| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve the safety of an air bag by defining two combustion chambers at the upper and lower sides of a housing, and providing each combustion chamber with a gas generating agent, a filter member and an ignition device. SOLUTION: First of all, the flame from an ignition device 7 is jetted into an upper combustion chamber 2, whereby the gas generating agent 5 is ignited and burned to generate a high-temperature gas. When the gas pressure reaches a specific pressure, a burst plate 18 is ruptured, and the air bag slowly starts its expansion only by the gas generated from the upper combustion chamber 2. Continuously when an ignition device 8 of a lower combustion chamber 3 is operated, the burning of the gas generating agent 5 in a lower combustion chamber 3 is started, the burst plate 18 is ruptured, and a clean gas is discharged into the air bag. As the result thereof, the air bag slowly starts its expansion by a small amount of gas generated only in the upper combustion chamber 2 in the initial period of the expansion, and then it is rapidly expanded by a large amount of gas generated in the upper and lower combustion chambers 2, 3 after a specific time.</p> |
