Cable control spring adjustment mechanism for a seat

Abstract

The utility model provides a kind of pull wire control spring adjusting mechanism for seat, including pedestal, hingedly on pedestal and be connected with the warped plate, main spring assembly, first adjustable spring assembly, second adjustable spring assembly, the both ends of main spring assembly are connected with warped plate and pedestal respectively, and one end of first adjustable spring assembly and second adjustable spring assembly is connected with warped plate;Pedestal is rotatably connected with adjusting shaft, and adjusting shaft is provided with the first rotary adjusting part corresponding with first adjustable spring assembly and the second rotary adjusting part corresponding with second adjustable spring assembly.The utility model in the present application, adjusting drive mechanism is used to drive adjusting shaft rotation to change the pre-pressing state of first adjustable spring assembly and second adjustable spring assembly, i.e., the elastic force of first adjustable spring assembly and second adjustable spring assembly to warped plate can be adjusted, so as to adjust the overall force of spring assembly to warped plate, so as to adapt to the needs of users of different age groups and different physical conditions.

Description

Technical Field

[0001] This utility model relates to the field of seat technology, and in particular to a cable-controlled spring adjustment mechanism for seats. Background Technology

[0002] Existing height-adjustable seats typically include components such as an adjustment device, backrest, cylinder, seat, and chassis. Among these, the adjustment device is located at the lower end of the seat and serves to adjust the angle of the backrest.

[0003] Existing seat adjustment devices typically include a base and a rocker arm, with the rocker arm rotatably connected to the base. The seat back is connected to the rocker arm, and a spring assembly is installed between the backrest and the rocker arm. When adjusting the angle of the rocker arm, the locking mechanism on the adjustment device is first released to release the rocker arm, allowing it to rotate relative to the base. Then, the user's back strength is used to adjust the backrest to the desired angle. Finally, the rocker arm is locked in place by the locking mechanism to fix the backrest at the current angle.

[0004] In existing seat adjustment mechanisms, the elastic force of the spring assembly on the rocker arm is usually not adjustable. However, users of height-adjustable seats 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 physical strength may find it difficult to overcome the resistance of the spring assembly to adjust the backrest angle, leading to considerable difficulty in adjusting the backrest angle. Conversely, if the spring assembly's elastic force is designed to be too weak, those with stronger physical strength, due to their typically greater back strength, may experience a sudden "backrest tilt" when adjusting the backrest due to insufficient resistance, easily causing the user to lose stability. Furthermore, the excessively rapid tilting speed of the backrest prevents it from accurately stopping at the desired angle, causing inconvenience in practical use. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies and provide a cable-controlled spring adjustment mechanism for seats.

[0006] The purpose of this utility model is achieved through the following technical solution: a cable-controlled spring adjustment mechanism for a seat, comprising a base, a rocker plate rotatably connected to the base, a main spring assembly, a first adjustable spring assembly, and a second adjustable spring assembly. Both ends of the main spring assembly are connected to the rocker plate and the base, respectively. One end of each of the first and second adjustable spring assemblies is connected to the rocker plate. An adjustment shaft is rotatably connected to the base, and the adjustment shaft is provided with a first rotary adjustment component corresponding to the first adjustable spring assembly and a second rotary adjustment component corresponding to the second adjustable spring assembly. The adjustment shaft is connected to an adjustment drive mechanism, which drives the adjustment shaft to rotate to change the pre-compression state of the first and second adjustable spring assemblies.

[0007] Preferably, the base is provided with a guide member, and the guide member is provided with a guide groove corresponding to the first adjustable spring assembly and the second adjustable spring assembly; a sliding body is provided at the end of the first adjustable spring assembly near the first rotary adjustment component and at the end of the second adjustable spring assembly near the second rotary adjustment component; the sliding body is connected in the guide groove.

[0008] Preferably, the adjustment drive mechanism includes an adjustment handwheel seat, an adjustment handwheel, a wire fixing seat, and a wire adjusting wheel. The adjustment handwheel is rotatably connected to the adjustment handwheel seat, and the wire adjusting wheel is connected to the rotating shaft. A first wire and a second wire are provided between the adjustment handwheel and the wire adjusting wheel. When the adjustment handwheel rotates, it drives the wire adjusting wheel to rotate.

