FOLDING CRANE Russian patent published in 1995 - IPC

FIELD: materials handling facilities. SUBSTANCE: crane with three-member boom has motorized cable 45 for folding and unfolding of boom members which couples boom second member with boom base by means of set of jibs 16 and 26. Cable 45 secured in point 46 in top of rear jib 16 located on boom base forms complex block 60 between top 34 of front jib 26 located on boom second member and top 21 of rear jib 16 being successively passed sheaves 47,49,50,53,55,56 and 57 arranged symmetrically, and then over set of sheaves 58 and 59 secured on top of rear jib 16; then cable is wound on drum of which 44 providing folding and unfolding of boom. Winch is installed on rear end of boom base. EFFECT: enlarged operating capabilities. 6 cl, 13 dwg