Adjustable armrest assembly and seat

Abstract

This utility model discloses an adjustable armrest assembly and a seat. The adjustable armrest assembly includes an armrest handle, a fixed rod, a movable rod, at least two limiting members, and at least two elastic members. The movable rod can move up and down relative to the fixed rod, and the armrest handle is connected to the movable rod. The fixed rod is provided with at least two limiting parts, each of which includes multiple vertically arranged locking parts. Any two locking parts in all limiting parts are staggered in the vertical direction. The limiting members correspond one-to-one with the limiting parts, and each limiting member includes a connecting part and a locking part that cooperates with the locking part. The connecting part is movably connected to the armrest handle or the movable rod so that the locking part can move between a first position engaged with the locking part and a second position disengaged from the locking part. This utility model can provide stable support for the user's arms, shorten the interval between adjacent positions, and improve the adjustment accuracy of the armrest handle by making each adjustment relatively small.

Description

Technical Field

[0001] This utility model relates to the field of seating technology, specifically to an adjustable armrest assembly and a seat. Background Technology

[0002] To enhance seating comfort, many office and study chairs feature armrests on both sides of the seat cushion. These armrests support the user's arms and prevent fatigue caused by unsupported arms. To accommodate users of different body types and postures, some armrests are height-adjustable. However, to ensure stable arm support during adjustment, existing armrest adjustment mechanisms often employ multiple settings with large intervals between settings, resulting in low precision and difficulty in adjusting the armrests to a height perfectly aligned with the desktop. Utility Model Content

[0003] The purpose of this invention is to provide an adjustable armrest assembly and seat that improves the adjustment accuracy of the armrest while providing stable support for the user's arms.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] An adjustable handrail assembly includes a handrail handle, a fixed rod, a movable rod, at least two limiting elements, and at least two elastic elements;

[0006] The movable rod can move up and down relative to the fixed rod, and the handle is connected to the movable rod; the fixed rod is provided with at least two limiting parts, each limiting part including multiple locking parts arranged vertically, and any two locking parts in all the limiting parts are staggered in the vertical direction.

[0007] Each limiting member corresponds to a limiting part. The limiting member includes a connecting part and a locking part that cooperates with the locking part. The connecting part is movably connected to the handle or movable rod so that the locking part can move between a first position engaged with the locking part and a second position separated from the locking part. Each elastic member corresponds to a limiting member. The elastic member is used to apply elastic stress to the corresponding limiting member so that the locking part always tends to move towards the first position. When the locking part of one of the limiting members is in the first position, the locking parts of the other limiting members are limited to the second position by the fixing rod.

[0008] Preferably, the locking portions of all limiting members are located at the same height, and the portion of the fixing rod located between two adjacent locking portions of the same limiting member forms a stop portion. In the two adjacent limiting members, the locking portion of one limiting member is set at the same height as the stop portion of the other limiting member.

[0009] Preferably, the fixing rod is a hollow structure with an open top, and the limiting member is a rod extending vertically. It is inserted into the fixing rod through the top opening of the fixing rod so that the locking part is located inside the fixing rod. The connecting part is located at the top of the limiting member and is pivotally connected to the movable rod or handle. The locking part is a boss that bends from the bottom of the limiting member toward the inner wall of the fixing rod, and the locking part is a slot that extends outward from the inner wall of the fixing rod.

[0010] Preferably, a pivot is provided at the top of the movable rod, and the connecting parts of at least two limiting members are pivotally connected to the pivot. A support wall is provided on the side of the limiting member away from the boss. One end of the elastic member abuts against the support wall and the other end abuts against the handle or movable rod to apply downward elastic stress to the support wall.

[0011] Preferably, the support walls on all the limiting members are at the same height, and a push switch that can move up and down relative to the movable rod is installed on the movable rod. The push switch is located below the support walls of all the limiting members.

