JP2000219069A - Automobile seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively prevent an occupant from suffering from whiplash by moving a head rest further frontward with the movement of the upper half body of the occupant during rear-end collision. SOLUTION: A head rest supporting frame 12 mounted with a head rest 10 is supported at its vertical middle portion so as to be rotationally movable a proper distance downwardly from the upper end of the side of a seat back frame 2 by a pivotally supporting bracket 5 and a pressure receiving portion 20 is provided for receiving a load applied from the front of a seat back is provided at the lower part of the head rest supporting frame 12. The head rest 10 is moved further frontward in response to the movement amount of the pressure receiving portion 20 with the backward movement of the upper half body of an occupant during rear-end collision.

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 behind is provided above a seat back of an automobile seat in order to prevent an occupant from whiplashing when the vehicle is hit by a rear collision. However, with a fixed headrest, the acceleration of the entire seat due to the impact of a rear-end collision and the inertia of the occupant cause the seatback to incline backward and the occupant's body to rise up diagonally and rearward. Shifts above the headrest and a large load acts on the neck,
It was difficult to reliably prevent the occupant from whiplashing.

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

In FIG. 7, when an impact is applied from the rear as shown by a white arrow due to a rear impact from a normal state as shown in FIG. 7A, as shown in FIG. The impact pressure receiving frame 32 disposed in front of the seat back frame 31 is bent by the lower rigidity portion 33 at the lower portion thereof and moved backward, and the headrest connected to the impact pressure receiving frame 32 with the backward movement. The support arm 34 is rotated around the upper side of the seat back frame 31 via the rotation support portion 35, and the headrest 36 provided at the upper end of the headrest support arm 34 is moved forward. In this way, the headrest 36 is moved forward by the rearward movement of the occupant's upper body at the time of a rear collision, and close to the occupant's head, thereby preventing whiplash.

As shown in FIG. 8, an upper portion of a headrest support frame 43 is supported by a bearing portion 42 provided at an upper end portion of a seatback frame 41 so as to be able to rotate back and forth and slide up and down. A headrest 44 is provided at an upper end of the headrest support frame 43, an impact pressure receiving part 45 is provided at a lower end of the headrest support frame 43, and the other end of a vertical swing lever 46 pivotally supported at one end to the seat back frame 41 is connected to a lower end of the headrest support frame 43. Later, there has been proposed a device provided with an urging means 47 for pivotally supporting the portion and for urging the intermediate portion of the up-and-down swing lever 46 to swing downward.

In this configuration, when the impact pressure receiving portion 45 is pressed rearward by the rearward movement of the occupant's upper body during a rear-end collision, the lower end of the headrest support frame 43 is connected to the vertical swing lever 46. As a result, the lower end of the headrest support frame 43 is pushed upward along with the rearward movement, and the headrest 44 moves diagonally forward and upward to approach the occupant's head, thereby preventing a whiplash obstacle.

Japanese Patent Application Laid-Open No. Hei 10-119919 discloses that the upper portion of a seat back frame is divided into a lower portion and a front end of the divided portion is pivotally supported back and forth. It discloses that a headrest is mounted on an upper part of a frame and connected to an impact means (pressure receiving part) disposed on a lower part.

[0008]

However, in the configuration as shown in FIG. 7, the amount of rearward movement of the impact pressure receiving frame 32 and the amount of forward movement of the headrest 36 are limited by the rotation support portion at the upper end of the seat back frame 31. Since the distance between the upper end of the headrest support arm 34 and the headrest 36 is not long, the distance between the upper end of the headrest support arm 34 and the headrest 36 is usually not long.
The movement amount of No. 6 is not so large, and there is a problem that the whiplash prevention effect is limited.

Also, in the configuration shown in FIG.
Since the bearing 42 is provided at the upper end of the seat back frame 41, there is a similar problem.

On the other hand, in the apparatus disclosed in Japanese Patent Laid-Open No. Hei 10-119819, it is possible to increase the amount of movement of the headrest by increasing the vertical length of the upper part of the divided seat back frame. However, this method is applicable only to an expensive seat having a large margin in the strength and rigidity of the seat back frame itself, and there is a problem that the cost is increased due to securing the strength of the seat back frame itself.

