A sitting posture linkage multi-directional adjustment office chair

Abstract

The application discloses a sitting posture linkage multi-direction adjusting office chair and relates to the technical field of office chairs. The office chair comprises a base, a seat cushion for bearing a user and a backrest for leaning on the base. The seat cushion is rotatable on the base through a first rotating shaft, and the backrest is rotatable on the base through a second rotating shaft. A folding unit is arranged between the base and the backrest and is used for folding the backrest. A synchronous adjusting unit is arranged between the folding unit and the seat cushion. The synchronous adjusting unit comprises a pushing and moving assembly arranged between the base and the seat cushion. Through linkage cooperation of the backrest folding unit and the synchronous adjusting unit, the seat cushion can be driven to realize backward inclination adjustment around the first rotating shaft through gear, worm and worm gear and wedge block transmission while the backrest is folded around the second rotating shaft. The relative sliding between the user's hips and the seat surface when the user lies down is effectively reduced, the hip muscles are prevented from being tense, synchronous linkage adjustment of the backrest and the seat cushion is realized, the operation steps are simplified, and the use comfort is improved.

Description

Technical Field

[0001] This invention belongs to the field of office chair technology, specifically a multi-directional adjustable office chair with posture linkage. Background Technology

[0002] As office hours increase, people's demands for the comfort and ease of adjustment of office chairs are constantly rising, and multi-directional adjustable office chairs with posture linkage are gradually becoming the mainstream. These office chairs usually have adjustable seat cushions and backrests, designed to reduce physical fatigue by adapting to different sitting postures (such as working at a desk or lying down to rest).

[0003] Existing multi-directional adjustable office chairs with posture linkage cannot achieve simultaneous adjustment of the backrest recline and the seat cushion tilt. When users lie down to rest, because the seat cushion cannot tilt backward in sync with the backrest recline, the user's buttocks tend to slide relative to the seat surface. To counteract this sliding, the buttock muscles need to be tense, which can easily lead to buttock muscle fatigue and tension over time, seriously affecting the comfort of the office chair and failing to meet users' dual needs for convenient and comfortable posture adjustment. Summary of the Invention

[0004] To address the problems mentioned in the background art, the present invention proposes a multi-directional adjustable office chair with posture linkage.

[0005] The objective of this invention can be achieved through the following technical solutions: A multi-directional adjustable office chair with posture linkage includes a base, on which a seat cushion for supporting the user and a backrest for leaning are provided. The seat cushion rotates on the base via a first pivot, and the backrest rotates on the base via a second pivot. A reclining unit is provided between the base and the backrest for reclining the backrest, and a synchronous adjustment unit is provided between the reclining unit and the seat cushion, wherein the synchronous adjustment unit includes, A pushing component is arranged between the base and the seat cushion, and the pushing component is connected to the reclining unit via a linkage component; A movable seat is movably mounted on the top surface of the base, and a wedge block that cooperates with a pushing component is fixedly mounted on the movable seat. The pushing component is used to push the wedge block to move, and a movable block is movably mounted on the top surface of the movable seat. One end of the connecting rod is hinged to the bottom surface of the seat cushion via a first hinge seat, and the other end of the connecting rod is hinged to the movable block via a second hinge seat.

[0006] As a further preferred embodiment of this technical solution: the lying-down unit includes, The third rotating shaft is rotatably mounted on one side of the base. A pawl is fixedly mounted on the third rotating shaft. A grooved wheel that is used in conjunction with the pawl is mounted on the second rotating shaft. A torsion spring is provided between the pawl and the base to drive the pawl to lock the grooved wheel in both directions. A reset mechanism is provided on the second rotating shaft at one end away from the grooved wheel. The reset mechanism includes a fixed housing fixedly provided on the other side of the base. A spiral spring for driving the second rotating shaft to reset is provided between the fixed housing and the second rotating shaft. The claw is equipped with a grip.

[0007] As a further preferred embodiment of this technical solution: the linkage component includes, A drive shaft is rotatably connected to the base, and the drive shaft is arranged parallel to the second rotating shaft; Gear No. 1 is fixedly mounted on shaft No. 2, and gear No. 2, which meshes with gear No. 1, is fixedly mounted on the transmission shaft.

[0008] As a further preferred embodiment of this technical solution: the pushing component includes, There are two worm gears, which are fixed and symmetrically arranged on the drive shaft. Two worm gears are rotatably mounted on the top surface of the base, and each worm gear is meshed with a worm. Each worm gear is fixedly connected to a mounting bracket, and a rotating wheel is rotatably mounted on the end of the mounting bracket away from the worm gear. The rotating wheel is arranged in close contact with the wedge block.

