Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – Having securing element projecting through aperture in sleeve
Patent
1985-04-22
1987-01-13
Holko, Thomas J.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
Having securing element projecting through aperture in sleeve
411140, 411216, 411253, 411255, 411292, 411322, 411342, 411422, F16B 1304, F16B 3902
Patent
active
046361219
ABSTRACT:
A holding screw rotatable in an inward direction having means to prevent or retard rotational movement in the opposite direction. The screw device includes a conventional screw body having external helical threads to move the screw inwardly by rotating in one direction, a central cylindrical cavity in the screw body opening to the screw head, angled ports extending through the side wall of the screw body opening to the central cavity, an elongated longitudinally movable retaining member in the central cavity having spring biased arms positioned along its shank normally biased outwardly therefrom diagonally at an acute angle facing toward the screw head but resiliently foldable against the shank of the elongated member when it is pushed into the cylindrical central cavity, the free ends of the spring biased arms being in registration with respective ones of said angled ports, a coiled spring in the bottom closed end of the cylindrical central cavity which is compressed when the elongated retaining member is fully seated in the cylindrical cavity, and a short set screw threaded into the open end of the cylindrical cavity to hold the retaining member fully seated therein. In use, the holding screw is screwed in place in a piece of wood or other appropriate material, the set screw removed from the open end of the cylindrical cavity allowing the compressed coil spring to urge the elongated retaining member toward the open end whereupon the free ends of the spring biased arms enter the angled ports and move therethrough to extend outwardly from the side wall of the screw as the elongated retaining member is urged outwardly, thereby engaging the material in which the screw is seated to resist rotation thereof in the direction of becoming loosened or unseated.
REFERENCES:
patent: 791373 (1905-05-01), Shaffer
patent: 1162266 (1915-11-01), Weiss
patent: 2396276 (1946-03-01), Lang
patent: 2408560 (1946-10-01), Keehn
patent: 3534650 (1970-10-01), Kubokawa
Holko Thomas J.
Kettelson Ernest
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