Timber Concrete Composite Screw

Abstract: a screw includes a shank which has a tip end and a rear end. a concrete thread and a timber thread are disposed on the shank. the concrete thread and the timber thread are helically aligned with one another and the concrete thread reaches further to the tip end than the timber thread. the timber thread has an engagement zone which includes at least one turn of the timber thread and, in the engagement zone, the timber thread becomes wider with decreasing distance from the rear end.

Inventor(s): Roland SCHNEIDER

CPC Classification: F16B25/0031 ({the screw being designed to be screwed into different materials, e.g. a layered structure or through metallic and wooden parts})

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