Thread-cutting screw

Details Thread-cutting screw Thread-cutting screw

F - Mech Eng,Light,Heat,Weapons

16

B

F16B 25/00 (2006.01) F16B 33/02 (2006.01)

Patent

CA 2349358

A thread cutting screw to be screwed into a predrilled hole in concrete, masonry, or the like is characterized in that the relationship between the load bearing thread surface AOn of the loaded thread flank, which surface is standardized to the load bearing thread length he and cut into the wall of the predrilled hole, and the nominal diameter db of the predrilled hole is as follows AOn = k ~db wherein k is a constant of which the value is 1 < k <= 2.5.

L'invention concerne une vis de filetage destinée à être vissée dans un avant-trou pratiqué dans le béton, une maçonnerie ou équivalent. L'invention est caractérisée en ce que la surface de filet A0n portante du flanc de filet chargé, laquelle surface pénètre dans la paroi percée de l'avant-trou et est normalisée sur la longueur he portante du flanc de filet chargé, est en relation avec le diamètre nominal de perçage db selon la formule (I), sachant que la constante k 1 < k </=2,5.

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