Backrest inclination adjusting structure of office chair

Abstract

The utility model relates to the technical field of office chairs, and discloses a backrest inclination adjusting structure of an office chair, which comprises a base, a cushion is movably arranged above the base, a backrest is mounted at the rear end of the cushion, an adjusting component is connected to the lower end of the backrest, and the adjusting component comprises a semi-cylindrical block arranged on the base. A turbine is fixedly arranged outside the semi-cylindrical block, semi-circular blocks are connected to the two ends of the semi-cylindrical block, a moving groove is formed in the top end of each semi-circular block, a mounting frame is arranged above the semi-cylindrical blocks, a connecting block is arranged at the lower end of the mounting frame, the lower end of the connecting block penetrates through the moving groove and is sleeved with a limiting ring, and a semi-circular groove is formed in the bottom side of the mounting frame; a worm is arranged in the semicircular groove, positioning blocks are rotationally arranged at the two ends of the worm, one end of the worm is connected with a motor, the inclination angle of the backrest is controlled through the adjusting assembly, the requirements of a user are met, and the problems that according to an existing office chair, the inclination angle of the backrest is inconvenient to adjust, and the office and rest requirements of the user cannot be met are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of office chairs, in particular to a backrest inclination adjustment structure of an office chair. Background Art

[0002] An office chair refers to a variety of chairs that are used for the convenience of work in daily work and social activities. Office partners divide office chairs into narrow and broad categories. An office chair in a narrow sense refers to a chair with a backrest that a person sits on when doing desk work in a sitting position. An office chair in a broad sense refers to all chairs used in offices, including executive chairs, mid-shift chairs, meeting chairs, staff chairs, conference chairs, visitor chairs, training chairs, etc. Generally, an office chair seat cushion only has a backrest and a seat cushion and no other functions. People in offices are all mental workers, who think a lot, have high work pressure, and are prone to fatigue. In order to relieve fatigue, relax nerves, and reduce stress, users have an increasing demand for flexible office chairs.

[0003] Chinese patent document CN212117629U discloses a conveniently adjustable detachable office chair, comprising: a base, a backrest and two armrests, a pillow plate is detachably installed on the top of the backrest; a cushion is arranged on the top of the base, two armrests are hinged on the base and are respectively located on both sides of the cushion; a plurality of through holes are provided on the backrest; a door-shaped frame is fixed on the rear end surface of the backrest; the bottom of the door-shaped frame is fixed to the base; a hand support component is pivotally connected to the top of the two armrests; both hand support components are provided with a switch knob; a first magnet is embedded in the connecting end of the pillow plate, a groove is arranged on the top of the backrest, a second magnet is embedded in the inner wall of the groove, the connecting end of the pillow plate is filled in the groove, and the first magnet and the second magnet are magnetically attracted; a first motor for driving and adjusting the inclination of the armrest is installed at the hinge of the armrest and the base, and the utility model has a stable structure and is easy to install and disassemble. However, the device is not convenient for adjusting the inclination of the backrest of the office chair, and cannot meet the needs of the user for office rest.

[0004] Therefore, in order to solve such problems, we propose a backrest inclination adjustment structure for an office chair. Utility Model Content

[0005] The utility model aims to provide a backrest inclination adjustment structure for an office chair, aiming to solve the problem in the above-mentioned background technology that the backrest inclination of the existing office chair is not convenient to adjust and cannot meet the needs of users for working and resting.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: an office chair backrest inclination adjustment structure, comprising a fixed seat, a lifting assembly is arranged on the top of the fixed seat, a base is installed on the top of the lifting assembly, a seat cushion is movably arranged above the base, a backrest is installed on the base at the rear end of the seat cushion, and the lower end of the backrest is connected to the adjustment assembly;

[0007] The adjusting component includes a semi-cylindrical block arranged at the rear end of the base, a worm gear is fixedly arranged on the outside of the semi-cylindrical block, semi-circular ring blocks are connected to both ends of the semi-cylindrical block, a movable groove is penetrated through the top of the semi-circular ring block, a mounting frame is arranged above the semi-cylindrical block and the semi-circular ring block, a backrest is connected to the top of the mounting frame, connecting blocks are arranged on both sides of the lower end of the mounting frame, the connecting blocks are movably arranged inside the movable groove, a limiting ring is fixedly sleeved on the outside of the lower end of the connecting block, a semi-circular groove is opened on the side of the mounting frame close to the worm gear, a worm is arranged inside the semi-circular groove, positioning blocks are rotatably arranged at both ends of the worm, the positioning blocks are fixedly installed in the semi-circular groove, one end of the worm is connected to a motor, and the worm cooperates with the worm gear.

