JP3232201U - Chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chair capable of raising and lowering a seating portion with a relatively small force. SOLUTION: A chair has a first member 341 in which an elevating portion 30 is formed in a shaft shape, one end is slidably connected to a seating portion, and the other end is slidably connected to a support portion. The second member 351 is formed in a shaft shape, one end is slidably connected to the seating portion, and the other end is slidably connected to the support portion, and one end side is slidably connected to the first member 341. With the telescopic member 370 connected to the connected first connecting portion 361, the other end side is connected to the second connecting portion 362 to which the second member is connected, and the total length changes due to the change in the internal pressure based on the operation of the user. By extending the total length of the telescopic member 370, the first connecting portion 361 and the second connecting portion 362 are separated from each other, so that the seating portion is raised and the total length of the telescopic member 370 is shortened. When the connecting portion 361 and the second connecting portion 362 are close to each other, the seating portion is lowered. [Selection diagram] Fig. 3

Description

The present invention relates to a chair in which the seating portion is raised and lowered.

Conventionally, for example, a chair for playing a musical instrument has a function of adjusting the height of a seating portion on which the user is seated according to the physique of the user.

For example, in Patent Document 1, X-shaped link mechanisms supported in the lower fixed base and the upper movable base are arranged side by side in the longitudinal direction, and the two link mechanisms are right-handed and left. Proposed a chair for playing musical instruments that is connected by a turnbuckle-shaped bolt consisting of screws and raises and lowers the seat plate, which is the seating part placed on the movable base, by rotating the knob placed at the tip of the bolt. Has been done.

Japanese Unexamined Patent Publication No. 2000-14477

However, when a turnbuckle-shaped bolt is rotated by a knob to raise or lower the seat plate, the weight of the seat plate or the like becomes a frictional force at the part where the link mechanism and the bolt are screwed, and the knob cannot be rotated. There is a problem that a relatively large force is required.

The present invention has been made in view of the above points, and an object of the present invention is to provide a chair capable of raising and lowering a seating portion with a relatively small force.

(1) The seating area where the user sits and
A support portion that supports the seating portion from below, and a support portion that supports the seating portion from below.
A lifting portion that is fixed to the supporting portion and raises and lowers the seating portion is provided.
The elevating part
A first member which is formed in a shaft shape, one end of which is slidably connected to the seating portion, and the other end of which is slidably connected to the support portion.
A second member which is formed in a shaft shape, one end of which is slidably connected to the seating portion, and the other end of which is slidably connected to the support portion.
One end side is connected to the first connection part connected to the first member, and the other end side is connected to the second connection part to which the second member is connected. With a variable elastic member,
By extending the total length of the telescopic member, the first connecting portion and the second connecting portion are separated from each other, and the seating portion is raised.
A chair characterized in that the first connection portion and the second connection portion are brought close to each other and the seating portion is lowered by reducing the total length of the telescopic member.

In the invention of (1), the chair includes a seating portion, a supporting portion, and an elevating portion.
The seating part is seated by the user.
The support portion supports the seating portion from below.
The elevating part is fixed to the support part, has a first member, a second member, and an expansion / contraction member, and raises and lowers the seating part.
The first member is formed in a shaft shape, one end of which is slidably connected to the seating portion and the other end of which is slidably connected to the support portion.
The second member is formed in a shaft shape, one end of which is slidably connected to the seating portion and the other end of which is slidably connected to the support portion.
One end of the telescopic member is connected to the first connecting portion connected to the first member, and the other end side is connected to the second connecting portion to which the second member is connected. The total length changes.
Then, in the chair, the first connection portion and the second connection portion are separated from each other by extending the total length of the expansion / contraction member, the seating portion is raised, and the total length of the expansion / contraction member is shortened, so that the first connection portion and the second connection portion are connected. The parts are close to each other, and the seating part descends.

According to the invention of (1), based on the operation of the user, the elastic member whose overall length changes due to the internal pressure is extended, so that the first connection portion and the second connection portion are separated from each other, the seating portion is raised, and the elastic member is increased. As the total length of the is shortened, the first connection portion and the second connection portion are brought close to each other, and the seating portion is lowered.
As a result, the first connecting portion and the second connecting portion are separated or brought close to each other and seated without using a member such as a screwing member such as a bolt whose weight of the seating portion becomes a frictional force. It is possible to move the part up and down. Further, by expanding and contracting the entire length of the expansion / contraction member by internal pressure, the seating portion can be smoothly moved up and down.
Therefore, it is possible to provide a chair that can raise and lower the seating portion with a relatively small force.

