Drill bits

Details Drill bits Drill bits

1976-05-17

1977-05-31

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Plural separable cutter elements

175419, E21C 1301

Patent

active

040263720

ABSTRACT:
Rotary percussive drill bits comprising a body having a longitudinal axis, side face, end face, and cutting inserts, arranged such that during rotary percussive drilling wear tends to take place over a clearance face of the insert thus preserving the leading cutting edge of the insert, wherein the inserts have a substantially flat leading face which projects axially fowardly of the body end face to communicate at the leading cutting edge with a clearance face, with the leading cutting edge extending radially outwardly beyond the side face of the bit body.

REFERENCES:
patent: 2179689 (1939-11-01), Earuheart
patent: 2800303 (1957-07-01), Dick
patent: 3163245 (1964-12-01), York

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