Crane trim, list, skew and snag protection system

Details Crane trim, list, skew and snag protection system Crane trim, list, skew and snag protection system

2008-11-13

2009-06-30

Brahan, Thomas J. (Department: 3654)

Traversing hoists

Traveling bridge

Bridge mounted motor for load lifting

C212S274000

Reexamination Certificate

active

07552829

ABSTRACT:
The present invention utilizes a hoist drum with a number of different diameter sections upon which the different ends of a lifting cable simultaneously spool on and off of as a function of counterclockwise and clockwise cable spooling. This combination reduces the amount of shaft torque required to raise or lower a load while increasing the number of hoist drum rotations required to raise or lower that load. These two features are incorporated into the operation of a main crane cable length adjusting device since they offer precise and rapid adjustment capabilities to be made with smaller sized electric motors and clutches.

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patent: 7500575 (2009-03-01), Zhang
patent: 2006/0085118 (2006-04-01), Baldwin
patent: 933614 (1982-06-01), None

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