A seat and an armrest thereof

Abstract

The utility model discloses a kind of seat and its handrails, comprising: handrail part, including handrail surface, limiting piece, sliding part and base;Swing arm;Supporting part;Outer shell.This scheme is realized between the front and rear adjustment and rotation adjustment of handrail part and swing arm by the cooperation of limiting piece, sliding part, base and mounting seat, handrail part and supporting part can be rotatably connected, supporting part can be adjusted by lifting by lifting adjustment structure, to realize the multidirectional, large-scale adjustment of handrail, and, limiting piece, sliding part and base are cooperated by gear slot, convex part etc between three, reduce the spare part for assembly, it is convenient to assemble, and simple structure, high reliability.

Description

Technical Field

[0001] This utility model relates to the field of seating, and in particular to a seating and its armrests. Background Technology

[0002] Chairs are a common piece of everyday furniture on the market. Existing chairs typically have functions such as seat rotation, seat height adjustment, and backrest angle adjustment. Many office workers or students spend most of their day sitting in chairs, and usually use their lunch break to recline and rest in the chair.

[0003] Many chair armrests on the market can only be adjusted in one way: height, forward / backward, or left / right. For example, patent application CN220403552U discloses a height-adjustable armrest that uses a control component to engage a beveled latch and a beveled groove, allowing the armrest to be adjusted up and down. Users can directly pull up or move the handle to adjust the height. However, in this solution, people of different body shapes cannot adjust the forward / backward or left / right position of the chair armrest according to their own needs. The adjustment range is small, and the function of the armrest is relatively limited. In addition, the armrest has many parts, making assembly cumbersome and reducing production efficiency. Utility Model Content

[0004] In order to solve the above-mentioned technical problems, the purpose of this utility model is to provide a simple and easy-to-assemble seat and its armrests, which can realize the forward and backward movement, left and right rotation and up and down movement of the armrests, with a large adjustment range.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A handrail, comprising:

[0007] The armrest includes an armrest surface, a limiting member, a sliding member, and a base. The base has a sliding groove with multiple consecutive front and rear position slots on its left and / or right side walls. A first limiting opening is formed on the bottom surface of the sliding groove. The sliding member is positioned within the sliding groove in a manner that allows it to move back and forth but not rotate. The sliding member has a first protrusion that can engage with the front and rear position slots. The first protrusion is a thin-walled elastic element. The sliding member has a first rotating groove with multiple consecutive first rotating position slots on its front and / or rear side walls. A second limiting opening is formed on the bottom surface of the first rotating groove. The limiting member is positioned within the first rotating groove in a manner that allows it to rotate but not move back and forth. The limiting member has a second protrusion that can engage with the first rotating position slot. The armrest surface is fixedly mounted above the base.

[0008] The rotating arm has a mounting base fixedly provided at its front end. The mounting base passes through the first limiting port and the second limiting port in sequence and is connected to the limiting member in a non-rotatable manner. The mounting base can move back and forth along the first limiting port.

[0009] The support section has its upper end rotatably connected to the rear end of the rotating arm;

[0010] The outer shell, which is adjustable in height and fits over the support section via a lifting and adjusting structure.

[0011] Preferably, the left and right sides of the slide are provided with multiple continuous front and rear position slots, and the left and right sides of the sliding member are provided with a first protrusion that can be inserted into the front and rear position slots; the first protrusion is arc-shaped, the front and rear ends of the first protrusion are connected to the sliding member, and a first opening is provided between the first protrusion and the sliding member.

[0012] Preferably, one of the front and rear side walls of the first rotating groove is provided with multiple continuous first rotating gear slots, and the other side wall is an arc-shaped side wall. One end of the limiting member is integrally provided with a second protrusion that can be inserted into the first rotating gear slot, and the other end of the limiting member is arc-shaped. The width of the limiting member is equivalent to the width of the first rotating groove.

