JPH11268566A - Automotive seat back - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automotive seat back for ensuring the behavior of an occupant and the sufficient actuation quantity of a head rest. SOLUTION: This seat back is constituted of a seat back frame 2, a head rest supporting arm 10 supported on an upper end part 2a of the frame 2 so as to be displaced fore and rear by a holding member 3, head rests 5 supported on the upper end part of the arm 10, and a pressure receiving member 6 supported on the lower end part of the arm 10 and receiving the pressure of the back of an occupant. The pressure receiving member 6 is arranged in the position corresponding the waist of the seated occupant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat back, and more particularly to a vehicle seat back structure for protecting a passenger's cervical spine during a rear-end collision.

[0002]

2. Description of the Related Art As a conventional seat back of an automobile, as shown in FIGS. 14 and 15 (see Japanese Patent Application Laid-Open No. 7-291005 and US Pat. No. 5,378,043), a seat back frame 2 of a seat back 1 is used. A headrest support arm 4 is fixedly mounted on a holding member 3 formed in a frame shape and supported on an upper end 2a thereof. A headrest 5 is supported on an upper end of the headrest support arm 4 and a pressure receiving member 6 is mounted on a lower end thereof. Supported.

[0003] For example, when a vehicle is hit by a rear impact, an impact load acts on the seat back 1 toward the front FR.
Due to the reaction, the upper body load of the occupant acts on the rear side RR. At this time, the pressure receiving member 6 moves to the rear side RR by the dimension S together with the S spring (not shown), so that the headrest support arm 4 rotates with the holding member 3 of the upper end portion 2a of the seat back frame 2 as a rotation fulcrum. Then, the headrest 5 supported on the upper end moves to the front FR by Y0 toward the occupant's head and operates close to the occupant's head (not shown).

[0004] Therefore, when the vehicle is hit, the occupant seated on the seat is prevented from rising to the rear of the vehicle diagonally upward, and the headrest 5 approaches the occupant's head instantaneously. 5 to ensure protection of the occupant's neck.

[0005]

However, in such a conventional technique, the occupant's sitting posture, particularly the driver's sitting posture, tends to bend forward. In this case, the upper back of the occupant and the seat Since the contact with the back is weak and the amount of pushing the pressure receiving member to the rear side is small, the operation amount of the headrest is small, and improvement is required.

The present invention has been made by paying attention to such a conventional technique, and an object thereof is to provide an automobile seat back in which the behavior of an occupant can be ensured and a sufficient operation amount of a headrest can be ensured.

[0007]

According to a first aspect of the present invention, there is provided a seat back frame, a headrest support arm supported on a top end of the seat back frame by a holding member so as to be displaced back and forth, and the headrest. An automobile seatback comprising: a headrest supported by an upper end of a support arm; and a pressure receiving member supported by a lower end of the headrest support arm and capable of receiving pressure on the back of an occupant, The pressure receiving member,
It is arranged at a position corresponding to the waist of a seated occupant.

According to a second aspect of the present invention, there is provided the vehicle seat back according to the first aspect, wherein the holding member supports the headrest support arm so as to be movable in a vertical direction. The support arm is characterized in that the support arm is inclined and supported such that the upper end portion is on the front side and the lower end portion is on the rear side.

According to a third aspect of the present invention, there is provided the automobile seat back according to the second aspect, wherein the headrest support arm is formed in an arc shape centered on a front side.

According to a fourth aspect of the present invention, there is provided the vehicle seat back according to the first aspect, wherein the holding member supports the headrest support arm movably in the vertical direction. The headrest support arm disposed at a position facing the member is vertically inclined and supported such that the lower end of the headrest support arm is rearward. .

According to a fifth aspect of the present invention, there is provided an automobile seat back according to any one of the first to fourth aspects, wherein:
The holding member is arranged in a direction along a moving direction of the headrest support arm.

According to a sixth aspect of the present invention, there is provided the vehicle seat back according to the first aspect, wherein a connecting member is rotatably supported at a lower end of the headrest support arm, and the connecting member is rotatably supported. A lower end portion of the member and the seat back frame are rotatably supported by respective via intervening members, and the pressure receiving member is coupled to a lower end portion of the connecting member.

