# US 7,607,688 B2 · Rupturable member

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- Number: US 7,607,688 B2
- Document ID: US7607688B2
- Status: Granted
- Kind: B2
- Application number: 11/063,586
- Filed: 2005-02-24
- Published: 2005-09-22
- Granted: 2009-10-27
- Earliest claimed: 2004-02-25
- Assignees: Daicel Chemical Industries, Ltd.
- Inventors: Kazuhiro Kato; Shingo Oda; Hirotoshi Niwa; Yuji Kurihara
- Web page: https://patentgrep.com/patent/US7607688B2

## CPC

- F42B 3/04: for producing gas under pressure {(generators of inflation fluid especially adapted for vehicle air bags B60R21/26)}
- B60R 2021/26029: {Ignitors}
- Y10T 137/1744: Specific weakening point
- F42B: EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION (explosive compositions C06B; fuzes F42C; blasting F42D)
- B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A rupturable member in which the rupturing manner thereof can be controlled, and a gas generator using the rupturable member are provided. A fragile portion that ruptures preferentially and regulates the rupturing direction of the rupturable member is formed, the rupturable member being provided with a stress dispersion portion formed in a shape or structure to disperse stress when the rupturable member is ruptured, in the tip end of the fragile portion or forward for the rupturing direction of the fragile portion.

## Claims

### Claim 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.

### Claim 2

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
wherein the fragile portion is formed in a linear shape, and the stress dispersion portion is provided in both ends in the length direction of the fragile portion formed in a linear shape, and
wherein the stress dispersion portion is fan-shaped.