Adjusting device for chair back force feedback

Abstract

The utility model provides a chair back force feedback adjusting device. The chair back force feedback adjusting device comprises a base and a moving seat which are spaced front and back, the base is provided with a first telescopic rod and a second telescopic rod which are inserted into the moving seat and are in sliding connection. The first telescopic rod and the second telescopic rod are sleeved with a first elastic piece and a second elastic piece respectively, the moving seat is provided with a sliding groove and a switching groove, the sliding groove is provided with a sliding piece and sleeved on the second telescopic rod, and the two ends of the second elastic piece abut against the base and the sliding piece respectively. And a state switching piece is arranged in the switching groove. When the state switching piece leaves the sliding groove, the moving seat slides, only the first elastic piece acts to provide basic elastic force, first-gear force feedback is achieved, and the device is suitable for the light-weight person. The state switching piece slides into the sliding groove to abut against the sliding piece, the moving base slides to compress the second elastic piece, the two elastic pieces act together, a second gear with larger force feedback is achieved, and the device is suitable for a person with weight.

Description

Technical Field

[0001] This utility model relates to the field of furniture, and in particular to an adjustment device for backrest force feedback. Background Technology

[0002] In modern office and living settings, chairs are used extremely frequently, with people sitting for long periods of time for work, study, and entertainment. A high-quality chair not only needs to be ergonomic, but the support and feedback of the backrest are also crucial. Traditional chairs mostly have fixed backrests or only simple angle adjustment functions, failing to provide appropriate reclining resistance based on the user's weight.

[0003] Lighter users often find it difficult to adjust to a comfortable reclining angle when leaning back due to excessive resistance, which can easily lead to muscle fatigue over time. Heavier users, on the other hand, may find the backrest lacking support, with insufficient cushioning and rebound when reclining, affecting posture stability and comfort. While some adjustable backrest devices exist on the market, their complex structures, high costs, and inflexible adjustment methods hinder widespread adoption. Therefore, it is essential to develop a sophisticated backrest force feedback adjustment device that can flexibly switch between different force feedback levels to meet the needs of people with varying weights. Summary of the Invention

[0004] To address the aforementioned technical problems, this utility model provides an adjustment device for backrest force feedback, comprising a base and a moving seat spaced apart front and rear. The base has first and second telescopic rods inserted into the moving seat, slidably connected. The first and second telescopic rods are respectively fitted with first and second elastic elements. The moving seat has a sliding groove and a switching groove. The sliding groove has a sliding element fitted onto the second telescopic rod, with the two ends of the second elastic element abutting against the base and the sliding element, respectively. A state switching element is located within the switching groove. When the state switching element is removed from the sliding groove, the moving seat slides, and only the first elastic element is active, providing basic elasticity and achieving the first level of force feedback, suitable for lighter users. When the state switching element slides into the sliding groove and abuts against the sliding element, the sliding of the moving seat compresses the second elastic element, and the combined action of the two elastic elements achieves a second level of greater force feedback, suitable for heavier users.

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

[0006] A backrest force feedback adjustment device includes a base and a motion seat, which are spaced apart front to back. A first telescopic rod and a second telescopic rod are mounted on the base and inserted into the motion seat. The motion seat is slidably mounted on the first and second telescopic rods. A first elastic element and a second elastic element are respectively sleeved on the first and second telescopic rods. The two ends of the first elastic element abut against the base and the motion seat, respectively, and are configured to provide elastic force to the motion seat when it slides towards the base. A sliding groove is formed on the motion seat, and a sliding element is provided within the groove. The sliding element is sleeved on the second telescopic rod, and the two ends of the second elastic element abut against the base and the sliding element, respectively. The motion seat also has a switching groove that communicates with the sliding groove. A state switching element is slidably mounted within the switching groove. The state switching element is configured such that when it slides into the groove and the motion seat slides towards the base, the second elastic element provides elastic force to the motion seat; when it slides out of the groove and the motion seat slides towards the base, the sliding element slides within the groove.

