A reclining angle adjusting structure and a chair

Abstract

The utility model relates to the field of seat discloses a kind of reclining angle adjusting structure and chair, with the function of accurate resistance adjustment, collaborative elastic support and flexible scene adaptation.The utility model first support;Second support, rotatably be located in first support;Torsion spring, one end of torsion spring is connected first support, the other end of torsion spring is connected second support;Resistance adjusting mechanism, including adjusting piece and compression elastic piece, adjusting piece is located in first support and can be moved to the up and down direction of first support, one end of compression elastic piece is connected adjusting piece, the other end is connected second support, and torsion spring is located in the side of compression elastic piece.

Description

Technical Field

[0001] This utility model relates to the field of seating, and in particular to a tilt angle adjustment structure and a chair. Background Technology

[0002] As a widely used appliance in daily work and life, the reclining adjustment function of a chair directly affects its comfort and adaptability. To meet the needs of different users (such as people of different weights and usage habits) and different scenarios (such as office, leisure, and rest), the adjustability of the reclining angle and the control of force during reclining have become one of the core performance indicators of chair design.

[0003] In existing technologies, seat and backrest tilt adjustment structures mostly employ mechanical locking mechanisms and elastic element pre-tensioning adjustments to achieve their functions. For example, some structures limit the tilt angle of the seat and backrest by setting a locking component with fixed positions, but their angle adjustment flexibility is poor, failing to achieve stepless or precise angle control and making it difficult to adapt to individual user needs. Other structures provide tilt resistance through elastic elements such as springs, but the pre-tension force of these elastic elements is often fixed, or can only be adjusted by complex disassembly and replacement of the elastic elements. This is cumbersome and has a limited range of applicability. For lighter users, excessive resistance may lead to difficulty tilting; for heavier users, insufficient resistance may cause the seat and backrest to tilt excessively backward, lacking stable support and even posing safety hazards. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a tilt angle adjustment structure, which has the functions of precise drag adjustment, coordinated elastic support, and flexible scene adaptation.

[0005] This utility model also proposes a chair with the above-mentioned tilt angle adjustment structure.

[0006] On one hand, the tilt angle adjustment structure according to an embodiment of the present invention includes: First support; The second bracket is rotatably mounted on the first bracket; A torsion spring, one end of which is connected to the first bracket, and the other end of which is connected to the second bracket. The resistance adjustment mechanism includes an adjustment element and a compression elastic element. The adjustment element is located on the first support and can move vertically relative to the first support. One end of the compression elastic element is connected to the adjustment element, and the other end is connected to the second support. The torsion spring is located to the side of the compression elastic element.

[0007] According to some embodiments of this utility model, at least two torsion springs are provided, and multiple torsion springs are respectively located on both sides of the compression elastic member.

[0008] According to some embodiments of the present invention, the adjusting member includes an adjusting bolt and a first washer. The adjusting bolt is rotatably mounted on the first bracket, and the adjusting bolt and the first washer are threadedly connected. One end of the compression elastic member is connected to the first washer. By driving the adjusting bolt to rotate, the first washer can move up and down based on the first bracket.

[0009] According to some embodiments of the present invention, the resistance adjustment mechanism further includes a planar bearing, one end of which is connected to an adjusting bolt, and the other end of which is connected to a first bracket.

[0010] According to some embodiments of the present invention, the second bracket is provided with a second gasket, the second gasket is rotatably disposed on the second bracket, and the other end of the compression elastic member is connected to the second gasket.

[0011] According to some embodiments of the present invention, a rotating shaft is also included, and both the first bracket and the second bracket are rotatably mounted on the rotating shaft.

[0012] According to some embodiments of the present invention, the first bracket is provided with a supporting inclined surface, which is located on the side of the compression elastic member away from the rotating shaft, and the supporting inclined surface can abut against the second bracket.

