CN109846244B

CN109846244B - Multifunctional office chair

Info

Publication number: CN109846244B
Application number: CN201910230156.1A
Authority: CN
Inventors: 肖增荣
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-03-23
Filing date: 2019-03-23
Publication date: 2022-04-22
Anticipated expiration: 2039-03-23
Also published as: CN109846244A

Abstract

The invention relates to the technical field of seat armrests, in particular to a multifunctional office chair which comprises a seat keel, an adjustable seat frame and a chair back, wherein the seat keel is in a herringbone shape, the foot part of the seat keel extends downwards to form a keel frame seat, the chair back comprises a backrest and an arched backrest which are separately arranged, the backrest can slide along the ridge direction of the seat keel, the bottom of the adjustable seat frame is provided with a bearing chassis, and the keel frame seat is screwed on one side of the bearing chassis; adjustable handrail is installed to fossil fragments frame seat both sides, and adjustable handrail includes handrail portion, rotating part and lift portion, and handrail portion inlay card is in the one end of rotating part, and the other end of rotating part is equipped with female end interface, and the one end embedding of lift portion is in fossil fragments frame seat, and the other end of lift portion is equipped with the public end interface of perpendicular to lift portion, and the rotating part passes through female end interface and public end interface cooperation with lift portion and is connected. The invention has various flexible and adjustable structures, can meet the use requirements under various conditions, and can be comfortably used by users with different body types.

Description

Multifunctional office chair

Technical Field

The invention relates to the technical field of chair armrests, in particular to a multifunctional office chair.

Background

The office chair is an indispensable article in daily work and study of people, and for the personnel of working for a long time, the office chair not only needs to bring comfort in work, also can give other people the comfort when having a rest, therefore need more when designing the various user demands and the use custom of considering the user. There are two defects in current office chair: (1) the design of existing office chairs rarely takes into account the user's needs in different situations, for example, when the user is working, the user may need to have the armrest fit the elbow more closely, and the backrest can be adjusted to a comfortable angle when resting. (2) The design of current office chair does not consider user's figure and size difference, and the great user of size often can not sit on office chair comfortably, probably takes place dangerous condition even when leaning on the back rest, and the high user of size often produces the uncomfortable condition of back and waist.

Disclosure of Invention

The invention aims to overcome the defects that the existing office chair cannot meet most use requirements and use habits of users and cannot be suitable for users with various body types.

In order to achieve the purpose, the invention discloses a multifunctional office chair which comprises a seat keel, an adjustable seat frame and a chair back, wherein the seat keel is in a herringbone shape, the feet of the seat keel extend downwards and are connected with each other to form a keel frame seat for mounting the adjustable seat frame, the chair back comprises a backrest and an arched backrest which are separately arranged, the backrest and the arched backrest are mounted on the seat keel, the backrest can slide along the ridge direction of the seat keel, the bottom of the adjustable seat frame is provided with a bearing chassis, and the keel frame seat extends to form a pair of buckling arms which are screwed on one side of the bearing chassis; adjustable handrail is installed respectively with handing-over department of fossil fragments foot of seat, and adjustable handrail includes handrail portion, rotating part and lift portion, and handrail portion inlay card is in the one end of rotating part, and the other end of rotating part is equipped with the female end interface, and the one end embedding of lift portion is in fossil fragments frame seat, and the other end of lift portion is equipped with the public end interface of perpendicular to lift portion, and the rotating part passes through female end interface and public end interface cooperation with lift portion and is connected.

Preferably, the female end interface is provided with an upper clamping arm and a lower clamping arm, a connecting cavity is formed between the upper clamping arm and the lower clamping arm, the middle of the male end interface is provided with a fulcrum arm which is adaptive to the connecting cavity, the upper side and the lower side of the fulcrum arm are respectively provided with a clamping arm cavity, the outer sides of the upper clamping arm, the lower clamping arm and the fulcrum arm are in a convex arc shape, and the inner side surfaces of the connecting cavity and the clamping arm cavity are in a concave arc shape.

