JP6271869B2 - Chair - Google Patents

Description

  The present invention relates to a chair capable of nesting, which has a gas cylinder type leg support and can be fitted in the front-rear direction by flipping up a seat.

  In order to save storage space without using a chair, fitting (nesting) the chairs in the front-rear direction (horizontal direction) is widely performed. This type of nestable chair is often called a pipe chair with a skeleton made of metal pipe, but it can be nested with a chair (rotary chair) that uses an extendable gas cylinder as a leg post. A structure is also proposed, and examples thereof are disclosed in Patent Documents 1 and 2.

  Specifically, in Patent Document 1, first, the leg has four front and rear legs, the height of the front two legs is lower than the height of the two rear legs, By setting the spread angle of the two front legs smaller than the spread angle of the two rear legs, the leg devices placed at the front and back are set to fit together, and the seat jumps up to a substantially vertical posture. And the chairs arranged at the front and back can be fitted together (nesting is possible).

Furthermore, Patent Document 1 includes an automatic lifting device that unlocks the gas cylinder and raises the fixed base to the maximum height when the seat is flipped up. This automatic lifting device uses a circumferential cam with the outer circumferential surface around the pivot axis of the seat as a cam surface, and the gas cylinder lock release valve is activated by pushing the operating rod of the gas cylinder with the circumferential cam. It is supposed to be pressed. Then, it is adapted to the operating rod as possible springing up the seat Kiru rotates, therefore, the fixed base is elevated in the end of the flip-up rotation of the seat.

Japanese Patent No. 3730119 Japanese Patent No. 4306922

  As described above, the nesting of the chair is to reduce the storage space when not in use, and conventionally, there are many simple structures such as a pipe chair. However, with a simple structure, the sitting comfort when sitting for a long time was not good. On the other hand, if a nesting structure is adopted for a gas cylinder type chair as in Patent Documents 1 and 2, it is preferable because the height of the seat can be adjusted according to the height of the user and the torsion of the body can be allowed.

  And since the thing of patent document 1 is the nesting state and the height of each chair is uniform, it is possible to make the fitting between the chairs deep as well as it looks good (the height of the seat and the backrest) If they are not aligned, there may be cases where the elements of the front and back chairs hit and cannot be fitted deeply.

However, in the automatic lifting device using a cam as in Patent Document 1, the force that pushes the lock release valve of the gas cylinder acts as a resistance against the seat flip-up rotation. If the gas cylinder lock release valve acts as a resistance against the springing up of the seat, it will be misunderstood that the operator has flipped the seat up and turned completely, and the turning operation is stopped halfway. There is concern about the problem of nesting without raising.

  Furthermore, the structure of Patent Document 1 is good if the pivot point of the seat is located in the vicinity of the unlocking valve, but if the pivot point of the seat is away from the unlocking valve, it is practically not applicable. There is an essential problem.

  The present invention has been made to improve the current situation.

The chair of this application is
A leg device having a leg column composed of a gas cylinder that is free to expand and contract when unlocked, a fixed base provided at the upper end of the leg column, and the fixed base or a support frame provided on the fixed base. a backrest, have said fixed base or support frame or flipped back pivotally mounted seat and when set to a higher bouncing the seat be fitted a plurality in the longitudinal are allowed ,
And, when the a flipping the pre Symbol seat locking gas cylinder tilts the seat instead of the free state is released and the automatic increase device for changing the gas cylinder in the locked state, the operation of the seated person in a state in which defeated the seat And a manual operating tool capable of releasing the lock of the gas cylinder.

And the said automatic raising apparatus is equipped with the operation member urged | biased by the spring means so that the said gas cylinder may be hold | maintained to a free state, and if the said seat is fallen, the said operation member will move against a spring force especially Therefore a configuration in which the gas cylinder is moved to the locked state,
The actuating member is connected to the fixed base so that one end and the other end of the actuating member move up and down to rotate in a seesaw shape, and a gas cylinder is disposed on one side of the actuating member with a rotation fulcrum interposed therebetween. Provided with an operation part, on the other side across the rotation fulcrum, a spring receiving part and a pressed part to be pushed downward by the seat are provided,
And the rotation fulcrum of the said seat is located behind the said leg support | pillar, and the said operating member is arrange | positioned in front of the rotation fulcrum of the said seat.

According to a second aspect of the present invention, in the first aspect, the actuating member is disposed in a longitudinally longitudinal posture at a position in front of the leg support, and is vertically moved with a portion between the front end and the rear end as a fulcrum. The gas cylinder operating portion is formed at the rear end portion of the operating member, and the pressed portion is formed at the front end of the operating member.

