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
Patent
1998-03-11
2000-12-12
Saether, Flemming
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
411417, 411426, F16B 2500, F16B 3504
Patent
active
061589381
ABSTRACT:
An anti-cross threading fastener having a threaded shaft portion with a major diameter and a minor diameter, a leading end shaft portion devoid of screw threads and having a diameter less than the major diameter of the threaded shaft portion. The leading end shaft portion also includes a tip having an at least partially substantially curved surface, and a groove disposed about the shaft portion between the tip portion and the threaded shaft portion. A cylindrical shaft portion may be disposed between the tip portion and the groove. A portion of the threaded shaft portion tapers narrowingly toward the tip portion thereof, and the screw threads of the tapered threaded shaft portion have a flank angle greater than a flank angle of the screw threads of a non-tapered threaded shaft portion. The tapered screw threads may be formed of spaced apart lobes.
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Camcar Textron,"Acupoint.TM. Anti-Cross-Threading Feature", known by Applicant on or about Aug. 1997, pp. 1 and 2.
Illinois Tool Works Inc
Saether Flemming
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