[0013] Preferably, the sidewall of the first rotating slot where the first rotating gear slot is located is thin-walled. The left and right ends of the sidewall of the first rotating slot are connected to the sliding member. There is a third opening between the sidewall of the first rotating slot and the bottom surface of the first rotating slot, and there is a fourth opening between the sidewall of the first rotating slot and the sliding member. The fourth opening is provided with a plurality of connecting ribs for connecting the sidewall of the first rotating slot and the sliding member.

[0014] Preferably, a limiting block is protruding from the upper surface of the mounting base, and a limiting groove corresponding to the limiting block is provided on the lower surface of the limiting member. The limiting block of the mounting base passes through the first limiting opening and the second limiting opening in sequence and then gets into the limiting groove of the limiting member. The width of the limiting block of the mounting base is equivalent to the width of the first limiting opening.

[0015] Preferably, a stop block is protruding on the front and rear sidewalls of the slide; a third protrusion is integrally provided at the front and rear ends of the sliding member, the third protrusion being a thin-walled elastic member, the left and right ends of the third protrusion being connected to the sliding member, and a second opening being provided between the third protrusion and the sliding member.

[0016] Preferably, the lifting adjustment structure includes a lifting gear slot, a rotating rod, and an elastic element arranged longitudinally on the outer shell. The rotating rod is disposed inside the support part, with the upper part of the rotating rod extending out of the support part, the middle part of the rotating rod rotatably connected to the support part, and the lower part of the rotating rod extending out of the support part and being able to be engaged in the lifting gear slot. The elastic element is disposed between the upper end of the rotating rod and the support part, and the elastic element is used to reset the rotating rod.

[0017] Preferably, the support includes a support housing and a rotating seat. The rotating seat is fixedly installed above the support housing and covers the upper opening of the support housing. The lower surface of the rotating seat is provided with a first receiving groove. The upper end of the rotating rod is provided with a mounting seat. One end of the elastic element is sleeved on the mounting seat of the rotating rod, and the other end of the elastic element is disposed in the first receiving groove of the rotating seat.

[0018] Preferably, the support part further includes a limiting seat, which is fixedly installed on the rotating seat. The lower part of the limiting seat is provided with at least one locking block. The other end of the rotating arm has a rotating hole, and a limiting surface is provided in the rotating hole. A second rotating groove adapted to the locking block is provided on the limiting surface. The locking block of the limiting seat is set in the second rotating groove and can rotate along the second rotating groove, so that the rotating arm and the support part can be rotatably connected.

[0019] The support also includes a rotating ring disposed between the rotating seat and the rotating arm. The rotating ring is fixed to the rotating arm and has multiple consecutive second rotation positions on its lower surface. The rotating seat has at least one limiting protrusion that can be inserted into the second rotation position groove.

[0020] A seating arrangement includes a backrest and an armrest as described above, wherein the sides of the backrest are fitted over an outer shell and snapped into and fixed to the outer shell.

[0021] This utility model, by adopting the above technical solution, has the following beneficial effects: 1. This solution achieves front-to-back and rotational adjustment between the handrail and the rotating arm through the cooperation of the limiting component, the sliding component, the base, and the mounting seat. The handrail and the support are rotatably connected, and the support can be adjusted in height through the lifting adjustment structure, thereby realizing multi-directional and wide-range adjustment of the handrail; 2. In this solution, the limiting component, the sliding component, and the base cooperate through the stop groove, the protrusion, etc., which reduces the parts used for assembly, facilitates assembly, and has a simple structure and high reliability. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation thereof.

[0023] Figure 1 This is a schematic diagram of the armrest installation structure on the seating.

[0024] Figure 2 This is a schematic diagram of the handrail structure in this utility model;

[0025] Figure 3 for Figure 2 Another structural diagram from another angle;

[0026] Figure 4 Exploded view of the handrail and swivel arm;

[0027] Figure 5 This is a structural schematic diagram of the limiting component;

[0028] Figure 6 This is a schematic diagram of the sliding component;

[0029] Figure 7 This is a schematic diagram of the base structure;

[0030] Figure 8 This is a structural diagram of the handrail.

