| 摘要 |
PROBLEM TO BE SOLVED: To provide an air bag for opening a part of a vent hole and closing a great part in the initial stage of inflation and increasing an opening quantity of the vent hole when internal pressure of an air bag becomes prescribed pressure or more. SOLUTION: This air bag 1 has the almost semicircular vent hole 5 and an almost semicircular cover 6 for covering this vent hole 5. The cover 6 is arranged along an inside surface of the air bag 1. An arc part of the vent hole 5 and an arc part of the cover 6 are joined by a joining means such as a sewing thread 7. A chord part of the vent hole 5 and a chord part of the cover 6 overlap each other by non-bonding. A communicating part 6c is arranged in the cover 6. The vent hole 5 is closed in a great part by the cover 6 in the initial stage of inflation of the air bag, and a part is opened by the communicating part 6c. When the internal pressure of the air bag becomes prescribed pressure or more, a non-bonding part of the cover 6 protrudes outside the vent hole 5 to increase the opening quantity of the vent hole 5.
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