Patent ID: 7758072

Claim:
A pressure control apparatus of an airbag, comprising: an airbag housing; an airbag cushion mounted to the airbag housing; an inflator mounted to the airbag housing and supplying fluid into the airbag cushion for inflating the airbag cushion; a cylinder disposed to pass through the interior and exterior of the airbag housing; a piston disposed to be slidably movable within the cylinder; a pressing member disposed within the cylinder to press the piston in an outward direction of the airbag housing; and a tether, a distal end portion of which is connected to at least a portion of the interior of the airbag cushion and a proximate end portion of which is connected to a proximate end portion of the piston to move the piston as the airbag cushion is inflated by overcoming the pressing member, wherein the cylinder has at least a gas inlet positioned inside the airbag housing and releasing a portion of compressed fluid in the airbag cushion into the cylinder therethrough and at least a gas outlet positioned outside the airbag housing and selectively releasing the compressed fluid flowing into the cylinder via the at least a gas inlet outside the cylinder therethrough by the piston.