Office chair back adjusting device

Abstract

The utility model discloses a chair back adjusting device of an office chair. The chair back adjusting device comprises a chassis, a chair seat, an adjustable chair back assembly and a gear type angle adjusting mechanism, and a chair seat is fixedly mounted on the chassis. The adjustable chair back assembly is assembled on one side of the chassis and comprises a chair back frame. The gear type angle adjusting mechanism is assembled between the chair back frame and the chassis and comprises a chair back connecting piece, an angle adjusting rotating shaft is fixedly connected to the side, away from the chair back frame, of the chair back connecting piece and rotationally connected with the chassis, and an adjusting worm gear is fixedly connected to the side, located in the chassis, of the angle adjusting rotating shaft. And an adjusting worm is meshed below the adjusting worm gear. According to the utility model, the elevation angle of the chair back of the office chair is adjusted by adopting the gear type angle adjusting mechanism, and the elevation angle of the chair back of the office chair can be adjusted in a large range by adopting a manual adjusting mode, so that the accuracy and the safety of adjusting the angle of the chair back of the office chair are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of office chair backrest adjustment, and in particular relates to an office chair backrest adjustment device. Background Art

[0002] An office chair is a type of chair that assists people in their daily life and work. It is usually composed of casters, chair legs, gas rods, chassis, seat, chair back, lumbar pillow and headrest. Among them, the chair back is a component used to provide auxiliary support for the user's back.

[0003] With the diversification of user needs, office chairs are gradually developing in the direction of multi-functions. At present, most office chairs mainly use springs, gas rods and other components to connect the chair back and the chassis. The chair back angle is adjusted by spring deformation or cylinder extension. By adjusting the chair back angle, users can lie down and rest on the office chair, thereby improving the comfort of office chairs.

[0004] In the prior art, when adjusting the backrest angle of most office chairs, the user needs to sit on the office chair and control the backrest angle by using the user's own gravity to adjust the backrest angle. Although this method can adjust the backrest angle of the office chair within a certain range, it has the problem of poor adjustment accuracy and safety.

[0005] When adjusting the tilt angle of the office chair, the user only relies on leaning back to adjust the chair back, and cannot adjust the office chair back to a fixed angle according to actual needs. At the same time, when the office chair back is adjusted by the user leaning back, the office chair is prone to tipping over or the user's head colliding with external objects.

[0006] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content

[0007] The utility model aims to provide an office chair backrest adjustment device, which can improve the accuracy and safety of office chair backrest adjustment.

[0008] In order to achieve the above purpose, the technical solution provided by a specific embodiment of the utility model is as follows:

[0009] A backrest adjustment device for an office chair comprises a chassis, a seat, an adjustable backrest component and a gear-type angle adjustment mechanism.

[0010] A seat is fixedly mounted on the chassis.

[0011] The adjustable chair back assembly is assembled on one side of the chassis. The adjustable chair back assembly comprises a chair back frame. A chair back is fixedly connected to one side of the chair back frame close to the chassis. Armrest frames are hinged on both sides of the chair back frame.

[0012] The gear-type angle adjustment mechanism is installed between the seat back frame and the chassis, and the gear-type angle adjustment mechanism includes a seat back connecting part, which is hinged to the seat back frame, and the side of the seat back connecting part away from the seat back frame is fixedly connected with an angle adjustment shaft, and the angle adjustment shaft is rotatably connected to the chassis, and the side of the angle adjustment shaft located in the chassis is fixedly connected with an adjusting worm gear, and an adjusting worm is meshed below the adjusting worm gear, and the adjusting worm is rotatably connected to the chassis.

[0013] In one or more embodiments of the utility model, an armrest is fixedly connected to the upper part of the pair of armrest frames. The armrest is used to support the user's arm. A support lever is hinged at one end of the pair of armrest frames away from the chair back frame. The support lever plays a role of supporting and limiting the armrest frames.

[0014] In one or more embodiments of the utility model, an assembly rod is hinged at one end of the support lever away from the armrest frame, and the assembly rod is fixedly connected to the outer wall of the chassis. The support lever is assembled and limited by the assembly rod, and the armrest is supported and limited by the mutual cooperation between the support lever and the armrest frame, so that the armrest frame can be adaptively adjusted with the adjustment of the chair back frame angle, thereby improving the comfort of the armrest in supporting the user's arm.