[0013] According to some embodiments of the present invention, it also includes an initial limiting member, which is disposed on the side of the rotating shaft away from the compression elastic member, and the two ends of the initial limiting member abut against the first bracket and the second bracket respectively.

[0014] According to some embodiments of the present invention, the first bracket is provided with a first mounting groove, the second bracket is provided with a second mounting groove, one end of the torsion spring is installed in the first mounting groove, and the other end of the torsion spring is installed in the second mounting groove.

[0015] On the other hand, the chair according to the present invention includes a tilt angle adjustment structure according to the above embodiments of the present invention.

[0016] The embodiments of this utility model have at least the following beneficial effects: By driving the adjustment component to move up and down, the compression amount of the compression elastic component can be precisely changed. The compression elastic component acts as a buffer, thereby precisely controlling the tilt force adjustment. After integrating this structure into the seat chassis, the backrest tilt angle threshold can be preset according to usage needs. When the user leans back against the backrest, the bracket can rotate smoothly along the preset angle, achieving a stable tilt movement of the backrest and avoiding discomfort caused by sudden angle changes.

[0017] To accommodate different seat models and diverse user needs, this structure features an adjustment mechanism at the bottom of the chassis. When a user perceives the backrest tilting force as too strong (e.g., excessive tilting with light leaning, lacking support) or too weak (e.g., difficulty in tilting back even with force, requiring considerable effort), they can directly rotate the knob to fine-tune the initial position of the adjustment mechanism, altering the preload of the elastic element and quickly adapting to individual usage habits. Whether for users of different weights (e.g., adults and teenagers) or for seats used in different scenarios, this knob adjustment provides a suitable tilting resistance, ensuring both backrest stability and enhancing the seat's versatility and long-term comfort.

[0018] Torsion springs provide basic elastic force through their own torsional deformation, which can compensate for the lack of elasticity of compressed elastic elements when tilting at small angles (such as in the initial leaning stage), making the transition of the seat back from "upright" to "tilted" smoother. At the same time, the torsion springs symmetrically arranged on both sides can counteract the lateral load that may occur during the tilting process (such as when the user leans on one side), preventing the bracket from jamming or deforming due to uneven force, and ensuring the force symmetry of the overall structure.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the overall structure of the tilt angle adjustment structure according to an embodiment of the present invention; Figure 2 This is a schematic cross-sectional view of the tilt angle adjustment structure under normal conditions according to an embodiment of this utility model; Figure 3 This is a cross-sectional structural diagram of the tilt angle adjustment structure in the tilt state according to an embodiment of the present utility model; Figure 4 This is a schematic diagram of the tilt angle adjustment structure according to an embodiment of the present invention, wherein the second bracket 200 has been removed; Figure label: First bracket 100, supporting inclined surface 110, first mounting groove 120, clearance groove 130, first limiting groove 140; Second bracket 200, second mounting slot 210; Resistance adjustment mechanism 300, adjusting bolt 310, compression elastic element 320, first shim 330, second shim 340, and plane bearing 350; 400 pivot, 410 keyway, 420 initial limiting component; Torsion spring 500. Detailed Implementation

[0021] The following will describe several embodiments of the present invention, including embodiments corresponding to the accompanying drawings. It should be understood that the drawings are used to assist in understanding the technical features and technical solutions of the present invention, and should not be construed as limiting the scope of protection of the present invention.

[0022] The following will provide a clear and complete description of the concept, specific structure, and technical effects of this utility model in conjunction with the embodiments and accompanying drawings, so as to fully understand the purpose, solution, and effects of this utility model. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0023] It should be noted that, unless otherwise explicitly defined, when a feature is referred to as "fixed," "connected," or "installed" on another feature, it can be directly fixed or connected to the other feature, or it can be indirectly fixed or connected to the other feature. The terms "fixed," "connected," and "installed" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0024] It should be noted that the descriptions of orientations or positional relationships indicated by terms such as up, down, left, right, top, bottom, front, back, inside, and outside used in this utility model are based on the orientations or positional relationships indicated by the accompanying drawings or embodiments. They are only for the purpose of facilitating the description of this utility model and simplifying the description, and are not intended to 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 utility model.

