Patent ID: 6325583
Filing Date: 2001-12-04
Classification: E04B,E04D,E04F,F16B

Abstract:
A screw with a shank provided at least partly with a thread, a boring and/or penetrating point and a head equipped with a tool drive for fastening wooden laths to a roof or wall substructure comprising wood among other alternatives, characterized in that one threaded portion (2, 3) each adjoining at least the boring and/or penetrating point (6) and the head (5) is provided on the shank of the screw (1), and these two threaded portions (2, 3) have the same major diameter (DA) but different thread pitches, in that the outside diameter of the head (5) is as large as or slightly larger than the major diameter (DA) of the threaded portions (2, 3), in that a shank portion (4) disposed between the two threaded portions (2, 3) associated with the end regions of the shank is thread-free and in that the thread-free shank portion (4) diameter corresponds at least approximately to the minor diameter (DK) of the two threaded portions (2, 3).