JPH06270756A - Air bag foundation and manufacture of air bag for front passenger seat using this foundation - Google Patents

Abstract

PURPOSE:To automate the manufacture of an air bag by sewing at the time of manufacturing an air bag for a front passenger seat so as to reduce the cost and simultaneously accelerate the reset of initial protrusion at the expanded time of the air bag utilizing the sewn part. CONSTITUTION:As air bag foundation, upper face part foundation 3 and lower face part foundation 4 are integrally extended from the upper and lower end parts of bottom face part foundation 1 for receiving an occupant at the expanded time, and individual sides are seamed respectively from both side edge parts of the upper face part foundation 3, lower face part foundation 4 and bottom face part foundation 1 so as to integrally extend approximately triangular face part foundations 5, 6, 7 forming the side face parts of an air bag of quadrangular pyramid shape, thus forming cloth in one piece. It is so formed that the parts forming lateral pairs are overlapped coinciding with each other at the time of seaming three pairs of side face part foundations 5, 6, 7, and the foundation is bent and seamed by a specified method to manufacture the air bag.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag device for automatically inflating and protecting an occupant in the event of a vehicle collision, and more particularly, to a base fabric for an airbag for a passenger seat of the device, and The present invention relates to a method of manufacturing a passenger seat airbag using this base cloth.

[0002]

2. Description of the Related Art An air bag system is used when a vehicle collides.
A safety device that protects an occupant by inflating the bag instantaneously as an aid to the seat belt when the impact is more than a predetermined value, usually an inflator which is a gas generator, a bag which is inflated by the gas of the inflator, and the inflator. And an airbag case that stores the same together with the bag. When the airbag device is operated, the gas ejected from the inflator due to an electric signal fills the airbag case and the airbag to generate an internal pressure, and the internal pressure causes the bag to be instantly deployed.

By the way, the airbag device is not limited to the one for the driver's seat, but in recent years, one for the passenger seat has been developed. The airbag body of the passenger side airbag device is composed of a main body cloth sewn in a cylindrical shape and substantially triangular side surface cloths sewn on both side surfaces of the main body cloth. A rectangular opening is provided in a part of the peripheral surface to serve as a gas inlet of the inflator. Further, four retainer mounting portions made of a cloth different from the main body cloth are sewn into the opening so as to form a bag shape, and the retainer mounting portions are provided with the retainer inserted thereinto to form the airbag case. Fixed to.

[0004]

However, in the above-mentioned conventional airbag, since the bag is formed by stitching the main body cloth, the side cloth, and the cloths constituting the mounting portion as described above, the respective parts are sewn. The sewing, especially the side edge of the main body cloth and the outer peripheral edge of the side cloth, must be sewn in a curved and three-dimensional manner. Therefore, in order to create the above-mentioned airbag, manual operation is required. A lot of man-hours were required, which was a bottleneck in automation of sewing.

Further, Japanese Patent Publication No. 52-4371 discloses that
Although an airbag constructed by a single piece of base cloth is disclosed, even in such an airbag, since the base cloth is not appropriately cut, an extra portion remains after sewing, and the remaining portion is left behind. There is a problem in that the airbag is made heavy and the rest is obstructive, and it is difficult to automate sewing by a machine.

To explain this in detail, in the airbag as described above, when the base wall and the side wall are formed, the triangular extending portion and the side edge portion with the ear are formed. This triangular extension tends to widen as the base wall attempts to have a larger area for the occupant, and the side edges with ears tend to widen as they attempt to taper. These two parts are
It is a wasteful part for restraining the occupant, which is the original purpose of the airbag, and these two parts take up a volume when stored in the instrument panel, increase the weight, lose the flexibility of the airbag, and become stiff and stiff. Will be
It gets in the way when folded. Further, the side wall portions are sewn together at the free end portions of the folded body wall portion, which is further disadvantageous.

Regarding the shape of the airbag, first, the side edges with ears of the upper and lower body walls are sewn by a stitching stitch row, but generally such a rectangular or square material is folded and sewn. At that time, the material is cut from the roll material in the case of mass production, the long side of the rectangle is taken in the roll direction, and the short side is taken in the roll width direction,
Further, in the case of a square, the material is taken by arranging it in parallel with the roll direction, and therefore in any case, the weft direction of the stitching stitches is parallel. If it is arranged diagonally with respect to the roll direction, the roll width must be large, and the width of a general loom is not sufficient, so new equipment investment is required, and the yield is also reduced, which is uneconomical. The width is generally about 1.5m, and the circumference of the airbag when viewed from the vehicle side is about 2m).

