CN117016997A - Seat chassis with seat back linkage - Google Patents

Abstract

The application provides a seat chassis with a seat back linkage, which comprises a base, a back connecting piece, a seat connecting piece, an auxiliary piece back connecting piece and an auxiliary piece, wherein the auxiliary piece is rotationally connected with the seat connecting piece, the auxiliary piece is rotationally connected with the back connecting piece, the auxiliary piece is connected with the back connecting piece through a sliding groove and a sliding rotating piece, and the seat connecting piece is connected with the base through a guide groove; the rotary connection point of the auxiliary piece and the base is positioned behind the rotary connection point of the back connecting piece and the base; the rotary connection point of the auxiliary piece and the seat connecting piece is positioned above the sliding rotary piece, and the guide groove is inclined downwards from front to back; when the back of the chair is leaned back, the back connecting piece rotates relative to the base, the back connecting piece drives the auxiliary piece to rotate through the sliding rotating piece and the sliding groove, the auxiliary piece drives the seat connecting piece to move relative to the base, and the seat connecting piece moves backwards and downwards and leans backwards at the same time; the application simplifies the structure, is convenient for assembly, has good effect of relieving back rubbing sense, does not press thighs, effectively supports the waist of a human body and improves the use comfort.

Description

Seat chassis with seat back linkage

Technical Field

The application relates to the field of furniture, in particular to a seat chassis with a seat back linked.

Background

The seat chassis, also known as a swivel chair tray, is an important component that is mounted below the seat of the chair; the lifting of the chair seat and the adjustment of the tilting angle of the chair back are all completed by the chassis. The prior common seat chassis consists of a base, a seat connecting piece, a back connecting piece, a spring device and other parts, wherein the back connecting piece is arranged at the rear end of the base and can rotate relative to the base, and the seat connecting piece is arranged at the upper end of the base; the chair seat is connected with the seat connecting piece, and the back connecting piece is connected with the chair back; the spring device adopts a torsion spring or a pressure spring and acts on the back connecting piece; when a user leans up against the chair back, the torsion spring or the pressure spring can provide a leaning force so that the chair back can be actively reset.

The motion relation between the chair back and the chair seat is affected by the chair chassis, so that the use comfort of the chair is further affected, and the upward friction force of the chair back to the back of a human body is generated in the process of falling down of the chair chassis backrest, so that the clothes of a user can be pulled up, namely the so-called back rubbing, and the comfort of the user is affected; the existing part of seat chassis is structurally optimized for the back rubbing problem, most of the seat chassis is characterized in that a seat base moves along with the movement of a seat back, and the relative displacement between the seat back and the seat base is reduced, so that the back rubbing sense is lightened; the chassis of these back linkages, however, has several problems:

1. the chassis has complex internal structure, complex assembly and low production efficiency, such as CN202120083679.0;

2. when the chair is turned back, the front end of the chair seat is excessively jacked, and the jacked position just presses thighs, so that legs are tingled, and the use comfort is greatly reduced, such as CN200980100707.7;

3. the travel of the chair seat along with the movement of the chair back is short, and the effect is poor, such as patent CN202210991069.X;

4. when the back of the chair is leaned back, the gap between the chair seat and the chair back is overlarge, the waist of the human body is suspended, the chair back loses the support to the waist of the human body, the comfort is reduced, and the health of the waist and the back is affected, such as CN201820729468.8.

Disclosure of Invention

In order to solve the technical problems, the application provides a seat chassis with a seat back linkage, which comprises a base, a back connecting piece, a seat connecting piece, an auxiliary piece back connecting piece and an auxiliary piece, wherein the auxiliary piece back connecting piece and the auxiliary piece are all rotationally connected to the base; the rotary connection point of the auxiliary piece and the base is positioned behind the rotary connection point of the back connecting piece and the base; the rotary connection point of the auxiliary piece and the seat connecting piece is positioned above the sliding rotary piece and the chute, and the guide groove is obliquely arranged from front to back and downwards; when the back of the chair is leaned back, the back connecting piece rotates relative to the base, the back connecting piece drives the auxiliary piece to rotate relative to the base through the sliding rotating piece and the sliding groove, the auxiliary piece drives the seat connecting piece to move relative to the base, and the seat connecting piece moves backwards and downwards and leans backwards; the application simplifies the structure, is convenient for assembly, has good effect of relieving back rubbing sense, does not press thighs, effectively supports the waist of a human body, and improves the use comfort.

