Methods and apparatus for controlling an hydraulic cylinder

Details Methods and apparatus for controlling an hydraulic cylinder Methods and apparatus for controlling an hydraulic cylinder

1975-12-17

1978-09-12

Schwadron, Martin P.

Motors: expansible chamber type

Independently operated timer, delay, pattern or cyclic control

Of independently movable working members

91 35, 91168, 91189R, 91393, 91471, 307144, F15B 2102

Patent

active

041128230

ABSTRACT:
Automated control apparatus for an intermittently extended hydraulic cylinder is disclosed which governs cylinder elongation such that the rate of elongation is essentially constant with respect to time. The control apparatus includes a preset continuously variable timer that regulates the timer interval between sequential length increments of the cylinder. The control apparatus also includes a second timer which is responsive to the timer interval interposed by the first timer and which operates a valve controlling communication of hydraulic fluid between a hydraulic cylinder and a pump. The second timer may be discretely variable so that one of a plurality of predetermined length increments can be selected. Alternatively, the second timer may adjust the time period during which the valve is opened such that successive stages of a telescopic hydraulic cylinder have equal length increments.

REFERENCES:
patent: 2939953 (1960-06-01), Parsons
patent: 3169450 (1965-02-01), Kohl
patent: 3306320 (1967-02-01), Bond
patent: 3502269 (1970-03-01), Robertson
patent: 3552253 (1971-01-01), MacDonald
patent: 3590582 (1971-07-01), German
patent: 3737143 (1973-06-01), Hodler
patent: 3872876 (1975-03-01), Bachman
patent: 3889415 (1975-06-01), Holmes
patent: 3965797 (1976-06-01), Grisebach

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