[0012] Preferably, the top of the inner surface of the movable rod is provided with two mounting slots with top openings, the two mounting slots are arranged opposite each other, and the two ends of the rotating shaft are respectively embedded into the two mounting slots from top to bottom. A pressure cap is provided at the bottom of the handle, the pressure cap is detachably fixed to the top of the movable rod and seals the two ends of the rotating shaft into the two mounting slots respectively.

[0013] Preferably, the upper surface of the support wall is provided with an upwardly protruding limiting post, the lower surface of the pressure cap is provided with a limiting groove, and the elastic element is a spring, the lower end of which is sleeved on the limiting post and the upper end is embedded in the limiting groove.

[0014] Preferably, the fixed rod includes two opposing first sidewalls and two opposing second sidewalls, the width of the two first sidewalls being greater than the width of the two second sidewalls so that the cross-section of the fixed rod forms a non-rotating body, and the movable rod is sleeved on the outside of the fixed rod so that the movable rod can slide relative to the fixed rod in the vertical direction; all limiting parts are provided on the same first sidewall of the fixed rod.

[0015] Preferably, the movable rod is sleeved on the outside of the fixed rod so that the movable rod can slide relative to the fixed rod in the vertical direction. An installation gap is formed between the movable rod and the fixed rod. The limiting member is inserted from the top of the installation gap so that the snap-fit ​​part of the limiting member is placed in the installation gap. The limiting part is set on the outer surface of the fixed rod and located in the installation gap.

[0016] The seat, including the aforementioned adjustable armrest assembly.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] This invention features two or more limiting components, with a limiting part on each limiting component on the fixed rod. The engaging part of one limiting component engages with the corresponding locking part of the limiting part, thus limiting the degree of freedom of the vertical movement of the movable and fixed rods and providing support between them. This allows the handle to provide stable support for the user's arm. Because two or more limiting components are used, and two or more corresponding limiting parts are provided on the fixed rod, any two locking parts of all limiting parts are staggered vertically, shortening the interval between adjacent positions. This results in a relatively smaller adjustment distance for each handle adjustment, improving the adjustment accuracy of the handle. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is an installation diagram of the present invention;

[0021] Figure 3 This is a schematic diagram of the assembly of the limiting component and the movable rod;

[0022] Figure 4 This is a schematic diagram of one working state of the present invention;

[0023] Figure 5 This is a schematic diagram of another working state of the present invention;

[0024] Figure 6 This is a schematic diagram of the structure of the limiting component of this utility model.

[0025] The components are as follows: 10. Handle; 11. Pressure cover; 111. Limiting groove; 20. Fixing rod; 201. First side wall; 202. Second side wall; 21. Limiting part; 211. Slot; 212. Stop part; 22. Limiting part; 221. Slot; 222. Stop part; 30. Movable rod; 31. Mounting groove; 40. Limiting component; 41. Connecting part; 42. Boss; 43. Support wall; 44. Limiting post; 50. Limiting component; 51. Connecting part; 52. Boss; 53. Support wall; 54. Limiting post; 60. Rotating shaft; 71. Spring; 72. Spring; 80. Press switch. Detailed Implementation

[0026] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. Unless otherwise specified, the materials and equipment used in this embodiment are all commercially available. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0027] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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 on this application. In the description of this application, "a plurality of" means two or more, unless otherwise precisely specified.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected," "linked," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a connection through an intermediary, or a connection within two elements or an interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0029] like Figure 1 , 2 As shown in Figures 3, 4, 5, and 6, this utility model discloses an adjustable handrail assembly, which includes a handle 10, a fixed rod 20, a movable rod 30, a limiting member 40, a limiting member 50, a spring 71, and a spring 72. The movable rod 30 can move relative to the fixed rod 20 in the vertical direction. Specifically, the movable rod 30 can be configured as a hollow tubular structure, and the movable rod 30 can be sleeved on the outside of the fixed rod 20 so that the movable rod 30 can slide up and down relative to the fixed rod 20. The cross-sectional shapes of the two can be reasonably set, for example, the cross-sectional shapes of the two mating parts can be set as non-rotational bodies to prevent the movable rod 30 from rotating relative to the fixed rod 20 when it slides up and down. The handle 10 is connected to the top of the movable rod 30, and a support surface for supporting the user's arm is formed on the top surface of the handle 10. The fixed rod 20 is provided with a limiting part 21 and a limiting part 22, which correspond to the limiting member 40 and the limiting member 50, respectively.

