A feature in the design of J. R. Clancy's PowerLift automated hoist has been issued U. S. Patent 7,766,308. Within the hoist, the use of a sliding drum on a fixed shaft creates a zero fleet angle as the lift lines leave the drum. The more efficient functioning of the drum and shaft reduces both size and maintenance requirements. While the sliding drum is a new development, zero fleet angle hoists are not new. The company says it began building and marketing zero fleet angle hoists in the 1960s using the Izenour hoist design.
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