Cribbing
AssigneeCommercial Shearing, Inc.
InventorNicholas Chlumecky
Life of this patent
Estimating the term…
Abstract
A crib member for forming underground cribbing is provided in the form of a concrete annulus formed within at least one annular metal retaining member so as to form a donut shaped member. A plurality of such members is stacked one on top of another to form a cylindrical cribbing with a central hole.
Claims8
A yieldable, deformable crib member for use in superimposed layers one upon another as cylindrical hollow cribbing in an underground cavity comprising a portable concrete annulus of greater diameter than height having an unsupported center opening and at least one annular metal retaining member surrounding the outside periphery of said member and firmly attached thereto.
Dependencies are inferred from the claim text.