Chair backrest support radian positioning device

Abstract

The utility model discloses a chair backrest support radian positioning device, and particularly relates to the technical field of chairs, the chair backrest support radian positioning device comprises a fixing frame, two supporting blocks are fixedly arranged in the fixing frame, rotating rods are rotatably arranged at the tops of the two supporting blocks, a protruding block is rotatably arranged at one end of each rotating rod, and a positioning mechanism is arranged outside each protruding block. The positioning mechanism comprises a backrest support fixedly arranged outside the rotating rod, a rotating handle is fixedly arranged on one side of the rotating rod, a mounting groove is formed in the rotating handle, a spring is fixedly arranged in the mounting groove, a guide block is fixedly arranged at one end of the spring and slidably connected with the mounting groove, and a sliding strip is fixedly arranged at the top of the guide block. Accurate positioning and firm locking of the radian of the backrest support are achieved, stability during use is guaranteed, the radian of the backrest is flexibly adjusted, the backrest support can better fit the curve of the back of a human body, and more comfortable supporting is provided.

Description

Technical Field

[0001] This utility model relates to the field of chair technology, and more specifically, to a chair back support arc positioning device. Background Technology

[0002] Backrest chairs are common items in daily life. Traditional backrest chairs, due to the fixed angle formed by the seat and backrest, provide poor lumbar support for the person sitting in the chair. Moreover, since different people have different lumbar flexion heights, the backrest cannot provide good lumbar support, resulting in poor comfort.

[0003] Existing adjustable backrest chairs mainly only adjust the headrest and the tilt of the entire backrest. When a person sits upright in the chair, the backrest does not contact the lower back, and there is no stable support between the lower back and the backrest. Prolonged sitting may cause diseases such as lumbar disc herniation.

[0004] A search revealed that Chinese patent CN210842308U discloses an adjustable backrest chair. In this structure, when a person sits on the chair panel, the backrest is an arc-shaped structure protruding towards the chair panel, providing arch support for the lumbar region. To adjust the backrest's curvature, a handwheel is rotated, driving a worm gear. The worm gear drives a worm wheel, which is connected to a ball screw, causing the ball screw to rotate. This rotation moves the screw nut vertically upwards or downwards. The screw nut, via a pull cord, pulls the top of the backrest, increasing or decreasing its curvature. Moving the screw nut downwards increases the curvature, while moving it upwards decreases it. Adjustments can be made at any time by changing the direction of the handwheel's rotation. The worm gear and worm wheel work together to form a self-locking mechanism, preventing the screw nut from moving under the elastic force of the backrest when the handwheel is not turned. The arc-shaped structure of the backrest provides effective and stable support for the lumbar region.

[0005] However, in actual use, this structure only adjusts the curvature of the chair back by rotating a handwheel to drive a series of transmission components. There are no clear angle or curvature indicators, making it difficult for users to accurately control the adjustment of the chair back to their comfortable curvature position. They may need to make repeated adjustments to find the right support angle, which affects the user experience. Utility Model Content

[0006] In order to overcome the above-mentioned defects of the prior art, the present invention provides a chair back support arc positioning device to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A chair back support arc positioning device includes a fixed frame, inside which two support blocks are fixedly installed. A rotating rod is rotatably installed on the top of each of the two support blocks. A protruding block is rotatably installed at one end of each rotating rod. A positioning mechanism is installed on the outside of each protruding block.

[0009] The positioning mechanism includes a backrest bracket fixedly mounted on the outside of the rotating rod. A rotating handle is fixedly mounted on one side of the rotating rod. An installation groove is opened inside the rotating handle. A spring is fixedly mounted inside the installation groove. A guide block is fixedly mounted on one end of the spring. The guide block is slidably connected to the installation groove. A slide bar is fixedly mounted on the top of the guide block. A sliding groove is opened on the surface of the rotating handle. The slide bar is slidably connected to the sliding groove. A fixing block is fixedly mounted on the top of the slide bar.

[0010] By adopting the above technical solution, the curvature of the backrest bracket can be accurately positioned and firmly locked, ensuring stability during use and easily meeting the user's needs for adjusting the backrest angle.

