Seat back angle adjustment structure
Patent Information
- Application Number
- CN202522619705.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-10
- Publication Date
- 2026-10-13
- Estimated Expiration
- 2035-12-10
AI Technical Summary
现有的座椅的椅背角度调节装置多存在结构松散、回弹性不好、承载力不足的问题，而且部分椅背角度调节装置的传动部件暴露在外，易受灰尘、异物影响导致卡滞
[0015]本实用新型通过安装壳体将卷簧、回弹拉簧集成为一体，相比传统分散式弹簧固定方式，减少了独立部件数量，节约安装空间，提高装配效率，同时避免了弹簧移位导致的复位故障。
Smart Images
Figure CN224845257U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of seat adjustment devices, specifically to a seat back angle adjustment structure. Background Technology
[0002] The backrest angle adjustment device is installed at the bottom of the seat body and is used to adjust the backrest tilt angle. Existing seat backrest angle adjustment devices often suffer from loose structure, poor resilience, and insufficient load-bearing capacity. Moreover, the transmission components of some backrest angle adjustment devices are exposed and are easily affected by dust and foreign objects, causing them to jam. Utility Model Content
[0003] To solve the above technical problems, a chair back angle adjustment structure with a compact structure and good load-bearing capacity is provided.
[0004] To achieve the above objectives, the technical solution adopted by this utility model is: a chair back angle adjustment structure, comprising,
[0005] The mounting housing has an internal angle adjustment mechanism, which includes an adjustment gear and a meshing toothed plate. A first connecting post is formed on the surface of the toothed plate, penetrating the mounting housing. A coil spring is fixedly connected to the outside of the mounting housing, with its free end fixedly connected to the first connecting post to provide preload for backrest reset. A second and third connecting post are integrally formed on the other side of the mounting housing, with both ends of a spring connected to the second and third connecting posts respectively. A handle fixing plate is hinged to this side of the mounting housing, with a clearance opening at a corresponding position for the second connecting post to pass through and be exposed. The third connecting post is located on one side of the handle fixing plate.
[0006] The first adjustment part is fixedly connected at one end to the mounting housing and at the other end to the seat back; the first adjustment part is connected to the toothed plate through a fastener.
[0007] The second adjustment part is fixedly connected to the seat base at one end and to the adjustment gear at the other end, and the two remain relatively stationary.
[0008] Pressure is applied to the first adjustment part, which drives the toothed plate to mesh with the adjustment gear, changing the angle between the first and second adjustment parts and locking the adjustment angle, that is, changing the backrest tilt angle; when the backrest needs to be restored, the handle fixing plate is rotated around its hinge point with the mounting housing, thereby pulling the third connecting column to move closer to the second connecting column. The tension of the return spring drives the mounting housing and the toothed plate to move in the opposite direction, so that the toothed plate disengages from the adjustment gear. At the same time, the preload of the coil spring is released, and together they drive the backrest to return to the initial position.
[0009] According to this utility model, the second adjusting part is further connected coaxially with the adjusting gear via a rotating shaft.
[0010] According to this utility model, further, a limiting hole is provided on the surface of the toothed plate, and the curvature of the limiting hole is adapted to the meshing transmission path of the toothed plate relative to the adjusting gear; an opening is also provided at the corresponding position of the mounting housing, one end of the connecting plate is fixedly fitted on the outer circumference of the rotating shaft, and the other end is inserted into the limiting hole through the connecting piece. The limiting hole provides the swing path for the first adjusting part and limits the maximum adjustment range of the first adjusting part.
[0011] According to this utility model, further, one side of the toothed plate has meshing teeth that mesh with the adjusting gear.
[0012] According to this utility model, the inner diameter of the coil spring is interference-fitted with the outer diameter of the rotating shaft.
[0013] According to this utility model, the toothed plate is further described as an integrally formed powder metallurgy part.
[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0015] This invention integrates the coil spring and the rebound spring into one unit by installing a housing. Compared with the traditional decentralized spring fixing method, it reduces the number of independent parts, saves installation space, improves assembly efficiency, and avoids reset failure caused by spring displacement.
[0016] This invention combines the preload of the coil spring with the auxiliary rebound of the return spring to achieve smooth reset and stable locking after the chair back angle is adjusted.
[0017] This invention reduces the number of connecting parts and connection points by forming a second and a third connecting post on one side surface of the mounting housing, thereby improving the overall load-bearing capacity. Attached Figure Description
[0018] Figure 1 This is a first-view structural schematic diagram of the chair back angle adjustment structure of this utility model;
[0019] Figure 2 This is a second-view structural diagram of the chair back angle adjustment structure of this utility model.
[0020] Figure 3 This is an exploded view of the chair back angle adjustment structure of this utility model.
[0021] Figure 4 This is a schematic diagram of the toothed plate structure of this utility model. Detailed Implementation
[0022] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.
[0023] As shown in the figure, this application discloses a chair back angle adjustment structure, including a mounting housing 100, a first adjustment part 200 fixedly connected to the outside of the mounting housing 100, and the other end of the first adjustment part 200 fixedly connected to the chair back; an angle adjustment mechanism is provided inside the mounting housing 100, and one end of the second adjustment part 300 fixedly connected to the seat base is coupled to the angle adjustment mechanism.
