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Concentric wrench for blind access opening in a turbine

United States Patent

November 27, 2001
View the Complete Patent at the US Patent & Trademark Office
The concentric wrench includes an outer tube having flats at one end and a gripping surface at an opposite end. An inner tube has interior flats at one end and a gripping surface at its opposite end. With the inner and outer tubes disposed about a pressure transmitting conduit, the tubes may be inserted into a blind access opening in the outer turbine casing to engage the flats of the tubes against hex nuts of an internal fitting. By relatively rotating the tubes using the externally exposed gripping surfaces, the threaded connection between the parts of the fitting bearing the respective hex nuts can be tightened or loosened.
Laurer; Kurt Neal (Saratoga Spring, NY), Drlik; Gary Joseph (Fairfield, OH), Gibler; Edward Eugene (Cincinnati, OH)
General Electric Company (Schnectady, NY)
09/ 523,964
March 13, 2000
This invention was made with Government support under Contract No. DE-FC21-95MC31176 awarded by the Department of Energy. The Government has certain rights in this invention.