Self-gravity seat

Abstract

The utility model discloses a self-gravity seat. The self-gravity seat comprises a base unit, a seat support unit slidably mounted on the base unit; the back supporting unit is rotationally connected with the seat supporting unit and the base unit, linkage control is formed by overturning of the back supporting unit and sliding of the seat supporting unit, and the included angle between the back supporting unit and the seat supporting unit is adjusted through front-back overturning of the back supporting unit relative to the base unit; the self-gravity seat further comprises a booster connected with the seat supporting unit and the base unit, the booster is configured to generate a damping stroke and a boosting stroke through linear telescopic movement, and the damping stroke of the booster provides buffering in the backward overturning process of the back supporting unit. The boosting stroke of the booster provides boosting force in the forward overturning process of the back supporting unit. According to the self-gravity seat disclosed by the utility model, the back supporting unit can be slowly overturned backwards to extend, a user can be assisted to get up, and the seat can automatically recover to a sitting position without operation of the user.

Description

[Technical Field]

[0001] This utility model relates to the field of seating technology, and in particular to a gravity-powered seating system. [Background Technology]

[0002] Existing chairs include a base unit, a seat support unit, and a back support unit. The seat support unit is slidably mounted on the base unit, while the back support unit is rotatably connected to both the seat support unit and the base unit, allowing the back support unit to rotate back and forth relative to the base unit. The rotation of the back support unit and the sliding of the seat support unit are linked and controlled. The back-and-forth rotation of the back support unit relative to the base unit is used to adjust the angle between the back support unit and the seat support unit, providing users with the option to adjust to different postures such as sitting, TV-like, and reclining. However, the rotation speed of the existing back support unit depends on the user's weight; the heavier the user, the faster the back support unit rotates backward. Therefore, when a heavier person leans against the back support unit, it may abruptly and rapidly extend to its limit position, resulting in a poor user experience.

[0003] To address the aforementioned technical issues, patent publication number CN218419065U also discloses an adaptive linkage control functional chair. This chair features a damping sliding mechanism between the base unit and the seat support unit. This mechanism adjusts the frictional resistance between the base unit and the seat support unit. When the frictional resistance adjusted by the damping sliding mechanism is zero or negligible, the back support unit only needs a small force to unfold with the seat support unit, forming a TV position or a reclining position. When retracting, the user only needs to apply a backward force to the seat support unit, which will cause the back support unit to reset, allowing the chair to quickly return to the sitting position. For heavier users, the frictional resistance between the seat support unit and the base unit can be increased by adjusting the damping sliding mechanism. This increases the force required for the back support unit and seat support unit to extend and retract, reducing the backward tilting speed of the back support unit. Once the damping sliding mechanism is adjusted, the damping effect remains constant throughout the sliding process of the back support unit and seat support unit. Therefore, by adjusting the damping magnitude of the damping sliding mechanism, it can meet the needs of users with different sitting postures, weights, and heights. The extension and retraction of the seat is smoother and more natural, without abrupt extension issues, allowing users to adapt to different scenarios such as sitting, TV-like, and reclining postures.

[0004] Therefore, it can be seen that existing chairs require users to adjust the frictional damping force of the damping sliding mechanism according to their own weight in order to achieve smooth and natural extension and retraction. Furthermore, when a user adjusts from a reclining position to a sitting position, a backward force needs to be applied to the seat support unit to passively return the chair to the sitting position. This results in users having to perform more operations, leading to a poor user experience. In addition, existing chairs require the user to apply force to the seat support unit after returning to a sitting position, meaning that the existing back support unit passively returns to the sitting position. This cannot provide assistance to elderly users or users with back problems when adjusting to a sitting position, making it inconvenient for elderly users or users with back problems to get up, further worsening the user experience for these users. [Utility Model Content]

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology and provide a self-weight seat that can slowly flip the back support unit backward to extend, help the user get up, and automatically return the seat to the sitting position without user operation, thus improving the user experience.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] Gravity-controlled seats include:

[0008] Base unit;

[0009] A seat support unit, which is slidably mounted on the base unit;

[0010] The back support unit is rotatably connected to the seat support unit and the base unit. The flipping of the back support unit and the sliding of the seat support unit are linked and controlled. The forward and backward flipping of the back support unit relative to the base unit is used to adjust the angle between the back support unit and the seat support unit.

