CN113331620B - Adjustable office chair for working on table - Google Patents

Abstract

The invention discloses an adjustable office chair for working at a desk, which includes a chair seat and chair legs; the chair legs are connected to a support frame that extends forward and tilts upward, and the front end of the support frame has a horizontal side extending left and right. The bottom surface of the front part of the chair seat is provided with a sleeve structure that is rotated and sleeved on the cross bar; the rear end of the support frame is connected with a jacket structure, and the jacket structure is slidably inserted with a vertically extending guide post ; The jacket structure is equipped with a manual driving mechanism to drive the guide column to slide up and down; a flip support is provided between the top of the guide column and the seat, and the middle or lower part of the flip support is hinged on the top of the guide column and can be used elsewhere. The bottom end serves as a rotation center to flip forward and backward, and the top end of the flip support is fixedly connected to the bottom surface of the chair seat. The beneficial effect of the present invention is that the inclination degree of the chair seat can be adjusted, and it is suitable for users who work at their desks.

Description

An adjustable office chair for desk working

Technical field

The invention relates to an office chair, in particular to an adjustable office chair for working at a desk.

Background technique

In the existing technology, office chairs are increasingly in demand for their comfort and multifunctionality, such as forward and backward tilting, seat adjustment, and chair back adjustment.

For example, the prior art publication number CN109349844A discloses an office chair suitable for sedentary people, including an office chair body, the left and right sides of the office chair body are fixedly installed with armrests, and the bottom of the office chair body is fixedly installed. There is a fixed rod. The end of the fixed rod away from the bottom of the office chair body is fixedly installed with a support leg. The support leg is equipped with a moving wheel in the middle of the end far away from the fixed rod. The inner side of the armrest and the top of the left and right sides of the office chair body are fixedly connected with receiving rods. . This office chair is suitable for sedentary people. Through the combination of slider and chute, the distance between the back plate and the seat plate of the office chair body is effectively adjusted, so that the office chair body is suitable for the height needs of different users. It effectively improves the practicability of the equipment. At the same time, through the combination of the fixing screw and the limit sleeve rod, the adjustment structure is effectively fixed, further improving the stability of the equipment during operation.

For example, the prior art publication number CN108402749A discloses an office chair with high stability, which includes an office chair body. A breathable sponge cushion is installed in the middle of the office chair body, and a lift is installed on one side of the front end of the office chair body. There is a retraction button, a support rod is installed inside the upper side of the office chair body, a fixed guard plate is installed above the support rod, a fixed backrest is installed at the rear end above the office chair body, and the fixed backrest is installed inside A high-elastic protective net is installed at the middle position of the office chair. An automatic rewinding groove is installed at the rear end of the office chair body. A mat pad is installed inside the automatic rewinding groove. The upper fixing frame and the lower fixing frame of the present invention are arranged in a symmetrical structure. The upper fixing frame can stabilize the bottom of the office chair, which can support a larger weight. The lower fixing frame can make the office chair body and the ground more stable, preventing Pour, through symmetry you can make the appearance look more beautiful and stylish.

For another example, the prior art publication number CN210227506U discloses an office chair, which belongs to the field of office desks and includes a main support frame, a support plate, an armrest frame, an office chair backrest, a hydraulic support rod, a bottom bracket, a control rod, and a roller assembly; the roller assembly It includes a roller frame, a rotating shaft, and a roller; the rollers are arranged with a large diameter in the middle and a small diameter on both sides; uniform convex ribs are provided on the outer circumferential surface of the roller; an arc-shaped groove is provided on the back of the office chair backrest for the installation of the rotating shaft; the rotating shaft After being embedded in the arc-shaped groove, the locking block is pressed and fixed, and the locking block is fixed on the back of the office chair backrest through bolts. The office chair of the utility model has a good massage effect, can well correct the sitting posture, and is more close to the spine, making it comfortable and reliable to use; the rotating shaft is embedded in the arc groove and is pressed and fixed by a locking block, and the locking block passes through The bolts are fixed on the back of the office chair backrest to ensure reliable installation of the roller assembly, easy disassembly and assembly, good structural strength, strong locking force, and reliable connection strength.

These office chairs have the following problems: First, the support position of the chair legs for the chair seat is located in the middle of the chair seat, and these office chairs are used in office situations, especially in front of desks. Such users are often used when they are busy at work. Some adopt a forward-leaning sitting posture, with the center of gravity of the upper body relatively far forward and spaced from the position where the chair legs support the seat. After long-term use, problems such as structural damage, aging and deformation may easily occur between the chair seat and chair legs. Secondly, the reclining function of the chair back is poor, and the support for the user's waist is insufficient when reclining, which can easily cause fatigue of the waist muscles and even prone to problems such as lumbar disc bulging. Furthermore, the adjustment function of the chair seat is also poor, and there is no corresponding reasonable adjustment method according to the office application environment.

