JP2010162337A - Chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chair having a reclinable footrest and a reclinable backrest, wherein the footrest and the backrest can be reclined in a variety of positions by means of a simple and lightweight structure. <P>SOLUTION: A chair 1 includes: a seat 2, a reclinable backrest 3 mounted on the rear side of the seat 2, a reclinable footrest 4 mounted on the front side of the seat 2, and a reclining mechanism 5 for reclining the footrest 4 and the backrest 3 relative to the seat 2. The reclining mechanism 5 is provided with a switching mechanism 28 for switching between an interlocking state in which the backrest 3 is automatically reclined when the footrest 4 is reclined and a non-interlocking state in which the backrest 3 is not reclined even when the footrest 4 is reclined. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a chair capable of swinging a footrest portion and a backrest portion with respect to a seat portion.

For example, some chairs such as a chair-type massage machine can recline (swing) the footrest part and the backrest part with respect to the seat part.
For example, Patent Literature 1 discloses a chair provided with a drive mechanism that swings a footrest part in addition to a drive mechanism that swings a backrest part with respect to a seat part. In this chair, a traveling member travels along a guide rail by a drive mechanism, and a footrest portion connected to the traveling member traveling on the guide rail via a link mechanism swings.

JP 2007-75590 A

  By the way, when the drive mechanism for swinging the backrest portion and the drive mechanism for swinging the footrest portion are provided independently as in the chair type massage machine of Patent Document 1, the swing of the backrest portion and the swing of the footrest portion are provided. It is possible to change the chair to various postures by moving individually. However, on the other hand, a plurality of drive devices such as a drive motor are required, and there is a problem that the weight of the chair tends to increase.

  In addition, if the footrest part and the backrest part are swung with one drive mechanism for weight reduction, the footrest part and the backrest part are swung in conjunction with each other, so that the adjustable posture is greatly limited. End up. In particular, a chair such as a chair type massage machine has a need to realize various reclining postures by individually swinging the footrest portion and the backrest portion. For this reason, such a swinging mechanism in which the adjustable posture is greatly limited is not preferable.

  This invention is made | formed in view of the said situation, Comprising: It aims at providing the chair which can rock | fluctuate a footrest part and a backrest part to various attitude | positions, although it is a simple and lightweight structure. .

In order to achieve the above object, the present invention has taken the following measures.
That is, a chair according to the present invention includes a seat, a backrest that is swingably provided on the back of the seat, a footrest that is swingably provided on the front of the seat, and the footrest and backrest. A swinging mechanism that swings the part with respect to the seat part, the swinging mechanism, wherein the backrest part swings in conjunction with the swinging of the footrest part, and A switching mechanism for switching to a non-interlocking state in which the backrest portion does not swing and only the footrest portion swings is provided.

  In this way, the backrest can be swung in conjunction with the footrest, so that only one drive device such as a drive motor is required, and the swing mechanism is simple and lightweight. It becomes possible to make it a structure. Also, if the swing mechanism is switched from the interlocking state to the non-interlocking state using the switching mechanism, the footrest part and the backrest part can be swinged separately, and the footrest part and the backrest part can be It can be swung to the posture.

The swing mechanism includes a first swing mechanism that swings the footrest portion, a drive unit that drives the first swing mechanism, and a backrest portion that is driven by the first swing mechanism. It is preferable to include a second swing mechanism that moves, and a switching mechanism that temporarily restricts the driven operation of the second swing mechanism relative to the first swing mechanism.
The first swing mechanism preferably includes a first rod member that is connected to the footrest portion and is movably disposed in the front-rear direction, and the second swing mechanism includes the backrest portion. A second rod member that is connected to the first rod member and is pushed forward by a backward swing due to the weight of the backrest portion, and abuts against the first rod member from the rear in a state in which the rearward movement with respect to the first rod member is allowed. In addition, it is preferable to include a contact portion that guides the second rod member forward by following the first rod member while restricting the forward movement of the second rod member. In this case, it is more preferable that the switching mechanism has a stopper for switching the swinging mechanism from the interlocking state to the non-interlocking state by restricting the forward movement of the second rod member.

  Further, the switching mechanism is allowed to switch between the interlocking state and the non-interlocking state when the footrest part is in a position depending on the seat part, and when the footrest part swings forward from the sagging state. It is preferable that the switching is restricted, and the second rod member is formed in a hollow bottomed cylindrical shape that allows the first rod member to be inserted and removed from the front along the axis. It is preferable that the inner bottom portion is a contact portion of the second swing mechanism, and the stopper is configured to contact the opening edge of the second rod member.

In the above-described case, the second rod member includes a plurality of contact surfaces that can contact the stoppers at different positions in the front-rear direction. A configuration may be adopted in which the rocking angle of the backrest portion is switched in multiple stages by the contact.
The above-described configuration can be provided in a chair in which a massage mechanism is built in the backrest and the footrest.

  The swing mechanism preferably includes a posture fixing mechanism that fixes the posture of the backrest portion in a state in which the backrest portion is in the interlocked state, and the posture of the backrest portion in the non-interlocked state is You may be set as the structure fixed with the backrest part raised. As such a posture fixing mechanism, a lock member that protrudes toward the outside of the second rod member according to the front-rear position of the first rod member with respect to the second rod member, and a protrusion that protrudes outside the second rod member A first stopper hole that engages with a lock member to fix the backrest in a tilted position, and is formed rearwardly of the first stopper hole in the front-rear direction and is engaged with the protruding end in the non-interlocking state. In addition, it is possible to employ one having a second stopper hole for fixing the posture of the backrest portion to the raised state.

In addition, a connecting member that can move back and forth with respect to the first rod member and that connects the first rod member and the footrest portion is provided on the distal end side of the first rod member, It is good to be urged | biased toward the base end side of a 1st rod member by the elastic member arrange | positioned in a 1st rod member.
The stopper includes a protruding piece that can move through a movement path that faces in the vertical direction, and the protrusion moves to the lower end side of the movement path and comes into contact with the second rod member. The second rod member is configured to restrict the forward movement of the second rod member, and when the protruding piece is positioned on the upper side of the movement path, the protruding piece is biased upward, and the protruding piece is the movement path. It is preferable that a switching urging mechanism for switching the urging state of urging the projecting piece downward when moving downward is provided.

  According to the chair according to the present invention, the footrest portion and the backrest portion can be swung in various postures while having a simple and lightweight structure.