[0011] As a further description of the above technical solution: a positioning rod is fixedly provided on one side of the guide block, a limiting block is fixedly provided on one side of the slide bar, a first limiting ring is fixedly provided on the top of one of the support blocks, a fixing ring is provided on one side of the first limiting ring, a positioning groove is provided inside the fixing ring, a second limiting ring is slidably provided inside the positioning groove, a plurality of positioning holes are provided on the surface of the second limiting ring, and the positioning rod is inserted into the positioning holes.

[0012] By adopting the above technical solution: the positioning rod is inserted into the positioning hole, and with the cooperation of multiple positioning holes, the curvature of the backrest bracket can be accurately locked to meet the diverse needs of different users for the backrest angle. The addition of a limit block prevents the slider from sliding excessively, ensuring structural stability and smooth rotation of the rotating rod during the adjustment process.

[0013] As a further description of the above technical solution: the surface of the backrest support is provided with an auxiliary mechanism, the auxiliary mechanism including two fixing grooves formed on the surface of the backrest support, a T-shaped fixing block is slidably arranged inside the two fixing grooves, a backrest is fixedly arranged on one side of the T-shaped fixing block, a force-bearing block is embedded inside the backrest, a screw is rotatably arranged inside the backrest support, one end of the screw is rotatably connected to the force-bearing block, and a handle is fixedly arranged on the other end of the screw.

[0014] By adopting the above technical solution, the user rotates the handle to drive the screw, which in turn drives the backrest to slide along the T-shaped fixing block and the fixing groove through the force block. This allows for fine adjustment of the relative position of the backrest and the backrest support, meeting the needs of different body types and usage habits. The backrest curvature can be flexibly adjusted to better fit the curve of the human back, providing more comfortable support and reducing back fatigue.

[0015] The technical effects and advantages of this utility model are as follows:

[0016] By incorporating a positioning mechanism, compared to existing technologies, the backrest support curvature can be easily adjusted by simply pulling the positioning rod backward to release the lock, followed by rotating the handle. This simple operation allows users to quickly adjust as needed. Furthermore, the spring-driven positioning rod inserts into the positioning hole of the second limiting ring for precise positioning, accurately fixing the backrest support at the desired curvature and providing stable support. The second limiting ring slides within the positioning groove of the fixed ring, limiting the rotation of the rotating rod and ensuring a smooth adjustment process. The sliding bar and groove work together, with a limiting block preventing excessive sliding, further enhancing stability and effectively achieving backrest support curvature adjustment and positioning, thus improving the chair's comfort and adaptability.

[0017] By incorporating an auxiliary mechanism, this technology can meet personalized needs compared to existing technologies. Users can fine-tune the relative position of the backrest and backrest support by rotating the handle according to their body type and usage habits. The operation is simple; just rotate the handle, and the screw and the force-bearing block will move the backrest along the direction of the T-shaped fixing block and the fixing groove, improving comfort. The fine-tuning of the backrest can optimize the support effect, better conform to the curve of the human body, reduce back pressure, and provide a comfortable sitting experience for different users, enhancing the overall adaptability and practicality of the chair. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0019] Figure 2 This is a schematic diagram of the overall front view of the present invention.

[0020] Figure 3 This is a cross-sectional structural diagram of the positioning mechanism of this utility model.

[0021] Figure 4 This is a schematic diagram showing the detailed structure of the positioning mechanism of this utility model.

[0022] Figure 5 This is a schematic diagram of the auxiliary mechanism structure of this utility model.

[0023] The attached diagram is labeled as follows: 1. Fixed frame; 2. Support block; 3. Rotating rod; 4. Protruding block; 5. Backrest bracket; 6. Rotating handle; 7. Spring; 8. Guide block; 9. Slide bar; 10. Fixed block; 11. Positioning rod; 12. Limiting block; 13. First limiting ring; 14. Fixed ring; 15. Second limiting ring; 16. Positioning hole; 17. Fixed groove; 18. T-shaped fixing block; 19. Backrest; 20. Force-bearing block; 21. Screw; 22. Handle. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] The embodiments disclosed in this application are as follows: Figure 1-5 The chair back support arc positioning device shown includes a fixed frame 1. Two support blocks 2 are fixedly installed inside the fixed frame 1. A rotating rod 3 is rotatably installed on the top of each of the two support blocks 2. A protruding block 4 is rotatably installed at one end of the rotating rod 3. A positioning mechanism is installed on the outside of the protruding block 4.