According to a seventh aspect of the present invention, there is provided the vehicle seat back according to the first aspect, wherein a connecting member is rotatably supported at a lower end of the headrest supporting arm. A lower end portion and the seat back frame are rotatably supported by respective via intervening members, and an upper end portion of the connecting member and a shoulder portion of the seat back frame are respectively interposed via a second intervening member. The pressure receiving member is rotatably supported by a shaft, and the pressure receiving member is coupled to a lower end portion of the connecting member.

According to an eighth aspect of the present invention, there is provided the automobile seat back according to the first aspect, wherein a connecting member is rotatably supported at a lower end of the headrest support arm, and A lower end portion and the seat back frame are rotatably supported by an intervening member, respectively, and a substantially intermediate portion between the upper and lower portions of the connecting member and a portion lower than a shoulder portion of the seat back frame have a second interposition. The pressure receiving member is rotatably supported by each of the members via a member, and the pressure receiving member is coupled to a lower end of the connecting member.

According to a ninth aspect of the present invention, there is provided the automobile seat back according to the first aspect, wherein a connecting member is rotatably supported at a lower end of the headrest support arm. A lower end portion and the seat back frame are rotatably supported by respective via intervening members, and an upper end portion of the connecting member and a shoulder portion of the seat back frame are respectively interposed via a second intervening member. Rotatably supported, the interposed member and the second interposed member are rotatably connected by a third interposed member, and the pressure receiving member is connected to a lower end of the connecting member. I do.

According to a tenth aspect of the present invention, there is provided the automobile seat back according to the first aspect, wherein the holding member comprises:
The headrest support arm, which supports the headrest support arm so as to be movable in the vertical direction, and is formed in a substantially linear shape or an arc shape centered on the front side, the upper end of the headrest support arm is located on the front side. The lower end of the headrest support arm is supported at a lower end of the headrest support arm so as to be rotatable. The lower end of the connecting member and the seat back frame are Are respectively rotatably supported via intervening members, or a second intervening member is rotatably supported on the seat back frame via intervening members, or an intervening member and a second intervening member are connected to each other by a third intervening member. And the pressure receiving member is connected to a lower end of the connection member.

[0017]

According to the first aspect of the present invention, since the pressure receiving member is disposed at a position corresponding to the lumbar portion of the occupant when the vehicle is hit, the occupant's waist in which the inertia force at the time of the rear impact quickly acts. , The headrest can be moved to the front side at an early timing.

Further, since the effective mass of the occupant's waist is large, the pressure receiving member can be reliably pushed to the rear side.
The headrest can be reliably moved to the front side.

According to the second aspect of the present invention, when the pressure receiving member is pushed rearward by the movement of the occupant due to the rear-end collision of the vehicle, the headrest support arm moves upward with respect to the holding member and the front side moves forward. , And as a result, the amount of forward movement of the headrest increases.

According to the third aspect of the present invention, when the pressure receiving member is pushed rearward by the movement of the occupant due to the rear-end collision of the automobile, the headrest support arm moves upward with respect to the holding member and the front side moves. As a result, not only does the amount of forward movement of the headrest increase, but also the holding member becomes smoother when the headrest support arm moves upward.

According to the fourth aspect of the present invention, when the vehicle is hit and the pressure receiving member is pushed rearward by the movement of the occupant, the upper and lower central portions of the headrest support arm move upward with respect to the holding member. When the lower side moves as the slide moves, the lower side moves to the front side, and as a result, the moving amount of the headrest to the front side increases.

According to the fifth aspect of the present invention, when the pressure receiving member is pushed rearward by the movement of the occupant due to the rear-end collision of the vehicle, the headrest support arm moves upward with respect to the holding member and moves forward with respect to the holding member. , But at this time,
Since the holding member is arranged in a direction along the moving direction of the headrest support arm, the headrest support arm can move more smoothly.

According to the sixth aspect of the present invention, when the vehicle is hit, the occupant's waist pushes the pressure receiving member backward by the occupant's inertia due to the occupant's inertia, whereby the intervening member is rotated and the pressure receiving member is rotated. Is moved upward and backward while being restricted, and the headrest rotates around the upper portion of the seat back frame.

According to the seventh aspect of the present invention, when the vehicle is hit, the occupant's waist pushes the pressure receiving member backward by the inertia force of the occupant, so that the intervening member and the second intervening member are formed. When rotated, the connecting member supporting the pressure receiving member moves upward and backward while being restricted, and the headrest behaves rotationally around the upper portion of the seat back frame.

