Chair armrest

Abstract

The utility model relates to the technical field of armrests, in particular to a chair armrest which comprises a supporting piece and an armrest plate, and the armrest plate comprises a rotating piece rotationally connected with the supporting piece and an adjusting piece movably connected with the rotating piece in the first moving direction. A cantilever type elastic piece type angle control mechanism for controlling the rotating angle of the rotating piece is arranged between the supporting piece and the rotating piece, at least part of the cantilever type elastic piece type angle control mechanism is arranged on the supporting piece, and the rest part of the cantilever type elastic piece type angle control mechanism is arranged on the rotating piece. A cantilever type elastic piece position control mechanism arranged in the first moving direction is arranged between the rotating piece and the adjusting piece, at least part of the cantilever type elastic piece position control mechanism is arranged on the rotating piece, and the remaining part of the cantilever type elastic piece position control mechanism is arranged on the adjusting piece. The rotating angle of the rotating piece and the position of the adjusting piece are accurately controlled through the cantilever type elastic piece type angle control mechanism and the cantilever type elastic piece type position control mechanism, and fine positioning of the armrest plate is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to handrail technical field, specifically, relate to a chair armrest. BACKGROUND

[0002] The main function of a chair is to provide sitting support, and the armrest further enhances this function. The main function of the armrest is to provide arm support and reduce fatigue caused by long-term sitting.

[0003] In traditional chair design, the distance and angle between armrests are usually fixed and cannot be adjusted according to the different needs of users. Different body types of users have different needs for the position and comfort of the armrest. This difference makes it difficult for armrests with fixed distances to meet the needs of all people. SUMMARY

[0004] In view of this, the utility model relates to a chair armrest, which aims to solve the above technical problems.

[0005] The utility model relates to a chair armrest, which comprises a support member and an armrest plate. The armrest plate comprises a rotating member rotatably connected to the support member, and an adjusting member movably connected to the rotating member in a first movement direction. A cantilever spring sheet type angle control mechanism is provided between the support member and the rotating member to control the rotation angle of the rotating member. At least part of the cantilever spring sheet type angle control mechanism is provided on the support member, and the remaining part of the cantilever spring sheet type angle control mechanism is provided on the rotating member. A cantilever spring sheet type position control mechanism is provided between the rotating member and the adjusting member along the first movement direction. At least part of the cantilever spring sheet type position control mechanism is provided on the rotating member, and the remaining part is provided on the adjusting member.

[0006] In some embodiments of the present application, the cantilever spring sheet type angle control mechanism comprises at least one cantilever spring sheet and a plurality of cantilever spring sheet locking grooves. One of the cantilever spring sheet and the cantilever spring sheet locking groove is provided on the rotating member, and the other is provided on the support member. The free end of each cantilever spring sheet is provided with a locking portion that can be locked in any one of the locking grooves.

[0007] In some embodiments of the present application, the cantilever spring sheet is inclined from top to bottom.

[0008] In some embodiments of the present application, a fixing member is provided on the top side of the support member. The rotating member is rotatably connected to the fixing member. The end of the cantilever spring sheet away from the locking portion is connected to the fixing member.

[0009] In some embodiments of the present application, the cantilever spring is in two pieces, and the two pieces of the cantilever spring are symmetrically distributed with respect to the rotation center of the rotating member and the fixed member, and two pressure relief avoiding holes for accommodating the cantilever spring are further provided on the fixed member, and one end of the cantilever spring away from the locking portion is connected to the hole wall of the pressure relief avoiding hole.

[0010] In some embodiments of the present application, a strip-shaped hole for the fixed member to pass through is provided on the adjusting member.

[0011] In some embodiments of the present application, the cantilever spring position control mechanism comprises at least one cantilever spring two and a plurality of locking grooves two, one of the cantilever spring two and the locking groove two is provided on the adjusting member, and the other is provided on the rotating member, and a locking protrusion is provided on the cantilever end of the cantilever spring two.

[0012] In some embodiments of the present application, two rows of the locking grooves two are provided on the adjusting member, and each row of the locking grooves two is matched with one of the cantilever springs two.