Contents of the invention

The technical problem to be solved by the present invention is to provide an adjustable office chair for working at the desk, which can adjust the inclination of the chair seat and is suitable for users working at the desk.

The present invention is achieved through the following technical solutions.

An adjustable office chair for working at a desk, including a chair seat and chair legs; the chair legs are connected to a support frame that extends forward and tilts upward, and the front end of the support frame has horizontal bars extending left and right; The bottom surface of the front part of the chair seat is provided with a sleeve structure that is rotated and sleeved on the cross bar; the rear end of the support frame is connected with a jacket structure, and the jacket structure is slidably inserted with a vertically extending guide post; the jacket structure A manual driving mechanism is provided to drive the guide column to slide up and down; a flip support is provided between the top of the guide column and the seat, and the middle or lower part of the flip support is hinged to the top of the guide column, and its bottom end can be used as a rotating The center flips forward and backward, and the top end of the flip support is fixedly connected to the bottom surface of the chair base.

As a further improvement of the present invention, the guide post has a vertically extending rack; the jacket structure has a gap that allows the rack to pass up and down; the driving mechanism includes a pair of holes on the left and right of the jacket structure located on the left and right of the gap. Bearings are provided on both sides respectively, and a transverse rotating shaft is connected between the two bearings. The rotating shaft is fixedly sleeved with a gear meshing with the rack; one end of the rotating shaft is provided with a rocker or a knob cover.

As a further improvement of the present invention, the part of the guide post with the rack is fixedly sleeved with the multi-edge shell; the shape of the inner surface of the jacket structure matches the poly-edge shell.

As a further improvement of the present invention, the flipping support includes two flipping support plates spaced left and right, a flipping shaft arranged transversely and with both ends fixedly connected to the middle portions of the two flipping support plates; the flipping shaft transversely passes through the guide pillars left and right. , the two flipping support plates are clamped on the left and right sides of the guide pillar; the tops of the two flipping support plates are fixedly connected to the bottom surface of the chair seat.

As a further improvement of the present invention, the left and right sides of the guide post clamped by the two flipping support plates are vertical planes flat against the flipping support plates.

As a further improvement of the present invention, the bottom surface of the chair seat is provided with two lugs spaced left and right, and the top ends of the two flip support plates are respectively attached to the two lugs and fixedly connected by at least two fasteners.

As a further improvement of the present invention, the lower parts of the two flipping support plates have arc-shaped grooves, and the arc-shaped grooves have the connection point of the flipping axis on the flipping support plate as the center of the circle; the guide post has an adjustment rod transversely penetrating, Both ends of the adjusting rod pass through two arc-shaped grooves and are threadedly connected with locking nuts that can clamp the two flip support plates.

As a further improvement of the present invention, the thickness of the chair seat gradually widens from the front end to the middle and rear parts, and then gradually decreases from the middle and rear parts to the rear end; the top end of the flip support is fixedly connected to the chair seat. Between the middle and rear part of the bottom surface to the rear end.

As a further improvement of the present invention, the chair legs include a chair leg extending all around and equipped with running wheels, a sleeve vertically fixedly connected to the center of the chair leg, and a support shaft inserted in the sleeve and extending upward. ; The rear end of the support frame is fixedly connected to the upper part of the support shaft; the mounting seat is arranged on the top of the support shaft, and the two are an integrated structure.

Beneficial effects of the present invention:

It is suitable for office users who sit forward. The driving mechanism is used to drive the guide column to slide up and down, so that the inclination of the chair seat can be adjusted so that it can match the sitting posture to a more comfortable level. It is especially suitable for users who work at their desks.

Description of drawings

The preferred embodiments of the present invention will be described in detail below through the accompanying drawings to help understand the purpose and advantages of the present invention, wherein:

Figure 1 is the right view of the office chair in Example 1;

Figure 2 is the front view of the office chair in Example 1;

Figure 3 is a partially enlarged schematic diagram of Figure 1;

Figure 4 is a top view of the cross tube in Example 1;

Figure 5 is the right view of the office chair in Example 2;

Figure 6 is a partially enlarged schematic diagram of Figure 5;

Figure 7 is the rear view of the guide pillar and flip support in Example 2;

Figure 8 is the right view of the office chair in Example 3;

Figure 9 is a front view of the support frame and cross bar in Example 3;

Figure 10 is a rear view of the armrest and chair back in Example 3;

Figure 11 is the rear view of the handrail in Example 3;

Figure 12 is the rear view of the chair back in Example 3;

Figure 13 is a cross-sectional view of the armrest and chair back in Example 3;

Figure 14 is the right view of the office chair in Example 4;

Figure 15 is a partially enlarged schematic diagram of Figure 14;

Fig. 16 is a right side view of the rotation limiting mechanism in Example 4.