[0009] Preferably, both the first and second pull wires consist of an outer tube and an inner pull wire; the two ends of the inner pull wire of the first pull wire are connected to the adjusting handwheel and the pull wire adjusting wheel, respectively, and the two ends of the outer tube of the first pull wire are connected to the adjusting handwheel seat and the pull wire fixing seat, respectively; the two ends of the inner pull wire of the second pull wire are connected to the adjusting handwheel and the pull wire adjusting wheel, respectively, and the two ends of the outer tube of the second pull wire are connected to the adjusting handwheel seat and the pull wire fixing seat, respectively.

[0010] Preferably, the first rotary adjustment component is provided with two first compression bosses, and the second rotary adjustment component is provided with two second compression bosses.

[0011] Preferably, the angle between the two first compression bosses is 90 degrees, and the angle between the two second compression bosses is 180 degrees.

[0012] Preferably, the adjusting shaft is provided with an indexing wheel, the base is provided with a guide hole, the guide hole is provided with a pressing member corresponding to the indexing wheel, and a pressing spring is provided between the pressing member and the base; the indexing wheel is provided with a number of positioning recesses that cooperate with the pressing member in the circumferential direction.

[0013] Preferably, the rocker is provided with a rotating shaft and a connecting shaft, and the rocker is rotatably connected to the base through the rotating shaft; the connecting shaft is used to connect the first adjustable spring assembly, the second adjustable spring assembly and the main spring assembly.

[0014] The beneficial effects of this utility model are as follows: In this utility model, the main spring assembly provides basic elastic force, and the adjustment shaft is driven to rotate by the adjustment drive mechanism to change the pre-compression state of the first adjustable spring assembly and the second adjustable spring assembly. By changing the pre-compression state (pre-compression length) of the adjustable spring assembly, the elastic force of the first adjustable spring assembly and the second adjustable spring assembly on the rocker can be adjusted, thereby adjusting the overall force of the spring assembly on the rocker. In this way, the resistance when the seat back rotates can be adjusted, thus adapting to the needs of users of different ages and physical conditions. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the base and rocker arm.

[0017] Figure 3 This is a schematic diagram of the structure of this utility model after removing the base.

[0018] Figure 4 for Figure 3 Enlarged view of section A.

[0019] Figure 5 This is a schematic diagram of the structure of this utility model after removing the base.

[0020] Figure 6 This is a schematic diagram of the structure of the adjustment drive mechanism and the adjustment actuator.

[0021] Figure 7 An exploded view of the adjustment drive mechanism and the adjustment actuator.

[0022] Figure 8 This diagram illustrates the switching of the actuator to three different states.

[0023] In the diagram: 1. Base; 2. Rocker; 2-1. Rotating shaft; 2-2. Connecting shaft; 3. Main spring assembly; 4. First adjustable spring assembly; 5. Second adjustable spring assembly; 6. First rotary adjustment component; 6-1. First compression boss; 7. Second rotary adjustment component; 7-1. Second compression boss; 8. Adjustment drive mechanism; 8-1. Adjustment handwheel seat; 8-2. Pull wire fixing seat; 8-3. Adjustment handwheel; 8-4. First pull wire; 8-5. Second pull wire; 8-6. Pull wire adjustment wheel; 9. Guide component; 9-1. Guide groove; 10. Top pressure component; 11. Adjustment shaft; 12. Indexing wheel; 14. Top pressure spring; 15. Sliding body. 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. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0025] like Figures 1 to 8 As shown, the cable-controlled spring adjustment mechanism for a seat includes a base 1, a rocker 2 rotatably connected to the base 1, a main spring assembly 3, a first adjustable spring assembly 4, and a second adjustable spring assembly 5. Both ends of the main spring assembly 3 are connected to the rocker 2 and the base 1, respectively. One end of both the first adjustable spring assembly 4 and the second adjustable spring assembly 5 is connected to the rocker 2. An adjustment shaft 11 is rotatably connected to the base 1. The adjustment shaft 11 is equipped with a first rotary adjustment component 6 corresponding to the first adjustable spring assembly 4 and a second rotary adjustment component 7 corresponding to the second adjustable spring assembly 5. The adjustment shaft 11 is connected to an adjustment drive mechanism 8, which drives the adjustment shaft 11 to rotate, thereby changing the preload state of the first adjustable spring assembly 4 and the second adjustable spring assembly 5.

