Traversing hoists – With haul-in line
Patent
1987-08-10
1989-03-07
Basinger, Sherman D.
Traversing hoists
With haul-in line
212157, 212165, 250231SE, 340407, 340685, B66D 140
Patent
active
048098574
ABSTRACT:
A drum rotation indicator for indicating the speed of raising and lowering a load by a crane winch. A rate generator connected to the winch develops electrical pulses having a frequency proportional to winch rotational speed. A solenoid having a movable plunger is mounted in the cab of a crane where the vibration of the plunger can be sensed by a crane operator. Pulses from the rate generator are amplified and coupled to the solenoid to cause the plunger to vibrate at a rate corresponding to pulse frequency.
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Culler Paul T.
Drake Kelly
Steuck Roger A.
Basinger Sherman D.
Brahan Thomas J.
FMC Corporation
Guernsey L. B.
Kamp R. C.
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