JPH10278645A - Method for suppressing rebound of vehicle shock absorbing sheet and vehicle shock absorbing sheet - Google Patents

Abstract

(57) [Summary] [Purpose] Restricting the reaction force from a seat pad and an erected elastic support member to reduce damage to a seated person due to rebound movement. [Structure] An insert wire embedded in the seat pad 18 when the seat pad 18, S-spring, or the like 16 is elastically deformed by a predetermined amount or more due to the rearward movement of the occupant's upper body due to the input of an excessive impact at the time of a rear collision. Hold 44 approximately in its sinking position. Then, by holding the insert wire 44, S
The rear portions of the springs 16 and the seat pad 18 from the insert wire 44 are restrained in a substantially elastically deformed state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impact absorbing sheet for a vehicle which absorbs impact energy at the time of a rear collision and protects the occupant from the impact, and more particularly, to the occupant from rebounding motion after inputting an impact. The present invention relates to a method for suppressing rebound of a vehicle impact absorbing sheet to be protected and a vehicle impact absorbing sheet.

[0002]

2. Description of the Related Art In a vehicle seat for an automobile or the like, protection of a occupant in a collision from the rear of the automobile or the like, that is, at the time of a so-called rear collision, has been an issue of recent attention. Then, for example, a weak portion, a so-called weak portion, is provided in a part of the seat back frame, a part of the reclining device, or the like, and when an excessive impact energy such as a rear collision is input to the seat, the strength is reduced. A so-called shock absorbing sheet is provided as a vehicle seat for an automobile or the like, in which a seat back is forcibly tilted backward by buckling deformation or the like in a fragile portion, and a shock applied to a seated person is reduced by absorbing impact energy due to the backward tilt. Have been.

[0003] As such an impact absorbing sheet, for example, a configuration disclosed in Japanese Patent Application Laid-Open No. 07-132767 is known. In this known configuration, a meandering reinforcing rib portion is provided on a part of the bracket of the reclining device,
The rearward tilt of the seat back accompanied by buckling deformation at the reinforcing rib portion absorbs impact energy at the time of a rear collision.

[0004]

In the above-described shock absorbing seat, the rear body causes the upper body of the occupant to lose its seat back under the inertia force of the seat pad.
And, with the purpose of elastically supporting the seat pad, it moves rearward and greatly sinks with the elastic deformation of the erected elastic support member erected between the left and right side ends of the seat back frame, and Buckling deformation at the weakened portion is possible by receiving the load due to the backward movement to the seatback frame.

That is, at the time of a rear collision, the seat back frame leans backward in a state where the seat pad and the erected elastic support member store the restoring force from the elastic deformation as a reaction force. The force acts on the upper body of the seated person, and pushes the upper body of the seated person forward, so-called rebound exercise.

[0006] Since the upper body of the seated person is usually restrained by a seat belt, the movement of the upper body in front of the seat back is restricted. However, due to this, the upper body of the occupant, particularly the chest, is pressed against the seat belt by the rebound movement after the input of the impact, and further, the head exhibits a movement in which the head is sharply inclined forward with respect to the upper body. It will be easier.

That is, in the known shock absorbing sheet, the protection from the shock at the time of input is sufficient, but the protection of the occupant's chest, head and neck after the input of the shock may not be sufficient. There is.

According to the present invention, a shock absorber for a vehicle is provided which restricts a reaction force from a seat pad and an erected elastic support member so as to reduce damage to a occupant's chest, head and neck caused by rebounding motion. It is an object of the present invention to provide a method for suppressing rebound of a seat and an impact absorbing sheet for a vehicle.

[0009]

In order to achieve this object, according to the method for suppressing rebound of a vehicle impact absorbing sheet of the present invention, the upper body of a seated person accompanying an excessive impact input at the time of a rear-end collision is provided. When the seat pad and the erected elastic support member are elastically deformed by a predetermined amount or more due to the backward movement, the support member at the position aligned with at least the seating surface of the seat pad, which has sunk integrally under the elastic deformation, is erected. The elastic support member is held substantially in its sunk position under the locking of the protrusion from the support member behind the elastic support member. By holding the support member, the erected elastic support member and the rear portion of the seat pad from the support member are restrained in their substantially elastically deformed state.

[0010]

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

As shown in FIGS. 1A and 2, in a vehicle shock absorbing sheet 10 according to the present invention, a seat back is provided.
Inside the seat back frame 14, which forms the skeleton of 12,
An installation elastic support member 16 is installed and stretched, and a seat pad 18 for elastically supporting the upper body of the occupant is disposed on the front surface (left side in the figure) of the installation elastic support member.

