Seat adjustment device and method of use thereof

Abstract

This invention provides a seat adjustment device and its usage method, including a base, a bottom plate, and a rocker. The base and bottom plate are rotatably connected, and the rocker is rotatably connected to the base. A second shaft is provided on the rocker, and a force-applying lever is provided on the second shaft. A spring assembly is provided between one end of the force-applying lever and the base. A guide support surface is provided on the base, forming a support assembly installation space between the guide support surface and the force-applying lever. A support assembly is installed in the support assembly installation space. A spring force adjustment mechanism is provided on the base. The base also provides an angle locking mechanism and a lifting adjustment mechanism for locking the angle of the rocker. In this invention, the spring force adjustment mechanism can adjust the position of the support assembly in the support assembly installation space, thereby changing the position of the rotation fulcrum of the force-applying lever. When the position of the rotation fulcrum changes, the elastic force and torque of the spring assembly acting on the rocker can be adjusted.

Description

Technical Field

[0001] This invention relates to the field of seating technology, and in particular to a seat adjustment device and its method of use. Background Technology

[0002] Existing height-adjustable seats typically include components such as an adjustment mechanism, backrest, cylinder, seat, and chassis. The bottom of the cylinder is connected to the chassis, and the top of the cylinder is connected to the adjustment mechanism. The backrest and seat are also connected to the adjustment mechanism. The adjustment mechanism controls the cylinder and adjusts the seat height, while also adjusting the backrest angle.

[0003] Existing seat adjustment devices typically include a base, a rocker arm, and a bottom plate. The rocker arm is rotatably connected to the base, and the backrest is connected to the rocker arm. A spring assembly is installed between the backrest and the rocker arm. In addition, a locking mechanism is installed on the base to lock the angle of the rocker arm. When adjusting the backrest angle, the rocker arm is first released through the locking mechanism to allow it to rotate relative to the base. Then, the user uses their back strength to adjust the backrest to the desired angle. Finally, the rocker arm is locked back in place through the locking mechanism to fix the backrest at the current angle.

[0004] When adjusting the backrest angle, the user needs to overcome the elastic resistance of the spring assembly. In existing adjustment devices, the elastic force of the spring assembly on the rocker arm is not adjustable when the backrest angle is adjusted. However, users of height-adjustable chairs exhibit significant differences in age, gender, and physical strength, resulting in some individuals not achieving a comfortable or controllable adjustment experience. For example, if the spring assembly's elastic force is designed to be too strong, those with weaker backrests may find it difficult to overcome the resistance to adjust the backrest angle, leading to considerable difficulty. Conversely, if the spring assembly's elastic force is designed to be too weak, stronger individuals (such as young adults) may experience a sudden backward tilt due to insufficient resistance when adjusting the backrest, easily causing instability. Furthermore, the rapid tilting speed makes it difficult for the backrest to accurately stop at the desired angle, often requiring multiple adjustments to achieve the ideal angle, causing inconvenience to the user. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of the prior art and provide a seat adjustment device and its usage method.

[0006] The objective of this invention is achieved through the following technical solution: a seat adjustment device, comprising a base, a bottom plate, and a rocker arm, wherein the base and the bottom plate are rotatably connected, and the rocker arm is rotatably connected to the base; a second shaft is provided on the rocker arm, and a force-applying lever is provided on the second shaft, with a spring assembly provided between one end of the force-applying lever and the base; a guide support surface is provided on the base, forming a support assembly installation space between the guide support surface and the force-applying lever, and a support assembly is provided in the support assembly installation space; a spring force adjustment mechanism is provided on the base to adjust the position of the support assembly in the support assembly installation space; the force-applying lever rotates with the support assembly as a fulcrum; the base is also provided with an angle locking mechanism and a lifting adjustment mechanism for locking the angle of the rocker arm.

[0007] Preferably, the support assembly includes a first support block, a second support block, and a circular shaft disposed between the first support block and the second support block. One side of the first support block contacts a guide support surface, and one side of the second support block contacts a force-applying lever. Both the first and second support blocks are provided with arc surfaces adapted to the circular shaft, and the circular shaft contacts the arc surfaces on both the first and second support blocks simultaneously.

[0008] Preferably, the first support block has a protrusion on the side near the guide support surface, and the guide support surface has a recessed area corresponding to the protrusion, with the protrusion on the first support block embedded in the recessed area on the guide support surface.

[0009] Preferably, the spring force adjustment mechanism includes a fourth shaft and a spring force adjustment handle. Both the spring force adjustment handle and the fourth shaft are rotatably engaged with the base. The fourth shaft is provided with a second adjustment gear and an arc-shaped groove plate. The arc-shaped groove plate is provided with an arc-shaped groove and a shaft hole for connecting the fourth shaft. From the beginning to the end of the arc-shaped groove, the distance between the arc-shaped groove and the center of the shaft hole gradually increases. The end of the round shaft is connected in the arc-shaped groove. Several round shaft slots are sequentially arranged in the arc-shaped groove. The fourth shaft is provided with a second adjustment gear, and the spring force adjustment handle is provided with a first adjustment gear. The first adjustment gear meshes with the second adjustment gear.

