Coiled pin with flap stop

摘要

An improved coiled pin comprises a rectangular strip of metal coiled to form a substantially cylindrical pin having leading and trailing ends with a longitudinal edge on the pin exterior extending between the leading and trailing ends. The longitudinal edge has a transverse slit closer to the leading end than to the trailing end, thereby forming a flap having a width extending between the slit and the leading edge and having a free end aligned with the longitudinal edge. When the pin is fully installed and the flap is immediately adjacent the exit of the hole, the compression of the pin at the hole exit tends to expand the flap beyond such natural relaxation, approaching its neutral diameter, thereby providing a more pronounced mechanical stop against withdrawal.