit, the linkage mechanism is provided between the corresponding armrest base plates and the intermediate base plate, and alternatively, a linkage mechanism is also provided between the two intermediate base plates. For example, as shown in Figures 6 and 7, 2A is located between the armrest base plate 101 and the intermediate base plate 101', and the connection between the linkage mechanism 2A and the armrest base plate 101 and the intermediate base plate 101' is basically the same. For the sake of simplicity, the following description only uses the connection method between the linkage mechanism 2A and the armrest base plate 101 as an example.

[0061] For example, the linkage mechanism 2A includes a seat frame 210, a backrest assembly 22 pivotally connected to the rear of the seat frame 210, and a leg extension device 23 pivotally connected to the front of the seat frame 210.

[0062] The backrest assembly 22 includes a backrest bracket 221 for attaching the backrest 62, and also includes a backrest link 222 and a crank 223.

[0063] The backrest support 221 has an approximately L-shaped structure. Its upper part is fixedly connected to the backrest 62, its front end is connected to the seat frame 210 by a backrest connecting rod 222, and its rear end is connected to the seat frame 210 by a crank 223.

[0064] The crank member 223 includes three pivot points located at its upper, lower, and middle ends. The upper pivot point is pivotally connected to the rear end of the backrest support 221, and the middle pivot point is pivotally connected to the rear end of the seat frame 210. Furthermore, the lower pivot point of the crank member 223 is also pivotally connected to the side of the armrest base plate 101 facing the linkage mechanism via a central connecting rod of the linkage mechanism.

[0065] In addition, the linkage mechanism also includes a front pivot rod 217, a rear pivot rod 218 and a transmission assembly. The front pivot rod 217 and the rear pivot rod 218 are respectively pivotally connected at their lower ends to the side of the armrest base plate 101 facing the linkage mechanism, and are respectively pivotally connected at their lower ends to the transmission assembly.

[0066] The transmission assembly can include a variety of different configurations. For example, in the embodiments shown in Figures 3 to 7, the transmission assembly can include a front swing arm 213, a rear swing arm 214, an intermediate connecting rod 215, a secondary front swing arm 217, a secondary rear swing arm 218, and a secondary intermediate connecting rod 219a.

[0067] The front end of the secondary intermediate link 219a is pivotally connected to the top end of the secondary front swing arm 217. In addition, a follower link 219b is pivotally connected between the middle part of the secondary intermediate link 219a and the top end of the secondary rear swing arm 218.

[0068] The upper ends of the front swing arm 213 and the rear swing arm 214 are pivotally connected to the seat frame 210, and the intermediate connecting rod 215 is pivotally connected between the front swing arm 213 and the rear swing arm 214. Furthermore, a seat frame linkage rod 216 is pivotally connected between the front end of the intermediate connecting rod 215 and the seat frame 210. Thus, the seat frame 210, the front swing arm 213, the rear swing arm 214, and the intermediate connecting rod 215 constitute a four-bar linkage.

[0069] According to this application, the armrest base plate 101 is directly fixedly connected to the armrest member 61 on its side facing the armrest member 61, and directly pivotally connected to the linkage mechanism on its side facing the linkage mechanism. Thus, the linkage mechanism is "suspended" and connected to the armrest member solely by means of the armrest base plate 101 and the reinforcing members fixed to it. Because an additional auxiliary frame is eliminated, sufficient space is provided under the seat unit, allowing for cleaning and maintenance without increasing the overall height of the seat, or even by appropriately reducing the overall height. Furthermore, due to its simple structure, it does not interfere with other components of existing seat units. The armrest assembly 1 according to this application can also be applied to various seat units, such as "zero gravity" and "zero wall" seat units.

[0070] When the seat unit begins to extend from the sitting position shown in Figure 3, the leg extension device 23 extends forward and drives the seat frame 210 to move forward, thereby causing the front swing arm 213 and the rear swing arm 214 to tilt forward about their pivot points on the intermediate link 215, respectively.

[0071] When the seat frame linkage 216 is moved forward to its limit position, i.e., when the TV posture position shown in Figure 4 is reached, if the leg extension device 23 continues to extend in the same direction, the intermediate link 215, together with the seat frame 210, moves forward, thereby causing the secondary front swing arm 217 and the secondary rear swing arm 218 to pivot forward around their lower ends at the pivot point with respect to the armrest base plate 101. Furthermore, the crank 223 tilts around its lower end at the pivot point towards the leg extension device, thereby pushing the backrest support 221 forward as a whole, and further tilting the upper part of the backrest support 221 backward, reducing the angle of the backrest link 222 relative to the seat frame 210. This achieves the reclining position shown in Figure 5.

[0072] During changes in the posture of the seat unit, the sitting position often requires more space underneath the seat unit. As mentioned earlier, in the seat unit according to this application, the auxiliary frame is omitted, allowing for a larger space underneath the seat unit even when the height of the seat portion remains unchanged or is even appropriately lowered. In particular, as shown in Figure 8, when the height H1 between the main support leg 108 and the ground E0 is 5-14cm, the foremost end of the seat frame 210 is 28-37cm above the ground E0 in the sitting position.

