Waist support stretching device suitable for seat

Abstract

The utility model relates to the field of seat design and manufacturing, in particular to a waist support stretching device suitable for a seat. According to the technical scheme, the waist support stretching device suitable for the seat comprises a back frame and further comprises a pneumatic assembly installed on the back frame and an unfolding frame connected with the pneumatic assembly, and the unfolding frame stretches and retracts in the horizontal front-back direction under movement of the pneumatic assembly. The unfolding frame is connected with an abutting frame, and the abutting frame is driven by the pneumatic assembly to provide stable and uniform supporting force for the waist and the back of the human body. The utility model aims to overcome the defects in the prior art, and provides the waist support stretching device suitable for the seat, the waist support and the seat. When a user moves back and forth on the seat, the waist support can make synchronous movement by clinging to the waist and back of the human body to fit the waist in real time, so that the supporting force to the waist of the human body is increased.

Description

Technical Field

[0001] The utility model relates to the field of seat design and manufacturing, in particular to a lumbar support stretching device suitable for a seat. Background Art

[0002] Chairs are a type of furniture that is widely used in daily life and work. They usually include a base, backrest, support structure, armrests and other parts. In order to meet people's personalized needs and bring a more comfortable and healthy use experience, the structure and function of the chair are constantly improving. When users use chairs, they often rely on the base and backrest to support their hips and back, while the support of the waist is relatively weak. The muscles and spine of the waist and back of the human body will bear the pressure of the upper body weight. In the long run, lumbar muscle strain and spinal lesions will occur, causing inconvenience to people in learning, life and work.

[0003] In recent years, in order to provide support for the waist, chairs with lumbar supports have appeared on the market. The lumbar support is connected to the base or backrest to provide good support for the user's waist, so that the user sits upright and has a good protective function for the lumbar spine. However, the existing lumbar support chairs have the defect that the lumbar support does not fit the human body tightly. That is, when the user's sitting posture is adjusted, such as leaning forward, the lumbar support often cannot be adjusted and retracted with the movement of the human body, and cannot continue to effectively fit the human body to support the waist, and the use effect of the lumbar support is relatively unsatisfactory.

[0004] In order to allow the lumbar support to support the waist and back of the human body at all times, people use elastic parts to act on the lumbar support so that the lumbar support can have elasticity and displacement. However, this technical solution has two defects: on the one hand, many elastic parts use components such as springs to provide elastic force. However, due to the influence of Hooke's law, the elastic force of the spring cannot achieve continuous and stable elastic force, and the elastic force of the spring changes with the movement of the position. On the other hand, the movement direction of the lumbar support in the prior art is often rotation, such as rotation in the horizontal direction, while the movement direction of the human body is not rotation, so there is a situation where the movement trajectory of the lumbar support and the movement trajectory of the human body are not highly consistent. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a lumbar support extension device suitable for a seat. When the user moves forward and backward on the seat, the lumbar support can move synchronously with the waist and back of the human body, fit the waist in real time, increase the support force on the waist position of the human body, and the movement trajectory of the lumbar support during the whole process is also forward and backward movement, which is highly consistent with the movement trajectory of the human body.

[0006] The above technical objectives of the utility model are achieved through the following technical solutions:

[0007] A lumbar support extension device suitable for a seat comprises a back frame, a pneumatic assembly installed on the back frame, and an expansion frame connected to the pneumatic assembly. The expansion frame telescopes in a horizontal front-to-rear direction under the movement of the pneumatic assembly. A resistance frame is connected to the expansion frame. The resistance frame provides stable and uniform support force for the waist and back of a human body under the drive of the pneumatic assembly.

[0008] As a preferred embodiment of the utility model, a transmission shaft is connected to the pneumatic component, the unfolding frame includes an unfolding frame 1, the unfolding frame 1 includes a long board 1 and a short board 1, the two ends of the long board 1 are respectively connected to the transmission shaft and the resistance frame, and the two ends of the short board 1 are respectively connected to the long board 1 and the back frame.

[0009] As a preferred embodiment of the present invention, the unfolding frame includes unfolding frame 2, and the unfolding frame 2 includes long board 2 and short board 2, two ends of the long board 2 are respectively connected to the back frame and the resistance frame, and two ends of the short board 2 are respectively connected to the long board 2 and the back frame.

[0010] As a preferred embodiment of the utility model, the interference frame is provided with a limiting groove 1 extending in the vertical direction, the back frame is provided with a limiting groove 2 extending in the vertical direction, and the long board 1 and the long board 2 slide in the limiting groove 1 and the limiting groove 2 respectively.

