| 摘要 |
A blind rivet with a deformable annular clamping ridge around the leading end of the expansion section of the setting pin, with a tapered leading face and a crest diameter a few thousandths of an inch larger than the inside diameter to which the sleeve of the rivet is to be expanded, thereby to provide a high momentary clamping force against the workpieces to be riveted, greater bearing area as a result of the greater initial effective diameter, and a better hole filling because of the excess material provided by the ridge. The ridge may be of the same material as the remainder of the head, to be deformed as an incident to wire-drawing elongation of the head, or may be a soft-coating applied to a harder core material. Alternatively, the ridge may be formed as part of a locking collar disposed about the setting pin, abutting the leading end of the expansion head, and including a forwardly projecting skirt that is deformable into a recess in the rivet head to lock the pin in place in the rivet sleeve when the rivet is set.
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