JP2001163097A - Vehicular seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular seat capable of mitigating impact force to an occupant during a collision, blocking movement of the occupant along a face of a seat back, and suppressing a rebound phenomenon. SOLUTION: When a rear collision occurs, the occupant moves toward a direction of the seat back 42 from hip part first. When a predetermined load is applied to the seat back 42 by the hip part of the occupant, a seat back frame 22 (hereinafter referred to as frame 22) rotates around a connecting member 18 in resistance to an elastic force of a coiled torsion spring. In the frame 22, its lower end part moves to a vehicular rear side and its upper end part moves toward an occupant side for forwardly tilting it. In a moved state of the frame 22, a pawl lever 30 is engaged to a ratchet 20 and the frame 22 is held in that position. Thus, the impact force from the occupant can be absorbed by the rotation of the frame 22, the movement of the occupant along the face of the seat back 42 can be avoided by being forwardly tilted, and the rebound phenomenon can be suppressed by holding the frame 22 at a rotated position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat disposed inside a vehicle such as an automobile.

[0002]

2. Description of the Related Art Conventionally, some vehicle seats used for automobiles and the like are known to protect a seated occupant in the event of a collision from the rear of the vehicle (hereinafter, referred to as "rear collision"). .

As one example, as shown in FIG. 8, in a vehicle shock absorbing sheet 100 described in Japanese Patent Application Laid-Open No. 10-278644, reclining devices 104 are provided on both sides of a seat cushion 102. A side bracket 110 of a seat back frame 108 is attached to a rotating arm 106 of the reclining device 104 by attaching bolts 112 and rivets 114. A seat back 109 is attached to the seat back frame 108. Here, a series of substantially elliptical impact absorbing holes 116 are formed in the side bracket 110, and an expanding hole 118 that functions as a strength weak portion that buckles and deforms due to an impact at the time of a rear collision is formed. I have. Further, an engagement pin 120 integrally projecting from the rotation arm 106 is provided in the shock absorption hole 116 located at the uppermost stage.
(Prior Art 1).

According to the vehicle impact absorbing sheet 100, when a rear collision of the vehicle occurs, a load from the upper body of the occupant who has moved rearward due to the impact acts on the seat back frame 108. When the load exceeds the rigidity of the widening hole 118, buckling deformation occurs in the widening hole 118, and the seatback frame 108 is deformed and tilted rearward. Further, the seat back frame 108 rotates around the mounting bolt 112 and tilts rearward. At this time, the engagement pin 120 located in the uppermost shock absorbing hole 116 breaks the barrier between the shock absorbing holes 116, and finally moves to the lowermost shock absorbing hole 116. As a result, the impact energy is absorbed by the buckling deformation at the widening hole 118, the breakage of the barrier of the impact absorbing hole 116, and the like, so that damage to the occupant is reduced.

Further, as shown in FIG.
The vehicle seat 130 described in Japanese Patent No. 19619 has a seat back frame 132. A seat back (not shown) is attached to the seat back frame 132. Here, the seat back frame 13
A support member 134 is attached to the upper end of 2, and a rotation member 138 is attached to the support member 134 via a rotation hinge 136. A horizontal frame member 140 is attached to each of the rotating members 136, and the horizontal frame member 140 further includes a headrest 1
42 are attached. Also, the horizontal frame member 14
One end of an impact pressure receiving plate 144 is attached to 0, and the pressure receiving portion 144A of the impact pressure receiving plate 144 is located at the center of the seat back frame 132.
Further, a coil spring 146 is connected to the rotating member 136 and the supporting member 134, and the coil spring 146 urges the rotating member 136 so as to prevent the rotating member 136 from rotating under a predetermined load. (Prior art 2).

[0006] According to the vehicle seat 130, when the vehicle collides rearward, the occupant moves to the rear of the vehicle due to inertial force,
The impact pressure plate 144 is pressed. Impact pressure plate 14
When 4 is pressed, the rotating member 136 rotates against the elastic force of the coil spring 146. Due to the rotation of the rotating member 136, the headrest 142 is pushed to the front side of the vehicle. Therefore, the rearward movement of the occupant's head can be supported at a close distance, and the impact acting on the occupant's head and neck can be reduced.

[0007]

Here, even when the occupant is seated with the back of the occupant in contact with the seat back, the occupant is usually relatively far from the seat back and the headrest from the shoulder to the head. . When a rear collision occurs in this state, the occupant receives the inertial force and moves rearward in the seated state, and the occupant's waist first presses the seat back. Subsequently, the back of the occupant presses the seat back. Thereafter, the occupant's waist moves away from the seat back due to the rebound phenomenon caused by the reaction force of the seat back.

