Rock drill

Details Rock drill Rock drill

1979-03-01

1981-03-31

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

With helical-conveying portion

175410, 175404, E21B 1044

Patent

active

042588081

ABSTRACT:
A rock drill, particularly for reinforced concrete, for rotary blow drilling, having one or several helical removal grooves for the removal of drill dust and a drill head furnished with a hard metal cutting ring is disclosed. In a preferred embodiment, the drill shaft is provided with a removal channel communicating the cutting ring head and a removal groove in the drill shaft surface.

REFERENCES:
patent: 218374 (1879-08-01), Fishburn
patent: 831056 (1906-09-01), Gilmore
patent: 1218579 (1917-03-01), Overman
patent: 1882906 (1932-10-01), Renfer
patent: 2579712 (1951-12-01), Tilden
patent: 2594256 (1952-04-01), Compton
patent: 2844358 (1958-07-01), Eberman et al.
patent: 3130763 (1964-04-01), Schlosser et al.
patent: 3216153 (1965-11-01), Saville et al.
patent: 3888320 (1975-06-01), Maxwell

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