JP2002034696A - Chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chair which can assist an user with declining muscle strength of legs to sit down on it and to stand up from it. SOLUTION: The chair is provided with a base 1, a seatback 24, connected to a back end of the base in a manner that a lower part of the seatback can rotate, a seat 11, which is located in front of the seatback and is equipped on the base as the seat can rotate in a rising direction of the back end side of the seat, and a driving system 40, which drives the backseat back and forth while using the lower part of the backseat as a supporting point, drives the seat in a rising direction of the back end of the seat, and has a driving source 34.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair suitable for use by a person with reduced muscle strength in the legs and hips.

[0002]

2. Description of the Related Art It is not easy for a user with weak muscular strength to sit or stand on a chair, and assistance from an assistant may be necessary. However, it is not easy for the caregiver to raise or sit down the user who has weak muscles in the legs and hips, and it is desired to reduce the burden on the caregiver.

In general, a chair has a seat for a user to sit on. This seat is usually provided substantially horizontally on the leg. Therefore, when sitting on the seat body,
Since the user has to lower the buttocks deeply to the height of the seat body, the operation places a heavy burden on the legs and hips.

[0004] When the user stands up, the user must lift the buttocks which have been deeply lowered on the seat body, and also have to extend the legs from the bent state, which places a greater burden on the user than sitting.

[0005] In order to reduce the burden on the caregiver when the user sits on a chair or stands up, a Japanese utility model 61-3
No. 401 proposes a chair. In this chair, the seat body is provided rotatably around the front end side,
The seat body is urged by a spring in a direction in which the rear end rises with the front end serving as a fulcrum.

The seat body can be held substantially horizontally against the urging force of the spring. Therefore, when the user sits down, the holding state of the seat body is released, and the seat body is inclined by the urging force of the spring. Thereby, the user can relatively easily sit down by slightly lowering the buttocks and hitting the above-mentioned seat body, and when standing up, the buttocks are pushed up by the seat body urged in the ascending direction. Therefore, in this case, it is possible to stand up relatively easily.

[0007]

By the way, in the chair having the above structure, the seat body is urged in the rising direction by the urging force of the spring. Therefore, in order for the user to be able to stand up relatively easily, the urging force of the spring must be increased to push the buttocks of the user strongly. In addition, even when the user sits down, the urging force of the spring must be sufficiently increased to ensure that the user's buttocks can be received.

However, if the urging force of the spring is increased, the seat body must be strongly pressed against the urging force of the spring with the buttocks when sitting down. May increase the burden on the user.

Further, if the holding state of the seat body is released when the user stands up, the buttocks of the user are strongly pushed up by the seat body in accordance with the urging force of the spring. In the case of, the stability when standing up due to swaying of the legs and the like may be deteriorated.

[0010] On the other hand, a so-called reclining chair is known, in which the upper body can be tilted backward and the legs can be held almost horizontally so that the user can relax while sitting. In a reclining chair, it is convenient if the seat body is rotatably provided to reduce the burden on the user or caregiver when the user with weak muscles of the legs and legs stands up or sits down. However, such reclining chairs have not been developed.

According to the present invention, the user can sit and stand up relatively easily without strongly urging the seat body in the ascending direction by the spring, and furthermore, the user can easily move the upper body backwards. An object of the present invention is to provide a chair that can take a posture.

[0012]

According to the first aspect of the present invention, there is provided a base, a back body provided at the rear end side of the base so as to be pivotable in the front-rear direction with a lower portion serving as a fulcrum, and a back body provided in front of the back body. And a seat body rotatably provided in a direction in which a rear end side of the base body rises, and the back body is driven in a rotation direction with a lower portion serving as a fulcrum, and the rear end of the seat body rises. A driving mechanism having a driving source for driving in a direction.

According to a second aspect of the present invention, there is provided a base, a back body provided at the rear end side of the base so as to be rotatable in the front-rear direction with a lower portion serving as a fulcrum, and A seat body rotatably provided in the direction in which the rear end rises, a footrest body provided rotatably with the upper part as a fulcrum on the front end of the base, and a rear end of the seat body ascending And a drive mechanism having a drive source for driving the footrest in a pivoting direction with the upper part as a fulcrum and rotating the back body in conjunction with the movement of the footrest. And there is a chair.