It is a perspective view of the chair (chair type massage machine) of the present invention. It is explanatory drawing which shows the change of the attitude | position of a chair in the case of a interlocking state. It is explanatory drawing which shows the change of the attitude | position of a chair in the case of a non-linked state. It is explanatory drawing which shows operation | movement of the rocking | swiveling mechanism in the case of an interlocking state. It is explanatory drawing which shows operation | movement of the rocking | swiveling mechanism in the case of a non-interlocking state. It is explanatory drawing of the rocking | fluctuation mechanism of 2nd Embodiment. It is explanatory drawing of the switching mechanism of 3rd Embodiment. It is explanatory drawing of the switching mechanism of 4th Embodiment. It is a perspective exploded view of the rocking mechanism of the fifth embodiment. It is a bottom view of the swing mechanism of the fifth embodiment. It is explanatory drawing which shows operation | movement of the rocking | fluctuation mechanism of 5th Embodiment in an interlocking state. It is explanatory drawing which shows operation | movement of the rocking | fluctuation mechanism of 5th Embodiment in a non-interlocking state. It is explanatory drawing of a switching urging mechanism.

“First Embodiment”
Hereinafter, the chair 1 of this invention is demonstrated based on drawing.
The chair 1 of the present invention is a chair type massage machine, a chair that can be reclined when washing hair in a beauty salon or barber, a chair or sofa that can be reclined when relaxing in the living room, or a passenger sitting on a vehicle such as an airplane or train It is used for a sheet to be used. Below, the chair 1 of this invention is demonstrated by giving the example which applied the chair 1 of this invention to the chair type massage machine also in these uses.

As shown in FIG. 1, a chair-type massage machine 1 (chair) includes a seat portion 2, a backrest portion 3 swingably provided on the back surface of the seat portion 2, and swingable on the front surface of the seat portion 2. And a swing mechanism 5 that swings the footrest part 4 and the backrest part 3 with respect to the seat part 2.
Hereinafter, the direction indicated by the symbol U in FIG. 1 is the upper direction when the chair type massage machine 1 is described, and the direction indicated by D is the lower side. Further, the direction indicated by F in FIG. 1 is referred to as the front, and the direction indicated by B is referred to as the rear. Further, the direction indicated by R in FIG. 1 is referred to as the right direction, and the direction indicated by L is referred to as the left direction. This coincides with the direction seen from the person sitting on the chair type massage machine 1.

As shown in FIG. 1 to FIG. 3, the seat portion 2 is composed of a frame body in which square members are combined in front and rear, left and right, and top and bottom. Material C is provided. A wheel 6 is provided on the lower side of the rear part of the frame body so as to be rotatable about an axis that faces in the left-right direction, thereby facilitating the transport of the chair type massage machine 1.
On the front upper side of the frame body of the seat portion 2, a footrest portion 4 is attached so as to be swingable around an axis facing in the left-right direction. A backrest 3 is attached to the rear upper side of the seat 2 so as to be swingable about an axis that faces in the left-right direction. Further, a swing mechanism 5 that swings the backrest portion 3 in conjunction with the swing of the footrest portion 4 is provided on the center side in the left-right direction of the frame body along the front-rear direction. The swing mechanism 5 will be described in detail later.

  The backrest part 3 is comprised with the frame body which combined the bar material similarly to the seat part 2, and the massage mechanism (not shown) which massages a person's shoulder, back, or waist seated inside this frame body. Is built-in. The backrest part 3 is pivotally supported on the lower end side with respect to the seat part 2, and the front surface of the backrest part 3 is tilted backward so that the front face of the backrest part 3 rises substantially vertically with the lower end side as a center. It can swing between postures.

  The footrest part 4 is comprised by the frame body which combined the bar similarly to the seat part 2 and the backrest part 3. As shown in FIG. A foot massage mechanism (not shown) is built in the distal end side frame body so that the legs of a person sitting on the chair type massage machine 1 can be massaged. The footrest part 4 is pivotally supported at the upper end side with respect to the seat part 2, and the posture where the bottom surface of the footrest part 4 hangs around the upper end side until it is parallel to the floor surface and the front surface of the footrest part 4 is It can swing between the seat 2 and a posture that has risen until it is substantially horizontal.

  The footrest part 4 is divided into two parts, a first slide member 7 on the side close to the swing center (upper end side) and a second slide member 8 on the far side (lower end side). The second slide member 8 includes a frame body that extends straight downward toward the lower front end and is bent in a substantially L shape toward the upper front side at the lower end. The above-described foot massage mechanism is provided along the frame body at the portion of the second slide member 8 bent in an L shape. The second slide member 8 is slidably attached to the first slide member 7, and the footrest part 4 can be moved close to and away from the seat part 2.

As shown in FIG. 2 or 3, the swing mechanism 5 includes a first swing mechanism 9 that swings the footrest portion 4, a drive unit 10 that drives the first swing mechanism 9, and a first swing mechanism. A second swinging mechanism 11 that is driven by a contact portion 12 with respect to the mechanism 9 and swings the backrest portion 3.
The first swing mechanism 9 includes a first rod member 13 that is arranged so as to be movable in the front-rear direction. The distal end of the first rod member 13 is pivotally connected to the second slide member 8 of the footrest portion 4 using a pivot pin 14, and the first rod member 13 is moved in the front-rear direction. The footrest part 4 can be swung.

The first rod member 13 is formed in a square bar shape, and is movable in the front-rear direction while maintaining a horizontal posture by a guide wheel 15 provided on the bottom side thereof. The rear end side of the first rod member 13 is inserted into a second rod member 22 of the second swing mechanism 11 described later.
The drive unit 10 is provided adjacent to the lower side of the first rod member 13 and swings the footrest unit 4 by moving the first rod member 13 in the front-rear direction. The drive unit 10 includes a screw shaft 16 provided along the front-rear direction, a drive motor 17 that drives and rotates the screw shaft 16 in both forward and reverse directions, and a screwing member 18 that is screwed into the screw shaft 16. Yes. On the outer peripheral surface of the screw shaft 16, a male screw portion 19 is formed in a spiral shape in the front-rear direction. The screwing member 18 is a member attached to the midway side of the first rod member 13 in the front-rear direction. The screwing member 18 extends upward and is connected to the first rod member 13 on the upper end side. It is formed in the cylinder shape which faces the front-back direction so that it can penetrate. A female screw portion 20 is formed on the inner peripheral side of the cylindrical portion so as to be screwed with the male screw portion 19 of the screw shaft 16. By rotating the screw shaft 16 in either the forward or reverse direction, the screw portion 16 is screwed. The joint member 18 is movable in the front-rear direction.

