JP2002046568A - Air bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air bag, of which developing shape at the time of the expansion is regulated to quickly complete the development even if an low output inflator is used, and which is easily manufactured at a low cost. SOLUTION: The air bag 1 is constituted by mutually combining a limb portion of a front panel 2 having four recessed portions disposed along the limb portion thereof, and a limb portion of a rear panel 3. The air bag 1 has an appearance that a limb portion of a normal type circular air bag is constricted from all directions. Therefore, an inner room of the air bag 1 is smaller in volume than that of the normal type air bag, while the air bag 1 has a simple constitution like the normal type air bag, and the air bag sufficiently quickly completes the development even when the low output inflator is used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag for protecting a human body, and more particularly to an airbag having a restricted deployment shape when inflated.

[0002]

2. Description of the Related Art As is well known, an airbag device includes an airbag and an inflator for inflating the airbag. When such an airbag device is applied, for example, as an airbag device for protecting an occupant of an automobile, an inflator is operated to eject gas in an emergency such as at the time of a vehicle collision to supply gas to the airbag and supply the gas to the airbag. Is deployed in the vehicle cabin. At this time, it is desirable that the deployment of the airbag be completed as early as possible to protect the occupant promptly.

[0003] Therefore, as a method of quickly securing the restraining force of the occupant by the airbag, an inflator having an unnecessarily high output may be used. However, in an airbag device using such an inflator, since the stress applied to the airbag and the mounting fixture increases, it is necessary to design these other components with high strength.

On the other hand, tear seams, straps, adhesives, etc., which are configured to be broken by a predetermined tension, are used.
It is used as a regulating means for regulating the shape of the airbag when the airbag is inflated. In the early stage of the inflation of the airbag, the regulating means rapidly connects the panels of the airbag to each other to reduce the capacity of the airbag. 2. Description of the Related Art There is known an airbag device configured to inflate an airbag and break or release the restricting means when the internal pressure of the airbag becomes equal to or higher than a predetermined pressure to increase the capacity of the airbag or the occupant protection area. .

According to such an airbag device, even if the inflator has a low output, the airbag can be quickly deployed after the operation of the inflator to protect the occupant.

[0006]

However, an airbag provided with such a restricting means may have a complicated structure. In such a case, the manufacturing process of the airbag becomes complicated. At the same time, costs increase.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an airbag capable of rapidly inflating even when a low-output inflator is used, which restricts a deployed shape when inflated. Accordingly, it is an object of the present invention to provide an airbag that can be easily manufactured at low cost.

[0008]

An airbag according to the present invention (Claim 1) has a first surface facing an occupant, and a second surface facing the first surface. An airbag having a chamber into which gas is introduced between a first surface and a second surface,
A part of the periphery of the airbag is a concave portion that enters the center of the airbag with respect to a line connecting the parts adjacent to each other in the peripheral direction of the airbag.

According to the airbag of the present invention, the airbag has an appearance in which the periphery is depressed by the concave portion, and the volume of the chamber inside the airbag is smaller than that of a normal airbag by the amount of the concave portion. Therefore, even when a low-output inflator is used as a gas generation source for inflating the airbag, the deployment can be completed quickly enough. In addition, the airbag of the present invention does not need to be provided with a separate restraint device such as a strap, so that it can be easily manufactured at low cost.

In this airbag, a plurality of recesses may be provided in the peripheral direction of the airbag.
At this time, it can be formed such that the shape in front view facing the first surface is a petal shape.

[0011] The airbag of the present invention (claim 4) has a first surface facing the occupant, and a second surface facing the first surface. In the airbag having a chamber into which gas is introduced between the first surface and the second surface, portions other than the peripheral portions of the first surface and the second surface are partially connected to reduce the volume of the chamber. It is characterized by having done.

In such an arrangement, in the airbag of the present invention, the first surface and the second surface are partially connected at portions other than the peripheral portion, and these portions are inflated when the airbag is inflated. Since the airbag cannot be separated, the inflation of the airbag is restricted and the volume of the chamber inside the airbag becomes small. Therefore, a low-output inflator is used as in the case of the above-described (claim 1). Even in such a case, the deployment can be completed quickly and the deployment can be completed, and there is no need to provide a restricting means such as a separate strap, so that it is possible to manufacture easily and at low cost.

