CN214963958U

CN214963958U - Handrail rotation adjusting device and seat

Info

Publication number: CN214963958U
Application number: CN202121366986.6U
Authority: CN
Inventors: 王大秋; 周骏
Original assignee: Zhejiang Motostuhl Furniture Technology Co ltd
Current assignee: Zhejiang Motostuhl Furniture Technology Co ltd
Priority date: 2021-06-18
Filing date: 2021-06-18
Publication date: 2021-12-03
Anticipated expiration: 2031-06-18

Abstract

The utility model discloses a handrail rotation adjusting device and a seat, which comprises a mounting seat, a handrail body and a rotary positioning mechanism; the rotary positioning mechanism comprises a fixed gear disc arranged on the mounting seat and movable gear pieces correspondingly arranged on the handrail body; the fixed gear is arranged on the fixed gear disc, the movable gear and the handrail body keep synchronous rotation, the movable gear is provided with movable teeth, and the movable gear elastically stretches along the radial direction of the fixed gear disc; in the process that the handrail body rotates anticlockwise and upwards, the fixed teeth continuously extrude and act on the movable tooth piece to stretch, so that the movable teeth are sequentially matched with the fixed teeth in a tooth joint mode by taking the profile of the fixed teeth as a path; the handrail device is characterized by also comprising a rotary reset mechanism for enabling the handrail body to rotate and reset, wherein the upper end of the fixed tooth is provided with a locking end, and the lower end of the fixed tooth is provided with a reset end; when the movable gear piece rotates to the locking end by rotating the reset mechanism, the movable teeth are completely separated from the fixed teeth, and the handrail body can be reset in a rotating way; and when the movable gear piece rotates to the reset end, the movable gear is matched with the fixed gear again.

Description

Handrail rotation adjusting device and seat

Technical Field

The utility model relates to a thing to sit on field, in particular to handrail rotates adjusting device and thing to sit on.

Background

Most of the existing seat armrests are fixed in height, so that the use requirements of different users and different occasions are difficult to meet, the proper height adjustment of the armrests is beneficial to keeping the correct body posture and balance, and the upper limbs can be placed at a comfortable position. The upper arm is forced to be lifted up when the armrest is too high, and fatigue is easily caused; if the armrest is too low, the upper body needs to be tilted forward to maintain balance, so that the armrest is easy to fatigue and affects breathing; it is desirable to design the height of the armrests to be adjustable to suit people of different heights.

Furthermore, although there are some height-adjustable armrests on the market, the height adjustment is usually performed completely in the vertical direction, and the armrests are straight up and down; when the arms of the human body are lifted, the angle is changed; thus, the above adjusting mode is relatively rigid, and the placing comfort of the arms is poor. In addition, most of the existing handrail adjusting structures adopt a lifting structure, and a handrail surface, a lifting rod and a lifting sleeve which are positioned below the handrail surface are required to be arranged; this results in a more complex structure and a larger footprint, which is not in line with modern, simple and aesthetically pleasing requirements.

Disclosure of Invention

The utility model overcomes the defects in the prior art and provides a handrail rotation adjusting device which has simple structure, rapid operation and labor saving; the handrail body can rotate upwards anticlockwise for adjustment through the matching of the movable tooth piece and the fixed gear disc; therefore, the angle and the height of the armrest body can be adjusted simultaneously, and the armrest adapts to the dynamic change of the arm of the user; in the rotating and adjusting process, the moving teeth are sequentially in tooth joint fit with the positioning grooves, and the gear feeling is obvious; during operation, the handrail is directly acted on the handrail body, and the operation is rapid and convenient.