  The 2nd rocking | fluctuation mechanism 11 is provided with the 2nd rod member 22 supported by the housing 21 provided in the seat part 2 so that a horizontal movement was possible along the front-back direction. An engagement hole 24 is formed at the rear end of the second rod member 22 so as to freely engage with an engagement pin 23 provided in the frame body of the backrest 3. Thus, the second rod member 22 can move in the front-rear direction.

  The second rod member 22 has a rectangular tube shape in which the inside is hollow along the front-rear direction, and the opening is disposed toward the front, and the rear end side of the first rod member 13 is located in the inside from the front. Has been inserted. A groove 25 is formed in the lower end surface of the second rod member 22 along the front-rear direction. The groove portion 25 is formed in a slit shape that opens toward the front, and can guide the screwing member 18 provided on the lower end side of the first rod member 13 in the front-rear direction. Therefore, the first rod member 13 is inserted into the second rod member 22 so as to be movable in the front-rear direction.

  On the rear end side of the second rod member 22, there is provided an inner bottom portion 26 that contacts the rear end of the first rod member 13 inserted into the second rod member 22 and positions the insertion position. The bottom portion 26 is a contact portion 12 that operates the second swing mechanism 11 in conjunction with the operation of the first swing mechanism 9 in the present embodiment. Further, a step 27 projecting downward is formed on the rear end side of the lower end surface of the second rod member 22, and the step 27 abuts on the rear end surface of the housing 21, so that the second rod member 22 Forward movement is regulated.

The abutting portion 12 abuts the first rod member 13 from the rear in a state in which the rearward movement is permitted, and the second rod member 22 is moved to the first rod member 13 while restricting the forward movement of the second rod member 22. It follows and guides forward.
In other words, since the backrest 3 is inclined toward the upper rear side, the backrest 3 is given its own weight in the direction of swinging backward. Therefore, a force that pushes forward is applied to the second rod member 22 by backward swinging due to its own weight of the backrest portion 3, and the second rod member 22 is constantly pushed forward. It is said.

  As a result, the second rod member 22 is constantly pressed forward, and the rear end of the first rod member 13 contacts the contact portion 12. In this state, when the first rod member 13 advances, the rear end of the first rod member 13 also moves forward, and the second rod member 22 until the contact portion 12 contacts the rear end of the advanced first rod member 13. Also move forward. On the other hand, when the first rod member 13 moves backward, the contact portion 12 also moves rearward, and the second rod member 22 also moves rearward as the first rod member 13 moves backward. Therefore, if such a contact portion 12 is provided, the second rod member 22 can be guided back and forth by following the first rod member 13, and in conjunction with the operation of the first swing mechanism 9, 2 The swing mechanism 11 can be operated.

  On the other hand, since the second rod member 22 is only fitted from the rear to the rear end of the first rod member 13, moving the second rod member 22 backward relative to the first rod member 13 Is allowed. Therefore, if the forward movement of the second rod member 22 is temporarily restricted, only the first rod member 13 moves forward while the forward movement of the second rod member 22 is stopped, and the backrest 3 is temporarily swung (tilted). Only the footrest part 4 can be swung while being stopped.

  Therefore, the swing mechanism 5 of the present invention is provided with a switching mechanism 28 that temporarily restricts the driven operation of the second swing mechanism 11 relative to the first swing mechanism 9. By temporarily restricting the follow-up operation of the second swing mechanism 11 relative to the first swing mechanism 9, the backrest portion 3 swings in conjunction with the swing of the footrest portion 4, and the backrest portion 3 It can be switched to a non-interlocking state in which only the footrest part 4 does not swing but swings.

The switching mechanism 28 temporarily restricts the driven operation of the second swing mechanism 11 relative to the first swing mechanism 9. In the present embodiment, the second rod member 13 allows the first rod member 13 to move forward. A stopper that restricts only the forward movement of 22 is used as the switching mechanism 28.
The stopper 28 restricts the forward movement of the second rod member 22 when the first rod member 13 moves to substantially the middle in the front-rear direction on the movement path along the front-rear direction of the second rod member 22. In the position. The stopper 28 is provided with a plate-like protruding piece 29 that can protrude from above on the second rod member 22 side, and the protruding protruding piece 29 comes into contact with the opening edge (front end) of the second rod member 22 to make the first. The forward movement of the two-rod member 22 is restricted.

  The protruding piece 29 comes into contact with the opening edge of the second rod member 22 but protrudes so as not to contact the first rod member 13, and does not hinder the forward movement of the first rod member 13. It is attached as follows. The protruding piece 29 is attached to a swing shaft 30 provided in the left-right direction. When the swing shaft 30 is rotated, the projecting piece 29 is rotated around the axis of the swing shaft 30 so as to protrude or retract. It is like that. The swing shaft 30 is provided with a lever 31 for rotating the swing shaft 30. When the lever 31 is swung forward, the swing shaft 30 rotates in one direction and protrudes. When the piece 29 protrudes and the lever 31 is swung back, the rocking shaft 30 is rotated in the other direction so that the protruding piece 29 is retracted.

Next, the operation of the swing mechanism 5 will be described separately for the interlocked state and the non-interlocked state.
When the swing mechanism 5 is operated in the interlocked state, the chair type massage machine 1 changes from the state shown in FIG. 4A to the state shown in FIG.
In the chair type massage machine 1 shown in FIG. 4A, the footrest part 4 hangs downward with respect to the seat part 2, and the backrest part 3 falls down slightly from the vertical with respect to the seat part 2. The lever 31 is swung rearward, and the protruding piece 29 of the stopper 28 retreats from the second rod member 22 side to the housing 21 side.

In this state, when the screw shaft 16 is rotated in the forward rotation direction using the drive motor 17 of the drive unit 10, the screwing member 18 moves forward, and the footrest unit 4 moves forward in accordance with the forward movement of the first rod member 13. It swings toward (in the clockwise direction in FIG. 4).
On the other hand, when the first rod member 13 moves forward, the second rod member 22 whose forward movement is restricted via the inner bottom portion 26 (contact portion 12) also moves forward. When the second rod member 22 advances, the engagement pin 23 connected to the engagement hole 24 on the rear end side of the second rod member 22 slides forward, and the backrest portion 3 moves backward (in FIG. Oscillates in the direction of rotation.

  As shown in FIG. 4B, in the swing mechanism 5 in the interlocked state, the protruding piece 29 of the stopper 28 is retracted, and the forward movement of the second rod member 22 is not restricted by the stopper 28. . Therefore, even if the front end of the second rod member 22 advances to the stopper 28, the forward movement of the second rod member 22 is not hindered. Therefore, the second rod member 22 continues to advance following the forward movement of the first rod member 13.

