CN220327149U - Seat capable of adjusting lumbar support in seat depth direction - Google Patents

Abstract

The utility model provides a chair for adjusting a lumbar support in a seat depth direction, which comprises a lumbar support piece, a chair back and an adjusting component, wherein the lumbar support piece is arranged on the chair back through the adjusting component and is positioned in front of the chair back, the adjusting component comprises a first moving piece and a second moving piece, the adjusting component is in an initial state, when the lumbar support piece moves in the seat depth direction, the first moving piece and the second moving piece rotate along with the lumbar support piece and support the lumbar support piece to stay, the lumbar support piece, the chair back, the first moving piece and the second moving piece form a four-bar mechanism, so that the lumbar support piece can move relative to the chair back, and the lumbar support piece moves in the seat depth direction under the action of the adjusting component, thereby the lumbar support piece can support the lumbar of a human body in different seat depth positions and adapt to the conditions, especially the conditions that a user sits in the seat depth position of the chair when working.

Description

Seat capable of adjusting lumbar support in seat depth direction

Technical Field

The utility model relates to the field of furniture, in particular to a seat for adjusting lumbar support in the depth direction of the seat.

Background

With the rapid development of science and technology and the continuous increase of social pressure, health has become an important topic of increasing social concern. The technology releases the physical labor, but lets people fall into mental labor of sitting for a long time, which directly leads to the continuous increase of the number of groups sitting for a long time in China, the positions of buttocks of people sitting for a long time can be continuously adjusted to ensure the comfort of sitting feeling, and when a user works, the user sits at the first two thirds of the seat cushion for most of the time, and at the moment, the backrest cannot support the waist and the back of the user. With the increasing number of people, various age-related lumbar diseases are produced, which are caused by sedentary behavior.

Although the prior chair is added with the front convex lumbar support to provide lumbar support for a human body, the supporting effect is far insufficient, the lumbar support is often fixed with a chair back, so that the bearing position is fixed, a user can only give benign support when leaning back on the chair back, in many cases, the user can not keep the posture of leaning on the chair back, therefore, the application range is small, and the practicability is low; the waist rest of some chairs can be adjusted in height, so that the chair is suitable for people with different heights, and a user can adjust the waist rest to a comfortable position, but still cannot adjust the waist rest in the depth direction to adapt to the sitting postures of the human body under different use conditions; ultimately, there is a need for lumbar support that can be adjusted in the depth direction to address the problem of lumbar support in different use situations.

Disclosure of Invention

In order to solve the technical problems, the utility model provides a chair for adjusting a lumbar support in a depth direction, which comprises a lumbar support, a chair back and an adjusting component, wherein the lumbar support is arranged on the chair back through the adjusting component and is positioned in front of the chair back, the adjusting component comprises a first moving part and a second moving part, the adjusting component is in an initial state, when the lumbar support moves along the depth direction, the first moving part and the second moving part rotate along with the lumbar support and support the lumbar support to stay, the lumbar support, the chair back, the first moving part and the second moving part form a four-bar mechanism, so that the lumbar support can move relative to the chair back, and the lumbar support moves along the depth direction under the action of the adjusting component, thereby the lumbar support can support the lumbar of a human body at different depth positions and adapt to the conditions of the human body posture, especially the conditions that a user sits at the chair seat in the front position when working in a case.

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

a seat for adjusting a lumbar support in a depth direction comprises a lumbar support, a seat back and an adjusting assembly, wherein the lumbar support is arranged on the seat back through the adjusting assembly and positioned in front of the seat back; the adjusting component comprises a first moving piece and a second moving piece which are parallel to each other, the first moving piece and the second moving piece are arranged at intervals in the front-back direction, one end of the first moving piece and one end of the second moving piece are rotationally connected with the chair back, and the other end of the first moving piece and the other end of the second moving piece are rotationally connected with the waist supporting piece; the adjusting component is provided with an initial state, the first moving piece and the second moving piece are vertical in the initial state, the waist supporting piece is positioned at the rearmost position, and the seat is provided with the maximum seat depth; the adjusting assembly is configured such that when the lumbar support moves in the seat depth direction, the first moving member and the second moving member rotate with each other and support the lumbar support to stay.