[0009] As a further preferred embodiment of this technical solution: the movable seat is further provided with a separate adjustment module, the separate adjustment module including, The screw drive rod is rotatably mounted on the top surface of the movable seat; An inner spiral groove sleeve is fixedly mounted on the movable block, and the inner spiral groove sleeve is used in conjunction with the spiral drive rod. A drive shaft is rotatably mounted on the base for driving the screw drive rod to rotate. A knob is also provided on the drive shaft, and an adaptive component is provided between the drive shaft and the screw drive rod. The second reset component is located on the top surface of the base and is used to drive the movable block to reset. The second limit component is located on the drive shaft and is used to lock the rotation of the drive shaft in one direction.

[0010] As a further preferred embodiment of this technical solution: the adaptive component includes A slide bar is fixedly connected to the end of a screw drive rod, and a limit bar is fixedly provided on the outer wall of the slide bar. Both the slide bar and the limit bar are slidably disposed on the inner side of the drive shaft.

[0011] As a further preferred embodiment of this technical solution: the second reset component includes, A guide shaft is fixedly mounted on the top surface of the base. The guide shaft is arranged parallel to the screw drive rod, and the movable block is slidably mounted on the guide shaft. A reset spring is sleeved on the outside of the guide shaft, and a limit block is provided at the end of the guide shaft. The two ends of the reset spring are fixedly connected to the limit block and the movable block, respectively.

[0012] As a further preferred embodiment of this technical solution: the second limiting component includes, The fourth rotating shaft is rotatably mounted on the base, and the second pawl is fixedly connected to the fourth rotating shaft. The second ratchet wheel, which is used in conjunction with the second pawl, is fixedly mounted on the drive shaft. A second torsion spring is provided between the fourth rotating shaft and the base to drive the second pawl to lock the second ratchet wheel in one direction. A second grip is fixedly mounted on the second pawl.

[0013] As a further preferred embodiment of this technical solution: two slide rails are provided on the top surface of the base, and the movable seat is slidably mounted on the slide rails, and a second reset spring for driving the movable seat to reset is provided between each slide rail and the movable seat.

[0014] As a further preferred embodiment of this technical solution: a lifting frame is provided on the bottom surface of the base, and a caster wheel is provided at the bottom of the lifting frame.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, through the linkage between the backrest reclining unit and the synchronous adjustment unit, while the backrest reclines around the second pivot, the moving seat and connecting rod can be driven synchronously around the first pivot via gears, worm gears and wedge blocks to achieve backward tilt adjustment. This effectively reduces the relative sliding between the user's buttocks and the seat surface when lying down, avoids tension in the buttock muscles, and achieves synchronous linkage adjustment between the backrest and the seat, simplifying the operation steps and improving user comfort.

[0016] 2. In this invention, a separate adjustment module is added to the linkage adjustment structure. Through the cooperation of the knob, drive shaft, spiral transmission rod and inner spiral groove sleeve, the movable block and linkage can be driven independently to achieve individual fine adjustment of the seat cushion angle. Moreover, the adjustment process does not change the predetermined angle of the backrest, making the seat adjustment more flexible and meeting the personalized sitting posture needs of different users.

[0017] 3. In this invention, the sliding rod and limiting bar structure in the adaptive component ensure smooth switching between the two adjustment modes without affecting each other and preventing jamming. When the moving seat drives the movable block to move in linkage, the screw transmission rod can move relative to the drive shaft, while the drive shaft and knob positions remain fixed and will not be forced to shift with the seat cushion linkage adjustment, making it convenient for users to quickly locate and operate the knob, thus improving ease of use. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a side view of the present invention; Figure 3 This is a partial structural diagram of the present invention; Figure 4 This is a schematic diagram of the backrest structure of the present invention; Figure 5 This is a partial structural schematic diagram of the synchronization adjustment unit of the present invention; Figure 6 This is a schematic diagram of the structure of the folding unit of the present invention; Figure 7 This is a schematic diagram of the structure of the individual adjustment module of the present invention; Figure 8 for Figure 5 Enlarged view of point A in the middle; Figure 9 for Figure 5 Enlarged diagram of point B in the middle.

