the present invention relates to a gas generator device used in automobile safety to inflate an airbag . this device is characterized in that it comprises at least one gas source for inflating the airbag and at least one gas outlet orifice , called the first orifice , for gas to flow into the airbag , characterized in that it includes means for making the gas pass through other gas outlet orifices , called second orifices , which are distributed over the device so that it is given a neutral - thrust configuration when it is initiated , although not in service , the device also including means for closing off these second orifices when the device is in service , so that when the device is initiated , the gas passes via the first outlet orifice .