Collapsible crib mining support column
AssigneeMountainland Support, Inc.
InventorChris D. Kitchen
Life of this patent
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Abstract
A roof support column used as a support between the roof and floor of a mine comprises a stacked series of hollow roof support cribs containing a mixture of light-weight aggregate such as volcanic lava, tuft, or pumice, and a chemical foam contained in a double-walled high density paper tubing. The combination of these materials results in a roof support crib which has the yielding characteristics of wood. Such cribs called variable yielding cribs are stacked and locked on top of one another to form a vertical cylindrical cribbing support column.
Claims6
A collapsible crib for a mine roof support column, comprising in combination:
- a double-walled vertical support structure having a hollow center and an upper surface and a lower surface, said double wall having an outer wall and an inner wall in spaced-apart relationship with each other;
- an adjustable locking device for interlocking a plurality of cribs in vertical relationship one with another compromising a slideably mounted inner sleeve disposed along the inner surface of the inner wall of the double-walled vertical support structure, and adapted to move upwardly to interlock with a cooperating receptacle in the lower surface of the double-walled vertical support structure;
- and
- a composite material filling the aperture between the inner and outer walls of said double wall, said composite material comprising a combination of a urethane formable material and a rock aggregate.
Dependencies are inferred from the claim text.