CN220694835U - Waist rest adjusting mechanism - Google Patents

Abstract

The utility model discloses a lumbar support adjusting mechanism, which comprises a lumbar support and a lumbar support positioned in front of the lumbar support, and is characterized in that: at least one gas spring is connected between the lumbar support and the lumbar support, the gas spring comprises a cylinder barrel and a piston rod, the cylinder barrel is connected with one of the lumbar support or the lumbar support, and the piston rod is connected with the other of the lumbar support or the lumbar support; the head of the piston rod is provided with a switch which has an open state and a closed state, and in the open state, the piston rod is in a free telescopic state, and the lumbar support can be close to the lumbar support under the action of external force and reset when the external force disappears; in the closed state, the piston rod and the cylinder barrel are kept relatively fixed, and the lumbar rest stays at the corresponding position. The gas spring is used as a main component for realizing the function of the back and forth movement of the waist rest, is connected with the waist rest and the waist rest supporting piece at the same time, is adjusted back and forth through the telescopic movement of the piston rod, and has two states of being capable of being stressed and elastically telescopic and fixing the position.

Description

Waist rest adjusting mechanism

Technical Field

The utility model relates to the field of seats, in particular to a lumbar support adjusting mechanism.

Background

Along with the increase of working and learning time of modern people, people often need to sit on a seat for a long time, and sit still for a long time, so that the human spine is easy to generate serious injuries such as protrusion of intervertebral disc, displacement and the like to the human spine due to long-time compression of body weight. In order to meet the health requirements of people, a waist support effect is set up at the backrest of part of office chairs to support the natural bending position of lumbar vertebrae.

In order to adapt to the demands of different crowds, there are also seats on the market that can adjust the front and back positions of the lumbar support in many ways, for example, an internal thread adjusting lumbar support with publication number CN218605817U, including a support bracket and a lumbar support, wherein: the two opposite side ends of the bearing bracket are respectively provided with an adjusting structure, and one side of the adjusting structure is provided with the waist support; the adjusting structure specifically comprises: the utility model provides a support, including assembly section of thick bamboo, connecting axle, adjustment handle and spacing spool, be equipped with on the support assembly section of thick bamboo, the symmetry on the assembly section of thick bamboo one end that the waist held in the palm is equipped with the connecting axle, the other end of assembly section of thick bamboo is equipped with adjustment handle, during the use, the epaxial sliding arm of connecting is embedded in the location spout on the assembly section of thick bamboo to make the connecting axle can carry out the back-and-forth movement at the assembly section of thick bamboo, the tail end of sliding arm is inserted in the screw track in the adjustment handle in addition, when the adjustment handle takes place to rotate, the screw track will promote the sliding arm, thereby realizes controlling the connecting axle, and then adjusts the position that the waist held in the palm.

The waist rest structure of the chair adopts the mode of adjusting the internal threads, when the leaning force of a user is large, the waist rest drives the threads to reversely rotate to the original position, the fixing capability cannot be guaranteed, the waist rest is required to be frequently adjusted, the waist rest is fixed to be used after being adjusted to a required position, and the waist rest cannot automatically adjust along with the sitting posture requirement of the user, so that the handle or the knob for adjustment is required to be frequently rotated, and the waist rest is more troublesome, so that the waist rest adjusting mechanism is required to be correspondingly improved.

Disclosure of Invention

In order to solve the technical problems, the utility model aims to provide a lumbar support adjusting mechanism taking a gas spring as a main core component, wherein the gas spring is arranged on a lumbar support, one end of the gas spring is fixed on a lumbar support, the front and back adjusting functions of the lumbar support are achieved through the telescopic movement of a cylinder barrel and a piston rod in the gas spring, the gas spring is in two states which are adjusted by a switch, wherein the piston rod in one state can be in a freely telescopic open state, and the lumbar support can retract the cylinder barrel and the piston rod when the external force disappears; the other state is a closing state that the piston rod and the cylinder are relatively fixed, the waist rest is switched to the closing state after the position of the waist rest is adjusted, and the waist rest is relatively fixed relative to the waist rest supporting piece.

