Boom extension for gantry cranes
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United States of America Patent
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-
Nov 30, 1993
Grant Date -
N/A
app pub date -
Aug 11, 1992
filing date -
Aug 11, 1992
priority date (Note) -
Expired
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Abstract
An apparatus and method for providing a boom extension for retractable booms of gantry cranes which does not require lowering the boom during attachment of the extension, or increasing the lift capacity of the boom hoist machinery, nor does the boom extension add bending moment to the retractable boom.
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