CN218889465U

CN218889465U - Chair seat

Info

Publication number: CN218889465U
Application number: CN202223408358.7U
Authority: CN
Inventors: 唐金华
Original assignee: Anji Shanye Home Co ltd
Current assignee: Anji Shanye Home Co ltd
Priority date: 2022-12-16
Filing date: 2022-12-16
Publication date: 2023-04-21
Anticipated expiration: 2032-12-16

Abstract

The utility model relates to a seat, belongs to the field of seats, and aims at solving the problems that the existing back-following seat is complex in structure and high in processing cost. The technical scheme is as follows: a seat comprises a four-bar mechanism consisting of a bracket, a front connecting bar, a rear connecting bar and a base, and a position locking mechanism for controlling the four-bar mechanism to stay in a set state, wherein the bracket is configured to be provided with a cushion, the rear connecting bar extends upwards to form a seat back support, the seat back support is connected with a seat back, and the base is connected with a seat support piece; when the bracket moves forwards and downwards under the action of downward pressure, the front connecting rod, the rear connecting rod and the chair back support all incline forwards synchronously, and the chair back is positioned at the position of the bracket in front so as to be kept in place in the back-following state.

Description

Chair seat

Technical Field

The utility model belongs to the field of seats, and particularly relates to a seat.

Background

Most of the backrests of the existing seats are fixed and cannot move forwards and backwards, so that the seat depth cannot be adjusted, and after a person sits down, most of the backrests cannot fit with the waist and the back of the human body in a sitting posture. The backrest is separated from the waist of the human body, so that the backrest can not provide effective support for the waist of the human body, the spine of the human body can not be effectively supported, and a plurality of health problems are easily caused by long-time sitting.

Chinese patent No. CN216776528U discloses a seat back adjusting mechanism and a seat, and a locking mechanism is provided to lock and unlock the movement of the link of the seat back adjusting mechanism, thereby adjusting the seat back. While this patent can adjust the seatback by the locking device, the seatback adjustment-related mechanism is provided on the back, exposed to the outside, unsightly, and complicated in structure, for example, in this patent, the locking mechanism includes a lock driving piece and a lock gear; the locking gear can be meshed and locked with the meshing tooth part of the connecting rod; the locking driving piece can push the locking gear to enable the locking gear to be separated from the meshing tooth part of the connecting rod; the mechanism is expensive in processing and manufacturing cost and is not beneficial to popularization and application.

Disclosure of Invention

Aiming at the problems in the prior art, the utility model provides the chair, the position of the chair back can be adjusted according to the needs of a user only by adopting the four-bar mechanism and the position locking mechanism, the position locking mechanism is a rod-shaped piece, the structure is simple, and the four-bar mechanism and the position locking mechanism are arranged on the seat part and are easy to hide, so that the overall appearance of the chair is not influenced.

The technical scheme adopted by the utility model is as follows:

a seat comprises a four-bar mechanism consisting of a bracket, a front connecting bar, a rear connecting bar and a base, and a position locking mechanism for controlling the four-bar mechanism to stay in a set state, wherein the position locking mechanism is a rod-shaped member which can be lengthened and shortened; when the bracket moves forwards and downwards under the action of downward pressure, the front connecting rod, the rear connecting rod and the chair back support all incline forwards synchronously, and the chair back is positioned at the position of the bracket in front so as to be kept in place in the back-following state.

The seat is provided with a free state and a locking state, wherein in the free state, the position locking mechanism is in an open state, and the seat back, the seat back support and the four-bar mechanism form linkage; in the locking state, the position locking mechanism is in a closed state, the chair back bracket and the four connecting rods are fixed, and the positions of the chair back bracket and the four connecting rods are determined.

The four-bar mechanism can relatively rotate at the movable joint, when the position locking mechanism is in an open state, a human body sits on the seat cushion, the bracket moves forwards and downwards under the lower pressure of the dead weight of the human body, and the front connecting bar, the rear connecting bar and the chair back support are driven to topple forwards until the chair back is attached to the back of the human body, so that the back following action is completed. After the comfortable sitting posture of the user is achieved, the position locking mechanism can be adjusted to be in a locking state, the four-bar linkage is locked, linkage does not occur any more, and the position of the chair back is fixed.