[0010] Preferably, the angle locking mechanism includes a locking adjustment handle and a locking block. The locking adjustment handle is rotatably engaged with the base. The locking adjustment handle is provided with a gear adjustment component, and the gear adjustment component is provided with a third pull rod arm. The base is provided with a locking block guide groove, and the locking block is slidably connected in the locking block guide groove. A locking block pressure plate is provided above the locking block guide groove, and a torsion spring is provided on the locking block pressure plate. One end of the torsion spring is connected to the third pull rod arm through a locking control pull rod, and the other end of the torsion spring is connected to the locking block. The rocker plate is provided with a plurality of locking grooves corresponding to the locking blocks.

[0011] Preferably, the base is provided with a lifting adjustment mechanism, which includes a lifting adjustment handle and a cylinder control component. Both the lifting adjustment handle and the cylinder control component are rotatably connected to the base. The cylinder control component is provided with a pressure application part and a second pull rod arm. The first pull rod arm and the second pull rod arm are connected by a lifting control pull rod. The cylinder control component is provided with a pressure application part, which is located above the cylinder mounting hole on the base.

[0012] Preferably, the base is provided with a constraint groove, and the two ends of the constraint groove are respectively provided with a starting limiting surface and an ending limiting surface; the second shaft is located in the constraint groove.

[0013] Preferably, the base plate is provided with a first shaft, and the rocker plate is provided with a limiting hole, through which the first shaft passes.

[0014] Preferably, both the first and second support blocks are equipped with anti-adhesion mechanisms. These mechanisms include a slider guide groove, a ball hole, a slider, a ball, and a brake cable. The slider guide groove and ball hole are both located on the first and second support blocks. The ball hole on the first support block is located on the side of the slider guide groove closest to the guide support surface, and the ball hole on the second support block is located on the side of the slider guide groove closest to the force-applying lever. The ball is placed in the ball hole, and the slider is placed in the slider guide hole. The slider has a pressure-adjusting surface that contacts one side of the ball. The brake cable includes an outer tube and an inner steel wire placed inside the outer tube. One end of the inner steel wire is connected to the slider, and one end of the outer tube is connected to the outer surface of the first or second support block. The brake cable is connected to a brake cable drive device, which includes a threaded cylinder and a threaded body. The threaded cylinder has an internal thread, and the threaded body is threaded into the threaded cylinder. The other end of the inner steel wire is connected to the threaded body of the brake cable drive device, and the other end of the outer tube is connected to the outer surface of the threaded cylinder. A return spring is provided between the slider and one end of the slider guide groove.

[0015] A method for using a seat adjustment device, the specific method is as follows: When adjusting the seat back angle, first release the rocker arm by using the angle locking mechanism. After adjusting the seat back to the target angle, lock the rocker arm back in place using the angle locking mechanism. When adjusting the spring force of the seat back, rotate the spring force adjustment handle. The spring force adjustment handle drives the fourth shaft to rotate, which in turn drives the arc-shaped groove plate to rotate. As the arc-shaped groove plate rotates, the end of the round shaft moves within the arc-shaped groove. Under the action of the arc-shaped groove plate, the support assembly moves up and down within the support assembly installation space, thereby adjusting the rotation fulcrum position of the force-applying lever. After adjustment, stop rotating the spring force adjustment handle.

[0016] The beneficial effects of this invention are as follows: In this invention, the spring force adjustment mechanism can adjust the position of the support component in the installation space of the support component, thereby changing the position of the rotation fulcrum of the force-applying lever (i.e., adjusting the ratio of the length of the lever arms on both sides of the force-applying lever); when the position of the rotation fulcrum changes, the ratio of the length of the lever arms on both sides of the force-applying lever also changes accordingly, thereby adjusting the elastic force and torque of the spring component acting on the rocker. In this way, the elastic force of the spring component on the rocker can be adjusted according to the user's needs; for users with weaker physical strength, the spring force can be adjusted to a smaller state, so that they can easily overcome the spring resistance to push the backrest to adjust the angle; while for users with stronger physical strength, the spring force can be adjusted to a larger state, avoiding the problem of the backrest "suddenly tilting backward" due to insufficient resistance, thus allowing users of different ages, genders, and physical strengths to obtain a comfortable and controllable adjustment experience. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention.

[0018] Figure 2 This is a schematic diagram of the structure in one direction after removing the base plate in Embodiment 1 of the present invention.

