CN219515759U - Self-circulation lifting structure handrail - Google Patents

Abstract

The utility model discloses a self-circulation lifting structure handrail, which comprises a base, a lifting sleeve and a supporting piece, wherein the supporting piece is configured to support a human arm and is arranged on the lifting sleeve; the self-circulation lifting of the lifting sleeve and the base is realized through the self-circulation gear component between the lifting sleeve and the sleeving part; and because the clamping piece of the self-circulation gear component is in one-way clamping connection with the rack, the support stability can be ensured while the self-circulation lifting without a switch is realized.

Description

Self-circulation lifting structure handrail

Technical Field

The utility model relates to the field of furniture, in particular to a self-circulation lifting structure handrail.

Background

In order to improve the comfort of the seat, the existing seat is generally provided with armrests so as to support the arms of a user and improve the sitting comfort. Generally, existing armrests of seats are mainly divided into a fixed armrest and a movable armrest, the fixed armrest is fixedly arranged on the seat to provide an arm supporting function, and the movable armrest can adjust the position and the posture of the armrest relative to the seat, so that the arms of a human body can be supported under different human body postures.

The movable armrests are of various types, the movable armrests are more commonly provided with a rotating armrest with a rotating function and an armrest with a lifting function, the lifting armrest can be adjusted in the height direction, people with different heights can be adjusted to the comfortable height of the movable armrests, or the movable armrests can be lowered to relax shoulders during rest, and the movable armrests can be raised during office work so that arms resting on a desk can be supported by the armrests at higher positions, so that the movable armrests can adapt to users with different heights and different application scenes; the existing lifting handrails generally have two types, one is a friction locking lifting handrail, the supporting performance is difficult to ensure, and the other is a lifting handrail which is locked by a structure controlled by a switch, and the lifting handrail needs to press the switch to adjust the height no matter lifting; and none of the armrests can ensure the supporting stability and realize self-circulation lifting.

Disclosure of Invention

In order to solve the technical problems, the utility model provides a self-circulation lifting structure handrail, which comprises a base, a lifting sleeve and a supporting piece, wherein the supporting piece is configured to support a human arm and is arranged on the lifting sleeve; the self-circulation lifting of the lifting sleeve and the base is realized through the self-circulation gear component between the lifting sleeve and the sleeving part; and because the clamping piece of the self-circulation gear component is in one-way clamping connection with the rack, the support stability can be ensured while the self-circulation lifting without a switch is realized.

The technical scheme of the utility model is realized as follows:

the self-circulation lifting structure handrail comprises a base, a lifting sleeve and a supporting piece, wherein the base is configured to be connected with a seat, the base comprises a connecting part and a sleeving part, the sleeving part is vertically arranged, the lifting sleeve is sleeved on the sleeving part, and the lifting sleeve selectively lifts and slides on the sleeving part; a self-circulation gear assembly for maintaining the relative position of the lifting sleeve and the sleeving part after lifting is arranged between the lifting sleeve and the sleeving part, wherein the self-circulation gear assembly comprises a rack and a clamping piece with a switchable state, the rack or the clamping piece is arranged at the sleeving part and is relatively fixed with the base, and the other one is relatively fixed with the lifting sleeve; the rack comprises a multi-tooth section which is in one-way clamping with the clamping piece, a locking part which enables the clamping piece to be separated from the multi-tooth section, and a return part which enables the clamping piece to be clamped with the multi-tooth section again, and the multi-tooth section is provided with a plurality of clamping grooves; when the lifting sleeve ascends relative to the sleeving part, the clamping piece moves on the multi-tooth section and is switched between the clamping grooves from bottom to top or from top to bottom, the clamping piece breaks away from the multi-tooth section after passing through the locking part, and the lifting sleeve can descend relative to the sleeving part; after the clamping piece reaches the return part, the clamping piece is clamped with the clamping tooth section again; the bearing piece is configured to bear the arm of the human body, is arranged on the lifting sleeve and lifts along with the lifting sleeve.

