Drilling rigs
OwnerJoseph Reginald Benjamininventor
Life of this patent
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Abstract
A drilling rig assembly mounted on a pile, the store for drill strings to be used in drilling being in the form of a carousel mounted concentric with the pile.
Claims4
A drilling rig assembly comprising a drilling platform mounted on the casing of a pile through which drilling may be performed, storage means for elements of a drill string and lifting means on said platform for lifting said elements and transferring them to a bore within said pile, wherein said storage means comprises a rotatable cage mounted on said casing below said platform to rotate about the axis of said casing, said cage being arranged to carry a plurality of said elements located parallel to said axis, and means for rotating said cage to bring a selected element to a position in which it can be lifted by said lifting means.
Dependencies are inferred from the claim text.