[0011] The self-weight seat also includes an assist device connecting the seat support unit and the base unit, which is configured to generate a damping stroke and an assist stroke through linear telescopic movement. The damping stroke of the assist device provides cushioning during the rearward flipping of the back support unit, and the assist stroke of the assist device provides assistance during the forward flipping of the back support unit.

[0012] Using the above technical solution, when the user leans back on the back support unit, the back support unit will be driven to flip backward relative to the base unit. During this process, the booster will generate a damping stroke to provide cushioning during the backward flipping of the back support unit, allowing the back support unit to flip backward slowly and avoiding abrupt rapid unfolding. This requires no user intervention, thus improving the user experience. Furthermore, in this embodiment, the booster will generate an assist stroke during the forward flipping of the back support unit, providing assistance for the back support unit to flip forward automatically, thereby helping the user stand up. This provides a better user experience for elderly users or those with back problems. Finally, since the forward flipping of the back support unit will cause the seat support unit to reset, this embodiment uses the booster to assist the forward flipping of the back support unit, allowing the seat to automatically return to the sitting position without requiring the user to apply force to the seat support unit to reset, further reducing user intervention and improving the user experience.

[0013] In the aforementioned gravity-assisted seat, the booster is configured as a telescopic cylinder. This telescopic cylinder is stretched as the back support unit flips backward, generating a damping stroke; and automatically retracts as the back support unit flips forward, generating an assisting stroke. Since the greater the external pulling force on the telescopic cylinder, the greater the damping force it generates during its damping stroke, the seat can unfold at essentially the same speed for users of different weights. In other words, the seat in this technical solution can adaptively adjust according to the user's weight, unfolding at essentially the same speed.

[0014] In the aforementioned gravity-assisted seat, the base unit includes a ground-supporting base and a bracket connected to the ground-supporting base. The bracket includes a bottom bracket spanning below the seat support unit and side brackets located at both ends of the bottom bracket. The back support unit is rotatably connected to the side brackets, and the two ends of the power-assist device are rotatably connected to the seat support unit and the bottom bracket, respectively. This design utilizes the existing space below the seat support unit to install the power-assist device, making the overall seat structure more compact. It also allows the power-assist device to be hidden below the seat support unit, improving the seat's appearance and avoiding interference with user operation.

[0015] In the aforementioned gravity-assisted seat, the base bracket is located near the rear of the seat support unit. A first connecting seat for connecting one end of the booster is located in the middle of the base bracket, and a second connecting seat for connecting the other end of the booster is located in the middle of the front side of the seat support unit. By placing the base bracket near the rear of the seat support unit, the distance between the middle of the base bracket and the middle of the front side of the seat support unit is increased, allowing for the installation of a booster with a longer extension length. This satisfies the maximum forward sliding distance of the seat support unit and allows for a larger angle between the back support unit and the seat support unit. Furthermore, the connection of both ends of the booster to the first connecting seat in the middle of the base bracket and the second connecting seat in the middle of the front side of the seat support unit, respectively, balances the force on the seat support unit, enabling smooth sliding and preventing lateral swaying.

[0016] In the aforementioned gravity-assisted seat, one of the seat support unit and the base unit is equipped with a guide rail, and the other with a guide shaft. The guide rail includes a first limiting end, a second limiting end, and a guide surface located between the two. The guide shaft and the guide surface support each other and move relative to each other as the seat support unit slides. The first limiting end and the second limiting end limit the travel distance of the guide shaft on the guide rail. This design, by limiting the travel distance of the guide shaft on the guide rail, limits the rotation angle of the back support unit, ensuring the back support unit remains in both the sitting and reclining positions at their extreme points.

