JPH05305851A - Air bag - Google Patents

Abstract

PURPOSE:To ameliorate the form of an air bag being installed in an instrument panel of a car. CONSTITUTION:A bag 70 to be housed in the case of an air bag module has a strip main part member 76, and a side member 74 being joined to both sides of this strip main part member 76, and it comes to a pyramidal form in time of being unfolded. The side member 74 with a polygonal plane form is composed of a side being circumscribed to a circle with a center point O. So, if this bag 70 is folded in a rectangular plane form along a bend line, this bend line is collected along a rectangular long side. Accordingly, smooth unfolding is secured and, what is more, its accommodation into the case becomes facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air bag equipped and protected in a vehicle.

[0002]

2. Description of the Related Art An airbag installed in an instrument panel of a vehicle and deployed at the time of a collision is modularized by accommodating a folded bag and an inflator for supplying gas into the bag. The module is mounted on a vehicle support member. The bag is formed, for example, by sewing a cloth-like material into a bag shape, and the bag is folded and housed in a case. For example, JP-A-3
No. 186448 discloses a bag made by stitching.

[0003]

The shape of the bag to be developed is determined according to the design of the vehicle, and the opening for introducing the gas is determined according to the shape of the case and the inflator. Generally, a bag has a structure in which two side surface members and three main body members arranged between the side surface members are sewn together. The bag is stored in the case in a folded state, but needs to be folded so as to be smoothly deployed. Therefore, it is desirable that the bag be as simple as possible when it is folded flat. The present invention improves the shape of the side member when folded in a plane,
(EN) Provided is a bag in which folding lines are gathered in a straight line to facilitate accommodation and deployment in a case.

[0004]

A bag according to the present invention comprises a belt-shaped main member and side members joined to both sides of the belt-shaped main member by joining means such as suturing, and has a bag-like expanded shape. .. The plane shape of the side member is a polygon surrounded by a tangent group of circles having a center in the side member.

[0005]

When the bag is folded into a planar shape, the fold edges are gathered in a straight line, and the bag can be easily accommodated in the case of the airbag module and can be smoothly deployed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view showing the outline of a vehicle embodying the present invention, and FIG. 2 is an overall view of an airbag. A driver's seat 12 and a passenger's seat 14 are provided inside the vehicle 10.
2. Instrument panel 20 in front of passenger seat 14
Is provided. An airbag module 50 is installed in the instrument panel 20 in the front part of the passenger seat 14.
The airbag module 50 includes cases 52 and 54 for accommodating an airbag and an inflator, and a door 60 is provided at an opening of the case.

FIG. 3 shows a situation when the airbag is in operation. When the sensor detects a collision of the vehicle 10, the inflator is activated by the electric signal to generate gas. The generated gas is folded into the case and sent into the bag housed therein to inflate the bag. The inflated bag pushes the door 60 at the opening portion outward by the internal pressure to expand the bag.

FIG. 4 shows a state in which the bag 70 is developed into a prescribed shape. The bag 70 is composed of an opening 72 that is a connection portion to the inflator side for blowing gas, a belt-shaped main member 74 that is deployed to the passenger side, side surface members 76 that are formed on both sides of the main member 74, and the like. , Sewn into a bag shape. FIG. 5 shows a shape in which the bag 70 is folded in a flat state. The plane shape is not generally rectangular, and in this case, it is necessary to fold back both sides 80 to form a rectangle.

FIG. 6 is a side view of the bag 70 of the present invention, and FIG.
FIG. 8 is a perspective view of the bag 70 in an unfolded state, and FIG. 8 is a perspective view of the bag 70 folded in a planar shape. Side member 7
4 has a polygonal plane shape, and in this embodiment, a pentagonal side member having five vertices A, B, C, D and E is shown. Each side AB, B of this pentagon
C, CD, DEP ₂ , and EAP ₃ circumscribe a circle M having a center r and a radius r. The main member 76 disposed between the side surface members 74 is a belt-shaped member, and has a rectangular planar shape. The expanded shape of the bag 70 obtained by stitching the main body member 76 and the side surface members is a polygonal column. In this polygonal bag 70, the perpendicular line OP ₁ descending from the point O to the side BC and the side OE connecting the concave vertex E and the point O are mountain-folded, and the point O and each convex vertex A, B, C ,. Side O connecting D
By folding A, OB, OC, and OD in a valley fold, it is possible to obtain a bag folded into a rectangular planar shape as shown in FIG. The bag 70 thus folded has its vertices A, B, P ₁ , C, D and E gathered in a straight line on the side edges of the rectangle. An opening 72 is provided along a side AA connecting the vertices A of both side surface members.
Face the inflator in the case, and
The airbag module is completed by folding it with C as the tip and storing it in a case.

In the illustrated embodiment, the point O is folded so that it lies inside the plane shape, but it can also be folded so that the point O lies outside. In this case, the fold line peaks and valleys may be reversed. The part drawn out to the outer side may be folded back inward to form a rectangle. In an actual bag, the width of the expanded bag on the passenger side may be larger than the width of the module case. 1. In the folded state, change the width on the module side and passenger side. 2. Keep the width constant on the passenger side, and extend and narrow down the part of the band-shaped cloth that connects to the module. 3. The width on the passenger side is constant, and in the folded state, the part connected to the module is sewn to narrow down. 4. The width on the passenger side is constant, and only the module width hole is opened. And so on.

[0011]

As described above, according to the present invention, a bag is formed by stitching a polygonal side member and a belt-shaped main member. Since the member has a shape surrounded by a straight line, it can be easily cut by a machine. In addition, since the stitching portion is also a straight line, automation of stitching becomes easy. When the bag is folded in a flat state, the bag has a rectangular shape, which makes it easy to fold it into the case and ensures reliable deployment. In addition, the fold lines are aligned with the side edges of the rectangle, so that the shape is rational for deployment.

[Brief description of drawings]

FIG. 1 is a perspective view of a vehicle embodying the present invention.

FIG. 2 is a perspective view of an airbag module.

FIG. 3 is an explanatory view showing the deployment of the airbag.

FIG. 4 is a perspective view of the expanded bag.

FIG. 5 is an explanatory view showing a general shape when the bag is folded flat.

FIG. 6 is a side view of the bag of the present invention.

FIG. 7 is a perspective view of a bag.

FIG. 8 is a perspective view showing a shape of the bag folded in a plane.

[Explanation of symbols]

 10 Vehicle 14 Passenger Seat 20 Instrument Panel 30 Occupant 50 Airbag Module 70 Bag 74 Side Member 76 Main Member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiharu Sonoda 8 Fujisawa, Kanagawa Prefecture Shelf shelf Isuzu Motors Co., Ltd. Fujisawa factory

Claims (1)

[Claims] 1. An airbag provided with a folded bag, an inflator for supplying gas to the bag, a case for accommodating the bag and the inflator, and a hinge door provided at an opening of the case, the bag comprising: An airbag that includes a belt-shaped main member and side members that are joined to both sides of the main member, and has a polygonal polygonal plan shape surrounded by a group of tangential lines.