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Longer-than-seam-height Drill Development Program.

Authors
Derby-GK; Bevan-JE
Source
NTIS: PB 280 077 :16 pages
Link
NIOSHTIC No.
10001246
Abstract
Five different types of drilling systems were developed under the flexible drill program that was initiated by the federal Bureau of Mines to protect roof bolter operators. The systems were designed for underground coal mines with seams as low as 30 inches, and with roof bolts longer than the height of the seam opening. Four of the developed systems were true flexible drills; the fifth was a remote- controlled, automatic rod changer concept. Only two of the five firms successfully completed testing requirements under the original contracts: Bendix Corp., with a true-flex drill; and Ingersoll-Rand Research, Inc., with the rod changer concept. The Bendix drill was rated best, and the Ingersoll-Rand drill was rated second. Because of the closeness of the ratings and the vast differences in the two development concepts, both systems had sufficient potential to justify further development funding for design updating and testing. Also, both systems warranted consideration for inclusion into other ongoing development projects under both safety and energy directed programs.
Publication Date
19780101
Document Type
IH; Report of Investigations
Fiscal Year
1978
NTIS Accession No.
PB-280077
NTIS Price
A03
Identifying No.
RI 8273
NIOSH Division
SRC;
Source Name
NTIS: PB 280 077
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