JP2021065415A - Chair - Google Patents

Abstract

To retain high operability while improving an aesthetic appearance by suppressing a lever from being exposed to an observation as much as possible.SOLUTION: A seat receiver 2 comprises right and left arm parts 18, and a seat 3 is fixed to upper edges of the arm parts 18. Slender levers 25 are disposed in long grooves 27 formed on the inner surfaces of the arm parts 18. Spindles 35 formed in the levers 25 are rotatably held by bearing caps 36 fixed with screws on the arm parts 18. When finger rest parts 28 of the levers 25 are pushed from the outside, the levers 25 are rotated with the spindles 35 as fulcrums, and operation bodies 26 are pushed so as to push a push valve 24 down. Since the bearing caps 36 and the operation bodies 26 are covered with a cover 39, a neat exterior appearance is presented as the whole even when there is a space between the seat 3 and the seat receiver 2.SELECTED DRAWING: Figure 6

Description

The present invention relates to a chair using a gas cylinder as a leg strut.

There is a stool type chair as a chair with a simple structure that is easy to carry, and in this stool type chair, the leg support is composed of a gas cylinder and the circular seat is configured so that the height can be adjusted. It is disclosed. In Patent Document 1, a leg strut made of a gas cylinder is attached to a base grounded on the floor so as to tilt against the resistance of an elastic body. That is, in Patent Document 1, the base is stationary on the floor and the leg struts are tilted in an arbitrary direction in the used state.

Further, in Patent Document 1, the elevating operation device for adjusting the height of the seat includes a ring portion on which the seated person hangs a finger, a pressing operation portion connected to the ring portion via a connecting arm portion, and a pressing operation portion. It is equipped with a push operation part attached to the ring part, and when you put your finger on any part of the ring part and pull it upward, the pressing operation part and the push operation part tilt, and the push operation part locks the gas cylinder. The release member is pushed.

The chair of Patent Document 1 does not have a backrest and has a circular seat and base, and therefore has no direction when used by a person. Therefore, a ring portion is adopted as an elevating operation member for unlocking the gas cylinder so that the height of the seat can be adjusted in any usage mode.

JP-A-2017-86340

It can be said that it is rational to use a ring portion as an elevating operation member as in Patent Document 1 in a chair whose usage mode is not directional, but since the ring portion can be seen from the outside over the entire circumference. However, there is a problem that it is not always excellent in terms of aesthetics.

Furthermore, in a configuration in which a hand is placed somewhere on the ring portion and pulled upward, a certain distance must be provided between the lower surface of the seat and the ring portion in order to secure a pulling allowance for the ring portion. However, if you do so, the ring part will become more noticeable and the simplicity will be lost.

Also, if you put your finger somewhere on the ring and pull it up, a phenomenon will occur in which the part on the opposite side of the ring part will drop significantly, so the rotating state of the ring part will be visible to the public. There was also an aesthetic problem in this respect. As a known example, there is a case in which a pair of left and right levers are integrally connected, but in this case as well, when one lever is pulled up, the other lever is lowered and exposed to the public, so that the same aesthetic problem as the ring part is a problem. Appears.

The present invention has been made in view of such a situation, and an object of the present invention is to provide a chair having improved design without impairing operability.

The present invention includes various structures, and a typical example thereof is specified in each claim. Of these, the invention of claim 1 forms a superordinate concept.
"An elevating operation device provided with a stretchable leg support made of a gas cylinder and a seat supported by the leg support via a seat support, and the seat support is operated by a occupant to unlock the gas cylinder. Is placed "
In the basic configuration
"The elevating operation device includes a plurality of levers that are independently arranged apart from each other in the circumferential direction, and an operating body that releases the lock of the gas cylinder in an unlocked posture by operating the levers by a seated person. Each of the levers has an elongated shape extending in a direction intersecting the axis of the gas cylinder in a plan view. "
The feature is added.