[0026] The positioning mechanism includes a backrest bracket 5 fixedly mounted on the outside of the rotating rod 3. A rotating handle 6 is fixedly mounted on one side of the rotating rod 3. An installation groove is opened inside the rotating handle 6. A spring 7 is fixedly mounted inside the installation groove. A guide block 8 is fixedly mounted on one end of the spring 7. The guide block 8 is slidably connected to the installation groove. A slide bar 9 is fixedly mounted on the top of the guide block 8. A sliding groove is opened on the surface of the rotating handle 6. The slide bar 9 is slidably connected to the sliding groove. A fixing block 10 is fixedly mounted on the top of the slide bar 9. When the positioning rod 11 is pulled backward, the positioning rod 11 drives the guide block 8 to slide in the installation groove. At the same time, it drives the slide bar 9 to slide in the sliding groove, ensuring the stable movement of the guide block 8. It also compresses the spring 7 to contract, thereby driving the positioning rod 11 to contract into the installation groove, so that the positioning rod 11 is withdrawn from the positioning hole 16.

[0027] Next, rotate the handle 6. Rotating the handle 6 will drive the rotating rod 3 to rotate. The rotating rod 3 will drive the second limiting ring 15 to rotate, so that the second limiting ring 15 slides in the positioning groove inside the fixed ring 14, which has a limiting effect and ensures that the rotating rod 3 rotates smoothly. Then, when it rotates to the appropriate position.

[0028] Reference Figure 2-4As shown, a positioning rod 11 is fixedly installed on one side of the guide block 8, and a limiting block 12 is fixedly installed on one side of the slide bar 9. A first limiting ring 13 is fixedly installed on the top of one of the support blocks 2. A fixing ring 14 is installed on one side of the first limiting ring 13. A positioning groove is opened inside the fixing ring 14. A second limiting ring 15 is slidably installed inside the positioning groove. A plurality of positioning holes 16 are opened on the surface of the second limiting ring 15. The positioning rod 11 is inserted into the positioning hole 16. When the positioning rod 11 is released, under the elastic force of the spring 7, the spring 7 pushes the guide block 8 along the mounting groove away from the spring 7. The guide block 8 drives the positioning rod 11 to extend out of the mounting groove. The positioning rod 11 is inserted into the positioning hole 16 at the corresponding position on the surface of the second limiting ring 15, thereby locking the second limiting ring 15 and the connected rotating rod 3 and backrest bracket 5 in the current position, completing the adjustment and positioning of the curvature of the backrest bracket. In addition, a limiting block 12 is fixedly installed on one side of the slide bar 9 to prevent the slide bar 9 from sliding excessively.

[0029] Reference Figure 5 As shown, the surface of the backrest support 5 is provided with an auxiliary mechanism, which includes two fixing grooves 17 formed on the surface of the backrest support 5. T-shaped fixing blocks 18 are slidably disposed inside each of the two fixing grooves 17. A backrest 19 is fixedly disposed on one side of each T-shaped fixing block 18. A force-bearing block 20 is embedded inside the backrest 19. A screw 21 is rotatably disposed inside the backrest support 5. One end of the screw 21 is rotatably connected to the force-bearing block 20, and a handle 22 is fixedly disposed on the other end of the screw 21. After the curvature of the backrest support 5 is adjusted, if further adjustment of the backrest 19 and the backrest support is required... The relative position of 5 can be achieved by operating the auxiliary mechanism. Rotating the handle 22 causes the screw 21 to rotate inside the backrest bracket 5. Since the screw 21 is rotatably connected to the force-bearing block 20 and the force-bearing block 20 is embedded inside the backrest 19, the rotation of the screw 21 will cause the force-bearing block 20 to move along the direction of the T-shaped fixing block 18 and the fixing groove 17 through the threaded engagement. The T-shaped fixing block 18 slides in the fixing groove 17, allowing the backrest 19 to be finely adjusted on the surface of the backrest bracket 5 to adapt to different user body shapes and usage needs, providing more comfortable support.

[0030] Working principle of this utility model:

[0031] This utility model is a chair back support arc positioning device. When the arc of the back support needs to be adjusted, the positioning rod 11 is pulled back. The positioning rod 11 drives the guide block 8 to slide in the mounting groove, and at the same time drives the slide strip 9 to slide in the groove, ensuring the stable movement of the guide block 8. The compression spring 7 is compressed, which in turn drives the positioning rod 11 to retract into the mounting groove, so that the positioning rod 11 is withdrawn from the positioning hole 16.

