Rock drilling tool

Details Rock drilling tool Rock drilling tool

1979-02-15

1981-06-30

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Bit with leading portion forming smaller diameter initial bore

175410, E21C 1308

Patent

active

042757967

ABSTRACT:
A central pilot shaft having a cutting member at its end protrudes forward rom the axis of a circular bracket disc which has a plurality of cutting members arranged on its periphery. An exhaust channel permits removing fine particles from in front of the bracket disc.

REFERENCES:
patent: 1351003 (1920-08-01), Pace
patent: 2759705 (1956-08-01), Bjorkman
patent: 3321034 (1967-05-01), Webb
patent: 3469641 (1969-09-01), Reynolds
patent: 3960223 (1976-06-01), Kleine

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