The seat back frame 14 includes, for example, a pair of left and right side brackets 20 forming side edges thereof,
It has a combination with a substantially U-shaped pipe frame 22 integrally fixed to the upper portion of the side bracket, and is assembled by connecting the rear portions of the left and right side brackets with the upper and lower connecting members 24. An erecting elastic support member 16 made of an S spring or the like is installed and stretched between the rear portions of the left and right side brackets 20, and a seat pad 18 made of a urethane foam material or the like is provided on the front surface of the S spring or the like. The seat back 12 is arranged, and is entirely covered with a trim cover (not shown) made of a skin or the like, so that the upper body of the occupant, particularly the chest or waist, can be elastically supported from behind. .

As shown in FIG. 2, each end of the S spring or the like (bridged elastic support member) 16 has a locking piece 26 formed by, for example, partially cutting and raising the back surface of the side bracket 20. Is locked and held.

As shown in FIG. 2, the side bracket 20 of the seat back frame is provided with a fixing nut 28, for example.
Are formed integrally on the inner surface thereof. And
As can be seen from FIG. 1A in addition to FIG. 2, the seat back frame 14 is screwed into the fixing nut 28 so that the seat back frame 14 is rotated by the pivot arm of the reclining device 32.
34 are integrally connected.

As the reclining device 32, a known device can be used, and since the reclining device itself is not the purpose of the present invention, it will not be described in detail here. As this type of reclining device 32, for example,
One disclosed in JP-A-62-026008 can be exemplified.

As shown in FIGS. 1A and 2, in this embodiment, the strength weak portion 36 for urging the seat back frame 14 to lean backward when an impact is input at the time of a rear collision is provided. ,
A side surface of the side bracket 20 of the seat back frame is provided as, for example, a substantially triangular hole. The strength weak portion (opening) 36 is provided at a height corresponding to the flexible portion of the upper body of the seated person, that is, the lumbar vertebra.

As shown in FIG. 2, the seat back frame 14 is formed, for example, by integrally including a pair of left and right stay brackets 42 as a cylindrical body at the upper end of the pipe frame 22, and is provided for a seated person. A headrest (not shown) that supports the head can be mounted on the seatback frame, that is, the upper end of the seatback 12 via the stay bracket.

Here, in the shock absorbing sheet 10 of the present invention, the support member 44 which can be sunk by compressive deformation of the seat pad 18 under the action of the load from the upper body of the occupant is provided with the support member 44 of the seat pad. It is arranged at least at a position aligned with the seating surface 18a. As the support member 44, for example, an insert wire integrally embedded at a position aligned with the seating surface 18a of the seat pad shown in FIGS. 1A and 2 can be exemplified.

The insert wire (support member) 44
For example, it is formed as an approximately S-shaped meandering, substantially planar elastic body, and is disposed at two positions vertically separated from each other at a position aligned with the seating surface 18a of the seat pad.

The insert wire 44 integrally has, for example, a substantially U-shaped projecting portion 46 formed by partial bending. Then, as shown in FIGS. 1A and 1B, the projecting portion 46 projects from the back of the seat pad 18,
It is arranged in a state of extending behind the S spring 16 or the like.

As can be seen from FIG. 1B, the protrusion 46
Is formed integrally with, for example, a pair of left and right (up and down in the figure) hook pieces 48 formed by bending the opposite end inward. In this embodiment, the hook pieces 48 (48-1 and 48-2) are provided in the projecting direction of the projecting portion 46 due to the sinking of the insert wire 44, that is, at two places separated in the sinking direction of the insert wire. Are provided intermittently.

As shown in FIGS. 1 (A), 1 (B) and 2, the locking member 50 capable of locking the hook pieces 48 (48-1, 48-2) of the protruding portion is provided. Through the insertion into 46, for example, it is installed and fixed between the upper and lower connecting members 24 of the seat back frame 14. As the locking member 50, for example, a so-called V-shaped stay having a substantially V-shaped cross-section that can be engaged with the hook pieces 48 (48-1, 48-2) of the protruding portions can be used.

As can be seen from FIGS. 1 (A) and 1 (B), the hook pieces 48 (48-1, 48-2) and the V-shaped stay (locking member) 50 of the projecting portion are connected to the insert wire 44. The protrusion 46 can be guaranteed to move backward due to the sinking of the protrusion, and the protrusion after the hook piece is locked to the V-shaped stay, that is, the insert wire 44 can be held in a non-returnable shape. Be placed.

