Swivel chair with adjustable backrest

Abstract

The utility model relates to a swivel chair, in particular to a swivel chair with an adjustable backrest. Belongs to the technical field of office chairs. The swivel chair comprises chair legs, air column springs mounted on the chair legs, a tray arranged at the upper ends of the air column springs, and a chair seat, armrests and a backrest which are arranged based on the tray, the tray comprises a tray body and a rotating body hinged to the tray body, and the backrest is installed on the rotating body. The rotating body provided with the backrest is adjusted through the second air column spring, only several limited parts such as the supporting shaft and the rotating shaft are involved, and the large-inclination-angle adjusting device has the advantage of being simple in structure while large-inclination-angle adjusting of the backrest of the swivel chair is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a swivel chair, especially a swivel chair with adjustable backrest. It belongs to the technical field of office chairs. BACKGROUND

[0002] Swivel chair is a common seat in office, usually with adjustable seat height. In order to improve the comfort during use, people have developed the function of adjusting the angle of backrest. Further development is the free chair, which installs the backrest to the movable part of the tray, installs the spring on the tray and loads the spring to the movable part. The user needs to exert a certain force to overcome the resistance of the spring to change the angle of the backrest. When the force exerted by the user is a variable, the angle of the backrest changes frequently in a slightly inclined state, which can make the user feel relaxed and comfortable. "Free" is often used to describe the state of being unrestrained and leisurely, so this type of chair is named free chair. However, the adjustable angle of the backrest of the free chair is limited, usually only between 90°~75°, which is suitable for relaxation but not for a short rest. Lunch break is a common need for office users, and it is necessary to provide a swivel chair suitable for a short rest.

[0003] In order to meet the needs of lunch break, it is very important to further lower the swivel backrest. The chair with large-angle adjustable backrest in the prior art is usually a seat rather than a swivel chair. It is relatively easy to achieve large-angle adjustment of the backrest in the seat. The bottom of the swivel chair is a five-star chair leg, a gas spring support column and a tray. Due to structural limitations, the improvement of the function of the swivel chair depends on the technological progress of the tray. In the prior art swivel chair, the so-called adjustable backrest usually refers to adjusting the size of the spring restoring force, that is, adjusting the size of the force that triggers the change of the angle of the backrest to meet the needs of users with different needs.

[0004] The invention patent with the authorized announcement number CN102133003B discloses a structure of swivel chair with stepless reclining adjustment. It includes a seat plate and a backrest, the bottom of the seat plate is fixedly installed with a bottom disc, the backrest is rearwardly and upwardly movably hinged with the bottom disc through a tail plate, at least one reclining adjustment spring plate is fixedly bridged at the front and rear ends of the bottom disc along the length extension direction, the tail plate is pressure-connected with the rear end of the reclining adjustment spring plate through a transverse rod, the bottom disc is fixedly provided with a worm, the worm is sleeved with a worm gear box which can slide forward and backward along the worm, the worm gear box is extended with a sliding fulcrum seat which abuts against the bottom end of the reclining adjustment spring plate, the sliding fulcrum seat can slide along the length extension direction of the reclining adjustment spring plate, and the worm gear box is further connected with an adjusting handle which adjusts the sliding of the worm gear box along the worm. The swivel chair realizes large-angle adjustment of the backrest, and the comfort during use is improved. However, its structure is very complex, and the production and maintenance costs are high. UTILITY MODEL CONTENTS

[0005] The utility model provides a swivel chair with adjustable backrest in view of the problems presented by the background art. The swivel chair has simple structure and supports large-angle adjustment of the backrest, and is suitable for afternoon rest.

[0006] The technical scheme for solving the above problems is as follows:

[0007] A swivel chair with adjustable backrest comprises a chair leg, a gas column spring mounted on the chair leg, a tray provided at the upper end of the gas column spring, and a seat, an armrest and a backrest provided based on the tray. The tray comprises a tray body and a rotating body hinged to the tray body, and the backrest is mounted on the rotating body.

