F - Mech Eng,Light,Heat,Weapons – 16 – B
Patent
F - Mech Eng,Light,Heat,Weapons
16
B
10/13, 85/47
F16B 15/00 (2006.01) B21G 3/30 (2006.01) B21H 7/18 (2006.01) B21K 1/54 (2006.01)
Patent
CA 1245083
ABSTRACT OF THE DISCLOSURE Nail-type fastener, comprising an elongated shank with a head at one end, and a point at the other end. The nail shank has three equally spaced longitudinal grooves separated by longitudinal ridges with a cross-sectionally arcuate outer side. The grooves have flat, concave or cross-sectionally V-shaped bottom surface and usually side flank surfaces arranged obliquely thereto which connect to the bottom surface via individual corners of small radius of curvature. The cross-sectional shape selected provides a nail with high flexural rigidity and high pull grip with comparatively low weight. The fastener or nail is produced starting from a cross-sectionally circular nail wire stock which is profiled in two cold-rolling steps. In the first step, the nail wire passes through a first roller trio, the rollers of which roll guide grooves of arcuate cross-section into the nail blank wire. In the second step, the nail wire passes through a second roller trio, the rollers of which engage the guide grooves centrally thereto and produce a deepening of these grooves into deep grooves. The head is then upset on one end of the shank, and a point is made at the other end of the shank, as the finished nail is thereby separated.
412307
Goudreau Gage Dubuc
Rabe Karl L.g.
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