Control systems for hydraulically operated elements circuits or

Details Control systems for hydraulically operated elements circuits or Control systems for hydraulically operated elements circuits or

1979-06-12

1982-04-06

Jillions, John M.

Implements or apparatus for applying pushing or pulling force

Apparatus for hauling or hoisting load, including driven...

Device includes rotatably driven, cable contacting drum

43 9, 254291, B66D 108, B66D 150

Patent

active

043232221

ABSTRACT:
Method of controlling two separately operable hydraulic circuits involving monitoring the pressure conditions in one of the circuits, comparing this pressure with a reference pressure which is established in the control system to produce a first error signal which is used to correct if necessary the pressure within the one circuit. Performing the same operation in the case of the second circuit using the same reference pressure. In particular the system and apparatus of the invention is used for controlling the tensions in the warps of a trawl automatically throughout the shooting, trawling and hauling-in of a trawl.

REFERENCES:
patent: 4200052 (1970-04-01), Cunningham et al.

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