Self-adapting elastic waist support mechanism and seat
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG ANJI XIANGTAI FURNITURE
- Filing Date
- 2025-09-29
- Publication Date
- 2026-07-14
Smart Images
Figure CN224483457U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of seating, and in particular to an adaptive elastic lumbar support mechanism and a seat. Background Technology
[0002] To accommodate changes in the forward and backward position of the human body's waist, most chairs on the market are equipped with an elastic lumbar support mechanism. The elastic lumbar support mechanism usually includes a fixed seat on the backrest and a sliding seat connected to the lumbar support. The sliding seat and the fixed seat are slidably connected in the forward and backward direction. At the same time, a spring is also provided between the sliding seat and the connecting seat so that when the human body's waist rests on the lumbar support, the spring can elastically deform and provide elastic support to the waist.
[0003] like Figure 9 As shown, some elastic lumbar support mechanisms have a fixed seat 3 set as a sleeve structure, and a sliding seat 4 connected to the lumbar support 2 is slidably connected inside the sleeve. At the same time, a spring 5 acting on the sliding seat is set inside the sleeve. However, most of the sliding seats 4 are matched and slidably installed inside the sleeve. This means that the sliding seat 4 is almost completely in contact with the inner wall of the sleeve. The sliding seat 4 only has the freedom to slide in the front and back direction to ensure its accurate guidance. However, such a design has shortcomings.
[0004] First, when a person leans back against the lumbar support, their position is random. The initial position of the lower back does not perfectly correspond to the position of the sliding seat, causing the sliding seat to have difficulty sliding smoothly backward after the lumbar support is under pressure. For example, if the sliding seat is located in the middle of the back of the lumbar support, but the lower back is leaning against the upper part of the lumbar support, there is a certain distance between the lower back and the sliding seat. This will cause the lumbar support to generate a rotational torque on the sliding seat, causing the sliding seat to compress the inner wall of the sleeve, which can easily lead to jamming. This makes it difficult for the spring to deform and provide elastic support to the lower back. Even if it does not jam, the friction between the sliding seat and the sleeve will increase, making the sliding seat less smooth and even generating more noise, affecting the user experience of the seat. Summary of the Invention
[0005] This utility model provides an adaptive elastic lumbar support mechanism and a seat. By leaving a gap between the sliding mating part and the sleeve part, a certain adaptive adjustment space is provided for the sliding mating part in the guide hole. This allows the lumbar support to swing under force and slide smoothly backward after swinging. This avoids the sliding mating part forming a large squeezing force on the inner wall of the guide hole, reduces the risk of jamming when the lumbar support slides, and improves the user experience of the seat.
[0006] The technical solution of this utility model is implemented as follows:
[0007] An adaptive elastic lumbar support mechanism and seat include a base and a lumbar support. An elastic element is provided between the base and the lumbar support, which can force the lumbar support to always have a forward tendency. An adaptive guide structure is provided between the base and the lumbar support. The adaptive guide structure includes a sleeve portion provided on one of the base and the lumbar support, and a sliding engagement portion provided on the other of the base and the lumbar support. The inner hole of the sleeve portion is a guide hole extending front and back. The sliding engagement portion is inserted into the guide hole and forms a front and back sliding connection with the sleeve portion. A gap is left between the outer wall of the sliding engagement portion and the inner wall of the guide hole to allow the lumbar support to adaptively swing when subjected to a backward leaning force, so that the lumbar support can smoothly approach the base and trigger the deformation of the elastic element.
[0008] Preferably, the cross-sectional area of the sliding fit is smaller than the cross-sectional area of the guide hole, so as to form the gap between the outer wall of the sliding fit and the inner wall of the guide hole.
[0009] Preferably, in the initial state, the left and right sides of the sliding mating part are in contact with the inner wall of the guide hole, while the upper and lower ends of the sliding mating part are separated from the inner wall of the guide hole, thereby forming the gap on the upper and lower sides of the sliding mating part; or, in the initial state, the upper and lower sides of the sliding mating part are in contact with the inner wall of the guide hole, while the left and right ends of the sliding mating part are separated from the inner wall of the guide hole, thereby forming the gap on the left and right sides of the sliding mating part.
