Implements or apparatus for applying pushing or pulling force – Apparatus for hauling or hoisting load – including driven... – Device includes rotatably driven – cable contacting drum
Patent
1986-02-06
1987-08-25
Levy, Stuart S.
Implements or apparatus for applying pushing or pulling force
Apparatus for hauling or hoisting load, including driven...
Device includes rotatably driven, cable contacting drum
254371, 242117, B66D 130
Patent
active
046887652
ABSTRACT:
The present invention is an improved winch drum design which improves the gripping action of the drum on a rope by departing from the traditional belt-pulley theory. The winch drum has a series of depressions at spaced intervals around the circumference of the drum. The portion of the drum between the depressions is smooth, producing a low coefficient of friction with the rope. The rope deforms as it bends over a portion of the drum between depressions at a relatively sharp angle, causing the rope to resist lengthwise movement. At the same time, the smooth surface allows the rope to easily move parallel to the spin axis of the drum, thereby facilitating the necessary climbing action of the rope from working to tailing ends. The gripping action is provided because the rope is compressed and bent between depressions, thereby making it difficult for the uncompressed portion of the rope resting over a depression to propagate lengthwise of the rope. In the preferred embodiment, the depressions do not extend to a portion of the drum adjacent a belled climbing portion of the winch.
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Levy Stuart S.
Matecki Katherine
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