PLOUGH ASSEMBLY Russian patent published in 1994 - IPC

FIELD: hydraulic engineering. SUBSTANCE: plough assembly has case provided with tool heads, hydraulic cylinders, mechanism for driving case provided with hauling chain, conveyer, source for supplying working liquid and hydraulic distributors. Tool heads are mounted for restricted axial motion relatively the case. Hydraulic cylinders are placed inside the case. Rods of the hydraulic cylinders are connected with corresponding tool head. Piston cavities of hydraulic cylinders are connected one to another hydraulically and with pressure or drain line through two-position hydraulic distributor. Rod cavity of any hydraulic cylinder is connected hydraulically with pressure or drain line through three-position hydraulic distributor, or with rod cavity of the second hydraulic cylinder and with drain line. EFFECT: improved efficiency of operation. 3 cl, 3 dwg