Blind fastener with two-piece expander

Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – Frangible member

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Details

411 70, 470 30, F16B 1304, F16B 1306, B21K 144

Patent

active

054294649

ABSTRACT:
A blind fastener which comprises a fastener body, a stem and a two-piece shear/expander assembly. The assembly includes an anchor section sized to fit within an annular groove in a neck portion of the stem and an expander collar which surrounds the shear ring. When the fastener is installed, a bulbing portion of the expander collar upsets the tail end of the fastener until an inner shoulder of the collar step causes an outer section of the ring to shear from the anchor section. A lock ring groove is formed in the stem midsection of smaller diameter at the intersections of the stem neck and midsection. The shear ring may be formed of shaped wire which is wrapped around the fastener stem, while the expander collar is an annular element next to the shear ring. The shear ring dimensions and material properties can be modified to alter the fastener characteristics.

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