Further, the airbag according to the present invention (Claim 5) has a first surface facing the occupant, and a second surface facing the first surface. An airbag having a chamber into which gas is introduced between the airbag and the second surface, wherein one end and the other end of the airbag are connected by a connecting piece in order to reduce the volume of the chamber when inflated. And
The length of the connecting piece is smaller than the length from the one end to the other end of the first surface when not inflated.

In the airbag constructed as described above, one end and the other end are connected by a connecting piece having a length shorter than the length between them when not inflated. The expansion of the side is restricted, and the internal chamber volume is small. Thus, at the time of inflation, deployment can be completed very quickly even with a low-output inflator, similarly to the airbags of the above-described configurations.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of an airbag for a driver's seat of an automobile as an airbag according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the airbag, and FIG. It is a front view.

This driver's seat airbag 1 has a front panel 2 facing an occupant and a rear panel 3 facing the front panel 2 overlapped, and these peripheral portions are joined by means of sewing thread 4, adhesive, welding or the like. Are combined by

As shown in FIG. 2, each of the front panel 2 and the rear panel 3 has a total of four concave portions 5 each having a shape in which the peripheral edge is curved from four sides toward the center. It has a point-symmetrical petal-like appearance with the center point of the panel as the point of symmetry, and
In FIG. 3, it has a size that is inscribed in the periphery of a circular front panel and a peripheral edge of a rear panel constituting a normal circular driver airbag indicated by a two-dot chain line. In other words, the front panel 2 and the rear panel 3 were formed with concave portions 5 by depressing, at the peripheral edge thereof, positions that are equally divided into four parts in the circumferential direction with respect to the circular front panel and the rear panel toward the center of each panel. It has a shape.

The airbag 1 constructed by stacking the front panel 2 and the rear panel 3 and joining the peripheral edges of the front panel 2 and the rear panel 3 has a shape obtained by constricting the above-mentioned ordinary circular airbag from all sides. The volume of the internal chamber is smaller than that of the normal airbag.

The rear panel 3 is provided with an inflator opening 6 near the center thereof. Around the opening 6, bolts or rivets for fixing the airbag 1 to a retainer (not shown) are provided. An insertion hole 7 through which (not shown) is inserted is arranged. Also, this rear panel 3
Is provided with a vent hole 8 for preventing the gas in the airbag from flowing out when the occupant enters the airbag 1 to prevent the internal pressure of the airbag from excessively increasing.

The airbag 1 constructed as described above is connected to a retainer by a holding ring (not shown). A stud bolt (not shown) protrudes from the holding ring. The stud bolt is inserted through an insertion hole 7 provided in the airbag 1 and an opening (not shown) provided in the retainer, and a nut is screwed into the stud bolt.
The airbag 1 is connected to the retainer. The retainer to which the airbag 1 is connected is also connected to an inflator (not shown) for generating a gas for inflating the airbag, and gas from the inflator is supplied to the airbag 1 through the opening 6. It is configured to be introduced into. Then, the airbag 1 is folded, and a module cover (not shown) is provided so as to cover the airbag 1.
After the airbag 1 is attached, the airbag device (not shown) including the airbag 1 is disposed inside a steering wheel (not shown) of the automobile.

In an airbag device provided with the airbag 1, in an emergency such as a vehicle collision, the inflator operates to inject gas to inflate the airbag 1, and the module cover is opened with the inflation of the airbag 1. Then, the airbag 1 is deployed in the vehicle compartment to receive the occupant. At this time, since the volume of the chamber inside the airbag 1 is smaller than that of the ordinary circular airbag described above, even if the output of the inflator for inflating the airbag 1 is low, it is sufficient. It is possible to complete the deployment quickly.

