The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 12, 2002
Filed:
Aug. 24, 2000
Hiroki Takehara, Tokyo, JP;
Hikaru Kameyoshi, Tokyo, JP;
Hiromasa Tanji, Tokyo, JP;
Joji Mishina, Tokyo, JP;
Takata Corporation, Tokyo, JP;
Abstract
To provide a pretensioner with improved safety, wherein gas is allowed to escape appropriately in the event that the internal gas pressure rises excessively, and there are no adverse effects on other equipment. A pretensioner is provided with a pipe and multiple balls are provided within the pipe. The balls are metal spheres such as aluminum and the ball nearest the gas generator is formed of a suitable material such as a resin of silicone rubber. A hole is bored in the resin ball in the longitudinal direction of the pipe. The hole is plugged off at the side of the gas generator and is opened on the side of the ball. A through hole perforating the next ball to the resin ball is bored in the longitudinal direction. A rod-shaped piston is stored between the hole of the resin ball and the hole of the next ball. When abnormal pressure is generated, the resin ball breaks and the gas pressure is placed directly on the piston. The abnormal pressure is thereby provided a pathway to dissipate in the direction of the balls'movement.