JP2005104259A - Seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a new seat which can reduce the shaking of the head section of a passenger rearward for an impact from the rear side. <P>SOLUTION: When an impact is received from the rear side, the back of the passenger sinks in a backrest. At this time, a press plate 94 is pushed rearward, and respective right and left wires 90a and 90b are pulled downward. At the same time, right and left arms 74a and 74b are pulled, and a shaft 69 rotates, and right and left parallel links 63a and 63b of a head-leg connecting mechanism 60 operate in a manner to pivotally move an inner case 80 forward regarding a leg section frame 53. Thus, a headrest 40 moves forward and supports the head section of the passenger, and the shaking of the head section of the passenger rearward is reduced. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a vehicle seat, and more particularly, to a seat that can reduce the backward movement of an occupant's head in response to an impact from the rear.

  When a vehicle such as an automobile is impacted forward from behind, that is, when a rear-end collision occurs from behind, the seat instantaneously moves forward with the vehicle, and the back of the occupant sitting on the seat rests on the backrest. Sink. It is known that the head of the occupant is swung further backward in the vicinity of the base of the neck and shoulder after the back sinks into the backrest, which causes the occupant to whipping. Yes.

In general, a headrest is attached to a seat (see, for example, Patent Document 1). The occupant usually sits with the backrest tilted slightly backwards, and in order to improve collision safety (especially safety against a frontal collision), a seat belt is worn and the torso below the neck is almost fitted to the backrest. Although it is fixed, if the occupant's back head is placed on the headrest, the occupant looks like looking at the ceiling. Sitting in a posture that can. For this reason, when an impact from the rear is unexpectedly received, it is inevitable that the head of the occupant suddenly swings backward in the vicinity of the base of the neck and shoulder.
JP2001-137067

  For this reason, in the automobile industry, it is a technical problem to improve the collision safety when subjected to an impact from the rear.

  Accordingly, an object of the present invention is to provide a novel seat that can reduce the backward swing of the occupant's head against an impact from the rear.

  The present invention utilizes the fact that the back of the occupant sinks into the backrest when receiving an impact from the rear, thereby moving the headrest forward, thereby reducing the backward movement of the occupant's head. Is.

  The seat of the present invention that achieves the above object includes a seat having a seat frame to which a cushion for seating is attached, a backrest having a back frame attached to a rear portion of the seat frame and having a cushion for backrest, and an upper portion of the backrest. And a means for moving the headrest in the forward direction.

  The headrest has a stay frame assembly that is a skeleton of the headrest.

  The stay frame assembly is inserted in the upper part of the backrest, and the headrest is attached to the upper part of the backrest.The right and left legs are long in the downward direction, and the right and left legs are fixed in the left-right direction with a gap. A front frame with an inverted U-shaped front frame with a long leg beam, a head frame with a long head beam in the left-right direction located above the leg frame, and the head frame in the front-rear direction with respect to the leg frame And a head / leg connecting mechanism for connecting between the leg frame and the head frame.

  The stay frame assembly is fixed to the head frame, and has a gap between the head frame, the upper part of the leg frame and the substantially box-shaped main body that houses the head / leg coupling mechanism, and the bottom surface of the main body. The inner case further includes an inner case composed of a plate portion which is coupled to the bottom surface of the main body portion and has slots formed on the left and right, respectively, which are long slots in the front-rear direction communicating with the inside of the main body portion. Each of the left legs passes through each of the slots and extends to the outside of the inner case.

  The headrest is further formed by foaming a foamed undiluted solution inside the outer skin so as to enclose the hollow interior and the outer skin of the headrest having an opening communicating with the hollow interior and the main body portion of the inner case. The peripheral edge portion of the opening of the epidermis inserted into the gap between the bottom surface of the main body portion of the inner case and the plate portion is held in this gap by the pad. .

  The means for moving the headrest in the forward direction includes a transmission means for transmitting the force to the head / leg connecting mechanism when a backward force is applied to the backrest, and the force is applied to the head / leg connecting mechanism. When it is transmitted to the leg frame, the leg frame is constituted by an operating means for operating the head / leg connecting mechanism so as to move the head frame forward.

