Patent ID: 7052040

Claim:
A gas generator for an air bag comprising a housing having a gas discharge port, first and second ignition means activated by the impact, and first and second combustion chambers accommodating gas generating agents which are ignited and burnt to generate combustion gases, wherein the first ignition means has a first igniter and a first transfer charge inside a first ignition means chamber, and the gas generating agent inside the first combustion chamber is ignited and burnt by ignition energy due to combustion of the first transfer charge inside the first ignition means chamber, the second ignition means has a second igniter and a second transfer charge inside a second ignition means chamber, and the gas generating agent inside the second combustion chamber is ignited and burnt by ignition energy due to combustion of the second transfer charge inside the second ignition means chamber, the first and second igniters are arranged in parallel in the radial direction of the housing, and the first and second combustion chambers are arranged concentrically inside the housing, and advancing directions of flames produced when the first and second igniters are activated are not exactly opposite to communication holes for guiding ignition energies produced from the first and second ignition means chambers to the first and second combustion chambers.