Linkage mechanism for automatically adjusting seat back of chair

Abstract

The utility model discloses a linkage mechanism for automatically adjusting the seat back of a chair, which comprises a supporting part and a chair seat which are matched with each other, the end part of the supporting part is rotatably provided with a chair back component, a cavity of the supporting part is internally provided with a linkage mechanism and an elastic mechanism, and the linkage mechanism is used for realizing the interaction between the chair seat and the chair back component. According to the automatic linkage mechanism of the chair seat and the chair back, the angle of the chair back assembly can be synchronously adjusted by any pressing change of the chair seat, so that a comfortable sitting posture and back support are maintained, and the chair is convenient to use. And the design ensures the close fit between the chair seat and the chair back assembly, and continuous and smooth adjustment experience is provided.

Description

Technical Field

[0001] This utility model belongs to the field of seat technology, and in particular relates to a linkage mechanism for automatic adjustment of seat back. Background Technology

[0002] In modern furniture design, the comfort and functionality of chairs are receiving increasing attention, especially in the design of office chairs and lounge chairs. To improve the user's comfort experience, the function of automatically adjusting the backrest has become particularly important. This demand has driven the development of linkage mechanism technology, which can automatically adjust the angle of the backrest to adapt to different users' body shapes and sitting postures, thereby providing better support and comfort.

[0003] Traditional chair adjustment mechanisms typically rely on manual adjustment, requiring users to rotate handles or pull levers to change the angle and position of the backrest. While effective, these methods are cumbersome, cannot be adjusted while seated, and are not easily tailored to individual needs. To overcome these issues, modern chair designs increasingly favor automated linkage mechanisms. These mechanisms automatically adjust the backrest based on the user's posture, providing more ergonomic support. Current automatic adjustment mechanisms often involve complex mechanical structures, including multiple hinge components, gear transmission systems, and elastic mechanisms. Although these systems can achieve various adjustment functions, their designs are often complex and difficult to manufacture. Designers need to consider how to achieve efficient and reliable automatic adjustment functions while maintaining the system's ease of use.

[0004] Therefore, developing a new type of linkage mechanism that can automatically adjust the seat and backrest while maintaining structural simplicity and ensuring system reliability and comfort is a key direction for current technological development. This mechanism not only needs to meet diverse adjustment needs, but also needs to have advantages in terms of economy and manufacturing process. Utility Model Content

[0005] The purpose of this invention is to provide a linkage mechanism for automatic adjustment of chair backrests, which solves the problems of existing automatic chair backrest adjustment linkage mechanisms being complex in structure, difficult to manufacture, and not easy to adjust precisely according to individual needs.

[0006] This utility model achieves the above-mentioned objective through the following technical solution: a linkage mechanism for automatic adjustment of chair backrest, comprising a support part and a chair seat that cooperate with each other, a chair back assembly rotatably disposed at the end of the support part, and a linkage mechanism and an elastic mechanism disposed within the cavity of the support part. The linkage mechanism is used to realize the interaction between the chair seat and the chair back assembly, and the elastic mechanism is used to realize the reset of the chair seat and the chair back assembly after interaction.

[0007] Furthermore, the linkage mechanism includes a first linkage plate hinged to the seat, a second linkage plate rotatably disposed on the first linkage plate, and the second linkage plate hinged to the backrest assembly.

[0008] Furthermore, the linkage mechanism includes a first toothed plate fixedly installed at the bottom of the chair seat and a double gear rotatably disposed inside the support part. The first toothed plate meshes with the inner gear of the double gear, and a second toothed plate is disposed below the double gear, which meshes with the outer gear of the double gear.

[0009] Furthermore, a storage compartment is provided below the support portion to provide installation space for the elastic mechanism.

[0010] Furthermore, the chair back assembly includes a connecting bottom piece fixed to one end of the support portion, a chair back body rotatably disposed within the connecting bottom piece, a linkage mechanism acting on the chair back body, and a backrest provided at the end of the chair back body.

[0011] Furthermore, the second toothed plate has a hollowed-out groove that provides space for the first toothed plate to press down.

