CN111513504A - Multifunctional office chair - Google Patents

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, in particular to a multifunctional office chair.

Background technique

For office workers, who spend most of the working day sitting on the seat, a seat with a reasonable structure and good comfort is of positive significance for relieving the fatigue of long-term sitting.

In the prior art, the office chair has a single structure, and cannot combine the functions of leg rest support, backrest inclination adjustment, and overall seat inclination support, etc., so that the seat's support for the human body is not ergonomic, resulting in long-term After sitting, the cervical spine, lumbar spine, buttocks and other parts are prone to discomfort, and the comfort of the seat needs to be further improved.

SUMMARY OF THE INVENTION

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

For achieving the above object, the technical scheme of the present invention is as follows:

The key point of a multifunctional office chair is that it includes:

support;

a seat plate, which is installed on the upper end of the support through the seat plate driving mechanism, and can rotate back and forth around the support under the action of the seat plate driving mechanism;

a backrest, which is rotatably connected to the seat plate, and an elastic member is arranged at a position corresponding to the rotational connection, and the force exerted by the elastic member on the backrest can keep the backrest rotating toward the front end of the seat plate;

The leg rest is installed on the front end of the seat panel through a flip-and-fold mechanism, and can move between open and folded positions under the action of the flip-and-fold mechanism.

With the above structure, the office chair has both leg support, backrest elastic cushioning support and seat plate inclination adjustment functions, which can provide users with multiple use modes of sitting, leisure and lying positions, which not only ensures the comfortable sitting in normal office work Stand up and recline for a lunch break. At the same time, users can also adjust the angle according to their own needs, so that the cervical spine, spine, lumbar spine, thighs and other parts are always in a healthy and relaxed state, which is ergonomic, comfortable and full of advanced sense.

Preferably, a lock is arranged between the backrest and the seat plate, which is used to restrict the rotation of the backrest relative to the seat plate within the rotation stroke of the backrest. By adopting the above structure, in the locked state of the lock, the backrest can be fixed and maintained at a certain angle, which is beneficial for the user to recline and rest during a lunch break, and meets wider usage requirements.

Preferably: the lower side of the middle part of the seat plate is provided with two sets of downwardly extending adapter seats, the lower end of the backrest is provided with a support body extending toward the direction of the adapter seat, and the support body is hinged to the two sets of seats through two support shafts respectively. On the adapter seat, the elastic component is a torsion spring sleeved on the support shaft. The above structure facilitates the rotational assembly between the backrest and the seat plate, and the rotational connection position can be located on the lower side of the middle of the seat plate.

Preferably, the lower side of the seat plate is provided with a hardness adjustment mechanism, which includes a traction member movably installed on the two sets of adapter seats and a manipulation assembly for controlling the movement of the traction member, and one end of the torsion spring supports On the support body, the other end is hung on the traction member. By adopting the above structure, the hardness of the torsion spring can be changed by controlling the forward and backward movement of the traction member, so as to meet the wider use requirements of users.

Preferably, the seat plate driving mechanism includes arc-shaped tooth plates arranged on both sides of the seat plate, a gear rotatably mounted on the support, and a drive assembly for driving the gear to rotate. The arc-shaped tooth plate is engaged with the gear, and the Guide wheels are installed on both sides of the support, respectively, and the arc-shaped toothed plate is provided with an arc-shaped table edge that is in rolling contact with the guide wheels. By adopting the above structure, the rotation of the seat plate can be controlled by the operation of the driving component, thereby realizing the adjustment of the inclination angle of the seat plate.

Preferably, the drive assembly includes a first motor, a deceleration mechanism and a drive shaft that are sequentially connected with power, wherein both ends of the drive shaft are fixedly sleeved on the gears. With the above structure, the first motor can drive the seat plate to rotate on the upper end of the support.

As a preference: the support is provided with an anti-separation guide member at the position corresponding to the inner edge of the arc-shaped toothed plate, the anti-separation guide member is provided with a trapezoidal ring groove, and the inner edge of the arc-shaped toothed plate is provided with a trapezoidal shape. The positioning part adapted to the ring groove. By adopting the above structure, the arc-shaped toothed plate can be kept between the guide wheel and the anti-falling guide member, thereby enhancing the reliability of use.

