CN219895148U

CN219895148U - Chair backrest adjusting mechanism and chair

Info

Publication number: CN219895148U
Application number: CN202320478220.XU
Authority: CN
Inventors: 戴龙飞; 潘文原
Original assignee: Anji Shuyi Smart Home Co ltd
Current assignee: Anji Shuyi Smart Home Co ltd
Priority date: 2023-03-06
Filing date: 2023-03-06
Publication date: 2023-10-27
Anticipated expiration: 2033-03-06

Abstract

The utility model discloses an adjusting mechanism of a seat backrest and a seat, which comprise a connecting seat, a sliding seat, a first connecting rod and a second connecting rod, wherein the connecting seat is connected with a backrest supporting rod, an arc-shaped chute is arranged on the connecting seat, a sliding rod is arranged on the connecting seat, a first groove is arranged on the front end surface of the sliding rod, and the first groove is arranged along the length direction of the sliding rod; the sliding seat is arranged on the sliding rod in a sliding sleeve manner, a rebound piece is connected to the sliding seat and is positioned in the first groove, and the rebound piece is used for pulling the sliding seat to slide towards the connecting seat; a pin shaft matched with the arc chute is arranged on the first connecting rod, one end of the connecting rod is hinged with the sliding seat, and the other end of the connecting rod is hinged with the seat back mounting seat; one end of the second connecting rod is hinged with the sliding seat, the other end of the second connecting rod is hinged with the seat back mounting seat, and the first connecting rod, the second connecting rod, the sliding seat and the seat back mounting seat form a parallel four-connecting-rod structure. The utility model can drive the seat back to extend forwards, and ensure that the back fully supports the back of a user.

Description

Chair backrest adjusting mechanism and chair

Technical Field

The utility model relates to the field of furniture, in particular to an adjusting mechanism of a seat backrest and a seat.

Background

The chair is an indispensable article of modern life, and is widely applied to various companies, families and other public places, the comfort level of the chair directly relates to the working life quality of people, in the prior art, the backrest of the chair is mostly fixedly connected, the sitting depth of the chair is also of a fixed length, when people with different body types use the chair, the backrest can not be attached to the back of the user well, the comfort level is low, and the sitting for a long time is easy to be tired. Some seats adopt a similar automobile seat adjusting structure, but the seat can only rotate for the whole backrest, the fitting degree is poor, the angle is fixed after adjustment, and the seat cannot follow the back of a user. Chinese patent application number CN202110541110.9, publication No. 2021-08-10, title of the utility model a heating physiotherapy chair convenient to adjust back angle, this application discloses an adjust back angle mechanism, and the back in this application can only adjust its supporting angle, and the back can't realize following user's back, and user experience is poor.

Disclosure of Invention

In order to solve the technical problems, the utility model aims to provide an adjusting mechanism of a seat back and the seat, wherein the adjusting mechanism arranged between a back supporting rod and the seat back comprises a first connecting rod, a second connecting rod, a sliding seat and a seat back mounting seat to form a four-connecting-rod structure, so that the seat back mounting seat can translate forwards and backwards, and the rebound piece is arranged to drive the seat back mounting seat to extend forwards, so that the seat back can follow the back of a user at any time, and the aim of improving the comfort level of the back of the user is fulfilled.

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

an adjustment mechanism for a seat back disposed on a back support bar, comprising:

the connecting seat is connected with the backrest support rod, an arc chute is arranged on the connecting seat, and a sliding guide rod is arranged on the connecting seat;

the sliding seat is sleeved on the sliding guide rod in a sliding manner, and a rebound piece is arranged on the sliding guide rod and is used for pulling the sliding seat to slide towards the connecting seat;

the first connecting rod is provided with a pin shaft matched with the arc chute, one end of the first connecting rod is hinged with the sliding seat, and the other end of the first connecting rod is hinged with a seat back mounting seat;

the first connecting rod, the second connecting rod and the sliding seat are arranged on the connecting seat in a sliding manner, and the seat back mounting seat and the other end of the second connecting rod form a four-connecting-rod structure.

