CN113951658B

CN113951658B - Chair and front-turning adjustable backrest

Info

Publication number: CN113951658B
Application number: CN202111307070.8A
Authority: CN
Inventors: 孙明亮
Original assignee: Zhejiang Runda Kehong Furniture Co ltd
Current assignee: Zhejiang Runda Kehong Furniture Co ltd
Priority date: 2021-11-05
Filing date: 2021-11-05
Publication date: 2022-06-24
Anticipated expiration: 2041-11-05
Also published as: WO2023077559A1; CN113951658A

Abstract

The utility model provides a chair and back, wherein, the back includes back base member, backs the portion, back position in the front side of back base member and with the back base member is articulated mutually, back portion can turn over forward and turn up back support angle, still include and restrict the back portion after the forward upset of back portion and overturn stop device after preventing that back portion overturns backward. According to the invention, when the back support angle is increased, the space occupation of the chair can be reduced as much as possible, the walking influence on workers in an office environment is small, and more chairs can be more reasonably arranged under the condition of small space.

Description

Chair and front-turning adjustable backrest

Technical Field

The invention relates to a chair and a backrest, and belongs to the field of rest equipment.

Background

The chair is one of essential articles for daily life of people, and brings convenience for rest and office work of people.

In one of the functions pursued by the chair, it is necessary to adjust the inclination angle of the backrest of the chair, so as to adjust the back support angle { the angle between the support force of the backrest to the back of the human body and the horizontal plane is called as the back support angle, see fig. 8 }, so that the user can obtain the requirements of different back support angles, for example, in the working state, the required back support angle is small, the inclination angle of the backrest is small, the back of the human body is easy to straighten, the working state is easy to tighten when the user works, in the rest state, the required back support angle is larger, the inclination angle of the backrest is larger, and the user is easy to relax.

Chinese patent with application number CN202021018964.6 discloses a chair with waist rest adjusting device, including chair body and the back of rotation installation on the chair body, the rotation groove has been seted up at the top of chair body, rotate on the both sides inner wall in rotation groove and install same dwang, and the fixed cover of back is established on the dwang, fixed cover is equipped with the fixing base on the dwang, the outside of fixing base is annular equidistant a plurality of draw-in grooves of having seted up, set up threaded hole on one side inner wall in rotation groove, threaded hole internally thread installs fixing bolt, and fixing bolt and the draw-in groove looks adaptation that corresponds, first groove has been seted up to one side of back, slidable mounting has the arc waist to prop in the first groove, one side that the arc waist propped extends to the outside of back and fixed the installation has the protection pad. In this patent, the foretell function has been realized, however, the back is installed on the chair body and the structural feature of back itself with the rotation mounting means, has decided that the user can only be backward upset when increaseing back support angle, and the back of backward upset can make the chair occupation space big, in office environment, causes the influence to staff's walking about, simultaneously, also is difficult to rationally arrange more chairs in the less environment in space.

Disclosure of Invention

In response to the deficiencies of the prior art, the present invention is directed to a chair and a chair back.

A backrest is characterized by comprising a backrest base body fixedly connected to a seat, and a backrest part, wherein the backrest part is positioned at the front side of the backrest base body and is hinged with the backrest base body through a hinge shaft, and the backrest part is forwards turned by taking the hinge shaft as a rotation center to adjust the back supporting angle; the backrest device also comprises a rear overturning stop device which limits the backrest part after the backrest part overturns forwards so as to prevent the backrest part from overturning backwards.

In the technical scheme, the structure of the backrest and the connection mode of the backrest and the chair seat are changed by the backrest, the backrest part of the backrest is turned forwards to increase the back support angle, the turned backrest part can be in the horizontal projection range of the chair seat, and the positions of the rest parts of the backrest, namely the backrest base body, do not change, so that the occupied space of the chair can be reduced as much as possible when the back support angle is increased, the walking influence on workers in the office environment is small, and more chairs can be reasonably arranged under the condition of small space.

