Hovering mechanism, backrest, seat and adjusting method thereof

Abstract

The invention discloses a hovering mechanism, a backrest, a seat and an adjusting method of the hovering mechanism, and relates to the technical field of furniture manufacturing, the hovering mechanism comprises a supporting part and a moving part, the moving part is movably connected to the supporting part through a lifting hovering device, the lifting hovering device comprises a guide groove and a moving frame, and the guide groove and the moving frame are matched with each other. A constant-force spring is assembled on the moving frame, the spring torque of the constant-force spring is matched with the gravitational torque of the moving part, and the free end of a spring belt in the constant-force spring is connected to the moving part / supporting part; the moving frame is assembled on the supporting part / moving part; the guide groove is assembled on the moving part / supporting part, and the moving frame can move along the guide groove. According to the hovering mechanism, the backrest, the seat and the adjusting method of the hovering mechanism, the spring moment of the constant-force spring is matched with the gravitational moment of the moving part, and smooth movement of the moving part under the action of external force and automatic stepless hovering after force withdrawal are achieved.

Description

Technical Field

[0001] This invention relates to the field of furniture manufacturing technology, specifically to a suspension mechanism, a backrest, a seat, and an adjustment method thereof. Background Technology

[0002] In daily life and industrial applications, height-adjustable devices such as office chairs and medical care beds are ubiquitous. To meet the ergonomic needs of different users or different operating conditions, these devices typically require height adjustment functionality. Traditional height adjustment mechanisms often use components such as gas springs, hydraulic rods, or coil springs to achieve height adjustment. However, these structures have many limitations in practical use. For example, the adjustment of gas springs, compression springs, tension springs, and hydraulic rods usually relies on specific control switches or valves, requiring the user to use both hands during operation. The mechanisms are complex, the operation process is cumbersome and difficult to remember, and the adjustment process is stiff, disjointed, and provides a poor user experience. Furthermore, for ordinary backrest adjustment structures, when the body is reclined in a relaxed state, the backrest tilts backward, stretching the neck and headrest area. If the backrest, which originally conforms to the backrest, cannot adjust its position according to the body posture, the lower back will be unsupported, lacking effective support, which can cause lower back discomfort after prolonged use.

[0003] To address this issue, the applicant's earlier patent application, CN202311585616.5, disclosed an adjustable chair back. Users can adjust the chair back height autonomously by leaning against it, generating pressure on the height adjustment unit, simplifying the operation. However, this solution has drawbacks. To maintain the adjusted height, either the user needs to continuously apply force to overcome the elastic force of the backrest, or an additional locking step is required, locking the chair back at the current position using a posture limiting unit. The former prevents users from relaxing and provides a poor experience; the latter, while maintaining the position, relies on manual adjustment and is stepped, unable to achieve stepless suspension based on the user's body shape and posture, thus comfort needs improvement. Furthermore, because the elastic force of the elastic element changes with displacement during stretching or compression, the lower the backrest is adjusted, the greater the adjustment force the user needs to overcome. The chair back rebounds quickly, requiring significant effort for adjustment and resulting in a poor user experience.

[0004] Therefore, how to provide a mechanism that is simple in structure, smooth in adjustment, and can achieve stable stepless hovering at any adjustment position without additional locking operation, in order to overcome the problems of difficult adjustment, inability to achieve stepless hovering, and poor reliability in long-term use in the existing technology, has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems by providing a hovering mechanism, backrest, seat, and adjustment method thereof. By matching the spring torque of a constant-force spring with the gravitational torque of the moving part, smooth movement of the moving part under external force and automatic stepless hovering after the force is released are achieved. Compared to traditional mechanisms that rely on gas springs or hydraulic rods requiring two-hand operation and stiff adjustment, and prior solutions that require continuous force application or additional locking and only offer stepped adjustment, this technical solution solves the problems of cumbersome adjustment processes and the inability to achieve stepless hovering in existing technologies. Users only need to apply external force to adjust the height of the moving part, and it stops when the force is released, without any additional locking operation.

[0006] The technical solution adopted in this invention is as follows: A hovering mechanism includes a support part and a movable part. The movable part is movably connected to the support part via a lifting and hovering device. The lifting and hovering device includes a matching guide groove and a movable frame. A constant force spring is mounted on the movable frame. The spring torque of the constant force spring matches the gravitational torque of the movable part. The drum of the constant force spring is rotatably mounted on the movable frame via a rotating shaft. The fixed end of the spring band in the constant force spring is wound around the drum, and the free end of the spring band is connected to the movable part / support part. The movable frame is mounted on the support part / movable part. The guide groove is mounted on the movable part / support part, and the movable frame can move along the guide groove. When the movable part is not subjected to external force, the spring torque of the constant force spring and the gravitational torque of the movable part remain balanced, and the movable frame remains stationary relative to the guide groove, thereby restricting the movable part to its current position. When the movable part is subjected to external force along the extension direction of the guide groove, the movable frame changes position relative to the guide groove, and the spring band of the constant force spring is pulled out or pulled back from the drum, thereby changing the height of the movable part relative to the support part.

[0007] By employing the aforementioned technical solution, the spring torque of the constant force spring is matched with the gravitational torque of the moving part. When the moving part is not subjected to external force, the spring torque and the gravitational torque are balanced, allowing the moving part to hover at its current position. When an external force is applied, the moving part moves along the guide groove, and the spring band is pulled out or pulled back, achieving height adjustment. This hovering mechanism has a simple structure, requires no additional locking device, and can achieve stepless hovering at any position simply by applying force. The adjustment process is smooth and without jamming, making operation convenient.

[0008] Furthermore, the guide groove is an arc-shaped track, with its end bent towards the direction of the moving part. The guide groove extends vertically, or the extension direction of the guide groove forms an angle with the vertical direction; the drum is horizontally positioned; and the axial direction of the guide groove is perpendicular to the axial direction of the drum.