The invention according to claim 3, in claim 2, wherein the fixed base is overlaying the upper lid in the opened box-like form came upward, the left and right horizontal supporting the seat in the front end portion of the lid While the ridge is formed,
The pressed portion of the actuating member in the automatic lifting device is in an upward posture and is disposed so as to be close to the rear end edge of the ridge in plan view, and is behind the ridge of the lid and the ridge. Is provided with a hole through which the pressed portion is exposed,
On the lower surface of the seat or the movable base to which the seat is attached, a pressing portion is formed to press the pressed portion below the upper end of the ridge.

  In the present invention, since the seat flip-up rotation is assisted by the spring means of the automatic lifting device, the seat lifting does not become heavy by providing the automatic lifting device. Can be done lightly.

  In addition, the seat can be swung up and rotated to a predetermined posture without causing misunderstanding to the operator, and the seat and the backrest can be accurately raised to the maximum height. You can nest in a beautiful state with a uniform posture.

Furthermore, since the operating member of the automatic lifting device is moved by the spring means, the automatic lifting device can be accurately operated regardless of where the rotation fulcrum of the seat is behind the gas cylinder . That is, the automatic lifting device can function properly without being restricted by the seat support structure or the pivot structure. Therefore, the applicable range is wide and the flexibility is excellent.

Actuating member for a simple structure a seesaw-like form, which is advantageous in terms of cost with an excellent reliability of the motion.

Further, when the configuration of claim 3 is adopted, the operating member of the automatic lifting device is hidden behind the ridge, so that it looks good when the seat is flipped up, and the operating member has clothes and objects. there is also an advantage that can prevent that from being caught.

BRIEF DESCRIPTION OF THE DRAWINGS It is an external view of the chair which concerns on embodiment, (A) is a perspective view in the attitude which raised the seat, (B) is a perspective view in the state which fell the seat, (C) is the state which removed the support frame of one side FIG. It is a separation perspective view of a 1st embodiment. (A) is the isolation | separation perspective view seen from the top, (B) is the isolation | separation perspective view seen from the bottom. (A) is a vertical side view of the main part, and (B) is a perspective view of the fixed base as seen from behind. (A) is a perspective view which shows the inside of a fixed base, (B) is a partial side view which shows a lock release state. (A) is a separated perspective view of a lock release lever and a bearing holder, (B) is a separated perspective view of a gas cylinder operation mechanism. (A) is a front view of a leg apparatus, (B) is a top view of the leg apparatus in a nesting state. It is a side view in a nesting state with the support frame on one side omitted.

(1). Outline Next, an embodiment of the present invention will be described with reference to the drawings. First, an outline will be described. In the following description, the words “front and rear” and “left and right” are used to specify the direction, which is based on a state viewed from a person who normally sits on a chair. The front view direction is the direction facing the seated person.

  As shown in FIG. 1, the chair includes a leg device 1, a seat 2, and a backrest 3 as major elements. As clearly shown in FIGS. 7 and 8, the leg device 1 includes a leg column 4 made of a gas cylinder, a center tube 5 that holds the leg column 4, and two front and rear units fixed to the center tube 5 by welding or the like. It has branch legs 6a and 6b, and casters 7 are attached to the tips of the respective branch legs 6a and 6b.

  The branch legs 6a and 6b extend in a radial direction from the central tube 5 and are inclined downward from the central tube 5, and their tips are bent in a vertical posture. By making the inclined posture of the front two branch legs 6a and the left-right distance between the tips different from those of the rear two branch legs 6b, the leg devices 1 arranged at the front and rear are allowed to fit each other. (Details will be described later).

  A box-like fixed base 8 is attached to the upper end of the leg support 4 with an upward opening. As shown in FIGS. 1 and 2, a pair of left and right protruding from the left and right outer sides of the seat 2 to the upper side of the seat 2 is fixed to the fixed base 8. The support frame 9 is fixed, and the backrest 3 is rotatably connected to the upper end of the support frame 9.

  The backrest 3 is composed of a back frame 10 opened in the front and rear and a back support 11 arranged in the opening, and as shown in FIGS. 1 and 2, the back frame 10 is located at a height position where the waist of the seated person hits. The projecting portion 10a projecting toward the front side and the outer side is provided so that the vertical width decreases toward the tip, and the outer end of the projecting portion 10a is connected to the upper connecting portion 12 of the upper end portion of the support frame 9 via the bearing bush 13. Are connected.