[0019] Figure 3 This is an exploded view of Embodiment 1 of the present invention.

[0020] Figure 4 This is a schematic diagram of the base structure.

[0021] Figure 5 This is a schematic diagram of the base and locking adjustment mechanism.

[0022] Figure 6 This is a schematic diagram of the structure of Embodiment 1 of the present invention from another direction after the bottom plate is removed.

[0023] Figure 7 This is a schematic diagram of the spring force adjustment mechanism when it is installed on the base.

[0024] Figure 8 This is a schematic diagram of the spring force adjustment mechanism.

[0025] Figure 9 This is a schematic diagram of the arc-shaped groove plate.

[0026] Figure 10 This is a structural diagram of the supporting components.

[0027] Figure 11 This is a cross-sectional view of Embodiment 1 of the present invention.

[0028] Figure 12 This is a schematic diagram of the adjustment process when the support component is located in different positions according to Embodiment 1 of the present invention.

[0029] Figure 13 This is a cross-sectional view of Embodiment 2 of the present invention.

[0030] Figure 14 for Figure 13 Enlarged view of section A.

[0031] Figure 15 for Figure 13 Enlarged view of section B in the middle.

[0032] In the diagram: 1. Base; 1-1. Constraint groove; 1-1a. Starting limiting surface; 1-1b. Ending limiting surface; 1-2. Lock block guide groove; 1-3. Guide support surface; 1-4. Cylinder mounting hole; 2. Base plate; 3. Rocker; 3-1. Limiting hole; 3-2. Locking groove; 4. Lifting adjustment handle; 4-1. First pull rod arm; 4-2. Operating part; 5. Spring force adjustment handle; 6. Locking adjustment handle; 8. Lifting control pull rod; 9. Cylinder control component; 9-1. Second pull rod arm; 9-2. Pressing part; 10. First shaft; 11. Second shaft; 12. Force application lever; 13. Spring seat connecting shaft; 14. First spring fixing seat; 15. Spring assembly; 16. Second spring fixing seat; 17. First hinge; 18. First adjusting gear. 19. Second adjusting gear; 20. Arc-shaped groove plate; 20-1. Shaft hole; 20-2. Arc-shaped groove; 21. Second hinge; 22. Third shaft; 24. Gear adjustment component; 25. Locking control lever; 26. Locking block; 27. Locking block pressure plate; 27-1. Torsion spring through slot; 28. Torsion spring; 29. ​​Torsion spring fixing screw; 31. Support assembly; 31-1. First support block; 31-2. Second support block; 31-3. Round shaft; 32. Fourth shaft; 33. Brake cable; 33-1. Inner steel wire; 33-2. Outer sleeve; 34. Slider guide groove; 35. Steel ball hole; 36. Slider; 36-1. Top pressure inclined surface; 37. Steel ball; 38. Return spring; 39. Threaded cylinder; 40. Threaded body; 41. Rotary handle; 42. Rotary joint. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0034] Example 1: like Figures 1 to 12As shown, a seat adjustment device includes a base 1, a base plate 2, and a rocker 3. The base 1 and the base plate 2 are rotatably connected, and the rocker 3 is rotatably connected to the base 1. A second shaft 11 is provided on the rocker 3, and a force-applying lever 12 is provided on the second shaft 11. A spring assembly 15 is provided between one end of the force-applying lever 12 and the base 1. A guide support surface 1-3 is provided on the base 1, and a support assembly 31 installation space is formed between the guide support surface 1-3 and the force-applying lever 12. A support assembly 31 is installed in the support assembly 31 installation space. A spring force adjustment mechanism is provided on the base 1 to adjust the position of the support assembly 31 in the support assembly 31 installation space. The force-applying lever 12 rotates with the support assembly 31 as a rotation fulcrum. The base 1 is also provided with an angle locking mechanism and a lifting adjustment mechanism for locking the angle of the rocker 3.

[0035] The rocker arm 3 is connected to the backrest of the seat. One end of the force-applying lever 12 is connected to the second shaft 11, and the other end is connected to the spring assembly 15. The spring assembly 15 applies an elastic force to one end of the force-applying lever 12, which acts on the rocker arm 3 through the lever 12, thereby creating a torque that causes the rocker arm 3 to rotate automatically upward. If the user needs to adjust the angle of the backrest downward, this torque must be overcome to rotate the backrest downward. When adjusting the backrest angle, the backrest will drive the rocker arm 3 to rotate, and the rotation of the rocker arm 3 will drive the force-applying lever 12 to rotate. The force-applying lever 12 rotates with the support assembly 31 as the pivot point. In this invention, the spring force adjustment mechanism can adjust the position of the support assembly 31 in the installation space of the support assembly 31, thereby changing the position of the rotation fulcrum of the force-applying lever 12 (i.e., adjusting the ratio of the lengths of the lever arms on both sides of the force-applying lever 12). When the position of the rotation fulcrum changes, the ratio of the lengths of the lever arms on both sides of the force-applying lever 12 also changes accordingly, thereby adjusting the elastic force and torque of the spring assembly 15 acting on the rocker 3. In this way, the elastic force of the spring assembly 15 on the rocker 3 can be adjusted according to the user's needs. For users with weaker physical strength, the spring force can be adjusted to a smaller state, so that they can easily overcome the spring resistance to push the backrest to adjust the angle; while for users with stronger physical strength, the spring force can be adjusted to a larger state to avoid the problem of the backrest "suddenly tilting backward" due to insufficient resistance, so that users of different ages, genders, and physical strengths can obtain a comfortable and controllable adjustment experience.

