Adjusting device, particularly for adjustable chairs

Details Adjusting device, particularly for adjustable chairs Adjusting device, particularly for adjustable chairs

1987-05-11

1989-04-04

Foss, J. Franklin

Supports

Stand

Standard type

248631, 267 6412, 188300, F16F 932

Patent

active

048178985

ABSTRACT:
The adjusting device possesses a hydraulic cylinder in whose cylinder tube there are housed a main piston equipped with a piston rod, an auxiliary piston and a force-exerting spring. The cylinder tube is closed off at both of its ends by an associated end flange. The outer surface of the cylinder tube simultaneously constitutes the guide surface of a guide tube which is fixedly connected by means of a connecting flange with the piston rod. Since the cylinder tube possesses an essentially constant or uniform inner diameter and outer diameter, the guide tube can be constructed to be so long that the adjusting device is stable enough to serve as a supporting column or pillar, e.g. for a chair or other seat structure.

REFERENCES:
patent: 2953223 (1960-09-01), Dillenburger
patent: 3223206 (1965-12-01), Bainbridge
patent: 3388883 (1968-06-01), Axthammer
patent: 3547394 (1970-12-01), Wehner
patent: 3762514 (1973-10-01), Freitag
patent: 3787019 (1974-01-01), Freitag
patent: 4124207 (1978-11-01), Hatakeyama
patent: 4307874 (1981-12-01), Reuschenbach
patent: 4337850 (1982-07-01), Shimokura
patent: 4373707 (1983-02-01), Moldens
patent: 4632228 (1986-12-01), Oster

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