Fastening device

Claim 1

A MASONRY FASTENING DEVICE ADAPTED FOR INSERTION INTO A PRE-DRILLED HOLE IN MASONRY COMPRISING A TUBULAR SHELL AND A TAPERED EXPANDER PIN; THE TUBULAR SHELL HAVING AN AXIAL BORE OF SUBSTANTIALLY UNIFORM DIAMETER EXTENDING THE ENTIRE LENGTH OF THE SHELL AND A SLITTED END PORTION LOCATED ADJACENT THE FIRST INSERTED END OF THE SHELL, SAID PORTION HAVING A PLURALITY OF SLITS AT CIRCUMFERENTIAL INTERVALS RUNNING LONGITUDINALLY FORWARD FROM THE FIRST INSERTED END OF THE SHELL, THE OUTER CIRCUMFERENTIAL SURFACE OF THE SLITTED PORTION BEING KNURLED AND HAVING AN ANNULAR GROOVE POSITIONED IN PROXIMITY TO THE SLITTED END, A SERIES OF INTERNAL THREADS LOCATED WITHIN THE BORE OF THE SHELL, SAID THREADS RECESSED FROM THE LAST INSERTED END OF THE SHELL AND EXTENDING INWARDLY NOT MORE THAN ONE-HALF THE ENTIRE LENGTH OF THE SHELL; THE TAPERED EXPANDER PLUG ADAPTED TO BE INSERTED SMALL END FIRST INTO THE BORE OF THE TUBULAR SHELL AT THE SLITTED END, SAID PLUG HAVING A TAPERED PORTION WITH A MAJOR DIAMETER LARGER THAN THE DIAMETER OF THE SHELL BORE AND A RECESSED PORTION WITH A DIAMETER LESS THAN THE MAJOR DIAMETER OF THE TAPERED PORTION, SAID RECESSED PORTION HAVING A LONGITUDINAL LENGTH OF APPROXIMATELY ONE-THIRD THE LENGTH OF THE PLUG, SAID RECESSED PORTION BEING LOCATED ADJACENT TO THE LARGER END OF SAID TAPERED PORTION AND AN ENLARGED FLANGE LOCATED AT THE END OF THE TAPERED PLUG OPPOSITE TO THE FIRST INSERTED END WHEREBY UPON FULL INSERTION OF THE PLUG INTO THE SHELL THE EXPANDED END PORTION OF THE SHELL FLOWS AROUND THE POINT OF MAJOR DIAMETER OF THE TAPERED PORTION OF THE PLUG AND INTO THE RECESSED PORTION THEREBY LOCKING THE SHELL AND PLUG TOGETHER.