The technical scheme of the application is realized as follows:

a seat pan for seatback linkage, comprising:

a base configured to support a main body of the seat pan;

a back connector configured to connect to a back of the chair; the back connecting piece is rotatably arranged on the base;

the front part of the seat connecting piece is connected with the base through the guide groove and the guide piece, and the rear part of the seat connecting piece is rotationally connected with the auxiliary piece;

the auxiliary piece is rotationally connected to the base, the upper part of the auxiliary piece is rotationally connected with the seat connecting piece, and the lower part of the auxiliary piece is connected with the back connecting piece through the sliding rotating piece and the sliding chute;

when the back of the chair is leaned back, the back connecting piece rotates relative to the base, the back connecting piece drives the auxiliary piece to rotate relative to the base through the sliding rotating piece and the sliding groove, the auxiliary piece drives the seat connecting piece to move relative to the base, and the seat connecting piece moves backwards and downwards and leans backwards;

the rotary connection point of the auxiliary piece and the base is positioned behind the rotary connection point of the back connecting piece and the base;

the rotating connection point of the auxiliary piece and the seat connecting piece is positioned above the sliding rotating piece and the chute;

the guide groove is obliquely arranged from front to back and downwards.

The rotating connection point of the back connecting piece and the base is a point A, the rotating connection point of the auxiliary piece and the base is a point B, the rotating connection point of the back connecting piece and the auxiliary piece is a point C, and the rotating connection point of the auxiliary piece and the base connecting piece is a point D; the relative position relation between the point A and the point B enables the rotation travel of the auxiliary piece to be larger, the travel of the seat connecting piece to be larger, and the effect of reducing back rubbing feeling to be better; when the auxiliary piece drives the seat connecting piece to rotate, the point D can drive the seat connecting piece to move downwards and can drive the seat connecting piece to move backwards, so that the seat is enabled to move in a manner of adapting to the chair back, the seat connecting piece is more in accordance with ergonomics, and is matched with the guide groove to move on the base in a preset track, the whole seat connecting piece moves downwards and backwards and leans backwards, the backward leaning angle is gentle, the thighs are prevented from being pressed, the seat is prevented from moving backwards to be close to the chair back, and the too large gap between the seat and the chair back is prevented from losing the support on the waist of a human body; and this chassis simple structure, it is convenient to assemble, and production efficiency is also higher.

Preferably, the guide groove is an arc groove bent obliquely upward and rearward. The arrangement can keep the front part of the seat connecting piece slowly descends, so the front part of the seat can be positioned at a high position relative to the rear part of the seat, the back elevation angle of the seat is ensured, the ergonomics are met, and the sitting comfort is kept.

Preferably, the guide member is a rotating shaft, the guide member is arranged left and right and fixedly connected to the seat connecting member, and the guide member is inserted into the guide groove. The guide piece is a rotating shaft, so that the guide piece can rotate in the guide groove and move along the guide groove, and the seat connecting piece can integrally rotate and displace relative to the base.

Preferably, the sliding rotating piece comprises a sliding block and a rotating shaft, the sliding block is arranged in the sliding groove and is in sliding fit with the sliding groove, and the rotating shaft is inserted into the sliding block and is in rotating fit with the rotating shaft. Because auxiliary member and back connecting piece all rotate to be connected on the base, lean on rotating between back connecting piece and the auxiliary member to be connected can not make both rotate on the base jointly, consequently still need spout and slider's cooperation to realize when back connecting piece rotates for the base, can drive the auxiliary member rotation of likewise rotating connection on the base.

