CN111513504A

CN111513504A - Multifunctional office chair

Info

Publication number: CN111513504A
Application number: CN202010376895.4A
Authority: CN
Inventors: 赵吉强; 苟华刚; 惠海岗; 辛艺
Original assignee: Chongqing Yanfeng Adient Automotive Components Co Ltd
Current assignee: Chongqing Adient Automotive Components Co Ltd
Priority date: 2020-05-07
Filing date: 2020-05-07
Publication date: 2020-08-11

Abstract

The invention discloses a multifunctional office chair, which comprises a support; a seat plate installed at an upper end of the support in a forward and backward rotating manner by a seat plate driving mechanism; a backrest rotatably connected to the seat plate, and provided with an elastic member at a position corresponding to the rotational connection, the elastic member applying a force to the backrest to rotate toward a front end of the seat plate; and the leg support is arranged at the front end of the seat board in a turnover folding mode through a turnover folding mechanism. The invention has the beneficial effects that: the office chair has the functions of supporting legs, supporting backrest by elastic buffering and adjusting the inclination angle of the seat board, can provide multiple use modes of sitting posture, leisure posture and lying posture for a user, can be adjusted by self according to self requirements when the user uses the office chair, enables the cervical vertebra, the lumbar vertebra, the thigh and other parts to be in a healthy and relaxed state constantly, accords with ergonomics, and has good comfort and high-grade feeling.

Description

Multifunctional office chair

Technical Field

The invention belongs to the technical field of office furniture, and particularly relates to a multifunctional office chair.

Background

For office workers, most of the working days are occupied by the seat, and the seat with reasonable structural design and good comfort has positive significance for relieving fatigue of long-time sitting.

In the prior art, the office chair has a single structure, and can not have the functions of leg support, backrest inclination angle adjustment, integral seat inclined support and the like well, so that the support of the chair for a human body is not in accordance with the human engineering, and therefore, the cervical vertebra, the lumbar vertebra, the hip and other parts of a user who sits for a long time are easy to feel uncomfortable, and the comfort of the chair is further improved.

Disclosure of Invention

In view of the above, the present invention provides a multifunctional office chair to solve the technical defects of poor ergonomics and poor comfort of the existing chair.

In order to achieve the purpose, the technical scheme of the invention is as follows:

a multifunctional office chair is characterized by comprising:

a support;

the seat plate is arranged at the upper end of the support through a seat plate driving mechanism and can rotate around the support back and forth under the action of the seat plate driving mechanism;

a backrest which is rotatably connected to the seat plate and in which an elastic member is disposed at a position corresponding to the rotational connection, and which applies a force to the backrest so as to keep the backrest in a tendency of rotating toward the front end of the seat plate;

the leg support is arranged at the front end of the seat board through the overturning and folding mechanism and can move between an opening position and a folding position under the action of the overturning and folding mechanism.

By adopting the structure, the office chair has the functions of leg support, backrest elastic buffer support and chair plate inclination angle adjustment, can provide multiple use modes of sitting posture, leisure posture and lying posture for users, ensures the comfort of normal office work, sits and stands, and meets the recumbent rest of noon break. Meanwhile, when the user uses the pillow, the user can adjust the angle according to the self demand, so that the cervical vertebra, the lumbar vertebra, the thigh and other parts are in a healthy and relaxed state all the time, the pillow accords with the ergonomics, and is good in comfort and high in quality.

Preferably, the method comprises the following steps: and a locking device is arranged between the backrest and the seat plate and used for limiting the rotation of the backrest relative to the seat plate in the rotation stroke of the backrest. By adopting the structure, the backrest can be fixedly kept at a certain angle under the locking state of the locking device, so that the reclining rest of the user in noon break is facilitated, and the wider use requirement is met.

Preferably, the method comprises the following steps: the middle part downside of bedplate is equipped with two sets of downwardly extending's adapter, and the back lower extreme is equipped with the supporter that extends towards the adapter direction, and the supporter articulates respectively two sets through two back shafts on the adapter, elastomeric element is the suit and is in the epaxial torsional spring of back. By adopting the structure, the backrest and the seat board can be assembled in a rotating way, the rotating connection position can be positioned at the lower side of the middle part of the seat board, and the whole balance of the seat can be improved after the back of a human body is inclined.