[0030] The limiting part 21 includes multiple slots 211 arranged vertically, and the limiting part 22 includes multiple slots 221 arranged vertically. Any two slots in the vertical direction are staggered from each other. That is, at the same height position, there is only one slot 211 or one slot 221. Slots 211 and slots 221 have the same size, and the interval between adjacent slots 211 is equal to the interval between adjacent slots 221. When the slots 211 and slots 221 are processed on the fixing rod 20, the vertically arranged column of slots 211 and the vertically arranged column of slots 221 are staggered to achieve the above-mentioned staggered arrangement of any two slots in the vertical direction.

[0031] The limiting member 40 has the same structure as the limiting member 50. The limiting member 40 includes a connecting part 41 and a boss 42 corresponding to the slot 211 of the limiting part 21. The shape and size of the boss 42 and the slot 211 are appropriately set so that the boss 42 can be embedded in the slot 211. The connecting part 41 is movably connected to the handle 10 or the movable rod 30, so that the boss 42 on the limiting member 40 has the freedom of lateral movement relative to the fixed rod 20. This allows the boss 42 to be in a first position engaged with the slot 211 and a second position separated from the slot 211. Inter-motion; Similar to the limiting member 40, the limiting member 50 includes a connecting part 51 and a boss 52 corresponding to the slot 221 of the limiting part 22. The shape and size of the boss 52 and the slot 221 are appropriately set so that the boss 52 can be embedded in the slot 221. The connecting part 51 is movably connected to the handle 10 or the movable rod 30, so that the boss 52 of the limiting member 50 has the freedom of lateral movement relative to the fixed rod 20, thereby allowing the boss 52 to move between a first position in which it is embedded in the slot 221 and engaged with the slot 221 and a second position in which it is separated from the slot 221.

[0032] The aforementioned spring 71 is provided corresponding to the limiting member 40, and is used to apply an elastic stress to the limiting member 40, so that the boss 42 of the limiting member 40 always tends to move towards the first position. The spring 72 is provided corresponding to the limiting member 50, and is used to apply an elastic stress to the limiting member 50, so that the boss 52 of the limiting member 50 always tends to move towards the first position. When the boss 42 of the limiting member 40 is in the first position, the boss 52 of the limiting member 50 is in the second position; when the boss 52 of the limiting member 50 is in the first position, the boss 42 of the limiting member 40 is in the second position. That is to say, only one boss of the limiting member will be inserted into the slot of the limiting part corresponding to that limiting member.

[0033] like Figure 4As shown, the boss 42 of the limiting member 40 is in the first position, that is, the boss 42 is embedded in one of the slots 211 of the limiting part 21. The limiting member 40 limits the degree of freedom of the movable rod 30 and the fixed rod 20 to move up and down. Through the interaction between the boss 42 and the slot 211, the downward pressure from the user's arm on the handle 10 is transmitted to the fixed rod 20 through the limiting member 40, ensuring that the support surface of the handle 10 can provide stable support for the user's arm. See also Figure 4 and Figure 5 When the support surface of the handle 10 is at a low height, the first limiting member 40 and the second limiting member 50 move simultaneously, causing the boss 42 and the boss 52 to move to the second position, pulling the handle 10 upward a small distance. The limiting members 40 and 50 move upward with the handle 10. After moving upward a small distance, the boss 52 of the limiting member 50 is located at the position corresponding to the slot 221. Under the elastic stress of the spring 72, the boss 52 moves towards the first position and is locked in the slot 221. At this time, the boss 42 of the limiting member 40 will not engage with any slot 211. The limiting member 50 limits the degree of freedom of the movable rod 30 and the fixed rod 20 to move up and down, while ensuring that the support surface of the handle 10 can provide stable support for the user's arm.

