Rotary power apparatus

US3984127A · kind A · utility

Assignee

• Dynamit Nobel GmbH · DE

Inventors

• Hellmut Bendler · Birkenfeld, DE
• Uwe Brede · Ergolding, DE
• Egon Flach · Cologne, DE
• Gerrit Scheiderer · Fürth, DE

Key dates

• Filing date: May 5, 1975
• Grant date: Oct 5, 1976
• Expiry date: May 5, 1995

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60R22/4628
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A rotary power device for use in conjunction with tensioning mechanism of safety devices for the protection of passengers in vehicles and the like. The preferred embodiment disclosed is used for tensioning safety belts of a vehicle passenger restraint system in response to predetermined experienced deceleration such as occur in an accident situation. The rotary power device includes a rotary piston guided in a helically wound guide track such that the piston moves both rotatably and axially in response to compressed gas forces against a pressure face which extends in a plane containing the axis of rotation of the piston. A coupling bushing arrangement is interposed between the piston and the rotating shaft accommodating the safety belt, with axial movement of the piston with respect to the bushing and shaft, and with rotatable locking of the piston and shaft. In preferred embodiments, the rotary locking of the piston and the shaft is initiated only after the release of compressed gases causes an axial shifting of the bushing.