In the airbag 1, the deployment shape of the airbag itself is regulated by providing a concave portion 5 in each of the panels 2 and 3, and the airbag 1 is separately regulated by a tear seam, a strap, an adhesive and the like. There is no need to provide any means, and the configuration of the airbag 1 and the manufacturing process thereof are not significantly different from ordinary airbags. Therefore,
According to the airbag 1, it is possible to easily and inexpensively manufacture an airbag whose deployment shape is regulated so as to expand rapidly even when a low-output inflator is used.

In this embodiment, the airbag 1 has four recesses 5 at the peripheral edge thereof at four positions in the circumferential direction, but the number and arrangement of the recesses are not limited to this. Instead, for example, the configuration shown in FIGS. 4 to 6 may be adopted according to the use of the airbag 1 or the configuration of the airbag device including the airbag 1. 4 to 6 are front views of the airbags 1A to 1C. For comparison, in each figure, a normal circular airbag is indicated by a two-dot chain line as in FIG.

In FIG. 4, the airbag 1A has three concave portions 5, and each concave portion 5 defines a peripheral portion of the airbag 1 by three.
They are provided at equally dividing positions.

In FIG. 5, the airbag 1B has two concave portions 5, and each concave portion 5 is provided at a position diametrically opposed to a peripheral edge portion of the airbag 1.

In FIG. 5, the airbag 1C is provided with one recess 5 in the upper peripheral portion.

In each of the above embodiments, the airbag is configured as an airbag for a driver's seat of an automobile.
It can be applied to various uses such as side protection, and may be installed in various vehicles other than automobiles, playground equipment, and the like.

In the above embodiment, the front panel 2 and the rear panel 3 each have a shape in which at least a part of the peripheral edge is curved toward the inside of each panel. The concave portions 5 are formed by joining the peripheral portions of the panels 2 and 3 having a shape.
Is formed to reduce the volume of the chamber inside the airbag, but the concave portion provided in the airbag may be formed by another configuration.

For example, the airbags 100, 100A to 100C for the driver's seat of the automobile shown in FIGS. 20 to 24 are similar to the normal airbags for the driver's seat. Are joined by a joining means such as a sewing thread 103 or an adhesive or a welding, and a locus of a joining portion of each panel by the sewing thread 103 or the like is at least partially adjacent to a peripheral portion of each panel. The airbag 100 is inserted into the center of the airbag with respect to a line connecting the other connecting portions, thereby forming a recess 104 for reducing the volume of the chamber inside the airbag 100 as compared with a normal airbag. Is formed.

FIG. 20 shows this airbag 100.
FIG. 21 is a perspective view of the airbag 100, and FIGS. 22 to 24 are front views showing another example of the airbag.

Referring to FIGS.
0 represents a total of four recesses 10 at positions that divide the peripheral edge into four equal parts.
4 is provided. The airbag 100 has an inflator opening 105 near the center of the rear panel 102, and around this opening 105, bolts or rivets for fixing the airbag 100 to a retainer (not shown) are inserted. Insertion hole 106 is provided. Further, the retainer 102 is provided with a vent hole 107 for preventing the internal pressure of the airbag from excessively increasing when the airbag is inflated.

In FIG. 22, the airbag 100A
Has a total of three recesses 104 formed therein, and each recess 1
04 are arranged on the upper half of the airbag 100A and on the lower half sides of the left and right sides.

In FIG. 23, the airbag 100B
Has concave portions 104 formed on both left and right sides.

In FIG. 24, the airbag 100C
Has one recess only on the upper side.

In any of the airbags 100, 100A to 100C thus configured, the volume of the internal chamber when inflated is smaller than that of a normal driver's seat airbag having no recess. , 100A-1
Even if the output of the inflator for expanding 00C is low, the deployment can be completed sufficiently quickly. Further, the airbags 100, 100A to 100C can be constituted by a front panel and a rear panel similar to those used for a normal driver's seat airbag. In this case, the peripheral portions of the panels are connected to each other. By injecting at least a part of the connected portion into the center of the airbag with respect to a line connecting the adjacent connected portions, it is possible to easily and inexpensively manufacture an airbag having the above-described effects. .

The airbags 100, 100A-
Although 100C is configured as an airbag for a driver's seat of an automobile, it can be configured as another airbag for protecting a human body in the present embodiment as in the above-described embodiment. For example, the airbag 1 shown in FIGS.
10 shows an application example of the airbag of the present embodiment to a passenger airbag, and FIG.
FIG. 26 is a perspective view of the airbag 110. FIG.