The technical scheme of the utility model is realized like this:

a handrail rotation adjusting device comprises an installation seat arranged on a seat, a handrail body rotationally connected to the installation seat, and a rotary positioning mechanism arranged between the handrail body and the installation seat; the rotary positioning mechanism comprises a fixed gear disc arranged on the mounting seat and movable gear pieces correspondingly arranged on the handrail body; fixed teeth which are arranged in a circular arc shape are arranged on the fixed tooth disc, the fixed teeth incline towards the anticlockwise direction, and a positioning groove is formed between every two adjacent fixed teeth; the movable tooth piece and the handrail body keep synchronous rotation, the movable tooth piece is provided with movable teeth capable of being in tooth connection with the positioning groove, and the movable tooth piece can elastically stretch along the radial direction of the fixed gear disc; in the process that the handrail body rotates anticlockwise and upwards, the fixed teeth continuously extrude and act on the movable tooth piece to stretch, so that the movable teeth are sequentially matched with the positioning grooves in a tooth joint mode by taking the profiles of the fixed teeth as paths; the handrail turning device is characterized by further comprising a turning reset mechanism, wherein the turning reset mechanism comprises a locking piece which is rotationally arranged on the handrail body and a locking groove which is arranged on the movable tooth piece, and a locking block which can be clamped into the locking groove is arranged on the locking piece; the upper end of the fixed tooth is provided with a locking end, and the lower end of the fixed tooth is provided with a resetting end; when the movable teeth rotate to the locking end, the movable tooth piece contracts to the maximum, the locking piece rotates and enables the locking block to be clamped into the locking groove, so that the movable tooth piece and the handrail body are relatively fixed, the movable teeth are completely separated from the fixed teeth, and the handrail body can rotate clockwise to reset; when the handrail body resets to the locking piece and resets and hold the butt, the end extrusion locking piece that resets makes locking piece antiport and drives the locking piece and break away from the locked groove, and movable tooth spare stretches out once more and makes and move tooth and decide tooth meshing.

Preferably, the movable tooth part is in a strip shape, a sliding groove is arranged on the handrail body, and the movable tooth part is in sliding fit in the sliding groove; a spring is arranged between the movable tooth piece and the handrail body, and the spring enables the movable tooth to always have the tendency of being in tooth joint fit with the fixed tooth. In the rotation process of the handrail body, the movable tooth body continuously contracts to extrude the spring and then extends out again under the elastic force action of the spring, so that the rotation process of the handrail body has good damping feeling.

Preferably, the lock member is provided on one side of the movable tooth member, the lock member having a lock portion and an abutting portion; the locking piece is arranged on the locking part; when the handrail body rotates and resets, the butt joint part and the end that resets extrude each other so as to order about the locking piece and rotate.

Preferably, the locking piece is provided with a rotating pin which is rotatably matched in the handrail body; and a torsional spring is arranged on the rotating shaft, and under the action of the torsional spring, the locking piece always has the tendency of rotating to enable the locking block to be clamped into the locking groove. When making the movable tooth rotate to the locking end, the locking piece can be automatic with the locking of movable tooth spare, need not user operation, design benefit.

Preferably, the fixed gear plate is a circular plate, and the fixed teeth are arranged at the outer edge of the front upper end of the fixed gear plate.

Preferably, the diameter of the fixed toothed disc at the locking end is greater than the diameter of the addendum circle of the fixed teeth. So that when the fixed teeth abut against the locking end, the movable teeth member will contract further, so that the movable teeth are disengaged from the fixed teeth.

Preferably, when the movable tooth is in tooth contact fit with the fixed tooth or the movable tooth is not completely separated from the fixed tooth, the lock block and the lock groove are staggered. Only when the movable tooth piece is contracted to the maximum degree, the locking block can be clamped into the locking groove; the lifting adjustment of the handrail body can not be influenced.

Preferably, the mounting seat is provided with a rotating shaft, the root of the handrail body is provided with a rotating shaft sleeve, and the rotating shaft sleeve is rotatably sleeved on the rotating shaft; and one side of the rotating shaft sleeve, which is far away from the mounting seat, is also provided with a mounting groove for accommodating a fixed gear disc, and the fixed gear disc is positioned in the mounting groove and is fixedly connected with the rotating shaft.