[0017] In the aforementioned gravity-assisted seat, the first limiting end and / or the second limiting end are configured as elastic components capable of forming soft contact with the guide shaft, serving to cushion the guide shaft at the end of the travel stroke; alternatively, an elastic component is provided on the guide shaft to cushion the guide shaft at the end of the travel stroke. This design avoids the occurrence of noise caused by the guide shaft colliding with the first or second limiting end at the end of the travel stroke.

[0018] In the aforementioned gravity-fed seat, the guide rail is provided with a strip-shaped guide hole. The two ends of the guide hole form a first limiting end and a second limiting end, respectively. One side wall of the guide hole constitutes the guide surface, while the opposite side wall maintains a gap with the guide shaft. This design reduces the contact area between the guide shaft and the guide hole, thereby reducing the wear on the guide shaft and extending its service life. Furthermore, it reduces the frictional resistance experienced by the seat support unit when sliding relative to the base unit, making the sliding of the seat support unit smoother.

[0019] In the aforementioned gravity-assisted seat, the linear telescopic movement of the power assist is limited to a preset allowable stroke, which is greater than or equal to the travel of the guide shaft on the guide rail. This design ensures that the guide shaft can move to the first and second limiting ends, thereby ensuring that the angle between the back support unit and the seat support unit meets the set range.

[0020] In the aforementioned gravity-fed seat, the back support unit, after tilting backward at a predetermined angle, presses against the rear side of the seat support unit to create a secondary cushioning effect. This design, through secondary cushioning, reduces the tilting speed of the back support unit as it tilts backward at the predetermined angle and continues to tilt backward, thereby reducing the movement speed of the guide shaft relative to the guide surface. This, in turn, reduces the impact force between the guide shaft and the guide hole, achieving the goal of reducing or eliminating impact noise.

[0021] In the aforementioned gravity-fed seat, the seat support unit includes a seat frame and a seat support pad disposed on the seat frame, and the back support unit includes a back frame and a back support pad disposed on the back frame. The seat frame and the back frame are rotatably connected. After the back support unit is flipped backward at a predetermined angle, the back support pad and the rear side of the seat support pad are pressed against each other to create secondary cushioning. This design not only improves user comfort through the back support pad and seat support pad, but also utilizes the mutual compression between the rear sides of the back support pad and seat support pad to create secondary cushioning, achieving a dual-purpose effect without the need for additional structures to achieve secondary cushioning, thus simplifying the seat structure.

[0022] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and accompanying drawings. [Attached Image Description]

[0023] The present invention will be further described below with reference to the accompanying drawings:

[0024] Figure 1 This is a structural diagram of the gravity-powered chair in the first embodiment of the present invention when the seat support pad and back support pad are removed and the chair is in a sitting position.

[0025] Figure 2 for Figure 1 A magnified view of part A in the diagram;

[0026] Figure 3 This is a schematic diagram of the structure of the self-weight seat in the first embodiment of the present invention when the seat support pad and back support pad are removed and the seat is in the extreme lying position.

[0027] Figure 4 for Figure 3 A magnified view of part B in the diagram;

[0028] Figure 5 This is a structural diagram of the gravity-powered seat in the extreme reclining position of Embodiment 1 of this utility model;

[0029] Figure 6 This is a structural diagram of the gravity-powered seat in the pre-limit position of the reclining posture in Embodiment 1 of this utility model;

[0030] Figure 7 for Figure 6 A magnified view of part C in the diagram.

[0031] Figure label:

[0032] 100. Base unit; 110. Ground support base; 111. Support column; 112. Support foot; 120. Bracket; 121. Bottom bracket; 122. Side bracket; 123. First connecting seat; 1221. First section; 1222. Second section; 200. Seat support unit; 210. Seat frame; 211. Second pivot; 212. Second connecting seat; 220. Guide rail; 221. First limiting end; 222. Second limiting end; 223. Guide surface; 224. Guide hole; 225. Elastic component; 230. Guide shaft; 231. Nut; 240. Seat support pad; 300. Back support unit; 310. Back frame; 311. First pivot; 320. Back support pad; 400. Booster; 410. Cylinder; 420. Piston rod.

