HYDRAULIC MANIPULATOR Russian patent published in 1998 - IPC

FIELD: material handling facilities; hydraulic manipulators and lifting devices installed on vehicle chassis. SUBSTANCE: hydraulic system of manipulator is made for operation at constant flow rate of working liquid after the pump irrespective of load. Cutoff and safety valves in main lines connecting hydraulic distributors with rod and piston spaces of hydraulic cylinders, except for support turning and grip turning hydraulic cylinders, are adjusted to preset operating pressures to prevent pressure rise to values exceeding tolerable overloads. In hydraulic cylinder of slewing device, pistons are connected with toothed rack engaging with turning gear through cylindrical pins installed for sliding, axes of pins being oriented square to plane of travel of toothed rack. Cylindrical grooves are made in pistons of all hydraulic cylinders on edges to install support piston bushings preventing wedging of pistons. Outrigger boom slewing hydraulic cylinder is hinge-secured on lifting boom and its rod engages with outrigger boom through rocker hinge-connected to lifting boom and connecting rod hinge-coupled with rocker and outrigger boom. EFFECT: enlarged operating capabilities. 4 cl, 1 dwg