JPH0687393A - Air bag device - Google Patents

Abstract

PURPOSE:To provide an air bag device which is easy to fold, smooth to develop and expandable into a preset shape. CONSTITUTION:An air bag has an inflator 21 set up at the innermost side of an air bag case 20, an air bag 10 folded and stored on the inlet side and its blow port 10a fixed to the inside wall on the inlet side of the air bag case 20. The air bag 10 is expanded around the blow port 10a, a back cloth on the blow port side where it laterally blows out of the right and left side extension line of the blow port is folded to the inside in a right and left alternate manner to form folds 10j, 10k, the following right and left back cloth and face cloth in layer are folded to the face side to form a band structure 10A and the band structure 10A is folded in a bellows shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air bag device suitable for mounting on a passenger seat of an automobile.

[0002]

2. Description of the Related Art As an airbag device to be installed in a passenger seat of an automobile, an airbag having a substantially quadrangular pyramid shape and a rectangular air inlet having a long rectangular shape at the top thereof and a horizontally long cylindrical shape. An inflator and an airbag case, the inflator is installed in the back of the airbag case, and the airbag is folded and stored on the inlet side thereof.
It is known that the blowing port is fixed to the inner wall of the inlet portion of the airbag case. FIG. 5 shows an example of the airbag 1. In the airbag 1, a belt-shaped cloth 1a having a central portion in the lengthwise direction formed wider than both ends is curved in a U-shape, and the left and right side edges thereof are formed. A substantially triangular side cloth 1b, 1b is sewn on to form a substantially quadrangular pyramid shape, and a bag-shaped attachment cloth 2a is provided on the horizontal and vertical sides of the oblong rectangular blowing port 1c provided on the top thereof. And 2b are attached, and a vent hole 1d is opened in the side cloth 1b.

[0003] The airbag 1 is composed of left and right side cloths 1.
Fold b and 1b into the center of the inside of the strip 1a (dotted line 1
e and the chain line 1f), the outer surface width of the strip-shaped cloth 1a is adjusted to the width of the lateral side of the blow-in port 1c over the entire circumference (see the left and right chain lines 1g and 1g), and then as shown on the left side of FIG. The cloth 1a is folded into a bellows shape, and this is compressed up and down to form a compact shape (see the right side of FIG. 6) having substantially the same size as the rectangular parallelepiped formed by the mounting cloths 2a and 2b. Then, the attachment cloths 2a, 2 of the compressed airbag 1 are
b is fixed to the inner wall of the inlet portion of the airbag case 3 (see FIG. 7), the compressed airbag 1 is pushed into the inside, and the lid 5 is closed. A horizontally long cylindrical inflator 4 is installed in the back of the airbag case 3.

[0004]

In the above airbag device, the side cloths 1b, 1b of the airbag 1 are pushed into the inside of the belt-like cloth 1a while the side cloths 1b, 1b are unfolded, and the belt-like cloth 1a is folded in a bellows shape to form an airbag case. Since it is attached to No. 3, it is necessary to fold the side cloths 1b, 1b while allocating the side cloths 1b, 1b to the left and right when folding the bellows, which makes the bellows folding work troublesome, and the shape after folding is bulky and smoother. There was a problem that it was necessary to take a space at the time of storage in order to perform various expansions.

The present invention provides an airbag device which can be easily folded, including bellows folding, and can be smoothly expanded and inflated into a predetermined shape.

[0006]

The airbag device of the present invention comprises an airbag provided with a horizontally long rectangular blow-in port for blowing gas, a horizontally long cylindrical inflator, and an airbag case. In the airbag device in which the inflator is installed in the back of the airbag case, the airbag is folded and stored on the inlet side, and the blowing port is fixed to the inner wall of the inlet portion of the airbag case. The bag is unfolded centering on the air inlet, and only the back cloth on the air inlet side of the part that extends laterally from the left and right side extension lines of the air inlet is alternately folded inside and over, and then the above. The left and right back cloths and the front cloth following the fold-in portion are overlapped and folded so as to be folded toward the front cloth side to form a band-shaped body having a width substantially equal to the width of the blow-in port, and the band-shaped body is folded in a bellows shape. And said that you are.

