TACKLE BLOCK Russian patent published in 2002 - IPC

FIELD: mechanical engineering; lifting and transportation facilities. SUBSTANCE: invention relates to lifting devices designed for lifting long heavy-weight and it can be used also for transportation of loads. Proposed tackle block has standing and running blocks rotating around their axles over which cable or chain is passed. One or both ends of cable or chain are connected to corresponding load gripping members or drums of load-lifting mechanisms, winches or other pulling devices. Free end of cable or chain not connected to said devices is secured to fixed support or anchor. In this case standing blocks are secured on fixed supports or anchored in ground. According to invention, running blocks are furnished with individual casings to which slings, pulling cables or corresponding load gripping members are connected. At least two of these blocks are installed, particularly, on ends of tackle block frame to take up weight of tackle both frame or transmit traction force to frame and to provide displacement of frame when operating with tackle block. Other running blocks with casings are arranged in guides of tackle block frame to preclude contact of running blocks and their casing with other parts of tackle block frame when tackle block is used for lifting and pulling load over surface. Guides of frame can be made for displacement of running blocks with casings arranged in guide along frame. EFFECT: enlarged operating capabilities, increased load lifting and pulling capacity, reduced cost. 2 cl, 6 dwg