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

the utility model provides a lumbar support adjustment mechanism, includes lumbar support and is in lumbar support the place ahead of lumbar support, its characterized in that: at least one gas spring is connected between the lumbar support and the lumbar support, the gas spring comprises a cylinder barrel and a piston rod, the cylinder barrel is connected with one of the lumbar support or the lumbar support, and the piston rod is connected with the other of the lumbar support or the lumbar support; the head of the piston rod is provided with a switch which has an open state and a closed state, and in the open state, the piston rod is in a free telescopic state, and the lumbar support can be close to the lumbar support under the action of external force and reset when the external force disappears; in the closed state, the piston rod and the cylinder barrel are kept relatively fixed, and the lumbar rest stays at the corresponding position. The gas spring is used as a main component for realizing the function of the back and forth movement of the waist rest, is connected with the waist rest and the waist rest supporting piece at the same time, is adjusted back and forth through the telescopic movement of the piston rod, and has two states of being capable of being stressed and elastically telescopic and fixing the position.

Preferably, the piston rod is connected with the lumbar support, the lumbar support is provided with a connecting seat, the front surface of the connecting seat is concavely provided with a connecting groove, the head of the piston rod is fixedly provided with a connecting plate vertical to the connecting seat, the connecting plate is positioned in the connecting groove and is connected with the connecting seat through a screw, and the connecting plate is provided with an avoidance opening to enable a switch of the head of the piston rod to pass through. The piston rod is fixed on the lumbar support through setting up the connecting plate and using the mode of screw connection, and the connection position of lumbar support and connecting plate is hidden to the setting up of spread groove, lets the connection position not too abrupt, keeps the pleasing to the eye of outward appearance.

Preferably, the cylinder barrel is connected with the lumbar support, the lumbar support comprises a lumbar support bracket and a lumbar support supporting piece, a through groove for the cylinder barrel body to pass through is formed in the lumbar support bracket, a cylinder cover is formed at one end of the cylinder barrel, a plurality of through holes are formed in the cylinder cover, screw holes are formed in the lumbar support bracket at positions matched with the through holes of the cylinder cover, and after the cylinder barrel is inserted into the lumbar support bracket, the through holes of the cylinder cover are aligned with the screw holes and screws are driven into the through holes to enable the cylinder barrel to be fixedly connected with the lumbar support bracket. The through groove is used for enabling the cylinder barrel to be tightly combined on the waist rest, the cylinder barrel is inserted into the through groove to reduce occupation of the space with the length, and then the cylinder barrel and the waist rest are fixed together through screws.

Preferably, a movable guide mechanism is further arranged between the lumbar support bracket and the lumbar support, the movable guide mechanism comprises a guide rod and a guide sleeve, the guide rod is connected to one of the lumbar support bracket or the lumbar support, the guide sleeve is arranged on the other one of the lumbar support bracket or the lumbar support, and the guide rod is inserted into the guide sleeve. The guide rod and the guide sleeve form a movable guide mechanism along the movement direction of the piston rod, and meanwhile, the stability of the structure is enhanced.

Preferably, the guide rod is integrally formed on the lumbar support, the guide sleeve is integrally formed on the lumbar support, and the insertion depth of the guide rod and the guide sleeve is the same as the stroke of the piston rod in the gas spring. The guide rod is formed on the lumbar support, and the guide sleeve is formed on one surface of the lumbar support bracket connected with the lumbar support.

Preferably, the guide rod is integrally formed on the lumbar support, the guide sleeve is integrally formed on the lumbar support, and the insertion depth of the guide rod and the guide sleeve is the same as the stroke of the piston rod in the gas spring. In order to ensure that the guide rod and the guide sleeve cannot fall off, the connecting depth of the guide rod and the guide sleeve is the same as the stroke of the piston rod.

