CN113317648B

CN113317648B - Comfortable office chair capable of being loosened

Info

Publication number: CN113317648B
Application number: CN202110573230.7A
Authority: CN
Inventors: 沈海龙; 李小龙
Original assignee: Anji Hailong Furniture Co ltd
Current assignee: Anji Hailong Furniture Co ltd
Priority date: 2021-05-25
Filing date: 2021-05-25
Publication date: 2024-03-26
Anticipated expiration: 2041-05-25
Also published as: CN113317648A

Abstract

The utility model discloses a comfortable type office chair capable of being relaxed, which comprises a chair seat and chair legs; 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; a movable support is arranged between the chair legs and the chair seat, the bottom end of the movable support is hinged to the top end of the chair legs, the bottom end of the movable support can be used as a rotation center to turn back and forth, and the top end of the movable support is slidably connected to the bottom surface of the chair seat and can slide back and forth along the chair seat. The utility model has the beneficial effects that the chair is suitable for being used in front of an office desk, and the chair seat has the function of turning back and forth.

Description

Comfortable office chair capable of being loosened

Technical Field

The utility model relates to an office chair, in particular to a comfortable office chair which can be loosened.

Background

In the prior art, the comfort and the multifunction of office chairs, such as front tilting and back tilting, seat adjusting, back adjusting and the like, are increasingly demanded.

For example, prior art publication number CN109349844a discloses an office chair suitable for sedentary clan uses, including the office chair body, the equal fixed mounting in left and right sides of office chair body has the handrail, and the bottom fixed mounting of office chair body has the dead lever, and the one end fixed mounting that the office chair body bottom was kept away from to the dead lever has the supporting leg, and the middle part that the dead lever one end was kept away from to the supporting leg is equipped with the removal wheel, and the inboard of handrail just is located the top fixedly connected with holding rod of office chair body left and right sides. This office chair suitable for use of family of sitting for a long time carries out effective adjustment through the combination of slider and spout to the distance between backup plate and the seat of office chair body, makes the office chair body be applicable to different user's high demand, the effectual practicality that has improved equipment, carries out effectual fixedly to adjusting structure through the combination of fixing screw and spacing loop bar simultaneously, has further improved the stability in the equipment work.

For example, prior art publication number CN108402749a discloses an office chair with high stability, which comprises an office chair body, the ventilation foam-rubber cushion is installed to the inside intermediate position of office chair body, the button that contracts rises is installed to one side of office chair body front end, the internally mounted of one side of office chair body top has the bracing piece, fixed backplate is installed to the top of bracing piece, fixed back is installed to the rear end of office chair body top, high elasticity protection network is installed to the inside intermediate position of fixed back, automatic rolling groove is installed to the rear end of office chair body, the internally mounted in automatic rolling groove has the summer sleeping mat. The upper fixing frame and the lower fixing frame are arranged to be of symmetrical structures, the bottom of the office chair can be firmly supported through the upper fixing frame, so that the office chair body and the ground can be more firmly supported through the lower fixing frame, toppling is prevented, and the appearance can be more attractive, fashionable and personalized through symmetry.

For example, the prior art publication number CN210227506U discloses an office chair, which belongs to the field of office tables and comprises a main body support frame, a pallet, an armrest frame, an office chair backrest, a hydraulic support rod, a bottom support, a control rod and a roller assembly; the roller assembly comprises a roller frame, a rotating shaft and rollers; the rollers are arranged in a mode of large middle diameter and small diameters at two sides; the outer circumferential surface of the roller is provided with a uniform convex rib; the back of the office chair backrest is provided with an arc-shaped groove for installing the rotating shaft; the rotating shaft is embedded into the arc-shaped groove and is tightly pressed and fixed by the locking block, and the locking block is fixed on the back of the office chair backrest through a bolt. The office chair has good massage effect, well corrects sitting postures, and is more suitable for the spine, so that the office chair is comfortable and reliable to use; after the rotating shaft is embedded into the arc-shaped groove, the locking block is pressed and fixed, the locking block is fixed on the back surface of the office chair backrest through a bolt, the reliable installation of the roller assembly is ensured, the dismounting is convenient, the structural strength is good, the locking force is large, and the connection strength is reliable.

These office chairs have the following problems: firstly, the supporting position of the chair legs on the chair seat is positioned at the middle part of the chair seat, and the office chairs are used in office occasions, especially in front of office tables, most of users adopt forward leaning sitting postures when busy working, the gravity center of the upper body is relatively forward, the position of the upper body is spaced from the position of the chair legs on the chair seat, and the problems of structural damage, aging deformation and the like easily occur between the chair seat and the chair legs after long-time use. Secondly, the back of the chair is poor in backward function, the supporting force on the waist of a user is insufficient when the chair is backward, the muscle fatigue of the waist is easy to be caused, and even the lumbar disc bulge and other problems are easy to occur. Furthermore, the adjusting function of the chair seat is poor, and a corresponding reasonable adjusting mode is not set according to the office application environment.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a comfortable office chair which can be loosened, is suitable for being used in front of an office desk, and has a back-and-forth turning function.