[0011] As a preferred embodiment of the utility model, the pneumatic assembly comprises a cylinder and a piston rod, wherein the cylinder is mounted on the back frame, and the piston rod is connected to the transmission shaft.

[0012] As a preferred embodiment of the present invention, it further comprises an auxiliary spring, one end of the auxiliary spring is connected to the back frame, and the other end is connected to the transmission shaft.

[0013] As a preferred embodiment of the present invention, the auxiliary spring and the piston rod both extend in the vertical direction, the auxiliary spring is located on one side of the transmission shaft in the vertical direction, and the piston rod is located on the other side of the transmission shaft in the vertical direction.

[0014] As a preferred embodiment of the present invention, the piston rod is provided with a switch for controlling the operation and shutdown of the pneumatic component, and also includes an operating device for operating and controlling the switch.

[0015] As a preferred embodiment of the utility model, the piston rod is provided with a coupling connected to the transmission shaft, the operating device includes a pull rope, a rope hook and a pressure plate rotatably connected to the coupling, the pull rope is connected to the rope hook, and the pressure plate is used to contact the switch.

[0016] As a preferred embodiment of the present invention, the rope hook, the piston rod and the cylinder are arranged in sequence in vertical height from high to low.

[0017] As a preferred embodiment of the present invention, the rope hook is provided with a wire passing groove for the pull rope to pass through.

[0018] A lumbar support comprises a lumbar support body and the lumbar support stretching device, wherein the lumbar support body is connected to the abutment frame.

[0019] A chair comprises chair legs, a chair frame, a stool connected to the chair frame, and a waist support, wherein the chair frame is connected to the back frame.

[0020] In summary, the utility model has the following beneficial effects:

[0021] 1. The telescopic elastic power comes from the pneumatic components. The pneumatic drive method is different from the spring. It is not affected by Hooke's law. The support and elastic force it provides are continuous and stable.

[0022] 2. The resistance effect on the human body comes from the extension and retraction of the unfolding frame, and the movement of the unfolding frame is the extension and retraction effect in the horizontal front and rear direction. This makes the resistance effect on the human body consistent with the movement effect when the user uses the seat, and the human body is more comfortable.

[0023] 3. The state switching of the pneumatic components is achieved through the operating device.

[0024] 4. The pneumatic components are at the bottom and the pressure plate is at the top, so that the entire pull rope can be routed from top to bottom, which is smoother.

[0025] 5. The auxiliary spring assists the pneumatic assembly to facilitate the smoothness of the lumbar support's forward movement during the starting phase.

[0026] 6. The entire resistance frame can move in the horizontal front-to-back direction by extending and retracting the two unfolding frames. Due to the opposite arrangement of the sliding ends and the hinged ends of the two unfolding frames, the height position of the resistance frame is stable during the extension and retraction of the two unfolding frames without shaking up and down. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of embodiment 1;

[0028] Figure 2 yes Figure 1 A magnified detail of point A in the figure.

[0029] In the figure: 1. back frame, 11. limit slot 2, 12. cylinder seat, 2. pneumatic component, 21. cylinder, 22. piston rod, 23. switch, 24. coupling, 241. rope fixing mouth, 3. unfolding frame 1, 31. long board 1, 32. short board 1, 4. auxiliary spring, 5. transmission shaft, 6. operating device, 61. rope hook, 611. wire passing middle slot, 62. pressure plate, 7. unfolding frame 2, 71. long board 2, 72. short board 2, 8. resistance frame, 81. limit slot 1. DETAILED DESCRIPTION

[0030] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0031] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

[0032] Embodiment 1, as Figure 1 and Figure 2 As shown, a lumbar support extension device suitable for a seat includes a back frame 1, which can be a rectangular frame extending in the vertical direction and can be regarded as a fixed part. An unfolding frame is installed on the back frame 1, and a resistance frame 8 is also installed on the unfolding frame. The resistance frame 8 is a component that resists and pushes the waist and back of the human body. The power component comes from the pneumatic component 2 installed on the back frame 1. In this case, the pneumatic component 2 provides power for the entire unfolding frame to extend and retract in the horizontal front and back direction, with the front being close to the waist and back of the human body and the back being far away from the waist and back of the human body.

[0033] The number of the expansion racks can be adjusted comprehensively according to the size of the product and the budget configuration, and can be single, or 2, 3, or 4. In this embodiment, a double rack setting is adopted, that is, the expansion rack includes an expansion rack 1 3 and an expansion rack 2 7.

