Control arrangement, preferably for remote controlled, hydrostat

Details Control arrangement, preferably for remote controlled, hydrostat Control arrangement, preferably for remote controlled, hydrostat

1974-11-21

1976-03-16

Maslousky, Paul E.

Power plants

Pressure fluid source and motor

Servo-motor having externally operated control valve sets...

60446, 60905, 92131, F16H 3946

Patent

active

039437167

ABSTRACT:
The cable drum for the hoist cable of a hoisting device is driven by a hydraulic motor with a constant displacement that in its turn obtains drive fluid from a pump with a variable displacement. The displacement of the pump, and with that the speed and rotational direction of the cable drum, is operated by means of the rod of a piston in a double acting hydraulic cylinder, the piston being displaceable in the cylinder by means of pressure fluid, which pressure and direction of flow is adjustable by means of valves, which in their turn are operated electrically from a control lever. Movement of the piston rod is permanently counteracted by a friction means, such that the piston by the control lever can be brought to stop in steplessly optional positions, and thereby the cable drum can be brought to rotate with steplessly optional speeds, notwithstanding the pressure of the fluid acting on the piston is only adjustable to three different pressure levels (atmospheric pressure, lower over pressure and higher over pressure).

REFERENCES:
patent: 2092580 (1937-09-01), Kelly
patent: 2516662 (1950-07-01), Vickers et al.
patent: 2864239 (1958-12-01), Taylor
patent: 3713291 (1973-01-01), Kubik
patent: 3748857 (1973-07-01), Heiser

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