Further, the front end and the rear end of the bracket are respectively hinged with the upper ends of the front connecting rod and the rear connecting rod, and the front end and the rear end of the base are respectively hinged with the lower ends of the front connecting rod and the rear connecting rod. The front connecting rod and the rear connecting rod are matched and hinged on the base and the bracket, so that when one of the front connecting rod and the rear connecting rod moves relatively, the other of the front connecting rod and the rear connecting rod also can correspondingly link. When the bracket moves downwards, the front connecting rod and the rear connecting rod can extend forwards, so that the chair back bracket drives the chair seat to finish the back-following action.

In a more preferable scheme, the position locking mechanism is an air rod. The gas selecting and distributing rod is easy, and the position is fixed by opening and closing the gas rod.

Further, one end of the air rod is hinged with the front end of the base, and the other end of the air rod is hinged with the rear end of the bracket. The air bar is connected with a switch, the switch is opened, and the air bar is in a free state and can not prevent the linkage of the four-bar mechanism. When the switch is closed, the length of the air rod is fixed, the diagonal line distance of the four-bar mechanism is fixed, the relative positions of the four bars are locked, and linkage no longer occurs.

More preferably, the upper end of the chair back support is fixedly connected with the chair back, or the upper end of the chair back support is rotationally connected with the chair back. The chair back support is fixedly connected with the chair back, so that the chair back support drives the chair back to tilt forwards to realize the back-following function in the back-following process; if the upper end of the chair back support is rotationally connected with the chair back, a user can automatically adjust the rotation angle of the chair back to meet the requirement of sitting postures.

In a more preferable scheme, the chair back support is an arc-shaped rod which is bent towards the front of the chair, and the chair back is in an arc shape protruding towards the front of the chair. When the chair back support leans forward, the arched chair back is attached to a user, and the arched chair back is gradually attached to the back through the cambered surface of the chair back until enough supporting force is given to the waist and the back, so that the back following action is more natural and softer.

In a more preferable scheme, the front surface of the chair back forms an leaning surface for supporting the back of a human body, the leaning surface is divided into an upper part, a middle part and a lower part from top to bottom, and when the chair back is positioned at a position of the bracket in front, the upper part and the middle part of the leaning surface play a supporting role. When the bracket is pressed downwards, the chair back bracket is driven to incline forwards, the chair back approaches to a user, the middle part of the leaning surface is contacted with the back of the human body, and if the weight of the user is heavier or the user sits more backwards, the middle part of the leaning surface provides support for the waist and the back of the user; if the user is lighter or sits more forward, the chair back support continues to tilt forward, and the upper portion of the abutment surface provides support to the user's lumbar back. Such an arrangement can meet the needs of different users in body shapes and sitting postures.

The utility model has the beneficial effects that:

1. when a user sits on the seat, the position locking mechanism switch is turned on, the bracket moves forwards and downwards under the action of the downward pressure from the dead weight of the human body, and the front connecting rod, the rear connecting rod and the chair back support incline forwards synchronously until the chair back contacts the back of the user, and when the comfortable sitting posture of the user is achieved, the position locking switch is turned off, so that the position of the chair back is fixed. The chair back position can be adjusted by a user according to the requirements of the user only by using the four-bar mechanism and the position locking switch, the structure is simple, the processing is convenient, and the production cost of the chair back is greatly reduced.

2. The chair back is arranged into an arch in the up-down direction, the arch is gradually close to the waist and the back of a user in the back-following process, the arch is gradually attached to the back through the cambered surface until enough supporting force is given to the waist and the back, and the arch chair back is designed to enable the back-following action to be more natural and softer.

Drawings

FIG. 1 is a schematic perspective view of a seat according to the present utility model;

FIG. 2 is a schematic view of the seat of the present utility model in an unloaded state;

FIG. 3 is a schematic view of an exploded view of a seat according to the present utility model;

FIG. 4 is a schematic view of the structure of the chair according to the present utility model when the chair performs a back-following motion;

FIG. 5 is a schematic view of a split construction of the seat of the present utility model;

fig. 6 is a schematic front view of the chair of the present utility model.

The labels in the figures are as follows:

1. a bracket; 2. a front link; 3. a rear connecting rod; 4. a base; 5. a four bar linkage; 6. a cushion; 7. a chair back bracket; 8. a chair back; 9. an air bar; 10. an abutting surface; 11. an upper portion; 12. a middle portion; 13. a lower portion; 14. a main support plate; 15. a connecting lug; A. a first hinge shaft; B. and a second hinge shaft.

