Self-tapping screw

Details Self-tapping screw Self-tapping screw

1992-11-23

1994-03-15

Wilson, Neill R.

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

411412, 411426, F16B 2500, F16B 3504

Patent

active

052942279

ABSTRACT:
A self-tapping screw has a cutting thread formed by two separate threads (3, 4). An imaginary envelope (5) defines a annular space (5) laterally enclosing the screw shank and has a section (5a) tapering inwardly along an inwardly tapering leading end section (1a) of the shank (1). The inwardly tapering section of the annular enclosing space an envelope forms an angle (B) considerably larger than the angle (A) formed by the tapering leading end section (1a) of the shank. The leading ends (3a, 4a) of the separate threads (3, 4) are located diametrically opposite one another for uniform distribution of the forces developed when the screw penetrates into a hard receiving material, such as concrete, masonry, gas concrete and the like.

REFERENCES:
patent: 3207023 (1965-09-01), Knohl
patent: 3937119 (1976-02-01), Ernst
patent: 3942405 (1976-03-01), Wagner
patent: 4323326 (1982-04-01), Okada et al.
patent: 4655661 (1987-04-01), Brandt
patent: 5061136 (1991-10-01), Dixon et al.

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