Detailed ways

The present invention will be further described in detail below based on the accompanying drawings and implementation examples.

The terms "upper, lower, left, right, front, back, front, back, top, bottom, etc." mentioned or possibly mentioned in this specification are defined relative to the structure shown in each drawing. The words " "Inside" and "outside" refer to the direction toward or away from the geometric center of a specific component respectively. They are relative concepts, and therefore may change accordingly according to their different locations and different usage states. Therefore, these or other directional terms should not be construed as restrictive terms.

Implementation case 1:

Referring to Figures 1-4, an office chair includes a chair base 1 and a chair leg 2; the chair leg 2 is connected to a support frame 11 that extends forward and tilts upward, and the rear end of the support frame 11 passes through a fixed sleeve. The method of connection is fixedly connected to the chair leg 2. The front end of the support frame 11 has a cross bar 12 extending left and right. The bottom surface of the front part of the chair seat 1 is provided with a sleeve structure 13 that is rotatably sleeved on the cross bar 12 so that the chair seat 1 can move the cross bar 12 As the axis of rotation, forward and backward rotation is performed around the crossbar 12 . A movable support 3 is provided between the chair leg 2 and the chair seat 1. The bottom end of the movable support 3 is hinged to the top of the chair leg 2, and its bottom end can be used as a rotation center to flip forward and backward. The top end of the movable support 3 It is slidingly connected to the bottom surface of the chair base 1 and can slide forward and backward along the chair base 1 .

In the office chair of this embodiment, the crossbar 12 provided on the front bottom surface of the chair base 1 not only serves as a rotation axis for forward and backward flipping, but also serves as the support center of the entire chair base 1, which is very suitable for users working at a desk, such as at a computer. Users who work at the front or those who work at the desk usually sit relatively forward and only sit upright on the front half of the chair seat 1, so that the user's overall center of gravity is relatively forward and roughly coincides with the position of the crossbar 12. This avoids problems such as the user's center of gravity and the center of support of the chair base 1 being separated from each other, causing the chair base 1 to flip forward for a long time, causing the structure to be easily damaged, deformed, and other problems that affect the service life.

When the user needs to rest and relax, he can adjust his sitting posture to lean back and sit upright on most of the chair base 1. At this time, the center of gravity moves backward, and the user's upper body can rock back and forth, causing the chair base 1 to flip back and forth, providing the user with a "free and easy" function. . The movable bracket between the chair leg 2 and the chair base 1 plays a role in supporting the two, so that the chair base 1 maintains good stability during the back and forth reversal. At the same time, the bottom end of the movable bracket and the chair leg 2 are hinged. The sliding fit between the top end and the bottom surface of the chair base 1 also makes the chair base 1 smoother in the process of flipping back and forth, and the movable bracket will not jam the chair base 1 .

The movable support 3 includes a movable top plate 31 and two movable support plates 32 spaced left and right formed by extending vertically from the bottom surface of the movable top plate 31. The shape of the movable support plate 32 is roughly triangular, and the front and rear length of the movable top plate 31 is slightly It is larger than the top edge of the movable support plate 32, thereby increasing the contact area with the bottom surface of the chair seat 1, so that its sliding along the front and back is better supported, and the stability is improved. The top of the chair leg 2 is provided with a mounting seat 33. The mounting seat 33 has a front seat head 331 and a rear seat head 332 spaced front and back; a cross tube 34 is provided in the mounting seat 33, and the front section 34-a and the rear section of the cross tube 34 are The ends of 34-b are respectively connected to the front seat head 331 and the rear seat head 332. The bottom ends of the two movable support plates 32 are respectively rotatably sleeved on the left section 34-c and the right section 34-d of the cross tube 34. Through the cross The cross structural feature of the tube 34 is that the left section 34-c and the right section 34-d serve as the left and right "limbs" to realize the hinge of the movable support 3 and the mounting base 33. The front section 34-a and the rear section 34-b serve as The front and rear "limbs" enhance the structural strength of the mounting base 33.