[0010] Preferably, in the initial state, the outer wall of the sliding mating part does not contact the inner wall of the guide hole, thereby forming an annular gap; this allows the sliding mating part and the lumbar support connected to the sliding mating part to achieve adaptive swinging in both the up-down and left-right directions, improving the smoothness of the lumbar support sliding backward.
[0011] Preferably, the width of the gap is in the range of 0.5mm-3mm.
[0012] Preferably, the sleeve is located at the front end of the base, and the sliding fit is located at the rear end of the waist support.
[0013] Preferably, the elastic element is a compression spring disposed in the guide hole and acting on the sliding mating part; the compression spring is built into the guide hole, making the lumbar support mechanism structure simpler and more compact.
[0014] Preferably, a limiting protrusion is provided on the inner wall of the guide hole, and a limiting groove extending forward and backward is provided on the sliding mating part. The limiting protrusion is slidably connected in the limiting groove. The rear end of the limiting strip groove has a limiting end face. In the initial state, the limiting protrusion abuts against the limiting end face to prevent the sliding mating part from dislodging forward from the guide hole.
[0015] Preferably, the elastic element is in a pre-deformed state and forms a pre-tightening force on the sliding fit; the pre-tightening force forces the limiting protrusion to abut against the limiting end face, preventing the sliding fit from accidentally swinging and causing the gap to close.
[0016] A seat includes a backrest and the aforementioned adaptive elastic lumbar support mechanism; the adaptive elastic lumbar support mechanism is disposed on the backrest.
[0017] The beneficial effects of this utility model, which adopts the above technical solution, are as follows:
[0018] This invention sets the sliding mating part and the sleeve part to a clearance fit. The existence of the clearance increases the position adjustment space of the lumbar support. When the lumbar support is subjected to a backward leaning force and the leaning position does not correspond to the position of the sliding mating part, the adjustment space can also allow the lumbar support to produce an adaptive position swing, avoiding large squeezing force between the sliding mating part and the guide hole. This allows the lumbar support to slide smoothly backward after swinging and trigger the deformation of the elastic element, reducing the risk of jamming when the lumbar support moves backward and improving the user experience of the seat.
[0019] In the initial state, the elastic element is in a pre-deformed state and generates an elastic preload, causing the limiting protrusion to abut against the limiting end face to maintain the gap between the outer wall of the sliding fit and the inner wall of the guide hole, thus preventing the gap from closing due to accidental force on the lumbar support; at the same time, due to the existence of the elastic preload, even if the lumbar support swings unexpectedly, the elastic preload can force the lumbar support to return to the initial position, preventing the gap from closing and ensuring that the lumbar support can swing normally and adjust its position after being subjected to force. Attached Figure Description
[0020] Figure 1 A schematic diagram of the adaptive elastic lumbar support mechanism mounted on the chair back.
[0021] Figure 2 An enlarged view of the position of the adaptive elastic lumbar support mechanism;
[0022] Figure 3 An exploded view of the adaptive elastic lumbar support mechanism;
[0023] Figure 4 An exploded view of the adaptive elastic lumbar support mechanism from another angle;
[0024] Figure 5 This is a cross-sectional view showing the initial state with a gap between the sliding fit and the guide hole.
[0025] Figure 6 A cross-sectional view of the lumbar support tilting to adaptively adjust its position after being subjected to an external force;
[0026] Figure 7 A cross-sectional view showing the sliding fit adjusting backward and causing the compression spring to deform.
[0027] Figure 8 This is a diagram showing the gap structure formed between the sliding fit and the inner wall of the guide hole.
[0028] Figure 9 This is a simplified schematic diagram illustrating the fit between the sliding seat and the inner wall of the sleeve in the background art.
[0029] The attached figures are labeled as follows: 1-backrest, 11-base, 12-rear positioning hole, 2-lumbar support, 21-mounting seat, 22-lumbar support plate, 23-lumbar pad, 24-limiting component, 25-elastic protrusion, 231-strip clearance groove, 232-vertical guide groove, 41-plug connector, 42-limiting groove, 43-vertical guide strip, 44-front positioning hole, 3-sleeve part, 31-guide hole, 32-limiting protrusion, 4-sliding mating part, 5-compression spring, s-clearance. Detailed Implementation
[0030] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.
