Backward leaning mechanism of office chair

Abstract

The utility model discloses a backward leaning mechanism of an office chair, and belongs to the technical field of office chairs. The backward leaning mechanism of the office chair further comprises a fixed block fixedly connected to the rear side of the connecting block; sliding grooves are formed in the two sides of the fixing block. The sliding groove is connected with a sliding block in a sliding mode. The lower end of the sliding block abuts against the pressing plate. The lower end of the pressing plate is fixedly connected with a pair of springs; torsion springs are arranged at the rotating connecting positions of the backrest and the connecting blocks respectively so that the backrest can reset automatically. A rotating shaft is arranged at the rotating joint of the base and the lower end of the connecting block; the rotating shaft is fixedly connected with the connecting block; the rotating shaft is a damping shaft; by arranging a fixing block, a spring, a pressing plate and a sliding block, when the spring contracts to the limit, the sliding block and the fixing block support the rear end of a backrest, the backrest is limited from excessively leaning backwards, the situation that the use experience of a user is reduced due to excessive leaning backwards is prevented, the backrest can be further prevented from excessively leaning backwards and rotating through a torsional spring, and the use experience and comfort are improved; and stable backward leaning is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of office chair technology, and more specifically, relates to an office chair reclining mechanism. Background Technology

[0002] An office chair is a chair with a backrest used for desk work. Broadly defined, it includes all chairs used in offices, such as executive chairs, mid-level chairs, guest chairs, staff chairs, conference chairs, visitor chairs, training chairs, and ergonomic chairs. While most office chairs have a reclining function, when reclined, the user's center of gravity is on the backrest, which can lead to instability and cause the chair to tip over.

[0003] A reclining office chair, as described in patent application CN202220544343.4, includes a base with two support rods fixedly mounted on its bottom in a symmetrical structure. A backrest is rotatably connected to the rear end of the base. A sliding sleeve is fixedly mounted on the back of the backrest, and a sliding plate is slidably connected to the inner wall of the sliding sleeve. A bracket is provided on the back of the backrest, and the backrest has two fixed seats in a symmetrical structure. Two collars are fixedly mounted on the outer circumference of the bracket in a symmetrical structure. Two torsion springs are slidably mounted on the outer circumference of the bracket. A baffle is fixedly mounted on the outer circumference of the bracket. A pivot is slidably connected to the inner wall of the sliding plate. By setting a spring inside the sliding sleeve, when the user's back rests against the backrest, the sliding plate slides inward along the sliding sleeve, compressing the spring. At this time, the backrest has a certain elasticity, thereby improving the comfort of the backrest.

[0004] Although the aforementioned reclining office chair allows for some flexibility in the backrest, its support is unstable during reclining, and excessive reclining reduces the user experience. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides an office chair reclining mechanism, which improves the user experience and comfort while ensuring stable reclining.

[0006] This utility model discloses a reclining mechanism for an office chair, comprising a base; a connecting block rotatably connected to the base; a backrest rotatably connected to the upper end of the connecting block; a fixing block fixedly connected to the rear side of the connecting block; sliding grooves on both sides of the fixing block; sliding blocks slidably connected to the sliding grooves; a lower end of the sliding block abutting against a pressure plate; a pair of springs fixedly connected to the lower end of the pressure plate; torsion springs respectively provided at the rotatable connection between the backrest and the connecting block to allow the backrest to automatically return to its original position; a rotating shaft provided at the rotatable connection between the base and the lower end of the connecting block; the rotating shaft being fixedly connected to the connecting block; and the rotating shaft being a damping shaft.

[0007] Preferably: a motor is fixedly connected to the lower end of the base; a first gear is fixedly connected to the output end of the motor; a second gear is fixedly connected to the end of the rotating shaft near the motor; the first gear and the second gear mesh.

[0008] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0009] (1) By setting a fixed block, spring, pressure plate and slider, when the spring is contracted to the limit, the slider and fixed block support the back end of the backrest, limiting the backrest from tilting too far back, preventing the user from reducing the user experience due to excessive tilting. The torsion spring can further prevent the backrest from tilting too far back and rotating, improving the user experience and comfort, and ensuring stable tilting.

[0010] (2) By setting up a motor, gear one, and gear two, and since the rotating shaft is a damping shaft, the angle between the connecting block and the base can be adjusted to improve the comfort of use. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0012] Figure 2 This is a schematic diagram of the internal structure of this utility model.

