Constant balance crane

Details Constant balance crane Constant balance crane

1976-08-13

1978-09-12

Sheridan, Robert G.

Traversing hoists

Overhead

212 48, 212 63, B66C 1900

Patent

active

041131126

ABSTRACT:
A constant balance crane has a control tower and a plurality of gantry members mounted on the tower between its base and its upper section. Trolleys on the gantries are movably mounted, and a lift mechanism is provided on at least one trolley. On at least one other trolley a counterweight is carried. The lift and counterweight trolleys are propelled on the gantries by a hydraulic system or the like which is partially manual and partially automatically responsive to the downward moments on the gantry to adjust the counterweight trolley to a load balancing position, and to continuously adjust the counterweights relative to the load such that constant balance is maintained. In modified embodiments, the counterweight trolley travels in a horizontal plane that is vertically spaced from the plane of travel of the load trolley.

REFERENCES:
patent: 219691 (1879-09-01), Coudaint-Gougeul
patent: 654739 (1960-07-01), Lancaster
patent: 734974 (1903-07-01), Shoosmith
patent: 3240353 (1966-03-01), Leavesley
patent: 3642148 (1972-02-01), Durand
patent: 3752326 (1973-08-01), Levingston

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