Air-bag device
View Patent ↗An air-bag device includes an air bag stored in an inner side of a backrest in a vehicle width direction, and an inflator that inflates and expands the air bag. The air bag includes a first chamber that houses the inflator such that the longitudinal direction of the inflator matches the vertical direction of the air bag, and a second chamber that is located above the first chamber and is inflated and expanded by a gas ejected from an upper end of the inflator to form a tubular shape extending upward above the first chamber.
1. An air-bag device, comprising:
an air bag stored in an inner side of a backrest in a vehicle width direction; and
an inflator that inflates and expands the air bag, wherein
the air bag includes
a first chamber that houses the inflator such that a longitudinal direction of the inflator matches a vertical direction of the air bag,
a second chamber that is located above the first chamber and is inflated and expanded by a gas ejected from an upper end of the inflator to form a tubular shape extending upward above the first chamber, and
a third chamber that is inflated and expanded at a position lateral to the second chamber;
the first chamber is separated from the third chamber by a first partition, and the second chamber is separated from the third chamber by a second partition that extends from an upper edge of the air bag along a longitudinal direction of the air bag;
a first flow path that allows the gas to flow from the second chamber into the third chamber is formed between an upper end of the first partition and a lower end of the second partition; and
a second flow path that allows the gas to flow from the first chamber into the third chamber is formed between a lower end of the first partition and a lower edge of the air bag.
2. The air-bag device as claimed in claim 1 , wherein the second chamber dead-ends at a top of the second chamber.
3. The air-bag device as claimed in claim 1 , wherein the second partition includes a part that is parallel to a rear edge of the air bag.
4. The air-bag device as claimed in claim 1 , wherein the second chamber is inflated and expanded into the tubular shape that is inclined with respect to the longitudinal direction of the inflator.
5. The air-bag device as claimed in claim 1 , wherein the air bag further includes a regulator that controls flow rates of the gas distributed from the first chamber to the second chamber and the third chamber.
6. The air-bag device as claimed in claim 1 , wherein each of the first partition and the second partition is a junction that joins a pair of panel sheets of the air bag.
7. The air-bag device as claimed in claim 6 , wherein the junction is a seam to which a sealant is applied.
8. The air-bag device as claimed in claim 1 , wherein the air bag is accordion-folded in a longitudinal direction of the air bag.
9. The air-bag device as claimed in claim 8 , wherein the air bag is accordion-folded in the longitudinal direction of the air bag after the second chamber is folded back.