The utility model is realized by the following technical scheme.

A relaxation comfortable office chair, which comprises a chair seat and chair legs; 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; a movable support is arranged between the chair legs and the chair seat, the bottom end of the movable support is hinged to the top end of the chair legs, the bottom end of the movable support can be used as a rotation center to turn back and forth, and the top end of the movable support is slidably connected to the bottom surface of the chair seat and can slide back and forth along the chair seat.

As a further improvement of the utility model, the movable support comprises a movable top plate and two left and right spaced movable support plates which are formed by vertically extending the bottom surface of the movable top plate; the top ends of the chair legs are provided with mounting seats, and each mounting seat is provided with a front seat head and a rear seat head which are spaced front and back; the mounting seat is internally provided with a cross pipe, the ends of the front section and the rear section of the cross pipe are respectively connected with the front seat head and the rear seat head, and the bottom ends of the two movable support plates are respectively sleeved on the left section and the right section of the cross pipe in a rotating way.

As a further improvement of the utility model, the top surface of the movable top plate is provided with a dovetail groove extending forwards and backwards; the bottom surface of the chair seat is fixedly connected with a mounting plate, and the bottom surface of the mounting plate is provided with a sliding rail which extends forwards and backwards and is matched with the dovetail groove in shape; the movable top plate is clamped and embedded on the sliding rail through the dovetail groove and can slide back and forth along the sliding rail.

As a further improvement of the utility model, the front end and the rear end of the sliding rail are respectively provided with a limiting block which can be abutted against the movable top plate so as to limit the front-back sliding range of the movable top plate.

As a further improvement of the utility model, the front section and the rear section of the cross pipe respectively penetrate through the front seat head and the rear seat head and can slide back and forth along the mounting seat; the front seat head and the rear seat head can abut against the crisscross part of the cross pipe to limit the front-back sliding range of the cross pipe.

As a further improvement of the utility model, the front section of the cross pipe is sleeved with a reset pressure spring, and the front end and the rear end of the cross pipe are respectively supported at the front seat head and the cross part; the elastic force of the reset pressure spring can enable the crisscross part and the rear seat head to abut against each other.

As a further improvement of the utility model, the root of the rear section of the cross pipe close to the cross part is fixedly sleeved with an elastic gasket; the elastic washer is supported between the crisscross portion and the rear seat head when the crisscross portion and the rear seat head are abutted against each other.

As a further improvement of the utility model, the thickness of the chair seat is gradually widened from the front end to the middle rear part, and then gradually reduced from the middle rear part to the rear end for gathering; the top end of the movable support is inclined plane at the sliding part of the bottom surface of the seat back and forth, and is inclined downwards from front to back.

As a further improvement of the utility model, the chair leg comprises a chair leg frame which extends to the periphery and is provided with travelling wheels, a sleeve vertically and fixedly connected to the center of the chair leg frame, and a supporting shaft which is inserted into the sleeve and extends upwards; the rear end of the supporting frame is fixedly sleeved on the upper part of the supporting shaft; the mounting seat is arranged at the top end of the supporting shaft, and the mounting seat and the supporting shaft are of an integrated structure.

The utility model has the beneficial effects that:

when the user needs to rest and relax, the sitting posture can be adjusted to lean backwards, the rest is used for holding most of the chair seat, at the moment, the gravity center is moved backwards, the upper body of the user can shake back and forth to enable the chair seat to turn back and forth, and the user is provided with a 'leisure' function.

Drawings

Preferred embodiments of the present utility model will be described in detail below with reference to the attached drawings, to facilitate understanding of the objects and advantages of the present utility model, wherein:

FIG. 1 is a right side view of an office chair of embodiment 1;

FIG. 2 is a front view of an office chair of embodiment 1;

FIG. 3 is an enlarged partial schematic view of FIG. 1;

FIG. 4 is a top view of a cross tube of embodiment 1;

FIG. 5 is a right side view of the office chair of embodiment 2;

FIG. 6 is an enlarged partial schematic view of FIG. 5;

FIG. 7 is a rear view of the guide post and flip mount of embodiment 2;

FIG. 8 is a right side view of the office chair of embodiment 3;

FIG. 9 is a front view of the support bracket and cross bar of embodiment 3;

FIG. 10 is a rear view of the armrest and seatback of embodiment 3;

fig. 11 is a rear view of the armrest of embodiment 3;

FIG. 12 is a rear view of the seatback of embodiment 3;

FIG. 13 is a cross-sectional view of the armrest and seatback of embodiment 3;

FIG. 14 is a right side view of the office chair of embodiment 4;

FIG. 15 is an enlarged partial schematic view of FIG. 14;

fig. 16 is a right side view of the rotation restricting mechanism of embodiment 4.