Preferably, the lumbar support comprises a supporting seat at the middle position and a containing part extending forwards from the supporting seat, the through groove penetrates through the containing part from front to back, the cylinder barrel is positioned in the through groove of the containing part, and the barrel cover is fixedly connected with the front end of the containing part. Because the cylinder length is generally longer, the accommodating part which can completely accommodate the cylinder is arranged on the lumbar support bracket, and the setting position of the accommodating part also exactly utilizes the spare space in the back end of the lumbar support.

Preferably, the supporting piece comprises auxiliary waist supports which are arranged at the front side of the waist support frame and are bilaterally symmetrical, a main waist support is connected between the two auxiliary waist supports, two sides of the main waist support are covered at the inner side ends of the auxiliary waist supports, two sides of the supporting seat symmetrically extend out of the supporting arms to two sides, the auxiliary waist support is rotationally connected with the end parts of the supporting arms, the auxiliary waist support comprises an auxiliary waist support body and side rods which are used for connecting the auxiliary waist support body to the supporting arms, the auxiliary waist support body is provided with an inner end close to the middle part of the support frame and an outer end far away from the middle part of the support frame, the side rods extend from the inner end towards the end parts of the supporting arms, the side rods are rotationally connected with the end parts of the supporting arms through side rotating shafts, and elastic pieces are connected between the auxiliary waist support and the main waist support; when the main waist support is stressed, the main waist support deflects and shifts to drive the auxiliary waist support to deflect along with the main waist support, and the elastic piece correspondingly generates corresponding reset elastic force in response to the linkage of the main waist support and the auxiliary waist support. The waist support is characterized in that the waist support body is connected with the waist support body in a three-zone mode, the middle main waist support can drive the auxiliary waist supports on two sides to rotate together after being stressed, the rotating direction is wrapped from outside to inside, the effect of wrapping the waist is formed, and the middle main waist support protrudes forwards relative to the auxiliary waist support and can better support the spine of a user.

Preferably, the elastic piece is an integrally formed elastic plate, the elastic plate comprises a middle plate and side plates extending from the middle plate to two sides in an inclined mode, the middle plate is connected to the back face of the main waist support, the end portions of the side plates are connected with the inner end of the auxiliary waist support body, and when the main waist support and the auxiliary waist support are linked, the side plates deform to generate reset elastic force. The elastic force between the main waist support and the auxiliary waist support is transmitted by an elastic plate, and the waist support is restored by the reset elastic force generated by the side plate on the auxiliary waist support after being used.

Preferably, a control element acting on the switch is arranged next to the switch of the piston rod head. In order to facilitate the operation of the gas spring by a user, a switch control member for the user is arranged beside the switch of the gas spring.

The principle and beneficial effects of the utility model adopting the technical scheme are as follows:

the utility model provides a lumbar support adjusting mechanism, which is characterized in that at least one gas spring is arranged between a lumbar support and a lumbar support, the gas spring comprises a cylinder barrel and a piston rod, the cylinder barrel is connected with one of the lumbar support and the lumbar support, the piston rod is connected with the other of the lumbar support and the lumbar support, therefore, the lumbar support and the lumbar support can achieve the purpose of moving forwards and backwards through the telescopic movement of the gas spring, and in general, the piston rod can be continuously and stably ejected by the cylinder barrel after the gas spring is opened without manual push-pull, and the whole-course manual adjustment like a common screw type front-back adjusting mechanism is not needed; a switch for controlling the state of the gas spring is arranged at the head part of the piston rod, and the pressing or bouncing of the switch determines the opening and closing states of the gas spring; when the spring is pressed down and the gas spring is in an open state, the piston rod is ejected out by the air pressure in the cylinder barrel and can be pressed back under the action of external force, and the piston rod can automatically reset when the external force disappears, and at the moment, the lumbar support can make corresponding movement according to the leaning force of a user; or after the lumbar support is adjusted to a desired position, the switch is turned on to switch the gas spring to a closed state, and the piston rod and the cylinder barrel are relatively fixed in the closed state, so that the lumbar support stays at the corresponding position.

