Longitudinally controllable adjustment device

US5079992A · kind A · utility

Inventors

• Hans J. Bauer · Altdorf, DE
• Ludwig Stadelmann · Altdorf, DE
• Herbert Wolf · Wooster, US

Key dates

• Filing date: Jul 11, 1990
• Grant date: Jan 14, 1992
• Expiry date: Jul 11, 2010

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16F9/363
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A longitudinally controllable adjustment device comprises a cylindrical housing, in which a piston rod with a piston is slidable and sealingly extending outwards. Furthermore it comprises a valve for controlling length adjustment of the device. In order to avoid a destruction of seals preventing a flow to the outside of pressure medium at least two seals are provided between the housing and the piston rod whereby a seal between the outer end of the housing and a further seal prevents an inflow of gas and in particular of liquid from the outside into the housing.