TRENCHING MACHINE Russian patent published in 1994 - IPC

FIELD: earth-moving machinery. SUBSTANCE: trenching machine includes back pull shovel and trailer truck with hydraulic cylinders installed vertically which bodies are made fast to upper frame of trailer truck. Rods of hydraulic cylinders are provided with tin and are interconnected with the use of lower frame fitted with rotary cross-piece and hydraulic cylinder interacting with the latter. Dipper of shovel has rest on rear wall mounted for interaction with cross-piece in process of earth digging. For operation pit is dug in advance and rods of hydraulic cylinders are lowered into it and are put deeper into bottom of trench. When digging cross-piece interacts with dipper providing for increased digging effort. EFFECT: enhanced operational efficiency and reliability. 2 cl, 3 dwg