Adjusting and positioning mechanism and seat

Abstract

The utility model provides an adjusting and positioning mechanism and a seat. The adjusting and positioning mechanism comprises an inner fixing piece, an outer rotating ring, a positioning piece and a linkage mechanism arranged between the positioning piece and the outer rotating ring, the outer rotating ring is arranged on the inner fixing piece with the fixed teeth in a sleeving mode to form rotating connection, the positioning piece matched with the fixed teeth on the outer wall of the inner fixing piece in a tooth connection mode is arranged between the outer rotating ring and the inner fixing piece, and then the linkage structure between the positioning piece and the outer rotating ring is used for enabling the movable teeth and the fixed teeth on the positioning piece to form the circulating type positioning and separating effect. The whole design structure is compact, the occupied space is small, and the adjusting and positioning process is simple and convenient; the seat comprises a seat body and handrails arranged on the two sides of the seat body, the adjusting and positioning mechanism is arranged on the seat body, the outer rotating ring is connected with the rear ends of the handrails, and free adjustment of the deflection angle of the handrails can be achieved without emptying the interiors of the handrails.

Description

Technical Field

[0001] The utility model relates to the field of seats, in particular to an adjustment and positioning mechanism and a seat. Background Art

[0002] In order to improve the user experience, existing ergonomic chairs have longitudinally rotatable armrests installed at both ends of the chair body, so that the armrests can fit the arms more closely as the human body's posture changes. In order to achieve this function, an adjustment and positioning mechanism is provided between the armrest and the chair body, so that the armrest can be self-locked and fixed by the adjustment and positioning mechanism after longitudinal deflection, thereby enabling the armrest to achieve the effect of supporting the arm. However, this adjustment and positioning mechanism still has certain defects.

[0003] For example, an armrest rotation adjustment device is shown in the announcement number CN214963958. The rotation adjustment device is arranged at the connection between the armrest and the chair body, and the fixed gear plate 3 and the movable gear 4 in the rotation adjustment device cooperate to realize the free adjustment function of the height and angle of the armrest. However, the structure for realizing the function is relatively complex, and the whole device occupies a large space. The movable gear 4 requires a part of the armrest to be hollowed out to accommodate it. The processing process is too complicated, and it is easy to increase the production cost of the chair. Summary of the invention

[0004] In order to solve the above-mentioned technical problems, the purpose of the utility model is to provide an adjustment and positioning mechanism, which forms a rotational connection by sleeve-arranging an outer rotating ring on an inner fixed part with fixed teeth, and arranging a positioning part between the two to engage with the fixed teeth on the outer wall of the inner fixed part, and then utilizing the linkage structure between the positioning part and the outer rotating ring to make the movable teeth and the fixed teeth on the positioning part form a cyclic positioning and separation effect; the entire design structure is compact, occupies little space, and the adjustment and positioning process is simple and convenient.

[0005] A seat is further provided, which includes a seat body and armrests arranged on both sides of the seat body. The adjustment and positioning mechanism is arranged on the seat body, and the outer rotating ring is connected to the rear end of the armrest. The armrest can be freely adjusted in deflection angle without hollowing out the inside of the armrest.

[0006] The technical solution of the utility model is achieved in this way:

[0007] An adjustment and positioning structure, comprising:

[0008] An internal fixing member, wherein a fixed tooth groove is provided on the outer wall surface of the internal fixing member, the fixed tooth groove is recessed inwardly, thereby forming a starting wall surface and an ending wall surface in the fixed tooth groove, and fixed teeth arranged in an arc-shaped trajectory are provided between the starting wall surface and the ending wall surface, and the fixed teeth are inclined in a counterclockwise direction;

[0009] An outer rotating ring is sleeved on the outer wall of the inner fixing member, and the outer rotating ring can rotate circumferentially relative to the inner fixing member;

[0010] A positioning member is arranged between the inner wall surface of the outer rotating ring and the fixed tooth groove, and the positioning member can rotate synchronously with the outer rotating ring; a movable tooth that can be continuously engaged with the fixed tooth is arranged on the outer wall of the positioning member facing the fixed tooth groove;

[0011] The linkage structure is arranged between the positioning member and the rotating member. When the positioning member is at the starting wall surface, the linkage structure can positively link the positioning member to make the movable teeth engage with the fixed teeth; when the positioning member rotates to the ending wall surface, the linkage structure can reversely link the positioning member to separate the movable teeth from the fixed teeth.

