F - Mech Eng,Light,Heat,Weapons – 16 – B
Patent
F - Mech Eng,Light,Heat,Weapons
16
B
F16B 37/06 (2006.01) B23P 19/06 (2006.01)
Patent
CA 2467042
A self-piercing element inclunding a shank, a radial flange and a tubular barrel. The flange includes spaced concave surfaces and the annular bearing surface has an area at least four times the concave surfaces. The element is installed in a panel supported on a female die including a central die post, wherein the outer side wall is a frustoconical having an included angel between five and twelve degrees. During installation, the tubular barrel pierces an opening in the panel and the panel is drawn against the outer surface of the tubular barrel is deformed into a U-shape. The flange is simultaneously received in the die cavity and the panel is incrementally deformed radially into the concave surfaces between the frustoconical side wall and the flange portion providing improved torque resistance.
Un élément autotaraudeur comprend une tige, une collerette radiale et un cylindre tubulaire. La collerette comporte des surfaces concaves espacées, et la surface de support annulaire comporte une zone au moins quatre fois plus étendue que les surfaces concaves. L'élément est installé dans un panneau reposant sur une matrice femelle comprenant un tenon de matrice central, la paroi latérale extérieure étant un élément tronconique qui présente un angle compris entre cinq et douze degrés. Pendant l'installation, le cylindre tubulaire taraude le panneau pour y former une ouverture, le panneau étant ramené contre la surface externe du cylindre tubulaire, ledit cylindre étant déformé de manière à former un "U". La collerette rentre simultanément dans la cavité de la matrice, et le panneau est déformé radialement par incréments de manière à former des surfaces concaves entre la paroi latérale tronconique et la partie collerette en assurant ainsi une meilleure résistance au couple.
Fabristeel Products Inc.
Gowling Lafleur Henderson Llp
Whitesell International Corporation
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