  The head frame has a head side right bracket and a head side left bracket fixed so as to face the right side and the left side of the head beam, respectively, and the leg frame is provided on the right side and the left side of the leg beam. Each has a leg-side right bracket and a leg-side left bracket fixed to face each other. The head / leg connecting mechanism is formed between the right side parallel link formed between the head side right bracket and the leg side right bracket, and between the head side left bracket and the leg side left bracket. Left parallel link.

  The right parallel link has one end pivotably attached to the front side of the head side right bracket and the other end attached to the front side of the leg side right bracket so as to be pivotable with respect to the leg front side pivot axis. One end is pivotally attached to the rear side of the head side right bracket so that it is substantially parallel to the member and the front right link member, and the other end is rear side of the leg side right bracket and the rear side of the leg It consists of a rear right link member that is pivotally mounted with respect to the pivot axis.

  The left parallel link has one end pivotably attached to the head side left bracket and the other end attached to the leg side left bracket so as to be pivotable with respect to the leg front side pivot axis. One end is pivotally attached to the rear side of the head-side left bracket so that it is substantially parallel to the member and the front left link member, and the other end is attached to the rear side of the leg-side left bracket. The rear left link member is pivotally attached to the rear pivot shaft.

  The actuating means has a shaft that is fixed to the rear right link member and the rear left link member and also serves as the leg rear pivot shaft. Further, instead of the shaft that also serves as the leg rear pivot shaft, a shaft that is fixed to the front right link member and the front left link member of the head / leg coupling mechanism and also serves as the leg front pivot shaft may be used. Good.

  The transmission means is composed of a rotation means for rotating the shaft so that the head frame moves forward with respect to the leg frame when a backward force is applied to the backrest.

  The rotating means includes a wire, an attaching means for attaching one end of the wire to the shaft, and a tension for pulling the wire so that the shaft is rotated when a backward force is applied to the backrest. Consists of means.

  The attachment means is composed of an arm fixed to the outer peripheral surface of the shaft and extending outward from the rotation axis of the shaft, and one end of the wire is attached to the arm.

  The pulling means has an L-shaped link member attached to the back frame so as to be pivotable in the front-rear direction.

  The L-shaped link member has a portion that is long in the upward direction, a portion that is long in the rear direction, and a bent portion that connects these portions, and the L-shaped link member is front and rear with respect to the bent portion of the L-shaped link member. A press plate having a surface facing forward is attached to an upper portion of the L-shaped link member that is pivotable in the direction and is long in the upward direction.

  And the other end of the wire is connected to the rear long part of the L-shaped link member, and when a backward force is applied to the backrest, the press plate is pushed backward and the wire is pulled, The head / leg coupling mechanism is operated such that the shaft rotates and the head frame moves forward with respect to the leg frame, whereby the headrest moves forward.

  The back frame has a right frame and a left frame that are arranged with a space between them on the left and right sides, an upper beam that is long in the horizontal direction connecting the upper portions of the right and left frames, and a lower portion of the right and left frames. The L-shaped link member is attached to the lower beam of the back frame so as to be pivotable in the front-rear direction.

  In addition, at least one of the right leg and the left leg is hollow, and one end of the wire is attached to the arm through the hollow leg.

  When the head frame and the left and right side brackets on the head side are moved in the front-rear direction with respect to the leg frame, the head and leg coupling mechanism determines the movement direction and distance of the head side right bracket and the head side left bracket. Link member connecting means for connecting the right and left link members on at least one of the right and left link members on the front side and the right and left link members on the rear side so that the moving direction and the distance coincide with each other. Can be further configured. Preferably, the link member connecting means includes a front right and left link member, and a connecting shaft that is long in the left-right direction for connecting the right and left link members on at least one side of the rear right and left link members. Is done.

  Further, the seat of the present invention may be further configured by a lock unit that limits a distance of the head frame to move forward with respect to the leg frame and fixes the position of the head frame at the position moved by this distance. Preferably, the locking means includes a hook attached to at least one of the leg side right bracket and the leg side left bracket. When the head frame moves forward with respect to the leg frame, the link is provided. The connecting shaft of the member connecting means is hooked on the hook, thereby limiting the distance of the head frame to move forward with respect to the leg frame, and the position of the head frame is fixed at the position moved by this distance. The head frame is prevented from moving backward.

  Preferably, the shaft is rotated using two wires, the head / leg coupling mechanism is operated so that the head frame moves forward with respect to the leg frame, and the headrest is moved forward.

