CN212280602U

CN212280602U - Chassis structure with seat-back synchronous linkage device

Info

Publication number: CN212280602U
Application number: CN202021385687.2U
Authority: CN
Inventors: 翁永联
Original assignee: Zhongshan Jiwen Furniture Co ltd
Current assignee: Zhongshan Jiwen Furniture Co ltd
Priority date: 2020-07-15
Filing date: 2020-07-15
Publication date: 2021-01-05
Anticipated expiration: 2030-07-15

Abstract

The utility model discloses a chassis structure with a seat-back synchronous linkage device, which comprises a bottom plate fixedly arranged at the bottom of a seat and linked with the seat, a chassis arranged below the bottom plate, a tail plate component arranged between the bottom plate and the chassis and linked with a back, a seat-back synchronous linkage device arranged in the chassis, a locking mechanism arranged in the chassis and a lifting mechanism arranged on the chassis; the tail plate assembly comprises a tail plate and warped plates fixedly arranged on two sides of the tail plate, and the warped plates extend between the side surface of the chassis and the side surface of the bottom plate; the seat back synchronous linkage device comprises a first fulcrum shaft hinged to the side face of the chassis and the rocker, a first rotating shaft located in front of the first fulcrum shaft and hinged to the first fulcrum shaft through a rotating connecting rod, a second rotating shaft located in front of the first rotating shaft and hinged to the side faces of the rocker and the bottom plate, and an elastic reset mechanism playing a reset role on the bottom plate and the tail plate assembly, wherein the first rotating shaft is hinged to the rocker and the side face of the bottom plate.

Description

Chassis structure with seat-back synchronous linkage device

Technical Field

The utility model relates to the technical field of swivel chairs, in particular to a chassis structure with a seat and back synchronous linkage device.

Background

The swivel chair has the functions of lifting, inclining, rotating and the like, is mainly composed of chair legs, a pneumatic rod, a cylinder, a chassis structure, a chair seat and a backrest, various functions of the swivel chair are mainly realized through the chassis structure, along with the increasing improvement of living standard of people, the requirement of people on the comfort level of the swivel chair is higher and higher, the function of synchronous linkage of the chair seat and the backrest appears in the existing swivel chair, which means that the chair seat and the backrest synchronously operate when inclining, but the existing synchronous linkage device of the chair seat and the backrest has the defects of complex structure, various parts, difficult disassembly and assembly, low assembly efficiency, large processing difficulty and low production efficiency, so that the production cost is high, the structural design of the existing synchronous linkage device of the chair seat and the backrest is not scientific and reasonable enough, and when inclining, a user can resist the own weight acting on the chair, the backrest needs to be applied with a large force, so that the comfort of a user is affected, the user feels hard when leaning, and the conventional elastic resetting mechanism sometimes has the problem of insufficient elasticity, so that the condition of weightlessness is easy to occur, the potential safety hazard is caused, and the comfort is general. In addition, the existing chassis structure does not have the function of elastic force adjustment, and the requirements of people are difficult to meet.

Therefore, how to realize a simple structure, design scientific and reasonable, spare part is few, the dismouting is simple and easy convenient, effectively improve the packaging efficiency, can be according to user's weight automatically regulated elasticity size of bending backward, it is light easy to incline the operation, the user can be to the back, the seat support disposes the adjustment in order to obtain the best posture, the travelling comfort is strong, and elasticity canceling release mechanical system elasticity is very sufficient, effectively prevent the condition of weightlessness, the security is high, the synchronous aggregate unit of back of a seat that has elasticity regulatory function simultaneously is the technological problem that awaits the solution in an urgent need in the industry.

Disclosure of Invention

The utility model aims at providing a chassis structure with synchronous aggregate unit of seat back, aim at realizing a simple structure, design scientific and reasonable, spare part is few, the dismouting is simple and easy convenient, effectively improve the packaging efficiency, can be according to user's weight automatically regulated elasticity size of bending backward, it is easy easily to incline the operation of bending backward, the user can be to the back, the seat support disposes the adjustment in order to obtain the best posture, the travelling comfort is strong, and elasticity canceling release mechanical system elasticity is ten sufficient, effectively prevent the condition of weightlessness, the security is high, the chassis structure who has elasticity regulatory function simultaneously.

