Hydraulic cylinder extension control

Details Hydraulic cylinder extension control Hydraulic cylinder extension control

1975-04-21

1977-12-13

Schwadron, Martin P.

Motors: expansible chamber type

Working member position responsive motive fluid control

Venting expanding chamber

91450, 91459, 187 17, 318481, F15B 1522

Patent

active

040622690

ABSTRACT:
A hydraulic circuit for operator pre-selection in one exemplary embodiment of the extension of a lift truck upright which utilizes a fixed displacement hydraulic motor operating to adjust either a rotary switch or a potentiometer which is connected to a valve for interrupting the flow to the lift cylinder of the upright at the pre-selected height. The adjusted position of an operator's lift height selector is coordinated with the rotary switch or potentiometer or to effect the selected extension of the upright.

REFERENCES:
patent: 2331108 (1943-10-01), De Ganahl
patent: 2665122 (1954-01-01), Rowland
patent: 3200832 (1965-08-01), Adams
patent: 3583220 (1971-06-01), Kawakami
patent: 3659655 (1972-05-01), Gyongyosi
patent: 3700994 (1972-10-01), Gopfert
patent: 3704405 (1972-11-01), Miller, Jr.
patent: 3727520 (1973-04-01), McKnown
patent: 3776099 (1973-12-01), Knutson
patent: 3782248 (1974-01-01), Fuzzell
patent: 3782250 (1974-01-01), Kiszewski
patent: 3813990 (1974-06-01), Coppola

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