[0013] In some embodiments of the present application, the armrest further comprises an armrest supporting member, a cyclic angle control mechanism for adjusting the inclination angle of the supporting member is provided between the supporting member and the armrest supporting member, the cyclic angle control mechanism comprises a rotating member located in the armrest supporting member and having a plurality of ratchet grooves, the rotating member is axially fixedly connected with a connecting shaft fixedly arranged in the circumferential direction of the supporting member, a concave-convex limiting structure limiting the position of the rotating member in a first rotation direction and a second rotation direction is provided between the armrest supporting member and the rotating member, an elastic member enabling a pawl to engage with any one of the ratchet grooves is provided in the armrest supporting member, and an unlocking position is further provided in the armrest supporting member, and a pawl control structure is further provided between the rotating member and the pawl.

[0014] When the rotating member is rotated to a position in the first rotation direction, the pawl control structure enables the pawl to disengage from the ratchet groove and at least part of the pawl to enter the unlocking position.

[0015] When the rotating member is rotated to a position in the second rotation direction, the pawl control structure enables the pawl to disengage from the unlocking position and re-engage with the ratchet groove.

[0016] In some embodiments of the present application, the convex limit structure includes a limit boss arranged on the rotating member, and an arc-shaped limit track groove is arranged on the handrail support member, and the limit boss is located in the arc-shaped limit track groove; the pawl control structure includes a pawl pushing boss arranged on the pawl, and an arc-shaped track groove is arranged on the rotating member, and the pawl pushing boss is located in the arc-shaped track groove.

[0017] Compared with the prior art, the beneficial effects of the present application are that the rotating member is rotatably connected with the support member, drives the whole handrail plate to adjust the angle on the support member, and moves relative to the adjusting member in the first moving direction, allows the position of the handrail plate to be finely adjusted in a specific direction, and realizes the double adjustment function of the handrail plate in angle and position. Further, the cantilever spring sheet type angle control mechanism utilizes the elastic property of the cantilever spring sheet to accurately control the rotation angle of the rotating member, prevents safety hazards or function failure caused by excessive rotation. The cantilever spring sheet type position control mechanism utilizes the mechanical property of the cantilever spring sheet to ensure the position of the adjusting member in the first moving direction to be accurate, thereby realizing fine positioning of the handrail plate. BRIEF DESCRIPTION OF DRAWINGS

[0018] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of preferred embodiments, and are not meant to limit the present application. Moreover, the same reference numerals in the attached drawings refer to the same or similar components throughout the several drawings. In the drawings:

[0019] Figure 1 A three-dimensional structural schematic view of a chair handrail provided by an embodiment of the present application;

[0020] Figure 2 A side view of a chair handrail provided by an embodiment of the present application;

[0021] Figure 3 A sectional view of a chair handrail provided by an embodiment of the present application;

[0022] Figure 4 A three-dimensional structural schematic view of an adjusting member and a rotating member provided by an embodiment of the present application;

[0023] Figure 5 A bottom view of an adjusting member and a rotating member provided by an embodiment of the present application;

[0024] Figure 6 A top view of an adjusting member and a rotating member provided by an embodiment of the present application;

[0025] Figure 7 A three-dimensional structural schematic view of a support member provided by an embodiment of the present application;

[0026] Figure 8 The utility model provides Figure 5 The top view of

[0027] Figure 9 The utility model provides the three -dimensional structure schematic diagram of the circulating angle control mechanism for the utility model embodiment provides the three -dimensional structure schematic diagram of the circulating angle control mechanism;

[0028] Figure 10 The utility model provides the front view of the circulating angle control mechanism for the utility model embodiment provides the front view of the circulating angle control mechanism;

[0029] Figure 11 The utility model provides the three -dimensional structure schematic diagram of the rotating part and the pawl for the utility model embodiment provides the three -dimensional structure schematic diagram of the rotating part and the pawl;

[0030] Figure 12 The utility model provides the front view of the rotating part and the pawl for the utility model embodiment provides the front view of the rotating part and the pawl;

[0031] Figure 13 The utility model provides the rear view of the rotating part and the pawl for the utility model embodiment provides the rear view of the rotating part and the pawl;

[0032] Figure 14 The utility model provides the three -dimensional structure schematic diagram of cantilever spring for the utility model embodiment provides the three -dimensional structure schematic diagram of cantilever spring;

[0033] Figure 15 The utility model provides the top view of cantilever spring for the utility model embodiment provides the top view of cantilever spring;

[0034] Figure 16 The utility model provides the bottom view of cantilever spring for the utility model embodiment provides the bottom view of cantilever spring.

