TWI831690B - Adjustment device with switchable usage modes and chair with adjustment device - Google Patents

Abstract

An adjusting device with switchable usage modes and a chair with the adjusting device. The adjusting device includes a base unit, a bearing unit, a pivot unit and a turntable unit. The base unit has a positioning surface and an axis, the carrying unit has a supporting surface opposite to the positioning surface, and at least a pair of limiting protrusions, and the pivot unit provides the bearing unit with respect to the base unit. The turntable unit has at least one pair of first positioning blocks. When the turntable unit is operated to rotate relative to the base unit, the first positioning blocks can be switched between a contact state and a staggered state relative to the restriction bulges respectively. When the adjustment device is applied to a chair , a seat unit of the chair can be switched to different usage states relative to a foot unit.

Description

Adjustment device with switchable usage modes and chair with adjustment device

The present invention relates to a chair, in particular to an adjusting device that can switch usage modes and a chair with the adjusting device.

There is an existing seat back angle adjustment and positioning mechanism (Taiwan Patent No. M 590914), which includes a base, a seat, a seat back, and an adjustment locking unit. The base has a positioning tube, the bottom of the chair back is pivotally connected to the rear of the seat, and the side of the chair back is pivotally connected to the base frame. The adjustment locking unit has a movable rod, a control button, a control cable, and a locking device. The movable rod is located in a socket of the base. The movable rod has a plurality of first protrusions arranged continuously along the axial direction. teeth, and the front end of the movable rod is pivotally connected to the front of the seat. The control button is located on the base. One end of the control cable is connected to the control button. The locking device mainly has a locking block and an elastic member. The locking block has a plurality of second convex teeth that can engage with part of the first convex teeth. The locking block is linked and combined with the control cable. The elastic member provides the meshing elastic force of the first convex teeth and the second convex teeth.

With the above structure, the control button can be used to control locking or unlocking, and the angle of the chair back can be adjusted and positioned. However, the above structure is limited to providing chair back angle adjustment and cannot provide switching of the swing function in different directions.

Therefore, an object of the present invention is to provide an adjustment device with switchable usage modes that can solve the existing problems.

Another object of the present invention is to provide a chair with an adjustment device that can solve the existing problems.

Therefore, the adjustment device of the present invention can switch usage modes, including a base unit, a carrying unit, a pivot unit and a turntable unit. The base unit has a positioning surface and an axis intersecting the positioning surface. The carrying unit is disposed on one side of the base unit along the axis and has a supporting surface opposite to the positioning surface, and at least one For the limiting bumps protruding from the supporting surface, the limiting bumps are 180 degrees apart around the axis, the pivot unit is arranged between the base unit and the carrying unit along the axis, and provides the carrying unit The turntable unit swings relative to the base unit, and the turntable unit can rotate relative to the positioning surface of the base unit. The turntable unit has at least a pair of first positioning blocks, and the first positioning blocks are 180 degrees apart around the axis. Operation When the turntable unit rotates relative to the load-bearing unit with the axis as the center of rotation, the first positioning blocks can be switched between a resisting state and a staggered state relative to the restricting protrusions. In the staggered state, the first positioning blocks and the limiting protrusions respectively abut each other along an axial direction parallel to the axis. In the staggered state, the first positioning blocks and the limiting protrusions respectively revolve around the axis. Staggered.

The chair with an adjustment device of the present invention includes a foot unit, a pneumatic rod, an adjustment device and a seat unit. The air pressure rod is retractably installed on the foot unit and includes a trigger valve disposed on the top. The adjustment device is installed on the top of the pneumatic rod and includes a base unit, a carrying unit, a pivot unit and a turntable unit. The base unit has a positioning surface and an axis intersecting the positioning surface. The carrying unit is arranged on one side of the base unit along the axis, and has a supporting surface opposite to the positioning surface, and at least a pair of limiting convex blocks protruding from the supporting surface. The limiting convex blocks surround the supporting unit. The axes are 180 degrees apart. The pivot unit is arranged between the base unit and the carrying unit along the axis, and provides the carrying unit to swing relative to the base unit. The turntable unit is installed in the position of the base unit. On the surface, the turntable unit has at least a pair of first positioning blocks, and the first positioning blocks are 180 degrees apart around the axis. When the turntable unit is operated to rotate relative to the load-bearing unit with the axis as the rotation center, the first positioning blocks can be rotated relative to the bearing unit. The first positioning blocks are respectively switched between a resisting state and a staggered state relative to the restricting protrusions. In the resisting state, the first positioning blocks respectively and the restricting protrusions move along an axis parallel to the axis. The axial directions of the first positioning blocks are against each other, and in the staggered state, the first positioning blocks and the limiting convex blocks are respectively staggered around the axis. The seat unit is connected to the carrying unit.

