CRANE FOR LIFTING AND DELIVERING LOADS INTO WINDOW APERTURE IN BUILDING Russian patent published in 1995 - IPC

FIELD: lifting and transportation facilities. SUBSTANCE: slings are secured on load to be lifted and then hoisting drive is switched on. In process of lifting hook casing reaches boom head and turns boom in vertical plane around axle. Stop comes into engagement with spring-loaded bell crank, turns the latter relative to axle and gets out of slot on eccentric cam. Load lifting operation stops. As support member of turnable bracket freely thrusts against column surface of end face eccentric cam secured on telescopic post, under the action of gravity side component of gravity force will turn bracket together with boom and hoisted load. Then load is lowered and disconnected, and bracket with boom is turned by hinged lever in initial position. EFFECT: enlarged operating capabilities. 1 dwg