Boring or penetrating the earth – Bit or bit element – Impact or percussion type
Patent
1992-02-27
1993-12-14
Neuder, William P.
Boring or penetrating the earth
Bit or bit element
Impact or percussion type
175427, E21B 1058
Patent
active
052693872
ABSTRACT:
This mine roof tool bit insert, formed from a flat elongated body, provides opposed side faces, opposed end faces, a bottom face, opposed top faces and opposed intermediate faces disposed between associated top faces and end faces, the body forming identical halves rotating about a central axis. Each half includes a top cutting edge an intermediate cutting edge and end cutting edge. The top face, intermediate face and end face are planar and are rearwardly inclined to provide a constant relief angle. The intermediate cutting edge is inclined relative to a plane normal of the axis of rotation at an angle greater than that of the top cutting edge. The method of drilling a hole in a mine roof using a bit insert of this character includes positioning the insert, rotating the insert at about 200 to 1000 rpm and applying a thrust of about 1000 to 8000 lbs. to the insert.
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Neuder William P.
Tungco, Incorporated
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