  Therefore, the backrest 3 rotates about the left and right horizontally long axis centering on the location of the upper connecting portion 12. Moreover, in this embodiment, the backrest 3 moves backward above the rotation fulcrum and moves forward before the rotation fulcrum for rocking. The bearing bush 12 also plays a role of regulating the rotation angle of the backrest 3.

  Although the boss part for connecting the back frame 10 is provided in the upper connection part 12 of the support frame 9, since the relationship with this invention is thin, illustration is abbreviate | omitted. The back support 11 of the backrest 3 has a structure in which a cushion is stretched on the front surface of the resin back plate, but it can also be made of a mesh material. At the upper end of the support frame 9, an elbow rest 9 a protruding forward is provided, and a pad 13 is attached to the elbow rest 9 a.

The seat 2 has a structure in which a cushion is stretched on the upper surface of a resin seat plate, and the seat 2 is attached to a movable base 15 having a square shape in plan view. As Figure 2, the rear end portion of the movable base 15, the Tsu支arm 17 projecting upwardly in the right and left outside of the movable base 15 is provided integrally with the upper and lower supporting frame 9 a top end portion of Tsu支arm 17 It is rotatably connected to the lower connecting portion 18 at a midway height position via a bearing member (not shown).

Accordingly, the movable base 15 (and the seat 2) is horizontally long with the rotation center (rotation fulcrum) O (see FIGS. 1C and 8) of the lower connecting portion 18 of the support frame 9 as the center. It rotates around the axis. Thereby, the seat 2 can be flipped up from a horizontal fallen posture to a raised posture opposite to the backrest 3. As clearly shown in FIG. 8, the support frame 9 has a rectangular shape protruding rearward in a side view, and the lower connecting portion 18 (rotation center O) is located behind the leg column 4 and the fixed base 8. Yes.
Although the movable base 15 is made of resin, an aluminum die cast product or a sheet metal processed product can also be adopted. It is also possible to configure the suspension arm 17 separately from the movable base 15 . A large number of reinforcing ribs are provided on the movable base 15 .

A pair of left and right rails 19 is mounted on the movable base 15 so as to be movable back and forth, and the seat 2 is fixed to the rails 19. The rail 19 is biased in the backward direction by a built-in spring (not shown). Then, left and right horizontally long stays 21 are fixed to the rear end of the rail 19, and upward passive arms 21 a are integrally provided on both left and right ends of the stays 21, and the upper ends of the passive arms 21 a are provided at the lower ends of the backrest 3. Is inserted into the pushing portion 22 from below.

Therefore, when the backrest 3 tilts backward due to locking, the seat 2 moves forward, and when the body pressure of the seated person on the backrest 3 is released , the backrest 3 returns to the neutral posture and the seat 2 moves backward. A resin slider 23 is attached to the upper end of the passive arm 22. Slider 23 is in the form close to a circle in a side view, the axis is substantially coincident with the rotation axis of the movable base 15 (hence, can be flipped up in the absence of twisting the movable base 15 .)

(2). Fixed base and support frame mounting structure / elevating mechanism The fixed base 8 has a generally planar shape close to a square, and the left and right support frames 9 are fixed thereto. 1 and 2, the left and right support frames 9 appear to be outwardly convexly curved when viewed from the front, but this is because they appear to be curved backwardly as viewed from the side as shown in FIG. Therefore, in practice, as shown in FIG. 7A, it is substantially L-shaped in a front view having a lower horizontal portion and a vertical portion.

  For example, as shown in FIG. 4A, the center bracket 25 is fixed to the inside of the fixed base 8 by welding so that an upper and lower space is provided between the fixed base 8 and the bottom plate of the rear half. The bush 26 is fixed to the fixed base 8 and the center bracket 25, and the upper end of the leg support 4 is inserted into the bush 26 from below.

As shown in FIG. 3, although the fixed base 8 is in a cross section square to the lower horizontal portion 9b that constitute the lower end of the left and right support frame 9, rectangular projection of reduced both the front and rear width and vertical width 9c is provided, and the protrusion 9c is inserted into the lateral hole 27 provided in the fixed base 8. Screws (not shown) penetrating from below into the fixed base 8 are screwed into the protrusions 9c. Therefore, the protrusions 9c are fixed to the fixed base 8 so that they cannot be removed. It may be fixed by welding.