Drawings

FIG. 1 is a perspective view of a seat;

FIG. 2 is a cross-sectional view of the seat with the gas spring retracted;

FIG. 2a is an enlarged view of FIG. 2A;

FIG. 3 is a cross-sectional view of the seat with the gas spring extended;

FIG. 3a is an enlarged view of B in FIG. 3;

FIG. 4 is a schematic diagram of the installation of a gas spring;

FIG. 5 is a top view of a schematic gas spring installation;

FIG. 6 is a perspective view of a lumbar support;

FIG. 6a is a perspective view of the spring;

FIG. 7 is a perspective view of a gas spring;

the reference numerals are as follows:

100-lumbar support, 101-connecting seats, 102-connecting grooves and 103-guide sleeves; 200-lumbar support, 201-lumbar support bracket, 202-lumbar support bearing piece, 203-through groove, 204-guide rod, 205-auxiliary lumbar support, 206-main lumbar support, 207-through hole, 208-screw hole, 209-supporting seat, 210-containing part, 211-support arm, 212-side rod, 213-elastic piece, 214-middle plate, 215-side plate, 216-inner end and 217-outer end; 300-gas springs, 301-piston rods, 302-cylinder barrels, 303-switches, 304-connecting plates, 305-avoiding ports and 306-cylinder covers; 400-moving the guiding mechanism; 500-control.

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, in the case of no conflict, the embodiments of the present application and the 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.

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

the present embodiment provides a lumbar support adjustment mechanism as shown in fig. 1-3, comprising a lumbar support 100 and a lumbar support 200 positioned in front of the lumbar support 100, wherein the innovation of the present embodiment is that at least one gas spring 300 as shown in fig. 7 is used to connect the lumbar support 100 and the lumbar support 200 and allow the two to move relatively back and forth along with the telescopic movement of a piston rod 301 and a cylinder tube 302 in the gas spring 300; as shown in fig. 4, the cylinder tube 302 of the gas spring 300 is mounted on the lumbar support 200 and the piston rod 301 is connected to the lumbar support 100, but the present embodiment is not limited to the cylinder tube 302 and the piston rod 301 being mounted on the lumbar support 100 and the lumbar support 200, and the cylinder tube 302 may be connected to the lumbar support 100 and the piston rod 301 may be connected to the lumbar support 200; as shown in fig. 7, the head of the piston rod 301 is further provided with a switch 303, the switch 303 enables the gas spring 300 to have an on state and an off state, and in order to facilitate the operation of a user, in this embodiment, a control member 500 as shown in fig. 2a and 3a is set up beside the switch 303 for the user to interact with; in the open state shown in fig. 3 and 3a, the control member 500 is advanced, the piston rod 301 is pushed out by the air pressure in the cylinder 302, but the piston rod 301 can be pushed back under the action of external force, at this time, the lumbar support 200 can be adjusted forward and backward along with the leaning force of the user, or can be switched to the closed state after being adjusted to the desired position, as in the closed state shown in fig. 2 and 2a, at this time, the control member 500 is in the retreated state, and the piston rod 301 and the cylinder 302 are relatively fixed, so that the lumbar support 200 stays at the corresponding position.

As to how the control member 500 is actuated, there are various implementations, such as the control member 500 may be connected to the lumbar support 100 in a screw manner, advanced or retracted in a rotational manner, and maintained in a corresponding position; still alternatively, the control member 500 may be advanced or retracted in a manner similar to the pressing of a ball pen, and thus the movable implementation of the control member 500 is not the point of the present utility model, and thus will not be described herein.

