Yieldable support prop and method
AssigneeStrata Products Worldwide, LLC
InventorsClifford A. McCartney, Thomas P. O'Donnell
Life of this patent
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Abstract
A yield support prop for a mine includes a first metal tube extending from the mine floor having a first portion having a first outside diameter and a second portion having a second outside diameter. The prop includes a second metal tube that is disposed about the first portion and extends toward the mine roof, when the second tube receives a load from the mine roof, the second portion deforms the second tube and expands the second tube creating resistance against the load from the mine roof. A method for supporting a mine roof. A method for building a yieldable mine prop.
Claims18
A yield support prop for a mine comprising:
- a first metal tube extending from the mine floor having a first portion having a smooth first outside diameter and a second portion having a second outside diameter, the second portion includes at least one metal bead welded to the first portion or a metal ring welded to the first portion, the height of the second portion extends from the first portion at least 0.15 inches more than the inside diameter of the second tube, the yield strength of the first tube is greater than the yield strength of the second tube;
- and
- a second metal tube having a smooth inner diameter that is disposed about the first portion and extends toward the mine roof, when the second tube receives a load from the mine roof, the second tube slides down over the first tube and the second portion deforms the second tube and expands the second tube creating resistance against the load from the mine roof.
A method for supporting a mine roof comprising the steps of:
- placing a yieldable mine prop in the mine so a first metal tube of the prop extends from the mine floor and a second metal tube of the prop extends from the first tube toward the mine roof;
- receiving a load from the mine roof by the second tube;
- and
- sliding the second tube under the load against resistance from a second portion of the first tube that extends from a first portion of the first tube having a smooth outer diameter that deforms the second tube, the second portion includes at least one metal bead welded to the first portion or a metal ring welded to the first portion, the height of the second portion extends from the first portion at least 0.15 inches more than the inside diameter of the second tube, the yield strength of the first tube is greater than the yield strength of the second tube, the second metal tube having a smooth inner diameter that is disposed about the first portion.
A method for building a yieldable mine prop comprising the steps of:
- welding a second portion to a first portion having a smooth first outside diameter, the second portion includes at least one metal bead welded to the first portion or a metal ring welded to the first portion, the height of the second portion extends from the first portion at least 0.15 inches more than the inside diameter of the second tube;
- fitting a bottom end of a second metal tube having a smooth inner diameter over a top end of a first metal tube;
- and
- moving the bottom end of the second tube against the second portion of the first tube which extends from a first portion of the first tube, the yield strength of the first tube is greater than the yield strength of the second tube.
Dependencies are inferred from the claim text.