Title: Raise-boring

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.

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Inventors: Snaddon, Michael B.

Application Number: 870809
Filing Date: 1978-01-19
Publication_date: 1980-03-04
Assignee:
Primary Class(es): 175/53 173/33, 173/36, 299/55
Other Classes:
US Patent Ref:

2837324	Jun, 1958	Aschacken	299/55.
2839271	Jun, 1958	Kandle	173/36.
3162254	Dec, 1964	Rose	173/33.
3231029	Jan, 1966	Winberg	175/53.
3280416	Oct, 1966	Forsyth	175/53.
3386520	Jun, 1968	Lawrence et al.	173/33.
3399738	Sep, 1968	Haspert	175/53.
3411826	Nov, 1968	Wallers et al.	299/31.
3894402	Jul, 1975	Cherrington	175/53.

Other Refs:
Primary Examiner: Pate, III, William F.
Assistant Examiner:
Attorney: Young & Thompson