[0034] It should be noted that the components used to engage the limiting member with the limiting part on the fixed rod 20 are not limited to bosses and slots. Bosses can be other engaging parts provided on the limiting member, and slots can be other locking parts provided on the fixed rod 20 that can engage with the engaging parts. In short, it is necessary to ensure that the engaging parts engage with the locking parts when the limiting member is in the first position, so that the limiting member can limit the degree of freedom of the up and down movement of the movable rod 30 and the fixed rod 20, and that the limiting member can form a rigid support between the movable rod 30 and the fixed rod 20.

[0035] In this invention, two or more limiting members are provided, and a limiting part is configured for each limiting member on the fixed rod 20. The locking part of one of the limiting members engages with the locking part of the corresponding limiting part, thereby limiting the degree of freedom of the vertical movement of the movable rod 30 and the fixed rod 20, and providing support between the movable rod 30 and the fixed rod 20, so that the handle 10 can provide stable support for the user's arm. Since two or more limiting members are used, and two or more limiting parts are correspondingly provided on the fixed rod 20, any two locking parts of all the limiting parts are staggered in the vertical direction, shortening the interval distance between adjacent gears, making the adjustment distance of the handle 10 relatively small each time, and improving the adjustment accuracy of the handle 10.

[0036] In a preferred embodiment, the boss 42 of the limiting member 40 and the boss 52 of the limiting member 50 are at the same height. A stop 212 is formed on the portion of the fixing rod 20 between two adjacent slots 211 of the limiting portion 21, and a stop 222 is formed on the portion of the fixing rod 20 between two adjacent slots 221 of the limiting portion 22. Since the multiple slots 211 and 221 are staggered in the vertical direction, the multiple stops 212 and 222 are also staggered in the vertical direction. Specifically, the slots 211 and 222 are at the same height, and the stops 212 and 221 are at the same height. Thus, the multiple slots 211 and 221 are staggered in the vertical direction.

[0037] See Figure 4 As shown, in the height direction, when the boss 42 of the limiting member 40 is in the first position engaged in one of the slots 211, the boss 52 of the limiting member 50 is abutted against the stop portion 222, and the stop portion 222 limits the boss 52 to the second position; as Figure 5 As shown, the movable rod 30 moves upward a distance a (i.e., the boss 52 of the limiting member 50 moves upward a distance a), the distance between two adjacent slots 221 is b, and similarly, the distance between two adjacent slots 211 is also b; combined with Figure 4 In the state shown, the boss 52 of the limiting member 50 and the stop portion 222 are at the same height, therefore, the upward movement distance a of the boss 52 is less than the distance b.

[0038] The fixed rod 20 is a hollow structure with an open top. The limiting members 40 and 50 are both rod-shaped extending vertically. The limiting members 40 and 50 are inserted into the fixed rod 20 through the top opening of the fixed rod 20, so that the boss 42 of the limiting member 40 and the boss 52 of the limiting member 50 are placed inside the fixed rod 20. The connecting part 41 is located on the top of the limiting member 40 and is pivotally connected to the movable rod 30 or the handle 10, so that the connecting part 41 can swing left and right relative to the movable rod 30, and then the boss 42 can move laterally when the limiting member 40 swings to move between the first position and the second position. The connecting part 51 is located on the top of the limiting member 50 and is pivotally connected to the movable rod 30 or the handle 10, so that the connecting part 51 can swing left and right relative to the movable rod 30, and then the boss 52 can move laterally when the limiting member 50 swings to move between the first position and the second position.