Further, fossil fragments frame foundation inboard is equipped with vertical lift rail, vertical lift rail comprises the multiunit syntropy range, the lifting tooth is installed to the bottom of lift portion, the lifting tooth is formed with the hook groove that is used for the joint spacer and the bullet hook groove that the adaptation is in pressing the bullet hook, bullet hook groove and hook groove are located the lifting tooth opposite side respectively, the lifting tooth is connected with and pushes away the torsional spring to vertical lift rail direction with the hook groove, the one end and the lifting tooth of torsional spring are connected, the other end and the one side in lift hole of torsional spring are connected.

Further, the bottom of handrail portion is opened there is the sliding tray, and the rotating part is equipped with the rotatory arch of adaptation in the sliding tray, and handrail portion movable mounting is equipped with the activity stopper that is used for restricting handrail portion sliding range in the handrail portion on rotatory arch, and the activity stopper is fixed on rotatory arch, leaves the free space between the both ends of activity stopper and the inner chamber of handrail portion, and handrail portion top cover is equipped with soft handrail.

Preferably, the backrest is in a ladder shape with a narrow top and a wide bottom, a concave surface back to the seat keel is formed on the backrest along the vertical direction, and the top end of the backrest is bent outwards to form a V-shaped neck guard portion.

Preferably, the backrest is slidably arranged on the upper edge of the seat keel, a lifting clamping groove which is longitudinally arranged and a positioning loop which is composed of a plurality of annular holes are formed in the inner side of the seat keel, a positioning rod is fixed on the inner side of the backrest, a plurality of groups of helical teeth are arranged on one side of the lifting clamping groove, a limiting jacking block is arranged at the top of the lifting clamping groove, one end of the positioning rod is in a hook shape corresponding to the annular holes, and a clamping rod which is used for being clamped on the helical teeth is fixed on the backrest.

Preferably, a chair back angle adjusting mechanism, a lifting pneumatic cylinder and a sliding groove are arranged in the bearing chassis, the buckling arm extends into the bearing chassis and is connected with the bearing chassis in a rotating mode, the chair back angle adjusting mechanism is connected with the buckling arm through a lead respectively, the lifting pneumatic cylinder is externally connected with a pneumatic rod and a pneumatic adjusting plate used for adjusting the pneumatic rod, a five-star foot base is sleeved at the bottom end of the pneumatic rod, the strip-shaped sliding groove is located on one side of the bearing chassis, multiple sets of teeth are formed on one side of the strip-shaped sliding groove, and positioning blocks are arranged in the direction of the teeth.

Furthermore, the bottom of the adjustable seat frame is provided with a control rod for adjusting the height of the adjustable seat frame, the front and rear positions of the adjustable seat frame and the angle of the seat back, one end of the control rod is connected with a spherical connector, two sides of the spherical connector are respectively provided with a first wire clamping groove and a second wire clamping groove, the end part of the spherical connector is provided with a third wire clamping groove, the first wire clamping groove is connected with a first wire for pulling the seat back angle adjusting mechanism, the second wire clamping groove is connected with a second wire for positioning blocks, and the third wire clamping groove is connected with a third wire for pulling the air pressure adjusting plate.

Preferably, the adjustable seat frame comprises a left seat frame, a right seat frame, a front seat frame and a rear seat frame which are in arc shapes, wherein the left seat frame and the right seat frame are upwards protruded, the left seat frame and the right seat frame form an inclination angle towards the inner side and the lower side respectively, the front seat frame and the rear seat frame are downwards sunken, and the arc length and the arc degree of the front seat frame are both larger than those of the rear seat frame.

Preferably, the backrest, the arched backrest and the adjustable seat frame are of hollow frame-shaped structures, and thin cloth is paved on the backrest, the arched backrest and the adjustable seat frame.

The invention has the beneficial effects that: the adjustable chair has various flexible and adjustable structures, comprises a backrest with adjustable height, an adjustable seat frame with adjustable horizontal distance and height and an adjustable armrest structure capable of rotating in a large range, can meet the use requirements under various conditions, and can be comfortably used by users with different body types.

