Head protecting airbag

A head protecting airbag folded and housed in an upper part of a window so as to be inflatable to cover an interior side of the window when an inflation gas flows therein, comprising:

• a bag body provided with a joined bag formed by joining outer peripheral parts of an interior wall portion and an exterior wall portion, the bag body having an inflation main part which is inflatable to cover the window when the inflation gas is allowed to flow therein and a tubular connection port part which communicates with an upper side of the inflation main part so as to be connected to an inflator for supplying the inflating gas;
• and
• an inner tube which extends in the connection port part along an upper edge of an inside of the inflation main part and which has a gas outlet port for supplying the inflation gas downward;
• wherein the inner tube is housed within the bag body so as not to be joined to an inner peripheral surface of the inflation main part of the bag body except for a location that is in a vicinity of the connection port part, and
• an outer periphery of the inner tube except for a location that is in a vicinity of the gas outlet port is supported by a support cloth which is joined integrally to the inflation main part to have a shape such that the support cloth wraps around the inner tube within the inside of the inflation main part,
• wherein the support cloth has a shorter longitudinal length than that of the inner tube, and
• an upper edge of the support cloth is joined to upper edges of the outer peripheral parts of the interior and exterior wall portions located above the inner tube, when the outer peripheral parts of the interior and exterior wall portions are jointed to each other and
• a lower edge of the support cloth is joined to one of the interior and exterior wall portions at a location below the inner tube.

A head protecting airbag folded and housed in an upper part of a window so as to be inflatable to cover an interior side of the window when an inflation gas flows therein, comprising:

• a bag body provided with a joined bag formed by joining outer peripheral parts of an interior wall portion and an exterior wall portion, the bag body having an inflation main part which is inflatable to cover the window when the inflation gas is allowed to flow therein and a tubular connection port part which communicates with an upper side of the inflation main part so as to be connected to an inflator for supplying the inflating gas;
• and
• an inner tube which extends in the connection port part along an upper edge of an inside of the inflation main part and which has a gas outlet port for supplying the inflation gas downward;
• wherein the inner tube is housed within the bag body so as not to be joined to an inner peripheral surface of the inflation main part of the bag body except for a location that is in a vicinity of the connection port part, and
• wherein a separable portion between the interior and exterior wall portions which is formed by separably joining the interior and wall portions to each other are located below the inner tube except for a location that is in a vicinity of the gas outlet port, such that the separable portion of the inflation main part and an upper part of the inflation main part located above the separable portion support the inner tube,
• the separable portion is separated at a time when an internal pressure of the inflation main part is increased before a completion of inflation of the inflation main part.