A seat back angle adjustment mechanism

Abstract

This utility model relates to the field of chair technology, and in particular to a seat back angle adjustment mechanism, including a seat and a backrest, and further comprising: a mounting sleeve fixed to the rear end of the seat; a support frame, one end of which is fixedly connected to the mounting sleeve, and the other end extending upward to the front side of the backrest, the backrest being connected to the upper end of the support frame via a hinge; an adjusting gas spring, one end of which is connected to the bottom of the seat, and the other end connected to the lower end of the backrest; and a gas spring adjustment switch connected to the adjusting gas spring to control the opening and closing state of the adjusting gas spring. This utility model directly transmits the force on the backrest to the mounting sleeve rigidly connected to the seat through the hinge and support frame, ultimately acting on the rear end of the seat, avoiding complex lever structures, ensuring stable support for the backrest at various angles, and effectively preventing wobbling and abnormal noise.

Description

Technical Field

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

[0002] In modern office, home, and leisure settings, the ergonomic design of adjustable chairs is crucial for enhancing user comfort and health. Backrest angle adjustment is one of the core functions, allowing users to dynamically adjust support according to different sitting postures to alleviate pressure on the lumbar and spinal spine.

[0003] Traditional seat backrest adjustment mechanisms have some common shortcomings. While common gear-and-latch or paddle-type adjustment mechanisms can achieve multiple adjustable positions, the adjustment process is often accompanied by noticeable jerks and noise, failing to provide a smooth, stepless adjustment experience. Furthermore, they are prone to wobbling due to wear and tear after prolonged use. In addition, some designs use the gas spring directly to the bottom of the seat to achieve overall tilt, but this method places the fulcrum too far back, potentially causing the front edge of the seat to rise when tilting back, affecting the stability of the foot support and resulting in a poor user experience.

[0004] Chinese utility model patent with publication number CN206714500U discloses a backrest swing adjustment structure for an office chair. This structure forces the armrests and backrest angles to be linked, making it impossible for users to independently adjust the height or angle of the armrests according to their personal preferences. Moreover, during assembly, the swing support frame must be connected not only to the seat cushion and adjustment cylinder, but also to the backrest and elastic armrests, increasing the difficulty of assembly.

[0005] Therefore, the market urgently needs a seat back angle adjustment mechanism that is simple and reliable in structure, easy to assemble, can provide stable support, and offers a better user experience. Utility Model Content

[0006] The purpose of this invention is to provide a seat back angle adjustment mechanism to solve the problems mentioned in the background art.

[0007] The above-mentioned objective of this utility model is achieved through the following technical solution: a seat back angle adjustment mechanism, including a seat and a backrest, and further comprising:

[0008] Install the sleeve and fix it to the rear end of the chair seat;

[0009] A support frame, one end of which is fixedly connected to the mounting sleeve, and the other end extends upward to the front side of the backrest, the backrest being connected to the upper end of the support frame via a hinge.

[0010] The gas spring is connected at one end to the bottom of the seat and at the other end to the bottom of the backrest.

[0011] A pneumatic rod adjustment switch is connected to the pneumatic rod to control the opening and closing state of the pneumatic rod.

[0012] Preferably, the support frame is provided in at least two parts, which are symmetrically distributed from left to right.

[0013] Preferably, the front side of the backrest is provided with a hinge seat for connecting the support frame, and the height of the hinge seat is higher than the upper surface of the seat.

[0014] Preferably, the portion of the backrest from the hinge position to its lower end is bent backward so that the hinge is located in front of the lower end of the backrest.

[0015] Preferably, the lower end of the backrest is provided with a connecting plate extending forward, and the end of the adjusting gas spring is hinged to the connecting plate.

[0016] Preferably, the support frame is an L-shaped bracket, including a horizontal mounting section and a vertical support section. The mounting section is inserted into the mounting sleeve, and the backrest is connected to the upper end of the support section.

[0017] Preferably, the mounting sleeve is provided with a locking bolt for fixing the mounting section, and the locking bolt is screwed onto the mounting sleeve.

[0018] Preferably, the mounting section has multiple positioning holes linearly distributed thereon, and the locking bolts are inserted into the corresponding positioning holes.

[0019] The beneficial effects of this utility model are:

[0020] This utility model transmits the force on the backrest directly to the mounting sleeve that is rigidly connected to the seat through the hinge and support frame, and finally acts on the rear end of the seat. This avoids complex lever structures and ensures that the backrest can provide stable support at various angles, effectively preventing swaying and abnormal noise.

[0021] This utility model mainly consists of a few parts such as an installation sleeve, a support frame, and an adjusting air rod, making its structure simpler and helping to reduce production costs and assembly difficulty. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the angle adjustment mechanism in an embodiment of this utility model;

[0023] Figure 2 This is a side view of the angle adjustment mechanism in an embodiment of this utility model;

[0024] Figure 3 This is a schematic diagram of the support frame in an embodiment of this utility model;

[0025] In the diagram: 1-seat, 2-backrest, 3-mounting sleeve, 4-support frame, 401-mounting section, 402-support section, 403-positioning hole, 5-adjusting gas spring, 6-gas spring adjustment switch, 7-hinge seat, 8-connecting plate, 9-locking bolt. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings.

[0027] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of the present utility model.