In order to solve the above problem, as shown in FIG. 9, the upper end of a rectangular frame-shaped support bracket 53 is fixed to a frame pipe 52 at the upper end of a seat back frame 51 in a cantilever manner. It is conceivable that an intermediate portion of a headrest support frame 55 in which a headrest 54 is mounted on an upper portion is pivotally supported by a pivot shaft 56 at lower positions on both sides of a bracket 53, and a pressure receiving portion 57 is provided at a lower end portion of the headrest support frame 55. However, the desired performance may not be ensured because the support bracket 53 is cantilevered.

[0012] In view of the above-mentioned conventional problems, the present invention can move the headrest more forward in accordance with the rearward movement of the occupant's upper body at the time of a rear-end collision, and secures a stable operation to prevent whiplash. It is an object of the present invention to provide an automobile seat that can be configured at a high cost and at a low cost.

[0013]

According to the present invention, there is provided an automobile seat in which a vertically intermediate portion of a headrest supporting frame on which a headrest is mounted is rotated back and forth to a position which is a suitable distance below an upper end of a side portion of a seatback frame. Pivot as much as possible,
The headrest support frame is provided with a pressure receiving part at the lower part that receives the load applied from the front of the seat back.The headrest is provided at the upper part, and the middle part of the headrest support frame provided with the pressure receiving part at the lower part is a side part of the seat back frame. The distance from the pivoting position to the headrest can be longer than the distance from the pivoting position to the pressure receiving part, and the amount of movement of the pressure receiving part due to the rearward movement of the occupant's upper body during a rear-end collision can be reduced. On the other hand, the headrest can be moved greatly forward, the forward movement of the headrest can be increased with a simple structure, the whiplash preventing effect can be reliably obtained, and the headrest is pivotally supported at the side of the seat back frame. Because it has sufficient rigidity to withstand impact and the pressure receiving part is located only behind the occupant's back,
The stability of operation is high and the desired performance can be secured.The seat back frame is integrated and the headrest support frame only needs to be pivotally supported on its side, so it has a lightweight and simple frame structure. The required rigidity can be secured, and the structure can be reduced in weight and cost.

Further, on the side of the seat back frame,
When a guide groove is provided along the rotation trajectory of the lower end of the headrest support frame, and an engaging member slidably engaged with the guide groove is attached to the lower end of the headrest support frame, the headrest support frame is provided at the lower end. Both sides of the pressure-receiving part are slidably engaged and supported by the sides of the seat back frame, so the strength is high. Even if it receives an impact, it does not deform irregularly, and the operation stability is further improved. Desired performance can be secured.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an automobile seat according to an embodiment of the present invention; FIG.

1 to 3, reference numeral 1 denotes a seat back of an automobile seat, and a seat cushion (not shown).
It is mounted so that it can recline. Reference numeral 2 denotes a seat back frame having a substantially inverted U-shape as viewed from the front, which forms a skeleton structure surrounding the left and right sides and the upper side of the seat back 1. 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 into a substantially U-shape that is opened downward. The lower end is integrally fixed to the upper end of the side frame plate 3.

A pivot bracket 5 having a substantially U-shaped cross section is provided at a position below the upper end of both sides of the upper pipe 4 by an appropriate distance, and both flange portions 5a are brought into contact with the outer surface of the upper pipe material 4. Is fixed by welding. As shown in FIG. 4, a bolt hole 5b is formed in the center of the pivot bracket 5, and a nut 6 is fixed to the back surface thereof.

A guide bracket 7 having a substantially U-shaped cross section is disposed at a position below the upper end of the side frame plate 3 by an appropriate distance, and its flange portion 7a is provided with a rising flange 3a in front of and behind the side frame plate 3.
And is fixed by welding. The guide bracket 7 is formed with an arc-shaped guide groove 8 centered on the axis of the bolt hole 5 b of the pivot bracket 5.

