Patent ID: 6948737
Filing Date: 2005-09-27
Classification: B60R

Abstract:
1. A gas generator for an air bag, comprising: a housing having a plurality of gas generating ports closed by a seal tape, the ports including a first port adapted to be opened by rupturing the seal tape and a second port adapted to be opened by rupturing the seal tape; a first combustion chamber and a second combustion chamber provided inside the housing; gas generating agents accommodated inside the first combustion chamber and the second combustion chamber, each gas generating agent being cylindrical in shape having at least a single hole in the longitudinal direction thereof, and a ratio L/d of an inner diameter (d) and a length (L) of the holes being L/d>3.5; a first stage igniter for igniting and burning gas generating agents accommodated in the first combustion chamber, the first stage igniter being adapted to rupture the seal tape covering the first port; a second stage igniter for igniting and burning gas generating agents accommodated in the second combustion chamber and being adapted to rupture only the seal tape covering the second port, the second stage igniter being adapted to be ignited with a time-lag, wherein when the first-stage igniter is ignited, a portion of the seal tape is first ruptured and another part of or all of the unruptured seal tape is ruptured with a delay, and a ratio (P