[0012] The adjustment and positioning mechanism has an adjustment state, a separation state and a reset state. When the positioning mechanism is in the reset state, the positioning piece contacts the starting wall surface, and the movable teeth are engaged with the fixed teeth; when the positioning mechanism is switched to the adjustment state, the outer rotating ring rotates counterclockwise to a predetermined position, at which time the positioning piece rotates from the starting wall surface to the ending wall surface driven by the outer rotating ring, and the movable teeth and the fixed teeth are continuously engaged with each other and then bite each other to limit the reverse rotation of the outer rotating ring; when the positioning mechanism is switched to the separation state, when the positioning piece rotates to the ending wall surface driven by the outer rotating ring, the linkage structure reversely links the positioning piece, thereby separating the fixed teeth from the movable teeth, and at this time the outer rotating ring can drive the positioning piece to rotate in the opposite direction; when the outer rotating ring drives the positioning piece to rotate back to the starting wall surface in the opposite direction, the linkage structure can again forwardly link the positioning piece, so that the movable teeth on the positioning piece are again engaged with the fixed teeth; at this time, the positioning mechanism switches to the reset state.

[0013] Preferably, the bottom edge of the outer rotating ring extends inwardly to form an inner wall surface facing the positioning member, and the linkage structure is a slide groove group arranged between the inner wall surface and the positioning member, and a slide rod assembly inserted into the slide groove group. The slide groove group is arranged on the inner wall surface, and the slide rod assembly is arranged on the end surface of the positioning member facing the inner wall surface; the slide groove group and the slide rod assembly can control the matching state of the movable teeth and the fixed teeth when the positioning member and the outer rotating ring rotate synchronously, and the structure is simple and the design is ingenious.

[0014] Preferably, the slide groove group includes a first slide groove and a second slide groove which are spaced apart, and the first slide groove and the second slide groove each include a starting end and an ending end, and the slide rod assembly includes a first slide rod and a second slide rod which are respectively located in the first slide groove and the second slide groove; the first slide rod and the second slide rod slide synchronously between the starting end and the ending end of the first slide groove and the second slide groove, respectively, so that the positioning mechanism can switch freely between the reset state and the adjustment state; so that the movable teeth and the fixed teeth can be connected or separated.

[0015] Preferably, the distances between the starting ends of the first slide groove and the center of the outer rotating ring are different; the first slide groove and the second slide groove extend obliquely from their respective starting ends to their respective terminal ends, so that the terminal ends of the first slide groove and the second slide groove gradually approach the center of the outer rotating ring; the oblique extension path can make the positioning member produce different motion trajectories when it rotates in the same direction as the outer rotating ring, so that the sliding rod in the slide groove can link the positioning member in the forward or reverse direction.

[0016] Preferably, the top end of the outer rotating ring is recessed inward to form a receiving groove, and a sealing plate is connected to the receiving groove; the sealing plate can block the top end of the outer rotating ring to prevent the moving teeth on the positioning member from slipping out of the matching range of the moving teeth along the axial direction of the outer rotating ring.

[0017] Preferably, a first slide groove and a second slide groove are arranged at intervals on the end surface of the sealing plate facing the positioning member, and a first slide rod and a second slide rod are correspondingly provided on the end surface of the positioning member facing the sealing plate, which are respectively inserted into the first slide groove and the second slide groove; two linkage structures are formed on the end surfaces on both sides of the positioning member to make the state switching of the movable teeth and the fixed teeth more stable.

[0018] Preferably, a position on the inner wall surface of the outer rotating ring close to the starting wall surface of the fixed tooth groove is recessed inward to form a retreat groove, a column is provided in the retreat groove, and a spring sheet is connected between the positioning member and the column; when the adjustment and positioning mechanism is in an adjustment state, the spring sheet provides an elastic supporting force for the positioning member, so that the positioning member elastically expands and contracts in the radial direction to ensure continuous tooth engagement between the movable teeth and the fixed teeth; the spring sheet can make the movable teeth and the fixed teeth more stable during continuous tooth engagement through its own elasticity.

[0019] Preferably, one end of the spring sheet facing the column is circumferentially wrapped around the outer wall of the column, so that the corresponding end of the spring sheet is hooked on the column; the wrap-around connection method is simple and efficient, and the spring sheet can provide elastic support for the positioning piece.