In the scheme, the seat back is arranged on the seat back mounting seat, when the back of a user leaves the seat back, the rebound piece pulls the sliding seat on the sliding guide rod to slide towards the connecting seat, the pin shaft of the first connecting rod slides along the arc-shaped chute from one end of the arc-shaped chute close to the back support rod to one end of the arc-shaped chute far away from the back support rod, at the moment, the lower ends of the first connecting rod and the second connecting rod which are arranged in parallel slide along the sliding seat towards the connecting seat and the included angle between the lower ends of the first connecting rod and the second connecting rod and the back support rod is reduced from large, and the seat back mounting seat hinged with the first connecting rod and the second connecting rod moves forwards until the pin shaft slides to the outermost end of the arc-shaped chute, namely, the seat back mounting seat is positioned at the forefront position; when the back of the user leans against the seat back, the elastic force of the rebound piece resists the stress of the seat back, so that the seat back is attached to the back of the user at all times.

Preferably, the connecting seat comprises a base, a connecting sleeve connected with the base and a sliding guide rod connected with the base, wherein the connecting sleeve is sleeved on the backrest support rod, the sliding guide rod is downwards arranged, the arc-shaped chute is arranged on the base and is bent upwards from back to front, and the arc-shaped chute is used for limiting the moving range and track of the sliding seat. The arc chute limits the forward extending and backward moving range of the seat back mounting seat, namely, the sliding seat is ensured not to collide with the connecting seat and to deviate from the sliding guide rod. The guide is realized by arranging the arc chute without additional guide parts, so that the purpose of reducing the volume of the adjusting mechanism is achieved.

Preferably, the connecting seat comprises a base, a connecting sleeve connected with the base and a sliding guide rod connected with the base, the connecting sleeve is sleeved on the backrest support rod, the sliding guide rod is upwards arranged, the arc-shaped chute is arranged on the base and is bent downwards from back to front, and the arc-shaped chute is used for limiting the moving range and track of the sliding seat.

Preferably, the rebound member comprises a tension spring, one end of the tension spring is connected with the sliding seat, the other end of the tension spring is connected with the inner wall of the sliding guide rod, and the tension spring is in tensioning arrangement. The tension springs are arranged in a tensioning mode, power is provided for the sliding seat to slide along the sliding guide rod, and the trend of the sliding seat towards the connecting seat is guaranteed. The connecting seat is connected with the backrest support rod through the connecting sleeve, and the backrest support rod is a rod piece, so that the installation volume of the backrest support rod is limited, the space for arranging the rebound piece is not provided, the connecting seat is only connected, the rebound piece is arranged in the first groove, the rebound piece cannot be exposed, the hidden installation of the rebound piece is realized, and the installation space is saved.

Preferably, the sliding seat is further provided with a locking structure, the locking structure is used for fixing the sliding seat on the sliding guide rod, the locking structure comprises a locking seat, a locking rod and a rotary unlocking assembly, the sliding seat is provided with a second groove, a guide block is arranged in the second groove, a guide channel matched with the sliding guide rod is vertically arranged on the guide block, the locking seat is arranged on the front side of the guide block, the locking seat is provided with a locking channel matched with the guide channel, the locking channel is communicated with the guide channel, the locking rod is slidably arranged in the guide channel, a plurality of locking holes are formed in the bottom surface of the first groove at intervals in the vertical direction, the locking holes are matched with the locking rod, the guide channel is provided with perforations for the locking rod to penetrate out of the sliding seat, the locking rod is provided with an unlocking state and a locking state, and is in the unlocking state when the locking rod stretches into the locking holes through the perforations, and is in the locking state, the locking rod is in the unlocking state when the locking rod is in the unlocking state, and is in the unlocking state when the locking rod is in the rotary unlocking state, and is in the unlocking state. Through setting up locking structure and a plurality of locking hole, realize with the seat back mount pad fixed at different angles, be convenient for keep user's comfortable position of sitting or correct position of sitting.