[0009] Thanks to the above technical solution, the guide groove is an arc-shaped track, allowing the moving part to move along the arc-shaped trajectory to adapt to different needs; the drum is set horizontally and its axis is perpendicular to the guide groove, so that the hovering mechanism can adapt to different installation angles and spatial layouts, while ensuring that the working direction of the constant force spring matches the direction of gravity, ensuring the accuracy of torque balance and expanding the application range.

[0010] Furthermore, several constant force springs are arranged side by side in the middle of the movable frame, and movable auxiliary structures are respectively provided on both sides of the movable frame in the horizontal direction. The movable auxiliary structures are slidably connected to the guide groove.

[0011] By adopting the above technical solution, several constant force springs are arranged side by side in the middle of the moving frame, and moving auxiliary structures are set on both sides of the moving frame and slidably connected to the guide grooves. This allows multiple springs to evenly distribute the weight of the moving part, resulting in force balance and reducing the load on a single constant force spring. At the same time, the compact structural design reduces the overall volume and improves the stability and reliability of operation.

[0012] Furthermore, the moving auxiliary structure is provided with a plurality of balls with rolling surfaces protruding from the surface of the moving auxiliary structure, and the balls are in rolling connection with the guide groove.

[0013] By adopting the above technical solution, the ball bearings with protruding rolling surfaces are set on the moving auxiliary structure, so that the moving auxiliary structure and the guide groove have rolling friction, which significantly reduces the moving resistance, makes the adjustment operation easier and smoother, and at the same time reduces friction noise and wear, and extends the service life.

[0014] Furthermore, the ball bearings include a plurality of side balls that contact the sidewall of the guide groove and a plurality of bottom balls that contact the bottom surface of the guide groove; the surface on which the side balls are located is also provided with an elastic support structure in the same direction as their protrusion.

[0015] Thanks to the above technical solution, the ball bearings include side ball bearings that contact the side wall of the guide groove and bottom ball bearings that contact the bottom surface, which effectively reduces the friction between the moving frame and the guide groove during movement, ensuring the straightness and stability of the movement, and improving the accuracy of the suspension mechanism and the user experience. The elastic support structure mainly plays a limiting role to prevent the moving frame from shaking in the width direction. The combination of the ball bearings and the elastic support structure ensures the accuracy and stability of the adjustment process.

[0016] A hovering backrest includes a backrest and a support. The backrest is movably mounted to the support via a lifting adjustment device, which includes a matching guide groove and a moving frame. A constant force spring is mounted on the moving frame, the spring torque of which matches the gravitational torque of the backrest. The drum of the constant force spring is rotatably mounted to the moving frame via a pivot. The fixed end of the spring band in the constant force spring is wound around the drum, and the free end of the spring band is connected to the backrest / support. The guide groove is mounted to the backrest / support, and the moving frame is mounted to the support / backrest. The moving frame can move along the guide groove. When the backrest is not subjected to external force, the spring torque of the constant force spring is balanced with the gravitational torque of the backrest, and the moving frame remains stationary relative to the guide groove, thus restricting the backrest to its current position. When the backrest is subjected to external force along the extension direction of the sliding track, the moving frame moves along the guide groove, and the spring band of the constant force spring is pulled out or pulled back from the drum, thereby changing the height of the backrest relative to the support.

[0017] Thanks to the aforementioned technical solution, the coordination of the guide groove, the moving frame, and the constant force spring balances the gravitational torque and spring torque of the backrest, enabling stepless suspension of the backrest at any height. Users only need to apply an upward or downward force to the backrest to adjust its height; it automatically stops hovering after the force is released. No additional operation is required, and the adjustment process is smooth and silent, greatly improving the comfort and convenience of the seat. This overcomes the shortcomings of existing technologies, such as laborious backrest adjustment, cumbersome operation, and the inability to achieve stepless suspension.

[0018] Furthermore, the guide groove is an arc-shaped track, with the end of the arc-shaped track bent toward the direction of the backrest; the drum is horizontally arranged; the axis of the guide groove is perpendicular to the axis of the drum; several constant force springs are arranged side by side in the middle of the movable frame, and the movable frame has a moving auxiliary structure on both sides in the horizontal direction, and the moving auxiliary structure is slidably connected to the guide groove.

[0019] By employing the aforementioned technical solution, this application utilizes an arc-shaped track and achieves force-bearing suspension positioning through the matching of constant-force springs and gravitational torque. When the user leans back, the friction between the backrest and the backrest generates an adjustment force, allowing the backrest to automatically and smoothly slide down the arc-shaped track according to the user's body posture. The movement trajectory of the backrest is an arc adapted to the arc-shaped track. During the descent of the backrest, its lower part pushes out towards the lumbar spine, ensuring that the backrest and the user's lumbar spine always maintain the most effective fit, effectively solving the problem of the lower back easily being unsupported when leaning back in traditional seats. The axis of the guide groove is perpendicular to the axis of the roller, and multiple constant-force springs are arranged side by side, allowing the backrest adjustment mechanism to adapt to different support structures and ensuring balanced force and smooth adjustment, further improving the smoothness and reliability of the adjustment.

[0020] Furthermore, the moving auxiliary structure is provided with a plurality of balls with rolling surfaces protruding from the surface of the moving auxiliary structure, and the balls are in rolling connection with the guide groove; the balls include a plurality of side balls that contact the side wall of the guide groove and a plurality of bottom balls that contact the bottom surface of the guide groove; the surface on which the side balls are located is also provided with an elastic support structure in the same direction as their protrusion.

[0021] By adopting the above technical solution, ball bearings, including side ball bearings and bottom ball bearings, are set on the movement auxiliary structure, so that the sliding friction of the backrest is changed into rolling friction, making the adjustment easier and smoother. At the same time, multi-directional limiting ensures the stability of the backrest movement, avoids multi-directional friction, and improves the smoothness of adjustment and long-term durability.