The waist support piece, the chair back, the first moving piece and the second moving piece form a parallelogram four-bar mechanism, so that the waist support piece can move relative to the chair back, and the waist support piece moves along the depth direction of the seat under the action of the adjusting component, so that the waist support piece can support the waist of a human body at different depth positions, and the chair is suitable for the human body postures under different conditions, especially the conditions that a user sits at the position of the chair seat in front of a case work and the like; the first moving part and the second moving part are parallel to each other, so that the waist support part can keep the current direction movement, and the comfortable side always faces the waist of a human body, thereby realizing the adjustment of the waist support in the depth direction of the seat and simultaneously ensuring the comfort.

Preferably, an auxiliary spring is arranged between the first moving member and the second moving member, two ends of the auxiliary spring are respectively arranged on the first moving member and the second moving member, and the auxiliary spring is configured to provide a force for restoring the initial state for the adjusting assembly. The auxiliary spring can enable the first moving piece and the second moving piece to automatically return to the initial state of adjustment under the condition that a user does not apply force.

Preferably, the lower part of the first moving part is provided with a first connecting column protruding towards the second moving part, the upper part of the second moving part is provided with a second connecting column protruding towards the first moving part, two ends of the auxiliary spring are respectively sleeved on the first connecting column and the second connecting column, and when the waist supporting part moves forwards, the distance between the first connecting column and the second connecting column is increased, and the auxiliary spring stretches. The first moving part and the second moving part are two swing arms of a four-bar mechanism, the distance between the first connecting column and the second connecting column is increased when the first moving part and the second moving part rotate forwards, so that the auxiliary spring is lengthened, and the auxiliary spring stores elastic force for enabling the first moving part and the second moving part to return to an initial state.

Preferably, the adjusting assembly further comprises a mounting seat and a supporting assembly; the first moving part and the second moving part are arranged on the chair back through the mounting seat, the mounting seat is fixedly connected to the chair back, the first moving part and the second moving part are rotationally connected to the mounting seat, the supporting component is arranged between the mounting seat and the second moving part and comprises a meshing part and a clamping tongue, the meshing part is arranged on one of the mounting seat or the second moving part, and the clamping tongue is arranged on the other of the mounting seat or the second moving part; the engagement part is provided with first clamping teeth, the clamping tongue is provided with second clamping teeth, the first clamping teeth are selectively engaged with the second clamping teeth, the number of the first clamping teeth is more than that of the second clamping teeth, and when the waist support piece moves, the second clamping teeth are engaged with different first clamping teeth; the support assembly is configured to support the lumbar support in a post-motion position. The first moving part and the second moving part can stay after moving, and the waist supporting part can still stably support the waist of a human body after the seat depth is changed.

Preferably, the latch is further provided with a return spring, and the return spring is configured to give an elastic force to the engagement portion of the latch. The reset spring can enable the clamping tongue to push to the meshing part, so that the first clamping tooth and the second clamping tooth are meshed, and the first clamping tooth and the second clamping tooth can be separated when the first moving piece and the second moving piece rotate, and the second clamping tooth can be switched among different first clamping teeth.

Preferably, the chair back comprises a back frame and a support frame, wherein the back frame and the support frame are arranged up and down, and the back frame is connected above the support frame; the back frame comprises a connecting rod positioned at the lower end part, the connecting rod is horizontally arranged in the left-right direction, the upper ends of the first moving part and the second moving part are connected to the connecting rod, the lower ends of the first moving part and the second moving part are connected to the waist supporting part, and the lower ends of the first moving part and the second moving part are connected to the lower part of the waist supporting part. The lower ends of the first moving member and the second moving member are connected with the lower part of the lumbar support member, so that the overall height or the lowest height of the lumbar support member is not too low, and the lumbar support member is kept at a position approximate to the lumbar of a human body so as to provide effective lumbar support.

Preferably, the back frame and the support frame are integrally formed, and the back frame and the support frame are of a square frame structure.

Preferably, the distance between the two rotational connection points of the first moving member is equal to the distance between the two rotational connection points of the second moving member. The four-bar mechanism comprising the first moving part, the second moving part, the chair back and the waist support part is a parallelogram four-bar mechanism, so that the waist support part is unchanged in orientation, and the comfort of supporting the waist of a human body is maintained.