[0008] Preferably, the lifting assembly includes a sleeve arranged on the top of the fixed seat, a lifting pneumatic cylinder is arranged inside the sleeve, a push rod is connected to the output end of the lifting pneumatic cylinder, a support tube is arranged on the top of the push rod, the support tube is movably arranged inside the sleeve, and a base is installed on the upper end of the support tube.

[0009] Preferably, a telescopic rod is provided on the base, and the telescopic rod is rotatably connected to the front side of the backrest through a hinge.

[0010] Preferably, a movable groove is provided on the top of the base, an electric guide rail is provided inside the movable groove, a sliding block is provided on the outer sliding sleeve of the electric guide rail, and the top of the sliding block is connected to the bottom side of the seat cushion.

[0011] Preferably, a slide groove is provided at the top of the base between the movable grooves, a roller is provided inside the slide groove, and the roller is installed at the bottom of the seat cushion.

[0012] Preferably, armrests are rotatably provided on both sides of the seat cushion, and control panels are provided on the armrests.

[0013] The utility model has the following beneficial effects:

[0014] In the utility model, firstly, the worm is controlled to rotate by a motor, and the worm is meshed with the worm wheel, so that the worm moves along the trajectory of the worm wheel, driving the mounting frame to rotate with the center of the worm wheel as the center point, so as to adjust the inclination angle of the backrest. The device can flexibly adjust the inclination angle of the office chair backrest to meet the various needs of office people. The seat cushion can be adjusted accordingly with the adjustment of the backrest, thereby improving the comfort of the user and having high practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a three-dimensional schematic diagram of a backrest inclination adjustment structure of an office chair proposed by the utility model;

[0016] Figure 2 This is a schematic plan view of a backrest inclination adjustment structure of an office chair proposed by the utility model;

[0017] Figure 3 It is a three-dimensional exploded schematic diagram of a lifting component in a backrest inclination adjustment structure of an office chair proposed by the utility model;

[0018] Figure 4 It is a three-dimensional exploded schematic diagram of a base in a backrest inclination adjustment structure of an office chair proposed by the utility model;

[0019] Figure 5 A three-dimensional exploded diagram of an adjustment component in a backrest inclination adjustment structure of an office chair proposed in the utility model Figure 1 ;

[0020] Figure 6 A three-dimensional exploded diagram of an adjustment component in a backrest inclination adjustment structure of an office chair proposed in the utility model Figure 2 .

[0021] Legend:

[0022] 1. Fixed seat; 2. Lifting assembly; 21. Sleeve; 22. Lifting pneumatic cylinder; 23. Push rod; 24. Support tube; 3. Base; 31. Movable groove; 32. Slide groove; 4. Cushion; 5. Backrest; 6. Adjustment assembly; 61. Semi-cylindrical block; 62. Worm gear; 63. Semi-circular ring block; 64. Moving groove; 65. Mounting frame; 66. Connecting block; 67. Limiting ring; 68. Semi-circular groove; 69. Worm; 610. Positioning block; 611. Motor; 7. Telescopic rod; 71. Hinge; 8. Electric guide rail; 81. Slider; 9. Roller; 10. Control panel. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In the description of the present utility model, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. The terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected, or indirectly connected through an intermediate medium, or it can be a communication between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0025] Reference Figure 1-6 The utility model provides an embodiment: a backrest inclination adjustment structure of an office chair, comprising a fixed seat 1, a lifting assembly 2 is arranged on the top of the fixed seat 1, and the seat height is adjusted by the lifting assembly 2, a base 3 is installed on the top of the lifting assembly 2, and a cushion 4 is movably arranged above the base 3, and the cushion 4 can be adjusted in conjunction with the backrest 5 to make the office chair more comfortable, and a backrest 5 is installed on the base 3 at the rear end of the cushion 4, and an adjustment assembly 6 is connected to the lower end of the backrest 5, and the inclination angle of the backrest 5 is controlled by the adjustment assembly 6 to meet the user's own needs;