[0019] Legend: 1. Base; 11. Slide rail; 2. Seat cushion; 21. First pivot; 3. Backrest; 31. Second pivot; 32. Reset mechanism; 321. Fixed housing; 322. Spiral spring; 33. Claw; 331. First grip; 34. Third pivot; 35. Grooved wheel; 4. Synchronization adjustment unit; 41. Linkage assembly; 411. First gear; 412. Second gear; 413. Drive shaft; 42. Pushing assembly; 421. Worm gear; 422. Worm wheel; 423. Fixed frame; 424. Rotary wheel; 43. Wedge block; 44. Moving element. 45. Seat; 46. Movable block; 47. Linkage rod; 48. No. 1 hinge seat; 49. No. 2 hinge seat; 40. Individual adjustment module; 41. Screw drive rod; 42. Adaptive component; 472. Slide rod; 4722. Limit bar; 473. Drive shaft; 4731. Knob; 475. Inner spiral groove sleeve; 476. Guide shaft; 4761. Limit block; 4762. Return spring; 48. No. 2 limit component; 49. No. 4 rotating shaft; 40. No. 2 pawl; 41. No. 2 grip; 42. No. 2 ratchet; 43. Lifting frame. Detailed Implementation

[0020] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1: Please see Figures 1-9 This application provides a multi-directional adjustable office chair with posture linkage, including a base 1. The base 1 is provided with a seat cushion 2 for supporting the user and a backrest 3 for leaning. The seat cushion 2 is rotated on the base 1 via a first pivot 21, and the backrest 3 is rotated on the base 1 via a second pivot 31. A reclining unit is provided between the base 1 and the backrest 3 for reclining the backrest 3, and a synchronous adjustment unit 4 is provided between the reclining unit and the seat cushion 2, wherein the synchronous adjustment unit 4 includes, A pushing component 42 is arranged between the base 1 and the cushion 2, and the pushing component 42 is connected to the reclining unit through a linkage component 41. A movable seat 44 is movably disposed on the top surface of the base 1, and a wedge block 43 is fixedly disposed on the movable seat 44 to cooperate with the pushing component 42. The pushing component 42 is used to push the wedge block 43 to move, and a movable block 45 is movably mounted on the top surface of the movable seat 44. At least two connecting rods 46 are provided to prevent discomfort to the user caused by the partial lifting of the seat cushion 2 during the synchronous adjustment of the seat. One end of the connecting rod 46 is hinged to the bottom surface of the seat cushion 2 through a first hinge seat 461, and the other end of the connecting rod 46 is hinged to the movable block 45 through a second hinge seat 462.

[0022] Specifically, when the user lies down to rest, the backrest 3 can be reclined around the second pivot 31 using the reclining unit. Through the linkage of the linkage component 41, the pushing component 42 can be driven to push the inclined side of the wedge block 43. Under the action of the squeezing force, the moving seat 44 is pushed to move on the top surface of the base 1, which in turn drives the connecting rod 46 on the movable block 45 to move and rotate. This causes the seat cushion 2 to rotate upward around the first pivot 21, so that the bottom surface of the seat cushion 2 can have a certain backward tilt angle, increasing the user's comfort when lying down, reducing the relative sliding between the buttocks and the seat surface, and avoiding the problem of muscle tension in the buttocks caused by the user having to resist the above-mentioned sliding. It can also be adjusted synchronously, reducing operation steps and providing a good experience for the user.

[0023] Furthermore, the reclining unit includes, The third rotating shaft 34 is rotatably mounted on one side of the base 1. A pawl 33 is fixedly mounted on the third rotating shaft 34. A grooved wheel 35 that is used in conjunction with the pawl 33 is mounted on the second rotating shaft 31. A torsion spring is provided between the pawl 33 and the base 1 to drive the pawl 33 to lock the grooved wheel 35 in both directions. The reset mechanism 32 is located on the second rotating shaft 31 at one end away from the grooved wheel 35. The reset mechanism 32 includes a fixed shell 321 fixedly installed on the other side of the base 1. A spiral spring 322 for driving the second rotating shaft 31 to reset is provided between the fixed shell 321 and the second rotating shaft 31. The claw 33 is provided with a first grip 331.

