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An actuator includes; a cylinder connected to an ignition device; a piston slidably accommodated inside the cylinder, the piston having, in a desired section in the length direction, an enlarged diameter portion in which an outer diameter is enlarged; and a cylindr

An actuator includes; a cylinder connected to an ignition device; a piston slidably accommodated inside the cylinder, the piston having, in a desired section in the length direction, an enlarged diameter portion in which an outer diameter is enlarged; and a cylindrical stopper attached to an inner peripheral surface of the cylinder. The stopper includes, a main body portion fixed to the inner peripheral surface of the cylinder, and a nail portion which inwardly projects from the main body portion and is formed of an elastic material, wherein before activation of the ignition device, the piston is inhibited from moving in an axial direction by causing the nail portion to contact a part of the enlarged diameter portion, and after activation of the ignition device, the piston is inhibited from moving in a backward direction by causing the nail portion to contact another part of the enlarged diameter portion.

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The invention claimed is: 1. An actuator, comprising: a cylinder connected to an ignition device; a piston slidably accommodated inside the cylinder, the piston having, in a desired section in the length direction, an enlarged diameter portion in which an outer diameter is enlarged; and a cylindric

The invention claimed is: 1. An actuator, comprising: a cylinder connected to an ignition device; a piston slidably accommodated inside the cylinder, the piston having, in a desired section in the length direction, an enlarged diameter portion in which an outer diameter is enlarged; and a cylindrical stopper made of an elastic material and attached to an inner peripheral surface of the cylinder, the stopper including, a main body portion fixed to the inner peripheral surface of the cylinder, the main body portion having a slit extending from a first end of the main body to a second end of the main body opposite to the first end, such that an outer peripheral surface of the main body is urged against the inner peripheral surface of the cylinder, and a nail portion inwardly projecting from the main body portion, the nail portion inhibiting the piston from moving in an axial direction prior to an activation of the ignition device by causing the nail portion to contact a part of the enlarged diameter portion, and inhibiting the piston from moving in a backward direction after the activation of the ignition device by causing the nail portion to contact another part of the enlarged diameter portion. 2. The actuator according to claim 1, wherein the nail portion of the cylindrical stopper is formed by cutting out the main body portion, except a part thereof, into a certain shape. 3. An actuator, comprising: a cylinder connected to an ignition device; a piston slidably accommodated inside the cylinder, the piston having a groove formed in an external surface thererof; a cylindrical stopper made of an elastic material and attached to an outer peripheral surface of the piston, the cylindrical stopper including, a main body portion, a nail portion which outwardly projects from the main body portion, the nail portion inhibiting the piston from moving in an axial direction prior to an activation of the ignition device by causing nail portion to contact a peripheral edge of an opening portion of the cylinder, and inhibiting the piston from moving in a backward direction by popping out of the cylinder and spreading wider than a diameter of the opening portion of the cylinder, and a stopper fixing member formed by bending a portion of the main body in an inward direction, such that the cylindrical stopper is fixed to the piston by engaging the stopper fixing member with the groove. 4. The actuator according to claim 3, wherein the nail portion of the cylindrical stopper is formed by cutting out the main body portion, except a part thereof, into a certain shape. 5. The actuator according to claim 1, wherein the ignition device includes an igniter collar having a main body portion in which an igniter is accommodated, and a joining portion at which the ignition device is attached to the cylinder. 6. The actuator according to claim 5, wherein the cylinder has a communication hole, in a peripheral wall thereof, that receives pressure generated by the ignition device. 7. The actuator according to claim 3, wherein the ignition device includes an igniter collar having a main body portion in which an igniter is accommodated, and a joining portion at which the ignition device is attached to the cylinder. 8. The actuator according to claim 7, wherein the cylinder has a communication hole, in a peripheral wall thereof, that receives pressure generated by the ignition device.