[0031] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.
[0032] The specific embodiments of this utility model are as follows:
[0033] like Figure 1-8 As shown, this embodiment provides an adaptive elastic lumbar support mechanism, including a base 11 and a lumbar support 2. An elastic element is provided between the base 11 and the lumbar support 2, which can force the lumbar support 2 to always have a forward tendency, so as to form elastic lumbar support. An adaptive guide structure is provided between the base 11 and the lumbar support 2. The adaptive guide structure includes a sleeve part 3 provided on one of the base 11 and the lumbar support 2, and a sliding engagement part 4 provided on the other of the base 11 and the lumbar support 2. The inner hole of the sleeve part 3 is a guide hole 31 extending back and forth. The sliding engagement part 4 is inserted into the guide hole 31 and forms a back-to-back sliding connection with the sleeve part 3. In this embodiment, the sleeve part 3 is provided at the front end of the base 11, and the sliding engagement part 4 is provided at the rear end of the lumbar support 2. The following explanation will be provided. Figure 5-7 As shown, a gap s is left between the outer wall of the sliding fit part 4 and the inner wall of the guide hole 31 to allow the lumbar support 2 to self-adaptively swing when subjected to a backward leaning force, so that the lumbar support 2 can smoothly approach the base 11 and trigger the deformation of the elastic element.
[0034] Furthermore, the elastic element can be a tension spring or a compression spring 5. In this embodiment, the elastic element is preferably a compression spring 5. The compression spring 5 is disposed in the guide hole 31 and acts on the sliding fit part 4. Specifically, the sleeve part 3 installed on the base 11 is through the front and rear. A rear positioning hole 12 is provided on the base 11 at the position corresponding to the guide hole 31, and a corresponding front positioning hole 44 is provided at the rear end of the sliding fit part 4. The front and rear ends of the compression spring 5 are respectively locked in the front positioning hole 44 and the rear positioning hole 12 to ensure that the compression spring 5 can elastically deform in the front and rear direction as much as possible without bending. The compression spring 5 is built into the guide hole 31, and while forming a forward elastic force on the sliding fit part 4, the compression spring 5 itself will not be exposed, making the lumbar support mechanism structure simpler and more compact.
[0035] Furthermore, in this embodiment, the cross-sectional shapes of the guide hole 31 and the sliding fit part 4 are basically matched. For example, the cross-sectional shape of the guide hole 31 can be any one of a circle, polygon, ellipse, or irregular shape, and the cross-sectional shape of the sliding fit part 4 matches the cross-sectional shape of the guide hole 31. In this embodiment, the cross-sectional shape of the guide hole 31 is explained as a quadrilateral. The formation of the gap s means that the cross-sectional area of the sliding fit part 4 is smaller than the cross-sectional area of the guide hole 31, so that the gap s is formed between the outer wall of the sliding fit part 4 and the inner wall of the guide hole 31. In this embodiment, the structure of the gap s has multiple implementations, such as... Figure 8 As shown, for example, in the initial state, the left and right sides of the sliding engagement part 4 are in contact with the inner wall of the guide hole 31, while the upper and lower ends of the sliding engagement part 4 are separated from the inner wall of the guide hole 31, thereby forming the gap s on the upper and lower sides of the sliding engagement part 4. This allows the lumbar support 2 to swing adaptively only in the vertical direction, suitable for application environments where the position of the waist and the lumbar support 2 is offset vertically from the position of the sliding engagement part 4; or, in the initial state, the upper and lower sides of the sliding engagement part 4 are in contact with the inner wall of the guide hole 31, while the left and right ends of the sliding engagement part 4 are separated from the inner wall of the guide hole 31, thereby forming the gap s on the left and right sides of the sliding engagement part 4. This allows the lumbar support 2 to swing adaptively only in the vertical direction, suitable for application environments where the position of the waist and the lumbar support 2 is offset vertically from the position of the sliding engagement part 4. The direction can be adaptively oscillating to suit application environments where the position of the waist and the lumbar support 2 is offset from the position of the sliding mating part 4. Alternatively, to further improve the smoothness of the sliding of the lumbar support 2, in the initial state, the outer wall of the sliding mating part 4 and the inner wall of the guide hole 31 can be completely non-contacting, thereby forming an annular gap s. In this way, whether the position of the waist leaning back on the lumbar support 2 is offset longitudinally or laterally, the sliding mating part 4 and the lumbar support 2 connected to the sliding mating part 4 can adaptively oscillate in both the up-down and left-right directions through the annular gap s, thereby improving the smoothness of the lumbar support 2 sliding backward.
