Chair back structure capable of rotating along with sitting posture

Abstract

The chair back structure capable of rotating along with the sitting posture comprises a back support, a rotating support and a back frame, the back frame is arranged on the rotating support, the rotating support is located in a clamping groove of the back support, a rotating pull rod is arranged on the back support, and the rotating pull rod, the lower portion of the back frame and the lower portion of the rotating support are connected through a lower connecting rod. The middle chaining position of the rotating support is connected with the upper portion of the back support through an upper connecting rod, a spring piece is arranged between the rotating pull rod and the rotating support, one end of the spring piece is bent and attached to the rotating pull rod, and the other end of the spring piece is connected with the rotating support in an abutting mode after being provided with a spring pressing piece. According to the chair back structure provided by the utility model, the angle of the chair back is changed by utilizing the change of gravity, and the back can be better supported by the rotating chair back structure; the chair can rotate along with the sitting posture conveniently, and is simple in overall structure, reliable in function and convenient to assemble.

Description

Technical Field

[0001] This utility model relates to a chair back structure, and more particularly to a chair back structure that can rotate with the sitting posture. Background Technology

[0002] Chairs, as commonly used seating in daily life, work, and study, should possess the basic functions of comfort, convenience, and safety. However, the lumbar support of current office chair backs lacks forward and backward adjustment. Different body types have different lumbar positions and require different levels of support; consequently, the lumbar support is not adequately supported when the user rotates, affecting comfort and user experience. Therefore, it is necessary to provide a chair back structure that can rotate with the user's sitting posture. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a chair back structure that can rotate with the sitting posture, thereby solving the problem that the existing chair back structure cannot be adjusted to rotate with the sitting posture.

[0004] The technical solution adopted by this utility model to solve the above-mentioned technical problems is to provide a chair back structure that can rotate with the sitting posture, including a back support, a rotating support, and a back frame. The back frame is disposed on the rotating support, and the rotating support is located in the slot of the back support. A rotating pull rod is provided on the back support. The rotating pull rod, the lower part of the back frame, and the lower part of the rotating support are connected by a lower connecting rod. The middle connection position of the rotating support and the upper part of the back support are connected by an upper connecting rod. A spring plate is provided between the rotating pull rod and the rotating support. One end of the spring plate is bent and fits against the rotating pull rod, and the other end of the spring plate is provided with a spring pressure plate and abuts against the rotating support.

[0005] In the aforementioned chair back structure that can rotate with the sitting posture, the rotating bracket and the back bracket are locked together by round-headed self-tapping screws.

[0006] In the aforementioned chair back structure that can rotate with the sitting posture, the back frame and the rotating bracket are connected by stepped screws on both sides.

[0007] Compared with the prior art, the present invention has the following advantages: The chair back structure provided by the present invention changes the angle of the chair back by changing the gravity, and the rotating chair back structure can better support the back; it can not only easily rotate with the sitting posture, but also has a simple overall structure, reliable function, and is easy to assemble. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the chair back structure that can rotate with the sitting posture in an embodiment of this utility model.

[0009] The diagram is marked as follows:

[0010] 1. Back support; 2. Spring plate; 3. Rotating pull rod; 4. Spring pressure plate; 5. Round head self-tapping screw; 6. Rotating support; 7. Lower connecting rod; 8. Upper connecting rod; 9. Step screw; 10. M5×12 screw; 11. Back frame. Detailed Implementation

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0012] Figure 1 This is a schematic diagram of the chair back structure that can rotate with the sitting posture in an embodiment of this utility model.