Preferably, the method comprises the following steps: the lower side of the seat plate is provided with a hardness adjusting mechanism which comprises traction components which can be arranged on the two groups of adapter seats in a front-back movement mode and a control assembly for controlling the traction components to move, one end of the torsion spring is supported on the supporting body, and the other end of the torsion spring is hung on the traction components. By adopting the structure, the hardness of the torsion spring can be changed by controlling the traction part to move back and forth, so that the wider use requirement of a user is met.

Preferably, the method comprises the following steps: the bedplate actuating mechanism includes that the setting is at the arc pinion rack of bedplate both sides, rotate gear and drive gear pivoted drive assembly who installs on the support, arc pinion rack and gear engagement, the leading wheel is installed respectively to the support both sides, be equipped with the arc platform limit with leading wheel rolling contact on the arc pinion rack. By adopting the structure, the driving component can control the seat plate to rotate when working, thereby realizing the adjustment of the inclination angle of the seat plate.

Preferably, the method comprises the following steps: the driving assembly comprises a first motor, a speed reducing mechanism and a driving shaft which are in power connection in sequence, wherein two ends of the driving shaft are fixedly sleeved on the gear. By adopting the structure, the first motor can drive the seat board to rotate at the upper end of the support when working.

Preferably, the method comprises the following steps: : the support is equipped with the anticreep guide part in the position that corresponds the inboard edge of arc pinion rack, is equipped with trapezoidal annular on the anticreep guide part, be equipped with the location portion that suits with trapezoidal annular groove on the inboard edge of arc pinion rack. Adopt above-mentioned structure, can let the arc pinion rack keep between leading wheel and anticreep guide part, the reliability of reinforcing use.

Preferably, the method comprises the following steps: the turnover folding mechanism comprises a connecting rod assembly and a driving system for driving the connecting rod assembly to move, the connecting rod assembly comprises a front connecting rod and a rear connecting rod, the two ends of the front connecting rod and the two ends of the rear connecting rod are respectively hinged to the seat plate and the leg supports, the driving system comprises a second motor, a speed reduction assembly and a rotating shaft which are sequentially in power connection, and the end part of the rotating shaft is fixedly connected to the front connecting rod or the rear connecting rod. By adopting the structure, the second motor can drive the leg support to be unfolded or retracted when working, the connecting rod assemblies are arranged on two sides of the leg support by adopting the four-connecting-rod mechanism, and the leg support has reliable supporting performance after being unfolded for use.

Preferably, the method comprises the following steps: the leg support comprises a lower support plate and an upper support plate which is slidably mounted on the upper side of the lower support plate, a linkage mechanism is mounted between the lower support plate and the upper support plate and comprises a first linkage part, a second linkage part, a third linkage part and a fourth linkage part which are connected in sequence in a rotating mode, one end, far away from the third linkage part, of the fourth linkage part is connected to the lower side of the upper support plate in a rotating mode, the middle of the third linkage part is connected to the lower side of the lower support plate in a rotating mode, a linkage straight groove is formed in the position, corresponding to the position where the second linkage part is connected with the third linkage part in a rotating mode, of the second linkage part, the rotating center line of the third linkage part is perpendicular to the rotating center line of the first linkage part, relative to the second linkage part, and one end, far. Adopt above-mentioned structure, the leg holds in the palm and comprises last backup pad and bottom suspension fagging sliding assembly, can expand automatically under link gear's drive during the use for go up the backup pad and slide to farther position, in order to ensure that the leg holds in the palm the foot that can support the user more far away, also can increase the support area that the leg held in the palm like this simultaneously, has promoted user's use travelling comfort effectively, is rich in senior sense.

Preferably, the method comprises the following steps: the lock-up device comprises a lock plate fixedly mounted on the support body, a mounting seat fixedly mounted on the lower side of the seat plate, a lock tongue movably mounted in the mounting seat through a spring, and an operating member for controlling the lock tongue to overcome the elasticity of the spring to move in the mounting seat, wherein a first tooth part is arranged on the lock plate, a second tooth part matched with the first tooth part is arranged on the lock tongue, and the operating member is controlled to control the engagement or separation of the first tooth part and the second tooth part so as to lock or unlock the backrest. By adopting the structure, in the locking state, the spring exerts elastic force upwards to enable the second tooth part to be meshed with the first tooth part to limit the rotation of the locking plate, thereby realizing the locking of the inclination angle of the backrest. When the backrest needs to be unlocked, the operating component controls the lock tongue to move downwards, so that the second tooth part is separated from the first tooth part, and the backrest is unlocked.