Further, when sewing cloths with each other, rather than sewing the textures in parallel with each other, the textures are angled with each other.
In other words, it is known that sewn at the bias is stronger, but the peripheral length of the sheet material is determined by the length of the base wall and the two body walls. The bag has a restriction that the shape viewed from the vehicle side surface is symmetrical with respect to the row of stitches, and if the bag is an isosceles triangle, there is a restriction that the bag is inclined with respect to the vertical direction in order to secure the same base wall area. The side shape of the airbag is a substantially triangular shape having an upper surface generally along the windshield, a lower surface passing along the instrument panel near the knees of the occupant, and a front surface substantially facing the occupant. There is a demand for design and shape flexibility that is ideal in terms of cost and that can satisfy the constraints on the vehicle.

In the sewing method, a skilled technique is required when the stitch binding row is not straight or when the side walls are folded along the stitch binding line and sewn together. In addition, if the stitching line passing through the side wall is linear, especially straight and set over the entire length of the side wall in the direction of airbag deployment, the force during airbag deployment will be concentrated here, so a strong sewing method should be used for this sewing part. Need to take.

SUMMARY OF THE INVENTION The present invention aims to achieve the matters described below by coping with the actual situation as described above and performing new cutting on a single piece of airbag base fabric.

1. When the shape is sewn, a wasteful shape is abolished due to the original occupant restraint that occurs when one cloth is made into a three-dimensional shape, and the outer peripheral sewing of the minimum necessary area and its sewing allowance, and the necessary In some cases, corner drop sewing is added to reduce the volume, which makes it light and easy to store in an airbag case. 2. The original suppleness of the base cloth is not lost due to the many sewn folds to make a three-dimensional shape from one piece of cloth, and the suppleness of the original base cloth is utilized. 3. By folding back which becomes an obstacle at the time of folding and sewing by folding back, the shape in which the fabric is locally bulky is eliminated and folding is facilitated. 4. Peripheral sewing should be a bias stitch to secure the strength of the sewn portion. 5. Airbag front (bottom) cloth, side cloth, top cloth, and bottom cloth are used for vehicle parts such as instrument panels and windshields, as well as for the occupant's posture, considering the opening position and opening dimensions of the airbag case. Increase flexibility in design and shape. 6. Peripheral sewing is all straight stitching, and a shape that can be sewn without advanced skill. 7. The sewn portions that face each other with respect to the folding line are aligned so that the cloth can be sewn without sagging the cloth or realigning the sewn portion for each sewing. 8. The sewing that passes through the side surface part is divided into two parts from a certain part without extending over the entire length of the side surface, so that the pulling force due to the protrusion when the airbag is deployed does not exert a large tensile force on the linear sewing part. 9. It is possible to angle the sewing that extends in the deployment direction by sewing through the side parts, and the pulling force due to the projection when the airbag is deployed is not directly applied to the sewing part, but the amount of protrusion of the airbag is reduced by this sewing part The strap effect of quickly recovering from the protruding state to the initial design shape is realized without using a separate strap cloth.

[0012]

