Power lowering system

Details Power lowering system Power lowering system

B - Operations, Transporting

66

D

254/89

B66D 1/50 (2006.01) B66D 1/44 (2006.01)

Patent

CA 1049489

ABSTRACT OF THE DISCLOSURE A power lowering system for a hoist drum including a hydraulic motor for rotating the drum in a lowering direction and hydraulic feedback means connected to a modulated torque converter for automatically applying opposing torque to the drum when heavy loads are lowered. A variable displacement pump supplies hydraulic fluid to the motor so that the load is lowered at a rate determined by the displacement of fluid supplied to the motor. A flow restriction is provided in the feedback means to the torque converter actuator to dampen cyclical variations in the application of opposing torque. Multiple hoist drums may be automatically clutched to the hydraulic motor and torque converter when separate manual control levers are initially moved in either the hoisting or lowering direction and an automatic brake release may also be employed.

260839

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