  As shown in FIG. 4C, when the first rod member 13 moves to the front end of the movement path, the screwing member 18 provided on the lower side of the first rod member 13 is a frame on the front end side of the seat portion 2. The step 27 formed on the rear end side of the second rod member 22 is in contact with the body and the rear end surface of the housing 21, so that the forward movement of the first rod member 13 and the second rod member 22 is restricted. . At this time, the front end side of the first rod member 13 largely protrudes forward from the seat portion 2, and the footrest portion 4 connected to the front end side of the first rod member 13 is aligned horizontally with the seat portion 2. I'm getting up. Further, the engagement pin 23 connected to the rear end side of the second rod member 22 has moved forward from the pivot point of the backrest portion 3, and the backrest portion 3 has fallen to a position aligned horizontally with the seat portion 2. Yes. If the backrest part 3 of the chair type massage machine 1 can be swung in this way until it is horizontally aligned with the seat part 2, for example, the whole body can be stretched substantially horizontally (being on its back) to receive a massage. It is.

On the other hand, when the swing mechanism 5 is operated in an unlinked state, the chair type massage machine 1 changes from the state shown in FIG. 5A to the state shown in FIG. .
In the chair type massage machine 1 shown in FIG. 5A, the lever 31 is swung forward, and the protruding piece 29 of the stopper 28 protrudes from the housing 21 side to the second rod member 22 side. However, the tilting state of the footrest part 4 and the backrest part 3 is the same as in FIG. Therefore, the description of FIG.

  As shown in FIG. 5B, when the second rod member 22 advances to a certain extent, the opening edge of the second rod member 22 eventually comes into contact with the protruding piece 29 of the stopper 28 and the second rod member 22 moves forward. Is regulated. The second rod member 22 is restricted from moving forward with respect to the first rod member 13, but is allowed to move backward. Therefore, only the first rod member 13 moves forward while the forward movement of the second rod member 22 is restricted by the stopper 28. And only the 1st rod member 13 moves forward leaving the 2nd rod member 22, and the backrest part 3 does not rock | fluctuate from the interlocking state in which both the backrest part 3 and the footrest part 4 rock | fluctuate, and only the footrest part 4 exists. Switches to a non-interlocking state where the rocker swings. Therefore, in the state of FIG. 5A, the second rod member 22 moves forward by the distance provided between the front end of the second rod member 22 and the protruding piece 29 of the stopper 28, and the backrest portion. 3 swings. Then, when the forward movement of the second rod member 22 is stopped in the state of FIG. 5B, the swinging of the backrest 3 is also stopped.

  As shown in FIG. 5C, when the first rod member 13 moves to the front end of the movement path, the screwing member 18 provided on the lower side of the first rod member 13 is a frame on the front end side of the seat portion 2. Contact the body. And the front end side of the 1st rod member 13 protrudes largely toward the front from the seat part 2, and the footrest part 4 connected with the front end side of this 1st rod member 13 rises to the position aligned with the seat part 2 horizontally.

  On the other hand, since the second rod member 22 remains in contact with the protruding piece 29 of the stopper 28, the second rod member 22 remains in the state shown in FIG. 5B, and the backrest portion 3 has fallen obliquely backward. Kept in a state. If the backrest part 3 of the chair-type massage machine 1 can be held in such a state that it stands up with respect to the seat part 2, for example, it is possible to perform foot massage by raising the lower body horizontally while watching only the upper body and watching TV. And convenient.

  When the state shown in FIG. 4C is returned to the state shown in FIG. 4A or when the state shown in FIG. 5C is returned to the state shown in FIG. 5A, the drive motor 17 is rotated in the reverse direction. Then, the first rod member 13 is moved backward. When the first rod member 13 is moved rearward, the rear end of the first rod member 13 comes into contact with the inner bottom portion 26 of the second rod member 22, and the second rod member 22 is matched with the rearward movement of the first rod member 13. Also move backwards. As a result, the footrest part 4 swings downward, and the backrest part 3 swings in the direction in which it rises, and the chair type massage machine 1 returns to its original state.

If the swing mechanism 5 is switched from the interlocking state to the non-interlocking state using the switching mechanism 28 as described above, the swing of the backrest 3 can be performed in conjunction with the swing of the footrest 4, so that the drive motor The swinging mechanism 5 having only one drive device such as 17 can swing both the footrest portion 4 and the backrest portion 3.
Further, if the swing mechanism 5 is switched from the interlocking state to the non-interlocking state using the switching mechanism 28, the footrest portion 4 and the backrest portion 3 can be swinged separately, and the footrest portion 4 and the backrest can be separately operated. The part 3 can be swung in various postures.
“Second Embodiment”
Next, the chair type massage machine 1 of 2nd Embodiment is demonstrated.

The chair-type massage machine 1 of the second embodiment includes a plurality of contact surfaces 32 that can be contacted with the stopper 28 by the second rod member 22 at different positions in the front-rear direction. 32 differs from the first embodiment in that the swing angle of the backrest portion 3 can be switched in multiple stages by contact of any of 32.
The second rod member 22 of the second embodiment includes a step portion 33 formed along the front-rear direction on the upper outer peripheral surface corresponding to the stopper 28. The step portion 33 is opened forward so as to allow the protruding piece 29 to enter. Further, the step portion 33 is formed so as to become deeper in a stepped manner from the rear to the front, and includes a plurality of vertical surfaces that are vertically cut in different positions in the front-rear direction. The plurality of vertical surfaces are the above-described contact surfaces 32. In the present embodiment, three contact surfaces 32 including the open end of the second rod member 22 are provided.

Further, the stopper 28 is configured such that the lever 31 swings in multiple stages at every constant swing angle, and the protruding piece 29 has a second rod member as the swing angle of the lever 31 is increased stepwise. It protrudes so that the protrusion amount increases stepwise toward the 22 side.
Therefore, in the second embodiment, when the lever 31 is swung backward by the first step, the protruding piece 29 of the stopper 28 is about 1/3 of the maximum protruding amount toward the second rod member 22 side. The protruding piece 29 comes into contact with the contact surface 32 located on the rearmost side among the three contact surfaces 32. Therefore, the moving distance of the second rod member 22 required until the contact surface 32 contacts the protruding piece 29 is shortened, and the swing angle of the backrest 3 is also decreased.

