Adjustable office chair

Abstract

The utility model belongs to the technical field of office chairs, and particularly relates to an adjustable office chair. The chair comprises a chair seat, a backrest is arranged on one side of the chair seat, armrests are arranged on the two sides of the chair seat, and a supporting frame is rotationally connected to the center of the bottom of the chair seat. The adjusting assembly comprises two groups of strip-shaped frames which are respectively arranged on two sides of the chair seat, two-way screw rods which are rotatably connected to the interiors of the strip-shaped frames, armrest adjusting frames which are in threaded connection to the two-way screw rods, and connecting rods which are used for hinging the armrest adjusting frames and armrests through hinging pieces; a rotating shaft and bevel gears are rotationally connected between the two groups of strip-shaped frames through connecting seats; the bevel gears are coaxially fixed at two ends of the rotating shaft and one end of a bidirectional screw rod; the adjacent rotating shafts are connected with the bevel gears on the two-way lead screws in a meshed mode, and hand wheels are arranged on the rotating shafts. According to the office chair, the armrests on the two sides can be adjusted at the same time, and the adjusting height is kept consistent.

Description

TECHNICAL FIELD

[0001] The utility model belongs to office chair technical field, especially relate to an office chair convenient to adjust armrest. BACKGROUND

[0002] Office chair refers to various chairs equipped for work convenience in daily work and social activities. For example, the Chinese utility model patent with the announcement number CN222055029U discloses a novel office chair. The device moves the moving handle to drive the moving rod, the connecting rod and the connecting ring to move to one side, separates the two fixed pins from the two fixed plates, moves the handrail to drive the extension assembly to move to the appropriate height, loosens the moving handle, drives the moving ring, the moving rod and the connecting rod by the reset spring, engages the two fixed pins with the two fixed plates, and limits the handrail, so that the handrail can be adjusted to the appropriate height as needed.

[0003] However, in actual use, although the office chair can change the height position of the handrail as needed, it is troublesome to adjust the two groups of handrails in sequence, and it is difficult to ensure the consistency of the height positions of the two groups of handrails during the adjustment process, which easily increases the discomfort of the user. UTILITY MODEL CONTENT

[0004] The utility model aims at providing an adjustable office chair. The office chair of the utility model can adjust the handrails on both sides at the same time, and the adjustment height is consistent.

[0005] The utility model solves the above problems by adopting the following technical scheme: an adjustable office chair, comprising:

[0006] A seat is provided with a backrest on one side, and an armrest is provided on both sides of the seat. A support frame is rotatably connected to the center of the bottom of the seat.

[0007] An adjustment assembly includes two groups of strip frames arranged on both sides of the seat, a bidirectional screw rod rotatably connected inside the strip frame, a handrail adjustment frame screw-connected on the bidirectional screw rod, a connecting rod hingedly connecting the handrail adjustment frame and the handrail through a hinge, a rotating shaft rotatably connected between the two strip frames through a connecting seat, bevel gears coaxially fixed on both ends of the rotating shaft and one end of the bidirectional screw rod; the bevel gears on the adjacent rotating shaft and the bidirectional screw rod are meshed and connected, and a hand wheel is provided on the rotating shaft.

[0008] The application realizes the adjustment of synchronization promotion, realizes the double-side linkage through single-point control, eliminates the error of artificial partial adjustment, the high consistency makes the elbow support symmetrical, reduces the muscle fatigue incidence, and the bevel gear transmission system has the self-locking characteristic, prevents the accidental displacement in use.

[0009] Further preferably, the adjustment assembly further comprises at least two groups of sliding rods fixedly connected on both sides of the seat, a sliding frame slidingly connected on the sliding rods, first screw holes arranged on the sliding rods, second screw holes arranged on the sliding frame, and fixing bolts for screwing the second screw holes and the first screw holes.

[0010] Further preferably, the top of the backrest is fixedly connected with a headrest through a connecting column.

[0011] Further preferably, the headrest has an arc-shaped protruding structure.

[0012] Further preferably, the bottom of the support frame is circumferentially movably connected with a plurality of universal wheels.

[0013] Further preferably, the bottom end of the sliding rod is fixedly connected with a limiting plate.

[0014] Further preferably, the universal wheel is provided with a locking member.

[0015] Further preferably, the armrest adjustment frame is slidingly connected between the strip-shaped frame.

[0016] Further preferably, the seat is uniformly provided with a plurality of air holes.

[0017] Further preferably, the upper end of the armrest is fixedly connected with a flexible pad.