The effect of the present invention is to utilize the arrangement of the adjustment device and operate the turntable unit to rotate relative to the bearing unit, so that the first positioning blocks are respectively in the abutment state and the staggered position relative to the restriction convex blocks. The function of switching between states allows the seat unit to be switched between a locked state or a swing state to meet different usage needs.

Referring to FIGS. 1 to 3 , an embodiment of a chair with an adjustment device according to the present invention includes a foot unit 1 , a pneumatic rod 2 , an adjustment device 3 and a seat unit 4 .

Referring to Figure 5, the pneumatic rod 2 extends along an axis L and includes a cylinder component 201 installed on the foot unit 1, a telescopic inner pipe component 202 installed on the cylinder component 201, and a cylinder component 202 connected to the cylinder. There is a piston member 203 between the member 201 and the inner pipe member 202, and a trigger valve 204 provided on the top of the inner pipe member 202. The operation of the pneumatic rod 2 is a prior art and will not be described further.

With reference to Figures 2, 4 to 7, the adjustment device 3 is installed on the top of the inner pipe 202, and includes a base unit 10, a bearing unit 20, a pivot unit 30, a turntable unit 40 and a buffer unit 50.

The base unit 10 includes a covering member 11 and a positioning plate 12 fixed on the covering member 11 . The covering member 11 has a lower shell seat 13 , an upper shell seat 14 arranged above the lower shell seat 13 , and a support seat 15 installed inside the lower shell seat 13 . The lower housing 13 has a peripheral wall 132 that defines a receiving groove 131 . The peripheral wall 132 defines a through groove 133 and a plurality of operating grooves 134 interconnected with the through groove 133 . The positioning plate 12 is locked to the support base 15. The positioning plate 12 has a positioning surface 121 intersecting the axis L, a bottom end surface 122 along the axis L opposite to the positioning surface 121, and a bottom end surface 122 corresponding to the axis L and The lower pivot seat 123 protrudes from the positioning surface 121, an annular groove 124 is formed around the outside of the lower pivot seat 123 and around the axis L, and two connecting the positioning surface 121 and the bottom end surface 122 and surrounding the axis L The generated arc groove 125, four positioning posts 126 arranged outside the ring groove 124, and several inverted L-shaped guide blocks 127 adjacent to the ring groove 124. The arc grooves 125 are arranged concentrically, and one of the arc grooves 125 is connected to the annular groove 124 . The upper shell seat 14 is fixed to the seat unit 4 , and when the seat unit 4 swings relative to the base unit 10 , the upper shell seat 14 can rotate relative to the lower shell seat 13 . In addition, the positioning plate 12 also has two stoppers 128 protruding from the positioning surface 121 , and the stoppers 128 are spaced 180 degrees around the axis L.

The carrying unit 20 is disposed on one side of the base unit 10 along the axis L, and includes a fixed plate 21 , an upper pivot base 22 fixed to the fixed plate 21 , and a bearing surrounding the upper pivot base 22 . Plate 23. The supporting plate 23 has a supporting surface 231 opposite to the positioning surface 121 , two pairs of limiting protrusions 232 and 233 protruding from the supporting surface 231 , and four countersunk holes 234 recessed from the supporting surface 231 . , and two restriction blocks 235 corresponding to the stop blocks 128 respectively. Each pair of limiting protrusions 232 and 233 are spaced 180 degrees around the axis L, and two adjacent limiting protrusions 232 and 233 are spaced 90 degrees around the axis L. Each limiting protrusion 232 has a planar resisting surface 232', and each limiting protrusion 233 has a planar resisting surface 233'.

The pivot unit 30 is disposed between the base unit 10 and the carrying unit 20 along the axis L, and provides the carrying unit 20 to swing relative to the base unit 10 . The pivot unit 30 of this embodiment includes a shaft base 31, a first pivot shaft 32 that is pivotally connected to the shaft base 31 and the lower pivot base 123 and extends along a first centerline L1 perpendicular to the axis L, and A second pivot 33 is pivotally connected to the axis seat 31 and the upper pivot seat 22 and extends along a second centerline L2 perpendicular to the axis L and the first centerline L1.

