Apparatus for drilling hard material

Details Apparatus for drilling hard material Apparatus for drilling hard material

1980-12-15

1983-10-18

Novosad, Stephen J.

Boring or penetrating the earth

Enlargement of existing pilot throughbore requiring...

175 96, 299 62, E21B 100, E21B 414, E21B 416, E21B 420

Patent

active

044100531

ABSTRACT:
A method for drilling hard material such as rock by fragmenting the rock by impact in selected spaced-apart areas and simultaneously fragmenting the rock by shear between the selected areas. The invention also covers a drill head with particularly arranged impact hammers for carrying out the method, and a drill unit incorporating the drill head.

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patent: 2942850 (1960-06-01), Heath
patent: 3357507 (1967-12-01), Stewart
patent: 3387673 (1968-06-01), Thompson
patent: 3682258 (1972-08-01), Kelly, Jr. et al.
patent: 3917009 (1975-11-01), Dyer et al.

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