[0026] In this invention, the main spring assembly 3 provides basic elastic force. The adjustment drive mechanism 8 drives the adjustment shaft 11 to rotate, thereby changing the pre-compression state of the first adjustable spring assembly 4 and the second adjustable spring assembly 5. By changing the pre-compression state (pre-compression length) of the adjustable spring assembly, the elastic force of the first adjustable spring assembly 4 and the second adjustable spring assembly 5 on the rocker 2 can be adjusted, thereby adjusting the overall force of the spring assembly on the rocker 2. In this way, the resistance when the seat back rotates can be adjusted, thus adapting to the needs of users of different ages and physical conditions.

[0027] For those with less physical strength, the overall elasticity of the spring assembly can be reduced to make adjusting the backrest angle easier; for those with more physical strength, the overall elasticity of the spring assembly can be reduced to avoid the problem of "suddenly tilting backward" due to insufficient resistance when adjusting the backrest.

[0028] The adjusting shaft 11, the first rotating adjusting component 6, and the second rotating adjusting component 7 together constitute the adjusting actuator. When the adjusting shaft 11 rotates, it drives the first rotating adjusting component 6 and the second rotating adjusting component 7 to rotate synchronously.

[0029] A guide member 9 is provided on the base 1, and a guide groove 9-1 corresponding to the first adjustable spring assembly 4 and the second adjustable spring assembly 5 is provided on the guide member 9. A slider 15 is provided at the end of the first adjustable spring assembly 4 near the first rotary adjustment component 6 and at the end of the second adjustable spring assembly 5 near the second rotary adjustment component 7. The slider 15 is connected in the guide groove 9-1. The first adjustable spring assembly 4 and the second adjustable spring assembly 5 are arranged in parallel, and the axial direction of the guide groove is approximately the same as the length direction of the first adjustable spring assembly 4. When the preload length of the first adjustable spring assembly 4 and the second adjustable spring assembly 5 is changed, the slider 15 at their ends is confined within the guide groove, thereby limiting the movement direction of the spring assembly and preventing lateral displacement or tilting of the spring due to uneven force.

[0030] Specifically, the adjustment drive mechanism 8 includes an adjustment handwheel seat 8-1, an adjustment handwheel 8-3, a pull wire fixing seat 8-2, and a pull wire adjusting wheel 8-6. The adjustment handwheel 8-3 is rotatably connected to the adjustment handwheel seat 8-1, and the pull wire adjusting wheel 8-6 ​​is connected to the rotating shaft 2-1. A first pull wire 8-4 and a second pull wire 8-5 are provided between the adjustment handwheel 8-3 and the pull wire adjusting wheel 8-6. When the adjustment handwheel 8-3 rotates, it drives the pull wire adjusting wheel 8-6 ​​to rotate. The first pull wire 8-4 and the second pull wire 8-5 are both composed of an outer tube and an inner pull wire. The two ends of the inner pull wire of the first pull wire 8-4 are connected to the adjusting handwheel 8-3 and the pull wire adjusting wheel 8-6, respectively. The two ends of the outer tube of the first pull wire 8-4 are connected to the adjusting handwheel seat 8-1 and the pull wire fixing seat 8-2, respectively. The two ends of the inner pull wire of the second pull wire 8-5 are connected to the adjusting handwheel 8-3 and the pull wire adjusting wheel 8-6, respectively. The two ends of the outer tube of the second pull wire 8-5 are connected to the adjusting handwheel seat 8-1 and the pull wire fixing seat 8-2, respectively.