[0031] Figure 9 This is an exploded view of part of the handrail in this utility model;

[0032] Figure 10 This is a schematic diagram of the limiting seat.

[0033] Figure 11 This is a schematic diagram of the structure supporting the shell.

[0034] Figure label:

[0035] 1. Handrail section; 11. Handrail surface; 12. Limiting component; 121. Second protrusion; 122. Limiting groove; 13. Sliding component; 131. First protrusion; 1311. First opening; 132. First rotation groove; 1321. First rotation position groove; 1322. Second limiting opening; 1323. Third opening; 133. Third protrusion; 1331. Second opening; 134. Connecting rib; 135. Fourth opening; 14. Base; 141. Slide groove; 1411. Front and rear position grooves; 1412. First limiting opening; 1413. Stop;

[0036] 2. Rotary arm; 21. Mounting base; 211. Limiting block; 221. Rotary hole; 2211. Limiting surface; 2212. Second rotating groove;

[0037] 3. Support part; 31. First opening; 32. Second opening; 33. Limiting protrusion; 301. Support housing; 302. Rotating seat; 321. First receiving groove; 322. Limiting protrusion; 323. Limiting protrusion mounting port; 324. Limiting groove; 303. Rotating ring; 331. Second rotation stop groove; 304. Limiting seat; 341. First connecting part; 3411. Locking block; 342. Second connecting part; 3421. Positioning block; 305. Cover plate;

[0038] 4. Outer shell; 41. First shell; 411. Lifting gear slot; 42. Second shell; 421. Third limiting port;

[0039] 5. Rotating rod; 54. Mounting base;

[0040] 6. Elastic components;

[0041] 7. Chair back. Detailed Implementation

[0042] The embodiments of this utility model are described in detail below. Examples of these 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 intended to explain this utility model, and should not be construed as limiting this utility model.

[0043] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0044] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0045] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0046] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0047] For clarity, in this invention, when a user uses the seat, the direction their face faces is forward, and vice versa.

[0048] like Figures 2 to 11 As shown, this utility model discloses a handrail, including: a handrail part 1, including a handrail surface 11, a limiting member 12, a sliding member 13, and a base 14, wherein the base 14 is provided with a sliding groove 141, and the left side wall and / or right side wall of the sliding groove 141 are provided with a plurality of continuous front and rear stop grooves 1411, and the bottom surface of the sliding groove 141 has a first limiting opening 1412; the sliding member 13 is disposed in the sliding groove 141 in a manner that allows it to move back and forth but not rotate, and the sliding member 13 is provided with a first protrusion 131 that can be engaged with the front and rear stop grooves 1411, the first protrusion 131 being a thin-walled elastic member, and the sliding member 13 is provided with a first rotating groove 132, and the front side wall and / or rear side wall of the first rotating groove 132 are provided with a plurality of continuous first rotating stop grooves. 1321, the bottom surface of the first rotating groove 132 has a second limiting opening 1322; the limiting member 12 is set in the first rotating groove 132 in a rotatable but non-movable manner, and the limiting member 12 has a second protrusion 121 that can be inserted into the first rotating position groove 1321; the armrest surface 11 is fixedly installed above the base 14; the rotating arm 2 has a mounting seat 21 fixedly installed at its front end, and the mounting seat 21 passes through the first limiting opening 1412 and the second limiting opening 1322 in sequence and is connected to the limiting member 12 in a non-rotatable manner, and the mounting seat 21 can move back and forth along the first limiting opening 1412; the support part 3 has its upper end rotatably connected to the rear end of the rotating arm 2; the outer shell 4 is fitted on the support part 3 in a height-adjustable manner through a lifting adjustment structure.