[0036] The spring assembly 15 has a first spring fixing seat 14 and a second spring fixing seat 16 at its two ends. The first spring fixing seat 14 is rotatably connected to the force-applying lever 12, and the second spring fixing seat 16 is rotatably connected to the base 1.

[0037] The rocker arm 3 is connected to the base 1 via a first hinge 17, and the rocker arm 3 and the base 1 can rotate relative to each other around the first hinge 17. The base plate 2 is connected to the base 1 via a second hinge 21, and the base plate 2 and the base 1 can rotate relative to each other around the second hinge 21.

[0038] like Figure 10 As shown, the support assembly 31 includes a first support block 31-1, a second support block 31-2, and a circular shaft 31-3 disposed between the first support block 31-1 and the second support block 31-2. One side of the first support block 31-1 contacts the guide support surface 1-3, and one side of the second support block 31-2 contacts the force-applying lever 12. Both the first support block 31-1 and the second support block 31-2 are provided with arc surfaces adapted to the circular shaft 31-3, and the circular shaft 31-3 simultaneously contacts the arc surfaces on both the first support block 31-1 and the second support block 31-2. The circular shaft 31-3 is disposed between the first support block 31-1 and the second support block 31-2, and the first support block 31-1 and the second support block 31-2 can rotate using the circular shaft 31-3 as a rotation center. The arc surfaces of the first support block 31-1 and the second support block 31-2 are in contact with the circular shaft 31-3. When the force lever 12 rotates with the rocker 3, the first support block 31-1 and the second support block 31-2 can rotate relative to each other through the circular shaft 31-3. The presence of the circular shaft 31-3 greatly reduces the rotational resistance and avoids the "stuttering" feeling during adjustment, which is especially friendly to users with weaker physical strength.

[0039] The first support block 31-1 has a protrusion on the side near the guide support surface 1-3, and the guide support surface 1-3 has a corresponding recessed area. The protrusion on the first support block 31-1 is embedded in the recessed area on the guide support surface 1-3. The recessed area is arranged vertically, and the movement direction of the support assembly 31 is limited by the cooperation between the protrusion and the recessed area.

[0040] The spring force adjustment mechanism includes a fourth shaft 32 and a spring force adjustment handle 5. Both the spring force adjustment handle 5 and the fourth shaft 32 are rotatably connected to the base 1. The fourth shaft 32 is provided with a second adjustment gear 19 and an arc-shaped groove plate 20. The arc-shaped groove plate 20 is provided with an arc-shaped groove 20-2 and a shaft hole 20-1 for connecting the fourth shaft 32. From the beginning to the end of the arc-shaped groove 20-2, the distance between the center of the arc-shaped groove 20-2 and the center of the shaft hole 20-1 gradually increases. The end of the round shaft 31-3 is connected in the arc-shaped groove 20-2. Several round shaft slots are sequentially arranged in the arc-shaped groove 20-2. The fourth shaft 32 is provided with the second adjustment gear 19, and the spring force adjustment handle 5 is provided with a first adjustment gear 18, which meshes with the second adjustment gear 19. The two ends of the fourth shaft 32 are rotatably connected to the base 1. The cross-section of the fourth shaft 32 is a regular hexagon.

[0041] When the user rotates the spring force adjustment handle 5, the first adjustment gear 18 on the spring force adjustment handle 5 will rotate synchronously; since the first adjustment gear 18 meshes with the second adjustment gear 19 on the fourth shaft 32, the power is transmitted to the fourth shaft 32 through gear transmission, causing the fourth shaft 32 and the arc-shaped groove plate 20 fixed on it to rotate together; the arc-shaped groove 20-2 on the arc-shaped groove plate 20 fits with the end of the round shaft 31-3, and the distance between the arc-shaped groove 20-2 and the center of the shaft hole 20-1 is... The distance gradually increases from the starting end to the ending section; when the arc-shaped groove plate 20 rotates with the fourth shaft 32, the arc-shaped groove 20-2 generates a pushing or pulling force on the circular shaft 31-3 through the groove wall, forcing the circular shaft 31-3 to move along the guide support surface 1-3 of the base 1 (the circular shaft 31-3 is constrained by the support component 31 and cannot move in a circle with the arc-shaped groove plate 20, but can only translate along a straight line or a specific trajectory), thereby realizing the adjustment of the position of the support component 31, and then adjusting the position of the rotation fulcrum of the force-applying lever 12.

