CN212938946U - Chassis mechanism of seat and seat - Google Patents

Abstract

The utility model discloses a chassis mechanism of a seat and the seat, which comprises a base, a bracket and a wane; a first pin shaft penetrates between the front end of the bracket and the front end of the base to enable the bracket to rotate around the base by taking the first pin shaft as a fulcrum; a second pin shaft penetrates between the front end of the rocker and the rear end of the base to enable the rocker to rotate around the base by taking the second pin shaft as a rotating shaft; a linkage structure is arranged between the rear end of the bracket and the rear end of the wane, and comprises a third pin shaft penetrating through the bracket and the wane and a track groove for guiding the motion track of the wane; the track grooves are formed in two sides of one of the wane or the bracket, and the third pin shaft penetrates through the track grooves; the bracket has a forward tilting state and a backward tilting state, and when the bracket tilts forward, the third pin shaft slides along the track groove and acts on the wane so that the rear end of the wane tilts upwards synchronously; when the bracket tilts backwards, the third pin shaft slides along the track groove and acts on the wane, so that the rear end of the wane tilts downwards synchronously; the chair realizes the synchronous tilting of the chair seat and the chair back.

Description

Chassis mechanism of seat and seat

Technical Field

The utility model relates to a thing to sit on field, in particular to chassis mechanism and seat of seat.

Background

Children generally have two states, reading and writing, which have different requirements on the angles of the backrest and the cushion of the chair; when reading, the backrest tilts backwards (the angle between the backrest and the horizontal plane is 100-120 degrees), a proper human body opening angle is kept, and the cushion also tilts upwards (the angle between the cushion and the horizontal plane is 3-10 degrees). During writing, the upper half of the human body inclines forwards (at an angle of 80-95 degrees to the horizontal direction), a proper human body opening angle is kept, the angle of the cushion is changed (at an angle of minus 10-plus 5 degrees to the horizontal direction), and the backrest is attached to the back of the human body forwards. In both states, the backrest is required to be tightly attached to the waist, particularly in a writing state, and the backrest is attached to the waist forwards, so that when writing is performed in incorrect postures such as arching of the waist or humpback of a human body, the backrest can provide force for the waist to ensure correct sitting posture of the human body, and the effects of myopia prevention and humpback prevention can be effectively achieved; therefore, the seat and the back of the chair need to be tilted synchronously, so that the back of the chair can always support the waist of a human body.

The base plate mechanism of the prior known backrest leaning chair consists of an upper tray, a lower tray, a fulcrum and a spring device, wherein after the upper tray is fixed with the back of the swivel chair, the swivel chair can be properly pitched around the fulcrum seat and can be actively restored, so that a user feels comfortable. However, the design of the seat chassis only considers the backward leaning state of the human body, and does not consider the forward leaning state of the human body; when the human body leans backwards and faces upwards to exert the force on the backrest, the backrest can be attached to the human body and backwards incline; when the human body leans forwards, the backrest does not contact with the backrest and does not attach to the human body forwards.

Therefore, a chassis with a seat and a back which tilt synchronously needs to be designed, when a human body sits on the seat and tilts backwards or forwards, the backrest is driven to tilt through the tilting of the seat; the backrest can always fit the waist of the human body to provide a supporting function, the burden of the human body is reduced, and the backrest is more in line with the human engineering. Such chassis generally frames include a base fixed to the bottom of the seat, a bracket for securing the seat, and a rocker for connecting the back of the seat; when the human body leans backwards or forwards on the chair seat, the bracket rotates around the base, the wane can rotate synchronously along with the rotation of the bracket so that the backrest always supports the human body, and in the chassis, the link mechanism of the wane and the bracket is the key point of the design and can solve the problems.

Disclosure of Invention

The utility model overcomes the defects in the prior art, and firstly provides a chassis mechanism of a chair, wherein a bracket of the chassis is connected with the chassis through a first pin shaft, and a wane is connected with the chassis through a second pin shaft; the bracket is connected with the wane through a third pin shaft, and a track groove is formed in the joint of the wane; the bracket rotates by taking the first pin shaft as a fulcrum, and the bracket has forward inclining and backward inclining states; when the bracket tilts forwards and backwards around the chassis, the third pin shaft slides along the track groove and acts on the wane, so that the rear end of the wane can be synchronously tilted upwards or downwards.