The lifting sleeve and the base are lifted relatively to realize the lifting of the handrail, but the self-circulation gear component between the lifting sleeve and the sleeving part can realize the lifting and can provide support stability, and the clamping piece of the self-circulation unit component is in one-way clamping with the rack, so that the self-circulation lifting without a switch can be realized, and the support stability in the process of supporting the arm of a human body can be ensured; the unidirectional clamping means that when the lifting sleeve ascends relative to the sleeving part, the clamping piece can smoothly move on the multi-tooth section without locking, but when the lifting sleeve has a descending trend or receives downward pressure, the clamping piece is clamped with the multi-tooth section, so that the lifting sleeve is prevented from descending, and arm support is realized.

Preferably, the rack is arranged on the sleeving part and is relatively fixed with the sleeving part, and the clamping piece is arranged on the lifting sleeve and is lifted synchronously with the lifting sleeve; the sleeving part is provided with a chute, and the rack is vertically arranged in the chute; the clamping piece is connected with the lifting sleeve through the sliding seat, the sliding seat is arranged in the sliding groove and slides relative to the sliding groove, the sliding seat is vertically arranged, and the clamping piece is perpendicular to the sliding seat. The lifting sleeve and the sleeving part are mutually sleeved and relatively lifted, and the clamping piece and the rack also need to relatively lift, so that a sliding groove is formed in the sleeving part to enable the clamping piece and the rack to have a space for installation and lifting, the clamping piece is connected to the lifting sleeve through the sliding seat, and the sliding seat can be just lifted and arranged in the sliding groove.

Preferably, the locking part, the multi-tooth section and the return part are integrally formed and are sequentially arranged from top to bottom; the end of the return part is extended downwards to form a convex plug, the bottom surface of the sliding groove is correspondingly provided with a slot, and the plug is inserted into the slot. The rack is an integral part, and according to the arrangement of the locking part, the multi-tooth section and the return part, however, the movement of the clamping piece is configured to reach the locking part after the multi-tooth section rises to the highest, the clamping piece is continuously lifted to be locked in a state of being separated from the multi-tooth section under the action of the locking part, at the moment, the clamping piece can be lifted to the position of the return part after passing through the multi-tooth section, and can be clamped with the multi-tooth section again after the action of the return part, so that the self-circulation lifting is realized; the same is true for the self-circulating lifting mode that reacts to the lifting sleeve.

Preferably, the plug is wedge-shaped, and the shape of the slot corresponds to the plug; two sides of the locking part positioned at the upper part of the rack are convexly provided with vertical limiting blocks, the side wall of the chute is correspondingly provided with limiting guide grooves extending along the vertical direction, and when the rack is arranged in the chute, the limiting blocks are inserted into the limiting guide grooves from top to bottom; the rack is provided with an elastic buckle, the side wall of the chute is correspondingly provided with a clamping hole, the elastic buckle is clamped in the clamping hole, and the elastic buckle is positioned at the locking part and protrudes out of the locking part towards the rear. Because the plug is wedge-shaped, the plug is easier to insert into the slot, and the rack is easier to accurately install into the chute; the limiting block is inserted into the limiting guide groove from top to bottom so as to limit the rack in the front-rear direction; the elastic buckle is clamped into the clamping hole so as to prevent the rack from falling out of the chute; through plug and slot, stopper and spacing guide slot and elasticity buckle and draw-in hole, make the rack install in the spout accurately, and all by spacing locking in fore-and-aft direction, upper and lower direction and left and right directions.

Preferably, the sliding seat comprises a mounting part, wherein the mounting part is wedge-shaped, and the mounting part is upwards exposed out of the sliding groove and is inserted into the lifting sleeve; screw holes which are penetrated left and right are formed in the mounting part, and the mounting part is connected with the lifting sleeve through screws. The sliding seat is installed with the lifting sleeve through the installation part.

Preferably, the length of the mounting part in the front-rear direction is greater than that of the sliding seat, a first mounting hole penetrating up and down is formed in the mounting part, the first mounting hole is located beside the sliding seat, the rack is provided with a first inserting column protruding upwards, and the first inserting column is inserted into the first mounting hole from bottom to top. And when the lifting sleeve and the sleeving part lift, the first inserting column and the first mounting hole can be separated.