According to a third aspect of the present invention, the footrest is suspended before the seat is driven in the upward direction, and the rear end of the seat is raised by the driving mechanism. 3. The chair according to claim 2, wherein the lower portion rotates toward the rear end side of the base with the upper portion serving as a fulcrum when rotated in the direction.

According to a fourth aspect of the present invention, the driving mechanism comprises: a rotating shaft provided on the front end side of the base so as to be rotatable along a width direction of the base; and a driving arm provided on the rotating shaft. And a drive source connected to the drive arm; and a lift provided on the rotary shaft, which pushes up the seat body in a direction in which a rear end side of the rotary body is raised when the rotary shaft is rotated in a predetermined direction by the drive source. An arm, a first foot link having one end connected to the rotation shaft, one end pivotally connected to the other end of the first foot link, the other end pivotally connected to the footrest, and A second foot-side link for driving the footrest in the ascending direction via the first foot-side link by the rotation when rotated by the drive source in a direction opposite to the predetermined direction; And the other end to the lower end of the back body Provided Te is the chair according to claim 2, characterized by including a coupling link for rotating the back body lodging direction when driving the foot connector carrier in the upward direction.

According to a fifth aspect of the present invention, the drive source has a drive shaft that is driven forward and backward in the axial direction from a neutral position, and the drive shaft is driven in the forward direction from the neutral position to thereby rotate the rotary shaft. The chair according to claim 4, wherein the chair is configured to rotate in the predetermined direction and to be driven in a retreating direction from a neutral position to rotate the rotation shaft in a direction opposite to the predetermined direction.

According to a sixth aspect of the present invention, the driving mechanism comprises a rotating shaft provided rotatably along a width direction of the base on a front end side upper portion of the base, and a driving arm provided on the rotating shaft. And a drive source connected to the drive arm; and a lift provided on the rotary shaft, which pushes up the seat body in a direction in which a rear end side of the rotary body is raised when the rotary shaft is rotated in a predetermined direction by the drive source. An arm, a first interlocking link having one end connected to the rotation shaft, and one end pivotally connected to the other end of the first link and the other end pivotally connected to a lower end of the back body. 2. The chair according to claim 1, further comprising a second interlocking link for rotating the back body in a falling direction when a rotation shaft is driven in a direction opposite to the predetermined direction by the driving source.

According to the present invention, since the seat is driven by the drive source of the drive mechanism, the seat can be reliably rotated at a predetermined speed, so that the user can sit in a stable state. The user can sit up and stand up, and the back body can be driven in the front-back direction, so that the seated user can take a comfortable posture in which the upper body is tilted backward.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 12 show a first embodiment of the present invention. The chair shown in FIGS. 1 to 3 includes a base 1. This base 1 is, as shown in FIG.
And a pair of leg members 3 connected in parallel at a predetermined interval by a predetermined distance. Rollers 4 are rotatably provided at the rear ends of the leg members 3, respectively. A frame 5 is erected on each leg member 3, and a front end and a rear end of an upper portion of the pair of left and right frame 5 are connected by an upper connection member 6 in the form of a rectangular tube.

A pair of seat frame mounting pieces 7 are fixed to the upper surfaces of both ends of the upper connecting member 6 upward.
Foot mounting frame mounting pieces 8 are respectively provided on the outer sides of the seat frame mounting pieces 7 at both ends of the upper connecting member 6 so as to protrude forward. Support piece 9 is fixed rearward.

The pair of seat frame attachment pieces 7 includes a seat body 11.
Are connected rotatably. That is, a pair of connecting pieces 13 are provided at the front end of the seat frame 12, and these connecting pieces 13 are rotatable by the screws 15 and the nuts 15a via the bushes 14 on the seat frame mounting piece 7 as shown in FIG. Are linked.

At the front and rear end portions of the lower surface on both sides of the seat frame 12, cushioning members 16 made of an elastic material such as rubber are provided. When the seat frame 12 is in a substantially horizontal state, the cushioning members 16 come into contact with the upper surfaces of a pair of receiving members 18 provided along the front-rear direction inside the upper portion of the frame 5. In addition, the seat body 11 is, as shown in FIG.
2 is provided with a cushion body 17 on the upper surface.

The pair of footrest frame mounting pieces 8 are pivotally mounted on both sides in the width direction of the upper end of a footrest frame 22 constituting the footrest body 21. The footrest frame 22 is connected to the base 1 so as to be rotatable in the front-back direction with the upper end serving as a fulcrum. The footrest frame 22 is provided with a cushion body 23 as shown in FIG.

