Patent ID: 7172214

Claim:
A gas generator for an air bag, comprising: a housing having a gas discharge port; an ignition means chamber accommodating therein ignition means activated by an impact; a combustion chamber accommodating therein a gas generating agent ignited and burnt to generate a combustion gas; a cylindrical filter disposed between the combustion chamber and the gas discharge port, in which the combustion gas passes through the filter and is discharged from the gas discharge port; and an inner cylindrical shielding plate disposed inside the cylindrical filter, wherein, the inner cylindrical shielding plate is disposed such that its lower end opening peripheral edge is in contact with a housing bottom surface and defines an opening between an upper end of the inner cylindrical shielding plate and a ceiling of the housing that allows the combustion gas to flow from the combustion chamber to the cylindrical filter, and a gap is provided between an inner peripheral surface of the cylindrical filter and an outer peripheral surface of the inner cylindrical shielding plate.