In the airbag 110, a substantially rectangular front panel 111 and a rear panel 112 are superimposed on each other, and their peripheral edges are joined to each other by means of joining means such as sewing threads 113, adhesion, welding and the like. In the vicinity of the center of the rear panel 112, an opening 115 for introducing gas from an inflator (not shown) into the inside of the airbag is connected to an opening in a front portion of a container (not shown) for accommodating the airbag 110. Is provided. Further, the rear panel 112 is provided with a vent hole 116 for preventing the internal pressure of the airbag from excessively increasing when the airbag is inflated.

On the left and right sides of the airbag 110, there are provided recesses 114 formed in the same manner as the recesses 104 of the airbag 100 described above. Thus, the airbag 110 has a relatively small volume in the inner chamber. Of course, also in this airbag 110, the number and arrangement of the concave portions 114 are not limited to this.

In the above-described embodiment, the concave portion provided in each airbag has a curved front view in which the peripheral portion of the airbag is curved so as to enter the center of the airbag. The shape of the concave portion is not limited to such a curved shape, but may be a linear shape or another geometric shape. For example, in the airbag 120 shown in FIG. 27, the joints formed by joining the peripheries of the circular front panel 101 and the rear panel 102 to each other are formed in the upper half portions of both sides of the airbag 120 at the peripheries of the panels. By drawing a chord-like trajectory connecting two points, and drawing a substantially L-shaped trajectory that enters the center of the airbag from the peripheral edge of each panel in the lower half, the chordal concave portion 121 has a chordal shape in front view, Similarly, the front view shape is approximately L
A letter-shaped recess 122 is formed. The other configuration of the airbag 120 is the same as that of the airbag 100 described above, and the same reference numerals denote the same parts.

Next, an airbag according to another embodiment of the present invention will be described with reference to FIGS.

FIG. 7 is a perspective view of an airbag for a driver's seat as an airbag according to another embodiment of the present invention, FIG. 8 is a front view of the airbag, and FIGS. It is sectional drawing which follows the IX-IX line and XX line of the figure.

The driver's seat airbag 10 shown in FIGS. 7 to 10 has a circular front panel 11 and a circular rear panel 12 which are overlapped with each other, as in a normal driver's seat airbag. These are joined by joining means such as suturing, adhesion, welding and the like.

A sewing thread 13 is sewn on the airbag 10 in a straight line from the periphery to the vicinity of the center and over a predetermined length. The sewing thread 13 joins portions of the front panel 11 and the rear panel 12 other than the peripheral edge to each other, and prevents the front panel 11 and the rear panel 12 from separating from each other when the airbag 10 is inflated. An inflation restricting portion 14 is formed to restrict the inflation of the airbag 10 and reduce the volume of the chamber inside the airbag. The airbag 10 is provided with a total of four linear inflation restricting portions 14 at positions that divide the peripheral edge into four equal parts in the circumferential direction.

The rear panel 12 is provided with an inflator opening 15 near the center thereof. Around the opening 15, an airbag 10 is provided with a retainer (not shown).
An insertion hole 16 through which a bolt or a rivet (not shown) for fixing to the head is inserted is disposed. Further, the rear panel 12 is provided with a vent hole 17 for preventing gas from flowing out of the airbag and preventing the internal pressure of the airbag from excessively rising when an occupant enters the airbag 10. .

In an airbag apparatus (not shown) provided with the airbag 10 configured as described above, when the inflator (not shown) operates to eject gas to inflate the airbag 10, the airbag 10 is inflated. As shown in FIGS. 9 and 10, the expansion restricting portion 14 controls the front panel 11.
The rear panel 12 and the rear panel 12 are partially connected to each other so that they cannot be separated from each other, so that the volume of the internal chamber is smaller than that of a normal airbag. As a result, even in the airbag apparatus provided with the airbag 10, the airbag 1 is sufficiently quickly operated by the low-output inflator.
It is possible to complete the development of 0. In addition, when the airbag 10 is inflated, the inflation restricting portion 14 for restricting the inflation of the airbag 10 in order to reduce the volume of the chamber in the airbag is partially provided at a portion other than the peripheral portion of the airbag 10. Front panel 11 and rear panel 12
Is very simple in that the airbag 10 is connected with the sewing thread 13 or the like, and such an airbag 10 can be easily and inexpensively manufactured.