[0018] In summary, the utility model has the following advantages:

[0019] 1. The utility model discloses a rotating hand wheel, and the meshing cooperation between the two groups of bevel gears on the same side is used to drive the two groups of bidirectional lead screws to rotate, the bidirectional lead screws drive the two groups of armrest adjustment frames which are screw-connected with the bidirectional lead screws to move towards each other or away from each other, the hinged cooperation between the armrest adjustment frames and the armrests and connecting rods is used to drive the armrests to vertically move upwards or downwards, so that the purpose of simultaneously adjusting the two groups of armrests can be realized, and the consistency of the height after the adjustment of the armrests can be ensured.

[0020] 2. The utility model discloses a fixed bolt is twisted and is pulled out, can remove the connecting and fixing effect between the slide frame and the slide bar, at this moment under the action of gravity, the strip frame will drive the handrail to slide to the lower part of the slide bar, thereby realize the effect of storing the handrail. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 It is the three-dimensional structure schematic diagram of the utility model;

[0022] Fig. 2 It is the longitudinal section three-dimensional structure schematic diagram of the adjusting assembly part of the utility model;

[0023] Fig. 3 It is the three-dimensional schematic diagram of the pivot connecting structure of the utility model.

[0024] In the drawings, the components represented by each reference sign are as follows: 1, seat; 2, backrest; 3, handrail; 4, support frame; 5, headrest; 6, universal wheel; 7, limiting plate; 8, air hole; 101, slide bar; 102, slide frame; 103, first screw hole; 104, fixed bolt; 105, strip frame; 106, bidirectional screw rod; 107, handrail adjusting frame; 108, connecting rod; 109, pivot; 110, bevel gear. DETAILED DESCRIPTION

[0025] The utility model will be further explained in detail in connection with the drawings.

[0026] The specific embodiment is only the explanation of the utility model, and it is not the limitation of the utility model, and the person skilled in the art can make the modification without the creative contribution according to the need after reading the present specification, but as long as in the right claim range of the utility model, it is protected by the patent law.

[0027] Embodiment:

[0028] Please combine Figs. 1-3 The adjustable office chair of the embodiment comprises a seat 1, one side of the seat 1 is provided with a backrest 2, the upper sides of the seat 1 are provided with handrails 3, the bottom center of the seat 1 is rotationally connected with a support frame 4, the top of the backrest 2 is fixedly connected with a headrest 5 through a connecting column, the headrest 5 can provide support for the neck of a user, the surface of the headrest 5 is designed in an arc-shaped convex structure, which is convenient for fitting the neck of a user, the bottom of the support frame 4 is equidistantly and circumferentially movably connected with universal wheels 6, the universal wheels 6 are additionally provided with locking pieces, the universal wheels 6 are convenient for moving the office chair, the locking pieces can lock the universal wheels 6 to increase the stability of the office chair when in use, the seat 1 is uniformly provided with air holes 8, which can increase the air permeability when a user sits down, avoiding the occurrence of a stuffy feeling, and the upper surface of the handrail 3 is fixedly connected with a flexible pad, which can increase the comfort.

[0029] The adjusting assembly for adjusting the armrest 3 comprises four groups of slide rods 101 symmetrically fixed on both sides of the seat 1, slide frames 102 slidably connected outside the slide rods 101, first screw holes 103 formed in the upper and lower parts of the slide rods 101, second screw holes formed in the slide frames 102, the same fixed bolts 104 threadedly connected with the first screw holes 103 on the same horizontal line on the same side, the same strip frames 105 fixedly connected with the bottom parts of the slide frames 102 on the same side, bidirectional screw rods 106 rotatably connected inside the strip frames 105, armrest adjusting frames 107 threadedly connected outside the bidirectional screw rods 106 on both sides, connecting rods 108 hingedly connected between the armrest adjusting frames 107 and the armrest 3, a rotating shaft 109 rotatably connected between the strip frames 105 on both sides through a connecting seat, bevel gears 110 coaxially fixedly connected with both ends of the rotating shaft 109 and one end of the bidirectional screw rod 106 and meshingly connected between the two groups of bevel gears 110 on the same side, a hand wheel fixedly sleeved outside the rotating shaft 109, a limiting plate 7 fixedly connected with the bottom end of the slide rod 101 to prevent the slide frame 102 from being separated from the slide rod 101, the two groups of bidirectional screw rods 106 being mirror-symmetrically arranged, the armrest adjusting frames 107 being slidably connected between the strip frames 105 to guide the movement of the armrest adjusting frames 107.

[0030] In the embodiment, the rotating shaft 109 is driven to rotate by rotating the hand wheel, and the two bidirectional screw rods 106 are driven to synchronously rotate by the meshing transmission of the coaxial bevel gear 110 groups. The rotation of the bidirectional screw rods 106 causes the two armrest adjusting frames 107 on both sides to make mirror-symmetric linear displacement along the strip frames, and the linear motion is converted into lifting motion of the armrest 3 through the connecting rod mechanism. The bevel gear 110 groups form a mechanical linkage system to ensure that the two bidirectional screw rods 106 keep the same turning direction and speed, and the bidirectional screw rods 106 are symmetrically arranged in the screw thread direction to keep the two armrest adjusting frames on both sides from rising and falling at the same time. The cooperation of the slide rod 101 and the slide frame 102 provides vertical guidance, and the fixed bolt 104 ensures stability through screw hole locking.

