JP3519644B2 - Car seat - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat having a headrest.

[0002]

2. Description of the Related Art A headrest for receiving the head of an occupant from the rear is provided above the seat back of an automobile seat in order to prevent a whiplash injury to the occupant when a vehicle is hit later. However, with a fixed headrest, due to the acceleration of the entire seat due to the impact at the time of a rear-end collision and the occupant's inertia, the seat back tilts backward and the occupant's body floats up and tilts backward. Shifts above the headrest and a large load acts on the neck,
It was difficult to reliably prevent the whiplash injury of the occupants.

In order to deal with such a problem, the applicant of the present invention has previously proposed a structure shown in FIG. 6 in Japanese Utility Model Laid-Open No. 7-1842.

In FIG. 6, when an impact is applied from the rear as shown in FIG. 6 (b) from the normal state as shown in FIG. 6 (a) to the rear as shown by the white arrow, the upper half of the occupant's upper body is rearward. The impact pressure receiving frame 32 disposed in front of the seat back frame 31 is bent at the lower rigidity portion 33 to move backward, and the headrest connected to the impact pressure receiving frame 32 in association with the backward movement. The support arm 34 is rotated around the upper side of the seatback frame 31 via the rotation support portion 35, and the headrest 36 provided on the upper end of the headrest support arm 34 is moved forward. In this way, in the case of a rear-end collision, the headrest 36 is moved forward by the rearward movement of the upper half of the occupant's body, and is approached to the occupant's head to prevent the whiplash injury.

However, in the structure as shown in FIG. 6, the impact pressure receiving frame 32 is disposed in front of the seatback frame 31 in addition to the headrest support arm 34, so that the frame structure of the seatback has a double structure. There was a problem that the weight became large.

Therefore, as disclosed in, for example, Japanese Patent Application Laid-Open Nos. 7-291005 and 10-181401, the upper and lower intermediate portions of the headrest support arm on which the headrest is mounted are moved forward and backward by a seatback frame. The seat back is rotatably supported, and a pressure receiving portion for receiving a load applied from the front surface of the seat back is provided under the headrest support arm, and the both ends of the pressure receiving portion are extensible when a load of a certain amount or more acts on the seat back. The one connected to the frame is proposed.

Further, as shown in FIG. 7, the headrest 4
The headrest support frame 42 having the headrest support frame 42 mounted thereon is vertically rotatably supported by a pivot bracket 44 at an appropriate distance below the upper end of the side portion of the seatback frame 41. Pressure receiving part 4 that receives the load applied from the front of the seat back to the lower part of the
5 is provided so that the headrest 43 moves largely forward with respect to the movement amount of the pressure receiving portion 45 due to the rearward movement of the upper half of the body of the occupant during a rear-end collision, and a portion corresponding to the lower portion of the headrest support frame 42 of the seatback frame 41 is provided. An arcuate guide groove 47 centered on the pivot axis of the headrest support frame 42 is provided in the provided guide bracket 46.
To guide the rotation of the lower portion of the headrest support frame 42 and regulate the rotation end to form the headrest 4
3 is prevented from moving excessively forward, and the lower portion of the headrest support frame 42 is urged forward by a tension spring 48, and the headrest support frame 42 is urged with a constant urging force.
Previously, there has been proposed a method in which the is positioned at the initial position.

[0008]

However, in the configurations as disclosed in the above publications, when the vehicle is collided at a high speed and a large acceleration acts rearward, the pressure receiving portion largely moves rearward and the headrest is moved. Moved too far forward,
There is a possibility that the occupant's head will not be properly supported because the occupant's head will be pressed more strongly forward from the state of being properly supported.
Further, in order to avoid this, JP-A-10-181401
As disclosed in Japanese Patent Publication No. JP-A-2003-264, there is a problem in that the cost is increased if a means with a complicated structure is added to prevent the headrest from moving when a load greater than a predetermined value is applied to the headrest from the head. .