[0032] Next, rotate the handle 6. Rotating the handle 6 drives the rotating rod 3 to rotate, and the rotating rod 3 drives the second limiting ring 15 to rotate, so that the second limiting ring 15 slides in the positioning groove inside the fixed ring 14, which has a limiting effect and ensures that the rotating rod 3 rotates smoothly. Then, when it is rotated to the appropriate position, release the positioning rod 11. Under the elastic force of the spring 7, the spring 7 pushes the guide block 8 along the mounting groove away from the spring 7. The guide block 8 drives the positioning rod 11 to extend out of the mounting groove. The positioning rod 11 is inserted into the positioning hole 16 at the corresponding position on the surface of the second limiting ring 15, thereby locking the second limiting ring 15, the rotating rod 3 connected to it, and the backrest bracket 5 in the current position, completing the adjustment and positioning of the curvature of the backrest bracket. In addition, a limiting block 12 is fixedly set on one side of the slide bar 9 to prevent the slide bar 9 from sliding excessively.

[0033] After the curvature of the backrest bracket 5 is adjusted, if further adjustment of the relative position between the backrest 19 and the backrest bracket 5 is required, it can be achieved by operating the auxiliary mechanism. Rotate the handle 22, which drives the screw 21 to rotate inside the backrest bracket 5. Because the screw 21 is rotatably connected to the force-bearing block 20, and the force-bearing block 20 is embedded inside the backrest 19, the rotation of the screw 21 will cause the force-bearing block 20 to move the backrest 19 along the mating direction of the T-shaped fixing block 18 and the fixing groove 17 through the threaded engagement. The T-shaped fixing block 18 slides in the fixing groove 17, allowing the backrest 19 to be finely adjusted on the surface of the backrest bracket 5 to adapt to different user body shapes and usage needs, providing more comfortable support.

[0034] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A chair back support arc positioning device, comprising a fixing frame (1), characterized in that: The fixed frame (1) has two support blocks (2) fixedly installed inside. The top of each support block (2) is rotatably equipped with a rotating rod (3). One end of the rotating rod (3) is rotatably equipped with a protruding block (4). The protruding block (4) is equipped with a positioning mechanism on its outside. The positioning mechanism includes a backrest bracket (5) fixedly installed outside the rotating rod (3). A rotating handle (6) is fixedly installed on one side of the rotating rod (3). An installation groove is opened inside the rotating handle (6). A spring (7) is fixedly installed inside the installation groove. A guide block (8) is fixedly installed at one end of the spring (7). The guide block (8) is slidably connected to the installation groove. A slide bar (9) is fixedly installed on the top of the guide block (8). A sliding groove is opened on the surface of the rotating handle (6). The slide bar (9) is slidably connected to the sliding groove. A fixing block (10) is fixedly installed on the top of the slide bar (9).

2. The chair back support arc positioning device according to claim 1, characterized in that: A positioning rod (11) is fixedly provided on one side of the guide block (8), a limiting block (12) is fixedly provided on one side of the slide bar (9), and a first limiting ring (13) is fixedly provided on the top of one of the support blocks (2).

3. The chair back support arc positioning device according to claim 2, characterized in that: A fixing ring (14) is provided on one side of the first limiting ring (13). A positioning groove is provided inside the fixing ring (14). A second limiting ring (15) is slidably provided inside the positioning groove. A plurality of positioning holes (16) are provided on the surface of the second limiting ring (15). The positioning rod (11) is inserted into the positioning hole (16).

4. The chair back support arc positioning device according to claim 1, characterized in that: The backrest support (5) is provided with an auxiliary mechanism, which includes two fixing grooves (17) opened on the surface of the backrest support (5). T-shaped fixing blocks (18) are slidably arranged inside the two fixing grooves (17), and a backrest (19) is fixedly arranged on one side of the T-shaped fixing block (18).

5. The chair back support arc positioning device according to claim 4, characterized in that: The backrest (19) is internally fitted with a force-bearing block (20), and the backrest bracket (5) is internally fitted with a screw (21) for rotation.

6. The chair back support arc positioning device according to claim 5, characterized in that: One end of the screw (21) is rotatably connected to the force-bearing block (20), and the other end of the screw (21) is fixedly provided with a handle (22).

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