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

1992-10-22

1994-12-27

Dang, Hoang C.

Boring or penetrating the earth

Bit or bit element

Impact or percussion type

175426, E21B 1046

Patent

active

053756720

ABSTRACT:
An insert for use in a roof bit for drilling bolt holes in a mine roof includes a pair of cutting edges interconnected by a chisel edge. Each cutting edge is formed by an intersection of front and side faces of the insert. Each side face further includes at least one chamfer intersecting the respective cutting edge and the chisel edge to divide that cutting edge into inner and outer sections, each of which being sharper than the chisel edge.

REFERENCES:
patent: 2902260 (1959-09-01), Tilden
patent: 3049033 (1962-08-01), Benjamin et al.
patent: 4120601 (1978-10-01), Benjamin
patent: 4313506 (1982-02-01), O'Connell
patent: 4381162 (1983-04-01), Hosoi
patent: 4492278 (1985-01-01), Leighton
patent: 4984944 (1991-01-01), Pennington, Jr. et al.
patent: 5172775 (1992-12-01), Sheirer et al.
patent: 5184689 (1993-02-01), Sheirer et al.
patent: 5220967 (1993-06-01), Monyak

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