Fastener system with spline recess and driving tool

B - Operations – Transporting – 25 – B

Patent

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Details

B25B 23/00 (2006.01) B25B 15/00 (2006.01)

Patent

CA 2371306

An improved fastener system includes a threaded pin (12) and a tool (16). The pin contains a recess (39) in a threaded end (36) of the pin for receiving the tool, thus holding the pin against rotation during application of a nut (14) on the pin. The recess includes splines (40a, 40b, 40c, 40d, 40e, 40f) extending around a circumference of the recess. A plurality of mating splines (26) are located on an end of the tool for engaging the slots of the recess. The splines are oriented to maximize torsional performance and to balance the shear strength of the pin with the shear strength of the tool. Additionally the ends of the recess splines and a minor diameter (28) of the tool include a matching curved surface (31) to increase torsional strength.

L'invention se rapporte à un système de fixation amélioré comportant une tige filetée (12) et un outil (16). Une extrémité filetée (36) de la tige comporte un évidement (39) conçu pour recevoir l'outil, ce qui permet d'empêcher la rotation de la tige lorsqu'un écrou (14) est placé dessus. Une circonférence de cet évidement présente des cannelures (40a, 40b, 40c, 40d, 40e, 40f). Une pluralité de cannelures d'accouplement (26) disposées sur une extrémité de l'outil sont conçues pour s'accoupler aux fentes de l'évidement. Ces cannelures sont orientées de manière à optimiser les performances en torsion et à équilibrer la résistance au cisaillement de la tige par rapport à la résistance au cisaillement de l'outil. En outre, les extrémités des cannelures de l'évidement et un diamètre mineur (28) de l'outil présentent une surface incurvée d'accouplement (31) qui permet d'accroître la résistance en torsion.

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