Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Thread or shank structure
Patent
1993-11-23
1996-10-29
Saether, Flemming
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Thread or shank structure
411307, F16B 3504
Patent
active
055690092
ABSTRACT:
The screw of this invention can be used for fastening members of a variety of materials and reliably prevent loosening of the screw. The screw shank is formed with two threads, a main thread for driving the screw and a sub-thread which extends in the same direction as the main thread, is smaller in outer diameter than the main thread and has a pitch different from the main thread. The inclination of the slant surface of the sub-thread is set steep on the loosening side and moderate on the fastening side. The pitch of the main thread is set larger than that of the sub-thread. When the tightened screw is applied a loosening torque, the sub-thread bites into the inner wall of the hole, preventing the screw from being loosened.
REFERENCES:
patent: 635297 (1899-10-01), Caldwell
patent: 1230603 (1917-06-01), Richmond
patent: 1827615 (1931-10-01), Rosenberg
patent: 3207023 (1965-09-01), Knohl
patent: 3682507 (1972-08-01), Waud
patent: 5294227 (1994-03-01), Foster
Kabushiki Kaisha Suzuki Rashi Seisakusho
Saether Flemming
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