  That is, the right and left arms extending outward from the rotation axis of the shaft are fixed to the outer peripheral surface of the shaft with a space in the left and right direction, and one end of the right and left wires is attached to the right and left arms, respectively. . Then, the other ends of the right and left wires are connected to the back frame so as to be pivotable in the front-rear direction, and are connected to the rear long portions of the right and left L-shaped link members having the same shape as the L-shaped link members. Further, a single press plate whose surface is directed forward is attached to the upper portion of each of the right and left L-shaped link members.

  These right and left L-shaped link members are attached to the lower beam of the back frame so as to be pivotable in the front-rear direction with a space in the left-right direction. The right leg and the left leg are hollow, and one end of each of the right and left wires is attached to the right and left arms fixed to the shaft through the hollow right leg and left leg.

  When impacted from behind, the back of the occupant sinks into the backrest. At this time, the press plate is pushed backward, the wire is pulled and the shaft rotates, and the head / leg connecting mechanism operates to move the head frame forward with respect to the leg frame, thereby the headrest Can move forward, support the head of the occupant, and reduce rearward movement of the occupant's head.

  As shown in FIGS. 5A and 5B, a seat 10 according to the present invention includes a seat 20 having a seat frame 21 to which a seating cushion is attached, a back frame attached to a rear portion of the seat frame 21 and a backrest cushion. The backrest 30 includes a headrest 40 that is attached to the top of the backrest 30 and is movable in the forward direction, and a means for moving the headrest 40 in the forward direction (direction indicated by arrow F in FIG. 2). .

  The back frame 31 includes a right frame 34 and a left frame 35 that are arranged with a space between them on the left and right sides, an upper beam 33 that is long in the left-right direction connecting the upper portions of the right and left frames 34, 35, and the right and left frames 34. , 35 are connected to the rear portion of the seat frame 21 via a known reclining mechanism 22.

  As shown in FIGS. 1 to 3 and FIG. 5A, the headrest 40 includes a stay frame assembly 50 that is a skeleton of the headrest 40.

  The stay frame assembly 50 includes a right leg 73a and a left leg 73b that are long in the downward direction, and a front leg that is long in the left-right direction, with the right leg 73a and the left leg 73b fixed at intervals. The head frame 31 can be moved in the front-rear direction with respect to the U-shaped leg frame 53, the head frame 51 having a head beam 52 that is long in the left-right direction above the leg frame 53, and the leg frame 53. The head-and-leg connecting mechanism 60 for connecting the leg frame 53 and the head frame 51 is provided.

  Here, the headrest 40 is inserted into hollow cylindrical mounting portions 36a and 36b in which the right leg 73a and the left leg 73b of the stay frame assembly 50 are fixed to the upper beam 33 of the back frame 31 with a space therebetween. It is attached to the upper part of the backrest 30.

  As shown in FIGS. 2 and 3, the stay frame assembly 50 further includes a head frame 51, a substantially box-shaped main body 81 that houses the upper portion of the leg frame 53 and the head / leg connecting mechanism 60, and the main body. An inner case composed of a plate portion 82 that is coupled to the bottom surface of the main body portion 81 so as to leave a gap between the bottom surface of the portion 81 and has long slots in the front-rear direction communicating with the inside of the main body portion 81 on the left and right sides. As shown in FIG. 5, each of the right leg 73a and the left leg 73b of the leg frame 53 extends through the slot to the outside of the inner case 80. Here, only the right slot indicated by reference numeral 85a is shown in FIG. 2, but a left slot (not shown) having the same shape as the slot 85a is also formed in the plate portion 82.

  As shown in FIGS. 2 and 3, the headrest 40 further includes a hollow interior and a skin 42 having a contour shape of the headrest 40 and a main body of the inner case 80 having a slit-like opening communicating with the hollow interior. A foam 41 is formed inside the skin 42 so as to wrap the part 81, and has a pad 41 formed so as to be integrated with the skin 42, between the bottom surface of the main body 81 of the inner case 80 and the plate part 82. The peripheral portion of the slit-like opening of the skin 42 inserted into the gap is held in the gap by the pad 41.

  The means for moving the headrest 40 in the forward direction is such that when a backward force (a force in the direction indicated by the arrow P in FIG. 4) is applied to the backrest 30, this force is applied to the head / leg coupling mechanism 60. The transmission means 96 for transmitting to the head and the head / leg connection mechanism 60 are operated so that the head frame 51 is moved forward with respect to the leg frame 53 when this force is transmitted to the head / leg connection mechanism 60. It is composed of operating means.