[0024] Specifically, in a normal sitting posture, the latch 33 can lock the groove wheel 35 in both directions, thereby restricting the backrest 3 from rotating backward around the second pivot 31, providing support for the user to lean against the backrest 3. When it is necessary to lie down and rest, the first handle 331 can be pulled to separate the latch 33 from the groove wheel 35. At this time, the second pivot 31 loses its limit, and the user can use their back to press the backrest 3 backward until the angle between the seat cushion 2 and the backrest 3 is adjusted. Releasing the first handle 331 allows the latch 33 to lock the groove wheel 35 again, thereby allowing the backrest 3 to be reclined and adjusted to a suitable angle. When it is necessary to reset the seat, the first handle 331 can be lifted to separate the latch 33 from the groove wheel 35. Under the action of the spiral spring 322, the second pivot 31 can be rotated in the opposite direction and reset, thereby resetting the backrest 3.

[0025] Furthermore, the linkage component 41 includes, The drive shaft 413 is rotatably connected to the base 1, and the drive shaft 413 is arranged in parallel with the second rotating shaft 31; Gear 411 is fixedly mounted on shaft 31, and gear 412, which meshes with gear 411, is fixedly mounted on shaft 413.

[0026] Furthermore, the pushing component 42 includes, Two worm gears 421 are provided, fixedly and symmetrically arranged on the drive shaft 413; Two worm gears 422 are rotatably mounted on the top surface of the base 1, and each worm gear 422 is meshed with a worm 421. Each worm gear 422 is fixedly connected to a fixing frame 423. A rotating wheel 424 is rotatably mounted on the end of the fixing frame 423 away from the worm gear 422, and the rotating wheel 424 is arranged in close contact with the wedge block 43. It should be explained that by setting the rotating wheel 424, the friction between the fixing frame 423 and the wedge block 43 can be reduced, avoiding noise caused by the fixing frame 423 directly contacting the wedge block 43.

[0027] Specifically, when the seat is reclined, it drives the first gear 411 on the second rotating shaft 31 to rotate. The first gear 411 drives the transmission shaft 413 to rotate through the second gear 412. The transmission shaft 413 then drives the second gear 412 on it to rotate. The second gear 412 drives the worm gear 422 meshing with it to rotate. The worm gear 422 drives the fixed frame 423 to rotate. The rotating wheel 424 at the end of the fixed frame 423 applies a thrust to the inclined surface of the wedge block 43, thereby driving the movable seat 44 to move. The movement of the movable seat 44 drives the connecting rod 46 on the movable block 45 to lift the front end of the seat and tilt it backward, thereby realizing the linkage adjustment of the seat cushion 2 and the backrest 3.

[0028] Furthermore, two slide rails 11 are provided on the top surface of the base 1, and the movable seat 44 is slidably disposed on the slide rails 11. A second reset spring is provided between each slide rail 11 and the movable seat 44 to drive the movable seat 44 to reset, which can assist the movable seat 44 in resetting during the process of resetting the backrest 3.

[0029] Example 2: Based on Embodiment 1, the movable seat 44 is further provided with a separate adjustment module 47, which includes, The screw drive rod 471 is rotatably mounted on the top surface of the movable seat 44; The inner spiral groove sleeve 475 is fixedly mounted on the movable block 45, and the inner spiral groove sleeve 475 is used in conjunction with the spiral drive rod 471. It should be noted that the spiral drive rod 471 is preferably made of aluminum-iron alloy, and it should be noted that the spiral drive rod 471 and the inner spiral groove sleeve 475 are only fitted with a spiral groove structure, similar to the groove of a reciprocating lead screw. By rotating the spiral drive rod 471, the movable block 45 is driven to move. A drive shaft 473 is rotatably mounted on the base 1 and is used to drive the screw transmission rod 471 to rotate. A knob 4731 is also provided on the drive shaft 473 to increase the contact area with the palm. An adaptive component 472 is also provided between the drive shaft 473 and the screw transmission rod 471. The second reset component is located on the top surface of the base 1 and is used to drive the movable block 45 to reset. The second limiting component 48 is mounted on the drive shaft 473 and is used to lock the rotation of the drive shaft 473 in one direction.

[0030] Specifically, rotating the knob 4731 drives the drive shaft 473 to rotate, which in turn drives the helical transmission rod 471 to rotate via the adaptive component 472. The rotation of the helical transmission rod 471 drives the movable block 45 to move relative to the movable seat 44, thereby forming an independent lower adjustment. The movable block 45 drives the connecting rod 46 to rotate, and the connecting rod 46 adjusts the angle of the seat cushion 2. The angle of the seat cushion 2 can be adjusted independently according to the user's own comfort without affecting the angle of the backrest 3, thus improving the comfort and flexibility of the seat.

