Patent ID: 6755439
Filing Date: 2004-06-29
Classification: B60R,F16K

Abstract:
An inflator comprising:a bottle provided with an opening, to be charged with a high-pressure gas; a sealing plate for sealing the bottle at the opening thereof; an initiator for generating a gas blast as a motive force to break the sealing plate; and a piston including a cutting edge for breaking the sealing plate, the piston accelerating with the gas blast of the initiator, wherein the sealing plate swells toward the piston due to the pressure of the high-pressure gas; wherein the cutting edge of the piston comes into contact with a portion of the sealing plate offset from the vertex of the swell of the sealing plate; and wherein the cutting edge is provided with a tapered face formed at the side away from the vertex of the sealing plate side of the cutting edge; wherein the piston is arranged so that an angle between the tapered face and a line disposed on a longitudinal axis of the piston is less an acute angle between a line normal to the sealing plate at a contact point between the cutting edge and the sealing plate and the line disposed on the longitudinal axis of the piston.