Thread-cutting screw

Details Thread-cutting screw Thread-cutting screw

1990-04-19

1991-09-03

Wilson, Neill R.

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Having structure to restrict rotation of threaded, mating...

Comprising a thread lock

411386, 411417, F16B 3930

Patent

active

050448536

ABSTRACT:
A thread-cutting screw where the edge of the screw is at least partially undulating. The undulating edge has recesses in the shape of a parabola interrupting the flank face of the thread. The recesses are asymmetrical so that the front flank face of the recess in the screw-in direction is steeper than the rear flank face in the screw-in direction, so that unscrewing the screw is more difficult than screwing-in the screw.

REFERENCES:
patent: 3247877 (1966-04-01), Evans
patent: 3370501 (1968-02-01), Angingh
patent: 3982575 (1976-09-01), Ollis, Jr. et al.
patent: 4259889 (1981-04-01), Capuano
patent: 4645396 (1987-02-01), McCauley et al.
patent: 4818165 (1989-04-01), Shirai

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