Preferably: the inverting and folding mechanism includes a connecting rod assembly and a drive system for driving the movement of the connecting rod assembly, the connecting rod assembly includes a front connecting rod and a rear connecting rod, and both ends of the front connecting rod and the rear connecting rod are hinged on the seat plate respectively and the leg rest, the drive system includes a second motor, a deceleration assembly, and a rotating shaft that are sequentially powered and connected, wherein the end of the rotating shaft is fixedly connected to the front link or the rear link. With the above structure, the second motor can drive the leg rest to unfold or retract, and the connecting rod assembly adopts a four-link mechanism to be arranged on both sides of the leg rest, and the leg rest has reliable support performance after being unfolded and used.

Preferably, the leg rest includes a lower support plate and an upper support plate slidably installed on the upper side of the lower support plate, a linkage mechanism is installed between the lower support plate and the upper support plate, and the linkage mechanism includes a first linkage member that is rotated and connected in sequence , the second interlocking component, the third interlocking component and the fourth interlocking component, wherein one end of the fourth interlocking component away from the third interlocking component is rotatably connected to the lower side of the upper support plate, and the middle portion of the third interlocking component It is rotatably connected to the lower side of the lower support plate, the second linking member is provided with a linking straight slot at the position corresponding to the third linking member rotatably connected, and the rotation center line of the third linking member is opposite to the first linking member. The rotation center lines of the two interlocking components are vertical, and one end of the first interlocking component away from the second interlocking component is rotatably connected to the seat plate. With the above structure, the leg rest is composed of an upper support plate and a lower support plate that are slidably assembled, and can be automatically unfolded under the driving of the linkage mechanism during use, so that the upper support plate slides to a farther position to ensure that the leg rest can support the user farther At the same time, it can also increase the support area of the leg support, effectively improving the user's comfort and high-end feeling.

Preferably: the locker includes a lock plate fixedly installed on the support body, a mounting seat fixedly installed on the lower side of the seat plate, a lock tongue that is movably installed in the installation seat by a spring, and a control tongue to overcome the elastic force of the spring in A control member that is movable in the mounting seat, the lock plate is provided with a first tooth portion, and the lock tongue is provided with a second tooth portion adapted to the first tooth portion. By manipulating the control member, the first tooth portion can be controlled Engage or disengage with the second tooth portion to lock or unlock the backrest. With the above structure, in the locked state, the spring exerts upward elastic force to make the second tooth part mesh with the first tooth part to limit the rotation of the lock plate, thereby realizing the locking of the backrest inclination angle. When the backrest needs to be unlocked, the operating member controls the locking tongue to move downward to separate the second tooth portion from the first tooth portion, thereby realizing the unlocking of the backrest.

Compared with the prior art, the beneficial effects of the present invention are:

The office chair has both leg support, backrest elastic cushioning support and seat plate inclination adjustment functions, which can provide users with a variety of use modes of sitting, leisure and lying, which not only ensures the comfort of normal office sitting, but also satisfies the Reclining for lunch break. At the same time, users can also adjust the angle according to their own needs, so that the cervical spine, spine, lumbar spine, thighs and other parts are always in a healthy and relaxed state, which is ergonomic, comfortable and full of advanced sense.

Description of drawings

Figure 1 is a schematic structural diagram of a multifunctional office chair;

Fig. 2 is the structural schematic diagram of the rotatable connection between the reaction seat plate and the support;

Fig. 3 is the exploded structure schematic diagram of Fig. 2;

Figure 4 is a schematic structural diagram of an arc tooth plate;

Figure 5 is a schematic diagram of the structural arrangement of the lower side of the seat plate;

6 is a schematic structural diagram of a support body, a support shaft, an elastic member, etc. in FIG. 5;

7 is a schematic diagram of the structural arrangement of the reaction hardness adjustment mechanism on the lower side of the seat plate;

Figure 8 is a schematic structural diagram of the manipulation assembly (gearbox casing has been hidden);

Fig. 9 is the structural representation of the lock;

Figure 10 is a schematic diagram of the exploded structure of the lock;

Figure 11 is a cross-sectional view of the mounting seat;

Figure 12 is a schematic structural diagram of a locking tongue;

Figure 13 is a schematic structural diagram of a manipulation member;

Figure 14 is a schematic structural diagram of a leg rest;

Figure 15 is another structural schematic diagram of the leg rest (bottom side up perspective);

FIG. 16 is a partial enlarged view of part I in FIG. 15 .

Detailed ways

The present invention will be further described below with reference to the embodiments and the accompanying drawings.