[0013] Please see Figure 1 The chair back structure that can rotate with the sitting posture in this embodiment of the utility model includes a back support 1, a rotating support 6, and a back frame 11. The back frame 11 is disposed on the rotating support 6, and the rotating support 6 is located in the slot of the back support 1. A rotating pull rod 3 is disposed on the back support 1. The rotating pull rod 3, the lower part of the back frame 11, and the lower part of the rotating support 6 are connected by a lower connecting rod 7. The middle connection position of the rotating support 6 and the upper part of the back support 1 are connected by an upper connecting rod 8. A spring plate 2 is disposed between the rotating pull rod 3 and the rotating support 6. One end of the spring plate 2 is bent and fits against the rotating pull rod 3. The other end of the spring plate 2 is provided with a spring pressure plate 3 and abuts against the rotating support 6.

[0014] In the chair back structure of this utility model embodiment, the rotating bracket 6 and the back support 1 are locked together by round-head self-tapping screws 4; the back frame 11 and the two sides of the rotating bracket 6 are locked together by stepped screws 9.

[0015] The chair back structure of this embodiment is simple in structure and reliable in function. It can easily rotate with the sitting posture. The specific adjustment process is as follows: the lower part of the rotating rod 3 and the lower part of the rotating bracket 6 are connected by the lower connecting rod 7. Then, the upper part of the back bracket 1 and the middle part of the rotating bracket 6 are connected by the upper connecting rod 8, forming a simple chair back mechanism that rotates with the change of sitting posture. One end of the spring plate 2 is bent and fits against the lower half of the rotating rod 3. From the perspective of force balance, when the user is sitting and working, the weight exerted by the human body on the chair back is less than the elastic force of the spring itself. The back frame 11 and the seat cushion will form a small angle, and the lumbar support will also fit closely against the waist, providing support. When the user leans lightly against the chair back, the weight exerted by the human body on the chair back is less than or equal to the elastic force of the spring itself. At this time, the user is in a relatively static state. The lumbar support still fits closely against the waist, and the back bracket 1 will also support the back according to the change of sitting posture, relieving fatigue caused by prolonged office work. When you need to lie down to rest, your sitting posture is closer to the chair back. At this point, your body weight is greater than the spring force, causing the chair back angle to increase and approach horizontal. The lumbar support also rotates with the chair back, closely conforming to your back. There's no need to adjust the backrest angle through any special mechanism; it's very convenient to change the backrest angle using gravity as your sitting posture changes. Furthermore, the rotating backrest structure provides better support for your back.

[0016] The chair back structure of this utility model embodiment is easy to assemble. The specific assembly process is as follows: Place the rotating pull rod 3 on the back support 1; then place the spring plate 2; place the spring pressure plate 4 on the spring plate 2; lock the round head self-tapping screw 5; put the rotating bracket 6 into the slot of the back support 1, and place the back frame 11 in the designated position of the rotating bracket 6; first lock the step screw 9; switch to the other side and lock another step screw 9; finally install the lower connecting rod 7 and the upper connecting rod 8, switch to the other side and lock the M5×12 screw 10 to complete the assembly.

[0017] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications and improvements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. A chair back structure that can rotate with a sitting posture, characterized in that, The device includes a back support (1), a rotating support (6), and a back frame (11). The back frame (11) is mounted on the rotating support (6). The rotating support (6) is located in the slot of the back support (1). A rotating pull rod (3) is mounted on the back support (1). The lower part of the rotating pull rod (3), the lower part of the back frame (11), and the lower part of the rotating support (6) are connected by a lower connecting rod (7). The middle connection position of the rotating support (6) and the upper part of the back support (1) are connected by an upper connecting rod (8). A spring plate (2) is provided between the rotating pull rod (3) and the rotating support (6). One end of the spring plate (2) is bent and fits against the rotating pull rod (3). The other end of the spring plate (2) is provided with a spring pressure plate (4) and abuts against the rotating support (6).

2. The chair back structure that can rotate with the sitting posture as described in claim 1, characterized in that, The rotating bracket (6) and the back bracket (1) are locked together by round-head self-tapping screws (5).

3. The chair back structure that can rotate with the sitting posture as described in claim 1, characterized in that, The back frame (11) and the rotating bracket (6) are locked together on both sides by step screws (9).

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