A lower end of a back frame 25 forming a back body 24 is rotatably connected to an upper portion of the base 1 on the rear end side of the frame 5. That is, as shown in FIG. 10, one end of the short pipe 26 is fixed to the upper inner surface on the rear end side of the frame body 5,
On both sides of the lower end of the back frame 25, connecting pieces 27 are protruded. A bush 28 is provided on the connecting piece 27, and the screw 2
9 is screwed to a nut 30 fixed in the other end of the short pipe 26, whereby the back frame 25 is connected to the base 1 so as to be rotatable in the front-rear direction. The back body 24 is configured by providing a cushion body 31 on a back frame 25 as shown in FIG.

As shown in FIGS. 4 and 7, both ends of the rotating shaft 32 are rotatably supported by the pair of supporting pieces 9 respectively. A pair of drive arms 33 are fixed at predetermined intervals in the middle of the rotating shaft 32. The tip of a drive shaft 35 of a drive source 34 is pivotally attached to the drive arm 33. The drive source 34 is one element of the drive mechanism 40.

As shown in FIGS. 1 and 7, the drive source 34 moves the drive shaft 35 from the neutral position shown in FIG. 1 to the forward position shown in FIG. Power conversion unit 37 driven to the retracted position shown in FIG.
It is composed of The drive source 34 is pivotally attached to a connecting piece 38 provided on the lower connecting member 2 on the rear end side of the base 1.

4 and 7 are provided at both ends of the rotary shaft 32.
As shown in FIG. 7, the base ends of the lifting arms 41 are fixed. As shown in FIG.
A support shaft 42 is provided at the front end of the device 1. A roller 43 is provided on the support shaft 42 so as to be rotatable and cannot be pulled out.
Each roller 42 comes into contact with a pair of L-shaped members 44 provided in the widthwise middle portion of the seat frame 12 along the front-rear direction. That is, when the drive shaft 35 of the drive source 34 is driven in the forward direction from the neutral position shown in FIG. 1, and the drive shaft 35 rotates the rotary shaft 32 through the drive arm 33 in a predetermined direction, Lifting arm 41
Is driven in the ascending direction (clockwise direction indicated by the arrow in FIG. 2), the seat frame 12, that is, the seat body 11, is supported by the roller 43 at the connecting portion with the seat mounting piece 7 as a fulcrum, as shown in FIG. 1. As shown in FIG. 2, the rear end is rotated in the upward direction.

As shown in FIG. 1 and FIG.
One end of the first foot link 45 is fixed to the middle part of the first link. One end of a second foot link 46 is pivotally connected to the other end of the first foot link 45. The other end of the second foot-side link 46 is pivotally connected to a first connecting piece 47 provided at an intermediate portion in the vertical direction at one widthwise end of the lower surface (back surface) of the footrest frame 22 of the footrest 21. Is being worn.

The footrest 21 is provided with a drive shaft 3 of a drive source 34.
When 5 is in the neutral position, it is hanging substantially vertically as shown in FIG. In this state, when the drive shaft 35 is driven in the forward direction as shown in FIG. 2 and the rotation shaft 32 rotates in a predetermined direction (clockwise) indicated by an arrow, the footrest 21 is moved to the first and second foot-side links. The lower end rotates to the rear end side of the base 1 with the connection portion with the footrest mounting piece 8 as a fulcrum by the 45 and 46. At this time, as described above, the seat body 11 rotates in the direction in which the rear end rises with the front end as a fulcrum.

As shown in FIG. 3, when the drive shaft 35 is driven in the backward direction from the neutral position and the rotation shaft 32 rotates counterclockwise, which is the opposite direction to the above-mentioned predetermined direction indicated by an arrow, Reference numeral 21 rotates in a direction in which the lower end rises forward. When the drive shaft 32 is driven in the backward direction from the neutral position in FIG. 1, the roller 43 provided on the sitting arm 41 separates from the L-shaped member 44 of the seat frame 12, but the seat body 11 is substantially horizontal. In this state, the cushioning material 16 provided on the lower surface abuts on the upper surfaces of the pair of receiving members 18, so that the rear ends are prevented from further rotating in the downward direction.

