Assymetrically shaped thread forming screw and method of making

Details Assymetrically shaped thread forming screw and method of making Assymetrically shaped thread forming screw and method of making

1983-10-26

1985-08-13

Smith, Gary L.

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

Externally threaded fastener element, e.g., bolt, screw, etc.

Pilot end having means enhancing fastening or installation

411416, 411412, 10 10R, 10152T, F16B 3930, B21K 156

Patent

active

045346909

ABSTRACT:
A thread forming screw made from a blank which has a tip with an assymetrical cross-section comprised of two oppositely disposed inner surfaces which gradually merge with two oppositely disposed outer surfaces. The inner surfaces may be arcuate or generally flat or a combination thereof. The inner and outer surfaces are generally parallel to each other and to the axis of the screw so that, when rolled, the tip has generally fully formed sharp crested threads which gradually deform workpiece material upon insertion and axially advancing rotation in a bore. The reduced frictional contact is achieved because of substantial unthreaded portions on the inner surfaces. Improved gripping action results from the formation of full threads which extend substantially the full length of the fastener.

REFERENCES:
patent: 3180126 (1965-04-01), Carlson
patent: 3530760 (1970-09-01), Lindstrand
patent: 3683437 (1972-08-01), Larson
patent: 3850074 (1974-11-01), Simons
patent: 3878759 (1975-04-01), Carlson
patent: 4104446 (1978-08-01), Johnson
patent: 4368552 (1983-01-01), Sugiyama

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