The invention of claim 2 embodies the invention of claim 1.
"The seat holder includes a lower ring portion fixed to the upper end portion of a movable portion of the gas cylinder, an upper ring portion to which the seat is fixed, and a plurality of arm portions connected to the upper and lower ring portions. The arm portion is inclined so as to move away from the axis of the gas cylinder as it goes upward.
While the lever is arranged inside each arm portion so as to rotate by pushing or pulling a finger pad provided at the upper end portion of the lever.
Each arm of the seat holder has a relief hole for allowing the operation of the finger rest of the lever. "
It is configured as.

In claim 2, the finger rest portion of the lever may protrude outward from the relief hole, or the finger rest portion may be contained inside the relief hole. Alternatively, the finger pad portion may not be in the relief hole, and the finger tip may be inserted into the relief hole to push the finger pad portion.

The invention of claim 3 embodies the invention of claim 2.
"A long groove long in the longitudinal direction is formed on the inner surface of each of the arm portions, and when the lever pushes the finger contact portion from the outside in the long groove, the middle portion between the upper end and the lower end becomes a fulcrum. It is arranged to rotate. "
It is configured as.

The invention of claim 4 embodies the invention of claim 3.
"Each lever has a support shaft that serves as a rotation fulcrum, and the support shaft is rotatably held by a bearing cap that is stacked and fixed to the arm portion from above.
In addition, a cover covering each of the bearing caps and the operating body is arranged on the arm portion. "
It is configured as.

Further, the invention of claim 5 is in any one of claims 1 to 4.
"One or both of the operating body and the lever are formed with a relative motion regulating portion that prevents the operating body and the lever from being displaced in the horizontal direction."
It is configured as.

In the present invention, since the lever has an elongated shape, it is less noticeable than the ring portion of Patent Document 1, and since each lever is independent of each other, the phenomenon that the other lever is exposed to the public by operating one lever does not occur. Does not occur. The combination of the form of these levers and their independence can improve the aesthetic appearance. Further, since a plurality of levers are arranged apart from each other in the circumferential direction, the chair can be easily operated even if the chair is used in a posture with little or no directionality.

When the configuration of claim 2 is adopted, since the lever is hidden inside the arm portion, it is possible to prevent or greatly suppress the lever from coming into contact with the public. Therefore, the effect of improving the aesthetic appearance can be ensured. Further, in claim 2, since the arm portion has a relief hole, even if the lever is arranged inside the arm portion, there is no problem in operating the lever. Therefore, the aesthetic appearance can be improved without impairing the operability of the lever. Placing the lever in the long groove of the arm portion as in claim 3 is particularly preferable because the visibility of the lever can be further reduced.

For example, if the lever is connected to the arm portion by a pin, a hole for inserting the pin is formed on the side surface of the arm portion, which may deteriorate the aesthetic appearance. However, when the configuration of claim 4 is adopted, the lever is rotatably held. Since the bearing cap is covered with a cover, the aesthetic appearance is not deteriorated by holding the lever rotatably.

Further, since the operating body is also hidden by the cover, even if there is a large space under the seat, there is no problem that the operating body is exposed to the human eye and deteriorates the aesthetic appearance. It is also possible to integrate the bearing cap with the cover, and in this case, there is an advantage that the number of members can be suppressed and the cost can be reduced.

When having a plurality of levers, it is necessary to have an actuator that pushes the lock member of the gas cylinder in conjunction with the movement of the lever so that the lock of the gas cylinder is released regardless of which lever is operated. However, if slippage occurs between the lever and the operating body, the movement of the operating body may become incomplete, and the gas cylinder may not be unlocked even if the lever is operated.

On the other hand, when the configuration of claim 5 is adopted, the positional relationship between each lever and the operating body is maintained substantially constant, so that the movement of the lever can be accurately transmitted to the operating body and the operating body can be moved significantly. it can. Therefore, the unlocking of the gas cylinder can be ensured.