(2) The elevating part is
It is formed in a shaft shape with the first member, one end is slidably connected to the seating portion, the other end is slidably connected to the support portion, and the first member is rotated at the center. A first elevating part including another first member movably connected, and
It is formed in a shaft shape with the second member, one end is slidably connected to the seating portion, the other end is slidably connected to the support portion, and is rotated to the second member at the center. A second elevating part including a second member that is movably connected and a second elevating part.
The first connection portion is provided on the seating portion side.
The second connection portion is provided on the support portion side, and is provided.
When the distance between both ends of the first member and the separate first member and the distance between both ends of the second member and the separate second member are close to each other, the seating portion rises.
The seating portion is characterized in that the seating portion is lowered by separating the distance between both ends of the first member and the separate first member and the distance between both ends of the second member and the separate second member. The chair described in (1).

In the invention of (2), the elevating part includes a first elevating part and a second elevating part.
The first elevating part is formed in a shaft shape with the first member, one end is slidably connected to the seating part, the other end is slidably connected to the support part, and the first member is slidably connected to the support part. It is provided with another first member rotatably connected to the.
The second elevating part is formed in a shaft shape with the second member, one end is slidably connected to the seating part, the other end is slidably connected to the support part, and the second member is slidably connected to the support part. It is provided with another second member rotatably connected to the.
The first connecting portion is provided on the seating portion side.
The second connection portion is provided on the support portion side.
Then, in the chair, the seating portion rises when the distance between both ends of the first member and the separate first member and the distance between both ends of the second member and the separate second member are close to each other.
Further, in the chair, the seating portion is lowered by separating the distance between both ends of the first member and the separate first member and the distance between both ends of the second member and the separate second member.

According to the invention of (2), one end side (first connection part) of the telescopic member is connected to the seating part side of the first elevating part provided with the first member, and the other end side (second connection part) is connected. , It is connected to the support portion side of the second elevating portion including the second member. That is, the telescopic members are arranged obliquely with respect to the first elevating part and the second elevating part.
As a result, for example, the seating portion can be moved up and down with a smaller force than when the seating portion is arranged horizontally with respect to the first elevating portion and the second elevating portion.

(3) The elevating part is
With a first auxiliary member which is formed in a shaft shape, one end is rotatably supported by the seating portion, and the other end is rotatably supported by an intermediate portion of the first member. ,
A second auxiliary member which is formed in a shaft shape, one end of which is rotatably supported by the seating portion, and the other end of which is rotatably supported by an intermediate portion of the second member. The chair according to (1) or (2), which comprises.

In the invention of (3), the elevating part includes a first auxiliary member and a second auxiliary member.
The first auxiliary member is formed in a shaft shape, one end of which is rotatably supported by a seating portion, and the other end of which is rotatably supported by an intermediate portion of the first member. ..
The second auxiliary member is formed in a shaft shape, one end of which is rotatably supported by a seating portion, and the other end of which is rotatably supported by an intermediate portion of the second member. ..

According to the invention of (3), the first auxiliary member rotatably supported by the seating portion is rotatably supported by the intermediate portion of the first member, and the first auxiliary member is rotatably supported by the intermediate portion of the second member. The second auxiliary member rotatably supported by the portion was rotatably supported.
Here, when the seating portion is lowered to the lowest position and the first member and the second member are in a horizontal or near-horizontal state, the total length of the telescopic member is extended and the first connecting portion and the second connecting portion are separated from each other. Even if the attempt is made, the ends of the first member and the second member are supported by the end of the portion connected to the seating portion in the sliding direction, and the first connection portion and the second connection portion can be separated from each other. It disappears (it becomes impossible to raise the seating part).
According to the invention of (3), by providing the first auxiliary member and the second auxiliary member, it is possible to prevent the first member and the second member from being in a horizontal or near-horizontal state, so that the seating portion is raised. It is possible to prevent the situation where it cannot be made to occur.

According to the present invention, it is possible to provide a chair that can raise and lower the seating portion with a relatively small force.

