Mine prop
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United States of America Patent
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Jun 28, 2005
Grant Date -
Dec 2, 2004
app pub date -
May 26, 2004
filing date -
May 27, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A mine prop is comprised of an elongate tube having a slenderness ratio that would generally allow buckling or kneeling of the elongate tube when exposed to a sufficient axial force. A plurality of elongate support members having a length less than the elongate tube are attached to the tube to prevent buckling or kneeling of the elongate tube along the portion of the tube to which the elongate support members are attached. The portions of the tube that are unsupported by the elongate support members define one or more yieldable zones proximate at least one end of the tube. A compressible filler material is disposed within at least portion of the tube to support yielding in the yieldable zone.
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