Rock drill with hard metal drilling head

Details Rock drill with hard metal drilling head Rock drill with hard metal drilling head

1978-07-31

1980-05-13

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

With helical-conveying portion

173DIG2, 175398, 175405, E21C 1308

Patent

active

042024200

ABSTRACT:
A rock drill for rotary blow drilling with a drilling head arranged at the free end of the drill shaft, which at least partially consists of hard metal. The drilling head the end face of which is circular disc shaped or circular ring shaped includes a formed piece of solid hard metal. Cutting bodies are machined out of the end of this piece of hard metal which cutting bodies have the shape of pyramids or truncated pyramids and taper with increasing distance from the drill shank.

REFERENCES:
patent: 609107 (1898-08-01), Leyner
patent: 1156147 (1915-10-01), Karns
patent: 1554446 (1925-09-01), Loy
patent: 1561975 (1925-11-01), Des Roches
patent: 1697570 (1929-01-01), Mecom
patent: 1939991 (1933-12-01), Krusell
patent: 2593229 (1952-04-01), Wallace
patent: 2673716 (1954-03-01), Avery
patent: 2729427 (1956-01-01), Davis et al.
patent: 2883155 (1959-04-01), Gehrke
patent: 3537538 (1970-11-01), Generoux
patent: 4114322 (1978-09-01), Greenspan

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