That is, the feature of the air bag base fabric of the present invention which meets the above-mentioned object is that it is tapered from the mouth portion fixed to the opening portion of the air bag case to the bottom portion for receiving the occupant. In an air bag base cloth forming a substantially quadrangular pyramid-shaped air bag as shown in FIGS. 8 and 9, as shown in FIG. 1, from the upper and lower end portions of the bottom surface base cloth 1, respectively, upper surface portions are formed. The base cloth 3 for the lower surface and the base cloth 4 for the lower surface portion are integrally extended, and the base cloth 3 for the upper surface portion, the base cloth 4 for the lower surface portion, and both side edge portions of the base cloth 1 for the bottom surface portion, respectively. , A side surface of the quadrangular pyramid is formed by stitching the individual sides, and a substantially triangular base cloth for upper side surface 5,5 and base cloth for lower side surface 7,7, and a base cloth for bottom side surface 6 and 6 are integrally extended, and the base fabrics 5 and 5 for the upper side surface and the bottom side Each side 5b ... 6a adjacent to each other parts base fabric 6,6, base fabric for the upper surface of the base fabric as shown in FIG. 4 3
And the bottom side base cloth 1 when folded in half at the boundary line 8 of the bottom side base cloth 1, the left and right sides are formed to overlap with each other, and the lower side surface base cloths 7 and 7 and the bottom side surface base are formed. 6b of the cloths 6 and 6 which are adjacent to each other when the base cloth is folded in two at the boundary line 9 between the base cloth 4 for the lower surface part and the base cloth 1 for the bottom surface as shown in FIG. 7a which are formed such that the sides of the upper side surface portion base fabrics 5 and 5 and the lower side surface portion base fabrics 7 and 7 are most distant from each other are formed, for example, as shown in FIG. As shown in, when the base portions of the base cloth are brought into contact with each other and polymerized, the right and left sides are formed so as to be coincident with each other and superposed.

In addition, the method for manufacturing a passenger airbag according to the present invention uses the above-described airbag base fabric. As shown in FIG. Folded in two at the boundary line 9 of the base cloth 1 for the bottom surface, each side 7 of the base cloth 7, 7 for the lower side surface and the base cloth 6, 6 for the bottom side surface adjacent to each other.
b ... 6b are superposed and sewn on each of the left and right sides, and as shown in FIG. 4, the base cloth is folded in two at the boundary line 8 between the base cloth 3 for the top surface and the base cloth 1 for the bottom surface, and the upper side surface. Sides 5 of the base fabrics 5, 5 and the bottom side face fabrics 6, 6 which are adjacent to each other
b ... 6a are superposed and sewn on each of the left and right sides, and, for example, as shown in FIG. 5, base fabrics are superposed with their mouth portions butted together to superpose upper side face base fabrics 5, 5 and lower side face part bases. The steps of superposing each side 5a ... 7a of the cloths 7, 7 which are most distant from each other and stitching them on the left and right sides respectively, and the step of turning over the airbag base cloth sewn as described above to form an airbag bag body. It is characterized by having.

[0014]

By carrying out the manufacturing method of the present invention using the airbag base cloth of the present invention, a passenger seat airbag having a substantially quadrangular pyramid shape is formed of a single piece of base cloth. Thus, it becomes possible to perform linear and planar sewing, and the airbag bag can be manufactured by automatic sewing by a machine. When sewing, each side of the sewn portion is formed so that the left side and the right side overlap with each other.Therefore, from one sewing to the other, it is continuous without re-aligning the sewn portion of the base cloth. By doing this, it is possible to perform the sewing work and speed up the work even without a high level of skill.

On the other hand, in the airbag made of the base fabric of the present invention, the laterally Y-shaped sewn portion is formed on the side surface portion, and the laterally Y-shaped horizontal portion is the airbag. Restricting the expansion in the occupant direction when the bag is expanded and inflated, and the Y-shaped bifurcated portion vertically distributes the expansion force in the occupant direction to facilitate the relaxation of the initial protrusion when the bag is inflated and its return. You can

Further, by changing the lengths of the respective sides of the side surface base cloth, the airbag bag can be designed in an arbitrary shape, whereby the module setting position and the occupant's positional relationship. The size and shape of the airbag can be redesigned according to the above.

[0017]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a plan view of an airbag base fabric of an embodiment of the present invention, FIGS. 2 to 5 are plan views showing a method of manufacturing an airbag using the same fabric, and the airbag after sewing is shown in FIG. As shown, it is for a passenger seat and has a substantially quadrangular pyramid shape that spreads in a tapered shape from a mouth portion A ₂ fixed to an opening portion of an airbag case to a bottom surface portion A ₁ that receives an occupant.

On the other hand, as shown in FIG. 1, the air bag base cloth has a trapezoidal base cloth 3 for the upper surface and a lower surface for the base cloth 1 for the bottom surface which constitutes the bottom surface A _1. The base cloth 4 is integrally extended, and the respective side edges of the base cloth 3 for the upper surface portion, the base cloth 4 for the lower surface portion, and the base cloth 1 for the bottom surface portion are sewn together to sew the respective sides, and A single piece in which the base cloths 5 and 5 for the upper side surfaces, the base cloths 7 and 7 for the lower side surface parts, and the base cloths 6 and 6 for the bottom side surfaces, which form the side surface portion of the pyramid, are integrally extended. Made of cloth.