[0039] Boss 42 protrudes from the bottom of limiting member 40 toward the inner wall of fixing rod 20, and boss 52 protrudes from the bottom of limiting member 50 toward the inner wall of fixing rod 20. Slots 211 and 221 both extend outward from the inner wall of fixing rod 20 to its outer wall surface. Because fixing rod 20 is designed as a hollow structure, this hollow structure provides installation space for limiting members 40 and 50, making the entire handrail assembly more compact. To facilitate the pivotal connection of the limiting members 40 and 50 with the movable rod 30 or the handrail 10, a pivot 60 is provided at the top of the movable rod 30. The connecting part 41 at the top of the limiting member 40 is pivotally connected to the pivot 60. Similarly, the connecting part 51 at the top of the limiting member 50 is pivotally connected to the pivot 60. A support wall 43 is provided on the side of the limiting member 40 away from the boss 42, and a support wall 53 is provided on the side of the limiting member 50 away from the boss 52. The lower end of the spring 71 abuts against the support wall 43, and the upper end abuts against the handrail. On the handle 10, the spring 71 applies downward pressure to the support arm 43, thereby causing the limiting member 40 to maintain a lateral swing tendency, and thus causing the boss 42 to always move towards the limiting part 21 in the lateral direction; the lower end of the spring 72 abuts against the support wall 53 and the upper end abuts against the handle 10, and the spring 72 applies downward pressure to the support wall 53, thereby causing the limiting member 50 to maintain a lateral swing tendency, and thus causing the boss 52 to always move towards the limiting part 22 in the lateral direction.

[0040] It should be noted that springs 71 and 72 can also be replaced by other elastic components, such as sheet springs, elastic rubber components, etc.

[0041] To facilitate the installation of the pivot 60, two top-opening mounting slots 31 are provided on the top of the inner surface of the movable rod 30. The two mounting slots 31 are arranged opposite each other, and both ends of the pivot 60 are respectively embedded into the two mounting slots 31 from top to bottom. A pressure cap 11 is connected to the bottom of the handle 10. The pressure cap 11 is detachably fixed to the top of the movable rod 30 by screws. The pressure cap 11 is used to seal both ends of the pivot 60 into the two mounting slots 31. During assembly, the connecting part 41 of the limiting member 40 and the connecting part 51 of the limiting member 50 are pivotally connected to the pivot 60. The connecting part 41 and the connecting part 51 can be a structure with shaft holes. After the rotating shaft 60 passes through the connecting part 41 and the connecting part 51, the limiting member 40 and the limiting member 50 are placed inside the movable rod 30 from top to bottom through the top of the movable rod 30. The two ends of the rotating shaft 60 are respectively embedded in the two mounting grooves 31. Then, the springs 71 and 72 are placed on the support wall 43 and the support wall 53 respectively. Finally, the pressure cover 11 is fixed to the top of the movable rod 30 by screws or other detachable connection methods to press down the rotating shaft 60 and the springs 71 and 72.

[0042] To facilitate the installation of springs 71 and 72, an upwardly protruding limiting post 44 is provided on the upper surface of the support wall 43 of the limiting member 40, and an upwardly protruding limiting post 54 is provided on the upper surface of the support wall 53 of the limiting member 50. Two limiting grooves 111 are provided on the lower surface of the pressure cover 11. The lower end of spring 71 is sleeved on the limiting post 44 and the upper end is embedded in one of the limiting grooves 111. The lower end of spring 72 is sleeved on the limiting post 54 and the upper end is embedded in the other limiting groove 111.