Preferably, an annular flange is arranged in the guide channel, an annular baffle is arranged at the front end of the locking rod, a spring is arranged between the annular flange and the annular baffle, and the spring is sleeved on the locking rod and is arranged between the annular flange and the annular baffle in a compressed mode. The spring is compressed between the annular flange and the annular baffle plate, when the locking rod is in a locking state, the spring compresses the locking rod in the locking hole, locking stability is improved, when the locking rod is in an unlocking state, the spring enables the locking rod to have a trend of extending to the locking hole, and a user can conveniently switch the locking rod from the unlocking state to the locking state.

Preferably, the rotary unlocking component comprises two bosses and unlocking torsion bars, wherein the bosses are arranged on the inner wall of the guide channel, the two bosses are arranged along the central symmetry of the axis of the guide channel, the table top of the boss extends spirally from front to back, the two joints of the boss are respectively provided with a limiting block, one end of the unlocking torsion bar is connected with the locking rod, the other end of the unlocking torsion bar is positioned outside the guide channel, two sliding blocks are arranged on the side wall of the unlocking torsion bar, the two sliding blocks are arranged along the central symmetry of the axis of the unlocking torsion bar, the bottom surface of the sliding blocks is provided with an inclined surface matched with the top surface of the boss, when the locking rod is in a locking state, the sliding blocks are positioned at the foremost end of the boss and the side wall of the boss are abutted against the limiting blocks, and when the locking rod is in an unlocking state, the sliding blocks are positioned at the rearmost end of the boss and the side wall of the boss are abutted against the limiting blocks. When in actual use, a user only needs to rotate the unlocking torsion bar to unlock and lock the locking rod, specifically, a sliding block on the unlocking torsion bar slides along the table top of the boss, when the sliding block slides to the forefront end of the table top of the boss, the unlocking torsion bar pulls the locking rod out of the locking hole, and when the sliding block slides to the rearmost end of the table top of the boss, the unlocking torsion bar presses the locking rod into the locking hole.

Preferably, the part of the table top at the forefront end of the boss is horizontally arranged, so that the sliding block for unlocking the torsion bar is clamped at the forefront end of the table top of the boss, and the unlocking torsion bar is prevented from being automatically switched from the unlocking state to the locking state.

Preferably, the left and right side walls of the second groove are provided with a first hinge hole and a second hinge hole, the seat back mounting seat is provided with a third hinge hole and a fourth hinge hole, two ends of the first connecting rod are hinged with the first hinge hole and the third hinge hole respectively, and two ends of the second connecting rod are hinged with the second hinge hole and the fourth hinge hole respectively.

Preferably, the sliding seat is provided with a clamping groove matched with the backrest support rod. Through setting up the draw-in groove, realize increasing the area of contact of sliding seat and back bracing piece, promote the sliding stability of sliding seat.

Still further provided is a seat comprising a back support bar and a seat back, the back support bar and the seat back being connected by an adjustment mechanism.

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

through setting up first connecting rod, second connecting rod, sliding the setting and slide seat and seat back mount pad constitution four-bar linkage structure on the connecting seat, guarantee seat back mount pad can be along horizontal direction removal, through setting up the resilience piece for four-bar linkage structure drives seat back mount pad and stretches forward, realizes fully supporting user's back.

