Patent ID: 8348566

Claim:
A blind fastener with an initial configuration and a deformed configuration when installed, the initial configuration comprising: a body comprising a tapered ramp portion and said body defining a body bore; a sleeve comprising a sleeve bore, a leading edge portion, a base portion and a bulbing portion therebetween, wherein an inner diameter of said bulbing portion gradually increases as said bulbing portion extends away from said leading edge portion to a narrowed portion and then gradually decreases as said bulbing portion extends from said narrowed portion toward said base portion, and wherein said leading edge portion abuts said tapered ramp; a core bolt passing through said body bore and said sleeve bore; a deformable insert positioned between said core bolt and said narrowed portion; and a means for advancing said sleeve over said body; wherein said sleeve buckles radially outwardly at said narrowed portion and doubles on itself when said leading edge portion is obstructed from advancing along said body and said means continues to advance said sleeve over said body.