[0031] Furthermore, the adaptive component 472 includes The slide rod 4721 is fixedly connected to the end of the screw drive rod 471, and a limit bar 4722 is fixedly provided on the outer wall of the slide rod 4721. Both the slide rod 4721 and the limit bar 4722 are slidably arranged on the inner side of the drive shaft 473.

[0032] Specifically, when the screw drive rod 471 is stationary and the angles of the backrest 3 and the seat cushion 2 are adjusted, the movable block 45 needs to move a certain distance along with the movable seat 44. Therefore, the slide rod 4721 can provide a buffer space so that neither individual adjustment nor linkage adjustment of the angle will be affected. The setting of the limit bar 4722 makes it easy for the slide rod 4721 to slide relative to the drive shaft 473, and also to be driven by the rotation of the drive shaft 473 to rotate together with the slide rod 4721, avoiding the mutual influence between individual adjustment and linkage adjustment of the angle, and ensuring that the positions of the drive shaft 473 and the knob 4731 do not change, allowing the user to quickly find the position of the knob 4731.

[0033] Furthermore, the second reset component includes, The guide shaft 476 is fixedly mounted on the top surface of the base 1. The guide shaft 476 is arranged in parallel with the screw drive rod 471, and the movable block 45 is slidably mounted on the guide shaft 476. A reset spring 4762 is sleeved on the outside of a guide shaft 476, and a limit block 4761 is provided at the end of the guide shaft 476. The two ends of the reset spring 4762 are fixedly connected to the limit block 4761 and the movable block 45, respectively.

[0034] Specifically, by setting the guide shaft 476, the movement direction of the movable block 45 can be restricted, and by setting the reset spring 4762, after the second limit component 48 releases the locking state of the drive shaft 473, the movable block 45 is immediately driven to reset, that is, the seat cushion 2 is quickly reset and adjusted to the initial state.

[0035] Furthermore, the second limiting component 48 includes, A fourth rotating shaft 481 is rotatably mounted on a base 1, and a second pawl 482 is fixedly connected to the fourth rotating shaft 481. A second ratchet 484, which is used in conjunction with the second pawl 482, is fixedly mounted on a drive shaft 473. A second torsion spring is provided between the fourth rotating shaft 481 and the base 1 to drive the second pawl 482 to lock the second ratchet 484 in one direction. A second grip 483 is fixedly mounted on the second pawl 482.

[0036] Specifically, when the second pawl 482 is unidirectionally jammed with the second ratchet 484, the screw drive rod 471 can be rotated by turning the knob 4731, thereby adjusting the recline angle of the seat cushion 2 independently. After separating the second pawl 482 from the second ratchet 484 by holding the second grip 483, the drive shaft 473 can be rotated in the opposite direction under the action of the reset component to reset the seat cushion 2. Example 3: Based on Embodiment 2, a lifting frame 5 is provided on the bottom surface of the base 1, and a caster wheel is provided at the bottom of the lifting frame 5. It should be noted again that the main structure of the lifting frame 5 is preferably a hydraulic cylinder structure, which can adjust the height of the chair.

[0037] The above embodiments are only used to illustrate the technical methods of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical methods of the present invention without departing from the spirit and scope of the technical methods of the present invention.

Claims

1. A multi-directional adjustment office chair with sitting linkage, comprising a base (1), a seat cushion (2) for bearing a user and a backrest (3) for leaning on the base (1), characterized in that: The seat cushion (2) rotates on the base (1) via a first pivot (21), and the backrest (3) rotates on the base (1) via a second pivot (31); A reclining unit is provided between the base (1) and the backrest (3) for reclining the backrest (3), and a synchronous adjustment unit (4) is provided between the reclining unit and the seat cushion (2), wherein the synchronous adjustment unit (4) includes, A pushing component (42) is arranged between the base (1) and the cushion (2), and the pushing component (42) is connected to the reclining unit via a linkage component (41); A movable seat (44) is movably disposed on the top surface of the base (1), and a wedge block (43) is fixedly disposed on the movable seat (44) to cooperate with the pushing component (42). The pushing component (42) is used to push the wedge block (43) to move, and a movable block (45) is movably installed on the top surface of the movable seat (44). One end of the connecting rod (46) is hinged to the bottom surface of the seat (2) through the first hinge seat (461), and the other end of the connecting rod (46) is hinged to the movable block (45) through the second hinge seat (462).