Preferably, the mounting part is further provided with a second mounting hole which is vertically arranged, the second mounting hole is positioned beside the first mounting hole and above the sliding seat, two second inserting columns are correspondingly and convexly arranged in the lifting sleeve, and the two second inserting columns are respectively inserted into the first mounting hole and the second mounting hole from top to bottom. Thereby positioning the sliding seat.

Preferably, the lifting sleeve is also provided with a decorative cover for shielding the screw. The decorative cover and the lifting sleeve are also connected with the clamping groove in a clamping way through a clamping buckle.

Preferably, the sliding seat is provided with a convex strip protruding out of the surface of the sliding seat. The convex strips reduce the contact area between the sliding seat and the chute wall, thereby reducing the friction force.

The design starting point, the idea and the beneficial effects of the utility model adopting the technical scheme are as follows:

the lifting sleeve and the base are lifted relatively to realize the lifting of the handrail, but the self-circulation gear component between the lifting sleeve and the sleeving part can realize the lifting and can provide support stability, and the clamping piece of the self-circulation unit component is in one-way clamping with the rack, so that the self-circulation lifting without a switch can be realized, and the support stability in the process of supporting the arm of a human body can be ensured; the unidirectional clamping means that when the lifting sleeve ascends relative to the sleeving part, the clamping piece can smoothly move on the multi-tooth section without locking, but when the lifting sleeve has a descending trend or receives downward pressure, the clamping piece is clamped with the multi-tooth section, so that the lifting sleeve is prevented from descending, and arm support is realized.

Drawings

FIG. 1 is a schematic perspective view of the handrail according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram showing a perspective view of the handrail according to the second embodiment of the present utility model;

FIG. 3 is a schematic perspective view of the lifting sleeve in an embodiment of the utility model after being lifted on the base;

FIG. 4 is a schematic perspective view of a lifting sleeve according to an embodiment of the present utility model;

FIG. 5 is a schematic diagram showing a second perspective structure of a lifting sleeve according to an embodiment of the present utility model;

FIG. 6 is a cross-sectional view of a lifting sleeve in an embodiment of the utility model;

FIG. 7 is a schematic perspective view of a base according to an embodiment of the present utility model;

FIG. 8 is a schematic diagram showing a second perspective structure of a base according to an embodiment of the present utility model;

FIG. 9 is a cross-sectional view of a base in an embodiment of the utility model;

FIG. 10 is a schematic perspective view of a self-circulating gear assembly according to an embodiment of the present utility model;

FIG. 11 is a schematic diagram showing a second perspective view of a self-circulating gear assembly according to an embodiment of the present utility model;

FIG. 12 is a cross-sectional view of a self-cycling gear assembly in an embodiment of the present utility model;

fig. 13 is an exploded view of the armrest (without the support) in an embodiment of the utility model.

The reference numerals are as follows: a base 1; a connection part 101; a socket 102; a lifting sleeve 2; a support 3; a rack 4; a clamping piece 5; a multi-tooth segment 6; a locking part 7; a rising slope 71; a stop surface 72; a rotating slide surface 73; a return section 8; a clamping groove 9; a limiting surface 91; a sliding surface 92; a chute 10; a slide seat 11; a plug 12; a slot 13; a stopper 14; a limit guide groove 15; an elastic buckle 16; a card hole 17; a mounting portion 18; a screw hole 19; a decorative cover 20; a first mounting hole 21; a first post 22; a second mounting hole 23; a second post 24; a catch 25; a rotation shaft 26; a stopper 27; a main body 271; a stopper 272; a spring 28; a rotary groove 29; a limit groove 30; latch 31; the ribs 32.

Detailed Description

In order that the above-recited objects, features and advantages of the present utility model will be more clearly understood, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, without conflict, the embodiments of the present utility model and features in the embodiments may be combined with each other.

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

In the description of the present utility model, 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.

