DIGGER-LEVELER WITH TELESCOPIC BOOM EQUIPMENT Russian patent published in 1997 - IPC

FIELD: building machine production. SUBSTANCE: digger-leveler with telescopic boom equipment includes self-moving chassis, rotary platform, telescopic boom comprising movable and immovable sections and inclined portion of boom immovable section, boom extension mechanism, bucket revolving mechanism, hydraulic lines and regulating valves of the hydraulic cylinders. The boom is provided with swivel mechanism and inclined portion of its immovable section is made in the form of a gantry. Immovable boom section is installed inside the gantry so as to be revolved around lengthwise axis. Body of the boom extension mechanism is installed to the gantry, and there are the first, second and third hydraulic line inlets in the body, and the fourth and fifth outlets are placed in the rod. There is internal cavity in the rod. Central pipeline connected to the fifth outlet is placed in the cavity. The second central pipeline is placed inside the central pipeline. The fourth and fifth outlets are connected to bucket swivel hydraulic cylinder through external pipeline. Regulating valves of both hydraulic cylinders are connected to the third and first inlets of boom extension hydraulic cylinder. Boom swivel mechanism may be made in the form of hydraulic motor connected to planetary gear secured to the gantry. EFFECT: higher productivity. 2 cl, 3 dwg