Gas spring with means for impeding piston movement away from one terminal position

US4323224A · kind A · utility

Assignee

• Stabilus GmbH · DE

Inventors

• Herbert Freitag · Koblenz, DE
• Klaus Schnitzius · Rheinbrohl, DE

Key dates

• Filing date: Jul 9, 1979
• Grant date: Apr 6, 1982
• Expiry date: Jul 9, 1999

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16F9/49
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A gas spring of the piston-and-cylinder type in which the two compartments of the cylinder cavity, separated by a piston assembly, are connected by a first passage. A valve arrangement on the piston assembly defines a second passage between the compartments and closes in response to movement of the piston assembly away from a terminal position in the cylinder while opening in response to movement of the piston assembly towards the terminal position. Releasable locking structure carried in part by the cylinder and in part by the piston assembly cooperates to close the first passage when the piston assembly approaches the terminal position, thereby to hold the piston assembly in such terminal position.