Spiral drive fastener with friction engageable surface
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United States of America Patent
Stats
-
Nov 13, 2007
Grant Date -
Oct 20, 2005
app pub date -
Apr 15, 2004
filing date -
Apr 15, 2004
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Interference surfaces are constructed on inner transition surfaces between wings of a fastener having a spiral recess. A portion of the transition surface is tapered to provide the interference. A standard driver for a spiral recess will engage the interference surface to create a 'stick fit' engagement. The punch is formed using a wire EDM operation to construct tapered surfaces within the die cavity of a hob. The hob is machined down to obtain the desired depth, which is measured up from a gage spot indicative of the sticking point.
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