[0043] A push-button switch 80, which can move up and down relative to the movable rod 30, is installed on the movable rod 30. The support wall 43 and the support wall 53 are at the same height. The push-button switch 80 is located below the support wall 43 of the limiting member 40 and the support wall 53 of the limiting member 50. When the push-button switch 80 is pushed upward, the push-button switch 80 can push the support wall 43 or the support wall 53 upward. When the handrail assembly is in Figure 4 In the indicated state, since the boss 42 of the limiting member 40 is in the first position, the support wall 43 has a relatively low position. The boss 52 of the limiting member 50 is abutted by the stop part 222, and the support wall 53 is in a relatively high position. At this time, pushing the press switch 80 upward will push the support wall 43 upward. After the support wall 43 is pushed upward, the boss 42 disengages from the slot 211, causing the boss 42 to move to the second position. At this time, the movable rod 30 is no longer locked by the limiting member 40, and the handle 10 is moved upward to... Figure 5 In the state shown, the boss 52 of the limiting member 50 moves to the same height as the slot 221, releasing the external force on the push switch 80. The spring 72 returns to its original position, pushing the support wall 53 downward. After the limiting member 50 swings, the boss 52 moves to the first position embedded in the slot 221, while the boss 42 of the limiting member 40 is limited to the second position by the stop part 212.

[0044] The fixed rod 20 includes two opposing first sidewalls 201 and two opposing second sidewalls 202. The width of the two first sidewalls 201 is greater than the width of the two second sidewalls 202, so that the cross-section of the fixed rod 20 forms a flat structure, that is, the cross-section of the fixed rod 20 is a non-rotational structure. After the movable rod 30 is sleeved on the fixed rod 20, the movable rod 30 slides up and down relative to the fixed rod 20 and prevents the movable rod 30 from rotating relative to the fixed rod 20. The limiting part 21 and the limiting part 22 are arranged on the same first sidewall 201 of the fixed rod 20. Since the first sidewall 201 has a relatively large width, the limiting part 21 and the limiting part 22 are arranged on the first sidewall 201 so that the slot 211 of the limiting part 21 and the slot 221 of the limiting part 22 have sufficient size, thereby making the boss 42 on the limiting member 40 and the boss 52 on the limiting member 50 have large size to provide sufficient support strength.

[0045] In other embodiments, the present invention includes three or more limiting members, corresponding to three or more limiting portions provided on the fixing rod 20. The first sidewall 201 with a larger width dimension facilitates the arrangement of multiple limiting portions on the same first sidewall 201. In the present invention, the multiple limiting members can be matched one-to-one with multiple limiting portions on the same side of the fixing rod 20, or the limiting portions can be arranged on both sides of the fixing rod 20. For example, limiting portions can be provided on both first sidewalls 201, or limiting portions can be provided on both the first sidewall 201 and the second sidewall 202.

[0046] In the above structure, the limiting member is pivotally connected to the handle 10 or the movable rod 30, so that the locking part on the limiting member has the freedom to move between the first position and the second position. It should be noted that in order to enable the locking part on the limiting member to move between the first position and the second position, the limiting member can be connected to the movable rod 30 in other movable mounting methods. For example, the limiting member can be connected to the movable rod 30 in a straight line extending laterally. An elastic member is used to apply elastic stress to the limiting member, so that the locking part on the limiting member always tends to move towards the first position to engage with the locking part on the fixed rod 20.

[0047] In other embodiments, to ensure sufficient strength of the fixed rod 20, the fixed rod 20 can be made into a solid structure, and the movable rod 30 can be slidably sleeved on the outside of the fixed rod 20, so that the movable rod 30 can move up and down relative to the fixed rod 20, forming an installation gap between the movable rod 30 and the fixed rod 20. The limiting member is embedded from the top of the installation gap, so that the locking part of the limiting member is placed in the installation gap. The limiting part on the fixed rod 20 is set on the outer surface of the fixed rod 20 and located inside the installation gap. Thus, inside the installation gap, the locking part of the limiting member can move between a first position that engages with the locking part on the limiting part and a second position that is separated from the locking part.

[0048] The seat of this utility model includes the aforementioned adjustable armrest assembly. The other structures of the seat are the same as those in the prior art and will not be described in detail here.