As shown in Figures 1 and 5, a multifunctional office chair mainly involves the following components: a support 4, a seat plate 1, a backrest 2 and a leg rest 7, and the seat plate 1 can be rotated back and forth through the seat plate driving mechanism 6 It is installed on the upper end of the support 4 , that is, the seat plate driving mechanism 6 can change the inclination angle of the seat plate 1 . The lower end of the backrest 2 is provided with a support body 2a, and the support body 2a is rotatably connected to the lower side of the seat plate 1 through an elastic member 5. In this embodiment, the elastic member 5 preferably adopts a torsion spring. After the user sits on the seat plate 1, the back of the human body can push The backrest 2 is tilted backward. During this process, the torsion spring will provide a certain elastic buffer force, which is more comfortable. The backrest 2 will automatically rebound to the initial position after the backrest of the human body is retracted. The leg rest 7 is installed on the front end of the seat panel 1 by turning over the folding mechanism 8 .

As shown in Figures 5 and 6, in order to facilitate the assembling of the support body 2a in a rotating manner, two sets of downwardly extending adapter seats 1a are provided on the lower side of the middle part of the seat plate 1. The support body 2a is directed from the lower end of the backrest 2 to the adapter seat Extending in the direction of 1a, the support body 2a is hinged on the two sets of the adapter bases 1a through two support shafts 2b respectively.

The lower side of the seat plate 1 is provided with a hardness adjustment mechanism 9, which includes a traction member 9b that can be moved forward and backward on the two sets of adapter seats 1a and a manipulation assembly 9a that controls the movement of the traction member 9b. One end of the torsion spring is supported on the The other end of the support body 2a is hung on the traction member 9b, and the traction member 9b can be controlled to move back and forth through the manipulation assembly 9a, so that the hardness of the torsion spring can be changed, so as to meet the wider use requirements of users.

Further, as shown in Figures 6, 7 and 8, the operating assembly 9a includes a gear box 9a1, a power transmission shaft 9a2, an intermediate part 9a3 and a handle 9a4, wherein the gear box 9a1 is fixed on the lower side of the seat plate 1, and the gear box 9a1 is built-in There are turbines d and worms e that mesh with each other, the force transmission shaft 9a2 is fixedly sleeved on the turbine d, the force transmission shaft 9a2 is threadedly connected with the intermediate part 9a3, the middle part of the traction part 9b is connected on the intermediate part 9a3, and the hand lever 9a4 is connected on the intermediate part 9a3. On the worm e, and extend out from one side of the width direction of the seat plate 1, control the rotation of the hand lever 9a4 in a manual or electric way, so as to drive the traction member 9b to move back and forth, so as to realize the adjustment of the hardness of the torsion spring, and then adjust the rotation of the backrest 2 resistance, to meet the wider use needs of users.

As shown in FIGS. 5 and 7 , in order to restrict the rotation of the backrest 2 relative to the seat panel 1 and to keep the backrest 2 fixed at a certain inclination angle, a lock 3 is provided between the backrest 2 and the seat panel 1 .

Further, as shown in Figures 9 to 13, the specific structure of the lock 3 is as follows:

The components involved in the lock 3 include a lock plate 31, a lock tongue 32, a movable lock column 3b, a mounting seat 3a and a manipulation member 3c, wherein the lock plate 31 is fixedly installed on the support body 2a, that is, fixedly installed on the backrest 2, and the lock plate 31 is fixedly installed on the support body 2a. The plate 31 is provided with a first tooth portion 31a, the lock tongue 32 is provided with a second tooth portion 32a adapted to the first tooth portion 31a, the mounting seat 3a is fixedly installed between the 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 locking column 3b is slidably assembled in the mounting hole 3a1 through a spring 3e, the upper end of the movable locking column 3b has a connecting column 3b3, and the lower end of the locking tongue 32 has a circular hole 32e, connecting The column 3b3 is slidably assembled in the circular hole 32e, and a positioning block 3b1 protruding radially outward is distributed on the circumference of the movable locking column 3b. There is a second inclined surface 32d slidably abutting with the first inclined surface 3b2, a guide block 32b protruding radially outward is distributed on the circumference of the lock tongue 32, and radially inward protruding is distributed on the inner wall of the mounting hole 3a1. The positioning structure group 3a2, there is a chute 3a3 between two adjacent positioning structure groups 3a2, in the locked state, the positioning block 3b1 and the guide block 32b are located in the chute 3a3, in the unlocked state, only the guide block 32b is located in the chute 3a3, the positioning structure group 3a2 includes a locking portion 3a4 and an unlocking portion 3a5, the lower end of the locking portion 3a4 is provided with a locking slope 3a6 extending obliquely to the side wall of the unlocking portion 3a5, and the lower end of the unlocking portion 3a5 is provided with an inclined It extends to the unlocking slope 3a7 of the chute 3a3.