In the figure which shows the embodiment, (A) is a perspective view seen from above, (B) is a side view, (C) is a perspective view seen from below, and (D) is a separated perspective view seen from below. (A) is a separated perspective view seen from above, and (B) is a separated side view. It is a separated perspective view of a main part. (A) is a downward perspective view of the elevating operation device, and (B) is a downward separated perspective view of the elevating operation device. (A) is a partially separated upper perspective view of the elevating operation device, and (B) is a separated upper perspective view of the elevating operation device. (A) is a sectional view taken along line VI-VI of FIG. 1 (A), and (B) is a perspective view of the upper end of the leg support. (A) is a vertical sectional front view in an unlocked state, and (B) is a sectional view taken along line VIIB-VIIB of FIG. 1 (A).

(1). Basic structure Next, an embodiment of the present invention will be described with reference to the drawings. The chair is a stool type, and as shown in FIGS. 1 and 2, has a leg support 1 constituting the leg device and a seat 3 fixed to the upper end thereof via a seat support 2. The leg support 1 is composed of a gas cylinder in which the outer cylinder 4 and the inner cylinder 5 are fitted to each other in an expandable manner. In the present embodiment, the lower end portion of the outer cylinder 4 is fixed to the base 6 and the inner cylinder 5 is formed. The upper end of the seat is fixed to the seat holder 2. The seat 3 and the base 6 are rounded squares in a plan view.

The base 6 includes a base body 7 to which the lower end of the outer cylinder 4 of the gas cylinder is fitted, a grounding body 8 that overlaps the base body 7 from below, and a base cover 9 that overlaps the base body 7 from above. The three cylinders are integrally fixed (co-tightened) to the base cover 9 by screws screwed from below. As shown in FIG. 2, the lower protection cylinder 10 is integrally formed on the base cover 9, while the upper protection cylinder 11 slidably fitted to the lower protection cylinder 10 from the outside is fixed to the seat holder 2. ing.

The base 6 has a thick cushion-like shape, and the upper surface of the base cover 9 has a curved surface whose height increases toward the axis, while the lower surface (bottom surface) of the ground contact body 8 increases toward the axis. It is a curved surface with a low height. Therefore, the chair can be tilted (swinged) in any direction at a certain angle. The seat 3 and the base 6 are rounded squares in a plan view.

As shown in FIG. 1C, on the lower surface (bottom surface) of the ground contact body 8, a center recess 12a located at the center thereof, a large number of annular grooves 12b formed around the center recess 12a, and a second annular groove are formed. A large number of radial grooves 12c extending radially from 12b are formed. Therefore, the grounding surface of the grounding body 8 is composed of two annular grounding surfaces 13a located at the center and a large number of square grounding surfaces 13b partitioned by the annular groove 12b and the radiation groove 12c. Further, at the end of the four radiation grooves 12c, a screw hole 13c through which a screw for fastening the ground body 8, the base body 7 and the base cover 9 is inserted is formed.

By the way, since the lower surface of the ground contact body 8 is a curved convex surface, it can be swiveled horizontally or tilted (swinged) in an arbitrary direction, but there are two annular ground contact surfaces 13a in the central portion. Therefore, it is possible to easily make a horizontal turn in an almost upright posture with almost no resistance. Therefore, there is no resistance to changing the direction of the body while the person is seated to rotate the base 6 horizontally, or to rotate the base 6 horizontally while grounding the base 6 on the floor before sitting down to set the posture of the seat 3. Easy to do.

On the other hand, when the tilt angle becomes larger than a certain level, the edge of the square ground contact surface 13b hits the floor surface and the resistance with the floor surface increases (the grip on the floor surface increases), so that the resistance to horizontal turning increases. Because of the increase, the base 6 tends to turn horizontally when the person swings while sitting, and the posture of the seated person becomes unstable, and the person sits on the seat 3 in the posture in which the leg support 1 is tilted. It is possible to prevent a problem that the base 6 rotates around the axis of the pedestal 1 and rolls around a person when the base 6 is held by hand and touches the floor surface.

Further, since the screw hole 13c for fastening the ground body 8, the base body 7 and the base cover 9 together is formed in the radiation groove 12c, care is taken so that the head of the screw does not hit the floor and damage the floor. ing. The screw hole 13c may be formed in the annular groove 12b.

