Mine roof drill bit and cutting insert therefor

Details Mine roof drill bit and cutting insert therefor Mine roof drill bit and cutting insert therefor

1993-07-28

1998-11-03

Dang, Hoang C.

Boring or penetrating the earth

Bit or bit element

Impact or percussion type

175427, E21B 1058

Patent

active

058295402

ABSTRACT:
A rotary roof mine bit for drilling holes in the roof of a mine, comprises a bit body and an insert mounted in the bit body. The insert is formed of a hard material such as carbide or diamond. A top surface of the insert comprises two top sections which intersect a respective main surface of the insert to define first and second non-linear cutting edge. In one embodiment each cutting edge comprises a plurality of mutually angled segments. In another embodiment each cutting edge is continuously curved. Preferably an axial notch is disposed at a center of the top surface.

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