Collapsible frame support for pivotal boom on a portable crane

Traversing hoists – Having vertically swinging boom – And trolley

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Details

212186, 212190, 212191, 212192, 212198, 212206, 212224, 212225, 414138, 414143, B66C 700, B66C 2342, B66C 2352, B63B 3530

Patent

active

044807570

ABSTRACT:
A crane structure mounted on a transport vehicle, preferably a marine vessel, is disclosed. The crane structure includes a gantry structure mounted on a vertical tower structure and having boom portions protruding from the tower structure. Preferably, the boom portions may be pivotally lowered from their operating positions and the tower structure may be rotated in a horizontal plane, thereby reducing the overall dimensions of the crane structure to allow transport under overhead obstructions and through narrow passageways.

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