Screw for contaminated pre-tapped holes

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

1989-12-21

1991-03-19

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

411387, 411411, F16B 2500

Patent

active

050006380

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: 3207024 (1965-09-01), Sommer
patent: 3370501 (1968-02-01), Ansingh
patent: 3520343 (1970-07-01), Evans
patent: 3942406 (1976-03-01), Egner
patent: 3978760 (1976-09-01), Muenchinger
patent: 4028987 (1977-06-01), Wilson
patent: 4069730 (1978-01-01), Gutshall
patent: 4104446 (1978-08-01), Johnson
patent: 4486135 (1984-12-01), Kazino

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