JP2002240682A - Seat belt device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the safety of an occupant by reducing the occurrence of slack generated between an anchor and the occupant and by sufficiently exerting the function of a pretensioner. SOLUTION: A motor 11 is installed in a pillar, and the other end of a ball screw 12 connected to it is supported by a support part 13. The root part of a shoulder anchor 8 is a ball screw nut, and the rotation of the motor 11 changes its position along the ball screw 12. Accordingly, the height of the shoulder anchor 8 can be changed by the rotation of the motor 11. A buckle 9 and an outer anchor 10 can horizontally be moved by the rotation of a motor 16. By detecting the physical constitution of the occupant with a sensor, the shoulder anchor 8, the buckle 9 and the outer anchor 10 are moved to positions for a seat belt 7 to tightly fit to the occupant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat belt device for restraining an occupant to a seat.

[0002]

2. Description of the Related Art A conventional seat belt mounted on an automobile restrains an occupant in an emergency by using a fixed point on the vehicle. The seat belt is usually supported at three points when the occupant is restrained by the seat. That is, a shoulder anchor, a buckle anchor, and an outer anchor. The shoulder anchor is installed on the occupant's shoulder,
The seatbelt is drawn out through a hole provided in the seatbelt.

[0003] Then, through a hole provided in the tongue,
Finally, the end is fixed by an outer anchor. The buckle anchor is installed on the opposite side of the seat from the outer anchor, and holds and fixes the buckle.
The occupant puts on the seat belt by pulling out the seat belt and engaging the tongue with the buckle.

[0004] Such a shoulder anchor, outer anchor,
Among the buckle anchors, the positions of the outer anchor and the buckle anchor are fixed. The position of the shoulder anchor is fixed in most cases, but there are also ones that can change the position manually or electrically (motor) according to the occupant's physique.

[0005]

However, in the conventional seat belt device, two of the three anchor positions are fixed, and the other one can be adjusted manually or electrically (motor). Therefore, when a small sized person is on board, the slack (slack) of the seat belt between these anchors and the occupant is less than that of a normal person on board. There was a problem that it became large.

The present invention has been made in view of such circumstances, and reduces the occurrence of slack generated between these anchors and the occupant, and fully exerts the function of the seat belt. The task is to increase safety.

[0007]

A first means for solving the above problems is a seat belt device for restraining an occupant to a seat, comprising: a position of a shoulder anchor; a position of a buckle anchor (inner anchor); A seat belt device according to claim 1, wherein at least one of the positions of the outer anchor is automatically detected in accordance with the physique of the occupant.

[0008] In this means, according to the physique of the occupant,
At least one of the position of the shoulder anchor, the position of the buckle anchor, and the position of the outer anchor is adjusted. Therefore, these automatically adjusted anchors are always located near the occupant, and the slack generated between the occupant and the anchor is reduced. Therefore, in an emergency, the seat belt can reliably restrain the occupant to the seat.

[0009] A second means for solving the above-mentioned problems is as follows.
The first means, wherein the occupant physique sensor provided on at least one of the seat and the seat back of the seat, and at least one of a shoulder anchor position adjusting device, a buckle anchor position adjusting device, and an outer anchor position adjusting device. And an occupant physique sensor provided on at least one of the seat and the seat back of the seat (claim 2).

In this means, the occupant physique (height from waist to shoulder, knee width, etc.) is detected by an occupant physique sensor provided on at least one of the seat and the seat back of the seat. Then, according to the detected value, at least one of the shoulder anchor position adjusting device, the buckle anchor position adjusting device, and the outer anchor position adjusting device was operated, and at least one of the anchors was determined according to the physique of the occupant. ,
Move to a position close to the crew. Therefore, slack generated between the occupant and the anchor is reduced, and the occupant can be reliably restrained by the seat.

A third means for solving the above-mentioned problem is as follows.
The first means, wherein an occupant physique sensor provided on at least one of a seat and a seat back of a seat, and at least one of a shoulder anchor position adjusting device, a buckle anchor position adjusting device, and an outer anchor position adjusting device. And an occupant physique judging circuit for judging the physique of the occupant by analyzing the information of the occupant monitoring device (claim 3).

In this means, the occupant physique determining circuit comprises:
The only difference is that the occupant's physique is determined by analyzing the information of the occupant monitoring device (such as an occupant monitoring camera). Therefore, the same operation and effect as those of the second means are produced.

A fourth means for solving the above-mentioned problem is as follows.
Any one of the first to third means, wherein a shoulder anchor position adjusting device, a buckle anchor position adjusting device,
At least one of the outer anchor position adjusting devices is
The position is adjusted by being driven by a motor (claim 4).

In this means, since the position control is performed by the motor, any one of the first to third means can be achieved by a simple mechanism.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 and FIG. 2 are diagrams showing an outline of a seat belt winding system according to an embodiment of the present invention. A seat mainly composed of a seat cushion 1 and a seat back 2 is attached to a seat side frame 3 and fixed to a vehicle body by a support column 4 via a seat rail (not shown) or the like.

