Patent ID: 8015906

Claim:
An actuator with an actuating pin comprising: a piston having an actuating pin; a squib which is ignited during actuation to be capable of generating a driving gas; and a cylinder case holding the piston, wherein the piston is configured to make the actuating pin protrude from a leading end thereof, the cylinder case has a substantially tubular peripheral wall part that covers a circumference of the piston, and a ceiling wall part which has a through hole which allows the actuating pin to protrude therethrough, the ceiling wall part blocks up a leading end side of the peripheral wall part, during actuation of the actuator with the actuating pin, the driving gas generated from the squib is ejected to a space between the ceiling wall part and the piston in the cylinder case, to make the piston move backward along with the actuating pin, a sealing ring which is relatively movable with respect to the actuating pin while maintaining a state of sealing up a gap between the actuating pin and the through hole, is provided at an inner face side of the ceiling wall part, and a presser plate which is formed to have stiffness higher than that of the sealing ring, the presser plate is relatively movable with respect to the actuating pin, and is capable of regulating a backward movement of the sealing ring when the piston moves backward, is provided at a rear side of the sealing ring.