Tilting and pitching fine-adjustment backrest

Abstract

The utility model relates to a backrest of a swivel chair, in particular to a leaning and pitching fine adjustment backrest, and belongs to the technical field of swivel chairs. The tipping fine-adjustment backrest comprises a backrest support frame, a backrest and a backrest mounting assembly, the backrest support frame is provided with a support frame connecting part for limiting excessive rotation of the backrest; the backrest mounting assembly comprises a first fixing body, a second fixing body and an elastic limiting assembly. According to the utility model, the backrest is rotatably connected and mounted on the backrest support frame through the backrest mounting assembly. The utility model has the characteristics of simple structure and convenience in installation; the structure allows the backrest to rotate along with the sitting posture of the user within a certain angle range, and has the advantage of being comfortable to use.

Description

Technical Field

[0001] This utility model relates to a backrest of a swivel chair, and more particularly to a tilt-adjustable backrest, belonging to the field of swivel chair technology. Background Technology

[0002] Swivel chairs are among the most common office furniture. Although their shapes and structures vary, most include chair legs, gas spring support columns, a tray, a seat, armrests, and a backrest. The tray, supporting the seat and connecting the gas springs, is a crucial structural component. Most swivel chairs attach the armrests and backrest separately to the seat or tray. Some swivel chairs also have a base to support the tray, integrated into the base. This base not only supports the armrests and backrest, sharing some of the structural burden, but also covers and protects the tray, enhancing its aesthetics. Still other swivel chairs connect the armrests and backrest after they are installed separately to improve the overall integrity of the chair.

[0003] For example, utility model patent CN 202908269U discloses a seat with an integrated seat, backrest, and armrest structure. This seat includes an integrated seat, backrest, and armrest structure and a backrest, with the backrest fixed to the integrated structure. The backrest and armrests of this integrated structure are integrally molded. This solution connects the armrests and backrest to the seat base shell used to support the tray, and then fixes the armrests to the upper part of the backrest. This structure can be injection molded in one piece, eliminating the need for subsequent assembly, simplifying the manufacturing process and offering the advantage of high integrity. However, by molding the seat base shell as well, this structure becomes exceptionally bulky, making storage and transportation inconvenient. Utility Model Content

[0004] This invention aims to solve the aforementioned problems by providing a tilt-adjustable backrest. The invention uses a backrest mounting assembly to rotatably mount the backrest to a backrest support frame. The backrest support frame includes a support frame connecting part to limit excessive rotation of the backrest, and the backrest mounting assembly includes an elastic limiting component to constrain the rotation angle of the backrest. This makes the invention convenient to install and comfortable to use.

[0005] The technical solution of this utility model to solve the above problems is as follows:

[0006] A tilt-adjustable backrest includes a backrest support frame and a backrest. The backrest includes a backrest frame and a backrest body that is mounted or fixed based on the backrest frame. The backrest frame is rotatably mounted to the backrest support frame via a backrest mounting assembly. The backrest support frame has a support frame connecting portion that limits excessive rotation of the backrest. The backrest mounting assembly includes a first fixing body fixedly disposed on the backrest support frame and a second fixing body fixedly disposed on the backrest frame and rotatably connected to the first fixing body. The backrest mounting assembly further includes an elastic limiting component disposed within the backrest frame to constrain the rotation angle of the backrest. The elastic limiting component includes an elastic element, a first fixing member for fixing the elastic element to the backrest frame in a first position, and a mounting member for fixing the elastic element to the first fixing body in a second position.

[0007] As a preferred embodiment of the above technical solution, the mounting component includes a carrier with an elastic element mounting position, a torque transmission component with one end fixed to the carrier and the other end fixed to the backrest support frame, a first fastener for fixing the torque transmission component to the carrier, and a second fastener for fixing the elastic element to the carrier.

[0008] As a preferred embodiment of the above technical solution, the mounting component further includes a shaft housing fixed to the carrier, the shaft housing being simultaneously fitted onto the torque transmission component and sleeved within the second fixing body.

[0009] As a preferred embodiment of the above technical solution, the torque transmission component is a composite component consisting of a spline and a spline sleeve.

