Blast hole grooving bit and wear resistant compact

Details Blast hole grooving bit and wear resistant compact Blast hole grooving bit and wear resistant compact

1980-09-24

1982-11-30

Pate, III, William F.

Boring or penetrating the earth

Bit or bit element

Noncutting portion forwardly of cutting portion

175389, E21B 1040

Patent

active

043611974

ABSTRACT:
A blast hole drill bit is disclosed for forming longitudinally extending grooves in already drilled blast holes, having a body with a forward face and a rearwardly extending pilot diameter. One or more radially extending wings are located at the rearmost part of the pilot diameter and are V-shaped when viewed in plan. Wear resistant compacts form a part of the wings and have a V-shaped cutting edge.

REFERENCES:
patent: 629145 (1899-07-01), Alnon
patent: 740906 (1903-10-01), Owen
patent: 1514156 (1924-11-01), Hancock
patent: 1631693 (1927-06-01), Richey
patent: 1941217 (1933-12-01), McKinless
patent: 2602640 (1952-07-01), Colley
patent: 2759705 (1956-08-01), Bjorkman
patent: 3277973 (1966-10-01), Eberman
"Field Evaluation of Fracture Control in Tunnel Blasting" Dec. 1979, NTIS, PB80-149297.

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