[0020] A chair is provided, comprising a chair body, armrests symmetrically arranged on the left and right sides of the chair body, and an adjustment and positioning mechanism, wherein the rear ends of the armrests are connected to an outer rotating ring, and the inner fixing parts are connected to the chair body.

[0021] Preferably, a closing cover is connected to the outer end surface of the armrest, and the closing cover completely closes the exposed end surface of the adjustment and positioning mechanism, so that the entire adjustment and positioning mechanism has good sealing performance and the appearance of the entire chair is more simple and beautiful.

[0022] The principle and beneficial effects of the utility model using the above technical solution are:

[0023] The utility model provides an armrest rotation positioning structure, which forms a rotation connection by sleeve-arranging an outer rotating ring on an inner fixing part with fixed teeth, and arranging a positioning part that cooperates with the fixed teeth on the outer wall of the inner fixing part between the two, and then utilizing the linkage structure between the positioning part and the outer rotating ring to enable the movable teeth and the fixed teeth on the positioning part to form a cyclic positioning and separation effect; this ring-sleeve type cyclic linkage design is simple and exquisite, easy to manufacture and process, and reduces the space occupied by the entire adjustment and positioning mechanism.

[0024] Furthermore, a seat is provided, in which an adjustment and positioning mechanism is arranged between the armrest and the chair body. The longitudinal deflection angle of the armrest can be adjusted by connecting the outer rotating ring to the armrest, and there is no need to open a accommodating area on the armrest, which simplifies the processing difficulty of the armrest and reduces the production cost of the seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 An exploded view of the adjustment and positioning mechanism at the connection of the chair body;

[0026] Figure 2 is a schematic diagram of the structure of the positioning member;

[0027] Figure 3 is a schematic diagram of the structure of the outer rotating ring;

[0028] Figure 4 It is a structural schematic diagram when the movable teeth are connected with the fixed teeth;

[0029] Figure 5 It is a schematic diagram of the structure when the moving teeth and the fixed teeth are separated;

[0030] Figure 6 It is a structural schematic diagram of the slideway group on the sealing plate;

[0031] Figure 7 is a schematic diagram of the structure of the internal fixing member;

[0032] The reference numerals of the figures are: 1-chair body, 2-mounting seat, 3-armrest, 4-positioning member, 5-inner fixing member, 6-outer rotating ring, 7-spring, 8-pressing plate, 9-locking screw, 10-bolt, 11-closing cover, 12-sealing plate, 21-flat body, 41-movable tooth, 42-first sliding rod, 43-second sliding rod, 51-flat hole, 52-fixed tooth, 53-starting wall, 54-ending wall, 61-accommodating groove, 62-column, 63-retreat groove, 64-first sliding groove, 65-second sliding groove, 66-inner wall. DETAILED DESCRIPTION

[0033] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0034] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0035] The specific implementation of the utility model is as follows:

[0036] like Figure 1-7 As shown, the utility model first provides an adjustment and positioning mechanism, including an internal fixing member 5, which is an annular structure. The internal fixing member 5 is sleeved on a mounting seat 2. Specifically, a flat body 21 is connected to the mounting seat 2. The flat body 21 is formed by milling a cylindrical structure on the outer wall of the cylinder. A flat hole is provided at the center point of the internal fixing member 5, and the flat hole is sleeved on the flat body 2 to keep the internal fixing member 5 circumferentially fixed.

[0037] Further, if Figure 7 As shown, a fixed tooth groove is provided on the outer wall surface of the inner fixing member 5, and the fixed tooth groove is recessed inwardly, thereby forming a starting wall surface 53 and an ending wall surface 54 in the fixed tooth groove, and fixed teeth 52 arranged in a circular arc trajectory are provided between the starting wall surface 53 and the ending wall surface 54, and the fixed teeth 52 are inclined in the counterclockwise direction to form a ratchet structure; an outer rotating ring 6 is sleeved on the outer wall of the inner fixing member 5, and the outer rotating ring 6 can rotate circumferentially relative to the inner fixing member 5; a positioning member 4 is arranged between the inner wall surface of the outer rotating ring 6 and the fixed tooth groove, and the positioning member 4 can rotate synchronously with the outer rotating ring 6; a movable tooth 41 that can be continuously toothed with the fixed tooth 52 is provided on the outer wall of the positioning member 4 facing the fixed tooth groove, and the movable tooth 41 is a ratchet that can cooperate with and continuously toothed with the fixed tooth 52. This ratchet design can enable the positioning member 4 to form a one-way rotation relative to the inner fixing member 5, and the positioning member 4 after rotation is in a self-locking state.

