Yieldable roof support for mine passages and the like
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United States of America Patent
Stats
-
Apr 17, 1984
Grant Date -
N/A
app pub date -
Jun 17, 1981
filing date -
Jul 16, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A yieldable roof support structure for mine passages and the like includes inner and outer hollow segments attached end-to-end to form a closed or an opened support frame, the segments including separating walls defining chambers associated with the joined together ends so that, upon application of pressure to the chambers, the joined segments are moved apart to facilitate a disassembly of the frame. Alternatively, piston and cylinder units may span the joined ends of the segments for separating them upon the application of external pressure.
First Claim
Family
International Classification(s)
Cited Art Landscape
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