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

Reference numeral 12 denotes a headrest support frame for supporting the headrest 10, a pipe frame 13 formed by bending a pipe material into a substantially U-shape that is opened downward, and a connecting member 14 made of a pipe material connecting the lower ends thereof. The two sides of the pipe frame 13 are pressed flat except for the upper end to form a flat portion 13a.
The headrest support frame 12 is formed to have a width that almost fits inside the seatback frame 2,
The upper end of the pipe frame 13 is located immediately below the upper pipe 4, and the connecting member 14 faces the guide groove 8 of the guide bracket 7. At the upper part of the pipe frame 13, the lower ends of a pair of support tubular parts 15 capable of inserting and removing the stay 11 and fixing it at an arbitrary position are fixed by welding so that the headrest 10 can be supported in a height-adjustable manner. I have.

As shown in FIG. 4, a pivot shaft hole 1 is formed above the flat portions 13a on both sides of the headrest support frame 12.
The shaft portion 17a of the stepped bolt 17 is fitted, and the screw portion passes through the bolt hole 5b of the pivot bracket 5 and is screwed and fixed to the nut 6 on the back surface. 12 is supported by the seat back frame 2 so as to be swingable back and forth.

The lower end of the flat portion 13a of the pipe frame 13 is opposed to the guide groove 8 of the guide bracket 7, and the engaging shaft slidably engages the guide groove 8 from the lower end of the flat portion 13a. 18 are protruded. Engagement shaft 18
A ring groove 18a is formed at the front end of the guide bracket 7, and an E-ring 19 that engages with the back surface of the guide bracket 7 is mounted.

The connecting member 14 connecting the lower ends of the headrest support frames 12 has a central portion that is gently curved rearward so as to follow the curve of the occupant's back. The pressure receiving portion 20 receives a load acting on the front surface of the seat back 1 by inertia.

Although not shown, the lower end of the headrest support frame 12 and the seat back frame 2
A tension spring is interposed between the rising flanges 3a in front of the side frame plate 3 so that the lower portion of the headrest support frame 12 does not rotate backward unless a predetermined load or more acts on the pressure receiving portion 20. Is configured.

Although not shown in the drawing, the guide bracket 7 is locked so that the pressure receiving portion 20 is locked when the pressure receiving portion 20 is rotated backward, and the headrest 10 is held in a state of being moved forward. At the rear end of the guide groove 8, a locking claw and a ratchet mechanism for locking the engagement shaft 18 so as to be able to be released are provided.

In the above configuration, in a normal state before a rear collision, as shown in FIGS. 1 and 2, the lower portion of the headrest support frame 12 is urged forward by a tension spring (not shown). The headrest 10 is stationary in a state where the engagement shaft 18 is engaged with the front end of the guide groove 8.

Next, when the vehicle is back-collimated, the seat is impacted forward and the upper body of the occupant is moved rearward by the reaction, and a large load is applied to the front of the seat back 1 rearward. Acting, the pressure receiving portion 20 is strongly pressed rearward, and the lower portion of the headrest support frame 12 is rotated around the axis of the stepped bolt 17 in the pivot bracket 5 against the urging force of a tension spring (not shown). The headrest 10 at the top of the headrest support frame 12 moves forward by rotating backward. At this time, the headrest 10 moves the distance between the headrest 10 and the stepped bolt 17, the stepped bolt 17 and the pressure
Since the headrest 10 is moved forward by enlarging it by the ratio of the distance between the headrests 10, a large amount of forward movement of the headrest 10 can be ensured by disposing the pivot bracket 5 below, and the headrest of the occupant is moved by the headrest 10. The whip can be reliably received, and the occupant's neck can be protected to effectively prevent whiplash injury.

Further, since the headrest 10 is locked while moving forward, the occupant's upper body moves forward by the subsequent reaction, while the head remains by inertia, so that the head relatively swings backward. Even if it is, the head can be reliably received by the headrest 10 located forward, so that the occupant's neck can be protected and whiplash injury can be prevented.

Further, a guide groove 8 is provided in a side portion of the seat back frame 2 along a rotation locus of a lower end portion of the headrest support frame 12, and the headrest support frame 1 is provided with a guide groove 8.
Since the engaging shaft 18 that slidably engages along the guide groove 8 projects from the lower end of the seat back frame 2, both sides of the lower end of the headrest support frame 12 are at the side edges of the seat back frame 2. The headrest support frame 12 is slidably engaged and supported, and the headrest support frame 12 has high strength. Irregular deformation does not occur even when subjected to an impact, so that the operation stability is further improved and desired performance can be secured.

