Hoist for use at a manhole

Details Hoist for use at a manhole Hoist for use at a manhole

1988-02-16

1989-06-13

Basinger, Sherman D.

Traversing hoists

Having horizontally swinging boom or bridge

Having fluid ram directly actuating load cable or sheave...

212223, 212229, 212244, 212253, 182 3, B66C 2318

Patent

active

048384399

ABSTRACT:
A hoist for use over a man hole includes a H shaped base part defining two side struts and a cross strut offset toward one end of the side struts. The base part has four legs arranged at the ends of the side struts, adjustable in height and terminating in a flat pad for engaging the ground. A vertical sleeve part extends upwardly from the cross strut for receiving a swivel arm which is a separate item and can be inserted into the sleeve part for swivelling movement about a vertical axis. A swivel arm includes a jib portion extending out over the larger area defined forwardly of the cross-strut. Swivelling movement is limited to the forward area.

REFERENCES:
patent: 81317 (1868-08-01), Williams
patent: 212384 (1921-07-01), Manley
patent: 935413 (1909-09-01), Ryan
patent: 1517562 (1924-12-01), Ljungman et al.
patent: 1887965 (1932-11-01), Stoner
patent: 1978999 (1934-10-01), Jones
patent: 2433921 (1948-01-01), Nelson
patent: 3794296 (1974-02-01), Hasstedt
patent: 4030705 (1977-06-01), Bontrager
patent: 4050587 (1977-09-01), Moen
patent: 4305478 (1981-12-01), Geisinger
patent: 4660679 (1987-04-01), Ostrobrod
"The Shop Dolly" in Pacific Electric Cranes, 3/25/69.

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