[0049] Finally, it should be noted that the above embodiments are only optional embodiments of this utility model and should not be used to limit the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. An adjustable armrest assembly, characterized in that, Includes a handle, a fixed rod, a movable rod, at least two limiting components, and at least two elastic components; The movable rod can move up and down relative to the fixed rod, and the handle is connected to the movable rod; the fixed rod is provided with at least two limiting parts, each limiting part including multiple locking parts arranged vertically, and any two locking parts in all the limiting parts are staggered in the vertical direction. Each limiting member corresponds to a limiting part. The limiting member includes a connecting part and a locking part that cooperates with the locking part. The connecting part is movably connected to the handle or movable rod so that the locking part can move between a first position engaged with the locking part and a second position separated from the locking part. Each elastic member corresponds to a limiting member. The elastic member is used to apply elastic stress to the corresponding limiting member so that the locking part always tends to move towards the first position. When the locking part of one of the limiting members is in the first position, the locking parts of the other limiting members are limited to the second position by the fixing rod.

2. The adjustable handrail assembly of claim 1, wherein, All the locking parts of the limiting parts are at the same height. The part of the fixed rod between two adjacent locking parts of the same limiting part forms a stop. In the two adjacent limiting parts, the locking part of one limiting part is set at the same height as the stop part of the other limiting part.

3. The adjustable handrail assembly of claim 1, wherein, The fixing rod is a hollow structure with an open top. The limiting member is a rod extending vertically. It is inserted into the fixing rod through the top opening of the fixing rod so that the locking part is located inside the fixing rod. The connecting part is located at the top of the limiting member and is pivotally connected to the movable rod or handle. The locking part is a boss that bends from the bottom of the limiting member toward the inner wall of the fixing rod. The locking part is a slot that extends outward from the inner wall of the fixing rod.

4. The adjustable handrail assembly of claim 3, wherein, The top of the movable rod is provided with a pivot, and the connecting parts of at least two limiting members are pivotally connected to the pivot. A support wall is provided on the side of the limiting member away from the boss. One end of the elastic member abuts against the support wall and the other end abuts against the handle or movable rod to apply downward elastic stress to the support wall.

5. The adjustable handrail assembly of claim 4, wherein, The support walls on all the limiting components are at the same height, and a push switch that can move up and down relative to the movable rod is installed on the movable rod. The push switch is located below the support walls of all the limiting components.

6. The adjustable handrail assembly of claim 4, wherein, The top of the inner surface of the movable rod has two mounting slots with top openings. The two mounting slots are positioned opposite each other. The two ends of the rotating shaft are respectively embedded into the two mounting slots from top to bottom. The bottom of the handle is provided with a pressure cap. The pressure cap is detachably fixed to the top of the movable rod and seals the two ends of the rotating shaft into the two mounting slots respectively.

7. The adjustable handrail assembly of claim 6, wherein, The upper surface of the support wall is provided with an upwardly protruding limiting post, the lower surface of the pressure cap is provided with a limiting groove, and the elastic element is a spring, the lower end of which is sleeved on the limiting post and the upper end is embedded in the limiting groove.

8. The adjustable handrail assembly of claim 3, wherein, The fixed rod includes two opposing first sidewalls and two opposing second sidewalls. The width of the two first sidewalls is greater than the width of the two second sidewalls so that the cross-section of the fixed rod forms a non-rotating body. The movable rod is sleeved on the outside of the fixed rod so that the movable rod can slide relative to the fixed rod in the vertical direction. All limiting parts are provided on the same first sidewall of the fixed rod.

9. The adjustable handrail assembly of claim 1, wherein, The movable rod is sleeved on the outside of the fixed rod so that the movable rod can slide relative to the fixed rod in the vertical direction. An installation gap is formed between the movable rod and the fixed rod. The limiting member is inserted from the top of the installation gap so that the snap-fit ​​part of the limiting member is placed in the installation gap. The limiting part is set on the outer surface of the fixed rod and located in the installation gap.

10. A seat, characterized by Includes the adjustable armrest assembly as described in any one of claims 1-9.

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