HOIST Russian patent published in 1995 - IPC

FIELD: small-scale mechanization facilities. SUBSTANCE: hoist has housing 1 with hangers 2 and fitted-in rotating drum 4 with flexible traction member 5 and drum friction brake controlled by axially movable rod 16 of brake hydraulic cylinder. Drum drive has plate 13 arranged in inner space made in end face of drum 4. Plate and inner surface of space form friction pair. Fastened in plate 13 is toothed wheel 14 engaging with two toothed racks shifted by working cylinders of positive displacement hydraulic drive system connected to housing. Drive hydraulic cylinder has pedal. Cylinder communicates through two position spool valve with one of working cylinders of rotary hydraulic drive and with one of piston spaces of brake hydraulic cylinder 15; second piston space of brake hydraulic cylinder 15 and second working cylinder of rotary hydraulic drive communicate with hydraulic accumulator through safety valve shunted by non-return valve. EFFECT: enlarged operating capabilities. 2 dwg