Detailed Implementation Methods

[0033] This utility model provides a gravity-powered seat, comprising:

[0034] Base unit;

[0035] A seat support unit, which is slidably mounted on the base unit;

[0036] The back support unit is rotatably connected to the seat support unit and the base unit. The flipping of the back support unit and the sliding of the seat support unit are linked and controlled. The forward and backward flipping of the back support unit relative to the base unit is used to adjust the angle between the back support unit and the seat support unit.

[0037] The self-weight seat also includes an assist device connecting the seat support unit and the base unit, which is configured to generate a damping stroke and an assist stroke through linear telescopic movement. The damping stroke of the assist device provides cushioning during the rearward flipping of the back support unit, and the assist stroke of the assist device provides assistance during the forward flipping of the back support unit.

[0038] Using the above technical solution, when the user leans back on the back support unit, the back support unit will be driven to flip backward relative to the base unit. During this process, the booster will generate a damping stroke to provide cushioning during the backward flipping of the back support unit, allowing the back support unit to flip backward slowly and avoiding abrupt rapid unfolding. This requires no user intervention, thus improving the user experience. Furthermore, in this embodiment, the booster will generate an assist stroke during the forward flipping of the back support unit, providing assistance for the back support unit to flip forward automatically, thereby helping the user stand up. This provides a better user experience for elderly users or those with back problems. Finally, since the forward flipping of the back support unit will cause the seat support unit to reset, this embodiment uses the booster to assist the forward flipping of the back support unit, allowing the seat to automatically return to the sitting position without requiring the user to apply force to the seat support unit to reset, further reducing user intervention and improving the user experience.

[0039] The technical solutions of the embodiments of this utility model will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of this utility model and not all of them. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without creative effort are all within the protection scope of this utility model. In addition, it should be understood that the terms "upper," "lower," "left," "right," "longitudinal," "lateral," "inner," "outer," "vertical," "horizontal," "top," and "bottom," etc., indicating orientation or positional relationship, are only based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They are not intended to indicate or imply that the device / component must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0040] Example 1

[0041] like Figures 1 to 7 As shown, the self-weight seat in this embodiment includes a base unit 100, a seat support unit 200, and a back support unit 300. The seat support unit 200 is slidably mounted on the base unit 100, while the back support unit 300 is rotatably connected to both the seat support unit 200 and the base unit 100. The flipping of the back support unit 300 and the sliding of the seat support unit 200 are linked for control. The forward and backward flipping of the back support unit 300 relative to the base unit 100 is used to adjust the angle between the back support unit 300 and the seat support unit 200, so as to meet the user's needs for adjusting different scene modes such as sitting posture, TV posture, and reclining posture.

[0042] The self-weight seat in this embodiment also includes an assistor 400 that connects the seat support unit 200 and the base unit 100. It is configured to generate a damping stroke and an assisting stroke through linear telescopic motion. The damping stroke of the assistor 400 provides cushioning during the rear support unit 300 flips backward, and the assisting stroke of the assistor 400 provides assistance during the rear support unit 300 flips forward.

[0043] When the user leans back on the back support unit 300, it drives the back support unit 300 to flip backward relative to the base unit 100. During this process, the booster 400 generates a damping stroke to provide cushioning during the backward flipping of the back support unit 300, allowing it to flip backward slowly and avoiding abrupt, rapid unfolding. This requires no user intervention, thus improving the user experience. Additionally, in this embodiment, the booster 400 generates an assist stroke during the forward flipping of the back support unit 300, providing assistance for its forward flipping and enabling it to automatically flip forward, thus helping the user stand up. This provides a better experience for elderly users or those with back problems. Finally, since the forward flipping of the back support unit 300 causes the seat support unit 200 to reset, this embodiment uses the booster 400 to assist the forward flipping of the back support unit 300, allowing the seat to automatically return to a sitting position without requiring the user to apply force to the seat support unit 200 to reset. This further reduces user intervention and enhances the user experience.

