| 摘要 |
The rivet includes a rivet body and a rivet shaft. The rivet shaft includes a shank with a head and an oval boss at opposite ends of the shank. The rivet body includes a circular flange with expandable arms extending therefrom with an oval aperture therebetween. The oval boss passes through the oval aperture and into cam grooves on the inner surface of the expandable arms. The oval boss, with its major axis positioned between the expandable arms, expands the arms apart into an installed position without the need for rotating the shaft subsequent to insertion. By turning the shaft one quarter turn after reaching the installed position, the minor axis of the oval boss is positioned between the expandable arms and the arms collapse to the uninstalled position. Additionally, complementary ramps and sheer faces on the lower surface of the head an within the countersunk nest surrounding the oval aperture inhibit relative clockwise rotation of the head in the installed position and urge the head upwardly from the flange in the uninstalled position.
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