A device capable of providing different levels of resistance

Abstract

The utility model discloses a device that can provide different elastic force, including at least two elastic force spare, adjacent elastic force spare series arrangement, be equipped with state switching assembly between, elastic force spare has work and static state, work time can follow device motion telescoping, state switching assembly has release and blocking state, release time both sides elastic force spare all work, when blocking, both sides are work and static state respectively, to this increase and decrease work state elastic force spare number, elastic force spare action direction is same and arranges along the same direction, through state switching assembly control its selective series connection, the more series connection, the smaller elasticity, on the contrary, the bigger elasticity, the device does not need long time to adjust elastic force spare pre -tension or pre -compression, and control state switching assembly can switch elasticity size in time, and the adjustment is convenient and efficient.

Description

Technical Field

[0001] This utility model relates to the field of furniture, and in particular to a device that can provide different elasticity. Background Technology

[0002] As living standards improve, people's demands for furniture are gradually increasing. The mobility of modern furniture is being emphasized, and the adjustment scheme of movable parts is a key design focus for many manufacturers. This inevitably involves adjusting the elasticity to meet specific needs. Mastering more effective and reasonable elasticity adjustment technology will allow manufacturers to capture a larger market share.

[0003] Taking chairs as an example, in existing chairs, backrest tilting has almost become an essential function, making it one of the core elements for improving user comfort. The elasticity adjustment performance during the tilting process directly affects the operating experience and safety of users of different weights. However, the existing chair backrest tilt elasticity adjustment schemes generally have the problem of cumbersome operation. It is necessary to adjust the initial compression of the spring little by little to adjust the initial preload and achieve the change in elasticity. For example, changing the spring preload by manually rotating the knob requires multiple rotations, which takes a long time and has low adjustment accuracy, and cannot quickly match the user's weight needs. Summary of the Invention

[0004] To address the aforementioned technical problems, this utility model provides a device capable of providing different elastic forces, comprising at least two elastic elements arranged in series with adjacent elastic elements connected in series and a state switching component between them; the elastic elements have working and stationary states, and can extend and retract with the movement of the device when working; the state switching component has release and blocking states, in which case both elastic elements are working when released, and in which the two sides are working and stationary respectively when blocked, thereby increasing or decreasing the number of elastic elements in the working state; the elastic elements act in the same direction and are arranged in the same direction, and their selective series connection is controlled by the state switching component, the more they are connected in series, the smaller the elastic force, and vice versa; this device does not require long-term adjustment of the pre-tightening force or pre-compression of the elastic elements, and the elastic force can be switched instantly by controlling the state switching component, making adjustment convenient and efficient.

[0005] The technical solution of this utility model is implemented as follows:

[0006] A device capable of providing different elastic forces includes at least two elastic elements, with each pair of adjacent elastic elements arranged in series, and a state switching component provided between each pair of adjacent elastic elements; the elastic elements have a working state and a stationary state, and when the elastic element is in the working state, it can extend and retract in response to the movement of the device, and when the elastic element is in the stationary state, it remains stationary; the state switching component has a released state and a blocking state, in the released state, the elastic elements on both sides of the state switching component are in the working state, and in the blocking state, the elastic elements on both sides of the state switching component are in the working state and the stationary state, respectively, and the state switching component is configured to increase or decrease the number of elastic elements in the working state.

[0007] The elastic components all act in the same direction and are arranged in the same direction. The series arrangement is not necessarily coaxial. Under the action of the state switching component, the elastic components will be selectively connected in series to change the elastic force. In the series state, the elastic force will be weakened. By changing the number of elastic components in the working state, different numbers of elastic components can be connected in series, thereby achieving different elastic force magnitudes. The more elastic components connected in series in the working state, the smaller the elastic force, and vice versa. In this solution, there is no need to adjust the pre-tightening force or pre-compression of the elastic components for a long time. The elastic force magnitude can be switched instantly by controlling the state switching component.

[0008] Preferably, all elastic components are arranged coaxially. Coaxial arrangement is a more volume-saving series arrangement method.

[0009] Preferably, the state switching component includes a follower and a state switching component. Two adjacent elastic components are arranged end-to-end, and each elastic component abuts against the follower. The state switching component is movably positioned beside the follower. When the state switching component slides to the side of the follower and abuts against it, the state switching component is in a blocking state. When the state switching component slides to allow the follower to slide, the state switching component is in a released state. When the follower slides under the action of the elastic components, the state switching component is in a released state, and the elastic components on both sides of the follower are in a working state, realizing the series connection of the elastic components. When the state switching component is in a blocking state, the follower is stationary, and only the elastic component on one side of the follower is in a working state.