[0044] Specifically, such as Figure 1 and 3As shown, in this embodiment, the base unit 100 includes a ground support base 110 and a bracket 120 connected to the ground support base 110. The ground support base 110 includes a support column 111 and a plurality of support feet 112 mounted on the support column 111. The support feet 112 support the ground. The bracket 120 includes a bottom bracket 121 and side brackets 122. The bottom bracket 121 extends across the lower part of the base support unit 200 in the left-right direction and is mounted on the support column 111. There are two side brackets 122, and the two side brackets 122 are respectively connected to the bottom bracket 121. The left and right ends are fixedly connected. The side bracket 122 includes a first segment 1221 extending forward and backward and a second segment 1222 extending upward from the rear end of the first segment 1221. The first segment 1221 is fixedly connected to the bottom bracket 121. In order to realize the rotatable connection between the back support unit 300 and the base unit 100, the back support unit 300 in this embodiment includes a back frame 310. The left and right sides of the back frame 310 are respectively rotatably mounted on the two second segments 1222 through the first rotating shaft 311, so as to realize the rotatable connection between the back support unit 300 and the side bracket 122. The seat support unit 200 includes a seat frame 210, which is slidably mounted between two side supports 122 and can slide back and forth relative to the supports 120, so that the seat support unit 200 can be slidably mounted on the base unit 100. In order to realize the rotatable connection between the back support unit 300 and the seat support unit 200, the rear ends of the seat frame 210 are respectively rotatably mounted on the lower end of the back frame 310 through the second rotating shaft 211. Thus, the back frame 310 flipping backward will drive the seat frame 210 to slide forward, and the back frame 310 flipping forward will drive the seat frame 210 to slide backward, so that the flipping of the back support unit 300 and the sliding of the seat support unit 200 are linked and controlled.

[0045] In this embodiment, the booster 400 is configured as a tension cylinder, also known as a traction gas spring. In its free state, it is at its shortest position. When traction is applied, it moves from its shortest to its longest position. Therefore, the tension cylinder is stretched as the back support unit 300 flips backward, generating a damping stroke. As the back support unit 300 flips forward, it automatically retracts, generating an assist stroke. Since the tension cylinder generates a greater damping force during its damping stroke when subjected to a greater external pulling force—meaning that a heavier person leans back against the back support unit 300 to flip backward, the tension cylinder generates a greater damping force, while a lighter person leans back against the back support unit 300 to flip backward, the tension cylinder generates a smaller damping force. Therefore, when people of different weights use the seat, the seat unfolds at approximately the same speed. In other words, the seat can adaptively adjust according to the user's weight, unfolding at approximately the same speed.

[0046] In this embodiment, the power booster 400 includes a cylinder 410 and a piston rod 420 that extends and retracts relative to the cylinder 410. The outer ends of the cylinder 410 and the piston rod 420 are rotatably connected to the seat support unit 200 and the base bracket 121, respectively. This design utilizes the existing space under the seat support unit 200 to install the power booster 400, making the overall structure of the seat more compact. It also allows the power booster 400 to be hidden under the seat support unit 200, improving the seat's appearance and avoiding interference with user use.

[0047] In this embodiment, the bottom bracket 121 is located near the rear side of the seat support unit 200. A first connecting seat 123 is fixedly connected to the middle of the bottom bracket 121. The first connecting seat 123 is rotatably connected to the outer end of the piston rod 420 through a third rotating shaft. A second connecting seat 212 is provided in the middle of the front side of the seat frame 210. The cylinder body 410 is rotatably connected to the second connecting seat 212 through a fourth rotating shaft. By bringing the base bracket 121 closer to the rear side of the seat support unit 200, the distance between the middle of the base bracket 121 and the middle of the front side of the seat support unit 200 can be increased, that is, the distance between the first connecting seat 123 and the second connecting seat 212 can be increased, so that a longer extension booster 400 can be installed between them, thereby satisfying the maximum forward sliding distance of the seat support unit 200 and making the angle between the back support unit 300 and the seat support unit 200 larger. In addition, the two ends of the booster 400 are respectively connected to the first connecting seat 123 located in the middle of the base bracket 121 and the second connecting seat 212 located in the middle of the front side of the seat support unit 200, so that the seat support unit 200 is balanced by force, thereby allowing smooth sliding and avoiding left and right swaying.