The turntable unit 40 includes a turntable component 401 , a connecting base 402 connected to the turntable component 401 , and a control lever 403 connected to the connecting base 402 . The turntable component 401 is rotatably installed on the positioning surface 121 of the base unit 10. The turntable component 401 has a ring seat 41 rotatably sleeved in the ring groove 124, and two pairs of rings connected to the ring seat 41. The first positioning block 42 , a pair of second positioning blocks 43 connected to the ring base 41 , and a pair of third positioning blocks 44 connected to the ring base 41 . The ring seat 41 is in the shape of a hollow ring and has an inner ring surface 411, an outer ring surface 412 opposite to the inner ring surface 411, and a plurality of guides protruding from the inner ring surface 411 and spaced around the axis L. The rib 413, and an extension 414 protruding outward from the outer ring surface 412, form a gap 415 between two adjacent guide ribs 413 for the corresponding guide block 127 to pass through, and these gaps 415 are used to insert the rib 413. Insert the guide blocks 127, slightly rotate the turntable component 401, and when the notches 415 are staggered with the guide blocks 127, the turntable component 401 can be rotatably limited to the positioning plate 12. Two adjacent first positioning blocks 42 are 90 degrees apart around the axis L. Each first positioning block 42 has a first arc surface 421 that can be arched relative to the resisting surfaces 232', 233'. . The second positioning blocks 43 are angularly spaced from the two adjacent first positioning blocks 42 around the axis L, and each second positioning block 43 is angularly spaced from the two adjacent first positioning blocks 42 54 degrees and 36 degrees, the second positioning blocks 43 are 180 degrees apart, and each second positioning block 43 has an arched second arc surface 431 relative to the resisting surfaces 232', 233'. . The third positioning blocks 44 are respectively angularly spaced from the two adjacent first positioning blocks 42 around the axis L, and each third positioning block 44 is angularly spaced from the two adjacent first positioning blocks 42 . 54 degrees and 36 degrees, and the third positioning blocks 44 are 180 degrees apart. Each third positioning block 44 has a third arc surface 441 that is arched relative to the resisting surfaces 232' and 233'.

The connecting seat 402 is locked to the extension part 414 and has a mounting hole 404 and two guide rods 405 that can slide along the arc grooves 125 respectively.

The control lever 403 is pivotally connected to the connecting base 402 and passes through the mounting hole 404 and the through groove 133 . The control lever 403 has an operating end 406 located outside the covering member 11 , and an inner end 407 opposite to the operating end 406 and extending above the trigger valve 204 . Utilizing the arrangement of the operating grooves 134, the control lever 403 can be pulled upward.

The buffer unit 50 includes a plurality of elastic members 51 disposed between the load-bearing unit 20 and the base unit 10. In this embodiment, the elastic members 51 are compression springs, and each elastic member 51 is sleeved at opposite ends. Disposed in the corresponding positioning posts 126 and the corresponding countersunk holes 234 , the elastic force of the elastic members 51 always tends to keep the carrying unit 20 away from the base unit 10 .

The seat unit 4 is locked to the fixing plate 21 of the carrying unit 20 .

In order to further understand the functions of the various components of the present invention, the technical means used, and the expected effects, they will be further described below. I believe that this will provide a more in-depth and specific understanding of the present invention.

As shown in Figures 1, 5, and 6, and with reference to Figure 4, when the chair with the adjustment device 3 of the present invention is completely assembled, the support base 15 is used to fix the top of the inner pipe 202, and the positioning plate 12 The support base 15 is fixed to the lower shell base 13. The pivot unit 30 is pivoted between the base unit 10 and the load-bearing unit 20, and the bearing plate 23 and the positioning plate 12 are arranged oppositely. The limiting protrusions 232 and 233 can also abut against the first positioning blocks 42 , the second positioning blocks 43 and the third positioning blocks 44 respectively.

Each usage method of the present invention will be described below with reference to the drawings:

As shown in FIGS. 8 and 9 , and with reference to FIGS. 1 , 2 and 5 , it is shown that the turntable unit 40 is in a locked state relative to the carrying unit 20 . At this time, the first positioning blocks 42 respectively abut against each other. In the restricting protrusions 232 and 233 , the first positioning blocks 42 are respectively in a resisting state relative to the restricting protrusions 232 and 233 , and the seat unit 4 locked with the carrying unit 20 cannot be relative to the restricting protrusions 232 and 233 . The base unit 10 and the foot unit 1 swing. And the control lever 403 corresponds to an operating groove 134 on the far left side of Figure 8, and in the locked state, the operator pulls the operating end 406 of the control lever 403 upward to make the inner end 407 of the control lever 403 By pressing the trigger valve 204 of the pneumatic rod 2, the height of the seat unit 4 can be adjusted.