Preferably, a limiting mechanism is further arranged between the mounting seat and the rotating shaft sleeve, and the limiting mechanism comprises a limiting groove arranged on one of the mounting seat or the rotating shaft sleeve and a limiting block arranged on the other of the mounting seat or the rotating shaft sleeve. The limiting block and the limiting groove can effectively limit the rotation angle of the handrail body and can further disperse stress; avoid the damage of the rotary positioning mechanism caused by excessive force application during operation.

Preferably, the maximum angle of counterclockwise rotation of the armrest body from the lowest height is between 30 ° and 50 °.

A piece of seating furniture comprises the armrest rotation adjusting device.

Adopted above-mentioned technical scheme the utility model discloses a design departure point, theory and beneficial effect are:

firstly, the handrail rotation adjusting device of the utility model can lead the handrail body to carry out anticlockwise upward rotation adjustment through the matching of the movable tooth piece and the fixed gear disc; therefore, the angle and the height of the armrest body can be adjusted simultaneously, and the armrest adapts to the dynamic change of the arm of the user; in the rotating and adjusting process, the movable teeth are sequentially in tooth joint fit with the positioning grooves, the gear feeling is obvious, a plurality of adjusting positions are provided, and the adjusting range is wider; and during operation, the operation is directly performed on the handrail body, so that the operation is fast and convenient.

Secondly, a rotary reset mechanism is arranged, a locking piece is arranged on one side of the movable tooth piece, and the upper end and the lower end of the fixed tooth are respectively provided with a locking end and a reset end; then when the armrest body rotates to the highest position, the movable teeth are abutted to the locking end, so that the movable teeth further contract; the locking block on the locking piece can be clamped into the locking groove on the movable tooth piece; the lower moving teeth are completely separated from the fixed teeth at the position, so that the handrail body can rotate clockwise to reset; the locking piece is provided with a butting part, when the handrail body is reset to the lowest position, the resetting end and the butting part are mutually extruded, so that the locking piece reversely rotates and drives the locking block to be separated from the locking groove, and the movable tooth piece extends out again to enable the movable tooth to be in tooth joint with the fixed tooth; therefore, the handrail body can rotate and lift from the initial lowest position in a counterclockwise way, and can rotate and reset in a clockwise way when rotating to the highest position; the design is very ingenious, and the operation is labor-saving.

Furthermore, the handrail body is rotationally connected to the mounting seat through a rotating shaft sleeve, and the fixed gear disc and the movable gear piece are both arranged on the handrail body; occupation space is very little, compares with traditional over-and-under type regulation handrail, and the structure is more retrencied undoubtedly, accords with modern brief pleasing to the eye aesthetic requirement.

Drawings

Fig. 1 is a schematic perspective view of the connection between the armrest body and the mounting seat and the fixed gear plate according to the embodiment of the present invention;

fig. 2 is a schematic perspective view of the armrest body in the lowest position according to the embodiment of the present invention;

fig. 3 is a schematic perspective view of the embodiment of the present invention, wherein the fixed gear plate is engaged with the movable gear;

fig. 4 is a schematic perspective view of the assembly of the movable tooth element and the armrest body according to the embodiment of the present invention;

FIG. 5 is a schematic perspective view of the embodiment of the present invention illustrating the engagement between the movable teeth and the fixed teeth;

fig. 6 is a schematic perspective view of the movable tooth element according to the embodiment of the present invention;

fig. 7 is a schematic perspective view illustrating the armrest body rotated to the highest position according to the embodiment of the present invention;

fig. 8 is a schematic perspective view illustrating a connection between the armrest body and the mounting seat according to an embodiment of the present invention.