Further, in the structure shown in FIG. 7,
When a very large acceleration acts toward the rear as described above, the chest of the occupant hits the pressure receiving portion 45 to move the pressure receiving portion 45 rearward, and the headrest 43 rotates forward to support the head. In that state, since the headrest support frame 42 is regulated at the rotation end and stops its rotation, there is no fear that the headrest 43 excessively moves and strongly presses the head, but the rotation of the headrest support frame 42. While the chest stops moving backward at the pressure receiving portion 45 due to the stop, the occupant's waist still tries to move backward, and an excessive load acts between the occupant's chest and waist.

In view of the above-mentioned conventional problems, the present invention can properly support the head with a simple structure even when a vehicle is rear-end collided at a high speed, and exerts an excessive load between the occupant's chest and waist. An object of the present invention is to provide an automobile seat that can prevent

[0011]

According to a vehicle seat of the present invention, a headrest support frame having a headrest mounted on an upper part is pivotally supported on a seatback frame so as to be rotatable forward and backward, and a seatback is mounted on a lower part of the headrest support frame. A pressure receiving portion for receiving a load applied from the front surface is provided, and stopper means for stopping further rotation of the headrest support frame in a state where the headrest is rotated forward by a predetermined distance is provided, and the pressure receiving portion is composed of a pressure receiving member. A shock absorbing portion that is deformed when an excessive load is applied to the connecting portion between the pressure receiving member and the headrest support frame when the headrest support frame is stopped by the stopper means and is applied when the load is applied when the headrest support frame is turned is provided. It is a thing.

With such a structure, when a rear-end collision occurs at a high speed and a large acceleration acts rearward, the chest of the occupant moves rearward to hit the pressure receiving portion, and the pressure receiving portion moves rearward. The headrest rotates forward, the head is properly supported by the headrest, and in that state, the rotation of the headrest support frame is stopped by the stopper means, so that the headrest moves excessively and strongly presses the head. There is no fear, and if a larger load is applied to the pressure receiving member due to the rotation stop of the headrest support frame, the shock absorbing portion between the pressure receiving member and the headrest support frame is deformed, and the pressure receiving member is kept rotating while the headrest support frame is stopped. Moves rearward, the rearward movement of the occupant's chest stops, while the lower back of the occupant still tries to move backward. Excessive load between parts and the waist can be prevented occurrence of a situation such as that act. Thus, even if a rear impact is made at a high speed, it is possible to properly support the head and to provide an excessive shock between the chest and waist of the occupant simply by providing a shock absorbing part that is deformed when an excessive load is applied. It is possible to prevent a large load from acting.

Further, if the pressure receiving member is made of a member having a substantially U-shaped vertical cross section having rigidity that is not substantially deformed while the headrest support frame is rotated, it is required to be lightweight and inexpensive by pressing a lightweight plate material. It is possible to obtain the pressure receiving member having the bending rigidity described above, the rearward movement of the occupant's chest is reliably and responsively transmitted to the rotation of the headrest support frame, and the occupant's head is appropriately supported by the headrest.

If the pressure receiving member is a strip-shaped pressure receiving plate,
When the back surface of the occupant's chest is pressed against the band-shaped pressure receiving plate, the shape of the outer surface of the occupant easily conforms to prevent the concentration of load.

Further, when the shock absorbing portion is constituted by the bent plate portion which is formed by bending the plate material so that the horizontal cross section has a wavy shape or a zigzag shape, the desired action can be stabilized by a simple press working of the plate material. Can be obtained.

Further, the shock absorbing portion wraps the plate member from the outer side to the inner side around the lower part of the frame member on both sides of the lower portion of the headrest support frame from the rear side to the front side, completely joins the outer side, and the inner side is more than a predetermined size. If they are joined by the strength of peeling under the effect of the load, the construction can be further simplified and the cost can be obtained.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of an automobile seat of the present invention will be described below with reference to FIGS.