According to the present invention, the lower side surface base cloth 7 is used in contrast to the airbag base cloth formed by the three pairs of side surface base cloths 5, 6 and 7 described above. , 7 and the bottom side surface base cloths 6 and 6 that are adjacent to each other 7b ... 6b, as shown in FIG. 2, the base cloth is a boundary line between the bottom surface base cloth 4 and the bottom surface base cloth 1. When folded in two at 9, the left and right sides are formed so as to overlap with each other and overlap,
The base fabrics 5 and 5 for the upper side surfaces and the base fabrics 6 and 6 for the bottom side surfaces
As shown in FIG. 4, the sides 5b ... 6a adjacent to each other are
2 at the boundary line 8 between the base cloth 3 for the top surface and the base cloth 1 for the bottom surface.
When folded, the left and right sides are formed so as to coincide with each other and overlap with each other, and further, the sides 5a of the upper side surface base cloths 5, 5 and the lower side surface side base cloths 7, 7 that are most distant from each other ... 7a
As shown in FIG. 5, when the mouth portions 2 and 2 of the base cloth are brought into contact with each other and superposed, the left and right sides are superposed with each other and superposed.

The airbag base fabric of the present invention will be described in more detail with reference to the embodiment shown in FIG. 1. The airbag base fabric has a symmetrical shape with respect to the center line L,
The longitudinal direction at the top and bottom in the figure is the roll winding direction of the raw fabric, and the transverse direction is the width direction of the roll. And, as shown in the drawing, a sewing margin M having a predetermined width is attached to each side of the side face base cloths 5, 6, and 7.

The bottom surface base cloth 1 is preferably rectangular or square, and the top surface base cloth 3 and the bottom surface base cloth 4 are:
The left and right sides 10, 10, 13, 13 are formed in an equal isosceles trapezoid. Here, in the right half of the figure, the side 11 forming the side edge of the bottom face base fabric 1 is extended as shown, and the upper side face part base fabric 5, the lower side face part base fabric 7, and the bottom part are formed. From each of the triangular vertices of the side surface base cloth 6, the side 1
When the perpendicular lines 5c, 6c, and 7c are dropped on 1 to form four further right-angled triangles a, b, c, and d, the triangles a and b, and the triangles c and d are symmetrical. Also perpendicular 5
The angle γ formed by c and the side 5a is the same angle as the angle γ formed by the perpendicular line 7c and the side 7a, and this angle γ is equal to the sum of the illustrated angles α and β.

It is preferable that the values of the angle α and the angle β do not match. To explain this, the sewing forming the side surface portion is roughly bifurcated in the middle, not extending over the entire length of the side surface cloth extending from the attachment portion of the airbag to the front cloth. At this time, the angles α and β
If they do not match, the sewing extending first from the attachment portion toward the rear of the vehicle with respect to the bag deploying direction can be angled with the bag deploying direction. As a result, the pulling force due to the airbag protrusion is not applied to the straight sewn portion, but is received by the cloth weave itself. It is possible to realize the strap effect of quickly recovering from the protruding shape to the design shape of the initial purpose.

As described above, the airbag base fabric of the embodiment of the present invention has been described by taking the right half as an example, but the left half of the base fabric is also symmetrical to the right half as described above, as described above. The composition is the same as half.

Next, a method of determining a general cutting shape of the airbag base cloth will be described. In the airbag, since the shape of the base fabric 1 for the bottom portion that directly protects the occupant, that is, the sides 11 and 8 (9) partitioning this is an important condition in the design, first of all, it is necessary to thoroughly study it. Determine the length of (9).
Next, the position of the base cloth 1 for the bottom surface in the vehicle length direction is examined for the occupant, and the heights of the trapezoids of the base cloth 3 for the upper surface and the base cloth 4 for the lower surface are determined. In FIG. 1, sides 8 and 14
And the distances of the sides 9 and 15 in the center line L direction. And
The cutting shape is determined by adjusting the lengths of the sides 14 and 15 of the mouth portion and the angles α and β. The sides 14 and 15 are
As shown in a typical mounting shape of the airbag and the case, which will be described later, there is no restriction that the mounting dimension of the case is required.