Drawings

FIG. 1: the structure schematic diagram of the multifunctional office chair.

FIG. 2: explosion diagram of the seat keel and backrest sliding connection.

FIG. 3: the structure schematic diagram of the lifting clamping groove and the positioning loop.

FIG. 4: the structure of the adjustable hand guard is schematically shown.

FIG. 5: the maximum rotation range schematic diagram of the adjustable hand guard.

FIG. 6: explosion schematic of an adjustable handrail.

FIG. 7: and the male end interface and the female end interface are connected schematically.

FIG. 8: the structure of the longitudinal lifting rail is schematically shown.

FIG. 9: the structure of the lifting tooth is shown schematically.

FIG. 10: the structure of the adjustable seat frame is schematically shown.

FIG. 11: the internal structure of the load-bearing chassis is schematically shown.

FIG. 12: the structure schematic diagram of the lifting pneumatic cylinder and the pneumatic adjusting plate.

FIG. 13: explosion diagram of the control rod.

FIG. 14: the connection of seat keel and load-bearing chassis.

FIG. 15: a schematic connection diagram of a chair back angle adjusting mechanism.

FIG. 16: the multifunctional office chair has a rest and relaxation use state.

FIG. 17: the multifunctional office chair is in a working and using state schematic diagram.

FIG. 18: the status of the multifunctional office chair is schematically shown for a larger user.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the present invention will be further described with reference to the embodiments and the accompanying drawings.

The invention discloses a multifunctional office chair.

Referring to fig. 1-15, a preferred embodiment of the present invention includes a seat frame 1, an adjustable seat frame 2 and a seat back, wherein the seat frame 1 is "herringbone", the feet of the seat frame 1 extend downward and are connected to each other to form a frame seat 3 for mounting the adjustable seat frame 2, the seat back includes a backrest 4 and an arched backrest 5 which are separately arranged, the arched backrest 5 protrudes toward the inner side of the seat to provide a larger contact area for the waist, the backrest 4 and the arched backrest 5 are mounted on the seat frame 1, the backrest 4 can slide along the ridge direction of the seat frame 1, a load-bearing chassis 6 is disposed at the bottom of the adjustable seat frame 2, and a pair of buckling arms 30 which are screwed to one side of the load-bearing chassis 6 extend from the frame seat frame 3; adjustable handrail 7 is installed respectively to the foot of seat fossil fragments 1 and the handing-over department of fossil fragments frame foundation 3, adjustable handrail 7 includes handrail portion 71, rotating part 72 and lift portion 73, handrail portion 71 inlay card is in the one end of rotating part 72, the other end of rotating part 72 is equipped with female end interface 74, the one end embedding of lift portion 73 is in fossil fragments frame foundation 3, the other end of lift portion 73 is equipped with the public end interface 75 of perpendicular to lift portion 73, rotating part 72 is connected through female end interface 74 and the cooperation of public end interface 75 with lift portion 73.

In an alternative solution, in order to increase the rotation angle of the adjustable armrest 7, the male connector 75 and the female connector 74 are screwed together; specifically, the female port 74 is provided with an upper clamping arm 741 and a lower clamping arm 742, a connection cavity 743 is formed between the upper clamping arm 741 and the lower clamping arm 742, the middle of the male port 75 is provided with a fulcrum arm 751 adapted to the connection cavity 743, the upper side and the lower side of the fulcrum arm 751 are respectively provided with a clamping arm cavity 752, the upper clamping arm 741 and the lower clamping arm 742 are respectively attached to the clamping arm cavity 752, the fulcrum arm 751 is attached to the connection cavity 743, the outer sides of the upper clamping arm 741, the lower clamping arm 742 and the fulcrum arm 751 are in a convex arc shape, the inner side surfaces of the connection cavity 743 and the clamping arm cavity 752 are in a concave arc shape, the upper clamping arm 741, the lower clamping arm 742 and the fulcrum arm 751 are rotatably connected through the connection assembly, and the armrest portion 71 and the lift portion 73 can relatively rotate by about 120 °.