[0028] Example 1:

[0029] like Figure 1 and Figure 2 As shown, a seat back angle adjustment mechanism includes a seat 1, a backrest 2, a mounting sleeve 3, a support frame 4, an adjusting gas spring 5, and a gas spring adjustment switch 6. The mounting sleeve 3 is fixed to the rear end of the seat 1 by welding. One end of the support frame 4 is fixedly connected inside the mounting sleeve 3, and the other end extends upward to the front side of the backrest 2. The backrest 2 is connected to the upper end of the support frame 4 by a hinge.

[0030] One end of the gas spring 5 is connected to the bottom of the seat 1, and the other end is connected to the lower end of the backrest 2. Both ends are hinged. The gas spring adjustment switch 6 is connected to the gas spring 5 to control its opening and closing state. Both the gas spring 5 and the gas spring adjustment switch 6 are commercially available components, with the same structure and adjustment method as the seat's height adjustment gas spring.

[0031] The support frame 4 is configured as at least two symmetrically distributed from left to right. In this embodiment, two sleeves 3 are installed at the rear end of the seat 1, and each sleeve 3 is equipped with a support frame 4.

[0032] like Figure 3 As shown, the support frame 4 is an L-shaped bracket, including a horizontal mounting section 401 and a vertical support section 402. The mounting section 401 is inserted into the mounting sleeve 3, and the backrest 2 is connected to the upper end of the support section 402.

[0033] The mounting sleeve 3 is provided with a locking bolt 9 for fixing the mounting section 401. The locking bolt 9 is screwed onto the mounting sleeve 3, and the end of the locking bolt 9 presses against the mounting section 401.

[0034] The backrest 2 has a hinge seat 7 on the front side for connecting the support frame 4. The height of the hinge seat 7 is higher than the upper surface of the seat 1.

[0035] The portion of the backrest 2 from the hinge seat 7 to its lower end bends backward so that the hinge seat 7 is located in front of the lower end of the backrest 2, thus allowing the hinge seat 7 some space for the lower end of the backrest 2 to swing in the back-and-forth direction.

[0036] The lower end of the backrest 2 is provided with a connecting plate 8 extending forward, and the end of the adjusting gas spring 5 is hinged to the connecting plate 8.

[0037] During installation, first connect the two support frames 4 to the backrest 2, then insert the mounting section 401 of the support frame 4 into the mounting sleeve 3, adjust it to the appropriate position, and then lock it with the locking bolt 9; finally, connect the two ends of the adjusting gas spring 5 to the backrest 2 and the seat 1 respectively, completing the assembly of the backrest 2 and the seat 1. When adjusting the angle of the backrest 2, toggle the gas spring adjustment switch 6 to allow the backrest 2 to swing freely, adjust it to a certain angle, and then release the gas spring adjustment switch 6.

[0038] Example 2:

[0039] like Figure 3 As shown, the difference from Embodiment 1 is that the mounting section 401 is provided with radially penetrating positioning holes 403. The positioning holes 40 are linearly distributed, and the locking bolts 9 are inserted into the corresponding positioning holes 403 to lock the mounting section 401. This facilitates adjusting the depth of the mounting section 401 inserted into the sleeve 3, thereby adjusting the front and rear position of the backrest 2 relative to the seat 1.

Claims

1. An angle adjustment mechanism of a seat backrest comprising a seat (1) and a backrest (2), characterized in that, Also includes: Install the sleeve (3) and fix it to the rear end of the seat (1); The support frame (4) has one end fixedly connected to the mounting sleeve (3) and the other end extends upward to the front side of the backrest (2). The backrest (2) is connected to the upper end of the support frame (4) by a hinge. The gas spring (5) is connected at one end to the bottom of the seat (1) and at the other end to the lower end of the backrest (2); A pneumatic rod adjustment switch (6) is connected to the adjustment pneumatic rod (5) to control the opening and closing state of the adjustment pneumatic rod (5).

2. A seat back angle adjustment mechanism according to claim 1, characterized in that: The support frame (4) is configured as at least two, and is symmetrically distributed on the left and right.

3. A seat back angle adjustment mechanism according to claim 1 or 2, characterised in that: The backrest (2) is provided with a hinge seat (7) for connecting the support frame (4) on the front side, and the height of the hinge seat (7) is higher than the upper surface of the seat (1).

4. A seat back angle adjustment mechanism according to claim 3, wherein: The backrest (2) bends backward from the position of the hinge (7) to its lower end so that the hinge (7) is in front of the lower end of the backrest (2).

5. A seat back angle adjustment mechanism according to claim 4, characterised in that: The lower end of the backrest (2) is provided with a connecting plate (8) extending forward, and the end of the adjusting gas rod (5) is hinged to the connecting plate (8).

6. A seat back angle adjustment mechanism according to claim 1 wherein: The support frame (4) is an L-shaped bracket, including a horizontal mounting section (401) and a vertical support section (402). The mounting section (401) is inserted into the mounting sleeve (3), and the backrest (2) is connected to the upper end of the support section (402).

7. A seat back angle adjustment mechanism according to claim 6, characterised in that: The mounting sleeve (3) is provided with a locking bolt (9) for fixing the mounting section (401), and the locking bolt (9) is screwed onto the mounting sleeve (3).

8. A seat back angle adjustment mechanism according to claim 7, characterized in that: The mounting section (401) has multiple positioning holes (403) linearly distributed on it, and the locking bolt (9) passes through the corresponding positioning hole (403).

Images