Lengthwise-adjustable gas spring

US3966182A · kind A · utility

Assignee

• Suspa Federungstechnik Fritz Bauer & Shone Ohg · DE

Inventors

• Ludwig Stadelmann · Altdorf, DE
• Fritz Bauer · Purkersdorf, AT

Key dates

• Filing date: Jul 30, 1975
• Grant date: Jun 29, 1976
• Expiry date: Jul 30, 1995

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16F9/56
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A lengthwise-adjustable, compressed-gas-filled gas spring, particularly for continuous height adjustment of chairs, seats, tables, or the like, has two cylinders, coaxially mounted one inside the other, and leaving an annular chamber therebetween. A piston and piston rod are displaceably provided within the inner cylinder, the piston sealingly dividing the cylinder into a first housing chamber, on the piston rod side, and a second housing chamber. The piston rod extends sealingly out of the cylinders. The first housing chamber has a fluid connection to the annular chamber at all times. The inner cylinder has a passageway therethrough near the end opposite the piston rod end, and is axially displaceable within the center cylinder between a first position at which the passageway is sealed off and a second position at which a fluid connection is allowed between the second housing chamber and the annular chamber.