[0034] Therefore, in this case, on the one hand, the telescopic elastic power comes from the pneumatic component 2, and the pneumatic driving method is different from the spring. It is not affected by Hooke's law, and the support force and elastic force it provides are continuous and stable. On the other hand, the resistance effect on the human body comes from the telescopic effect of the unfolding frame, and the movement of the unfolding frame is not rotation, but the telescopic effect in the horizontal front and back direction. The same is true for the movement effect of the user leaning forward and backward when using the seat, which makes the resistance effect on the human body consistent with the movement effect when the user uses the seat, and the human body is more comfortable.

[0035] Specifically, Figure 1 and Figure 2As shown, the back frame 1 includes a horizontally extending cylinder seat 12, on which a cylinder 21 is fixedly mounted. The cylinder 21 is connected to a piston rod 22, which moves in the vertical direction. The piston rod 22 is connected to a transmission shaft 5, and the transmission shaft 5 also moves in the vertical direction under the drive of the piston rod 22.

[0036] The unfolding frame 3 includes a long board 31 and a short board 32, wherein one end of the long board 31 is hinged to the transmission shaft 5, and the other end is slidably connected to a limit groove 81 on the abutment frame 8, and the limit groove 81 extends in the vertical direction. One end of the short board 32 is hinged to the back frame 1, and the other end is hinged to the long board 31, and the position can be the midpoint of the long board 31.

[0037] The structure of the second unfolding frame 7 is similar to that of the first unfolding frame 3, and includes a second long board 71 and a second short board 72. The difference between the second unfolding frame 7 and the first unfolding frame 3 is that the second long board 71 is not connected to the transmission shaft 5, and the hinged end and the sliding end of the long board are arranged oppositely. Specifically, in the second unfolding frame 7, the hinged end of the second long board 71 is hinged to the abutment frame, and the sliding end slides in the second limit groove 11 on the back frame 1.

[0038] The entire interference frame 8 moves in the horizontal front-to-back direction by extending and retracting the two unfolding frames, and due to the opposite settings of the sliding ends and the hinged ends of the two unfolding frames, the height position of the interference frame 8 is constant during the extension and retraction of the two unfolding frames and will not shake up and down.

[0039] The entire pneumatic assembly 2 can be in two states, namely, an open state and a closed state. In the former, the pneumatic assembly 2 can work, thereby driving the X-frame 3 to move, so that the entire waist support is in a state of free forward and backward movement. In the latter, the pneumatic assembly 2 is closed and locked, and cannot drive the unfolding frame to move. At this time, the position of the entire waist support is in a locked state and cannot move forward and backward.

[0040] The switching between the two states of the pneumatic component 2 is achieved by the operating device 6. Specifically, Figure 2 As shown, the coupling 24 is connected to the piston rod 22 and the transmission shaft 5. The pressure plate 62 is hinged to the coupling 24, and the rope hook 61 is connected to the pull rope, which is not shown in the figure. The pull rope is routed from top to bottom through the wire groove 611 and the rope fixing port of the coupling 24. When the user pulls the pull rope, the pressure plate 62 is turned in the vertical direction, and the pressure plate 62 touches the switch 23 on the piston rod 22, thereby switching the state of the entire pneumatic assembly 2.

[0041] In this case, the pneumatic assembly 2 is at the bottom and the pressure plate 62 is at the top. This spatial layout makes the entire pull rope run from top to bottom, which is smoother.

[0042] When the entire waist support needs to move forward, the piston rod 22 is pushed out, driving the transmission shaft 5 to move upward, and the sliding ends of the long board 1 31 and the long board 2 71 slide in the limit groove 1 81 and the limit groove 2 11 respectively, which, on the one hand, keeps the moving direction trajectory stable, and on the other hand, limits the front and rear telescopic distance of the entire unfolding frame to prevent excessive telescopic extension. Furthermore, for the waist and back of the human body, the force received is a resistance effect in the front and rear direction, rather than a rotational resistance.

[0043] When the entire lumbar support needs to be moved backward, the piston rod 22 is retracted, and the entire transmission principle is the same as above, but the movement direction is opposite.

