Patent ID: 7322783
Filing Date: 2008-01-29
Classification: B21J,F16B,Y10T

Abstract:
1. A rivet body; which comprises: a cylindrical portion having a first end and a second end; a flange formed integrally with the cylindrical portion at the first end thereof; and the cylindrical portion and the flange being formed with an axial passage which extends therethrough; wherein the axial passage comprises: a first end; a second end; a plurality of generally flat internal bearing surfaces, the generally flat internal bearing surfaces being parallel to an axis defining the axial passage, the bearing surfaces further having a trailing end at a second end of the axial passage; a cylindrical section formed in the axial passage intermediate the trailing end of the internal bearing surfaces and the first end of the axial passage; a first tapered section formed in the axial passage between, and tapering inward from, the trailing end of the generally flat bearing surfaces and an adjacent end of the cylindrical section; and a second tapered section formed in the axial passage between, and tapering inward from, the first end of the axial passage and an adjacent end of the cylindrical section.