Further, since the headrest support frame 12 is pivotally supported by the pivot bracket 5 disposed on the side of the seat back frame 2, the headrest support frame 12 has sufficient rigidity to withstand an impact, and has the back of the occupant's back. Since only the pressure receiving unit 20 is located in the, the operation stability is high and desired performance can be secured. In addition, since the seat back frame 2 is integral and only needs to pivotally support the headrest support frame 12 with the pivot brackets 5 at the side portions, the required rigidity is secured with a lightweight and simple frame configuration. It can be made lightweight and inexpensive.

In the above embodiment, the connecting member 14 is formed of a pipe material. However, as shown in FIG. 6, the connecting member 14 may be formed of a member having a substantially U-shaped cross section.
In FIG. 6, reference numeral 22 denotes a tension spring that urges the lower portion of the headrest support frame 12 toward you.

[0032]

According to the vehicle seat of the present invention, as described above, the intermediate portion of the headrest support frame provided with the headrest at the upper portion and the pressure receiving portion at the lower portion is pivotally supported at the side of the seatback frame. Therefore, the distance from the pivot position to the headrest can be longer than the distance from the pivot position to the pressure receiving section, and the headrest is large compared to the amount of movement of the pressure receiving section due to the rearward movement of the occupant's upper body during a rear-end collision. It moves forward a distance, and with a simple structure, the amount of forward movement of the headrest can be increased and the effect of preventing whiplash can be reliably obtained, and since it is pivotally supported at the side edges of the seat back frame, it can withstand impact sufficiently Since it has rigidity and only the pressure receiving part is located on the back of the occupant's back,
The stability of operation is high and the desired performance can be secured.The seat back frame is integrated and the headrest support frame only needs to be pivotally supported on its side, so it has a lightweight and simple frame structure. The required rigidity can be secured, and the structure can be reduced in weight and cost.

Also, on the side of the seat back frame,
When a guide groove is provided along the rotation locus of the lower end of the headrest support frame, and an engaging member that slidably engages the guide groove is attached to the lower end of the headrest support frame, both sides of the lower end of the headrest support frame are provided. Is rotatably engaged and supported at the side of the seat back frame, so that it has high strength, does not cause irregular deformation even when subjected to impact, and further enhances operation stability to achieve desired performance. Can be secured.

[Brief description of the drawings]

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

FIG. 2 is a side view of the embodiment.

FIG. 3 is a partial front view of the same embodiment.

FIG. 4 is a detailed vertical sectional view of a portion A in FIG. 1;

FIG. 5 is a detailed vertical sectional view of a portion B in FIG. 1;

FIG. 6 is a perspective view of a main part of another embodiment of the present invention.

FIG. 7 is a side view showing an operation state of a conventional automobile seat.

FIG. 8 is a perspective view showing a schematic configuration of another conventional automobile seat.

FIG. 9 is a perspective view showing a schematic configuration of a vehicle seat prior to the present invention.

[Description of Signs] 2 Seat back frame 5 Pivot bracket 8 Guide groove 10 Headrest 12 Headrest support frame 17 Stepped bolt 18 Engagement shaft 20 Pressure receiving part

 ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yori Matsufuji 3-10-10 Fukuura, Kanazawa-ku, Yokohama-shi, Kanagawa Japan F-term (reference) 3B084 DB10 DB14 3B087 BD04 CD04 DC06 DC08

Claims (2)

[Claims] 1. A headrest supporting frame on which a headrest is mounted is pivotally supported so as to be able to rotate back and forth to a position below an upper end of a side portion of a seat back frame by an appropriate distance, and is provided at a lower portion of the headrest supporting frame. An automobile seat comprising a pressure receiving portion for receiving a load applied from a front surface of a seat back. 2. A guide groove is provided on a side of the seat back frame along a rotation locus of a lower end of the headrest support frame, and a guide groove is slidably engaged with the guide groove on the lower end of the headrest support frame. The automobile seat according to claim 1, wherein a joining member is attached.