Preferably, the slider is a rectangular block. The sliding block is only in sliding fit with the sliding groove, the sliding block and the sliding groove are not rotated, but the sliding block and the rotating shaft can rotate, so that the auxiliary piece and the back connecting piece can rotate relatively.

Preferably, the auxiliary piece comprises a connecting part and a shielding part, wherein the connecting part is positioned in front of the shielding part and integrally formed with the shielding part, the front end of the connecting part is rotationally connected with the base, the lower end part of the shielding part is provided with a sliding groove, and the upper end part of the shielding part is rotationally connected with the seat connecting piece.

Preferably, a gap is formed between the seat connecting piece and the back connecting piece, and the length of the shielding part in the vertical direction is larger than the gap between the seat connecting piece and the back connecting piece; the shielding part is configured to shield a gap between the seat connector and the back connector. The chassis is kept integral and beautiful, and the clamping of the hand during the movement of the seat connecting piece and the back connecting piece is prevented.

Preferably, the base is also provided with a reset assembly, the reset assembly comprises two reset spring plates which are arranged in a vertically stacked manner, the reset spring plates are arranged in the base along the front-back direction, and the reset spring plates are configured to give the reset elastic force to the back connecting piece when the chair is leaned back; the back connecting piece is provided with a pressing rod which is horizontally arranged along the left-right direction, and the pressing rod is configured to be propped against the rear end part of the reset spring plate when the chair is bent back. The reset spring plate of the reset assembly can provide buffering force and reset elastic force when the back of the chair is leaned back, so that the user feels comfortable when the back of the human body is leaned back, and meanwhile, the chair back is reset when the user gets up.

Preferably, a gap is formed between the two reset spring plates, the rear ends of the two reset spring plates are propped against each other to form a movable adjusting fulcrum, the length of the reset spring plate positioned above is longer than that of the reset spring plate positioned below, and the movable adjusting fulcrum can move back and forth relative to the reset spring plate positioned above.

Preferably, the thickness of the return spring plate located above is greater than the thickness of the return spring plate located below.

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

the rotating connection point of the back connecting piece and the base is A point, the rotating connection point of the auxiliary piece and the base is B point, the rotating connection point of the back connecting piece and the auxiliary piece is C point, and the rotating connection point of the auxiliary piece and the base connecting piece is D point.

A. And B, the effect of the position relation of the two rotating points on the realization effect is influenced: the point B is positioned behind the point A, more precisely, the relative position relation between the point A and the point B is that the point B is positioned in a region in the diagram, the region is a circular region formed by connecting the midpoint of the movement track of the point C with the point A and taking the midpoint on the connecting line as the center of a circle and the distance from the center of the circle to the point A as the radius; when the point B is in the above region, the rotation stroke of the auxiliary member is larger than that of the back connecting member, and the auxiliary member can play an amplifying role, namely, the auxiliary member can give a larger movement stroke to the seat connecting member relative to the back connecting member.

Effect of point D on implementation effect: in this embodiment, the difference between the heights of the point C and the point a is small and almost horizontal, so when the chair is reclined, the back connecting member mainly rotates downward, and if the back connecting member and the seat connecting member are directly connected to the point C, the back connecting member cannot give the seat connecting member a backward movement; when the seat connecting piece is in backward leaning with the auxiliary piece at the point D, the movement track of the point D moves downwards and backwards as the point D is positioned above the point B, so that the displacement in the front-back direction generated by the auxiliary piece can effectively drive the seat connecting piece to move downwards and backwards, and the rear part of the seat is prevented from being far away from the chair back, so that the waist of a human body is suspended; if the auxiliary piece is canceled, the back connecting piece is directly connected with the seat connecting piece at the point D, the amplifying effect of the auxiliary piece is lost, the stroke of the seat connecting piece is reduced, and the effect in the scheme can not be achieved.