[0048] like Figure 2 and Figure 4 As shown, in order to enable the seat frame 210 to slide between the two side supports 122, the left and right sides of the seat frame 210 in this embodiment are also provided with downwardly extending guide rails 220. The guide rails 220 are located inside the side supports 122. The guide rails 220 include a first limiting end 221, a second limiting end 222, and a guide surface 223 located between them. A guide shaft 230 is installed on the first section 1221. The guide shaft 230 and the guide surface 223 support each other and move relative to each other as the seat support unit 200 slides. The first limiting end 221 and the second limiting end 222 limit the travel of the guide shaft 230 on the guide rail 220. With this design, by limiting the travel of the guide shaft 230 on the guide rail 220, the flip angle of the back support unit 300 can be limited to ensure the state of the back support unit 300 in two extreme positions: a sitting position and a lying position.

[0049] In this embodiment, the guide rail 220 is provided with a strip-shaped guide hole 224, which extends back and forth. The guide hole 224 has a first limiting end 221 and a second limiting end 222. The first limiting end 221 is located in front of the second limiting end 222. The guide shaft 230 passes through the guide hole 224. The end of the guide shaft 230 away from the side bracket 122 is provided with a threaded section that is threadedly connected to the nut 231. The nut 231 limits the guide shaft 230 to prevent it from disengaging from the guide hole 224. In this embodiment, when the seat is in the extreme reclining position (e.g., Figure 3 and Figure 4 As shown), the guide shaft 230 abuts against the second limiting end 222. When the seat is in a sitting position (as shown), Figure 1 and Figure 2 As shown, the guide shaft 230 abuts against the first limiting end 221. In this embodiment, the portion of the guide shaft 230 that passes through the guide hole 224 is a cylindrical segment. The two ends of the guide hole 224 are arc-shaped surfaces adapted to the cylindrical segment. The vertical width of the guide hole 224 is greater than the diameter of the cylindrical segment. At this time, the upper side wall of the guide hole 224 forms the guide surface 223, while the lower side wall of the guide hole 224 maintains a gap with the guide shaft 230. This design reduces the contact area between the guide shaft 230 and the guide hole 224, thereby reducing the wear of the guide shaft 230 and extending its service life. In addition, it also reduces the frictional resistance experienced by the seat support unit 200 when sliding relative to the base unit 100, making the sliding of the seat support unit 200 smoother.

[0050] It should be noted that in this embodiment, the linear telescopic movement of the booster 400 is limited to a preset allowable stroke. The allowable stroke is greater than or equal to the travel of the guide shaft 230 on the guide rail 220. For example, the preset allowable stroke of the booster 400 is L1, and the travel of the guide shaft 230 on the guide rail 220 is L2, that is, the distance between the first limiting end 221 and the second limiting end 222 is L2, which satisfies L1≥L2. This design ensures that the guide shaft 230 can move to the first limiting end 221 and the second limiting end 222, so as to ensure that the angle between the back support unit 300 and the seat support unit 200 meets the set range.

[0051] With the assistance of the power-assistor 400, when the seat automatically returns from the extreme reclining position to the sitting position, the guide shaft 230 moves relatively quickly relative to the guide surface 223. This can cause the guide shaft 230 to collide with the first limiting end 221, resulting in noise. To avoid this, in this embodiment, an elastic component 225, such as a rubber block or silicone block, is installed at the front end of the guide hole 224. The rear side of the elastic component 225 forms the first limiting end 221, which allows the first limiting end 221 to form a soft contact with the guide shaft 230, thereby buffering the guide shaft 230 at the end of the power-assisting stroke and preventing the guide shaft 230 from colliding with the first limiting end 221 at the end of the power-assisting stroke, thus avoiding noise.

[0052] It is understood that in other embodiments of this utility model, an elastic component is provided on the side of the guide shaft facing the first limiting end. In this case, the front end of the guide hole forms the first limiting end. This design also allows the first limiting end to form soft contact with the guide shaft.

