Patent ID: 7762584

Claim:
An actuator which has an operating pin, which has the following structure: the actuator includes a piston which has an operating pin, a squib which is ignited then generates a driving gas when the actuator is operated, and a cylinder case for holding the piston; wherein the piston is connected to the squib and its operating pin projects from its front end; wherein the cylinder case includes a side wall portion substantially in a cylindrical shape surrounding the piston, and a ceiling wall portion that closes the front end side of the side wall portion but also allows the operating pin to project outward; wherein the piston is configured so that it is moved rearward along with its operating pin by the driving gas generated from the squib and injected into the cylinder case when the actuator is operated; wherein the piston comprises a cap portion capable of covering the side of the squib where the squib has a gas injection port; wherein the cap portion comprises a cylindrical side portion capable of covering the sides of the squib in all directions orthogonal to the axis of the squib, and a front end wall portion formed to close the front end side of the cylindrical side portion; wherein the operating pin which is configured to have a diameter smaller than the outer diameter of the front end wall portion is made to project from the center of the front end wall portion of the cylindrical case; wherein a plurality of injection holes capable of injecting the driving gas from the gas injection port to the space between the front end wall portion and the ceiling wall portion inside of the cylinder case are provided in the cap portion around the operating pin; and wherein the forward movement of the piston before the actuator is operated is restricted by the front end wall portion of the piston coming into contact with the ceiling wall portion of the cylinder case.