[0049] In this way, the armrest 1 and the rotating arm 2 can be adjusted forward and backward and rotated through the cooperation of the limiting member 12, the sliding member 13, the base 14 and the mounting base 21. The armrest 1 and the support 2 are rotatably connected, and the support 2 can be adjusted up and down on the backrest 7 through the lifting adjustment structure, thereby realizing multi-directional and wide-range adjustment of the armrest. Moreover, in this solution, the limiting member 12, the sliding member 13 and the base 14 are connected by the stop groove, the protrusion and other parts, which reduces the number of parts used for assembly, makes assembly simple, the overall structure is simple, the reliability is high and the production cost is low.

[0050] like Figure 6 As shown, the front and rear gear slots 1411 can be provided only on the left or right side wall of the slide groove 141. In order to prevent the slider 13 from getting stuck when sliding back and forth and to distribute the force more evenly, in this solution, multiple continuous front and rear gear slots 1411 are provided on the left and right side walls of the slide groove 141. The left and right side walls of the slider 13 are provided with a first protrusion 131 that can be inserted into the front and rear gear slots 1411. The first protrusion 131 is arc-shaped, and both ends of the first protrusion 131 are connected to the slider 13. Specifically, the first protrusion 131 and the slider 13 are integrally formed, and a first opening 1311 is provided between the first protrusion 131 and the slider 13. By setting the first protrusion 131 as a thin-walled elastic element and providing a first through 1311 between the first protrusion 131 and the sliding member 13, the first protrusion 131 has a certain elasticity. When the sliding member 13 slides back and forth relative to the slide groove 141, the first protrusion 131 of the sliding member 13 undergoes elastic deformation and then gets stuck in the adjacent front and rear stop grooves 1411, and the first protrusion 131 is reset.

[0051] To indicate and limit the travel distance of the slider 13, such as Figure 6 , Figure 7 and Figure 8 As shown, a stop block 1413 is protruding from the front and rear side walls of the slide groove 141, respectively; a third protrusion 133 is integrally formed at the front and rear ends of the sliding member 13. The third protrusion 133 is a thin-walled elastic member, and its left and right ends are connected to the sliding member 13. Specifically, the third protrusion 133 and the sliding member 13 are integrally formed, and a second through-hole 1331 is provided between the third protrusion 133 and the sliding member 13. In this way, when the sliding member 13 moves to the end of its stroke, the third protrusion 133 of the sliding member 13 contacts the stop block 1413 of the slide groove, and the third protrusion 133 undergoes appropriate elastic deformation, which can also prevent damage to the sliding member 13.

[0052] In this design, one of the front and rear side walls of the first rotating groove 132 is provided with multiple continuous first rotating stop grooves 1321, and the other side wall is an arc-shaped side wall. One end of the limiting member 12 is integrally provided with a second protrusion 121 that can be inserted into the first rotating stop groove 1321, and the other end of the limiting member 12 is arc-shaped. The width of the limiting member 12 is approximately equal to the width of the first rotating groove 132. Furthermore, by setting the other side wall of the first rotating groove 132 as an arc-shaped side wall, it is ensured that the limiting member 12 can only rotate within the first rotating groove 132 and cannot move. Figure 6 As shown, the sidewall of the first rotating groove 132, where the first rotating gear slot 1321 is located, is thin-walled. The left and right ends of the sidewall of the first rotating groove 132 are connected to the sliding member 13. There is a third opening 1323 between the sidewall of the first rotating groove 132 and the bottom surface of the first rotating groove 132, and there is a fourth opening 135 between the sidewall of the first rotating groove 132 and the sliding member 13. In this way, while reducing the weight of the sliding member 13, the elasticity of the sidewall of the first rotating groove 132 with the first rotating gear slot 1321 is also increased. When the limiting member 12 rotates left and right relative to the first rotating groove 132, the sidewall of the first rotating groove 132 with the first rotating gear slot 1321 undergoes elastic deformation, thereby allowing the second protrusion 121 of the limiting member 12 to switch between the first rotating gear slots 1321. In order to increase the strength of the sidewall of the first rotating groove 132, the fourth opening 135 is provided with a plurality of connecting ribs 134 for connecting the sidewall of the first rotating groove 132 and the sliding member 13.

