SCREW WITH PROFILE-SHAPING THREAD Russian patent published in 2008 - IPC F16B25/00 F16B33/02 

FIELD: construction.

SUBSTANCE: screw has threaded rod with element of force application for transfer of torque and conical end. Threaded rod consists of cylindrical rod and profile-shaping thread itself. Thread is arranged as relief that passes along screw line on cylindrical rod, and the relief is limited with two side walls that meet in external threaded edge, with height (H) that is measured in radial direction from cylindrical rod to threaded edge. Thread has, in zones of wave crests of threaded edge that are not interrupted with bends, accordingly, preset, formed between the side walls, the first angle (α) of profile, and in the deepest zone of threaded edge wave cavities - the second angle (α') of profile. At least one of two sides of thread, at least on part of area between cylindrical rod and threaded edge, as evident in radial profile, is arranged as concave so that the first angle (α) of profile is less than angle (α_F) of sides, which is available between imaginary straight lines (FG) of sides and determined, accordingly, with thread base (GF) and threaded edge.

EFFECT: lower screwing torque.

27 cl, 15 dwg