Influence of guide slot on realization effect: the seat connecting piece is not simply connected to the base in a rotating way, and is not connected with the base through a connecting rod positioned at the front part, because if the seat connecting piece is directly connected to the base in a rotating way, the whole seat connecting piece cannot move in the front-back direction, namely the seat cannot move towards the chair back, the interval between the seat and the chair back can be increased, the waist of a human body is suspended, the support of the chair back cannot be obtained, and the inclination angle of the seat is larger and thighs are pressed when the seat connecting piece rotates; if the seat connecting piece is connected with the base through the connecting rod at the front part, the front part of the seat connecting piece is easy to be lifted, and if the rear part of the seat connecting piece is in a descending motion, the front and rear inclination of the seat is obvious, and the front end of the seat can press thighs of a human body, so that the use comfort is affected; therefore, the guide piece on the seat connecting piece is connected with the base in a mode of being arranged in the guide groove, the guide piece can move and rotate in the guide groove, and the rear part of the seat connecting piece is rotationally connected with the auxiliary piece, so that the guide piece moves integrally relative to the base and can move and rotate, the movement stroke is large under the action of the auxiliary piece, the movement is gentle under the influence of the guide groove, and the inclination angle is small; the seat connecting piece can lean backwards to match the backward leaning of the chair back, the seat connecting piece can displace backwards and downwards to prevent the distance between the chair seat and the chair back from being overlarge, and the front part of the seat connecting piece can retract backwards and downwards while being upwarped, so that the chair seat is more gentle and the thighs of a user are prevented from being pressed; the guide groove can also enable the seat connecting piece to move according to a preset track, and finally the seat connecting piece reaches a required position.

The above points are buckled to comprehensively solve the technical problems; the relative position relation between the point A and the point B enables the rotation travel of the auxiliary piece to be larger, the travel of the seat connecting piece to be larger, and the effect of reducing back rubbing feeling to be better; when the auxiliary piece drives the seat connecting piece to rotate, the point D can drive the seat connecting piece to move downwards and can drive the seat connecting piece to move backwards, so that the seat is enabled to move in a manner of adapting to the chair back, the seat connecting piece is more in accordance with ergonomics, and is matched with the guide groove to move on the base in a preset track, the whole seat connecting piece moves downwards and backwards and leans backwards, the backward leaning angle is gentle, the thighs are prevented from being pressed, the seat is prevented from moving backwards to be close to the chair back, and the too large gap between the seat and the chair back is prevented from losing the support on the waist of a human body; and this chassis simple structure, it is convenient to assemble, and production efficiency is also higher.

Drawings

FIG. 1 is a schematic perspective view of a seat using the chassis in an embodiment of the present application;

FIG. 2 is a side view of an embodiment of the present application with the seat back upright;

FIG. 3 is a side view of the application with the seat reclined;

FIG. 4 is a schematic perspective view of the seat pan according to an embodiment of the application;

FIG. 5 is a cross-sectional view of the seat pan with the seatback upright in an embodiment of the present application;

FIG. 6 is a cross-sectional view of the seat pan with the seat reclined in an embodiment of the present application;

FIG. 7 is a schematic illustration of the movement of the seat pan in an embodiment of the application;

FIG. 8 is a schematic view of the present application with point B disposed within the illustrated region in an embodiment;

FIG. 9 is a schematic view showing the point B being located outside the illustrated area in the embodiment of the present application;

fig. 10 is an exploded view of the seat pan in an embodiment of the application.

The reference numerals are as follows: a base 1; a back connector 2; a seat connection 3; an auxiliary member 4; a connection portion 41; a shielding portion 42; a guide groove 5; a guide 6; a sliding rotary member 7; a slider 71; a rotating shaft 72; a chute 8; a seat 9; a seatback 10; a return spring plate 11; a compression bar 12.