[0038] Furthermore, the adjustment and positioning mechanism further includes a linkage structure arranged between the positioning member 4 and the rotating member, and the linkage structure plays a linkage role and a connection role at the same time. The connection role means that the linkage structure can drive the positioning member 4 and the outer rotating ring 6 to rotate circumferentially at the same time, and the linkage role means that it can control the matching and separation state of the movable teeth 41 and the fixed teeth 52. When the positioning member 4 is at the starting wall surface 53, the linkage structure can positively link the positioning member 4 to make the movable teeth 41 and the fixed teeth 52 engage with each other; when the positioning member 4 rotates to the ending wall surface 54, the linkage structure can reversely link the positioning member 4 to separate the movable teeth 41 from the fixed teeth 52. Specifically, the linkage structure is a slide groove and slide rod structure, and in order to set up the linkage structure, the bottom edge of the outer rotating ring 6 extends inward, thereby forming an inner wall surface 66 facing the positioning member 4, and the linkage structure is a slide groove group arranged between the inner wall surface 66 and the positioning member 4, and a slide rod assembly inserted into the slide groove group. The slide groove group is arranged on the inner wall surface 66, and the slide rod assembly is arranged on the end surface of the positioning member 4 facing the inner wall surface 66; the slide groove group and the slide rod assembly can form a plug-in fit, so that the positioning member 4 and the outer rotating ring 6 rotate synchronously, and can simultaneously control the matching state of the movable tooth 41 and the fixed tooth 52, with a simple structure and ingenious design.

[0039] Further, if Figure 4-5 As shown, the adjustment and positioning mechanism has an adjustment state, a separation state and a reset state. When the positioning mechanism is in the reset state, the positioning member 4 contacts the starting wall surface 53, and the movable teeth 41 are engaged with the fixed teeth 52; when the positioning mechanism is switched to the adjustment state, the outer rotating ring 6 rotates counterclockwise to a predetermined position. At this time, the positioning member 4 rotates from the starting wall surface 53 to the ending wall surface 54 under the drive of the outer rotating ring 6, and the movable teeth 41 and the fixed teeth 52 are continuously engaged with each other and then bite each other to limit the outer rotating ring 6 from rotating in the opposite direction; when the positioning mechanism is switched to the separation state, the positioning member 4 rotates to the ending wall surface 54 under the drive of the outer rotating ring 6, so that the linkage structure reversely links the positioning member 4, and then the fixed teeth 52 are separated from the movable teeth 41, and the outer rotating ring 6 can drive the positioning member 4 to rotate in the opposite direction; when the outer rotating ring 6 drives the positioning member 4 to rotate back to the starting wall surface 53 in the opposite direction, the linkage structure can again forwardly link the positioning member 4, so that the movable teeth 41 on the positioning member 4 are again engaged with the fixed teeth 52; at this time, the positioning mechanism switches to the reset state.

[0040] Further, the slide groove group includes a first slide groove 64 and a second slide groove 65 which are arranged at intervals, and the first slide groove 64 and the second slide groove 65 both include a starting end and a terminal end, wherein the starting end of the first slide groove 64 is close to the starting wall 53, and the other end is the terminal end, and the terminal end of the second slide groove 65 is close to the terminal wall 54, and the other end is the starting end; the slide rod assembly and the positioning member 4 are integrally formed, including a first slide rod 42 and a second slide rod 43 which are respectively located in the first slide groove 64 and the second slide groove 65; the first slide rod 42 and the second slide rod 43 slide synchronously between the starting end and the terminal end of the first slide groove 64 and the second slide groove 65, respectively, so that the positioning mechanism can switch freely between the reset state and the adjustment state; so that the movable teeth 41 and the fixed teeth 52 can be connected or separated.