When a human body uses the chair to tilt forwards or backwards, the chair seat tilts forwards and backwards relative to the chair foot supporting components, and the chair back can tilt forwards and backwards around the chair foot supporting components simultaneously through the chassis mechanism to fit the waist of the human body so as to provide support.

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

a chassis mechanism of a seat comprises a base, a bracket and a wane; a first pin shaft penetrates between the front end of the bracket and the front end of the base to enable the bracket to rotate around the base by taking the first pin shaft as a fulcrum; a second pin shaft penetrates between the front end of the rocker and the rear end of the base to enable the rocker to rotate around the base by taking the second pin shaft as a rotating shaft; a linkage structure is arranged between the rear end of the bracket and the rear end of the wane, and comprises a third pin shaft and a track groove, wherein the third pin shaft is arranged on the bracket and the wane in a penetrating mode, and the track groove is used for guiding the motion track of the wane; the track grooves are formed in two sides of one of the wane or the bracket, and the third pin shaft penetrates through the track grooves; the bracket is positioned at the front end part of the first pin shaft to form a first lever, and the bracket is positioned at the rear end part of the first pin shaft to form a second lever; under the initial position, the bracket is in a horizontal state; the bracket has a forward tilting state and a backward tilting state, when the bracket tilts forward, the first lever tilts downwards, the second lever tilts upwards, and the third pin shaft slides along the track groove and acts on the wane so as to enable the rear end of the wane to tilt upwards synchronously; when the bracket tilts backwards, the first lever tilts upwards, the second lever tilts downwards, and the third pin shaft slides along the track groove and acts on the wane, so that the rear end of the wane tilts downwards synchronously.

The chassis mechanism of the chair of the utility model rotates around the rotating shaft as a pivot through the bracket, so that the second lever is upwarped or downwarped; meanwhile, the third pin shaft slides along the track groove to act on the seesaw, so that the rear end of the seesaw is synchronously tilted upwards or backwards; thereby make the rotation that can pass through the bracket make the wane rotate simultaneously, realize that seat, back incline and face upward in step.

Preferably, the second lever is longer than the first lever; in the forward tilting or backward tilting process of the bracket, along the height direction, the movement stroke of the front end of the first lever is smaller than the movement stroke of the rear end of the second lever. The bracket is enabled to have a smaller height range of the upper and lower tilting of the front end part of the bracket in the rotating process, and the comfort of the human body is not affected.

Preferably, when the bracket tilts forwards, the height of the third pin shaft is higher than that of the first pin shaft; when the bracket tilts backwards, the height of the third pin shaft is lower than that of the first pin shaft.

Preferably, the track grooves are symmetrically arranged on two sides of the rear end of the rocker plate, and from top to bottom, the track grooves incline towards the direction close to the base. When the third pin shaft slides along the track of the track groove, the third pin shaft can act on the rear end of the wane to upwarp and upwarp along the bracket, and the direction is kept consistent.

Preferably, the base comprises a bottom plate and supporting plates which extend upwards along the vertical direction along the left side and the right side of the bottom plate; the bracket comprises a supporting plate, and front connecting plates matched with the first pin shafts respectively extend downwards from two sides of the front end of the supporting plate; the supporting plate is positioned between the two front connecting plates, and two ends of the first pin shaft respectively penetrate through the supporting plate and the front connecting plates in sequence.

Preferably, the rocker comprises side plates arranged at left and right intervals and a mounting plate connected to the bottoms of the two side plates; the supporting plate is positioned between the two side plates, and two ends of the second pin shaft respectively penetrate through the supporting plate and the side plates in sequence.