The top surface of the movable top plate 31 has a dovetail groove extending forward and backward, and a mounting plate 35 is fixedly connected to the bottom surface of the seat 1. The bottom surface of the mounting plate 35 has a slide rail 351 extending forward and backward and matching the shape of the dovetail groove. The movable top plate 31 is embedded in the slide rail 351 through a dovetail groove and can slide forward and backward along the slide rail 351 . The mounting plate 35 and the movable top plate 31 are both replaceable parts. By providing the mounting plate 35, the direct contact between the movable top plate 31 and the base is avoided. When damaged, replacement is easy and the replacement cost is low. The front end and rear end of the slide rail 351 respectively have limit blocks 352 that can abut against the movable top plate 31 to limit the front and rear sliding range of the movable top plate 31, thereby limiting the range of the chair seat 1's forward and backward flipping range, thereby preventing safety. Hidden danger.

The front section 34-a and the rear section 34-b of the cross tube 34 pass through the front seat head 331 and the rear seat head 332 respectively, and can slide forward and backward along the mounting seat 33. The front seat head 331 and the rear seat head 332 can be connected with the cross tube. The cross portion 34-e of the cross tube 34 abuts to define the front and rear sliding range of the cross tube 34. The front section 34-a of the cross tube 34 is covered with a return compression spring 36, and its front and rear ends are respectively supported on the front seat head 331 and the cross portion 34-e. The elastic force of the return compression spring 36 can make the cross portion 34-e It abuts against the rear seat head 332. Under the premise that the limiting block 352 limits the preliminary range of the front-to-back flipping range of the seat 1, the forward and backward sliding of the cross tube 34 can also continue to enlarge the front-to-back flipping range of the seat 1 in a smaller range. For example, when the seat 1 is flipped backward, due to the action of the return compression spring 36, the cross portion 34-e of the cross tube 34 is supported by the return compression spring 36, causing it to offset the rear seat head 332. First, the movable top plate 31 slides along the The rail 351 slides forward until it collides with the limit block 352 at the front end. After that, the cross tube 34 slides forward to continue to flip backward. During this process, the return compression spring 36 is gradually compressed to dampen the backward flip of the seat 1. Gradually increases until it stops, thus improving the user's experience. When the movable top 31 slides forward and backward along the slide rail 351, the damping is very small, making the chair base 1 more flexible to flip, which is suitable for the user to relax. When the movable top 31 continues to flip backwards When the cross tube 34 is inserted and slides forward, the return spring plays a buffering role and improves safety.

An elastic washer 37 is fixedly connected to the rear section 34-b of the cross tube 34 close to the root of the cross portion 34-e. When the cross portion 34-e and the rear seat head 332 abut, the elastic washer 37 is supported on both sides. In the meantime, when the seat 1 is turned forward under the action of the return compression spring 36, the cross tube 34 is reset so that the cross portion 34-e and the rear seat head 332 are offset. At this time, the presence of the elastic washer 37 plays a buffering role. , to avoid user frustration and improve comfort.

The thickness of the chair seat 1 gradually widens from the front end to the middle and rear parts, and then gradually decreases from the middle and rear parts to the rear end; the top of the movable support 3 slides back and forth in front of the bottom of the chair seat 1 It is an inclined plane and tilts downward from front to back. When the user uses the "Xiaoyao" function to relax, the crossbar 12 on the front of the chair base 1 is used as the rotation axis, and the middle and rear parts of the chair base 1 receive a greater impact. , therefore for the chair seat 1, the structural strength of the middle and rear parts needs to be strengthened. In this embodiment, by gradually increasing the thickness of the chair seat 1 from front to back, it is possible to set up inside the middle and rear parts of the chair seat 1, for example Reinforce ribs and other structures to enhance its structural strength. Correspondingly, the part where the top of the movable support 3 slides back and forth in front of the bottom of the chair base 1 is an inclined plane, which will not affect the function of the movable support 3.

The chair legs 2 include a chair leg frame 21 that extends around and is equipped with running wheels, a sleeve 22 that is vertically fixedly connected to the center of the chair leg frame 21, and a support shaft 23 that is inserted into the sleeve 22 and extends upward. The rear end of the support frame 11 is fixedly connected to the upper part of the support shaft 23. The mounting seat 33 is provided on the top of the support shaft 23, and the two are an integrated structure. A height adjustment device can be provided between the sleeve 22 and the support shaft 23 so that the height of the seat 1 can be adjusted.

Implementation case 2:

Referring to Figures 5-7, an office chair includes a chair base 1 and chair legs; the chair legs are connected to a support frame 11 that extends forward and tilts upward, and the front end of the support frame 11 has horizontal bars extending left and right. 12. The bottom surface of the front part of the chair seat 1 is provided with a sleeve structure that is rotatably sleeved on the cross bar 12. The above structure is the same as in Embodiment 1.