[0013] The following are the labels in the diagram: 11. Connecting block; 13. Torsion spring; 14. Motor; 15. Gear 1; 16. Gear 2; 17. Rotating shaft; 18. Fixing block; 19. Slide groove; 20. Spring; 21. Pressure plate; 22. Slider. Detailed Implementation

[0014] Specific Implementation Example 1: Please refer to Figure 1-2 An office chair reclining mechanism includes a base; a connecting block 11 rotatably connected to the base; a backrest rotatably connected to the upper end of the connecting block 11; a fixing block 18 fixedly connected to the rear side of the connecting block 11; sliding grooves 19 are formed on both sides of the fixing block 18; a slider 22 is slidably connected to the sliding grooves 19; the lower end of the slider 22 abuts against a pressure plate 21; a pair of springs 20 are fixedly connected to the lower end of the pressure plate 21; torsion springs 13 are respectively provided at the rotatable connection between the backrest and the connecting block 11 to allow the backrest to automatically return to its original position; the base and the connecting block 11 are rotatably connected to the backrest. A rotating shaft 17 is provided at the lower rotatable connection of the connecting block 11; the rotating shaft 17 is fixedly connected to the connecting block 11; the rotating shaft 17 is a damping shaft; by setting a fixed block 18, a spring 20, a pressure plate 21, and a slider 22, when the spring 20 is contracted to its limit, the slider 22 and the fixed block 18 support the backrest, limiting the backrest from excessively tilting back, preventing the user from reducing the user experience due to excessive tilting back, and the torsion spring 13 can further prevent the backrest from excessively tilting back and rotating, improving the user experience and comfort, and ensuring stable tilting back.

[0015] Please see Figure 1 The lower end of the base is fixedly connected to a motor 14; the output end of the motor 14 is fixedly connected to a gear 15; the end of the rotating shaft 17 near the motor 14 is fixedly connected to a gear 16; the gear 15 and the gear 16 mesh with each other; by setting the motor 14, gear 15, and gear 16, and since the rotating shaft 17 is a damping shaft, the angle between the connecting block 11 and the base can be adjusted to improve the comfort of use.

[0016] When in use, the motor 14 is started according to the usage requirements. The output end of the motor 14 drives the gear 15 to rotate. During the rotation of the gear 15, the gear 16 rotates. The rotation of the gear 16 drives the rotating shaft 17 to rotate. The rotation of the rotating shaft 17 drives the connecting block 11 to rotate, so that the angle of the backrest is more in line with the usage requirements.

[0017] After the user sits for a period of time, they will twist and lean back. When the user leans back, their back presses against the backrest, and the backrest rotates relative to the connecting block 11. The rear end of the backrest presses down the slider 22, and the slider 22 presses down the pressure plate 21. During the pressing down of the pressure plate 21, the spring 20 contracts. When the spring 20 contracts to its limit, the rear end of the backrest abuts against the edge of the slider 22 and the fixing block 18, and the rear end of the backrest is supported, preventing excessive leaning back and lack of support, which would reduce the user experience. When it is necessary to change the usage scenario, the angle of the backrest and the connecting block 11 can be improved by adjusting the motor 14.

[0018] The specification and claims use certain terms to refer to specific components. Those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The term "comprising" throughout the specification and claims is an open-ended term and should be interpreted as "comprising but not limited to." "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error.

[0019] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes said element.

[0020] The foregoing description presents and describes several preferred embodiments of this application. However, as mentioned above, it should be understood that this application is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the application concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this application should be within the protection scope of the appended claims.

Claims

1. An office chair reclining mechanism comprising a base; the base is rotatably connected with a connecting block (11); the upper end of the connecting block (11) is rotatably connected with a backrest; characterized in that, It also includes the fixed block (18) fixedly connected to the rear side of the connecting block (11); the sliding groove (19) is opened on both sides of the fixed block (18); the sliding block (22) is slidably connected to the sliding groove (19); the lower end of the sliding block (22) abuts against the pressing plate (21); the lower end of the pressing plate (21) is fixedly connected to a pair of springs (20); the torsional spring (13) is arranged at the rotating connection between the backrest and the connecting block (11) respectively, so that the backrest is automatically reset; the rotating shaft (17) is arranged at the rotating connection between the base and the lower end of the connecting block (11); the rotating shaft (17) is fixedly connected to the connecting block (11); and the rotating shaft (17) is a damping shaft.

2. A reclining mechanism for an office chair according to claim 1, characterized in that: The motor (14) is fixedly connected to the lower end of the base; the output end of the motor (14) is fixedly connected to the gear one (15); the gear two (16) is fixedly connected to the end of the rotating shaft (17) close to the motor (14); and the gear one (15) is engaged with the gear two (16).

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