As shown in Figures 10 and 11, and with reference to Figures 1, 2, and 5, when the operator pushes the joystick 403 toward the right side of Figure 9, and makes the joystick 403 correspond to the first position from left to right. When the two operating grooves 134 are operated, the control rod 403 links the turntable unit 40 through the connecting seat 402 to rotate with the axis L as the rotation center, so that the first positioning blocks 42 can be connected with the limiting convex blocks 232 and 232 respectively. 233 is staggered around the axis L and is in a staggered state. At this time, when the user sits on the seat unit 4, the carrying unit 20 can be linked to a freely swinging state relative to the turntable unit 40. At this time, the first arc surfaces 421 of the first positioning blocks 42 can be used to make the swinging action of the seat unit 4 quite smooth.

As shown in Figures 12 and 13, and with reference to Figures 1, 2 and 5, when the operator pushes the joystick 403 toward the right side of Figure 12, and makes the joystick 403 correspond to the direction from left to right. When the third operating groove 134 is operated, the control lever 403 links the turntable unit 40 to rotate with the axis L as the rotation center through the connecting seat 402, and makes the first positioning blocks 42 respectively relative to the limiting convex blocks. 232 and 233 are in a staggered state, and the second positioning blocks 43 are respectively in abutting state with respect to the corresponding pair of limiting protrusions 233 . At this time, when the user sits on the seat unit 4, the carrying unit 20 can be linked to a left-right swing state relative to the turntable unit 40. At this time, the second arc surfaces 431 of the second positioning blocks 43 can be used to make the swinging action of the seat unit 4 quite smooth.

As shown in Figures 14 and 15, and with reference to Figures 1, 2 and 5, when the operator pushes the joystick 403 toward the right side of Figure 14, and makes the joystick 403 correspond to the rightmost position in Figure 14 When operating the groove 134, the control lever 403 links the turntable unit 40 to rotate with the axis L as the rotation center through the connecting seat 402, and makes the first positioning blocks 42 and the second positioning blocks 43 face each other respectively. When the limiting protrusions 232 and 233 are in the staggered state, the third positioning blocks 44 are respectively in abutting state with respect to the corresponding pair of limiting protrusions 232 . At this time, when the user sits on the seat unit 4, the carrying unit 20 can be linked to a forward and backward swinging state relative to the turntable unit 40. At this time, the third arc surfaces 441 of the third positioning blocks 44 can be used to make the swinging action of the seat unit 4 quite smooth. Furthermore, the cooperation between the stoppers 128 and the restricting blocks 235 can prevent the back and forth swinging angle from being too large and causing danger.

Therefore, by operating the control lever 403, the turntable member 401 can be driven to rotate, and the first positioning blocks 42, the second positioning blocks 43 and the third positioning blocks 44 can be positioned relative to the limiting convex blocks respectively. 232, 233 can be switched between the abutment state and the staggered state to achieve the purpose of switching the use mode of the seat unit 4.

It is worth mentioning that the control lever 403 of the present invention can not only be pulled to rotate the turntable member 401, but also has the function of controlling the expansion and contraction of the pneumatic rod 2, which can simplify the parts and make the manufacturing and assembly easier. for easy.

To sum up, the chair with the adjustment device of the present invention can switch the usage mode in a timely manner according to the usage requirements, and can indeed achieve the purpose of the present invention.

However, the above are only examples of the present invention. They cannot be used to limit the scope of the present invention. All simple equivalent changes and modifications made based on the patent scope of the present invention and the contents of the patent specification are still within the scope of the present invention. within the scope covered by the patent of this invention.

1: Foot unit 2: Air pressure rod 201:Cylinder parts 202:Inner pipe fittings 203:Piston parts 204: Trigger valve 3: Adjustment device 10: Base unit 11: Covering parts 12: Positioning plate 121: Positioning surface 122: Bottom end surface 123:Lower pivot seat 124: Ring groove 125: Arc groove 126: Positioning column 127: Guide block 128:Block 13: Lower shell seat 131:Tank 132: Surrounding wall 133:Through groove 134: Operating groove 14: Upper shell seat 15: Support base 20: Bearing unit 21:Fixed plate 22: Upper pivot seat 23:Bearing plate 231:Resisting surface 232:Limit bump 232’:stop surface 233:Limit bump 233’:stop surface 234: Counterbore 235: Restriction block 30: Pivot unit 31:Shaft seat 32:First pivot 33: Second pivot 40:Turntable unit 401: Turntable parts 41: Ring seat 411:Inner ring surface 412: Outer ring surface 413: Guide rib 414:Extension 415: Gap 42: First positioning block 421: First arc surface 43: Second positioning block 431: Second arc surface 44: The third positioning block 441:Third arc surface 402: Connector 403: Joystick 404:Mounting hole 405: Guide rod 406: Operation end 407:Inside end 50: Buffer unit 51: Elastic parts 4: Seat unit L: axis L1: first center line L2: Second center line

