Patent ID: 8382154

Claim:
An airbag device comprising an airbag that is inflated and expanded by means of gas supplied from a gas generator to constrain a target to be protected, wherein the airbag includes: an airbag main body having a vent hole for gas evacuation, a rectification cloth arranged at the airbag main body and configured to switch the vent hole from an opened state to a closed state and further to the opened state; and a guide base cloth having an opening, being engaged with the airbag main body, and guiding slide movement in a longitudinal direction of the rectification cloth, the opening being superimposed on the vent hole, the rectification cloth having a band-shaped portion and leg portions separately extending in a V-shape, from a partway in a longitudinal direction of the band-shaped portion, an end portion of the rectification cloth is engaged with the airbag main body, each of end portions of the leg portions is engaged with the airbag main body so that a partial portion of the rectification cloth can be protruded through the vent hole to an outside of the airbag main body, between the airbag main body and the guide base cloth, the band-shaped portion is configured to have a horizontal width dimension enough to open or close the vent hole or an opening of the guide base cloth, the guide base cloth has a first guide passageway configured to guide the band-shaped portion and one pair of second guide passageways, a respective one of which is configured to guide said each leg portion, the opening of the guide base cloth is formed in the first guide passageway, when the rectification cloth is in a state before inflation and expansion of the airbag main body, the vent hole or the opening of the guide base cloth is arranged between the leg portions of the rectification cloth, when an internal pressure of the airbag main body reaches a predetermined internal pressure after inflation and expansion of the airbag main body, the vent hole or the opening is closed by the band-shaped portion, and when the airbag main portion constrains the target and the rectification cloth slackens, the partial portion of the rectification cloth is protruded from the vent hole to the outside to make the vent hole in the opened state.