As shown in FIG. 4 and FIG.
A second connecting piece 48 is provided at the other end in the width direction of the lower surface (back surface) of the footrest frame 22 at an intermediate portion in the vertical direction.
One end of an interlocking link 49 is pivotally connected to the second connecting piece 48. The other end of the interlocking link 49 is connected to the back frame 2
5, a third connecting piece 51 provided at a lower half of the lower end in the width direction.
Is pivoted to.

As shown in FIG. 1, when the drive shaft 35 of the drive source 34 is in the neutral position, that is, when the footrest 21 is suspended substantially vertically, the back body 24 is pivotally supported by the connecting piece 27. Is held by the interlocking link 49 in a state where the upper end side is slightly inclined backward from the vertical state with the fulcrum as a fulcrum.

As shown in FIG. 2, when the drive shaft 35 is driven in the forward direction and the footrest 21 rotates rearward with the upper end as a fulcrum, the back body 24 is interlocked with the rotation of the footrest 21. Since the lower end is pushed backward by the link 49,
It rotates in the upright direction that is more vertical than the state shown in FIG.

As shown in FIG. 3, when the drive shaft 35 is driven in the retreating direction, the footrest 21 rotates in the direction in which the lower part rises with the upper end as a fulcrum. As a result, the lower end is pulled forward, and the upper end pivots in the direction of falling down rearward.

The lifting arm 41, the first and second foot side links 45 and 46, and the interlocking link 49 are connected to the drive source 3
4 constitutes the driving mechanism 40 for driving the seat body 11, the footrest body 21, and the back body 24.

As shown in FIGS. 1 to 3, side bodies 52 which can be used as armrests are provided on both sides of the base 1 in the width direction.

Next, a case where the chair having the above-mentioned structure is used will be described.

When the user with weak muscle strength of the legs and hips is seated, the drive shaft 35 of the drive source 34 is driven in the forward direction from the neutral position as shown in FIG. Thereby, the seat body 1
1 is driven from a substantially horizontal state shown in FIG. 1 to an inclined state in which the rear end side rises as shown in FIG. Therefore,
The user can touch the seat body 11 without lowering the buttocks deeply. When the buttocks are applied to the seat body 11, the drive shaft 35 is returned from the forward position to the neutral position shown in FIG. As a result, the seat body 11 gradually rotates in the falling direction from the inclined state in accordance with the driving speed of the drive shaft 35, so that the user can shift to the sitting posture while gently bending the legs. That is, the user can shift from the standing posture to the sitting posture without placing a great burden on the legs and hips.

When the user drives the drive shaft 35 of the drive source 34 in the backward direction from the neutral position as shown in FIG. 3 with the user sitting on the seat body 11, the rotation shaft 32 and the first and second feet From the state where the footrest 21 is suspended substantially vertically via the side links 45 and 46, the footrest 21 rotates in a direction in which the lower end rises.

When the footrest 21 rotates in the ascending direction, the lower end of the back body 24 is pulled forward by the interlocking link 49, so that the back body 24 rotates in the direction in which the upper side falls backward.

Accordingly, the user sitting on the seat body 11 is held by the footrest 21 with the legs lifted, and can lean on the back body 24 with the upper body leaned backward. That is, the user can take a comfortable posture in the sitting state.

On the other hand, when the user sitting on the seat body 11 in the state shown in FIG.
5 is driven from the retracted position through the neutral position shown in FIG. 1 to the advanced position shown in FIG.

When the drive shaft 35 returns from the retracted position to the neutral position, the footrest 21 hangs down substantially vertically, and the back body 24 pivots forward to a position where it falls slightly backward from the vertical state. In this state, the user can put his foot on the floor.

Next, the drive shaft 35 of the drive source 34 is driven in the backward direction from the neutral position as shown in FIG. Accordingly, the seat body 11 is rotated by a roller 43 provided on the sitting arm 41 in a direction in which the rear end side is raised with the front end side as a fulcrum, and the lower end of the footrest 21 is substantially perpendicular to the base 1. It rotates to enter backward.

When the seat body 11 is driven in the ascending direction, the user seated on the seat body 11 pushes the buttocks obliquely upward. The rotation of the seat body 11 in the ascending direction is
Since the user gradually rotates in the ascending direction in accordance with the driving speed of the drive shaft 35 of the drive source 34, the user can shift from the sitting posture to the standing posture while gradually extending the bent leg. That is, the user can stand up gently and with the buttocks securely supported by the seat body 11, so that the user can stand up in a stable state without imposing a heavy load on the legs and hips.

