Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Threaded fastener locked to a discreet structure – Nut – and means to engage substructure on its opposite faces...
Patent
1995-04-17
1996-12-03
Lindsey, Rodney M.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Threaded fastener locked to a discreet structure
Nut, and means to engage substructure on its opposite faces...
411308, 411399, 411423, F16B 39282
Patent
active
055801994
ABSTRACT:
A fastening screw is provided with a locking function to prevent loosening thereof after being tightened. In one aspect of the invention, the fastening screw has a head having a bearing face; a plurality of convex portions and concave portions formed on the bearing face to provide shallow wavelike portions proceeding in a circumferential direction of the bearing face; and a thread portion having a flat top portion, the width of the flat portion being larger than that of a root of a thread portion of an internal thread, wherein the angle between a slant surface of the fastening screw on a screw-tightening side and a line vertical to an axis of the fastening screw is substantially equal to the angle between a slant surface of the internal thread on a screw-loosening side and the line vertical to the axis of the fastening screw, and the angle between a slant surface of the fastening screw on the screw-loosening side and the vertical line is smaller than the angle between the slant surface of the fastening screw on the screw-tightening side and the vertical line.
REFERENCES:
patent: 2128757 (1938-08-01), Olson
patent: 2152681 (1939-04-01), Caminez
patent: 2562032 (1951-07-01), Gutensohn
patent: 3530760 (1970-09-01), Lindstrand
patent: 3701372 (1972-10-01), Breed
patent: 3877339 (1975-04-01), Muenchinger
patent: 4294300 (1981-10-01), Bouwman
Kabushiki Kaisha Suzuki Rashi Seisakusho
Lindsey Rodney M.
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