Screw, driver bit and header punch for manufacture of screw

Details Screw, driver bit and header punch for manufacture of screw Screw, driver bit and header punch for manufacture of screw

F - Mech Eng,Light,Heat,Weapons

16

B

F16B 23/00 (2006.01) B21K 1/48 (2006.01) B25B 15/00 (2006.01)

Patent

CA 2269723

A driver bit and a header punch for manufacture of screws comprising a screw comprising substantially vertical end wall portions of predetermined depth formed on an end edge portion of a bit fitting groove on a screw head, non-planar bottom portions raised from lower edge portions of the vertical end wall portions toward a center of the screw head, inclined groove portions extending from raised portions of the non-planar bottom portions toward a center of a screw neck, a substantially conical-shaped bottom surface formed on a bottom of the groove, the bit fitting groove being adapted to a driver bit, which has a blade adapted to be fitted into the bit fitting groove and has a lower edge portion of the blade adapted to abut against the non-planar bottom portions . In this manner, groove portions of a cross groove on the screw are improved in construction, whereby it is possible to effectively prevent a driver bit from coming out, prevent breakage of screws caused in the prior art, always achieve an appropriate and rapid screw fastening work even when the cross groove of the screw is broken, and to significantly enhance an efficiency in work.

Cette invention concerne une lame de tournevis ainsi qu'un emboutisseur destinés à la fabrication de vis. La vis comprend des parois d'extrémité globalement verticales et d'une profondeur prédéterminée qui sont formées sur le bord d'extrémité d'une gorge d'insertion de la lame sur la tête de la vis. Des parties de fond non planes s'élèvent des bords inférieurs des parois d'extrémité verticales en direction du centre de la tête de la vis. Des gorges inclinées partent des parties élevées des parties de fond non planes et vont jusqu'au centre du col de la vis, tandis qu'une surface de fond de forme globalement conique est formée sur le fond de la gorge. La gorge d'insertion de lame s'adapte à la lame d'un tournevis qui est prévue à cet effet et qui possède un bord inférieur qui va entrer en butée contre les parties de fond non planes. Les gorges formant la croix sur la vis possèdent ainsi une meilleure structure qui empêche efficacement la lame du tournevis d'en sortir. Cette structure permet en outre d'éviter la rupture de la vis jusqu'alors courante, de fixer une vis rapidement, de manière appropriée et en toute occasion même lorsque la croix de la vis est brisée, et d'améliorer ainsi sensiblement l'efficacité du travail.

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