Detailed Description

The utility model is described in further detail below with reference to the drawings and the examples.

The terms of orientation such as up, down, left, right, front, rear, front, back, top, bottom, etc. mentioned or possible in this specification are defined with respect to the configurations shown in the drawings, and the terms "inner" and "outer" refer to the relative concepts of the terms toward or away from the geometric center of a particular component, respectively, and thus may be changed accordingly depending on the location and use state of the component. These and other directional terms should not be construed as limiting terms.

Embodiment case 1:

referring to fig. 1-4, an office chair comprises a seat 1 and legs 2; the chair leg 2 is connected with a supporting frame 11 which extends forwards and inclines upwards, and the rear end of the supporting frame 11 is fixedly connected with the chair leg 2 in a fixedly sleeved mode. The front end of the supporting frame 11 is provided with a transverse rod 12 extending left and right, and the bottom surface of the front part of the seat 1 is provided with a sleeve structure 13 which is rotatably sleeved on the transverse rod 12, so that the seat 1 can turn around the transverse rod 12 by taking the transverse rod 12 as a rotating shaft. A movable support 3 is arranged between the chair legs 2 and the chair seat 1, the bottom end of the movable support 3 is hinged to the top end of the chair legs 2, the bottom end of the movable support 3 can be used as a rotation center to turn back and forth, and the top end of the movable support 3 is slidably connected to the bottom surface of the chair seat 1 and can slide back and forth along the chair seat 1.

The office chair of this embodiment, the horizontal pole 12 that sets up in the anterior bottom surface of seat support 1 not only is regarded as the axis of rotation of back and forth upset, still regard as the support center of whole seat support 1, be fit for very much in the user who works before the desk, for example the user who works before the computer, the user who works on the table, usually sitting position is relatively forward, only the end is sat in the first half of seat support 1 for the whole focus of user is relatively forward so as to approximately coincide with the position of horizontal pole 12, can avoid because the focus of user and the back and forth interval of seat support 1 support central position, thereby lead to seat support 1 to be in the state of forward upset for a long time and then the problem that the structure is easily impaired, structural deformation etc. influences life.

When the user needs to rest and relax, the sitting posture can be adjusted to lean backwards, the rest center of gravity of the seat 1 is moved backwards, the upper body of the user can shake back and forth to enable the seat 1 to turn back and forth, and the user is provided with a 'leisure' function. The movable support between the chair legs 2 and the chair seat 1 plays a role in supporting the chair seat 1 and keeps good stability in the process of back and forth reciprocating reverse rotation, meanwhile, the bottom end of the movable support is hinged with the chair legs 2, the top end of the movable support is in sliding fit with the bottom surface of the chair seat 1, the chair seat 1 is smooth in the process of back and forth reciprocating reverse rotation, and the movable support cannot clamp the chair seat 1.

The movable support 3 comprises a movable top plate 31 and two left and right spaced movable support plates 32 formed by vertically extending the bottom surface of the movable top plate 31, the movable support plates 32 are approximately triangular in shape, and the front and back lengths of the movable top plate 31 are slightly larger than the top edges of the movable support plates 32, so that the contact area with the bottom surface of the seat 1 is increased, the sliding of the seat along the front and back directions is better supported, and the stability is improved. The top end of the chair leg 2 is provided with a mounting seat 33, and the mounting seat 33 is provided with a front seat head 331 and a rear seat head 332 which are spaced front and back; the cross tube 34 is arranged in the mounting seat 33, the ends of the front section 34-a and the rear section 34-b of the cross tube 34 are respectively connected with the front seat head 331 and the rear seat head 332, the bottom ends of the two movable support plates 32 are respectively sleeved on the left section 34-c and the right section 34-d of the cross tube 34 in a rotating way, the left section 34-c and the right section 34-d serve as left and right 'limbs' through the structural characteristics of the cross tube 34, the movable support 3 and the mounting seat 33 are hinged, and the front section 34-a and the rear section 34-b serve as front and rear 'limbs', so that the structural strength of the mounting seat 33 is enhanced.

The top surface of the movable top plate 31 is provided with a dovetail groove extending back and forth, the bottom surface of the seat 1 is fixedly connected with a mounting plate 35, the bottom surface of the mounting plate 35 is provided with a sliding rail 351 extending back and forth and matched with the shape of the dovetail groove, and the movable top plate 31 is clamped on the sliding rail 351 through the dovetail groove and can slide back and forth along the sliding rail 351. The mounting plate 35 and the movable top plate 31 are replaceable parts, and by arranging the mounting plate 35, the movable top plate 31 is prevented from being in direct contact with the base, so that the replacement is convenient when the movable top plate is damaged, and the replacement cost is low. The front end and the rear end of the sliding rail 351 are respectively provided with a limiting block 352 which can lean against the movable top plate 31 and is used for limiting the front-back sliding range of the movable top plate 31, so that the range of the front-back overturning range of the seat 1 is limited, and potential safety hazards are avoided.