[0035] In the drawing: 1, support piece; 11, fixed part; 111, pressure relief avoidance hole; 112, cantilever spring one; 1121, locking part; 2, handrail plate; 21, rotating part; 211, cantilever spring locking groove one; 212, cantilever spring two; 2121, locking protrusion; 22, adjusting part; 221, strip-shaped hole; 222, locking groove two; 3, handrail support part; 31, rotating part; 311, ratchet groove; 312, unlocking position; 313, limit protrusion; 314, arc-shaped trajectory groove; 32, pawl; 321, pawl push protrusion; 33, elastic component; 34, arc-shaped limit trajectory groove. DETAILED DESCRIPTION

[0036] The specific implementation of the utility model is described in further detail below in combination with the drawings and embodiments. The following embodiments are used to illustrate the utility model, but not to limit the scope of the utility model.

[0037] In the description of the application, it needs to be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0038] The terms "first", "second", are only for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0039] In the description of the application, it needs to be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0040] In combination with Figures 1-6 As shown, the chair armrest provided by the embodiment includes a support piece 1, and an armrest plate 2, the armrest plate 2 includes a rotating piece 21 rotatably connected with the support piece 1, and an adjusting piece 22 movably connected with the rotating piece 21 in a first movement direction, the support piece 1 and the rotating piece 21 are provided with a cantilever spring piece type angle control mechanism for controlling the rotation angle of the rotating piece 21, at least part of the cantilever spring piece type angle control mechanism is arranged on the support piece 1, and the remaining part of the cantilever spring piece type angle control mechanism is arranged on the rotating piece 21, the rotating piece 21 and the adjusting piece 22 are provided with a cantilever spring piece type position control mechanism arranged along the first movement direction, at least part of the cantilever spring piece type position control mechanism is arranged on the rotating piece 21, and the remaining part is arranged on the adjusting piece 22.

[0041] It can be understood that the support 1 in this embodiment provides physical support for the chair armrest, and the rotating piece 21 is rotatably connected with the support 1, so that the armrest plate 2 can be flexibly adjusted in angle to adapt to the needs of different users and use scenarios. The adjusting piece 22 is movably connected with the rotating piece 21, so that the armrest plate 2 can be adjusted in position in a specified direction, further improving the comfort and functionality. The cantilever spring sheet type angle control mechanism utilizes the elastic properties of the spring sheet to accurately control the rotation angle of the rotating piece 21, preventing damage or instability caused by excessive rotation. The cantilever spring sheet type position control mechanism also utilizes the properties of the spring sheet to ensure the stability of the adjusting piece 22 in the specified position, avoiding position deviation caused by external force.

[0042] Further, this embodiment realizes the double adjustment of the armrest plate 2 in angle and position through the precise cantilever spring sheet type control mechanism. This not only improves the comfort of the seat, but also enhances the durability and safety.

[0043] In combination with the embodiments shown in Figures 4-8 and Figures 14-16 , in a specific embodiment of the present application, the cantilever spring sheet type angle control mechanism includes at least one cantilever spring sheet 112 and a plurality of cantilever spring sheet locking grooves 211, one of the cantilever spring sheet 112 and the cantilever spring sheet locking groove 211 is arranged on the rotating piece 21, and the remaining one is arranged on the support 1, and the free end of each cantilever spring sheet 112 is respectively provided with a locking portion 1121 clamped in any locking groove 211.

