| 摘要 |
A flush rivet is configured for joining first and second overlapping structural members together, wherein the structural members define a bore comprising a cylindrical main bore, a cylindrical counterbore and a frustoconical intermediate bore between the counterbore and the main bore. The rivet includes a cylindrical shank dimensioned to be received the main bore, and having a distal end formed as a tail portion that projects distally from the main bore. The proximal end of the shank terminates in a head that includes a cylindrical section having a diameter that is slightly less than the diameter of the cylindrical counterbore, and a frustoconical section, between the shank and the cylindrical section, configured to seat in the intermediate bore. An end face on the proximal end of the head includes a central region having a first radius of curvature that is between 9 and 25 times the shank diameter, and a peripheral region having a second radius of curvature that is less than the first radius of curvature. Upon being installed in the bore, the rivet deforms in the following sequence: (1) the radial expansion of the shank so as to fill the main bore; (2) the substantially simultaneous (a) upsetting of the tail against the second structural member, and (b) deformation of the frustoconical head section to seat tightly against the surface of the intermediate bore; and (3) the radial expansion of the cylindrical head section to provide an interference fit between the cylindrical head section and the interior surface of the cylindrical counterbore.
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