The front and rear sections 34-a, 34-b of the cross tube 34 extend through the front and rear seat heads 331, 332, respectively, and are slidable back and forth along the mounting seat 33, and the front and rear seat heads 331, 332 can abut against the crisscross portion 34-e of the cross tube 34 to define the back and forth sliding range of the cross tube 34. The front section 34-a of the cross tube 34 is sleeved with a reset compression spring 36, the front end and the rear end of the reset compression spring are respectively supported on the front seat head 331 and the cross part 34-e, and the elastic force of the reset compression spring 36 can enable the cross part 34-e to abut against the rear seat head 332. On the premise that the limiting block 352 limits the preliminary range of the forward and backward turning range of the seat 1, the forward and backward sliding of the cross tube 34 can further amplify the forward and backward turning range of the seat 1 in a smaller range. For example, when the seat 1 is turned backwards, due to the action of the reset compression spring 36, the crisscross portion 34-e of the cross tube 34 is supported by the reset compression spring 36 to be abutted against the rear seat head 332, the movable top plate 31 slides forwards along the sliding rail 351 until being abutted against the limiting block 352 positioned at the front end, and then the cross tube 34 slides forwards to continue to turn backwards, in the process, the reset compression spring 36 is gradually compressed to gradually increase the damping of the backward turning of the seat 1 until stopping, so that the experience of a user can be improved, in the process of sliding the movable top plate 31 forwards and backwards along the sliding rail 351, the damping is very small to enable the turning of the seat 1 to be flexible, the seat is suitable for being loosened by the user, and when the backward turning is continued (the cross tube 34 is inserted to slide forwards), the reset spring plays a buffering role, and the safety is improved.

The root of the rear section 34-b of the cross tube 34, which is close to the cross portion 34-e, is fixedly sleeved with an elastic washer 37, the elastic washer 37 is supported between the cross portion 34-e and the rear seat head 332 when the cross portion 34-e and the rear seat head 332 are propped against each other, when the seat 1 is turned forwards under the action of the reset pressure spring 36, the cross tube 34 is reset to enable the cross portion 34-e and the rear seat head 332 to prop against each other, at the moment, the existence of the elastic washer 37 plays a buffering role, so that the user is prevented from feeling frustrated, and the comfort is improved.

The thickness of the chair seat 1 is gradually widened from the front end to the middle rear part, and then gradually reduced from the middle rear part to the rear end for gathering; the top end of the movable support 3 is inclined plane at the sliding part of the bottom surface of the seat 1, and is inclined downwards from front to back, when the user uses the cross bar 12 at the front part of the seat 1 as the rotation axis to relax the function of "ease", the impact force applied to the middle and rear part of the seat 1 is larger, so that the structural strength of the middle and rear part of the seat 1 needs to be enhanced, in this embodiment, by gradually increasing the thickness of the seat 1 from front to back, structures such as reinforcing ribs can be arranged in the middle and rear part of the seat 1 to strengthen the structural strength thereof, correspondingly, the sliding part of the top end of the movable support 3 at the bottom surface of the seat 1 is inclined plane, so that the function of the movable support 3 cannot be affected.

The chair leg 2 comprises a chair leg 21, a sleeve 22 and a supporting shaft 23, wherein the chair leg 21 extends to the periphery and is provided with travelling wheels, the sleeve 22 is vertically and fixedly connected to the center of the chair leg 21, the supporting shaft 23 is inserted into the sleeve 22 and extends upwards, the rear end of the supporting frame 11 is fixedly sleeved on the upper part of the supporting shaft 23, and the mounting seat 33 is arranged at the top end of the supporting shaft 23 and is of an integrated structure. A height adjustment device may be provided between the sleeve 22 and the support shaft 23 so that the height of the seat 1 may be adjusted.

Embodiment case 2:

referring to fig. 5-7, an office chair comprises a seat 1 and legs; the chair legs are connected with a supporting frame 11 which extends forwards and inclines upwards, the front end of the supporting frame 11 is provided with a transverse rod 12 which extends leftwards and rightwards, and the bottom surface of the front part of the chair seat 1 is provided with a sleeve structure which is sleeved on the transverse rod 12 in a rotating way, and the structure is the same as that of the embodiment 1.

