STRAIGHTENER Russian patent published in 2017 - IPC E04F21/00 

FIELD: construction.

SUBSTANCE: straightener contains a body made of tetrahedral monolithic hollow profile of the trapezoidal cross-section with working surface including straight longitudinal wedge-shaped edge rounded along the entire length with R radius and forming an acute angle with flat back surface. On the flat back surface, the holder is made in form of longitudinal groove. The wedge-shaped edge is rounded along the entire length with a radius of at least 2R. Inside the hollow profile, at the junction point of the working surface and the flat back surface, a partition connecting the working surface and the flat back surface, perpendicular to the angle bisector, and forming a monolithic massive together with the working surface and the flat back surface. The distance from the partition boundary to the periphery of the wedge edge rounding along the angle bisector line is not less than 6R.

EFFECT: increased operation durability.

2 dwg