Preferably, the rail groove is arranged at the rear end of the side plate; two sides of the rear end of the supporting plate respectively extend downwards to form rear connecting plates matched with a third pin shaft, and the two side plates are positioned between the rear connecting plates on the left side and the right side; two ends of the third pin shaft respectively penetrate through the track groove and the rear connecting plate in sequence.

Preferably, the first pin shaft is provided with a spring for returning the bracket in a rotating manner, the spring is a torsion spring, the torsion spring is sleeved on the first pin shaft, and two torsion arms of the torsion spring are respectively abutted against the bracket and the base. The reset spring makes the bracket have good damping sense in the process of rotating around the base, and can make the bracket reset.

A chair comprises a chair leg supporting assembly, a chair seat, a chair back and a chassis mechanism of the chair, wherein a base is connected with the chair leg supporting assembly, the chair back is connected with a warping plate, and the chair seat is connected with a bracket; the bracket is connected below the base and is positioned at the rear end of the base; the first pin shaft is positioned at the center of the lower part of the chair seat; when the bracket tilts forward, the chair seat tilts forward relative to the chair leg supporting components, and the chair back tilts backward synchronously; when the bracket tilts backwards, the chair seat tilts backwards relative to the chair leg supporting components, and the chair back tilts forwards synchronously. When the chair is used, the chair seat can tilt forwards or backwards relative to the chair foot supporting component according to the change of the posture and the center of a human body; by the chassis mechanism, the chair back can tilt synchronously in the tilting process of the chair seat; the chair back can be always attached to the waist of a human body to provide support, so that the chair is more comfortable to use.

Preferably, a connecting rod is connected between the chair back and the wane, and the wane rotates around the base and acts on the chair back to enable the chair back to tilt.

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

1, the rocker can synchronously rotate while the bracket rotates around the base under the combined action of the first pin shaft, the second pin shaft and the third pin shaft; the bracket tilts forwards, and the rear end of the wane tilts upwards; the bracket tilts backwards, and the rear end of the wane tilts downwards; therefore, the seat and the back of the seat using the chassis can keep synchronous inclination, and the chair back is always attached to the back of a human body in the using process of the seat; the material accords with human engineering mechanics; especially when the child uses, the backrest is attached to the waist forwards, so that when the child writes under incorrect postures such as waist arching or humpback and the like, the backrest can provide force for the waist to ensure the correct sitting posture of the human body, and the effects of myopia prevention and humpback prevention are effectively achieved.

2, the bracket is connected below the base and is positioned at the rear end of the base; the first pin shaft is positioned at the center position below the chair seat, namely when the chair is used, the first pin shaft is positioned near the position below the gravity center of a human body; then when the position of the gravity center of the human body on the chair is changed, the seat and the back tilt synchronously; the change according to human focus corresponds the regulation for the result of use of seat is better, experiences and feels comfortable.

3, further, the first pin shaft is positioned near the gravity center of the human body, so that when the bracket rotates by taking the first pin shaft as a fulcrum, the gravity of the human body is applied near the fulcrum, and the force arm is smaller; the bracket can not be easily tilted, and the shaking sense of the rotation of the chair seat is avoided; thereby making the rotation of the chair seat more gentle and the use more stable.

4, the first pin shaft is positioned at the front end of the bracket, namely the length of the first lever is far less than that of the second lever; in the process that the bracket rotates by taking the first pin shaft as a fulcrum, the range of the up-down tilting height of the front end part of the first lever is far smaller than the range of the up-down tilting height of the rear end part of the second lever, so that the up-down tilting height of the front end of the chair seat is not too large, and the comfort of a human body in use is prevented from being influenced;

5, the seat and back synchronous inclining structure of the chassis mainly inclines and inclines the seat and the back of the chair through the self weight of the human body; when the return is performed, the return is performed mainly by the gravity of the human body; so that people with light or heavy weight can easily lean forwards or backwards; the application range is wider and the application range is wider.