In this embodiment, the rear end of the support frame 11 is connected with a jacket structure 41, the jacket structure 41 is slidably inserted with a vertically extending guide post 42, the jacket structure 41 is provided with a manual driving mechanism to drive the guide post 42 to slide up and down, a turnover support 43 is disposed between the top end of the guide post 42 and the seat 1, and the middle or lower part of the turnover support 43 is hinged to the top end of the guide post 42 and can turn back and forth with the bottom end as a rotation center, and the top end of the turnover support 43 is fixedly connected to the bottom surface of the seat 1.

The office user mentioned in embodiment 1 usually sits forward when working, especially a user who works on a table, a part of the center of gravity of the upper body of the user is supported on the office table, and for such a user, if the front end of the seat 1 is slightly tilted upward, or the seat 1 as a whole is tilted downward from the front end to the rear end, the user leans forward with the upper body in the sitting forward condition, and the legs are lifted excessively, on the one hand, the back is easy to get rickets, the back and waist of the user are easy to fatigue, even the pathological conditions of the spine and lumbar vertebrae are easy to occur, and on the other hand, the degree of compression of the abdomen is heavy, and the user is extremely uncomfortable. Therefore, on the premise that the office chair in the embodiment is suitable for office users with sitting postures being forward, the driving mechanism is used for driving the guide posts 42 to slide up and down, so that the inclination degree of the chair seat 1 can be adjusted, the chair seat can be matched with the sitting postures to achieve a more comfortable degree, and the office chair is particularly suitable for users working on a table.

The guide post 42 has a vertically extending rack 421, and the collet structure 41 has a notch 422 that allows the rack 421 to pass up and down. The driving mechanism comprises bearings 441 respectively arranged on the left and right sides of the jacket structure 41 at the notch 422, a transverse rotating shaft 442 is connected between the two bearings 441, and the rotating shaft 442 is fixedly sleeved with a gear 443 meshed with the rack 421; one end of the rotating shaft 442 is provided with a rocker 444 or a knob cover, and the rocker 444 is selected in this embodiment, and the guide post 42 can be lifted by rotating the rocker 444, so as to adjust the inclination degree of the seat 1.

The part of the guide pillar 42 with the rack 421 is fixedly sleeved with a multi-edge shell 422, the shape of the inner surface of the jacket structure 41 is matched with that of the multi-edge shell 422, the structure of the multi-edge shell 422 enables the clamping of the guide pillar 42 and the jacket structure 41 to be firmer, axial movement or slipping can be avoided, and the guide pillar 42 can be adjusted more accurately.

The turnover support 43 comprises two turnover support plates 431 with left and right intervals, and a turnover shaft 432 transversely arranged and fixedly connected to the middle parts of the two turnover support plates 431 respectively, the turnover shaft 432 transversely penetrates through the guide posts 42 left and right, the two turnover support plates 431 are clamped on the left side and the right side of the guide posts 42, the top ends of the two turnover support plates 431 are fixedly connected to the bottom surface of the seat 1, the turnover support 43 is arranged on the inclined degree of the seat 1 through the turnover support plates 431 and the turnover shaft 432 and rotates correspondingly when the inclined degree of the seat 1 is adjusted, so that the guide posts 42 are prevented from being blocked and cannot lift due to dislocation in the radial direction, and the smooth degree of adjustment is improved.

The left and right sides of the guide post 42 clamped by the two turnover support plates 431 are vertical planes flatly attached to the turnover support plates 431, so that the contact area between the turnover support plates 431 and the guide post 42 is increased, and the structural stability of the turnover support 43 is better.

The bottom surface of the seat 1 is provided with two lugs 433 spaced left and right, and the top ends of the two turnover support plates 431 are respectively attached to the two lugs 433 and are fixedly connected through at least two fasteners.

The lower parts of the two turnover support plates 431 are respectively provided with an arc groove 434, the arc grooves 434 take the connection point of the turnover shaft 432 on the turnover support plates 431 as the circle center, the guide posts 42 transversely penetrate through an adjusting rod 435, two ends of the adjusting rod 435 penetrate through the two arc grooves 434 and are respectively connected with a locking nut 436 in a threaded manner, when the tilting degree of the seat 1 is adjusted by rotating the rocker 444, if the locking nuts 436 are not screwed, the turnover support 43 can turn back and forth in a small range due to the existence of a mechanical gap, and the seat 1 can slightly rotate back and forth when a user adjusts sitting postures in a small range, so that the comfort is improved; if the lock nut 436 is tightened, the seat 1 is fixed against forward and backward rotation, improving the stability of the support for the buttocks of the user, which is more suitable for a user who fixes his sitting posture.

The thickness of the seat 1 is gradually widened from the front end to the middle rear part, and gradually reduced from the middle rear part to the rear end, and the top end of the overturning support 43 is fixedly connected between the middle rear part and the rear end of the bottom surface of the seat 1, so that the supporting force of the overturning support 43 on the seat 1 is inclined forwards and upwards, and the supporting force points to the gravity center of a user when leaning forwards in sitting posture, so that the supporting performance is better.