In this embodiment, a jacket structure 41 is connected to the rear end of the support frame 11. A vertically extending guide post 42 is slidably inserted into the jacket structure 41. The jacket structure 41 is provided with a manual driving mechanism to drive The guide post 42 slides up and down, and a flip support 43 is provided between the top of the guide post 42 and the seat 1. The middle or lower part of the flip support 43 is hinged to the top of the guide post 42, and its bottom end can be used as a rotation center to flip back and forth. , the top end of the flip support 43 is fixedly connected to the bottom surface of the chair base 1 .

The office users mentioned in Implementation Case 1 usually sit forward when working, especially those who work at the desk. Part of the center of gravity of their upper body is supported on the desk. For such users, if the chair base 1 The front end is slightly tilted upward, or the chair seat 1 as a whole is tilted downward from the front end to the rear end. When the user sits forward, the upper body tilts forward and the legs are lifted too upward. On the one hand, it is easy to cause the back It is more rickety, which may cause fatigue on the user's back and waist, and may even lead to pathological conditions of the spine and lumbar vertebrae. On the other hand, it exerts a heavy squeeze on the abdomen, which is extremely uncomfortable for fatter users. Therefore, under the premise that the office chair in this embodiment is suitable for office users to sit forward, the driving mechanism is used to drive the guide pillar 42 to slide up and down, so that the inclination of the chair base 1 can be adjusted to a more comfortable level with the sitting posture. , especially suitable for users who work at their desks.

The guide post 42 has a vertically extending rack 421, and the jacket structure 41 has a gap 422 that allows the rack 421 to pass up and down. The driving mechanism includes bearings 441 respectively provided on the left and right sides of the notch 422 of the jacket structure 41. A transverse rotating shaft 442 is connected between the two bearings 441. The rotating shaft 442 is fixedly sleeved with a gear rack 421 that meshes with the rack. Gear 443; one end of the rotating shaft 442 is provided with a rocker 444 or a knob cover. The rocker 444 selected in this embodiment can be rotated to raise and lower the guide post 42 to adjust the inclination of the seat 1.

The part of the guide post 42 with the rack 421 is fixedly connected to the multi-edge shell. The shape of the inner surface of the jacket structure 41 matches the multi-edge shell. The structure of the multi-edge shell makes the guide post 42 and The clamping structure 41 is more firmly embedded, which can avoid axial movement or slippage, making the adjustment of the guide post 42 more precise.

The flip support 43 includes two flip support plates 431 spaced left and right, a flip shaft 432 arranged laterally and fixedly connected to the middle of the two flip support plates 431 at both ends. The flip shaft 432 passes through the guide pillar 42 on the left and right sides. Two flip support plates 431 are clamped on the left and right sides of the guide post 42. The top ends of the two flip support plates 431 are fixedly connected to the bottom surface of the chair base 1. The flip support 43 is set by the flip support plates 431 and the flip shaft 432. The corresponding rotation when adjusting the inclination of the chair seat 1 prevents the guide pillar 42 from being stuck in the radial direction and preventing it from being raised or lowered, thereby improving the smoothness of the adjustment.

The left and right sides of the guide post 42 clamped by the two flip support plates 431 are vertical planes that are flat against the flip support plates 431, so that the flip support plates 431 increase the contact area with the guide posts 42, thereby making the The structural stability of the flip support 43 is better.

The bottom surface of the chair seat 1 is provided with two lugs 433 spaced left and right. The top ends of the two flip support plates 431 respectively fit on the two lugs 433 and are fixedly connected by at least two fasteners.

The lower parts of the two flipping support plates 431 each have an arc-shaped groove 434. The arc-shaped groove 434 has the connection point of the flipping shaft 432 on the flipping supporting plate 431 as the center of the circle. The guide post 42 has an adjusting rod 435 transversely penetrating. Both ends of the adjustment rod 435 pass through the two arc-shaped grooves 434 and are threadedly connected with locking nuts 436 that can clamp the two flip support plates 431. When the rocker 444 is turned to adjust the inclination of the chair seat 1, If the locking nut 436 is not tightened, due to the existence of mechanical clearance, the flip support 43 can flip back and forth in a small range. When the user adjusts the sitting posture in a small range, the chair base 1 can slightly rotate back and forth, which improves comfort; if it is tightened By locking the nut 436, the chair seat 1 is fixed and cannot rotate forward and backward, which improves the stability of the support for the user's buttocks and is more suitable for users with fixed sitting postures.

The thickness of the chair seat 1 gradually widens from the front end to the middle and rear portion, and then gradually decreases from the middle and rear portion to the rear end. The top end of the flip support 43 is fixedly connected to the middle and rear portion of the bottom surface of the chair seat 1 . between the top and the rear end, so the support force of the flip support 43 for the chair base 1 is tilted forward and upward, so that the support force points to the center of gravity of the user when he leans forward to sit, making the support better.