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: Figure 1 is a perspective view of an embodiment of a chair with an adjustment device according to the present invention; Figure 2 is a schematic bottom perspective view of this embodiment; Figure 3 is an exploded perspective view of this embodiment; Figure 4 is a partially exploded perspective view of this embodiment; Figure 5 is a schematic cross-sectional view of this embodiment; Figure 6 is a partially enlarged cross-sectional schematic view of Figure 5; Figure 7 is a cross-sectional view along line VII-VII in Figure 6; Figure 8 is a three-dimensional schematic view of this embodiment, illustrating that a turntable unit is in a locked state relative to a carrying unit; Figure 9 is a schematic top view of Figure 8 , illustrating that the two pairs of first positioning blocks of the turntable unit are respectively abutted against the two pairs of limiting convex blocks of the carrying unit; Figure 10 is another three-dimensional schematic view of this embodiment, illustrating that the carrying unit is in a freely swinging state relative to the turntable unit; Figure 11 is a schematic top view of Figure 10 , illustrating that the first positioning of the turntable unit is staggered with the limiting bumps of the carrying unit; Figure 12 is another three-dimensional schematic view of this embodiment, illustrating that the carrying unit can swing left and right relative to the turntable unit; Figure 13 is a schematic top view of Figure 12 , illustrating that a pair of second positioning blocks of the turntable unit respectively abut against a pair of limiting convex blocks of the carrying unit; Figure 14 is another three-dimensional schematic view of this embodiment, illustrating that the carrying unit can be in a forward and backward swinging state relative to the turntable unit; and FIG. 15 is a schematic top view of FIG. 14 , illustrating that a pair of third positions of the turntable unit are respectively abutted against a pair of limiting protrusions of the carrying unit.

2: Air pressure rod

201:Cylinder parts

202:Inner pipe fittings

204: Trigger valve

3: Adjustment device

10: Base unit

11: Covering parts

12: Positioning plate

13: Lower shell seat

14: Upper shell seat

15: Support base

20: Bearing unit

21:Fixed plate

22: Upper pivot seat

23:Bearing plate

232:Limit bump

233:Limit bump

30: Pivot unit

31:Shaft seat

32:First pivot

33: Second pivot

40:Turntable unit

401: Turntable parts

402: Connector

403: Joystick

404:Mounting hole

405: Guide rod

406: Operation end

407:Inside end

50: Buffer unit

51: Elastic parts

Claims (10)