[0007] When the state switching element slides out of the groove, the sliding element is not limited in the groove. When the motion seat slides towards the base, the sliding element will also slide relative to the motion seat in the groove. At this time, the second elastic element will not act on the motion seat, while the first elastic element will always act on the motion seat, providing it with the most basic elastic force to achieve the first level of force feedback. Under the first level of force feedback, it can be adapted to lighter users. When the state switching element slides into the groove and abuts against the sliding element, the sliding element can no longer slide in the groove. When the motion seat slides towards the base, it will slide together with the motion seat on the second telescopic rod. At this time, the sliding element will compress the second elastic element, so that both the first and second elastic elements act on the motion seat to achieve the second level of force feedback. The two elastic elements can provide greater force feedback, adapting to heavier users.

[0008] Preferably, the motion seat includes an integrally formed first connecting part and a second connecting part. The first connecting part has a through slot extending from front to back, into which a first telescopic rod is inserted, and a first elastic element abuts against the first connecting part. The sliding groove is formed on the second connecting part and extends in the front-back direction, while the switching groove extends in the left-right direction from the first connecting part to the second connecting part, with the switching groove located beside the middle of the sliding groove. The left and right connecting parts of the motion seat are slidably mounted on the two telescopic rods and have different structures for different functional requirements. The first connecting part only needs to have a slot to directly insert into the first telescopic rod and allow the first elastic element to act on it. The second connecting part, however, needs to have a sliding groove corresponding to the sliding element, and a switching groove is set beside the middle of the sliding groove for selective positioning of the sliding element. The switching groove is directly set between the first and second connecting parts, eliminating the need for protruding parts on the motion seat, resulting in a more compact structure, reduced space occupation, and a more regular and compact overall design, facilitating installation.

[0009] Preferably, the second connecting portion includes a sleeve portion that protrudes forward from the first connecting portion. The sleeve portion increases the length of the second connecting member to accommodate the sliding length of the slider.

[0010] Preferably, the state switching component is plate-shaped, with a first clearance groove for avoiding the slot and a second clearance groove for avoiding the second telescopic rod. The state switching component is positioned between the two telescopic rods, reducing the overall volume, but also requiring the corresponding clearance grooves to avoid the telescopic rods.

[0011] Preferably, the length of the first elastic member is greater than the length of the second elastic member. To achieve a more compact overall structure and smaller volume, the arrangement of having the first elastic member longer than the second elastic member complements the arrangement of having the second connecting part longer than the first connecting part.

[0012] Preferably, both the first elastic element and the second elastic element are compression springs.

[0013] Preferably, a transmission component is rotatably mounted on the motion seat. The motion seat has a window shared with the switching slot. The transmission component is connected to the state switching component through the window. The transmission component is configured such that when it rotates, it drives the state switching component to slide left and right in the switching slot. This achieves control over the state switching component.

[0014] Preferably, the transmission component is a torsion spring. It is elastic, and after the transmission component rotates, it can wait until the sliding component returns to the sleeve before delaying the entry of the drive state switching component into the groove to abut against the sliding component.

[0015] Preferably, the second telescopic rod is provided with a limiting ring, which is located in the sliding member. The limiting ring is configured to prevent the sliding member from moving away from the second elastic member. Under the action of the limiting ring, the sliding member can maintain its relative position with the second elastic member when the motion seat slides, and will not separate from the second elastic member. This allows the state switching member to smoothly abut against the sliding member and enable the second elastic member to output force feedback, ensuring the normal realization of the function.

[0016] Preferably, the slider is provided with a raised rib. The raised rib is configured to prevent the slider from rotating in the groove and to increase the contact area between the slider and the state switching component. The raised rib achieves two goals at once, making the operation more stable.

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

[0018] When the state switching element slides out of the groove, the sliding element is not limited in the groove. When the motion seat slides towards the base, the sliding element will also slide relative to the motion seat in the groove. At this time, the second elastic element will not act on the motion seat, while the first elastic element will always act on the motion seat, providing it with the most basic elastic force to achieve the first level of force feedback. Under the first level of force feedback, it can be adapted to lighter users. When the state switching element slides into the groove and abuts against the sliding element, the sliding element can no longer slide in the groove. When the motion seat slides towards the base, it will slide together with the motion seat on the second telescopic rod. At this time, the sliding element will compress the second elastic element, so that both the first and second elastic elements act on the motion seat to achieve the second level of force feedback. The two elastic elements can provide greater force feedback, adapting to heavier users. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of the chassis in the embodiments of this utility model. Figure 1 ;

[0020] Figure 2 This is a schematic diagram of the three-dimensional structure of the chassis in the embodiments of this utility model. Figure 2 ;