Compared with the prior art, the invention has the beneficial effects that:

the office chair has the functions of leg support, backrest elastic buffer support and seat board inclination angle adjustment, can provide multiple use modes of sitting posture, leisure posture and lying posture for a user, ensures comfortable sitting and standing of normal office work, and meets recumbent rest of noon break. Meanwhile, when the user uses the pillow, the user can adjust the angle according to the self demand, so that the cervical vertebra, the lumbar vertebra, the thigh and other parts are in a healthy and relaxed state all the time, the pillow accords with the ergonomics, and is good in comfort and high in quality.

Drawings

FIG. 1 is a schematic view of a multi-functional office chair;

FIG. 2 is a schematic structural view of the reaction seat plate rotatably connected with the support;

FIG. 3 is an exploded view of FIG. 2;

fig. 4 is a structural schematic view of the arc-shaped toothed plate;

FIG. 5 is a schematic view showing the arrangement of the underside of the seat plate;

FIG. 6 is a schematic view showing the structure of the support body, the support shaft, the elastic member, etc. of FIG. 5;

FIG. 7 is a schematic view of the structural arrangement of the reaction hardness adjusting mechanism at the lower side of the seat plate;

FIG. 8 is a schematic structural view of the steering assembly (with the gearbox housing hidden);

FIG. 9 is a schematic view of the latch;

FIG. 10 is an exploded view of the latch;

FIG. 11 is a cross-sectional view of the mount;

fig. 12 is a schematic structural view of the locking tongue;

FIG. 13 is a schematic structural view of the operating member;

FIG. 14 is a schematic view of a leg rest configuration;

FIG. 15 is another schematic view of the leg rest configuration (bottom side up view);

fig. 16 is a partial enlarged view of fig. 15 at point i.

Detailed Description

The present invention will be further described with reference to the following examples and the accompanying drawings.

As shown in fig. 1 and 5, a multifunctional office chair mainly relates to the following components: the seat plate driving mechanism 6 can change the inclination angle of the seat plate 1. The lower extreme of back 2 is equipped with supporter 2a, and supporter 2a rotates through elastomeric element 5 to be connected at bedplate 1 downside, and in this embodiment, elastomeric element 5 preferably adopts the torsional spring, and the user sits back on bedplate 1, and human back can promote back 2 and topple over backward, and the torsional spring can provide certain elastic buffer power at this in-process, and the travelling comfort is better, and back 2 is then automatic kick-backed to the initial position after human back receives power. The leg support 7 is arranged at the front end of the seat board 1 in a turnover way through a turnover folding mechanism 8.

As shown in fig. 5 and 6, in order to facilitate the assembly of the supporting body 2a in a rotating manner, two sets of adapter seats 1a extending downward are disposed at the lower side of the middle portion of the seat plate 1, the supporting body 2a extends from the lower end of the backrest 2 toward the adapter seats 1a, the supporting body 2a is hinged to the two sets of adapter seats 1a through two supporting shafts 2b, and the number of the torsion springs is two and the torsion springs are respectively sleeved on the two supporting shafts 2 b.

The lower side of the seat plate 1 is provided with a hardness adjusting mechanism 9 which comprises a traction part 9b which can be arranged on the two sets of adapter seats 1a in a front-back movement mode and an operation component 9a for controlling the traction part 9b to move, one end of a torsion spring is supported on the supporting body 2a, the other end of the torsion spring is hung on the traction part 9b, the operation component 9a is used for controlling the traction part 9b to move in a front-back movement mode, the hardness of the torsion spring can be changed, and therefore the wider use requirements of users are met.

