Chairs and seats – Movable bottom – Interconnected with back for relative concurrent movement
Patent
1984-11-05
1986-06-10
McCall, James T.
Chairs and seats
Movable bottom
Interconnected with back for relative concurrent movement
297DIG3, 297339, 108147, 248560, A47C 102
Patent
active
045939519
ABSTRACT:
A hydraulic lifting mechanism for an article of furniture comprising a pair of sealed chambers interconnected with a hollow conduit and containing hydraulic fluid. One of the chambers is expandable and comprises flexible walls in the form of a rolling diaphragm. The second chamber contains a pressurized gas in addition to a hydraulic fluid. The expandable chamber is located in the supporting base of the article of furniture. A two speed valve is included in the interconnecting conduit for allowing fluid transfer between the chambers at a first rate in one direction and at a second rate in the other direction. As fluid is transferred to the expandable chamber, a support column will be forced upwardly by the expanding chamber at a fast rate and when the fluid transfers from the expandable chamber to the second chamber the support column will move downwardly at a second rate of speed slower than the first rate. The second chamber and the control valve can be located remotely from the base of the article of furniture.
REFERENCES:
patent: 247142 (1881-09-01), Woods
patent: 1651506 (1927-12-01), 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 (1964-08-01), Watlington
patent: 3226931 (1966-01-01), Bauer
patent: 3286970 (1966-11-01), Nolan
patent: 3381926 (1968-05-01), Fritz et al.
patent: 3594040 (1971-07-01), Monroe
patent: 3861740 (1975-01-01), Tajima et al.
patent: 4074887 (1978-02-01), Hale
patent: 4124202 (1978-11-01), Hatakeyama
patent: 4139175 (1979-02-01), Bauer
patent: 4445671 (1984-05-01), Reuschenbach et al.
Slaats Mathew A.
Strange Patrick E.
Kimball International Inc.
McCall James T.
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