  However, if the lever 31 is swung backward one more step (up to the second step), the protruding amount of the protruding piece 29 is further increased by about 1/3 of the maximum protruding amount, and the three protruding pieces 29 have three contact points. The contact surface 32 also comes into contact with the contact surface 32 located on the midway side. As a result, the movement distance of the second rod member 22 required until the contact surface 32 contacts the protruding piece 29 becomes longer than when the lever 31 is swung by the first step, and the swing angle of the backrest 3 is increased. Becomes larger.

Further, when the lever 31 is further swung backward by one step, the protruding piece 29 comes into contact with the contact surface 32 located on the front side among the three contact surfaces 32. If it does so, the movement distance of the 2nd rod member 22 required until the contact surface 32 will contact | abut to the protrusion piece 29 will become still longer, and the rocking | fluctuation angle of the backrest part 3 will become still larger than the above-mentioned case.
As described above, in the switching mechanism 28 according to the second embodiment, the abutment surface 32 that abuts on the protruding piece 29 moves toward the rear end side in the second rod member 22 as the swing angle of the lever 31 is increased stepwise. The moving distance of the second rod member 22 necessary for restricting the forward movement is increased stepwise from the position to the position positioned on the front end side, and the swing angle of the backrest 3 is increased in multiple steps. Can be large.

If the swing angle of the backrest 3 can be changed in multiple stages in this way, it can be changed to various states according to the needs of the person sitting on the chair type massage machine 1. It is possible to increase convenience and design variations.
“Third Embodiment”
Next, the chair type massage machine 1 of 3rd Embodiment is demonstrated.

In the chair type massage machine 1 according to the third embodiment, when the switching mechanism 28 is in a position where the footrest part 4 hangs down from the seat part 2, switching between the interlocked state and the non-linked state is permitted, and the footrest part 4 hangs down. Switching is restricted by swinging forward from the above state, which is different from the first and second embodiments in this respect.
Specifically, in the chair type massage machine 1 of the third embodiment, the engagement rib 34 is formed on the outer peripheral surface of the first rod member 13, and the rib engagement portion 36 is formed on the protruding piece 29 of the stopper 28. The engaging rib 34 is engaged with the rib engaging portion 36 so as to be movable in the axial direction, so that the vertical movement of the protruding piece 29 can be restricted.

The engaging rib 34 is formed on one side surface of the first rod member 13 so as to protrude radially outward, and is formed horizontally along the axial direction. The engagement rib 34 is formed from the midway side to the rear end side of the first rod member 13 in the front-rear direction (axial direction).
On the front end side of the engagement rib 34, a tip member 35 that is pointed forward is provided. The tip member 35 is provided with inclined surfaces on the upper side and the lower side so that it can be easily inserted into the rib engaging portion 36 even if the vertical position of the protruding piece 29 is slightly shifted.

  The rib engaging portion 36 is formed in a cutout shape corresponding to the engaging rib 34 on the inner peripheral side of the protruding piece 29, and the engaging rib 34 and a tip member 35 provided on the front end side of the engaging rib 34. And can be engaged with the engaging rib 34 inserted into the rib engaging portion 36 so as to be movable in the axial direction. The rib engaging portion 36 has a lower inner peripheral surface that is inclined so that the opening area increases toward the rear, so that the tip member 35 of the engaging rib 34 can be easily inserted and removed. Yes.

  Therefore, as shown in FIG. 7A, when the first rod member 13 is on the rear end side, in other words, when the footrest portion 4 is in a position depending on the seat portion 2, On the other hand, the engaging rib 34 is separated in the axial direction, the engaging rib 34 is not inserted into the rib engaging portion 36, and the protruding piece 29 is not restricted by the engaging rib 34. Therefore, the protruding piece 29 can be freely moved up and down, and by moving the protruding piece 29 up and down using the lever 31, the switching mechanism 28 can be easily switched between the linked state and the non-linked state.

  However, as shown in FIG. 7B, when the first rod member 13 moves even slightly toward the front end side, in other words, when the footrest portion 4 swings forward from the suspended state, the engagement rib 34 is moved. Inserted into and engaged with the rib engaging portion 36, the vertical movement of the protruding piece 29 is restricted. As a result, the protruding piece 29 is restricted from moving up and down, and the switching mechanism 28 cannot be switched between the interlocking state and the non-interlocking state.

If the switching mechanism 28 can be switched from the non-interlocking state to the interlocking state after the footrest unit 4 is swung with the switching mechanism 28 being in the non-interlocking state, the second rod member 13 is in a second state. Since the rod member 22 is in a position separated in the axial direction, the second rod member 22 moves forward by the weight of the backrest portion 3 until it engages with the first rod member 13, and the backrest portion 3 vigorously moves backward. Since it falls down, it is not preferable. However, if the switching mechanism 28 is restricted when the footrest part 4 swings forward even slightly from the state in which the footrest part 4 hangs down, the switching mechanism 28 cannot be switched from the non-linked state to the linked state. Therefore, it is possible to prevent such a rapid backward swing of the backrest 3.
“Fourth Embodiment”
Next, the chair type massage machine 1 of 4th Embodiment is demonstrated.

  A chair-type massage machine 1 according to the fourth embodiment is a modification of the third embodiment. A protrusion engaging hole 38 that is recessed forward is formed on the inner peripheral surface of the second rod member 22, and the stopper 28. The protruding piece 29 is formed with a retaining protrusion 37 that protrudes rearward. The retaining protrusion 37 is engaged with the protrusion engaging hole 38 so as to be movable in the axial direction. The vertical movement of 29 can be regulated.

The protrusion engaging hole 38 is formed in a concave shape on the inner peripheral surface on the upper side of the second rod member 22 and is formed along the axial direction. The front end of the protrusion engaging hole 38 is open toward the front, and the retaining protrusion 37 can be inserted from the front.
The retaining protrusion 37 is formed in a protruding shape on the middle side in the vertical direction of the protruding piece 29, and extends rearward from the protruding piece 29. The retaining protrusion 37 is formed at a position corresponding to the protrusion engaging hole 38, and is inserted and engaged with the protrusion engaging hole 38 from the front to restrict the vertical movement of the protruding piece 29. It has become.

  Therefore, as shown in FIG. 8A, when the first rod member 13 is on the rear end side, in other words, when the footrest portion 4 is in a position depending on the seat portion 2, On the other hand, the second rod member 22 is separated in the axial direction, and the retaining protrusion 37 of the protruding piece 29 is not inserted into the protrusion engaging hole 38. Therefore, the protruding piece 29 can be freely moved up and down, and by moving the protruding piece 29 up and down, the switching mechanism 28 can be easily switched between the interlocking state and the non-interlocking state.