On the basis of the above embodiment, in order to adapt to the arm lengths of different people, the adjustable armrest 7 has a lifting function; specifically, the inside of keel frame seat 3 is equipped with vertical lift rail 31, vertical lift rail 31 comprises multiunit spacer 32 syntropy range, lift tooth 76 and pressing elastic hook 77 are installed to the bottom of lift portion 73, lift tooth 76 is formed with the hookup groove 761 that is used for joint spacer 32 and is adapted to press elastic hook groove 762 of elastic hook 77, elastic hook groove 762 and hookup groove 761 are located lift tooth 76 opposite side respectively, lift tooth 76 is connected with pushes away the hookup groove 761 to the torsional spring 33 of vertical lift rail 31 direction, the one end and the lift tooth 76 of torsional spring 33 are connected, the other end and the one side of lift portion 31 of torsional spring 33 are connected. When the height of the adjustable armrest 7 needs to be adjusted, the adjustable armrest 7 is lifted upwards to a certain height, the hooking groove 761 of the lifting tooth 76 is hooked on the positioning plate 32, and the adjustable armrest 7 is fixed at the height; when the adjustable armrest 7 needs to be lowered, an external force is applied to the outside of the adjustable armrest 7, and the elastic hook 77 is pressed to hook the elastic hook groove 762, so that the hook groove 761 is separated from the positioning piece 32, and then the height of the adjustable armrest 7 is directly lowered.

On the basis of the above embodiment, the adjustable armrest 7 can further improve the rotation angle at a rotation angle of 120 °, the bottom of the armrest part 71 is provided with a sliding groove 711, the rotating part 72 is provided with a rotating protrusion 721 adapted to the sliding groove 711, the armrest part 71 is movably mounted on the rotating protrusion 721, the armrest part 71 is internally provided with a movable limit block 712 for limiting the sliding range of the armrest part 71, the movable limit block 712 is fixed on the rotating protrusion 721, a moving space is left between two ends of the movable limit block 712 and the inner cavity of the armrest part 71, and the soft armrest 713 is sleeved above the armrest part 71. Under the action of the movable limiting block 712, the armrest part 71 can translate and rotate back and forth relative to the rotating part 72, the maximum rotating angle range of the armrest part 71 is 60 degrees, and the maximum rotating angle range of the adjustable armrest 7 is 180 degrees under the action of the armrest part 71 and the lifting part 73.

In an optional technical scheme, the backrest 4 is in a ladder shape with a narrow upper part and a wide lower part, the backrest 4 forms a concave surface back to the seat keel 1 along the vertical direction and is suitable for the back of a human body, the top end of the backrest 4 is bent outwards to form a V-shaped neck protection part 41, an included angle of about 30 degrees is formed between the V-shaped neck protection part 41 and the backrest 4, and the function of supporting the neck is achieved.

In an optional technical scheme, solving the problem that the height of a user is different, the backrest 4 is arranged on the upper edge of the seat keel 1 in a sliding manner, and the backrest 4 can slide along the seat keel 1. Specifically, the inside of seat fossil fragments 1 is equipped with the lift draw-in groove 13 of vertical setting and the location ring way 14 of constituteing by a plurality of annulars 15, and 4 inboard sides of back are fixed with locating lever 42, and one side of lift draw-in groove 13 is equipped with a plurality of groups skewed tooth 131, and lift draw-in groove 13 top is equipped with spacing kicking block 132, and locating lever 42 one end is the hook-shaped of hanging that corresponds to annulars 15, and 4 parts of back are fixed and are used for the joint pole 43 of card on skewed tooth 131. In this embodiment, the lifting slot 13 is provided with three sets of helical teeth 131, a screw is used as the clamping rod 43, the bottom end of the positioning rod 42 is fixed on the backrest 4, the top end of the positioning rod 42 is hooked on the annular hole 15, the screw used as the clamping rod 43 is fixed on one side of the positioning rod 42, the screw head is clamped in a tooth cavity formed by one of the helical teeth 131, when the height of the backrest 4 needs to be adjusted, the backrest 4 is pushed, the clamping rod 43 is fixed in a higher or lower tooth cavity, the hooking of the upper end of the positioning rod 42 in the annular hole 15 is confirmed, the clamping rod 43 does not exceed the limit top block 132 at most, and the maximum adjusting range of the backrest 4 is 50 mm.

