Marine cargo handling crane

Claim 1

A cargo handling crane mounted on the deck of a vessel comprising a fixed post located on the longitudinal centerline of the vessel, a gooseneck adjustably mounted on the said post, said gooseneck including a vertically disposed pivot pin and a horizontally disposed pivot pin on the said vertical pivot pin, a fixed outrigger extending outwards from opposite sides of the said post and disposed transversely of the vessel and having pulleys notatably supported at the extremities of said outrigger, a load carrying boom pivotally mounted on the said vertical pivot pin for topping of the boom and on said horizontal pivot for slewing of the boom, the said boom is in the form of an horizontally disposed diamond-shaped truss whose major axis is lengthwise of the boom in the direction away from the post and whose minor axis is at right angles to the said lengthwise direction of the boom midway of the length thereof, sLewing rope means for the said boom including pulleys at the extremities of the minor axis of the diamond-shaped truss boom, said slewing rope means passing over said pulleys on said fixed outrigger and said pulleys located on the minor axis of the load carrying boom, winch means to pay-in and pay-out the said slewing rope means, a hoisting trolley supporting a cargo hook and movable along the length of the said boom, means for moving the cargo hook vertically, said trolley including means for moving the cargo hook therewith along the length of the boom independent of the means for topping the boom or of the means for lifting the cargo hook and means for locking the said trolley in a selected position on the said boom.