Blind fastener with locking collar

Claim 1

A BLIND FASTENER FOR CONNECTING A PLURALITY OF WORKPIECES HAVING ALIGNED OPENINGS THERETHROUGH, SAID FASTENER COMPRISING: AN EXPANDING SLEEVE, A FILLER SLEEVE AND A PIN MEMBER HAVING AN ENLARGED PIN HEAD AT ONE END, SAID FILLER SLEEVE HAVING AN ENLARGED HEAD AT ONE END AND HAVING A THROUGH BORE AND BEING LOCATABLE UPON SAID PIN MEMBER, SAID EXPANDING SLEEVE HAVING A THROUGH BORE AND BEING LOCATABLE ON SAID PIN MEMBER BETWEEN SAID FILLER SLEEVE AND SAID PIN HEAD WITH SAID EXPANDING SLEEVE BEING AXIALLY SPACED FROM SAID FILLER SLEEVE, SAID FILLER SLEEVE BEING LOCATABLE WITHIN THE ALIGNED BORES WITH SAID ENLARGED HEAD ENGAGING A FORWARD SURFACE OF THE WORKPIECES AND WITH THE OPPOSITE END OF SAID FILLER SLEEVE EXTENDING BEYOND A REARWARD SURFACE OF THE WORKPIECES, MEANS AT THE OPPOSITE END OF SAID PIN MEMBER ADAPTED TO BE GRIPPED BY A TOOL FOR SETTING THE FASTENER WHEREBY A RELATIVE AXIAL FORCE CAN BE APPLIED BETWEEN SAID PIN MEMBER AND SAID FILLER SLEEVE THROUGH SAID EXPANDING SLEEVE WITH SAID ONE END OF SAID EXPANDING SLEEVE BEING MOVED TELESCOPICALLY OVER SAID OPPOSITE END OF SAID FILLER SLEEVE AND INTO ENGAGEMENT WITH THE REARWARD SURFACE OF THE WORKPIECES WHEREBY THE WORKPIECES ARE PULLED TOGETHER, SAID EXPANDING SLEEVE HAVING A WALL GRADUALLY DECREASING IN THICKNESS IN A DIRECTION FROM SAID PIN HEAD TOWARD SAID FILLER SLEEVE WITH THE DECREASING WALL THICKNESS BEING OF A PRESELECTED GRADIENT WHEREBY SAID EXPANDING SLEEVE BUCKLES RADIALLY OUTWARDLY PROXIMATE THE REARWARD SURFACE UPON AN INCREASING IN THE RELATIVE AXIAL FORCE, AND MEANS FOR LOCKING SAID PIN MEMBER TO SAID FILLER, SLEEVE MEMBER AFTER SAID EXPANDING SLEEVE HAS BUCKLED, SAID EXPANDING SLEEVE DECREASING IN THICKNESS OVER APPROXIMATELY MOST OF ITS LENGTH WITH THIS DECREASE IN THICKNESS BEING LOCATED AT THE OUTER SURFACE OF SAID EXPANDING SLEEVE WHEREBY SAID OUTER SURFACE IS TAPERED.