[0044] It can be understood that when the rotating piece 21 rotates relative to the support 1 in this embodiment, the cantilever spring sheet type angle control mechanism utilizes the elastic properties of the cantilever spring sheet 112, and the locking portion 1121 of the cantilever spring sheet 112 will slide in the locking groove. When the rotating piece 21 is adjusted to the desired angle, the locking portion 1121 of the cantilever spring sheet 112 is automatically clamped in any locking groove 211, realizing the angle fixation of the rotating piece 21 relative to the support 1, and further realizing the angle adjustment of the armrest plate 2 relative to the support 1.

[0045] In a specific embodiment of the present application, the cantilever spring sheet 112 is arranged obliquely from top to bottom.

[0046] In a specific embodiment of the present application, a fixing piece 11 is arranged on the top side of the support 1, the rotating piece 21 is rotatably connected with the fixing piece 11, and the end of the cantilever spring sheet 112 away from the locking portion 1121 is connected to the fixing piece 11.

[0047] It can be understood that the rotating member 21 is arranged to rotate on the fixed member 11, and the rotating member 21 drives the handrail plate 2 to rotate relative to the fixed member 11. The end of the cantilever spring 112 away from the locking portion 1121 is connected to the fixed member 11, and the end of the cantilever spring 112 away from the locking portion 1121 to the end provided with the locking portion 1121 is arranged to be inclined from top to bottom, thereby providing a specific elastic force, so that when the rotating member 21 is stationary relative to the fixed member 11, the locking portion 1121 can be clamped in the locking groove I. Further, the connection of the fixed member 11 and the rotating member 21 allows the rotating member 21 to rotate freely within a certain range, while the connection of the cantilever spring 112 ensures that it remains stable during rotation.

[0048] In an embodiment of the present application, the cantilever spring 112 has two pieces, and the two pieces of cantilever spring 112 are symmetrically distributed about the rotation center of the rotating member 21 and the fixed member 11, and two pressure relief avoidance holes 111 are further provided on the fixed member 11 for accommodating the cantilever spring 112, and the end of the cantilever spring 112 away from the locking portion 1121 is connected to the hole wall of the pressure relief avoidance hole 111.

[0049] It can be understood that in the embodiment, the two pieces of cantilever spring 112 are symmetrically distributed about the rotation center of the rotating member 21 and the fixed member 11, which can ensure the balance and stability during rotation. During rotation, when the cantilever spring 112 bends or moves, the pressure relief avoidance hole 111 on the fixed member 11 provides space for accommodating the cantilever spring 112, avoiding interference with other components.

[0050] In combination Figure 5 As shown in the drawings, in an embodiment of the present application, the adjusting member 22 is provided with a strip-shaped hole 221 for the fixed member 11 to pass through.

[0051] It can be understood that in the embodiment, the strip-shaped hole 221 of the adjusting member 22 is arranged to pass through the fixed member 11, and the adjusting member 22 moves relative to the fixed member 11 along the extension direction of the strip-shaped hole 221, thereby realizing the position adjustment function of the chair handrail.

[0052] In combination Figure 4 and Figure 6 As shown in the drawings, in an embodiment of the present application, the cantilever spring position control mechanism includes at least one cantilever spring 212 and a plurality of locking grooves 222, one of the cantilever spring 212 and the locking groove 222 is arranged on the adjusting member 22, and the other is arranged on the rotating member 21, and a locking protrusion 2121 is arranged on the cantilever end of the cantilever spring 212 to be clamped in any one of the locking grooves 222.

[0053] In one specific embodiment of this application, the adjusting member 22 is provided with two rows of locking grooves 222, and each row of locking grooves 222 is paired with a cantilever spring piece 212.

[0054] It is understood that in this embodiment, the rotating component 21 is rotatably mounted on the fixed component 11, meaning that the rotating component 21 can only be adjusted in angle relative to the fixed component 11, not in position. The adjusting component 22 is provided with a slotted hole 221 through which the fixed component 11 passes. When the adjusting component 22 moves relative to the fixed component 11 through the slotted hole 221, the adjusting component 22 also moves relative to the rotating component 21. When the adjusting component 22 is adjusted to the desired position, the locking protrusion 2121 of the cantilever spring plate 212 automatically engages in any locking groove 222, thereby fixing the position of the adjusting component 22 relative to the rotating component 21 and the fixed component 11, ensuring that the adjusting component 22 will not move due to external force. This not only simplifies the structure but also improves the convenience and reliability of operation.