In FIG. 1, reference numeral 1 denotes a seat back of an automobile seat, which is reclinably attached to a seat cushion (not shown). Reference numeral 2 is a seat back frame which has a skeleton structure that surrounds the left and right sides and the upper side of the seat back 1 and has a substantially inverted U-shape as a whole front shape. The seat back frame 2 includes side frame plates 3 on both sides made of a press-formed product of a plate material, and an upper pipe 4 formed by bending a pipe material downward into a substantially U-shape. The lower end is integrally fixed to the upper end of the side frame plate 3.

A pivot support bracket 5 having a substantially U-shaped cross section is provided at a proper distance below the upper ends of both sides of the upper pipe 4, and both flange portions 5a thereof are brought into contact with the outer surface of the upper pipe member 4. Are fixed by welding. As shown in FIG. 2, a bolt hole 5b is formed in the central portion of the pivot bracket 5, and a nut 6 is fixed to the back surface of the bolt hole 5b.

A guide bracket 7 having a substantially U-shaped cross section is provided at a position below a proper distance from the upper end of the side frame plate 3, and a flange portion 7a of the guide bracket 7 is provided on the front and rear sides of the side frame plate 3 to form a rising collar 3a.
It is fixed by welding by abutting on the outer surface of. The guide bracket 7 is formed with an arcuate guide groove 8 centered on the axis of the bolt hole 5b of the pivot bracket 5.

Reference numeral 10 denotes a headrest arranged on the upper portion of the seat back 1, and a pair of stays 11 extends downward from both sides of the lower portion thereof.

Reference numeral 12 is a headrest support frame for supporting the headrest 10. The headrest support frame 12 is composed of a pipe frame 13 which is formed by bending a pipe material downward and is formed into a substantially U shape. Both side portions of the pipe frame 13 are flat except the upper end portion. Then, the flat portion 13a is formed by pressing. The headrest support frame 12 is formed to have a width that substantially fits inside the seatback frame 2, and the upper end of the pipe frame 13 is located immediately below the upper pipe 4. Flat part 13
The lower end of a is located opposite the guide bracket 7,
Further, they are connected by a pressure receiving member 14 having a substantially U-shaped vertical cross section. The lower ends of a pair of support cylinders 15 capable of inserting and removing the stay 11 and fixing the stay 11 at an arbitrary position are fixed to the upper portion of the pipe frame 13 by welding so that the headrest 10 can be height-adjustably supported. There is.

As shown in FIG. 2, the pivot shaft hole 1 is provided on the flat portions 13a on both sides of the headrest support frame 12, as shown in FIG.
6 is formed, the shaft portion 17a of the stepped bolt 17 is fitted, and the screw portion penetrates the bolt hole 5b of the pivot bracket 5 and is screwed and fixed to the nut 6 on the back surface. A seat back frame 2 is swingably supported by a seat back frame 2.

The lower end of the flat portion 13a of the pipe frame 13 is located opposite to the guide groove 8 of the guide bracket 7, and is slidable into the guide groove 8 from the lower end of the flat portion 13a as shown in FIG. An engaging shaft 18 that engages with is projected. A ring groove 18a is formed at the tip of the engaging shaft 18, and the E-ring 1 engages with the back surface of the guide bracket 7.
9 is attached.

The pressure receiving member 14 connecting the lower ends of the headrest support frame 12 constitutes a pressure receiving portion 20 which receives a load acting on the front surface of the seat back 1 due to the inertia of the occupant's chest at the time of a rear collision. At the connecting portion of the pressure receiving member 14 with the headrest support frame 12, an excessive load is applied to the rear side in a state where the headrest support frame 12 is engaged with the rear end of the guide groove 8 and the engaging shaft 18 is stopped to rotate. A shock absorbing portion 21 that is deformed when acted on is provided. In the illustrated example, the shock absorbing portion 21 is composed of a bent plate portion 22 formed by bending a plate material so that the horizontal cross section has a wavy or zigzag shape.