[0015] In one or more embodiments of the utility model, one end of the adjusting worm is connected to a transmission shaft. The adjusting worm is driven by the transmission shaft. A driving bevel gear is fixedly connected to the outer side of the transmission shaft. The driving bevel gear drives the transmission shaft. One end of the transmission shaft away from the adjusting worm is rotatably connected to a rotating shaft fixing seat, and the rotating shaft fixing seat is fixedly connected to the inner wall of the chassis. The transmission shaft is assembled and limited by the rotating shaft fixing seat, thereby improving the transmission stability of the transmission shaft.

[0016] In one or more embodiments of the utility model, a transmission bevel gear is meshed on one side of the driving bevel gear. The transmission bevel gear plays a role in transmitting the power of the adjustment drive rod. An adjustment drive rod is fixedly connected inside the transmission bevel gear, the adjustment drive rod penetrates the chassis, and the adjustment drive rod is rotatably connected to the side wall of the chassis. The adjustment drive rod plays a role in supporting, fixing and rotating the transmission bevel gear.

[0017] In one or more embodiments of the utility model, the end of the adjustment driving rod outside the chassis is fixedly connected to an adjustment hand wheel. The adjustment driving rod is rotationally driven by controlling the rotation of the adjustment hand wheel, so as to facilitate the adjustment and control of the elevation angle of the seat back frame. A scale identification plate is fixedly connected to the side wall of the chassis, and the scale identification plate is sleeved on the outer side of the adjustment driving rod. The rotation angle of the adjustment hand wheel is compared and identified by the scale identification plate, so as to improve the accuracy of the elevation angle adjustment of the seat back frame.

[0018] Compared with the prior art, the utility model uses a gear-type angle adjustment mechanism to adjust the inclination angle of the office chair backrest, and can manually adjust the inclination angle of the office chair backrest in a wide range, thereby improving the accuracy and safety of the angle adjustment of the office chair backrest. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a front cross-sectional view of an office chair back adjustment device in one embodiment of the utility model;

[0021] Figure 2 A bottom sectional view of an office chair back adjustment device in one embodiment of the utility model;

[0022] Figure 3 for Figure 2 Schematic diagram of the structure at A in the middle;

[0023] Figure 4 It is a partial structural stereogram of an office chair backrest adjustment device in one embodiment of the utility model;

[0024] Figure 5 for Figure 4 Schematic diagram of the structure at B in the middle;

[0025] Figure 6 It is a side cross-sectional view of an office chair back adjustment device in one embodiment of the utility model;

[0026] Figure 7 It is a three-dimensional diagram of an office chair back adjustment device in one embodiment of the utility model.

[0027] Description of main reference numerals:

[0028] 1-chassis, 101-seat, 2-adjustable chair back assembly, 201-chair back frame, 202-chair back, 203-armrest frame, 204-armrest, 205-support remote rod, 206-assembly rod, 3-gear type angle adjustment mechanism, 301-chair back connecting piece, 302-angle adjustment shaft, 303-adjusting worm gear, 304-adjusting worm, 305-transmission shaft, 306-driving bevel gear, 307-shaft fixing seat, 308-transmission bevel gear, 309-adjusting drive rod, 310-adjusting handwheel, 311-scale identification plate. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0030] like Figures 1 to 7 As shown, an office chair backrest adjustment device in one embodiment of the utility model includes: a chassis 1, a seat 101, an adjustable backrest assembly 2, and a gear-type angle adjustment mechanism 3.

[0031] like Figure 1 As shown, a seat 101 is fixedly mounted on the chassis 1. The seat 101 supports and limits the user's buttocks.

[0032] like Figure 1 As shown, the adjustable backrest assembly 2 is assembled on one side of the chassis 1, and the adjustable backrest assembly 2 includes a backrest frame 201. The backrest 202 is supported and fixed by the backrest frame 201. At the same time, the backrest 202 can be adjusted in elevation by adjusting the backrest frame 201.

[0033] like Figure 1 As shown, a side of the chair back frame 201 close to the chassis 1 is fixedly connected with a chair back 202. The chair back 202 supports and limits the back of the user.