[0044] like Figure 1 As shown, an auxiliary spring 4 is connected to the back frame 1, and the other end of the auxiliary spring 4 is connected to the sliding frame 33. The auxiliary spring 4 plays a role in assisting the pneumatic assembly 2. This is because the pneumatic assembly 2 is filled with inert gas, which will cause it to be not fast enough at the beginning after long-term use. When the lumbar support needs to move forward, the power comes from the pneumatic assembly 2, the piston rod 22 pushes the transmission shaft 5 upward, and the auxiliary spring 4 pulls the transmission shaft 5 upward, which plays a role in assisting the start. In addition, in this starting stage, the auxiliary spring 4 is the most extended, so the pulling force on the transmission shaft 5 is the largest.

[0045] When the lumbar support moves backward, the force comes from the force generated by the human body moving backward, so there is no requirement for the force of the pneumatic component 2, and naturally there is no need for the auxiliary spring 4 to provide auxiliary force.

[0046] A lumbar support comprises a lumbar support body and the lumbar support stretching device described above, wherein the lumbar support body is connected to a resistance frame 8.

[0047] A chair comprises chair legs, a chair frame, a stool connected to the chair frame, and the lumbar support mentioned above. The chair frame is connected to a back frame 1.

Claims

1. A lumbar support and extension device for a seat, comprising a back frame (1), characterized in that: It also comprises a pneumatic assembly (2) mounted on the back frame (1) and an expansion frame connected to the pneumatic assembly (2), wherein the expansion frame telescopes along the horizontal front-to-back direction under the movement of the pneumatic assembly (2), and a resistance frame (8) is connected to the expansion frame, and the resistance frame (8) provides a stable and uniform support force for the waist and back of the human body under the drive of the pneumatic assembly (2).

2. A lumbar support and stretching device suitable for a seat according to claim 1, characterized in that: The pneumatic assembly (2) is connected to a transmission shaft (5), the unfolding frame comprises an unfolding frame 1 (3), the unfolding frame 1 (3) comprises a long plate 1 (31) and a short plate 1 (32), the two ends of the long plate 1 (31) are respectively connected to the transmission shaft (5) and the abutment frame (8), and the two ends of the short plate 1 (32) are respectively connected to the long plate 1 (31) and the back frame (1).

3. A lumbar support and stretching device suitable for a seat according to claim 2, characterized in that: The unfolding frame comprises a second unfolding frame (7), and the second unfolding frame (7) comprises a second long board (71) and a second short board (72), the two ends of the second long board (71) are respectively connected to the back frame (1) and the abutment frame (8), and the two ends of the second short board (72) are respectively connected to the second long board (71) and the back frame (1).

4. A lumbar support and stretching device suitable for a seat according to claim 3, characterized in that: The abutment frame (8) is provided with a first limiting groove (81) extending in the vertical direction, the back frame (1) is provided with a second limiting groove (11) extending in the vertical direction, and the first long board (31) and the second long board (71) slide in the first limiting groove (81) and the second limiting groove (11) respectively.

5. The lumbar support and stretching device for a seat according to claim 2, characterized in that: The pneumatic assembly (2) comprises a cylinder (21) and a piston rod (22); the cylinder (21) is mounted on the back frame (1); and the piston rod (22) is connected to the transmission shaft (5).

6. A lumbar support and stretching device suitable for a seat according to claim 5, characterized in that: It also comprises an auxiliary spring (4), one end of the auxiliary spring (4) is connected to the back frame (1), and the other end is connected to the transmission shaft (5).

7. A lumbar support and stretching device suitable for a seat according to claim 6, characterized in that: The auxiliary spring (4) and the piston rod (22) both extend in the vertical direction; the auxiliary spring (4) is located on one side of the transmission shaft (5) in the vertical direction, and the piston rod (22) is located on the other side of the transmission shaft (5) in the vertical direction.

8. The lumbar support and stretching device for a seat according to claim 5, characterized in that: The piston rod (22) is provided with a switch (23) for controlling the operation and shutdown of the pneumatic component (2), and also includes an operating device (6) for operating and controlling the switch (23).

9. A lumbar support and stretching device suitable for a seat according to claim 8, characterized in that: The piston rod (22) is provided with a coupling frame (24) connected to the transmission shaft (5), and the operating device (6) comprises a pull rope, a rope hook (61) and a pressure plate (62) rotatably connected to the coupling frame (24), the pull rope is connected to the rope hook (61), and the pressure plate (62) is used to contact the switch (23).

10. A lumbar support and stretching device suitable for a seat according to claim 9, characterized in that: The rope hook (61), the piston rod (22) and the cylinder (21) are arranged in sequence in a vertical direction from high to low.

Images