Preferably, the rear turnover stopping device comprises a movable connecting structure for connecting the backrest part and the backrest base body; the movable connecting structure comprises a sliding part which is hinged on the backrest part and provided with a sliding channel, and a sliding base part which is hinged on the backrest base body, wherein the sliding base part is limited in the sliding channel, and the sliding part can slide on the sliding base part; and the stop mechanism is used for limiting the sliding piece after the backrest part is turned forwards.

Preferably, the stop mechanism comprises a stop block with a stop part and a stop matching block arranged in the sliding channel, a stop block rotating shaft for mounting the stop block is arranged on the sliding base part, the surface of the sliding base part facing the stop matching block is concavely formed into a mounting area for mounting the stop block, a supporting part for supporting the stop block in a rotation prevention manner is arranged in the mounting area, and the stop matching block is provided with a plurality of stop hook grooves which are distributed along the length direction of the sliding channel and are used for matching with the stop part for stopping; the stop hook groove comprises a hook part and a leading-out part connected with the hook part, and the leading part guides the stop block to slip off from the stop hook groove when the backrest part turns forwards.

Preferably, the center of gravity of the stop block is located between the stop block rotating shaft and the stop hook groove.

Preferably, the elastic pressure mechanism comprises a torsion spring, and the elastic pressure mechanism provides an elastic force to enable the stopping part to enter the stopping hook groove.

Preferably, the slider is still including connecting go up spacing board and the left spacing board and the right spacing board of lower spacing board, be provided with on left side spacing board and the right spacing board and let and be located the groove of stepping down of stop block pivot, the stop block pivot passes the groove of stepping down.

Preferably, an operating member connected to the stopper pivot is provided to a side of the slider.

Preferably, the stop mechanism comprises a lock plate which is connected with the upper limit plate part and the lower limit plate part and is provided with lock holes, a plurality of lock hole matching holes which are arranged on the side surface of the sliding base part and are distributed linearly, and a lock rod.

A chair comprising the backrest according to any of the above claims.

In conclusion, the invention has the following beneficial effects:

1: according to the invention, the backrest part of the backrest is turned forwards to increase the back support angle, so that the turned backrest part is positioned in the horizontal projection range of the chair seat, and the positions of the rest parts of the backrest, namely the backrest base body, are not changed, therefore, the chair can reduce the space occupation as much as possible when the back support angle is increased, the influence on the walking of workers in an office environment is less, and more chairs can be more reasonably arranged under the condition of small space.

2: according to the invention, the stop hook groove is specially arranged, when the backrest part is turned forwards, only the turning force for turning the backrest part forwards needs to be given, the stop mechanism does not need to be operated, and the back support angle can be conveniently and quickly increased.

3: according to the invention, the gravity center of the stop block is positioned between the stop block rotating shaft and the stop hook groove, the stop block can enter the next stop hook groove in a self-adaptive manner under the action of the gravity of the stop block, and other auxiliary parts are not involved to assist the stop part to enter the stop hook groove when the effect is realized.

Drawings

FIG. 1 is a schematic diagram of a backrest structure;

FIG. 2 is an exploded view of the rear roll stop device in a first viewing angle;

FIG. 3 is an exploded view of the rear roll stop device in a second viewing angle;

FIG. 4 is a cross-sectional schematic view of the rear roll stop device;

FIG. 5 is a schematic diagram of the engagement of the stop mechanism;

FIG. 6 is a schematic structural diagram of a stop block;

FIG. 7 is a rear roll stop with the stop block of FIG. 6;

FIG. 8 is a schematic view of a prior art back support angle;

fig. 9 is a schematic structural view of the backrest portion.

Detailed Description

The invention will be further explained by means of specific embodiments with reference to the drawings.