It is a perspective view of the chair which concerns on one Embodiment of this invention. It is an exploded perspective view of the chair which concerns on one Embodiment of this invention. It is a perspective view which looked at the elevating part which concerns on one Embodiment of this invention from diagonally below. It is a perspective view which looked at the elevating part which concerns on one Embodiment of this invention from diagonally below. It is a perspective view of the chair which concerns on one Embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, the same or similar configurations are designated by the same reference numerals, and the description thereof will be omitted or simplified.

FIG. 1 is a perspective view of a chair according to an embodiment of the present invention. In the present embodiment, the chair 1 is a chair for a musical instrument on which a user who plays a musical instrument such as a piano is seated, but the chair 1 is not limited to this, and the chair 1 can be applied to a chair for various purposes. It is possible.

The chair 1 is attached to the seating portion 10 on which the user sits, the support portion 20 that supports the seating portion 10 from below, the elevating portion 30 that is fixed to the support portion 20 and raises and lowers the seating portion 10, and the support portion 20. It is provided with an auxiliary unit 40 on which the user can rest his / her feet.

The seating portion 10 has a cushion on which the user sits is arranged on the upper surface side, and the lower surface side is connected to the elevating portion 30 fixed to the support portion 20. In the example shown in FIG. 1, the seating portion 10 is formed in a quadrangular shape in a top view, but the seating portion 10 is not limited to this, and may be formed in a circular shape or another polygonal shape.

The support portion 20 is located near the outer circumference of the seating portion 10 (four corners in the example shown in FIG. 1), and is provided with a plurality of legs 21 extending downward (four corners in the example shown in FIG. A frame portion 22 that connects the upper end side of the adjacent leg portions 21 to each other is provided.

FIG. 2 is an exploded perspective view of the chair according to the embodiment of the present invention.
The elevating portion 30 is connected to the lower member 310 fixed to the support portion 20, the upper member 320 fixed to the seating portion 10, the lower member 310 and the upper member 320, and separates the lower member 310 and the upper member 320 from each other. Alternatively, the seating portion 10 is moved up and down with the elevating member 330 and the elevating member 330 brought close to each other.

3 and 4 are perspective views of the elevating portion according to the embodiment of the present invention as viewed from diagonally below. FIG. 3 shows a state in which the lower member 310 and the upper member 320 are close to each other. FIG. 4 shows a state in which the lower member 310 and the upper member 320 are separated from each other.

The lower member 310 is attached to each of the inner side surfaces of a pair of frame portions 22 (see FIG. 1) facing each other of the support portion 20, and is formed of a plate-like body extending along the frame portion 22.

Each of the pair of lower members 310 is a hole extending along the extending direction of the frame portion 22 (see FIG. 1) (left-right direction in the example shown in FIG. 3) along the extending direction of the lower member 310, which will be described later. A first guide 311 is formed in which the lower end portion of the first member 341 is slidably engaged with the first member 341.

Each of the pair of lower members 310 is a hole extending along the extending direction of the frame portion 22 (see FIG. 1) (left-right direction in the example shown in FIG. 3) along the extending direction of the lower member 310, which will be described later. The lower end of the second member 351 is slidably engaged to form a second guide 312 formed having the same length as the first guide 311.

The upper member 320 is attached to the lower surface of the seating portion 10 and is formed in a quadrangular frame shape when viewed from above.

The upper member 320 is a pair of lower members 310 above the pair of lower members 310 that extend along the extending direction (left-right direction in the example shown in FIG. 3) of the seating portion 10 (see FIG. 1). Each of the frames (frames arranged in parallel with the frame) is a hole extending along the direction in which the frame extends, and the first guide 321 slidably engages with the upper end of the first member 341 described later. It is formed.

Further, each of the upper members 320 extends in the direction in which the frame extends, and is a hole longer than the first guide 321. The upper end of another first member 342, which will be described later, is slidable. Another first guide 322 to be engaged is formed.

Further, the upper member 320 is a hole extending into the frame along the direction in which the frame extends and having the same length as the first guide 321. The upper end of the second member 351 described later slides. A second guide 323 that engages freely is formed.

Further, the upper member 320 is a hole extending into the frame along the direction in which the frame extends and having the same length as the separate first guide 322, and the upper end portion of the separate second member 352, which will be described later, is formed. , A separate second guide 324 that slidably engages is formed.

A wall member (for example, a bellows) that can expand and contract in the moving direction of the upper member 320 may be arranged between the lower member 310 and the upper member 320. As a result, it is possible to prevent the user from pinching the finger when the lower member 310 and the upper member 320 are close to each other from the state where the lower member 310 and the upper member 320 are separated from each other.

