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An airbag apparatus configured so that an amount of gas introduced into an airbag is varied by shifting the position of a closing member to open vent openings. The apparatus includes a mechanism for preventing gas generated by a gas generator from leaking through the vent openings when the closing m

An airbag apparatus configured so that an amount of gas introduced into an airbag is varied by shifting the position of a closing member to open vent openings. The apparatus includes a mechanism for preventing gas generated by a gas generator from leaking through the vent openings when the closing member is closed. A base of the airbag is clamped between a heat shield plate and a retainer. The retainer includes vent openings and the base of the airbag covers the vent openings. The heat shield plate has openings corresponding to the vent openings for allowing gas to flow out of the retainer. The closing member has a plurality of openings, for allowing the gas to flow out, at the same disposing interval as that of the vent openings. When the airbag is not inflated, the openings are positioned so as to be out of line with the vent openings.

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1. An airbag apparatus comprising: a folded airbag; a casing to which the folded airbag is connected; a gas generator for generating gas for inflating the airbag; a plurality of vent openings disposed on the casing for discharging a portion of the gas generated by the gas generator out of the

1. An airbag apparatus comprising: a folded airbag; a casing to which the folded airbag is connected; a gas generator for generating gas for inflating the airbag; a plurality of vent openings disposed on the casing for discharging a portion of the gas generated by the gas generator out of the casing; at least one closing member covering the vent openings; and at least one shifter for opening the vent openings by shifting the position of the closing member, wherein the closing member and the casing have a layer interposed therebetween so that the vent openings are covered by the layer; and wherein the layer is adapted to be melted by the gas generated by the gas generator. 2. The airbag apparatus according to claim 1, wherein the layer comprises part of the airbag. 3. The airbag apparatus according to claim 1, wherein the closing member is disposed in the casing. 4. The airbag apparatus according to claim 3, wherein the shifter is disposed outside the casing and the closing member has an outwardly extending portion which extends therefrom and which is connected to the shifter. 5. The airbag apparatus according to any one of claim 1, wherein the gas generator includes a plurality of gas discharge ports disposed to face the corresponding vent openings. 6. An airbag apparatus comprising: a gas generator; a retainer connected to an airbag and including a plurality of vent openings for discharging a portion of gas generated by the gas generator; a closing member covering the vent openings; and wherein the airbag includes a sealing portion located between the retainer and the closing member, the sealing portion covering the vent openings and acting as a gasket between the retainer and the closing member. 7. The airbag apparatus of claim 6, wherein the closing member is movable between a first and second position. 8. The airbag apparatus of claim 7, wherein the second position of the closing member uncovers the vent openings so that the gas generated by the gas generator melts the sealing portion of the airbag and escapes from the retainer. 9. An airbag apparatus comprising: an airbag connected to a retainer including a plurality of vent openings; an inflator for providing gas for inflating the airbag; a closing member configured to move between a first position in which the vent openings are closed and a second position in which the vent openings are open thereby allowing a portion of gas generated by the inflator to be discharged through the vent openings; and wherein the airbag includes a sealing portion located between the retainer and the closing member thereby reducing leakage through closed vent openings. 10. The airbag apparatus of claim 9, wherein the sealing portion is configured to melt when exposed to gas generated by the inflator so that when the closing member is in the second position the portion of the gas can be discharged.