Rivet pin and sleeve structure

Claim 1

A RIVET ASSEMBLY COMPRISING A PIN HAVING A GRIPPABLE MEANS AT ONE END CONNECTED BY A SHANK TO AN ENLARGED HEAD HAVING A ROUNDED PERIPHERAL EDGE AT THE OTHER END WITH A PERIPHERAL ROUND-BOTTOMED GROOVE IMMEDIATELY ADJACENT SAID ROUNDED PERIPHERAL EDGE OF SAID HEAD AND AN ANNULAR RIB ON SAID SHANK ADJOINING THE EDGE OF SAID PERIPHERAL GROOVE AWAY FROM THE HEAD, ONE SIDE OF THE RIB FORMING A CONTINUATION OF ONE SIDE OF THE GROOVE SO AS TO INCREASE THE EFFECTIVE DEPTH OF THE GROOVE, A TUBULAR RIVET OPEN AT BOTH OF ITS ENDS AND INCLUDING A SLEEVE HAVING A HEAD AT ONE END AND A TAIL AT THE OTHER END, SAID SLEEVE HEAD HAVING A SHOULDER WHICH FACES SAID TAIL WITH THE WALL OF THE SLEEVE AT THE TAIL HAVING AN INSIDE CYLINDRICAL SURFACE OF A DIAMETER SLIGHTLY LESS THAN THE MAXIMUM OUTSIDE DIMENSION OF THE ENLARGED PIN HEAD AND AN OUTSIDE DIAMETER SLIGHTLY GREATER THAN SAID MAXIMUM OUTSIDE DIMENSION OF THE PIN HEAD, SAID ANNULAR RIB HAVING A SHARP CREST OF A DIAMETER LARGER THAN THE DIAMETER OF THE SHANK PROPER AND LESS THAN THE MAXIMUM OUTSIDE DIMENSION OF THE ENLARGED PIN HEAD AND SAID PERIPHERAL GROOVE BEFORE SETTING OF THE RIVET ASSEMBLY CONTAINING NO PORTION OF THE TUBULAR RIVET AND UPON SETTING BEING SUBSTANTIALLY FILLED WITH AN EXTRUDED PORTION OF SAID RIVET.