with means for automatically varying the effective length of the hoisting rope or cable

Full Title

Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes (base supporting structures with legs B65C5/00) > with jibs mounted for jibbing or luffing movements > and adapted to move the loads in predetermined paths > the paths being substantially horizontal; Level-luffing jib-cranes > with means for automatically varying the effective length of the hoisting rope or cable