Lifting device with counterweight

Details Lifting device with counterweight Lifting device with counterweight

1998-06-29

1999-08-10

Brahan, Thomas J.

Traversing hoists

Having counterweight or counterbalancing means

Counterweight movable relative to load support

B66C 2372

Patent

active

059344911

ABSTRACT:
A lifting device which includes a frame and an elongated boom having a lower end pivotally connected to the frame along a pivot axis. The lower end of the boom has a counterweight connected thereto offset from the pivot axis. The counterweight has a center of gravity which is movable with respect to the pivot axis of the boom. The counterweight can be freely pivotal, fixed, or partially fixed with respect to the boom. When linkage is provided between the counterweight and the boom, the counterweight can be rolled or tilted so as to move the counterweight center of gravity with respect to the pivot axis of the boom.

REFERENCES:
patent: 252672 (1882-01-01), Jewett
patent: 1245186 (1917-11-01), Brothers
patent: 1497686 (1924-06-01), Johnson
patent: 2036386 (1936-04-01), Andersen
patent: 2198793 (1940-04-01), Schroeder
patent: 2364493 (1944-12-01), Ulinksi
patent: 3362432 (1968-01-01), Jameson
patent: 3513997 (1970-05-01), Heyer et al.
patent: 4476955 (1984-10-01), Carter

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