The utility model provides a chassis structure with a seat-back synchronous linkage device, which comprises a bottom plate fixedly arranged at the bottom of a seat and linked with the seat, a chassis arranged below the bottom plate, a tail plate component arranged between the bottom plate and the chassis and linked with a backrest, a seat-back synchronous linkage device arranged in the chassis, a locking mechanism arranged in the chassis and used for keeping the back-seat synchronous linkage device in an initial state or a lifting state, and a lifting mechanism arranged on the chassis; the tail plate assembly comprises a tail plate and warped plates fixedly arranged on two sides of the tail plate, and the warped plates extend between the side surface of the chassis and the side surface of the bottom plate; the seat back synchronous linkage device comprises a first fulcrum shaft hinged to the side face of the chassis and the rocker, a first rotating shaft located in front of the first fulcrum shaft and hinged to the first fulcrum shaft through a rotating connecting rod, a second rotating shaft located in front of the first rotating shaft and hinged to the side faces of the rocker and the bottom plate, and an elastic reset mechanism for resetting the bottom plate and the tail plate assembly; the elastic reset mechanism comprises a second fulcrum shaft hinged on the side face of the chassis, a third rotating shaft positioned in front of the second fulcrum shaft and hinged on the warping plate, a telescopic connecting shaft assembly connected between the second fulcrum shaft and the third rotating shaft, and a pressure spring sleeved outside the connecting shaft assembly and constrained between the second fulcrum shaft and the third rotating shaft, wherein when the warping plate rotates upwards and backwards, the third rotating shaft rotates around the second fulcrum shaft so as to enable the third rotating shaft to gradually approach the second fulcrum shaft and further force the pressure spring to contract and generate elasticity; the seat back synchronous linkage device also comprises a force adjusting mechanism capable of adjusting the elastic force of the pressure spring, the force adjusting mechanism comprises a force adjusting fixed seat arranged on the third rotating shaft, a force adjusting inclined block glue which is tightly attached to the rear end of the force adjusting fixed seat and provided with an inclined plane, a pressure spring force adjusting top glue tightly attached to the inclined plane, and a force adjusting wrench which is arranged between the force adjusting fixed seat and the force adjusting inclined block glue and has a pushing effect on the force adjusting inclined block glue, the pressure spring is restrained between the pressure spring force adjusting top glue and a second fulcrum shaft, the force adjusting fixed seat extends towards the rear to form a connecting column which penetrates through the force adjusting inclined block glue and the pressure spring force adjusting top glue, the force adjusting wrench comprises a rotating seat part, a trapezoidal wrench part and a hand-held part, the rotating seat part extends towards two sides to form a wrench rotating shaft, the force adjusting fixed seat and the force adjusting inclined block glue are provided with rotating shaft grooves correspondingly matched with the wrench rotating shaft, the width of the wrench part is, the wrench part gradually pushes the force-adjusting inclined block rubber to move towards the direction of the second fulcrum shaft, so that a pre-pressing effect is exerted on the pressure spring, the initial compression quantity is increased, and the function of adjusting the elasticity of the pressure spring is finally achieved.