Embodiment 3:

referring to fig. 8-13, an office chair comprises a seat 1, a back 6, two armrests 5, and legs. The structure of the seat 1 and the legs is the same as that of the embodiments 1 and 2, and the structure between the seat 1 and the legs can be selected from the movable support of the embodiment 1, and can also be selected from the guide post and the turnover support of the embodiment 2.

In this embodiment, the surface of the end of the cross bar 12 has oblique reciprocating spline, the front end of the armrest 5 is rotatably sleeved at the end of the cross bar 12 and is in threaded fit with the end of the cross bar, the armrest 5 is lifted up to the upper side of the seat 1 from front to back, then is laterally bent and wound to the back of the chair back 6, the rear end of the armrest 5 and the rear surface of the chair back 6 are movably connected and can laterally slide left and right along the back, when the chair back 6 is driven by the armrest 5 to tilt backwards and overturned around the cross bar 12, the rear end of the chair seat 1 is avoided from the bottom end of the chair back 6, and the armrest 5 laterally and inwards synchronously slides along the cross bar 12 when the armrest 5 is overturned backwards, so that the distance between the two armrests 5 is reduced.

When the back of a user leans against the chair back 6, the armrests 5 and the chair back 6 are turned backwards by taking the cross rod 12 as a rotating shaft, at the moment, as the end part of the cross rod 12 is provided with reciprocating spline patterns, the two armrests 5 transversely inwards slide, so that the distance between the two armrests 5 is reduced, the two sides of the upper half body of the user are further attached, the arms supported on the armrests 5 are also inwards folded, the safety sense of the user in the backward turning process is given, the user can relax easily, and the relaxing purpose and effect are achieved.

The left side and the right side of the cross rod 12, which are positioned at the front end of the armrest 5, are respectively and fixedly sleeved with a limiting collar 12-1 which can be abutted against the front end of the armrest 5, so as to limit the transverse sliding range of the armrest 5 along the cross rod 12, and the range of the forward leaning and the backward leaning of the chair back 6 can be limited through the limiting collar 12-1, thereby avoiding potential safety hazards caused by excessive backward leaning of users.

The first reset pressure spring 12-A is sleeved outside the cross rod 12, two ends of the first reset pressure spring 12-A are respectively supported at the front end of the armrest 5 and the inwards limiting collar 12-1, and the first reset pressure spring 12-A has the function that when a user sits from a backward leaning posture, the chair back 6 and the armrest 5 can be quickly reset, so that the use is more humanized.

The inside of the chair back 6 is provided with a circular channel 61 which transversely extends left and right, the rear surface of the chair back 6 is provided with two straight grooves 62 which are bilaterally symmetrical and are communicated with the circular channel 61, the straight grooves 62 incline upwards from one end close to the side edge of the chair back 6 to one end far away from the side edge of the chair back 6, the rear ends of the two armrests 5 are provided with connecting rods 51 which extend forwards and backwards and are inserted into the corresponding straight grooves 62, one end of each connecting rod 51 positioned in the circular channel 61 is fixedly connected with a sliding rod 52, the sliding rod 52 can transversely slide left and right along the circular channel 61 and can rotate around the axis relative to the circular channel 61, and the chair back 6 is synchronously and backwards overturned around the sliding rod 52 when the armrests 5 drive the chair back 6 to turn backwards around the transverse rods 12, so that the horizontal height of the bottom end of the chair back 6 is not lower than the rear end of the chair seat 1.

In the backward tilting process of the user, the chair back 6 turns backwards around the cross rod 12, and the condition that the bottom end of the chair back 6 is lower than the rear end of the chair seat 1 is necessarily caused, so that the waist and part of the back of the user have a falling feel, on one hand, the user has no sense of safety, the user is not easy to thoroughly relax, and the effect of relaxing the upper half of the body is greatly reduced; on the other hand, the lower half of the seatback 6 has insufficient supporting force for the lumbar region and part of the back, and in a posture of leaning back and lying half for a long time, the muscles of the lumbar region and part of the back are uncomfortable, and even the lumbar region and the spine are easily pathologically affected, such as lumbar disc herniation. In the present embodiment, through the inclined straight groove 62, the chair back 6 can synchronously turn backwards around the sliding rod 52 in the circular channel 61 in the backward turning process around the cross rod 12, so that the bottom end of the chair back 6 is flush with the rear end of the chair seat 1, and even slightly higher than the rear end; therefore, the waist and part of the back of the user are better supported, and the relaxing effect can be achieved. In addition, a waist pad can be arranged between the rear end of the chair seat 1 and the bottom end of the chair back 6, so that a user can obtain better experience.

