Adjustable waist-back structure for rotary chair

Abstract

The utility model discloses an adjustable waist back structure for a rotary chair, which comprises a backrest support and a chassis, the backrest support is mounted at the rear end of the chassis, a lifting support is movably arranged on the backrest support, a backrest main body is positioned and mounted on the inner side of the lifting support, a torsion regulator is integrally positioned at the bottom of the backrest main body, and the torsion regulator is connected with the lifting support. A waist bag structure is adjustably positioned at the front end of the torsion adjuster, an adjusting knob is arranged at the rear end of the torsion adjuster, a torsion adjusting frame is connected between the backrest body and the waist bag structure, and a torsion spring is arranged on the torsion adjusting frame. According to the adjustable waist-back structure for the rotary chair, the waist bag front top gravity adjusting structure and the backrest lifting adjusting structure are arranged, so that the front top gravity of the waist bag can be conveniently adjusted, the waist position can be better supported, the adjustable waist-back structure is suitable for more users with different weights, the height of the backrest can be conveniently adjusted, and the adjustable waist-back structure is convenient to use. And the device is suitable for more users with different heights.

Description

TECHNICAL FIELD

[0001] The utility model relates to a rotary chair backrest structure field, especially in kind of adjustable waist and back structure for rotary chair. BACKGROUND

[0002] The adjustable waist and back structure for rotary chair is a support structure for adjusting the front top gravity of the seat backrest, which stably supports the back and waist positions of the user when the user uses it, and is an important component of the rotary chair.

[0003] The existing waist and back structure for rotary chair has certain disadvantages in use. First, the existing waist and back structure for rotary chair is a fixed structure in use, and the waist support position cannot be well adjusted. The support force provided by the waist support needs to be different for users with different weights, and the existing waist support cannot adjust the support force, which is not suitable for more users. In addition, the backrest cannot be raised and lowered for users with different heights, which is also not suitable for more users, thereby causing certain adverse effects on the actual use process. Therefore, the adjustable waist and back structure for rotary chair is proposed. SUMMARY

[0004] In view of the deficiencies of the prior art, the adjustable waist and back structure for rotary chair is provided with a waist support front top gravity adjusting structure and a backrest lifting adjusting structure, which can conveniently adjust the front top gravity of the waist support, better support the waist position, adapt to more users with different weights, and also conveniently adjust the height of the backrest, adapt to more users with different heights, and effectively solve the problems in the background art.

[0005] To achieve the above-mentioned purpose, the technical scheme adopted by the utility model is as follows: an adjustable waist and back structure for rotary chair, comprising a backrest support and a chassis, the backrest support is installed at the rear end of the chassis, a lifting support is movably arranged on the backrest support, a backrest body is positioned and installed on the inner side of the lifting support, a torsion adjuster is integrally positioned at the bottom of the backrest body, a waist support structure is adjustably positioned at the front end of the torsion adjuster, an adjusting knob is arranged at the rear end of the torsion adjuster, a torsion adjusting frame is connected between the backrest body and the waist support structure, a torsion spring is arranged on the torsion adjusting frame, a limiting sheet, a threaded rod, a torsion spring block, an adjusting thread, a torsion spring shaft seat and a knob connector are installed inside the torsion adjuster, the knob connector is clamped between the adjusting knob, the torsion spring is connected with the torsion spring shaft seat, the threaded rod penetrates through the limiting sheet, the torsion spring block is positioned outside the threaded rod, the torsion spring shaft seat is located at both ends of the torsion spring block, and an adjustable locking structure is arranged at the position where the inner side of the lifting support is movably arranged on the backrest support.

[0006] Preferably, the rotating knob drives the knob connector to rotate synchronously, and the knob connector adjusts the torsion spring pressing block through the adjusting thread to increase or decrease the pre-tightening force of the torsion spring.

[0007] Preferably, the lifting support moves up and down to adjust the outer ring of the back support, and the lifting support is positioned and clamped in the outer ring of the back support through the adjustable locking structure.

[0008] Preferably, the back body and the lifting support are integrally formed by injection molding, the waist bag structure is adjusted in the front top position of the lower end of the back body, and the adjustment is controlled through the adjusting knob.

[0009] Preferably, the pre-tightening force of the adjusting knob and the knob connector at the torsion spring position is adjusted, so that the position of the torsion adjusting frame is adjusted through the torsion spring, and the waist bag structure is adjusted in the front top position.

[0010] Preferably, the limiting sheet and the torsion adjuster are fixed through bolts, and the limiting sheet limits the position of the threaded rod.