[0042] Several cylindrical shaft locking positions are provided within the arc-shaped groove 20-2, which can limit the movement of the cylindrical shaft 31-3 to the corresponding position. When the user stops rotating the adjustment handle, the cylindrical shaft locking positions prevent the cylindrical shaft 31-3 from moving on its own under the reaction force of the spring assembly 15, ensuring the stability of the support assembly 31 and thus maintaining the set state of the spring force. Furthermore, a slight "sticking" sensation is produced when the cylindrical shaft 31-3 enters the cylindrical shaft locking position, which, together with the change in the rotational resistance of the handle, provides the user with clear feedback on the gear shift, making it easier to perceive the current spring force state and reducing accidental operation.

[0043] The angle locking mechanism includes a locking adjustment handle 6 and a locking block 26. The locking adjustment handle 6 is rotatably engaged with the base 1. The locking adjustment handle 6 is equipped with a gear adjustment component 24, and the gear adjustment component 24 is equipped with a third pull rod arm. The base 1 is equipped with a locking block guide groove 1-2, and the locking block 26 is slidably connected in the locking block guide groove 1-2. A locking block pressure plate 27 is provided above the locking block guide groove 1-2, and a torsion spring 28 is provided on the locking block pressure plate 27. One end of the torsion spring 28 is connected to the third pull rod arm through a locking control pull rod 25, and the other end of the torsion spring 28 is connected to the locking block 26. The rocker plate 3 is equipped with several locking grooves 3-2 corresponding to the locking blocks 26. The locking block pressure plate 27 is equipped with a torsion spring fixing screw 29, and the middle part of the torsion spring 28 is sleeved on the torsion spring fixing screw 29, allowing the torsion spring to rotate around the torsion spring fixing screw 29. The locking plate 27 is also provided with a torsion spring through slot 27-1 for one end of the torsion spring to pass through.

[0044] When the user turns the locking adjustment handle 6 in one direction, the gear adjustment component 24 on the handle rotates synchronously, causing the third pull arm on it to swing. The third pull arm pulls one end of the torsion spring through the locking control lever 25, causing the torsion spring to deform and twist. Since the other end of the torsion spring is connected to the locking block 26, and the locking block 26 is restricted by the locking block guide groove 1-2 (it can only slide along the groove), the rotation of the torsion spring will cause the locking block 26 to move along the guide groove away from the rocker 3, eventually causing the locking block 26 to disengage from the locking groove 3-2 on the rocker 3. At this time, the rocker 3 is unlocked. The rocker arm 3 can be adjusted in angle as the backrest rotates. Conversely, when the user releases the locking adjustment handle 6 or rotates the locking adjustment handle 6 in another direction, the pulling force of the third lever arm on the locking control lever 25 disappears, and the torsion spring resets under its own elastic restoring force, pushing the locking block 26 to move along the guide groove towards the rocker arm 3. When the rocker arm 3 rotates to the target angle, the locking block 26 is engaged in the corresponding locking groove 3-2 under the thrust of the torsion spring. Through the mechanical engagement between the locking block 26 and the locking groove 3-2, the rocker arm 3 is restricted from continuing to rotate, thus fixing the backrest angle.

[0045] The lifting and adjusting mechanism includes a lifting and adjusting handle 4 and a cylinder control component 9. Both the lifting and adjusting handle 4 and the cylinder control component 9 are rotatably connected to the base 1. The cylinder control component 9 is provided with a pressure applying part 9-2 and a second pull rod arm 9-1. The first pull rod arm 4-1 and the second pull rod arm 9-1 are connected by a lifting control pull rod 8. The pressure applying part 9-2 is located above the cylinder mounting hole 1-4 on the base 1. The base 1 is provided with a third shaft 22. The main body of the cylinder control component 9 is a circular tube structure. The cylinder control component 9 is sleeved on the third shaft 22 and can rotate around the third shaft 22.