Drawings

Fig. 1 is a schematic perspective view of a chassis according to an embodiment of the present invention;

fig. 2 is a schematic perspective view of another angle of the chassis according to the embodiment of the present invention;

fig. 3 is an exploded view of the chassis in an embodiment of the present invention;

fig. 4 is a schematic perspective view illustrating the bracket of the present invention without rotating in the embodiment;

fig. 5 is a schematic perspective view illustrating a tilting back of the bracket according to an embodiment of the present invention;

fig. 6 is a schematic perspective view illustrating the forward tilting of the bracket according to the embodiment of the present invention;

fig. 7 is a schematic diagram illustrating the movement of the bracket rotating around the first rotating shaft as a pivot according to the embodiment of the present invention;

fig. 8 is a schematic perspective view of a bracket according to an embodiment of the present invention;

fig. 9 is a schematic perspective view of a base according to an embodiment of the present invention;

fig. 10 is a schematic perspective view of a seesaw according to an embodiment of the present invention;

fig. 11 is a schematic perspective view of a seat according to an embodiment of the present invention;

fig. 12 is a schematic view of the present invention showing a human body leaning backward using the chair;

fig. 13 is a schematic view of the seat leaning forward according to the embodiment of the present invention.

The figures are numbered: a base 1; a bracket 2; a seesaw 3; a first pin 4; a first lever A; a second lever B; a front end point c; a rear end point d; a pallet 5; a front connecting plate 6; a bottom plate 7; a support plate 8; a convex cap 9; a second pin 10; a mounting plate 11; side plates 12; a link mechanism 13; a third pin 14 a; the rail groove 14 b; a rear connecting plate 15; a spring 16; a mounting seat 17; a locking mechanism 18; a lock hole 19; a plug pin 20; an insertion hole 21; a chair leg 22; a seat 23; a chair back 24; a connecting rod 25; and a mounting hole 26.

Detailed Description

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

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

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

The present embodiment relates to reference orientations of respective parts, such as front, rear, and the like, which are described in a normal use state after a user is seated.

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

as shown in fig. 1-10, the present invention provides a chassis mechanism of a chair, which comprises a base 1, a bracket 2 and a seesaw 3.

As shown in fig. 2-10, the rocker 3 and the base 1 are both located below the bracket 2, the base 1 is located in the bracket 2, and the first pin 4 is inserted between the front end of the bracket 2 and the front end of the base 1, so that the bracket 2 can rotate around the base 1 around the first pin 4 as a fulcrum, specifically: as shown in fig. 6, the bracket 2 includes a supporting plate 5, and front connecting plates 6 extend downwards from two sides of the front end of the supporting plate 5; as shown in fig. 7, the base 1 includes a bottom plate 7 and support plates 8 extending upward in a vertical direction along left and right sides of the bottom plate 7; during installation, the base 1 is placed in the bracket 2, so that the two support plates 8 are positioned between the two front connecting plates 6; the first pin shaft 4 is a whole long shaft, the first pin shaft 4 penetrates through one side of the bracket 2, and the first pin shaft 4 penetrates through the front connecting plate 6 and the supporting plate 8 in sequence and then penetrates out of the other side of the bracket 2; namely, the bracket 2 can rotate around the base through the first pin shaft 4; and the two ends of the first pin shaft 4 are respectively provided with a convex cap 9, so that the first pin shaft 4 can not be separated from the bracket 2.

As shown in fig. 4-7, the bracket 2 is located at the front end portion of the first pin 4 to form a first lever a, and the bracket 2 is located at the rear end portion of the first pin 4 to form a second lever B; in the initial position, the bracket 2 is in a horizontal state; the bracket 2 has a forward tilting state and a backward tilting state, and as shown in fig. 7, when the bracket 2 tilts forward, the first lever A tilts downward, the second lever B tilts upward, the point c of the front end point of the bracket descends, and the point d of the rear end point of the bracket ascends; when the bracket 2 tilts backwards, the first lever A tilts upwards, the second lever B tilts downwards, the point c of the front end point of the bracket descends, and the point d of the rear end point of the bracket ascends.