In an optional technical scheme, a chair back angle adjusting mechanism 61, a lifting pneumatic cylinder 62 and a sliding groove 63 are arranged in the bearing chassis 6, the fastening arm 30 extends into the bearing chassis 6 and is connected with the bearing chassis 6 in a rotating mode, the chair back angle adjusting mechanism 61 is connected with the fastening arm 30 through a lead respectively, the lifting pneumatic cylinder 62 is externally connected with a pneumatic rod 621 and a pneumatic adjusting plate 622 used for adjusting the pneumatic rod 621, a five-star foot base 623 is sleeved at the bottom end of the pneumatic rod 621, the bar-shaped sliding groove 63 is located on one side of the bearing chassis 6, multiple sets of teeth 631 are formed on one side of the bar-shaped sliding groove 63, and a positioning block 632 is arranged on the direction of the teeth 631. In the embodiment, the angle of the seat back is adjusted by adjusting the seat back angle adjusting mechanism 61 and pulling the buckling arm 30, the height of the adjustable seat frame 2 is adjusted by adjusting the air pressure adjusting plate 622 on the lifting pneumatic cylinder 62, and the front and back positions of the adjustable seat frame 2 are adjusted by adjusting the position of the positioning block 632 on the strip-shaped sliding groove 63. Specifically, the bottom of the adjustable seat frame 2 is provided with a control rod 8 for adjusting the height of the adjustable seat frame 2, the front and rear positions of the adjustable seat frame 2 and the angle of the seat back, one end of the control rod 8 is connected with a spherical connector 81, two sides of the spherical connector 81 are respectively provided with a first wire clamping groove 82 and a second wire clamping groove 83, the end of the spherical connector 81 is provided with a third wire clamping groove 84, wherein the first wire clamping groove 82 is connected with a first wire 821 for pulling a nut 611 of the seat back, the second wire clamping groove 83 is connected with a second wire 831 for a positioning block 632, and the third wire clamping groove 84 is connected with a third wire 841 for pulling an air pressure adjusting plate 622. When the chair back angle needs to be adjusted, as shown in fig. 15, the chair keel 1 is screwed on the load-bearing chassis 6, one side of the chair back angle adjusting mechanism 61 is respectively wound on the buckling arm 30 through a wire (the wire between the chair back angle adjusting mechanism 61 and the buckling arm 30 is omitted in fig. 15), the other side of the chair back angle adjusting mechanism 61 is controlled by the control rod 8 through the wire in a pulling manner, the control rod 8 is pulled to the right side, the first wire 821 pulls the chair back angle adjusting mechanism 61, and therefore the relative position of the buckling arm 30 and the load-bearing chassis 6 is adjusted; when the adjustable seat frame 2 needs to be adjusted, as shown in fig. 11, the control rod 8 is pulled to the left, the second wire 831 is tightened to pull the positioning block 632 to leave the strip-shaped sliding groove 63, and then the front-back relative distance between the adjustable seat frame 2 and the load-bearing chassis 6 is adjusted; when the height of the adjustable seat frame 2 needs to be adjusted, as shown in fig. 12, the control rod 8 is pulled to the lower side, the third lead 841 is tightened, the air pressure adjusting plate 622 is pulled, and the height of the adjustable seat frame 2 is adjusted.