According to the eighth aspect of the present invention, when the vehicle is hit, the occupant's waist pushes the pressure receiving member backward by the inertia force of the occupant, so that the intervening member and the second intervening member are formed. When rotated, the connecting member supporting the pressure receiving member moves upward and backward while being restricted, and the headrest behaves rotationally around the upper portion of the seat back frame.

According to the ninth aspect of the present invention, when the vehicle is hit, the occupant's waist pushes the pressure receiving member backward by the inertia force of the occupant. When rotated, by the third intervening member,
At the same time, the rotation becomes smoother and the connecting member supporting the pressure receiving member moves upward and backward while being regulated, and the headrest rotates around the upper part of the seat back frame. Become.

According to the tenth aspect of the present invention, when the vehicle is collided and the pressure receiving member is pushed rearward by the movement of the occupant due to the occupant's inertial force, the headrest support arm is moved relative to the holding member. The headrest moves forward as well as upward, and as a result, the amount of forward movement of the headrest increases. In addition, the interposed member or the interposed member and the second interposed member or the interposed member and the second interposed member are rotated, and the connecting member supporting the pressure receiving member moves upward and backward while being regulated, and the headrest is moved back and forth. It will rotate around the top of the frame.

[0028]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Note that FR is described as a front side, RR is a rear side, UP is an upper side, and DW is a lower side.

FIGS. 1 and 2 show a first embodiment of the present invention. A seat back 1 of an automobile comprises a seat back frame 2 and a headrest 5.

The seat back frame 2 is formed in a closed loop shape, and has an upper end 2a, side ends 2b and 2b hanging down from left and right ends of the upper end 2a, and the side end 2a.
b, 2b.

The headrest 5 is rotatably supported on the upper end 2a so that the headrest 5 is displaced back and forth by rotation of the holding member 3.
Is rotatable together with the holding member 3 in the front side FR and the rear side RR.

At the upper end of the headrest support arm 10, a headrest 5 is movably supported by an upper UP and a lower DW, and a plate-like connecting member 11 is welded to a lower end 10a of the headrest support arm 10. The pressure receiving member 6 is bridged between the lower end portions 11 a of the connecting member 11.

Therefore, according to the first embodiment, when the vehicle is hit, the pressure receiving member 6 is moved by the occupant (not shown), so that the rear side RR of the occupant's waist is moved by the movement size S.
When the pressure receiving member 6 moves from the position shown by the two-dot chain line to the position shown by the solid line, the connecting member 11 on which the pressure receiving member 6 is bridged corresponds to the waist of an occupant (not shown). Since the connecting member 11 is disposed at the position, the connecting member 11 rotates together with the holding member around the upper end 2a of the seat back 2, and the headrest 5 can be moved to the front FR by the dimension Y1 at an early timing.

Further, since the effective mass of the occupant (not shown) is large, the pressure receiving member 6 can be reliably pushed to the rear side RR, so that the headrest 5 can be reliably moved to the front side FR.

FIG. 3 shows a second embodiment of the present invention, which mainly differs from the first embodiment in the shape of the headrest support arm and the structure of the holding member.

The holding member 15 of this embodiment is not rotatably supported by the upper end 2a of the seat back frame 2 like the holding member 3 but is provided with the headrest support arm 16 itself in the front side FR and the rear side. It is supported by a seatback frame (not shown) so as to be able to move to the upper UP and the lower DW while maintaining the operation of the first embodiment allowing the movement to the side RR.

The holding member 15 has a ring shape, and is held by the seat back 1 with its opening 15a, that is, the portion where the headrest support arm 16 itself is inserted, inclined to the rear side RR.

The headrest support arm 16 of this embodiment is supported by the holding member 15 with its upper end 16a inclined to the front side FR and its lower end 16b inclined to the rear side RR. .

The headrest support arm 16 referred to here
The lower end portion 16b is not the lowermost portion of the headrest support arm 16 as a member, but is a term used to explain the gist of the invention, and the member extends further downward. ing. That is, the lower end portion 16b
From the upper end 11 of the connecting member 11
The extension portion 16c is fixed to b.

