Underground support devices
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United States of America Patent
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-
Dec 25, 1984
Grant Date -
N/A
app pub date -
Sep 24, 1982
filing date -
Nov 14, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An underground support, e.g. for the roof of a mine, has a roof engaging canopy 10 which can be raised and lowered in a controlled manner by hydraulic legs 14. Inflatable flexible membrane means, for example in the form of bags 12, are provided on the upper face of the canopy 10, which shape themselves to the mine roof and distribute loading evenly thereto. Inflatable flexible membrane means may also be used to prevent flushing of loose debris between adjacent supports, and on roadway supports.
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