Hydraulically operated bridge crane
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United States of America Patent
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-
Mar 15, 1988
Grant Date -
N/A
app pub date -
Dec 15, 1986
filing date -
Dec 15, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A bridge-crane structure wherein major structural components to sustain loads imposed upon the span are also major functional components of hydraulically controlled hoist mechanism of the crane. Specifically, closed upper and lower elongate cylinders are rigidly laced by struts to define a bridge girder, of length corresponding to the length of the bridge; and these cylinders are charged with gas at elevated pressure and interconnected as major components of a hydraulic accumulator relied upon as a phantom counterweight in the hydraulic hoist mechanism.
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