[0010] Preferably, the state switching component is slidably disposed beside the follower, and the sliding direction of the state switching component is perpendicular to the sliding direction of the follower. The state switching component can also be rotated; when the state switching component avoids the follower, the state switching component is in a released state, and when the state switching component blocks the follower, the state switching component is in a blocking state.

[0011] Preferably, the follower has annular grooves on both ends of its face facing the elastic member. The ends of the elastic members are positioned in the annular grooves, ensuring stable installation, and the shorter distance between adjacent elastic members reduces the axial volume.

[0012] Preferably, the end face of the follower facing the state switching member has multiple stepped portions. The distance between the end face of the stepped portion and the state switching member is different, so that when the follower stops with a deviation, the state switching member can still abut against the follower to prevent it from sliding.

[0013] Preferably, all elastic components are springs.

[0014] Preferably, the elastic element located at the foremost or rearmost end is always in an active state. This ensures that the device is always movable and can always provide elastic force.

[0015] Preferably, the system also includes a transmission component and a control component. The number of control components is singular, and the number of transmission components is the same as the number of state-switching components. Each transmission component is connected to a respective state-switching component, and the transmission components are configured to drive the state-switching components to switch between a blocking state and a releasing state. The control component is connected to each transmission component and is configured to control the movement sequence of each transmission component. This allows for rapid changes in the state of the state-switching components, enabling quick alteration of the number of elastic components in the working state.

[0016] Preferably, the control component has a number of control slots equal to the number of transmission components. Each transmission component has two arms, one of which is positioned within a corresponding control slot, and the other is connected to a corresponding state switching component. The control slot has a stationary section and an active section. When the control component moves, the transmission component in the stationary section remains stationary, while the transmission component in the active section drives the state switching component to change its state. The sequence of transmission component movements is achieved through the structural configuration of different parts of the control slot, resulting in a simple and ingenious structure.

[0017] The design starting point, concept, and beneficial effects of this utility model, which adopts the above technical solution, are as follows:

[0018] The elastic components all act in the same direction and are arranged in the same direction. The series arrangement is not necessarily coaxial. Under the action of the state switching component, the elastic components will be selectively connected in series to change the elastic force. In the series state, the elastic force will be weakened. By changing the number of elastic components in the working state, different numbers of elastic components can be connected in series, thereby achieving different elastic force magnitudes. The more elastic components connected in series in the working state, the smaller the elastic force, and vice versa. In this solution, there is no need to adjust the pre-tightening force or pre-compression of the elastic components for a long time. The elastic force magnitude can be switched instantly by controlling the state switching component. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the seat using the device in an embodiment of the present invention. Figure 1 ;

[0020] Figure 2 This is a three-dimensional structural diagram of the seat using the device in an embodiment of the present invention. Figure 2 ;

[0021] Figure 3 This is a three-dimensional structural diagram of the device disposed between the base and the bottom shell in an embodiment of the present invention;

[0022] Figure 4 This is a three-dimensional structural diagram of the device in the embodiments of the present invention when all the additional elastic components are in the working state;

[0023] Figure 5 This is a cross-sectional view of the device in the embodiments of this utility model when all the additional elastic components are in the working state;

[0024] Figure 6 This is a three-dimensional structural diagram of the device in an embodiment where only the second additional component is in a stationary state.

[0025] Figure 7 This is a cross-sectional view of the device in an embodiment where only the second additional component is in a stationary state.

[0026] Figure 8 This is a three-dimensional structural diagram of the device in an embodiment where only the basic attachments are in working condition.

[0027] Figure 9 This is a cross-sectional view of the device in an embodiment where only the basic attachments are in the working state.

[0028] Figure 10 This is a three-dimensional structural diagram of the moving part in the embodiment of the present invention;

[0029] Figure 11 This is a three-dimensional structural diagram of the follower in the embodiments of this utility model;

[0030] Figure 12 This is a three-dimensional structural diagram of the state switching component in the embodiment of the present invention;

[0031] Figure 13 This is a three-dimensional structural diagram of the sleeve in the embodiment of the present invention;

[0032] Figure 14 This is a three-dimensional structural diagram of the present invention when all the follower components are blocked by the state switching component in the embodiments.