When the backrest 2 needs to be fixed at a certain angle, the locker 3 is manipulated to engage the second tooth portion 32a with the first tooth portion 31a to complete the locking of the backrest 2. In the locked state, the guide block 32b and the positioning block 3b1 Both are located in the chute 3a3, and the upward elastic force exerted by the spring 3e drives the movable lock post 3b and the lock tongue 32 to move upward, so that the upper end of the lock tongue 32 is pressed against the lock plate 31, and the second tooth portion 32a engages with the first tooth portion 31a. , the locking plate 31 cannot rotate relative to the locking tongue 32 , so as to realize the locking of the backrest 2 , and the angle between the backrest 2 and the seat plate 1 remains fixed. When it needs to be unlocked again, the lock tongue 32 can be controlled to move downward by the operating member 3c. During the downward movement of the lock tongue 32, the second inclined surface 32d abuts against the first inclined surface 3b2, and pushes the movable lock cylinder 3b to install. The hole 3a1 slides downward, and when the first inclined surface 3b2 slides to the position of the locking inclined surface 3a6, due to the oblique cooperation between the second inclined surface 32d and the first inclined surface 3b2, the movable locking post 3b will rotate, so that the first inclined surface 3b2 slides On the locking slope 3a6, at this time, the movable locking cylinder 3b cannot move upward, thereby blocking the force of the spring 3e to the locking tongue 32, and the second tooth portion 32a and the first tooth portion 31a are not combined, that is, the locking tongue 32 and the lock are completed. The plate 31 is separated, thereby realizing the unlocking of the backrest 2 . Based on the above principle, when the backrest 2 needs to be locked again, the locking tongue 32 can be pressed again to move downward, the second inclined surface 32d first pushes the first inclined surface 3b2 to slide to the position of the unlocking inclined surface 3a7, and then the movable lock cylinder 3b rotates, and the positioning block 3b1 passes through The unlocking slope 3a7 slides into the sliding groove 3a3 again, and the spring 3e pushes the upper end of the locking tongue 32 against the locking plate 31 again, thereby realizing the re-locking of the backrest 2 .

Further, in order to facilitate the unlocking operation, the operating member 3c is provided with a rotation hole 3c1, a traction hole 3c2 and a pressing groove 3c3, the locking tongue 32 is provided with a guide post 32c located in the pressing groove 3c3, and a traction rope is connected in the traction hole 3c2. 3d, the operating member 3c is rotatably installed between the two sets of adapter seats 1a of the seat plate 1 through the rotating hole 3c1, and the operating member 3c is dragged by the traction rope 3d to rotate around the rotating hole 3c1, so that the pressing groove 3c3 can be pressed downward. Rotate and drive the guide post 32c to move downward, so as to realize the pressing operation of the lock tongue 32 . The traction rope 3d can be led out to the seat armrest or other convenient operation position through the conversion device, so as to improve the maneuverability of unlocking.

As shown in Figures 2, 3 and 4, the seat plate driving mechanism 6 includes arc tooth plates 6a fixedly assembled on both sides of the seat plate 1, a gear 6b rotatably mounted on the support 4, and a drive assembly 6c for driving the rotation of the gear 6b , the arc-shaped toothed plate 6a meshes with the gear 6b, the guide wheels 6d are respectively installed on both sides of the support 4, and the arc-shaped toothed plate 6a is provided with an arc-shaped table edge 6a1 that is in rolling contact with the guide wheel 6d, and the drive assembly 6c includes sequential power The first motor 6c1, the speed reduction mechanism 6c2 and the drive shaft 6c3 are connected, wherein the two ends of the drive shaft 6c3 are fixedly sleeved on the gear 6b. Based on the above-mentioned structural layout, when the inclination of the seat plate 1 needs to be adjusted, the above-mentioned first motor 6c1 is activated The output power generated by the first motor 6c1 drives the gear 6b to rotate through the deceleration mechanism 6c2 and the drive shaft 6c3, and the gear 6b drives the arc tooth plate 6a to rotate on the two guide wheels 6d, thereby realizing the adjustment of the inclination of the seat plate 1.

