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Design of a Quiet Rock Drill. A Feasibility Study Using Principles of Leavell Pavement Breaker.

Authors
Anderson-FR; Shaikh-N
Source
NTIS: PB/274-402 Available for Reference At Bureau Libraries :41 pages
Link
NIOSHTIC No.
10000171
Abstract
This report shows the feasibility of a quiet stopper for drilling roof bolts in coal mines. The work is directly applicable to pneumatic percussive rock drills. The report shows an oscillator based on patented leavell concepts which results in a vibration-free tool and noiseless exhaust. The dynamics of the oscillator are analyzed. Independant rotation of drill rod is provided by an air motor (screw expander), and flushing of cuttings is accomplished by an air ejector in a compact lower housing. The feasibility of no exhaust noise, low drill machine noise, and vibration-free casing is discussed.
Publication Date
19770101
Document Type
CP; Final Contract Report;
Fiscal Year
1977
NTIS Accession No.
PB-274402
NTIS Price
A04
Identifying No.
OFR 162-77
NIOSH Division
PRC;
Source Name
NTIS: PB/274-402 Available for Reference At Bureau Libraries
Performing Organization
Vast Research Company
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