Patent · US Expired

Continuously adjustable levelling column

US4756496A · kind A · utility

52Cited by

16References

20Claims

0Family size

Assignee

Stabilus GmbH · DE

Inventors

Hans-Josef Hosan · Neuwied, DE
Axel Knopp · Eitelborn, DE
Herbert Freitag · Koblenz, DE
Peter Schlottermuller · Reinheim, DE

Key dates

Filing date	May 21, 1985
Grant date	Jul 12, 1988
Priority date	—
Expiry date	May 21, 2005

Classification

Technology area (CPC A)Human Necessities
CPC primaryA47C3/30
WIPO fieldFurniture, games
WIPO sectorOther fields

Abstract

A continuously adjustable levelling column for chairs comprises a guide tube having a lower end and an upper end. A telescopic tube is guided within the guide tube and has a tapered upper end portion extending beyond the upper end of the guide tube. A gas spring is accommodated within the telescopic tube. This gas spring is axially fixed within the telescopic tube. The upper end of a container of the gas spring abuts through a distance piece a support face at the upper end of the tapered portion of the telescopic tube. A piston rod passing through the lower end of the gas spring is axially fixed with respect to the lower end of the guide tube. A locking control pin extends through the upper end of the gas spring and is engageable through a transmission pin by a control handle.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.