By the way, in the above prior art 1, after a rear collision,
Since the seatback frame buckles and leans backward due to collision with the occupant's back, the rebound phenomenon is suppressed. However, since the seatback remains in the rearwardly inclined state, the occupant may move diagonally upward along the inclined surface of the seatback due to inertia, and the head of the occupant may exceed the headrest. There is a risk that the head of the occupant cannot be sufficiently supported. Further, since the seat back frame is buckled and deformed, there is a problem in reusing the seat back frame.

On the other hand, in the prior art 2, since the pressure receiving portion of the impact pressure receiving plate is located at the center of the seat back, that is, in the vicinity of the scapula of the occupant, the collision load from the occupant cannot be properly received. As a result, there is a possibility that the headrest interlocking with the impact pressure plate does not approach sufficiently to hold the occupant's head. Also, after the occupant's back presses the impact pressure plate, the elastic force of the coil spring acts to rotate the impact pressure plate in the opposite direction, which may cause a rebound phenomenon in which the occupant's back is pushed back to the front of the vehicle, When the rebound phenomenon occurs, there is also a problem that the occupant's chest and abdomen are pressed by the seat belt.

In view of the above, the present invention reduces the impact force on the occupant generated at the time of a rear collision, prevents the occupant from moving along the seat back surface, suppresses the rebound phenomenon, and reduces the occupant's chest. It is an object to provide a vehicle seat capable of effectively protecting the abdomen and the neck.

[0011]

According to a first aspect of the present invention, there is provided a vehicle seat including a seatback for supporting a back and a waist of an occupant and a headrest for supporting a head of the occupant, A support member provided inside the seat back, and a seat that is rotatably supported by the support member, rotates when the occupant's waist presses the seat back with a predetermined load due to a collision from the rear of the vehicle, and pushes the headrest toward the occupant. A back frame and a holding member provided on the support member or the seat back frame and holding the seat back frame at a position where the seat back frame is rotated are provided.

According to this configuration, the seat back frame is rotatably supported by the support member. here,
When a predetermined load acts on the seat back frame, the seat back frame rotates and pushes the headrest toward the occupant. The rotated seat back frame is held at the rotated position by the holding member.

That is, when a predetermined load acts on the seat back frame, the seat back frame rotates and the headrest is pushed out toward the occupant, and the seat back assumes a so-called forward leaning posture. It can absorb and can prevent the occupant from moving upward along the seat back.

Further, since the headrest is pushed toward the occupant, the movement of the occupant's head in the headrest direction can be reduced and the head can be supported, so that the occupant's head can be stably protected. Further, after the seat back frame is rotated, the seat back frame is held by the holding member in that state, so that the seat back frame does not rotate in the reverse direction, so that the occupant is not pushed back by the reaction force of the seat back, and the reaction force of the seat back is reduced. Can be reliably suppressed.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a vehicle seat according to an embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a perspective view of a vehicle seat according to the present invention. Hereinafter, the vehicle seat 10 provided in the automobile will be described.

As shown in FIG. 1, the vehicle seat 10 is provided with a seat cushion 12 on which an occupant 11 (see FIG. 6) sits. Reclining devices 14 are attached to both sides of the rear end of the seat cushion 12.

At the upper end of the reclining device 14, a seat side wall frame 16 as a support member is fixed. The seat side wall frame 16 has a triangular side surface portion 16A whose lower side (the seat cushion 12 side) is wide.
It has. A front piece 16B that projects substantially vertically is formed on the vehicle front side of the side face 16A. Also,
A rear piece 16C is formed on the vehicle rear side of the side face 16A so as to substantially vertically protrude so as to face the front piece 16B. Further, the lower side of the side portion 16A (the seat cushion 1)
On the second side) as well, a bottom portion 16D protruding substantially vertically is formed. In addition, this seat side wall frame 16
It is integrally formed by a mold or the like.

A cylindrical connecting member 18 is integrally formed on the upper portion of the side surface 16A. This connecting member 18
The front piece 16B and the rear piece 1 project from the side face 16A.
6C and the same direction as the bottom surface 16D. In addition,
It is preferable that the connecting member 18 is formed in a range from the lower corner point of the scapula of the occupant 11 to the spine point. Further, a ratchet 20 that engages with a claw lever 30 described later and functions as a holding member is provided on the bottom surface 16D.

A gate-shaped seat back frame 22 is used for the vehicle seat 10, and a seat spring 21 is stretched between the seat back frames 22. As shown in FIG. 2, the seat back frame 22
A through-hole (not shown) is formed in both side portions 22A, and the connecting member 18 is inserted through the through-hole via a coil torsion spring 24 functioning as a rotating member. Therefore, the seat back frame 22 rotates about the connecting member 18. The rigidity of the coil torsion spring 24 is set so that when a load equal to or more than a predetermined value is applied to the seat back frame 22, the coil torsion spring 24 rotates about the connecting member 18.