Here, the hook piece 48 (48-1, 48-2) of the projecting portion is used.
For example, due to the action of an excessive load from the front side of the seat pad 18, the S-spring 16 or the like and the insert wire 44 sinking due to the elastic deformation of the seat pad 18 are locked to the V-shaped stay 50. It is provided at a position where
In other words, the hook piece 48 (48-1, 48-2) of the projection and the V-shaped stay
Between 50 and 50, the elastic deformation of the seat pad 18 and the S spring 16 under the load from the occupant in the normal sitting posture, that is, the compressive deformation of the seat pad seating surface 18a and the deflection of the S spring and the like. A so-called play is provided, which makes it possible to ensure a suitable elastic support of the upper body of the occupant in a normal sitting position.

The projecting portion 46 of the insert wire and the V-shaped stay 50 are provided at positions separated from the left and right sides of the seat back 12, respectively.

In the shock absorbing seat 10 having such a structure, when a rear collision of the vehicle occurs, the load from the upper body of the occupant who has moved rearward due to the impact is compressed by the compression deformation of the seating surface 18a of the seat pad. 1A with the deflection of the S spring 16 and the like, and is received by the seat back frame 14 in the initial state shown in FIG. When the load exceeds the rigidity of the weakened portion 36 provided on the side bracket 20 of the seatback frame, the seatback frame 14 is deformed by buckling deformation at the weakened portion as shown in FIG. Leaning backwards,
By absorbing the impact energy due to the backward tilt, the occupant is protected from the impact at the time of the rear collision.

Here, in the present invention, since the insert wire 44 is embedded in the seat pad 18, if the seat pad seating surface 18a is compressed by an excessive load from the upper body of the occupant, FIG. As shown in (A), the insert wire 44 sinks along with this, and the protrusion 46 of the insert wire is pushed rearward with respect to the V-shaped stay 50. For example, as shown in FIG. 3 (B-1), when the hook piece 48 (48-1) of the protruding portion exceeds the V-shaped stay 50, each terminal of the V-shaped stay locks the left and right hook pieces. Under the
The protrusion 46 is held at the protrusion position.

Such a hook piece by the V-shaped stay 50
When the locking of 48 (48-1) occurs, the projecting portion 46 is held in its protruding state, and eventually the insert wire 44 is held in its sunk state, so that the S spring 16 etc. and the seat pad 18 from the insert wire are held. The rear portion is restrained substantially in its elastically deformed state under the holding of the insert wire.

As described above, according to the vehicle impact absorbing sheet rebound suppressing method of the present invention, the seat pads 18 and S springs 16 which are elastically deformed by the impact energy at the time of a rear collision cause the submersion 16 associated therewith to sink. By holding the insert wire 44 at the position, the insert wire 44 is restrained substantially in its elastically deformed state. As described above, if the seat pad 18 and the S-spring 16 are restrained in the elastically deformed state, the generation of the reaction force from these members due to the restoration from the elastic deformation is restricted, and the reaction force is generated by the action of the reaction force. Rebound movement of the seated person's upper body is reliably suppressed.

Therefore, the transmission of impact energy to the chest and the head caused by the rebound motion after the input of the impact at the time of the rear collision can be reliably suppressed, and the chest,
Due to the sufficient improvement of the protection effect of the head and neck, the damage to the occupant is further reduced.

Further, since the impact energy at the occupant's chest and waist is reliably absorbed under the backward inclination of the seat back frame 14 due to the buckling deformation of the weakened portion 36 due to the impact of the rear collision, The protective effect on the chest and waist when a shock is input during a rear collision is not impaired.

The impact absorbing sheet for a vehicle according to the present invention.
According to 10, the above-described rebound suppression method can be appropriately performed, and the protection ability for the chest, the head and the neck after the input of the shock added at the time of the input of the shock at the time of the rear collision can be improved, Damage is further reduced.

Here, as described above, in the embodiment of the present invention, the hook pieces 48 (48-1, 48-2) are provided at two places separated from each other in the sinking direction of the insert wire 44. . Then, as shown in FIG. 3 (B-1), in the embodiment described above, the hook piece 48-1 by the V-shaped stay 50 is used.
The locking state of the protrusion 46 and the insert wire 44
Are shown as the holding positions.

For example, the seat back 12 depends on various conditions such as the speed of the vehicle or the like at the time of a rear collision, the weight of the occupant, and the positional relationship between the seating surface of the seat pad and the upper body of the occupant.
The amount of the body of the occupant with respect to the sun is different. Therefore, when the hook piece 48 is provided only in one place,
It is also conceivable that the holding by the sinking of the insert wire 44 may not be properly obtained due to the difference in various conditions.

