Patent ID: 6860506

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 admitting 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 the 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 cylinder 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 and to be connected with said body portion by forcing a root end of the diffuser onto a head portion of said body portion, and having a gas outlet port opened on the outer circumference for releasing the inflating gas, and wherein said 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; the head protecting airbag device further comprising: a mounting bracket holding the body portion of the inflator, the mounting bracket being positioned apart from the gas discharge port; wherein the inflator is arranged so that said diffuser is disposed away from said mounting bracket and is disposed to cover said gas discharge port.