Further, a semi-cylindrical mounting portion 26 is formed on the side surface portion 16A, and one end of the coil torsion spring 24 is fixed to the mounting portion 26. The other end of the coil torsion spring 24 is fixed to both side portions 22 </ b> A of the seat back frame 22. This coil torsion spring 2
4, the seat back frame 22 is in a normal state (a state in which a predetermined load is not applied to the seat back frame 22, the same applies hereinafter).
Is biased such that the lower end of the seat back frame 22 is located on the front side of the vehicle, and the upper end of the seat back frame 22 is located on the rear side of the vehicle (the state shown by the solid lines in FIGS. 4 and 6).

As shown in FIG. 3, a lower end of both sides 22A of the seat back frame 22 is provided with a cylindrical shaft 28.
Are formed. A claw lever 30 is rotatably attached to the shaft 28. Specifically, the claw lever 30
Is formed with an opening (not shown), through which the shaft 28 is inserted. As a result, the pawl lever 30 rotates about the shaft 28.

Here, the claw lever 30 has a body 30A having an opening. An engaging portion 30B is formed integrally with the body 30A. The engaging portion 30B engages with the claw portion 20A of the ratchet 20 described above.

In the vicinity of the engaging portion 30B, a through hole 32 is provided.
Are formed. The through-hole 32 has a coil spring 3
4 is attached to one end. On the other hand, the coil spring 34
Is attached to a support piece 36 integrally formed on both sides 22A of the seat back frame 22. Further, the coil spring 34 is in a state where the engaging portion 30A of the pawl lever 30 and the pawl portion 20A of the ratchet 20 are engaged (FIG. 4).
Is set to be shorter than the natural length. Therefore, when the engaging portion 30B of the claw lever 30 and the claw portion 20A of the ratchet 20 are engaged, the claw lever 30 presses the ratchet 20 by the elastic force of the coil spring 34, so that the seat back frame 22 cannot move. .

The claw lever 30 is configured to be detachable from the shaft 28.
By removing the 0 from the shaft 28, the seat back frame 22 can be easily moved in the reverse direction and returned to the original state (the state shown in FIG. 4). Thus, the vehicle seat 10 can be reused after the collision accident.

As shown in FIG. 1, a seat back 42 functioning as a cushion member is attached to the outer periphery of the seat back frame 22 and the seat side wall frame 16. Due to the seat back 42, the back 11B and the waist 11C of the occupant 11 (hatched portion in FIG. 6).
Is supported. A headrest 38 is attached to the horizontal portion 22B of the seat back frame 22 via a stay 40 (see FIG. 6). The headrest 38 supports the head 11A of the occupant 11.

Next, the operation and effects of the vehicle seat 10 will be described.

First, the behavior of the upper body of the occupant 11 when a collision occurs from the rear of the vehicle (hereinafter referred to as "rear collision") will be described.

The occupant 11 sits on the seat cushion 12 with the occupant 11 from the waist 11C to the back 11B in contact with the seat back 42, and the neck 11D and the head 11A of the occupant 11 separated from the seat back 42 and the headrest 38. In the case of a rear collision, the occupant 11 moves to the rear of the vehicle, that is, in the direction of the seat back 42 due to the inertial force, and first, as shown in FIG.
C presses the seat back 42 (immediately after the collision). next,
The back 11B of the occupant presses the seat back 42.
At this time, as shown in FIG.
1D also pushes the seat back 42 (middle of collision). Thereafter, as shown in FIG. 7C, a rebound phenomenon due to a reaction force acting on the occupant 11 from the seat back 42 causes
The waist 11C of the occupant 11 is separated from the seat back 42.
At this time, the occupant's neck 11D remains pressed against the seat back 42 (late collision).

Here, as shown by the solid lines in FIGS. 4 and 6, the seat back frame 22 is normally
The engaging portion 30B of the claw lever 30 is the claw portion 2 of the ratchet 20.
Since it is engaged with 0A, it does not move in the direction of arrow A in FIG. That is, the elastic force of the coil torsion spring 24 acts on the seat back frame 22 and the claw lever 3
The elastic force acts from the coil spring 34 on the engaging portion 30B of the ratchet 20.
, The seat back frame 22 does not move and is held at the engagement position.

