Crane
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United States of America Patent
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-
Nov 8, 1988
Grant Date -
N/A
app pub date -
Feb 19, 1987
filing date -
Feb 19, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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