Expansion stud anchor

Claim 1

AN EXPANSION STUD ANCHOR ADATPED TO BE SET INTO A PREDRILLED HOLE IN A BODY OF CONCRETE OR THE LIKE WHICH COMPRISES: AN ELONGATE SOLID STEEL INTEGRAL MEMBER OF SUBSTANTIALLY THE SAME OUTER DIAMETER THROUGHOUT ITS LENGTH AND HAVING A CENTRAL SHANK PORTION, A STUD END ADAPTED TO PROTRUDE FROM THE HOLE WHEN THE ANCHOR HAS BEEN SET, AND AN EXPANSION END OPPOSITE THE STUD END, THE EXPANSION END HAVING BROACHING RINGS, AND END UNDERCUTTING RING, A CENTRAL BLIND END AXIAL BORE EXTENDING PARTIALLY INTO SAID MEMBER AND AXIAL SLOTS DIVIDING SAME INTO CIRCUMFERENTIAL SEGMENTS TO PERMIT EXPANSION, A STEEL EXPANSION PLUG ADAPTED TO BE DRIVEN INTO THE BORE DURING SETTING OF THE ANCHOR AND COMPRISING A CONICAL TAPERED PORTION AT ONE END, AN INTEGRAL CYLINDRICAL PORTION OF DIAMETER THE SAME AS AND CONNECTED WITH THE LARGEST DIAMETER OF THE TAPERED PORTION, AND AN INTEGRAL FLANGE AT THE SECOND END OF THE PLUG, THE ANCHOR ADAPTED TO BE SET WITH THE PLUG DRIVEN INTO THE BORE OVER THE TAPERED PORTION WITH A SUBSTANTIAL AXIAL LENGTH OF THE LOWER CYLINDRICAL PORTION PROTRUDING, THE FLANGE HAVING A DIAMETER SUBSTANTIALLY THE SAME AS THAT OF THE SAID MEMBER AND THE SAID INTEGRAL CYLINDRICAL PORTION BEING SUBSTAINTIALLY LESS IN DIAMETER THAN THAT OF THE FLANGE WHEREBY WHEN THE ANCHOR IS SET THERE WILL BE AN ANNULAR CYLINDRICAL SPACE BETWEEN THE CYLINDRICAL SECTION AND THE HOLE TO ACCOMMODATE THE CUTTINGS FROM THE UNDERCUTTING ACTION OF THE UNDERCUTTING RING WITH SUBSTANTIALLY NO ADVERSE COMPRESSION EFFECTS THEREOF BETWEEN THE EXPANSION END AND THE FLANGE, THE TAPERED PORTION BEING OF A LENGTH AND CONICAL TAPER DIMENSIONS RELATIVE TO THE DIAMETER OF THE BORE SUCH THAT WHEN DRIVEN INTO THE BORE OVER SAID TAPERED PORTION, SAID PLUG, WILL LOCK INTO THE BORE WHILE THE EXPANSION END WILL HAVE EXPANDED AND UNDERCUT THE HOLE SUFFICIENTLY TO SECURE THE ANCHOR WITHIN SAID HOLE.