The lower end 11a of the arm 18 is rotatably supported at the same position as the upper end 2a of the seat back frame 2 by a first connecting pin 17 as a shaft support. Are rotatably supported by the second connecting pin 19.

Therefore, according to the second embodiment of the present invention, when the vehicle is hit, the pressure receiving member 6 is pushed into the rear side RR by the movement size S of the occupant's waist by the movement of the occupant (not shown). As the pressure receiving member 6 moves from the position shown by the two-dot chain line to the position shown by the solid line, the connecting member 11 on which the pressure receiving member 6 is
7 is guided by an arm 18 that rotates about
Go to Since the extension 16c of the headrest support arm 16 fixed to the connecting member 11 moves to the rear side RR, the lower end 16b of the headrest support arm 16 moves to the upper side UP with respect to the holding member 15. The headrest 5 moves to the front side FR, and as a result, the headrest 5 moves to the front side FR by the dimension Y2, and moves to the upper side UP by the dimension Z1.

FIG. 4 shows a modification of the second embodiment of the present invention. The main difference from the embodiment shown in FIG. 3 lies in the shape of the headrest support arm.

The headrest support arm 2 of this embodiment
0 is formed in an arc shape centering on the front side FR.
Other details are the same as those of the embodiment shown in FIG.

Therefore, according to the modified example of the second embodiment of the present invention, when the vehicle is hit and the pressure receiving member 6 is pushed into the rear side RR by the movement of the occupant (not shown), the holding member 15 Headrest support arm 20
Moves to the upper side UP and to the front side FR. As a result, not only does the amount of movement of the headrest 5 toward the front side FR increase, but also the holding member 15 becomes smoother when the headrest support arm 20 moves to the upper side UP. .

FIG. 5 shows still another modification of the second embodiment of the present invention. The main difference from the embodiment shown in FIG. 3 lies in the shape of the headrest support arm.

Headrest support arm 2 of this embodiment
5 is tilted and supported such that its upper and lower center portions 26 are on the front side FR and its lower end portions 27 are on the rear side RR.

The headrest support arm 25 referred to here
Is not the lowermost part of the headrest support arm 25 as a member, but is a term used to explain the gist of the invention.
It extends further below. That is, as shown in FIG. 3, the connecting member 11 extends from the lower end portion 27 to the front side FR.
The lower extension 28 is fixedly provided at the upper end 11b of the lower end.
Similarly, the upper end 26 of the headrest support arm 25 is
It is not the meaning of the uppermost part of the headrest support arm 25 as a member, but is a term used to explain the gist of the invention, and extends further upward as a member. That is, the upper extending portion 2 extends from the upper end portion 26 to the rear side RR and supports the headrest 5.
9 are extended.

Therefore, according to a further modified example of the second embodiment of the present invention, when the vehicle is hit and the pressure receiving member 6 is pushed into the rear side RR by the movement of an occupant (not shown), the holding member 15 In contrast, the lower end portion 27 moves as the upper and lower central portion 26 of the headrest support arm 25 slides upward and moves to the front FR, and as a result, the amount of movement of the headrest 5 to the front FR increases. Will be.

FIG. 6 shows a second modification of the second embodiment of the present invention, which is different from the embodiment shown in FIG. 3 mainly in the orientation of the holding members.

The holding member 30 of this embodiment is arranged in the moving direction of the headrest support arm 16, that is, in the direction along the upper end 16a and the lower end 16b of the headrest support arm 16.

Therefore, according to a further modification of the second embodiment of the present invention, when the vehicle is hit and the pressure receiving member 6 is pushed into the rear side RR by the movement of an occupant (not shown), the holding member 30 is pressed. , The headrest support arm 16 moves upward and slides forward FR. At this time, the holding member 30 moves in the moving direction of the headrest support arm 16, that is, the upper end 16a of the headrest support arm 16. And the lower end 16b, the headrest support arm 16
You will be able to move more smoothly.

FIGS. 7 and 8 show a third embodiment of the present invention. The main difference from the first embodiment shown in FIG. 1 is that the connecting member is rotated with respect to the headrest support arm. This is a point that the seat back frame and the connecting member are connected to each other.

