Winches for the control of lifting equipment of the crane, overh

Details Winches for the control of lifting equipment of the crane, overh Winches for the control of lifting equipment of the crane, overh

1977-03-18

1979-04-10

Hohauser, Herman J.

Electricity: motive power systems

Motor-reversing

Field circuit control

310 95, B66D 150

Patent

active

041491157

ABSTRACT:
The invention is an improved control mechanism for winches as used on cranes and similar devices having a single motor driving the shaft of a winch drum through a pair of eddy current clutches. Gear trains attached to the two clutches are operative to drive the drum's shaft in opposite directions. An electronic control generates an output signal indicative of a commanded speed and direction of drum rotation while a tachometer generates a signal indicative of the actual speed and direction of drum rotation. The electronic control system compares the commanded and actual speed as well as the direction of rotation and generates signals energizing the two clutches. The combined action of the two clutches stabilizes the rotational speed of the drum and its direction of rotation in accordance with the commanded input.

REFERENCES:
patent: 3477695 (1969-11-01), Noly

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