Further, as shown in fig. 6, 7 and 8, the operating assembly 9a includes a gear box 9a1, a force transmission shaft 9a2, an intermediate component 9a3 and a hand lever 9a4, wherein the gear box 9a1 is fixed on the lower side of the seat plate 1, a turbine d and a worm e which are meshed with each other are arranged in the gear box 9a1, the force transmission shaft 9a2 is fixedly sleeved on the turbine d, the force transmission shaft 9a2 is in threaded connection with the intermediate component 9a3, the middle part of the traction component 9b is connected to the intermediate component 9a3, the hand lever 9a4 is connected to the worm e and extends out of one side of the width direction of the seat plate 1, and the hand lever 9a4 is controlled to rotate manually or electrically, so as to drive the traction component 9b to move back and forth, thereby adjusting the hardness of the torsion spring, further adjusting the rotational resistance of the backrest 2, and meeting the wider.

As shown in fig. 5 and 7, a lock 3 is provided between the backrest 2 and the seat plate 1 in order to restrict the rotation of the backrest 2 with respect to the seat plate 1 and to fixedly hold the backrest 2 at a certain inclination.

Further, as shown in fig. 9 to 13 again, the specific structure of the locker 3 is as follows:

the components related to the locking device 3 include a lock plate 31, a lock tongue 32, a movable lock column 3b, a mounting seat 3a and an operating component 3c, wherein the lock plate 31 is fixedly installed on a support body 2a, namely, fixedly installed on the backrest 2, the lock plate 31 is provided with a first tooth part 31a, the lock tongue 32 is provided with a second tooth part 32a matched with the first tooth part 31a, the mounting seat 3a is fixedly installed between two groups of adapter seats 1a of the seat plate 1, the mounting seat 3a is provided with a mounting hole 3a1, the lower end of the movable lock column 3b is slidably assembled in the mounting hole 3a1 through a spring 3e, the upper end of the movable lock column 3b is provided with a connecting column 3b3, the lower end of the lock tongue 32 is provided with a circular hole 32e, the connecting column 3b3 is slidably assembled in the circular hole 32e, the circumferential direction of the movable lock column 3b is distributed with a positioning block 3b1 which protrudes outwards in the radial direction, the upper end, the lower end of the lock tongue 32 is provided with a second inclined surface 32d which is in sliding contact with the first inclined surface 3b2, a guide block 32b which protrudes outwards in the radial direction is distributed on the circumferential direction of the lock tongue 32, a positioning structure group 3a2 which protrudes inwards in the radial direction is distributed on the inner wall of the mounting hole 3a1, a sliding groove 3a3 is arranged between every two adjacent positioning structure groups 3a2, in the locked state, the positioning block 3b1 and the guide block 32b are both located in the sliding groove 3a3, in the unlocked state, only the guide block 32b is located in the sliding groove 3a3, the positioning structure group 3a2 comprises a locking portion 3a4 and an unlocking portion 3a5, the lower end of the locking portion 3a4 is provided with a locking inclined surface 3a6 which extends to the side wall of the unlocking portion 3a5 in an inclined manner, and the lower end of the unlocking portion 3a5 is provided with an unlocking inclined surface 3 a.

When the backrest 2 needs to be fixed and kept at a certain angle, the lock-out device 3 is controlled to enable the second tooth portion 32a to be meshed with the first tooth portion 31a, so that the backrest 2 can be locked, in the locked state, the guide block 32b and the positioning block 3b1 are both located in the sliding groove 3a3, the upward elastic force exerted by the spring 3e drives the movable lock column 3b and the lock tongue 32 to move upwards, the upper end of the lock tongue 32 is abutted against the lock plate 31, the second tooth portion 32a is meshed with the first tooth portion 31a, the lock plate 31 cannot rotate relative to the lock tongue 32, the backrest 2 is locked, and the included angle between the backrest 2 and the seat plate 1 is kept fixed. When the lock tongue 32 needs to be unlocked again, the operating member 3c can control the lock tongue 32 to move downwards, in the process of moving the lock tongue 32 downwards, the second inclined surface 32d is abutted to the first inclined surface 3b2, and the movable lock column 3b is pushed to slide downwards in the mounting hole 3a1, when the first inclined surface 3b2 slides to the position of the locking inclined surface 3a6, due to the inclined cooperation effect of the second inclined surface 32d and the first inclined surface 3b2, the movable lock column 3b can rotate, so that the first inclined surface 3b2 slides to the locking inclined surface 3a6, at this time, the movable lock column 3b cannot move upwards, the spring 3e is blocked to apply force to the lock tongue 32, and the second tooth part 32a is not combined with the first tooth part 31a, that is, the lock tongue 32 is separated from the lock plate 31, and the unlocking of the backrest 2 is achieved. Based on the principle, when the backrest 2 needs to be locked again, the lock tongue 32 can be pressed again to move downwards, the second inclined surface 32d firstly pushes the first inclined surface 3b2 to slide to the position of the unlocking inclined surface 3a7, then the movable lock cylinder 3b rotates, the positioning block 3b1 slides into the sliding groove 3a3 again through the unlocking inclined surface 3a7, and the spring 3e enables the upper end of the lock tongue 32 to be propped against the lock plate 31 again, so that the backrest 2 is locked again.

