Airbag device with inner and outer bags

Details Airbag device with inner and outer bags Airbag device with inner and outer bags

1999-03-11

2001-04-10

Dickson, Paul N. (Department: 3618)

Land vehicles

Wheeled

Attachment

C280S741000, C280S738000

Reexamination Certificate

active

06213496

ABSTRACT:

FIELD OF THE INVENTION AND RELATED ART STATEMENT
The present invention relates to an airbag device installed in a vehicle. More particularly, the present invention relates to an airbag device of a so-called aspiration type, which aspirates air when an airbag is inflated with gas from an inflator.
An airbag device for protecting an occupant during a vehicle collision or roll-over is structured so that an airbag thereof is inflated with gas from an inflator. By designing the device to aspirate air into the airbag during its inflation, the inflating speed of the airbag can be increased. An airbag of such a type which aspirates air during the inflation of the airbag is sometimes called as an aspiration-type airbag.
Most of the aspiration-type airbags for drivers are structured to aspirate air through vent holes formed in the airbags. Some of the aspiration-type airbags for occupants in front passenger seats or rear seats use such vent holes. As one of the aspiration-type airbag devices for occupants in front passenger seats or rear seats, an airbag device, in which air-through openings are formed in a casing for accommodating an airbag, has been proposed.
Because the conventional airbags are designed such that gas from the inflator is supplied therein to fill the entire of the inside volume thereof, an inflator is required to have large capacity of generating gas.
OBJECT AND SUMMARY OF THE INVENTION
It is an object of the present invention to provide an airbag comprising an outer bag and an inner bag in which gas from an inflator is supplied only to a region between the outer bag and the inner bag.
An airbag of the present invention comprises: an outer bag, an inner bag arranged inside said outer bag, and a gas-introduction portion for introducing gas into a space between said outer bag and the inner bag. The inner bag is preferably provided with an opening which allows the ventilation between the inside of the inner bag and the outside of the outer bag.
An airbag device of the present invention has an airbag and an inflator for inflating said airbag wherein said airbag is the above explained airbag.
In the present invention, gas is supplied from the inflator into a space between the outer bag and the inner bag whereby the outer bag is inflated. While the outer bag is being inflated, air is aspirated into the inner bag through the opening thereof so that the inner bag is substantially inflated only with aspirated air.


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patent: 41 26 743 (1993-02-01), None
patent: 197 30 161 (1999-01-01), None

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