Blind rivet

Claim 1

A BLIND RIVET ADAPTED TO BE INSERTED FROM THE TOP SIDE AND SET IN THE ALIGNED APERTURES IN A PLURALITY OF WORK PIECES, COMPRISING: A TUBULAR SLEEVE INCLUDING A SHANK WITH A RADIALLY ENLARGED HEAD AT ONE END AND AN AXIAL PASSAGEWAY EXTENDING THERETHROUGH FROM END TO END, SAID SLEEVE BEING ADAPTED TO BE INSERTED INTO THE ALINGED APERTURES IN THE WORK PIECES WITH SAID HEAD ABUTTING THE TOP SIDE OF THE SAME AND WITH THE SHANK PROJECTING FROM THE OPPOSITE BLIND SIDE OF THE WORK PIECES; A PIN INCLUDING, IN SERIES, A PULLING SECTION INITIALLY DISPOSED IN SAID PASSAGEWAY WITH A GRIPPING END PROJECTING FROM THE HEADED END OF SAID SLEEVE, AND EXPANDING SECTION OF A CROSS-SECTION GREATER THAN THAT OF SAID PASSAGEWAY AND INITIALLY PROJECTING FROM THE SHANK END OF THE SLEEVE, AND A BLIND HEAD OUTWARD OF, AND LARGER IN DIAMETER THAN SAID EXPANDING SECTION SO AS TO PROVIDE AN ANNULAR TAPERED SECND SHOULDER AT THE JUNCTURE OF THE BLIND HEAD AND EXPANDING SECTION, SAID EXPANDING SECTION BEING ADAPTED UPON AN AXIAL PULLING FORCE BEING APPLIED TO SAID PULLING SECTION AND A REACTIVE FORCE OPPOSITE TO SAID RADIALLY ENLARGED HEAD TO BE DRAWN INTO SAID PASSAGEWAY TO EXPAND THE PROJECTING PORTION OF SAID SHANK AND, THEREAFTER, THE PORTION THEREOF DISPOSED WITHIN THE ALIGNED APERTURES IN SAID WORK PIECES, SAID BLIND HEAD BEING ADAPTED UPON THE CONTINUED APPLICATION OF SUCH THAT OF AT LEAST SAID EXPANDING SECTION AND SAID SECSHANK TO FURTHER EXPAND THE SAME; FIRST SHOULDER MEANS ON THE EXTERIOR OF SAID PIN AXIALLY SPACED FROM SAID SECOND SHOULDER TOWARD SAID PULLING SECTION, WHICH IS OF A UNIT HARDNESS GREATER THAN THAT OF AT LEAST SAID EXPANDING SECTION AND SAID SECOND SHOULDER, AND STOP SHOULDER ON THE INTERIOR OF SAID SLEEVE ADJACENT SAID RADIALLY ENLARGED HEAD ENGAGEABLE TO STOP PIN MOVEMENT, SAID EXPANDING SECTION BEING ADAPTED TO BE PULLED INTO THE BLIND END OF SAID SHANK TO EXPAND THE SAME AND TO WIREDRAW DOWN IN DIAMETER AND, THEREAFTER, SAID BLIND HEAD BEING ADAPTED TO BE PULLED INTO SAID SHANK TO FURTHER EXPAND THE SAME WITH SAID SECOND SHOULDER BEING DRAWN UP ADJACENT THE BLIND SIDE OF THE WORK PIECES AND DEFORMED TO EXPAND THE AXIALLY ALIGNED PORTION OF THE SHANK INTO ENGAGEMENT WITH THE BLIND SIDE OF THE WORK PIECES, THE EXTENT TO WHICH SAID EXPANDING SECTION AND BLIND HEAD ARE PULLED INTO SAID SHANK AND SAID SECOND SHOULDER IS DEFORMED BEING LIMITED BY THE LEADING EDGE OF SAID FIRST SHOULDER ABUTTING SAID STOP SHOULDER IN SAID SLEEVE; AND MEANS ADJACENT SAID RADIALLY ENGLARGED HEAD FOR LOCKING SAID PIN AGAINST MOVEMENT RELATIVE TO SAID SLEEVE, AND MEANS LOCATED ON SAID PIN ADJACENT SAID FIRST SHOULDER AND BETWEEN SAID FIRST SHOULDER AND SAID PULLING SECTION FOR RECEIVING SAID LOCKING MEANS.