Seat backrest

Abstract

The utility model provides a seat backrest which is used for solving the technical problem that fatigue of a user is difficult to relieve due to the fact that part of existing seat backrests cannot be attached to the back of the user. The utility model discloses a seat backrest. The seat backrest comprises a backup plate, the mounting seat is fixedly arranged on the backup plate; the two first guide grooves are formed in the mounting seat, and the two first guide grooves are formed in the mounting seat; the limiting plate is adjustably arranged at one end of the mounting seat in a sliding manner; the two sets of screw rods are provided with nuts, and the two sets of screw rods penetrate through the limiting plate and the two corresponding first guide grooves; the two groups of screw rods are in threaded connection with one end of the inner sleeve; the inner sleeve is arranged in the outer sleeve in an adjusting and sliding mode, the backrest moves front and back through mutual movement of the inner sleeve and the outer sleeve, the backrest can move up and down through cooperation of the limiting plate and the mounting base, and by the adoption of the mode, the backrest can be attached to the back of a user, and the requirements of the user are met.

Description

Technical Field

[0001] The utility model relates to the technical field of seats, in particular to a seat backrest. Background Art

[0002] A chair is a piece of furniture with a backrest and sometimes armrests.

[0003] The backrest is a very important part of the seat. A suitable backrest can keep fit with the user's back, thereby relieving the user's fatigue. Although some existing seat backrests can ensure fit with the user by moving up and down, it is difficult to move forward and backward to cope with the user's different sitting postures, which will lead to a decrease in the user's experience and fail to effectively relieve the user's fatigue. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a seat backrest for solving the technical problem that some existing chair backrests cannot keep in close contact with the user's back, making it difficult to relieve the user's fatigue.

[0005] The above technical objectives of the utility model are achieved through the following technical solutions:

[0006] A seat back, comprising:

[0007] leaning board;

[0008] A mounting seat, the mounting seat being fixedly mounted on the backing plate;

[0009] Two first guide grooves, wherein the two first guide grooves are arranged on the mounting seat;

[0010] A limiting plate, the limiting plate being adjustable and slidably arranged at one end of the mounting seat;

[0011] Two groups of screw rods with nuts, the two groups of screw rods passing through the limiting plate and the corresponding two first guide grooves;

[0012] An inner sleeve, wherein the two sets of screw rods are threadedly connected to one end of the inner sleeve;

[0013] The outer sleeve is adjustable and slidably arranged in the outer sleeve.

[0014] Working principle:

[0015] Install the entire backrest on the seat. When the backrest needs to be adjusted forward and backward, pull the backrest, and the backrest drives the limit plate to move through the mounting seat. The limit plate drives the inner sleeve to slide relative to the outer sleeve through two sets of screws with nuts to adjust the front and rear position of the backrest. When the up and down position of the backrest needs to be adjusted, pull the backrest to move up and down, and the backrest drives the mounting seat to move up and down. The mounting seat cooperates with the limit plate to fix the position of the backrest.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] The entire backrest is installed on the seat. When the backrest needs to be adjusted forward and backward, the backrest is pulled, and the backrest drives the limit plate to move through the mounting seat. The limit plate drives the inner sleeve to slide relative to the outer sleeve through two sets of screws with nuts to adjust the front and rear position of the backrest. When the up and down position of the backrest needs to be adjusted, the backrest is pulled up and down, and the backrest drives the mounting seat to move up and down. The mounting seat cooperates with the limit plate to fix the position of the backrest. The front and back movement of the backrest is realized through the cooperation of the inner sleeve and the outer sleeve. The backrest is limited after moving up and down through the cooperation of the mounting seat and the limit plate, so that the backrest can better fit the user's back. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of the utility model;

[0019] Figure 2 This is a schematic structural diagram of another perspective of an embodiment of the utility model;

[0020] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure at AA in the middle.

