Patent ID: 8302992

Claim:
A gas generator, comprising: a tubular housing, an ignition device attached to one end of the tubular housing, a diffuser portion having a gas discharge port and being attached to the other end of the tubular housing, in the tubular housing, a first combustion chamber defined by a first perforated-plate member on one end side in the tubular housing and filled with a first gas generating agent, a tubular member disposed in the remaining inner space of the tubular housing and having a communication hole on a peripheral wall portion thereof, a second-perforated plate member disposed between the first perforated-plate member and the tubular member, a second combustion chamber defined by the tubular member and filled with a second gas generating agent, the tubular member being disposed so that a gap is formed between the peripheral wall portion of the tubular housing and the tubular member, the tubular member having a first opening end portion abutting against the inner peripheral surface of the tubular housing in the side of the first perforated-plate member and a second end portion supported in the side of the diffuser portion.