When the inclination of the seat plate 1 is adjusted, in order to keep the arc-shaped toothed plate 6a and the gear 6b in mesh all the time, and to ensure the reliability of the rotation of the seat plate 1, the support 4 is provided with a guide member corresponding to the inner edge of the arc-shaped toothed plate 6a. 6e, a trapezoidal ring groove 6e1 is provided on the anti-falling guide member 6e, and a positioning portion 6a2 is provided on the inner edge of the arc-shaped toothed plate 6a which is adapted to the trapezoidal ring groove 6e1.

As shown in FIGS. 14 and 15 , the inverting and folding mechanism 8 includes a link assembly 8a and a drive system 8b for driving the movement of the link assembly 8a. The link assembly 8a includes a front link 8a1 and a rear link 8a2. The front link 8a1 and Both ends of the rear connecting rod 8a2 are hinged on the seat plate 1 and the leg rest 7, respectively. The driving system 8b includes a second motor 8b1, a deceleration assembly 8b2, and a rotating shaft 8b3 that are sequentially connected with power. The end of the rotating shaft 8b3 is fixedly connected to the rear connecting rod. On the rod 8a2, in order to balance the force, connecting rod assemblies 8a are provided on both sides of the connecting position of the seat plate 1 and the leg rest 7, and the second motor 8b1 is activated, and the output power of the second motor 8b1 passes through the deceleration assembly 8b2 and the rotating shaft. 8b3 is transmitted to the rear link 8a2 of the link assembly 8a, so as to drive the leg rest 7 to turn upward relative to the seat plate 1 to realize the unfolding of the leg rest.

The leg rest 7 includes a lower support plate 7a and an upper support plate 7b slidably installed on the upper side of the lower support plate 7a, a linkage mechanism 7c is installed between the lower support plate 7a and the upper support plate 7b, and the leg rest 7 is turned upward 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, so as to ensure that the leg rest 7 can support the user's farther feet and enlarge the leg rest 7 support area.

Further, as shown in Figures 15 and 16, the specific structural arrangement of the linkage mechanism 7c is as follows:

The linkage mechanism 7c is composed of a first linkage member 7c1, a second linkage member 7c2, a third linkage member 7c3 and a fourth linkage member 7c4 that are connected in turn in turn, wherein the lower side of the front end of the upper support plate 7b is provided with a rotating pin. 7b1, the end of the fourth linking member 7c4 away from the third linking member 7c3 is rotatably connected to the rotating pin 7b1, the middle of the third linking member 7c3 is rotatably mounted on the lower middle position of the lower support plate 7a, and the third linking member The end of 7c3 away from the fourth linkage member 7c4 is provided with an assembly pin b, the second linkage member 7c2 is provided with a linkage straight groove a, and the lower support plate 7a is provided with an arc groove c at the position corresponding to the linkage straight groove a, and the assembly pin Both ends of b are slidably installed in the interlocking straight groove a and the arc-shaped groove c, respectively. One end of the first interlocking member 7c1 away from the second interlocking member 7c2 is rotatably connected to the seat plate 1, and the third interlocking member 7c3 is opposite to the second interlocking member 7c3. The rotation centerline of the linking member 7c2 is perpendicular to the rotation centerline of the first linking member 7c1 relative to the second linking member 7c2. During the process of the second motor 8b1 driving the leg rest 7 to turn over, unfold or retract, the lower support plate 7a and the seat The angle between the plates 1 is changed, so that the assembly pin b moves in the linkage straight slot a, thereby forcing the third linkage member 7c3 to rotate around its hinge point with the lower support plate 7a, thereby driving the upper support plate 7b to support the lower support plate 7b. The plate 7a slides back and forth.

The office chair also has the functions of leg rest 7 support, backrest 2 elastic buffer support, backrest 2 locking and seat plate 1 inclination adjustment functions, which can provide users with various usage modes such as sitting, leisure and lying. Adjust the angle according to your own needs, so that the cervical spine, spine, lumbar spine and thighs are always in the most relaxed posture, so as to reduce blood pressure, improve blood circulation, relieve low back pain, relax body and mind and relieve fatigue.

Finally, it should be noted that the above description is only a preferred embodiment of the present invention, and those of ordinary skill in the art can make a variety of similar It is indicated that such transformations fall within the protection scope of the present invention.

Claims (10)

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).

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