[0021] In the above drawings: 10, limit rod; 11, first guide plate; 12, support plate; 13, first limit slot; 14, limit plate; 15, screw; 16, first guide slot; 17, placement slot; 18, mounting seat; 19, second limit slot; 20, blocking block; 21, force block; 22, handle; 25, pin; 26, third limit slot; 28, outer sleeve; 29, inner sleeve; 30, second guide slot; 31, abutment plate; 32, limit block; 33, fourth limit slot; 34, second guide plate. DETAILED DESCRIPTION

[0022] The technical solution of the present utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0023] Example:

[0024] like Figure 1 , Figure 2 and Figure 3 As shown, a seat back comprises:

[0025] Backing plate 12;

[0026] A mounting seat 18, wherein the mounting seat 18 is fixedly mounted on the backing plate 12;

[0027] Two first guide grooves 16, the two first guide grooves 16 are formed on the mounting seat 18;

[0028] A limit plate 14, wherein the limit plate 14 is adjustable and slidably disposed at one end of the mounting seat 18;

[0029] Two groups of screw rods 15 with nuts, the two groups of screw rods 15 pass through the limiting plate 14 and the two corresponding first guide grooves 16, and each group of screw rods 15 includes two screw rods;

[0030] Inner sleeve 29, two groups of screw rods 15 pass through two corresponding first guide grooves 16 and are threadedly connected to one end of the inner sleeve 29;

[0031] The outer sleeve 28, the inner sleeve 29 is adjustable and slidably arranged in the outer sleeve 28;

[0032] The entire backrest is installed on the seat. When the backrest 12 needs to be adjusted forward and backward, the backrest 12 is pulled, and the backrest 12 drives the limiting plate 14 to move through the mounting seat 18. The limiting plate 14 drives the inner sleeve 29 to slide relative to the outer sleeve 28 through two sets of screws 15 with nuts to adjust the front and rear position of the backrest 12. When the up and down position of the backrest 12 needs to be adjusted, the backrest 12 is pulled to move up and down, and the backrest 12 drives the mounting seat 18 to move up and down. The mounting seat 18 cooperates with the limiting plate 14 to fix the position of the backrest 12, and the front and rear movement of the backrest 12 is achieved through the cooperation of the inner sleeve 29 and the outer sleeve 28. The backrest 12 after moving up and down is limited through the cooperation of the mounting seat 18 and the limiting plate 14, so that the backrest 12 can better fit the user's back.

[0033] like Figure 2 and 3 As shown, the limiting plate 14 is provided with a through placement groove 17, and a limiting rod 10 is fixedly provided on the inner wall of one side of the placement groove 17, and the limiting rod 10 is elastic. A first guide plate 11 is fixedly provided on the mounting seat 18, and two first guide grooves 16 are provided on both sides of the first guide plate 11, and the first guide plate 11 is opposite to the limiting plate 14. A plurality of first limiting grooves 13 cooperating with the limiting rod 10 are provided at one end of the first guide plate 11 close to the limiting plate 14, and the bottom end of the limiting rod 10 extends into one of the first limiting grooves 13, and the bottom end of the limiting rod 10 is clamped with the first limiting groove 13, thereby limiting the positional relationship between the limiting plate 14 and the mounting seat 18.

[0034] like Figure 1 and Figure 3 As shown, four second guide grooves 30 are provided on both side end faces of the outer circumference of the inner sleeve 29, and four second guide plates 34 are fixedly provided on both side inner walls of the outer sleeve 28. The second guide plates 34 correspond to the second guide grooves 30 one by one, and the second guide plates 34 are slidably arranged in the second guide grooves 30 one by one. This matching mode further enhances the stability between the inner sleeve 29 and the outer sleeve 28.

[0035] like Figure 3 As shown, the top wall of the inner sleeve 29 is provided with a T-shaped second limiting groove 19, and the top wall of the inner sleeve 29 is provided with two third limiting grooves 26, each of which is fixed with abutment plates 31, and the top of the outer sleeve 28 is fixed with two limiting blocks 32, and the top of the outer sleeve 28 is provided with a fourth limiting groove 33, and a pin 25 is fixed between the two limiting blocks 32, and a handle 22 is rotatably provided on the pin 25, and one end of the handle 22 passes through the fourth limiting groove 33 and extends into the second limiting groove 19, and after the handle 22 is rotated, one end of the handle 22 It can also pass through the fourth limiting groove 33 and extend into the third limiting groove 26, and the handle 22 extends into the second limiting groove 19 and the third limiting groove 26, so as to limit the movement of the inner sleeve 29 and the outer sleeve 28. A blocking block 20 is fixedly arranged at the top of the outer sleeve 28, and an elastic force-bearing block 21 is fixedly arranged at one end of the handle 22. The force-bearing block 21 is triangular and elastic. When the handle 22 is rotated clockwise around the pin 25, the handle 22 drives the force-bearing block 22 to rotate, and the force-bearing block 22 undergoes elastic deformation and disengages from the blocking block 20, and the force-bearing block 21 is engaged with the blocking block 20.

