CHRISTOPHER WADE HART
Pilots at Roy St, Houston, TX

6460634, Oct 8, 2002

Sep 14, 2000

09/661687

Christopher A Hart - Houston TX 77032
David Cannan - Houston TX 77032

E21B 1914

175 85, 166 775, 81 5716

A pipe clamp for use in oil field operations is provided. The pipe clamp is particularly useful where pipe, casing or tubing must be grasped firmly. The pipe clamp is designed to be safer than existing technology by incorporating a lighter weight design that is self aligning and can be controlled from a relatively remote location. The pipe clamp is comprises a gripping head which wraps around the pipe, an actuator extending radially from the gripping head, and a chain wrapped around the gripping head and connected to a mount located at the radially distant end of the actuator. As the actuator extends, it increases the distance between the gripping head and the mount, thus the chain tightens the friction surfaces of the gripping head about the pipe.

6138776, Oct 31, 2000

Jan 20, 1999

9/234333

Christopher A. Hart - Houston TX
David N. Cannan - Houston TX

E21B 1914

175 85

A pipe handling system comprises a rig floor supported frame adapted to be positioned above the rotary table and in alignment with the hole in the rotary table. It incorporates a centrally located bowl lined with the frame to enable a string of pipe to extend through the rotary table. Appropriate releasable slips are moved into and out engagement. The frame supports an overhead mounting plate, and one version thereof it incorporates hydraulic jacks to raise and lower the mounting plate. The mounting plate supports a horizontally directed hydraulic ram which moves the two end lengths of a long multi length chain looped into a bight to go around a pipe passing near the end of the mounting plate. The bight in the chain grips the coupling of the pipe to hold it fast. This mechanism cooperated with an overhead power tong assembly to enable threading or unthreading of pipe casing and tubing.