[0010] As a preferred embodiment of the above technical solution, the spline sleeve is fixedly connected to the backrest support frame, and the spline is fixedly connected to the carrier through the first fastener.

[0011] As a preferred embodiment of the above technical solution, the elastic element has two components, the carrier has two mounting slots, the first fastener has two components, each used to fix the first end of the two elastic elements to the backrest frame, and the second fastener has two components, each used to fix the second end of the two elastic elements to the two mounting slots.

[0012] As a preferred embodiment of the above technical solution, both elastic elements are spring sheets.

[0013] As a preferred embodiment of the above technical solution, the two elastic elements are distributed vertically and form an angle α, where 120° < α < 170°.

[0014] As a preferred embodiment of the above technical solution, the backrest support frame is a modified armrest, including a support frame mounting part, an armrest part, and a support frame connecting part; the armrest part includes an armrest support part and an armrest body part; there are two armrest parts, the support frame connecting part fixes the two armrest parts together from the top, and the support frame mounting part fixes the two armrests together from the bottom, so that the backrest support frame forms a closed-loop frame structure.

[0015] As a preferred embodiment of the above technical solution, the support frame mounting part is provided with a mounting plate for mounting the backrest support frame to the tray.

[0016] As a preferred embodiment of the above technical solution, a third fixing body adapted to support the seat base shell for carrying the tray is formed or installed on the armrest support.

[0017] As a preferred embodiment of the above technical solution, the tilt-adjustable backrest further includes a lumbar support assembly, which includes a lumbar support body and a flexible carrier for mounting the lumbar support body. The upper end of the flexible carrier is connected to the support frame connection part, and the lower end of the flexible carrier is connected to the lower part of the backrest frame.

[0018] In summary, this utility model has the following beneficial effects:

[0019] 1. This utility model rotatably mounts the backrest to the backrest support frame via a backrest mounting assembly. The backrest support frame includes a support frame connecting part to limit excessive rotation of the backrest, and the backrest mounting assembly includes an elastic limiting component to constrain the rotation angle of the backrest. The above structure is relatively simple, making this utility model easy to install. The above structure allows the backrest to rotate within a certain angle range according to the user's sitting posture, providing a comfortable user experience.

[0020] 2. The elastic limiting component of this utility model transmits torque through splines and spline sleeves. This split structure facilitates the fixed installation of the torque transmission component at both ends. Furthermore, the setting of the shaft housing ensures that the torque transmission component does not directly contact the second fixed body set on the backrest frame, thereby stabilizing the interaction between the two.

[0021] 3. In a preferred embodiment, the elastic limiting component of this utility model has a symmetrical structure with two elastic plates; the upper and lower elastic plates provide elastic action in different directions at different tilt angles of the backrest, and the two interact with each other to have a damping effect, thereby improving the comfort of the product.

[0022] 4. In one embodiment of this utility model, the backrest support frame is also a modified armrest, which forms a closed-loop frame structure, with good integrity and firm installation.

[0023] 5. In another embodiment of this utility model, the tilt-adjustable backrest also includes a lumbar support assembly, which includes a lumbar support body and a flexible carrier for mounting the lumbar support body, further improving the comfort of the product. Attached Figure Description

[0024] Figure 1 This is a side view of Example 1;

[0025] Figure 2 This is the front view of Example 1;

[0026] Figure 3 This is the overall assembly drawing of Example 1;

[0027] Figure 4 This is a partial assembly drawing of Example 1;

[0028] Figure 5 This is a side view of Example 2;

[0029] Figure 6 This is the front view of Example 2;

[0030] In the diagram, the component names represented by each number are as follows:

[0031] 1-Backrest support frame,

[0032] 2-Backrest,

[0033] 3-Backrest mounting assembly,

[0034] 4-Lumbar support components

[0035] 11-Support frame connection part,

[0036] 12-Handrail support section,

[0037] 13-Handrail body,

[0038] 14-Support frame mounting section,

[0039] 15-Mounting plate,

[0040] 121-Third Fixing Body,

[0041] 21-Backrest frame,

[0042] 31-First fixed body,

[0043] 32-Second fixed body,

[0044] 33-Elastic limiting component,

[0045] 41-Lumbar support body,

[0046] 42-Flexible carrier,

[0047] 331 - Elastic element,

[0048] 332-Fasteners,

[0049] 333-carrier,

[0050] 334 - Torque Transmission Component

[0051] 335 - First fastener

[0052] 336-shaft housing,

[0053] 337 - Limiting component,

[0054] 3341-Spline,

[0055] 3342 - Spline sleeve. Detailed Implementation

[0056] The present invention will be further explained below with reference to the accompanying drawings.

