Inflator for air bag device
First Claim
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1. An inflator of an air bag device adapted to inflate an air bag, comprising:
- a metallic casing with a wall portion,a propellant filled in said casing for generating gas,an igniter situated inside the casing adjacent to the propellant, said igniter starting a gas generating reaction of the propellant when the igniter is actuated, andgas discharge means provided in the wall portion of the casing and integrally formed with the wall portion of the casing as one unit to completely seal the casing, said gas discharge means including first recessed portions with first metallic films to be able to communicate with the air bag, and second recessed portions with second metallic films situated at a side opposite to the first recessed portions, each of said first metallic films having a thickness less than a thickness of each of the second metallic films so that when the igniter is actuated upon collision of a vehicle, the first metallic films break to inflate the air bag, and when the propellant is ignited by heat due to a fire, the first and second metallic films break to prevent thrust from being formed by gases ejected from the first and second recessed portions.
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Accused Products
Abstract
A casing has a casing body and an end plate and has propellant filled inside thereof. Gas discharge holes are provided to recess from an outer surface of the casing body and are sealed by a film. The film is molded integrally with the casing body.
14 Citations
10 Claims
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1. An inflator of an air bag device adapted to inflate an air bag, comprising:
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a metallic casing with a wall portion, a propellant filled in said casing for generating gas, an igniter situated inside the casing adjacent to the propellant, said igniter starting a gas generating reaction of the propellant when the igniter is actuated, and gas discharge means provided in the wall portion of the casing and integrally formed with the wall portion of the casing as one unit to completely seal the casing, said gas discharge means including first recessed portions with first metallic films to be able to communicate with the air bag, and second recessed portions with second metallic films situated at a side opposite to the first recessed portions, each of said first metallic films having a thickness less than a thickness of each of the second metallic films so that when the igniter is actuated upon collision of a vehicle, the first metallic films break to inflate the air bag, and when the propellant is ignited by heat due to a fire, the first and second metallic films break to prevent thrust from being formed by gases ejected from the first and second recessed portions. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An inflator of an air bag device adapted to inflate an air bag, comprising:
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a metallic casing with a wall portion, said wall portion having inner and outer surfaces, a propellant filled in said casing for generating gas, an igniter situated inside the casing adjacent to the propellant, said igniter starting a gas generating reaction of the propellant when the igniter is actuated, and gas discharge means provided in the wall portion of the casing and integrally formed with the wall portion of the casing as one unit to completely seal the casing, said gas discharge means including cylindrical recessed portions with metallic films to be able to communicate with the air bag, each of said recessed portions extending from at least one of the inner and outer surfaces toward the other of the inner and outer surfaces, each metallic film having a groove therein extending across a full length of each metallic film and indented from a side of each recessed portion so that when the igniter is actuated upon collision of a vehicle, the metallic films are torn along the grooves to inflate the air bag. - View Dependent Claims (8, 9, 10)
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Specification