Patent ID: 7033120

Claim:
A blind type fastener for securing a plurality of workpieces, comprising: (a) a one piece sleeve having a body that is internally threaded along a portion of the sleeve body integrally connected to the sleeve, a head positioned at one end of the sleeve integrally connected to the sleeve and a deformable tail portion positioned at an opposite end of the sleeve integrally connected to the sleeve, the threaded portion of the sleeve transitioning to the deformable tail portion of the sleeve with a step, the head of the sleeve having a plurality of recesses disposed in the head of the sleeve in the general shape of a circle and the deformable tail portion having an internal surface that is smooth; (b) a pin member having an elongated shank, the shank having a straight smooth portion received within the deformable tail portion and a threaded portion threadedly engaging the sleeve, the pin member having a head positioned at one end of the pin member, the threaded portion of the pin member having a breakneck groove that separates the pin member into a portion that remains with the fastener after being set and a removable pin tail portion that is removed from the fastener after being set, the breakneck groove fracturing at a position that is flush in substantially all grip ranges of the fastener with an outer surface of the head of the sleeve after being set; (c) a drive nut having a bore that is positioned on the removable pin tail portion of the pin member and has a plurality of projections positioned on one end of the drive nut in the general shape of a circle that are disposed in the plurality of recesses disposed in the head of the sleeve; and (d) a plurality of dimples disposed on the body of the sleeve to physically engage a portion of the sleeve with the pin member, wherein torque applied to the pin member with an installation tool turns the pin member until the deformable tail has formed a bulb and the straight smooth portion has engaged the step of the sleeve thereby stopping further movement of the pin member, the breakneck groove of the pin member moving to a position that is flush in substantially all grip ranges of the fastener with the outer surface of the head of the sleeve and continued torque applied to the pin member while holding the drive nut against rotation twists off the removable pin tail portion of the pin member at the breakneck groove with the drive nut still positioned on the removable pin tail portion of the pin member such that the pin member does not need to be shaved in substantially all grip ranges of the blind fastener after being set.