The specific embodiments of the present utility model are as follows:

as shown in fig. 1-3 and 13, the utility model provides a self-circulation lifting structure handrail, which comprises a base 1, a lifting sleeve 2 and a supporting piece 3, wherein the base 1 is configured to be connected with a seat, the base 1 comprises a connecting part 101 and a sleeving part 102, the sleeving part 102 is vertically arranged, the lifting sleeve 2 is sleeved on the sleeving part 102, and the lifting sleeve 2 selectively lifts and slides on the sleeving part 102; a self-circulation gear assembly for keeping the relative position of the lifting sleeve 2 and the sleeving part 102 after lifting is arranged between the lifting sleeve 2 and the sleeving part 102, wherein the self-circulation gear assembly comprises a rack 4 and a clamping piece 5 with a switchable state, the rack 4 or the clamping piece 5 is arranged at the sleeving part 102 and is kept relatively fixed with the base 1, and the other one is kept relatively fixed with the lifting sleeve 2; the rack 4 comprises a multi-tooth section 6 which is in one-way clamping with the clamping piece 5, a locking part 7 which enables the clamping piece 5 to be separated from the multi-tooth section 6, and a return part 8 which enables the clamping piece 5 to be clamped with the multi-tooth section 6 again, wherein the multi-tooth section 6 is provided with a plurality of clamping grooves 9; when the lifting sleeve 2 ascends relative to the sleeving part 102, the clamping piece 5 moves on the multi-tooth section 6 and is switched between the clamping grooves 9 from bottom to top or from top to bottom, the clamping piece 5 breaks away from the multi-tooth section 6 after passing through the locking part 7, and the lifting sleeve 2 can descend relative to the sleeving part 102; after the clamping piece 5 arrives at the return part 8, the clamping piece 5 is clamped with the section 31 of the clamping tooth again; the supporting piece 3 is configured to support the arm of the human body, and the supporting piece 3 is arranged on the lifting sleeve 2 and lifts together with the lifting sleeve 2.

The lifting sleeve 2 and the base 1 are lifted relatively to realize the lifting of the handrail, but the self-circulation gear assembly between the lifting sleeve 2 and the sleeving part 102 can realize the lifting and can provide support stability, and the clamping piece 5 of the self-circulation unit assembly is in one-way clamping with the rack 4, so that the self-circulation lifting without a switch can be realized, and the support stability when the arm of a human body is supported can be ensured; the unidirectional clamping means that when the lifting sleeve 2 ascends relative to the sleeving part 102, the clamping piece 5 can smoothly move on the multi-tooth section 6 without locking, but when the lifting sleeve 2 has a descending trend or receives downward pressure, the clamping piece 5 is clamped with the multi-tooth section 6, so that the lifting sleeve 2 is prevented from descending, and arm support is realized; the state switching of the engaging member 5 is to be switched between a state where the engaging member cannot engage with the multi-tooth segment 6 by the action of the locking portion 7 and a state where the engaging member can engage with the multi-tooth segment 6 again by the action of the return portion 8.

Specifically, as shown in fig. 4-9 and 13, the rack 4 is disposed on the sleeve joint 102 and is fixed relative to the sleeve joint 102, and the clamping piece 5 is disposed on the lifting sleeve 2 and is fixed relative to the lifting sleeve 2; the sleeving part 102 is provided with a chute 10, and the rack 4 is vertically arranged in the chute 10; the clamping piece 5 is connected with the lifting sleeve 2 through a sliding seat 11, the sliding seat 11 is arranged in the sliding groove 10 and slides relative to the sliding groove 10, the sliding seat 11 is vertically arranged, and the clamping piece 5 is vertical to the sliding seat 11; the lifting sleeve 2 and the sleeving part 102 are sleeved with each other and relatively lifted, and the clamping piece 5 and the rack 4 also need to relatively lift, so that the sleeving part 102 is provided with the sliding groove 10 to enable the clamping piece 5 and the rack 4 to have a space for installation and lifting, the clamping piece 5 is connected to the lifting sleeve 2 through the sliding seat 11, and the sliding seat 11 can be just lifted and arranged in the sliding groove 10.

