Fastener having a lobular cross section and ridges along the...

F - Mech Eng,Light,Heat,Weapons – 16 – B

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F16B 25/00 (2006.01) B21H 3/02 (2006.01) F16B 33/02 (2006.01)

Patent

CA 2339790

A fastener is constructed having four thread zones (4, 5, 6, 7) constructed over the length of the fastener (1), from the head (2) to the tip (10), namely a ridged cylindrical holding zone (4), a ridged cylindrical transition thread forming zone (5), a rectilobular tapered thread forming zone (6), and a rectilobular alignment zone (7). The pitch cross section of the thread varies in each zone.

La présente invention concerne une vis présentant par construction quatre zones de filetage (4, 5, 6, 7) se répartissant sur la longueur de la vis (1), depuis la tête (2) jusqu'à la pointe (10). Ces quatre zones sont en l'occurrence une zone de tenue cylindrique à rives (4), une zone de formation de filet de transition cylindrique à rives (5), une zone de formation de filet effilée rectilobulaire (6), et une zone d'alignement rectilobulaire. La coupe du pas de filetage varie d'une zone à l'autre.

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