[0033] The reference numerals in the attached drawings are as follows: Device 100; Moving component 1; Limiting post 11; Extension shaft 12; Insertion hole 13; Sleeve 2; Circular groove 21; Slot 22; Basic elastic component 3; Additional elastic component 4; First additional elastic component 4a; Second additional elastic component 4b; Follower component 5; First follower component 5a; Second follower component 5b; Annular groove 8; Stepped portion 9; State switching component 6; First state switching component 6a; Second state switching component 6b; Clearance groove 15; First transmission component 1 6; Second transmission component 17; Support arm 18; Control component 19; First control groove 20; First stationary section 201; First active section 202; Second control groove 23; Second stationary section 231; Second active section 232; Long groove 24; Guide shaft 25; Pull cable 26; Protrusion 27; Backrest 200; Seat 300; Extension 301; Mounting groove 302; Mounting seat; 303; Restriction groove 304; Bottom shell 400; Boss 401; Round shaft 402. Detailed Implementation

[0034] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0035] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0036] In the description of this utility model, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] The specific embodiments of this utility model are as follows:

[0038] like Figure 14 As shown, this utility model provides a device 100 capable of providing different elastic forces, including at least two elastic elements, with each pair of adjacent elastic elements arranged in series, and a state switching component provided between each pair of adjacent elastic elements; the elastic elements have a working state and a stationary state, and when the elastic element is in the working state, it can extend and retract in response to the movement of the device, and when the elastic element is in the stationary state, it remains stationary; the state switching component has a releasing state and a blocking state, in the releasing state, the elastic elements on both sides of the state switching component are in the working state, and in the blocking state, the elastic elements on both sides of the state switching component are in the working state and the stationary state, respectively, and the state switching component is configured to increase or decrease the number of elastic elements in the working state.

[0039] The elastic components all act in the same direction and are arranged in the same direction. The series arrangement is not necessarily coaxial. Under the action of the state switching component, the elastic components will be selectively connected in series to change the elastic force. In the series state, the elastic force will be weakened. By changing the number of elastic components in the working state, different numbers of elastic components can be connected in series, thereby achieving different elastic force magnitudes. The more elastic components connected in series in the working state, the smaller the elastic force, and vice versa. In this solution, there is no need to adjust the pre-tightening force or pre-compression of the elastic components for a long time. The elastic force magnitude can be switched instantly by controlling the state switching component.

[0040] Specifically, the elastic element includes a basic elastic element 3 and at least one additional elastic element 4; the device also includes a moving element 1 and a sleeve 2, the basic elastic element 3 and the additional elastic element 4 are arranged in the same direction, and the moving element 1 and the sleeve 2 are relatively movable; a follower element 5 is provided between the basic elastic element 3 and the additional elastic element 4, the basic elastic element 3 is located between the moving element 1 and the follower element 5, and the additional elastic element 4 is located between the follower element 5 and the sleeve 2, the follower element 5 is configured to selectively move or remain stationary relative to the sleeve 2; when the follower element 5 and the sleeve 2 are relatively stationary, only the basic elastic element 3 deforms in response to the movement of the moving element 1 and the sleeve 2; when the follower element 5 and the sleeve 2 move relative to each other, both the basic elastic element 3 and the additional elastic element 4 can deform in response to the movement of the moving element 1 and the sleeve 2.

[0041] First, the basic elastic component 3 is always in working condition in the device, which is the elastic foundation of the device and ensures that the device can always provide elastic force. The additional elastic component 4 can switch between working and stationary states under the action of the follower 5. That is, when the follower 5 moves relative to the sleeve 2, the two elastic components are in a linked state, and the additional elastic component 4 can deform together with the basic elastic component 3. At this time, the elastic force that the device can provide is smaller. When the follower 5 is stationary relative to the sleeve 2, the additional elastic component 4 and the basic elastic component 3 are separated by the follower 5. The additional elastic component 4 is stationary and no longer provides elastic force. The elastic force is only provided by the basic elastic component 3. At this time, the elastic force provided by the basic elastic component 3 is greater.

[0042] In addition, in this solution, the device 100 is modularized so that the moving part 1 and the sleeve 2 are respectively connected to the movable and fixed parts of the furniture that need to be adjusted. When the movable part moves, it provides elasticity and can make quick elasticity adjustment, resulting in better functional adaptability.

