Mass-body drive for a rotary tightening device

US5881962A · kind A · utility

Assignee

• Autoliv Development AB · SE

Inventors

• Thomas Schmidt · Timmendorfer Strand, DE
• Klaus Butenop · Herzhorn, DE
• Doris Kröger · Tornesch, DE
• Jorg Barckmann · Tornesch, DE
• Rene Rade · Pinneberg, DE

Key dates

• Filing date: Oct 11, 1996
• Grant date: Mar 16, 1999
• Expiry date: Oct 11, 2016

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S60/905
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A rotary tightening device for a safety belt has a belt retractor including a housing and a belt take-up shaft rotatably supported in the housing. The belt-take-up shaft has one end of the safety belt connected thereto. Upon triggering of the rotary tightening device, the belt take-up shaft is rotated in a belt take-up direction of the safety belt. A drive wheel is connected to the shaft. The housing has a channel extending in a plane parallel to a radial plane of the drive wheel and extending at least partially about a circumference of the drive wheel. Mass bodies are positioned loosely adjacent to one another in the channel. The mass bodies, when accelerated, act on the drive wheel for driving it. The drive wheel has at the circumference a gearing in which the mass bodies are received for driving the drive wheel. A spacing of the gearing is substantially identical to a spacing between the mass bodies.