E - Fixed Constructions – 21 – C
Patent
E - Fixed Constructions
21
C
262/81
E21C 35/08 (2006.01) E21C 27/24 (2006.01) E21C 35/24 (2006.01)
Patent
CA 1097701
GAUGING APPARATUS AND METHOD, PARTICULARLY FOR CONTROLLING MINING BY A MINING MACHINE Abstract of the Disclosure Apparatus for and method of controlling the mining by a mining machine of a seam of material (e.g., coal) overlying or underlying a stratum of undesired material (e.g., clay) to reduce the quantity of unde- sired material mined with the desired material, the machine comprising a cutter movable up and down and adapted to cut down into a seam of coal on being lowered. The control apparatus comprises a first electrical sig- nal constituting a slow-down signal adapted to be auto- matically operated to signal when the cutter has cut down into a seam of desired material generally to a pre- determined depth short of the interface between the seam and the underlying stratum for slowing down the cutting rate as the cutter approaches the interface, and a sec- ond electrical signal adapted to be automatically operated subsequent to the first signal for signalling when the cutter has cut down through the seam to the interface for stopping the cutting operation, thereby to avoid mining undesired material with the desired material. Similar signalling may be provided on an upward cut to avoid cutting into the overlying stratum.
332792
Campbell John A. L.
Moynihan Daniel J.
Peabody Coal Company
Smart & Biggar
LandOfFree
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