The rear end of one handrail 5 is provided with a guide rod 53 which extends leftwards and rightwards, the guide rod 53 is inserted into the rear end of the other handrail 5 in a sliding way, the guide rod 53 is sleeved with a second reset pressure spring 5-B in a sleeved mode, and two ends of the second reset pressure spring 5-B are respectively supported at the rear ends of the two handrails 5. By arranging the guide rod 53, the rear ends of the two armrests 5 are better in stability when moving transversely left and right, play or shake is avoided, in addition, due to the fact that the span between the front ends and the rear ends of the armrests 5 is overlarge, the rear ends of the armrests 5 are easy to clamp during resetting due to the resetting action of the first resetting pressure springs 12-A, and therefore the problem can be solved by arranging the second resetting pressure springs 5-B, and accordingly resetting movement of the armrests 5 is smoother.

The second reset pressure spring 5-B is sleeved with a plastic corrugated pipe 54, two ends of the plastic corrugated pipe 54 are fixedly connected with the rear ends of the two handrails 5 respectively, and the plastic corrugated pipe 54 protects the second reset pressure spring 5-B and the guide rod 53 inside and avoids damage.

The armrest 5 comprises an armrest front section 5-a, an armrest middle section 5-b and an armrest rear section 5-c, wherein the armrest front section 5-a basically extends vertically, the front end of the armrest front section is rotatably sleeved at the end part of the cross rod 12, the rear end of the armrest front section is lifted above the seat 1 and is integrally connected with the front end of the armrest middle section 5-b, the armrest middle section 5-b is upwards inclined from the front end to the rear end and is used for supporting an arm, the rear end of the armrest middle section is integrally connected with the front end of the armrest rear section 5-c, and the rear end of the armrest rear section 5-c is integrally connected with the connecting rod 51.

Embodiment 4:

referring to fig. 14-16, an office chair comprises a seat 1, a back 6, two armrests 5, and legs. The structure of the seat 1 and the legs is the same as that of the embodiments 1 and 2, and the structure between the seat 11 and the legs can be selected from the movable support of the embodiment 1, and can also be selected from the guide post and the turnover support of the embodiment 2.

The front end of the armrest 5 is rotatably sleeved at the end part of the cross rod 12, the armrest 5 is lifted up to the upper part of the seat 1 from front to back, and then is laterally bent and wound to the rear end of the armrest 5 behind the chair back 6 to be hinged with the rear surface of the chair back 6; the back of the chair 1 is provided with a left-rear extending transverse shaft 71, a swinging arm 72 is arranged between the end part of the transverse shaft 71 and the side edge of the bottom end of the chair back 6, the front end of the swinging arm 72 is fixedly connected with the end part of the transverse shaft 71, the rear end of the swinging arm is hinged to the side edge of the bottom end of the chair back 6, the chair back 6 is synchronously turned backwards around the rear end of the armrest 5 when being turned backwards around the transverse rod 12 by the armrest 5, and the back of the chair 1 is provided with a rotation limiting mechanism for limiting the rotation range of the transverse shaft 71.

When the back of a user leans against the chair back 6, the armrest 5 and the chair back 6 are turned backwards by taking the cross rod 12 as a rotation shaft, at the moment, the rear end of the armrest 5 is hinged with the rear surface of the chair back 6, and the two ends of the swinging arm 72 are respectively hinged with the lateral sides of the bottom ends of the cross shaft 71 and the chair back 6, so that the chair back 6 synchronously turns backwards around the rear end of the armrest 5, the chair seat 1 and the chair back 6 are kept flush, the waist and the back of the user cannot feel empty, and the comfort is improved. In addition, the rotation range of the chair back 6 can be freely adjusted through the rotation limiting mechanism, namely, the maximum forward tilting angle and the maximum backward elevation angle of the chair back 6 can be customized, and the chair back is more humanized to use.

The rotation limiting mechanism comprises an arc sliding rail 81 fixed on the side surface of the rear part of the seat 1 and two limiting structures capable of sliding along the arc sliding rail 81 and locking positions, wherein the arc sliding rail 81 takes the end part of the transverse shaft 71 as the circle center, and the two limiting structures can abut against the swing arm 72 to limit the rotation range of the swing arm.

Specifically, the front end and the rear end of the arc sliding rail 81 are respectively fixedly connected with a fixing plate 82 extending along the left-right direction, an arc plate 83 spaced from the arc sliding rail 81 is fixedly connected between the two fixing plates 82, an arc groove 84 is formed in the arc plate 83 along the extending direction of the arc plate 83, the limiting structure comprises a sliding block 851 which is clamped on the arc sliding rail 81 in a sliding manner, the outer end of the inner end of the limiting structure is fixedly connected with the sliding block 851, the outer end of the limiting rod 852 is penetrated through the arc groove 84 and can abut against the swing arm 72, and a limiting knob 853 is sleeved at the outer end of the limiting rod 852 in a threaded manner and can be tightly pressed on the arc plate 83 to be locked. When the swing arm 72 is used, the limit knob 853 is loosened, then the limit rod 852 is slid along the arc sliding rail 81 to adjust the position, and after the position is adjusted, the limit knob 853 is screwed tightly, so that the limit knob is tightly pressed against the locking position of the arc plate 83, and the rotation range of the swing arm 72 can be limited.

