Screw for contaminated pre-tapped holes

Details Screw for contaminated pre-tapped holes Screw for contaminated pre-tapped holes

1985-03-28

1990-11-27

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

411308, 411387, 411416, 411417, F16B 2500

Patent

active

049732099

ABSTRACT:
A locking screw having a head at one end, a special entry portion at the other end, and a trilobular shank portion extending from the entry portion toward the head. The screw is further characterized in that the thread profile is of a double angle configuration symmetrical about an axis perpendicular to the longitudinal axis of the screw. The entry section is tapered and is formed with a series of truncations which serve to clear progressively a contaminating coating in an internally threaded workpiece, such as a nut, when the screw is threaded therein.

REFERENCES:
patent: 1451484 (1923-04-01), Woodward
patent: 1909476 (1933-05-01), Trotter
patent: 2136458 (1938-11-01), Olson
patent: 2140467 (1938-12-01), Cargile
patent: 2829696 (1958-04-01), Wagner
patent: 3076208 (1963-02-01), Moore
patent: 3239710 (1966-03-01), Toporzysek
patent: 3426820 (1969-02-01), Phipard, Jr.
patent: 3504722 (1970-04-01), Breed
patent: 3878759 (1975-04-01), Carlson
patent: 4315340 (1982-02-01), Veldman
patent: 4368552 (1983-01-01), Sugiyama

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