[0011] Compared with the prior art, the adjustable waist and back structure for a swivel chair has the following beneficial effects: the adjustable waist and back structure for a swivel chair is provided with a waist bag front top gravity adjusting structure and a back lifting adjusting structure, can conveniently adjust the front top gravity of the waist bag, better supports the waist position, adapts to more users with different weights, can also conveniently adjust the height of the back, adapts to more users with different heights, drives the knob connector to rotate synchronously, the knob connector adjusts the torsion spring pressing block through the adjusting thread to increase or decrease the pre-tightening force of the torsion spring, the back body and the lifting support are integrally formed by injection molding, the waist bag structure is adjusted in the front top position of the lower end of the back body, and the adjustment is controlled through the adjusting knob, the pre-tightening force of the adjusting knob and the knob connector at the torsion spring position is adjusted, so that the position of the torsion adjusting frame is adjusted through the torsion spring, and the waist bag structure is adjusted in the front top position, the lifting support moves up and down to adjust the outer ring of the back support, and the lifting support is positioned and clamped in the outer ring of the back support through the adjustable locking structure, the lifting support drives the back body to move up and down, the whole adjustable waist and back structure for a swivel chair is simple in structure, convenient to operate, and has a better use effect than the traditional way. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a whole structure schematic view of the adjustable waist and back structure for a swivel chair.

[0013] Figure 2The utility model discloses a structure diagram of the rear part of the backrest support of the adjustable waist and back structure for a rotary chair.

[0014] Figure 3 The utility model discloses a structure diagram of the decomposition of the torsion adjuster in the adjustable waist and back structure for a rotary chair.

[0015] Figure 4 The utility model discloses a structure diagram of the torsion adjuster in the adjustable waist and back structure for a rotary chair.

[0016] In the drawing: 1, backrest support; 2, base plate; 3, torsion adjuster; 4, adjusting knob; 5, lifting support; 6, waist bag structure; 7, backrest main body; 8, torsion spring; 9, torsion adjuster; 10, limiting sheet; 11, threaded rod; 12, knob connector; 13, torsion spring pressing block; 14, torsion spring axle seat; 15, adjusting screw; 16, adjustable locking structure. DETAILED DESCRIPTION

[0017] The technical scheme of the utility model will be described clearly and completely in connection with the drawings and specific embodiments.

[0018] As Figures 1-4 shown, an adjustable waist and back structure for a rotary chair, including backrest support 1 with base plate 2, backrest support 1 is installed at the rear end of base plate 2, and the lifting support 5 is movably arranged on the backrest support 1, the inner side of the lifting support 5 is positioned and installed with the backrest main body 7, the bottom of the backrest main body 7 is integrally positioned with the torsion adjuster 3, the front end of the torsion adjuster 3 is adjustably positioned with the waist bag structure 6, the rear end of the torsion adjuster 3 is provided with the adjusting knob 4, the backrest main body 7 is connected with the waist bag structure 6 with the torsion adjuster 9, the torsion adjuster 9 is provided with the torsion spring 8, the inside of the torsion adjuster 3 is installed with the limiting sheet 10, the threaded rod 11, the torsion spring pressing block 13, the adjusting screw 15, the torsion spring axle seat 14 and the knob connector 12, the knob connector 12 is clamped between the adjusting knob 4, the torsion spring 8 is connected between the torsion spring axle seat 14, the threaded rod 11 penetrates the limiting sheet 10, the torsion spring pressing block 13 is positioned outside the threaded rod 11, the torsion spring axle seat 14 is located at both ends of the torsion spring pressing block 13, the inner side of the lifting support 5 is provided with the adjustable locking structure 16 at the movable position on the backrest support 1, the waist bag front top gravity adjusting structure and the backrest lifting adjusting structure are provided, the front top gravity of the waist bag can be conveniently adjusted, the waist position is better supported, more different weight users are adapted, the backrest height can be conveniently adjusted, and more different height users are adapted.

[0019] Further, when the adjusting knob 4 rotates, the knob connector 12 is driven to rotate synchronously, and the knob connector 12 adjusts the torsion spring pressing block 13 through the adjusting screw 15 to increase or reduce the torsion spring pre-tightening force.

[0020] Further, the lifting support 5 is adjusted up and down on the outer ring of the back support 1, and the lifting support 5 is positioned and clamped on the outer ring of the back support 1 through the adjustable locking structure 16, and the lifting support 5 drives the back body 7 to lift.

[0021] Further, the back body 7 and the lifting support 5 are integrally formed by injection molding, the waist bag structure 6 is adjusted in front of the lower end position of the back body 7, and the adjustment knob 4 is adjusted and controlled.

[0022] Further, the adjustment knob 4, the knob connector 12 adjust the pre-tightening force at the torsion spring 8, so that the position of the torsion adjusting frame 9 is adjusted by the torsion spring 8, and the torsion adjusting frame 9 drives the waist bag structure 6 to adjust the front top adjustment.

[0023] Further, the limiting sheet 10 and the torsion adjuster 3 are fixed through bolts, and the limiting sheet 10 limits the position of the threaded rod 11.

