Hydraulic lifting mechanism for a chair or the like using a two

Details Hydraulic lifting mechanism for a chair or the like using a two Hydraulic lifting mechanism for a chair or the like using a two

1985-08-29

1986-06-03

McCall, James T.

Chairs and seats

Movable bottom

Interconnected with back for relative concurrent movement

108147, 248404, 297349, A47C 102

Patent

active

045925909

ABSTRACT:
A hydraulic lifting mechanism for an article of furniture including a refrigerant containing reservoir. The mechanism includes a flexible bag having a variable volume and fixed volume reservoir including a diaphragm for dividing the reservoir into two chambers. The first chamber contains hydraulic liquid and the second chamber contains a compressed two phase working fluid. The hydraulic liquid may be transferred between the flexible bag and the first chamber. A control valve mechanism is included in the flexible conduit which connects the flexible bag with the first chamber. The mechanism may be used in combination with a chair to provide an adjustable height control for the seat of the chair or in combination with other articles of furniture.

REFERENCES:
patent: 1651506 (1923-04-01), Berninghaus
patent: 2490823 (1949-12-01), Manning
patent: 2906095 (1959-09-01), Whitehead, Jr.
patent: 2961033 (1960-11-01), Galbraith
patent: 3005444 (1961-10-01), Steibel
patent: 3143332 (1962-02-01), Watlington
patent: 3226931 (1966-01-01), Bauer
patent: 3286970 (1966-11-01), Nolon
patent: 3381926 (1966-10-01), Fritz et al.
patent: 3594040 (1968-12-01), Monroe
patent: 4074887 (1978-02-01), Hale
patent: 4139175 (1979-02-01), Bauer
patent: 4445671 (1984-05-01), Reuschenbach et al.

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