Height-adjustable hoist

Details Height-adjustable hoist Height-adjustable hoist

1978-06-26

1980-12-30

Spar, Robert J.

Traversing hoists

Having vertically swinging boom

414541, B66C 2336, B66C 2362

Patent

active

042418380

ABSTRACT:
A height-adjustable hoist having an upright post, a tip member extensible therefrom, and a sleeve swivelable about the axis of the post. A hoist arm is pivotally mounted at one of its ends on the sleeve for pivoting in a substantially upright plane between raised and lowered positions. A nonextensible chain extending from the other end of the hoist arm to the tip member is adjustably anchored to the tip member by a chain-engaging lock. To set the hoist arm at a desired raised position, the tip member is extended and the chain is selectively anchored to the tip member, with the chain stretched between the hoist arm and tip member.

REFERENCES:
patent: 2799402 (1957-06-01), Norman
patent: 2804216 (1957-08-01), Farnam
patent: 2940621 (1960-06-01), White
patent: 3019918 (1962-02-01), Keener
patent: 3578179 (1971-05-01), Fujioka
patent: 3978989 (1976-09-01), Avila

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