Preferably, the lifting mechanism comprises a mounting hole which is arranged on the chassis and connected with a pneumatic rod of the swivel chair, a cylinder switch which is arranged on the mounting hole and can control the cylinder of the swivel chair to work, a locking adjusting handle which extends into the chassis from the side and can rotate, and lifting pressure plate glue which is sleeved and fixed on the locking adjusting handle and can press the cylinder switch, wherein the lifting pressure plate glue is driven to rotate when the locking adjusting handle is rotated so that the lifting pressure plate glue is pressed to the cylinder switch to realize the lifting function; the locking adjusting handle comprises a handle iron branch which extends into the chassis from the side face and can rotate, handle glue which is assembled and fixed with the handle iron branch, and handle clamping glue which is arranged at the joint of the handle iron branch and the handle glue and can realize quick assembly and disassembly, wherein a clamping hole is formed in the handle glue, an annular clamping edge groove is formed in the opening at the lower end of the clamping hole, left and right clamping grooves are formed in the handle iron branch, the handle iron branch is inserted into the handle glue, the left and right clamping grooves correspond to the clamping hole, left and right clamping feet are arranged on the handle clamping glue, clamping blocks are outwards arranged at the tail ends of the left and right clamping feet, the left and right clamping feet are inserted into the clamping holes and penetrate into the two sides of the left.

Preferably, the locking mechanism comprises a locking adjusting handle which extends into the chassis from the side face and can perform inner and outer push-and-pull movement, a lifting pressure plate rubber which is sleeved on the locking adjusting handle and moves along with the inner and outer push-and-pull movement of the locking adjusting handle, gear locking teeth which are sleeved on the second rotating shaft and the third rotating shaft and are provided with a plurality of gear bayonets, a lock tongue plate which is arranged beside the gear locking teeth and can be clamped into the gear bayonets, a pressing plate arranged on the lock tongue plate, and a locking torsion spring which is connected between the lock tongue plate and the lifting pressure plate rubber and plays a transmission role, wherein a guide rail groove is arranged on the pressing plate, a guide pillar which can move along the guide rail groove is arranged on the lock tongue plate, the middle part of the locking torsion spring is fixed on the chassis through a screw, one end of the locking torsion spring is connected with the lifting.

Preferably, the chassis structure further comprises a protective cover covering the chassis.

The utility model discloses a simple structure, design scientific and reasonable, spare part is few, and the dismouting is simple and easy convenient, effectively improves the packaging efficiency, can be according to user's weight automatically regulated elasticity size of bending backward, it is easy and light to incline the operation, and the user can dispose the adjustment in order to obtain the best posture to back, seat support, and the travelling comfort is strong, and elasticity canceling release mechanical system elasticity is very sufficient, effectively prevents the condition of weightlessness from appearing, and the security is high, has elasticity regulatory function's chassis structure simultaneously.

Drawings

Fig. 1 is a schematic perspective view of an embodiment of a chassis structure with a seat-back synchronous linkage according to the present invention;

fig. 2 is a second schematic perspective view of an embodiment of a chassis structure with a seat-back synchronous linkage according to the present invention;

FIG. 3 is a partially exploded view of an embodiment of the chassis structure with a seat back synchronization linkage of the present invention;

FIG. 4 is an enlarged view of portion A of FIG. 3;

FIG. 5 is a second partially exploded view of the chassis structure with a seat back synchronization linkage according to an embodiment of the present invention, wherein the bottom plate is not shown;

FIG. 6 is a third schematic exploded view of a portion of an embodiment of a chassis structure with a seat-back synchronous linkage according to the present invention;

FIG. 7 is a fourth partially exploded view of the chassis structure with a seat and back synchronous linkage according to an embodiment of the present invention;

FIG. 8 is a fifth exploded view of a portion of an embodiment of the chassis structure with a seat-back synchronous linkage of the present invention;

FIG. 9 is a sixth schematic view of a partially exploded view of an embodiment of the chassis structure with a seat-back synchronous linkage of the present invention;

fig. 10 is an enlarged view of a portion B in fig. 9.

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1 to 10, an embodiment of the chassis structure with a seat and back synchronous linkage device of the present invention is provided, which includes a bottom plate 101 fixedly disposed at the bottom of the seat and linked and connected with the seat, a chassis 102 disposed below the bottom plate 101, a tail plate assembly disposed between the bottom plate 101 and the chassis 102 and linked and connected with the backrest, a seat and back synchronous linkage device disposed in the chassis 102, a locking mechanism disposed in the chassis 102 for keeping the seat and back synchronous linkage device in an initial state or in a lifted state, and a lifting mechanism disposed on the chassis 102, wherein the chassis structure further includes a protective cover 103 disposed outside the chassis 102.

