JP2000025546A - Seat belt device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat belt device capable of compatibly realizing the regular seat belt function and the inflation type impact absorbing function in a high level without complicated manufacturing processes. SOLUTION: A bag body 10 inflated with a high-pressure gas which is provided on a seat belt device to protect a crew from an impact during a vehicle collision is separate from a webbing stretched at least from a shoulder part to a waist part, and arranged parallel to the webbing, and only both ends in its longitudinal direction are connected to the webbing. The crew restricting function in a normal condition and the impact mitigating function during a collision can be sustained by members which are independent from each other, and since the bag body is connected to the webbing only at both ends in the longitudinal direction, and parts abutted on a chest of the crew are free from each other, and the rapid inflation of the bag body can not be impeded without damaging the fitting feeling.

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 having a bag which is inflated by high-pressure gas to protect an occupant from an impact such as a vehicle collision.

[0002]

2. Description of the Related Art In order to prevent an occupant who has moved forward due to a deceleration generated at the time of a collision from hitting a structure or the like in a vehicle cabin, a width called a webbing is high in tensile strength of about 50 mm. BACKGROUND OF THE INVENTION Vehicles are provided with seat belts made of woven fabric (poor stretchability). If this seat belt is not properly attached to the occupant's body, for example, if it is loose, it may not be able to sufficiently restrain the occupant's movement at the time of a vehicle collision, and rather high surface pressure may be applied to the occupant. Was.

In order to cope with such inconvenience, the seat belt itself is formed in a bag shape, and the bag portion is normally folded to have a band shape similar to a general webbing, and is connected to the bag portion in the event of an impact. An air belt device has been proposed in which a bag-like portion is inflated by gas ejected from a gas generating device to improve occupant restraint performance and reduce impact force applied to the occupant (US Patent Nos. 3,8).
65,398).

According to such an air belt device, a large load caused by deceleration to the occupant can be dispersed over a wide area, so that the occupant's burden can be reduced as compared with the conventional belt-shaped webbing. it can. In addition, since the air belt device also has a function as an air bag device, if the air belt device is employed for a seat belt for a rear seat of an automobile, the air belt device having a complicated structure is installed at a lower cost than installing it in a front seat. The impact load received by the occupant of the rear seat at the time of a collision can be reduced without limiting the reclining function of the front seat and the like.

[0005]

However, in the above-described air belt device, since the seat belt itself is formed of a bag, the air belt device can be used as a normal seat belt (non-stretching in the longitudinal direction, tensile strength). It is extremely difficult to instantaneously expand at the time of a collision without impairing the wearing feeling.

[0006] A structure has also been proposed in which a webbing is sewn to a folded bag to ensure the normal usability of the seat belt (Japanese Patent Publication No. 63-3946).
When the webbing is sewn to the bag body, the webbing having poor stretchability impedes rapid expansion of the bag body, so that the impact absorption characteristics at the time of collision are necessarily reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and its main purpose is to provide a normal seat belt function and an inflatable shock absorbing function without complicating the manufacturing process. It is an object of the present invention to provide a seat belt device that can achieve both higher dimensions.

[0008]

In order to achieve the above object, according to the present invention, there is provided a bag belt in a seat belt device having a bag which is inflated by high pressure gas to protect an occupant from an impact such as a vehicle collision. A separate from the webbing that is extended from at least the shoulder to the waist of the occupant, and is provided side by side with the webbing,
Only both ends in the longitudinal direction were bound to the webbing. According to this, the occupant restraining function during normal operation and the impact mitigation function during collision can be assigned to different members, and only the longitudinal ends of the bag and the webbing are connected to each other. As a result, the part that touches the occupant's chest is free from each other, and does not impair the feeling of wearing and does not obstruct the rapid inflation of the bag.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described below in detail with reference to specific embodiments shown in the accompanying drawings.

FIG. 1 shows the overall structure of an air belt device for a front occupant of an automobile to which the present invention is applied. In FIG.
The seat belt is pulled out obliquely forward from a retractor device 2 fixed to a lower portion of the center pillar 1 in the passenger compartment, and a lap belt portion 3 wrapped around the upper leg of the occupant P seated on the seat S; A tongue plate 5 which is provided between the lap belt portion 3 and the shoulder belt portion 4;
Is connected to the buckle 6 provided on the side of the seat S opposite to the retractor 2, the lap belt portion 3 restrains the waist of the occupant P, and the chest from the shoulder to the shoulder belt portion 4.
Is to be restrained.

