Traversing hoists – Having counterweight or counterbalancing means – Counterweight movable relative to load support
Patent
1981-07-31
1983-11-29
Blix, Trygve M.
Traversing hoists
Having counterweight or counterbalancing means
Counterweight movable relative to load support
405196, 405200, 212190, B66C 2352
Patent
active
044176643
ABSTRACT:
A method and apparatus for the mounting of lift cranes on jackup rigs, offshore platforms, and like offshore structures provides a first static bearing race portion which is mounted upon the jacking structure, for example, of a jackup rig surrounding the telescoping leg associated therewith. On offshore platforms, a vertical leg portion of the jacket can be extended vertically with the static bearing race portion being affixed to the extended vertical jacket leg. A second movable bearing race portion is attached to the static race portion with a plurality of bearings therebetween allowing the first and second bearing race portions to rotate with respect to one another. The crane is then supported on the upper bearing race portion with the telescoping leg of the jackup rig or offshore jacket structure passing through both bearing race portions, the crane structure unencumbering vertical movement of the leg in the case of a jackup rig.
REFERENCES:
patent: 1551768 (1925-09-01), Otis
patent: 1706441 (1929-03-01), Daughs
patent: 4011955 (1977-03-01), Morrow, Sr. et al.
patent: 4310277 (1982-01-01), Robinson
patent: 4359164 (1982-11-01), Triplett
Blix Trygve M.
Brahan Thomas J.
Garvey Charles C.
Nautilus Crane & Equipment Corporation
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