Mine roof support
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United States of America Patent
Stats
-
Feb 21, 1984
Grant Date -
N/A
app pub date -
Apr 20, 1982
filing date -
Apr 25, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of mining a mineral in which a roof is supported by a plurality of mine roof supports of the kind specified, each advanceable by a force applied to a lower part thereof. During advance of the support an upper part thereof can be sufficiently retarded, by hydraulic jacks carried, by each of its adjacent supports, with respect to the advance of its lower part. This causes the support effectively to rotate and to raise the leading end of the lower part away from the ground on which it is advancing.
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Family
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Cited Art Landscape
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