[0043] In this design, the elasticity is determined not by the sum of the elastic components, but by whether they are in series. Components in series provide less elasticity. With the same compression (i.e., the relative movement of moving part 1 and sleeve 2) and elasticity coefficient, the elasticity provided by the basic elastic component 3 alone is twice that of the basic elastic component 3 and the additional elastic component 4 working together. Based on this, the elasticity levels are determined according to the applicable range (e.g., the user's weight range). The number of additional elastic components 4 can be selected based on the actual situation. The highest elasticity level is when only the basic elastic component 3 is active; the second highest is when two elastic components are in series; the third highest is when three elastic components are in series, and so on. Whether the additional elastic components 4 are in series is determined by the movement of the follower component 5. Adjustment only requires controlling the state of the follower component 5, making elasticity adjustment simple and quick.

[0044] To achieve the above effect and connect the elastic components in series, the elastic components need to be arranged in the same direction, rather than arranged side by side with intervals. For example, when the relative movement direction of the moving part 1 and the sleeve 2 is the front-back direction, the elastic components are all arranged in the front-back direction, rather than arranged side by side with intervals.

[0045] like Figure 1-3 As shown, the device is applied to a seat, which includes a backrest 200, a seat 300, a base shell 400, and the device 100 as described above. The backrest 200 is rotatably mounted on the base shell 400, and the seat 300 is slidably mounted on the base shell 400 and linked with the backrest 200. The device 100 is disposed between the seat 300 and the base shell 400 in the front-back direction. The moving part 1 is connected to the seat 300, and the sleeve 2 is connected to the base shell 400. When the backrest 200 tilts backward, the seat 300 slides forward on the base shell 400 and moves the moving part 1 closer to the sleeve 2.

[0046] When applied to a seat, this device provides cushioning elasticity when the backrest 200 tilts backward and provides auxiliary restoring force when the backrest 200 rotates forward to return to an upright position. The device can also quickly adjust the elasticity based on the user's weight. It is modular and can be applied to different seats. When the elastic element is in action, it can either compress or extend. In this design, when the backrest 200 tilts backward, the seat 300 moves forward, and the elastic element compresses to provide elasticity. During the process of the backrest 200 returning to an upright position, although the elastic element extends, it also assists the seat 300 to move backward and the backrest 200 to return to an upright position by compressing the stored elasticity.

[0047] Specifically, such as Figure 4 , 5As shown in Figures 10-13, the bottom shell 400 has upwardly extending protrusions 401 at both ends, and the backrest 200 is rotatably connected to the protrusions 401; the seat 300 has an upwardly extending extension 301, and the backrest 200 is rotatably connected to the extension 301, so that when the backrest 200 tilts backward, it drives the seat 300 to slide forward on the bottom shell 400, and when the backrest 200 tilts forward, it drives the seat 300 to slide backward on the bottom shell 400; the seat 300 is provided with rectangular mounting grooves 302 arranged front and back. The device is inserted into the mounting groove 302 and positioned along the front-to-back direction. The rear end of the mounting groove 302 is provided with a recessed mounting seat 303. A limiting groove 304 is provided on the mounting seat 303. The moving part 1 is block-shaped, and the left and right end faces of the moving part 1 are provided with limiting posts 11. When the device is installed into the mounting groove 302, the limiting posts 11 enter the limiting groove 304. The upper part of the limiting groove 304 extends vertically from top to bottom, and the lower part slopes backward from top to bottom. Under the action of the elastic force of the device itself, the limiting posts 11 are located at the lower end of the limiting groove 304 and are not easy to detach from it.

[0048] The sleeve 2 has a circular groove 21 at its front end, and the bottom shell 400 has a circular shaft 402 arranged in the left-right direction at its front. The circular shaft 402 abuts against the circular groove 21. While the device is in the telescopic movement, it is given adaptive rotation to prevent interference. The seat 300 and the bottom shell 400 each have a device 100 on their left and right sides. If there is only one device 100, it can be set in the middle. However, in this embodiment, devices 100 are set on both the left and right sides to maintain uniform and stable force.

[0049] Furthermore, there are two additional elastic components 4, namely the first additional elastic component 4a and the second additional elastic component 4b. Both elastic components are springs. In addition to common telescopic springs, bent spring plates can also be used as elastic components. Both additional elastic components 4 are set in the sleeve 2. There are also two corresponding follower components 5, namely the first follower component 5a and the second follower component 5b. Both follower components 5 are set in the sleeve 2, while the basic elastic component 3 is exposed outside the sleeve 2 and is located between the moving component 1 and the sleeve 2. Corresponding to the two follower components 5, there are also two state switching components 6 in the sleeve 2, namely the first state switching component 6a and the second state switching component 6b. The follower components 5 and the additional elastic components 4 are arranged along the axial direction of the sleeve 2, and the state switching components 6 are arranged in a radial direction along the sleeve. The sleeve 2 is a sleeve, which gives it a accommodating function, allowing the additional elastic components 4, follower components 5, state switching components 6, etc. to be stably installed. The sliding direction of the state switching component is perpendicular to that of the follower component.

