Adjustable waist rest structure

Abstract

The utility model relates to the technical field of seats, in particular to an adjustable waist rest structure which comprises a chair back and a backrest, the chair back is provided with a containing groove, one end of the backrest is rotationally connected into the containing groove, and a plurality of arc-shaped blocks are arranged at the rotating end of the backrest in the circumferential direction; the chair back is provided with clamping jaws used for being embedded between the adjacent arc-shaped blocks so as to limit the rotating angle of the backrest, and the chair back is provided with abutting springs used for driving the clamping jaws to keep the embedding tendency. Compared with the prior art, the chair has the following effects that when the chair is used, the chair is adjusted to a proper angle by rotating the backrest, in the adjusting process, the clamping jaws can be embedded between the arc-shaped blocks, and under the abutting state of the clamping jaws, the backrest cannot continue to rotate, one-way locking is achieved, adjustment can be conducted from the other direction, so that the position of the backrest is adjusted, and comfort is improved.

Description

Technical Field

[0001] The present application relates to the technical field of seats, and particularly to an adjustable lumbar support structure. Background Art

[0002] With the development of modern life, products such as seats are no longer limited to meeting the needs of users to sit, and some additional functions are increasing day by day. At present, in office seats or seats for long-term use, in order to improve the comfort of the back support of the seat, a corresponding backrest will be provided at the backrest to provide better support.

[0003] Generally, a seat may also be used by multiple users respectively. The backrest often has only a fixed installation position when leaving the factory. For different users, the position of the backrest may not be appropriate. An inappropriate backrest will not only provide better support, but will instead cause discomfort. Utility Model Content

[0004] In order to facilitate the adjustment of the rotation angle of the backrest, the present application provides an adjustable lumbar support structure.

[0005] An adjustable lumbar support structure provided by the present application adopts the following technical solution: An adjustable lumbar support structure includes a backrest and a backrest. The backrest has a receiving groove. One end of the backrest is rotatably connected to the receiving groove. A plurality of arc-shaped blocks are circumferentially arranged along the rotation end of the backrest. A claw is provided on the backrest for being embedded between adjacent arc-shaped blocks to limit the rotation angle of the backrest. A resisting spring is provided on the backrest for driving the claw to maintain an embedding tendency.

[0006] By adopting the above technical solution, during use, by rotating the backrest to adjust to a suitable angle, during the adjustment process, the claw will be embedded between the arc-shaped blocks. In the tightened state of the claw, the backrest cannot continue to rotate, realizing one-way locking, and can be adjusted from the other direction, thereby adjusting the position of the backrest and improving comfort.

[0007] Preferably, the backrest has a rotating shaft, and both ends of the rotating shaft are rotatably connected to the inner wall of the receiving groove.

[0008] Preferably, the claw is movably arranged along the axial direction of the rotating shaft, and a return spring for abutting against the end of the claw is arranged on the inner wall of the receiving groove.

[0009] Preferably, a rotating wheel is provided on the rotating shaft, and the claw is arranged on the outer wall of the rotating wheel.

[0010] Preferably, a clamping post for positioning the clamping position of the rotating wheel is provided on the inner wall of the receiving groove.

[0011] Preferably, one side of the rotating wheel close to the inner wall of the accommodating groove has a sliding groove perpendicular to the surface of the rotating wheel. An engaging post is elastically arranged in the sliding groove, and the end of the engaging post is semi-spherical. A plurality of engaging grooves are arranged on the inner wall of the accommodating groove along the circumferential direction.

[0012] In summary, the present application includes at least one of the following beneficial technical effects: When in use, by rotating the backrest to adjust it to a suitable angle, during the adjustment process, the claw will be embedded between the arc-shaped blocks. In the tightened state of the claw, the backrest cannot continue to rotate, realizing one-way locking, and can be adjusted in the other direction, thereby adjusting the position of the backrest and improving comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of the present application;

[0014] Figure 2 is a schematic partial structural diagram of the present application;

[0015] Figure 3 is a schematic connection relationship diagram of the rotating wheel and the claw;

[0016] Figure 4 is a partial cross-sectional view of the present application.

[0017] Description of the reference numerals: 100, chair back; 110, backrest; 111, accommodating groove; 112, rotating shaft; 113, rotating wheel; 114, claw; 115, arc-shaped block; 116, limiting block; 117, abutting spring; 120, driving rod; 121, return spring; 130, engaging post; 131, engaging spring; 132, engaging groove; 133, sliding groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The present application will be further described in detail below with reference to the accompanying drawings.

[0019] An adjustable lumbar support structure, referring to Figure 1 , includes a chair back 100, and a backrest 110 is rotatably arranged on the chair back 100. In this embodiment, there is an accommodating groove 111 at a position slightly below the middle of the chair back 100 for the backrest 110 to be adjusted inside.