[0046] When the user rotates the height adjustment handle 4, the handle 4 will drive the connected first lever arm 4-1 to rotate. The first lever arm 4-1 is connected to the second lever arm 9-1 on the cylinder control component 9 via the height control lever 8. Therefore, the rotation of the first lever arm 4-1 will be transmitted to the second lever arm 9-1 through the height control lever 8, thereby driving the cylinder control component 9 to rotate. The cylinder control component 9 is provided with a pressure part 9-2. When the cylinder control component 9 rotates, the pressure part 9-2 will rotate accordingly. The upper end of the seat's cylinder component will enter and exit the cylinder mounting hole 1-4 on the base 1. The upper end of the cylinder component is provided with a height control lever for triggering the cylinder's height adjustment. The rotation of the pressure part 9-2 will trigger the height control lever on the top of the cylinder component, thereby controlling the height adjustment of the cylinder and realizing the height adjustment function of the entire seat.

[0047] The lifting adjustment handle 4 is a cylindrical structure and is sleeved on the outside of the spring force adjustment handle 5. An operating part 4-2 is provided on the lifting adjustment handle 4, allowing for convenient rotation of the lifting adjustment handle 4.

[0048] The base 1 is provided with a constraint groove 1-1, and the two ends of the constraint groove 1-1 are respectively provided with a starting limiting surface 1-1a and a termination limiting surface 1-1b; the second shaft 11 is located in the constraint groove 1-1.

[0049] A first shaft 10 is provided on the base plate 2, and a limiting hole 3-1 is provided on the rocker plate 3, through which the first shaft 10 passes. The limiting hole 3-1 has an oblong structure, allowing the first shaft 10 to have a certain amount of room to move within it.

[0050] A method for using a seat adjustment device, the specific method is as follows: When adjusting the seat back angle, first release the rocker arm 3 by using the angle locking mechanism. After the user adjusts the seat back to the target angle, lock the rocker arm 3 back to the target angle using the angle locking mechanism. When adjusting the spring force of the seat back, rotate the spring force adjustment handle 5. The spring force adjustment handle 5 drives the fourth shaft 32 to rotate. The fourth shaft 32 drives the arc-shaped groove plate 20 to rotate. When the arc-shaped groove plate 20 rotates, the end of the round shaft 31-3 will move in the arc-shaped groove 20-2. Under the action of the arc-shaped groove plate 20, the support assembly 31 moves up and down within the installation space of the support assembly 31, thereby adjusting the rotation fulcrum position of the force application lever 12. After the adjustment is completed, stop rotating the spring force adjustment handle 5.

[0051] Example 2: like Figures 13 to 15As shown, the difference between Embodiment 2 and Embodiment 1 is that in Embodiment 2, both the first support block 31-1 and the second support block 31-2 are provided with anti-adhesion mechanisms. These mechanisms include a slider guide groove 34, a steel ball hole 35, a slider 36, a steel ball 37, and a brake line 33. The slider guide groove 34 and the steel ball hole 35 are both located on the first support block 31-1 and the second support block 31-2. The steel ball hole 35 on the first support block 31-1 is located on the side of the slider guide groove 34 closest to the guide support surface 1-3, and the steel ball hole 35 on the second support block 31-2 is located on the side of the slider guide groove 34 closest to the force application lever 12. The steel ball 37 is disposed in the steel ball hole 35, and the slider 36 is disposed in the guide hole of the slider 36. The slider 36 is provided with a top-pressing inclined surface 36-1. 6-1 contacts one side of the steel ball 37; the brake line 33 includes an outer tube 33-2 and an inner steel wire 33-1 disposed in the outer tube 33-2. One end of the inner steel wire 33-1 is connected to the slider 36, and one end of the outer tube 33-2 is connected to the outer side of the first support block 31-1 or the second support block 31-2; the brake line 33 is connected to the brake line 33 drive device, which includes a threaded cylinder 39 and a threaded body 40. The threaded cylinder 39 has an internal thread, and the threaded body 40 is threadedly connected to the threaded cylinder 39; the other end of the inner steel wire 33-1 is connected to the threaded body 40 of the brake line 33 drive device, and the other end of the outer tube 33-2 is connected to the outer surface of the threaded cylinder 39; a return spring 38 is disposed between the slider 36 and one end of the slider guide groove 34.

[0052] A rotating handle 41 is provided on the threaded body 40. The inner steel wire 33-1 is connected to the threaded body 40 through a rotary joint. The rotary joint allows the threaded body 40 and the steel wire rope to rotate relative to each other, thereby preventing the inner steel wire 33-1 from rotating together when the threaded body 40 rotates.

