Measuring and testing – Testing by impact or shock – Specimen impactor detail
Patent
1977-11-03
1980-04-01
Ruehl, Charles A.
Measuring and testing
Testing by impact or shock
Specimen impactor detail
73 82, G01N 348
Patent
active
041955129
ABSTRACT:
A coal-shale interface detector 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: 3759085 (1973-09-01), Wilson et al.
patent: 4034603 (1977-07-01), Leeb et al.
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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