Patent ID: 7607688
Filing Date: 2009-10-27
Classification: B60R,F42B,Y10T

Abstract:
1. A rupturable member that ruptures due to pressure or an impact wave, comprising: a fragile portion that ruptures preferentially and regulates the rupturing direction of the rupturable member; and a stress dispersion portion having a shape or structure that disperses stress during the rupturing of the rupturable member, the stress dispersion portion being a concavity and formed only in an end of the fragile portion or only in a vicinity of and away from the end to prevent the rupturable member from rupturing beyond the stress dispersion portion, wherein the thickness of the rupturable member at the stress dispersion portion is formed to be less than the thickness of the rupturable member at a deepest portion of the fragile portion, and wherein the stress dispersion portion is fan-shaped.