The waist 11C of the occupant 11 is
Is pressed, and a load greater than a predetermined amount acts on the seat back frame 22, the seat back frame 22 rotates about the connecting member 18 against the elastic force of the coil torsion spring 24 and the coil spring 34. At this time, in the seat back frame 22, the lower end of the seat back frame 22 moves toward the vehicle rear (in the direction of arrow A in FIG. 4), and the upper end of the seat back frame 22 moves in front of the vehicle (in the direction of arrow B in FIG. 4). It moves to the side so that it is in a forward leaning state. At the same time, the horizontal portion 22B located at the upper end of the seat back frame 22 moves toward the front of the vehicle, and the headrest 38 is pushed out toward the occupant 11 moving backward.

As described above, when a predetermined load is applied from the waist 11C of the occupant 11, the seat back frame 22 rotates about the connecting member 18, so that the impact force from the occupant 11 can be absorbed and the seat back frame 22 can be absorbed. Since the back frame 22 is inclined forward, it is possible to prevent the upper body of the occupant 11 from moving obliquely upward along the seat back (surface) 42 as in the related art. Further, since the headrest 38 is pushed toward the occupant 11 moving backward, the movement of the head 11A can be reduced, and the head 11A can be stably supported at a close distance to the head 11A.

5 and 6, when the seat back frame 22 has finished moving, the engaging portion 30B of the pawl lever 30 is engaged with the pawl 20 of the ratchet 20. As shown in FIG.
A, and the seat back frame 22 is held at that position.

Since the seat back frame 22 or the seat back 42 does not move in the direction opposite to the direction of arrow A in FIG. 4, the rebound phenomenon in which the upper body of the occupant 11 is pushed back by the reaction force from the seat back 42 is suppressed. You. As a result, the situation in which the chest and abdomen of the occupant 11 are squeezed by the seat belt (not shown) can be avoided, and the safety of the occupant 11 can be ensured.

In the above embodiment, the coil torsion spring 24 is exemplified as the rotating member. However, the present invention is not limited to this.
Any device or structure that can rotate the seat back frame 22 about the connecting member 18 when a predetermined load is applied to the seat back frame 22 may be used.

Although the ratchet 20 and the claw lever 30 have been illustrated as the holding members, the invention is not limited thereto, and any mechanism capable of holding the seat back frame 22 at the rotational position may be used.

The vehicle seat 10 is not limited to an automobile, but can be applied to a general vehicle.

[0037]

According to the vehicle seat of the present invention, the impact force on the occupant generated at the time of a rear collision is reduced, the occupant is prevented from moving along the seat back surface, the rebound phenomenon is suppressed, and the occupant's chest is reduced. , Can protect the abdomen and neck effectively.

[Brief description of the drawings]

FIG. 1 is a perspective view of a vehicle seat according to an embodiment of the present invention.

FIG. 2 is a partially enlarged view showing a rotation mechanism of a vehicle seat according to one embodiment of the present invention.

FIG. 3 is a partially enlarged view showing a vehicle seat holding member according to an embodiment of the present invention.

FIG. 4 is a view showing a state before a predetermined load is applied to a seat back frame constituting the vehicle seat of the present invention.

FIG. 5 is a view showing a state after a predetermined load is applied to a seat back frame constituting the vehicle seat according to the present invention.

FIG. 6 is an operation diagram of the vehicle seat of the present invention.

FIG. 7 is a pressing force distribution diagram showing a distribution of a pressing force applied to a seat back by a waist and a neck of an occupant.

FIG. 8 is a configuration diagram of a conventional vehicle impact absorbing sheet.

FIG. 9 is a configuration diagram of a conventional vehicle seat.

[Explanation of symbols]

 Reference Signs List 10 vehicle seat 11 occupant 11A head 11B back 11C waist 16 seat side wall frame (supporting member) 20 ratchet (holding member) 22 seat back frame 30 claw lever (holding member) 38 headrest 42 seat back

Continuation of the front page (72) Inventor Kazio Miki 41-cho, Yokomichi, Nagakute-cho, Aichi-gun, Aichi Prefecture F-term (reference) at Toyota Central Research Laboratory, Inc. 3B084 DB07 DB14 DC02 DD07 GA01 3B087 CD02 CD03 DB02 DB04

Claims (1)

[Claims] 1. A vehicle seat having a seat back for supporting a back and a waist of an occupant and a headrest for supporting a head of the occupant, a support member provided inside the seat back, and the support member. A seat back frame that is rotatably supported by the vehicle and that rotates when the occupant's waist presses the seat back with a predetermined load due to a collision from the rear of the vehicle and pushes the headrest toward the occupant; and the support member or the seat back. A vehicle seat, comprising: a holding member provided on a frame, for holding the seat back frame at a position where the seat back frame is rotated.