As shown in fig. 2-7, the rocker 3 is located at the rear end of the base 1, and a second pin 10 penetrates between the front end of the rocker 3 and the rear end of the base 1, so that the rocker 3 can rotate back and forth around the base 1 by using the second pin 10 as a rotating shaft; specifically, the method comprises the following steps: as shown in fig. 9, the rocker 3 includes a mounting plate 11, and side plates 12 respectively extending upward along left and right sides of the mounting plate 11; the supporting plates 8 on the two sides of the base 1 are positioned between the two side plates 12, and the second pin shaft 10 is also a whole long shaft; a second pin shaft 10 penetrates through one side of the rocker 3, sequentially penetrates through the side plate 12 and the support plate 8, and then penetrates out of the other side of the rocker 3; namely, the rocker 3 can rotate around the base 1 through the second pin 10; and the two ends of the second pin shaft 10 are also respectively provided with a convex cap 9, so that the second pin shaft 10 can not be separated from the rocker 3.

In addition, a linkage mechanism 13 is further arranged between the rear end of the bracket 2 and the rear end of the rocker 3, and the linkage mechanism 13 comprises a third pin 14a penetrating through the bracket 2 and the rocker 3 and a track groove 14b for guiding the motion track of the rocker 3; the third pin 14a is inserted into the track groove 14b, and slides along the track groove 14b through the third pin 14a to act on the rocker 3, so that the rocker 3 will synchronously rotate around the base 1 while the bracket 2 rotates around the base 1. Specifically speaking: two sides of the rear end of the supporting plate 5 are respectively extended downwards to form rear connecting plates 15 matched with the third pin shafts 14 a; the two side plates 12 of the rocker 3 are positioned between the two rear connecting plates 15; the track groove 14b is arranged at a corresponding position of the side plate 12, and the track groove 14b inclines towards the direction close to the base 1 from top to bottom; the third pin shaft 14a penetrates into the bracket 2 and the rocker 3 from one side, and the third pin shaft 14a penetrates out from the other side after sequentially penetrating through the rear connecting plate 14 and the track groove 14 b; the convex caps 9 are arranged at the two ends of the third pin shaft 14a, so that the third pin shaft 14a cannot be separated from the wane 3; when the second lever B at the rear end of the bracket 2 is tilted upwards or downwards, the third pin 14a will follow to rise or fall, that is, when the bracket 2 tilts forwards, the height of the third pin 14a will be higher than that of the first pin 4; the third pin 14a will be at a lower height than the first pin 4 when the bracket 2 is tilted backwards.

As shown in fig. 4-7, when the bracket 2 rotates back and forth around the base 1 with the first pin 4 as a fulcrum, the third pin 14a follows the rotation of the bracket 2 to ascend or descend, so that the third pin 14a slides along the track of the track groove 14b to act on the rocker 3 to make the rear end of the rocker 3 rotate around the base 1 synchronously; specifically, the method comprises the following steps: as shown in fig. 3, the chassis is at the initial position, and the pallet 5 is at the horizontal position; when the bracket 2 tilts backwards, the bracket 2 rotates backwards around the base 1, as shown in fig. 4, the third pin 14a rotates backwards along with the bracket 2, the third pin 14a slides along the track groove 14b, and the height of the third pin 14a decreases; the third pin 14a abuts against and acts on the track groove 14b, so that the rocker 3 rotates backwards around the base 1, namely, the rear end of the rocker 3 tilts downwards; when the third pin 14a abuts against the rearmost end of the track groove 14b, the rocker 3 cannot rotate backward, which is the maximum angle of backward rotation of the rocker 3 and the bracket 2. When the bracket 2 tilts forward, the bracket 2 rotates forward around the base 1, as shown in fig. 5, the third pin 14a rotates forward along with the bracket 2, the third pin 14a slides along the track groove 14b and the height of the third pin 14a rises, and the third pin 14a then abuts against and acts on the track groove 14b, so that the rocker 3 rotates forward around the base 1, that is, the rear end of the rocker 3 tilts upward; when the third pin 14a is in contact with the rearmost end of the track groove 14b, the rocker 3 cannot rotate forward, which is the maximum angle of forward rotation of the rocker 3 and the bracket 2.