The upper end 35 of the connecting member 35 of this embodiment
a is a lower end 10a of the headrest support arm 10.
The lower end 35b of the connecting member 35 and the seat back frame 2 are connected to each other via a plate-shaped intervening member 36.
The pressure receiving member 6 is rotatably supported by a connecting pin 38 and a fifth connecting pin 39, respectively, and is connected to the lower end 35b of the connecting member 35 to be bridged.

Therefore, according to the third embodiment of the present invention, when the vehicle is hit, the inertia force of the occupant (not shown) causes the pressure receiving member 6 to move the waist of the occupant by the movement dimension S of the occupant. Only by pushing it into the rear side RR, the pressure receiving member 6 at the position shown by the two-dot chain line in FIG. 8 moves to the position shown by the solid line, whereby the interposition member 36 is rotated and supports the pressure receiving member 6. The connecting member 35 is an intervening member 36
The headrest 5 moves to the upper side FR and the rear side RR while being restricted by the holding member 3 and the headrest 5 rotates around the upper end 2 a of the seat back frame 2.

FIGS. 9 and 10 show a fourth embodiment of the present invention. The main difference from the first embodiment shown in FIG. 1 is that the connecting member is rotated with respect to the headrest support arm. This is a point that the seat back frame and the connecting member are connected with an intervening member that is vertically separated.

The upper end 35 of the connecting member 35 of this embodiment
a is a lower end 10a of the headrest support arm 10.
The lower end 35b of the connecting member 35 and the seat back frame 2 are connected to each other via a plate-shaped intervening member 36.
The upper end 35a of the connecting member 35 and the shoulder 2c of the seat back frame 2 are rotatably supported by a connecting pin 38 and a fifth connecting pin 39, respectively, via a second intervening member 40. Third connecting pin 37 and sixth
Each of the pressure receiving members 6 is rotatably supported by a connection pin 41 so that the pressure receiving member 6 is connected to a lower end 35b of the connection member 35.
It is erected by being connected to.

Therefore, according to the fourth embodiment of the present invention, when the vehicle is hit, the inertia of the occupant (not shown) causes the pressure receiving member 6 to move the waist of the occupant by the moving distance S of the occupant. 8, the pressure receiving member 6 at the position shown by the two-dot chain line in FIG. 8 moves to the position shown by the solid line, whereby the interposition member 36 and the second interposition member 40 are rotated, and the pressure receiving member 6 is rotated. 6 is moved to the upper side FR and the rear side RR while being regulated by the intervening member 36, the second intervening member 40, and the holding member 15, and the headrest 5 is moved to the upper end of the seat back frame 2. It behaves rotationally about the portion 2a.

FIG. 11 shows a fifth embodiment of the present invention. The main difference from the first embodiment shown in FIG. 1 is that the connecting member is rotatable with respect to the headrest support arm. The point is that the seat back frame and the connecting member are connected by an intervening member vertically separated.

The upper end 35 of the connecting member 35 of this embodiment
a is a lower end 10a of the headrest support arm 10.
The lower end 35b of the connecting member 35 and the seat back frame 2 are connected to each other via a plate-shaped intervening member 36.
The connecting pin 38 and the fifth connecting pin 39 are each rotatably supported by a shaft, and a substantially lower middle portion 35c of the connecting member 35 and a portion lower than the shoulder portion 2c of the seat back frame 2 are second. The pressure receiving member 6 is rotatably supported by a sixth connecting pin 41 and a seventh connecting pin 45 via an intervening member 40. The pressure receiving member 6 is connected to a lower end portion 35b of the connecting member 35 so as to be installed. Be done.

Therefore, according to the fifth embodiment of the present invention, when the vehicle is hit, the inertia of the occupant (not shown) causes the pressure receiving member 6 to move the waist of the occupant by the moving distance S of the occupant. 8, the pressure receiving member 6 at the position shown by the two-dot chain line in FIG. 8 moves to the position shown by the solid line, whereby the interposition member 36 and the second interposition member 40 are rotated, and the pressure receiving member 6 is rotated. 6 moves to the upper side FR and the rear side RR while being restricted by the intervening member 36 and the second intervening member 40 and the holding member 15, and the headrest 5 is moved to the upper end of the seat back frame 2. It behaves rotationally about the portion 2a.