The two fixed plates 82 are fixedly connected with the arc guide rods 86, the arc guide rods 86 are located between the arc sliding rails 81 and the arc plates 83, the arc guide rods 86 are all penetrated through the limiting rods 852 and the swinging arms 72 in a sliding mode, and the sliding guide effect on the limiting rods 852 and the swinging arms 72 can be achieved through the arrangement of the arc guide rods 86, so that the adjusting process and the swinging arms 72 are stable and smooth in the rotating process.

The circular arc guide rod 86 is sleeved with a reset pressure spring 87, two ends of the reset pressure spring 87 are respectively supported on the swing arm 72 and the fixing plate 82 positioned at the rear end, and the reset pressure spring 87 has the function of quickly resetting the chair back 6 when a user sits.

The one end that spacing knob 853 is close to circular arc 83 is provided with rubber pad 854 to increase the frictional force that spacing knob 853 pressed on circular arc 83, on the one hand the frictional force of increase makes limit structure's position locking more firm stable, on the other hand also avoids spacing knob 853 and circular arc 83 direct contact, reduces both damage in order to increase life.

In addition, the swing arm 72 is bent so as not to expose the top surface of the seat 1 and the front surface of the back 6, so as to avoid direct collision with the trunk of the user and avoid potential safety hazard.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme recorded in each embodiment can be modified or part of technical features in the technical scheme can be replaced equivalently; such modifications and substitutions do not depart from the spirit of the utility model.

Claims

1. A relaxation comfortable office chair, which 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; a movable support is arranged between the chair legs and the chair seat, the bottom end of the movable support is hinged to the top end of the chair legs and can be turned back and forth by taking the bottom end as a rotation center, and the top end of the movable support is connected to the bottom surface of the chair seat in a sliding manner and can slide back and forth along the chair seat; the movable support comprises a movable top plate and two left and right spaced movable support plates formed by vertically extending the bottom surface of the movable top plate; the top ends of the chair legs are provided with mounting seats, and each mounting seat is provided with a front seat head and a rear seat head which are spaced front and back; the mounting seat is internally provided with a cross pipe, the ends of the front section and the rear section of the cross pipe are respectively connected with the front seat head and the rear seat head, and the bottom ends of the two movable support plates are respectively sleeved on the left section and the right section of the cross pipe in a rotating way; the front section and the rear section of the cross pipe respectively penetrate through the front seat head and the rear seat head and can slide back and forth along the mounting seat; the front seat head, the rear seat head and the crisscross part of the cross pipe are abutted against each other to limit the front-back sliding range of the cross pipe; the front section of the cross pipe is sleeved with a reset pressure spring, and the front end and the rear end of the reset pressure spring are respectively supported at the front seat head and the cross part; the elastic force of the reset pressure spring can enable the crisscross part and the rear seat head to abut against each other.

2. The relaxed comfortable office chair of claim 1, wherein the top surface of the movable top panel has a dovetail slot extending back and forth; the bottom surface of the chair seat is fixedly connected with a mounting plate, and the bottom surface of the mounting plate is provided with a sliding rail which extends forwards and backwards and is matched with the dovetail groove in shape; the movable top plate is clamped and embedded on the sliding rail through the dovetail groove and can slide back and forth along the sliding rail.

3. The comfortable and relaxed office chair of claim 2, wherein the front and rear ends of the slide rail each have a stopper that can abut against the movable top plate to limit the forward and rearward sliding range of the movable top plate.

4. The comfortable and relaxed office chair of claim 1, wherein the rear section of the cross tube is fixedly sleeved with an elastic washer near the root of the cross; the elastic washer is supported between the crisscross portion and the rear seat head when the crisscross portion and the rear seat head are abutted against each other.

5. The comfortable, relaxed office chair of claim 1 wherein the thickness of the seat gradually widens from the front end to the middle rear portion and gradually decreases from the middle rear portion back to the rear end for gathering; the top end of the movable support is inclined plane at the sliding part of the bottom surface of the seat back and forth, and is inclined downwards from front to back.

6. The comfortable type office chair of claim 1, wherein the chair leg comprises a chair leg frame extending to the periphery and provided with walking wheels, a sleeve vertically fixedly connected to the center of the chair leg frame, and a supporting shaft inserted into the sleeve and extending upwards; the rear end of the supporting frame is fixedly sleeved on the upper part of the supporting shaft; the mounting seat is arranged at the top end of the supporting shaft, and the mounting seat and the supporting shaft are of an integrated structure.