Abstract: The inflator assembly comprises a cylindrical housing main body which is made by extrusion so that it is possible to achieve a desired cross section which optimizes the progress of combustion of the propellant while minimizing the size of the housing. In particular, by using a member clad or mounted with brazing material for an internal component of the assembly, such as the ignition pipe, a leg section for supporting the ignition pipe inside the housing, a wall section for defining a separate combustion chamber, at least one of the end plates for closing the axial ends of the housing main body, and a perforated plate member serving as the perforated section, it is possible to simplify the manufacturing process, and thereby reduce the manufacturing cost.

Abstract: After the pressure of the gas in a first chamber reaches the maximum value, the cover for the air bag is broken up. The cover is broken at the pressure of the maximum value, and there is almost no waste of the gas energy. Thus, the cover can be broken up by the small amount of the gas energy and the heat losses are extremely reduced, so that the amount of the gas generating agents are made small. Also, the cover is broken by the burning of the first chamber and the air bag is inflated at the first stage by expansion and inertia of the gas. There is provided a mechanical timing for ignition delay, and then the bag is fully inflated by the burning of a second chamber. Therefore, the bag can be desirably inflated.

Abstract: The inflator assembly comprises a cylindrical housing main body which is made by extrusion so that it is possible to achieve a desired cross section which optimizes the progress of combustion of the propellant while minimizing the size of the housing. In particular, by using a member clad or mounted with brazing material for an internal component of the assembly, such as the ignition pipe, a leg section for supporting the ignition pipe inside the housing, a wall section for defining a separate combustion chamber, at least one of the end plates for closing the axial ends of the housing main body, and a perforated plate member serving as the perforated section, it is possible to simplify the manufacturing process, and thereby reduce the manufacturing cost.