Example (b): as shown in fig. 1-4, a backrest comprises a backrest base 1, a backrest 2, the backrest base 1 is used to be fixedly connected to a seat, the bottom of the backrest base 1 is provided with a seat connecting part 11, which is connected to the seat through the seat connecting part 11, the backrest 2 provides a supporting force for the human body back, the backrest 2 is located at the front side of the backrest base 1 and is hinged with the backrest base 1 through a hinge shaft 4, preferably, the upper two sides of the backrest 2 are hinged with the backrest base 1 through the hinge shaft 4, the backrest base 1 can be but not limited to a frame structure, the bottom of the backrest 2 is located above the seat connecting part 11 and is close to the seat connecting part 11 in the vertical direction, the backrest 2 is turned forwards by using the hinge shaft 4 as a rotation center to adjust the supporting angle { as described in the background art, the supporting force of the backrest to the human body back and the included angle of the backrest are called as back supporting angle, referring to fig. 8, compared with the prior art, the backrest changes the connection mode with the seat and the structure thereof, the backrest 2 of the backrest is turned forward to adjust the back support angle, so that the turned backrest 2 is in the horizontal projection range of the seat, and the rest part of the backrest, namely the position of the backrest base body 1, is not changed, so that the space occupation of the chair can be reduced as much as possible when the back support angle is adjusted, the walking influence on workers in an office environment is small, more chairs can be more reasonably arranged under the condition of small space, and the backrest further comprises a rear turning stopping device 3 which limits the backrest 2 after the backrest 2 is turned forward to prevent the backrest 2 from turning backward.

Specifically, the rear-turnover stopper 3 includes a movable connecting structure 31 connecting the backrest portion 2 and the backrest base 1, the movable connecting structure 31 includes a slider 311 hinged on the backrest portion 2 and having a sliding channel 3111, and a sliding base member 312 hinged on the backrest base 1, hinge seats 00 hinged on the backrest portion 2 and the backrest base 1 and respectively provided with the slider 311 and the sliding base member 312, the slider 311 includes a hinge portion 3112, and an upper limiting plate portion 3113 and a lower limiting plate portion 3114 connected with the hinge portion 3112, the sliding channel 3111 is formed between the upper limiting plate portion 3113 and the lower limiting plate portion 3114, the sliding base member 312 is limited in the sliding channel 3111, when the backrest portion 2 is turned forward, the slider 311 rotates relative to the backrest portion 2 through the hinge portion 3112, and the sliding base member 312 also rotates relative to the backrest base 1, the sliding member 311 slides on the sliding base member 312, the rear-turning stopping device 3 further includes a stopping mechanism 32, the stopping mechanism 32 limits the sliding member 311 after the backrest portion 2 is turned forward, so as to achieve the purpose of limiting the backrest portion 2 after the backrest portion 2 is turned forward, wherein one of the stopping mechanisms 32 is configured as follows: the stop mechanism 32 includes a stop block 321 having a stop portion 3211 and a force-receiving portion 3212, a stop mating block 322 disposed in the sliding channel 3111, a stop block rotating shaft 323 for mounting the stop block 321 is disposed on the sliding base member 312, a surface of the sliding base member 312 facing the stop mating block 322 is concavely formed into a mounting area 327, the stop block rotating shaft 323 passes through the mounting area 327, the stop block 321 is located in the mounting area 327, i.e., the stop block 321 is limited in the mounting area 327, a supporting portion 324 for anti-rotatably supporting the stop block 321 is disposed in the mounting area 327, the stop mating block 322 is provided with a plurality of stop hook grooves 325 distributed along the length direction of the sliding channel 3111 for cooperating with the stop portion 3211, when the stop portion 3211 is fitted in the stop hook grooves 325, the supporting portion 324 supports the force-receiving portion 3212 of the stop block 321, providing a torque which can act on the stop block 321 equal to the torque of the sliding member 311, the stopper 321 is brought to a stationary state. The stop hook groove 325 comprises a hook part 3251 and a lead-out part 3252 connected with the hook part 3251, the hook part 3251 hooks on the stop part 3211 when the stop part 3211 is matched with the stop hook groove 325, so that the stop part 3211 can play a stop role, the lead-out part 3252 lifts the stop part 3211 when the backrest part 2 turns forwards, and the stop block 321 is guided to slip from the stop hook groove 325 and enter the other stop hook groove 325.