In this embodiment, the expansion restricting portion 14
Is a sewing thread 13 sewn linearly from the peripheral edge of the airbag 10 to the vicinity of the center and over a predetermined length so as to connect the front panel 11 and the rear panel 12.
However, the configuration of the expansion restricting portion 14 is not limited to this. For example, this expansion restricting portion 1
4 may be formed by partially joining the front panel 11 and the rear panel 12 by joining means such as adhesion or welding.

Further, as shown in FIGS. 13 to 15, the inflation restricting portion 14 has a plurality of (four in this embodiment) sewing threads around the center of the airbag 10A. 13 may be sewn, and the front panel 11 and the rear panel 12 may be joined in a spot shape to restrict the inflation of the airbag 10A.
As in an airbag 10B shown in FIGS. 6 to 18, a series (four in this embodiment) of substantially circular arc shape may be used to open around the center of the airbag 10B in a disconnected manner. Further, like the airbag 10C shown in FIG. 19, the inflation restricting portion 14 may have a concave shape that enters from the peripheral portion of the airbag 10C toward the center of the airbag 10C. 13, 16, and 19 are front views showing a modification of the airbag 10, and FIGS. 14 and 15 are sectional views taken along lines XIV-XIV and XV-XV in FIG. 13, respectively. , 18 are respectively XVII-XV of FIG.
It is sectional drawing which follows the II line and the XVIII-XVIII line.

The airbags 10, 10A to 10A
C is configured as an airbag for a driver's seat and includes four inflation restricting portions. However, the airbag of this embodiment may be configured as another airbag for protecting a human body. The number and arrangement of the regulating portions are not limited to those described above. For example, the airbag 20 shown in FIGS. 11 and 12 is configured as a passenger-seat airbag having a substantially rectangular shape in a plan view, and has a total of six straight lines from the periphery to the vicinity of the center. Is provided.

In this airbag 20, a substantially rectangular front panel 20a and a rear panel 20b are overlapped,
It is configured by joining the peripheral edges by joining means such as stitching, adhesion, welding and the like. An opening 20c near the center of the rear panel 20b is connected to an opening in a front portion of a container (not shown) for accommodating the airbag 20, and introduces gas from an inflator (not shown) into the inside of the airbag. Is provided. The rear panel 20b has a vent hole 2 for preventing the internal pressure of the airbag from excessively increasing when the airbag is inflated.
0d is provided.

Each inflation restricting portion 21 is provided with the airbag 20.
Are formed by sewing threads 22 sewn linearly so as to join the front panel 20a and the rear panel 20b over a predetermined length from the peripheral edge of the airbag 20 to the vicinity of the center at both sides and each corner. As a result, similar to the airbag 20 described above, the airbag 2
0 indicates that the volume of the chamber at the time of expansion is small.

Next, still another embodiment of the airbag according to the present invention will be described with reference to FIGS.
FIG. 28 is an exploded perspective view showing the configuration of the driver's seat airbag according to the embodiment, and FIG. 29 is a perspective view of the airbag when inflated.

The driver seat airbag 200 has a circular front panel 202 and a circular rear panel 20.
4 and sew or glue these peripheral edges together.
They are joined by joining means such as welding. The rear panel 204 is provided with an inflator opening 206 near the center thereof. Around the opening 206, a bolt or rivet (not shown) for fixing the airbag 200 to a retainer (not shown) is provided. ) Are inserted. Further, the rear panel 204 is provided with a vent hole 210 for preventing gas in the airbag from flowing out when the occupant enters the airbag 200 and preventing the airbag internal pressure from excessively increasing. .

In the interior of the airbag 200, there is provided a connecting piece 220 for connecting the opposing portions of the peripheral portion of the airbag 200 to each other.