As shown in fig. 10-13, the locking part 7, the multi-tooth segment 6 and the return part 8 are integrally formed and are sequentially arranged from top to bottom; the end part of the return part 8 is extended downwards to form a convex plug 12, the bottom surface of the chute 10 is correspondingly provided with a slot 13, and the plug 12 is inserted into the slot 13; the rack 4 is an integral part, and according to the arrangement of the locking part 7, the multi-tooth section 6 and the return part 8, however, the movement of the clamping piece 5 is configured to reach the locking part 7 after rising to the highest position on the multi-tooth section 6, the locking part 7 is acted by the locking part 7 to lock the clamping piece 5 in a state of being separated from the multi-tooth section 6, at the moment, the clamping piece 5 can go down from the multi-tooth section 6 to the return part 8, and can be clamped with the multi-tooth section 6 again after being acted by the return part 8, so that self-circulation lifting is realized; the same is true for the self-circulating lifting mode of reaction onto the lifting jacket 2.

As shown in fig. 7, 9, 10 and 11, the plug 12 is wedge-shaped, the shape of the slot 13 corresponds to that of the plug 12, and the plug 12 is easier to insert into the slot 13 due to the wedge-shaped plug 12, so that the rack 4 is easier to accurately install into the chute 10; two sides of the locking part 7 positioned at the upper part of the rack 4 are convexly provided with vertical limiting blocks 14, the side wall of the chute 10 is correspondingly provided with limiting guide grooves 15 extending along the vertical direction, and when the rack 4 is arranged in the chute 10, the limiting blocks 14 are inserted into the limiting guide grooves 15 from top to bottom so as to limit the rack 4 in the front-back direction; the rack 4 is provided with an elastic buckle 16, the side wall of the chute 10 is correspondingly provided with a clamping hole 17, the elastic buckle 16 is clamped into the clamping hole 17 to prevent the rack 4 from falling out of the chute 10, and the elastic buckle 16 is positioned at the locking part 7 and protrudes towards the rear side to the locking part 7; through plug 12 and slot 13, stopper 14 and spacing guide slot 15 and elasticity buckle 16 and card hole 17, make rack 4 accurate install in spout 10, and all by spacing locking in fore-and-aft direction, upper and lower direction and left and right directions.

As shown in fig. 10 to 13, the sliding seat 11 includes a mounting portion 18, the mounting portion 18 is wedge-shaped, and the mounting portion 18 is exposed upward from the chute 10 and is inserted into the lifting sleeve 2; the mounting part 18 is provided with a screw hole 19 which is penetrated left and right, and the mounting part 18 is connected with the lifting sleeve 2 through a screw; the lifting sleeve 2 is also provided with a decorative cover 20 for shielding the screw, and the decorative cover 20 is also clamped with the lifting sleeve 2 through a buckle and a clamping hole; the length of the mounting part 18 in the front-rear direction is greater than that of the sliding seat 11, a first mounting hole 21 which is vertically penetrated is formed in the mounting part 18, the first mounting hole 21 is positioned beside the sliding seat 11, the rack 4 is provided with a first inserting column 22 which protrudes upwards, the first inserting column 22 is inserted into the first mounting hole 21 from bottom to top, and when the lifting sleeve 2 and the sleeving part 102 are lifted, the first inserting column 22 can be separated from the first mounting hole 21; the mounting part 18 is also provided with a second mounting hole 23 which is vertically arranged, the second mounting hole 23 is positioned beside the first mounting hole 21 and above the sliding seat 11, two second inserting posts 24 are correspondingly and convexly arranged in the lifting sleeve 2, and the two second inserting posts 24 are respectively inserted into the first mounting hole 21 and the second mounting hole 23 from top to bottom so as to position the sliding seat 11; the sliding seat 11 is provided with a convex strip 32 protruding out of the surface of the sliding seat 11; the raised strips 32 reduce the contact area between the sliding seat 11 and the wall of the chute 10, thereby reducing friction.