[0022] A hoverable seat includes the aforementioned hoverable backrest and a seat, wherein the hoverable backrest is mounted to the seat via a mounting structure.

[0023] By adopting the above-mentioned technical solution, the suspended backrest and seat are combined to form a suspended chair, which has a stepless backrest height adjustment function. Users can easily adjust the backrest height according to their own needs to obtain the best support, and no external force or additional operation is required to maintain the adjusted backrest height. The overall structure is compact and easy to operate, which improves the ergonomic performance and user experience of the chair. When the user sits on the chair and leans back, the backrest can automatically move with the tilt angle of the backrest and conform to the lumbar curve in real time, providing dynamic and full-process support, which greatly improves the comfort in a relaxed state.

[0024] A method for adjusting a hovering seat includes the following steps: Backrest adjustment steps: Apply an upward force to the backrest, the height of the backrest relative to the support increases, the moving frame moves forward along the guide groove, and when the height of the backrest is adjusted to the specified position, remove the upward force. At this time, the spring torque of the constant force spring and the gravitational torque of the backrest are balanced, the backrest is maintained at the current height, and the backrest adjustment is completed. Backrest lowering procedure: Apply a downward force to the backrest, the height of the backrest relative to the support part decreases, the moving frame moves in the opposite direction along the guide groove, and when the height of the backrest is adjusted to the specified position, remove the downward force. At this time, the spring torque of the constant force spring and the gravitational torque of the backrest are balanced, the backrest is maintained at the current height, and the backrest is adjusted upward.

[0025] Thanks to the aforementioned technical solution, a simple and intuitive adjustment method is provided. Users only need to apply external force upwards or downwards to the backrest to adjust it up or down, and it will automatically hover in the new position after the force is released. There is no need to memorize or learn complex adjustment methods, and stepless hovering can be achieved in any position. This avoids the hassle of finding gears or additional locking in traditional adjustment methods, making the adjustment process more natural and smooth, and improving the convenience and comfort of using the seat.

[0026] In summary, by adopting the above technical solution, the beneficial effects of this invention are as follows: by matching the spring torque of the constant force spring with the gravitational torque of the moving part, smooth movement of the moving part under external force and automatic stepless hovering after the force is released are achieved. Compared with traditional mechanisms that rely on gas springs or hydraulic rods and require two-hand operation and stiff adjustment, as well as prior solutions that require continuous force application or additional locking and can only be adjusted in steps, this technical solution solves the problems of cumbersome adjustment process and inability to achieve stepless hovering in the prior art. Users only need to apply external force to adjust the height of the moving part, and it stops when the force is released, without any additional locking operation. The adjustment process is smooth and continuous, greatly improving the convenience and comfort of use. Furthermore, by setting the drum horizontally and making the axis of the guide groove perpendicular to it, the lifting and hovering device can adapt to different installation angles and spatial layouts. By setting moving auxiliary structures on both sides of the moving frame and further optimizing them into ball bearing structures with side and bottom ball bearings, this application solves the industry problems of difficult backrest adjustment, cumbersome operation, and inability to achieve stepless hovering at any position in traditional technologies with a simplified adjustment structure. This greatly improves the comfort and convenience of users when using office chairs, medical care beds, and other equipment, and has broad practical value. Attached Figure Description

[0027] Figure 1 This is an exploded view of the hovering mechanism of the present invention; Figure 2 This is a schematic diagram of the lifting and hovering device of the present invention; Figure 3 This is a schematic diagram of the structure in which the moving part of the present invention is in a high position; Figure 4 This is a schematic diagram of the structure of the present invention with the moving part in a low position; Figure 5 This is a schematic diagram of the backrest of the present invention being in a high position; Figure 6 This is a schematic diagram of the backrest of the present invention in a low position; Figure 7 This is a schematic diagram of the adaptive adjustable lumbar support structure of the present invention; Figure 8 This invention relates to Figure 7 A magnified view of a portion of region A in the middle; Figure 9 This is a schematic diagram of the structure of the lumbar support body of the present invention; Figure 10 This is a schematic diagram of the structure of the lumbar support adjustment part. Figure 11 This is a cross-sectional view of the base adjustment assembly of the present invention; Figure 12 This is a cross-sectional view of the base adjustment component of the present invention adjusting the lumbar cushion body clockwise. Figure 13 This is a schematic diagram of the ball bearing arrangement method of the present invention; Figure 14 This is an assembly diagram of the hovering seat of the present invention.

[0028] The diagram shows the following markings: 10-moving part, 11-backrest, 111-upper backrest component, 112-lower backrest component, 1121-lumbar support body, 1122-lumbar support bracket, 1123-lumbar support adjustment part, 11232-middle elastic support component, 11233-side elastic support component, 113-buffer unit, 114-base adjustment assembly, 1141-circulating track, 11411-fixed part, 11412-extended part, 1142-bottom hinge component, 1143-top hinge component, 20-lifting and hovering device, 21-guide groove, 22-moving frame, 221-constant force spring, 222-rotating shaft, 223-drum, 224-buffer structure, 23-moving auxiliary structure, 231-elastic support structure, 232-ball bearing, 30-support part, 31-installation structure. Detailed Implementation

[0029] The present invention will now be described in detail with reference to the accompanying drawings.

