Air bag for side air bag device

An air bag for a side air bag device adapted to be mounted on the peripheral edge of a door opening inside of the compartment of a vehicular body, comprising:

• an air bag having a generally rectangular bag shape having a gas inlet for introducing an inflating gas so as to cover said door opening when inflated, and having a tensing joint partially jointing an inner side wall and an outer side wall is arranged to form a tension line for establishing a tension at the time of expansion,
• such that a plurality of said tensing joints are juxtaposed along the direction of said tension line so as to cross said tension line,
• such that said individual tension joints are arranged generally at vertical middle portions so as to form one expansion
• such that said air bag is so arranged that its expansion area includes, when inflated, a portion of a center pillar so as to be supported by said center pillar when expanded, and
• such that said portion to be supported by the center pillar at the time of inflation is expanded such that said portion is thicker than the remaining ordinary expansion thickness.

A side air bag device for installation in a vehicular body, comprising:

• an air bag having an inner wall and an outer wall adapted to be mounted on a peripheral edge of a door opening on an inside of the vehicular body, and folded and accommodated along a roof side rail such that said air bag is capable of inflating to cover the door opening;
• wherein said air bag includes an upper side mounted on said roof side rail of said vehicular body and a lower side extending in a front and a rear of the air bag and arranged to face said upper side and a free end of the air bag;
• wherein a plurality of joints joint the inner wall and the outer wall in a position between said upper side and said lower side and restrict expansion of said air bag, said plurality of joints divide said upper side from said lower side;
• wherein an upper space for an inflating gas to flow therethrough is defined in said upper side;
• and
• wherein the air bag is folded in a bellows shape with said inner wall and said outer wall collapsed together and overlapping each other such that folded overlapping faces are generally at a right angle with respect to a door inside face of said vehicular body.

A side air bag device for installation in a vehicular body, comprising:

• an air bag having an inner wall and an outer wall adapted to be mounted on a peripheral edge of a door opening on an inside of the vehicular body, and folded and accommodated along a roof side rail such that said air bag is capable of expanding to cover the door opening;
• wherein said air bag includes an upper side mounted on said roof side rail of said vehicular body and a lower side extending in a front and a rear of the air bag and arranged to face said upper side and a free end of the air bag;
• wherein a plurality of joints join the inner wall and the outer wall in a position between said upper side and said lower side and restrict expansion of said air bag, said plurality of joints divide said upper side from said lower side;
• wherein a lower space for an inflating gas to flow therethrough is defined in said lower side;
• and
• wherein the air bag is folded in a bellows shape with said inner wall and said outer wall collapsed together and overlapping each other such that folded overlapping faces are generally at a right angle with respect to a door inside face of said vehicular body.

A side air bag device for installation in a vehicular body, comprising:

• an air bag having an inner wall and an outer wall adapted to be mounted on a peripheral edge of a door opening on an inside of the vehicular body, and folded and accommodated along a roof side rail such that said air bag is capable of expanding to cover the door opening;
• wherein said air bag includes an upper side mounted on said roof side rail of said vehicular body and a lower side extending in a front and a rear of the air bag and arranged to face said upper side and a free end of the air bag;
• wherein a plurality of joints join the inner wall and the outer wall in a position between said upper side and said lower side and restrict expansion of said air bag, said plurality of joints divide said upper side from said lower side;
• wherein an upper space for an inflating gas to flow therethrough is defined in said upper side of said air bag and a lower space for said inflating gas to flow therethrough is defined in said lower side;
• and
• wherein the air bag is folded in a bellows shape with said inner wall and said outer wall collapsed together and overlapping each other such that folded overlapping faces are generally at a right angle with respect to a door inside face.