Mining or in situ disintegration of hard material – Processes – Stabilizing underground structure
Patent
1974-10-16
1976-04-20
Purser, Ernest R.
Mining or in situ disintegration of hard material
Processes
Stabilizing underground structure
37 87, 299 18, 299 30, E21C 4100
Patent
active
039514595
ABSTRACT:
Coal mining apparatus for removing subterranean material with minimal disruption of the overburden includes a mobile underground mining machine having rotary cutters mounted on the front of the machine for drilling coal in a coal deposit. The underground machine is track driven with an overhead protective shield to support the overburden above the machine as it digs into the coal deposit. The protective shield is slanted downward toward the rear of the mining machine to gradually lower the overburden as the mining machine passes under, thus replacing the excavated coal while minimizing disturbances on the surface. An elevator shaft is mounted on the underground mining machine and extends vertically upward to the earth's surface. A mobile track vehicle is attached to the elevator shaft at the surface and is coordinated to move in synchronization with the underground mining machine. A conveyor system transports coal from the rotary cutters through the vertical elevator shaft to the surface vehicle where it is loaded onto a transport vehicle. An endless chain digger is provided on the outside of the elevator shaft to cut a vertical passageway through the overburden to facilitate movement of the elevator shaft with the surface and underground machines.
REFERENCES:
patent: 1684869 (1928-09-01), Krueger
patent: 1856216 (1932-05-01), Jaeger
patent: 2711634 (1955-06-01), Joy
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