Implementation case 3:

Referring to Figures 8-13, an office chair includes a seat 1, a chair back 6, two armrests 5, and legs. The structures of the chair base 1 and the legs are the same as those in Implementation Cases 1 and 2. The structure between the chair base 1 and the legs can use the movable support of Implementation Case 1, or the guide post and flip support of Implementation Case 2.

In this embodiment, the surface of the end of the cross bar 12 has an oblique reciprocating spline pattern. The front end of the handrail 5 is rotated and sleeved on the end of the cross bar 12 and threadedly matched with it. The handrail 5 moves from the front to Then it is lifted upward to the top of the chair seat 1, and then bent sideways and wrapped around the back of the chair back 6. The rear end of the armrest 5 is movably connected to the rear surface of the chair back 6 and can slide laterally left and right along it. When the chair back 6 is moved by the armrest 5 The rear end of the chair seat 1 avoids the bottom end of the chair back 6 when it is tilted and turned around the crossbar 12, and the armrest 5 slides synchronously and laterally inward along the crossbar 12 when it is turned backward, so that the distance between the two armrests 5 is Zoom out.

When the user's back rests on the chair back 6, the armrest 5 and the chair back 6 tilt backward with the crossbar 12 as the axis of rotation. At this time, since the end of the crossbar 12 has a reciprocating spline pattern, the two armrests 5 slides laterally inward, so that the distance between the two armrests 5 is reduced, and then closer to both sides of the user's upper body. The arms supported on the armrests 5 also close inward, giving the user a sense of security during the process of leaning back. This makes it easier for users to relax and achieve the purpose and effect of relaxation.

The crossbar 12 is located on the left and right sides of the front end of the armrest 5 and is respectively fixedly connected with a limiting collar 12-1 that can abut the front end of the armrest 5 to limit the lateral sliding range of the armrest 5 along the crossbar 12 , the limiter collar 12-1 can limit the forward and backward tilting range of the chair back 6 to prevent the user from leaning too far back, thus causing potential safety hazards.

The crossbar 12 is covered with a first return compression spring 12-A. The two ends of the first return compression spring 12-A are respectively supported on the front end of the armrest 5 and the inner limit collar 12-1. The function of the spring 12-A is that when the user sits up from a reclined posture, the chair back 6 and the armrest 5 can be quickly reset, making the use more user-friendly.

The interior of the chair back 6 is provided with a circular channel 61 extending transversely to the left and right. The rear surface of the chair back 6 has two straight grooves 62 that are symmetrical and communicate with the circular channel 61. The straight grooves 62 are formed adjacent to the circular channel 61. One end of the side of the chair back 6 tilts upward to an end away from the side of the chair back 6. The rear ends of the two armrests 5 are provided with connecting rods 51 that extend forward and backward and are inserted into corresponding straight slots 62. The connecting rods 51 are located in a circle. A sliding rod 52 is fixedly connected to one end of the circular channel 61. The sliding rod 52 can slide left and right along the circular channel 61 and rotate around its axis relative to the circular channel 61. The chair back 6 is driven around by the armrest 5. When the crossbar 12 is tilted backwards, it is synchronously tilted around the sliding rod 52 so that the horizontal height of the bottom end of the chair back 6 is not lower than the rear end of the seat 1 .

When the user reclines, the chair back 6 turns backward around the crossbar 12, and the bottom end of the chair back 6 will inevitably be lower than the rear end of the chair seat 1, which will cause the user's waist and part of the back to feel hollow. , on the one hand, it will make the user feel insecure and difficult to completely relax, and the effect of relaxing and soothing the upper body will be greatly reduced; on the other hand, the lower half of the chair back 6 does not have enough support for the waist and part of the back. After a long time, In the supine and semi-lying position, the muscles of the waist and part of the back will feel uncomfortable, and may even cause pathological problems of the lumbar spine and spine such as lumbar disc herniation. In this embodiment, through the oblique straight groove 62, when the chair back 6 is flipped backward around the cross bar 12, it can be synchronously flipped back around the sliding rod 52 located in the circular channel 61, so that the chair back 6 can be flipped backward. The bottom end is flush with, or even slightly higher than, the rear end of the chair seat 1; thus the user's waist and part of the back are better supported and can achieve a relaxing effect. In addition, a lumbar cushion can also be provided between the rear end of the chair seat 1 and the bottom end of the chair back 6, so that the user can obtain a better experience.