[0053] In this plan, such as Figure 4 and Figure 5 As shown, a limiting block 211 is integrally protruded on the upper surface of the mounting base 21, and a limiting groove 122 corresponding to the limiting block 211 is provided on the lower surface of the limiting member 12. The limiting block 211 of the mounting base 21 passes through the first limiting port 1412 and the second limiting port 1322 in sequence and is then inserted into the limiting groove 121 of the limiting member 12. The width of the limiting block 211 of the mounting base 21 is equivalent to the width of the first limiting port 1412, which can prevent the armrest 1 from swaying left and right when it is installed on the rotating arm 2.

[0054] In this utility model, such as Figure 9As shown, the lifting and adjusting structure includes a lifting gear slot 411 arranged longitudinally on the outer shell 4, a rotating rod 5, and an elastic element 6. The rotating rod 5 is located inside the support part 3, with its upper part extending out of the support part 3, its middle part rotatably connected to the support part 3, and its lower part extending out of the support part 3 and engaging with the lifting gear slot 411. The elastic element 6 is located between the upper end of the rotating rod 5 and the support part 3, and is used to reset the rotating rod 5. The rotating rod 5 is equivalent to a lever structure. By pressing the upper part of the rotating rod 5, the rotating rod 5 rotates around its middle part, causing the lower part of the rotating rod 5 to disengage from the lifting gear slot 411. At this time, the elastic element 6 deforms. Subsequently, moving the support part 3 up and down allows the rotating arm 2 and the handrail 1 to move up and down. When the handrail 1 is adjusted to the appropriate position, releasing the upper part of the rotating rod 5 resets the rotating rod 5 under the action of the elastic element 6, and the lower part of the rotating rod 5 re-engages with the lifting gear slot 411, thus completing the lifting and adjusting of the handrail.

[0055] The outer shell 4 is formed by the snap-fit ​​connection of a first shell 41 and a second shell 42. The lifting gear groove 411 is formed on the first shell 41. A third limiting opening 421 is formed on the second shell 42. A limiting protrusion 33 is formed on the support part 3. The limiting protrusion 33 is set to snap into the third limiting opening 421 and can move up and down along the third limiting opening 421. This makes it more convenient to assemble the outer shell 4 on the support part 3. Moreover, by setting the third limiting opening 421 on the second shell 42 and setting the limiting protrusion 33 on the support part 3, the up and down movement of the support part 3 is limited, preventing the support part 3 from coming out of the outer shell 4.

[0056] In this design, the support portion 3 includes a support housing 301 and a rotating seat 302. The rotating seat 302 is fixedly installed above the support housing 301 and covers the upper opening of the support housing 301. The lower surface of the rotating seat 302 is provided with a first receiving groove 321. The upper end of the rotating rod 5 is provided with a mounting seat 54. One end of the elastic element 6 is sleeved on the mounting seat 54 of the rotating rod 5, and the other end of the elastic element 6 is disposed in the first receiving groove 321 of the rotating seat 302. Generally, the elastic element 6 is a spring, and the rotating seat 302 can be fixedly installed on the support housing 301 by fasteners.

[0057] like Figure 9 and Figure 10As shown, the support part 3 also includes a limiting seat 304, which is fixedly installed on the rotating seat 302. The lower part of the limiting seat 304 is provided with at least one locking block 3411. The other end of the rotating arm 2 has a rotating hole 221, and a limiting surface 2211 is provided in the rotating hole 221. A second rotating groove 2212 adapted to the locking block 3411 is provided on the limiting surface 2211. The locking block 3411 of the limiting seat 304 is disposed in the second rotating groove 2212 and can rotate along the second rotating groove 2212, so that the rotating arm 2 and the support part 3 can be rotatably connected. The length of the second rotating groove 2212 is less than the length of the locking block 3411, thereby limiting the rotation angle of the rotating arm 2.