The general composition of the lumbar support adjustment mechanism is described above, and the following detailed description is made:

specifically, as shown in fig. 4 and 5, in the connection mode of the piston rod 301 and the lumbar support 100, firstly, a connection seat 101 is formed on the lumbar support 100, and a connection groove 102 is recessed in the surface of the connection seat 101, and a cross-sectional view of the connection groove 102 is shown in fig. 3 a; the head of the piston rod 301 is formed with a connecting plate 304, and the plane of the plate surface of the connecting plate 304 is perpendicular to the axial direction of the piston rod 301; the connecting plate 304 is placed in the connecting groove 102 and then fixedly connected to the connecting seat 101 by a screw, so that the purpose of fixedly connecting the piston rod 301 and the lumbar support 100 is achieved, and meanwhile, in order to enable the switch 303 to be used normally, an avoidance port 305 for the switch 303 to pass through is required to be formed in the connecting plate.

As shown in fig. 4 and 5, the lumbar support 200 includes a lumbar support bracket 201, and the cylinder 302 is a long cylindrical body, so that the lumbar support bracket 201 is provided with a through groove 203 matching the shape of the cylinder 302; the cylinder 302 cannot be fixed on the lumbar support 200 after being inserted into the through groove 203, therefore, a cylinder cover 306 is formed at one end of the cylinder 302, the area of the cylinder cover 306 is larger than the cross section area of the through groove 203, a through hole 207 is formed on the cylinder cover 306, a screw hole 208 is formed at the corresponding part of the lumbar support bracket 201 which is propped against by the cylinder cover 306, and after the two holes are aligned, screws are driven to enable the cylinder 302 to be fixedly connected on the lumbar support bracket; in this way, the two portions of the gas spring 300 are connected to the lumbar support 200 and the lumbar support 100, respectively.

As shown in fig. 5, regarding the detailed mounting position of the cylinder 302 on the lumbar support 201, the lumbar support 201 includes a support seat 209 at a middle position, and a receiving portion 210 having the support seat 209 and extending forward from the support seat 209, the through-slot 203 extends through the receiving portion 210, the cylinder 302 is mounted in the through-slot 203 of the receiving portion 210, and the cover 306 is attached to a plane of a front end of the receiving portion 210 and is connected by a screw.

However, as shown in fig. 3, the gravity pressure of the portion of the lumbar support 200 after the cylinder 302 is extended is borne by the piston rod 301, which is easy to break the piston rod 301 and unstable in structure, in order to solve the problem of unstable structure and reduce the pressure of the piston rod 301, as shown in fig. 3 and 5, a guide rod 204 and a guide sleeve 103 are further arranged between the lumbar support bracket and the lumbar support, and meanwhile, the guide rod 204 and the guide sleeve 103 form a moving guide mechanism 400, and the moving guide mechanism 400 can stabilize the telescopic movement of the gas spring 300 in one direction and prevent the gas spring 300 from driving the lumbar support 200 to rotate circumferentially; the length direction of the guide rod 204 and the guide sleeve 103 is the same as the telescopic movement direction of the piston rod 301, and the guide rod 204 is inserted into the guide sleeve 103 to form the movable guide mechanism 400.

As shown in fig. 2 and 3, in order to ensure that the guide rod 204 cannot easily fall out of the guide sleeve 103, the insertion depth of the guide rod 204 needs to be matched with the stroke of the piston rod 301 in the gas spring 300, and the guide rod 204 is integrally formed on the lumbar support 100, and the guide sleeve 103 is integrally formed on the lumbar support 201 in a manner as shown in fig. 5; in order to meet the needs of the general user, the stroke of the piston rod 301, i.e., the front-rear moving distance of the lumbar support 200 is generally set to be between 3 cm and 10cm, so that the insertion depth of the guide rod 204 in the guide sleeve 103 needs to be slightly greater than 10cm.