The tail plate assembly comprises a tail plate 104 and a warped plate 105 fixedly arranged on two sides of the tail plate 104, wherein the warped plate 105 extends between the side surface of the chassis 102 and the side surface of the bottom plate 101.

The seat back synchronous linkage device comprises a first fulcrum shaft 106 hinged on the side surface of the chassis 102 and the rocker 105, a first rotating shaft 108 positioned in front of the first fulcrum shaft 106 and hinged with the first fulcrum shaft 106 through a rotating connecting rod 107, a second rotating shaft 109 positioned in front of the first rotating shaft 108 and hinged on the side surfaces of the rocker 105 and the bottom plate 101, and an elastic reset mechanism for resetting the bottom plate 101 and the tail plate assembly, the first rotating shaft 108 is hinged to the rocker 105 and the side surface of the bottom plate 101, when the backrest tilts backwards, the tail plate assembly is driven to rotate upwards and backwards, namely, the rocker 105 is driven to rotate upwards and backwards around the first fulcrum shaft 106, the rocker 105 drives the first rotating shaft 108 and the second rotating shaft 109 to rotate upwards and backwards around the first fulcrum shaft 106, so that the bottom plate 101 is driven to move upwards and backwards, and when the bottom plate 101 rises, the rising height of the front part of the bottom plate 101 is greater than the rising height of the rear part of the bottom plate 101.

The elastic reset mechanism comprises a second fulcrum shaft 110 hinged on the side surface of the chassis 102, a third rotating shaft 111 located in front of the second fulcrum shaft 110 and hinged on the rocker 105, a telescopic connecting shaft assembly 112 connected between the second fulcrum shaft 110 and the third rotating shaft 111, and a pressure spring 113 sleeved outside the connecting shaft assembly 112 and constrained between the second fulcrum shaft 110 and the third rotating shaft 111, wherein when the rocker 105 rotates upwards and backwards, the third rotating shaft 111 rotates around the second fulcrum shaft 110, so that the third rotating shaft 111 gradually approaches the second fulcrum shaft 110 to force the pressure spring 113 to contract and generate elastic force. This synchronous linkage of seat back can be according to user's weight automatically regulated elasticity size of bending backward, and the in-process of bending backward, when user's weight is great, the tailboard subassembly, bottom plate 101 are great to the effort of pressure spring 113, and the compression is received to pressure spring 113 more seriously, and the bounce-back force is just big more, and pressure spring 113 is also big more to the reaction force of tailboard subassembly, bottom plate 101, can be according to user's weight automatically regulated elasticity size of bending backward. This elasticity canceling release mechanical system adopts pressure spring 113, and pressure spring 113 is the helical spring who bears pressure, and the pressure that can bear is strong, and the elastic coefficient is high, when inclining, even the user leans back to the final when being the biggest inclination, the dynamics that the user applied force in pressure spring 113 is also the biggest, and the user can easily be dealt with to the application of force of back and bottom plate 101 to this elasticity canceling release mechanical system's pressure spring 113 elasticity, the condition of weightlessness can not appear, and the travelling comfort when the user inclines to face upward is high moreover. The utility model discloses synchronous aggregate unit of seat back of the body's simple structure, design scientific and reasonable, spare part is few, can incline to face upward elasticity size after according to user's weight automatically regulated, and it is easy to incline to face upward the operation easily, and the user can dispose the adjustment in order to obtain the best posture to back, seat support, and the travelling comfort is strong, and elasticity reset mechanism elasticity is sufficient, effectively prevents the condition of weightlessness, and the security is high.