[0007]

[Function] The left and right sides of the expanded airbag are folded to form a belt-like body, and only the rear surface cloth of the expanded airbag is alternately folded to the inside, and then the rear surface cloth continuing to the above-mentioned folded portion. Further, since the surface cloths are overlapped and folded on the front side, the above-mentioned belt-like body is formed into a belt-like shape extending in the front-rear direction with respect to the blowing port. Therefore, the airbag deploys in the two vertical directions at the initial stage of deployment, and slightly later, the central portion deploys, so that the airbag smoothly deploys into a predetermined shape. Also, since the left and right sides of the airbag in the unfolded state are folded in parallel with the surface cloth facing the blowing port, folding is facilitated, mechanical folding is possible, and bulkiness after folding is reduced. .

[0008]

EXAMPLE In FIG. 1, the upper left airbag 10 is
Similarly to the above, it is a quadrangular pyramid shape consisting of a strip-shaped cloth 11 and left and right side cloths 12, 12, and a blowing port 10 at the top thereof.
Bag-shaped attachment cloths 13 and 14 are attached to a, and a vent hole 12a is opened in the side cloth 12. As shown in the upper right of FIG. 1, the airbag 10 is spread with its blowing port 10a and the attachment cloths 13 and 14 directed upward (toward the front of the page). Airbag 10 at that time
The cross-sectional shape of is shown by the chain line in FIG. 10b is a back cloth forming a conical surface, and 10c is a front cloth forming a bottom surface.

Portions outside the left and right edges of the blowing port 10a of the airbag 10 are folded downward, so that the airbag 10 has the belt-shaped body 10 shown in the middle right of FIG. 1 and FIG.
Formed in A. In this case, the back surface cloth (the cloth on the side of the air inlet 10a, see FIG. 2) 10b of the airbag 10 is alternately folded inward, and the folded portion from the left forms the uppermost fold 10j, and from the right. Fold 1 is the second fold 1
Form 0k. Then, the right side back surface cloth 10b and the front surface cloth 10c following the second fold line 10k are overlapped, the end side is folded up to form a fold line 10p, and the fold line 10k is folded down in the middle of the fold lines 10k and 10p. Fold 1
0q is formed, whereby the third fold line 10 is formed.
p moves to the lower surface. Similarly, the left side back cloth 10b and the front side cloth 10c following the first fold line 10j are folded to form fold lines 10r and 10s (see FIGS. 1 and 3), and the left and right fold lines 10p and 10r are formed in the lowermost layer. Are piled up against each other.

The band-shaped body 10A is folded into a bellows shape as shown in the middle left of FIG. However, the strip 10A shown in the middle left of FIG. 1 is represented by two lines of only the uppermost cloth and the lowermost cloth constituting the strip 10A. And
When the above band-shaped body 10A is bellows-folded, the bellows-folded portion is rolled in the direction of arrow p toward the lower side of the attachment cloths 13 and 14, and constitutes the lowermost layer of the portion facing the blowing port 10a. A block 10B having a rectangular parallelepiped shape is formed under the surface cloth 10c and compressed in the left-right direction, and has substantially the same plane shape as the rectangular blow-in port 10a surrounded by the attachment cloths 13 and 14.

The block 10B of the airbag 10 is
The airbag case 20 shown in the lower part of FIG. 1 is mounted.
The airbag case 20 has a horizontally long opening 20a on the front surface (left in the drawing), and is provided with a horizontally long cylindrical inflator 21 on the inner back side, and a nozzle 21a for ejecting gas is provided on both upper and lower surfaces of the inflator 21. It is provided in the shape of a horizontally long slit. Then, the attachment cloths 13 and 14 projecting from the block 10B of the airbag 10 are attached to the inside of the opening 20a of the airbag case 20 with the strainer 22 and the screw 23, and then the block 10 described above.
B is pushed inside the attachment cloths 13 and 14 so that the fold line formed by the bellows fold is inserted into the lower half of the inflator 21, and the opening 20a is covered with the lid plate 24.

In the embodiment shown in FIG. 4, the upper edge with respect to the opening 20a of the airbag case 20 is provided so as to recede from the lower edge, and the internal space of the airbag case 20 is narrow in the upper half portion and the lower half portion. The block 10B of the airbag 10 is loaded in the wide lower half portion. The upper auxiliary cloth 15 and the lower auxiliary cloth 16 are sewn to the blow-in port 10c of the airbag 10, and the upper auxiliary cloth 15 and the lower auxiliary cloth 16 are hung on the surface of the block 10B, and the upper part Covered with a lid plate (not shown).