  However, as shown in FIG. 8 (b), when the second rod member 22 moves even slightly toward the front end side with the first rod member 13, in other words, the footrest portion 4 swings forward from the suspended state. When it moves, the retaining protrusion 37 of the protruding piece 29 engages with the protrusion engaging hole 38 of the second rod member 22, and the vertical movement of the protruding piece 29 is restricted. As a result, the protruding piece 29 is restricted from moving up and down, and the switching mechanism 28 cannot be switched between the interlocking state and the non-interlocking state.

  Therefore, in the switching mechanism 28 of the fourth embodiment, as in the third embodiment, the switching mechanism 28 cannot be switched from the non-interlocking state to the interlocking state, so that the backrest 3 swings vigorously backward. There is no movement. Moreover, in the switching mechanism 28 of 4th Embodiment, switching of the switching mechanism 28 can be controlled with a simpler structure compared with 3rd Embodiment, and manufacturing cost can also be reduced.

Note that the switching mechanism 28 whose switching is restricted when the footrest portion 4 shown in the third embodiment or the fourth embodiment starts to swing is also applied to the chair 1 shown in the first embodiment or the second embodiment. Can be applied.
“Fifth Embodiment”
Next, the chair type massage machine 1 of 5th Embodiment is demonstrated.

  In the chair type massage machine 1 according to the first embodiment to the fourth embodiment, when the swing mechanism 5 is in the interlocking state, the second rod member 22 is merely in contact with the first rod member 13 from the rear. The rearward movement with respect to the first rod member 13 was allowed. In other words, if a force is applied to return the backrest 3 that swings in some time to its original standing posture, the backrest 3 may be uncomfortable for a person sitting back and forth.

  Therefore, the chair type massage machine 1 according to the fifth embodiment is provided with the posture fixing mechanism 40 that fixes the posture of the backrest portion 3 while being swung in the interlocked state. This posture fixing mechanism 40 fixes the posture of the backrest portion 3 while the backrest portion 3 is tilted in the interlocked state, and prevents the posture of the backrest portion 3 from returning to the original standing posture. is there. Note that the posture fixing mechanism 40 also has a function of fixing the posture of the backrest portion 3 while being raised in a non-interlocking state. Therefore, in the following description, the chair type massage machine 1 according to the fifth embodiment will be described by taking as an example one that fixes the posture of the backrest 3 in both the interlocking state and the non-interlocking state.

  As shown in FIGS. 9 and 10, the posture fixing mechanism 40 includes a flip-up member 41 attached to the first rod member 13, and a lock member 42 that moves away from the second rod member 22 by the flip-up member 41. And a stopper hole 43 formed in the housing 21 so that the protruding end 42a of the lock member 42 that has been withdrawn / retracted can be fitted, and the protruding end 42a of the lock member 42 is fitted into the stopper hole 43 and the second By restricting the relative movement between the rod member 22 and the housing 21, the posture of the backrest 3 is fixed.

  The flip-up member 41 is a plate-like member attached to the side surface of the first rod member 13 using a bolt or the like, and is integrated with the first rod member 13 when moving forward and backward of the first rod member 13. It can be moved. The flip-up member 41 is formed to a thickness that allows a lock member 42 to be described later to be placed thereon, and when viewed from the side, the center in the front-rear direction is thicker (higher) than both ends (substantially trapezoidal shape). It has become. That is, the upper surface of the flip-up member 41 is a flat surface, but is divided into three parts, the front side, the center side, and the rear side, and the upper surface on the center side is higher than the front side and the rear side. The upper surface on the center side is horizontal, and the upper surfaces on the front side and the rear side are inclined toward the upper surface on the center side. The lock member 42 placed on the upper surface slides up and down without hindrance. Can be moved to.

  The lock member 42 is a plate-like member having a substantially rectangular cross section cut along the horizontal direction, and is disposed between the first rod member 13 and the second rod member 22 in the front-rear direction. ing. The lock member 42 is removably accommodated in a guide hole 44 formed in the second rod member 22, and the guide hole 44 penetrates the inside and the outside of the second rod member 22 along the vertical direction. It is formed as follows. Therefore, the lock member 42 accommodated in the guide hole 44 is configured to be movable in the vertical direction along the guide hole 44.

The lower corner of the lock member 42 is chamfered at two locations on the front side and the rear side. The chamfered portion is formed at the same inclination angle corresponding to the inclined surface of the flip-up member 41 described above, and when the flip-up member 41 moves forward or backward, the lock member 42 is smoothly moved upward or It is possible to guide down.
A guide pin 45 is formed on the surface (plate surface) of the lock member 42 on the side opposite to the side facing the second rod member 22. The guide pin 45 is fitted into a guide groove 46 formed in the inner peripheral surface of the guide hole 44 along the vertical direction. The upper and lower ends of the guide groove 46 position the upper and lower limits of the range in which the lock member 42 can move. When the guide pin 45 is positioned at the upper end of the guide groove 46, the protruding end 42a of the lock member 42 is When protruding from the upper surface of the second rod member 22 and the guide pin 45 is positioned at the lower end of the guide groove 46, the lower end of the lock member 42 is allowed to descend to a position where it contacts the inclined surface of the flip-up member 41.

  The stopper hole 43 is a hole formed on the upper side of the housing 21 so that the protruding end 42a of the locking member 42 moved upward by the flip-up member 41 can be inserted, and the protruding end 42a of the locking member 42 is inserted in the interlocked state. The first stopper hole 47 is provided with a second stopper hole 48 into which the protruding end 42a of the lock member 42 is inserted when not engaged. The first stopper hole 47 and the second stopper hole 48 are spaced apart in the front-rear direction (the distance between the step 27 of the first rod member 22 and the rear end surface of the housing 21), and have the same lateral position. The first stopper hole 47 formed on the front side of the housing 21 and the second stopper hole 48 formed on the rear side can be engaged with the lock member 42. Whether the stopper hole 43 into which the lock member 42 is inserted is the first stopper hole 47 or the second stopper hole 48 is selected depending on whether the stopper 28 described above is in an interlocked state or a non-interlocked state. Can do.

Next, the operation of the posture fixing mechanism 40 will be described with reference to FIGS. 11 and 12.
As shown in FIG. 11A, in the interlocked state in which the stopper 28 is moved upward, when the drive motor 17 is rotated in the forward rotation direction and the first rod member 13 is moved forward, FIG. Since the 2nd rod member 22 is not being fixed to the housing 21 as shown in (1), the 1st rod member 13 and the 2nd rod member 22 move ahead integrally. When the step 27 abuts on the rear end surface of the housing 21 as shown in FIG. 11C, only the second rod member 22 is restricted from moving forward and only the first rod member 13 moves forward. It becomes like this.

