| abstract |
A low temperature gas generator for inflation of gas bags, particularly useful for passenger restraint in an automobile is provided. An oxidation-reduction pyrotechnic gas producing mixture is hermetically sealed in a chamber prior to initiation, and is ignited by a bridge wire initiator. The pyrotechnic mixture produces a gas comprising principally carbon dioxide and water vapor. Vaporized salts may also be present. These hot gases flow through an array of wires for sound muffling and flame arresting, through a relatively unobstructed passage to a relatively large outlet and into a gas bag for inflation in a very short time interval. Means are provided for inhibiting gas flow rates to less than sonic velocity. Subsequent deflation of the bag occurs upon condensation of water vapor and contraction of carbon dioxide. If desired an aspirator may draw ambient air into the bag with the combustion gases, and when used the aspirator permits reverse flow, giving additional means for deflating the bag. Means are provided for controlling the rate of gas generation and gas temperature for controlled bag deployment and pressurization. A piezoelectric device is provided for firing the bridge wire initiator. |