Drawings

FIG. 1 is a schematic view of an adjustment mechanism;

FIG. 2 is a schematic view of a connection base;

FIG. 3 is a schematic view of another angle of the connector base;

FIG. 4 is a schematic view of a skid;

FIG. 5 is a schematic view of another angle of the glide base;

FIG. 6 is a schematic view of another angle of the glide base;

FIG. 7 is a schematic illustration of a glide base and unlocking torsion bar;

FIG. 8 is a cross-sectional view of the connecting seat, back support bar, glide seat and locking structure;

FIG. 9 is a cross-sectional view of the slide mount and locking structure;

FIG. 10 is an exploded schematic view of the adjustment mechanism;

FIG. 11 is a schematic view of a seat with an adjustment mechanism mounted thereto;

fig. 12 is a schematic view of the connection base in embodiment 2.

The reference numerals in the drawings are as follows:

1. a back support bar; 2. a connecting seat; 3. an arc chute; 4. sliding the guide rod; 5. a first groove; 6. a sliding seat; 7. a first link; 8. a second link; 10. a tension spring; 11. a second groove; 12. a guide block; 13. a guide channel; 14. a locking seat; 15. a locking lever; 16. a locking channel; 17. a locking hole; 18. perforating; 19. an annular flange; 20. a spring; 22. an annular baffle; 23. a boss; 24. unlocking the torsion bar; 25. a limiting block; 26. a slide block; 27. a clamping groove; 28. a seat back mount; 29. a seat back; 30. a connecting sleeve; 31. a base; 32. a fixing hole; 33. and a connection hole.

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, without conflict, the embodiments of the present utility model 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 utility model, however, the present utility model may be practiced in other ways than those described herein, and therefore the scope of the present utility model is not limited to the specific embodiments disclosed below.

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

example 1: as shown in fig. 1 to 11, the present utility model provides an adjusting mechanism of a seat back, provided on a back support bar 1, comprising:

the connecting seat 2 is connected with the backrest support rod 1, the connecting seat 2 is provided with a sliding guide rod 4, the connecting seat 2 comprises a base 31, a connecting sleeve 30 connected with the base 31 and the sliding guide rod 4 connected with the base 31, the connecting sleeve 30 is sleeved on the backrest support rod 1, the sliding guide rod 4 is downwards arranged, the arc-shaped chute 3 is arranged on the base 31, the arc-shaped chute 3 is upwards bent from back to front, the arc-shaped chute 3 is used for limiting the moving range and track of the sliding seat 6, the front end surface of the sliding guide rod 4 is provided with a first groove 5, and the first groove 5 is arranged along the length direction of the sliding guide rod 4;

the sliding seat 6 is arranged on the sliding guide rod 4 in a sliding sleeved mode, a tension spring 10 is arranged in the first groove 5, one end of the tension spring 10 is connected with the sliding seat 6, the other end of the tension spring 10 is connected with the inner wall of the sliding guide rod 4, the tension spring 10 is arranged in a tensioning mode, and the tension spring 10 is used for pulling the sliding seat 6 to slide towards the connecting seat 2;

the first connecting rod 7, the first connecting rod 7 is provided with a pin shaft matched with the arc chute 3, one end of the first connecting rod is hinged with the sliding seat 6, and the other end of the first connecting rod is hinged with the seat back mounting seat 28;

the second connecting rod 8, the one end of second connecting rod 8 is articulated with sliding seat 6, and the other end of second connecting rod 8 is articulated with seat back mount pad 28, and first connecting rod 7 and second connecting rod 8 parallel arrangement, first connecting rod 7, second connecting rod 8, sliding set up on connecting seat 2 sliding seat 6 and seat back mount pad 28 constitute four-bar linkage structure.

