Mining or in situ disintegration of hard material – Automatic control; signaling or indicating – Of hard material disintegrating machine
Patent
1978-06-23
1980-03-11
Purser, Ernest R.
Mining or in situ disintegration of hard material
Automatic control; signaling or indicating
Of hard material disintegrating machine
250254, E21C 3508
Patent
active
041925505
ABSTRACT:
A method and apparatus for mining a desired geological strata, such as a coal seam, from surrounding undesired geological strata. A bore is formed in the coal seam in a first direction, and while progressively penetrating the coal seam with a mining machine, the distance of the mining machine from the undesired strata in a second direction perpendicular to the first direction is effectively measured. The measuring is accomplished by generating chips by boring upwardly through the coal seam toward and into the undesired strata, and reflecting light off of the chips, the difference in reflectivity between the chips from the coal and from the undesired stratum serving to indicate when the undesired stratum has been reached. The distance of upward movement of the drill from a reference until the reflectivity of the undesired stratum is detected is measured, or the thickness of the coal seam above the machine is measured, and the mining machine is controlled based upon such measurements. A single power source can be employed for both rotating the drill and reciprocating the drill in measured progress toward the undesired stratum.
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Coaltex, Inc.
Purser Ernest R.
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