The connecting piece 220 has four arm portions 222a to 222d radially extending in a direction orthogonal to each other, and the tips of the arm portions 222 are respectively set at four sides from the peripheral edge of the rear panel 204. Ear-shaped projection 21 that overhangs
2 are connected. (Hereinafter, the tip of each arm 220 may be referred to as the “joining end” of the joining piece 220.) The ear-like projection 212 divides the peripheral edge of the rear panel 204 into four equal parts in the circumferential direction. The airbag 200 is provided at each position.
It is arranged to be exposed inside the chamber.

As shown in the figure, in the coupling piece 220, the arm 222a and the arm 222c extend in the direction away from each other, and the remaining arm 222b and the arm 2
22d also extend in the direction away from each other, and couple the opposing protruding pieces 212 on the peripheral edge of the rear panel 204 to each other. In addition, the length between the tip of the arm 222a and the tip of the arm 222c and the length of the arm 222b
The length between the front end of the arm-shaped portion 222d and the front end of the arm-shaped portion 222d is determined by
It is shorter than the length between two by a predetermined length.

For this reason, the opposing portions of the peripheral portion of the airbag 200 joined to each other by the connecting piece 220 via the opposing projecting pieces 212 are connected to the connecting piece 2.
20 restricts lateral expansion of the airbag when it is drawn into the airbag chamber.

The airbag 200 constructed as described above
Since the two sets of opposing peripheral edges are restricted from expanding by the coupling piece 220, the second
As shown in FIG. 9, the peripheral portion is developed into a shape narrowed from four sides in the airbag centripetal direction. Therefore, the volume of the chamber at the time of inflation is smaller than that of a normal circular airbag, and the deployment is completed sufficiently quickly even with a low-output inflator.

Although not shown, the coupling piece 220 may be provided with a vent hole for ensuring the flow and circulation of the gas ejected from the inflator inside the airbag 200 when the airbag is inflated. . The configuration of the ventilation hole may be any as long as the coupling state between the opposing portions of the peripheral portion of the airbag by the coupling pieces is not impaired.

In the present embodiment, the airbag 200
Is configured as an airbag for a driver's seat of an automobile, but may be configured as an airbag for a passenger's seat of an automobile or another airbag for protecting a human body.

In the interior of the airbag 200, an ear-shaped projection 212 extending from the peripheral edge of the airbag 200 is provided.
Alternatively, the configuration of the coupling piece 220 that couples the opposing projecting pieces 212 to each other and restricts expansion of the same edge of the airbag during inflation to reduce the volume of the chamber may be other than the above. Good. For example, in the airbag 200A shown in FIG. 30, each pair of the opposed protruding pieces 212 is connected to each other by an elongated strip-shaped connecting piece 220A. In the airbag 200B shown in FIG. 31, the connecting piece 20B has an arm-shaped portion 222a extending radially in three directions.
′ To 222 c ′, and the arm pieces 222 a ′ to 222 c ′ are arranged at positions that divide the periphery of the rear panel 204 into three equal parts in the circumferential direction. , And each of the protrusions 212 is drawn in the centripetal direction of the airbag 200B to reduce the capacity of the chamber. 30 and 31 show the airbag 2 according to the embodiment.
00A and 200B are exploded perspective views, in each of which a second
8 and 29 indicate the same parts.

Further, these airbags 200, 20
0A and 200B, the peripheral portion thereof and the connecting piece 2
The coupling structure of the coupling piece 20 (or the coupling piece 220A or the coupling piece 220B) to the coupling end may have a configuration other than the above. For example, although not shown, the peripheral portion of the airbag is coupled to the coupling end of the coupling piece. When the airbag is constructed, the connecting end of the connecting piece is connected to each panel 202,
The airbag and the connecting end of the connecting piece may be connected by sandwiching between the peripheral portions of the connecting member 204 and connecting the three together by connecting means such as sewing.

[0063]

As described in detail above, according to the airbag of the present invention, even when a low-output inflator is used as a gas generating source for inflating the airbag, a regulating means such as a separate strap is provided on the airbag. Thus, it is possible to easily and inexpensively manufacture an airbag capable of completing deployment immediately without providing the airbag.