[0008] Preferably, the bottom of the tray body is provided with a support shaft, and the rotating body is provided with a rotating shaft. The utility model further comprises a second gas column spring, and the two ends of the second gas column spring are hinged to the support shaft and the rotating shaft through first and second mounting members.

[0009] The utility model adjusts the rotating body provided with the backrest through the second gas column spring, and only involves limited components such as the rotating body, the support shaft, the rotating shaft and the second gas column spring, thereby achieving the technical purpose and having the advantage of simple structure.

[0010] Preferably, the utility model further comprises a second gas column spring control rod, which is rotatably arranged on the second mounting member and abuts against the control end of the second gas column spring.

[0011] The above technical scheme of the utility model further controls the control end of the second gas column spring through the second gas column spring control rod to control the backrest to be locked at any angle within the range, thereby having the advantage of convenient use.

[0012] Preferably, the bottom of the tray body forms a limiting part, and the rotating body is provided with a recessed part corresponding to the limiting part.

[0013] The above technical scheme of the utility model forms the limiting part on the tray to limit the rotating body at the maximum rotating angle, thereby avoiding excessive inclination adjustment and causing discomfort to the user. Meanwhile, the recessed part is arranged at the corresponding position of the rotating body to improve the rotating angle of the backrest.

[0014] Preferably, the limiting part is integrally connected with the mounting seat of the support shaft.

[0015] Preferably, the limiting part is coaxially arranged with the support shaft.

[0016] As preferred, the backrest comprises a backrest body and a mesh layer covering the backrest body; a lower part of the backrest body is protruded forward to form a lumbar support part; a lower part of the lumbar support part and the backrest body are connected to form a bending part for accommodating the end of the seat.

[0017] The technical scheme of the backrest of the utility model, through setting the lumbar support part, the user's lumbar is supported to improve the comfort; meanwhile, the bending part is set to abut against the columnar arc surface of the rear end of the seat in the upright state to make the connection, so that the appearance is beautiful and the practicability is increased, such as when the article in the user's pocket falls, the article is received, and when the user adds the lumbar support, the support is provided.

[0018] As preferred, the backrest is connected with the rotating body through a backrest mounting part; the backrest mounting part comprises a tray mounting part fixed with the rotating body from below and a backrest mounting part fixed with the backrest from the back.

[0019] As preferred, the lower end of the backrest is provided with a positioning column, and the backrest mounting part is provided with a positioning hole corresponding to the positioning column.

[0020] The technical scheme of the backrest of the utility model, the positioning column is set to reduce the number of screw rods during the mounting of the backrest, and the convenience of mounting is improved.

[0021] As preferred, the upper end of the backrest is further provided with a plug-in headrest.

[0022] The plug-in headrest can be adjusted according to the height of the user to support the cervical vertebrae when the user uses the swivel chair in a lying position.

[0023] In summary, the utility model has the following beneficial effects:

[0024] 1、The utility model discloses a second gas column spring is used for adjusting the rotating body provided with a backrest, only involves a few limited parts such as a supporting shaft and a rotating shaft, and has the advantages of simple structure while realizing the large inclination angle adjustment of the backrest of the swivel chair.

[0025] 2、The utility model further controls the control end of the second gas column spring through the second gas column spring control rod to make the backrest be locked at any angle within the range, and has the advantage of convenient use.

[0026] 3、The utility model discloses a limiting part is formed on the tray to limit the rotating body at the maximum rotating angle, avoids that the user feels uncomfortable due to the excessive inclination angle adjustment; meanwhile, a recess is arranged on the corresponding position of the rotating body to avoid the design, so as to improve the rotating angle of the backrest.

[0027] 4、The utility model discloses a waist support part is arranged to support the user's waist and improve the comfort degree, and the bending part is arranged to abut against the columnar curved surface of the rear end of the seat in the upright state to realize the connection, so that the appearance is beautiful and the practicability is increased.

