Tesco Corporation

Per G Angman

Tommy M Warren

Robert M Tessari

Matthew Brown

Jens Lutzhöft

William Carr

Gustavo Adrian Lis

Hans-Jurgen Ulbrich

An elevator mechanism for use on drilling rigs for hoisting and lowering different sizes and types of pipe. At least two elevator frame sections are interconnected in relative moveable relation for movement between an open position for receiving a section of pipe and a closed position clamping about the pipe. At least two pipe clamping inserts being received in interengaged relation by respective elevator frame sections in a manner resisting upward and downward movement relative to the frame sections. The pipe clamping inserts are mechanically interengaged with the elevator sections to prevent inadvertent disassembly downward and are releaseably locked to secure the inserts against rotation relative to the frame sections. For assembly and disassembly of the inserts relative to the frame sections, the inserts, when unlocked, are rotated for engagement or separation of the mechanically interengaged relation.

Drilling rig elevator with replaceable clamping inserts and method for

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CA

Per G Angman