In the scheme, the seat back 29 is arranged on the seat back mounting seat 28, when the back of a user leaves the seat back 29, the rebound piece pulls the sliding seat 6 on the sliding guide rod 4 to slide towards the connecting seat 2, the pin shaft of the first connecting rod 7 slides along the arc-shaped chute 3 from one end of the arc-shaped chute 3 close to the back support rod 1 to one end of the arc-shaped chute 3 far away from the back support rod, at the moment, the first connecting rod 7 and the second connecting rod 8 which are arranged in parallel move upwards to drive the seat back mounting seat 28 to translate forwards until the pin shaft slides to the outermost end of the arc-shaped chute 3, namely, the seat back mounting seat 28 is positioned at the forefront position; when the back of the user rests on the seatback 29, the elastic force of the resilient member resists the force of the seatback 29, so that the seatback 29 is held against the back of the user at all times. It can be appreciated that the arc chute 3 limits the forward extending and backward moving range of the seat back mounting seat 28, that is, the sliding seat 6 is guaranteed not to collide with the connecting seat 2 and separate from the sliding guide rod 4, in addition, the arc chute 3 is provided for guiding, no additional guiding component is needed, and the purpose of reducing the volume of the adjusting mechanism is achieved. Specifically, the length of the sliding groove is smaller than the length of the sliding guide bar 4. By arranging the rebound member in the first groove 5, the installation space is saved and the hidden installation of the rebound member is realized, so that the rebound member is not exposed. It can be appreciated that the connecting seat 2 is connected with the backrest support rod 1 through the connecting sleeve 30, and since the backrest support rod 1 is a rod piece, the installation volume is limited, the space for arranging the rebound piece is not provided, only the connecting seat 1 is connected, the rebound piece is arranged in the first groove 5, the rebound piece is not exposed, the hidden installation of the rebound piece is realized, and the installation space is saved. Tension spring 10 is arranged in a tensioning mode, power is provided for sliding of sliding seat 6 along sliding guide rod 4, the trend of sliding seat 6 towards connecting seat 2 is guaranteed, and in addition, the sliding trend of first connecting rod 7 is limited by arc-shaped chute 3. In this embodiment, a hook is disposed in the side wall of the first groove 5, a hook is disposed on the sliding seat 6, one end of the tension spring 10 is connected with the hook, the other end of the tension spring 10 is connected with the hanging shaft, and the hook is located at a position close to the connecting seat 2, so as to ensure that the tension spring 10 is fully tensioned. It should be noted that, the setting of the hook on the side wall of the first groove 5 is only a preferred scheme of this embodiment, and the hook position may also be set on the connection seat 2, and it is to be understood that the hook only has the function of fixing one end of the tension spring 10, so that the tension spring 10 is tensioned, the position of the hook is not limited, and a suitable position is selected according to the requirement in actual production.

Further, the left and right side walls of the second groove 11 are provided with a first hinge hole and a second hinge hole, the seat back mounting seat 28 is provided with a third hinge hole and a fourth hinge hole, two ends of the first connecting rod 7 are hinged with the first hinge hole and the third hinge hole respectively, two ends of the second connecting rod 8 are hinged with the second hinge hole and the fourth hinge hole respectively, the first connecting rod 7, the second connecting rod 8, the sliding seat 6 arranged on the connecting seat 2 and the seat back mounting seat 28 form a parallel double-rocker structure, the first connecting rod 7 is equivalent to a frame, the sliding seat 6 and the seat back mounting seat 28 are equivalent to a side link, the second connecting rod 8 is equivalent to a connecting rod, the first connecting rod 7 and the second connecting rod 8 are always kept parallel, and the seat back mounting seat 28 is ensured to translate along the front-back direction. In this embodiment, the cross-section of first connecting rod 7 and second connecting rod 8 is "U" shape, first connecting rod 7 and the relative lock setting of second connecting rod 8 form the cavity between first connecting rod 7 and the second connecting rod 8, wherein, the diapire of first connecting rod 7 is equipped with the breach, when sliding seat drives first connecting rod 7 and second connecting rod 8 and slides along the slip guide bar, connecting seat 2 passes through the breach business turn over cavity, in addition, connecting seat 2 is equipped with a plurality of slots towards the one end of breach, the diapire of first connecting rod 7 is vertical to be equipped with a plurality of picture peg that correspond with the slot, picture peg and slot one-to-one, when sliding seat drives first connecting rod 7 and second connecting rod 8 and slides along the slip guide bar, the picture peg slides in the slot that corresponds.

