FIELD: load handling and transportation equipment; telescopic boom cranes. SUBSTANCE: mounted on slewing platform of load lifting crane is telescopic boom and boom lifting and luffing mechanism consisting of gantry turned by means of hydraulic cylinders and boom lifting pulley block. Fixed casing of pulley block is mounted in upper portion of gantry, and movable casing is connected by equalizing sheaves and flexible ties with head and intermediate sections of boom. EFFECT: enlarged operating capabilities. 2 dwg
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