[0041] Furthermore, if the slide bar assembly and the slide slot assembly are simply fixedly connected together and are on the same rotation trajectory, the positioning member 4 cannot be linked. Therefore, in order to achieve the separation or cooperation of the movable tooth 41 and the fixed tooth 52, the linkage structure first makes the distances between the starting ends of the first slide slot 64 and the second slide slot 65 and the center of the outer rotating ring 6 different, so that the positioning member 4 can produce an eccentric rotation effect when the outer rotating ring 6 rotates circumferentially; then the first slide slot 64 and the second slide slot 65 are configured to extend obliquely from their respective starting ends to their respective terminal ends, so that the terminal ends of the first slide slot 64 and the second slide slot 65 gradually approach the center of the outer rotating ring 6; that is, when the first slide bar 42 and the second slide bar 43 are respectively in the first slide slot 64 and the second slide slot 65, in addition to being able to slide along the corresponding slide slots, they can also rely on the first slide bar 42 and the second slide bar 43 as the center of the circle to rotate relative to the outer rotating ring 6, so when the first slide bar 42 and the second slide bar 43 are from their respective starting ends to their respective terminal ends When the end begins to rotate circumferentially with the outer rotating ring 6, the oblique extension path of the positioning member 4 can make the positioning member 4 produce different motion trajectories when rotating in the same direction as the outer rotating ring 5. This motion trajectory will cause different small distance differences between the starting ends of the two slide grooves relative to the center of the outer rotating ring 5. This small distance difference will cause the positioning member 4 to have a small rotation tendency, but this small distance difference will not cause the movable tooth 41 and the fixed tooth 52 on the positioning member 4 to separate; this rotation tendency will drive the first slide bar 42 or the second slide bar 43 to be squeezed and contacted with the corresponding inner wall of the slide groove. Since the slide groove is obliquely extended toward the center of the outer rotating ring 6, when the positioning member 4 rotates to just contact the end wall 54, the first slide bar 42 and the second slide bar 43 will be squeezed from the starting end or the end end to the other end by the obliquely extended slide groove wall, so that the linkage structure achieves positive linkage with the positioning member 4; of course, if the slide bar assembly rotates in the opposite direction from the end end, the linkage structure can also achieve reverse linkage with the positioning member 4.

[0042] Furthermore, in order to enable the positioning member 4 to better cooperate with the outer rotating ring 6 and the fixed tooth 52, the top end of the outer rotating ring 6 is recessed inward to form a receiving groove 61, and a sealing plate 12 is connected to the receiving groove 61; the sealing plate 12 can block the top end of the outer rotating ring 6 to prevent the movable tooth 41 on the positioning member 4 from slipping out of the matching range of the movable tooth 51 along the axial direction of the outer rotating ring 6.

[0043] Further, if Figure 6 As shown, in order to make the linkage process smoother, a first slide groove 64 and a second slide groove 65 are also arranged at intervals on the end surface of the sealing plate 12 facing the positioning member 4, and the end surface of the positioning member 4 facing the sealing plate 12 is also correspondingly provided with a first slide rod 42 and a second slide rod 43 respectively inserted into the first slide groove 64 and the second slide groove 65; two linkage structures are formed on the end surfaces on both sides of the positioning member 4, so that the state switching of the movable tooth 41 and the fixed tooth 52 is more stable.

[0044] Further, if Figure 1-2 As shown, in order to prevent the entire adjusting and positioning mechanism from falling out of the flat body 21, a clamping assembly is connected to the middle of the sealing plate 12, and the clamping assembly includes a locking screw 9 and a pressure plate 8 in contact with the sealing plate. The locking screw 9 passes through the pressure plate 8 and the sealing plate 12 and is connected to the outer end surface of the flat body 21 to prevent the outer rotating ring 6 and the sealing plate 12 from axial movement. This design enables the various components of the adjusting and positioning mechanism to remain stable during operation, thereby preventing the entire adjusting and positioning mechanism from being separated from the mounting seat 2.

[0045] Further, if Figure 3-4 As shown, in order to enable the movable teeth 41 and the fixed teeth 52 to achieve continuous tooth engagement and elastic reset, the position on the inner wall surface of the outer rotating ring 6 close to the starting wall surface 53 of the fixed tooth groove is recessed inward to form a retreat groove 63, and a column 62 is provided in the retreat groove 63, and a spring piece 7 is connected between the positioning member 4 and the column 62; when the adjustment and positioning mechanism is in the adjustment state, the spring piece 7 provides an elastic supporting force for the positioning member 4, so that the positioning member 4 elastically expands and contracts in the radial direction to ensure that the movable teeth 41 and the fixed teeth 52 are continuously toothed; the spring piece 7 can make the movable teeth 41 and the fixed teeth 52 more stable during continuous tooth engagement through its own elasticity; when the positioning member 4 contacts the starting wall surface 53, the elastic supporting force generated by the spring piece 7 can also provide an auxiliary reset for the positioning member 4.