Detailed Description

The technical solutions of the embodiments of the present utility model will be explained and illustrated below with reference to the drawings of the present utility model, but the following embodiments are only preferred embodiments of the present utility model, and not all the embodiments. Based on the examples in the implementation manner, other examples obtained by a person skilled in the art without making creative efforts fall within the protection scope of the present utility model.

1-6, the seat comprises a four-bar linkage mechanism 5 formed by a bracket 1, a front connecting rod 2, a rear connecting rod 3 and a base 4, and a position locking mechanism for controlling the four-bar linkage mechanism 5 to stay in a set state, wherein when the position locking mechanism is opened, the four-bar linkage mechanism 5 can freely move, and when the position locking mechanism is closed, the relative position of the four-bar linkage mechanism 5 is fixed and cannot move. The bracket 1 is provided with a main supporting plate 11 which is horizontally arranged, the main supporting plate 14 is provided with four connecting lugs 15, the bracket 1 is fixedly connected with the seat cushion 6 through the connecting lugs 15, the bottom of the seat cushion 6 is provided with a wood plate, and the wood plate and the connecting lugs 15 are locked through screws. The rear connecting rod 3 extends upwards to form a chair back support 7, the chair back support 7 is connected with a chair back 8, and the base 4 is connected with a chair support piece; when the bracket 1 moves forward and downward under the action of downward pressure, the front connecting rod 2, the rear connecting rod 3 and the chair back support 7 all incline forward synchronously, the chair back 8 is positioned at the position of the bracket 1 in front to be kept in place in the back-following state, and when the chair back 8 is positioned at the position required by a user, the position locking mechanism is closed to fix the position of the chair back 8.

As shown in fig. 3, the specific connection structure of the four-bar linkage mechanism 5 is as follows: the two sides of the main supporting plate 14 of the bracket 1 extend downwards to form a flanging, the front end and the rear end of the flanging are provided with hinge holes, the front connecting rod 2 and the rear connecting rod 3 are respectively hinged through hinge shafts, and the two ends of the base 4 are also respectively hinged to the front connecting rod 2 and the rear connecting rod 3 to form a four-bar mechanism 5.

The front link 2 and the rear link 3 are engaged and hinged to the bracket 1 and the base 4, so that when one of them moves relatively, the other will also be linked correspondingly. For example, when a user sits on the seat, the downward pressure of the weight of the user acts on the bracket 1, the bracket 1 moves forward and downward to drive the front connecting rod 2 and the rear connecting rod 3 to synchronously tilt forward, and after the chair back 8 contacts the waist and back of the user, the leaning force of the user is received, and the back-following action is stopped after the stress reaches balance.

In a more preferable scheme, the above-mentioned position locking mechanism is an air bar 9, as shown in fig. 3-5, the lower end of the air bar 9 is hinged with the front end of the base 4 and the lower end of the front connecting rod 2 through a second hinge shaft B, and the upper end of the air bar 9 is hinged with the rear end of the flanging of the bracket 1 and the upper end of the rear connecting rod 3 through a first hinge shaft a. The air bar 9 is connected with a switch, when a user sits on the seat, the switch of the air bar 9 is turned on, the length of the air bar 9 is changed along with the movement of the four-bar mechanism 5, the movement of the four-bar mechanism 5 is not hindered, and the four-bar mechanism 5 is linked to complete the back following action. When the chair back 8 is positioned at a comfortable position for a user to sit, the switch of the air rod 9 is turned off, the length of the air rod 9 is fixed, the relative position of the four-bar mechanism 5 is fixed, the four-bar mechanism 5 is not linked any more, and the chair back 8 is positioned at a position required by the user.

In a more preferable scheme, the upper end of the chair back support 7 can be fixedly connected with the chair back 8, and the chair back support 7 can also be rotatably connected with the chair back 8. The chair back support 7 is fixedly connected with the chair back 8, so that the chair back support 7 drives the chair back 8 to tilt forwards to realize a back-following function in the back-following process; if the upper end of the chair back bracket 7 is rotationally connected with the chair back 8, a user can automatically adjust the rotation angle of the chair back 8 to meet the requirement of sitting posture in the back-following process.

