Patent ID: 7134689

Claim:
An inflator, comprising: a pressurized medium chamber defined by an outer shell formed of a cylindrical pressurized medium chamber housing and charged with a pressurized medium; a gas generator connected to one end of the pressurized medium chamber and including ignition means and a gas generating agent accommodated in a gas generator housing; a diffuser portion connected to the other end of the pressurized medium chamber; a first rupturable plate that closes a first opening between the pressurized medium chamber and the gas generator; a second rupturable plate that closes a second opening between the pressurized medium chamber and the diffuser portion; a cap having a gas ejecting hole for ejecting combustion gas generated by the gas generating agent only in a radial direction and then forcing the ejected combustion gas to flow along a longitudinal direction of the pressurized medium chamber, the cap covering the first rupturable plate from the pressurized medium chamber side, wherein at least one selected from the following requirements (a), (b), and (c) is provided, (a) an inner wall surface of the pressurized medium chamber housing is rough, (b) the gas ejecting hole is oriented such that combustion gas ejected from the gas ejecting hole does not strike against an inner wall surface of the pressurized medium chamber housing; and (c) a barrier member is disposed in the vicinity of the gas ejecting hole, and combustion gas ejected from the gas ejecting hole moves after the combustion gas strikes against the barrier member.