| 摘要 |
PURPOSE:To obtain a product which is thin and whose appearance is not impaired, by forming a rupture part from a recessed groove part formed in the vicinity of a hollow brittle part formed along the rupture line of a car room member. CONSTITUTION:On the reverse surface side of an air bag door 10, a thin rupture part 13 consisting of a hollow brittle part 14 and a recessed groove part 15 is formed. The rupture part 13 is ruptured is preference when the air bag 10 is applied with the expansion pressure of an air bag 47 from the reverse surface, and the door part 11 is opened speedily and surely, and is formed along the rupture line of a car room side member 40. The stream of the high pressure gas G which is poured into the groove part 36 on the mold surface is controlled to the direction of the resin having the high fluidity, and transferred toward the air bag door inside direction. A projection part 17 is formed toward the inner surface direction of the door part 11 to the sectional surface shape of the space part of the hollow brittle part 14. |