[Brief description of the drawings]

FIG. 1 is a perspective view of an airbag 1 according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing the configuration of the airbag of FIG.

FIG. 3 is a front view of the airbag of FIG.

FIG. 4 is a front view of an airbag 1A according to the embodiment.

FIG. 5 is a front view of an airbag 1B according to the embodiment.

FIG. 6 is a front view of an airbag 1C according to the embodiment.

FIG. 7 shows an airbag 10 according to another embodiment of the present invention.
It is a perspective view of.

FIG. 8 is a front view of the airbag of FIG. 7;

FIG. 9 is a sectional view taken along the line IX-IX in FIG. 8;

FIG. 10 is a sectional view taken along line XX of FIG. 8;

FIG. 11 is a perspective view of an airbag 20 according to the embodiment.

FIG. 12 is a front view of the airbag shown in FIG. 11;

FIG. 13 is a perspective view of an airbag 10A according to the embodiment.

14 is a sectional view taken along the line XIV-XIV in FIG.

FIG. 15 is a sectional view taken along lines XV-XV in FIG. 13;

FIG. 16 is a perspective view of an airbag 10B according to the embodiment.

FIG. 17 is a sectional view taken along lines XVII-XVII in FIG. 16;

FIG. 18 is a sectional view taken along lines XVIII-XVIII in FIG. 16;

FIG. 19 is a perspective view of an airbag 10C according to the embodiment.

FIG. 20 is an airbag 1 showing another embodiment of the present invention.
00 is a front view of FIG.

FIG. 21 is a perspective view of the airbag of FIG. 20;

FIG. 22 is a front view showing an airbag 100A according to the embodiment.

FIG. 23 is a front view showing an airbag 100B according to the embodiment.

FIG. 24 is a front view showing an airbag 100C according to the embodiment.

FIG. 25 is a front view showing an airbag 110 according to the embodiment.

FIG. 26 is a perspective view of the airbag of FIG. 25.

FIG. 27 is a front view showing an airbag 120 according to the embodiment.

FIG. 28 is an exploded perspective view of an airbag 200 according to still another embodiment of the present invention.

FIG. 29 is a perspective view of the airbag 200 of FIG. 28.

FIG. 30 is an exploded perspective view of an airbag 200A according to the embodiment.

FIG. 31 is an exploded perspective view of an airbag 200B according to the embodiment.

[Explanation of symbols]

1,1A, 1B, 1C, 10,10A, 10B, 10
C, 20, 100, 100A, 100B, 100C, 1
10, 120, 200, 200A, 200B Airbag 5, 104, 114, 121, 122 Concave part 14, 21 Inflation regulating part 220, 220A, 220B Connection piece

Continued on the front page (72) Inventor Kenji Fujibayashi F-term (reference) 3D054 AA02 AA03 AA04 BB23 CC04 CC06 CC15 CC47 FF17 1-4-30 Roppongi, Minato-ku, Tokyo

Claims (5)

[Claims] A first surface facing the occupant; and a second surface facing the first surface, wherein gas is introduced between the first surface and the second surface. A part of the periphery of the airbag is a concave portion that enters the center of the airbag with respect to a line connecting the parts adjacent to each other in the peripheral direction of the airbag. An airbag characterized by the following. 2. The airbag according to claim 1, wherein a plurality of the recesses are provided in a peripheral direction of the airbag. 3. The airbag according to claim 2, wherein the shape in front view facing the first surface is a petal shape. 4. A first surface facing the occupant, and a second surface facing the first surface, wherein gas is introduced between the first surface and the second surface. An airbag having a chamber having an airbag, wherein portions of the first surface and the second surface other than peripheral portions are partially connected in order to reduce the volume of the chamber. 5. A vehicle having a first surface facing an occupant, and a second surface facing the first surface, wherein gas is introduced between the first surface and the second surface. An airbag having one end and the other end connected by a connecting piece in order to reduce the volume of the chamber when inflated, wherein the length of the connecting piece is An airbag, wherein a length of the first surface from the one end to the other end when not inflated is smaller.