The elevating member 330 is arranged along the extending direction of the pair of first elevating portions 340 and the seating portion 10 (see FIG. 2) arranged so as to face each other (in the example shown in FIGS. 3 and 4 in the front-rear direction). A pair of second elevating parts 350 arranged in parallel with the first elevating part 340 and facing each other (in the example shown in FIGS. 3 and 4 in the front-rear direction), a first elevating part 340 and a second elevating part. It includes a telescopic member 370 that operates in conjunction with the 350.

The first elevating part 340 is formed in a substantially X shape when viewed from the front, and is rotatably connected to the first member 341 arranged so as to be inclined in a predetermined direction and to the first member 341 at the center. Another first member 342, which is arranged so as to be inclined in the direction opposite to the direction, is provided. The first elevating portion 340 has the upper end side and the lower end of the first member 341 and the separate first member 342 from the state where the upper end side and the lower end side of the first member 341 and the separate first member 342 are separated (the state shown in FIG. 3). When the sides are close to each other (the state shown in FIG. 4), the height becomes high (the upper end and the lower end are separated from each other).

The first member 341 is formed in a shaft shape, and its upper end is slidably connected to the first guide 321 of the upper member 320 attached to the seating portion 10 (see FIG. 1). Further, the lower end portion of the first member 341 is slidably connected to the first guide 311 of the lower member 310 attached to the frame portion 22 (see FIG. 1) of the support portion 20.

The separate first member 342 is formed in a shaft shape, and the upper end portion is slidably connected to the separate first guide 322 of the upper member 320 attached to the seating portion 10 (see FIG. 1). Further, the lower end portion of the separate first member 342 is rotatably supported by the lower member 310 attached to the frame portion 22 (see FIG. 1) of the support portion 20.

The second elevating part 350 is rotatably connected to the second member 351 which is formed in a substantially X shape when viewed from the front and is arranged so as to be inclined in the direction opposite to the predetermined direction, and to the second member 351 at the center. It is provided with another second member 352, which is arranged so as to be inclined in a predetermined direction. The second elevating part 350 has the upper end side and the lower end side of the second member 351 and the separate second member 352 from the state where the upper end side and the lower end side of the second member 351 and the separate second member 352 are separated (the state shown in FIG. 3). When the sides are close to each other (the state shown in FIG. 4), the height becomes high (the upper end and the lower end are separated from each other).

The second member 351 is formed in a shaft shape, and its upper end is slidably connected to the second guide 323 of the upper member 320 attached to the seating portion 10 (see FIG. 1). Further, the lower end portion of the second member 351 is slidably connected to the second guide 312 of the lower member 310 attached to the frame portion 22 (see FIG. 1) of the support portion 20.

The separate second member 352 is formed in a shaft shape, and its upper end is slidably connected to the separate second guide 324 of the upper member 320 attached to the seating portion 10 (see FIG. 1). Further, the lower end portion of the separate second member 352 is rotatably supported by the lower member 310 attached to the frame portion 22 (see FIG. 1) of the support portion 20.

The pair of first member 341, the pair of separate first member 342, the pair of second member 351 and the pair of separate second member 352 are connected by the first connecting portion 361 at the upper end portion, respectively.

Further, the pair of first member 341, the pair of separate first member 342, the pair of second member 351 and the pair of separate second member 352 are connected by the second connecting portion 362 at the lower end portion, respectively. There is.

The first connecting portion 361 and the second connecting portion 362 are arranged in a pair of first member 341, a pair of separate first member 342, a pair of second member 351 and a pair of separate second member 352 (FIGS. 3 and 3). In the example shown in 4, it is a shaft-shaped body extending in the front-rear direction). The first connecting portion 361 and the second connecting portion 362 may have a cylindrical shape or an angle shape.

Further, a first auxiliary member 363 is connected to each of the pair of first members 341.
The first auxiliary member 363 is formed in a shaft shape, one end thereof is rotatably supported by an upper member 320 attached to a seating portion 10 (see FIG. 1), and the other end portion is a first. It is rotatably supported by an intermediate portion of one member 341.

