Method and apparatus for making a self-thread creating fastener
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United States of America Patent
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-
Feb 16, 1982
Issued Date -
N/A
app pub date -
Oct 9, 1980
filing date -
Aug 17, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A thread forming screw having a helical thread and a tapered lead-in section with a polygonal cross section is formed from a conventional blank by rolling the blank between a pair of thread rolling dies having means thereon to form alternating convex lobes and concave relief areas in the frusto-conical surface of the blank. Thus, the screw may be formed with a polygonally shaped threading end without a prior working of the blank's frusto-conical surface. Curved ramp surfaces smoothly interface the lobes and concavities to allow metal in a workpiece being threaded to roll into the concavities thereby reducing the torque needed to form a thread in the workpiece.
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