Pretensioning device for a safety belt

US8684413B2 · kind B2 · utility

Assignee

• Autoliv Development AB · SE

Inventors

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

Key dates

• Filing date: Mar 3, 2011
• Grant date: Apr 1, 2014
• Expiry date: Mar 3, 2031

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60R2022/4661
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A pretensioning device (10) for a safety belt, of a motor vehicle, having a gas generator (17), a piston (21) guided in a tube (16), which closes a pressure area (20) in the tube (16) that is pressurized by the gas generator (17) whereupon the piston (21) is able to move in a pretensioning movement which is able to be conveyed to the safety belt by means of an inertia body (19a) resting on a front face (9) of the piston (21). The piston (21) forms a pass-through opening (1) releasable upon exceeding of a predetermined pressure and a recess (26) is provided in the front face (9) with an inertia body (19a) resting thereon, so that a flow connection is created from the pass-through opening (1) to the area (25) located behind the piston (21) in the direction of the pretensioning movement (S).