Measuring and testing – Testing by impact or shock – Specimen impactor detail
Patent
1977-11-03
1979-06-12
Ruehl, Charles A.
Measuring and testing
Testing by impact or shock
Specimen impactor detail
73 82, G01N 330
Patent
active
041576551
ABSTRACT:
A coal-shale interface detection system for use with coal cutting equipment consisting of a reciprocating hammer having an accelerometer mounted thereon to measure the impact of the hammer as it penetrates the ceiling or floor surface of a mine. Additionally, a pair of reflectometers simultaneously view the same surface, and the outputs from the accelerometer and reflectometers are detected and jointly registered to determine when an interface between coal and shale is being cut through.
REFERENCES:
patent: 2944804 (1960-07-01), Persson et al.
patent: 3333893 (1967-08-01), Heimaster
patent: 3759085 (1973-09-01), Wilson et al.
Campbell Richard A.
Hudgins Jerry L.
Morris Paul W.
Reid, Jr. Harry
Zimmerman Joe E.
Manning John R.
Porter George J.
Ruehl Charles A.
The United States of America as represented by the Administrator
Wofford, Jr. L. D.
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