[0057] This specific embodiment is merely an explanation of the present invention and is not intended to limit it. Any changes made by those skilled in the art after reading this specification, as long as they fall within the scope of the claims, will be protected by patent law.

[0058] Example 1

[0059] like Figures 1-4 As shown, a tilt-adjustable backrest includes a backrest support frame 1 and a backrest 2. The backrest 2 is rotatably mounted on the backrest support frame 1 via a backrest mounting assembly 3. In this embodiment, the backrest support frame 1 is a modified armrest, including a support frame mounting part 14, an armrest part, and a support frame connecting part 11; wherein the armrest part includes an armrest support part 12 and an armrest body part 13; the support frame connecting part 11 is used to limit excessive rotation of the backrest 2.

[0060] The armrest has two parts. The support frame connecting part 11 connects the two armrests from the top, and the support frame mounting part 14 connects the two armrests from the bottom, so that the backrest support frame forms a closed-loop frame structure. More specifically, the armrest body part 13 is generally horizontally arranged, and the armrest support part 12 is used to support the armrest body part. The two are integrally connected. Figure 1 It can be seen that the two form an angle of approximately 50°. The support frame mounting part 14 is provided with a mounting plate 15 for mounting the backrest support frame 1 to the tray; the armrest support part 12 is provided with a third fixing body 121 adapted to the seat bottom shell for supporting the tray.

[0061] The backrest 2 includes a backrest frame 21 and a backrest body (not shown in the figure); the backrest body is installed or fixed based on the backrest frame 21.

[0062] like Figures 3-4 As shown, the backrest frame 21 is rotatably mounted to the backrest support frame 1 via the backrest mounting assembly 3. The backrest mounting assembly 3 includes a first fixing body 31, a second fixing body 32, and an elastic limiting component 33.

[0063] The first fixing body 31 is fixedly mounted on the backrest support frame 1;

[0064] The second fixing body 32 is fixedly installed on the backrest frame 21;

[0065] The elastic limiting component 33 constrains the rotation angle of the backrest 2; it includes:

[0066] The elastic element 331 is an elastic sheet, which has two elements to provide restoring force from two different directions;

[0067] Fastener 332 is used to fix the first end of the elastic element 331 to the backrest frame 21 in the first position;

[0068] The carrier 333 has a symmetrical structure and has two mounting positions for the elastic elements 331, which are used to fix the second end of the elastic elements 331.

[0069] Spline 3341, one end is fixed to the carrier 333, and the other end is used to dock with spline sleeve 3342;

[0070] Spline sleeve 3342, one end is fixed to the first fixing body 31, and the other end is used to dock with the spline 3341;

[0071] The first fastener 335 is used to fix the spline 3341 to the carrier 333;

[0072] A second fastener (not shown in the figure) is used to fix the second end of the elastic element 331 to the carrier 333 at a second position;

[0073] The shaft housing 336 is fixed to the carrier 333 and is also fitted onto the torque transmission component 334 and fitted inside the second fixed body 32. The torque transmission component 334 is formed by the spline 3341 and the spline sleeve 3342 after docking.

[0074] The limiting member 337 is fixed to the backrest frame 21 and is disposed on the travel of the elastic element 331 to provide a limiting effect on the elastic element 331 when it deforms, thereby enhancing the restoring force of the elastic element 331.

[0075] like Figure 3 As shown, the two elastic elements 331 are distributed vertically and form an angle α, where 120° < α < 170°; in this embodiment, α is approximately 150°.

[0076] Example 2

[0077] A tilt-adjustable backrest includes a backrest support frame 1 and a backrest 2. The backrest 2 is rotatably mounted on the backrest support frame 1 via a backrest mounting assembly 3. The backrest mounting assembly 3 is the same as in Embodiment 1, and will not be described again in this embodiment. The difference from Embodiment 1 lies in the backrest support frame 1.