Further, when the user stands up by raising the seat body 11, the footrest 21 rotates in a direction in which the lower end enters the rear of the base 1. Therefore, when the user stands up, the legs do not hit the footrest 21, so that even if the footrest 21 is provided, the user can stand up in a stable state.

The drive shaft 35 of the drive source 34 is driven from the neutral position to the forward position or the retracted position, and the rotation shaft 32 is rotated in a predetermined direction. Can be linked to each other in a predetermined state, or the foot rest 21 and the back body 24 can be linked to each other in a predetermined state. That is, since the seat body 11, the footrest body 21, and the back body 24 can be driven by a single driving source 34 in a predetermined interlocking relation, the configuration can be simplified and the cost can be reduced as compared with the case of driving using a plurality of driving sources. Reduction can be achieved.

FIGS. 13A to 13C show a second embodiment of the present invention. This embodiment is the same as the first embodiment in that the seat body 11 is rotated by the drive source 34, but the footrest 21 is not provided, so that the back body 24 is The second embodiment differs from the first embodiment in that it can be driven by the drive source 34 regardless of the movement of the motor 21.

That is, instead of the first foot link 45 of the first embodiment, a pair of first drive links 6 spaced at a predetermined interval in the axial direction of the rotary shaft 32 are provided on the rotary shaft 32.
1 (only one is shown) is provided with one end connected.
The other end of the first drive link 61 is pivotally connected to one end of a second drive link 62 instead of the interlocking link 49 of the first embodiment. The other ends of the pair of second drive links 62 are pivotally connected to a pair of third connection pieces 51 that are vertically provided at the lower end of the back frame 25.

In the second embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In such a configuration, when the drive shaft 35 of the drive source 34 is at the neutral position as shown in FIG. 13 (a), the seat body 11 is lying down substantially horizontally and the back body 24 is slightly It is inclined backward.

As shown in FIG. 13 (b), when the drive shaft 35 is driven in the forward direction, the seat 11 is rotated in the direction in which the rear end rises. At this time, the first drive link 6
The first and second drive links 62 bend from the inverted letter shape shown in FIG. 13 (a) to the letter shape shown in FIG. 13 (b), but only the bending direction is reversed. Since the bending angles are substantially the same, the standing angle of the back body 24 hardly changes.

When the drive shaft 35 is driven from the neutral position shown in FIG. 13 (a) in the retreating direction shown in FIG. 13 (c), the seat body 11 is not driven in the ascending direction, but is rotated. 3
By the rotation of 2, the first drive link 61 rotates in the direction of the arrow, and the bending angle formed between the first drive link 61 and the second drive link 62 decreases.

As a result, the lower end of the back body 24 is pulled forward, and the upper end side of the back body 24 largely falls rearward. Therefore, the user sitting on the seat body 11 takes a comfortable posture in which the upper body is tilted rearward. be able to.

That is, according to the second embodiment, the seat 11 can be driven by the single drive source 34 and the back 24 can be driven without providing the footrest 21. In addition to assisting the person in sitting and standing up to perform the movement in a reliable and stable state, the back body 2 in the seated state
4 can be tilted backward to take a comfortable posture.

[0057]

According to the present invention, the seat body is driven by the drive source of the drive mechanism so that the seat can be turned from the down state to the upright state or from the upright state to the down state. .

[0058] Therefore, the seat body can be surely rotated at a predetermined speed by the driving source, so that when the user stands up, the buttocks can be pushed up steadily and gently in a stable state. At times, the buttocks may be applied to the seat body to allow the user to sit gently in a stable state together with the seat body. Moreover, since the back body can be driven in the front-rear direction, the user sitting on the seat body can take a comfortable posture in which the upper body is tilted backward.

[Brief description of the drawings]

FIG. 1 is a side view of a chair according to a first embodiment of the present invention, in which a drive shaft of a drive source is at a neutral position.

FIG. 2 is a side view of the chair in which a drive shaft of a drive source is at an advanced position.

FIG. 3 is a side view of the chair in which a drive shaft of a drive source is at a retracted position.

FIG. 4 is a perspective view showing a driving mechanism provided on a base.