[0034] like Figure 1 As shown, both sides of the chair back frame 201 are hinged with armrest frames 203. The armrest frames 203 play a role in supporting and fixing the armrest 204.

[0035] like Figure 1 As shown, a pair of armrest frames 203 are fixedly connected with armrests 204 on their tops. The armrests 204 are used to support the user's arms.

[0036] like Figure 6 to Figure 7 As shown, one end of a pair of armrest frames 203 away from the chair back frame 201 is hinged with a support lever 205. The support lever 205 plays a role of supporting and limiting the armrest frames 203.

[0037] like Figure 6 to Figure 7 As shown, an end of the support lever 205 away from the armrest frame 203 is hinged with an assembly rod 206, and the assembly rod 206 is fixedly connected to the outer wall of the chassis 1. The support lever 205 is assembled and limited by the assembly rod 206, and the armrest 204 is supported and limited by the mutual cooperation between the support lever 205 and the armrest frame 203, so that the armrest frame 203 can be adaptively adjusted with the adjustment of the angle of the chair back frame 201, thereby improving the comfort of the armrest 204 supporting the user's arm.

[0038] like Figure 7 As shown, the gear-type angle adjustment mechanism 3 is assembled between the seat back frame 201 and the chassis 1, and the gear-type angle adjustment mechanism 3 includes a seat back connector 301, and the seat back connector 301 is hinged to the seat back frame 201. The chassis 1 and the seat back frame 201 are connected and fixed by the seat back connector 301. At the same time, the angle of the seat back 202 can be adjusted by adjusting the elevation angle of the seat back connector 301.

[0039] like Figure 7 As shown, the side of the backrest connecting member 301 away from the backrest frame 201 is fixedly connected with an angle adjustment shaft 302, and the angle adjustment shaft 302 is rotatably connected to the chassis 1. The angle adjustment shaft 302 plays the role of supporting and fixing the backrest connecting member 301 and adjusting the angle.

[0040] like Figure 1 As shown, an angle adjustment shaft 302 is fixedly connected to an adjusting worm wheel 303 on one side of the chassis 1. The angle adjustment shaft 302 is controlled by controlling the rotation of the adjusting worm wheel 303. An adjusting worm 304 is meshed below the adjusting worm wheel 303, and the adjusting worm 304 is rotationally connected to the chassis 1. The rotation of the adjusting worm 304 controls the rotation of the adjusting worm wheel 303.

[0041] Specifically, the adjusting worm wheel 303 and the adjusting worm 304 have a self-locking function, which facilitates locking and fixing the adjusted seat back 202 .

[0042] like Figures 2 to 5 As shown, one end of the adjusting worm 304 is connected to a transmission shaft 305. The transmission shaft 305 drives the adjusting worm 304 to rotate.

[0043] like Figures 2 to 5 As shown, a driving bevel gear 306 is fixedly connected to the outer side of the transmission shaft 305. The driving bevel gear 306 drives the transmission shaft 305.

[0044] like Figures 2 to 5 As shown, one end of the transmission shaft 305 away from the adjusting worm 304 is rotatably connected to a shaft fixing seat 307, and the shaft fixing seat 307 is fixedly connected to the inner wall of the chassis 1. The transmission shaft 305 is assembled and limited by the shaft fixing seat 307, thereby improving the transmission stability of the transmission shaft 305.

[0045] like Figures 2 to 5 As shown, a transmission bevel gear 308 is meshed with one side of the driving bevel gear 306. The transmission bevel gear 308 plays the role of transmitting the power of the adjustment driving rod 309.

[0046] like Figures 2 to 5 As shown, an adjustment driving rod 309 is fixedly connected inside the transmission bevel gear 308, and the adjustment driving rod 309 is arranged through the chassis 1, and the adjustment driving rod 309 is rotatably connected to the side wall of the chassis 1. The adjustment driving rod 309 plays the role of supporting, fixing and rotating the transmission bevel gear 308.

[0047] like Figures 2 to 5 As shown, one end of the adjustment driving rod 309 located outside the chassis 1 is fixedly connected with an adjustment hand wheel 310. The adjustment driving rod 309 is rotationally driven by controlling the rotation of the adjustment hand wheel 310, so as to facilitate the adjustment and control of the elevation angle of the seat back frame 201.