[0024] The angle adjustment mechanism includes an adjusting gear 400 coaxially connected to the second adjusting part 300 via a rotating shaft 600 and a toothed plate 500 meshing with the adjusting gear 400. The adjusting gear 400 remains stationary with the second adjusting part 300. The toothed plate 500 is fixed inside the mounting housing 100 and connected to the first adjusting part 200. One side of the toothed plate 500 has meshing teeth that mesh with the adjusting gear 400. When pressure is applied to the first adjusting part 200, the first adjusting part 200 drives the toothed plate 500 to mesh with the adjusting gear 400, changing the angle between the first adjusting part 200 and the second adjusting part 300 and locking the adjustment angle, i.e., changing the backrest tilt angle of the chair.
[0025] The toothed plate 500 has a first connecting post 510 penetrating the mounting housing 100 on its surface. A coil spring 700 is fixedly fitted to one end of the rotating shaft 600 located outside the mounting housing 100. The free end of the coil spring 700 is fixedly connected to the first connecting post 510 to provide preload for backrest reset. Preferably, the inner diameter of the coil spring 700 is interference-fitted with the outer diameter of the rotating shaft 600 to ensure stable transmission of preload. Preferably, the toothed plate 500 is made of one-piece powder metallurgy, which improves its rigidity and the load-bearing capacity of the backrest.
[0026] The toothed plate 500 also has a limiting hole 520 on its surface. The limiting hole 520 is an arc-shaped elongated hole, and its curvature is adapted to the meshing transmission path of the toothed plate 500 relative to the adjusting gear 400. The corresponding position of the mounting housing 100 also has an opening. One end of the connecting plate 1000 is fixedly fitted on the outer circumference of the rotating shaft 600, and the other end is inserted into the limiting hole 520 through a pin. The limiting hole 520 provides a swing path for the first adjusting part 200 and limits the maximum adjustment range of the first adjusting part 200.
[0027] On the other side surface of the mounting housing 100, a second connecting post 110 and a third connecting post 120 are integrally formed. The two ends of the rebound spring 800 are connected to the second connecting post 110 and the third connecting post 120, respectively. A handle fixing plate 900 is hinged to this side surface of the mounting housing 100. The handle fixing plate 900 has a clearance opening at a corresponding position for the second connecting post 110 to pass through and be exposed. The third connecting post 120 is located on one side of the handle fixing plate 900. Initially, the rebound spring 800 is in a pre-tensioned state. When the chair back needs to be restored, pull the operating handle. The handle drives the handle fixing plate 900 to rotate around the hinge point between it and the mounting housing 100, thereby pulling the third connecting column 120 to move closer to the second connecting column 110. The tension of the return spring 800 drives the mounting housing 100 and the toothed plate 500 to move in the opposite direction, so that the engagement between the toothed plate 500 and the adjusting gear 400 is disengaged. At the same time, the preload of the coil spring 700 is released, which together drive the chair back to return to the initial position.
[0028] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A backrest angle adjustment structure, characterized in that, include, The mounting housing has an internal angle adjustment mechanism, which includes an adjustment gear and a meshing toothed plate. A first connecting post is provided on the surface of the toothed plate, penetrating the mounting housing. A coil spring is fixedly connected to the outside of the mounting housing, with its free end fixedly connected to the first connecting post to provide preload for backrest reset. A second and third connecting post are integrally formed on the other side surface of the mounting housing, with both ends of a rebound spring connected to the second and third connecting posts respectively. A handle fixing plate is hinged to this side surface of the mounting housing, with a clearance opening at a corresponding position for the second connecting post to pass through and be exposed. The third connecting post is located on one side of the handle fixing plate. The first adjustment part is fixedly connected at one end to the mounting housing and at the other end to the seat back; the first adjustment part is connected to the toothed plate through a fastener. The second adjustment part is fixedly connected to the seat base at one end and to the adjustment gear at the other end, and the two remain relatively stationary. Pressure is applied to the first adjustment part, which drives the toothed plate to mesh with the adjustment gear, changing the angle between the first and second adjustment parts and locking the adjustment angle, that is, changing the backrest tilt angle; when the backrest needs to be restored, the handle fixing plate is rotated around its hinge point with the mounting housing, thereby pulling the third connecting column to move closer to the second connecting column. The tension of the return spring drives the mounting housing and the toothed plate to move in the opposite direction, so that the toothed plate disengages from the adjustment gear. At the same time, the preload of the coil spring is released, and together they drive the backrest to return to the initial position.
2. The chair back angle adjustment structure as described in claim 1, characterized in that, The second adjustment part is coaxially connected to the adjustment gear via a rotating shaft.
3. The chair back angle adjustment structure as described in claim 2, characterized in that, The toothed plate has a limiting hole on its surface. The curvature of the limiting hole is adapted to the meshing transmission path of the toothed plate relative to the adjusting gear. The corresponding position of the mounting housing also has an opening. One end of the connecting plate is fixedly fitted onto the outer circumference of the rotating shaft, and the other end is inserted into the limiting hole through a connector. The limiting hole provides a swing path for the first adjusting part and limits the maximum adjustment range of the first adjusting part.
4. The backrest angle adjustment structure as described in claim 1, characterized in that, One side of the toothed plate has meshing teeth that mesh with the adjusting gear.
5. The backrest angle adjustment structure as described in claim 1, characterized in that, The inner diameter of the coil spring is interference-fitted with the outer diameter of the rotating shaft.
6. The backrest angle adjustment structure as described in claim 1, characterized in that, The toothed plate is a one-piece molded powder metallurgy part.