FIG. 5 is a front view showing a schematic configuration of a chair excluding a drive source and a mechanism for driving a back body among the drive mechanisms.

FIG. 6 is a front view showing a schematic configuration of a chair showing a drive source and a mechanism for driving a back body among the drive mechanisms.

FIG. 7 is a plan view showing a schematic configuration of a chair excluding a back body.

FIG. 8 is a plan view of a chair showing a driving source and a mechanism for driving the back body.

FIG. 9 is a plan view of a seat frame.

FIG. 10 is an enlarged sectional view of a connecting portion between the base and the back body.

FIG. 11 is an enlarged sectional view of a connecting portion between the base and the seat body.

FIG. 12 is an enlarged view showing a seat body and a sitting arm for driving the seat body in an ascending direction.

FIG. 13 is a side view of a chair showing movement of a seat body and a back body according to the second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Base 11 ... Seat body 21 ... Footrest body 24 ... Back body 32 ... Rotating shaft 33 ... Drive arm 34 ... Drive source 35 ... Drive shaft 40 ... Drive mechanism 41 ... Sitting arm 45 ... First foot side link 46 ... Second foot side link 49... Interlocking link 61... First drive link 62.

Claims (6)

[Claims] 1. A base, a back body provided at a rear end side of the base so as to be rotatable in the front-rear direction with a lower part serving as a fulcrum, and a rear end side ascending to the base positioned forward of the back body And a drive mechanism having a drive source that drives the back body in the front-rear direction with the lower part as a fulcrum, and drives the seat body in a direction in which the rear end rises. A chair comprising: 2. A base, a back body provided at the rear end side of the base so as to be rotatable in the front-rear direction with a lower portion serving as a fulcrum, and a rear end side ascending to the base positioned forward of the back body A seat body rotatably provided in the direction, a footrest body rotatably provided on the front end side of the base with the upper part as a fulcrum, and driving the seat body in a direction in which the rear end side rises, A chair comprising: a driving mechanism that drives the footrest in a rotating direction with an upper portion serving as a fulcrum, and a drive mechanism that rotates the back body in conjunction with the movement of the footrest. 3. The footrest is in a hanging state before the seat is driven in the ascending direction, and the footrest is rotationally driven in a direction in which a rear end of the seat is raised by the driving mechanism. 3. The structure according to claim 2, wherein the lower portion rotates toward the rear end side of the base with the upper portion serving as a fulcrum.
The described chair. 4. The driving mechanism includes: a rotation shaft provided on an upper portion of a front end side of the base so as to be rotatable along a width direction of the base; a driving arm provided on the rotation shaft; A drive arm connected to the rotary shaft; a lift arm provided on the rotary shaft, which lifts the seat body in a direction in which a rear end of the rotary shaft is raised when the rotary shaft is rotated by the drive source; A first foot-side link having one end connected to a shaft, one end pivotally connected to the other end of the first foot-side link, the other end pivotally connected to the footrest, and the rotating shaft being driven by the drive source; A second foot-side link that, when rotated in a direction opposite to the predetermined direction, drives the footrest in the ascending direction via the first foot-side link by the rotation; and one end pivotally connected to the footrest. The end is pivotally attached to the lower end of the back body. Claim 2 chair, wherein by comprising a coupling link for rotating the back body lodging direction when driving the Kiashi connector carrier in the ascending direction. 5. The drive source has a drive shaft that is driven forward and backward from a neutral position in an axial direction. The drive shaft is driven in a forward direction from a neutral position to rotate the rotary shaft in the predetermined direction. The chair according to claim 4, wherein the rotating shaft is rotated in a direction opposite to the predetermined direction by being driven in a backward direction from the neutral position. 6. The driving mechanism includes: a rotating shaft provided on the front end side upper portion of the base so as to be rotatable along a width direction of the base; a driving arm provided on the rotating shaft; A drive arm connected to the rotary shaft; a lift arm provided on the rotary shaft, which lifts the seat body in a direction in which a rear end of the rotary shaft is raised when the rotary shaft is rotated by the drive source; A first interlocking link having one end connected to a shaft, one end pivotally connected to the other end of the first link, and the other end pivotally connected to the lower end of the back body, for driving the rotating shaft; The chair according to claim 1, further comprising a second interlocking link that rotates the back body in the falling direction when driven in a direction opposite to the predetermined direction by a source.