Patent ID: 7828324

Claim:
A gas generator, in particular for a vehicle occupant restraint system, comprising a pyrotechnical propellant ( 16 ), a combustion chamber ( 12 ) filled with said pyrotechnical propellant ( 16 ), an igniter ( 14 ) associated with said combustion chamber ( 12 ), a first pressure chamber ( 18 ), filled with compressed gas, which is adjacent to said combustion chamber ( 12 ) and has a first opening ( 22 ) remote from said combustion chamber ( 12 ) closed by a first diaphragm ( 26 ), said diaphragm ( 26 ) being destroyed upon activation of said igniter ( 14 ), a second pressure chamber ( 28 ) which is filled with compressed gas and has a second opening ( 34 ) closed by a second diaphragm ( 36 ), said second diaphragm ( 36 ) being likewise destroyed upon activation of said igniter ( 14 ), and said openings ( 22 , 34 ) and the gas volumes of said pressure chambers ( 18 , 28 ) being adapted so that compressed gas flows out from said second pressure chamber ( 28 ) for a longer period than compressed gas from said first pressure chamber ( 18 ) to increase a gas supply time of said gas generator ( 10 ), and a third diaphragm ( 46 ) that separates said first pressure chamber ( 18 ) from said combustion chamber ( 12 ).