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

the waist support piece, the chair back, the first moving piece and the second moving piece form a parallelogram four-bar mechanism, so that the waist support piece can move relative to the chair back, and the waist support piece moves along the depth direction of the seat under the action of the adjusting component, so that the waist support piece can support the waist of a human body at different depth positions, and the chair is suitable for the human body postures under different conditions, especially the conditions that a user sits at the position of the chair seat in front of a case work and the like; the first moving part and the second moving part are parallel to each other, so that the waist support part can keep the current direction movement, and the comfortable side always faces the waist of a human body, thereby realizing the adjustment of the waist support in the depth direction of the seat and simultaneously ensuring the comfort.

Drawings

FIG. 1 is a schematic perspective view of a seat according to an embodiment of the present utility model in an initial state;

figure 2 is a side view of the lumbar support in an embodiment of the present utility model adjusted in the depth direction;

fig. 3 is a schematic perspective view of the seat after the lumbar support is moved forward in the embodiment of the present utility model;

fig. 4 is a schematic perspective view of an adjusting assembly and a lumbar support according to an embodiment of the present utility model;

fig. 5 is a schematic perspective view of an adjusting assembly and a lumbar support according to a second embodiment of the present utility model;

FIG. 6 is a schematic view of a parallelogram four-bar linkage constructed in an initial state in an embodiment of the present utility model;

FIG. 7 is a schematic view of a parallelogram four-bar linkage constructed after a lumbar support is advanced in an embodiment of the present utility model;

FIG. 8 is a cross-sectional view of FIG. 6;

FIG. 9 is a cross-sectional view of FIG. 7;

FIG. 10 is a cross-sectional view of the second latch disengaged from the first latch in an embodiment of the present utility model;

FIG. 11 is a cross-sectional view showing the return of the second mover in an embodiment of the present utility model;

figure 12 is an exploded view of the adjustment assembly and lumbar support in an embodiment of the present utility model;

FIG. 13 is a schematic perspective view of a mounting base according to an embodiment of the present utility model;

FIG. 14 is a schematic perspective view of a latch according to an embodiment of the present utility model;

fig. 15 is a schematic perspective view showing the installation of the reset slider into the engagement portion in the embodiment of the present utility model.

The reference numerals are as follows: a lumbar support 1; a chair back 2; a back frame 21; a connecting rod 211; a holder frame 22; an adjustment assembly 3; a first moving member 4; a first connection post 41; a second moving member 5; a second connection post 51; a slide groove 52; a relief hole 53; an engagement portion 6; a receiving groove 61; a first limiting surface 62; a second limiting surface 63; anti-rotation bumps 64; a clamping tongue 7; a head 71; a sliding portion 72; a stem 73; a first latch 8; a clamping groove 81; a sliding surface 811; a locking surface 812; a second latch 9; resetting the slider 10; clutch teeth 11; a mounting base 12; a mounting groove 121; anti-rotation groove 122; an auxiliary spring 13; a return spring 14; a boss 15.

Description of the embodiments

In order that the above-recited objects, features and advantages of the present utility model will be more clearly understood, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

