Actuator for airbag device

An actuator for an airbag device that is attached to a side of a housing portion housing an airbag which is folded,

• the actuator having a configuration in which an inflated state of the airbag can be controlled by coupling a coupling means extending from the airbag and by maintaining or releasing a coupled state to the coupling means, and
• the actuator comprising:
• a squib;
• a holding part that holds the squib on one end side;
• and a cap part that is disposed on an other end side of the holding part so as to face the squib,
• wherein
• the holding part includes a cylindrical part capable of covering a side on at least a proximal part side of the squib over an entire circumference,
• the cap part
• includes a ceiling part arranged to face the squib, and a peripheral wall part having a cylindrical shape extending from a peripheral edge of the ceiling part and arranged to cover an inner peripheral side or an outer peripheral side of the cylindrical part, is configured to close the other end side of the holding part, wherein the peripheral wall part is arranged on the inner peripheral side of the cylindrical part, and
• is configured to be attached to the holding part by locking the peripheral wall part to the cylindrical part, and when attached to the holding part, an inserted state where the cylindrical part or the peripheral wall part is inserted into an insertion hole formed on a tip side of the coupling means can be maintained, and
• when the ceiling part receives a pressure of a combustion gas generated when the squib operates, coupling to the coupling means can be released by moving the ceiling part while detaching the peripheral wall part from the cylindrical part, wherein
• a locking recess part or a locking projection that can be locked to each other is formed on an inner peripheral surface side of the cylindrical part or an outer peripheral surface side of the peripheral wall part, respectively,
• both the locking recess part and the locking projection are formed over an entire circumference of the cylindrical part or the peripheral wall part,
• the locking projection includes inclined surfaces on both end sides in a direction in which the peripheral wall part is inserted into the cylindrical part,
• the locking recess part includes inclined surfaces formed to correspond to the inclined surfaces of the locking projection,
• the locking projection is provided on the outer peripheral surface side of the peripheral wall part,
• the locking recess part is provided on the inner peripheral surface side of the cylindrical part,
• a cross-sectional of the locking projection in a direction in which the peripheral wall part is inserted into the cylindrical part has a flat, substantially trapezoidal shape,
• a width dimension of the locking projection along the direction in which the peripheral wall part is inserted into the cylindrical part and the width dimension of the locking recess part are substantially same, and
• a protrusion amount by which the locking projection protrudes is smaller than a recess amount by which the locking recess part recedes.