[0053] In this embodiment, during the process of the back support unit 300 flipping backward to bring the seat to its extreme reclining position, although the speed of the back support unit 300 flipping backward is slower than in the prior art, there is still a possibility that the guide shaft 230 may move too fast and collide with the second limiting end 222, generating noise. To avoid this, in this embodiment, after the back support unit 300 flips backward at a predetermined angle, it presses against the rear side of the seat support unit 200 to create a secondary buffer. This design, through secondary buffering, reduces the flipping speed of the back support unit 300 after flipping backward at a predetermined angle and continuing to flip backward, thereby reducing the movement speed of the guide shaft 230 relative to the guide surface 223, causing the guide shaft 230 to slowly approach the second limiting end 222, thus reducing the impact force between the guide shaft 230 and the second limiting end 222, achieving the purpose of reducing or eliminating impact noise.

[0054] To achieve secondary cushioning, the seat support unit 200 in this embodiment further includes a seat support pad 240 disposed on the seat frame 210, and the back support unit 300 further includes a back support pad 320 disposed on the back frame 310. This design improves user comfort through the back support pad 320 and the seat support pad 240. When the seat is in a seated position, there is a gap between the back support pad 320 and the seat support pad 240. When the back support unit 300 flips backward to eliminate the gap, causing the back support pad 320 to contact the seat support pad 240 (e.g....), Figure 6 As shown), at this time, the back support unit 300 flips backward to a predetermined angle, and there is still a certain distance between the guide shaft 230 and the second limiting end 222 (as shown). Figure 7As shown), the back support unit 300 then continues to flip backward, causing the back support pad 320 and the seat support pad 240 to press against each other to create a secondary buffer. This allows the guide shaft 230 to move more slowly toward the second limiting end 222, thereby reducing the impact force between the guide shaft 230 and the second limiting end 222. In other words, the back support pad 320 and the seat support pad 240 in this embodiment serve a dual purpose, eliminating the need for additional structures to achieve secondary buffering, thus simplifying the structure of the seat.

[0055] It should be noted that in other embodiments of this utility model, the first limiting end can also be defined as being located behind the second limiting end. In this case, the front end of the guide hole is provided with an elastic component, the rear side of the elastic component forms the second limiting end, and correspondingly, the rear end of the guide hole forms the first limiting end.

[0056] It is understood that in other embodiments of this utility model, the cylinder body may also be hinged to the first connecting seat, and the outer end of the piston rod may be hinged to the second connecting seat.

[0057] It is understood that in other embodiments of this utility model, the booster may also be configured as a compression spring, one end of which is connected to the first connecting seat and the other end of which is connected to the second connecting seat. The compression spring is stretched during the back support unit's backward flip to generate a damping stroke to provide cushioning, and provides assistance during the back support unit's forward flip to enable the seat to automatically return to the sitting position.

[0058] It is understood that in other embodiments of this utility model, when the back support pad and seat support pad are not provided, in order to avoid noise caused by the impact between the guide shaft and the second limiting end, an elastic component, such as a rubber block or a silicone block, is installed at the rear end of the guide hole. The front side of the elastic component forms the second limiting end, thereby allowing the second limiting end to form soft contact with the guide shaft. Alternatively, the rear end of the guide hole forms the second limiting end, and an elastic component is provided on the side of the guide shaft facing the second limiting end. This design also allows the second limiting end to form soft contact with the guide shaft, thereby damping the end of the stroke and buffering the guide shaft.

[0059] It is understood that in other embodiments of this utility model, the guide hole may also be provided on the side bracket, and the guide shaft may be provided on the seat frame and pass through the guide hole. In this case, the lower side wall of the guide hole forms a guide surface, and a gap is maintained between the guide shaft and the upper side wall of the guide hole.

[0060] It is understood that in other embodiments of this utility model, the guide shaft may also be provided on the seat frame. In this case, the inner side of the side bracket is provided with a support rib extending forward and backward. The support rib has a U-shaped structure with the opening facing upward. The top surface of the horizontal section of the support rib forms a guide surface. The guide shaft is supported on the guide surface. The two vertical sections of the support rib limit the travel of the guide shaft.