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

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

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

as shown in fig. 1 to 3 and 8 to 12, the present utility model provides a seat for adjusting a lumbar support in a depth direction, and in particular, includes a lumbar support 1, a seat back 2, and an adjusting assembly 3, wherein the lumbar support 1 is mounted on the seat back 2 through the adjusting assembly 3 and is located in front of the seat back 2; the adjusting assembly 3 comprises a first moving piece 4 and a second moving piece 5 which are parallel to each other, the first moving piece 4 and the second moving piece 5 are arranged at intervals back and forth, one end of the first moving piece 4 and one end of the second moving piece 5 are rotationally connected with the chair back 2, and the other end of the first moving piece 4 and the other end of the second moving piece 5 are rotationally connected with the waist support piece 1; the adjusting component 3 has an initial state, wherein the first moving piece 4 and the second moving piece 5 are vertical in the initial state, the waist supporting piece 1 is positioned at the rearmost position, and the seat has the maximum seat depth; the adjusting assembly 3 is configured such that when the lumbar support 1 moves in the seat depth direction, the first moving member 4 and the second moving member 5 rotate therewith and support the lumbar support 1 to stay; specifically, the adjusting assembly 3 further includes a meshing portion 6 and a latch 7, the first moving member 4 and the second moving member 5 have a swing stroke in a front-rear direction, the meshing portion 6 is disposed on one of the seat back 2 or the second moving member 5, the latch 7 is slidably disposed on the other of the seat back 2 or the second moving member 5, the meshing portion 6 is provided with a plurality of first latches 8, and the latch 7 is provided with a second latch 9; when the first moving piece 4 and the second moving piece 5 move forwards, the first latch 8 and the second latch 9 are selectively meshed and in unidirectional abutting joint, so that the lumbar support 1 is prevented from moving backwards; the meshing part 6 is provided with a containing groove 61 with the same distribution direction as the first latch 8, a reset slide block 10 is arranged in the containing groove 61, the reset slide block 10 is rotatably arranged in the containing groove 61, and the reset slide block 10 and the second moving piece 5 coaxially rotate; the reset slide block 10 is provided with a clutch tooth 11, the accommodating groove 61 is provided with a first limiting surface 62 and a second limiting surface 63, when the first moving piece 4 and the second moving piece 5 reach the forefront of the swinging stroke, the second clamping tooth 9 is disengaged from the first clamping tooth 8 and is clamped with the clutch tooth 11, the reset slide block 10 is abutted against the first limiting surface 62 at the moment, the first limiting surface 62 prevents the reset slide block 10 from rotating towards the adjusting direction, and at the moment, the first moving piece 4 and the second moving piece 5 can swing backwards; when the first moving part 4 and the second moving part 5 swing backwards, the reset slide block 10 moves towards the second limiting surface 63 after leaving the first limiting surface 62, and the second latch 9 passes over the first latch 8; when the reset slide block 10 abuts against the second limiting surface 63, the second latch 9 is disengaged from the clutch tooth 11 and is meshed with the first latch 8 again, the adjusting assembly 3 returns to the initial state, and the lumbar support 1 returns to the rearmost position.

The waist support 1, the chair back 2, the first moving piece 4 and the second moving piece 5 form a parallelogram four-bar mechanism, so that the waist support 1 can move relative to the chair back 2, and the waist support 1 moves along the depth direction under the action of the moving support component; the selective engagement and one-way abutment of the first latch 8 with the second latch 9 allows the swinging rod to move in one direction relative to the base and resists movement of the swinging rod when there is a tendency to move in the other direction to provide support capability; after the clutch teeth 11 on the reset slide block 10 are clamped with the second clamping teeth 9, the second clamping teeth 9 are disengaged from the first clamping teeth 8, and the first clamping teeth 8 can not prevent the second clamping teeth 9 from moving in any direction, so that the second clamping teeth 9 can be reset; through lumbar support 1, back of the chair 2 and adjusting part 3, lumbar support 1 can be in the back of the chair direction self-loopa ground reciprocating motion to adjust to suitable front and back position, can support human waist in different seat deep positions, adapt to the human posture under different circumstances, especially the condition that user such as table work sits in the seat and leans on the front position.

The first moving part 4 and the second moving part 5 of the waist support part 1 are parallel to each other, so that the waist support part 1 can keep the current direction movement, and the comfortable side always faces the waist of a human body, thereby realizing the adjustment of the waist support in the depth direction of the seat and simultaneously ensuring the comfort.

Specifically, as shown in fig. 4 to 7, the chair back 2 includes a back frame 21 and a support frame 22, the back frame 21 is configured to support the waist of a human body, and is located above the support frame 22 and the lumbar support 1, and the support frame 22 is configured to be connected to the seat of the chair, and is located behind the lumbar support 1; the back frame 21 and the support frame 22 are integrally formed, and the back frame 21 and the support frame 22 are of a square frame structure; the back frame 21 and the support frame 22 are arranged up and down, and the back frame 21 is fixedly connected above the support frame 22; the back frame 21 comprises a connecting rod 211 positioned at the lower end part, the connecting rod 211 is horizontally arranged in the left-right direction, a mounting seat 12 is arranged on the connecting rod 211, the mounting seat 12 is arranged in the middle of the connecting rod 211 and protrudes downwards from the connecting rod 211, the upper ends of the first moving piece 4 and the second moving piece 5 are connected to the mounting seat 12, the lower ends of the first moving piece 4 and the second moving piece 5 are connected to the waist supporting piece 1, the lower ends of the first moving piece 4 and the second moving piece 5 are connected to the lower part of the waist supporting piece 1, and therefore the upper end of the waist supporting piece 1 is positioned near the connecting rod 211, so that the whole height or the lowest height of the waist supporting piece 1 is not too low, and the waist supporting piece 1 is kept at the position of the waist of a human body to provide effective waist supporting.