[0025] It should be noted that the term "and / or" used in this utility model includes any combination of one or more related listed items, "several" means one or more, "multiple" means two or more, "greater than", "less than", "exceeding" are understood to exclude the number itself, and "above", "below", "within" are understood to include the number itself.

[0026] It should be noted that the use of "first" and "second" in this utility model is only for the purpose of distinguishing technical features, and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated, or implicitly indicating the order of the technical features indicated.

[0027] It should be noted that, unless otherwise expressly defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and not for limiting the scope of the invention.

[0028] Reference Figures 1-4 The basic embodiment of the first aspect of this utility model provides a tilt angle adjustment structure, including: First support 100; The second bracket 200 is rotatably mounted on the first bracket 100; Two torsion springs 500, one end of which is connected to the first bracket 100, and the other end of which is connected to the second bracket 200. The resistance adjustment mechanism 300 includes an adjustment member and a compression elastic member 320. The adjustment member is located on the first support 100 and can move in the vertical direction relative to the first support 100. One end of the compression elastic member 320 is connected to the adjustment member, and the other end is connected to the second support 200. The torsion spring 500 is located on the side of the compression elastic member 320.

[0029] According to embodiments of this utility model, this configuration achieves at least the following effects: by driving the adjustment member to move in the up-down direction, the compression amount of the compression elastic member 320 can be precisely changed, and the compression elastic member 320 acts as a buffer, thereby precisely controlling the tilt force adjustment. After integrating this structure into the seat chassis, the backrest tilt angle threshold can be preset according to usage requirements. When the user leans back against the backrest, the bracket can smoothly rotate along the preset angle, achieving stable backrest tilt movement and avoiding discomfort caused by sudden angle changes.

[0030] To accommodate different seat models and diverse user needs, this structure features an adjustment mechanism at the bottom of the chassis. When a user perceives the backrest tilting force as too strong (e.g., excessive tilting with light leaning, lacking support) or too weak (e.g., difficulty in tilting back even with force, requiring considerable effort), they can directly rotate the knob to fine-tune the initial position of the adjustment mechanism, altering the preload of the elastic element and quickly adapting to individual usage habits. Whether for users of different weights (e.g., adults and teenagers) or for seats used in different scenarios, this knob adjustment provides a suitable tilting resistance, ensuring both backrest stability and enhancing the seat's versatility and long-term comfort.

[0031] The torsion spring 500 provides basic elastic force through its own torsional deformation, which can supplement the insufficient elasticity of the compression elastic element 320 when tilting at a small angle (such as in the initial leaning stage), making the transition of the seat back from "upright" to "leaning" smoother. At the same time, the torsion springs 500 symmetrically arranged on both sides can counteract the lateral load that may occur during the tilting process (such as when the user leans on one side), avoid the bracket from getting stuck or deformed due to uneven force, and ensure the force symmetry of the overall structure.

[0032] The elastic deformation of the torsion spring 500 has natural damping characteristics. When combined with the buffering effect of the compression elastic element 320, it can significantly reduce vibration and metal collision noise during the tilting process. In addition, when the seat back tilts to the limit angle, the combined restoring force of the torsion spring 500 and the compression elastic element 320 can form a "double limit", avoiding direct rigid contact of the bracket (such as when it abuts against the support slope 110), reducing structural wear and extending service life.

[0033] It should be noted that the compression elastic element 320 can be a compression spring, an elastic rubber element (made of natural rubber or synthetic rubber (such as nitrile rubber, silicone rubber)), or a disc spring (composed of multiple stacked conical discs, which generate elastic restoring force through the warping deformation of the discs when compressed).