[0048] like Figures 2 to 5 As shown, a scale identification plate 311 is fixedly connected to the side wall of the chassis 1, and the scale identification plate 311 is sleeved on the outer side of the adjustment drive rod 309. The rotation angle of the adjustment hand wheel 310 is compared and identified by the scale identification plate 311, thereby improving the accuracy of adjusting the elevation angle of the seat back frame 201.

[0049] In specific use, when the elevation angle of the chair back 202 needs to be adjusted, the user can drive the adjustment drive rod 309 to rotate by manually rotating the adjustment hand wheel 310, and the transmission shaft 305 rotates with the rotation of the adjustment drive rod 309 under the meshing action of the driving bevel gear 306 and the transmission bevel gear 308. The rotation of the transmission shaft 305 drives the adjustment worm 304 to rotate, so that the angle adjustment shaft 302 rotates under the meshing action of the adjustment worm wheel 303 and the adjustment worm 304. The elevation angle of the chair back connector 301 is adjusted by adjusting the angle of the angle adjustment shaft 302.

[0050] During the process of adjusting the elevation angle of the chair back 202, the armrest frame 203 and the support joystick 205 can move accordingly with the movement of the chair back connector 301. The movement of the armrest frame 203 allows the armrest 204 to continue to support the user's arms after the elevation angle is adjusted, thereby improving the reliability and comfort of adjusting the angle of the office chair back.

[0051] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0052] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An office chair back adjustment device, characterized in that: include: A chassis (1), on which a seat (101) is fixedly mounted; An adjustable chair back assembly (2) is mounted on one side of the chassis (1), the adjustable chair back assembly (2) comprising a chair back frame (201), a chair back (202) being fixedly connected to the side of the chair back frame (201) close to the chassis (1), and armrest frames (203) being hingedly connected to both sides of the chair back frame (201); A gear-type angle adjustment mechanism (3) is assembled between the seat back frame (201) and the chassis (1), and comprises a seat back connecting member (301), wherein the seat back connecting member (301) is hingedly connected to the seat back frame (201), a side of the seat back connecting member (301) away from the seat back frame (201) is fixedly connected to an angle adjustment shaft (302), the angle adjustment shaft (302) is rotationally connected to the chassis (1), a side of the angle adjustment shaft (302) located inside the chassis (1) is fixedly connected to an adjustment worm gear (303), an adjustment worm screw (304) is meshed below the adjustment worm gear (303), and the adjustment worm screw (304) is rotationally connected to the chassis (1).

2. The office chair back adjustment device according to claim 1, characterized in that: An armrest (204) is fixedly connected to the top of the pair of armrest frames (203), and a support remote rod (205) is hingedly connected to one end of the pair of armrest frames (203) away from the chair back frame (201).

3. The office chair back adjustment device according to claim 2, characterized in that: An end of the support remote rod (205) away from the handrail frame (203) is hingedly connected with an assembly rod (206), and the assembly rod (206) is fixedly connected to the outer wall of the chassis (1).

4. The office chair back adjustment device according to claim 1, characterized in that: One end of the adjusting worm (304) is drivingly connected to a transmission shaft (305), the outer side of the transmission shaft (305) is fixedly connected to a driving bevel gear (306), one end of the transmission shaft (305) away from the adjusting worm (304) is rotatably connected to a rotating shaft fixing seat (307), and the rotating shaft fixing seat (307) is fixedly connected to the inner wall of the chassis (1).

5. The office chair back adjustment device according to claim 4, characterized in that: A transmission bevel gear (308) is meshed with one side of the driving bevel gear (306), an adjusting driving rod (309) is fixedly connected inside the transmission bevel gear (308), the adjusting driving rod (309) is arranged to penetrate the chassis (1), and the adjusting driving rod (309) is rotatably connected to the side wall of the chassis (1).

6. The office chair back adjustment device according to claim 5, characterized in that: One end of the adjusting driving rod (309) located outside the chassis (1) is fixedly connected to an adjusting hand wheel (310), and a scale identification plate (311) is fixedly connected to the side wall of the chassis (1), and the scale identification plate (311) is sleeved on the outside of the adjusting driving rod (309).

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