In order to make the stopper 3211 on the stopper 321 adaptively enter the next stopper groove 325 after the guiding portion 3252 lifts the stopper 3211, the elastic pressure mechanism 326 is further included, the elastic pressure mechanism 326 is a torsion spring, the torsion spring is sleeved on the stopper rotating shaft 323, one end of the torsion spring can abut against the stopper 321, and the other end of the torsion spring can abut against the inner wall of the installation area 327, so as to provide an elastic force to make the stopper 3211 enter the stopper groove 325. The stop block 321 is further provided with a receiving groove 3213 for receiving the torsion spring, which defines an axial position of the torsion spring on the stop block rotation shaft 323.

Similarly, in order to make the stopper 3211 of the stopper 321 adaptively enter the next stopper groove 325 after the guiding portion 3252 lifts the stopper 3211, in another embodiment, the center of gravity of the stopper 321 is located between the stopper rotating shaft 323 and the stopper groove 325, and in order to make the center of gravity located at this position, as shown in fig. 6-7, a weight-reducing groove 3214 may be formed on the force-receiving portion 3212, and of course, a weight-increasing body may be disposed on the stopper 3211. The stopper 321 is adapted to enter the next stopper groove 325 under the influence of the gravity of the stopper 321 itself, and when this effect is achieved, no other auxiliary component is involved to assist the stopper portion 3211 to enter the stopper groove 325, and the whole stopper mechanism 32 has a small number of parts, a simplified structure, and is more convenient to install and manufacture.

Preferably, the slider 311 further includes a left limiting plate portion 3115 and a right limiting plate portion 3116 connecting the upper limiting plate portion 3113 and the lower limiting plate portion 3114, the structural strength of the slider 311 can be enhanced by the left limiting plate portion 3115 and the right limiting plate portion 3116, the service life of the backrest is prolonged, the receding groove 3117 of the stopper rotating shaft 323 is provided on the left limiting plate portion 3115 and the right limiting plate portion 3116, and the stopper rotating shaft 323 passes through the receding groove 3117.

Just because of the movable connection structure 31 connecting the backrest 2 with the backrest base 1, when the backrest 2 needs to be adjusted to the original angle, the stop block rotating shaft 323 is rotated to disengage the stop portion 3211 from the stop hook groove 325, the backrest 2 is held by the matching hand to slowly turn back the backrest 2, after the backrest 2 is reset, the stop block rotating shaft 323 is released, and the backrest 2 is conveniently reset.

Further, an operating member 33 connected to the stopper pivot 323 is provided at a side of the slider 311, the operating member 33 may be, but not limited to, a handle, and the operation of rotating the stopper pivot 323 by the operating member 33 is simplified.

Another structure of the stop mechanism 32 is: as shown in fig. 5, the stopper mechanism 32 includes a lock plate 328 having a lock hole 3281, which connects the upper stopper plate portion 3113 and the lower stopper plate portion 3114, a plurality of lock hole mating holes 3282 provided in a straight line on the side surface of the slide base member 312, and a lock lever 329. The stopping mechanism is as follows: when the backrest 2 is turned forward, the lock bar 329 is inserted into the lock hole 3281 and one of the lock hole mating holes 3282 to restrain the slider 311.

In consideration of material cost, weight and comfort of the backrest part 2, as shown in fig. 9, the backrest part 2 comprises a frame body 21 and a mesh fabric 22 connected with the frame body 21, the mesh fabric 22 is used for supporting the back of a human body and providing better comfort for the human body, and the frame body 21 and the mesh fabric 22 are combined together to reduce the material cost and the weight. The curved portion 20 is formed by bending the frame 21 toward the backrest base 1 corresponding to the bottom of the waist of the human body, which can better meet the ergonomics, but due to the curved bottom of the frame 21, the frame 21 is formed into a curved contour, which results in that the mesh fabric 22 cannot be well mounted on the frame 21, which is a special-shaped structure, and for this reason, the frame 21 further includes an upper frame 211 and a lower frame 212 connected to the bottom of the upper frame 211, and the curved portion 20 is located on the lower frame 212.