  The protrusion 9c is positioned so as not to move up and down by the fixed base 8 and the center bracket 23, and is moved back and forth by front and rear inward side pieces 8b (see also FIG. 5A) provided on the fixed base 8. The position is regulated.

  It is possible to integrally mold the fixed base 8 and the left and right support frames 9 with an aluminum die cast or a resin molded product. In this case, however, a very large mold is required and flexibility in design change is possible. There is also a bad problem. On the other hand, when the fixed base 8 and the left and right support frames 9 are configured as separate members as in the present embodiment, the support frame 9 can be manufactured with a mold having a general size, and the fixed base 8 and the support base 9 are supported. There is an advantage that the design change of the frame 9 can be easily handled.

For example, as shown in FIGS. 3 and 4, the fixed base 8 is covered with a cover 28 that covers the whole. The lid 28 is made of resin and fitted to the front and rear of the claw 28a (see FIG. 3 (A)), the engaging hole 8c provided on the front and back plate of the fixed base 8 (see FIG. 5 (A)). The lid 28 can be made of aluminum die cast, and can be fixed to the fixed base 8 with screws.

At the front portion of the lid 28 , a horizontally elongated ridge 29 is provided as a seat support portion that supports the seat via the movable base 15 . A dent 30 is formed on the upper end of the ridge 29, leaving the left and right ends thereof. Therefore, the movable base 15 is supported in two left and right positions. A large number of ribs 31 are provided on the inner surface of the ridge 29, and the ribs 31 are supported by the flange 8 a of the fixed base 8. For this reason, even if it is a big load, it is supported exactly. As shown in FIG. 1A, the movable base 15 is provided with a groove 15a into which the protrusion 29 is fitted.

As shown in FIGS. 3 to 5, the fixed base 8 includes an operation rod 32 that constitutes a manual operation tool for manually adjusting the height of the seated person and a movable base 15 that is flipped up. And an automatic raising lever 33 for automatically raising the height to the maximum height. The operation rod 32 constitutes a main part of the manual operation means, and the automatic raising lever 33 constitutes an operating member of the automatic raising device .

The operation rod 32 is made of a metal round bar. For example, as is apparent from FIG. 6B, an outward laterally long part 32b is provided at the front end of the longitudinal longitudinal part 32a, and an inward laterally long side is disposed at the rear end of the longitudinal longitudinal part 32a. It has a crank-like appearance provided with a portion 32c. Then, the outward horizontal portion 32b is protruded to the outside of the fixed base 8, that have this attachment only 34 pinched with a finger rest. It is also possible to unlock the leg support 4 with a wire. In this case, the knob 34 can be provided on the seat 2.

  The front / rear longitudinal part 32a is pressed and held by a resin bearing holder 35. Therefore, the operation rod 32 rotates about the axis of the front / rear longitudinal part 32a. The front end portion of the inwardly long lateral portion 32 c in the operation rod 32 is flattened and is positioned on the lock release valve 36 in the leg column 4. Accordingly, when the operation rod 32 is pulled upward, the lock release valve 36 is pushed downward, whereby the lock of the leg support 4 is released and the fixed base 8 is raised. The outwardly long horizontally extending portion 32 b of the operation rod 32 is fitted in a vertically elongated elongated hole 37 provided on the side plate of the fixed base 8. For this reason, the operating rod 32 is held so that it cannot be displaced forward and backward.

The automatic raising lever 33 has a shape that is long in the front-rear direction, and its rear end portion is a gas cylinder operation portion 33e, which is located directly above the lock release valve 36 and above the tip of the inwardly long lateral portion 32c of the operation rod 32. doing. Therefore, when the rear end of the automatic raising lever 33 is lowered, the lock release valve 36 is pushed down via the operation rod 32. It is also possible to employ a structure in which a rotating intermediate member for pushing down the unlocking valve 36 is provided on the fixed base 8 and this intermediate member is individually pressed by the operating rod 32 and the automatic raising lever 33. is there.

The bearing holder 35 includes a first bearing portion 35a for rotatably holding the operation rod 32, a second bearing portion 35b having a rearward opening in which the automatic raising lever 33 is fitted, and a lower spring receiving portion 35c. The screw 42 is fixed to the center bracket 23. The first bearing portion 35a and the second bearing portion 35b of the bearing holder 35 overlap the upper surface of the center bracket 23, but the lower spring receiving portion 35c is stepped downward, and the lower spring receiving portion 35c It overlaps from above with a forward facing lower piece 23 a provided at the front end of the center bracket 23. The forward facing lower piece 23 a of the center bracket 23 overlaps the bottom surface of the fixed base 8.