Description of the embodiments

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

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

In the description of the present application, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The specific embodiments of the present application are as follows:

as shown in fig. 4-7 and 10, the present application provides a seat-back linkage seat chassis comprising:

a base 1 configured as a main body support of the seat pan;

a back link 2 configured to connect the seatback 10; the back connecting piece 2 is rotatably arranged on the base 1;

the front part of the seat connecting piece 3 is connected with the base 1 through a guide groove 5 and a guide piece 6, and the rear part of the seat connecting piece 3 is rotationally connected with the auxiliary piece 4;

the auxiliary piece 4 is rotationally connected to the base 1, the upper part of the auxiliary piece 4 is rotationally connected with the seat connecting piece 3, and the lower part of the auxiliary piece 4 is connected with the back connecting piece 2 through the sliding rotating piece 7 and the sliding chute 8;

when the chair back 10 is reclined, the back connecting piece 2 rotates relative to the base 1, the back connecting piece 2 drives the auxiliary piece 4 to rotate relative to the base 1 through the sliding rotating piece 7 and the sliding chute 8, the auxiliary piece 4 drives the seat connecting piece 3 to move relative to the base 1, and the seat connecting piece 3 moves backwards and downwards and tilts backwards;

the rotary connection point of the auxiliary piece 4 and the base 1 is positioned behind the rotary connection point of the back connecting piece 2 and the base 1;

the rotating connection point of the auxiliary piece 4 and the seat connecting piece 3 is positioned above the sliding rotating piece 7 and the chute 8;

the guide groove 5 is inclined downwards from front to back.

The rotating connection point of the back connecting piece 2 and the base 1 is the point A, the rotating connection point of the auxiliary piece 4 and the base 1 is the point B, the rotating connection point of the back connecting piece 2 and the auxiliary piece 4 is the point C, and the rotating connection point of the auxiliary piece 4 and the base connecting piece 3 is the point D. In this embodiment, as shown in fig. 7, the rotational travel of the back link 2 is 22 ° and the rotational travel of the auxiliary member 4 is 29 °.

A. And B, the effect of the position relation of the two rotating points on the realization effect is influenced: 7-9, the relative position relation between the point A and the point B is that, as shown in fig. 8 and 9, the point B is in the illustrated region, the region is a circular region formed by connecting the midpoint of the movement track of the point C with the point A, taking the midpoint on the connecting line as the center of a circle and taking the distance from the center of the circle to the point A as the radius; when the point B is in the above-mentioned region, the rotational travel of the auxiliary element 4 will be greater than the rotational travel of the back-connector 2, and the auxiliary element 4 will only be able to amplify, i.e. the auxiliary element 4 will be able to give a greater travel to the seat-connector 3 with respect to the back-connector 2.

Effect of point D on implementation effect: in this embodiment, the difference between the heights of the point C and the point a is small, and is almost horizontal, so when the chair back 10 leans back, the back connecting piece 2 mainly rotates downward, and if the back connecting piece 2 and the seat connecting piece 3 are directly connected to the point C, the back connecting piece 2 cannot give the seat connecting piece 3 a backward movement displacement; the seat connecting piece 3 is connected with the auxiliary piece 4 at the point D, when the chair back 10 leans back, the point D is positioned above the point B, and the movement track of the point D moves downwards and backwards, so that the displacement in the front-back direction generated by the auxiliary piece 4 can effectively drive the seat connecting piece 3 to move downwards and backwards, and the rear part of the chair seat 9 is prevented from being far away from the chair back 10 to suspend the waist of a human body; if the auxiliary member 4 is canceled, the back connecting member 2 is directly connected with the seat connecting member 3 at the point D, the amplifying effect of the auxiliary member 4 is lost, the stroke of the seat connecting member 3 is reduced, and the effect in the scheme cannot be achieved.

