Airbag device

1. An airbag device adapted to be mounted on a vehicle, comprising:

an airbag that is folded and is configured to unfold and be inflated with an inflation gas for protecting a vehicle occupant;

a housing that houses the airbag;

a connecting member that extends from the airbag; and

an actuator that is mounted on the housing and coupled with the connecting member, the actuator being configured to either stay coupled with or be disengaged from the connecting member for controlling an inflation manner of the airbag,

wherein the actuator includes:

an actuator body that includes an operating pin which penetrates and thus is coupled with the connecting member as the airbag device is mounted on the vehicle, the actuator body being configured to retract the operating pin and release the connecting member when actuated;

a mounting plate that holds the actuator body and is secured to the housing; and

a supporting plate that is secured to the housing at a vicinity of a leading end portion of the operating pin and is disposed opposite to a peripheral portion that is disposed in a periphery of the operating pin such that the connecting member as coupled with the operating pin is disposed between the supporting plate and the peripheral portion, wherein the supporting plate includes a supporting hole for receiving the operating pin, and a flange that is formed in a part of a periphery of the supporting hole toward which the connecting member is to be released, the flange extending along an axial direction of the operating pin towards the leading end portion of the operating pin as passing through the supporting hole for supporting the leading end portion of the operating pin with a surface thereof facing towards the operating pin.

2. The airbag device of claim 1 , wherein the operating pin is solid in its entirely from a root portion to the leading end portion which passes through the supporting hole.

3. The airbag device of claim 1 , wherein the mounting plate includes:

a mounting tongue that is disposed in proximity to the supporting plate and secured to the housing;

a holding plate that is formed generally perpendicularly to the mounting tongue and holds the actuator body, the holding plate including a through hole which the operating pin goes through, and a peripheral portion of the through hole that is fixed to the actuator body such that the holding plate holds the actuator body;

a connecting portion that couples the mounting tongue and the holding plate together and is formed in such a manner as to circumvent the connecting member of the airbag; and

an extended tongue that is formed in an edge of the holding plate facing towards the housing, the extended tongue extending generally in parallel to the mounting tongue towards a direction away from the mounting tongue in such a manner that a gap is formed between the housing and the extended tongue.

4. The airbag device of claim 3 , wherein the supporting plate and the mounting tongue of the mounting plate are fastened together to the housing.

5. The airbag device of claim 4 , wherein the supporting plate and the mounting tongue are fastened together to the housing with a single fixing member in a state in which the supporting plate and the mounting tongue have been temporarily assembled together in advance.