The seat back synchronous linkage device also comprises a force adjusting mechanism capable of adjusting the elasticity of the pressure spring 113, the force adjusting mechanism comprises a force adjusting fixed seat 123 arranged on the third rotating shaft 111, a force adjusting oblique block rubber 124 which is tightly attached to the rear end of the force adjusting fixed seat 123 and provided with an inclined surface, a pressure spring force adjusting top rubber 125 tightly attached to the inclined surface, and a force adjusting wrench which is arranged between the force adjusting fixed seat 123 and the force adjusting oblique block rubber 124 and has a pushing effect on the force adjusting oblique block rubber 124, the pressure spring 113 is restrained between the pressure spring force adjusting top rubber 125 and the second fulcrum shaft 110, the force adjusting fixed seat 123 extends towards the rear to form a connecting column which penetrates through the force adjusting oblique block rubber 124 and the pressure spring force adjusting top rubber 125, the force adjusting wrench comprises a rotating seat part 126, a trapezoidal wrench part 127 and a handheld part 128, wrench rotating shafts 129 extend from the rotating seat part 126 towards two sides, the force adjusting fixed seat 123 and the force adjusting oblique block rubber 124 are provided with rotating shaft grooves 138, the width of the wrench part 127 gradually increases outwards, and when the force adjusting wrench is pulled off from the initial position, the wrench part 127 gradually pushes the force adjusting sloping block rubber 124 to move towards the direction of the second fulcrum shaft 110, so that the pre-pressing effect is exerted on the pressure spring 113, the initial compression amount is increased, the elasticity of the pressure spring 113 can be adjusted by adjusting the initial pre-pressing length of the pressure spring 113, and the function of adjusting the elasticity of the pressure spring is realized.

The lifting mechanism comprises a mounting hole 130 arranged on the chassis 102 and connected with a pneumatic rod of the swivel chair, a cylinder switch arranged on the mounting hole 130 and capable of controlling the cylinder of the swivel chair to work, a rotatable locking adjusting handle extending into the chassis 102 from the side surface, and a lifting pressure plate rubber 114 sleeved on the locking adjusting handle and capable of pressing the cylinder switch, wherein the lifting pressure plate rubber 114 is driven to rotate when the locking adjusting handle is rotated to enable the lifting pressure plate rubber 114 to be pressed to the cylinder switch so as to realize the lifting function. The locking adjusting handle comprises a handle iron branch 131 which extends into the chassis 102 from the side and can rotate, a handle adhesive 132 assembled and fixed with the handle iron branch 131, and a handle clamping adhesive 133 which is arranged at the joint of the handle iron branch 131 and the handle adhesive 132 and can realize quick assembly and disassembly, wherein a clamping hole 134 is formed in the handle adhesive 132, an annular clamping edge groove is formed in an opening at the lower end of the clamping hole 134, a left clamping groove 135 and a right clamping groove 135 are formed in the handle iron branch 131, the handle iron branch 131 is inserted into the handle adhesive 132, the left clamping groove 135 and the right clamping groove 135 correspond to the clamping hole 134, a left clamping foot 136 and a right clamping foot 136 are arranged on the handle clamping adhesive 133, a clamping block 137 is outwards arranged at the tail end of the left clamping foot 136 and the right clamping foot 136 are inserted into the clamping hole 134 and penetrate.

During the equipment, only need insert handle iron branch 131 in handle glue 132 and make about draw-in groove 135 correspond with card hole 134, then the card insert handle card glue 133 can, the dismouting is simple and easy convenient, makes locking adjustment handle form quick assembly disassembly structure, effectively improves the packaging efficiency.