FIGS. 12 and 13 show a sixth embodiment of the present invention. The main difference from the first embodiment shown in FIG. 1 is that the connecting member is rotated with respect to the headrest support arm. This is a point that is made freely, a point that the seat back frame and the connecting member are connected by an intervening member vertically separated, and a point that the intervening member is connected by another member.

The upper end 35 of the connecting member 35 of this embodiment
a is a lower end 10a of the headrest support arm 10.
The lower end 35b of the connecting member 35 and the seat back frame 2 are connected to each other via a plate-shaped intervening member 36.
The upper end 35a of the connecting member 35 and the shoulder 2c of the seat back frame 2 are rotatably supported by a connecting pin 38 and a fifth connecting pin 39, respectively, via a second intervening member 40. Sixth connecting pin 41 and third
The connecting pin 37 is rotatably supported by each of the connecting pins 37.
The third intermediate member 50 is rotatably connected to the intermediate portion of the first connecting member by an eighth connecting pin 51 and a ninth connecting pin 52, and the pressure receiving member 6 is connected to the lower end 3 of the connecting member 35.
5b.

Therefore, according to the sixth embodiment of the present invention, when the vehicle is hit, the inertia of the occupant (not shown) causes the pressure receiving member 6 to move the waist of the occupant by the movement size S of the occupant. When the pressure receiving member 6 at the position shown by the two-dot chain line in FIG. 8 is moved to the position shown by the solid line by pushing it into the rear side RR, when the interposition member 36 and the second interposition member 40 are rotated, By the third interposition member 50,
At the same time, the rotation is smoother, and the connection member 35 supporting the pressure receiving member 6 is regulated by the intervening member 36 and the second intervening member 40 and the holding member 15 while the upper FR In addition, the headrest 5 moves to the rear side RR, and the headrest 5 rotates around the upper end 2 a of the seat back frame 2.

According to the above description, although not shown, the holding member 15 or 30 supports the headrest support arm 10 or 16, 20, 25 so as to be movable in the vertical direction. , 2
The headrest support arms 16 and 20 are connected to the headrest support arms 16 and 20 at an angle such that the upper ends 16a and 20a are on the front side FR and the lower ends 16b and 20b are on the rear side RR. 35 is rotatably supported by a third connection pin 37, and the lower end 35b of the connection member 35 and the seat back frame 2 are rotatably supported by an intervening member 36, respectively. Alternatively, the second intervening member 40 is rotatably supported by the seat back frame 2 or the intervening member 36 and the second intervening member 40 are rotatably connected by the third intervening member 50, The pressure receiving member 6 is a lower end 35b of the connecting member 35.
May be combined with the same.

In such a case, the vehicle is collided, and the occupant's waist pushes the pressure receiving member 6 toward the rear side RR by the moving distance of the occupant by the inertia force of the occupant. By moving, the intervening member 36
All or any of the second and third intervening members 40 and 50 are rotated, and the connecting member 35 supporting the pressure receiving member 6 is connected to the intervening member 36 and the second intervening member 40 with the holding member 15 or 30. The headrest 5 moves to the upper side FR and the rear side RR while being restricted by the above, so that the headrest 5 rotates around the upper end 2 a of the seat back frame 2.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of a seat back according to a first embodiment of the present invention.

FIG. 2 is a side view showing the operation of FIG.

FIG. 3 is a side view corresponding to FIG. 2 according to a second embodiment of the present invention.

FIG. 4 is a side view corresponding to FIG. 3, showing a modification of FIG. 3;

FIG. 5 is a side view corresponding to FIG. 3, showing another modification of FIG. 3;

FIG. 6 is a side view corresponding to FIG. 3, showing still another modified example of FIG. 3;

FIG. 7 is a perspective view corresponding to FIG. 1 according to a third embodiment of the present invention.

FIG. 8 is a side view showing the operation of FIG. 7;

FIG. 9 is a perspective view corresponding to FIG. 1 according to a fourth embodiment of the present invention.

FIG. 10 is a side view showing the operation of FIG. 9;

FIG. 11 is a perspective view corresponding to FIG. 1 according to a fifth embodiment of the present invention.

FIG. 12 is a perspective view corresponding to FIG. 1 according to a sixth embodiment of the present invention.

FIG. 13 is a side view showing the operation of FIG.

FIG. 14 is a perspective view corresponding to FIG. 1 according to a conventional example.