[0061] It is understood that in other embodiments of this utility model, the guide shaft may also be provided on the side bracket. In this case, the seat frame is provided with a support rib extending forward and backward. The support rib has a U-shaped structure with the opening facing downward. The bottom surface of the horizontal section of the support rib forms a guide surface, which is supported on the guide shaft. The two vertical sections of the support rib limit the travel of the guide shaft on the guide rail.

[0062] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the content described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. A self-gravity chair, comprising: a base unit; a seat support unit slidingly mounted to the base unit; a back support unit pivotally connected to the seat support unit and the base unit respectively, the back support unit being linked to the seat support unit to be controlled in a coordinated manner by the back support unit being pivoted and the seat support unit being slid, the back support unit being pivoted forward and backward relative to the base unit to adjust the included angle between the back support unit and the seat support unit; characterized in that the self-gravity chair further comprises an actuator connecting the seat support unit and the base unit, the actuator being configured to generate a damping stroke and an assisting stroke by linear extension and retraction, the damping stroke of the actuator providing a buffer during the backward pivoting of the back support unit, and the assisting stroke of the actuator providing an assistance during the forward pivoting of the back support unit.

2. The self-gravity chair of claim 1, wherein, The actuator is configured as a stretchable cylinder, the stretchable cylinder being stretched to generate the damping stroke during the backward pivoting of the back support unit, and being automatically retracted to generate the assisting stroke during the forward pivoting of the back support unit.

3. The self-gravity chair of claim 1, wherein, The base unit comprises a ground supporting base and a bracket connected to the ground supporting base, the bracket comprising a bottom bracket spanning below the seat support unit and side brackets arranged at both ends of the bottom bracket, the back support unit being pivotally connected to the side brackets, and both ends of the actuator being pivotally connected to the seat support unit and the bottom bracket respectively.

4. The self-gravity chair of claim 3, wherein, The bottom bracket is close to the back side of the seat support unit, and a first connecting seat for connecting one end of the actuator is arranged at the middle of the bottom bracket, and a second connecting seat for connecting the other end of the actuator is arranged at the middle of the front side of the seat support unit.

5. The self-gravity chair of claim 1, wherein, One of the seat support unit and the base unit is configured with a guide rail, and the other is configured with a guide shaft, the guide rail comprising a first limiting end, a second limiting end and a guide surface therebetween, the guide shaft being supported by the guide surface and moving relative to the guide surface during the sliding of the seat support unit, and the first limiting end and the second limiting end defining the moving stroke of the guide shaft on the guide rail.

6. The self-gravity chair of claim 5, wherein, The first limiting end and / or the second limiting end is arranged as an elastic component to form a soft contact with the guide shaft, for buffering the guide shaft at the end of the moving stroke. Alternatively, an elastic component is arranged on the guide shaft to buffer the guide shaft at the end of the moving stroke.

7. The self-gravity chair of claim 5, wherein, A strip-shaped guide hole is arranged on the guide rail, both ends of the guide hole forming the first limiting end and the second limiting end respectively, one side wall of the guide hole constituting the guide surface, and the other side wall maintaining a gap with the guide shaft.

8. The self-gravity chair of claim 5, wherein, The linear extension and retraction of the actuator is limited within a preset allowable stroke, the allowable stroke being greater than or equal to the moving stroke of the guide shaft on the guide rail.

9. The self-gravity chair of claim 1, wherein, The back support unit is pressed against the back side of the seat support unit to generate a secondary buffer after being pivoted backward by a predetermined angle.

10. The self-gravity chair of claim 9, wherein, The seat support unit comprises a seat frame and a seat support pad arranged on the seat frame, and the back support unit comprises a back frame and a back support pad arranged on the back frame, the seat frame being pivotally connected to the back frame, and the back support pad being pressed against the back side of the seat support pad to generate a secondary buffer after the back support unit is pivoted backward by a predetermined angle.

Images