  Then, the inclined surface formed on the front side of the flip-up member 41 pushes up the chamfered portion on the rear side of the lock member 42, the lock member 42 slides upward along the inclined surface, and the guide pin 45 is inserted. Guided by the groove 46, the lock member 42 moves upward. Then, the protruding end 42 a of the lock member 42 protrudes from the upper surface of the second rod member 22 and fits into the first stopper hole 47 formed on the front side of the housing 21, so that the second rod member 22 moves forward with respect to the housing 21. It will be in the fixed state which does not move back.

As shown in FIG. 11 (d), while the lower surface of the lock member 42 moves horizontally along the upper surface of the flip-up member 41, the protruding state of the lock member 42 is maintained and the second rod member 22 moves back and forth. The posture of the backrest portion 3 that swings in accordance with is also maintained in a fixed state.
When returning the postures of the backrest part 3 and the footrest part 4 to the original positions, when the drive motor 17 is rotated in the reverse rotation direction, the first rod member 13 moves backward, and an operation opposite to the above-described operation occurs, and before swinging. It can be returned to the state.

On the other hand, when the stopper is moved downward as shown in FIG. 12A, the second rod member is moved forward by rotating the drive motor 17 in the forward direction and moving the first rod member 13 forward. Since 22 is fixed to the housing 21 by the stopper 28, only the first rod member 13 moves forward while leaving the second rod member 22.
Then, as shown in FIGS. 12 (b) and 12 (c), the flip-up member 41 pushes up the lock member 42 in the same manner as in the interlocked state, so that the protruding end 42 a of the lock member 42 is formed on the rear side of the housing 21. The second rod member 22 is fitted into the second stopper hole 48 thus fixed, so that the second rod member 22 does not move forward or backward relative to the housing 21, and the posture of the backrest 3 is fixed.

  Further, when the flip-up member 41 moves forward, the lock member 42 moves downward while being guided by an inclined surface formed on the rear side of the flip-up member 41. When the lock member 42 is lowered until the guide pin 45 is positioned at the lower end of the guide groove 46, the guide pin 45 is positioned at the lower end of the guide groove 46, and the lowering of the lock member 42 is stopped. There is no descent.

Even when the posture of the backrest part 3 and the footrest part 4 is returned to the original position, an inclined surface is also formed on the rear side of the flip-up member 41, so even the lock member 42 in the lowered position can be easily moved upward. Can move.
The present invention is not limited to the above-described embodiments, and the shape, structure, material, combination, and the like of each member can be appropriately changed without changing the essence of the invention.

In the said embodiment, the chair 1 of this invention was demonstrated taking the example of the chair type massage machine. However, the chair 1 of the present invention is a chair that can be reclined when washing hair in a beauty salon or barbershop, a chair or sofa that can be reclined when relaxing in a living room, or a seat on which passengers sit on a vehicle such as an airplane or train Can be used.
In the above embodiment, the stopper 28 is illustrated on the upper surface side of the second rod member 22. However, the stopper 28 may be provided on the side surface side or the lower surface side of the second rod member 22.

  In the embodiment described above, the switching mechanism 28 that protrudes toward the second rod member 22 and switches from the interlocking state to the non-interlocking state when the stopper 28 abuts on the opening edge of the second rod member 22 is taken as an example. However, as the switching mechanism 28 provided in the chair 1 of the present invention, for example, a lock pin that is electrically retracted as a stopper 28 is provided, and a hole that engages with the lock pin is provided on the outer peripheral surface of the second rod member 22. It is also possible to employ a switching mechanism 28 that is formed at one place or a plurality of places and the lock pin is engaged with the hole of the second rod member 22 to switch from the interlocking state to the non-interlocking state.

  In the above embodiment, the first rod member 13 is inserted into the second rod member 22, and the relative movement of the first rod member 13 with respect to the second rod member 22 is restricted by contacting the inner bottom portion 26 of the second rod member 22. The swing mechanism 5 to be performed is illustrated. However, for example, a protrusion that protrudes toward the first rod member 13 is provided on the second rod member 22, and the first rod member 13 is brought into contact with the protrusion so that the first rod member 13 is relative to the second rod member 22. You may employ | adopt the rocking | fluctuation mechanism 5 in which a movement is controlled.

In the above embodiment, the switching mechanism 28 in which the protruding piece 29 of the stopper 28 contacts the contact surface 32 provided on the front end side of the second rod member 22 is exemplified. However, the abutment surface 32 can be provided on the rear end side of the second rod member 22 so that the backrest portion 3 can be swung almost horizontally.
In the second embodiment, a plurality of contact surfaces 32 that can come into contact with the projecting pieces 29 of the stopper 28 are provided on the outer peripheral surface of the second rod member 22 at different positions in the front-rear direction. The chair 1 that can change the swing angle of the backrest 3 in multiple stages by abutting on any of the contact surfaces 32 is illustrated. However, the swing angle of the backrest 3 can be changed in multiple stages by providing a plurality of stoppers 28 with different positions in the front-rear direction and the front end edge of the second rod member 22 abutting one of the plurality of stoppers 28. You may do it.

  In addition, as shown in FIG. 13, in order to prevent a foreign material etc. from being caught between the footrest part 4 and the seat part 2 when the footrest part 4 swings, the first rod is disposed on the distal end side of the first rod member 13. A connecting member 50 that can move back and forth with respect to the member 13 and connects the first rod member 13 and the footrest portion 4 is provided, and the connecting member 50 is an elastic member 51 disposed in the first rod member 13. Accordingly, the first rod member 21 may be biased toward the proximal end side. For example, the connecting member 50 is formed in a square bar shape, and the rod-like connecting member 50 is accommodated in the first rod member 21 so as to freely enter and exit in the front-rear direction. If a spring 51 (elastic member 51) is provided between the rear end (base end) of the connecting member 50 and the first rod member 21 on the connecting member 50, the connecting member 50 is urged rearward. It will be. In this way, even if an object is caught between the footrest part 4 and the seat part, the connecting member 50 moves so as to extend from the first rod member 21 against the spring 51. The force of the motor 17 does not reach directly, and the pinched object can be prevented from being damaged. Moreover, if the footrest part 4 is pulled away in the anti-oscillation direction by hand against the urging force of the elastic member 51, it is easy to remove the pinched object.