[0046] Furthermore, in order to save installation space, the spring sheet 7 is arranged on the adjustment and positioning mechanism in this way: one end of the spring sheet 7 facing the column 62 is circumferentially arranged along the outer wall of the column 62, so that the corresponding end of the spring sheet 7 is hooked on the column 62; the surrounding connection method is simple and efficient, and the spring sheet 7 can provide elastic support for the positioning member 4.

[0047] A seat is provided, such as Figure 1As shown, it comprises a chair body 1, armrests 3 symmetrically arranged on the left and right sides of the chair body 1, and an adjustment and positioning mechanism, the rear end of the armrests 3 is connected to the outer rotating ring 6, and the inner fixing member 5 is connected to the chair body 1; specifically, according to different usage needs, the chair body 1 can be a chair back assembly or a chair seat assembly, the mounting seat 2 is connected to the left and right sides of the chair body 1, the rear end of the armrests 3 is sleeved on the outer wall of the outer rotating ring 6, and is locked on the outer end surface of the outer rotating ring 6 by bolts 10; when the armrests 3 rotate upward, the outer rotating ring 6 and The positioning member 4 rotates in the same direction, and after the rotation stops, the fixed teeth 42 and the movable teeth 51 engage with each other, so that the armrest 3 remains fixed after being adjusted into place; when the armrest 3 continues to rotate and the positioning member 4 rotates to the end wall 54, the linkage structure separates the movable teeth 41 from the fixed teeth 52. At this time, the armrest 3 can be reversed and rotated back to the horizontal position, and the positioning member 4 rotates to the starting wall 53, so that the movable teeth 41 and the fixed teeth 52 enter the toothed state again; therefore, the angle adjustment of the armrest 3 can be easily achieved by relying on the adjustment and positioning mechanism.

[0048] Furthermore, in order to ensure the dustproof effect of the rear end of the armrest 3 and the adjustment and positioning mechanism, a closing cover 11 is connected to the outer end surface of the armrest 3, and the closing cover 11 completely closes the exposed end surface of the adjustment and positioning mechanism; the entire adjustment and positioning mechanism has good sealing performance, and the appearance of the entire chair is more simple and beautiful.

[0049] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. An adjustment and positioning mechanism, characterized in that it comprises: An internal fixing member (5), wherein a fixed tooth groove is provided on an outer wall surface of the internal fixing member (5), the fixed tooth groove is recessed inwardly, thereby forming a starting wall surface (53) and an ending wall surface (54) in the fixed tooth groove, and fixed teeth (52) arranged in a circular arc track are provided between the starting wall surface (53) and the ending wall surface (54), and the fixed teeth (52) are inclined in a counterclockwise direction; An outer rotating ring (6) is sleeved on the outer wall of the inner fixing member (5), and the outer rotating ring (6) can rotate circumferentially relative to the inner fixing member (5); A positioning member (4) is arranged between the inner wall surface of the outer rotating ring (6) and the fixed tooth groove, and the positioning member (4) can rotate synchronously with the outer rotating ring (6); a movable tooth (41) that can be continuously tooth-engaged with the fixed tooth (52) is provided on the outer wall of the positioning member (4) facing the fixed tooth groove; A linkage structure is arranged between the positioning member (4) and the rotating member. When the positioning member (4) is at the starting wall surface (53), the linkage structure can positively link the positioning member (4) so ​​that the movable teeth (41) and the fixed teeth (52) are engaged with each other. When the positioning member (4) rotates to the ending wall surface (54), the linkage structure can reversely link the positioning member (4) so ​​that the movable teeth (41) and the fixed teeth (52) are separated. The adjustment and positioning mechanism has an adjustment state, a separation state and a reset state. When the positioning mechanism is in the reset state, the positioning member (4) contacts the starting wall surface (53), and the moving teeth (41) and the fixed teeth (52) are in tooth engagement. When the positioning mechanism is switched to the adjustment state, the outer rotating ring (6) rotates counterclockwise to a predetermined position. At this time, the positioning member (4) rotates from the starting wall surface (53) to the ending wall surface (54) driven by the outer rotating ring (6), and the moving teeth (41) and the fixed teeth (52) are continuously in tooth engagement and then mesh with each other, so as to limit the outer rotating ring (6) from rotating in the reverse direction. When the positioning mechanism is switched to the adjustment state, the outer rotating ring (6) rotates counterclockwise to a predetermined position. At this time, the positioning member (4) rotates from the starting wall surface (53) to the ending wall surface (54) driven by the outer rotating ring (6), and the moving teeth (41) and the fixed teeth (52) are continuously in tooth engagement and then mesh with each other, so as to limit the outer rotating ring (6) from rotating in the reverse direction. When the positioning mechanism switches to the separation state, when the positioning member (4) rotates to the end wall surface (54) driven by the outer rotating ring (6), the linkage structure reversely links the positioning member (4), thereby separating the fixed teeth (52) from the movable teeth (41), and the outer rotating ring (6) can drive the positioning member (4) to rotate in the reverse direction; when the outer rotating ring (6) drives the positioning member (4) to rotate back to the starting wall surface (53), the linkage structure can positively link the positioning member (4) again, so that the movable teeth (41) on the positioning member (4) and the fixed teeth (52) are again engaged; at this time, the positioning mechanism switches back to the positioning state.