Therefore, as in the embodiment of the present invention,
If the hook pieces 48 (48-1 and 48-2) are intermittently provided at two places away from each other in the sinking direction of the insert wire 44, it can be easily held at a position corresponding to the sinking amount of the insert wire Becomes That is, if the hook piece 48 (48-1) is locked to the V-shaped stay 50 as shown in FIG. 3 (B-1) when the insertion wire 44 has a small sinking, the sinking becomes large. In such a case, the hook wire 48 (48-2) of the next stage is locked to the V-shaped stay as shown in FIG. 3 (B-2), so that the insert wire is securely held at the large sinking position.

Therefore, if a plurality of hook pieces 48 (48-1 and 48-2) are provided at positions spaced apart in the sinking direction of the insert wire 44, the insert wire 44 can be inserted by the input of a shock at the time of a rear collision.
It can properly cope with the variation of the sinking amount of 44, and the protection effect for the occupant can be maintained higher.

Here, the configuration in which the hook pieces 48 are provided at two locations is illustrated, but the present invention is not limited to this. For example, a configuration in which the hook pieces are provided at three or more locations may be employed.
However, considering the amount of compression of the seat pad 18 and the amount of deflection of the S spring 16 or the like, the hook piece 48
It is considered that about two places are preferable in order to surely obtain the lock.

Here, in the embodiment of the present invention, the protruding portion 46 is formed integrally as a part of the insert wire 44. However, the present invention is not limited to this. It is good also as a structure which is integrally connected by retrofitting. However, if the protruding portion 46 is provided integrally with the insert wire 44, the number of components and the number of operation steps are reduced, so that the configuration and the operation can be simplified easily.

Further, in this embodiment, the insert wire 44 is exemplified as a support member, but the support member is configured to compress the seat pad 18 under the action of a load from the upper body of the occupant. It is sufficient that the seat pad can be sunk down and the seat pad can be pressed in the direction of compression deformation.Therefore, it is not limited to the insert wire.For example, a wire of the same shape is arranged on the front surface of the seating surface 18a of the seat pad. Then, the support member may be used.

However, if the insert wire 44 is used as a support member, the seat pad for the upper body of the seated person
Because the support member does not impair the elastic support force from 18,
The arrangement of the support member does not cause a decrease in the comfort of the occupant.

Further, since the insert wire 44 is made of an approximately S-shaped meandering and substantially planar elastic body, the seat pad 18 can be pressed over a wide range. And the so-called pad breakage caused by holding the insert wire can be reliably prevented. Further, since the insert wire 44 has elasticity due to its meandering shape, the deformation following the elastic deformation of the seat pad 18 can be easily ensured, so that the occupant does not feel a feeling of bottoming, uncomfortable feeling, or the like.

In this embodiment, the meandering insert wire 44 that is continuous in a substantially S shape is embodied as a substantially planar elastic body. However, the present invention is not limited to this. May be embedded as a support member in the seat pad 18 instead of the insert wire.

In this embodiment, the weakened portion 36 is embodied as a substantially triangular hole.
Seat back frame under the input of impact at the time of rear collision
Needless to say, the weak-strength portion may have another shape as long as it can promote the backward tilting of 14.

Further, the V-shaped stay 50 is connected to the hook piece 48 of the projecting portion.
(48-1, 48-2) is embodied as a lockable locking member, but is not limited thereto, and a rod or the like integrally having a blade-shaped locking piece at a key point is used as the locking member. Alternatively, a configuration may be adopted in which the seat back frame 14 is installed and fixed between the upper and lower connecting members 24.

In the embodiment of the invention, a shock absorbing sheet to be attached to a car is exemplified. However, the present invention is not limited to this, though it is suitable for a car. The present invention may be applied to a sheet.

The embodiments of the present invention described above are intended to explain the present invention, and do not limit the present invention in any way. Modifications, alterations, and the like within the technical scope of the present invention may also be made. It goes without saying that all are included in the present invention.

[0047]

As described above, according to the vehicle impact absorbing sheet rebound suppressing method according to the present invention, a seat pad elastically deformed by impact energy at the time of a rear collision is provided.
The erected elastic support member is restrained substantially in its elastically deformed state by holding the support member at the sunk position accompanying the erected elastic support member. Therefore, the generation of the reaction force from these members due to the restoration from the elastic deformation is restricted, and the rebound movement of the upper body of the occupant due to the action of the reaction force is reliably suppressed.

Accordingly, the transmission of impact energy to the chest and the head caused by the rebound motion after the input of the impact at the time of the rear collision can be reliably suppressed, and the chest,
Due to the sufficient improvement of the protection effect of the head and neck, the damage to the occupant is further reduced.