  The head frame 51 has a head side right bracket 61a and a head side left bracket 61b fixed so as to face the right side and the left side of the head beam 52, respectively. As shown in FIG. The bracket 61a and the head-side left bracket 61b are provided with screw holes 84a and 84b, respectively. As shown in FIGS. 2 and 3, the head-side right bracket 61a and the head-side bracket are used by using screws 83. The side left bracket 61 b is fixed to the main body 81, whereby the inner case 80 is fixed to the head frame 51. Further, the inner case 80 is fixed to the head frame 51 by forming the inside of the main body 81 of the inner case 80 in a shape such that the head frame 51 fits inside the main body 81. The above-described screw holes 84a and 84b are provided in the right bracket 61a and the head-side left bracket 61b so that the above-described screw 83 can be used.

  The leg frame 53 includes a leg-side right bracket 62a and a leg-side left bracket 62b fixed so as to face the right and left sides of the leg beam 54, respectively.

  The head / leg connecting mechanism 60 includes a right parallel link 63a formed between the head-side right bracket 61a and the leg-side right bracket 62a, a head-side left bracket 61b, and a leg-side left bracket 62b. It consists of a left parallel link 63b formed between them.

  2 and 3, the right parallel link 63a has one end pivotably attached to the front side of the head side right bracket 61a and the other end on the front side of the leg side right bracket 62a. One end is pivotally attached to the rear side of the head-side right bracket 61a so as to be substantially parallel to the front right link member 64a and the front right link member 64a pivotally attached to the front side pivot shaft 67. The other end is constituted by a rear right link member 65a attached to the rear side of the leg side right bracket 62a so as to be pivotable with respect to the leg rear side pivot shaft 68.

  The left parallel link 63b is mirror-symmetrical with the right parallel link 63a, and as shown in FIG. 1, one end is pivotally attached to the head side left bracket 61b and the other end is the leg side left bracket 62b. The front left link member 64b that is pivotably attached to the leg front side pivot shaft 67, and one end on the rear side of the head side left bracket 61b so as to be substantially parallel to the front left link member 64b. The rear left link member 65b is pivotally attached, and the other end is attached to the rear side of the leg side left bracket 62b so as to be pivotable with respect to the leg rear side pivot shaft 68.

  The actuating means includes a shaft 69 that is fixed to the rear right link member 65 a and the rear left link member 65 b and also serves as the leg rear pivot shaft 68. Further, instead of the shaft 69 that also serves as the leg rear pivot shaft 68, the front leg link mechanism 60 is fixed to the front right link member 64a and the front left link member 64b, and the leg front pivot shaft 67 is also used. A shaft (not shown) may be used.

  The transmission means 96 has a shaft so that when a rearward force is applied to the backrest 30, the head frame 51 moves forward (direction indicated by arrow F in FIG. 2) with respect to the leg frame 53. Rotating means for rotating 69 is configured.

  The rotating means includes right and left wires 90a and 90b, attachment means for attaching one end of each of the right and left wires 90a and 90b to the shaft 69, and when a backward force is applied to the backrest 30. , Composed of tension means for pulling the right and left wires 90a, 90b to rotate the shaft 69.

  As shown in FIGS. 1 and 2, the attachment means for attaching one end of each of the right and left wires 90a, 90b to the shaft 69 is fixed to the outer peripheral surface of the shaft 69 with a space in the left-right direction. The right and left arms 74a and 74b extend outward from the rotation shaft of the right and left ends, and one ends of the right and left wires 90a and 90b are attached to the right and left arms 74a and 74b, respectively.

  As shown in FIG. 1, the pulling means for pulling the right and left wires 90a and 90b has right and left L-shaped link members 91a and 91b attached to the back frame 31 so as to be pivotable in the front-rear direction.

  These right and left L-shaped link members 91a and 91b each have a portion that is long in the upward direction, a portion that is long in the rear direction, and a bent portion that connects these portions, as shown in FIGS. .

  The right and left L-shaped link members 91a and 91b are respectively attached to the right and left pivot portions 93a and 92b of the bifurcated bracket 92 fixed to the approximate center of the lower beam 32 of the back frame 31. , 93b, the bent portions of the right and left L-shaped link members 91a, 91b are pivotally attached in the front-rear direction.

