DEFORMED BAR Russian patent published in 1995 - IPC

FIELD: construction. SUBSTANCE: deformed bar has core with ellipse cross-section and inclined sickle-shaped ribs located on core surface. Rib tops are confined by circumference whose diameter is equal to large axis of ellipse of core cross-section. Ellipse small-to- large axes ratio is 0.7-0.85, and ratio of distance between foci of ellipse to its large axis is 0.58-0.62. Inclined protrusions follow pattern oif multistart helical line with pitch equalling 0.7-1.2 of profile nominal diameter and oriented at angle of 40-60 deg. to rod longitudinal axis, and their width amounts to 0.09-0.11 of profile nominal diameter. Besides, multistart helical line has right-hand start on one rod semisurface, and left-hand start on the other rod semisurface. EFFECT: higher efficiency. 2 cl, 2 dwg