[0058] The support part 3 also includes a rotating ring 303 disposed between the rotating seat 302 and the rotating arm 2. The rotating ring 303 is fixedly positioned to the rotating arm 2. The lower surface of the rotating ring 303 is provided with multiple consecutive second rotation positions 331. The rotating seat 302 is provided with at least one limiting protrusion 322 that can be engaged with the second rotation position slot 331. When the rotating arm 2 rotates, the rotating ring 303 rotates simultaneously, and the limiting protrusion 322 of the rotating seat 302 switches between different second rotation positions 331. A clicking sound is heard during rotation, and the rotation feels good. The limiting protrusion 322 can be integrally formed and protruded on the rotating seat 302, or it can be a separate component. In the latter case, a limiting protrusion mounting port 323 is opened on the rotating seat 302 for mounting the limiting protrusion 322.

[0059] The support part 3 also includes a cover plate 305, which is fixedly installed in the rotating hole 221 of the rotating arm 2 and can cover the rotating hole 221. In this utility model, the cover plate 305 is fastened in the rotating hole 221 of the rotating arm 2 by a snap fastener.

[0060] This utility model also discloses a seat, including a backrest and an armrest as described above, such as... Figure 1 As shown, the side of the chair back 7 is fitted over the outer shell 3 and is snapped and fixed to the outer shell 3.

[0061] All features described in the specification, appended claims and drawings, whether individually or in any combination thereof, are essential features of this utility model.

[0062] The technical solutions described in this utility model also include any one or more specific features, structures, materials or characteristics described above, formed individually or in combination.

[0063] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, alterations, deletions of some features, additions of features, or recombinations of features to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the innovative principles of the present invention shall still fall within the scope of the technical solutions of the present invention.

Claims

1. A handrail, characterized in that include: The armrest (1) includes an armrest surface (11), a limiting member (12), a sliding member (13), and a base (14). The base (14) has a sliding groove (141) inside. Multiple consecutive front and rear position grooves (1411) are provided on the left and / or right sides of the sliding groove (141). A first limiting opening (1412) is opened on the bottom surface of the sliding groove (141). The sliding member (13) is disposed within the sliding groove (141) in a manner that allows it to move back and forth but not rotate. The sliding member (13) has a first protrusion (131) that can be engaged with the front and rear position grooves (1411). (131) is a thin-walled elastic element. The sliding element (13) is provided with a first rotating groove (132). The front side wall and / or rear side wall of the first rotating groove (132) are provided with a plurality of continuous first rotating position grooves (1321). The bottom surface of the first rotating groove (132) is provided with a second limiting opening (1322). The limiting element (12) is set in the first rotating groove (132) in a rotatable but non-movable manner. The limiting element (12) is provided with a second protrusion (121) that can be inserted into the first rotating position groove (1321). The armrest surface (11) is fixedly installed above the base (14). The rotating arm (2) has a mounting base (21) fixedly provided at its front end. The mounting base (21) passes through the first limiting port (1412) and the second limiting port (1322) in sequence and is connected to the limiting member (12) in a non-rotatable manner. The mounting base (21) can move back and forth along the first limiting port (1412). The upper end of the support part (3) is rotatably connected to the rear end of the rotating arm (2); The outer shell (4) is fitted outside the support part (3) through a lifting and adjusting structure.

2. A handrail according to claim 1, characterised in that The left and right sides of the slide groove (141) are provided with a plurality of continuous front and rear position grooves (1411). The left and right sides of the sliding member (13) are provided with a first protrusion (131) that can be inserted into the front and rear position grooves (1411). The first protrusion (131) is arc-shaped. The front and rear ends of the first protrusion (131) are connected to the sliding member (13). A first opening (1311) is provided between the first protrusion (131) and the sliding member (13).

3. A handrail according to claim 1, wherein The first rotating groove (132) has a plurality of continuous first rotating gear grooves (1321) on one of the front and rear side walls, and the other side wall is an arc-shaped side wall. One end of the limiting member (12) is integrally provided with a second protrusion (121) that can be inserted into the first rotating gear groove (1321), and the other end of the limiting member (12) is arc-shaped. The width of the limiting member (12) is equivalent to the width of the first rotating groove (132).