A tension spring 23 is interposed between the lower end portion of the headrest support frame 12 and the front rising collar 3a of the side frame plate 3 of the seatback frame 2, and the pressure receiving portion 2 is provided.
The lower part of the headrest support frame 12 does not rotate rearward unless a certain load is applied to 0.

Although not shown, the pressure receiving portion 20
The rear end of the guide groove 8 of the guide bracket 7 has the engagement shaft 1 so that the headrest 10 is locked in that state when it is rotated rearward, and the headrest 10 is held in the state of being moved forward.
A locking claw and a ratchet mechanism for locking 8 for release operation are provided.

In the above-described structure, in the normal state before the rear collision, the lower portion of the headrest support frame 12 is biased forward by the tension spring 23 as shown in the figure, and the engagement shaft 18 is moved to the front end of the guide groove 8. The headrest 10 is stationary in the engaged position or in a state where the support tubular portion 15 is engaged with the upper pipe 4.

Next, when the vehicle is hit rearward, the seat is impacted and pushed forward, and the reaction causes the upper half of the occupant's upper body to move backward, causing a large rearward load on the front of the seat back 1. The pressure receiving portion 20 is strongly pressed rearward, and the lower portion of the headrest support frame 12 resists the biasing force of the tension spring 23 and rotates rearward around the axis of the stepped bolt 17 in the pivot bracket 5. The headrest 10 on the top of the headrest support frame 12 moves forward. At this time, the headrest 10 expands forward by an amount corresponding to the ratio of the distance between the headrest 10 and the stepped bolt 17 and the distance between the stepped bolt 17 and the pressure receiving section 20 with respect to the rearward movement amount of the pressure receiving section 20. To move, the headrest 10 is provided by placing the pivot bracket 5 below.
A large amount of forward movement can be secured, the head of the occupant can be reliably received by the headrest 10, the neck of the occupant can be protected, and whiplash injury can be effectively prevented.

Further, the engaging shaft 18 engages with the rear end of the guide groove 8 while the headrest 10 moves to a predetermined front position and the headrest is properly supported by the headrest 10, and the headrest supporting frame 12 Rotation stops. Here, the engagement shaft 18 and the rear end of the guide groove 8 function as stopper means. Thus the headrest support frame 1
By stopping the rotation of 2 by the stopper means at the predetermined rotation position, the headrest 10 moves forward from the predetermined head support position even when a rear collision occurs at a high speed and a very large acceleration acts. This prevents the headrest 10 from excessively moving forward and pressing the head strongly.

Further, when the rear-end collision occurs at a high speed and the acceleration is very large, and a larger load is applied to the pressure receiving member 14 by the rotation stop of the headrest supporting frame 12, the pressure receiving member 14 and the headrest supporting frame 12 are separated from each other. The bent plate portion 22 of the head is deformed, and the headrest support frame 1
Since the pressure receiving member 14 can move rearward while the rotation of the occupant 2 is stopped, the rearward movement of the occupant's chest is stopped, while the occupant's waist is prevented from moving rearward, and the occupant's chest and waist are prevented from moving. It is possible to prevent an excessive load from acting on.

Thus, even when a rear collision is made at a high speed, the headrest 10 can properly support the head, and the impact absorbing portion 21 composed of the bent plate portion 22 that deforms when an excessive load acts. It is possible to prevent an excessive load from acting between the chest and the waist of the occupant.

Further, since the headrest 10 is locked in the state of being moved forward, the subsequent reaction causes the upper half of the occupant's upper body to move forward, while the head remains in inertia, so that the head relatively swings backward. Even if the headrest 10 is caught, the headrest 10 is surely received by the headrest 10 positioned in front, so that the occupant's neck can be protected and the whiplash injury can be prevented.