According to the vehicle impact absorbing sheet of the present invention, the above-described rebound suppressing method can be appropriately performed, and the chest, the head, and the post-impact input added at the time of the input of the impact at the time of the rear collision. The increased ability to protect the neck further reduces occupant damage.

Further, if the insert wire is embedded in the seat pad as a meandering substantially planar elastic body continuous in a substantially S-shape, the seat pad can be pressed over a wide range. Appropriate restraint of the member can be obtained, and breakage of the pad due to holding of the insert wire can be reliably prevented. Furthermore, since the deformation following the elastic deformation of the seat pad can be easily secured in this insert wire, a feeling of bottoming out for the occupant,
There is no discomfort.

Further, if a plurality of hook pieces are provided at positions separated in the sinking direction of the support member, it is possible to appropriately cope with a variation in the sinking amount of the support member due to the input of an impact at the time of a rear collision. The protection effect for the person can be maintained higher.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a partially broken portion of a vehicle impact absorbing sheet according to the present invention in an initial state, and a schematic plan view of a protruding portion of an insert wire.

FIG. 2 is a schematic exploded perspective view of a partly broken portion of the vehicular shock absorbing sheet as viewed from the rear.

FIG. 3 is a schematic side view of a partly broken impact absorbing sheet for a vehicle when an impact due to a rear collision occurs, and an operation diagram of a projecting portion of an insert wire.

[Explanation of symbols]

 10 Shock absorbing sheet for vehicle 12 Seat back 14 Seat back frame 16 Elastic support member (S spring, etc.) 18 Seat pad 36 Strength weak part 44 Insert wire (support member) 46 Projection part 48 (48-1, 48-2) Hook piece 50 Locking member (V-shaped stay)

Claims (6)

[Claims] 1. The seat back frame is tilted rearward by buckling deformation at a strength weak portion at a side end thereof accompanied by elastic deformation of the seat pad and the erected elastic support member due to sinking of the upper body of the seated person. In a vehicle shock-absorbing seat that can protect the occupant from the impact of a rear-end collision by absorbing the impact energy due to the rearward tilt, the rearward movement of the occupant's upper body due to the input of an excessive impact at the time of a rear-end collision When the seat pad and the erected elastic support member are elastically deformed by a predetermined amount or more, the support member at a position aligned with at least the seating surface of the seat pad, which has sunk integrally under the elastic deformation, is erected. With the projecting portion from the support member behind the member being retained at substantially the sinking position, the erected elastic support member and the seat pad support member Square section substantially features and the rebound suppression method of the impact-absorbing sheet for a vehicle to be bound remain in that elastic deformation state. 2. The method according to claim 1, wherein the support member is a substantially planar elastic body integrally embedded at a position aligned with at least the seating surface of the seat pad. 3. A seat back having a structure in which a seat pad is arranged on a front surface of an installation elastic support member installed inside a seat back frame, and the seat back frame connected to a rotating arm of a reclining device, In a vehicle shock absorbing sheet which is tilted rearward by buckling deformation at a strength weak portion at a side end thereof by input of an impact at the time of a rear collision, a support member is disposed at a position aligned with at least a seating surface of the seat pad. A projection with a hook piece from the support member is provided so as to protrude from the back of the seat pad, and the support member under elastic deformation of at least one of the seat pad and the bridge elastic support member. This guarantees that the hook piece will move backwards due to the sinking of the hook, and that the hook piece will be locked when returning. A locking member for holding the projecting portion irreversibly is arranged and fixed behind the above-mentioned erection elastic support member at a predetermined distance from the erection elastic support member. A shock absorbing sheet for a vehicle, wherein when the elastic support member is elastically deformed by a predetermined amount or more, the support member can be held at the sunken position by holding the projection by locking the hook with the locking member. . 4. The impact absorbing sheet for a vehicle according to claim 3, wherein the support member is a substantially planar elastic body integrally embedded at a position aligned with at least the seating surface of the seat pad. 5. A support member is an insert wire formed in a meandering shape that is continuous in a substantially S shape and integrally embedded at a position aligned with at least a seating surface of a seat pad. By bending, the plane is roughly
A U-shaped protrusion is formed, and a pair of left and right hook pieces is provided on the protrusion by bending the inwardly facing end, and a cross-section substantially V that can engage each terminal with the hook piece is provided. Shape V
4. The fixed stay is disposed and fixed to the seat back frame as a locking member through insertion into the protruding portion.
The shock absorbing sheet for a vehicle according to the above. 6. The impact absorbing sheet for a vehicle according to claim 3, wherein the hook pieces of the protruding portion are provided intermittently at a plurality of locations separated in the sinking direction of the support member.