Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1981-06-18
1983-10-25
Corbin, David H.
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
405299, E21D 2300
Patent
active
044115598
ABSTRACT:
Coal in the roof of a seam being mined by the long wall method is recovered by supporting an elongated area of the seam roof using a plurality of cradle supports, the front cradles being moved forward stepwise parallel to the long wall to form a passage with cantilevered roof supporting arms of the rear cradles. When the rear cradle at one end of the passage is moved forward into engagement with the front cradles, the coal in the roof is left unsupported, is collapsed, and is removed via a conveyor and a loader in the passage.
REFERENCES:
patent: 3383868 (1968-05-01), Wilkenloh et al.
patent: 4073151 (1978-02-01), Harmsma
Corbin David H.
Dutton, Jr. Harold H.
Pistel Nancy J.
LandOfFree
Mining system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Mining system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mining system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-709962