[0053] In normal use, users do not frequently adjust the position of the support component 31 using the spring force adjustment mechanism. This means that after the last adjustment, the support component 31 may remain in position for a considerable period before the next adjustment (for example, after a change of users, the new user may readjust the spring force). The first support block 31-1 and the second support block 31-2 maintain contact with the guide support surface 1-3 and the force lever 12 under constant pressure for extended periods. This can easily lead to adhesion between the contact surfaces of the first support block 31-1 and the guide support surface 1-3, and also between the second support block 31-2 and the force lever 12. Without lubrication or with lubrication failure, the microscopically contacting metal surfaces will gradually fuse due to "metallic bond adsorption." At room temperature, if the oxide layer on the metal surface is damaged by compression, direct contact with fresh metal surfaces will generate a welding-like bonding force (i.e., "cold welding"). Because the support blocks and contact surfaces remain stationary for extended periods, this bonding force gradually accumulates, eventually resulting in the "adhesion" of the contact surfaces. Furthermore, dust and fibers from the environment (such as fibers shed from seat fabric) can enter the contact surface and mix with residual grease to form "sludge." This sludge not only loses its lubricating effect but also acts like an adhesive, binding the contact surfaces together. Especially under pressure, the sludge will be compacted, further enhancing the adhesion. Once adhesion occurs, it can cause the support component 31 to become difficult to move.

[0054] To solve the problem of the support component 31 being difficult to move due to contact surface adhesion, the present invention provides an anti-adhesion mechanism on the first support block 31-1 and the second support block 31-2, which can effectively solve this problem.

[0055] Under normal use (i.e., without needing to adjust the position of the support assembly 31), the steel ball 37 is completely located within the steel ball hole 35, and because the slider 36 does not apply an active pushing force, the steel ball 37 does not protrude from the steel ball hole 35. When the contact surfaces of the first support block 31-1 and the second support block 31-2 become stuck, making it difficult to adjust the support assembly 31, the user rotates the threaded body 40 in one direction. Utilizing the threaded engagement between the threaded cylinder 39 and the threaded body 40, the rotational motion is converted into linear motion, causing the threaded body 40 to move axially along the threaded cylinder 39. Since the end of the inner steel wire 33-1 away from the slider 36 is connected to the threaded body 40, and the other end of the outer sleeve 33-2 is in contact with the outer surface of the threaded cylinder 39 (the outer sleeve 33-2 is fixed, only the inner steel wire 33-1 can move), the screw... The axial movement of the texture 40 generates a tension force on the inner steel wire 33-1, which is then transmitted to the slider 36. The tension force of the inner steel wire 33-1 overcomes the elastic force of the return spring 38, causing the slider 36 to move along the slider guide groove 34. When the slider 36 moves, the top pressure inclined surface 36-1 on the slider 36 contacts one side of the steel ball 37. As the slider 36 moves, the top pressure inclined surface 36-1 generates a component force on the steel ball 37 in the direction of the force application lever 12 or the direction of the guide support surface 1-3. Under the action of this component force, the steel ball 37 moves towards the force application lever. The steel ball 37 moves outward from the steel ball hole 35 in the 12th direction or the guide support surface 1-3 direction. After the steel ball 37 protrudes from the steel ball hole 35, it will contact the guide support surface 1-3 (first support block side) or the surface of the force lever 12 (second support block side) and apply a pushing force perpendicular to the contact surface. This pushing force will push the first support block 31-1 away from the guide support surface 1-3 or push the second support block 31-2 away from the force lever 12, thereby separating the first support block 31-1 from the guide support surface 1-3 or the second support block 31-2 from the force lever 12. The first support block 31-1 is separated from the force-applying lever 12, creating a certain gap. The steel ball 37 then "prys open" the first support block 31-1 from the guide support surface 1-3 and the second support block 31-2 from the surface of the force-applying lever 12. This separation of the contact surfaces completely eliminates the adhesion problem between the first support block 31-1 and the second support block 31-2, allowing the support assembly 31 to resume its low-resistance sliding state. After eliminating the adhesion problem, the user rotates the threaded body 40 in the opposite direction to reset the slider 36, causing the steel ball 37 to retract back into the steel ball hole 35. After eliminating the adhesion problem, the position of the support assembly 31 can be adjusted normally using the spring force adjustment mechanism.

[0056] The remaining structures of Example 2 are the same as those of Example 1.

[0057] This invention is not limited to the preferred embodiments described above. Anyone can derive other products in various forms under the guidance of this invention. However, regardless of any changes in shape or structure, any technical solution that is the same as or similar to this application falls within the protection scope of this invention.