[0031] The connection points of the inner cable of the first pull cable 8-4 and the adjusting handwheel 8-3, and the connection points of the inner cable of the second pull cable 8-5 and the adjusting handwheel 8-3, are located on both sides of the adjusting handwheel 8-3. Similarly, the connection points of the inner cable of the first pull cable 8-4 and the cable adjusting wheel 8-6, and the connection points of the inner cable of the second pull cable 8-5 and the cable adjusting wheel 8-6, are located on both sides of the cable adjusting wheel 8-6. When the adjusting handwheel 8-3 rotates, the inner cable of the first pull cable 8-4 or the second pull cable 8-5 applies a tangential pulling force to the edge of the cable adjusting wheel 8-6, thereby generating torque on the cable adjusting wheel 8-6, driving the cable adjusting wheel 8-6 ​​to rotate, and thus driving the adjusting shaft 11 to rotate. The adjustment drive mechanism 8 uses the first pull cable 8-4 and the second pull cable 8-5 as power transmission components. The adjustment handwheel 8-3 can be arranged in a more easily accessible position on the seat, such as the side of the seat or under the armrest. The arrangement of the adjustment handwheel 8-3 is not constrained by transmission factors, making it more flexible and easier for the user to operate.

[0032] The first rotary adjustment component 6 is provided with two first compression bosses 6-1, and the second rotary adjustment component 7 is provided with two second compression bosses 7-1. The interval angle between the two first compression bosses 6-1 on the first rotary adjustment component 6 is 90 degrees, and the interval angle between the two second compression bosses 7-1 on the second rotary adjustment component 7 is 180 degrees.

[0033] The first adjustable spring assembly 4 and the second adjustable spring assembly 5 have different stiffness values.

[0034] like Figure 8 As shown, the adjustment actuator can be switched to three different states. When switched to state 1, the first compression boss 6-1 on the first rotary adjustment component 6 rotates to a state where it is offset from the end of the first adjustable spring assembly 4. At this time, the first adjustable spring assembly 4 reaches its maximum length (the compression amount reaches its minimum), and the elastic force exerted by the first adjustable spring assembly 4 on the rocker 2 is also minimal. The second compression boss 7-1 on the second rotary adjustment component 7 rotates to a state where it directly contacts the end of the second adjustable spring assembly 5. The second compression boss 7-1 forms the maximum compression amount on the second adjustable spring assembly 5, so that the length of the second adjustable spring assembly 5 reaches its minimum. At this time, the elastic force of the second adjustable spring assembly 5 on the rocker 2 reaches its maximum.

[0035] When switching to state 2, the first compression boss 6-1 on the first rotary adjustment component 6 rotates to directly contact the end of the first adjustable spring assembly 4, thereby forming the maximum compression on the first adjustable spring assembly 4, so that the length of the first adjustable spring assembly 4 reaches its minimum. At this time, the elastic force of the first adjustable spring assembly 4 on the rocker 2 reaches its maximum. At the same time, the second compression boss 7-1 on the second rotary adjustment component 7 rotates to a state that is offset from the end of the first adjustable spring assembly 4. At this time, the second adjustable spring assembly 5 reaches its maximum length (the compression reaches its minimum), and the elastic force applied by the second adjustable spring assembly 5 on the rocker 2 is also minimum.

[0036] When switching to state 3, the first compression boss 6-1 on the first rotary adjustment component 6 rotates to directly contact the end of the first adjustable spring assembly 4, thereby forming the maximum compression on the first adjustable spring assembly 4, minimizing the length of the first adjustable spring assembly 4. At this time, the elastic force of the first adjustable spring assembly 4 on the rocker 2 reaches its maximum. Simultaneously, the second compression boss 7-1 on the second rotary adjustment component 7 rotates to directly contact the end of the second adjustable spring assembly 5, thereby forming the maximum compression on the second adjustable spring assembly 5, minimizing the length of the second adjustable spring assembly 5. At this time, the elastic force of the second adjustable spring assembly 5 on the rocker 2 reaches its maximum. In this state, the overall elastic force applied to the rocker 2 by the first adjustable spring assembly 4 and the second adjustable spring assembly 5 reaches its maximum.

[0037] Furthermore, an indexing wheel 12 is provided on the adjusting shaft 11, and a guide hole is provided on the base 1. A pressing member 10 corresponding to the indexing wheel 12 is provided in the guide hole, and a pressing spring 14 is provided between the pressing member 10 and the base 1. Several positioning recesses that cooperate with the pressing member 10 are provided on the circumference of the indexing wheel 12. The positioning recesses on the circumference of the indexing wheel 12 cooperate with the pressing member 10. When the adjusting shaft 11 rotates to a specific angle (corresponding to a specific spring force), the pressing member 10 will be engaged in the positioning recesses under the action of the pressing spring 14 and produce a "click" sound. The user can perceive the gear shift through the change in resistance or the "click" sound, without relying on visual judgment, making the operation more intuitive.