The figures are numbered: a chair back A; a mounting base 1; a handrail body 2; fixing the gear disc 3; a movable tooth 4; a fixed tooth 5; a positioning groove 6; a moving tooth 7; a rotating shaft 8; a rotating shaft sleeve 9; a shaft hole 10; a mounting groove 11; a chute 12; a connecting column 13; a guide hole 14; a platen 15; a spring 16; a lock member 17; a locking portion 17 a; an abutting portion 17 b; a lock block 18; a lock groove 19; a rotation pin 20; a torsion spring 21; a locking end 22; a reset terminal 23; a limiting groove 24; a stopper 25; a catch plate 26.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

In the description of the present invention, the term "at least one" means one or more unless explicitly defined otherwise. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the present embodiment, the terms relating to the respective directions, such as front and rear, are described in the use state where the user is actually seated on the chair.

The specific implementation manner of the utility model is as follows:

as shown in fig. 1-8, the present invention provides a handrail rotation adjusting device, which comprises a mounting seat 1 arranged at two sides of a chair back a in a mirror image manner, a handrail body 2 rotatably connected to the mounting seat 1, and a rotary positioning mechanism arranged between the handrail body 2 and the mounting seat 1; the rotary positioning mechanism comprises a fixed gear disc 3 arranged on the mounting seat 1 and a movable gear 4 correspondingly arranged on the handrail body 2; fixed teeth 5 arranged in a circular arc shape are arranged on the fixed gear disc 3, and a positioning groove 6 is formed between every two adjacent fixed teeth; the movable tooth piece 4 and the handrail body 2 keep synchronous rotation, the movable tooth piece 4 is provided with a movable tooth 7 which can be in tooth joint with the positioning groove 6, and the movable tooth piece 4 can elastically stretch and retract relative to the handrail body 2 along the radial direction of the fixed gear disc 3; therefore, the handrail body 2 can rotate anticlockwise and upwards, and in the rotating process, the fixed teeth 5 and the movable teeth 7 are mutually extruded to act on the movable teeth 4 to stretch and retract, so that the movable teeth 7 are sequentially in toothed fit with the positioning grooves 6 by taking the profile of the fixed teeth 5 as a path; therefore, the handrail body 2 has obvious gear feeling in the process of rotating anticlockwise upwards, the fixed teeth 5 incline towards the anticlockwise direction, the movable teeth 7 can only rotate anticlockwise relative to the fixed teeth 5, and the handrail body 2 can stay at the position for use under the action of the movable teeth 7 and the fixed teeth 5 after being adjusted to rotate upwards; thereby can adjust the angle and the height of handrail body 2 simultaneously, it is convenient to adjust, and the result of use is better.

As shown in fig. 1-4, the mounting seat 1 protrudes outward from the chair back a, the cross section of the mounting seat 1 is circular, a rotating shaft 8 is arranged at the center of the mounting seat 1, and the diameter of the rotating shaft 8 is smaller than that of the mounting seat 1; a circular rotating shaft sleeve 9 is correspondingly arranged at the root part of the handrail body 2, a shaft hole 10 is arranged at the center of the rotating shaft sleeve 9, and the rotating shaft 8 penetrates through the shaft hole 10; be equipped with the mounting groove 11 that is used for holding fixed fluted disc 3 on the one side of the back of the chair A of axle sleeve 9 that rotates, fixed fluted disc 3 is a disc, and fixed fluted disc 3 is located this mounting groove 11, and fixed fluted disc 3 and pivot 8 fixed connection, decide the outside edge department of tooth 5 setting in the preceding upper end of fixed fluted disc 3, the diameter of fixed fluted disc 3 will be greater than the diameter of shaft hole 10 for fixed fluted disc 3 both can act on the rotation regulation of handrail body 2, can also play the effect of fixed handrail 2 body. In addition, as shown in fig. 8, a limiting mechanism is further arranged between the armrest body 2 and the mounting seat 1, and the limiting mechanism comprises a limiting groove 24 arranged on the mounting seat 1 and a limiting block 25 correspondingly arranged on the rotating shaft sleeve 9; the limiting block 25 and the limiting groove 24 can effectively limit the rotation angle of the handrail body 2 and further disperse the stress; avoid the damage of the rotary positioning mechanism caused by excessive force application during operation.