4. A handrail according to claim 3, wherein The side wall of the first rotating groove (132) where the first rotating gear groove (1321) is located is thin-walled. The left and right ends of the side wall of the first rotating groove (132) are connected to the sliding member (13). There is a third opening (1323) between the side wall of the first rotating groove (132) and the bottom surface of the first rotating groove (132). There is a fourth opening (135) between the side wall of the first rotating groove (132) and the sliding member (13). The fourth opening (135) is provided with a plurality of connecting ribs (134) for connecting the side wall of the first rotating groove (132) and the sliding member (13).

5. A handrail according to claim 1, wherein The upper surface of the mounting base (21) is provided with a limiting block (211), and the lower surface of the limiting member (12) is provided with a limiting groove (122) corresponding to the limiting block (211). The limiting block (211) of the mounting base (21) passes through the first limiting port (1412) and the second limiting port (1322) in sequence and then gets stuck in the limiting groove (121) of the limiting member (12). The width of the limiting block (211) of the mounting base (21) is equivalent to the width of the first limiting port (1412).

6. A handrail according to claim 1, wherein A stop block (1413) is protruding on the front and rear side walls of the slide groove (141); a third protrusion (133) is provided at the front and rear ends of the sliding member (13), the third protrusion (133) is a thin-walled elastic member, the left and right ends of the third protrusion (133) are connected to the sliding member (13), and a second opening (1331) is provided between the third protrusion (133) and the sliding member (13).

7. A handrail according to claim 1, wherein The lifting adjustment structure includes a lifting gear slot (411), a rotating rod (5), and an elastic element (6) arranged longitudinally on the outer shell (4). The rotating rod (5) is located inside the support part (3). The upper part of the rotating rod (5) extends out of the support part (3), the middle part of the rotating rod (5) is rotatably connected to the support part (3), and the lower part of the rotating rod (5) can be inserted into the lifting gear slot (411) after extending out of the support part (3). The elastic element (6) is located between the upper end of the rotating rod (5) and the support part (3). The elastic element (6) is used to reset the rotating rod (5).

8. A handrail according to claim 7, characterised in that The support part (3) includes a support housing (301) and a rotating seat (302). The rotating seat (302) is fixedly installed above the support housing (301) and covers the upper opening of the support housing (301). The lower surface of the rotating seat (302) is provided with a first receiving groove (321). The upper end of the rotating rod (5) is provided with a mounting seat (54). One end of the elastic member (6) is sleeved on the mounting seat (54) of the rotating rod (5), and the other end of the elastic member (6) is set in the first receiving groove (321) of the rotating seat (302).

9. A handrail according to claim 8, characterised in that The support part (3) also includes a limiting seat (304), which is fixedly installed on the rotating seat (302). The lower part of the limiting seat (304) is provided with at least one locking block (3411). The other end of the rotating arm (2) is provided with a rotating hole (221), and a limiting surface (2211) is provided in the rotating hole (221). A second rotating groove (2212) adapted to the locking block (3411) is provided on the limiting surface (2211). The locking block (3411) of the limiting seat (304) is set in the second rotating groove (2212) and can rotate along the second rotating groove (2212), so that the rotating arm (2) and the support part (3) can be rotatably connected. The support part (3) also includes a rotating ring (303) disposed between the rotating seat (302) and the rotating arm (2). The rotating ring (303) is fixed to the rotating arm (2). The lower surface of the rotating ring (303) is provided with a plurality of continuous second rotation positions (331). The rotating seat (302) is provided with at least one limiting protrusion (322) that can be inserted into the second rotation position groove (331).

10. A seat furniture, characterized in that Includes a chair back (7) and an armrest as described in any one of claims 1-9, wherein the side of the chair back (7) is fitted over the outer shell (3) and snapped into place.

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