Pretensioner device for a seat belt

US9114780B2 · kind B2 · utility

Assignee

• Autoliv Development AB · SE

Inventors

• Christian Fischer · Fellbach, DE
• Martin Schmidt · Windisch, CH
• Matthias Steinberg · Elmshorn, DE
• Michael Pech · Hamburg, DE
• Tobias Voss · Klein Nordende, DE
• Thomas Schmidt · Timmendorfer Strand, DE
• Simone Mesecke-Rischmann · Hamburg, DE

Key dates

• Filing date: Nov 6, 2012
• Grant date: Aug 25, 2015
• Expiry date: Jul 24, 2033

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60R2022/4642
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A piston for a pretensioner device (10) for a motor vehicle seat belt system of a type having a gas generator (17) with the piston (21) guided in a tube (16) that closes a pressure space (20) in the tube (16). The pressure space (20) can be pressurized by the gas generator (17), driving the piston (21) to undergo pretensioning operation transmitted to the seat belt system by a force transmission means. The piston has a dome shaped front side adapted to engage a force transmission element and a skirt forming a sealing lip oriented toward the pressure space. At least one slot is formed in the outer surface of the piston extending axially from the sealing lip. The slot can be enlarged by the material erosion caused by the pressure and/or pressure conditions in the pressure space produced by gas from the gas generator.