The clamping piece 5 comprises a clamping tongue 25, a rotating shaft 26 and a limiting piece 27, wherein the clamping tongue 25 is clamped with the clamping groove 9, the clamping tongue 25 is fixedly connected with one end of the rotating shaft 26, the limiting piece 27 is connected with the other end of the rotating shaft 26 through a screw, and the clamping tongue 25 and the limiting piece 27 are in relative rotation connection with the sliding seat 11 through the rotating shaft 26; the rotating shaft 26 is provided with an elastic piece, the elastic piece is a spring 28, the spring 28 is sleeved on the rotating shaft 26, and two ends of the spring 28 respectively lean against the clamping tongue 25 and the sliding seat 11, so that the elastic force of the movement of the clamping tongue 25 towards the rack 4 is provided; the limiting member 27 includes a disc-shaped main body portion 271 and a limiting portion 272 protruding from the main body portion 271 in a radial direction, correspondingly, a rotating groove 29 for accommodating the main body portion 271 is formed in the sliding seat 11, a limiting groove 30 for accommodating the limiting portion 272 is further formed beside the rotating groove 29, the limiting groove 30 is an arc-shaped groove and is used for limiting rotation of the clamping member 5 with the limiting portion 272 through limiting rotation of the clamping member 5, namely, a specific structure and a movement mode are disclosed in a patent with a patent application number of CN202210628523.5, and are not repeated herein.

The clamping tongue 25 is a triangular column body and is arranged along the horizontal direction; the multi-tooth section 6 comprises a plurality of clamping teeth 31, the plurality of clamping teeth 31 are arranged along the vertical direction, and the clamping groove 9 is formed between two adjacent clamping teeth 31; the clamping tongue 25 is also provided with a plurality of clamping teeth 31, clamping grooves 9 are also formed between the clamping teeth 31, and the clamping tongue 25 is mutually clamped and matched with the clamping tongue 25 and the clamping grooves 9 on the multi-tooth section 6; the spacing between adjacent latches 31 is configured to reduce the distance of single sliding of the lifting sleeve 2 on the base 1 so as to be approximately stepless in adjustment; the tooth height of the latch 31 is configured to reduce the lifting and falling distance of the latch 25 when switching between the clamping grooves 9, so as to achieve the noise reduction and silence effects; however, the tooth shape of the latch 31 is reduced, the strength of the latch is also reduced, and the support stability of the latch 25 after being clamped with the multi-tooth section 6 is poor, so that a plurality of latches 31 are also arranged on the latch 25 to increase the contact area after being clamped, thereby improving the support stability; the clamping groove 9 is provided with a limiting surface 91 and a sliding surface 92, and the sliding direction of the lifting sleeve 2 is vertical, so that the limiting surface 91 is horizontal, the sliding surface 92 is inclined, and when the lifting sleeve 2 slides on the base 1, the clamping tongue 25 slides on the sliding surface 92; when the lifting sleeve 2 and the base 1 are relatively static, the limiting surface 91 is abutted with the clamping tongue 25 to provide support.

The locking part 7 comprises a rising inclined surface 71, a stopping surface 72 and a rotating sliding surface 73, wherein the rising inclined surface 71 is positioned above the stopping surface 72 and the rotating sliding surface 73, the rotating sliding surface 73 is vertically arranged, and the stopping surface 72 is positioned beside the rotating sliding surface 73; specific structures and movement patterns are disclosed in the patent application CN202210628523.5, and are not described in detail herein.

When in installation, the spring 28 is sleeved on the clamping piece 5 and is installed on the sliding seat 11 together, then the limiting piece 27 is connected with the rotating shaft 26 through a screw, and the rack 4 is connected with the sliding seat 11 through the first inserting column 22 and the first installation hole 21, so that the clamping piece 5, the sliding seat 11 and the rack 4 form a whole, namely a self-circulation gear assembly; the self-circulation gear assembly is then installed in the chute 10 of the socket 102, and finally the lifting sleeve 2 with the support 3 is installed.