The engaging portion 6 and the second moving member 5 are arranged on the mounting seat 12 through a rotating shaft, as shown in fig. 13, a mounting groove 121 for mounting the engaging portion 6 is formed in the mounting seat 12, an anti-rotation protrusion 64 is formed at the upper end of the engaging portion 6, an anti-rotation groove 122 is correspondingly formed in the groove wall of the mounting groove 121, when the engaging portion 6 is mounted, the engaging portion 6 enters the mounting groove 121 from bottom to top, the anti-rotation protrusion 64 enters the anti-rotation groove 122, the anti-rotation protrusion 64 is a quadrangular prism, the shape of the anti-rotation groove 122 corresponds to that of the anti-rotation protrusion 64, and the engaging portion 6 and the mounting seat 12 are kept relatively stationary by cooperation of the anti-rotation groove 122 and the anti-rotation protrusion 64; the first moving part 4 is positioned in front of the second moving part 5, and the distance between two rotation connecting points of the first moving part 4 is equal to the distance between two rotation connecting points of the second moving part 5, so that the four-bar mechanism formed by the first moving part 4, the second moving part 5, the chair back 2 and the waist support part 1 is a parallelogram four-bar mechanism, the waist support part 1 is unchanged in orientation, and the comfort of supporting the waist of a human body is maintained.

As shown in fig. 8-11, an auxiliary spring 13 is arranged between the first moving member 4 and the second moving member 5, two ends of the auxiliary spring 13 are respectively arranged on the first moving member 4 and the second moving member 5, and the auxiliary spring 13 is configured to provide a force for restoring the initial state to the adjusting assembly 3; specifically, the lower part of the first moving member 4 is provided with a first connecting column 41 protruding towards the second moving member 5, the upper part of the second moving member 5 is provided with a second connecting column 51 protruding towards the first moving member 4, the auxiliary spring 13 is a tension spring, two ends of the auxiliary spring 13 are respectively sleeved on the first connecting column 41 and the second connecting column 51, when the waist support member 1 moves forwards, the four-bar mechanism moves, the first moving member 4 and the second moving member 5 are mutually staggered as two parallelogram swing arms, so that the distance between the first connecting column 41 and the second connecting column 51 is prolonged, and the auxiliary spring 13 is prolonged; the first moving member 4 and the second moving member 5 are two swing arms of a four-bar mechanism, the first connecting column 41 and the second connecting column 51 increase the distance when the first moving member 4 and the second moving member 5 rotate forwards, so that the auxiliary spring 13 is lengthened, the elastic force for enabling the first moving member 4 and the second moving member 5 to return to the initial state is stored in the auxiliary spring 13, and the first moving member 4 and the second moving member 5 can automatically return to the initial state after the user does not apply force.