[0036] Furthermore, in this embodiment, the width of the gap s needs to be within a reasonable range to ensure the normal use of the lumbar support mechanism. When the gap s is too small, the lumbar support 2 will not be able to swing sufficiently, which may cause jamming. When the gap s is too large, the lumbar support 2 will easily deflect significantly and separate from the waist when the waist is leaning against it, making it unusable. Therefore, considering the above factors, in this embodiment, the width of the gap s is set to 0.5mm-3mm.
[0037] Furthermore, such as Figure 2-4 As shown, to prevent the sliding mating part 4 from dislodging forward from the guide hole 31, a limiting protrusion 32 is provided on the inner wall of the guide hole 31, and a limiting groove 42 extending forward and backward is provided on the sliding mating part 4. The limiting groove 42 is located at the upper end of the sliding mating part 42; the limiting groove 42 and the limiting protrusion 32 are arranged symmetrically on the left and right; the limiting protrusion 32 is slidably connected in the limiting groove 42; the rear end of the limiting groove has a limiting end face 45. In the initial state, the limiting protrusion 32 abuts against the limiting end face 45, so that the forward and backward sliding distance of the sliding mating part 4 is within a reasonable range.
[0038] Furthermore, taking the gap s located at the upper and lower ends of the sliding fit part 4 as an example, in the initial state, due to the existence of the gap s, the sliding fit part 4 is easily in a drooping state under its own weight. This would cause the gap s at the lower end of the sliding fit part 4 to close, affecting the deflection of the lumbar support 2 after being subjected to force. Therefore, in this embodiment, in the initial state, the elastic element of the lumbar support 2 is in a pre-deformed state and forms a pre-tightening force on the sliding fit part 4. The pre-tightening force forces the limiting protrusion 32 to abut against the limiting end face 45 to maintain the existence of the corresponding gap s and prevent the sliding fit part 4 from accidentally deflecting and causing the gap s to close. This allows the lumbar support 2 to deflect normally after being subjected to force.
[0039] Furthermore, the structure of the lumbar support 2 is as follows: The lumbar support 2 includes a mounting base 21, which is a shell-shaped structure with an opening at the front end. A lumbar support plate 22 is installed at the opening, and a flexible lumbar pad 23 is fixed to the front side of the lumbar support plate 22. The rear end of the mounting base 21 is slidably connected to the sliding mating part 4 in the longitudinal direction, so that the lumbar support 2 can be raised and lowered and stop at a predetermined position.
[0040] Specifically, the mounting base 21 is provided with a limiting member 24, and the mounting base 21 is provided with symmetrical through-type strip-shaped clearance grooves 231 extending longitudinally on both sides; the front end of the sliding mating part 4 is provided with a protruding insertion part 41, which is inserted into the corresponding strip-shaped clearance groove 231 and fixedly connected to the limiting member 24, so that the mounting base 21 can be raised and lowered between the limiting member 24 and the sliding mating part 4; at the same time, in order to guide the raising and lowering of the mounting base 21, a concave vertical guide groove 232 is provided on the rear side of the mounting base 21, and the sliding mating part 4 is provided with a corresponding vertical guide strip 43, which guides the vertical... The guide bar 43 is slidably connected in the vertical guide groove 232; a stop structure is provided between the limiting member 24 and the mounting base 21. The stop structure includes a slot on the limiting member 24 and multiple elastic protrusions 25 spaced vertically on the mounting base 21; the elastic protrusions 25 are integrally formed with the mounting base 5; when the lumbar support 2 moves up and down, the corresponding elastic protrusions 25 elastically deform and the slot corresponds to one of the elastic protrusions 25 and the other elastic protrusion 25. When the lumbar support 2 moves up and down to the correct position, the corresponding elastic protrusions 25 are engaged in the slot, so that the lumbar support 2 is held in the predetermined position.