On the left and right inner surfaces of the second bearing portion 35b in the bearing holder 35, as shown in FIG. 5B, there are bearing slots 38 that do not penetrate upward, while the automatic raising lever 33 has An oval bearing projection 33a that fits into the bearing groove 38 of the second bearing portion 35b is provided to project laterally. Then , as shown in FIG. 6 (B), the automatic raising lever 33 is turned upside down and turned in the reverse direction, and then the bearing protrusion 33a is fitted into the second bearing portion 35b , and then the automatic raising lever 33 is raised to the front side. The raising lever 33 can be set on the bearing holder 35. Further, the automatic raising lever 33 is rotatable around the axis of the bearing projection 33a. Therefore, in the automatic raising lever 33, the bearing projection 33a is a pivot point.

An upper spring receiving portion 33b that opposes the lower spring receiving portion 35c of the bearing holder 35 is provided on the front side of the bearing protrusion 33a in the automatic raising lever 33 , and between the upper and lower spring receiving portions 33b and 35c. Further, a compression coil spring 40 as an example of a spring means is interposed. Accordingly, the automatic raising lever 33 is urged by the spring 40 in the direction in which the lock release valve 36 is pushed down by the gas cylinder operating portion 33e . Boss portions 33c and 35d are provided on the upper and lower spring receiving portions 33b and 35c to prevent the spring 40 from shifting.

Then, the front end of the automatic lift levers 33 are provided with a pressed portion 33d of the upwardly projecting a downward load of the movable base 15 is applied, the defeat movable base 15, of the movable base 15 groove line The pushed portion 33d of the automatic raising lever 33 is pushed by the pushing portion 15b at the rear edge of 15a, the pushing action of the lock release valve 36 by the automatic raising lever 33 is released, and the seat 2 is raised. Since the gas cylinder operating portion 33e of the automatic raising lever 33 is located on the tip of the inward portion 32c of the operating rod 32, the operability of the operating rod 32 in the state where the seat 2 is tilted is not hindered.

The lid 28 covering the fixed base 8 has a hole 41 for exposing the upward portion 33d of the automatic raising lever 33 on the lid 28. The hole 41 is open so as to be hidden behind the ridge 29, and the upward portion 33d and the ridge 29 are set to have substantially the same height when the movable base 15 is flipped up. . For this reason, an object is not caught by the upward part 33d, or appearance does not deteriorate.

When the movable base 15 is flipped up, the lock release valve 36 is pushed down by the spring 40 via the automatic raising lever 33, and thereby the fixed base 8 is raised. Therefore, the fixed base 8 can be automatically raised no matter where the hand is placed and jumped up on the movable base 15 without requiring a lever operation. As already described, the inner cylinder and the outer cylinder of the leg device 1 are relatively rotated with the automatic elevation, and the leg device 1, the seat (the seat 2 and the movable base 15 ), the backrest, and the back 3 are viewed in plan view. relative orientation is held in the nestable reference attitude.

Since the rotation stroke of the automatic raising lever 33 is small, in the present embodiment, the fixed base 8 is raised at the initial stage when the movable base 15 is flipped up and rotated. Further, when the movable base 15 is tilted, the lock of the leg device 1 is released at the final stage.

Since the spring 40 pushes the movable base 15 in the flip-up direction, the elastic force of the spring 40 is preferably as small as possible from the viewpoint of the stability of the movable base 15 . In this regard, the lever action by the automatic raising lever 33 should be made as large as possible (the automatic raising lever 33 can be arranged in a posture that is long in the diagonal direction of the fixed base 8). Further, the lifting operation means and the automatic lifting means do not need to be of a lever type, and it is possible to use a cable conduit in which a wire is slidably inserted into a tube.

(4) Leg device In the present embodiment, the leg device 1 is also improved. This point will be described next. While leg system 1 has a Edaashi 6a, 6b of the two each before and after, in the present embodiment, Kakuedaashi 6a, base of 6b has become the same height, the central cylinder at the same height Branches from the upper end of 5.

  In order to enable front and rear nesting, as shown in FIG. 7B, the left-right distance between the front ends of the front branch legs 6a is made smaller than the left-right distance between the front ends of the rear branch legs 6b. As shown, the front branch leg 6a is inclined in a substantially straight line when viewed from the side, and the rear branch leg 6b is curved such that it is swollen upward in the side view. Since the branch legs 6a and 6b have such a side view shape, it is allowed that the front branch leg 6a of the chair positioned behind greatly enters the lower side of the rear branch leg 6a in the chair positioned forward. Yes.