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0031] Example 1 A hovering mechanism, such as Figures 1-4As shown, the device includes a support part 30 and a moving part 10. The moving part 10 is movably connected to the support part 30 via a lifting and hovering device 20. The lifting and hovering device 20 includes a matching guide groove 21 and a moving frame 22. A constant force spring 221 is mounted on the moving frame 22. The spring torque of the constant force spring 221 matches the gravitational torque of the moving part 10. The drum 223 of the constant force spring 221 is rotatably mounted on the moving frame 22 via a rotating shaft 222. The fixed end of the spring band in the constant force spring 221 is wound around the drum 223, and the free end of the spring band is connected to the moving part 10. The moving frame 20... 2. The guide groove 21 is assembled to the moving part 10, and the moving frame 22 can move along the guide groove 21. When the moving part 10 is not subjected to external force, the spring torque of the constant force spring 221 is balanced with the gravitational torque of the moving part 10, and the moving frame 22 remains stationary relative to the guide groove 21, thereby restricting the moving part 10 to its current position. When the moving part 10 is subjected to external force along the extension direction of the guide groove 21, the moving frame 22 changes position relative to the guide groove 21, and the spring band of the constant force spring 221 is pulled out or retracted from the drum 223, thereby changing the height of the moving part 10 relative to the support part 30. The upper top surface and lower bottom surface of the moving frame 22 are respectively provided with several protruding buffer structures 224, and the two end walls of the guide groove 21 in the length direction are provided with buffer grooves corresponding to the buffer structures 224 to avoid rigid collision between the moving frame 22 and the end of the guide groove 21 when it moves to the highest or lowest position. In this embodiment, the buffer structure 224 is preferably a rubber pad with a certain thickness and elasticity, such as a rubber pad or a polyurethane pad. Figure 2 As shown, two rubber pads are spaced apart on the top and bottom surfaces of the movable frame 22 to buffer and absorb the impact force generated when the movable frame 22 is raised or lowered to its limit position. When the movable part 10 moves the movable frame 22 to the top or bottom of the guide groove 21 under the action of external force, the buffer structure 224 first contacts the inner wall of the end of the guide groove 21. Through the elastic deformation of the buffer structure 224 itself, the impact kinetic energy is absorbed, thereby significantly reducing impact noise and improving user comfort.

[0032] like Figure 3 As shown, when the moving part 10 is in the high position, the spring band of the constant force spring 221 is pulled back and completely wound around the drum 223, and the moving frame 22 is located at the lowest point of the guide groove 21; as Figure 4 As shown, when the moving part 10 is in the low position, the free end of the spring band of the constant force spring 221 is pulled out, and the moving frame 22 is located at the highest point of the guide groove 21.

[0033] Specifically, by matching the spring torque of the constant force spring 221 with the gravitational torque of the moving part 10, when the moving part 10 is not subjected to external force, the spring torque and the gravitational torque are balanced, allowing the moving part 10 to hover at its current position; when an external force is applied, the moving part 10 moves along the guide groove 21, and the spring band is pulled out or pulled back, achieving height adjustment. This hovering mechanism has a simple structure, requires no additional locking device, and can achieve stepless hovering at any position simply by applying force. The adjustment process is smooth and without jamming, and the operation is convenient.

[0034] Understandably, the constant force spring 221 is characterized by its essentially constant elastic force within its working stroke, remaining unchanged regardless of variations in the stretching length. Utilizing this characteristic, when the gravitational torque of the moving part 10 matches the spring torque of the constant force spring 221, the two can achieve equilibrium at any position within the stroke range of the moving part 10. During use, the operator only needs to apply an external force to the moving part 10 to overcome this equilibrium, causing it to move; when the external force is removed, the torque balance is instantly restored, and the moving part 10 stably hovers in that position, requiring no manual locking or unlocking action throughout the entire process.

[0035] In other embodiments, the assembly positions of the guide groove 21 and the movable frame 22 can be interchanged. That is, the movable frame 22 is assembled on the movable part 10, the guide groove 21 is assembled on the support part 30, and the free end of the spring band is connected to the support part 30. The same hovering effect of the movable part 10 can be achieved. The principle is the same as above, and will not be repeated here.

[0036] like Figure 2 As shown, the guide groove 21 is an arc-shaped track, and the end of the arc-shaped track is bent towards the direction of the moving part 10; the drum 223 is horizontally arranged; the axial direction of the guide groove 21 is perpendicular to the axial direction of the drum 223, that is, the axial direction of the drum 223 is perpendicular to the axial direction of the moving part 10. Figure 1 The direction of movement is perpendicular.

[0037] Specifically, the guide groove 21 is an arc-shaped track, allowing the moving part 10 to move along the arc-shaped trajectory to adapt to different needs; the drum 223 is horizontally arranged and its axis is perpendicular to the guide groove 21, enabling the hovering mechanism to adapt to different installation angles and spatial layouts, while ensuring that the working direction of the constant force spring 221 matches the direction of gravity, ensuring the accuracy of torque balance and expanding the application range. It is understood that the guide groove 21 can also be set as a linear guide rail according to requirements; in this embodiment, an arc-shaped track is the preferred option for this technical solution.

[0038] It is understandable that setting the drum 223 horizontally and making the axis of the guide groove 21 perpendicular to it is to ensure that the pull-out direction of the spring band is always parallel to the extension direction of the guide groove 21, so that the force provided by the constant force spring 221 is used to balance the component of the gravity of the moving part 10 in that direction.

[0039] Three constant force springs 221 are arranged side by side in the middle of the movable frame 22. Mobility auxiliary structures 23 are provided on both sides of the movable frame 22 in the horizontal direction. The mobility auxiliary structures 23 are slidably connected to the guide grooves 21.

[0040] Specifically, three constant force springs 221 are arranged side by side in the middle of the moving frame 22, and a moving auxiliary structure 23 is set on both sides of the moving frame 22 and slidably connected to the guide groove 21. This allows multiple springs to evenly distribute the weight of the moving part 10, resulting in force balance and reducing the load on a single constant force spring 221. At the same time, the compact structural design reduces the overall volume and improves the stability and reliability of operation.