The rear end of one armrest 5 has a guide rod 53 extending left and right. The guide rod 53 is slidably inserted into the rear end of the other armrest 5. The guide rod 53 is covered with a second return compression spring 5-B. Both ends of the return compression spring 5-B are supported on the rear ends of the two handrails 5 respectively. By arranging the guide rods 53, the rear ends of the two handrails 5 have better stability when moving laterally to the left and right, avoiding swaying or shaking. In addition, because the span between the front and rear ends of the handrails 5 is too large, only the first The rear end of the armrest 5 is easily stuck during reset due to the reset effect of the first reset compression spring 12-A. Therefore, the second reset compression spring 5-B can solve this problem, thereby making the reset movement of the armrest 5 smoother and smoother.

The second return compression spring 5-B is covered with a plastic bellows 54. The two ends of the plastic bellows 54 are respectively fixedly connected to the rear ends of the two armrests 5. The plastic bellows 54 serves to protect the internal third. Two return compression springs 5-B and guide rods 53 to avoid damage.

The armrest 5 includes a front armrest section 5-a, a middle armrest section 5-b, and a rear armrest section 5-c. The front armrest section 5-a extends basically vertically, and its front end is rotated and sleeved on the end of the crossbar 12. The rear end is lifted above the seat 1 and is integrally connected to the front end of the middle armrest section 5-b. The middle armrest section 5-b is tilted upward from the front end to the rear end and is used to support the arms. Its rear end is connected to the rear end of the armrest section 5-c. The front end of the armrest rear section 5-c is integrally connected to the connecting rod 51.

Implementation case 4:

Referring to Figures 14-16, an office chair includes a seat 1, a chair back 6, two armrests 5, and legs. The structures of the seat 1 and the legs are the same as those in Examples 1 and 2. The structure between the seat 11 and the legs can use the movable support of Example 1, or the guide post and flip support of Example 2.

The front end of the armrest 5 is rotated and sleeved on the end of the crossbar 12. The armrest 5 is lifted upward from front to back to the top of the chair seat 1, and then bent sideways and wrapped around the rear end of the armrest 5 and the chair behind the chair back 6. The rear surface of the back 6 is hinged; the back of the seat 1 is provided with a horizontal axis 71 extending from the left rear, and a swing arm 72 is provided between the end of the horizontal axis 71 and the side of the bottom end of the chair back 6. The front end of the arm 72 is fixedly connected to the end of the horizontal axis 71, and the rear end is hinged to the side of the bottom end of the chair back 6. The chair back 6 is driven by the armrest 5 around the cross bar 12 and rotates synchronously around the rear of the armrest 5 when tilted backward. The end of the chair seat 1 is flipped backward, and a rotation limiting mechanism is provided at the rear of the chair seat 1 to limit the rotation range of the horizontal axis 71 .

When the user's back rests on the chair back 6, the armrest 5 and the chair back 6 use the crossbar 12 as the axis of rotation when leaning backward. At this time, since the rear end of the armrest 5 is hinged with the rear surface of the chair back 6, The two ends of the swing arm 72 are respectively hinged with the horizontal axis 71 and the side of the bottom end of the chair back 6, so the chair back 6 synchronously flips backward around the rear end of the armrest 5, so that the seat 1 and the chair back 6 remain level. It prevents the user's waist and back from feeling hollow and improves comfort. In addition, the rotation range of the chair back 6 can be freely adjusted through the rotation limiting mechanism, that is, the maximum forward tilt angle and the maximum backward tilt angle of the chair back 6 can be customized, making it more user-friendly to use.

The rotation limiting mechanism includes an arc slide rail 81 fixed on the rear side of the chair seat 1 and two limiting structures that can slide along the arc slide rail 81 and lock the position. The arc slide rail 81 ends with the horizontal axis 71 As the center of the circle, the two limiting structures can abut against the swing arm 72 to limit its rotation range.

Specifically, the front and rear ends of the arc slide rail 81 are respectively fixedly connected with fixed plates 82 extending in the left and right directions, and an arc plate 83 spaced apart from the arc slide rail 81 is fixedly connected between the two fixed plates 82 . , the arc plate 83 is provided with an arc groove 84 along its extension direction. The limiting structure includes a sliding block 851 that is slidably embedded in the arc slide rail 81, and the inner end of the sliding block 851 is fixedly connected and the outer end passes through the arc. The groove 84 is a limiting rod 852 that can abut against the swing arm 72 , and a limiting knob 853 is threadedly sleeved on the outer end of the limiting rod 852 and can be pressed against the arc plate 83 to lock the position. When in use, first loosen the limit knob 853, and then slide the limit lever 852 along the arc slide rail 81 to adjust the position. After adjusting the position, tighten the limit knob 853 to press the arc plate 83 to the locked position, that is, The rotation range of the swing arm 72 can be limited.