  One press plate 94 whose front surface is directed forward is attached to the upper part of each of the right and left L-shaped link members 91a and 91b, and the other ends of the right and left wires 90a and 90b are respectively The right and left L-shaped link members 91a and 91b are connected to the long portions in the rearward direction. In the illustrated example, a wide backing plate (indicated by a broken line 95 in FIGS. 1, 4, and 5 </ b> A) is fixed to the surface of the press plate 94 in the left-right direction of the lower portion of the backrest 40.

  The right leg 73a and the left leg 73b of the stay frame assembly 50 are hollow, and one end of each of the right and left wires 90a, 90b is passed through the hollow right leg and left legs 73a, 73b. Are attached to right and left arms 74a and 74b fixed to the shaft 69.

  As shown in FIGS. 1 and 2, the head / leg connecting mechanism 60 further moves the head when the head frame 51 and the head side right and left brackets 61 a and 61 b are moved in the front-rear direction with respect to the leg frame 53. From the connecting shaft 70 for connecting the rear right and left link members 65a, 65b so that the moving direction and distance of the part side right bracket 61a and the moving direction and distance of the head side left bracket 61b coincide. Composed. Here, instead of connecting the rear right and left link members 65a and 65b, the front right and left link members 64a and 64b may be connected by a connecting shaft (not shown).

  The seat 10 of the present invention further includes a locking means that limits the distance of the head frame 51 in the forward direction with respect to the leg frame 53 and fixes the position of the head frame 51 when the head frame 51 has moved by this distance. The As shown in the figure, the locking means is composed of hooks 72a and 72b attached to the leg-side right bracket 62a and the leg-side left bracket 62b via spiral springs 72c (FIG. 1), respectively, with respect to the leg frame. When the head frame moves in the forward direction, the connecting shaft 70 is securely hooked on the hooks 72a and 72b, thereby limiting the distance of the head frame 51 to move in the forward direction with respect to the leg frame 53. Then, the position of the head frame 51 is fixed at the position moved by this distance, and the backward movement of the head frame 51 is prevented. Such hooks 72a and 72b may be attached to only one of the leg side right bracket and the leg side left bracket.

  Further, right and left concave portions 71a and 71b that suppress the backward movement of the connecting shaft 70 are provided, and the connecting shaft 70 is normally received by the right and left concave portions 71a and 71b.

  When a rearward force is applied to the backrest 40, as shown in FIG. 4, the backing plate 95 and the press plate 94 are pushed backward (in the direction indicated by the arrow P), and the right and left L-shaped links. The members 91a and 91b pivot in the direction of the arrow R with respect to the pivot pins 93a and 93b, the right and left wires 90a and 90b are pulled in the direction of the arrow T, and the shaft 69 shown in FIG. The head / leg coupling mechanism 60 operates so that the head frame 51 moves in the forward direction (the direction indicated by the arrow F) with respect to the frame 53, whereby the headrest 40 moves in the forward direction (the direction indicated by the arrow F). The forward movement of the headrest 40 stops when the connecting shaft 70 is hooked on the hooks 62a and 62b, and the headrest 40 is fixed at this position and does not move backward again.

FIG. 1 is a perspective view of a back frame. FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 1 and shows the head frame not moving in the forward direction. FIG. 3 is a cross-sectional view taken along line 2-2 of FIG. 1 and shows the head frame moved forward and locked. 4 is a cross-sectional view taken along line 3-3 of FIG. FIG. 5A is a perspective view of a seat frame and a back frame, and FIG. 5B is a perspective view of a seat.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Seat 20 ... Seat 21 ... Seat frame 22 ... Reclining mechanism 30 ... Backrest 31 ... Back frame 32 ... Lower beam 33 ... Upper beam 34 ... Right frame 35 ... left frame 36a, 36b ... mounting portion 40 ... headrest 41 ... pad 42 ... skin 50 ... stay frame assembly 51 ... head frame 52 ... Head beam 53 ... Leg frame 54 ... Leg beam 60 ... Head / leg connecting mechanism 61a ... Head side right bracket 61b ... Head side left bracket 62a ... Leg side Right bracket 62b ... leg side left bracket 63a ... right parallel link 63b ... left parallel link 64a ... front right link member 64b ... front left link member 65a ... Side right link member 65b ... Rear left link member 67 ... Leg front pivot shaft 68 ... Leg rear pivot shaft 69 ... Shaft 70 ... Connecting shaft 71a ... Right side Recess 71b ... Left recess 72a ... Right hook 72b ... Left hook 72c ... Spiral spring 73a ... Right leg 73b ... Left leg 74a ... Right arm 74b ... Left arm 80 ... Inner case 81 ... Body part 82 ... Plate part 83 ... Screw 84a, 84b ... Screw hole 85a ... Right slot 90a ... Right wire 90b ... Left wire 91a .... Right L-shaped link 91b ... Left L-shaped link 92 ... Bifurcated bracket 92a ... Right part 92b ... Left part 93a ... Right pivot pin 93b ... Left pivot Pin 94 ・Press plate 95 ... backing plate 96 ... transmission means