[0041] Understandably, when the moving part 10 is heavy, a single constant force spring 221 may not provide sufficient torque, or it may result in the constant force spring 221 being too large. By arranging multiple constant force springs 221 side by side, the total spring torque can be multiplied, easily handling moving parts 10 of varying weights. Simultaneously, placing the constant force springs 221 in the middle of the moving frame 22 ensures that the center of gravity is centered, and the moving auxiliary structures 23 on both sides are evenly stressed, effectively preventing the moving frame 22 from tilting or jamming during movement.

[0042] In other embodiments, the number of constant force springs 221 can be increased or decreased depending on the specific weight of the moving part 10 and the required adjustment force, and is not limited to three.

[0043] Each of the moving auxiliary structures 23 is provided with six rolling balls 232 with rolling surfaces protruding from the surface of the moving auxiliary structure 23, and the rolling balls 232 are in rolling connection with the guide groove 21.

[0044] Specifically, a ball bearing 232 with a protruding rolling surface is provided on the moving auxiliary structure 23, so that there is rolling friction between the moving auxiliary structure 23 and the guide groove 21, which significantly reduces the moving resistance, makes the adjustment operation easier and smoother, and at the same time reduces friction noise and wear, and extends the service life.

[0045] Understandably, rolling friction has a much lower coefficient of resistance than sliding friction. By incorporating ball bearings 232 into the moving auxiliary structure 23, the original sliding contact is transformed into rolling contact, which significantly reduces the driving force required for the moving frame 22 to move within the guide groove 21, thus improving operational sensitivity. Simultaneously, rolling friction generates less noise and produces less wear, contributing to long-term stability.

[0046] In other embodiments, the balls 232 can be made of wear-resistant and quiet materials, such as engineering plastics or balls 232 with a rubber coating, to further reduce noise. Furthermore, the number and arrangement density of the balls 232 can be optimized according to the length and stress conditions of the motion assist structure 23.

[0047] Each of the ball bearings 232 on the moving auxiliary structure 23 includes two side ball bearings that contact the side wall of the guide groove 21 and four bottom ball bearings that contact the bottom surface of the guide groove 21. One side ball bearing and two bottom ball bearings form a set of rolling support structures, and the two sets of rolling support structures are respectively located on both sides of the moving auxiliary structure 23 along its length. An elastic support structure 231 with the same protruding direction is also provided on the surface where the side ball bearings are located. The elastic support structure 231 is implemented by providing an interference fit convex surface on the moving auxiliary structure 23. Specifically, the elastic support structure 231 effectively eliminates the lateral gap between the moving frame 22 and the guide groove 21, preventing the moving part 10 from swaying or tilting during hovering or lifting, thereby maintaining long-term guiding accuracy and stable movement.

[0048] Specifically, the ball bearing 232 includes a side ball bearing that contacts the side wall of the guide groove 21 and a bottom ball bearing that contacts the bottom surface, which effectively reduces the friction between the moving frame 22 and the guide groove 21 during movement, ensuring the straightness and stability of the movement, and improving the accuracy of the hovering mechanism and the user experience.

[0049] Understandably, the side balls make rolling contact with the side wall of the guide groove 21, while the bottom balls make rolling contact with the bottom surface of the guide groove 21, enabling smooth up-and-down movement. The elastic support structure 231 mainly serves to limit movement and prevent the moving frame 22 from wobbling in the width direction. The combination of the balls 232 and the elastic support structure 231 ensures the accuracy and stability of the adjustment process.

[0050] In addition, such as Figure 13 As shown, a number of ball bearings 232 are also provided at the joint between the moving part 10 and the supporting part 30, which further eliminates the problem of poor moving experience caused by friction or excessive gap at the joint, and ensures smooth movement.

[0051] Example 2 A type of suspension backrest, such as Figure 5 and Figure 6As shown, the backrest 11 includes a backrest 11 and a support 30. The backrest 11 is movably mounted on the support 30 via a lifting adjustment device. The lifting adjustment device includes a matching guide groove 21 and a moving frame 22. A constant force spring 221 is mounted on the moving frame 22. The spring torque of the constant force spring 221 matches the gravitational torque of the backrest 11. The drum 223 of the constant force spring 221 is rotatably mounted on the moving frame 22 via a rotating shaft 222. The fixed end of the spring band in the constant force spring 221 is wound around the drum 223, and the free end of the spring band is connected to the backrest 11. The guide groove 21... 1. The movable frame 22 is mounted on the backrest 11 and the movable frame 22 is mounted on the support 30. The movable frame 22 can move along the guide groove 21. When the backrest 11 is not subjected to external force, the spring torque of the constant force spring 221 is balanced with the gravitational torque of the backrest 11, and the movable frame 22 remains stationary relative to the guide groove 21, thereby restricting the backrest 11 to the current position. When the backrest 11 is subjected to external force along the extension direction of the sliding track, the movable frame 22 moves along the guide groove 21, and the spring band of the constant force spring 221 is pulled out or pulled back from the drum 223, thereby changing the height of the backrest 11 relative to the support 30. In particular, compared to the problems of "the adjustment force increases as you go down" and "there is a pull-up force" caused by the use of ordinary springs in the prior application, the constant force spring 221 used in this application completely eliminates the pull-up force, so that the backrest 11 will not have an upward pull after displacement. Therefore, the adjustment force required by the user is greatly reduced and remains consistent no matter where the user adjusts, thus improving the comfort of use.

[0052] Specifically, through the cooperation of the guide groove 21, the movable frame 22, and the constant force spring 221, the gravitational torque of the backrest 11 is balanced with the spring torque, achieving stepless hovering of the backrest 11 at any height. Users only need to apply an upward or downward external force to the backrest 11 to adjust its height, and it will automatically hover after the force is released, without any additional operation. The adjustment process is smooth and silent, greatly improving the comfort and convenience of the seat, and overcoming the shortcomings of existing technologies where adjusting the backrest 11 is laborious, the operation is cumbersome, and stepless hovering is not possible.