An arc guide rod 86 is fixedly connected between the two fixed plates 82. The arc guide rod 86 is located between the arc slide rail 81 and the arc plate 83. The arc guide rods 86 all slide through the The limit rod 852 and the swing arm 72 can play a sliding guiding role for the limit rod 852 and the swing arm 72 by setting the arc guide rod 86, making the adjustment process and the rotation process of the swing arm 72 more stable and smooth.

The arc guide rod 86 is covered with a return compression spring 87. The two ends of the return compression spring 87 are respectively supported on the swing arm 72 and the fixed plate 82 at the rear end. The function of the return compression spring 87 is to when the user sits up, the chair Back 6 can be reset quickly.

A rubber pad 854 is provided at one end of the limit knob 853 close to the arc plate 83 to increase the friction force of the limit knob 853 pressing on the arc plate 83. On the one hand, the increased friction force locks the position of the limit structure. It is more solid and stable. On the other hand, it also avoids direct contact between the limit knob 853 and the arc plate 83, reducing damage to both and extending the service life.

In addition, the swing arm 72 is curved so as not to expose the top surface of the seat 1 and the front surface of the chair back 6 to avoid direct collision with the user's torso and avoid potential safety hazards.

Finally, it should be noted that the above implementation examples are only used to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing implementation examples, those of ordinary skill in the art should understand that it can still be used Modifications are made to the technical solutions recorded in the foregoing embodiments, or equivalent substitutions are made to some of the technical features; however, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions in each embodiment of the present invention.

Claims (5)

1. An adjustable office chair for desk office comprises a chair seat and chair legs; the chair is characterized in that the chair legs are connected with a supporting frame which extends forwards and inclines upwards, and the front end of the supporting frame is provided with a transverse rod which extends leftwards and rightwards; the bottom surface of the front part of the chair seat is provided with a sleeve structure which is rotationally sleeved on the cross rod; the rear end of the support frame is connected with a jacket structure, and the jacket structure is inserted with a guide post extending vertically in a sliding manner; the jacket structure is provided with a manual control driving mechanism to drive the guide post to slide up and down; a turnover support is arranged between the top end of the guide post and the chair seat, the middle part or the lower part of the turnover support is hinged to the top end of the guide post, the bottom end of the turnover support can be used as a rotation center to turn back and forth, and the top end of the turnover support is fixedly connected to the bottom surface of the chair seat; the guide post is provided with a rack extending vertically; the jacket structure is provided with a notch allowing the rack to pass through up and down; the driving mechanism comprises bearings respectively arranged at the left side and the right side of the clamping sleeve structure, which are positioned at the notch, a transverse rotating shaft is connected between the two bearings, and the rotating shaft is fixedly sleeved with a gear meshed with the rack; one end of the rotating shaft is provided with a rocker or a knob cover; the turnover support comprises two turnover support plates which are horizontally spaced, and turnover shafts which are transversely arranged and the two ends of which are respectively and fixedly connected with the middle parts of the two turnover support plates; the turning shaft transversely penetrates through the guide post left and right, and the two turning support plates are clamped on the left side and the right side of the guide post; the top ends of the two overturning support plates are fixedly connected to the bottom surface of the chair seat; the left side and the right side of the guide post clamped by the two overturning support plates are vertical planes which are flatly attached to the overturning support plates; the lower parts of the two turnover support plates are respectively provided with an arc-shaped groove, and the arc-shaped grooves take the connection point of the turnover shaft on the turnover support plate as the circle center; the guide post transversely penetrates through the adjusting rod, two ends of the adjusting rod penetrate through the two arc-shaped grooves and are connected with locking nuts capable of clamping the two overturning support plates in a threaded mode.

2. The adjustable office chair for use in a table-top office of claim 1, wherein the portion of the guide post having the rack is fixedly sleeved with a multi-edge housing; the shape of the inner surface of the jacket structure is matched with that of the multi-edge shell.

3. The adjustable office chair for the desk of claim 1, wherein the bottom surface of the chair seat is provided with two lugs spaced left and right, and the top ends of the two overturning support plates are respectively attached to the two lugs and fixedly connected through at least two fasteners.

4. The adjustable office chair for use in a table-top office of claim 1, wherein the thickness of the seat is gradually widened from the front end to the middle rear portion and gradually reduced from the middle rear portion to the rear end for gathering; the top end of the overturning support is fixedly connected between the middle rear part and the rear end of the bottom surface of the chair seat.

5. The adjustable office chair for the desk office according to claim 1, wherein the chair leg comprises a chair leg frame extending to the periphery and provided with travelling wheels, a sleeve vertically fixedly connected at the center of the chair leg frame, and a supporting shaft inserted in the sleeve and extending upwards; the rear end of the support frame is fixedly sleeved on the upper part of the support shaft.