Claims (15)

A seat having a seat frame fitted with a cushion for sitting;
A backrest having a back frame attached to a rear portion of the seat frame and attached with a cushion for a backrest;
A headrest movable in the forward direction attached to an upper portion of the backrest, and means for moving the headrest in the forward direction;
A seat consisting of
The headrest is
A stay frame assembly as a skeleton of the headrest,
Have
The stay frame assembly is
A right leg and a left leg that are long downward and are inserted into the upper part of the backrest and the headrest is attached to the upper part of the backrest, and a leg part that is long in the left and right direction and fixed to the right leg and the left leg with a gap. A front generally inverted U-shaped leg frame having a beam;
A head frame having a long head beam in the left-right direction, located above the leg frame;
A head / leg connecting mechanism for connecting the leg frame and the head frame so that the head frame can be moved in the front-rear direction with respect to the leg frame; Coupled to the bottom surface of the main body portion so as to leave a gap between the body frame, the upper portion of the leg frame and the substantially box-shaped main body portion that accommodates the head / leg coupling mechanism, and the bottom surface of the main body portion, An inner case comprising a plate portion formed on the left and right with long slots in the front-rear direction communicating with the inside of the main body, each of the right leg and the left leg of the leg frame passing through each of the slots. An inner case that extends to the outside of the inner case,
Consisting of
The headrest is further
The skin is foamed with a foaming undiluted solution inside the skin so as to enclose the main body of the inner case and the outer skin of the contour of the headrest having a hollow interior and an opening communicating with the hollow interior A pad formed so as to be integrated with the outer peripheral portion of the opening of the epidermis inserted into the gap between the bottom surface of the main body portion of the inner case and the plate portion. The pad, which is held in
Consisting of
The means for moving the headrest forward;
When a rearward force is applied to the backrest, a transmission means for transmitting the force to the head / leg coupling mechanism, and when the force is transmitted to the head / leg coupling mechanism, the leg frame The actuating means for actuating the head / leg coupling mechanism to move the head frame forward;
Consisting of,
But the seat. The head frame has a head side right bracket and a head side left bracket fixed so as to face the right side and the left side of the head beam, respectively.
The leg frame has a leg side right bracket and a leg side left bracket fixed so as to face the right side and the left side of the leg beam, respectively.
The head and leg connecting mechanism is
A right parallel link formed between the head side right bracket and the leg side right bracket, and a left side parallel link formed between the head side left bracket and the leg side left bracket. ,
Consisting of
The right parallel link is
A front right link member having one end pivotably attached to the front side of the head side right bracket and the other end pivotally attached to the front side of the leg side right bracket with respect to the leg front side pivot axis; and One end is pivotally attached to the rear side of the head side right bracket so that it is substantially parallel to the front right link member, and the other end is rear side of the leg side right bracket and the rear side of the leg part. A rear right link member pivotally mounted with respect to the pivot axis;
Consisting of
The left parallel link is
A front left link member having one end pivotally attached to the head side left bracket and the other end pivotally attached to the leg side left bracket with respect to the leg front side pivot axis; and the front left One end is pivotally attached to the rear side of the head side left bracket so that it is substantially parallel to the link member, and the other end is pivoted to the rear side of the leg side left bracket. A rear left link member pivotally mounted with respect to the shaft,
Consisting of
The actuating means is fixed to the front right link member and the front left link member of the head / leg coupling mechanism, and is a shaft that also serves as the leg front pivot shaft, or the rear right link member of the head / leg coupling mechanism. And a shaft that is fixed to the rear left link member and also serves as the leg rear pivot shaft,
The transmitting means comprises rotating means for rotating the shaft such that the head frame moves forward relative to the leg frame when a backward force is applied to the backrest;
However, the seat of claim 1. The rotating means is
wire,
An attachment means for attaching one end of the wire to the shaft, and a pulling means for pulling the wire to rotate the shaft when a backward force is applied to the backrest;
Consisting of,