Next, the process of sewing an airbag using this cut piece of cloth will be described. Although the right half of the center line L will be described, the left half and the symmetrical portion are exactly the same as the right half.

FIG. 2 shows a state in which the lower surface side base cloth 4 and the side surface base cloth 7 are first folded back along the side 9 as a boundary line. In this state, the sides 7b and 6b are completely the same in length and position, and the positions of the sides 7c and 6c also overlap. Here, first, the side 7b and the side 6b are sewn by straight stitching. Then, in this state, when the front end side of the lower surface base cloth 4 is folded back on the sides 7c and 6c, the state shown in FIG. 3 is obtained.

Next, as shown in FIG. 4, the upper surface base cloth 3 and the side surface base cloth 5 are folded back on the side 8 as a boundary line to the side where the lower surface base cloth 4 is folded back. . At this time, the sides 6a and 5b are completely the same in length and position,
The positions of the side 6c and the side 5c also overlap. That is, here, the sides 6c, 5c, and 7c are located on the same line. In this state, the side 6a and the side 5b are sewn by straight line sewing.

Then, as shown in FIG. 5, with the side 6c as a boundary, the base cloth 1 for the bottom surface and the base cloth 6 for the side surface thereof between the extension line of the side 6c and the side 9 and the side 9 are provided. Simultaneously with the lower side base cloth 4 and the side cloth 7 between the extension lines of the side 7c, the side 8,
Fold back to the side opposite to the side that was folded back at side 9. Edge 6 at this time
Below the extension line of c, the base cloth 3 for the upper surface portion between the extension lines of the sides 14 and 5c and the base cloth 5 for the upper side surface portion thereof, and the side 15
The base cloth 4 for the lower surface and the base cloth 7 for the lower side surface of the base 7 between the extension lines of the side 7c and the side 7c are overlapped with each other, and the sides 5a and 7a are completely the same in length and position. In this state, the side 5a and the side 7a are sewn by straight line sewing.

After sewn in this way, if it is desired to drop the corners of the base cloth 1 for the bottom portion, it is possible to sew on the N line shown in FIG. 4 to drop the corners as if they were pinched. As described above, all the steps can be sewn by straight line sewing.

Finally, the sewing bag is turned inside out so as to be pulled out from the openings of the sides 14 and 15, so that a substantially pentahedral-shaped airbag of a substantially quadrangular pyramid in which the sewing margin is not visible is completed.

In the above description, the folding back is started from the lower surface base cloth 4, but the same applies when the upper surface base cloth 3 is folded back. Further, first, the side 9 for the lower surface base cloth is folded back, then the side 7c is folded again, and then the side 8 for the upper surface base cloth 3 is folded back to the sides 6a and 5b.
Are sewn in a straight line, the upper surface base cloth 3 side and the lower surface base cloth 4 side are folded back on the side 6c at the same time, and after the side 6b and the side 7b are sewn in a straight line, the side 5a and the side 7a are formed by the method described above. May be sewn straight. At this time also, the folding may be started from the upper surface base fabric 3. FIG. 6 shows a completed sketch of the airbag by this process.

Next, a typical air bag mounting method,
The shape of the airbag according to the present invention will be described. Figure 7
A typical air bag attachment method is shown below. In general, the shape of an instrument panel of a vehicle has an upper surface that is substantially horizontal with a vertical surface facing the occupant as shown in FIG. The attachment of the airbag is classified depending on whether an opening is provided on either the vertical surface or the upper surface and a case or the like is built in. Figure 7
Is a comparison of the two types viewed in the same cross section.

FIG. 8 is a sketch of the instrument panel upper surface mounting type of the present invention. The retainer mounting surface is set by extending the end of the base cloth 3 for the upper surface, and the U-shaped notch is provided in the base cloth 4 for the lower surface. A slit is inserted at the end and cut and raised to form the retainer mounting surface. .

On the other hand, FIG. 9 is a sketch of the instrument panel vertical surface mounting type. The upper part base cloth 3, the lower surface part base cloth 4, and the side cloth, which are shaped like if the top part of the airbag according to the present invention is cut, are extended to form the retainer mounting surface.

