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

2009-12-01

Brahan, Thomas J. (Department: 3654)

Traversing hoists

Traveling bridge

Bridge mounted motor for load lifting

Reexamination Certificate

active

07624883

ABSTRACT:
The present invention utilizes a hoist drum with a three different drum sections, two cylindrical and one tapered, 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.

REFERENCES:
patent: 523705 (1894-07-01), Grafton
patent: 1004451 (1911-09-01), McIntrye
patent: 2189447 (1940-02-01), Martin
patent: 2333092 (1943-11-01), Davidson
patent: 2401238 (1946-05-01), Goodman et al.
patent: 2495392 (1950-01-01), Smith
patent: 2589172 (1952-03-01), Wagner

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