Rotary crane

Details Rotary crane Rotary crane

1983-03-01

1984-05-08

Blix, Trygve M.

Traversing hoists

Having means facilitating assembly or disassembly

Of traversing hoist from support

212199, 212239, 212232, B66C 2342, B66C 2302

Patent

active

044469756

ABSTRACT:
A rotary crane having a telescopic mast with a liftable upper portion and a boom pivotally mounted at the end of that portion. The boom includes an end hinged element, a hinged tip and an intermediate member between the end element and the tip. Each portion of the boom is of a triangular shape and has two lower chords and one upper chord interconnected by rods. The boom is foldable and expandable by a rope system which includes boom supporting ropes and a boom folding rope. The end hinged element is connected to the intermediate member by a shackle having an oblong opening into which a pin is inserted to pivotally connect the end element to the intermediate member.

REFERENCES:
patent: 3161299 (1964-12-01), Noly
patent: 3233375 (1966-02-01), Durand
patent: 3378147 (1968-04-01), Marrie
patent: 4267934 (1981-05-01), Vernay

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