In the above, the base fabric of the embodiment has been described by taking the right half as an example. However, in the above-mentioned sewing, in the present invention, each side which is a sewn portion is formed so that the right and left sides are overlapped with each other so as to overlap with each other. , From one sewing to the other sewing, it is possible to work continuously without realigning the sewn portion of the base fabric, which enables the sewing work to be performed without high skill and It is possible to speed up.

[0036]

As described above, according to the present invention, as a base fabric for an airbag, a base fabric for a bottom face portion for receiving an occupant at the time of deployment is formed from an upper and lower end portion of the base fabric for a top face portion and a base fabric for a lower face portion, respectively. And the side surface of the quadrangular pyramid-shaped airbag by sewing the respective side edges of the base cloth for the upper surface portion, the base cloth for the lower surface portion, and the base cloth for the bottom surface portion, respectively. To form a single piece of fabric by extending the substantially triangular side face base fabrics together, and further, when the three pairs of side face base fabrics are sewn together, a pair is formed on the left and right sides. The airbag is manufactured by forming it so that the parts to be formed coincide with each other and polymerizing, and by bending and stitching this base cloth by a predetermined method, an airbag for a passenger seat having a substantially quadrangular pyramid shape is formed. It is composed of one piece of base fabric cut as described above, and each part is directly sewn. Manner and by you allow dimensionally, with occupies performed automated by all the manufacturing of airbag machine according sewing, sewing portion serving each side,
Since the left and right sides are formed so as to match and overlap,
From one sewing to the other continuously, it is possible to work without re-aligning the sewn part of the base fabric, which allows the sewing work to be performed without having a high level of skill and securing personnel. It is possible to contribute to omitting education, reducing man-hours, and reducing costs.

Further, in the airbag made of the base fabric of the present invention, the laterally Y-shaped sewn portion is formed on the side surface so that the laterally Y-shaped horizontal portion is formed in the airbag. Of the Y-shaped bifurcated portion vertically disperses the extension force in the occupant direction when the bag is inflated, thereby efficiently alleviating the protrusion when the bag is inflated. By changing the length of each side of the side surface base cloth, the airbag bag body can be deformed into an arbitrary shape, according to the module setting position and the positional relationship of the occupant,
It also has the effect that the design of the airbag can be changed to a size and shape that maximizes occupant restraint performance very easily.

Further, according to the present invention, as compared with the conventional method, since the outermost vertices of the triangles forming the side surface portion are all located at the same distance in the roll width direction, the roll width is With the particular triangular shape of which the parts are made, it is possible to save unconstrained. According to the present invention, when sewing an airbag, since the outer peripheral sewing is performed in the minimum necessary outer peripheral sewing and the sewing allowance is made from one piece of cloth into a three-dimensional shape, the finished shape is not wasted. It is possible to use a small-capacity airbag case that is lightweight and easy to store in the airbag case.

Further, in the outer peripheral sewing, the weaving direction of the base cloth coincides with the roll direction and the roll width direction, whereby the sewing of each cloth can be a bias stitch. The shape of the base cloth for the bottom surface and the dimensions of the base cloth for the upper surface and the base cloth for the lower surface can be changed by adjusting the side length and the angle (α, β in FIG. 1) of the mouth. In addition to the flexibility, it is possible to select the mounting structure with the airbag case as shown in FIGS. 8 and 9 even after the basic shape is determined.

Furthermore, the sewing forming the side surface portion is roughly bifurcated in the middle, not extending over the entire length of the side surface cloth extending from the attachment portion of the airbag to the airbag deployment direction to the front cloth. At this time, if the angles α and β shown in FIG. 1 are not made to coincide with each other, it is possible to make an angle with the bag unfolding direction in the sewing extending first from the attachment portion toward the rear of the vehicle with respect to the bag unfolding direction. As a result, the pulling force due to the airbag protrusion is not applied directly to the sewn portion, but is received by the cloth weave itself. It is possible to realize the strap effect of quickly recovering from the protruding shape to the design shape of the initial purpose.

[Brief description of drawings]

FIG. 1 is a plan view of an airbag base fabric according to an embodiment of the present invention.