[0055] Combination Figures 1-3 and Figures 9-13 As shown, in a specific embodiment of this application, the chair armrest further includes an armrest support 3. A cyclic angle control mechanism for adjusting the tilt angle of the support 1 is provided between the support 1 and the armrest support 3. The cyclic angle control mechanism includes a rotating member 31 located inside the armrest support 3 and having a plurality of ratchet grooves 311. The rotating member 31 is axially fixed to a connecting shaft that is circumferentially fixed relative to the support 1. A concave-convex limiting structure for limiting the position of the rotating member 31 in a first rotation direction and a second rotation direction is provided between the armrest support 3 and the rotating member 31. An elastic member 33 is provided inside the armrest support 3 to allow the pawl 32 to engage any one of the ratchet grooves 311. An unlocking position 312 is also provided inside the armrest support 3. A pawl control structure is also provided between the rotating member 31 and the pawl 32.

[0056] When the rotating member 31 rotates to its position in the first rotation direction, the pawl control structure causes the pawl 32 to disengage from the ratchet groove 311 and at least a portion of the pawl 32 to enter the unlock position 312.

[0057] When the rotating part 31 rotates into position in the second rotation direction, the pawl control structure causes the pawl 32 to disengage from the unlock position 312 and re-engage with the ratchet groove 311.

[0058] Specifically, in this embodiment, the rotating member 31 is axially fixed to the connecting shaft that is circumferentially fixed relative to the supporting member 1. The connecting shaft can be a square or triangular connecting shaft. Any connecting shaft that can achieve the above connection purpose can be selected. This embodiment does not make specific limitations on this.

[0059] It can be understood that the rotating member 31 is axially fixedly connected with the connecting shaft fixed in the circumferential direction of the relative support 1, so that the support 1 drives the rotating member 31 to rotate synchronously when rotating, and the angle of the handrail support 3 is locked and released through the meshing of the ratchet groove 311 and the pawl 32, so as to control the adjustment of the angle. Due to the meshing of the ratchet groove 311 of the rotating member 31 and the pawl 32, when the rotating member 31 rotates to the position in the first rotation direction or the second rotation direction, the pawl control structure makes at least part of the pawl 32 enter or leave the unlocking position 312, so as to realize the angle cycle control.

[0060] In combination Figures 11-13 As shown in the specific embodiment of the present application, the concave-convex limiting structure includes a limiting boss 313 arranged on the rotating member 31, and an arc-shaped limiting track groove 34 arranged on the handrail support 3, and the limiting boss 313 is located in the arc-shaped limiting track groove 34; the pawl control structure includes a pawl pushing boss 321 arranged on the pawl 32, and an arc-shaped track groove 314 arranged on the rotating member 31, and the pawl pushing boss 321 is located in the arc-shaped track groove 314.

[0061] Specifically, in the embodiment, the pawl pushing boss 321 of the pawl control structure is located in the arc-shaped track groove 314, and when the rotating member 31 rotates to the position in the first rotation direction or the second rotation direction, the pawl pushing boss 321 pushes or pulls at least part of the pawl 32 into or out of the unlocking position 312.

[0062] It can be understood that in the embodiment, the concave-convex limiting structure limits and controls the rotation angle of the rotating member 31 through the cooperation of the limiting boss 313 and the arc-shaped limiting track groove 34. The pawl control structure controls the locking and unlocking of the pawl 32 through the movement of the pawl pushing boss 321 in the arc-shaped track groove 314, so as to control the rotation state of the rotating member 31.

[0063] It can be understood by those skilled in the art that the above description is only a preferred embodiment of the present application and is not used to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, and those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement of part of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A chair armrest, comprising a support member (1) and an armrest board (2), characterized in that, The handrail (2) includes a rotating member (21) rotatably connected to the support member (1) and an adjusting member (22) movably connected to the rotating member (21) in a first moving direction. A cantilever spring-type angle control mechanism for controlling the rotation angle of the rotating member (21) is provided between the support member (1) and the rotating member (21). At least a portion of the cantilever spring-type angle control mechanism is provided on the support member (1), and the remaining portion of the cantilever spring-type angle control mechanism is provided on the rotating member (21). A cantilever spring-type position control mechanism is provided between the rotating member (21) and the adjusting member (22) along the first moving direction. At least a portion of the cantilever spring-type position control mechanism is provided on the rotating member (21), and the remaining portion is provided on the adjusting member (22).