Further, a second auxiliary member 364 is connected to each of the pair of second members 351.
The second auxiliary member 364 is formed in a shaft shape and is rotatably supported by an upper member 320 attached to the seating portion 10 (see FIG. 1), and the other end is intermediate between the second auxiliary member 364. It is rotatably supported by the portion.

The telescopic member 370 is composed of a cylinder such as a gas spring, a metal spring, a resin spring, or a fluid spring, and one end side is connected to a first connecting portion 361 connected to an upper end portion of the first member 341, and the other. The end side is connected to the second connection portion 362 connected to the lower end portion of the second member 351. For example, the total length is changed by the internal pressure of the gas (gas inert) spring in the cylinder, and the user operates. The lock or lock is released based on. Further, the telescopic member 370 includes a lock mechanism such as a hydraulic type or a mechanical type.

For example, the telescopic member 370 can shift from the locked state in which the total length does not change to the released state in which the total length can be changed by the operation of the user in the operation unit 371. In the shortest state (state shown in FIG. 3), when the operation unit 371 is operated to shift to the release state, the total length of the telescopic member 370 is extended to the state shown in FIG. Further, in the telescopic member 370, when the operation unit 371 is operated and the state shifts to the release state in the state where the total length is extended (the state shown in FIG. 4), the user sits on the seating portion 10 (see FIG. When pressure is applied in the direction of the total length contraction due to the weight, the total length contracts, and when the operation of the operation unit 371 is stopped, the total length is locked at that time.

As described above, the chair 1 of the present embodiment can be lifted and lowered easily and speedily by one telescopic member 370 arranged diagonally, so that it is superior in space efficiency as compared with the case where other lifting mechanisms are provided. Excellent in economy. Further, as a whole, the chair 1 can have a wide range of motion by using a lot of links that rotatably support each member. The number of telescopic members 370 is preferably one, but a plurality of telescopic members 370 may be provided.

Next, the operation of the chair 1 will be described.
FIG. 5 is a perspective view of a chair according to an embodiment of the present invention.
In the chair 1, when the user operates the operation unit 371 and unlocks the expansion / contraction member 370 in the state where the seating portion 10 shown in FIG. 1 is the lowest, the total length of the expansion / contraction member 370 is extended. Then, the first connecting portion 361 connected to the upper end of the first member 341 of the first elevating portion 340 and the second connecting portion 362 connected to the lower end of the second member 351 , Separate from each other.
As a result, the upper end side and the lower end side of the first member 341 and the separate first member 342 of the first elevating part 340 and the second member 351 and the separate second member 352 of the second elevating part 350 are close to each other (FIG. The state shown in FIG. 4), the seating portion 10 shown in FIG. 1 moves to a position away from the support portion 20, and the state shown in FIG. 5 is obtained.

Further, in the chair 1, in a state where the seating portion 10 shown in FIG. 5 is moved to a position away from the support portion 20, the user operates the operating portion 371 to unlock the telescopic member 370, for example, sitting. When the seating portion 10 is pressed downward while sitting on the portion 10, the total length of the telescopic member 370 is shortened. Then, the first connecting portion 361 connected to the upper end of the first member 341 of the first elevating portion 340 and the second connecting portion 362 connected to the lower end of the second member 351 , Close to each other.
As a result, the upper end side and the lower end side of the first member 341 and the separate first member 342 of the first elevating part 340 and the second member 351 and the separate second member 352 of the second elevating part 350 are separated from each other (FIG. The state shown in FIG. 3), the seating portion 10 shown in FIG. 5 moves to a position close to the support portion 20, and the state shown in FIG. 1 is obtained.

In such an operation of raising and lowering the seating portion 10, the user stops the operation of the operating portion 371 at a position where the seating portion 10 reaches a desired height, thereby locking the telescopic member 370 and expanding and contracting the entire length. The seating portion 10 can be fixed at a desired height.

Returning to FIG. 1, the auxiliary portion 40 is, for example, a plate-shaped member arranged straddling the intermediate portion of two leg portions 21 adjacent to each other, and plays a musical instrument (for example, a piano). When the height of the seating portion 10 is adjusted to an appropriate position, for example, when the user has a relatively small physique such as a child and the foot does not touch the floor, the user can use the foot. It is a member on which to put. The height of the auxiliary portion 40 is adjustable in the intermediate portion between the two leg portions 21 adjacent to each other.

