Patent ID: 7556289

Claim:
A gas generator for an air bag, comprising: a housing having a gas discharge port, a first combustion chamber and a second combustion chamber, provided inside the housing and charged with a gas generating agent, a first ignition device and a second ignition device provided in the two combustion chambers, respectively, the second ignition device provided with an electric igniter, a piston, an enhancer agent, a detonator provided in the enhancer agent, opposite to the distal end of the piston, and a tether being externally tied around an air bag accommodated into an air bag module, and one end of the tether being connected to the piston, the tether controlling an inflation direction of the air bag by fastening the inflating air bag when the first ignition device is activated, the tether being configured to be released from the piston by movement of the piston when the second ignition device is activated.