Patent ID: 7824141

Claim:
A rivet assembly comprising: at least one workpiece having a first outer surface and an opposite second outer surface, a countersink located in each outer surface connected by a hole; a blind rivet comprising a body and a tool-side flange, the body including a cylindrical outside surface from the flange to a blind end prior to rivet setting, and a surface of the flange tapering outwardly from the outside surface of the body; and a mandrel comprising an elongated stem and a head, the stem extending through the rivet prior to setting, the head being laterally larger than the stem prior to rivet setting, and an outwardly tapering shoulder located on the head adjacent the stem, the shoulder further comprising first and second different surfaces; the head being completely pulled through the rivet during rivet setting without severing the head from the stem of the mandrel, and the mandrel being discarded after setting the blind rivet; the pulling through of the head during setting causing the blind end of the rivet body to outwardly expand into the adjacent countersink; the flange of the rivet being located in the adjacent countersink after rivet setting; and at least one rib projecting from the shoulder of the mandrel.