Patent ID: 7040652

Claim:
A head protecting airbag device comprising: an airbag folded and housed in the upper longitudinal edge of the window on the interior side of a vehicle and adapted to expand and inflate downward, when it admits an inflating gas, to cover the interior side of said window; and an inflator for feeding said airbag with the inflating gas, wherein said airbag includes: an inflation portion to inflate, when it admits the inflating gas, to separate an interior side wall portion and an exterior side wall portion of the airbag, thereby to shield said window; and one tubular connection port portion arranged close to the longitudinal middle of an upper edge side of said airbag and formed to communicate with said inflation portion and to protrude upward from said inflation portion, for guiding the inflating gas from said inflator to said inflation portion, wherein said connection port portion includes: an outlet side portion having a communication port at a lower end thereof for communicating with said inflation portion and releasing the inflating gas to said inflation portion; and an inlet side portion arranged above said outlet side portion and connected to said inflator for admitting the inflating gas from said inflator, wherein said inflator includes: a cylindrical body portion having a gas discharge port opened on the outer circumference side for discharging the inflating gas; and a diffuser formed of a metal into a cylindrical shape to extend over said gas discharge port of said body portion, wherein the diffuser is connected to a body portion of the inflator in a sealed manner at each of two ends of the diffuser, and a gas outlet port is formed on an outer periphery of the diffuser, and the inflation gas discharged from the discharge port is released from the outlet port, and wherein the diffuser of said inflator is: inserted into the inlet side portion of the connection port portion of said airbag and connected to said connection port portion with good sealing properties; and arranged so that said gas outlet port faces toward said communication port of said connection port portion and thus toward said inflation portion, and wherein, in the connection port portion, said inlet side portion is bent with respect to an upper side of said outlet side portion, at least when mounted on the vehicle, to form an L-shape, such that the inlet side portion is perpendicular to the outlet side portion.