Importance

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Abstract

A flush break blind fastener is provided having as principle components a stem member, a drive-nut, and a deformable annular means. The stem member has an externally-threaded-portion on the accessible-side thereof, and may have a stem-head on the nonaccessible side thereof. The drive-nut is screwed onto the externally-threaded-portion of the stem member. The deformable annular means has as principle parts a head which is larger in diameter than the diameter of the boreholes of the workpieces, and an intermediate-part adjacent the head, and a deformable tail-part adjacent the intermediate-part and abutting the stem-head for securing the workpieces when the fastener is set. The outer-portion of the stem member contains a turning means for rotating the stem member relative to the drive-nut. Either the stem member or the drive-nut are held fast while rotating the other until the fastener is set and upon further rotation of the stem member relative to the drive-nut will cause the stem member to break at the intersection between the drive-nut and head. Prior to such rotation, the break is facilitated by providing various means in the threaded portion of the stem member. In one embodiment, the threaded portion may be provided with differing sized threads, the narrower diameter thread being at the top to facilitate break at the intersection of the threads.

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First Claim