According to such a chair 1, the first connecting portion 361 and the second connecting portion 362 are separated from each other by extending the telescopic member 370 whose overall length is changed by the internal pressure based on the operation of the user, and the seating portion 10 is raised. As the overall length of the telescopic member 370 shrinks, the first connecting portion 361 and the second connecting portion 362 come close to each other, and the seating portion 10 descends.
As a result, the first connecting portion 361 and the second connecting portion 362 are separated or brought close to each other without using a member such as a screwing member such as a bolt in which the weight of the seating portion 10 becomes a frictional force. Then, the seating portion 10 can be raised and lowered. Further, by expanding and contracting the entire length of the expansion / contraction member 370 with a gas spring, a metal spring, or the like, the seating portion 10 can be smoothly moved up and down.
Therefore, it is possible to provide a chair that can raise and lower the seating portion 10 with a relatively small force.

Further, according to the chair 1, one end side (first connecting portion 361) of the telescopic member 370 is connected to the seating portion 10 side of the first elevating portion 340 including the first member 341, and the other end side (second connecting portion 361). The connecting portion 362) is connected to the support portion 20 side of the second elevating portion 350 including the second member 351. That is, the telescopic member 370 is arranged obliquely with respect to the first elevating portion 340 and the second elevating portion 350.
As a result, for example, the seating portion 10 can be moved up and down with a smaller force than when the seating portion 10 is arranged horizontally with respect to the first elevating portion 340 and the second elevating portion 350.

Further, according to the chair 1, by providing the first auxiliary member 363 and the second auxiliary member 364, it is possible to prevent the first member 341 and the second member 351 from being in a horizontal or near-horizontal state. It is possible to prevent a state in which the portion 10 cannot be raised.

The present invention is not limited to the above embodiment.

1 Chair 10 Seating part 20 Supporting part 21 Leg part 22 Frame part 30 Elevating part 40 Auxiliary part 310 Lower member 311 1st guide 312 2nd guide 320 Upper member 321 1st guide 322 Separate 1st guide 323 2nd guide 324 Separate 1st 2 Guide 330 Elevating member 340 1st elevating part 341 1st member 342 Separate 1st member 350 2nd elevating part 351 2nd member 352 Separate 2nd member 361 1st connecting part 362 2nd connecting part 363 1st auxiliary member 364 1st 2 Auxiliary member 370 Telescopic member 371 Operation unit

Claims (3)

The seating area where the user sits and
A support portion that supports the seating portion from below, and a support portion that supports the seating portion from below.
A lifting portion that is fixed to the supporting portion and raises and lowers the seating portion is provided.
The elevating part
A first member which is formed in a shaft shape, one end of which is slidably connected to the seating portion, and the other end of which is slidably connected to the support portion.
A second member which is formed in a shaft shape, one end of which is slidably connected to the seating portion, and the other end of which is slidably connected to the support portion.
One end side is connected to the first connection part connected to the first member, and the other end side is connected to the second connection part to which the second member is connected. With a variable elastic member,
By extending the total length of the telescopic member, the first connecting portion and the second connecting portion are separated from each other, and the seating portion is raised.
A chair characterized in that the first connection portion and the second connection portion are brought close to each other and the seating portion is lowered by reducing the total length of the telescopic member. The elevating part
It is formed in a shaft shape with the first member, one end is slidably connected to the seating portion, the other end is slidably connected to the support portion, and the first member is rotated at the center. A first elevating part including another first member movably connected, and
It is formed in a shaft shape with the second member, one end is slidably connected to the seating portion, the other end is slidably connected to the support portion, and is rotated to the second member at the center. A second elevating part including a second member that is movably connected and a second elevating part.
The first connection portion is provided on the seating portion side.
The second connection portion is provided on the support portion side, and is provided.
When the distance between both ends of the first member and the separate first member and the distance between both ends of the second member and the separate second member are close to each other, the seating portion rises.
The seating portion is characterized in that the seating portion is lowered by separating the distance between both ends of the first member and the separate first member and the distance between both ends of the second member and the separate second member. The chair according to claim 1. The elevating part
With a first auxiliary member which is formed in a shaft shape, one end is rotatably supported by the seating portion, and the other end is rotatably supported by an intermediate portion of the first member. ,
A second auxiliary member which is formed in a shaft shape, one end of which is rotatably supported by the seating portion, and the other end of which is rotatably supported by an intermediate portion of the second member. The chair according to claim 1 or 2, wherein the chair comprises.

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