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AssigneeNational Oilwell Varco, L.P.
InventorsJames William Weir, Frank Benjamin Springett, Travis James Miller
Estimating the term…
Cranes and crane systems with high capacity lifting capabilities, as well as versatility and relatively large operational areas. A crane of the present disclosure may have main boom pivotable about a substantially horizontal axis and a luffing assembly configured for luffing the boom about the axis. The main boom may be pivotable in both a forward luffing operation and a reverse or rearward luffing operation. In this way, the main boom may be operable within a range extending up to 180 degrees. Various adjustment mechanisms may be used to shift the main boom from a forward luffing operation to a reverse luffing operation. Additionally, a crane of the present disclosure may have a utility boom rotatable about a substantially vertical axis. The utility boom may allow for added lateral reach of the crane, thus further increasing the operational area of the crane.
A reverse luffing crane, comprising:
A shear leg crane, comprising:
A method of operating a shear leg crane having a crane boom pivotable about a substantially horizontal axis and a luffing assembly configured for pivoting the crane boom about the axis, the method comprising:
Dependencies are inferred from the claim text.