| 摘要 |
In combination with a workpiece having a bore, a first counterbore, and a second counterbore which is frusto-conical and tapers forwardly between the first counterbore and the bore and toward the bore, A. A RIVET HAVING AN AXIALLY EXTENDING SHANK RECEIVED IN THE WORKBORE AND DEFINING AN AXIS, B. THE RIVET INCLUDING A HEAD HAVING AN END FACE, A FIRST SECTION LOCATED FORWARDLY OF SAID END FACE, AND A SECOND AND FORWARDLY TAPERED FRUSTO-CONICAL SECTION LOCATED FORWARDLY OF THE FIRST SECTION, C. THE FIRST SECTION HAVING AN INITIAL UNDEFORMED OUTER SURFACE OF A DIAMETER WHICH IS LESS THAN BUT ABOUT THE SAME AS THE INITIAL DIAMETER OF THE FIRST COUNTERBORE, THE RIVET FIRST SECTION BEING RADIALLY DEFORMED TO HAVE PERIPHERAL ENGAGEMENT WITH THE FIRST COUNTERBORE, D. SAID HEAD END FACE BEING SUBSTANTIALLY FLUSH WITH THE WORK SURFACE.
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