Joy Manufacturing Company

James F Ordway

Edward A Bailey

David C Langevin

A dual bushing centralizer is provided for a rock drill. The one bushing is provided for stabilizing the rock bit and a second bushing is provided which stabilizes the drill rod. An elastomeric stinger encapsulates both bushings and also provides a noise reduction seal around the drilled hole.

Dual bushing centralizer

A drilling apparatus including improved means for drill string manipulation for effecting an improved method of drill steel breakout and disassembly.

Drilling apparatus and method

A drilling apparatus adapted to have a drill string releasably secured thereto and including improved means for selectively locking such a drill string against axial rotation.

Drilling apparatus

A drill steel of the type employed in rock drilling and more particularly a drill steel having improved stress distribution and relief means.

Drill steel

An automatic control system for an adjustable, power operated drill string centralizer.

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West Lebanon, NH, United States of America

James F Ordway