[0021] Figure 3 This is a three-dimensional structural diagram of the device in an embodiment of the present invention. Figure 1 ;

[0022] Figure 4 This is a three-dimensional structural diagram of the device in an embodiment of the present invention. Figure 2 ;

[0023] Figure 5 This is a cross-sectional view of the device in an embodiment of the present invention;

[0024] Figure 6 This is a three-dimensional structural diagram of the sliding member and the state switching member relative to the first telescopic rod and the second telescopic rod in an embodiment of the present invention;

[0025] Figure 7 This is a three-dimensional structural diagram of the motion seat in an embodiment of the present invention;

[0026] Figure 8 This is a cross-sectional view of the motion seat in an embodiment of the present invention;

[0027] Figure 9 This is a three-dimensional structural diagram of the second telescopic rod with a limiting ring in an embodiment of the present invention;

[0028] Figure 10 This is a three-dimensional structural diagram of the state switching component in an embodiment of the present invention.

[0029] The reference numerals in the attached drawings are as follows: base 1; moving seat 2; first connecting part 21; second connecting part 22; sleeve part 221; first telescopic rod 3; second telescopic rod 4; first elastic element 5; second elastic element 6; sliding groove 7; sliding element 8; switching groove 9; state switching element 10; slot 11; first clearance groove 12; second clearance groove 13; transmission element 14; window 15; limiting ring 16; clearance hole 17; protrusion 18; bottom shell 19; armrest seat 20; seat connector 23. Detailed Implementation

[0030] 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.

[0031] 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.

[0032] 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.

[0033] The specific implementation of this utility model is as follows:

[0034] like Figure 1-6 As shown, this utility model provides a backrest force feedback adjustment device, including a base 1 and a motion seat 2. The base 1 and the motion seat 2 are spaced apart. The base 1 is provided with a first telescopic rod 3 and a second telescopic rod 4, which are inserted into the motion seat 2. The motion seat 2 is slidably arranged with the first telescopic rod 3 and the second telescopic rod 4. A first elastic element 5 and a second elastic element 6 are respectively sleeved on the first telescopic rod 3 and the second telescopic rod 4. The two ends of the first elastic element 5 abut against the base 1 and the motion seat 2 respectively, and are configured such that when the motion seat 2 slides toward the base 1, the first elastic element 5 provides elasticity to the motion seat 2. Force; The motion seat 2 is provided with a sliding groove 7, and a sliding member 8 is provided in the sliding groove 7. The sliding member 8 is sleeved on the second telescopic rod 4. The two ends of the second elastic member 6 abut against the base 1 and the sliding member 8 respectively; The motion seat 2 is also provided with a switching groove 9, which is connected to the sliding groove 7. A state switching member 10 is slidably provided in the switching groove 9. The state switching member 10 is configured such that when the state switching member 10 slides into the sliding groove 7 and the motion seat 2 slides toward the base 1, the second elastic member 6 provides elastic force to the motion seat 2. When the state switching member 10 slides away from the sliding groove 7 and the motion seat 2 slides toward the base 1, the sliding member 8 slides in the sliding groove 7.

[0035] When the state switching element 10 slides away from the slide groove 7, the sliding element 8 is not limited in the slide groove 7. When the motion seat 2 slides towards the base 1, the sliding element 8 will also slide relative to the motion seat 7. At this time, the second elastic element 6 will not act on the motion seat 2, while the first elastic element 5 will always act on the motion seat 2, and the first elastic element 5 will provide it with the most basic elastic force, thereby realizing the first level of force feedback. Under the first level of force feedback, it can be adapted to users with lighter weight. When the state switching element 10 slides into the slide groove 7 and abuts against the sliding element 8, the sliding element 8 can no longer slide in the slide groove 7. When the motion seat 2 slides towards the base 1, it will slide together with the motion seat 2 on the second telescopic rod 4. At this time, the sliding element 8 will compress the second elastic element 6, so that both the first elastic element 5 and the second elastic element 6 act on the motion seat 2, thereby realizing the second level of force feedback. The two elastic elements can provide greater force feedback, which is adapted to users with heavier weight.