Furthermore, in order to facilitate unlocking operation, the operating member 3c is provided with a rotating hole 3c1, a drawing hole 3c2 and a pressing groove 3c3, the latch 32 is provided with a guide post 32c located in the pressing groove 3c3, a drawing rope 3d is connected in the drawing hole 3c2, the operating member 3c is rotatably installed between the two sets of adapter sockets 1a of the seat plate 1 through the rotating hole 3c1, and the operating member 3c is dragged by the drawing rope 3d to rotate around the rotating hole 3c1, so that the pressing groove 3c3 can rotate downwards and drive the guide post 32c to move downwards, and the pressing operation on the latch 32 is realized. The pulling rope 3d can be led out to the seat arm rest or other convenient operation positions through the conversion device, so that the controllability of unlocking is improved.

As shown in fig. 2, 3 and 4, the seat plate driving mechanism 6 includes arc-shaped toothed plates 6a fixedly assembled at two sides of the seat plate 1, a gear 6b rotatably installed on the support 4, and a driving assembly 6c for driving the gear 6b to rotate, the arc-shaped toothed plates 6a are engaged with the gear 6b, guide wheels 6d are respectively installed at two sides of the support 4, arc-shaped toothed plates 6a are provided with arc-shaped platform edges 6a1 in rolling contact with the guide wheels 6d, the driving assembly 6c includes a first motor 6c1, a speed reduction mechanism 6c2 and a driving shaft 6c3 which are connected in sequence by power, wherein two ends of the driving shaft 6c3 are fixedly sleeved on the gear 6b, based on the above structural layout, when the inclination angle of the seat plate 1 needs to be adjusted, the first motor 6c1 is started, the output power generated by the first motor 6c1 is rotated through the speed reduction mechanism 6c2 and the driving shaft 6c3, the gear 6b drives the arc-shaped toothed plates 6a to rotate on, thereby realizing the adjustment of the inclination angle of the seat plate 1.

When the inclination angle of the seat plate 1 is adjusted, in order to keep the arc toothed plate 6a and the gear 6b engaged all the time and ensure the reliability of the rotation of the seat plate 1, the support 4 is provided with an anti-falling guide part 6e at a position corresponding to the inner side edge of the arc toothed plate 6a, the anti-falling guide part 6e is provided with a trapezoidal ring groove 6e1, and the inner side edge of the arc toothed plate 6a is provided with a positioning part 6a2 adapted to the trapezoidal ring groove 6e 1.

As shown in fig. 14 and 15, the turnover folding mechanism 8 includes a link assembly 8a and a driving system 8b for driving the link assembly 8a to move, the link assembly 8a includes a front link 8a1 and a rear link 8a2, both ends of the front link 8a1 and the rear link 8a2 are respectively hinged on the seat plate 1 and the leg rest 7, the driving system 8b includes a second motor 8b1, a speed reduction assembly 8b2 and a rotating shaft 8b3 which are connected in sequence by power, wherein the end of the rotating shaft 8b3 is fixedly connected to the rear link 8a2, for balancing the force, both sides of the connecting position of the seat plate 1 and the leg rest 7 are provided with the second motor 8a, the second motor 8b1 is activated, and the output power of the second motor 8b1 is transmitted to the rear link 8a2 of the link assembly 8a through the speed reduction assembly 8b2 and the rotating shaft 8b3, thereby driving the leg rest 7 to turn upwards relative to the seat plate 1.