  Further, for example, when the protruding piece 29 of the stopper is caught in the midway position in the vertical direction, there is a possibility that switching between the interlocking state and the non-interlocking state cannot be performed reliably. In such a case, as shown in FIG. 13, in the movement path along the vertical direction of the protrusion piece 29, the protrusion piece 29 is biased upward when the protrusion piece 29 is positioned above the movement path. A switching urging mechanism 52 that switches between the urging state and the urging state in which the protruding piece 29 is urged downward when the protruding piece 29 moves to the lower side of the movement path may be provided.

  Specifically, as the switching urging mechanism 52, the base end side of the urging means 53 such as a spring is placed on a line L connecting the protruding piece 29 and the swing center P of the protruding piece 29 as shown in FIG. It is possible to employ a fixing means that connects the distal end side of the urging means 53 to the protruding piece 29 and applies an urging force to the protruding piece 29. In this way, when the position of the projecting piece 29 is above the neutral position on the line L described above, the member supporting the projecting piece 29 is attached in a direction to rotate upward about its swing center P. A force acts, and the protruding piece 29 is urged upward along the movement path. Further, when the protruding piece 29 is below the neutral position, a biasing force acts in the direction opposite to the above-described operation, and the protruding piece 29 is biased downward. As a result, the protruding piece 29 does not stay in the middle position of the movement path, and the protruding piece 29 is always located at either the upper end or the lower end of the movement path, so that switching between the interlocking state and the non-interlocking state is ensured. Will be able to do.

1 Chair (chair-type massage machine)
DESCRIPTION OF SYMBOLS 2 Seat part 3 Backrest part 4 Footrest part 5 Oscillation mechanism 6 Wheel 7 1st slide member 8 2nd slide member 9 1st oscillation mechanism 10 Drive part 11 2nd oscillation mechanism 12 Contact part 13 1st rod member 14 Pivot support pin 15 Guide wheel 16 Screw shaft 17 Drive motor 18 Screw member 19 Male screw portion 20 Female screw portion 21 Housing 22 Second rod member 23 Engagement pin 24 Engagement hole 25 Groove portion 26 Inner bottom portion 27 Step 28 Switching mechanism (stopper)
DESCRIPTION OF SYMBOLS 29 Protrusion piece 30 Oscillating shaft 31 Lever 32 Contact surface 33 Step part 34 Engagement rib 35 Tip member 36 Rib engagement part 37 Detent protrusion 38 Protrusion engagement hole 40 Posture fixing mechanism 41 Bounce member 42 Lock member 42a lock Protruding end of member 43 Stopper hole 44 Guide hole 45 Guide pin 46 Guide groove 47 First stopper hole 48 Second stopper hole 50 Connecting member 51 Elastic member (tension spring)
52 Switching urging mechanism 53 Biasing means C Cushioning material P Center of swing of protruding piece

Claims (12)

The seat portion, the backrest portion swingably provided on the back surface of the seat portion, the footrest portion swingably provided on the front surface of the seat portion, and the footrest portion and the backrest portion are swung with respect to the seat portion. A swinging mechanism for moving the chair,
The swing mechanism is a switching mechanism that switches between an interlocking state in which the backrest portion swings in conjunction with the swinging of the footrest portion and a non-interlocking state in which the backrest portion does not swing and only the footrest portion swings. A chair characterized by comprising:   The swing mechanism swings the backrest portion in accordance with the first swing mechanism that swings the footrest portion, a drive unit that drives the first swing mechanism, and the first swing mechanism. 2. The chair according to claim 1, further comprising: a second swing mechanism; and a switching mechanism that temporarily restricts the driven operation of the second swing mechanism with respect to the first swing mechanism. The first swing mechanism includes a first rod member that is connected to the footrest portion and arranged to be movable in the front-rear direction.
The second rocking mechanism is connected to the backrest part, and is allowed to move backward with respect to the first rod member and a second rod member that is pressed forward by a backward rocking by the weight of the backrest part. An abutting portion that abuts against the first rod member from the rear in a state and guides the second rod member forward while following the first rod member while restricting forward movement of the second rod member. ,
3. The chair according to claim 2, wherein the switching mechanism includes a stopper that switches the swing mechanism from an interlocking state to a non-interlocking state by restricting forward movement of the second rod member.   The switching mechanism is allowed to switch between the interlocking state and the non-interlocking state when the footrest part is in a position depending on the seat part, and the switching is performed when the footrest part swings forward from the state where the footrest part is hanging down. The chair according to claim 1, wherein the chair is configured to be restricted. The second rod member is formed in a hollow bottomed cylindrical shape that can be inserted and removed from the front along the axial center of the first rod member, and an inner bottom portion thereof is a contact portion of the second swing mechanism. And
The chair according to claim 3 or 4, wherein the stopper is configured to abut against an opening edge of the second rod member. The second rod member includes a plurality of abutting surfaces that can abut against the stopper while changing the position in the front-rear direction.
The chair according to any one of claims 3 to 5, wherein a swing angle of the backrest portion is switched in multiple stages by any one of a plurality of contact surfaces coming into contact with the stopper.   The chair according to any one of claims 1 to 6, wherein a massage mechanism is built in the backrest part and the footrest part.   The chair according to any one of claims 1 to 7, wherein the swing mechanism includes a posture fixing mechanism that fixes the posture of the backrest portion in a state in which the backrest portion is in the interlocked state. .   The chair according to claim 8, wherein the posture fixing mechanism is configured to fix the posture of the backrest portion in a state where the backrest portion is raised in the non-interlocking state. The posture fixing mechanism is
The backrest engages with a lock member protruding toward the outside of the second rod member according to the front-rear position of the first rod member with respect to the second rod member, and a lock member protruding outward of the second rod member. A first stopper hole for fixing the posture of the portion in a tilted state, and formed at the rear of the first stopper hole in the front-rear direction, and engages with the protruding end in the non-interlocking state so that the posture of the backrest portion is The chair according to claim 8 or 9, further comprising a second stopper hole for fixing the raised state. The front end side of the first rod member is provided with a connecting member that can move back and forth with respect to the first rod member and connects the first rod member and the footrest portion,
The said connection member is urged | biased toward the base end side of the 1st rod member by the elastic member arrange | positioned in the 1st rod member, The Claim 1 characterized by the above-mentioned. Chair. The stopper includes a protruding piece that can move through a moving path that faces in the up-down direction, and the protruding piece moves to the lower end side of the moving path and contacts the second rod member. It is configured to restrict the forward movement of the rod member,
A biased state in which the protruding piece is urged upward when the protruding piece is positioned on the upper side of the moving path, and a downward direction when the protruding piece moves to the lower side of the moving path. The chair according to any one of claims 3 to 11, further comprising a switching biasing mechanism that switches between biasing states to be biased.