Mine prop
AssigneeBurrell Mining Products, Inc.
InventorsWilliam L. Harbaugh, Charles C. Lash
Life of this patent
Estimating the term…
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.
Claims36
A longitudinally yieldable support prop, comprising:
- an elongate tube;
- a plurality of elongate support members, each having a length that is less than a length of said elongate tube, attached to said elongate tube along a length thereof to substantially prevent kneeling or buckling of said elongate tube along the portion of said elongate tube to which said plurality of elongate support members are attached, said plurality of elongate support members defining a laterally supported region and at least one yieldable region proximate at least one end of said elongate tube;
- and
- a compressible filler material disposed within at least one portion of said elongate tube to allow supported yielding in said at least one yieldable region.
A longitudinally yieldable support prop, comprising:
- an elongate tube having a first end and a second end;
- a lightweight concrete disposed within said elongate tube and substantially filling said elongate tube between said first end and said second end of said elongate tube;
- and
- a plurality of elongate support members each having a first end and a second end and each longitudinally extending along and attached to said elongate tube, said first end of each of said plurality of elongate support members being spaced from said first end of said elongate tube and said second end of each of said plurality of elongate support members being spaced from said second end of said elongate tube to form a yieldable portion of said elongate tube at each of said first end second ends thereof.
Dependencies are inferred from the claim text.