[0050] The sleeve 2 has two slots 22 spaced apart, corresponding to the two state switching elements 6. The two slots 22 are arranged radially along the sleeve 2 and extend into the interior of the sleeve 2. The state switching elements 6 are slidably disposed in the slots 22. The end of the follower 5 is located beside the slot 22. The state switching elements 6 are disposed beside the follower 5 along the movement direction of the moving element 1 and the sleeve 2. The state switching elements 6 enter or leave the interior of the sleeve through the slots 22 to block or avoid the follower 5. When the state switching elements 6 slide between the follower 5 and the sleeve 2, the state switching elements 6 block the follower 5, and the follower 5 and the sleeve 2 remain relatively stationary. When the state switching elements 6 slide... When the follower moves away from the space between the follower 5 and the sleeve 2, the state switching component 6 releases the follower 5, and the follower 5 moves relative to the sleeve 2. The movement and stillness of the follower 5 are controlled by the state switching component 6, which is simple and quick to operate. When the follower 5 moves, the series connection between the additional elastic component 4 and the basic elastic component 3 takes effect. When the follower 5 is still, the series connection between the additional elastic component 4 and the basic elastic component 3 fails, and the additional elastic component 4 no longer functions. The state switching component 6 is provided with a clearance groove 15 for avoiding the additional elastic component 4. The existence of the clearance groove 15 can prevent the state switching component 6 from affecting the elastic component. The shape of the state switching component 6 can be U-shaped.

[0051] like Figure 14As shown, the basic elastic element 3 and the additional elastic element 4 are coaxially arranged; coaxial arrangement is a more volume-saving series arrangement; the second additional elastic element 4b is closer to the sleeve 2 than the first additional elastic element 4a; the follower 5 between the basic elastic element 3 and the first additional elastic element 4a is the first follower 5a, and the follower 5 between the first additional elastic element 4a and the second additional elastic element 4b is the second follower 5b. The first state switching element 6a is provided next to the first follower 5a, and the second state switching element 6a is provided next to the second follower 5b. Replacement component 6b, first state switching component 6a is located between first follower component 5a and second follower component 5b, second state switching component 6b is located between second follower component 5b and sleeve 2; both ends of follower component 5 are provided with annular grooves 8 for accommodating the ends of springs; in this embodiment, the elastic component works by compression, the ends of the basic elastic component 3 and the additional elastic component 4 are both set in the annular grooves 8 and abut against the follower component 5, in addition, when the elastic component works by extension, the ends of the elastic component also need to be locked in the annular grooves 8 to prevent them from disengaging; also on moving component 1 An annular groove 8 is provided. Specifically, the front end of the basic elastic member 3 is located in the annular groove 8 on the rear end face of the first follower 5a and abuts against the first follower 5a; the rear end of the basic elastic member 3 is located in the annular groove 8 on the moving member 1 and abuts against the moving member 1; the rear end of the first additional elastic member 4a is located in the annular groove 8 on the front end face of the first follower 5a and abuts against the first follower 5a; the front end of the first additional elastic member 4a is located in the annular groove 8 on the rear end face of the second follower 5b and abuts against the second follower 5b; the rear end of the second additional elastic member 4b is located in the annular groove 8 on the rear end face of the second follower 5b. The follower 5b is in the annular groove 8 on the front end face and abuts against the second follower 5b. The front end of the second additional elastic member 4b abuts against the sleeve 2. Therefore, the basic elastic member 3, the first additional elastic member 4a, and the second additional elastic member 4b are arranged coaxially with their ends adjacent to each other, and can selectively realize the series connection of springs. Furthermore, the two slots 22 are located in front of the first follower 5a and the second follower 5b, respectively. That is, the first state switching member 6a is located in front of the first follower 5a, and the second state switching member 6b is located in front of the first follower 5a.