Further, as shown in fig. 8-12, the upper end of the second moving member 5 is provided with a sliding groove 52 for installing the clamping tongue 7 from top to bottom, the clamping tongue 7 is arranged in the sliding groove 52, as shown in fig. 14, the clamping tongue 7 comprises a head 71, a sliding part 72 and a rod 73, the diameter of the head 71 is larger than that of the sliding part 72, the diameter of the sliding part 72 is larger than that of the rod 73, the upper end face of the head 71 is provided with the second clamping tooth 9, the lower end of the head 71 is connected with the upper end of the sliding part 72, the lower end of the sliding part 72 is connected with the rod 73, the sliding part 72 is jointed and matched with the sliding groove 52 in a sliding way, the bottom surface of the sliding groove 52 is provided with an avoidance hole 53, and when the clamping tongue 7 slides in the sliding groove 52, the avoidance hole 53 is avoided from the rod 73; the lever 73 is sleeved with a return spring 14, the upper end of the return spring 14 is abutted against the end face of the sliding part 72, the lower end of the return spring 14 is abutted against the bottom face of the sliding groove 52, the return spring 14 is configured to give the elastic force of the directional engagement part 6 of the clamping tongue 7, when the adjustment is not performed, the engagement state of the first clamping tooth 8 and the second clamping tooth 9 is ensured, meanwhile, when the first moving part 4 and the second moving part 5 rotate, the first clamping tooth 8 and the second clamping tooth 9 can be separated, the second clamping tooth 9 can be switched among different first clamping teeth 8, namely, the return spring 14 endows the clamping tongue 7 with the capability of floating up and down and the second clamping tooth 9 to be engaged with the first clamping tooth 8 by itself.

Specifically, the number of the second latches 9 on the latch 7 is four, and the number of the first latches 8 is greater than that of the second latches 9, so that the stability of the engagement of the first latches 8 with the second latches 9 can be improved by increasing the number of the first latches 8, and the support of the chair back 2 on the first moving member 4, the second moving member 5 and the lumbar support member 1 is also improved; a clamping groove 81 is formed between two adjacent first clamping teeth 8, the clamping groove 81 is provided with a sliding surface 811 and a locking surface 812 at the front side and the rear side, and when the second clamping teeth 9 are clamped with the first clamping teeth 8, four first clamping teeth 8 enter the corresponding clamping grooves 81; when the lumbar support 1 moves forward, the first moving member 4 and the second moving member 5 rotate relative to the seat back 2 as the second latch 9 slides toward the sliding surface 811; when a user leans on the lumbar support 1, the second latch 9 has a movement trend of moving towards the locking surface 812, the second latch 9 is locked by the locking surface 812, a specific mode of unidirectional abutting of the first latch 8 and the second latch 9 is realized, and the first movement member 4 and the second movement member 5 can stay for providing support after rotating relative to the chair back 2; the number of the clamping grooves 81 is determined by the first clamping teeth 8, and the number of the clamping grooves 81 is seven, which means that besides the initial state, the gear positions of the first moving member 4, the second moving member 5 and the waist support member 1 are also three gears, and the first moving member 4, the second moving member 5 and the waist support member 1 can only be adjusted from back to front due to unidirectional abutting of the clamping teeth, and after the third gear is reached, the first moving member 4, the second moving member 5 and the waist support member 1 need to be reset, so that the cyclic reciprocating motion can be realized.

As shown in fig. 8-11, the reset slider 10 disposed in the accommodating groove 61 of the engaging portion 6 is reset, specifically, as shown in fig. 15, the reset slider 10 is rotationally disposed in the accommodating groove 61 and is blocked by the first limiting surface 62 in front and is blocked by the second limiting surface 63 in back, after the second moving member 5 rotates to the third gear, the lumbar support member 1 is continuously pulled forward, the second latch 9 positioned at the forefront climbs onto the clutch teeth 11 from the latch groove 81 thereof and passes over the clutch teeth 11 under the action of the reset spring 14 and is clamped with the same, the tooth height of the clutch teeth 11 is larger than the tooth height of the first latch 8, the reset slider 10 further comprises a protruding portion 15 positioned beside the clutch teeth 11, the protruding portion 15 protrudes from the engaging portion 6, after the second latch 9 is clamped with the clutch teeth 11, the second latch 9 is propped against the protruding part 15, so that after the second latch 9 is clamped with the clutch teeth 11, the second latch 9 is completely separated from the first latch 8, at the moment, the waist support piece 1 is loosened, the first moving piece 4 and the second moving piece 5 rotate backwards under the action of the auxiliary spring 13, the second latch 9 drives the reset slide block 10 to rotate backwards, when the reset slide block 10 is propped against the second limiting surface 63, the position of the clutch teeth 11 at the moment can only be remained in front of the fourth clamping groove 81, the clamping tongue 7 continuously moves under the action of the auxiliary spring 13 and inertia, so that the forefront second latch 9 passes over the clutch teeth 11 again, and the four latches correspondingly drop into the four clamping grooves 81 behind the reset slide block 10, so that reset is realized; when the lumbar support 1 moves forward again, the second latch 9 at the forefront can push the reset slider 10 to rotate forward due to the small friction coefficient of the rotating connection of the reset slider 10 and the meshing part 6, until the second moving member 5 is in the third gear, the reset slider 10 is abutted against the first limiting surface 62 again, and the second moving member 5 and the lumbar support 1 can be reset again through the reset slider 10.