[0012] Beneficial effects: This utility model has a reasonable design, simple and stable structure, and strong practicality, and has the following beneficial effects:

[0013] 1. Automatic adjustment of comfort: This utility model realizes the automatic adjustment of the seat and backrest components through the cooperation of the linkage mechanism and the elastic mechanism. This design can automatically adjust the angle of the backrest component according to the user's weight and sitting posture, and automatically reset when it is no longer suitable, which improves the comfort and support of the sitting posture and reduces the tediousness of manual adjustment.

[0014] 2. Simple and durable structure: Due to the combination of the first and second linkage plates, or the cooperation of the first and second gear plates with double gears, the overall structure is more compact and durable. This design reduces complex mechanical parts, thereby reducing the failure rate and increasing the service life of the product.

[0015] 3. Flexible adjustment range: The linkage mechanism makes the adjustment range of the chair back assembly more flexible and controllable, and can prevent it from moving excessively, thereby ensuring the stability and safety of the chair back adjustment and improving the user experience. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the present invention;

[0017] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0018] Figure 3This is a structural schematic diagram of Embodiment 2 of the present invention.

[0019] In the diagram: 1-Support component, 2-Seat, 3-Backrest assembly, 4-Linkage mechanism, 5-Elastic mechanism, 6-Storage compartment, 7-Control component;

[0020] 301-Connecting base piece, 302-Chair back body, 303-Backrest, 401-First linkage plate, 402-Second linkage plate, 403-First gear plate, 404-Double gear, 405-Second gear plate, 406-Hollowed groove. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Example 1:

[0023] Combination Figure 1-2 The illustrated linkage mechanism for automatic adjustment of a chair backrest includes a support part 1 and a chair seat 2 that are configured to cooperate with each other. A chair back assembly 3 is rotatably mounted at the end of the support part 1. The support part 1 serves as the basic support structure of the entire device, and its design ensures stable support between the chair seat 2 and the chair back assembly 3. The chair seat 2 is the part that the user directly contacts. The adjustment of the chair back assembly 3 is related to the changes in the chair seat 2 to provide better comfort and support. A linkage mechanism 4 and an elastic mechanism 5 are provided inside the cavity of the support part 1. The linkage mechanism 4 is used to realize the interaction between the chair seat 2 and the chair back assembly 3. It converts the movement of the chair seat 2 into a corresponding angle adjustment of the chair back assembly 3 through mechanical linkage or gear transmission. The elastic mechanism 5 is used to realize the reset of the chair seat 2 and the chair back assembly 3 after action. The elastic mechanism 5 includes a spring, a gas spring, or other elastic materials. The elastic mechanism 5 ensures that the chair seat 2 and the chair back assembly 3 remain stable during use and automatically return to their initial positions after the user leaves the chair seat 2.

[0024] In this embodiment, the linkage mechanism 4 includes a first linkage plate 401 hinged to the seat 2. This hinged connection allows the first linkage plate 401 to rotate around the hinge point on the seat 2, thus providing a basis for subsequent adjustment. A second linkage plate 402 is rotatably mounted on the first linkage plate 401. The rotational setting of the second linkage plate 402 allows it to convert the force brought by the first linkage plate 401 into horizontal movement, avoiding jamming. The second linkage plate 402 is hinged to the backrest assembly 3. This connection method ensures that the backrest assembly 3 can move around the hinge point, thereby realizing the adjustment of the backrest angle.

[0025] In this embodiment, a storage compartment 6 is provided below the support part 1 to provide installation space for the elastic mechanism 5. The storage compartment 6 can ensure that the main functional part of the elastic mechanism 5 is placed inside it, avoiding excessive leakage that could cause operational interference between the components. In addition, the specific location of the storage compartment 6 is not limited, as long as it ensures that when the elastic mechanism 5 is placed inside it, it can be controlled between the support part 1 and the seat 2 to achieve the corresponding reset.

[0026] The chair back assembly 3 in this embodiment includes a connecting base 301 fixed to one end of the support part 1. The function of this connecting base 301 is to serve as the foundation and support point of the entire chair back assembly 3. The chair back body 302 is rotatably arranged inside the connecting base 301. This rotational design presents an arc swing during actual use to ensure the required swing angle of the chair back assembly 3. The linkage mechanism 4 acts on the chair back body 302 to ensure the linkage relationship between the components. A backrest 303 is provided at the end of the chair back body 302. The backrest 303 is designed to support the user's back and provide additional comfort.