A seat belt retractor 6 is mounted in a pillar 5 of the vehicle body, and a seat belt 7 extending from the seat belt retractor 6 is inserted into a shoulder anchor 8 through an opening 5a of the pillar 5, and a tongue (not shown) is provided. Are engaged with the buckle 9, and the tip is fixed to the outer anchor 10. When the occupant does not wear the seat belt, the tongue and the buckle 9 are disengaged, and the seat belt retractor 6 causes the loosened seat belt 7 to be rolled into the seat belt retractor 6.

In this embodiment, a motor 11 is provided in a pillar, and the other end of a ball screw 12 connected to the motor 11 is supported by a support 13. The root of the shoulder anchor 8 is a ball screw nut. When the motor 11 rotates, the position changes along the ball screw 12 according to the rotation. Therefore, the height of the shoulder anchor 8 can be changed by the rotation of the motor 11.

The buckle 9 and the outer anchor 10
Is supported by a guide shaft 14 bridged between the seat side frames 3 and a ball screw 15. That is, as shown in FIG. 2, a guide shaft 14 is bridged between the seat side frames 3 on both sides, and a ball screw 15 is supported by a bearing (not shown). The ball screw 15 is rotated by a motor 16. The motor 16 is
Although attached to the vehicle body, the attachment structure is not shown.

The guide shaft 14 passes through a hole of the guide portion 17, and the guide portion 17 slides along the guide shaft 14. The ball screw nut 18 is screwed with the ball screw 15 so that when the motor 16 rotates, the buckle 9 and the outer anchor 10 move in opposite directions. The buckle 9 and the outer anchor 10 are indicated by a bracket 19. In this example,
Although the buckle 9 and the outer anchor 10 are simultaneously moved by one motor 16, they may be separately driven by different motors. The buckle 9 and the outer anchor 10 are supported by a bracket 19 in FIG.
As shown in FIG. 1, the bracket 19 can move to the left and right through a gap between the seat cushion 1 and the seat back 2.

FIG. 3 is a diagram showing an example of an occupant physique sensor embedded in a seat. An occupant width sensor 20 is embedded in the seat cushion 1, and an occupant height sensor 21 is embedded in the seat back 2. Each of these sensors is of a capacitance type in which an elastic insulator is sandwiched between two electrodes, and when an occupant gets on the board, the sensor corresponding to the physique reacts. Therefore, the width and height of the occupant can be detected by detecting the capacitance pattern of each electrode.

Alternatively, the occupant may be photographed by a television camera provided in front of the passenger compartment, and the width and height of the occupant may be detected by image processing.

A control device (not shown) drives the motor 11 and the motor 16 shown in FIG. 1 in accordance with the width and height of the occupant detected by these sensors to change the position of the shoulder anchor 8 and The positions of the buckle 9 and the outer anchor 10 are changed. Therefore, the seat belt 7 is fitted according to the occupant's body, and slack does not occur.

In the above embodiment, all the positions of the shoulder anchor, the outer anchor and the buckle are automatically adjusted. However, even if only one of them is adjusted, a certain effect can be expected. it can.

[0024]

As described above, according to the present invention,
Shoulder anchor and buckle position according to the occupant's physique,
Since at least one of the positions of the outer anchor is adjusted, the slack of the seat belt can be reduced,
The function of the seat belt retractor can be sufficiently exhibited.

[Brief description of the drawings]

FIG. 1 is a diagram showing an outline of a seat belt winding system according to an example of an embodiment of the present invention.

FIG. 2 is a diagram showing an outline of a seat belt winding system according to an example of an embodiment of the present invention.

FIG. 3 is a diagram showing an example of an occupant physique sensor.

[Description of Signs] 1 ... seat cushion, 2 ... seat back, 3 ... seat frame, 4 ... post, 5 ... pillar, 5a ... opening, 6 ...
Seat belt retractor, 7: seat belt, 8: shoulder anchor, 9: buckle, 10: outer anchor,
11 ... motor, 12 ... ball screw, 13 ... support, 14 ... guide shaft, 15 ... ball screw, 16 ...
Motor, 17: guide portion, 18: ball screw nut, 19: bracket, 20: occupant width sensor, 21 ...
Occupant height sensor

Claims (4)

[Claims] 1. A seat belt device for restraining an occupant to a seat, wherein at least one of a position of a shoulder anchor, a position of a buckle anchor (inner anchor), and a position of an outer anchor is automatically adjusted according to the physique of the occupant. A seat belt device characterized in that the seat belt device is adapted to be dynamically adjusted. 2. The seat belt device according to claim 1, wherein an occupant physique sensor provided on at least one of a seat and a seat back of the seat, a shoulder anchor position adjusting device, a buckle anchor position adjusting device, and an outer. A seat belt device comprising: at least one of the anchor position adjusting devices; and an occupant physique sensor provided on at least one of a seat and a seat back of a seat. 3. The seat belt device according to claim 1, wherein an occupant physique sensor provided on at least one of the seat and the seat back of the seat, a shoulder anchor position adjusting device, a buckle anchor position adjusting device, and an outer. A seat belt device comprising: at least one of an anchor position adjusting device; and an occupant physique judging circuit for judging an occupant physique by analyzing information from an occupant monitoring device. 4. One of claims 1 to 3
Item, wherein at least one of a shoulder anchor position adjusting device, a buckle anchor position adjusting device, and an outer anchor position adjusting device is driven by a motor to perform position adjustment. Characteristic seat belt device.