[0028] 5、The plug-in headrest can be adjusted according to the height of the user to support the cervical vertebra when the user uses the swivel chair in the lying position. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is the structure schematic diagram of the utility model in the upright state;

[0030] Figure 2 is Figure 1 the local enlarged view of

[0031] Figure 3 is the structure schematic diagram of the utility model in the lying state;

[0032] In the drawings, the component names represented by each reference numeral are as follows:

[0033] 1、chair leg,

[0034] 2、gas column spring,

[0035] 3、tray,

[0036] 4、seat,

[0037] 5、armrest,

[0038] 6、backrest,

[0039] 7、second gas column spring,

[0040] 8、second gas column spring control rod,

[0041] 9、backrest mounting piece,

[0042] 10、headrest,

[0043] 31、tray body,

[0044] 32、rotating body,

[0045] 33、main shaft,

[0046] 61、backrest body,

[0047] 62、waist support part,

[0048] 63、bending part,

[0049] 64、positioning column,

[0050] 311、support shaft,

[0051] 312. Limiting part,

[0052] 321. Rotating shaft,

[0053] 322. Depression. Detailed Implementation

[0054] The present invention will be further explained below with reference to the accompanying drawings.

[0055] 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.

[0056] A swivel chair with an adjustable backrest, such as Figure 1 As shown, the chair includes a chair leg 1, a gas spring 2, a tray 3, a seat 4, armrests 5, and a backrest 6. The chair leg 1 is the most common type of five-star chair leg. The gas spring 2 is a fixed component of the five-star chair leg. The tray 3 is a fixed component of the gas spring 2. The seat 4, armrests 5, and backrest 6 are all based on the tray 3.

[0057] Figure 2 The diagram shown is a structural schematic of the tray 3. Unlike existing technologies, the tray 3 includes a tray body 31 and a rotating body 32. The rotating body 32 is hinged to the tray body 31 and can rotate around the main shaft 33, giving the backrest mounted on the rotating body 32 the function of large-angle adjustment. Figure 3 The diagram shows the backrest when it is lowered to near its limit. As can be seen, the lowering angle of the rotating body 32 is approximately 32°. Combined with the approximately 15° tilt angle of the backrest in its upright position, this results in a large tilt angle of approximately 50°. Furthermore, the backrest adjustment method is a downward swing type rather than a stationary rotation type, which actually produces a near-flat reclining feel. Figure 3 As shown. Compared to rotating in place, the lower-swing design places the center of gravity closer to the geometric center of the swivel chair, thus reducing the risk of leaning backward and solving the problem of the neck not reaching the headrest due to an excessively long backrest. Because of market acceptance and the aesthetics of swivel chairs, a certain backrest length is essential.

[0058] Figure 2 The specific structure of the tray is further described. For example... Figure 2As shown, the bottom of the tray body 31 is provided with a support shaft 311, and the rotating body 32 is provided with a rotating shaft 321. The second gas column spring 7 has two ends, i.e. a mounting end and an extension end. The mounting end is fixed to the support shaft 311 through a first mounting piece, and the extension end is fixed to the rotating shaft 321 through a second mounting piece. Further, the second gas column spring control rod 8 is arranged on the second mounting piece to control the extension state of the second gas column spring 7 and to be locked. The second gas column spring control rod 8 can be a conventional gas spring in the prior art, as long as the size meets the requirements. Such a gas spring has a self-locking function. When there is no external force acting on the control end head of the extension end of the gas spring, it is self-locked. When adjustment is needed, the control end head can be poked by the second gas column spring control rod 8, and the original length of the gas spring is kept in a force and elastic force balance state. When the force is greater than the elastic force, the gas spring is compressed. When the force is less than the elastic force, the gas spring is elongated. When the required length is adjusted, the second gas column spring control rod 8 is released to lock the second gas column spring 7 again.

[0059] In order to limit the maximum adjustment angle of the backrest 6, a limiting portion 312 is formed at the bottom of the tray body 31. When the lower edge of the rotating body 32 touches the limiting portion 312, the rotating body 32 cannot be rotated any more, thereby achieving control of the maximum adjustment angle of the backrest 6. At the same time, the second gas column spring 7 is also protected from being compressed too much, and the rotation angle of the second gas column spring 7 under the influence of the rotation of the rotating body is reduced, thereby improving the stability of the related components.