[0036] Working principle:

[0037] The backrest is installed on the seat. When the backrest needs to be adjusted forward and backward, the handle 22 is manually turned. The handle 22 rotates clockwise around the pin shaft 25. The handle 22 drives the force block 21 to rotate. The force block 21 undergoes elastic deformation, and the force block 21 is disengaged from the blocking block 20. One end of the handle 22 leaves the second limiting groove 19 and pulls the back plate 12 forward. The back plate 12 drives the limiting plate 14 to move through the mounting seat 18. The limiting plate 14 drives the inner sleeve 29 to move relative to the outer sleeve 28 through the screw 15. When the backrest needs to be adjusted up and down, the back plate 12 is manually moved. The back plate 12 drives the mounting seat 18 to move, and the mounting seat 18 drives the first guide plate 11 to move. After the movement is completed, the bottom end of the limiting rod 10 extends into one of the first limiting grooves 13.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A seat back, characterized in that: include: Backing plate (12); A mounting seat (18), wherein the mounting seat (18) is fixedly mounted on the backing plate (12); Two first guide grooves (16), the two first guide grooves (16) being arranged on the mounting seat (18); A limiting plate (14), wherein the limiting plate (14) is adjustable and slidably arranged at one end of the mounting seat (18); Two groups of screw rods (15) with nuts, the two groups of screw rods (15) passing through the limiting plate (14) and the corresponding two first guide grooves (16); An inner sleeve (29), wherein the two sets of screw rods (15) are threadedly connected to one end of the inner sleeve (29); The outer sleeve (28) is provided with an inner sleeve (29) which is adjustable and slidably arranged inside the outer sleeve (28).

2. A seat back according to claim 1, characterized in that: The limiting plate (14) is provided with a through placement groove (17), and a limiting rod (10) is fixedly provided on an inner wall of one side of the placement groove (17).

3. A seat back according to claim 2, characterized in that: A first guide plate (11) is fixedly provided on the mounting seat (18), two first guide grooves (16) are provided on both sides of the first guide plate (11), the first guide plate (11) is opposite to the limiting plate (14), and a plurality of first limiting grooves (13) cooperating with the limiting rod (10) are provided at one end of the first guide plate (11) close to the limiting plate (14).

4. The seat back according to claim 1, characterized in that: Four second guide grooves (30) are provided on both side end surfaces of the outer circumference of the inner sleeve (29).

5. A seat back according to claim 4, characterized in that: Four second guide plates (34) are fixedly provided on the inner walls of both sides of the outer sleeve (28), and the second guide plates (34) correspond one to one to the second guide grooves (30).

6. The seat back according to claim 1, characterized in that: The top wall of the inner sleeve (29) is provided with a T-shaped second limiting groove (19) extending upward and downward, and the top wall of the inner sleeve (29) is provided with two third limiting grooves (26) extending upward and downward, and each of the third limiting grooves (26) is fixedly provided with an abutment plate (31).

7. The seat back according to claim 6, characterized in that: Two limiting blocks (32) are fixedly arranged at the top of the outer sleeve (28), a fourth limiting groove (33) is opened at the top of the outer sleeve (28), a pin shaft (25) is fixedly arranged between the two limiting blocks (32), a handle (22) is rotatably arranged on the pin shaft (25), and one end of the handle (22) passes through the fourth limiting groove (33) and extends into the second limiting groove (19).

8. The seat back according to claim 7, characterized in that: A blocking block (20) is fixedly arranged at the top end of the outer sleeve (28), and an elastic force-bearing block (21) is fixedly arranged at one end of the handle (22), wherein the force-bearing block (21) is clamped with the blocking block (20).

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