The leg support 7 comprises a lower support plate 7a and an upper support plate 7b which is slidably mounted on the upper side of the lower support plate 7a, a linkage mechanism 7c is mounted between the lower support plate 7a and the upper support plate 7b, and when the leg support 7 is turned upwards relative to the seat plate 1 for use, the linkage mechanism 7c can force the upper support plate 7b to slide on the lower support plate 7a, so that the upper support plate 7b slides to a farther position, thereby ensuring that the leg support 7 can support the feet of a user at a farther position and increasing the support area of the leg support 7.

Further, as shown in fig. 15 and 16, the specific structural arrangement of the link mechanism 7c is as follows:

the linkage mechanism 7c is composed of a first linkage part 7c1, a second linkage part 7c2, a third linkage part 7c3 and a fourth linkage part 7c4 which are connected in turn in a rotating way, wherein, a rotating pin 7b1 is arranged at the lower side of the front end of the upper supporting plate 7b, one end of the fourth linkage part 7c4 far away from the third linkage part 7c3 is connected to the rotating pin 7b1 in a rotating way, the middle part of the third linkage part 7c3 is rotatably arranged at the middle position of the lower side of the lower supporting plate 7a, one end of the third linkage part 7c3 far away from the fourth linkage part 7c4 is provided with an assembling pin b, a linkage straight groove a is arranged on the second linkage part 7c2, an arc-shaped groove c is arranged at the position of the lower supporting plate 7a corresponding to the linkage straight groove a, two ends of the assembling pin b are respectively installed in the linkage straight groove a and the arc-shaped groove c in a sliding way, one end of the first linkage part 1 far away from the second, the rotation center line of the third interlocking part 7c3 relative to the second interlocking part 7c2 is perpendicular to the rotation center line of the first interlocking part 7c1 relative to the second interlocking part 7c2, and during the process that the second motor 8b1 drives the leg support 7 to turn over, unfold or retract, the included angle between the lower support plate 7a and the seat plate 1 is changed, so that the assembling pin b moves in the interlocking straight groove a, and the third interlocking part 7c3 is forced to rotate around the hinge point between the third interlocking part and the lower support plate 7a, and the upper support plate 7b is driven to slide back and forth on the lower support plate 7 a.

The office chair has the functions of supporting the leg support 7, supporting the backrest 2 through elastic buffering, locking the backrest 2 and adjusting the inclination angle of the seat plate 1, can provide multiple use modes such as sitting posture, leisure posture and lying posture for a user, can perform corresponding angle adjustment according to self requirements when the user uses the office chair, enables the parts such as cervical vertebra, lumbar vertebra and thigh to be in the most relaxed posture at all times, and achieves the purposes of reducing blood pressure, improving blood circulation, relieving waist and back pain, relaxing body and mind and relieving fatigue.

Finally, it should be noted that the above-mentioned description is only a preferred embodiment of the present invention, and those skilled in the art can make various similar representations without departing from the spirit and scope of the present invention.

Claims

1. A multi-function office chair, comprising:

a support (4);

the seat plate (1) is arranged at the upper end of the support (4) through a seat plate driving mechanism (6) and can rotate around the support (4) back and forth under the action of the seat plate driving mechanism (6);

a backrest (2) which is rotatably connected to the seat plate (1), and in which an elastic member (5) is disposed at a position corresponding to the rotational connection, and the backrest (2) can be kept in a tendency of rotating toward the front end of the seat plate (1) by a force applied to the backrest (2) by the elastic member (5);

the leg support (7) is arranged at the front end of the seat board (1) through a turnover folding mechanism (8) and can move between an opening position and a folding position under the action of the turnover folding mechanism (8).

2. The multifunctional office chair of claim 1, wherein: and a locking device (3) is arranged between the backrest (2) and the seat plate (1) and used for limiting the rotation of the backrest (2) relative to the seat plate (1) in the rotation stroke of the backrest (2).

3. The multifunctional office chair of claim 2, wherein: the middle part downside of bedplate (1) is equipped with two sets of downwardly extending's adapter (1a), and back (2) lower extreme is equipped with supporter (2a) towards adapter (1a) direction extension, and supporter (2a) articulate respectively two sets of through two back shaft (2b) on adapter (1a), elastomeric element (5) are the torsional spring of suit on back shaft (2 b).