[0026] The adjusting assembly 6 includes a semi-cylindrical block 61 fixedly arranged at the rear end of the base 3, a worm gear 62 is fixedly arranged on the outside of the semi-cylindrical block 61, and the track of the worm gear 62 is semicircular. Semi-circular ring blocks 63 are connected to both ends of the semi-cylindrical block 61, and a moving groove 64 is penetrated through the top of the semi-circular ring block 63. A mounting frame 65 is arranged above the semi-cylindrical block 61 and the semi-circular ring block 63, and the top of the mounting frame 65 is connected to the backrest 5. Connecting blocks 66 are arranged on both sides of the lower end of the mounting frame 65, and the lower end of the connecting block 66 passes through the moving groove 64 and extends to the inner side of the semi-circular ring block 63, and the connecting block 66 is movably arranged inside the moving groove 64. A limiting ring 67 is fixedly sleeved on the outside of the lower end of the connecting block 66 to limit the connecting block 66 and prevent the connecting block from being moved. 66 is disengaged from the movable groove 64, and a semicircular groove 68 is opened on the side of the mounting frame 65 close to the worm wheel 62, and a worm 69 is arranged inside the semicircular groove 68. Positioning blocks 610 are rotatably arranged at both ends of the worm 69, and the positioning blocks 610 are fixedly installed in the semicircular groove 68. One end of the worm 69 is connected to a motor 611, and the worm 69 cooperates with the worm wheel 62. The worm 69 is controlled to rotate by the motor 611, and the worm 69 is meshed with the worm wheel 62, so that the worm 69 moves along the trajectory of the worm wheel 62, driving the mounting frame 65 to rotate with the center of the worm wheel 62 as the center point, so as to adjust the inclination angle of the backrest 5. When the mounting frame 65 rotates, the connecting block 66 moves along the movable groove 64 to limit the mounting frame 65, so that it moves more smoothly.

[0027] The lifting assembly 2 includes a sleeve 21 arranged on the top of the fixed seat 1, a lifting pneumatic cylinder 22 is arranged inside the sleeve 21, a push rod 23 is connected to the output end of the lifting pneumatic cylinder 22, a support tube 24 is arranged on the top of the push rod 23, the support tube 24 is movably arranged inside the sleeve 21, the upper end of the support tube 24 extends to the outside of the sleeve 21, and a base 3 is installed thereon. The push rod 23 is controlled by the lifting pneumatic cylinder 22 to drive the base 3 on the support tube 24 to move up and down, thereby adjusting the height of the office chair.

[0028] A telescopic rod 7 is provided on the base 3, and the telescopic rod 7 is rotatably connected to the front side of the backrest 5 through a hinge 71. The backrest 5 is connected and supported by the telescopic rod 7, so that the backrest 5 is more stable when positioned.

[0029] A movable groove 31 is provided at the top of the base 3, and an electric guide rail 8 is arranged inside the movable groove 31. A slider 81 is provided on the outer sliding sleeve of the electric guide rail 8. The top of the slider 81 is connected to the bottom side of the seat cushion 4. The movement of the slider 81 is controlled by the electric guide rail 8, so that the slider 81 drives the seat cushion 4 to move laterally, so that the extension of the seat cushion 4 cooperates with the inclination of the backrest 5, thereby improving the comfort of the user when using it.

[0030] A slide groove 32 is provided at the top of the base 3 between the movable grooves 31 , and a roller 9 is provided inside the slide groove 32 . The roller 9 is installed at the bottom of the seat cushion 4 . The roller 9 supports the seat cushion 4 and makes the movement of the seat cushion 4 smoother and more labor-saving.