Influence of the guide groove 5 on the realization effect: the seat connecting piece 3 is not simply connected to the base 1 in a rotating way, and is not connected to the base 1 through a connecting rod positioned at the front part, because if the seat connecting piece 3 is directly connected to the base 1 in a rotating way, the whole seat connecting piece 3 cannot be displaced in the front-back direction, namely, the seat 9 cannot move towards the chair back 10, the interval between the seat 9 and the chair back 10 becomes large, the waist of a human body is suspended, the support of the chair back 10 cannot be obtained, and the inclination angle of the seat 9 is larger and the thighs are pressed when the seat connecting piece 3 rotates; if the seat connecting piece 3 is connected with the base 1 through the connecting rod at the front part, the front part of the seat connecting piece 3 is easy to be lifted, and if the rear part of the seat connecting piece 3 is in a height descending motion, the front and rear inclination of the seat 9 is obvious, and the front end of the seat 9 can press the thighs of a human body to influence the comfort of use; therefore, the guide piece 6 on the seat connecting piece 3 is arranged in the guide groove 5 to connect the seat connecting piece 3 with the base 1, the guide piece 6 can move and rotate in the guide groove 5, and the rear part of the seat connecting piece 3 is rotationally connected with the auxiliary piece 4, so the guide piece 6 moves integrally relative to the base 1 and can move and rotate, the movement stroke is large under the effect of the auxiliary piece 4, the movement is gentle under the influence of the guide groove 5, and the inclination angle is small; the seat connecting piece 3 can lean backwards to match the backward leaning of the chair back 10, the seat connecting piece 3 moves backwards and downwards to prevent the distance between the chair seat 9 and the chair back 10 from being overlarge, and the front part of the seat connecting piece 3 can retract backwards and downwards while being upwarped, so that the chair seat 9 is more gentle and the thighs of a user are prevented from being pressed; the guide slot 5 also enables the seat connection 3 to move in a preset trajectory, eventually reaching the desired position.

The above points are buckled to comprehensively solve the technical problems; the relative position relation between the point A and the point B enables the rotation travel of the auxiliary piece 4 to be larger, and the travel of the seat connecting piece 3 to be larger, so that the effect of reducing the back rubbing feeling is better; when the auxiliary piece 4 drives the seat connecting piece 3 to rotate, the point D can drive the seat connecting piece 3 to move downwards and drive the seat connecting piece 3 to move backwards, so that the seat 9 moves to adapt to the chair back 10, the seat connecting piece 3 moves on the base 1 along a preset track through the cooperation of the guide piece 6 and the guide groove 5, the whole seat connecting piece 3 moves downwards and backwards and leans backwards, the backward leaning angle is gentle, the thighs are prevented from being pressed, the seat connecting piece 3 moves backwards to be close to the chair back 10, the gap between the seat 9 and the chair back 10 is prevented from being overlarge, and the support on the waist of a human body is lost; and this chassis simple structure, it is convenient to assemble, and production efficiency is also higher.

In particular, as shown in fig. 1-3, the chassis is used in a seat comprising a seat 9, a back 10, and the seat chassis described above, the seat 9 being mounted to the seat attachment 3 and the back 10 being mounted to the back attachment 2.

As shown in fig. 4-7 and 10, the base 1 is a half-open shell, the inside of the shell is hollow, the back connecting piece 2 is connected with the middle lower part of the base 1 in a rotating way, and the back connecting piece 2 rotates behind the base 1; the seat connecting piece 3 is positioned above the base 1; the seat connecting piece 3 and the back connecting piece 2 are provided with gaps at the left side, the right side and the back side; the auxiliary piece 4 comprises a connecting part 41 and a shielding part 42, wherein the connecting part 41 is positioned in front of the shielding part 42 and is integrally formed with the shielding part 42; the front end of the connecting part 41 is rotationally connected with the base 1, the connecting part 41 is positioned between the base 1 and the back connecting piece 2, the back connecting piece 2 shields the connecting part 41, the shielding part 42 is partially exposed at a gap between the back connecting piece 2 and the seat connecting piece 3, and the length of the shielding part 42 in the vertical direction is longer than the gap between the seat connecting piece 3 and the back connecting piece 2; the shielding part 42 is configured to shield gaps between the seat connector 3 and the back connector 2 on the left side, the right side and the back side, so that the chassis integrity and the attractiveness are maintained; when the chair back 10 is reclined, the back connecting piece 2 and the seat connecting piece 3 are linked, and move relative to the base 1, meanwhile, the gap between the back connecting piece and the seat connecting piece is reduced, and the shielding part 42 can prevent the seat connecting piece 3 and the back connecting piece 2 from clamping hands during movement; in addition, the lower end of the shielding part 42 is provided with the sliding chute 8 and is connected with the back connector 2 through the sliding rotating member 7, and the upper end plate of the shielding part 42 is rotatably connected with the seat connector 3.