The embodiment also relates to a chair comprising the backrest.

The above-described embodiments are merely illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention. Various modifications and improvements of the technical solutions of the present invention that are made by those skilled in the art without departing from the design concept of the present invention shall fall within the protection scope of the present invention, and the technical contents of the present invention that are claimed shall be fully described in the claims.

Claims

1. A backrest is characterized by comprising a backrest base body (1) fixedly connected to a seat, and a backrest part (2), wherein the backrest part (2) is positioned at the front side of the backrest base body (1) and is hinged with the backrest base body (1) through a hinged shaft (4), and the backrest part (2) is forwards overturned by taking the hinged shaft (4) as a rotation center to increase a back support angle; the backrest part (2) is limited after being turned forwards so as to prevent the backrest part (2) from being turned backwards, and the backrest part (2) is also provided with a back turning stop device (3);

the rear overturning stop device (3) comprises a movable connecting structure (31) which connects the backrest part (2) and the backrest base body (1); the movable connecting structure (31) comprises a sliding part (311) which is hinged to the backrest part (2) and provided with a sliding channel (3111), and a sliding base part (312) which is hinged to the backrest base body (1), wherein the sliding base part (312) is limited in the sliding channel (3111), the sliding part (311) can slide on the sliding base part (312), the sliding part (311) comprises a hinged part (3112), an upper limiting plate part (3113) and a lower limiting plate part (3114) which are connected with the hinged part (3112), and the sliding channel (3111) is formed between the upper limiting plate part (3113) and the lower limiting plate part (3114);

the backrest part (2) is turned forwards, and then the sliding part (311) is limited by the stop mechanism (32);

the stop mechanism (32) comprises a stop block (321) with a stop part (3211) and a stop matching block (322) arranged in the sliding channel (3111), a stop block rotating shaft (323) for mounting the stop block (321) is arranged on the sliding base member (312), a mounting area (327) capable of mounting the stop block (321) is formed by recessing the surface of the sliding base member (312) facing the stop matching block (322), a supporting part (324) for supporting the stop block (321) in a rotation-proof way is arranged in the mounting area (327), and the stop matching block (322) is provided with a plurality of stop hook grooves (325) which are distributed along the length direction of the sliding channel (3111) and are used for matching and stopping with the stop part (3211); the stop hook groove (325) comprises a hook part (3251) and a guide part (3252) connected with the hook part (3251), and the guide part guides the stop block (321) to slip off from the stop hook groove (325) when the backrest part (2) turns forwards;

an operating component (33) connected with the stop block rotating shaft (323) is arranged on the side of the sliding piece (311).

2. The backrest according to claim 1, wherein the stopper (321) has a center of gravity between the stopper pivot (323) and the stopper hook groove (325).

3. The backrest of claim 1, further comprising a resilient pressure mechanism (326), the resilient pressure mechanism (326) comprising a torsion spring providing a resilient force to move the stopper portion (3211) into the stopper groove (325).

4. The backrest according to claim 1, wherein the sliding member (311) further comprises a left limiting plate portion (3115) and a right limiting plate portion (3116) connecting the upper limiting plate portion (3113) and the lower limiting plate portion (3114), a recess (3117) is disposed on the left limiting plate portion (3115) and the right limiting plate portion (3116) and the stopper rotating shaft (323) passes through the recess (3117).

5. The backrest according to claim 1, characterized in that the backrest part (2) comprises a frame body (21) and a mesh (22) connected with the frame body (21), the frame body (21) is bent to the backrest base body (1) corresponding to the bottom of the waist of the human body to form a bending part (20); the frame body (21) comprises an upper frame body (211) and a lower frame body (212) connected with the bottom of the upper frame body (211), and the bending part (20) is positioned on the lower frame body (212).

6. A chair comprising the backrest of claim 1 or 2 or 3 or 4 or 5.