As shown in fig. 3 to 7, the movable tooth 4 is a rectangular plate-shaped structure, and the movable tooth 4 is slidably fitted on the armrest body 2, and the specific connection structure is as follows: the handrail body 2 is provided with a sliding chute 12, the movable tooth part 4 is in sliding fit with the sliding chute 12, a convex connecting column 13 is arranged in the sliding chute 12, a guide hole 14 is correspondingly arranged on the movable tooth part 4, the connecting column 13 is arranged on the guide hole 14 in a penetrating way, the movable tooth part 3 is also connected with a pressing plate 15, and the pressing plate 15 is connected and fixed on the connecting column 13, so that the movable tooth part 4 is limited in the handrail body 2, and the movable tooth part 4 can stably slide in the sliding chute 12; the movable teeth 7 are arranged at one end, close to the root part of the handrail body 2, of the movable teeth 4, the movable teeth 4 slide backwards along the sliding grooves 12, so that the fixed teeth 7 can be in tooth joint fit with the fixed teeth 5, and the sliding direction of the movable teeth 4 is just the radial direction of the fixed gear disc 3; a spring 16 is arranged between the other end (front end) of the movable tooth 4 and the handrail body 2, a clamping plate 26 is arranged at the front end of the movable tooth 4, one end of the spring 16 is clamped on the clamping plate 26, and the other end of the spring 16 is abutted against the inside of the handrail body 2; during the anticlockwise rotation of the handrail body 2, the spring 16 elastically compresses and provides elastic force to enable the movable tooth element 4 to always have the tendency of extending backwards to enable the movable tooth 7 to be in tooth joint fit with the fixed tooth 5.

As shown in fig. 5 and 6, the usage status and the adjustment process of the armrest body 2 are as follows: as shown in fig. 5, when the handrail main body 2 is normally used, the movable teeth 7 are engaged with the fixed teeth 5, the handrail main body 2 is applied with a downward force by a user, so that the movable teeth 7 tend to rotate clockwise relative to the fixed teeth 5, but since the fixed teeth 5 are inclined in a counterclockwise direction, the movable teeth 7 are engaged and fixed with the fixed teeth 5; the movable tooth part 4 is subjected to a limiting force along the tangential direction of the fixed gear disc 3, so that the movable tooth part 4 cannot slide, and the handrail body 2 can stably stay at the use position and support the arm of a user; as shown in fig. 6, when the handrail body 2 needs to be raised, the handrail body 2 is controlled to rotate anticlockwise, at this time, the movable teeth 7 can move along the oblique direction of the fixed teeth 5, meanwhile, the fixed teeth 5 act on the movable teeth 4 to shrink in an extrusion manner, and when the movable teeth 5 rotate to the next positioning groove 6, the movable teeth 4 automatically bounce again to enable the movable teeth 5 to be in tooth connection with the positioning groove 6; the movable teeth 7 can rotate along the profile of the fixed teeth 5 and are sequentially clamped with the positioning grooves 6 on the fixed teeth 5; therefore, the handrail body 2 has obvious gear feeling and a plurality of adjusting positions in the upward rotating and lifting process, and the adjusting range is wider; in addition, the user only needs to act on the handrail body 2 to rotate, the movable tooth piece 4 can automatically stretch and retract, the design is ingenious, and the operation is labor-saving.