Further, a guide groove 8 provided along the side edge of the seatback frame 2 along the rotation locus of the lower end of the headrest support frame 12 and an engagement shaft 18 protruding from the headrest support frame 12 slide on each other. Since the headrest support frame 12 is movably engaged and both sides of the lower end portion of the headrest support frame 12 are slidably engaged and supported by the side portions of the seatback frame 2, the strength of the headrest support frame 12 is high,
Irregular deformation does not occur even when a shock is received, and the stability of operation is further enhanced, and desired performance can be secured.

Further, since the headrest support frame 12 is pivotally supported by the pivot bracket 5 arranged on the side portion of the seatback frame 2, the headrest support frame 12 has rigidity enough to withstand impact and the back of the occupant's back. Since only the pressure receiving portion 20 is located in the vertical section, the stability of operation is high and desired performance can be secured, and the pressure receiving portion 20 has a rigidity that does not substantially deform during rotation of the headrest support frame. Since the pressure receiving member 14 has a substantially U-shape, a pressure receiving portion 20 having a required bending rigidity can be obtained at a low cost by press working of a lightweight plate material, and the headrest of the occupant's chest can be reliably moved backward and with good response. This is transmitted to the rotation of the support frame 12, and the headrest 10 can appropriately support the occupant's head.

Next, another embodiment of the vehicle seat of the present invention will be described with reference to FIGS. In addition,
Description of the same components as those of the above-described embodiment will be omitted, and only the main points of difference will be described.

In the above-described embodiment, the pressure receiving portion 20 is composed of the pressure receiving member 14 having a substantially U-shaped cross section, and the impact absorbing portion 21 is provided at both ends thereof. However, in the present embodiment, as shown in FIG. 4, the pressure receiving portion 20 is constituted by the band-shaped pressure receiving plates 24 made of a band-shaped plate material, and both ends thereof and the pipe frames 13 on both lower sides of the headrest support frame 12 are formed. As shown in FIG. 5 (a), the impact absorbing portion 21 of the connecting portion is wound by winding both end portions of the strip-shaped pressure receiving plate 24 around the lower end portion of the pipe frame 13 from the outer side to the inner side from the rear side to the front side. The outer end 25a is completely joined by fillet welding or the like, and the inner end 25b is an appropriate spot weld.
It is constructed by joining with a strength such that it is peeled off by the action of a load larger than a predetermined value by riveting, pinning, bonding or the like.

In the above structure, since the pressure receiving portion 20 is constituted by the strip-shaped pressure receiving plate 24, when the back surface of the occupant's chest is pressed against the pressure receiving plate 24, the outer surface shape of the occupant easily conforms to the load concentration. Can be prevented. Also in the structure of the shock absorbing portion 21, when a load larger than a predetermined value is applied to the pressure receiving plate 24, as shown in FIG. 5B, the inside of the winding plate portion 25 forming the shock absorbing portion 21. Edge 25
The pressure receiving plate 24 moves rearward due to the peeling of the joint b, and the same action and effect as the shock absorbing portion 21 of the above-described embodiment can be obtained, and the configuration is simple and inexpensive. .

[0039]

According to the vehicle seat of the present invention, when the vehicle is collided at a high speed and a large acceleration acts rearward as described above, the chest of the occupant moves backward and the pressure receiving portion is By moving backward, the headrest pivots forward, the head is properly supported by the headrest, and in that state, the headrest support frame is stopped by the stopper means. If there is no danger of pressing the headrest support frame further, and if a larger load acts on the pressure receiving member due to excessive acceleration after the headrest support frame stops rotating, the shock absorbing portion between the pressure receiving member and the headrest support frame will deform and the headrest support frame will be deformed. Since the pressure receiving member moves rearward with the rotation stopped, it is possible to prevent an excessive load from acting between the chest and the waist of the occupant. Therefore, even if the vehicle is hit rearward at high speed, the head can be properly supported, and the shock absorber with a simple structure that deforms when an excessive load is applied is excessive between the occupant's chest and waist. It is possible to prevent a large load from acting.

