Blind fastener

Claim 1

IN A TWO PIECE HIGH STRENGTH BLIND FASTENER FOR SECURING TOGETHER A PLURALITY OF STRUCTURES HAVING ALIGNED CIRCULAR APERTURES THEREIN FORMING A PASSAGE THERETHROUGH AND ACCESSIBLE FROM ONLY ONE SIDE, AN INTERNAL OR BLIND MEMBER COMPRISING A THREADED SHANK HAVING A CIRCULAR HEAD AT ONE END WITH A BEARING SURFACE ON ITS SHANK SIDE INCLINED OUTWARDLY AWAY FROM SAID SHANK AT AN OBTUSE ANGLE TO THEAXIS THEREOF, SAID SHANK BEING OF SUCH LENGTH THAT SAID HEAD THEREON WILL BE LOCATED BEHIND THE NONACCESSIBLE SIDE OF SAID STRUCTURES WHEN SIAD FASTENER IS ASSEMBLED IN SAID STRUCTURES PREPARATORY TO DRIVING, A DRIVING CONNECTION AT THEEND OF SAID SHANK OPPOSITE SAID HEAD, A WEAKENED SECTION INTERMEDIATE SAID THREADED SHANK AND SAID DRIVING CONNECTION, AND AN EXTERNAL OR NONBLIND MEMBER THREADED ONTO SAID SHANK OF SAID BLIND MEMBER, SAID NONBLIND MEMBER COMPRISING A CYLINDRICAL TUBULARLIKE BODY PORTION HAVING AN OUTSIDE DIAMETER SUBSTANTIALLY EQUAL TO THE DIAMETER OF SADI HEAD OF SAID BLIND MEMBER AND AN INTEGRAL HEAD OF LARGER DIAMETER AT THE END OF SAID BODY PORTION REMOTE FROM SAID HEAD OF SAID BLIND MEMBER, SAID NONBLIND MEMBER ALSO COMPRISING A CIRCUMFERENTIAL CONTINUOUS CYLINDRICAL END PORTION AT THE END OF SAID BODY PORTION OPPOSITE ITS SAID HEAD ADAPTED TO BE FLARED OR EXPANDED OUTWARDLY TO FORM A BLIND HEAD AT THE NONACCESSIBLE SIDE OF SAID STRUCTURES, SAID CYLINDRICAL END PORTION HAVING AN OUTSIDE DIAMETER ABOUT 91% TO 99% THAT OF THE OUTSIDE DIAMETER OF SAID BODY PORTION, SAID HEAD OF SAID NONBLIND MEMBER HAVING A BEARING SURFACE ON ITS SIDE ADJACENT TO SAID BODY PORTION, SAID NONBLIND MEMBER BEING OF SUCH LENGTH THAT ITS SAID CYLINDRICAL END PORTION OPPOSITE ITS SAID HEAD PROJECTS BEYOND THE NONACCESSIBLE SIDE OF SAID STRUCTURES WHEN SAID FASTENER IS ASSEMBLED IN SAID STRUCTURES WITH SAID HEAD OF SAID NONBLIND MEMBER IN ENGAGEMENT WITH THE ACCESSIBLE SIDE OF SAID STRUCTURES, AND SAID BODY PORTION OF SAID NONBLIND MEMBER BEING OF SUCH LENGTH THAT ITS END OPPOSITE SAID HEAD OF SAID NONBLIND MEMBER DOES NOT PROJECT BEYOND THE NONACCESSIBLE SIDE OF SAID STRUCTURES WHEN SAID FASTENER IS ASSEMBLED IN SAID STRUCTURES WWITH SAID HEAD OF SAID NONBLIND MEMBER IN ENGAGEMENT WITH THE ACCESSIBLE SIDE OF SAID STRUCTURES.