Wind-up mechanism for the elimination of belt looseness in a safety belt system

US4213581A · kind A · utility

Assignee

• Daimler-Benz AG · DE

Inventors

• Rudolf Andres · Sindelfingen, DE
• Helmut Grantz · Sindelfingen, DE
• Gunter Abersfelder · Sindelfingen, DE
• Gerhard Busch · Seevetal, DE

Key dates

• Filing date: Feb 1, 1979
• Grant date: Jul 22, 1980
• Expiry date: Feb 1, 1999

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60R21/017
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A wind-up mechanism for eliminating the belt looseness of a safety belt system when exceeding a predetermined deceleration, in which an ignitable propellant charge, provided for triggering the retraction movement of the belt is arranged centrally in the hollow shaft of a belt roller that blocks automatically in case of danger. A liquid medium is preferably disposed in front of the propellant charge which, after the ignition of the propellant charge, drives a rotor coupled at that instant with the wind-up roller so as to eliminate the belt looseness by the gases forming during the ignition of the propellant charge. The hollow shaft accommodates at one end a cap and a toothed rim connected therewith, into which engages a blocking mechanism triggered in case of danger, while at least a part of the rotor is formed-on at the other end of the shaft in the course of a cold-flow or casting operation.