Patent ID: 6991275
Filing Date: 2006-01-31
Classification: B66C

Abstract:
1. A bottom block system for handling a given maximum load and for forming bottom blocks with different capacities for cranes, said system comprising: four individual sheave blocks, each said sheave block comprising a plurality of sheaves; two intermediate links, each said intermediate link being connectable to a pair of individual sheave blocks to form a double sheave block, at least one of said intermediate links having a first bearing connection with connecting dimensions; a first leveling link connectable to respective said intermediate links by a pair of first horizontal swivel joints, each said first horizontal swivel joint having connecting dimensions which correspond to the connecting dimensions of said first bearing connection; a second leveling link connectable to said first leveling link by a joint block having a vertical axis of rotation and at least one horizontal axis of rotation; a pair of bearing blocks connectable to said second leveling link by a pair of second horizontal swivel joints, each said second horizontal swivel joint having connecting dimensions which correspond to the connecting dimensions of the first horizontal swivel joints; and a pair of load hooks connectable to said second leveling link by respective said bearing blocks, each said load hook being rotatable about a vertical axis of rotation in the respective bearing block, each said load hook being capable of handling at least half of the maximum load.