Rock drill

Details Rock drill Rock drill

1989-05-31

1990-08-28

Novosad, Stephen J.

Boring or penetrating the earth

Bit or bit element

Nonsymmetrical bit

175394, 175400, 175410, 175415, B28D 114, B28D 702, E21B 1044, E21B 1058

Patent

active

049517619

ABSTRACT:
A rock drill having a drilling head which, in an asymmetric arrangement relative to the main cutting tip, has at least one additional secondary cutting tip, the angle enclosed between the single cutting edge of the main cutting tip and the secondary cutting tip being formed as an acute angle.

REFERENCES:
patent: 2507222 (1950-05-01), Phipps
patent: 3163244 (1964-12-01), Zimmerman
patent: 3294186 (1966-12-01), Buell
patent: 3845829 (1974-11-01), Schaumann
patent: 4696355 (1987-09-01), Haussmann

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