[0024] Working principle: the utility model discloses a back support 1, bottom disc 2, torsion adjuster 3, adjustment knob 4, lifting support 5, waist bag structure 6, back body 7, torsion spring 8, torsion adjusting frame 9, limiting sheet 10, threaded rod 11, knob connector 12, torsion spring pressing block 13, torsion spring shaft seat 14, adjusting screw 15, adjustable locking structure 16, when the adjustment knob 4 rotates, knob connector 12 is rotated synchronously, the knob connector 12 adjusts torsion spring pressing block 13 through adjusting screw 15 to increase and reduce torsion spring pre-tightening force, the back body 7 and the lifting support 5 are integrally formed by injection molding, the waist bag structure 6 is adjusted in front of the lower end position of the back body 7, and the adjustment knob 4 is adjusted and controlled, the adjustment knob 4, the knob connector 12 adjust the pre-tightening force at the torsion spring 8, so that the position of the torsion adjusting frame 9 is adjusted by the torsion spring 8, and the torsion adjusting frame 9 drives the waist bag structure 6 to adjust the front top adjustment, the lifting support 5 is adjusted up and down on the outer ring of the back support 1, and the lifting support 5 is positioned and clamped on the outer ring of the back support 1 through the adjustable locking structure 16, and the lifting support 5 drives the back body 7 to lift, and the utility model discloses a waist bag front top gravity adjusting structure and back lifting adjusting structure, can conveniently adjust the front top gravity of the waist bag, better supports the waist position, adapts to more different weight users, can also conveniently adjust the back height, adapts to more different height users. The basic principle and main features of the utility model and the advantages of the utility model are shown and described. The technical personnel of the industry should know that the utility model is not limited by the above examples, and the above examples and the description in the specification only illustrate the principle of the utility model, and various changes and improvements of the utility model fall within the scope of the utility model.

Claims

1. An adjustable lumbar and back structure for a swivel chair comprising a backrest support (1) and a base plate (2), characterized in that: The backrest support (1) is installed at the rear end of the chassis (2), the lifting support (5) is movably arranged on the backrest support (1), the inner side of the lifting support (5) is positioned and installed with the backrest body (7), the bottom of the backrest body (7) is integrally positioned with the torsion adjuster (3), the front end of the torsion adjuster (3) is adjustably positioned with the waist bag structure (6), the rear end of the torsion adjuster (3) is provided with the adjusting knob (4), the backrest body (7) and the waist bag structure (6) are connected with the torsion adjusting frame (9), the torsion adjusting frame (9) is provided with the torsion spring (8), the inside of the torsion adjuster (3) is installed with the limiting sheet (10), the threaded rod (11), the torsion spring pressing block (13), the adjusting thread (15), the torsion spring shaft seat (14) and the knob connector (12), the knob connector (12) is clamped between the adjusting knob (4), the torsion spring (8) is connected with the torsion spring shaft seat (14), the threaded rod (11) penetrates through the limiting sheet (10), the torsion spring pressing block (13) is positioned outside the threaded rod (11), the torsion spring shaft seat (14) is located at both ends of the torsion spring pressing block (13), and the inner side of the lifting support (5) is movably arranged on the position of the backrest support (1) and provided with the adjustable locking structure (16).

2. The adjustable lumbar and back structure for a swivel chair according to claim 1, wherein: When the adjusting knob (4) rotates, the knob connector (12) rotates synchronously, the knob connector (12) adjusts the torsion spring pressing block (13) through the adjusting thread (15) to increase or decrease the torsion spring pre-tightening force.

3. The adjustable lumbar and back structure for a swivel chair according to claim 1, wherein: The lifting support (5) moves up and down on the outer ring of the backrest support (1), and the lifting support (5) is positioned and clamped on the outer ring of the backrest support (1) through the adjustable locking structure (16), and the lifting support (5) drives the backrest body (7) to move up and down.

4. The adjustable lumbar and back structure for a swivel chair according to claim 1, wherein: The backrest body (7) and the lifting support (5) are integrally formed by injection molding, the waist bag structure (6) is adjusted in front of the lower end of the backrest body (7), and the adjusting knob (4) is adjusted and controlled.

5. The adjustable lumbar and back structure for a swivel chair according to claim 1, wherein: The adjusting knob (4) and the knob connector (12) adjust the pre-tightening force of the torsion spring (8), so that the position of the torsion adjusting frame (9) is adjusted by the torsion spring (8), and the waist bag structure (6) is adjusted in front of the backrest body (7).

6. The adjustable lumbar and back structure for a swivel chair according to claim 1, wherein: The limiting sheet (10) and the torsion adjuster (3) are fixed by bolts, and the limiting sheet (10) limits the position of the threaded rod (11).

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