Raise-boring

Details Raise-boring Raise-boring

1978-01-19

1980-03-04

Pate, III, William F.

Boring or penetrating the earth

Enlargement of existing pilot throughbore requiring...

173 33, 173 36, 299 55, E21D 300

Patent

active

041912675

ABSTRACT:
A drill hole in a rock body is collared by drilling a pilot hole into a tunnel, advancing the pilot drill across the tunnel to drill a hole in the opposite wall of the tunnel aligned with the pilot hole, mounting the borer head on an arbor located across the tunnel in both holes, rotating the borer head to collar the hole, and detaching the borer head from the arbor.

REFERENCES:
patent: 2837324 (1958-06-01), Aschacken
patent: 2839271 (1958-06-01), Kandle
patent: 3162254 (1964-12-01), Rose
patent: 3231029 (1966-01-01), Winberg
patent: 3280416 (1966-10-01), Forsyth
patent: 3386520 (1968-06-01), Lawrence et al.
patent: 3399738 (1968-09-01), Haspert
patent: 3411826 (1968-11-01), Wallers et al.
patent: 3894402 (1975-07-01), Cherrington

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