In this embodiment, the connecting sleeve 30 is fixed to the backrest support bar 1 by a bolt assembly, a plurality of fixing holes 32 are provided in the backrest support bar 1 along the length direction, a connecting hole 33 corresponding to the fixing hole 32 is provided in the side wall of the connecting sleeve 30, when the height of the backrest of the seat needs to be adjusted, the bolt assembly is loosened, the connecting sleeve 30 is slid to the fixing hole near the corresponding height, and the connecting sleeve 30 is locked at the fixing hole 32 by the bolt assembly again, and it is noted that only the position adjustment of the connecting sleeve 30 on the backrest support bar 1 is described, the fixing mode of the connecting sleeve 30 is not limited, and the connecting sleeve 30 can be locked at different positions of the backrest support bar by a hoop or the like.

As shown in fig. 7 to 10, the sliding seat 6 is further provided with a locking structure, the locking structure is used for fixing the sliding seat 6 on the sliding guide rod 4, the locking structure comprises a locking seat 14, a locking rod 15 and a rotary unlocking component, the sliding seat 6 is provided with a second groove 11, a guide block 12 is arranged in the second groove 11, a guide channel 13 matched with the sliding guide rod 4 is vertically arranged on the guide block 12, the locking seat 14 is arranged at the front side of the guide block 12, the locking seat 14 is provided with a locking channel 16 matched with the guide channel 13, the locking channel 16 is communicated with the guide channel 13, the locking rod 15 is slidably arranged in the guide channel 13, a plurality of locking holes 17 are arranged on the bottom surface of the first groove 5 along the vertical direction at intervals, the locking hole 17 is matched with the locking rod 15, a through hole 18 for the locking rod 15 to penetrate through the sliding seat 6 is formed in the guide channel 13, the locking rod 15 is in an unlocking state and a locking state, when the locking rod 15 stretches into the locking hole 17 through the through hole 18, the locking rod 15 is in the locking state, when the locking rod 15 is out of the locking hole 17, the locking rod 15 is in the unlocking state, the rotary unlocking assembly is used for driving the locking rod 15 to switch between the unlocking state and the locking state, an annular flange 19 is arranged in the guide channel 13, an annular baffle 22 is arranged at the front end of the locking rod 15, a spring 20 is arranged between the annular flange 19 and the annular baffle 22, and the spring 20 is sleeved on the locking rod 15 and is arranged between the annular flange 19 and the annular baffle 22 in a compressed mode. By providing a locking structure and a plurality of locking holes 17, the seat back mounting seat 28 is fixed at different angles, so that the comfortable sitting position or the correct sitting position of a user can be conveniently maintained; the spring 20 is compressed between the annular flange 19 and the annular baffle 22, when the locking rod 15 is in the locking state, the spring 20 compresses the locking rod 15 in the locking hole 17, locking stability is improved, and when the locking rod is in the unlocking state, the spring 20 enables the locking rod 15 to have a trend of extending to the locking hole 17, so that a user can conveniently switch the locking rod 15 from the unlocking state to the locking state.