[0052] A guide shaft 25 is provided between the moving part 1 and the sleeve 2. The guide shaft 25 is arranged along the movement direction of the moving part 1 and the sleeve 2, that is, along the front-back direction. The first follower 5a and the second follower 5b are slidably sleeved on the guide shaft 25. The basic elastic member 3, the first additional elastic member 4a, and the second additional elastic member 4b are all sleeved outside the guide shaft 25. In addition, the outer surfaces of the first follower 5a and the second follower 5b are also slidably engaged with the inner surface of the sleeve 2. The guide shaft 25 is inserted into the moving part 1. When the moving part 1 and the sleeve 2 move, the moving part 1 slides on the guide shaft 25. The presence of the guide shaft 25 can increase the stability of the device during movement. Furthermore, the moving part 1 has a hollow extension shaft 12 extending forward from the center of its annular groove 8. The extension shaft 12 has a through insertion hole 13. The guide shaft 25 is disposed in the insertion hole 13. When the moving part 1 moves close to the sleeve 2, the guide shaft 25 selectively extends out of the moving part 1 through the insertion hole 13.

[0053] like Figure 11 , 12 As shown, although the follower 5 can maintain a roughly stable position under the action of the two elastic members, there may still be deviations. Therefore, the end of the follower 5 near the state switching member 6 is provided with several stepped portions 9. The state switching member 6 abuts against any of the stepped portions 9 to block the follower 5. When the state switching member 6 blocks the follower 5, the position of the follower 5 may be deviated. If there were no stepped portions 9, the state switching member 6 would not be able to block the follower 5 when its position is deviated. However, the stepped portions 9 can provide multiple compensations, so that when the follower 5 has different deviations, the state switching member 6 can still abut against different stepped portions 9 to block the follower. Component 5; simultaneously, two elastic transmission components are rotatably provided on the sleeve 2, namely the first transmission component 16 and the second transmission component 17, which are used to control the sliding of the first state switching component 6a and the second state switching component 6b, respectively; the transmission components are elastic and adapt to the stepped portion 9, so that the state switching component 6 can be easily engaged and abutted; the stepped portion 9 has different degrees of protrusion toward the state switching component 6, and the state switching component 6 may not be able to fully enter the sleeve 2 when it abuts with the stepped portion 9, so the elastic transmission component needs to be able to adapt to the protrusion of the stepped portion 9, so that the stroke of the transmission component controlling the sliding of the state switching component 6 is not fixed, so as to prevent interference when the state switching component 6 enters.

[0054] Since there are more than two additional elastic components 4, there are sequential requirements for switching the working and stationary states of the additional elastic components 4 in order to achieve changes between multiple elastic gears: The sleeve 2 is provided with a sliding control component 19, which is connected to the first transmission component 16 and the second transmission component 17. The first transmission component 16 is connected to the first state switching component 6a, and the second transmission component 17 is connected to the second state switching component 6b. When the control component 19 slides to switch the first follower component 5a and the second follower component 5b to a stationary state relative to the sleeve 2, the first state switching component 6a preferentially blocks the second follower component 5b. When the control component 19 slides to switch the first follower component 5a and the second follower component 5b to a moving state relative to the sleeve 2, the first state switching component 6a preferentially avoids the first follower component 5a. With more additional elastic components 4, the device can form more gears, but when there are more than two additional elastic components 4, the sequence of state switching of the follower component 5 also needs to be considered. In this scheme, the basic elastic component 3, the first additional elastic component 4a, and the first additional elastic component 4a are... The second additional elastic element 4b is arranged accordingly. The basic elastic element 3 is always in the working state, and only when it is in the working state is it in the first gear, and the first gear can provide the maximum elastic force. Therefore, when the basic elastic element 3 and its adjacent second additional elastic element 4b are in the working state, it is in the second gear, and when all three are in the working state, it is in the third gear. Therefore, the state switching sequence of the follower 5 achieved by the control element 19, the first transmission element 16, and the second transmission element 17 should be as follows: when gradually reducing the elastic force, the first transmission element 16 releases the force first. Release the first follower 5a, and then release the second follower 5b by the second transmission member 17. Conversely, when gradually increasing the elastic force, the second transmission member 17 first blocks the second follower 5b, and then the first transmission member 16 blocks the first follower 5a. In summary, when reducing the elastic force, the sequence of releasing the follower 5 should start from the one closest to the base elastic member 3 and gradually unlock the follower 5 that is further away. When increasing the elastic force, the sequence of blocking the follower 5 should start from the one furthest from the base elastic member 3 and gradually lock the follower 5 that is closer.