[0034] In some embodiments, at least two torsion springs (500) are provided, and the plurality of torsion springs (500) are respectively located on both sides of the compression elastic member (320). At least two torsion springs 500 are symmetrically distributed on both sides of the compression elastic member 320 to form a composite elastic system of "central main adjustment + two-sided auxiliary support", which works in concert with the compression elastic member 320.

[0035] In some embodiments, the first embodiment of the adjusting member includes an adjusting bolt 310 and a first washer 330. The adjusting bolt 310 is rotatably disposed on the first bracket 100, and the adjusting bolt 310 and the first washer 330 are threadedly connected. One end of the compression elastic member 320 is connected to the first washer 330. By driving the adjusting bolt 310 to rotate, the first washer 330 can move up and down based on the first bracket 100. Further, the first washer 330 includes a limiting protrusion (not shown), and the first bracket 100 is provided with a limiting groove 140. The first limiting protrusion is located in the first limiting groove 140 to prevent the first washer 330 from rotating within the first limiting groove 140. The threaded connection between the adjusting bolt 310 and the first washer 330 transforms the user's rotation operation into a linear up-and-down movement of the first washer 330, enabling stepless fine-tuning of the preload of the compression elastic element 320. The self-locking characteristic of the threaded drive ensures stable position after adjustment, preventing loosening of the preload due to vibration during use. Users can sense changes in resistance by rotating the bolt, achieving high adjustment accuracy, suitable for scenarios sensitive to tilting forces, and can complete the operation without tools, improving convenience. The first washer 330, as the connecting carrier of the compression elastic element 320, increases the contact area with the elastic element, preventing uneven deformation of the elastic element due to excessive local stress, and extending its service life.

[0036] Furthermore, the resistance adjustment mechanism also includes a flat bearing 350, one end of which is connected to the adjusting bolt 310, and the other end is connected to the first bracket 100. When adjusting the tilt angle, the elastic element 320 is compressed, its elastic restoring force increases, and the pressure between the adjusting bolt 310 and the first washer 330 increases, resulting in increased friction between the adjusting bolt 310 and the first bracket 100. By setting the flat bearing 350 between the two, the friction can be effectively reduced, reducing the force required to compress the spring and making operation more convenient.

[0037] A planar thrust bearing (planar bearing) refers to a bearing that can achieve high axial load and high stiffness in a very small space. A planar bearing consists of a planar cage assembly with needle rollers, cylindrical rollers, or steel balls and planar washers. In a second embodiment of the adjusting component, the adjusting component includes a pin and a fixing pin. The pin moves up and down based on a first support 100. The pin has multiple positioning holes arranged along the vertical direction. The fixing pin is inserted into the corresponding holes in the positioning holes and the first support 100, allowing the pin and the first support 100 to be relatively fixed. The multi-positioning hole design of the pin, combined with the insertion of the fixing pin, forms a discrete gear adjustment mode. Its advantages are: clear gear positions; users can quickly switch preset resistances (such as "light resistance," "medium resistance," and "heavy resistance") by inserting and removing the fixing pin, without repeated fine-tuning, making it suitable for scenarios with high operational efficiency requirements, such as public seating in public places; the mechanical insertion structure has high reliability, wear resistance, and impact resistance, maintaining stable performance even with frequent adjustments or in harsh environments (such as humid or dusty environments), reducing maintenance costs.

[0038] In some embodiments, the second bracket 200 is provided with a second washer 340, which is rotatably disposed on the second bracket 200. The other end of the compression elastic member 320 is connected to the second washer 340. The rotatable second washer 340 can effectively reduce the torsional force of the compression elastic member 320 during rotation, thereby improving the service life of the compression elastic member 320. The rotatable second washer 340 on the second bracket 200, connected to the other end of the compression elastic member 320, forms a structure in which "the two ends of the elastic member can rotate relative to each other". When the second support 200 tilts and rotates with the back of the seat, the compression elastic element 320 will have a slight torsional tendency as the support angle changes. The rotational characteristics of the second pad 340 can counteract this torsional force and prevent the elastic element from fatigue damage (such as spring breakage or rubber cracking) due to long-term torsion. Rotary connection reduces rigid friction between elastic element and support, ensuring that the deformation of elastic element always proceeds along the axial direction (compression direction), guaranteeing stable elastic force output, and avoiding resistance fluctuations caused by lateral friction (such as sudden stiffening or loosening during tilting).