As is clearly shown in FIGS. 1 (D) and 2 (A), the seat support 2 includes a lower ring portion 14 to which the upper end portion of the inner cylinder 5 of the gas cylinder is fitted from the outside, and an inner shell (seat plate) 15. An upper ring portion 17 to which the outer shell 16 is attached and a pair of arm portions 18 connecting the two are provided, and as shown in FIG. 6, a cushion material 19 is superposed on the upper surface of the inner shell 15.

The inner shell 15 and the outer shell 16 are fixed with screws. Further, the upper ring portion 17, the inner shell 15, and the outer shell 16 are fastened together with other screws. As shown in FIG. 7, an upper narrowed tapered bush 20 is fitted into the lower ring portion 14 of the seat holder 2 by insert molding, and the upper end portion (tapered portion) of the inner cylinder 5 in the gas cylinder is the bush 20. It is fitted from below.

As shown in FIG. 6, the cushion material 19 is covered from above with a skin material 21 such as a cloth, and the outer peripheral edge portion of the skin material 21 is fixed to the lower surface of the outer peripheral edge portion of the inner shell 15 by a tacker. .. In this case, as shown in FIG. 6, an annular space 22 is formed between the outer peripheral portion of the outer shell 16 and the outer peripheral portion of the inner shell 15, and the annular space 22 is fixed to the inner shell 15 by a tacker. The edge of the skin material 21 is housed.

As described above, the seat 3 is formed in a rounded square, but as shown in FIGS. 1 (A) and 2 (A), the seat 3 has a handle hole into which a person can insert a hand. 23 is formed. The handle hole 23 is a long hole that is long in a direction parallel to the pair of sides forming the outer shape of the seat 3, and as shown in FIG. 6, the inner peripheral portion of the skin material 21 is on the lower surface of the inner shell 15. It is caught and fixed to the lower surface of the inner shell 15 by a tacker.

An upward curl portion 16a is formed on the inner circumference of the outer shell 16 over the entire circumference, and the inner circumference portion of the skin material 21 is pressed from below by the curl portion 16a. Therefore, the skin material 21 is held inside the handle hole 23 in a stretched state so that wrinkles cannot be seen. Therefore, the aesthetics can be improved.

Further, since the hand inserted into the handle hole 23 hits the lower surface of the outer shell 16, it can be wiped off even if it gets dirty. Therefore, it is possible to prevent the inner peripheral portion of the skin material 21 from becoming dirty and unsightly during long-term use. As shown in FIGS. 1C and 1D, a pair of front and rear finger hook ribs 16b extending along the longitudinal inner edge of the handle hole 23 are projected downward on the lower surface of the outer shell 16. Therefore, it is possible to prevent the finger from slipping. Further, the rigidity of the outer shell 16 is remarkably increased by the curl portion 16a and the finger hook rib 16b.

Since the leg support 1 has a smaller diameter than the seat 3, the arm portion 18 is inclined so as to move away from the axis of the gas cylinder as it goes upward, and the left and right arm portions 18 are the lengths of the handle holes 23. It is spreading in the direction. Then, as shown in FIGS. 5 and 6, a push valve 24 as an example of the unlocking member protrudes from the upper end of the gas cylinder, and the push valve 24 is pushed by the elevating operation device provided on the seat support 2. The gas cylinder is unlocked. This point will be described next.

(2). Lifting operation device For example, as shown in FIGS. 5 and 6, the lifting operation device includes a pair of elongated levers 25 and an operating body 26 that pushes the push valve 24 in conjunction with the movement of the lever 25. ing. The lever 25 is fitted in a long groove 27 formed in the arm portion 18, and a finger rest portion 28 that a person can touch and push with a fingertip is formed at the upper end portion. The finger contact portion 28 enters into the relief hole 29 formed in the arm portion 18 from the inside.

On the other hand, as shown in FIGS. 3 and 6, for example, the operating body 26 is arranged in the recess 30 of the upward opening formed in the lower ring portion 14 of the seat holder 2, and the operating body 26 has a pair of arms. The pushing portion 31 formed at the lower end portion of the portion 18 hits from above. The tip of the pushing portion 31 is rounded, and a center rib 32 is formed on the upper surface of the operating body 26 so as to be sandwiched between the pushing portions 31 of the left and right arm portions 18. A fillet is attached to the hem of the center rib 32 corresponding to the roundness of the pushing portion 31 (the fillet also has a meaning of reinforcement). The center rib 32 is an example of the relative movement control unit described in the claim.