The airbag case 20 has the opening 20 inside the instrument panel of the passenger seat of the vehicle.
It is fixed with a facing backward. When the vehicle is impacted by a predetermined value or more due to a collision or the like, gas is jetted from the upper and lower nozzles 21a of the inflator 21 and the airbag 1
0 is blown into the airbag 10 rapidly, so that the airbag 10 forming the block 10B pushes open a lid plate (not shown) of the airbag case 20 to open the passenger seat space. Pop out and deploy. At this time, the airbag 10 is separated into two upper and lower directions as shown by a chain line 10C in FIG.
As shown in, it is developed into a regular quadrangular pyramid shape or spherical shape to protect the passenger in the passenger seat. On the other hand, in the conventional apparatus, first, the expansion is performed as shown in 1A of FIG.

[0014]

As described above, according to the airbag device of the present invention, the airbag is expanded centering on the blow-in port, and the blow-out port is a part which extends laterally from the left and right side extension lines of the blow-in port. Side back cloth is folded inward alternately to the left and right, and then the left and right back cloths and surface cloth following the folding part are overlapped and folded so as to be folded to the front side to form a strip having a width substantially equal to the width of the blower opening. However, since the belt-shaped body is folded into a bellows shape and loaded in the airbag case, it becomes easy to form the belt-shaped body by folding and to fold the belt-shaped body into a bellows, and thus it is possible to mechanize the folding.

Further, since the above-mentioned belt-like body is formed in a belt-like shape extending in the vertical direction of the blowing port, the airbag can be deployed smoothly and inflated into a predetermined shape. Also,
According to the invention described in claim 2, when the airbag is stored in the airbag case, the fold on the inflator side is pushed under the inflator.
It has excellent storability.

[Brief description of drawings]

FIG. 1 is a process explanatory view showing an assembly sequence of an embodiment.

FIG. 2 is a cross-sectional view showing how to fold an airbag.

FIG. 3 is a perspective view in which a band-shaped body made of an airbag is partially broken.

FIG. 4 is a vertical sectional view of an example.

FIG. 5 is a perspective view illustrating a conventional method of folding an airbag.

FIG. 6 is an explanatory view of a conventional bellows folding.

FIG. 7 is a vertical cross-sectional view of a conventional airbag device.

[Explanation of Codes] 10: Airbag 10a: Blow-in port 10b: Airbag back surface cloth 10c: Airbag front surface cloth 10j, 10k, 10p, 10q, 10r, 10s: Fold line 10A: Band-shaped body made of air bag 10B : Block consisting of a belt-shaped body of an airbag 10C: Airbag in the initial stage of deployment 10D: Airbag in the final stage of deployment 11: Band-shaped cloth 12: Side cloth 12a: Vent holes 13, 14: Mounting cloth 15, 16: Auxiliary cloth 20: Air Bag case 20a: Opening 21: Inflator 22: Strainer 23: Mounting screw 24: Lid plate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Motoaki Naruse No.3 Igayama, Uchikoshi, Miyoshi-cho, Nishikamo-gun, Aichi Toyo Tire & Rubber Co., Ltd. Automotive Parts Technology Center (72) Inventor Takeshi Yamachi Nishikamo, Aichi Prefecture Gunma Miyoshi-cho Ochikoshi 3 Igayama Toyo Tire & Rubber Co., Ltd. Automobile Parts Technology Center (72) Inventor Toru Ozaki 3 Miyoshi-cho, Nishikamo-gun Aichi Pref. Inside the technical center

Claims (2)

[Claims] 1. An air bag provided with a horizontally long rectangular blow-in port for blowing gas, a horizontally long cylindrical inflator, and an air bag case. The inflator is installed in the back of the air bag case. Then, in the airbag device in which the above-mentioned airbag is folded and stored on the inlet side, and the blowing port is fixed to the inner wall of the inlet portion of the airbag case,
The airbag is expanded centering on the air inlet, and only the back cloth on the air inlet side of the portion that laterally extends from the left and right lateral extension lines of the air inlet is alternately folded inside and overlapped,
After that, by overlapping the left and right back cloths and the front cloth following the folding part and folding them so that they are folded toward the front cloth side, a band-shaped body having a width substantially equal to the width of the blow-in port is formed. An airbag device characterized by being folded in. 2. The airbag device according to claim 1, wherein the airbag is housed so that a fold on the inflator side is pushed under the inflator.