[0060] At the same time, in order to ensure a large rotation angle required by the user, the rotating body 32 is provided with a recessed portion 322 corresponding to the limiting portion 312. The recessed portion 322 can appropriately increase the rotation angle of the rotating body 32 on the basis of the original design, so as to improve the comfort in a lying position.

[0061] In order to simplify the design, the limiting portion 312 is integrally connected with the mounting seat of the support shaft 311. Further, the limiting portion 312 is coaxially arranged with the support shaft 311.

[0062] The backrest 6 comprises a backrest body 61 and a net surface layer covering the backrest body. In order to improve the comfort in the upright position and the lying position, the lower part of the backrest body 61 is protruded forward to form a lumbar support 62; the lower part of the lumbar support 62 and the backrest body 61 form a bend 63 which is convenient for accommodating the end of the seat 4. The lumbar support 62 is arranged to support the waist of the user to improve the comfort. Meanwhile, the bend 63 is arranged to abut against the columnar curved surface of the rear end of the seat in the upright position to make the connection, so that the appearance is beautiful and the practicability is increased, such as receiving the items dropped in the pocket of the user; the bend 63 is arranged to provide support when the user increases the lumbar support in the lying position.

[0063] The utility model further provides simple and convenient installation structure of backrest 6. Backrest 6 is connected with rotating body 32 through backrest mounting piece 9, backrest mounting piece 9 includes the tray mounting portion 91 of solid connection from below with rotating body 32 and the backrest mounting portion 92 of solid connection from back with backrest 6. The lower end of backrest 6 is provided with the locating column 64, and backrest mounting piece 9 is provided with the locating hole corresponding with the locating column 64.

[0064] Considering the necessity of the headrest in the lying position, the utility model also sets the plug-in headrest 10 based on the backrest 6. The plug-in headrest 10 can be adjusted according to the height of the user to adapt to the actual use demand.

Claims

1. A swivel chair with adjustable backrest, comprising a chair leg (1), a gas column spring (2) mounted on the chair leg, a tray (3) arranged at the upper end of the gas column spring, and a seat (4), an armrest (5) and a backrest (6) arranged on the basis of the tray; characterized in that: The tray (3) comprises a tray body (31) and a rotating body (32) hinged with the tray body (31), and the backrest (6) is installed on the rotating body (32).

2. The chair of claim 1, wherein: The bottom of the tray body (31) is provided with a supporting shaft (311), and the rotating body (32) is provided with a rotating shaft (321); further comprising a second gas column spring (7), two ends of the second gas column spring (7) are hinged with the supporting shaft (311) and the rotating shaft (321) through a first mounting member and a second mounting member respectively.

3. The chair of claim 2, wherein: Further comprising a second gas column spring control rod (8), the second gas column spring control rod (8) is rotationally arranged on the second mounting member and abuts against a control end of the second gas column spring (7).

4. The chair of claim 2 wherein: The bottom of the tray body (31) forms a limiting portion (312), and the rotating body (32) is provided with a recessed portion (322) corresponding to the limiting portion (312).

5. The chair of claim 4, wherein: The limiting portion (312) is integrally connected with a mounting seat of the supporting shaft (311).

6. The chair of claim 4 wherein: The limiting portion (312) is coaxially arranged with the supporting shaft (311).

7. The chair of claim 1, wherein: The backrest (6) comprises a backrest body (61) and a mesh surface layer covering the backrest body; the lower part of the backrest body (61) is protruded forward to form a waist rest portion (62); the lower part of the waist rest portion (62) and the junction with the backrest body (61) form a bending portion (63) for accommodating the end of the seat (4).

8. The chair of claim 1, wherein: The backrest (6) is connected with the rotating body (32) through a backrest mounting member (9); the backrest mounting member (9) comprises a tray mounting portion (91) fixedly connected with the rotating body (32) from below and a backrest mounting portion (92) fixedly connected with the backrest (6) from the back.

9. The chair of claim 8, wherein: The lower end of the backrest (6) is provided with a positioning column (64), and the backrest mounting member (9) is provided with a positioning hole corresponding to the positioning column (64).

10. The chair of claim 1, wherein: The upper end of the backrest (6) is further provided with a plug-in headrest (10).

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