[0031] Armrests are rotatably provided on both sides of the seat cushion 4, and a control panel 10 is provided on the armrests. The control panel 10 is electrically connected to the lifting component 2, the adjustment component 6 and the electric guide rail 8. The adjustment of the backrest 5 and the seat cushion 4 can be controlled through the control panel 10.

[0032] Working principle: First, the worm 69 is controlled to rotate by the motor 611, and the worm 69 is meshed with the worm wheel 62, so that the worm 69 moves along the trajectory of the worm wheel 62, driving the mounting frame 65 to rotate with the center of the worm wheel 62 as the center point, so as to adjust the inclination angle of the backrest 5 to meet the user's own needs, and the movement of the slider 81 is controlled by the electric guide rail 8, so that the slider 81 drives the seat cushion 4 to move horizontally, so that the extension of the seat cushion 4 cooperates with the inclination of the backrest 5, thereby improving the comfort of the user when using it.

[0033] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A backrest inclination adjustment structure for an office chair, comprising a fixed seat (1), characterized in that: A lifting assembly (2) is arranged on the top of the fixing seat (1), a base (3) is installed on the top of the lifting assembly (2), a seat cushion (4) is movably arranged above the base (3), a backrest (5) is installed on the base (3) at the rear end of the seat cushion (4), and an adjustment assembly (6) is connected to the lower end of the backrest (5); The adjustment component (6) comprises a semi-cylindrical block (61) arranged at the rear end of the base (3), a worm gear (62) is fixedly arranged on the outside of the semi-cylindrical block (61), semi-circular ring blocks (63) are connected to both ends of the semi-cylindrical block (61), a moving groove (64) is penetrated through the top of the semi-circular ring block (63), a mounting frame (65) is arranged above the semi-cylindrical block (61) and the semi-circular ring block (63), the top of the mounting frame (65) is connected to the backrest (5), and connecting blocks (66) are arranged on both sides of the lower end of the mounting frame (65). The block (66) is movably arranged inside the movable groove (64); the lower end of the connecting block (66) is fixedly sleeved with a limiting ring (67); a semicircular groove (68) is provided on one side of the mounting frame (65) close to the worm wheel (62); a worm (69) is provided inside the semicircular groove (68); positioning blocks (610) are rotatably arranged at both ends of the worm (69); the positioning blocks (610) are fixedly installed in the semicircular groove (68); one end of the worm (69) is connected to a motor (611); and the worm (69) cooperates with the worm wheel (62).

2. The backrest inclination adjustment structure of an office chair according to claim 1, characterized in that: The lifting assembly (2) comprises a sleeve (21) arranged on the top of the fixed seat (1), a lifting pneumatic cylinder (22) is arranged inside the sleeve (21), the output end of the lifting pneumatic cylinder (22) is connected to a push rod (23), a support cylinder (24) is arranged on the top of the push rod (23), the support cylinder (24) is movably arranged inside the sleeve (21), and a base (3) is installed on the upper end of the support cylinder (24).

3. The backrest inclination adjustment structure of an office chair according to claim 1, characterized in that: The base (3) is provided with a telescopic rod (7), and the telescopic rod (7) is rotatably connected to the front side of the backrest (5) via a hinge (71).

4. The backrest inclination adjustment structure of an office chair according to claim 1, characterized in that: The top of the base (3) is provided with a movable groove (31), the interior of the movable groove (31) is provided with an electric guide rail (8), the outer sliding sleeve of the electric guide rail (8) is provided with a slider (81), and the top of the slider (81) is connected to the bottom side of the seat cushion (4).

5. The backrest inclination adjustment structure of an office chair according to claim 4, characterized in that: A slide groove (32) is provided on the top of the base (3) between the movable grooves (31), a roller (9) is provided inside the slide groove (32), and the roller (9) is installed at the bottom of the seat cushion (4).

6. The backrest inclination adjustment structure of an office chair according to claim 1, characterized in that: Armrests are rotatably provided on both sides of the seat cushion (4), and control panels (10) are provided on the armrests.

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