As shown in FIGS. 6 and 7, a flange 26a projecting outward is formed at the upper end of the operating body 26, and the flange 26a is urged upward by the spring 33. An annular rib 34 for positioning the spring 33 so as not to shift laterally is provided in the recess 30 of the lower ring portion 14 in the seat holder 2.

For example, as is clearly shown in FIG. 6B, the flange 26a of the operating body 26 is formed with four notches 26b, while the recess 30 of the lower ring portion 14 of the seat holder 2 is notched. A guide rod 30a that is loosely fitted to the 26b is erected. Therefore, it is possible to prevent the operating body 26 from shifting forward / backward / left / right or turning horizontally, and to rotate the operating body 26 in a stable posture.

When the finger contact portion 28 at the upper end of the arm portion 18 is pushed inward, the pushing portion 31 rotates so as to move downward. Therefore, as a means for rotatably holding the arm portion 18, for example, as shown in FIG. 6, a support shaft 35 is integrally formed at a lower portion closer to the pushing portion 31 than the upper and lower intermediate portions, and the support shaft 35 is formed. It is held from above by the bearing cap 36. The bearing cap 36 is fixed to the arm portion 18 by two upper and lower screws 37, and the arm portion 18 forms a boss portion 18a on which the bearing cap 36 is placed. Further, the arm portion 18 is formed with a hollow portion 38 (clearly shown in FIG. 5) into which the bearing cap 36 is inserted.

A cover 39 that covers the bearing cap 36 and the operating body 26 from above is arranged on the seat holder 2. The cover 39 is fitted in the long groove 27, and the downward upper engaging claw 40 provided at the upper end is fitted in the engaging hole 41 formed in the bearing cap 36 by using elastic deformation.

Further, as shown in FIG. 7 (B), the lower engaging claws 43 are projected downward from the lower front and rear portions of the lower end of the cover 39, while the recess 30 of the lower ring portion 14 in the seat holder 2 is provided. In addition, an engaging rib 42 having an engaging hook portion 42a in which the lower engaging claw 43 is elastically deformed and engaged is provided. As can be easily inferred from FIG. 6B, the pair of engaging ribs 42 also serves as a guide function for suppressing the front-rear displacement of the operating body 26. As shown in FIG. 7B, a through hole 44 formed for forming the engaging rib 42 is opened vertically in the recess 30 of the lower ring portion 14 in the seat holder 2.

The pair of upper engaging claws 40 are separated from each other in the longitudinal direction (left-right direction) of the handle hole 23, while the pair of lower engaging claws 43 are separated from each other in the front-rear direction orthogonal to the longitudinal direction of the handle hole 23. ing. Therefore, the position of the upper engaging claw 40 and the position of the lower engaging claw 43 are orthogonal to each other by 90 °. Therefore, the cover 39 can be firmly attached to the seat holder 2 without causing floating.

As shown in FIGS. 6 and 7, a recess 45 opened toward the long groove 27 is formed in the upper part of the lever 25, while an upper wall 46 separating the long groove 27 and the relief hole 29 is formed in the arm portion 18. Has been done. The lever 25 is set so that the center of gravity is at the upper part where the finger rest 28 is located. Each member except the gas cylinder is an injection-molded product made of synthetic resin, but for example, the seat holder 2 and the base body 7 can be die-cast aluminum products.

(3). Summary With the above configuration of the present embodiment, when the finger rest portion 28 of the lever 25 is pressed with a finger, the lever 25 rotates about the support shaft 35, and then FIG. 7 (A). ), The operating body 26 is pushed and rotated (the posture changes), whereby the push valve 24 of the gas cylinder is pushed and the gas cylinder is unlocked.