The left and right sides of the base 1 are provided with the guide grooves 5, the guide grooves 5 are arc grooves which are bent obliquely upwards and backwards, the guide piece 6 is a rotating shaft 72, the guide piece 6 is arranged leftwards and rightwards and is fixedly connected with the front part of the seat connecting piece 3, the guide piece 6 is inserted into the guide grooves 5, and the guide piece 6 can rotate in the guide grooves 5 and can move along the guide grooves 5, so that the seat connecting piece 3 can rotate and displace integrally relative to the base 1; the shape of the guide groove 5 can keep the front part of the seat connecting piece 3 slowly descending, so the front part of the seat 9 can be positioned at a high position relative to the rear part of the seat 9, the rear elevation angle of the seat 9 is ensured, the ergonomics are met, and the sitting comfort is kept.

The sliding rotating piece 7 comprises a sliding block 71 and a rotating shaft 72, the sliding block 71 is arranged in the sliding groove 8 and is in sliding fit with the sliding groove 8, the rotating shaft 72 is inserted into the sliding block 71 and is in rotating fit with the rotating shaft 72, and as the auxiliary piece 4 and the back connecting piece 2 are both rotationally connected to the base 1, the back connecting piece 2 and the auxiliary piece 4 cannot rotate on the base 1 together due to the fact that the back connecting piece 2 and the auxiliary piece 4 are rotationally connected, the sliding groove 8 and the sliding block 71 are matched, and therefore when the back connecting piece 2 rotates relative to the base 1, the auxiliary piece 4 which is rotationally connected to the base 1 can be driven to rotate; the sliding block 71 is a rectangular block, the shape of the sliding groove 8 is matched with that of the sliding block 71, the sliding block 71 is only in sliding fit with the sliding groove 8, and the sliding block 71 and the sliding groove 8 do not rotate, but the sliding block 71 and the rotating shaft 72 can rotate, so that the auxiliary piece 4 and the back connecting piece 2 can rotate relatively.

The base 1 is also provided with a reset assembly, the reset assembly comprises two reset spring plates 11 which are arranged in a vertically stacked mode, the reset spring plates 11 are arranged in the base 1 along the front-back direction, and the reset spring plates 11 are configured to give an elastic force for resetting the back connecting piece 2 when the chair back 10 is leaned backwards; the back connecting piece 2 is provided with a pressing rod 12, the pressing rod 12 is horizontally arranged along the left-right direction, and the pressing rod 12 is configured to be propped against the rear end part of the reset spring plate 11 when the chair back 10 is leaned back; a gap is reserved between the two reset spring plates 11, the rear ends of the two reset spring plates 11 are propped against each other to form a movable adjusting fulcrum, the length of the reset spring plate 11 positioned above is longer than that of the reset spring plate 11 positioned below, and the movable adjusting fulcrum can move back and forth relative to the reset spring plate 11 positioned above; the thickness of the return spring plate 11 located above is greater than the thickness of the return spring plate 11 located below.

