LIFTING CRANE AUTOMATICALLY FOLDING BOOM Russian patent published in 1997 - IPC

FIELD: mechanical engineering; materials handling facilities. SUBSTANCE: boom 10 has base 11, intermediate folding member 12 and boom head 13 hinge-connected to each other in points 14, 15 at level of lower beams of these members. Boom intermediate folding member 12 is connected with boom base 11 by means of mechanized unit 36 which controls its turning around axis of hinge joint 14. Boom head 13 is connected with base 11 by means of connecting system 40 consisting of three hinge-connected members. Central curved lever of connecting system is hinge-coupled with fixed point of boom intermediate folding member 12. thus providing turning of boom head 13 around axis of hinge joint 15. EFFECT: enlarged operating capabilities. 9 cl, 6 dwg