[0053] Understandably, this solution applies the core principle of the aforementioned hovering mechanism to the backrest 11. When the user leans against or pulls the backrest 11, the external force disrupts the balance between the gravitational torque of the backrest 11 and the torque of the constant force spring 221, driving the moving frame 22 to move along the guide groove 21. When the backrest 11 reaches a comfortable position, the user only needs to remove the external force, and the torque balance is immediately restored, allowing the backrest 11 to hover stably. The entire process requires no learning of how to operate the switch or find the locking position.

[0054] In other embodiments, the hoverable backrest 11 can be applied not only to office chairs, but also to various devices that require backrest 11 angle or height adjustment, such as medical care beds and wheelchairs, and has broad application prospects.

[0055] The guide groove 21 is an arc-shaped track, the end of which is bent toward the backrest 11 to adapt to ergonomics and better fit the curve of the human back; the drum 223 is horizontally arranged; the axis of the guide groove 21 is perpendicular to the axis of the drum 223; three constant force springs 221 are arranged side by side in the middle of the movable frame 22, and the movable frame 22 has a moving auxiliary structure 23 on both sides in the horizontal direction, and the moving auxiliary structure 23 is slidably connected to the guide groove 21.

[0056] Specifically, this application employs an arc-shaped track and achieves force-driven suspension positioning through the matching of constant-force springs 221 and gravitational torque. When the user leans back, the friction between the backrest and the backrest 11 generates an adjustment force, allowing the backrest 11 to automatically and smoothly slide down the arc-shaped track according to the user's body posture. The movement trajectory of the backrest 11 is an arc adapted to the arc-shaped track. During the descent of the backrest 11, its lower part pushes out towards the lumbar spine, ensuring that the backrest 11 and the lumbar spine are always in the most effective contact state, effectively solving the problem of the waist easily being unsupported when leaning back in traditional seats. The roller 223 is horizontal and vertical in axis, and multiple constant-force springs 221 are arranged side by side, allowing the backrest 11 adjustment mechanism to adapt to different support structure 30 structures and ensuring balanced force and smooth adjustment, further improving the smoothness and reliability of adjustment.

[0057] In other embodiments, the number of constant force springs 221 arranged side by side can be set according to the weight of the backrest 11 and the desired adjustment feel. For example, for a lightweight backrest 11, one constant force spring 221 can be used; for a backrest 11 with higher load-bearing requirements, the number of constant force springs 221 can be increased.

[0058] The moving auxiliary structure 23 is provided with a plurality of rolling balls 232 with rolling surfaces protruding from the surface of the moving auxiliary structure 23. The rolling balls 232 are in rolling connection with the guide groove 21. The rolling balls 232 include a plurality of side rolling balls that contact the side wall of the guide groove 21 and a plurality of bottom rolling balls that contact the bottom surface of the guide groove 21.

[0059] Specifically, ball bearings 232, including side ball bearings and bottom ball bearings, are set on the movement auxiliary structure 23 to change the sliding friction of the backrest 11 into rolling friction, making the adjustment easier and smoother. At the same time, multi-directional limiting ensures the stability of the movement of the backrest 11, avoids multi-directional friction, and improves the smoothness of adjustment and long-term durability.

[0060] Example 3 A type of hovering seat, such as Figure 14 As shown, the chair includes the aforementioned hoverable backrest and a seat, wherein the hoverable backrest is mounted to the seat via a mounting structure 31.

[0061] Specifically, the suspension backrest and seat are combined to form a suspension seat, which enables the seat to have stepless height adjustment of the backrest 11. Users can easily adjust the height of the backrest 11 according to their own needs to obtain the best support, and no external force or additional operation is required to maintain the adjusted backrest 11 height. The overall structure is compact and easy to operate, which improves the ergonomic performance and user experience of the seat.

[0062] Understandably, when a user sits in this chair, they simply need to naturally lean their back against the backrest 11 and slightly move their body up or down to move the backrest 11 to a new height. Once the most comfortable support point is found, the body relaxes and leans back, and the backrest 11 automatically locks in that position, providing stable back support for the user. Especially during the reclining process, the backrest 11 can automatically adjust its position in real time according to the reclining angle and provide lumbar support, providing a comfortable experience for the user. This hovering chair also integrates headrests, armrests, and other components.

[0063] Example 4 A method for adjusting a hovering seat includes the following steps: Backrest 11 adjustment steps: Apply an upward external force to the backrest 11, the height of the backrest 11 relative to the chair frame increases, the sliding frame moves forward along the sliding guide rail, and when the height of the backrest 11 is adjusted to the specified position, remove the upward external force. At this time, the spring torque of the constant force spring 221 and the gravitational torque of the backrest 11 are balanced, the backrest 11 is maintained at the current height, and the backrest 11 is adjusted upward. Backrest 11 lowering steps: Apply a downward external force to backrest 11, the height of backrest 11 relative to the chair frame decreases, the sliding frame moves in the opposite direction along the sliding guide rail, and when the height of backrest 11 is adjusted to the specified position, remove the downward external force. At this time, the spring torque of constant force spring 221 is balanced with the gravitational torque of backrest 11, and backrest 11 remains at the current height, completing the upward adjustment of backrest 11.

[0064] Specifically, a simple and intuitive adjustment method is provided. Users only need to apply external force upwards or downwards to the backrest 11 to adjust it up or down, and it will automatically hover in the new position after the force is released. There is no need to memorize or learn complicated adjustment methods, and stepless hovering can be achieved in any position. This avoids the trouble of finding the gear or additional locking in traditional adjustment methods, making the adjustment process more natural and smooth, and improving the convenience and comfort of using the seat.