2. The sitting linkage multi-directional adjustment office chair according to claim 1, characterized in that, The reclining unit includes, The third rotating shaft (34) is rotatably mounted on one side of the base (1). A pawl (33) is fixedly mounted on the third rotating shaft (34). A grooved wheel (35) is mounted on the second rotating shaft (31) to be used in conjunction with the pawl (33). A first torsion spring is provided between the pawl (33) and the base (1) to drive the pawl (33) to lock the grooved wheel (35) in both directions. The reset mechanism (32) is located on the second rotating shaft (31) at one end away from the grooved wheel (35). The reset mechanism (32) includes a fixed shell (321) fixedly installed on the other side of the base (1). A spiral spring (322) for driving the second rotating shaft (31) to reset is provided between the fixed shell (321) and the second rotating shaft (31). A first grip (331) is provided on the claw (33).

3. The chair of claim 1, wherein: The linkage component (41) includes, The drive shaft (413) is rotatably connected to the base (1), and the drive shaft (413) is arranged in parallel with the second rotating shaft (31); The first gear (411) is fixedly mounted on the second rotating shaft (31), and the second gear (412) that meshes with the first gear (411) is fixedly mounted on the transmission shaft (413).

4. The chair of claim 1, wherein: The pushing component (42) includes, Two worm gears (421) are provided, fixed and symmetrically arranged on the drive shaft (413); Two worm gears (422) are rotatably mounted on the top surface of the base (1), and one worm gear (422) is meshed with a worm (421). Each worm gear (422) is fixedly connected to a fixing frame (423). A rotating wheel (424) is rotatably mounted on the end of the fixing frame (423) away from the worm gear (422), and the rotating wheel (424) is arranged in close contact with the wedge block (43).

5. The multi-directional adjustable office chair with posture linkage according to claim 1, characterized in that, The movable seat (44) is also provided with a separate adjustment module (47), the separate adjustment module (47) includes, The screw drive rod (471) is rotatably mounted on the top surface of the movable seat (44); An inner spiral groove sleeve (475) is fixedly mounted on the movable block (45), and the inner spiral groove sleeve (475) is used in conjunction with the spiral drive rod (471); A drive shaft (473) is rotatably mounted on a base (1) for driving the screw drive rod (471) to rotate. A knob (4731) is also provided on the drive shaft (473), and an adaptive component (472) is also provided between the drive shaft (473) and the screw drive rod (471). The second reset component is located on the top surface of the base (1) and is used to drive the movable block (45) to reset. The second limiting component (48) is disposed on the drive shaft (473) and is used to lock the rotation of the drive shaft (473) in one direction.

6. The multi-directional adjustable office chair with posture linkage according to claim 5, characterized in that, The adaptive component (472) includes A slide rod (4721) is fixedly connected to the end of a screw drive rod (471), and a limiting bar (4722) is fixedly provided on the outer wall of the slide rod (4721). Both the slide rod (4721) and the limiting bar (4722) are slidably arranged on the inner side of the drive shaft (473).

7. The multi-directional adjustable office chair with posture linkage according to claim 5, characterized in that, The second reset component includes, The guide shaft (476) is fixedly mounted on the top surface of the base (1). The guide shaft (476) is arranged in parallel with the screw drive rod (471), and the movable block (45) is slidably mounted on the guide shaft (476). A reset spring (4762) is sleeved on the outside of the guide shaft (476), and a limit block (4761) is provided at the end of the guide shaft (476). The two ends of the reset spring (4762) are fixedly connected to the limit block (4761) and the movable block (45) respectively.

8. The multi-directional adjustable office chair with posture linkage according to claim 5, characterized in that, The second limiting component (48) includes, The fourth rotating shaft (481) is rotatably mounted on the base (1), and the fourth rotating shaft (481) is fixedly connected to the second pawl (482). The drive shaft (473) is fixedly mounted with the second ratchet (484) that is used in conjunction with the second pawl (482). The fourth rotating shaft (481) and the base (1) are provided with a second torsion spring for driving the second pawl (482) to lock the second ratchet (484) in one direction. The second pawl (482) is fixedly mounted with a second handle (483).

9. The multi-directional adjustable office chair with posture linkage according to claim 1, characterized in that, The base (1) has two slide rails (11) on its top surface, and the movable seat (44) is slidably mounted on the slide rails (11). Each slide rail (11) and the movable seat (44) is provided with a second reset spring for driving the movable seat (44) to reset.

10. A multi-directional adjustable office chair with posture linkage according to claim 1, characterized in that, A lifting frame (5) is provided on the bottom surface of the base (1), and a caster wheel is provided at the bottom of the lifting frame (5).

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