BLADE WITH PROTRUSIONS Russian patent published in 1999 - IPC

FIELD: blades used in apparatuses, equipment, machine tools, manual tools for rough working of wood material, for example working members for chopping, cutting, hewing and other rough working of wood or other materials with similar mechanical or technological properties. SUBSTANCE: blade has web with cutting edge and recesses placed on portions of lateral surfaces of web being in force contact with worked material. Protrusions or thickened portions with circular base (each having width 1-40 mm and height 1-40 mm or diameter 1-40 mm and height 1-40 mm) are arranged on lateral surface of blade web and they are also in force contact with worked material. In variant web of blade has protrusions or thickened portions. Total area of outer surface of protrusions or thickened portions arranged in one side of lateral surface of web is equal or less than total area being in force contact with worked material of side of web with protrusions or thickened portions. EFFECT: improved design providing high efficiency at chopping wood in farm and at other household works such as dressing operations due to versatility of blade, its lowered contact surface and therefore reduced friction losses between blade and wood. 8 cl, 7 dwg