In an alternative solution, in order to adapt to a user with a large size, the adjustable seat frame 2 is designed to have an arc-shaped structure on four sides, specifically, the adjustable seat frame 2 includes a left seat frame 21, a right seat frame 22, a front seat frame 23 and a rear seat frame 24, which are in an arc shape, wherein the left seat frame 21 and the right seat frame 22 are upwardly convex, the left seat frame 21 and the right seat frame 22 are both inwardly and downwardly inclined, the front seat frame 23 and the rear seat frame 24 are downwardly concave, and both the arc length and the arc degree of the front seat frame 23 are greater than those of the rear seat frame 24. The left and right sides and the middle of the adjustable seat frame 2 of the embodiment have larger height difference, the front and back sides have the lowest height, a user with a larger body size can use the seat frame comfortably, and the front seat frame 23 is sunken downwards, so that the feeling of propping the thighs cannot be generated.

In an optional technical scheme, the backrest 4, the arched backrest waist 5 and the adjustable seat frame 2 are of hollow frame-shaped structures, and thin cloth velvet is paved on the backrest 4, the arched backrest waist 5 and the adjustable seat frame 2, so that the chair has the characteristic of fast heat dissipation, and is not easy to generate stuffy feeling when people sit for a long time in high-temperature weather.

The multifunctional office chair provided by the invention has the characteristics of being suitable for different use requirements of users and being suitable for users with different body types. Specifically, as shown in fig. 16 to 18, in order to solve the problem of different use requirements of users, the use requirements of most users include work (for example, work before a computer), rest (for example, lying down for a rest), and relaxation and entertainment (for example, playing a mobile phone), at this time, the function of "pursuing one's hand and following one's body" of the armrest and the chair back is very important, in this embodiment, both the armrest and the chair back can be adjusted to meet different use requirements, when working or relaxing and entertainment, the armrest rotates along with the positions of both hands, most of the arms can fall on the armrest, the "herringbone" chair keel 1 can be stably supported, and the chair back still has higher safety performance after being adjusted to be low; on the problem of different body types of sanitary ware users, the adjustable seat frame 2 and the backrest 4 are adopted, the front-back distance of the adjustable seat frame 2 and the height of the backrest 4 can be adjusted, the adjustable seat frame is suitable for users with higher stature, and the arc-shaped structure of the adjustable seat frame 2 has a large sitting area.

In conclusion, the multifunctional office chair has various flexible and adjustable structures, including the height-adjustable backrest 4, the horizontal distance and height-adjustable seat frame 2 and the adjustable armrest 7 which can rotate in a large range, can meet the use requirements under various conditions, can be used comfortably by users with different body types, and has remarkable improvement significance.

Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the invention as defined by the appended claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a multifunctional office chair, includes seat fossil fragments, adjustable seat frame and back of the chair, its characterized in that:

the seat frame is characterized in that the seat keel is in a herringbone shape, the feet of the seat keel extend downwards and are connected with each other to form a keel frame seat for mounting the adjustable seat frame, the chair back comprises a backrest and an arched backrest waist which are separately arranged, the backrest and the arched backrest waist are mounted on the seat keel, the backrest can slide along the ridge direction of the seat keel, a bearing chassis is arranged at the bottom of the adjustable seat frame, and the keel frame seat extends to form a pair of buckling arms which are screwed on one side of the bearing chassis; adjustable handrails are respectively installed at the joint of the foot of a seat keel and a keel frame seat, each adjustable handrail comprises a handrail part, a rotating part and a lifting part, the handrail part is embedded in one end of the rotating part, the other end of the rotating part is provided with a female end interface, one end of the lifting part is embedded in the keel frame seat, the other end of the lifting part is provided with a male end interface perpendicular to the lifting part, the rotating part and the lifting part are connected in a matched manner through the female end interface and the male end interface, a chair back angle adjusting mechanism, a lifting pneumatic cylinder and a chute are arranged in the bearing chassis, the buckling arm extends into the bearing chassis and is screwed with the bearing chassis, the chair back angle adjusting mechanism is respectively connected with a buckling arm through a lead, the lifting pneumatic cylinder is externally connected with a pneumatic rod and a pneumatic adjusting plate for adjusting the pneumatic rod, the bottom end of the pneumatic rod is sleeved with a five-star foot seat, one side of the bearing chassis is provided with a strip-shaped chute, and a plurality of sets of teeth are formed on one side of the strip-shaped sliding groove, and positioning blocks are arranged in the direction of the teeth.