[0055] In this example, the control component 19 is slidably disposed on the lower surface of the sleeve 2. A protruding strip 27 protrudes downwards from the lower surface of the sleeve 2. The control component 19 is plate-shaped with a corresponding elongated groove 24. The control component 19 is mounted on the sleeve 2 using screws and washers, so that the protruding strip 27 is located in the elongated groove 24. The position of the protruding strip 27 in the elongated groove 24 changes when the control component 19 slides. The control component 19 has a first control groove 20 and a second control groove 23. A first transmission component 16 is disposed in the first control groove 20, and a second transmission component 16 is disposed in the second control groove 23. Component 17 is disposed in the second control groove 23. The first control groove 20 and the second control groove 23 are configured to control the movement sequence of the first transmission component 16 and the second transmission component 17. Specifically, the first transmission component 16 and the second transmission component 17 are rotatably disposed on the sleeve 2. The first control groove 20 has a first stationary section 201 with the same movement direction as the moving component 1 and the sleeve 2, and a first active section 202 inclined relative to the first stationary section 201. Correspondingly, the second control groove 23 has a second stationary section 231 and a second active section 202. The first stationary segment 201 is closer to the moving part 1 relative to the first working end, and the second stationary segment 231 is farther away from the moving part 1 relative to the second working segment 232. In this example, the first control groove 20 is located behind the second control groove 23, the first stationary segment 201 is arranged in the front-back direction and is located behind the first working segment 202, and the first working segment 202 is inclined from back to front and inward. The second stationary segment 231 is located in front of the second working segment 232, and the second working segment 232 is also inclined from back to front and inward. The positions of the first stationary segment 201 and the second stationary segment 231 are different in the left-right direction. The second stationary segment 231 is located inside the first stationary segment 201 in the left-right direction, while the first working segment 202 and the second working segment 232 are almost the same. When the control member 19 slides, the transmission member located in the stationary segment remains stationary, while the transmission member located in the working segment will rotate, thereby controlling the corresponding state switching member 6 to slide. The preset motion sequence is realized through structural design, that is, the sequence of control of the follower 5 is realized. The structure is simple and ingenious.

[0056] like Figure 3-14As shown, the control component 19 is connected to a pull cable 26, which is configured to drive the control component 19 to move. An elastic reset component is also provided between the control component 19 and the sleeve 2. The elastic reset component is configured to provide an elastic reset force to the control component 19 in the opposite direction to the direction in which the pull cable 26 drives the control component 19. In this design, the pull cable 26 also has three positions, corresponding to locking both the first follower 5a and the second follower 5b, unlocking the first follower 5a and locking the second follower 5b, and locking the first follower 5a and the second follower 5b respectively. All follower components 5b are unlocked; more specifically, the transmission component is a torsion spring with two arms 18. One arm 18 is inserted into the state switching component 6 to control the sliding of the state switching component 6, and the other arm 18 is inserted into the control slot to generate rotation in response to the sliding of the control component 19. When the control component 19 is at its foremost position, the arms 18 of the first transmission component 16 and the second transmission component 17 are in the same position in the left-right direction, and the arm 18 of the first transmission component 16 is located at the rear end of the first stationary section 201. The support arm 18 of the second transmission component 17 is located at the rear end of the second action section 232. At this time, neither the first state switching component 6a nor the second state switching component 6b obstructs the first follower component 5a and the second follower component 5b. The first additional elastic component 4a and the second additional elastic component 4b are both in working state. The three elastic components are connected in series, and the elastic force is minimal. This is the first gear of the pull cable 26. When the pull cable 26 drives the control component 19 to slide backward, the support arm 18 of the first transmission component 16 moves in the first stationary section 201. One transmission member 16 remains stationary, while the support arm 18 of the second transmission member 17 moves within the second action section 232 and rotates due to tilting. The second transmission member 17 pushes the second state switching member 6b inward. When the support arm 18 of the first transmission member 16 is located at the front end of the first stationary section 201 and the rear end of the first action section 202, and the support arm 18 of the second transmission member 17 is located at the front end of the second action section 232 and the rear end of the second stationary section 231, the second state switching member 6b... Located inside the sleeve 2 and blocking the second follower 5b, the first state switching member 6a still does not block the first follower 5a. At this time, the second additional elastic member 4b switches to the stationary state, and only the basic elastic member 3 is connected in series with the first additional elastic member 4a, and the elastic force increases. At this time, it is the second gear of the pull cable 24. When the pull cable 24 drives the control member 19 to slide further backward, the support arm 18 of the first transmission member 16 moves in the first action section 202, causing the first transmission member 16 to rotate and drive the first state switching member 6a to slide inward, while the support arm 18 of the second transmission member 17 moves in the second stationary section 211, keeping the second state switching member 6b blocking the second follower 5b.When the control component 19 slides to its rearmost position, and the support arm 18 of the first transmission component 16 is at the front end of the first active section 202, and the support arm 18 of the second transmission component 17 is at the front end of the second stationary section 211, both the first state switching component 6a and the second state switching component 6b are located inside the sleeve 2. The first state switching component 6a blocks the first follower component 5a, causing the first additional elastic component 4a to also switch to the stationary state. Only the basic elastic component 3 is in the working state, with the elastic force at its maximum. This is the third gear of the pull cable 24.