[0036] Specifically, such as Figure 3-8 As shown, the base 1 is located in front of the motion seat 2. The motion seat 2 includes an integrally formed first connecting part 21 and a second connecting part 22. The first connecting part 21 has a through slot 11, and the first telescopic rod 3 is inserted into the slot 11. The first elastic member 5 abuts against the first connecting part 21. The sliding groove 7 is formed on the second connecting part 22 and extends in the front-rear direction. The switching groove 9 extends in the left-right direction and extends from the first connecting part 21 to the second connecting part 22. The switching groove 9 is located beside the middle of the sliding groove 7. The second connecting part 22 includes a sleeve part 221, which protrudes forward from the first connecting part 21. The sliding groove 7 extends from the front end of the sleeve part 221. The second connecting part 22 is opened to the rear end, but does not penetrate the second connecting part 22. The rear end of the second connecting part 22 also has a hole so that the rear end of the second telescopic rod 4 can be inserted into the second connecting part 22. When the moving seat 2 moves towards the base 1, the second telescopic rod 4 can extend out of the hole. Similarly, the first telescopic rod 3 can also extend out of the slot 11 to the rear of the moving seat 2. The first elastic member 5 and the second elastic member 6 are both compression springs, and the length of the first elastic member 5 is greater than the length of the second elastic member 6. In order to make the overall structure more compact and smaller in size, the first elastic member 5 is longer than the second elastic member 6 to complement the second connecting part 22 being longer than the first connecting part 21.

[0037] The left and right connecting parts of the motion seat 2 are slidably mounted on the two telescopic rods and have different structures under different functional requirements. The first connecting part 21 only needs to be provided with a slot 11, which can be directly inserted into the first telescopic rod 3 and the first elastic member 5 can act on it. The second connecting part 22 needs to be provided with a sliding groove 7 corresponding to the sliding member 8, and a switching groove 9 is provided on the side of the middle of the sliding groove 7 for selective limiting of the sliding member 8. The switching groove 9 is directly provided between the first connecting part 21 and the second connecting part 22, without the need for protruding parts on the motion seat 2. The structure is more compact, the space occupied by the device is reduced, and the overall structure is more regular and compact, which is convenient for installation. The sleeve part 221 increases the length of the second connecting member to accommodate the sliding length of the sliding member 8.

[0038] Furthermore, such as Figure 10 As shown, the switching groove 9 extends from the side end face of the second connecting part 22 toward the first connecting part 21, so as to accommodate the state switching member 10. The state switching member 10 is plate-shaped, and the state switching member 10 is provided with a first clearance groove 12 for clearance of the slot 11 and a second clearance groove 13 for clearance of the second telescopic rod 4. The state switching member 10 is disposed between the two telescopic rods, which reduces the overall volume, but at the same time, it is necessary to open the corresponding clearance groove to clearance of the telescopic rod.

[0039] A transmission component 14 is rotatably mounted on the motion seat 2. The motion seat 2 has a window 15 that is shared with the switching groove 9. The transmission component 14 is connected to the state switching component 10 through the window 15. The transmission component 14 is configured to drive the state switching component 10 to slide left and right in the switching groove 9 when the transmission component 14 rotates, thereby realizing the control of the state switching component 10. The transmission component 14 is a torsion spring and has elasticity. After the transmission component 14 rotates, it can wait until the sliding component 8 returns to the sleeve part 221 before delaying the drive of the state switching component 10 into the slide groove 7 to abut against the sliding component 8.

[0040] like Figure 9As shown, the second telescopic rod 4 is provided with a limiting ring 16, which is locked onto the second telescopic rod 4 and located in the sliding member 8. The sliding member 8 has a clearance hole 17 with a diameter larger than that of the second telescopic rod 4 and greater than or equal to the diameter of the limiting ring 16. The clearance hole 17 extends forward from the rear end of the sliding member 8 but does not penetrate the sliding member 8, so that the limiting ring 16 can act on the front part of the sliding member 8. The limiting ring 16 is configured to prevent the sliding member 8 from moving away from the second elastic member 6. Under the action of the limiting ring 16, the sliding member 8 can maintain its relative position with the second elastic member 6 when the motion seat 2 slides, and will not separate from the second elastic member 6. This allows the state switching member 10 to smoothly abut against the sliding member 8 and make the second elastic member 6 output force feedback, ensuring the normal realization of the function. Under the action of the clearance hole 17, the second elastic member 6 is compressed. When the sliding member 8 slides relative to the second telescopic rod 4, the second telescopic rod 4 can extend the sliding member 8 backward, and even allow the limiting ring 16 to extend out of the clearance hole 17.

