ROTARY CULTIVATOR KNIFE Russian patent published in 2000 - IPC

FIELD: agriculture, in particular, cultivation of water-logged soil. SUBSTANCE: rotary knife has hub and two disk-shaped blades which are secured to hub with their projecting central part so as to face each other. Each blade is provided with ten radial triangular teeth arranged on its front edge, with one tooth being flat and remaining teeth being made of three types of configurations. Three teeth of first type are bent in simple curved line in the direction of central projecting part of blade. Three teeth of second type are bent in complicated curved line: tooth root is bent in direction away from projecting central part and apex is oriented to projecting part. Three teeth of third type are bent in simple curved line in direction away from projecting central part. Teeth are arranged in predetermined manner for providing alternate action upon soil. Front edges of flat teeth define central angle of optimum value of 105 deg. EFFECT: increased efficiency and improved quality of cultivated water-logged soil. 2 cl, 5 dwg