Further, when the pressure receiving member is made of a member having a substantially U-shaped vertical cross section having rigidity that is not substantially deformed while the headrest support frame is rotated, the light-weight plate material can be made light and inexpensive by pressing. A pressure receiving member having a required bending rigidity can be obtained, the rearward movement of the occupant's chest can be reliably and responsively transmitted to the rotation of the headrest support frame, and the occupant's head can be appropriately supported by the headrest.

If the pressure receiving member is a strip-shaped pressure receiving plate,
When the back surface of the occupant's chest is pressed against the band-shaped pressure receiving plate, the shape of the outer surface of the occupant easily conforms to prevent the concentration of load.

Further, when the shock absorbing portion is constructed by bending the plate material so that the horizontal cross section becomes wavy or zigzag, the desired action can be stably obtained by simple pressing of the plate material.

Further, the impact absorbing portion is wound around the lower portions of the frame members on both sides of the lower portion of the headrest support frame from the outer side to the inner side with the plate material wound from the rear side to the front side, and the outer side is completely joined, and the inner side is more than a predetermined size. If they are joined by the strength of peeling under the effect of the load, the construction can be further simplified and the cost can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of an embodiment of an automobile seat of the present invention.

FIG. 2 is a detailed vertical sectional view of a portion A of FIG.

FIG. 3 is a detailed vertical sectional view of a B part in FIG.

FIG. 4 is a perspective view of a main part of another embodiment of the present invention.

FIG. 5 is an operation explanatory view of the same embodiment.

FIG. 6 is a side view showing an operating state of a conventional vehicle seat.

FIG. 7 is a perspective view showing a schematic configuration of a vehicle seat prior to the present invention.

[Explanation of symbols]

2 seat back frame 8 guide groove (stopper means) 10 headrest 12 Headrest support frame 14 Pressure receiving member 18 Engaging shaft (stopper means) 20 Pressure receiving part 21 Shock absorber 22 Bending plate 24 strip pressure plate 25 winding plate part

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP 10-181401 (JP, A) JP 10-291434 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B60N 2/42 A47C 7/38 A47C 7/40

Claims (5)

(57) [Claims] 1. A headrest support frame having a headrest mounted on an upper part thereof is pivotally supported on a seatback frame so as to be rotatable forward and backward, and a pressure receiving portion for receiving a load applied from a front surface of the seatback is provided on a lower part of the headrest support frame.
Provided is stopper means for stopping further rotation of the headrest support frame in a state where the headrest is rotated forward by a predetermined distance, and the pressure receiving portion is constituted by a pressure receiving member, and at the connecting portion between the pressure receiving member and the headrest support frame, A vehicle seat, comprising: a shock absorbing portion that is deformed when an excessive load is applied to the headrest support frame in a state where the headrest support frame is stopped rotating by the stopper means as compared with a load applied when the headrest support frame is rotated. 2. The pressure receiving member is formed by a member having a substantially U-shaped vertical cross section, which has rigidity and is not substantially deformed during rotation of the headrest support frame.
The car seat described. 3. The vehicle seat according to claim 1, wherein the pressure receiving member comprises a strip-shaped pressure receiving plate. 4. The shock absorbing portion is composed of a bent plate portion obtained by bending a plate material so that a horizontal cross section has a wavy or zigzag shape. Automotive seat. 5. The shock absorbing portion is such that a plate member is wound from the outer side to the inner side around the lower portion of the frame member on both sides of the lower portion of the headrest support frame from the rear side to the front side, the outer side is completely joined, and the inner side is a predetermined amount or more. 2. The structure is such that they are bonded with a strength such that they are peeled off by the action of the load.
The vehicle seat according to any one of 1 to 3.