2. The adjusting and positioning mechanism according to claim 1, characterized in that: The bottom edge of the outer rotating ring (6) extends inwardly to form an inner wall surface (66) facing the positioning member (4). The linkage structure comprises a slide groove group arranged between the inner wall surface (66) and the positioning member (4), and a slide rod assembly inserted into the slide groove group. The slide groove group is arranged on the inner wall surface (66), and the slide rod assembly is arranged on the end surface of the positioning member (4) facing the inner wall surface (66).

3. The adjusting and positioning mechanism according to claim 2, characterized in that: The slide groove group comprises a first slide groove (64) and a second slide groove (65) arranged at intervals on the inner wall surface (66); the first slide groove (64) and the second slide groove (65) both comprise a starting end and a terminating end; the slide bar assembly comprises a first slide bar (42) and a second slide bar (43) respectively located in the first slide groove (64) and the second slide groove (65); the first slide bar (42) and the second slide bar (43) respectively slide synchronously between the starting end and the terminating end of the first slide groove (64) and the second slide groove (65), so that the positioning mechanism can be freely switched between a reset state and an adjustment state.

4. The adjusting and positioning mechanism according to claim 3, characterized in that: The distances between the starting ends of the first slide groove (64) and the center of the outer rotating ring (6) are different; and the first slide groove (64) and the second slide groove (65) both extend obliquely along their starting ends, so that the terminal ends of the first slide groove (64) and the second slide groove (65) gradually approach the center of the outer rotating ring (6).

5. The adjusting and positioning mechanism according to claim 3, characterized in that: The top end surface of the outer rotating ring (6) is recessed inwards to form a receiving groove (61), and a sealing plate (12) is connected to the receiving groove (61).

6. The adjusting and positioning mechanism according to claim 5, characterized in that: A first slide groove (64) and a second slide groove (65) are also arranged at intervals on the end surface of the sealing plate (12) facing the positioning member (4), and a first slide rod (42) and a second slide rod (43) are also correspondingly arranged on the end surface of the positioning member (4) facing the sealing plate (12), which are inserted into the first slide groove (64) and the second slide groove (65) respectively.

7. The adjusting and positioning mechanism according to claim 1, characterized in that: The inner wall surface of the outer rotating ring (6) is recessed inwardly at a position close to the starting wall surface (53) of the fixed tooth groove to form a retreat groove (63), wherein a column (62) is provided in the retreat groove (63), and a spring sheet (7) is connected between the positioning member (4) and the column (62); when the adjustment and positioning mechanism is in an adjustment state, the spring sheet (7) provides an elastic support force for the positioning member (4), so that the positioning member (4) elastically expands and contracts in the radial direction, thereby ensuring that the movable teeth (41) and the fixed teeth (52) are continuously engaged with each other.

8. The adjusting and positioning mechanism according to claim 7, characterized in that: One end of the spring sheet (7) facing the column (62) surrounds the outer wall of the column (62) in the circumferential direction, so that the corresponding end of the spring sheet (7) is hooked on the column (62).

9. A seat, characterized in that: It comprises a chair body (1), armrests (3) symmetrically arranged on the left and right sides of the chair body (1), and the adjustment and positioning mechanism according to claim 1, wherein the rear end of the armrest (3) is connected to the outer rotating ring (6), and the inner fixing part (5) is connected to the chair body (1).

10. A seat according to claim 9, characterized in that: The outer end surface of the handrail (3) is connected to a closing cover (11), and the closing cover (11) completely closes the exposed end surface of the adjustment and positioning mechanism.

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