Crane safety device

Details Crane safety device Crane safety device

1979-01-12

1981-02-24

Sheridan, Robert G.

Traversing hoists

With haul-in line

212153, B66C 2388

Patent

active

042522439

ABSTRACT:
A crane has a hoist rope which passes over a boom to a drum driven by a hudraulic motor and including a brake. The crane includes means for releasing the brake when the free end of the rope is a given distance below the crane, and has means for relieving hydraulic pressure from the motor in response to the horizontal radius of the free end of the rope so that at a given radius the motor can lift only a given maximum load.

REFERENCES:
patent: 3035712 (1962-05-01), Nowack
patent: 4109798 (1978-08-01), Alastair

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