Further, the lumbar support 200 of the present embodiment is also configured to be used in cooperation with the gas spring 300, as shown in fig. 1, 2 and 6, the lumbar support 200 further includes a lumbar support 202, the lumbar support 202 includes a main lumbar support 206 made of elastic material and connected between two auxiliary lumbar supports 205 and two auxiliary lumbar supports 205 on both sides of the lumbar support 201, and the main lumbar support 206 is located in front of the auxiliary lumbar support 205 and is used as a main body for bearing the leaning force of the waist of the user; the main lumbar support 206 in this embodiment is made of a memory sponge, and has the advantages that the main lumbar support can quickly generate corresponding deformation after being forced by a user and quickly recover to the original shape after the user withdraws; the auxiliary lumbar support 205 comprises an inner side 216 close to the middle of the lumbar support bracket 201 and an outer side 217 far from the middle of the bracket lumbar support bracket 201, and two sides of the main lumbar support 206 cover the inner sides 216 of the two auxiliary lumbar supports 205 close to the lumbar support bracket 201; in connection between the lumbar support 201 and the lumbar support 202, first, two sides of a support seat 209 in the middle of the lumbar support 201 are symmetrically extended with support arms 211, a side rod 212 is extended from an inner end 216 of the auxiliary lumbar support 205 to the inner center direction of the auxiliary lumbar support 205, and the side rod 212 is rotatably connected with the support arms 211; an elastic piece 213 is further arranged between the auxiliary waist support 205 and the main waist support 206, when the main waist support 206 is stressed to generate deflection displacement, the auxiliary waist support 205 on two sides is driven to deflect, and at the moment, the elastic piece 213 responds to linkage corresponding to the main waist support 206 and the auxiliary waist support 205 to generate corresponding reset elastic force, so that the main waist support 206 and the auxiliary waist support 205 can quickly return to the original positions after a user withdraws leaning force.

The design of the elastic member 213 is further described below: as shown in fig. 6a, the elastic member 213 is an integrally formed elastic plate, the elastic member 213 may be a flat plate first, then the middle portion protrudes out to form an intermediate plate 214, the intermediate plate 214 may be formed by stamping or bending the plate several times, and two sides of the intermediate plate 214 are side plates 215; the middle plate 214 is partially connected to the back of the main lumbar support 206, and the two side plates 215 are connected to the inner sides of the auxiliary lumbar support 205 on both sides; when the main lumbar support 206 and the sub lumbar support 205 are interlocked, the side plate 215 is deformed by pressure and generates a restoring elastic force.

An empty space is formed between the support seat 209 and the middle plate 214 of the front elastic member 213, and the receiving part 210 is located in the empty space, thereby fully utilizing the inner space of the lumbar support 200.

When the front-back telescopic function of the lumbar support 200 is needed, the user only needs to make the control member 500 switch the state of the switch 303; in the normal state, as shown in fig. 2 and fig. 2a, the switch 303 and the control member 500 are both in the open state, the piston rod 301 and the cylinder 302 cannot move in a telescopic manner, and the lumbar support 200 is integrally fixed at a preset position; when the user wants to adjust the position of the lumbar support 200 or wants to let the lumbar support 200 have the function of elastically stretching back and forth to push the waist, the control member 500 is controlled to advance and the switch 303 is pressed down, as shown in fig. 3 and 3a, the air spring 300 starts to work, the air pressure in the cylinder 302 drives the piston rod 301 to move outwards but can be pressed back when enough pressure is applied, the user can adjust the lumbar support 200 to the desired position and then press the control member 500 to close the switch 303, so that the cylinders 302 and 301 do not work any more to fix the lumbar support at the corresponding positions; alternatively, the control member 500 may be kept open without holding the switch 303, and the elastic lumbar support function of the lumbar support 200 may be used, and the lumbar support 202 designed as a three-zone lumbar support may be mounted to provide sufficient support to the lumbar.

The utility model and its embodiments have been described above by way of illustration and not limitation, and the utility model is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present utility model.

Claims (9)

1. The utility model provides a lumbar support adjustment mechanism, includes lumbar support and is in lumbar support the place ahead of lumbar support, its characterized in that: at least one gas spring is connected between the lumbar support and the lumbar support, the gas spring comprises a cylinder barrel and a piston rod, the cylinder barrel is connected with one of the lumbar support or the lumbar support, and the piston rod is connected with the other of the lumbar support or the lumbar support; the head of the piston rod is provided with a switch which has an open state and a closed state, and in the open state, the piston rod is in a free telescopic state, and the lumbar support can be close to the lumbar support under the action of external force and reset when the external force disappears; in the closed state, the piston rod and the cylinder barrel are kept relatively fixed, and the lumbar rest stays at the corresponding position.