2. The multifunctional office chair of claim 1, wherein: female end interface is equipped with arm lock and lower arm lock, goes up the arm lock and is formed with the connection chamber down between the arm lock, the middle part of public end interface is equipped with the counter shaft arm that adapts to in connection chamber, and the upper and lower both sides of counter shaft arm leave respectively and press from both sides the arm lock chamber, goes up the outside of arm lock, lower arm lock and counter shaft arm and is convex arc shape, connects the inboard surface in chamber and clamp arm chamber and is concave arc shape.

3. The multifunctional office chair of claim 2, wherein: the inboard of fossil fragments frame seat is equipped with vertical lift rail, and vertical lift rail comprises the syntropy range of multiunit spacer, the bottom of lift portion is installed the lifting tooth and is pressed the bullet hook, and the lifting tooth form has the hookup groove that is used for the joint spacer and the adaptation is in pressing the bullet hook groove of bullet hook, and bullet hook groove and hookup groove are located the opposite side of lifting tooth respectively, and the lifting tooth has connect and has pushed away the torsional spring to vertical lift rail direction with the hookup groove, and the one end and the lifting tooth of torsional spring are connected, and the other end of torsional spring is connected with one side of lift portion.

4. The multifunctional office chair of claim 2, wherein: the bottom of handrail portion is opened there is the sliding tray, and the rotating part is equipped with the rotatory arch of adaptation in the sliding tray, and handrail portion movable mounting is equipped with the activity stopper that is used for restricting handrail portion sliding range in the handrail portion on rotatory arch, the activity stopper is fixed on rotatory arch, leaves the activity space between the both ends of activity stopper and the inner chamber of handrail portion, and handrail portion top cover is equipped with soft handrail.

5. The multifunctional office chair of claim 1, wherein: the backrest is in a trapezoidal shape with a narrow upper part and a wide lower part, a concave surface which is back to the seat keel is formed on the backrest along the vertical direction, and the top end of the backrest is outwards bent to form a V-shaped neck protection part.

6. The multifunctional office chair of claim 1, wherein: the backrest is arranged on the upper edge of the seat keel in a sliding mode, a lifting clamping groove which is longitudinally formed and a positioning loop which is formed by a plurality of annular holes are formed in the inner side of the seat keel, a positioning rod is fixed to the inner side of the backrest, a plurality of groups of helical teeth are arranged on one side of the lifting clamping groove, a limiting jacking block is arranged at the top of the lifting clamping groove, one end of the positioning rod is in a hook shape corresponding to the annular holes, and a clamping rod which is used for being clamped on the helical teeth is fixed to the backrest.

7. The multifunctional office chair of claim 1, wherein: the bottom of adjustable seat frame is equipped with the control lever that is used for adjusting adjustable seat frame height, adjustable seat frame front and back position and back of the body angle, the one end of control lever is connected with the ball-type connector, the both sides of ball-type connector are equipped with first wire clamping groove and second wire clamping groove respectively, the tip of ball-type connector is equipped with third wire clamping groove, wherein, first wire clamping groove connects the first wire that is used for dragging back of the body angle adjustment mechanism, second wire clamping groove connects the second wire that is used for the locating piece, third wire clamping groove connects the third wire that is used for dragging the atmospheric pressure regulating plate.

8. The multifunctional office chair of claim 1, wherein: the adjustable seat frame comprises a left seat frame, a right seat frame, a front seat frame and a rear seat frame which are in arc shapes, wherein the left seat frame and the right seat frame are upwards protruded, the left seat frame and the right seat frame are inclined inwards and downwards, the front seat frame and the rear seat frame are downwards sunken, and the arc length and the radian of the front seat frame are larger than those of the rear seat frame.

9. The multifunctional office chair of claim 1, wherein: the backrest, the arched backrest waist and the adjustable seat frame are of hollow frame-shaped structures, and thin cloth velvet is laid on the backrest, the arched backrest waist and the adjustable seat frame.