Wood screw

Details Wood screw Wood screw

F - Mech Eng,Light,Heat,Weapons

16

B

F16B 25/00 (2006.01) F16B 25/10 (2006.01)

Patent

CA 2392892

A wood screw is provided which can be smoothly driven in with a small driving force. Helical ribs that are the highest at the center and gradually lower toward both ends are formed on the outer periphery of the tip of a shank having threads on the outer periphery at intervals of 1800 in the circumferential direction. Each helical rib is a discontinuous body formed by a plurality of protrusions having different heights. This reduces the turning resistance imparted to the helical ribs, thereby reducing the driving force required.

Est décrite une vis à bois qui peut être enfoncée en douceur à l'aide d'une faible force d'enfoncement. Des nervures hélicoïdales plus épaisses au centre et s'amincissant progressivement vers les extrémités sont formées sur la périphérie extérieure de la pointe de la tige qui est filetée sur sa périphérie extérieure, les nervures étant placées à des intervalles de 180 degrés dans la direction circonférentielle. Chaque nervure hélicoïdale est formée de manière discontinue d'une pluralité de renflements de différentes hauteurs. Ces renflements réduisent la résistance à la rotation imprimée aux nervures hélicoïdales, ce qui réduit la force d'enfoncement requise.

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