Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Impact driven fastener – e.g. – nail – spike – tack – etc. – Including integral locking means
Patent
1980-10-09
1982-02-16
Goldberg, Howard N.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Impact driven fastener, e.g., nail, spike, tack, etc.
Including integral locking means
10152T, 72 88, 411416, B21H 302, B21H 308
Patent
active
043153402
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.
REFERENCES:
patent: 3171146 (1965-03-01), Moss et al.
patent: 3180126 (1965-04-01), Carlson
patent: 3209383 (1965-10-01), Carlson
patent: 3772720 (1973-11-01), Yamamoto
patent: 3878759 (1975-04-01), Carlson
patent: 4040328 (1977-08-01), Muenchinger
patent: 4136416 (1979-01-01), Thomas
Eley Timothy V.
Goldberg Howard N.
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