Fastener and method of making the same

Claim 1

A THIN SHEET-METAL CAP-LIKE FASTENER FOR MOUNTING ON THE END OF A SHAFT AND THE LIKE COMPRISING AN END WALL ON ONE END OF SAID FASTENER, AN AXIALLY DIVERGING, CYLINDRICAL-LIKE SIDE WALL DEFINING A SHAFT RECEIVING OPENINGS IN THE OTHER END OF SAID FASTENER, THE FREE END OF SAID SIDE WALL CURVING OUTWARDLY AND DEFINING A GENERALLY ANNULAR BRIM-LIKE PORTION ON THE OTHER END OF SAID FASTENER, A PLURALITY OF PAIRS OF AXIALLY SPACED, GENERALLY ALIGNED PROJECTING SHARPENED BEADS DISPOSED IN CIRCUMFERENTIALLY SPACED RELATION ABOUT THE INTERIOR SURFACE OF THE SIDE WALL OF SAID FASTENER, SAID SHARPENED BEADS BEING INTEGRALLY FORMED FROM THE METAL OF SAID SIDE WALL AND BEING OF AN INCREASED HARDNESS RELATIVE TO THE METAL OF SAID SIDE WALL, SAID BEADS BEING GENERALLY CIRCUMFERENTIALLY ARCUATE AND BEING AXIALLY SPACED FROM SAID END WALL AND FROM THE FREE END OF SAID SIDE WALL, THE SHARPENED BEADS OF EACH PAIR WHICH ARE DISPOSED CLOSEST TO SAID END WALL EXTENDING INTERIORLY OF SAID FASTENER A GREATER DISTANCE THAN DOES THE OTHER OF SAID SHARPENED BEADS TO SHAVE THE MATERIAL OF THE SHAFT TO FORM OUTWARDLY PROJECTING RETAINING LUGS ON THE EXTERIOR SURFACE OF THE SHAFT UPON AXIAL MOVEMENT OF THE FASTENER ONTO THE END OF THE SHAFT, AND THE SAID OTHER OF THE SHARPENED BEADS DISPOSED MOST REMOTE FROM SAID END WALL OF SAID FASTENER ACTING AS AN ABUTMENT FOR ENGAGEABLY COACTING WITH THE FORMED LUGS ON THE SHAFT, TO PREVENT WITHDRAWAL OF THE FASTENER FROM THE SHAFT.