2. A lumbar adjustment mechanism as set forth in claim 1, wherein: the piston rod is connected with the waist support, a connecting seat is formed on the waist support, a connecting groove is concavely formed in the front surface of the connecting seat, a connecting plate perpendicular to the connecting groove is fixedly arranged on the head of the piston rod, the connecting plate is positioned in the connecting groove and is connected with the connecting seat through a screw, and an avoidance opening is formed in the connecting plate to enable a switch of the head of the piston rod to pass through.

3. A lumbar adjustment mechanism as set forth in claim 1, wherein: the cylinder is connected with the waist rest, the waist rest comprises a waist rest support and a waist rest supporting piece, a through groove for the cylinder body to pass through is formed in the waist rest support, a cylinder cover is formed at one end of the cylinder, a plurality of through holes are formed in the cylinder cover, screw holes are formed in the waist rest support and matched with the through holes of the cylinder cover, and after the cylinder is inserted into the waist rest support, the through holes of the cylinder cover are aligned with the screw holes and screws are driven into the through holes to enable the cylinder and the waist rest support to be fixedly connected.

4. A lumbar adjustment mechanism according to claim 3, wherein: the waist support is characterized in that a movable guide mechanism is further arranged between the waist support frame and the waist support piece, the movable guide mechanism comprises a guide rod and a guide sleeve, the guide rod is connected to one of the waist support frame or the waist support piece, the guide sleeve is arranged on the other one of the waist support frame or the waist support piece, and the guide rod is inserted into the guide sleeve.

5. The lumbar support adjustment mechanism of claim 4 wherein: the guide rod is integrally formed on the lumbar support, the guide sleeve is integrally formed on the lumbar support, and the insertion depth of the guide rod and the guide sleeve is the same as the stroke of the piston rod in the gas spring.

6. A lumbar adjustment mechanism according to claim 3, wherein: the waist support comprises a supporting seat at the middle position and a containing part which is forwards stretched by the supporting seat, the through groove penetrates through the containing part from front to back, the cylinder barrel is positioned in the through groove of the containing part, and the barrel cover is fixedly connected with the front end of the containing part.

7. The lumbar support adjustment mechanism of claim 6 wherein: the support piece comprises auxiliary waist supports which are arranged on the front side of the waist support frame and are symmetrically arranged left and right, a main waist support is connected between the two auxiliary waist supports, two sides of the main waist support are covered at the inner side ends of the auxiliary waist supports, support arms extend symmetrically to two sides of the support seat, the auxiliary waist support is rotationally connected with the end parts of the support arms, the auxiliary waist support comprises an auxiliary waist support body and side rods used for connecting the auxiliary waist support body to the support arms, the auxiliary waist support body is provided with an inner end close to the middle part of the support frame and an outer end far away from the middle part of the support frame, the side rods extend from the inner end towards the end parts of the support arms, the side rods are rotationally connected with the end parts of the support arms through side rotating shafts, and elastic pieces are connected between the auxiliary waist support and the main waist support; when the main waist support is stressed, the main waist support deflects and shifts to drive the auxiliary waist support to deflect along with the main waist support, and the elastic piece correspondingly generates corresponding reset elastic force in response to the linkage of the main waist support and the auxiliary waist support.

8. The lumbar support adjustment mechanism of claim 7, wherein: the elastic piece is an integrally formed elastic plate, the elastic plate comprises a middle plate and side plates extending from the middle plate to two sides in an inclined mode, the middle plate is connected to the back face of the main waist support, the end portions of the side plates are connected with the inner end of the auxiliary waist support body, and when the main waist support and the auxiliary waist support are linked, the side plates deform to generate reset elastic force.

9. A lumbar adjustment mechanism as set forth in claim 1, wherein: a control piece acting on the switch is arranged beside the switch at the head part of the piston rod.