An inflator 8 is provided on the shoulder anchor 7 side of the shoulder belt 4 which is connected to the center pillar 1.
(Gas generator) is incorporated. Note that the inflator 8 can apply the technology disclosed in, for example, Japanese Patent Application Laid-Open No. 4-146843, and a detailed description thereof will be omitted.

As shown in FIGS. 2 to 4, the shoulder belt portion 4 includes a webbing 9 having a band shape with a width dimension of about 50 mm, a bag body 10 folded to the same width as the webbing 9, a webbing 9 and a webbing 9. Cover 11 covering bag 10
It is composed of And bag body 10 and webbing 9
Means that only both ends in the longitudinal direction are tied to each other by suturing or the like (reference numeral 13 in FIG. 5 indicates a sewn portion). In addition, bag 10
The relationship between the webbing 9 and the webbing 9 is as follows: the webbing 9 is arranged along the occupant side (FIGS. 2 and 3), the webbing 9 is arranged along the anti-occupant side (FIG. 4), and the webbing 9 is wrapped inside the bag 10 ( (FIG. 2) and an aspect along the outside of the bag 10 (FIGS. 3 and 4).
Can be appropriately combined and selected.

When a compressed gas is supplied from the inflator 8 to the bag 10 by detecting an impact at the time of a collision or the like by an acceleration sensor (not shown), the bag 10 expands and the cover 1 is expanded.
The first seam 12 is torn and protrudes out of the cover 11 (see FIG. 5). Then, when the webbing 9 is along the non-occupant side, the webbing 9 is pushed outward by the inflatable bag body 10, whereby the tension of the lap belt portion 3 increases, and the occupant P is securely attached to the seat S. Can be restrained. At this time, by forming the bag body 10 into a substantially conical shape as shown in FIG. 5, the bag body 10 can be deployed in a form that enhances the effect of protecting the occupant's neck from the chest. Since the inflated bag body 10 has a larger contact area with the occupant than a normal seat belt with only webbing, the occupant is softer and more reliably restrained / engaged in combination with the cushioning effect by gas pressure. Can be protected. Further, the webbing 9 and the bag 10 are connected to each other only at both ends in the longitudinal direction, and the shoulder belt portion 4 is free from each other, so that the webbing 9 does not interfere with the expansion of the bag 10.

In the case of a seat belt using a retractor device with an emergency locking mechanism, when the retractor shaft is locked, the wrap belt portion 3 is extended from the retractor device 2 by an amount corresponding to the tightening of the retractor shaft. Due to the tension applied to 9, the slack due to the amount fed out is canceled.

[0015]

As described above, according to the present invention, the webbing which has a high tensile strength and restrains the movement of the occupant and the bag which expands and absorbs the impact are separate from each other. The characteristics and the impact absorption characteristics required for the bag can be individually and optimally set. Moreover, only the longitudinal ends of the bag and the webbing are connected to each other, and the part that hits the occupant's chest is free from each other.
The wearing feeling is not impaired, and the rapid inflation of the bag body is not obstructed. Therefore, a great effect can be achieved in achieving both a normal seat belt function and an inflatable shock absorbing function at a higher level without complicating the manufacturing process.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an overall configuration of an air belt device for a front seat occupant of an automobile to which the present invention is applied.

FIG. 2 is a cross-sectional view of the belt in a state in which the webbing is wrapped around the occupant in the bag body, taken along line II-II in FIG. 1;

FIG. 3 is a cross-sectional view of the belt in a state in which the webbing extends along the occupant side outside the bag body, taken along line II-II in FIG. 1;

FIG. 4 is a cross-sectional view of the belt in a state in which the webbing extends along the side opposite to the occupant outside the bag body, as viewed along the line II-II in FIG.

FIG. 5 is a perspective view showing a state where the bag body is inflated.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Center pillar 2 Retractor device 3 Wrap belt part 4 Shoulder belt part 5 Tongue plate 6 Buckle 7 Shoulder anchor 8 Inflator 9 Webbing 10 Bag body 11 Cover 12 Seam 13 Seam

Claims (1)

[Claims] 1. A seatbelt device comprising a bag inflated by high-pressure gas to protect an occupant from an impact such as a vehicle collision, wherein the bag is stretched over at least a shoulder to a waist of the occupant. A seat belt device which is separate from the webbing and is provided side by side with the webbing, and wherein only both ends in the longitudinal direction are bonded to the webbing.