[0039] In some embodiments, the system further includes a rotating shaft 400, on which the first support 100 and the second support 200 are rotatably mounted. The rotating shaft 400 has a clearly defined rotation center, ensuring that the tilting trajectory of the two supports always revolves around a fixed axis, avoiding wobbling or jamming (such as the backrest swaying left and right) caused by a shift in the rotation center. The rotating shaft 400, through bearings or smooth shaft holes, reduces the coefficient of friction when the two supports rotate relative to each other, making the tilting action smoother. For example, when the user leans against it, there is no need to overcome additional friction, while also reducing wear between the metal supports and extending the overall lifespan of the structure. In some embodiments, the rotating shaft 400 is provided with multiple keyways 410, and lubricating oil is placed in the keyways to prevent lubricating oil loss and waste.

[0040] In some embodiments, the first support 100 is provided with a supporting inclined surface 110. When the seat is tilted back, the second support 200 rotates around the pivot 400 until the second support 200 abuts against the supporting inclined surface 110. The angle of the inclined surface 110 determines the limit angle at which the second support 200 can tilt during the tilting process. The supporting inclined surface 110 is used to support the second support 200, and plays a limiting and supporting role in the rotation of the second support 200. Compared with a hard collision on a flat surface, the impact force can be dispersed by the inclined surface. The supporting inclined surface 110 can be made of plastic or rubber to avoid abnormal noise when the two supports tilt to the limit angle, and can significantly reduce the abnormal noise of metal-to-metal collision during the tilting process.

[0041] In some embodiments, an initial limiting member is also included. The initial limiting member is disposed on the side of the rotating shaft 400 away from the compression elastic member 320. The two ends of the initial limiting member abut against the first bracket 100 and the second bracket 200 respectively, preventing the second bracket 200 from rotating away from the compression elastic member 320 in the initial stage.

[0042] In some embodiments, the first bracket 100 is provided with a first mounting groove 120, and the second bracket 200 is provided with a second mounting groove 210. One end of the torsion spring 500 is mounted in the first mounting groove 120, and the other end of the torsion spring 500 is mounted in the second mounting groove 210. No additional calibration is required during assembly. The mounting grooves can directly position the torsion spring 500 axially and radially, ensuring that multiple torsion springs 500 are always symmetrically distributed on both sides of the compression elastic member 320. During long-term use, the mounting slot can limit the displacement of the torsion spring 500 (such as axial movement during torsion), ensuring that the direction of the elastic force of the torsion spring 500 is always consistent with the direction of the tilting force, and maintaining the functional stability of the "auxiliary support" (such as the auxiliary elastic force will not fail due to the displacement of the torsion spring 500).

[0043] In some embodiments, the first support 100 is provided with a clearance groove 130, which is located on the movement path of the second support 200. Sufficient space is reserved for the rotation of the second support 200 to prevent edge collisions or friction between the two supports during tilting (especially during large-angle backward tilting), ensuring that the designed maximum tilt angle can be smoothly achieved.

[0044] In some embodiments, the adjustment component is provided with a drive wrench that protrudes from the first bracket 100. The drive wrench facilitates user control of the adjustment component's position. The wrench structure (e.g., bar-shaped, knob-shaped) conforms to hand grip habits, allowing users to quickly drive the adjustment component (e.g., rotate a bolt, insert or remove a pin) with one hand, without having to look down to find the adjustment position, thus improving the convenience of blind operation; the wrench protrudes from the bracket surface, allowing users to quickly locate the adjustment component by touch even in areas with poor visibility, such as under the seat (e.g., the lower part of the chassis), which is especially suitable for the need for "adjustment without leaving the seat" in office scenarios.