[0065] Understandably, the core of this method lies in utilizing the torque balance characteristics of the constant-force spring 221. When adjusting upwards, an upward external force assists in overcoming gravity, causing the spring band to be wound into the drum 223; when adjusting downwards, a downward external force overcomes the spring force, pulling the spring band out. The magnitude of the external force only needs to slightly disrupt the balance, making the adjustment process very effortless. The moment the force is released, the torque balance is automatically restored, achieving hovering.

[0066] Example 5 Example 5 is a further improvement on Example 3; further explanation: identical components will not be repeated here, such as... Figures 7-12 As shown, the backrest 11 is connected to one side of the seat via a mounting base. The mounting base includes a movable part 10 and a support part 30. The movable part 10 is movably mounted to the support part 30 via a lifting adjustment device. The support part 30 is connected to one side of the seat, and the backrest 11 is connected to the movable part 10.

[0067] The backrest 11 includes an upper backrest 111 and a lower backrest 112. The upper backrest 111 is disposed above the lower backrest 112. The lower backrest 112 includes a lumbar support. The lumbar support includes a lumbar support bracket 1122, a lumbar support adjustment part 1123, and a lumbar support body 1121. The lumbar support body 1121 is mounted on the lumbar support bracket 1122 via the lumbar support adjustment part 1123. The lumbar support adjustment part 1123 includes a central elastic support member 11232 and two lateral elastic support members. 11233, the intermediate elastic support 11232 is disposed above the side elastic support 11233, and the two side elastic support 11233 are symmetrically disposed on both sides of the intermediate elastic support 11232. The intermediate elastic support 11232 and the two side elastic support 11233 cooperate with each other to form a three-point support structure. The lumbar pad body 1121 is installed on the three-point support structure, and the central axis of the lumbar pad body 1121 matches the intermediate elastic support 11232.

[0068] Specifically, the lumbar support uses a central elastic support 11232 and two side elastic support 11233 to form a three-point support structure, which enables the seat to provide three-point differentiated support for the user's waist. When the user adjusts their posture, the three support points adapt to different degrees of elastic deformation according to the different forces, automatically adapting to the waist curve and improving user comfort. At the same time, the backrest 11 is divided into an upper backrest 111 and a lower backrest 112, so that the lumbar support and back support are relatively independent and do not interfere with each other, improving the overall comfort and adaptability of the seat.

[0069] Understandably, the upper backrest 111 primarily supports the user's upper back and shoulders, while the lower backrest 112 focuses on lumbar support. This partitioned design allows the upper and lower sections to be independently optimized according to ergonomic principles. When a user sits in the chair, their back is against the upper backrest 111, while their lower back is in contact with the lumbar support body 1121 of the lower backrest 112. The three-point support structure in the lumbar support body 1121 dynamically provides support based on the user's specific lumbar curve and real-time posture. Because lumbar support is independent of back support, when the user twists or turns their upper body, the lumbar support is not affected by the upper back, and vice versa, thus providing a more precise and comfortable support experience.

[0070] It also includes a base adjustment component 114, wherein the lumbar support bracket 1122 is assembled to the mounting base via the base adjustment component 114, and the base adjustment component 114 can act on the lumbar support bracket 1122 to change the position of the lumbar support body 1121 relative to the mounting base.

[0071] Specifically, by adding a base adjustment component 114, the lumbar support bracket 1122 can adjust its position relative to the mounting base, thereby changing the position and angle of the lumbar support body 1121 on the seat, meeting the personalized needs of different users for the position of the lumbar support, and improving the adjustment flexibility of the seat.

[0072] The base adjustment assembly 114 includes a circulation track 1141, which includes a fixed part 11411 and an extension part 11412. The extension part 11412 can reciprocate along the length of the circulation track 1141. The fixed part 11411 of the circulation track 1141 is rotatably connected to the mounting base. One end of the extension part 11412 is restricted to the fixed part 11411 along its length, and the other end extends out of the fixed part 11411 and is rotatably connected to the bottom of the lumbar support bracket 1122 via a bottom hinge 1142. The top of the lumbar support bracket 1122 is rotatably connected to the bottom of the upper backrest member 111 via a top hinge 1143. When an external force is applied to the lumbar support bracket 1122, the lumbar support bracket 1122 can rotate around the top hinge 1143 by changing the extension length of the extension part 11412 relative to the fixed part 11411.

[0073] Specifically, by setting up a circulating track 1141 and its fixing part 11411 and extension part 11412, and cooperating with a hinge connection, the lumbar support bracket 1122 can rotate around the top hinge 1143 to adjust the angle of the lumbar support, so that the lumbar support can always fit users of different body types, effectively improving the comfort and adaptability of the seat.

[0074] The bottom of the upper backrest 111 is fixedly connected to the mounting base, and the top of the upper backrest 111 is connected to the mounting base through the buffer unit 113.

[0075] Specifically, the bottom of the upper backrest 111 is fixed and the top is connected through the buffer unit 113, so that the upper backrest 111 has a certain elastic buffering capacity. When the user leans back, the buffer unit 113 can provide flexible support to reduce impact. At the same time, it works in conjunction with the lumbar support adjustment of the lower backrest 112 to further improve the comfort and dynamic response performance of the seat.

[0076] Understandably, the cushioning unit 113 can be a spring, sheet metal, or other similar element. When the user leans back, their back first contacts the upper backrest 111 and applies pressure. The top of the upper backrest 111 rotates backward or undergoes elastic deformation around its bottom fixing point. During this process, the cushioning unit 113 is compressed, absorbing energy and providing a reaction force. This design means that the upper backrest 111 is not completely rigidly fixed, but has a certain "breathing" space, providing an experience similar to "dynamic back support." At the same time, the lumbar support in the lower backrest 112 also independently adjusts its angle and support force adaptively. The two work together to allow the entire backrest 11 to more comprehensively and dynamically conform to and support the user's entire back.