The locking mechanism comprises a locking adjusting handle which extends into the chassis 102 from the side surface and can be pushed and pulled inwards and outwards, a lifting and lowering plate rubber 114 which is sleeved and fixed on the locking adjusting handle and moves along with the pushing and pulling inwards and outwards of the locking adjusting handle, a gear locking tooth 115 which is sleeved and fixed on the second rotating shaft 109 and the third rotating shaft 111 and is provided with a plurality of gear bayonets 116, a lock tongue plate 117 which is arranged beside the gear locking tooth 115 and can be clamped into the gear bayonets 116, a pressing plate 118 which is arranged on the lock tongue plate 117, and a locking torsion spring 119 which is connected between the lock tongue plate 117 and the lifting and lowering plate rubber 114 and plays a transmission role, the pressing plate 118 is provided with a guide rail groove 120, the tongue-locking plate 117 is provided with a guide post 121 which can move along the guide rail groove 120, the middle part of the locking torsion spring 119 is fixed on the chassis 102 through a screw 122, one end of the locking torsion spring 119 is connected with the lifting pressing plate rubber 114, and the other end of the locking torsion spring 119 is connected with the guide post 121 on the tongue-locking plate 117.

When the gear locking teeth 115 move along with the movement of the second rotating shaft 109 and the third rotating shaft 111, the lock tongue plate 117 corresponds to a certain gear bayonet 116 of the gear locking teeth 115, when the inclination angle needs to be locked, the locking adjustment handle is pushed, the locking adjustment handle drives the pressure rising and reducing plate rubber 114 to move so as to drive the locking torsion spring 119 to move, the movement of the locking torsion spring 119 drives the lock tongue plate 117 to move along the guide rail groove 120, and finally the lock tongue plate 117 is moved to be clamped into the gear bayonet 116, so that the movement of the second rotating shaft 109 and the third rotating shaft 111 is locked. When unlocking is needed to be performed, only the locking adjusting handle needs to be pulled out reversely, the locking mechanism is simple and reasonable in structure, the back seat synchronous linkage device can be kept in an initial state or a lifting state through a simple structure, locking in the lifting state can be achieved, and the locking mechanism is easy and convenient to operate.

Through this synchronous linkage of seat back, can make the user simply comfortably operate of leaning on relatively self weight, when adjusting suitable inclination, can lock inclination through locking mechanical system, user's accessible synchronous linkage of seat back comes to dispose the adjustment in order to obtain the best posture to back, seat support, and the travelling comfort is strong.

The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structural changes made by the contents of the specification and the drawings, or the direct or indirect application in other related technical fields, are included in the same way in the protection scope of the present invention.

Claims

1. The chassis structure with the seat-back synchronous linkage device is characterized by comprising a bottom plate fixedly arranged at the bottom of a chair seat and in linkage connection with the chair seat, a chassis arranged below the bottom plate, a tail plate assembly arranged between the bottom plate and the chassis and in linkage connection with a backrest, the seat-back synchronous linkage device arranged in the chassis, a locking mechanism arranged in the chassis and used for keeping the back-seat synchronous linkage device in an initial state or a lifting state, and a lifting mechanism arranged on the chassis;

the tail plate assembly comprises a tail plate and warped plates fixedly arranged on two sides of the tail plate, and the warped plates extend between the side surface of the chassis and the side surface of the bottom plate;

the seat back synchronous linkage device comprises a first fulcrum shaft hinged to the side face of the chassis and the rocker, a first rotating shaft located in front of the first fulcrum shaft and hinged to the first fulcrum shaft through a rotating connecting rod, a second rotating shaft located in front of the first rotating shaft and hinged to the side faces of the rocker and the bottom plate, and an elastic reset mechanism for resetting the bottom plate and the tail plate assembly;

the elastic reset mechanism comprises a second fulcrum shaft hinged on the side face of the chassis, a third rotating shaft positioned in front of the second fulcrum shaft and hinged on the warping plate, a telescopic connecting shaft assembly connected between the second fulcrum shaft and the third rotating shaft, and a pressure spring sleeved outside the connecting shaft assembly and constrained between the second fulcrum shaft and the third rotating shaft, wherein when the warping plate rotates upwards and backwards, the third rotating shaft rotates around the second fulcrum shaft so as to enable the third rotating shaft to gradually approach the second fulcrum shaft and further force the pressure spring to contract and generate elasticity;