[0041] The slider 8 is provided with two protrusions 18, located at the upper and lower parts of the slider 8 respectively. The protrusions 18 are arranged along the length of the slider 8. The protrusions 18 are configured to prevent the slider 8 from rotating in the slide groove 7 and to increase the contact area between the slider 8 and the state switching member 10. The protrusions 18 serve two purposes, making the operation more stable.

[0042] like Figure 1 , 2 As shown, the device is applied in a chassis, which includes a base shell 19, an armrest seat 20, a seat connector 23, and a backrest connector (not shown). The base shell 19 is used to connect the gas spring of the seat, the seat connector 23 is used to connect the seat of the seat, and the backrest connector is used to connect the backrest of the seat. The armrest seat 20 is fixedly connected to the base shell 19, the backrest connector is rotatably connected to the armrest seat 20, and the seat connector 23 is slidably disposed on the base shell 19 and rotatably connected to the backrest connector, thereby realizing seat-back linkage. The device indirectly acts on the backrest connector by acting on the seat connector 23. The chassis has installation spaces on the left and right sides, and there are two of the device, which are respectively installed in the two installation spaces. The base 1 is used to connect the base shell 19, and the motion seat 2 is used to connect the seat connector 23. The transmission component 14 is controlled by a pull cable.

Claims

1. A backrest force feedback adjustment device, characterized in that: The device includes a base and a moving seat, which are spaced apart. The base has a first telescopic rod and a second telescopic rod, which are inserted into the moving seat. The moving seat is slidably connected to the first and second telescopic rods. A first elastic element and a second elastic element are respectively fitted onto the first and second telescopic rods. The two ends of the first elastic element abut against the base and the moving seat, respectively, and are configured to provide elastic force to the moving seat when it slides towards the base. The moving seat has a sliding groove, and a sliding element is installed within the groove. The sliding element is fitted onto the second telescopic rod, and the two ends of the second elastic element abut against the base and the sliding element, respectively. The moving seat also has a switching groove, which is connected to the sliding groove. A state switching element is slidably installed within the switching groove. The state switching element is configured such that when it slides into the groove and the moving seat slides towards the base, the second elastic element provides elastic force to the moving seat; when it slides out of the groove and the moving seat slides towards the base, the sliding element slides within the groove.

2. The backrest force feedback adjustment device according to claim 1, characterized in that: The motion seat includes an integrally formed first connecting part and a second connecting part. The first connecting part has a through slot, a first telescopic rod is inserted into the slot, and a first elastic element abuts against the first connecting part. The sliding groove is formed on the second connecting part and extends in the front-back direction. The switching groove extends in the left-right direction and extends from the first connecting part to the second connecting part. The switching groove is located on the side of the middle part of the sliding groove.

3. The backrest force feedback adjustment device according to claim 2, characterized in that: The second connecting part includes a sleeve portion that protrudes forward from the first connecting part.

4. The backrest force feedback adjustment device according to claim 2, characterized in that: The state switching component is plate-shaped, and has a first clearance groove for avoiding the slot and a second clearance groove for avoiding the second telescopic rod.

5. The backrest force feedback adjustment device according to claim 1, characterized in that: The length of the first elastic element is greater than the length of the second elastic element.

6. The backrest force feedback adjustment device according to claim 1, characterized in that: Both the first and second elastic elements are compression springs.

7. The backrest force feedback adjustment device according to claim 1, characterized in that: A transmission component is rotatably mounted on the motion seat. The motion seat has a window that shares the same space as the switching slot. The transmission component is connected to the state switching component through the window. The transmission component is configured to drive the state switching component to slide left and right in the switching slot when it rotates.

8. The backrest force feedback adjustment device according to claim 7, characterized in that: The transmission component is a torsion spring.

9. The backrest force feedback adjustment device according to claim 1, characterized in that: The second telescopic rod is equipped with a limiting ring, which is located in the sliding member and is configured to prevent the sliding member from moving away from the second elastic member.

10. The backrest force feedback adjustment device according to claim 1, characterized in that: The slider is provided with a protrusion, which is configured to prevent the slider from rotating in the groove and to increase the contact area between the slider and the state switching component.

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