2. The chair armrest according to claim 1, characterized in that, The cantilever spring-type angle control mechanism includes at least one cantilever spring (112) and several cantilever spring locking grooves (211). One of the cantilever spring (112) and the cantilever spring locking groove (211) is disposed on the rotating member (21), and the other is disposed on the support member (1). Each cantilever spring (112) has a locking part (1121) at its suspended end that is engaged in any one of the locking grooves.

3. A chair armrest according to claim 2, characterized in that, The cantilever spring piece (112) is inclined from top to bottom.

4. A chair armrest according to claim 2, characterized in that, A fixing member (11) is provided on the top side of the support member (1), the rotating member (21) is rotatably connected to the fixing member (11), and the end of the cantilever spring piece (112) away from the locking part (1121) is connected to the fixing member (11).

5. A chair armrest according to claim 4, characterized in that, The cantilever spring piece (112) has two pieces, and the two cantilever spring pieces (112) are symmetrically distributed with respect to the rotation center of the rotating member (21) and the fixing member (11). The fixing member (11) is also provided with two pressure relief clearance holes (111) for the cantilever spring pieces (112) to be accommodated. The end of the cantilever spring piece (112) away from the locking part (1121) is connected to the hole wall of the pressure relief clearance hole (111).

6. A chair armrest according to claim 4, characterized in that, The adjusting member (22) is provided with a strip hole (221) through which the fixing member (11) passes.

7. A chair armrest according to claim 1, characterized in that, The cantilever spring-type position control mechanism includes at least one cantilever spring (212) and a plurality of locking grooves (222). One of the cantilever spring (212) and the locking grooves (222) is disposed on the adjusting member (22), and the other is disposed on the rotating member (21). A locking protrusion (2121) is provided at the suspended end of the cantilever spring (212) and is engaged in any one of the locking grooves (222).

8. A chair armrest according to claim 7, characterized in that, The adjusting member (22) is provided with two rows of locking grooves (222), and each row of locking grooves (222) is paired with a cantilever spring plate (212).

9. A chair armrest according to claim 1, characterized in that, The chair armrest also includes an armrest support (3), and a cyclic angle control mechanism for adjusting the tilt angle of the support (1) is provided between the support (1) and the armrest support (3). The cyclic angle control mechanism includes a rotating member (31) located inside the armrest support (3) and having a plurality of ratchet grooves (311). The rotating member (31) is axially fixed to a connecting shaft that is circumferentially fixed relative to the support (1). A concave-convex limiting structure is provided between the armrest support (3) and the rotating member (31) to limit the position of the rotating member (31) in a first rotation direction and a second rotation direction. An elastic member (33) is provided inside the armrest support (3) to allow the pawl (32) to engage any one of the ratchet grooves (311). An unlocking position (312) is also provided inside the armrest support (3). A pawl control structure is also provided between the rotating member (31) and the pawl (32). When the rotating member (31) is rotated into position in the first rotation direction, the pawl control structure causes the pawl (32) to disengage from the ratchet groove (311) and at least a portion of the pawl (32) to enter the unlock position (312). When the rotating member (31) is rotated into position in the second rotation direction, the pawl control structure causes the pawl (32) to disengage from the unlock position (312) and re-engage with the ratchet groove (311).

10. A chair armrest according to claim 9, characterized in that, The concave-convex limiting structure includes a limiting boss (313) provided on the rotating member (31), and an arc-shaped limiting track groove (34) provided on the handrail support member (3), wherein the limiting boss (313) is located in the arc-shaped limiting track groove (34); the pawl control structure includes a pawl pushing boss (321) provided on the pawl (32), and an arc-shaped track groove (314) provided on the rotating member (31), wherein the pawl pushing boss (321) is located in the arc-shaped track groove (314).

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