WORKING TOOL OF PLOW-TYPE TRENCHING MACHINE Russian patent published in 1994 - IPC

FIELD: earth-moving machines. SUBSTANCE: horizontal sections of body are drawn by lines of alternating curvature, concave along motion in lower part of body and convex in its upper part. Zero-curvature section is disposed on a height larger than the depth of recess, the curvature of each section being maximum on blade jointing line and diminishing towards side edges. Elimination of soil wedging between blade and monolith reduces draft resistance with resultant saving of fuel. EFFECT: lower draft resistance. 2 cl, 2 dwg