[0041] Furthermore, a seat is provided, including a backrest 1 and the aforementioned adaptive elastic lumbar support mechanism; the adaptive elastic lumbar support mechanism is disposed on the backrest 1; specifically, the backrest 1 includes a back support and a backrest disposed on the front side of the back support, and the base 11 can be disposed on the backrest or on the back support, so that the seat has an elastic lumbar support function.
[0042] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.
Claims
1. An adaptive elastic lumbar support mechanism, characterized in that, The device includes a base (11) and a lumbar support (2). An elastic element is provided between the base (11) and the lumbar support (2), which can force the lumbar support (2) to always have a forward tendency. An adaptive guide structure is provided between the base (11) and the lumbar support (2). The adaptive guide structure includes a sleeve part (3) provided on one of the base (11) and the lumbar support (2) and a sliding fit part (4) provided on the other of the base (11) and the lumbar support (2). The inner hole of the sleeve part (3) is a guide hole (31) extending back and forth. The sliding fit part (4) is inserted into the guide hole (31) and forms a back-to-back sliding connection with the sleeve part (3). A gap (s) is left between the outer wall of the sliding fit part (4) and the inner wall of the guide hole (31) to allow the lumbar support (2) to adaptively swing when subjected to a backward leaning force, so that the lumbar support (2) can smoothly approach the base (11) and trigger the deformation of the elastic element.
2. The adaptive elastic lumbar support mechanism according to claim 1, characterized in that: The cross-sectional area of the sliding fit part (4) is smaller than the cross-sectional area of the guide hole (31) so as to form the gap (s) between the outer wall of the sliding fit part (4) and the inner wall of the guide hole (31).
3. The adaptive elastic lumbar support mechanism according to claim 1, characterized in that: In the initial state, the left and right sides of the sliding fit part (4) are in contact with the inner wall of the guide hole (31), while the upper and lower ends of the sliding fit part (4) are separated from the inner wall of the guide hole (31), thereby forming the gap (s) on the upper and lower sides of the sliding fit part (4); or, in the initial state, the upper and lower sides of the sliding fit part (4) are in contact with the inner wall of the guide hole (31), while the left and right ends of the sliding fit part (4) are separated from the inner wall of the guide hole (31), thereby forming the gap (s) on the left and right sides of the sliding fit part (4).
4. The adaptive elastic lumbar support mechanism according to claim 1, characterized in that: In the initial state, the outer wall of the sliding fit part (4) does not contact the inner wall of the guide hole (31), thereby forming an annular gap (s).
5. The adaptive elastic lumbar support mechanism according to any one of claims 1-4, characterized in that: The width of the gap (s) ranges from 0.5mm to 3mm.
6. The adaptive elastic lumbar support mechanism according to claim 1, characterized in that: The sleeve part (3) is located at the front end of the base (11), and the sliding fit part (4) is located at the rear end of the waist support (2).
7. The adaptive elastic lumbar support mechanism according to claim 6, characterized in that: The elastic element is a compression spring (5) installed in the guide hole (31) and acting on the sliding fit part (4).
8. The adaptive elastic lumbar support mechanism according to claim 6, characterized in that: The guide hole (31) has a limiting protrusion (32) on its inner wall and a limiting groove (42) extending forward and backward on its sliding mating part (4). The limiting protrusion (32) is slidably connected in the limiting groove (42). The rear end of the limiting strip groove has a limiting end face (45). In the initial state, the limiting protrusion (32) abuts against the limiting end face (45).
9. The adaptive elastic lumbar support mechanism according to claim 8, characterized in that: In the initial state, the elastic element is in a pre-deformed state and forms a pre-tightening force on the sliding fit part (4); the pre-tightening force forces the limiting protrusion (32) to abut against the limiting end face (45) to prevent the sliding fit part (4) from swinging unexpectedly and causing the gap (s) to close.
10. A type of seat, characterized in that, It includes a chair back (1) and the adaptive elastic lumbar support mechanism as described in claim 1; the adaptive elastic lumbar support mechanism is disposed on the chair back (1).