[0031] In the embodiment, the implementation principle of the adjustable office chair is as follows: when the armrest 3 needs to be adjusted, the two groups of bidirectional screw rods 106 are driven to rotate by rotating the hand wheel and the meshing action between the two groups of bevel gears 110 on the same side, the two groups of armrest adjusting frames 107 connected with the bidirectional screw rods 106 are driven to move towards or away from each other by the rotation of the bidirectional screw rods 106, and the armrest 3 is driven to vertically move upwards or downwards by the hinged action between the armrest adjusting frames 107 and the connecting rod 108, so that the two groups of armrests 3 can be simultaneously adjusted, and the consistency of the height of the armrests 3 after adjustment can be ensured.

[0032] When it is necessary to store the armrest 3, the connecting and fixing effect between the sliding frame 102 and the slide rod 101 can be released by unscrewing and pulling out the fixing bolt 104, at this time, under the action of gravity, the strip frame 105 will drive the armrest 3 to slide to the lower part of the slide rod 101, thereby realizing the effect of storing the armrest 3, avoiding the influence of the armrest 3 on work, and further improving the practical effect of the office chair. Conversely, the armrest 3 can be unfolded, and the office chair can be moved conveniently through the rotating action of the universal wheel 6. In addition, the universal wheel 6 can be locked by the locking piece to increase stability.

[0033] In addition, further improvements are that the backrest 2 is designed in a streamlined structure, which is convenient for fitting the back of the user to increase comfort.

[0034] In addition, the same or similar reference signs are used as far as possible in the drawings and the description to refer to the same or similar parts or steps. The drawings are presented in a simplified form and are not drawn to scale. Directional terms such as top, bottom, front, back, left, right, front, back, upward, upward, upward, downward, downward, rear and front may be used in the drawings for convenience and clarity. These and similar directional terms should not be interpreted as limiting the scope of the disclosure in any way.

Claims

1. An adjustable office chair, characterized in that, Include: Chair seat (1), one side of the chair seat (1) is provided with a backrest (2), both sides of the chair seat (1) are provided with armrests (3), and the bottom center of the chair seat (1) is rotatably connected with a support frame (4); Adjusting assembly, the adjusting assembly comprises two groups of strip-shaped frames (105) arranged on both sides of the chair seat (1), respectively, a bidirectional screw rod (106) rotatably connected in the strip-shaped frame (105), an armrest adjusting frame (107) threadedly connected on the bidirectional screw rod (106), a connecting rod (108) hingedly connecting the armrest adjusting frame (107) and the armrest (3), a rotating shaft (109) rotatably connected between the two strip-shaped frames (105) through the connecting seat, and a bevel gear (110) coaxially fixed on both ends of the rotating shaft (109) and one end of the bidirectional screw rod (106); the bevel gears (110) on the adjacent rotating shaft (109) and the bidirectional screw rod (106) are meshed and connected, and the rotating shaft (109) is provided with a hand wheel.

2. An adjustable office chair according to claim 1, characterized in that The adjusting assembly further comprises at least two groups of slide rods (101) fixedly connected on both sides of the chair seat (1), a sliding frame (102) slidably connected on the slide rod (101), a first screw hole (103) arranged on the slide rod (101), a second screw hole arranged on the sliding frame (102), and a fixing bolt (104) used for screwing the second screw hole and the first screw hole (103).

3. An adjustable office chair according to claim 1, wherein, The top of the backrest (2) is fixedly connected with a headrest (5) through a connecting column.

4. An adjustable office chair according to claim 3, wherein, The headrest (5) has an arc-shaped convex structure.

5. An adjustable office chair according to claim 1, wherein, The bottom of the support frame (4) is circumferentially movably connected with a plurality of universal wheels (6).

6. An adjustable office chair according to claim 2, wherein, The bottom end of the slide rod (101) is fixedly connected with a limiting plate (7).

7. An adjustable office chair according to claim 5, wherein, The universal wheel (6) is provided with a locking member.

8. An adjustable office chair according to claim 1, wherein, The armrest adjusting frame (107) and the strip-shaped frame (105) are slidably connected.

9. An adjustable office chair according to claim 1, wherein, The chair seat (1) is uniformly provided with a plurality of air holes (8).

10. An adjustable office chair according to claim 1, wherein, The armrest (3) is fixedly connected with a flexible pad.

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