Gas spring including hydraulic locking means

US4445671A · kind A · utility

Assignee

• Stabilus GmbH · DE

Inventors

• Hermann Reuschenbach · Koblenzer Straße, DE
• Egon Sentinger · Koblenz, DE

Key dates

• Filing date: Oct 14, 1981
• Grant date: May 1, 1984
• Expiry date: Oct 14, 2001

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A47B27/16
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A gas spring for height adjustment of drawing-tables or the like includes an arrangement for hydraulically locking the gas spring against sudden collapse due to overloading or loss of internal gas pressure. The hydraulic locking mechanism includes a pressure responsive valve which operates, in response to an excess pressure differential between the gas spring cavity and the pressurized gas chamber, either to prevent flow of the hydraulic locking medium out of the cylinder cavity or to restrict such flow to a slow, safe rate.