Boring or penetrating the earth – Bit or bit element – Bit with leading portion forming smaller diameter initial bore
Patent
1989-08-15
1990-04-17
Novosad, Stephen J.
Boring or penetrating the earth
Bit or bit element
Bit with leading portion forming smaller diameter initial bore
175394, 299 92, E21B 1044, E21B 1058, E21B 1062
Patent
active
049171968
ABSTRACT:
An excavating tooth for use in connection with an earth drilling auger includes a main body portion terminating in a working end and a shank extending upwardly from the main body portion. A plurality of tungsten carbide inserts are embedded in the working end of the tooth and project outwardly therefrom. During drilling operations, the carbide inserts engage the earth and chisel away rock and other material which is subsequently conveyed to the surface by the fight structure of the auger. The inserts are inclined forwardly with respect to the plane of the shank to enable the inserts to withstand greater loads than before. In the preferred embodiment, the insert has a generally cylindrical proximal end embedded in the working end of the auger tooth and a distal end including forward and rearward inclined surfaces terminating in a transverse cutting edge.
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"Texoma Auger Tooling Products", brochure, Reedrill, Inc., Sherman, Tex.
Beach Wayne H.
Rowlett Don C.
Shirk Steven D.
Stiffler Stephen P.
Kennametal Inc.
Meenan Larry R.
Novosad Stephen J.
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