Chair with pneumatically adjustable seat height and back support inclination

US4072288A · kind A · utility

Assignee

• Stabilus GmbH · DE

Inventors

• Winfried Wirges · Koblenz, DE
• Herbert Freitag · Koblenz, DE

Key dates

• Filing date: May 17, 1976
• Grant date: Feb 7, 1978
• Expiry date: May 17, 1996

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A47C3/30
• WIPO field: Furniture, games
• WIPO sector: Other fields

Abstract

The height of a chair and the inclination of its back support may be varied by changing the respective, effective lengths of two pneumatic springs whose assembly forms the chair leg. The cylinder of one spring is coaxially received in the cylinder or the hollow piston rod of the other spring, and relative axial movement of the received spring and the receiving element of the other spring is limited or entirely prevented. A valve connects the two compartments separated in the cylinder of each spring and may be operated by a mechanism separate from the valve operating mechanism of the other spring.