The seat 3 has a novel shape supported by the left and right arm portions 18 curved upward, but the lever 25 is elongated and rod-shaped and is stored in the long groove 27 of the arm portion 18, so that the lever 25 Is not noticeable and has a clean and lean appearance. Further, since both the bearing cap 36 and the operating body 26 are covered by the cover 39, the bearing cap 36 and the operating body 26 are clean as a whole even though there is a large space below the seat 3.

Since the seat 3 is a rounded square, any one of the four postures can be taken so that the four sides are located in the front, back, left, and right, but the handle hole 23 is a long hole. Therefore, it is common to use the handle hole 23 so as to have a long posture in the left-right direction. Then, since the pair of arm portions 18 are located on the left and right sides of the seated person, the seated person can operate the lever 25 with either the right hand or the left hand to unlock the gas cylinder. Therefore, the height of the seat 3 can be easily adjusted without providing the ring portion as in Patent Document 1.

When the cover 39 is engaged with the bearing cap 36 as in the present embodiment, the engaging hole 41 can be easily formed, so that the arm portion 18 does not need to be processed so as to appear in the appearance. The aesthetics can be improved in this respect as well. Further, the cover 39 is also engaged with the engaging rib 42 formed in the lower ring portion 14 of the seat holder 2, but the engaging rib 42 and the pull-out hole 44 are covered with the cover 39 from above. Since the opening hole 44 is also blocked from being visible from below by the upper protection cylinder 11, the engaging portion of the cover 39 is not visible to the public. The aesthetics can be improved in this respect as well.

As shown in FIG. 7A, when the operating body 26 is rotated by one lever 25, the operating body 26 is held and held from above by the other lever 25. Therefore, the rotation of the operating body 26 can be ensured, and the push valve 24 can be reliably pushed down. Further, since the center rib 32 of the operating body 26 is sandwiched between the pushing portions 31 of the pair of levers 25, the operating body 26 rotates with almost no lateral displacement and pushes down the push valve 24. Also in this aspect, the rotation operation of the operating body 26 and the unlocking of the gas cylinder can be ensured.

That is, in the present embodiment, since the pair of levers 25 are independent of each other, even if one lever 25 rotates, the other lever 25 does not rotate and holds and holds the operating body 26 from above. Therefore, it is possible to prevent the operating body 26 from floating and accurately push down the push valve 24. Further, when the operating body 26 is returned by the spring 33, the operating body 26 is held in a posture so as not to be displaced by the guide rod 30a, and the center rib 32 is guided so as to return between the left and right levers 25. It is accurately returned to the predetermined posture.

Further, when the lever 25 is attached to the arm portion 18 by the bearing cap 36, the lever 25 is temporarily held so as not to be displaced by the pushing portion (tip portion) 31 hitting the center rib 32, so that the lever 25 is temporarily held by the arm portion. After setting it to 18, you can release the hand, hold the bearing cap 36 with one hand, and hold the driver tool with the other hand to screw in the screw.

That is, according to the explanation with reference to FIG. 6A, since the lever 25 has the center of gravity at the upper part where the finger rest portion 28 is located, even if the lever 25 is pushed upward by the spring 33 via the center rib 32, the lever 25 is lifted. The finger contact portion 28 is in contact with the upper end of the relief hole 29 (the lever 25 is in a state of being stretched between the center rib 32 of the operating body 26 and the upper inner surface of the relief hole 29). Moreover, the upper portion of the lever 25 is supported by the upper wall 46.

Therefore, after setting the lever 25, the hand is released to set the bearing cap 36, and then the screwing operation can be performed. In other words, since the lever 25 is temporarily held by the center rib 32 and the relief hole 29, even if the operating body 26 and the lever 25 are set and then released, the operating body 26 and the lever 25 remain in a stable state. Temporarily held. As a result, the bearing caps 36 can be overlapped and the screws 37 can be easily screwed in.

Further, since the operating body 26 is regulated to be displaced in the horizontal direction by the center rib 32 and the guide rod 30a, the operating body 26 and the left and right levers 25 are stable even if the operating body 26 is only mounted on the spring 33. It is held in the state. Therefore, it is possible to ensure that the lever 25 is temporarily held before the bearing cap 36 is attached, and after the bearing cap 36 is fixed, the operating body 26 is held in a stable posture as described above.