FIG. 2 is a plan view showing a first step of an example manufacturing method using the same base cloth.

FIG. 3 is a plan view showing the second step.

FIG. 4 is a plan view showing the third step.

FIG. 5 is a plan view showing the fourth step.

FIG. 6 is a perspective view showing the airbag after the completion of the fourth step.

FIG. 7 is a cross-sectional view showing a mounting pattern of an airbag to an airbag case.

FIG. 8 is a perspective view showing an airbag for an upper surface opening type airbag case.

FIG. 9 is a perspective view showing an airbag for a vertical opening type airbag case.

[Explanation of symbols]

 1 Base cloth for bottom part 2 Base part 3 Base cloth for upper surface 4 Base cloth for lower surface 5 Base cloth for upper side surface 6 Base cloth for bottom side surface 7 Base cloth for lower side surface

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takeshi Yamaji 3rd Ikuyama, Uchikoshi, Miyoshi-cho, Nishikamo-gun, Aichi Prefecture Toyo Tire & Rubber Co., Ltd. Automotive Parts Technology Center (72) Inventor Koji Sugiura Nishikamo-gun, Aichi Prefecture 3 Yoshigayama, Mitsuki-cho, Ikayama, Toyo Tire & Rubber Co., Ltd. Automobile Parts Technology Center (72) Inventor Toru Ozaki 3 Yoshioka, Nishikamo-gun, Aichi Prefecture, 3 Okayama, Toyo Tire & Rubber Co., Ltd. Inside the surgery center

Claims (2)

[Claims] 1. A base fabric for an airbag, which comprises a base portion for receiving an occupant from a mouth portion fixed to an opening portion of an airbag case, and forming a substantially quadrangular pyramid-shaped airbag that spreads in a taper shape. The base cloth 3 for the upper surface part and the base cloth 4 for the lower surface part are integrally extended from the upper and lower ends of the cloth 1, respectively, and the base cloth 3 for the upper surface part, the base cloth 4 for the lower surface part, and the bottom surface part. Each of the side edges of the base cloth 1 is sewn to form a side surface of the quadrangular pyramid, and each side is sewn to form a side surface of the quadrangular pyramid. 7, 7 and the bottom side surface base cloths 6, 6 are integrally extended, and further, the adjacent side edges of the upper side surface base cloths 5, 5 and the bottom side surface base cloths 6, 6 are adjacent to each other. 5b ... 6a
Is a boundary line 8 between the base cloth 3 for the top surface and the base cloth 1 for the bottom surface.
When folded in two, the left and right sides are formed so as to coincide with each other and overlap each other, and the sides of the lower side surface base fabrics 7, 7 and the bottom side surface base fabrics 6, 6 that are adjacent to each other are formed. 7b ... 6b
The base cloth is a boundary line 9 between the bottom surface base cloth 4 and the bottom surface base cloth 1.
When folded in two, the left and right sides are formed so as to coincide with each other and overlap with each other, and the sides of the upper side surface base fabrics 5, 5 and the lower side surface base fabrics 7, 7 that are most distant from each other. 5a ... 7a
The base fabric for an air bag is characterized in that when the base portions of the base fabric are brought into contact with each other and polymerized, the right and left sides are superposed so that they are superposed with each other. 2. The airbag base fabric according to claim 1,
2 at the boundary line 9 between the base cloth 4 for the bottom surface and the base cloth 1 for the bottom surface.
Steps of folding the base fabric for lower side portions 7, 7 and base fabrics 6, 6 for the bottom side portions and adjoining adjacent sides 7b ... The base cloth 3 for the bottom surface and the base cloth 1 for the bottom surface portion are folded in two at the boundary line 8 and the adjacent side surfaces 5b ... 6a of the base cloths 5, 5 for the upper side surface portions and the base cloths 6, 6 for the bottom side surface portions are separated from each other. The process of superposing and suturing on both the left and right sides, and superimposing the base fabrics by bringing the mouth portions into contact with each other, the upper side face base fabrics 5 and 5 and the lower side face part base fabrics 7 and 7 being the most separated from each other. .. 7a are superposed and sewn on both the left and right sides respectively, and the airbag base fabric sewn as described above is turned over to form an airbag bag body. Manufacturing method.