[0073] In some embodiments, the linkage mechanism can achieve attitude changes under the drive of a linear electric actuator. However, in alternative embodiments, the linkage mechanism can also be manual or a combination of manual and motor drive.

Claims

1. An armrest assembly for a movable seat unit, the seat unit including a linkage mechanism with a seat frame, the seat unit being able to change between a seated position and an extended position by means of the linkage mechanism. The armrest assembly includes: - Handrail components that are fixedly supported on the ground; - A handrail base plate that is directly fixedly connected to the handrail component. The armrest base plate extends along the front-rear direction of the seat unit. The armrest base plate is directly pivotally connected to the linkage mechanism on the side facing the linkage mechanism. At least one reinforcing member protruding outward is provided on the side of the armrest base plate facing the armrest member. The reinforcing member extends along the transverse direction of the seat unit over the entire armrest member.

2. The armrest assembly according to claim 1, wherein, The armrest has a double-layer structure, comprising an inner panel and an outer panel arranged parallel to each other in the transverse direction of the seat unit. The free end of the reinforcing member includes a fixed end face. The armrest base plate is fixedly connected to the inner panel, and the fixed end face is fixedly connected to the outer panel.

3. The armrest assembly according to claim 2, wherein, The reinforcing members include a front reinforcing member, a rear reinforcing member, and a middle reinforcing member.

4. The armrest assembly according to claim 3, wherein, The fixed end face is constructed as a fixed flange.

5. The armrest assembly according to claim 2, wherein, The handrail component includes a bottom plate that is fixedly connected to the inner plate and the outer plate.

6. The armrest assembly according to claim 5, wherein, A main support leg is fixedly connected to the bottom plate, and the handrail is fixedly supported on the ground by the main support leg.

7. The armrest assembly according to claim 6, wherein, When the height between the main support leg and the ground is 5-14cm, the height of the front end of the seat frame relative to the ground in the sitting position is 28-37cm.

8. The armrest assembly according to claim 2, wherein, The armrest base plate includes a base plate extension that protrudes upward in the height direction of the seat unit, wherein the base plate extension is fixedly connected to the inner plate of the armrest.

9. The armrest assembly according to claim 1, wherein, The armrest base plate has a straight lower edge.

10. The armrest assembly according to claim 1, wherein, The armrest base plate extends over at least 85% of the length of the armrest in the front-back direction of the seat unit.

11. The armrest assembly according to claim 10, wherein, The armrest base plate extends along the entire length of the armrest in the front-back direction of the seat unit.

12. The armrest assembly according to claim 1, wherein, The armrest assembly includes a front lateral connector and a rear lateral connector, wherein the front lateral connector and the rear lateral connector extend between two armrest base plates.

13. The armrest assembly according to claim 1, wherein, The armrest assembly also includes at least two adjacent intermediate base plates, wherein the intermediate base plates extend along the front-rear direction of the seat unit, one of the intermediate base plates is directly pivotally connected to the linkage mechanism on the side facing the linkage mechanism, and is fixedly connected to the other intermediate base plate on the side of the intermediate base plate away from the linkage mechanism.

14. The armrest assembly according to claim 13, wherein, The intermediate substrate has a connector on the side opposite to the linkage mechanism, and the connector is used to achieve a fixed connection between the at least two intermediate substrates.

15. The armrest assembly according to claim 13, wherein, The armrest assembly includes a front lateral connector and a rear lateral connector, wherein the front lateral connector and the rear lateral connector extend between the armrest base plate and the middle base plate.

16. The armrest assembly according to claim 15, wherein, The handrail assembly includes auxiliary support legs, wherein the auxiliary support legs are directly or indirectly fixedly connected to the intermediate base plate.

17. The armrest assembly according to claim 16, wherein, An auxiliary reinforcing member is arranged between the front transverse connecting member and the intermediate base plate and / or between the rear transverse connecting member and the intermediate base plate, wherein the auxiliary support leg is fixedly connected to the auxiliary reinforcing member.

18. The armrest assembly according to claim 13, wherein, The intermediate substrate has a straight lower edge.

19. A movable seat unit, the seat unit comprising at least one linkage mechanism and an armrest assembly as described in any one of the preceding claims.

20. The seat unit according to claim 19, wherein, The linkage mechanism includes a seat frame, a backrest assembly pivotally connected to the rear of the seat frame, and a leg extension device pivotally connected to the front of the seat frame.

21. The seat unit according to claim 19, wherein, When the height of the foremost part of the leg extension device relative to the ground is 28-37cm, the height of the foremost part of the seat frame relative to the ground in the seated position is also 28-37cm.

22. The seat unit according to claim 19, wherein, The seat unit includes at least three linkage mechanisms, wherein the armrest assembly includes two armrest base plates arranged on the outside of the linkage mechanisms located at both ends of the seat unit, armrest members connected to the armrest base plates, and intermediate base plates arranged on the mutually facing sides of adjacent linkage mechanisms, wherein adjacent intermediate base plates are connected to each other, thereby connecting adjacent linkage mechanisms.

23. The seat unit according to claim 22, wherein, The intermediate substrates are connected by plugging, riveting or threading.

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