US Patent Issued to Sandvik Mining and Construction Australia (Production/Supply) on Nov. 11 for "Double-wedge rock bolt" (Australian Inventors)

ALEXANDRIA, Va., Nov. 11 -- United States Patent no. 12,467,361, issued on Nov. 11, was assigned to Sandvik Mining and Construction Australia (Production/Supply) Pty Ltd (Milton, Australia).

"Double-wedge rock bolt" was invented by Mietek Rataj (New South Wales, Australia), Bradley Darlington (New South Wales, Australia) and Warren Roach (New South Wales, Australia).

According to the abstract* released by the U.S. Patent & Trademark Office: "A rock bolt includes a wedge-based expansion mechanism. The expansion mechanism includes a drive wedge arranged to expand an intermediate wedge upon tensioning of the rock bolt, wherein the intermediate wedge is arranged to expand a wedge device attached to an outer tube of the rock bolt. The use of t...