[0020] Referring to Figure 2 , Figure 3 , the backrest 110 is provided with a rotating shaft 112, and a rotating wheel 113 is arranged on the rotating shaft 112. A plurality of arc-shaped blocks 115 are arranged on the outer wall of the rotating wheel 113 along the circumferential direction. The two ends of the rotating shaft 112 are rotatably connected to the inner wall of the accommodating groove 111. When the backrest 110 rotates, the rotating wheel 113 will rotate synchronously.

[0021] A claw 114 is provided on the chair back 100, one end of which is rotatably connected to the inner wall of the accommodating groove 111, and a resistance spring 117 is provided on the chair back 100, one end of which is fixedly connected to the claw 114, so that the claw 114 has a tendency to be embedded between two adjacent arc blocks 115, and the claw 114 is also an adaptive arc. When the rotating wheel 113 rotates from one direction, the arc block 115 will resist on the claw 114, so that the claw 114 rotates, and the resistance spring 117 will cause the claw 114 to be embedded between the next arc blocks 115, and when the rotating wheel 113 rotates from the other direction, a limit block 116 is provided on the chair back 100 and on the side of the claw 114 away from the resistance spring 117, and the claw 114 will resist on the limit block 116, so as not to rotate in the opposite direction. The single-direction adjustment is realized so that the angle of the backrest 110 can be adjusted.

[0022] The claw 114 is connected to a driving rod 120, and the driving rod 120 is slidably connected to the chair back 100, so that the claw 114 can be separated from between the two arc blocks 115. A return spring 121 is also arranged in the accommodating groove 111 for abutting against the end of the claw 114. When not acting on the driving rod 120, the return spring 121 can keep the claw 114 in the arc block 115. At the same time, in order to position the claw 114 during the sliding process, the length of the limit block 116 in this embodiment can maintain the abutment against the claw 114 during the sliding process.

[0023] Reference Figure 3 , Figure 4 The inner wall of the receiving groove 111 has a clamping column 130 for locating the clamping position of the rotating wheel 113. The rotating wheel 113 can maintain the same angle every time it rotates, and it is also convenient for the claw 114 to be accurately clamped between the two arc blocks 115 when resetting.

[0024] Specifically, the rotating wheel 113 has a sliding groove 133 perpendicular to the surface of the rotating wheel 113 on one side of the inner wall of the receiving groove 111, and a clamping column 130 is elastically arranged in the sliding groove 133. A clamping spring 131 is arranged in the sliding groove 133, and the end of the clamping spring 131 is connected to the clamping column 130. At the same time, the end of the clamping column 130 is semi-spherical, and a plurality of clamping grooves 132 are arranged circumferentially on the inner wall of the receiving groove 111. During the rotation process, the clamping column 130 will be continuously embedded in the clamping groove 132, so that the position of each rotation stop can be determined, which is convenient for the claw 114 to reset.

[0025] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An adjustable lumbar support structure, comprising a chair back (100) and a backrest (110), characterized in that: The backrest (100) has a receiving groove (111), one end of the backrest (110) is rotatably connected within the receiving groove (111), a plurality of arc-shaped blocks (115) are circumferentially arranged along the rotating end of the backrest (110), and a claw (114) for being embedded between adjacent arc-shaped blocks (115) is arranged on the backrest (100) to limit the rotation angle of the backrest (110), and a resisting spring (117) for driving the claw (114) to maintain an embedding tendency is arranged on the backrest (100).

2. The adjustable lumbar support structure according to claim 1, wherein: The backrest (110) has a rotating shaft (112), and both ends of the rotating shaft (112) are rotatably connected to the inner wall of the receiving groove (111).

3. The adjustable lumbar support structure according to claim 2, wherein: The claw (114) is movably arranged along the axial direction of the rotating shaft (112), and a return spring (121) for abutting against the end of the claw (114) is arranged on the inner wall of the receiving groove (111).

4. The adjustable lumbar support structure according to claim 3, characterized in that: A rotating wheel (113) is provided on the rotating shaft (112), and the claw (114) is arranged on the outer wall of the rotating wheel (113).

5. The adjustable lumbar support structure according to claim 4, characterized in that: A clamping post (130) for positioning the clamping position of the rotating wheel (113) is provided on the inner wall of the receiving groove (111).

6. The adjustable lumbar support structure according to claim 5, characterized in that: One side of the rotating wheel (113) close to the inner wall of the receiving groove (111) has a sliding groove (133) perpendicular to the surface of the rotating wheel (113), a clamping post (130) is elastically arranged in the sliding groove (133), the end of the clamping post (130) is semi-spherical, and a plurality of clamping grooves (132) are circumferentially arranged on the inner wall of the receiving groove (111).

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