[0057] Another advantage of using a torsion spring as the transmission component is that it can achieve delayed locking. When the slider 5 is affected by the elastic components on both sides, causing it to be positioned in the second component 2 to block the slot 22, the blocking component 6 cannot enter the second component 2, and the support arm 18 connected to it cannot move. However, the control component 19 can still drive the support arm 18 located in the control slot to move, causing the transmission component to accumulate elastic force. When the slider 5 slides to the point where it no longer blocks the slot 22, the transmission component releases the elastic force to drive the blocking component 6 into the second component 2 and block the slider 5.

[0058] Another advantage of using a torsion spring as the transmission component is that it can achieve delayed locking. When the follower 5 is affected by the elastic components on both sides, causing it to be positioned in the sleeve 2 to block the slot 22, the state switching component 6 cannot enter the sleeve 2, and the support arm 18 connected to it cannot move. However, the control component 19 can still drive the support arm 18 located in the control slot to move, causing the transmission component to accumulate elastic force. When the follower 5 slides to no longer block the slot 22, the transmission component releases the elastic force to drive the state switching component 6 into the sleeve 2 and block the follower 5.

[0059] Even with more additional elastic components 4, the working and stationary states of each additional elastic component 4 can be switched sequentially through the adaptive design of the control slots. For example, the control slots of the first and last gears are only two-sectioned, namely the working section and the stationary section, while the control slots of the middle gears are three-sectioned, namely the stationary, working and stationary sections. The only difference is the position of the working section. The control sequence can be determined according to the position of the working section.

Claims

1. A device capable of providing different elastic forces, characterized in that: It includes at least two elastic elements, with each pair of adjacent elastic elements arranged in series, and a state switching component provided between each pair of adjacent elastic elements; the elastic elements have a working state and a stationary state, and when the elastic element is in the working state, it can extend and retract in response to the movement of the device, and when the elastic element is in the stationary state, it remains stationary; the state switching component has a releasing state and a blocking state, and when the elastic element is in the releasing state, the elastic elements on both sides of the state switching component are in the working state and the stationary state, respectively, and the state switching component is configured to increase or decrease the number of elastic elements in the working state.

2. The device capable of providing different elastic forces according to claim 1, characterized in that: All elastic components are arranged coaxially.

3. The device capable of providing different elastic forces according to claim 1, characterized in that: The state switching component includes a follower and a state switching component. Two adjacent elastic components are arranged end to end, and the two elastic components abut against the follower respectively. The state switching component is movably disposed next to the follower. When the state switching component slides to the side of the follower and abuts against the follower, the state switching component is in a blocking state. When the state switching component slides to the point that the follower can slide, the state switching component is in a releasing state.

4. The device capable of providing different elastic forces according to claim 3, characterized in that: The state switching component is slidably positioned next to the follower, and the sliding direction of the state switching component is perpendicular to the sliding direction of the follower.

5. The device capable of providing different elastic forces according to claim 3, characterized in that: Both ends of the follower facing the elastic member are provided with annular grooves.

6. The device capable of providing different elastic forces according to claim 3, characterized in that: The end face of the follower facing the state switching component has multiple stepped sections.

7. The device capable of providing different elastic forces according to claim 1, characterized in that: All elastic components are springs.

8. The device capable of providing different elastic forces according to claim 1, characterized in that: The elastic components located at the front or rear end are always in working condition.

9. The device capable of providing different elastic forces according to claim 1, characterized in that: It also includes transmission components and control components. The number of control components is one, and the number of transmission components is the same as the number of state switching components. Each transmission component is connected to a state switching component. The transmission components are configured to drive the state switching components to switch between blocking and releasing states. The control components are connected to each transmission component and are configured to control the movement sequence of each transmission component.

10. The device capable of providing different elastic forces according to claim 9, characterized in that: The control component has a number of control slots equal to the number of transmission components. The transmission component has two arms, one of which is set in the corresponding control slot, and the other arm is connected to the corresponding state switching component. The control slot has a stationary section and an active section. When the control component moves, the transmission component in the stationary section remains stationary, and the transmission component in the active section drives the state switching component to switch states.

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