Further, the following steps are carried out: as shown in fig. 3-8, since the movable teeth 7 can only rotate counterclockwise relative to the fixed teeth 5, when the armrest body 2 is rotated to the highest position, the armrest body 2 needs to be rotated clockwise to be reset; therefore, a rotation resetting mechanism is also arranged, the rotation resetting mechanism comprises a locking piece 17 which is rotatably arranged in the handrail body 2, the locking piece 17 is arranged on one side of the movable tooth piece 4 close to the lower part, a locking block 18 is arranged on the locking piece 17, a locking groove 19 is correspondingly arranged on the side edge of the movable tooth piece 4, and the locking block 18 can be clamped in the locking groove 19. The locking member 17 includes a rotating pin 20 rotatably disposed in the armrest body 2, and as shown in fig. 4, a torsion spring 21 is sleeved on the rotating pin 20, and the torsion spring 21 is configured to make the locking member 17 always have a tendency of rotating to make the locking block 18 be locked in the locking groove 19; as shown in fig. 5 and 6, when the moving tooth 7 is engaged with the fixed tooth 5 or the moving tooth 7 is not completely disengaged from the fixed tooth 5, the locking piece 18 is misaligned with the locking groove 19, and the locking piece 18 is overlapped on the side edge of the movable tooth member 4. As shown in fig. 7, the upper end of the fixed tooth 5 has a locking end 22, the lower end of the fixed tooth 5 has a resetting end 23, and the diameter of the fixed tooth disk 3 at the locking end 22 is larger than the diameter of the addendum circle of the fixed tooth 5; when the handrail body 2 rotates upwards to the highest position, the fixed teeth 5 abut against the locking end 22, at the moment, the movable tooth piece 4 contracts to the maximum degree, the locking piece 17 automatically rotates to enable the locking block 18 to be just clamped in the locking groove 19, so that the movable tooth piece 4 and the handrail body 2 are relatively fixed, and at the position, the movable teeth 7 are completely separated from the fixed teeth 5 and have a gap; then the armrest body 2 can be rotated clockwise and downwards to be reset. The locking piece 17 is provided with an abutting part 17b close to the root part of the handrail body 2 and a locking part 17a for locking the movable tooth joint 4, the locking piece 18 is arranged on the locking part 17a, as shown in fig. 2, when the handrail body 2 is reset to the initial lowest position, the abutting part 17b abuts against the reset end 23 and the locking piece and the reset end are mutually pressed, so that the locking piece 17 reversely rotates and drives the locking piece 18 to be separated from the locking groove 19, and the movable tooth piece 4 is re-ejected under the action of the spring 16 to enable the movable tooth 7 to be in tooth joint with the fixed tooth 5.

In conclusion, the handrail rotation adjusting device of the utility model can correspondingly adjust the height of the handrail body 2 by controlling the handrail body 2 to rotate; the angle and the height of the handrail body 2 can be controlled simultaneously, so that the adjustment is more natural; moreover, the rotation and reset operations of the handrail body 2 are very easy and labor-saving, and the use is more convenient; compare with the handrail structure of traditional over-and-under type, area occupied is littleer undoubtedly, and the structure is more ingenious, and it is more convenient to operate.

The present invention and its embodiments have been described above schematically, and the description is not limited thereto, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching of the present invention, without departing from the inventive spirit of the present invention, the person skilled in the art should also design the similar structural modes and embodiments without creativity to the technical solution, and all shall fall within the protection scope of the present invention.

