Adjustable-height column with depth spring action

Details Adjustable-height column with depth spring action Adjustable-height column with depth spring action

1998-04-09

2000-05-02

Berger, Derek J.

Supports

Stand

Standard type

2481621, 2481885, 248404, 2484062, 248415, 248631, 1081444, 108147, 108150, 91 27, 91319, 92 8513, F16M 1100

Patent

active

06056251&

ABSTRACT:
Adjustable-height column, especially for chairs, includes a guide tube and a pneumatic, selectively blockable piston-cylinder unit for height adjustment located in the guide tube. The piston sealingly subdivides the cylinder into two operational chambers. Beginning at a defined retracted setting of the piston-cylinder unit, the blocking function is compulsorily canceled, in that a fluid flow connection between the two operational spaces is established which overrides the blocking function. An additional spring element is placed in series with the piston-cylinder unit to prevent a sudden collapse of the column.

REFERENCES:
patent: 3091932 (1963-06-01), Webb
patent: 3711054 (1973-01-01), Bauer
patent: 3937307 (1976-02-01), De Kock
patent: 4108416 (1978-08-01), Nagase et al.
patent: 4124202 (1978-11-01), Hatakeyama
patent: 4245826 (1981-01-01), Wirges
patent: 4257582 (1981-03-01), Wirges
patent: 4635908 (1987-01-01), Ludwig
patent: 4817898 (1989-04-01), Locher
patent: 4964625 (1990-10-01), Kawamura
patent: 5377942 (1995-01-01), Knopp et al.
patent: 5839719 (1998-11-01), Hosan et al.

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