As shown in fig. 1 and 3, a spring 16 for returning the bracket 2 around the base 1 is further disposed on the first pin 4, and the spring 16 is a torsion spring; the spring 16 is sleeved on the first pin shaft 4; a mounting seat 17 is further arranged in the base 1, the mounting seat 17 is connected between the two supporting plates 8, and two torsion arms of the spring 16 are respectively abutted against the lower end of the mounting seat 17 and the lower end of the supporting plate 5; so that the spring 16 can provide an elastic force for the rotational return of the carriage 2 when the carriage 2 rotates around the base 1; and the spring 16 makes the bracket 2 have good damping sense in the rotation process, and effectively removes the problems of shaking, abnormal sound and the like caused by assembly clearance. In addition, a locking mechanism 18 for limiting the rotation of the bracket 2 is arranged between the bracket 2 and the base 1, and the locking mechanism 18 comprises a lock hole 19 and a bolt 20; the lock hole 19 is arranged on the support plate 8, and a jack 21 is arranged at the corresponding position of the front connecting plate 6 at the same side; when the lock is locked, the bolt 20 is inserted into the lock hole 19 through the insertion hole 21, so that the bracket 2 is limited to rotate around the base 1; so that the human body can stay at the position of any tilting angle of the bracket 2.

As shown in fig. 11-13, the present invention further provides a chair, which comprises a leg support assembly 22, a seat 23, a back 24 and a chassis mechanism of the chair, wherein the base 1 is provided with a mounting hole 26, and the base 1 is fixedly connected to the leg support assembly 22 through the mounting hole 26; the supporting plate 5 on the bracket 2 is fixedly connected with the seat 23 through screws, and the bracket 2 is positioned at the rear end of the base 1; the first pin shaft 4 is positioned at the center of the lower part of the chair seat; a connecting rod 25 is arranged behind the chair back 24, and the connecting rod 25 is connected and fixed on the mounting plate 11 of the wane 3.

So that the seat 23 and the backrest 24 can rotate synchronously when the human body uses the chair to tilt; the method specifically comprises the following steps: as shown in fig. 11, when the human body tilts backwards, the seat 23 tilts backwards, and the backrest 24 tilts backwards synchronously to fit the waist of the human body; as shown in FIG. 12, when the person leans forward, the seat 23 tilts forward slightly, and the backrest 24 tilts forward synchronously to fit the waist of the person. In the using process of the chair, the chair seat 23 and the chair back 24 keep inclining synchronously, the chair back can be always attached to a human body, the supporting effect is provided, the comfort of the chair is improved, and the chair better accords with human engineering mechanics.

The first pin shaft 1 is arranged near the lower part of the gravity center of the human body, so that the chair seat 23 can be rotationally adjusted according to the gravity center change of the human body, the experience feeling is comfortable, and the effect is better; 4-7, the first pin 4 is located at the front end of the bracket 2, so that the length of the second lever B is much longer than that of the first lever A; namely, in the process that the bracket 2 rotates by taking the first pin shaft 4 as a fulcrum, the vertical tilting height range of the point c at the front end of the first lever A is far smaller than the vertical tilting height range of the point d at the rear end of the second lever B, so that the vertical tilting height of the front end of the seat 23 is not too large, and the comfort of a human body during use is prevented from being influenced; the first pin shaft 4 is positioned near the gravity center of the human body, so that when the bracket 2 rotates by taking the first pin shaft 4 as a fulcrum, the gravity of the human body is exerted near the fulcrum, and the force arm is smaller; the bracket 2 can not be easily tilted, and the shaking sense of the rotation of the chair seat is avoided; thereby making the rotation of the chair seat more gentle and the use more stable.