[0038] The rocker 2 is provided with a rotating shaft 2-1 and a connecting shaft 2-2. The rocker 2 is rotatably connected to the base 1 through the rotating shaft 2-1. The connecting shaft 2-2 is used to connect the first adjustable spring assembly 4, the second adjustable spring assembly 5 and the main spring assembly 3.

[0039] This utility model is not limited to the above-described preferred embodiments. Anyone can derive other forms of products under the guidance of this utility model. However, regardless of any changes made in their shape or structure, any technical solution that is the same as or similar to this application falls within the protection scope of this utility model.

Claims

1. A cable-controlled spring adjustment mechanism for a seat, characterized in that, The device includes a base, a rocker arm rotatably connected to the base, a main spring assembly, a first adjustable spring assembly, and a second adjustable spring assembly. Both ends of the main spring assembly are connected to the rocker arm and the base, respectively. One end of each of the first and second adjustable spring assemblies is connected to the rocker arm. An adjustment shaft is rotatably connected to the base. The adjustment shaft has a first rotary adjustment component corresponding to the first adjustable spring assembly and a second rotary adjustment component corresponding to the second adjustable spring assembly. The adjustment shaft is connected to an adjustment drive mechanism, which drives the adjustment shaft to rotate, thereby changing the preload state of the first and second adjustable spring assemblies.

2. The cable-controlled spring adjustment mechanism for a seat according to claim 1, characterized in that, The base is provided with a guide member, and the guide member is provided with a guide groove corresponding to the first adjustable spring assembly and the second adjustable spring assembly; a sliding body is provided at the end of the first adjustable spring assembly near the first rotary adjustment component and at the end of the second adjustable spring assembly near the second rotary adjustment component; the sliding body is connected in the guide groove.

3. The cable-controlled spring adjustment mechanism for a seat according to claim 1, characterized in that, The adjustment drive mechanism includes an adjustment handwheel seat, an adjustment handwheel, a pull wire fixing seat, and a pull wire adjusting wheel. The adjustment handwheel is rotatably connected to the adjustment handwheel seat, and the pull wire adjusting wheel is connected to the rotating shaft. A first pull wire and a second pull wire are provided between the adjustment handwheel and the pull wire adjusting wheel. When the adjustment handwheel rotates, it drives the pull wire adjusting wheel to rotate.

4. The cable-controlled spring adjustment mechanism for a seat according to claim 3, characterized in that, Both the first and second pull wires consist of an outer tube and an inner pull wire. The two ends of the inner pull wire of the first pull wire are connected to the adjusting handwheel and the pull wire adjusting wheel, respectively, and the two ends of the outer tube of the first pull wire are connected to the adjusting handwheel seat and the pull wire fixing seat, respectively. The two ends of the inner pull wire of the second pull wire are connected to the adjusting handwheel and the pull wire adjusting wheel, respectively, and the two ends of the outer tube of the second pull wire are connected to the adjusting handwheel seat and the pull wire fixing seat, respectively.

5. The cable-controlled spring adjustment mechanism for a seat according to claim 1, characterized in that, The first rotary adjustment component is provided with two first compression bosses, and the second rotary adjustment component is provided with two second compression bosses.

6. The cable-controlled spring adjustment mechanism for a seat according to claim 5, characterized in that, The angle between the two first compression bosses is 90 degrees, and the angle between the two second compression bosses is 180 degrees.

7. The cable-controlled spring adjustment mechanism for a seat according to claim 1, characterized in that, The adjusting shaft is provided with an indexing wheel, the base is provided with a guide hole, the guide hole is provided with a pressing member corresponding to the indexing wheel, and a pressing spring is provided between the pressing member and the base; the indexing wheel is provided with a number of positioning recesses that cooperate with the pressing member in the circumferential direction.

8. The cable-controlled spring adjustment mechanism for a seat according to claim 1, characterized in that, The rocker is provided with a rotating shaft and a connecting shaft. The rocker is rotatably connected to the base through the rotating shaft. The connecting shaft is used to connect the first adjustable spring assembly, the second adjustable spring assembly, and the main spring assembly.

Images