the seat back synchronous linkage device also comprises a force adjusting mechanism capable of adjusting the elastic force of the pressure spring, the force adjusting mechanism comprises a force adjusting fixed seat arranged on the third rotating shaft, a force adjusting inclined block glue which is tightly attached to the rear end of the force adjusting fixed seat and provided with an inclined plane, a pressure spring force adjusting top glue tightly attached to the inclined plane, and a force adjusting wrench which is arranged between the force adjusting fixed seat and the force adjusting inclined block glue and has a pushing effect on the force adjusting inclined block glue, the pressure spring is restrained between the pressure spring force adjusting top glue and a second fulcrum shaft, the force adjusting fixed seat extends towards the rear to form a connecting column which penetrates through the force adjusting inclined block glue and the pressure spring force adjusting top glue, the force adjusting wrench comprises a rotating seat part, a trapezoidal wrench part and a hand-held part, the rotating seat part extends towards two sides to form a wrench rotating shaft, the force adjusting fixed seat and the force adjusting inclined block glue are provided with rotating shaft grooves correspondingly matched with the wrench rotating shaft, the width of the wrench part is, the wrench part gradually pushes the force-adjusting inclined block rubber to move towards the direction of the second fulcrum shaft, so that a pre-pressing effect is exerted on the pressure spring, the initial compression quantity is increased, and the function of adjusting the elasticity of the pressure spring is finally achieved.

2. The chassis structure with the seat-back synchronous linkage device as claimed in claim 1, wherein the lifting mechanism comprises a mounting hole arranged on the chassis and connected with a pneumatic rod of the swivel chair, a cylinder switch arranged on the mounting hole and capable of controlling the cylinder of the swivel chair to work, a locking adjusting handle extending into the chassis from the side and capable of rotating, and a lifting pressure plate rubber sleeved on the locking adjusting handle and capable of pressing the cylinder switch, wherein the locking adjusting handle is rotated to drive the lifting pressure plate rubber to rotate so that the lifting pressure plate rubber is pressed on the cylinder switch to realize the lifting function;

the locking adjusting handle comprises a handle iron branch which extends into the chassis from the side face and can rotate, handle glue which is assembled and fixed with the handle iron branch, and handle clamping glue which is arranged at the joint of the handle iron branch and the handle glue and can realize quick assembly and disassembly, wherein a clamping hole is formed in the handle glue, an annular clamping edge groove is formed in the opening at the lower end of the clamping hole, left and right clamping grooves are formed in the handle iron branch, the handle iron branch is inserted into the handle glue, the left and right clamping grooves correspond to the clamping hole, left and right clamping feet are arranged on the handle clamping glue, clamping blocks are outwards arranged at the tail ends of the left and right clamping feet, the left and right clamping feet are inserted into the clamping holes and penetrate into the two sides of the left.

3. The chassis structure with the seat-back synchronous linkage device as claimed in claim 2, wherein the locking mechanism comprises a locking adjustment handle extending into the chassis from the side and capable of performing inward and outward pushing and pulling movements, a lifting plate rubber sleeved on the locking adjustment handle and capable of moving along with the inward and outward pushing and pulling movements of the locking adjustment handle, a gear locking tooth sleeved on the second rotation shaft and the third rotation shaft and having a plurality of gear notches, a tongue plate disposed beside the gear locking tooth and capable of being engaged in the gear notches, a pressing plate disposed on the tongue plate, a locking torsion spring connected between the tongue plate and the lifting plate rubber and having a transmission function, a guide rail groove disposed on the pressing plate, a guide post capable of moving along the guide rail groove disposed on the tongue plate, a middle portion of the locking torsion spring fixed on the chassis by a screw, and one end of the locking torsion spring connected with the lifting plate rubber, the other end of the locking torsion spring is connected with a guide post on the tongue locking plate.

4. The chassis structure with seat back synchronization linkage according to claim 1, 2 or 3, wherein the chassis structure further comprises a protective cover covering the chassis.