DEVICE FOR FIXATION AND TIGHTENING OF THREADED FASTENING ELEMENTS, FOR INSTANCE SCREWS Russian patent published in 2009 - IPC B25B15/00 F16B23/00 F16B35/06 

FIELD: construction.

SUBSTANCE: invention is related to facilities for connection of metal structures and may be used for fastening and tightening of threaded fastening elements. In device for fixation and tightening of threaded fastening elements tip is arranged in the form of volumetrical body formed by crossing of two similar truncated trihedral pyramids with creation of isosceles trapezoid in the plane of their crossing. Large bases of truncated pyramids represent isosceles triangles similar to each other and located in single plane, tops of which are directed mutually to the side of bases of each other, their according heights are located on the same straight line, value of angle α at mentioned tops of isosceles triangles is in the range of angles from 1° to 45°. Smaller bases of truncated pyramids are also located in the same plane, which is parallel to plane of larger bases. Opposite side facets of truncated pyramids and plane of pyramids crossing in the form of isosceles trapezoid are located in the opposite planes. Angle β at the top of triangles of parallel side facets of truncated pyramids is connected to angle α by the following ratio β=2arctg [IB/ID·tg(α/2)], where IB is height of triangles that create opposite side facets of truncated trihedral pyramids, ID is height of isosceles triangles that form larger bases of pyramids.

EFFECT: reliability of joint between fastening element head and tool tip is increased.

5 dwg