4. The multifunctional office chair of claim 3, wherein: the lower side of the seat plate (1) is provided with a hardness adjusting mechanism (9) which comprises a traction part (9b) which can be arranged on the two sets of adapter seats (1a) in a front-back moving mode and an operation component (9a) for controlling the traction part (9b) to move, one end of the torsion spring is supported on the supporting body (2a), and the other end of the torsion spring is hung on the traction part (9 b).

5. A multifunctional office chair as claimed in claim 1 or 2 or 3 or 4, wherein: bedplate actuating mechanism (6) rotate gear (6b) of installing on support (4) and drive gear (6b) pivoted drive assembly (6c) including setting up arc pinion rack (6a) in bedplate (1) both sides, arc pinion rack (6a) and gear (6b) meshing, leading wheel (6d) are installed respectively to support (4) both sides, be equipped with arc platform limit (6a1) with leading wheel (6d) rolling contact on arc pinion rack (6 a).

6. The multifunctional office chair of claim 5, wherein: the driving assembly (6c) comprises a first motor (6c1), a speed reducing mechanism (6c2) and a driving shaft (6c3) which are in power connection in sequence, wherein two ends of the driving shaft (6c3) are fixedly sleeved on the gear (6 b).

7. The multi-function office chair of claim 6, wherein: support (4) are equipped with anticreep guide part (6e) in the position that corresponds the inboard edge of arc pinion rack (6a), are equipped with trapezoidal annular (6e1) on anticreep guide part (6e), be equipped with on the inboard edge of arc pinion rack (6a) with trapezoidal annular (6e1) the location portion (6a2) that suits.

8. A multifunctional office chair as claimed in claim 1 or 2 or 3 or 4, wherein: the turnover folding mechanism (8) comprises a connecting rod assembly (8a) and a driving system (8b) for driving the connecting rod assembly (8a) to move, the connecting rod assembly (8a) comprises a front connecting rod (8a1) and a rear connecting rod (8a2), two ends of the front connecting rod (8a1) and two ends of the rear connecting rod (8a2) are respectively hinged to the seat plate (1) and the leg support (7), the driving system (8b) comprises a second motor (8b1), a speed reduction assembly (8b2) and a rotating shaft (8b3), the second motor, the speed reduction assembly and the rotating shaft are sequentially in power connection, and the end of the rotating shaft (8b3) is fixedly connected to the front connecting rod (8a1) or the rear connecting rod (8a 2).

9. The multi-function office chair of claim 8, wherein: the leg support (7) comprises a lower support plate (7a) and an upper support plate (7b) which is slidably mounted on the upper side of the lower support plate (7a), a linkage mechanism (7c) is mounted between the lower support plate (7a) and the upper support plate (7b), the linkage mechanism (7c) comprises a first linkage part (7c1), a second linkage part (7c2), a third linkage part (7c3) and a fourth linkage part (7c4) which are sequentially connected in a rotating manner, wherein one end, far away from the third linkage part (7c3), of the fourth linkage part (7c4) is connected to the lower side of the upper support plate (7b) in a rotating manner, the middle part of the third linkage part (7c3) is connected to the lower side of the lower support plate (7a) in a rotating manner, a linkage straight groove (a) is arranged at a position corresponding to the rotating connection with the third linkage part (7c3) of the second linkage part (7c2), and a linkage part (7c3) is connected with the rotating center line (4837 c 25) of the first linkage part (7c) and 1 c) corresponding One end of the first linkage component (7c1) far away from the second linkage component (7c2) is connected to the seat plate (1) in a rotating way, and is vertical to the rotating central line of the second linkage component (7c 2).

10. The multifunctional office chair of claim 3, wherein: the lock stopper (3) comprises a lock plate (31) fixedly mounted on a support body (2a), a mounting seat (3a) fixedly mounted on the lower side of the seat plate (1), a lock tongue (32) movably mounted in the mounting seat (3a) through a spring (3e), and an operating member (3c) for controlling the lock tongue (32) to move in the mounting seat (3a) by overcoming the elastic force of the spring (3e), wherein a first tooth part (31a) is arranged on the lock plate (31), a second tooth part (32a) matched with the first tooth part (31a) is arranged on the lock tongue (32), and the operating member (3c) is controlled to control the first tooth part (31a) to be meshed with or separated from the second tooth part (32a) so as to lock or unlock the backrest (2).