As shown in fig. 4 to 10, the rotary unlocking assembly comprises two bosses 23 and unlocking torsion bars 24 which are arranged on the inner wall of the guide channel 13, the two bosses 23 are arranged along the center of the axis of the guide channel 13, the table top of the boss 23 spirally extends from front to back, two connection positions of the boss 23 are respectively provided with a limiting block 25, one end of the unlocking torsion bar 24 is connected with the locking rod 15, the other end of the unlocking torsion bar 24 is positioned outside the guide channel 13, two sliding blocks 26 are arranged on the side wall of the unlocking torsion bar 24, the two sliding blocks 26 are arranged along the center of the axis of the unlocking torsion bar 24, the bottom surface of the sliding blocks 26 is provided with inclined surfaces matched with the top surface of the boss 23, when the locking rod 15 is in a locking state, the sliding blocks 26 are positioned at the foremost end of the boss 23, the side walls of the sliding blocks 26 are abutted against the limiting blocks 25, and when the locking rod 15 is in an unlocking state, the sliding blocks 26 are positioned at the rearmost end of the boss 23, and the side walls of the sliding blocks are abutted against the limiting blocks 25. In this embodiment, the forefront part of the table top of the boss 23 is horizontally arranged, so that the slider 26 of the unlocking torsion bar 24 is conveniently clamped at the forefront part of the table top of the boss 23, and the unlocking torsion bar 24 is prevented from being automatically switched from the unlocking state to the locking state. In actual use, a user rotates one end of the unlocking torsion bar 24 outside the guide channel 13 to enable the unlocking bar to advance to the forefront end along the table top of the boss 23, at this time, the unlocking torsion bar 24 pulls the locking bar 15 to be separated from the locking hole 17, the sliding block 26 of the unlocking torsion bar 24 is clamped at the horizontal part of the boss 23, and the side wall of the sliding block 26 abuts against the limiting block 25, so that the locking bar 15 is kept at the unlocking position; when the user rotates the unlocking torsion bar 24 reversely, the sliding block 26 of the unlocking torsion bar 24 slides to the rearmost end along the table surface of the boss 23, the side wall of the sliding block 26 is propped against the limiting block 25, at the moment, the locking rod 15 enters the locking hole 17, and the tension spring 10 can not pull the sliding seat 6, so that the seat back mounting seat 28 is fixed. By setting the limiting block 25, the rotation range of the unlocking torsion bar 24 is limited, and a user can unlock and lock the locking rod 15 only by rotating the unlocking torsion bar 24, so that the operation is simple and quick. In the present embodiment, the end of the unlocking torsion bar 24 located outside the guide passage 13 is provided with a wrench, and by providing the wrench, a user can conveniently pull the unlocking torsion bar 24 to rotate.

As shown in fig. 5, the sliding seat 6 is provided with a clamping groove 27 matched with the backrest support rod 1. By arranging the clamping groove 27, the contact area between the sliding seat 6 and the backrest support rod 1 is increased, and the sliding stability of the sliding seat 6 is improved. In this embodiment, the clamping groove 27 is an open arc groove, the radian of the groove wall of the clamping groove 27 is consistent with the radian of the outer wall of the backrest support rod 1, and when in actual work, part of the backrest support rod 1 is positioned in the clamping groove 27 of the sliding seat 6, so as to achieve the purpose of improving the sliding stability of the sliding seat 6.

As shown in fig. 11, there is provided a seat including a back support bar 1 and a seat back 29, the back support bar 1 and the seat back 29 being connected by an adjusting mechanism.

Example 2: as shown in fig. 12, this embodiment differs from embodiment 1 in that the slide guide lever 4 on the base 31 is provided upward, the arc chute 3 is provided curved downward from the rear forward, and the arc chute 3 serves to limit the movement range and trajectory of the slide mount 6. It will be understood that the difference between the present embodiment and embodiment 1 is only that the installation direction is different, and since the adjusting mechanism has a four-bar structure, only the trend of the arc chute 3 is changed, and the installation direction is not limited by the up-down direction.

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

Claims

1. An adjustment mechanism for a seat back disposed on a back support bar, comprising:

the first connecting rod, the second connecting rod, the sliding seat and the seat back mounting seat form a four-connecting-rod structure, and the sliding seat is arranged on the connecting seat in a sliding manner.

2. The adjusting mechanism of a seat back according to claim 1, wherein the connecting seat comprises a base, a connecting sleeve connected with the base and a sliding guide rod connected with the base, the connecting sleeve is sleeved on the back support rod, the sliding guide rod is arranged downwards, the arc-shaped chute is arranged on the base, the arc-shaped chute is bent upwards from back to front, and the arc-shaped chute is used for limiting the movement range and track of the sliding seat.