More preferably, as shown in fig. 1-5, the chair back support 7 is an arc-shaped rod bent towards the front of the chair, and when the chair back support 7 is tilted forwards, the chair back 8 moves forwards and downwards. The chair back 8 is arched in shape protruding toward the front of the chair. The front surface of the chair back 8 is provided with a leaning surface 10 for supporting the back of a human body, and the leaning surface 10 can be connected with a soft cushion such as sponge. The arched arrangement of the chair back 8 ensures that the contact area between the chair back 8 and the waist and back of a human body is gradually increased in the back-following process of the chair back 8 moving forwards and downwards, so that the back-following action is more natural and softer.

As shown in fig. 6, the abutment surface 10 is constituted by an upper part 11, a middle part 12 and a lower part 13. When the chair back 8 is fixedly connected with the chair back support 7, when the chair back support 7 leans forwards, the chair back 8 is close to a user, firstly, the middle part 12 of the leaning surface 10 is contacted with the back of the human body, and if the user is heavier or sits more backwards, the middle part 12 of the leaning surface 10 provides support for the waist and the back of the user; if the user is lighter or sits more forward, the seat back support 7 will continue to tilt forward and the upper portion 11 of the abutment surface 10 will provide support to the user's lumbar back. Such an arrangement can meet the needs of different users in body shapes and sitting postures.

When the chair back 8 is rotatably connected with the chair back support 7, the upper part 11 and the middle part 12 of the leaning surface 10 have almost the same supporting effect on the waist and back and the supporting effect of the fixed connection, but a user can also lean back to the maximum angle, at the moment, the user lies on the chair, and the lower part 13 of the leaning surface 10 of the chair back 8 supports the waist and back of the human body.

The specific use process of the seat provided by the utility model is as follows: as shown in fig. 2-4, when a user sits on the seat, the switch of the air bar 9 is turned on, the four-bar mechanism 5 is in a free motion state, and at this time, the bracket 1 moves forward and downward after receiving the downward pressure from the user's own weight, so as to drive the front bar 2, the rear bar 3 and the chair back support 7 to tilt forward together, the arched chair back 8 moves downward until the chair back 8 contacts the waist back of the user, the chair back 8 is stopped by the leaning force from the back of the user, and when the chair back 8 is in the position required by the user, the switch of the air bar 9 is turned off, so that the position of the chair back 8 is fixed. The above operation is repeated when the user needs to readjust the position of the seatback 8.

While the utility model has been described in terms of specific embodiments, it will be appreciated by those skilled in the art that the utility model is not limited thereto but includes, but is not limited to, those shown in the drawings and described in the foregoing detailed description. Any modifications which do not depart from the functional and structural principles of the present utility model are intended to be included within the scope of the appended claims.

Claims

1. The seat is characterized by comprising a four-bar mechanism formed by a bracket, a front connecting bar, a rear connecting bar and a base, and a position locking mechanism for controlling the four-bar mechanism to stay in a set state, wherein the position locking mechanism is a rod-shaped member which can be lengthened and shortened, the bracket is configured to be provided with a cushion, the rear connecting bar extends upwards to form a seat back bracket, the seat back bracket is connected with a seat back, and the base is connected with a seat support member; when the bracket moves forwards and downwards under the action of downward pressure, the front connecting rod, the rear connecting rod and the chair back support are all synchronously inclined forwards, and the chair back is positioned at the position of the bracket in front so as to be kept in place in a back-following state;

2. A seat as claimed in claim 1, wherein the front and rear ends of the bracket are respectively hinged to upper ends of the front and rear links, and the front and rear ends of the base are respectively hinged to lower ends of the front and rear links.

3. A seat as claimed in claim 1, wherein the position locking mechanism is an air bar.

4. A seat as claimed in claim 3, wherein one end of the air bar is hinged to the front end of the base and the other end of the air bar is hinged to the rear end of the bracket.

5. A seat as claimed in claim 1, wherein the upper end of the seat back support is fixedly connected to the seat back or the upper end of the seat back support is rotatably connected to the seat back.

6. A seat as claimed in claim 1 or claim 5, wherein the seat back support is an arcuate bar curved forwardly of the seat, and the seat back is arcuate in shape projecting forwardly of the seat.

7. A seat as claimed in claim 1, wherein the front surface of the seat back forms an abutment surface for supporting the back of the person, said abutment surface being divided from top to bottom into an upper portion, a middle portion and a lower portion, the upper portion and the middle portion of the abutment surface being arranged to provide a supporting action when the seat back is in the forward position of the carrier.