Crane

Details Crane Crane

1987-02-19

1988-11-08

Basinger, Sherman D.

Traversing hoists

Having counterweight or counterbalancing means

Counterweight movable relative to load support

212159, 254900, B66C 2353

Patent

active

047829613

ABSTRACT:
A crane is provided which comprises a hoisting mechanism, which comprises a hoisting rope and a hoisting rope winch. A winch drive for the hoisting rope or a torque-limiting coupling connected between said winch drive and said winch is so controlled that in a period of time which preferably exceeds one second to the rope-pulling force exerted on the hoisting rope is increased in steps or continuously to a value which corresponds to the weight of the load or is sufficient to hoist the load, and that the winch is adapted to be rotated in a payout sense by opposing forces which tend to pull the hoisting rope from the winch and which exceed the instantaneous rope-pulling force.

REFERENCES:
patent: 3799505 (1974-03-01), Duncan
patent: 3946559 (1976-03-01), Stevenson
patent: 3957161 (1976-05-01), Tax
patent: 4025055 (1977-05-01), Strolenberg
patent: 4180171 (1979-12-01), Cunningham et al.
patent: 4304337 (1981-12-01), Dummer

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