Head protection airbag device

1. A head protection airbag device comprising:

an airbag which is formed so as to cover a window of a vehicle at a time of development and inflation and so as to be folded and stored on an upper edge side of the window on a vehicle interior side; and

a case which is made of a synthetic resin for storing a folded body of the airbag which is folded so that a lower edge side of the airbag at a time of inflation completion is made close to an upper edge side of the airbag, wherein

the airbag has an engaging hole on the upper edge side thereof through which an engaging protrusion formed on a side of the case can pass,

the case includes the engaging protrusion disposed so as to protrude outward on an outer peripheral face side of an area that covers an upper face side of the folded body,

on the upper edge side of the airbag, a portion constituting a peripheral edge of the engaging hole has recessed sections recessed from an upper edge of the airbag in front of and behind the engaging hole so as to have a tab-shaped portion formed into a tab shape so that the upper edge side can be pulled away from the folded body, and

in a state in which the airbag is flatly developed, an upper edge of the tab-shaped portion that has the engaging hole is disposed nearly on a same line as an upper edge of a general section of the airbag which is adjacent to the tab-shaped portion.

2. The head protection airbag device according to claim 1 , wherein

the case includes:

a case body which stores the folded body; and

a winding band which is formed at a portion of the case body in a vicinity of a support section from which the engaging protrusion protrudes, which extends from the case body so as to be adjacent to the support section with a space therebetween and which is wound around the folded body stored in the case body, and

a tip end side of the winding band is engaged with a side of the case body, the winding band holds the folded body stored inside the case body and the winding band can release winding at the time of development and inflation of the airbag.

3. The head protection airbag device according to claim 1 , wherein

the airbag includes:

a band body which covers the vehicle interior side of the window at the time of inflation completion; and

an installing piece which is formed so as to protrude upward from an upper edge side of the bag body and which is installed on the upper edge side of the window,

the installing piece is separated from the bag body and a base section side thereof is joined to the upper edge side of the bag body, and

the tab-shaped portion is configured such that the recessed sections are disposed away from a positioning opening that is used at a time when the installing piece is joined to the bag body, in a vicinity of the installing piece.

4. The head protection airbag device according to claim 1 , wherein

the airbag includes:

a bag body which covers the vehicle interior side of the window at the time of inflation completion;

an installing piece which is formed so as to protrude upward from an upper edge side of the bag body and which is installed on the upper edge side of the window; and

a connection port section which protrudes upward from an upper edge of the bag body and which is connected to an inflator,

the installing piece and the connection port section are separated from the bag body, and

the bag body is formed by hollow weaving.

5. The head protection airbag device according to claim 4 , wherein

the tab-shaped portion is configured such that the recessed sections are disposed away from a positioning opening that is used at a time when the installing piece is joined to the bag body, in a vicinity of the installing piece.

6. The head protection airbag device according to claim 1 , wherein

shapes of the recessed sections disposed in front of and behind the tab-shaped portion are asymmetrical in a front-rear direction.