Steel fastener having grooved shank

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

Patent

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Details

F16B 15/06 (2006.01) F16B 15/00 (2006.01) F16B 33/02 (2006.01) F16B 33/06 (2006.01)

Patent

CA 2202015

A steel fastener has an elongate shank, an enlarged head formed at one end of the shank, and a generally pointed tip formed at the other end of the shank. A grooved portion of the shank is formed with helical grooves defining helical ribs and with annular grooves defining annular rings. The shank has a cylindrical portion between the grooved portion and the tip and a cylindrical portion between the grooved portion and the head. Each of the annular grooves has a root where deepest and each of the annular rings has a crest where largest. The roots define an imaginary cone diverging toward the tip. The crests define an imaginary cone converging toward the tip. The shank has an exterior surface coated with a polymeric coating, which is formed from an aqueous composition containing a water-based acrylic resin and a water-based polyurethane resin. A zinc layer anda chromate conversion layer are provided between the polymeric coating and the exterior surface of the shank.

Article de fixation en acier comportant une tige, une tête élargie à une extrémité de la tige et un bout généralement pointu à l'autre extrémité de la tige. Une partie rainurée de la tige comporte des cannelures hélicoïdales définissant des nervures hélicoïdales et des rainures annulaires définissant des anneaux circulaires. La tige comprend une partie cylindrique entre la partie cannelée et la pointe ainsi qu'entre la partie rainurée et la tête. Le diamètre minimum de chaque rainure annulaire correspond à l'endroit le plus profond, et le diamètre maximum de chaque anneau circulaire correspond à l'endroit le plus large. Les fonds des rainures définissent un cône imaginaire divergeant vers la pointe, et les sommets définissent un cône imaginaire convergeant vers la pointe. La tige comporte une surface extérieure revêtue d'une couche polymère formée d'une composition aqueuse contenant une résine acrylique à base d'eau et une résine de polyuréthanne à base d'eau. Une couche de zinc et une couche de conversion de chromate se trouvent entre la couche polymère et la surface extérieure de la tige.

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