Claims

1. The utility model provides a handrail rotates adjusting device which characterized in that: the armrest comprises an installation seat arranged on a seat, an armrest body rotationally connected to the installation seat, and a rotary positioning mechanism arranged between the armrest body and the installation seat; the rotary positioning mechanism comprises a fixed gear disc arranged on the mounting seat and movable gear pieces correspondingly arranged on the handrail body; fixed teeth which are arranged in a circular arc shape are arranged on the fixed tooth disc, the fixed teeth incline towards the anticlockwise direction, and a positioning groove is formed between every two adjacent fixed teeth; the movable tooth piece and the handrail body keep synchronous rotation, the movable tooth piece is provided with movable teeth capable of being in tooth connection with the positioning groove, and the movable tooth piece can elastically stretch along the radial direction of the fixed gear disc; in the process that the handrail body rotates anticlockwise and upwards, the fixed teeth continuously extrude and act on the movable tooth piece to stretch, so that the movable teeth are sequentially matched with the positioning grooves in a tooth joint mode by taking the profiles of the fixed teeth as paths; the handrail turning device is characterized by further comprising a turning reset mechanism, wherein the turning reset mechanism comprises a locking piece which is rotationally arranged on the handrail body and a locking groove which is arranged on the movable tooth piece, and a locking block which can be clamped into the locking groove is arranged on the locking piece; the upper end of the fixed tooth is provided with a locking end, and the lower end of the fixed tooth is provided with a resetting end; when the movable teeth rotate to the locking end, the movable tooth piece contracts to the maximum, the locking piece rotates and enables the locking block to be clamped into the locking groove, so that the movable tooth piece and the handrail body are relatively fixed, the movable teeth are completely separated from the fixed teeth, and the handrail body can rotate clockwise to reset; when the handrail body resets to the locking piece and resets and hold the butt, the end extrusion locking piece that resets makes locking piece antiport and drives the locking piece and break away from the locked groove, and movable tooth spare stretches out once more and makes and move tooth and decide tooth meshing.

2. The armrest rotation adjustment device of claim 1, wherein: the movable tooth piece is in a strip shape, a sliding groove is arranged on the handrail body, and the movable tooth piece is in sliding fit in the sliding groove; a spring is arranged between the movable tooth piece and the handrail body, and the spring enables the movable tooth to always have the tendency of being in tooth joint fit with the fixed tooth.

3. The armrest rotation adjustment device of claim 1, wherein: the locking member is provided on one side of the movable gear, and has a locking portion and an abutting portion; the locking piece is arranged on the locking part; when the handrail body rotates and resets, the butt joint part and the end that resets extrude each other so as to order about the locking piece and rotate.

4. The armrest rotation adjustment device of claim 3, wherein: the locking piece is provided with a rotating pin which is in rotating fit with the handrail body; and a torsional spring is arranged on the rotating shaft, and under the action of the torsional spring, the locking piece always has the tendency of rotating to enable the locking block to be clamped into the locking groove.

5. The armrest rotation adjustment device of claim 1, wherein: the fixed gear disc is a circular disc, and the fixed teeth are arranged on the outer edge of the front upper end of the fixed gear disc.

6. The armrest rotation adjustment device of claim 1, wherein: the diameter of the fixed gear disc at the locking end is larger than the diameter of the addendum circle of the fixed gear.

7. The armrest rotation adjustment device of claim 1, wherein: when the movable teeth are in tooth joint fit with the fixed teeth or the movable teeth are not completely separated from the fixed teeth, the positions of the locking block and the locking groove are staggered.

8. The armrest rotation adjustment device of claim 1, wherein: the installation seat is provided with a rotating shaft, the root of the handrail body is provided with a rotating shaft sleeve, and the rotating shaft sleeve is rotatably sleeved on the rotating shaft; and one side of the rotating shaft sleeve, which is far away from the mounting seat, is also provided with a mounting groove for accommodating a fixed gear disc, and the fixed gear disc is positioned in the mounting groove and is fixedly connected with the rotating shaft.

9. The armrest rotation adjustment device of claim 8, wherein: and a limiting mechanism is also arranged between the mounting seat and the rotating shaft sleeve and comprises a limiting groove arranged on one of the mounting seat or the rotating shaft sleeve and a limiting block arranged on the other of the mounting seat or the rotating shaft sleeve.

10. The armrest rotation adjustment device of claim 1, wherein: the maximum angle of the handrail body which rotates anticlockwise from the lowest height is between 30 and 50 degrees.

11. A seat, characterized by: comprising an armrest turning adjustment device as claimed in any of claims 1-10.