[0078] like Figure 5 As shown, the side view of the backrest support frame 1 is L-shaped. Similar to Embodiment 1, as... Figure 6 As shown, the backrest support frame 1 also has a support frame connecting part 11 to limit excessive rotation of the backrest 2. Due to the different shape, the support frame connecting part 11 in this embodiment has a different spatial position. Compared with embodiment 1, the support frame connecting part 11 in this embodiment is positioned higher and closer to the upright backrest 2. Therefore, in this embodiment, a lumbar support assembly 4 is also provided on the backrest support frame 1 and the backrest 2 support. Figure 6 As shown, the lumbar support assembly 4 includes a lumbar support body 41 and a flexible carrier 42 for mounting the lumbar support body. The upper end of the flexible carrier 42 is connected to the support frame connecting part 11, and the lower end of the flexible carrier 42 is connected to the lower part of the backrest frame 21.

Claims

1. A tilt-adjustable backrest, comprising a backrest support frame (1) and a backrest (2), wherein the backrest (2) comprises a backrest frame (21) and a backrest body for mounting or fixing based on the backrest frame (21); characterized in that: The backrest frame (21) is rotatably mounted to the backrest support frame (1) via the backrest mounting assembly (3); the backrest support frame (1) has a support frame connecting part (11) that limits excessive rotation of the backrest (2); the backrest mounting assembly (3) includes a first fixing body (31) fixedly mounted on the backrest support frame (1) and a second fixing body (32) fixedly mounted on the backrest frame and rotatably connected to the first fixing body; the backrest mounting assembly (3) also includes an elastic limiting component (33) disposed in the backrest frame (21) to constrain the rotation angle of the backrest; the elastic limiting component (33) includes an elastic element (331), a fixing member (332) for fixing the elastic element to the backrest frame in a first position, and a mounting member for fixing the elastic element to the first fixing body (31) in a second position.

2. The tilt-adjustable backrest according to claim 1, characterized in that: The mounting component includes a carrier (333) with an elastic element mounting position, a torque transmission component (334) with one end fixed to the carrier and the other end fixed to the backrest support frame, a first fastener (335) for fixing the torque transmission component to the carrier, and a second fastener for fixing the elastic element to the carrier.

3. The tilt-adjustable backrest according to claim 2, characterized in that: The mounting component also includes a shaft housing (336) fixed to the carrier (333), the shaft housing (336) being fitted onto the torque transmission component and fitted into the second fixing body (32).

4. A tilt-adjustable backrest according to claim 2, characterized in that: The torque transmission component is a composite component consisting of a spline (3341) and a spline sleeve (3342).

5. A tilt-adjustable backrest according to claim 4, characterized in that: The spline sleeve (3342) is fixedly connected to the backrest support frame (1), and the spline (3341) is fixedly connected to the carrier (333) through the first fastener (335).

6. A tilt-adjustable backrest according to claim 4, characterized in that: The elastic element (331) has two parts, and the carrier (333) has two mounting slots; the first fastener has two parts, which are used to fix the first ends of the two elastic elements (331) to the backrest frame (21); the second fastener has two parts, which are used to fix the second ends of the two elastic elements (331) to the two mounting slots.

7. A tilt-adjustable backrest according to claim 6, characterized in that: Both elastic elements (331) are spring sheets.

8. A tilt-adjustable backrest according to claim 7, characterized in that: The two elastic elements (331) are distributed vertically and form an angle of α, where 120° < α < 170°.

9. A tilt-adjustable backrest according to claim 1, characterized in that: The backrest support frame (1) is a modified armrest, including a support frame mounting part (14), an armrest part and the support frame connecting part (11); the armrest part includes an armrest support part (12) and an armrest body part (13); there are two armrest parts, the support frame connecting part (11) connects the two armrest parts from the top, and the support frame mounting part (14) connects the two armrests from the bottom, so that the backrest support frame forms a closed-loop frame structure.

10. A tilt-adjustable backrest according to claim 9, characterized in that: The support frame mounting part (14) is provided with a mounting plate (15) for mounting the backrest support frame (1) to the tray.

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