Patent ID: 8366363

Claim:
A rivet assembly comprising: at least one workpiece having a first outer surface and an opposite second outer surface, a first countersink located in the first outer surface and a second countersink located in the second outer surface, and the countersinks being connected by a through-hole; a blind rivet comprising a body and a tool-side flange, the body including a smooth 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, the stem of the mandrel being smooth between the rivet and a mandrel tip prior to setting, and an outwardly tapering shoulder located on the mandrel between the head and the stem prior to rivet setting; the head being completely pulled through the rivet during rivet setting without severing the mandrel; the mandrel head including a depression located below a nominal tail end prior to rivet setting, the depression allowing lateral compression of the head during the pulling through of the head during setting; and the flange of the rivet being located substantially flush or below flush of the first outer surface and in the first countersink after rivet setting, a blind end of the rivet being expanded by the mandrel substantially flush or below flush of the second outer surface and into the second countersink after rivet setting, and a cylindrical center section of the rivet spacing apart the flange and the expanded blind end sections of the rivet after rivet setting; wherein the pulling through of the head and shoulder during setting causes the blind end of the rivet body to outwardly expand into the adjacent countersink and radially expand the rivet body to completely fill the through-hole.