Fastener mandrel and method
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United States of America Patent
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-
Nov 13, 1990
Grant Date -
N/A
app pub date -
Nov 1, 1989
filing date -
Nov 1, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A fastener for securely fastening a plurality of members having a sleeve with a generally tubular portion and a flange extending radially from one end of the tubular portion and having a mandrel with an enlarged head and a generally cylindrical stem, the stem having a grooved locking section in which the locking groove has a longitudinal component and an adjacent tapered section containing a breakneck groove, the tapered section tapering radially outward toward the mandrel head and ending in a shoulder having an outer diameter signal to or greater than that of the locking section to provide a surface for improved retention of the mandrel with respect to the sleeve when the fastener is installed.
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