Claims (8)

1. A seat for adjusting lumbar support in a depth direction, characterized in that: the chair comprises a waist support piece, a chair back and an adjusting assembly, wherein the waist support piece is arranged on the chair back through the adjusting assembly and is positioned in front of the chair back; the adjusting component comprises a first moving piece and a second moving piece which are parallel to each other, the first moving piece and the second moving piece are arranged at intervals in the front-back direction, one end of the first moving piece and one end of the second moving piece are rotationally connected with the chair back, and the other end of the first moving piece and the other end of the second moving piece are rotationally connected with the waist supporting piece; the adjusting component is provided with an initial state, the first moving piece and the second moving piece are vertical in the initial state, the waist supporting piece is positioned at the rearmost position, and the seat is provided with the maximum seat depth; the adjusting assembly is configured such that when the lumbar support moves in the seat depth direction, the first moving member and the second moving member rotate with each other and support the lumbar support to stay.

2. The seat for adjusting lumbar support in a depth-wise direction according to claim 1, wherein: an auxiliary spring is arranged between the first moving part and the second moving part, two ends of the auxiliary spring are respectively arranged on the first moving part and the second moving part, and the auxiliary spring is configured to provide force for the adjusting assembly to restore the initial state.

3. The seat for adjusting lumbar support in a depth direction according to claim 2, wherein: the lower part of the first moving part is provided with a first connecting column protruding towards the second moving part, the upper part of the second moving part is provided with a second connecting column protruding towards the first moving part, two ends of the auxiliary spring are respectively sleeved on the first connecting column and the second connecting column, and when the waist supporting part moves forwards, the distance between the first connecting column and the second connecting column is increased, and the auxiliary spring stretches.

4. The seat for adjusting lumbar support in a depth-wise direction according to claim 1, wherein: the adjusting assembly further comprises a mounting seat and a supporting assembly; the first moving part and the second moving part are arranged on the chair back through the mounting seat, the mounting seat is fixedly connected to the chair back, the first moving part and the second moving part are rotationally connected to the mounting seat, the supporting component is arranged between the mounting seat and the second moving part and comprises a meshing part and a clamping tongue, the meshing part is arranged on one of the mounting seat or the second moving part, and the clamping tongue is arranged on the other of the mounting seat or the second moving part; the engagement part is provided with first clamping teeth, the clamping tongue is provided with second clamping teeth, the first clamping teeth are selectively engaged with the second clamping teeth, the number of the first clamping teeth is more than that of the second clamping teeth, and when the waist support piece moves, the second clamping teeth are engaged with different first clamping teeth; the support assembly is configured to support the lumbar support in a post-motion position.

5. The seat for adjusting lumbar support in a deep seat direction according to claim 4, wherein: the latch is also provided with a return spring which is configured to give the latch an elastic force against the engagement portion.

6. The seat for adjusting lumbar support in a depth-wise direction according to claim 1, wherein: the chair back comprises a back frame and a support frame, wherein the back frame and the support frame are arranged up and down, and the back frame is connected above the support frame; the back frame comprises a connecting rod positioned at the lower end part, the connecting rod is horizontally arranged in the left-right direction, the upper ends of the first moving part and the second moving part are connected to the connecting rod, the lower ends of the first moving part and the second moving part are connected to the waist supporting part, and the lower ends of the first moving part and the second moving part are connected to the lower part of the waist supporting part.

7. The seat for adjusting lumbar support in a deep seat direction according to claim 6, wherein: the back frame and the support frame are integrally formed, and the back frame and the support frame are of a square frame structure.

8. The seat for adjusting lumbar support in a depth-wise direction according to claim 1, wherein: the distance between the two rotating connecting points of the first moving piece is equal to the distance between the two rotating connecting points of the second moving piece.