3. The adjusting mechanism of a seat back according to claim 1, wherein the connecting seat comprises a base, a connecting sleeve connected with the base and a sliding guide rod connected with the base, the connecting sleeve is sleeved on the back support rod, the sliding guide rod is arranged upwards, the arc-shaped chute is arranged on the base, the arc-shaped chute is bent downwards from back to front, and the arc-shaped chute is used for limiting the moving range and track of the sliding seat.

4. The adjusting mechanism of a seat back according to claim 1, 2 or 3, wherein a first groove is formed in the front end face of the sliding guide rod, the first groove is formed in the length direction of the sliding guide rod, the rebound member is located in the first groove, the rebound member comprises a tension spring, one end of the tension spring is connected with the sliding seat, the other end of the tension spring is connected with the inner wall of the sliding guide rod, and the tension spring is in tensioning arrangement.

5. The adjusting mechanism of a backrest according to claim 4, wherein the sliding seat is further provided with a locking structure, the locking structure is used for fixing the sliding seat on the sliding guide rod, the locking structure comprises a locking seat, a locking rod and a rotary unlocking component, the sliding seat is provided with a second groove, a guide block is arranged in the second groove, the guide block is vertically provided with a guide channel matched with the sliding guide rod, the locking seat is arranged on the front side of the guide block, the locking seat is provided with a locking channel matched with the guide channel, the locking channel is communicated with the guide channel, the locking rod is slidably arranged in the guide channel, a plurality of locking holes are formed in the bottom surface of the first groove at intervals in the vertical direction, the locking holes are matched with the locking rod, the guide channel is provided with a through hole for the locking rod to penetrate out of the seat, the locking rod is provided with an unlocking state and a locking state, the locking rod is provided with a locking state, and when the locking rod is stretched into the locking hole, the locking rod is in the unlocking state, and the locking rod is in the unlocking state when the locking rod is in the unlocking state, and the locking rod is in the unlocking state.

6. The seat back adjustment mechanism according to claim 5, wherein an annular flange is provided in the guide passage, an annular stopper is provided at a front end of the lock lever, a spring is provided between the annular flange and the annular stopper, and the spring is fitted over the lock lever and is compressively disposed between the annular flange and the annular stopper.

7. The adjusting mechanism of a seat backrest according to claim 5, wherein the rotary unlocking component comprises two bosses and an unlocking torsion bar, the two bosses are arranged on the inner wall of the guide channel in a central symmetry manner, the table top of the boss extends spirally from front to back, limiting blocks are arranged at two connecting positions of the bosses, one end of the unlocking torsion bar is connected with the locking bar, the other end of the unlocking torsion bar is positioned outside the guide channel, two sliding blocks are arranged on the side wall of the unlocking torsion bar, the two sliding blocks are arranged in a central symmetry manner along the axis of the unlocking torsion bar, the bottom surface of the sliding blocks is provided with inclined surfaces matched with the top surface of the boss, when the locking bar is in a locked state, the sliding blocks are positioned at the foremost end of the boss, and when the locking bar is in an unlocked state, the sliding blocks are positioned at the rearmost end of the boss.

8. The adjusting mechanism of the seat back according to claim 5, wherein a first hinge hole and a second hinge hole are formed in the left side wall and the right side wall of the second groove, a third hinge hole and a fourth hinge hole are formed in the seat back mounting seat, two ends of the first connecting rod are hinged to the first hinge hole and the third hinge hole respectively, and two ends of the second connecting rod are hinged to the second hinge hole and the fourth hinge hole respectively.

9. The adjusting mechanism of a seat back according to claim 1, 2 or 3, wherein the sliding seat is provided with a clamping groove matched with the back support rod.

10. A seat comprising an adjustment mechanism for a seat back according to any one of claims 1 to 9.