Gas spring with means for retaining piston adjacent one terminal position

US4307874A · kind A · utility

Assignee

• Stabilus GmbH · DE

Inventors

• Hermann Reuschenbach · Koblenzer Straße, DE
• Rolf Langanke · Boppard, DE

Key dates

• Filing date: Oct 29, 1979
• Grant date: Dec 29, 1981
• Expiry date: Oct 29, 1999

Classification

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

Abstract

In the illustrative embodiments described, the two compartments of the cylinder cavity of a gas spring of the piston-and-cylinder type, separated by a piston assembly, are connected by first and second passages extending across the piston. A valve arrangement on the piston assembly opens the second passage in response to movement of the piston assembly towards a terminal position in the cylinder and closes the second passage in response to movement of the piston assembly away from the terminal position. The first passage is open at all positions of the piston assembly remote from the terminal position. Releasable locking structure in the cylinder is operable to close the first passage as the piston assembly approaches the terminal position, thereby to hold the piston assembly in such terminal position until the locking force is manually overridden.