Claims (9)

1. The utility model provides a self-loopa elevation structure handrail which characterized in that: the seat comprises a base, a lifting sleeve and a supporting piece, wherein the base is configured to be connected with a seat, the base comprises a connecting part and a sleeving part, the sleeving part is vertically arranged, the lifting sleeve is sleeved on the sleeving part, and the lifting sleeve selectively lifts and slides on the sleeving part; a self-circulation gear assembly for maintaining the relative position of the lifting sleeve and the sleeving part after lifting is arranged between the lifting sleeve and the sleeving part, wherein the self-circulation gear assembly comprises a rack and a clamping piece with a switchable state, the rack or the clamping piece is arranged at the sleeving part and is relatively fixed with the base, and the other one is relatively fixed with the lifting sleeve; the rack comprises a multi-tooth section which is in one-way clamping with the clamping piece, a locking part which enables the clamping piece to be separated from the multi-tooth section, and a return part which enables the clamping piece to be clamped with the multi-tooth section again, and the multi-tooth section is provided with a plurality of clamping grooves; when the lifting sleeve ascends relative to the sleeving part, the clamping piece moves on the multi-tooth section and is switched between the clamping grooves from bottom to top or from top to bottom, the clamping piece breaks away from the multi-tooth section after passing through the locking part, and the lifting sleeve can descend relative to the sleeving part; after the clamping piece reaches the return part, the clamping piece is clamped with the clamping tooth section again; the bearing piece is configured to bear the arm of the human body, is arranged on the lifting sleeve and lifts along with the lifting sleeve.

2. The self-circulating lifting structure handrail of claim 1, wherein: the rack is arranged on the sleeving part and is fixed relative to the sleeving part, and the clamping piece is arranged on the lifting sleeve and is lifted synchronously with the lifting sleeve; the sleeving part is provided with a chute, and the rack is vertically arranged in the chute; the clamping piece is connected with the lifting sleeve through the sliding seat, the sliding seat is arranged in the sliding groove and slides relative to the sliding groove, the sliding seat is vertically arranged, and the clamping piece is perpendicular to the sliding seat.

3. The self-circulating lifting structure handrail of claim 2, wherein: the locking part, the multi-tooth section and the return part are integrally formed and are sequentially arranged from top to bottom; the end of the return part is extended downwards to form a convex plug, the bottom surface of the sliding groove is correspondingly provided with a slot, and the plug is inserted into the slot.

4. A self-circulating lifting structure handrail as claimed in claim 3, wherein: the plug is wedge-shaped, and the shape of the slot corresponds to the plug; two sides of the locking part positioned at the upper part of the rack are convexly provided with vertical limiting blocks, the side wall of the chute is correspondingly provided with limiting guide grooves extending along the vertical direction, and when the rack is arranged in the chute, the limiting blocks are inserted into the limiting guide grooves from top to bottom; the rack is provided with an elastic buckle, the side wall of the chute is correspondingly provided with a clamping hole, the elastic buckle is clamped in the clamping hole, and the elastic buckle is positioned at the locking part and protrudes out of the locking part towards the rear.

5. The self-circulating lifting structure handrail of claim 2, wherein: the sliding seat comprises a mounting part, wherein the mounting part is wedge-shaped, and the mounting part is upwards exposed out of the sliding groove and is inserted into the lifting sleeve; screw holes which are penetrated left and right are formed in the mounting part, and the mounting part is connected with the lifting sleeve through screws.

6. The self-circulating lifting structure handrail of claim 5, wherein: the length of the installation part in the front-back direction is greater than the length of the sliding seat, a first installation hole which is vertically penetrated is formed in the installation part, the first installation hole is positioned beside the sliding seat, a rack is provided with a first inserting column which protrudes upwards, and the first inserting column is inserted into the first installation hole from bottom to top.

7. The self-circulating lifting structure handrail of claim 6, wherein: the second mounting hole of vertical setting has still been seted up on the installation department, and the second mounting hole is located first mounting hole side and is located the top of sliding seat, and the lift cover is interior to correspond protruding two second inserted posts that are equipped with, and two second inserted posts are inserted respectively in first mounting hole and second mounting hole from top to bottom.

8. The self-circulating lifting structure handrail of claim 5, wherein: the lifting sleeve is also provided with a decorative cover for shielding the screw.

9. The self-circulating lifting structure handrail of claim 2, wherein: the sliding seat is provided with a convex strip protruding out of the surface of the sliding seat.