Claims (10)

1. The chassis mechanism of the seat is characterized by comprising a base, a bracket and a wane; a first pin shaft penetrates between the front end of the bracket and the front end of the base to enable the bracket to rotate around the base by taking the first pin shaft as a fulcrum; a second pin shaft penetrates between the front end of the rocker and the rear end of the base to enable the rocker to rotate around the base by taking the second pin shaft as a rotating shaft; a linkage structure is arranged between the rear end of the bracket and the rear end of the wane, and comprises a third pin shaft and a track groove, wherein the third pin shaft is arranged on the bracket and the wane in a penetrating mode, and the track groove is used for guiding the motion track of the wane; the track grooves are formed in two sides of one of the wane or the bracket, and the third pin shaft penetrates through the track grooves; the bracket is positioned at the front end part of the first pin shaft to form a first lever, and the bracket is positioned at the rear end part of the first pin shaft to form a second lever; under the initial position, the bracket is in a horizontal state; the bracket has a forward tilting state and a backward tilting state, when the bracket tilts forward, the first lever tilts downwards, the second lever tilts upwards, and the third pin shaft slides along the track groove and acts on the wane so as to enable the rear end of the wane to tilt upwards synchronously; when the bracket tilts backwards, the first lever tilts upwards, the second lever tilts downwards, and the third pin shaft slides along the track groove and acts on the wane, so that the rear end of the wane tilts downwards synchronously.

2. The chassis mechanism of a seat according to claim 1, wherein: the second lever is longer than the first lever; in the forward tilting or backward tilting process of the bracket, along the height direction, the movement stroke of the front end of the first lever is smaller than the movement stroke of the rear end of the second lever.

3. The chassis mechanism of a seat according to claim 1, wherein: when the bracket tilts forwards, the height of the third pin shaft is higher than that of the first pin shaft; when the bracket tilts backwards, the height of the third pin shaft is lower than that of the first pin shaft.

4. The chassis mechanism of a seat according to claim 1, wherein: the track grooves are symmetrically arranged on two sides of the rear end of the wane and are inclined towards the direction close to the base from top to bottom.

5. The chassis mechanism of a seat according to claim 1, wherein: the base comprises a bottom plate and supporting plates which extend upwards along the vertical direction along the left side and the right side of the bottom plate; the bracket comprises a supporting plate, and front connecting plates matched with the first pin shafts respectively extend downwards from two sides of the front end of the supporting plate; the supporting plate is positioned between the two front connecting plates, and two ends of the first pin shaft respectively penetrate through the supporting plate and the front connecting plates in sequence.

6. The chassis mechanism of a seat according to claim 5, wherein: the wane comprises side plates arranged at left and right intervals and a mounting plate connected to the bottoms of the two side plates; the supporting plate is positioned between the two side plates, and two ends of the second pin shaft respectively penetrate through the supporting plate and the side plates in sequence.

7. The chassis mechanism of a seat according to claim 6, wherein: the track groove is arranged at the rear end of the side plate; two sides of the rear end of the supporting plate respectively extend downwards to form rear connecting plates matched with a third pin shaft, and the two side plates are positioned between the rear connecting plates on the left side and the right side; two ends of the third pin shaft respectively penetrate through the track groove and the rear connecting plate in sequence.

8. The chassis mechanism of a seat according to claim 1, wherein: the first pin shaft is provided with a spring for the bracket to rotate and reset, the spring is a torsion spring, the torsion spring is sleeved on the first pin shaft, and two torsion arms of the torsion spring are respectively abutted against the bracket and the base.

9. A seat, characterized by: a chassis mechanism comprising a leg support assembly, a seat, a backrest, and a seat as claimed in any one of claims 1 to 8, the base being connected to the leg support assembly, the backrest being connected to the rocker, the seat being connected to the bracket; the bracket is connected below the base and is positioned at the rear end of the base; the first pin shaft is positioned at the center of the lower part of the chair seat; when the bracket tilts forward, the chair seat tilts forward relative to the chair leg supporting components, and the chair back tilts backward synchronously; when the bracket tilts backwards, the chair seat tilts backwards relative to the chair leg supporting components, and the chair back tilts forwards synchronously.

10. The seat according to claim 9, wherein: the chair back and the wane are connected with a connecting rod, and the wane rotates around the base and acts on the chair back to enable the chair back to tilt.

Images