[0027] In this embodiment, the elastic mechanism 5 is connected to a control component 7. The control component 7 is used to control the seat 2 to lock at any position on the support part 1, so that when a person wants to fix a sitting posture, the locking position can be adjusted.

[0028] Example 2: The linkage mechanism 4 in this example 2 is an improvement on the above example. The technical content disclosed in the above example will not be described again. The content of the above-disclosed example is also part of the content disclosed in this example 2.

[0029] One embodiment of this utility model, combined with Figure 3 The linkage mechanism 4 shown includes a first toothed plate 403 fixedly installed at the bottom of the seat 2 and a double gear 404 rotatably disposed inside the support part 1. The first toothed plate 403 serves as a stable contact surface for the double gear 404, which consists of two meshing gears, one of which is an internal gear and the other is an external gear. The first toothed plate 403 meshes with the internal gear of the double gear 404. A second toothed plate 405 is disposed below the double gear 404 and meshes with the external gear of the double gear 404. With this design, when the seat 2 drives the first toothed plate 403 to move downward, the first toothed plate 403 meshes with the internal gear of the double gear 404 to make it rotate. When the double gear 404 rotates, the second toothed plate 405 meshes with the external gear of the double gear 404, and the second toothed plate 405 is displaced, thereby achieving precise adjustment of the backrest assembly 3.

[0030] In addition, the second toothed plate 405 is provided with a hollowed-out groove 406 to provide space for the first toothed plate 403 to press down. Specifically, the hollowed-out groove 406 is a pre-designed opening area that forms a notch on the second toothed plate 405. The existence of this hollowed-out groove 406 allows the first toothed plate 403 to press down during the meshing process with the double gear 404 without being obstructed by the second toothed plate 405. In this way, when the first toothed plate 403 is pressed down by force, it can pass smoothly through the hollowed-out groove 406, avoiding direct collision with the second toothed plate 405, thereby maintaining the smooth operation of the gear mechanism.

[0031] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0032] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A linkage mechanism for automatic adjustment of a chair backrest, comprising a support (1) and a seat (2) that cooperate with each other, characterized in that: The support part (1) is rotatably provided with a backrest assembly (3). The cavity of the support part (1) is provided with a linkage mechanism (4) and an elastic mechanism (5). The linkage mechanism (4) is used to realize the interaction between the seat (2) and the backrest assembly (3). The elastic mechanism (5) is used to realize the reset of the seat (2) and the backrest assembly (3) after action.

2. The linkage mechanism for automatic adjustment of chair backrest according to claim 1, characterized in that: The linkage mechanism (4) includes a first linkage plate (401) hinged to the seat (2), a second linkage plate (402) rotatably disposed on the first linkage plate (401), and the second linkage plate (402) hinged to the backrest assembly (3).

3. The linkage mechanism for automatic adjustment of chair backrest according to claim 1, characterized in that: The linkage mechanism (4) includes a first toothed plate (403) fixedly installed at the bottom of the seat (2) and a double gear (404) rotatably disposed inside the support part (1). The first toothed plate (403) meshes with the inner gear of the double gear (404). A second toothed plate (405) is disposed below the double gear (404), and the second toothed plate (405) meshes with the outer gear of the double gear (404).

4. The linkage mechanism for automatic adjustment of chair backrest according to claim 1, characterized in that: Below the support (1) is a storage compartment (6) that provides installation space for the elastic mechanism (5).

5. The linkage mechanism for automatic adjustment of chair backrest according to claim 2, characterized in that: The chair back assembly (3) includes a connecting bottom piece (301) fixed to one end of the support part (1), a chair back body (302) is rotatably disposed inside the connecting bottom piece (301), the linkage mechanism (4) acts on the chair back body (302), and a backrest (303) is provided at the end of the chair back body (302).

6. The linkage mechanism for automatic adjustment of chair backrest according to claim 3, characterized in that: The second toothed plate (405) has a hollowed-out groove (406) that provides space for the first toothed plate (403) to press down.

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