[0045] It should be noted that in this specification, terms such as "one embodiment", "some embodiments", "basic embodiment", and "extended embodiment" may be used to describe several embodiments of the present invention, and the specific features, structures, materials or characteristics of the several embodiments may be combined in accordance with the principles and spirit of the present invention.

[0046] Although some embodiments of the present utility model have been shown and described in this specification, the present utility model should not be limited to the above embodiments. As long as they achieve the technical effects of the present utility model by the same or equivalent means, any changes, modifications, equivalent substitutions and equivalent variations of these embodiments within the spirit and principles disclosed in the present utility model, without departing from the principles and purpose of the present utility model, should be included within the scope of protection disclosed in the present utility model and should be considered to fall within the protection scope of the present utility model.

Claims

1. A tilt angle adjustment structure, characterized in that, include: First support (100); The second bracket (200) is rotatably mounted on the first bracket (100). A torsion spring (500), one end of which is connected to the first bracket (100), and the other end of which is connected to the second bracket (200). The resistance adjustment mechanism (300) includes an adjustment member and a compression elastic member (320). The adjustment member is disposed on the first bracket (100) and can move in the vertical direction relative to the first bracket (100). One end of the compression elastic member (320) is connected to the adjustment member, and the other end is connected to the second bracket (200). The torsion spring (500) is located on the side of the compression elastic member (320).

2. The tilt angle adjustment structure according to claim 1, characterized in that: At least two torsion springs (500) are provided, and multiple torsion springs (500) are respectively located on both sides of the compression elastic member (320).

3. The tilt angle adjustment structure according to claim 1, characterized in that: The adjusting component includes an adjusting bolt (310) and a first washer (330). The adjusting bolt (310) is rotatably mounted on the first bracket (100). The adjusting bolt (310) and the first washer (330) are threaded together. One end of the compression elastic element (320) is connected to the first washer (330). By driving the adjusting bolt (310) to rotate, the first washer (330) can move up and down based on the first bracket (100).

4. The tilt angle adjustment structure according to claim 3, characterized in that: The resistance adjustment mechanism also includes a plane bearing (350), one end of which is connected to the adjusting bolt (310), and the other end is connected to the first bracket (100).

5. The tilt angle adjustment structure according to claim 1, characterized in that: The second bracket (200) is provided with a second gasket (340), the second gasket (340) is rotatably disposed on the second bracket (200), and the other end of the compression elastic member (320) is connected to the second gasket (340).

6. The tilt angle adjustment structure according to claim 1, characterized in that: It also includes a rotating shaft (400), on which both the first bracket (100) and the second bracket (200) are rotatably mounted.

7. The tilt angle adjustment structure according to claim 6, characterized in that: The first bracket (100) is provided with a support slope (110), which is located on the side of the compression elastic member (320) away from the rotating shaft (400), and the support slope (110) can abut against the second bracket (200).

8. The tilt angle adjustment structure according to claim 6, characterized in that: It also includes an initial limiting member (420), which is located on the side of the rotating shaft (400) away from the compression elastic member (320), and the two ends of the initial limiting member (420) abut against the first bracket (100) and the second bracket (200) respectively.

9. The tilt angle adjustment structure according to claim 1, characterized in that: The first bracket (100) is provided with a first mounting groove (120), the second bracket (200) is provided with a second mounting groove (210), one end of the torsion spring (500) is installed in the first mounting groove (120), and the other end of the torsion spring (500) is installed in the second mounting groove (210).

10. A chair, characterized in that: Includes the tilt angle adjustment structure as described in any one of claims 1 to 9.

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