Gas spring for motor vehicle with retaining drive for preventing piston rod return toward its operational, outermost position after accident

US4779845A · kind A · utility

Assignees

• Daimler-Benz AG · DE
• Stabilus GmbH · DE

Inventors

• Hans-Georg Bartesch · Böblingen, DE
• Volker Nickel · Vöhringen, DE
• Manfred Muller · Wuppertal, DE
• Herbert Freitag · Koblenz, DE
• Klaus Schnitzius · Rheinbrohl, DE

Key dates

• Filing date: Apr 18, 1983
• Grant date: Oct 25, 1988
• Expiry date: Apr 18, 2003

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T292/65
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

In the illustrative embodiment of the invention as described an engine bonnet is articulated to the framework of a motor car. A gas spring is articulated to both the framework and the bonnet. The gas spring balances part of the weight of the bonnet when the bonnet is to be opened by hand. In case of an accident the framework and/or the bonnet may be crushed in longitudinal direction of the car. In such case the piston rod of the gas spring is pushed inward of the cylinder beyond the normal innermost operational position and a retaining device becomes effective so as to prevent the piston rod from returning towards its outermost operational position.