[0077] The surfaces of the upper backrest 11 and the lower backrest 112 may be covered with high-elasticity mesh or sponge to further enhance the comfort and breathability of the back.

[0078] The intermediate elastic support 11232 and the lateral elastic support 11233 are both support springs. One end of the support spring along its elastic extension direction is connected to the lumbar support bracket 1122, and the other end is connected to the lumbar support body 1121.

[0079] Specifically, the elastic support component of the lumbar support is a support spring. The elastic deformation of the support spring can provide flexible support force, allowing the lumbar support body 1121 to elastically float according to the user's lumbar pressure, achieving adaptive cushioning. At the same time, the support spring has a simple structure, low cost, and is easy to install and maintain, making it suitable for seat products.

[0080] This document uses specific embodiments to illustrate the principles and implementation methods of the present invention. The descriptions of these embodiments are only intended to aid in understanding the method and core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0081] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed during use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0082] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

Claims

1. A hovering mechanism, comprising a support part and a moving part, characterized in that, The movable part is movably connected to the support part via a lifting and hovering device. The lifting and hovering device includes a matching guide groove and a movable frame. A constant force spring is mounted on the movable frame. The spring torque of the constant force spring matches the gravitational torque of the movable part. The drum of the constant force spring is rotatably mounted on the movable frame via a rotating shaft. The fixed end of the spring band in the constant force spring is wound around the drum, and the free end of the spring band is connected to the movable part / support part. The movable frame is mounted on the support part / movable part. The guide groove is mounted on the movable part / support part, and the movable frame can move along the guide groove. When the movable part is not subjected to external force, the spring torque of the constant force spring and the gravitational torque of the movable part remain balanced, and the movable frame remains stationary relative to the guide groove, thereby restricting the movable part to its current position. When the movable part is subjected to external force along the extension direction of the guide groove, the movable frame changes position relative to the guide groove, and the spring band of the constant force spring is pulled out or pulled back from the drum, thereby changing the height of the movable part relative to the support part.

2. The hovering mechanism as described in claim 1, characterized in that, The guide groove is an arc-shaped track, and the end of the arc-shaped track is bent toward the direction of the moving part; the drum is set horizontally; the axis of the guide groove is perpendicular to the axis of the drum.

3. The hovering mechanism as described in claim 1, characterized in that, Several constant force springs are arranged side by side in the middle of the movable frame, and movable auxiliary structures are respectively provided on both sides of the movable frame in the horizontal direction. The movable auxiliary structures are slidably connected to the guide groove.

4. The hovering mechanism as described in claim 3, characterized in that, The moving auxiliary structure is provided with a number of rolling balls with protruding surfaces, and the rolling balls are in rolling connection with the guide groove.

5. The hovering mechanism as described in claim 4, characterized in that, The ball bearings include a number of side balls that contact the sidewall of the guide groove and a number of bottom balls that contact the bottom surface of the guide groove; the surface on which the side balls are located is also provided with an elastic support structure in the same direction as their protrusion.

6. A hoverable backrest, comprising a backrest and a support portion, wherein the backrest is movably mounted to the support portion via a lifting and adjusting device, characterized in that, The lifting and adjusting device includes a matching guide groove and a movable frame. A constant force spring is mounted on the movable frame, and the spring torque of the constant force spring matches the gravitational torque of the backrest. The drum of the constant force spring is rotatably mounted on the movable frame via a rotating shaft. The fixed end of the spring band in the constant force spring is wound around the drum, and the free end of the spring band is connected to the backrest / support. The guide groove is mounted on the backrest / support, and the movable frame is mounted on the support / backrest. The movable frame can move along the guide groove. When the backrest is not subjected to external force, the spring torque of the constant force spring is balanced with the gravitational torque of the backrest, and the movable frame remains stationary relative to the guide groove, thereby restricting the backrest to its current position. When the backrest is subjected to external force along the extension direction of the sliding track, the movable frame moves along the guide groove, and the spring band of the constant force spring is pulled out or pulled back from the drum, thereby changing the height of the backrest relative to the support.

7. The hovering backrest as described in claim 6, characterized in that, The guide groove is an arc-shaped track, and the end of the arc-shaped track is bent toward the direction of the backrest; the axis of the guide groove is perpendicular to the axis of the drum; several constant force springs are arranged side by side in the middle of the movable frame, and the movable frame is provided with a moving auxiliary structure on both sides in the horizontal direction, and the moving auxiliary structure is slidably connected to the guide groove.

8. The hovering backrest as described in claim 7, characterized in that, The moving auxiliary structure is provided with a number of balls with rolling surfaces protruding from the surface of the moving auxiliary structure. The balls are in rolling connection with the guide groove. The balls include a number of side balls that contact the side wall of the guide groove and a number of bottom balls that contact the bottom surface of the guide groove. The side balls are also provided with an elastic support structure in the same direction as their protrusion on the surface.

9. A hovering seat, characterized in that, The device includes a hoverable backrest as described in any one of claims 6-8, and also includes a seat, wherein the hoverable backrest is mounted to the seat via a mounting structure.

10. A method for adjusting a hovering seat, applied to the hovering seat as described in claim 9, characterized in that, Includes the following steps: Backrest adjustment steps: Apply an upward force to the backrest, the height of the backrest relative to the support increases, the moving frame moves forward along the guide groove, and when the height of the backrest is adjusted to the specified position, remove the upward force. At this time, the spring torque of the constant force spring and the gravitational torque of the backrest are balanced, the backrest is maintained at the current height, and the backrest adjustment is completed. Backrest lowering procedure: Apply a downward force to the backrest, the height of the backrest relative to the support part decreases, the moving frame moves in the opposite direction along the guide groove, and when the height of the backrest is adjusted to the specified position, remove the downward force. At this time, the spring torque of the constant force spring and the gravitational torque of the backrest are balanced, the backrest is maintained at the current height, and the backrest is adjusted upward.

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