FIG. 15 is a side view showing the operation of FIG. 14;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seat back 2 Seat back frame 2a Upper end of seat back frame 2b Side end of seat back frame 2c Shoulder of seat back frame 3, 15, 30 Protective member 4, 16, 20, 25 Headrest support arm 5 Headrest 6 Pressure receiving Members 11, 35 Connecting member 12a Lower end of fixed stay corresponding to lower end of stay 17 First connecting pin 18 as shaft support 18 Arm 26 Vertical center of headrest support arm 27 Lower end of headrest support arm 36 Intervening member 40 2 Interposed member 50 3rd Interposed member FR Front side RR Rear side UP Upper side DW Lower side

Claims (10)

[Claims] 1. A seatback frame, a headrest support arm supported at the upper end of the seatback frame by a holding member so as to be displaced back and forth, and a headrest supported at an upper end of the headrest support arm. An automobile seat back supported by a lower end portion of the headrest support arm and configured to receive a pressure on an occupant's back, wherein the pressure receiving member is located at a position corresponding to a waist of a seated occupant. An automobile seat back characterized by being arranged. 2. The automobile seat back according to claim 1, wherein the holding member supports the headrest support arm so as to be movable in a vertical direction, and the headrest support arm has an upper end portion. The seat back for an automobile is characterized in that the seat back is tilted and supported such that the lower end is on the rear side. 3. The vehicle seat back according to claim 2, wherein the headrest support arm is formed in an arc shape centered on a front side. 4. The vehicle seat back according to claim 1, wherein the holding member supports the headrest support arm movably in the vertical direction, and is disposed at a position facing the holding member. A seat back for an automobile, wherein the headrest support arm is tilted and supported such that the upper and lower central portions of the headrest support arm face forward and the lower end of the headrest support arm faces rearward. 5. The vehicle seat back according to claim 1, wherein the holding member is arranged in a direction along a moving direction of the headrest support arm. Car seat back. 6. The vehicle seat back according to claim 1, wherein a connection member is rotatably supported at a lower end of the headrest support arm, and a lower end of the connection member and the seat. With the back frame,
An automobile seat back, wherein the pressure receiving member is rotatably supported by an intervening member, and the pressure receiving member is coupled to a lower end of the connecting member. 7. The vehicle seat back according to claim 1, wherein a connecting member is rotatably supported at a lower end of the headrest support arm, and a lower end of the connecting member and the seat are provided. With the back frame,
Each is rotatably supported via an intervening member, and the upper end of the connecting member and the shoulder of the seat back frame are rotatably supported via a second intervening member. A seat back for an automobile, wherein the pressure receiving member is coupled to a lower end portion of the connecting member. 8. The vehicle seat back according to claim 1, wherein a connecting member is rotatably supported at a lower end of the headrest support arm, and a lower end of the connecting member and the seat are connected to each other. With the back frame,
Through the intervening member, while being rotatably supported by each, the upper and lower substantially middle portion of the connecting member and the portion lower than the shoulder of the seat back frame, via the second intervening member, respectively A seat back for an automobile, wherein the pressure receiving member is rotatably supported on the vehicle and the pressure receiving member is coupled to a lower end of the connecting member. 9. The vehicle seat back according to claim 1, wherein a connecting member is rotatably supported at a lower end of the headrest support arm, and a lower end of the connecting member and the seat. With the back frame,
Each is rotatably supported via an intervening member, and the upper end of the connecting member and the shoulder of the seat back frame are rotatably supported via a second intervening member. The intervening member and the second intervening member are rotatably connected by a third intervening member, and the pressure receiving member is connected to a lower end of the connecting member. . 10. The vehicle seat back according to claim 1, wherein the holding member supports the headrest support arm so as to be movable in a vertical direction, and is substantially linear or centered on the front side. The headrest support arm, which is formed in an arc shape, is supported by being inclined such that its upper end is on the front side and its lower end is on the rear side.The lower end of the headrest support arm has A connecting member is rotatably supported by the shaft, and a lower end of the connecting member and the seat back frame are
The seat back frame is rotatably supported by the respective intervening members, or the second intervening member is rotatably supported by the seat back frame, or the interposed member and the second interposed member are rotated by the third interposed member. An automobile seat back, which is freely connected, and wherein the pressure receiving member is connected to a lower end of the connection member.