WORKING TOOL OF SOIL-TILLING MACHINE Russian patent published in 1994 - IPC

FIELD: rototilling of soil. SUBSTANCE: working tool comprises cutter holder rotating around vertical axis, and cutter. Cutting edge of cutter extends along a helical curve disposed on cylindrical surface with a constant helix angle and its front lower curved end is directed forward along rotor rotation ω while cutter back side is turned relative to the perpendicular towards rotation radius to center through an angle exceeding 15 deg but smaller than 45 deg. EFFECT: reduced soil cutting force. 9 dwg