However, the seat of claim 2.   The seat according to claim 3, wherein the attachment means includes an arm that is fixed to an outer peripheral surface of the shaft and extends outward from a rotation axis of the shaft, and one end of the wire is attached to the arm. The pulling means has an L-shaped link member attached to the back frame so as to be pivotable in the front-rear direction,
The L-shaped link member has a portion that is long in the upward direction, a portion that is long in the rear direction, and a bent portion that connects these portions, and the L-shaped link member is the bent portion of the L-shaped link member. With respect to the longitudinal direction,
One press plate with the surface facing forward is attached to the upper part of the L-shaped link member in the upward direction,
The other end of the wire is connected to a long portion in the rearward direction of the L-shaped link member,
However, the seat of claim 3. The back frame is
Right and left frames arranged at left and right intervals,
An upper beam that is long in the left-right direction connecting the upper portions of the right and left frames, and a lower beam that is long in the left-right direction connecting the lower portions of the right and left frames,
Consisting of
The L-shaped link member is attached to the lower beam of the back frame so as to be pivotable in the front-rear direction.
However, the seat of claim 5. At least one of the right leg and the left leg is hollow, and one end of the wire is attached to the arm through the hollow leg.
However, the seat of claim 3.   When the head-and-leg connecting mechanism moves the head frame and the head-side left and right brackets in the front-rear direction with respect to the leg frame, the head-side right bracket moving direction and distance, and the head To connect the right and left link members on at least one side of the front right and left link members and the rear right and left link members so that the moving direction and distance of the part side left bracket coincide with each other. 3. The seat of claim 2, further comprising: link member coupling means.   9. The seat according to claim 8, further comprising locking means for limiting a distance of the head frame to move forward with respect to the leg frame and fixing the position of the head frame at the position moved by this distance. The link member connecting means comprises a connecting shaft long in the left-right direction for connecting the right and left link members on at least one side of the front right and left link members and the rear right and left link members,
The locking means comprises a hook attached to at least one of the leg side right bracket and the leg side left bracket;
When the head frame moves forward with respect to the leg frame, the connecting shaft is hooked to the hook, thereby limiting the distance of forward movement of the head frame with respect to the leg frame. The position of the head frame is fixed at a position moved by a distance,
However, the seat of claim 9. The rotating means is
Right and left wire,
Attachment means for attaching one end of each of the right and left wires to the shaft, and pulling the right and left wires to rotate the shaft when a backward force is applied to the backrest Tension means for,
Consisting of,
However, the seat of claim 2.   The attachment means is composed of right and left arms extending outwardly from the rotation axis of the shaft, fixed to the outer peripheral surface of the shaft with a space in the left-right direction, each one end of the right and left wires, 12. The seat of claim 11, wherein the seat is attached to each of the right and left arms. The pulling means has right and left L-shaped link members attached to the back frame so as to be pivotable in the front-rear direction,
The right and left L-shaped link members each have a portion that is long in the upward direction, a portion that is long in the rear direction, and a bent portion that connects these portions, and the right and left L-shaped link members are The respective bent portions of the right and left L-shaped link members are pivotable in the front-rear direction;
One press plate with the surface facing forward is attached to the upper part of each of the right and left L-shaped link members.
The other end of each of the right and left wires is connected to a rear long part of each of the right and left L-shaped link members.
However, the seat of claim 11. The back frame is
Right and left frames arranged at left and right intervals,
An upper beam that is long in the left-right direction connecting the upper portions of the right and left frames, and a lower beam that is long in the left-right direction connecting the lower portions of the right and left frames,
Consisting of
The right and left L-shaped link members are attached to the lower beam of the back frame so as to be pivotable in the front-rear direction at intervals in the left-right direction.
However, the seat of claim 13. The right leg and the left leg are each hollow, and one end of each of the right and left wires is attached to the right and left arms through the hollow right leg and left leg.
However, the seat of claim 11.

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