The reset spring plate 11 of the reset assembly can provide buffering force and reset elastic force when the chair back 10 is reclined, so that the user feels comfortable when the user falls backwards, and the chair back 10 is reset when the user rises; the two reset spring plates 11 are arranged in a stacked manner, the two reset spring plates can be mutually matched in a assisted manner, and the elastic change of the two reset spring plates 11 is always not different from the thrust change exerted on the chair back 10 by a user in the whole reclining process of the user, namely, the elastic change after the two reset spring plates 11 are combined is always in the range accepted by the user; the user can always obtain proper tilting elasticity and feel comfortable in the tilting process.

Claims (10)

1. A seat back linkage seat pan comprising:

a base configured to support a main body of the seat pan;

a back connector configured to connect to a back of the chair; the back connecting piece is rotatably arranged on the base;

the front part of the seat connecting piece is connected with the base through the guide groove and the guide piece, and the rear part of the seat connecting piece is rotationally connected with the auxiliary piece;

the auxiliary piece is rotationally connected to the base, the upper part of the auxiliary piece is rotationally connected with the seat connecting piece, and the lower part of the auxiliary piece is connected with the back connecting piece through the sliding rotating piece and the sliding chute;

when the back of the chair is leaned back, the back connecting piece rotates relative to the base, the back connecting piece drives the auxiliary piece to rotate relative to the base through the sliding rotating piece and the sliding groove, the auxiliary piece drives the seat connecting piece to move relative to the base, and the seat connecting piece moves backwards and downwards and leans backwards;

the rotary connection point of the auxiliary piece and the base is positioned behind the rotary connection point of the back connecting piece and the base;

the rotating connection point of the auxiliary piece and the seat connecting piece is positioned above the sliding rotating piece and the chute;

the guide groove is obliquely arranged from front to back and downwards.

2. The seatback-linked seat chassis of claim 1, wherein: the guide groove is an arc-shaped groove which is bent obliquely upwards and backwards.

3. The seatback-linked seat chassis of claim 1, wherein: the guide piece is a rotating shaft, is arranged left and right and fixedly connected to the seat connecting piece, and is inserted into the guide groove.

4. The seatback-linked seat chassis of claim 1, wherein: the sliding rotating piece comprises a sliding block and a rotating shaft, the sliding block is arranged in the sliding groove and is in sliding fit with the sliding groove, and the rotating shaft is inserted into the sliding block and is in rotating fit with the rotating shaft.

5. The seatback-linked seat pan of claim 4, wherein: the sliding block is a rectangular block body.

6. The seatback-linked seat chassis of claim 1, wherein: the auxiliary piece comprises a connecting part and a shielding part, wherein the connecting part is positioned in front of the shielding part and integrally formed with the shielding part, the front end of the connecting part is rotationally connected with the base, the lower end of the shielding part is provided with a sliding groove, and the upper end of the shielding part is rotationally connected with the seat connecting piece.

7. The seatback-linked seat pan of claim 6, wherein: a gap is formed between the seat connecting piece and the back connecting piece, and the length of the shielding part in the vertical direction is larger than the gap between the seat connecting piece and the back connecting piece; the shielding part is configured to shield a gap between the seat connector and the back connector.

8. The seatback-linked seat chassis of claim 1, wherein: the base is also provided with a reset assembly, the reset assembly comprises two reset spring plates which are arranged in a vertically stacked manner, the reset spring plates are arranged in the base along the front-back direction, and the reset spring plates are configured to give an elastic force for resetting the back connecting piece when the back of the chair is leaned back; the back connecting piece is provided with a pressing rod which is horizontally arranged along the left-right direction, and the pressing rod is configured to be propped against the rear end part of the reset spring plate when the chair is bent back.

9. The seatback-linked seat pan of claim 8, wherein: the clearance is arranged between the two reset spring plates, the rear ends of the two reset spring plates are propped against each other to form a movable adjusting fulcrum, the length of the reset spring plate positioned above is longer than that of the reset spring plate positioned below, and the movable adjusting fulcrum can move back and forth relative to the reset spring plate positioned above.

10. The seatback-linked seat pan of claim 8, wherein: the thickness of the return spring plate located above is greater than the thickness of the return spring plate located below.