Further, since the lever 25 is held inseparably by the bearing cap 36 and the posture of the operating body 26 is held by the lever 25, the guide rod 30a, etc., the lever 25 and the operating body are held even if the elevating operation device is turned upside down. 26 can be operated stably. Therefore, it can be diverted to a chair that is operated by the lever 25 at the feet.

As can be inferred from FIG. 7A, in the present embodiment, when the finger contact portion 28 of the lever 25 is pushed too much, the finger contact portion 28 hits the outer shell 16 and excessive rotation of the lever 25 is prevented. Therefore, there is no problem that the lever 25 is broken or deformed by pushing the finger rest portion 28 too much.

Although the embodiments of the present invention have been described above, the present invention can be embodied in various ways. For example, when an arm portion is provided on the seat support, three or four arm portions are provided at equal intervals in the circumferential direction, and a lever can be arranged on each arm portion. It is also possible to provide a waist support portion on the seat or the seat support. The present invention can also be applied to a chair that does not swing.

As a relative movement control part that holds the operating body and the lever so that they do not shift in the horizontal direction, a downward hook is formed at the lower end of the lever, while a recess where the downward hook of the lever fits on the upper surface of the operating body. It is also possible to form. Further, the lever can be configured to rotate or slide when the finger rest portion is pulled upward. As a guide means for holding the operating body so as not to shift laterally, it is also possible to form the operating body in a quadrangular shape in a plan view and surround each corner portion with an L-shaped guide rib.

The present invention can be applied to a chair in which the leg columns are composed of gas cylinders. Therefore, it can be used industrially.

1 Monopod support (gas cylinder)
2 Bearing 3 Seat 4 Gas cylinder outer cylinder 5 Gas cylinder inner cylinder 6 Base 7 Base body 8 Ground body 14 Lower ring part 15 Inner shell 16 Outer shell 17 Upper ring part 18 Arm part 23 Handle hole 25 Lever 26 Operation Body 27 Long groove 28 Finger rest 29 Relief hole 30 Recess 31 Lever pushing part 32 Center rib as an example of engaging part 35 Support shaft 36 Bearing cap 39 Cover

Claims (5)

A telescopic leg strut made of a gas cylinder and a seat supported by the leg strut via a seat support are provided, and the seat support is provided with an elevating operation device that unlocks the gas cylinder by the operation of a seated person. It is an arranged configuration,
The elevating operation device includes a plurality of levers that are independently arranged apart from each other in the circumferential direction, and an operating body that takes an unlocked posture and unlocks the gas cylinder by operating the levers by a seated person. Each of the levers has an elongated shape extending in a direction intersecting the axis of the gas cylinder in a plan view.
Chair. The seat holder has a lower ring portion fixed to the upper end portion of a movable portion of the gas cylinder, an upper ring portion to which the seat is fixed, and a plurality of arm portions connected to the upper and lower ring portions. Then, the arm portion is inclined so as to be separated from the axis of the gas cylinder as it goes upward.
While the lever is arranged inside each arm portion so as to rotate by pushing or pulling a finger pad provided at the upper end portion of the lever.
Each arm portion of the seat holder has a relief hole for allowing the operation of the finger rest portion of the lever.
The chair according to claim 1. A long groove long in the longitudinal direction is formed on the inner surface of each of the arm portions, and when the lever pushes the finger contact portion from the outside in the long groove, the middle portion between the upper end and the lower end is used as a fulcrum. Arranged to rotate,
The chair according to claim 2. Each of the levers has a support shaft that serves as a rotation fulcrum, and the support shaft is rotatably held by a bearing cap that is stacked and fixed to the arm portion from above.
In addition, a cover covering each of the bearing caps and the operating body is arranged on the arm portion.
The chair according to claim 3. One or both of the operating body and the lever is formed with a relative motion regulating portion that prevents the operating body and the lever from being displaced in the horizontal direction.
The chair according to any one of claims 1 to 4.

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