An adjustment device with switchable usage modes, including: A base unit having a positioning surface and an axis intersecting the positioning surface; A carrying unit is provided on one side of the base unit along the axis, and has a supporting surface opposite to the positioning surface, and at least a pair of limiting protrusions protruding from the supporting surface. The limiting protrusions 180 degrees apart around this axis; A pivot unit is disposed between the base unit and the carrying unit along the axis, and provides the carrying unit to swing relative to the base unit; and A turntable unit can rotate relative to the positioning surface of the base unit. The turntable unit has at least a pair of first positioning blocks. The first positioning blocks are 180 degrees apart around the axis. The turntable unit is operated to rotate on the axis. When the center rotates relative to the bearing unit, the first positioning blocks can be switched between a resisting state and a staggered state respectively relative to the limiting convex blocks. In the resisting state, the first positioning blocks The blocks respectively abut against each other along an axial direction parallel to the axis and the limiting protrusions. In the staggered state, the first positioning blocks and the limiting protrusions are respectively staggered around the axis. The adjustment device with switchable use modes as described in claim 1, wherein the number of limiting convex blocks of the carrying unit is two pairs, and two adjacent limiting convex blocks are 90 degrees apart around the axis, and the first of the turntable unit There are two pairs of positioning blocks, and two adjacent first positioning blocks are 90 degrees apart around the axis. The adjustment device with switchable usage modes as described in claim 2, wherein the turntable unit further includes a pair of second positioning blocks, and the second positioning blocks are angularly spaced from the adjacent first positioning blocks around the axis. , the second positioning blocks are 180 degrees apart, and the turntable unit is operated to rotate relative to the load-bearing unit with the axis as the center of rotation, so that the first positioning blocks and the second positioning blocks can be in abutting state and staggered Switching between states, when the second positioning blocks are respectively in abutting state with respect to the corresponding pair of limiting protrusions, the first positioning blocks are in a staggered state with respect to the limiting protrusions respectively. The adjustment device with switchable usage modes as described in claim 3, wherein the turntable unit further includes a pair of third positioning blocks, and the third positioning blocks are angularly spaced from the adjacent first positioning blocks around the axis. , the third positioning blocks are 180 degrees apart, and the turntable unit is operated to rotate relative to the bearing unit with the axis as the center of rotation, so that the first positioning blocks, the second positioning blocks and the third positioning blocks can be aligned with each other. The blocks are switched between the abutting state and the staggered state. When the third positioning blocks are respectively in the abutting state with respect to the corresponding pair of limiting convex blocks, the first positioning blocks and the second positioning blocks are respectively The bumps are in a staggered state relative to the limiting bumps. The adjustment device with switchable use modes as described in claim 4, wherein each limiting convex block of the carrying unit has a planar resisting surface, and each first positioning block of the turntable unit has a relatively opposite On the resisting surface and an arched first arc surface, each second positioning block has a second arched arc surface relative to the resisting surface, and each third positioning block has a A third arcuate surface that is arched relative to the resisting surface. The adjustment device with switchable usage modes as claimed in claim 4, wherein the base unit includes a covering member and a positioning plate fixed on the covering member, and the covering member has a receiving slot that can be defined The peripheral wall is provided with a through groove, the positioning surface is provided on the positioning plate, and the positioning plate also has two arc grooves generated around the axis, and the arc grooves are concentrically arranged. The turntable unit includes a turntable member , a connecting seat connected to the turntable component, and a control lever connected to the connecting seat, the first positioning blocks are provided on the turntable component, and the connecting seat has two guide rods that can slide along the arc grooves respectively , the control lever has an operating end located outside the covering member. Pulling the control lever can rotate the turntable component and make the first positioning blocks, the second positioning blocks and the third positioning blocks Switch between the abutting state and the staggered state with respect to the limiting convex blocks respectively. The adjustment device with switchable usage modes as described in claim 6, wherein the positioning plate also has an annular groove generated around the axis, one of the arc grooves is connected to the annular groove, and the turntable member of the turntable unit is hollow. Ring-shaped, and rotatably set in the ring groove. The adjustment device with switchable use modes as described in claim 4 also includes a buffer unit, which includes a plurality of elastic members disposed between the load-bearing unit and the base unit. The elastic force of these elastic members keeps the The carrying unit tends to move away from the base unit. The adjustment device with switchable use modes as claimed in claim 1, wherein the pivot unit includes an axis seat, a pivot axis connected to the axis seat and the base unit and extending along a first centerline perpendicular to the axis. a first pivot axis, and a second pivot axis pivotally connected to the axis seat and the bearing unit and extending along a second centerline perpendicular to the axis and the first centerline. A chair with an adjustment device, comprising: one-leg unit; A pneumatic rod is retractably installed on the foot unit and includes a trigger valve arranged on the top; An adjustment device is installed on the top of the pneumatic rod and includes a base unit, a bearing unit, a pivot unit and a turntable unit. The base unit has a positioning surface and an axis intersecting the positioning surface. The carrying unit is disposed on one side of the base unit along the axis, and has a supporting surface opposite to the positioning surface, and at least a pair of limiting protrusions protruding from the supporting surface. The limiting protrusions surround The axes are 180 degrees apart. The pivot unit is disposed between the base unit and the carrying unit along the axis and provides the carrying unit to swing relative to the base unit. The turntable unit is installed on the base unit. Positioning surface, the turntable unit has at least a pair of first positioning blocks, and the first positioning blocks are 180 degrees apart around the axis. When the turntable unit is operated to rotate relative to the base unit with the axis as the rotation center, the turntable unit can be rotated relative to the base unit. The first positioning blocks are respectively switched between a resisting state and a staggered state relative to the limiting protrusions. In the resisting state, the first positioning blocks are respectively aligned with the limiting protrusions along an edge parallel to the The axial directions of the axis abut each other, and in the staggered state, the first positioning blocks and the restricting protrusions are respectively staggered around the axis; and A seat unit is connected to the carrying unit.