Abstract: An initiator includes, as constitutive components, a pair of electrodes disposed with an insulator disposed therebetween; a bridge wire connected between the pair of electrodes and adapted to generate heat when energized; an explosive which detonates in response to heat generation of the bridge wire; and a casing that hermetically accommodates the bridge wire and the explosive. The insulator includes a step for enhancing the resistance of the insulator to pressure generated through detonation of the explosive when the insulator receives the thus-generated pressure. The step is formed such that the area of the explosive-side pressure reception surface of the insulator is greater than that of the counter-explosive-side pressure reception surface thereof.

Abstract: An initiator includes, as constitutive components, a pair of electrodes disposed with an insulator disposed therebetween; a bridge wire connected between the pair of electrodes and adapted to generate heat when energized; an explosive which detonates in response to heat generation of the bridge wire; and a casing that hermetically accommodates the bridge wire and the explosive. The insulator includes a step for enhancing the resistance of the insulator to pressure generated through detonation of the explosive when the insulator receives the thus-generated pressure. The step is formed such that the area of the explosive-side pressure reception surface of the insulator is greater than that of the counter-explosive-side pressure reception surface thereof.

Abstract: An air damper has a cylinder member provided at its opposite ends with openings. One opening is formed with a seal surface. A piston member is movable in the cylinder member along an axial direction of the cylinder member so as to generate a variation in pressure in the cylinder member. A cap member is provided on the one opening of the cylinder member. At least a portion of the cap member is capable of moving between a state where the cap member is in contact with the seal surface and a state where the cap member is separated from the seal member in correspondence with the variation in pressure caused by the movement of the piston member. Further, in a state where the cap member is separated from the seal surface, air in the cylinder member can flow out from a space between the cap member and the seal surface.