Bolt anchoring means

Claim 1

A BOLT ANCHORING DEVICE COMPRISING A CYLINDRICAL BUSHING HAVING A LOCKING THREAD ON THE OUTER SURFACE ADAPTED TO BE THREADED INTO A THREADED SOCKET IN A BODY OF SOFTER MATERIAL THAN THE BUSHING, THE LOCKING THREAD ON THE BUSHING BEING GENERALLY TRIANGULAR IN CROSS-SECTION WITH A TRUNCATED CREST AND A BROAD INCLINED SURFACE AT THE ROOT DISPOSED AT A SLIGHT ANGLE TO THE AXIS OF THE BUSHING WITH THE FLANKS OF THE THREADS ON THE BODY AND BUSHING ENGAGING WITH AN INTERFERENCE FIT AND CAPABLE OF CAUSING THE MATERIAL OF THE THREADS ON THE BODY TO BE DEFORMED AND TO FLOW TO FILL UP ANY VOIDS INCLUDING THE VOID BETWEEN THE CREST ON THE THREADS IN THE SOCKET AND THE INCLINED ROOT SURFACES THEREOF AND SECURELY LOCK THE BUSHING IN THE SOCKET AS AN INCIDENT TO THE THREADING OF THE BUSHING INTO THE SOCKET, SAID BUSHING HAVING A BOLT-RECEIVING THREADED BORE THERETHROUGH, THE IMPROVEMENT WHEREIN THE BUSHING IS PROVIDED WITH A RADIALLY DISPOSED APERTURE FORMED IN SAID BUSHING COMPLETELY THROUGH THE WALL THICKNESS THEREOF AND BETWEEN THE CRESTS OF A PAIR OF THREAD CONVOLUTIONS, THE WALLS FORMING SAID APERTURE INTERSECTING THE OPPOSED FLANKS OF SAID PAIR OF THREADS, THE AXIAL DISTANCE BETWEEN SAID WALLS BEING GREATER THAN THE SURFACE OF THE ROOT, BUT LESS THAN THE DISTANCE BETWEEN THE OPPOSED FLANKS MEASURED AT THE CRESTS OF SAID THREAD WHEREBY A SPACE IS FORMED BETWEEN THE CRESTS OF THE MATING THREAD ON SAID BODY AND SAID RADIALLY EXTENDING WALLS, AND A DEFORMABLE SYNTHETIC RESINOUS PLUG DISPOSED IN THE HOLE HAVING A VOLUME FILLING THE HOLE AND PROJECTING BEYOND THE THREADS ON THE OUTSIDE AND INSIDE OF THE BUSHING, THE END OF THE PLUG PROJECTING ON THE OUTSIDE OF THE BUSHING BEING DEFORMED BY THE THREADS ON THE BODY AS THE BUSHING IS THREADED INTO THE BODY AND FLOWING INTO SAID SPACE BETWEEN SAID MATING THREADS AND THE WALLS OF SAID APERTURE TO THEREBY INTERLOCK WITH THE THREADS ON THE BUSHING AND ON THE BODY TO RESIST TURNING OF THE BUSHING IN THE SOCKET AND ALSO TO HOLD THE PLUG IN POSITION ON THE BUSHING AND THE OTHER END OF THE PLUG BEING SHAPED BY THE THREADS ON THE BOLT TO RESIST TURNING THEREOF.