Claims

1. A seat adjustment device, characterized by, The system includes a base, a base plate, and a rocker arm. The base and base plate are rotatably connected, and the rocker arm is rotatably connected to the base. A second shaft is mounted on the rocker arm, and a force-applying lever is mounted on the second shaft. A spring assembly is mounted between one end of the force-applying lever and the base. A guide support surface is mounted on the base, forming a support assembly mounting space between the guide support surface and the force-applying lever. A support assembly is mounted within this mounting space. A spring force adjustment mechanism is mounted on the base to adjust the position of the support assembly within the mounting space. The force-applying lever rotates with the support assembly as its fulcrum. The base is also equipped with an angle locking mechanism and a lifting adjustment mechanism for locking the angle of the rocker. The support assembly includes a first support block, a second support block, and a cylindrical shaft disposed between the first and second support blocks. One side of the first support block contacts a guide support surface, and one side of the second support block contacts a force-applying lever. Both the first and second support blocks have arcuate surfaces adapted to the cylindrical shaft, and the cylindrical shaft simultaneously contacts the arcuate surfaces of both the first and second support blocks. The first support block has a protrusion on the side closest to the guide support surface, and the guide support surface has a corresponding recessed area; the protrusion on the first support block is embedded in the recessed area on the guide support surface. The spring force... The adjustment mechanism includes a fourth shaft and a spring force adjustment handle. Both the spring force adjustment handle and the fourth shaft are rotatably engaged with the base. The fourth shaft is provided with a second adjustment gear and an arc-shaped groove plate. The arc-shaped groove plate is provided with an arc-shaped groove and a shaft hole for connecting the fourth shaft. From the beginning to the end of the arc-shaped groove, the distance between the arc-shaped groove and the center of the shaft hole gradually increases. The end of the round shaft is connected in the arc-shaped groove. Several round shaft slots are sequentially arranged in the arc-shaped groove. The fourth shaft is provided with a second adjustment gear, and the spring force adjustment handle is provided with a first adjustment gear. The first adjustment gear meshes with the second adjustment gear.

2. A seat adjustment device according to claim 1, wherein The angle locking mechanism includes a locking adjustment handle and a locking block. The locking adjustment handle is rotatably engaged with the base. The locking adjustment handle is equipped with a gear adjustment component, and the gear adjustment component is equipped with a third pull rod arm. The base is equipped with a locking block guide groove, and the locking block is slidably connected in the locking block guide groove. A locking block pressure plate is provided above the locking block guide groove, and a torsion spring is provided on the locking block pressure plate. One end of the torsion spring is connected to the third pull rod arm through a locking control pull rod, and the other end of the torsion spring is connected to the locking block. The rocker plate is equipped with several locking grooves corresponding to the locking blocks.

3. A seat adjustment device according to claim 1, wherein The base is provided with a lifting adjustment mechanism, which includes a lifting adjustment handle and a cylinder control component. Both the lifting adjustment handle and the cylinder control component are rotatably connected to the base. The cylinder control component is provided with a pressure application part and a second pull rod arm. The first pull rod arm and the second pull rod arm are connected by a lifting control pull rod. The cylinder control component is provided with a pressure application part, which is located above the cylinder mounting hole on the base.

4. A seat adjustment device according to claim 1, characterized in that, The base is provided with a constraint groove, and the two ends of the constraint groove are respectively provided with a starting limiting surface and an ending limiting surface; the second shaft is located in the constraint groove.

5. A seat adjustment device according to claim 1, wherein The base plate is provided with a first shaft, and the rocker plate is provided with a limiting hole, through which the first shaft passes.

6. A seat adjustment device according to claim 1, wherein Both the first and second support blocks are equipped with anti-adhesion mechanisms. These mechanisms include a slider guide groove, a steel ball hole, a slider, a steel ball, and a brake cable. The slider guide groove and steel ball hole are located on both the first and second support blocks. The steel ball hole on the first support block is located on the side of the slider guide groove closest to the guide support surface, and the steel ball hole on the second support block is located on the side of the slider guide groove closest to the force-applying lever. The steel ball is placed in the steel ball hole, and the slider is placed in the slider guide hole. A pressure-adjusting surface is provided on the slider, contacting one side of the steel ball. The brake cable includes an outer tube and an inner steel wire placed within the outer tube. One end of the inner steel wire is connected to the slider, and one end of the outer tube is connected to the outer surface of the first or second support block. The brake cable is connected to a brake cable drive device, which includes a threaded cylinder and a threaded body. The threaded cylinder has an internal thread, and the threaded body is threaded into the threaded cylinder. The other end of the inner steel wire is connected to the threaded body of the brake cable drive device, and the other end of the outer tube is connected to the outer surface of the threaded cylinder. A return spring is provided between the slider and one end of the slider guide groove.

7. A method of using a seat adjustment device according to claim 1, characterized in that The specific method is as follows: When adjusting the seat back angle, first release the rocker arm by using the angle locking mechanism. After the user adjusts the seat back to the target angle, lock the rocker arm again by using the angle locking mechanism. When adjusting the spring force of the seat back, rotate the spring force adjustment handle. The spring force adjustment handle drives the fourth shaft to rotate, which in turn drives the arc-shaped groove plate to rotate. When the arc-shaped groove plate rotates, the end of the round shaft will move in the arc-shaped groove. Under the action of the arc-shaped groove plate, the support assembly moves up and down within the support assembly installation space, thereby adjusting the rotation fulcrum position of the force-applying lever. After adjustment, stop rotating the spring force adjustment handle.

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