  And since each branch foot 6a, 6b has the same base height, the aesthetics are remarkably excellent compared with what varied height. The rear branch leg 6b is longer in length than the front branch leg 6a. However, the rear branch leg 6b has an arch structure swollen upward, so that high strength can be maintained. The front and rear branches 6a and 6b can be reversed, but in order to prevent the user's legs from getting in the way, the front branches 6a and 6b are not provided as in the embodiment. It is preferable to use a short and inclined posture. Although not shown, a resin cushioning material for preventing any one or both of the front branch foot 6a and the rear branch foot 6b from being damaged by a collision when nesting is performed. Is provided.

(4). Others The present invention can be embodied in various ways other than the above embodiment. For example, the form of the seat and the backrest can be arbitrarily set as necessary. Various spring bodies (elastic bodies) such as a torsion bar, a leaf spring, and rubber can be employed as spring means for imparting resistance to the back tilt of the backrest and the movement of the seat. It is also possible to provide locking means such as a gas cylinder for controlling the back tilt posture of the backrest. The backrest or the seat may have a structure in which a flexible sheet material such as a mesh is stretched around a frame material constituting the outer periphery of the backrest or the seat.

  Although the support frame can be referred to as an intermediate support, the backrest and the seat (movable base) can be attached to separate intermediate supports. That is, it is possible to separately provide an intermediate support for the backrest and an intermediate support for the seat. The manual operation tool does not necessarily have to be a rotary type, and may be a push button type or a rotary type (rotary type).

The present invention can be manufactured by embodying a chair. Therefore, it can be used industrially.

1 leg device 2 seat 3 backrest 4 leg support (gas cylinder)
6 branch foot 7 caster 8 fixed base 9 support frame constituting intermediate support 12 upper connecting portion
15 fixed base
15a groove
15b Pressing portion 18 Lower connecting portion 28 Lid 29 Projection 32 Operating rod constituting manual operating tool 33 Automatic raising lever as an example of operating member
33a Protrusion that constitutes the pivot point
33d Pressed part
33e Gas cylinder operation part 34 Rotating knob constituting a manual operation tool 36 Lock release valve 40 Spring (spring means, elastic body)
Rotating fulcrum of O (18) seat (movable base)

Claims (3)

A leg device having a leg column composed of a gas cylinder that is free to expand and contract when unlocked, a fixed base provided at the upper end of the leg column, and the fixed base or a support frame provided on the fixed base. a backrest, have said fixed base or support frame or flipped back pivotally mounted seat and when set to a higher bouncing the seat be fitted a plurality in the longitudinal are allowed ,
And, when the a flipping the pre Symbol seat locking gas cylinder tilts the seat instead of the free state is released and the automatic increase device for changing the gas cylinder in the locked state, the operation of the seated person in a state in which defeated the seat And a manual operation tool capable of releasing the lock of the gas cylinder is provided,
The automatic lifting device includes an operating member biased by a spring means so that the gas cylinder is held in a free state. When the seat is tilted, the operating member moves against a spring force. Therefore, the gas cylinder is configured to shift to the locked state ,
The actuating member is connected to the fixed base so that one end and the other end of the actuating member move up and down to rotate in a seesaw shape, and a gas cylinder is disposed on one side of the actuating member with a rotation fulcrum interposed therebetween. Provided with an operation part, on the other side across the rotation fulcrum, a spring receiving part and a pressed part to be pushed downward by the seat are provided,
And the rotation fulcrum of the said seat is located behind the said leg support | pillar, and the said operation member is arrange | positioned in front of the rotation fulcrum of the said seat,
Chair. The actuating member is arranged in a longitudinally longitudinal posture at a site in front of the leg strut, and rotates up and down with a site between the front end and the rear end as a fulcrum. A gas cylinder operation part is formed at the end, and the pressed part is formed at the front end of the operating member.
The chair according to claim 1. The fixed base is overlaying the upper lid in the opened box-like form came upward, while the left and right horizontal ridges for supporting the seat to the front end portion of the lid is formed,
The pressed portion of the actuating member in the automatic lifting device is in an upward posture and is disposed so as to be close to the rear end edge of the ridge in plan view, and is behind the ridge of the lid and the ridge. Is provided with a hole through which the pressed portion is exposed,
On the lower surface of the seat or the movable base to which the seat is attached, a pressing portion that presses the pressed portion below the upper end of the ridge is formed.
The chair according to claim 2.

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