Cylinder-piston device

US4467899A · kind A · utility

Assignee

• Stabilus GmbH · DE

Inventors

• Werner Molders · Plaidt, DE
• Herbert Freitag · Koblenz, DE
• Lawther O. Smith · Doylestown, US

Key dates

• Filing date: Jul 22, 1983
• Grant date: Aug 28, 1984
• Expiry date: Jul 22, 2003

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16F9/344
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

In the illustrative embodiments of the invention disclosed, the piston unit of a gas spring incorporates a meander-shaped fluid passage for interconnecting the working chambers on either side of the piston unit so as to dampen movement of the piston rod relative to the cylinder. The meander-shaped passages may be constituted by a sequence of passage sections arranged at right angles to one another and, in one embodiment, are formed in the end faces of the piston member so as to lie in planes transverse to the axis of the cylinder. If desired, additional fluid passage units may be connected in series to provide an enhanced damping effect.