Tensioning device for a safety belt

US9050941B2 · 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: Oct 12, 2010
• Grant date: Jun 9, 2015
• Expiry date: Jan 11, 2032

Classification

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

Abstract

A tensioning device (10) for a seat belt, in particular in a motor vehicle, having a gas generator (17) and a piston (21) guided in a tube (16) that closes a pressure space (20) in the tube (16), whereas the pressure space (20) can be pressurized by the gas generator (17), as a result of which the piston (21) can be driven to perform a tensioning operation which can be transmitted to the seat belt by means of the force transmission means. The piston (21) having a closed or constricted opening (1, 1a), and the opening (1, 1a) can be enlarged and/or opened by the material erosion caused by the pressure and/or pressure conditions in the pressure space (20).