| 摘要 |
PURPOSE: A driving device of a boom assembly for a crane is provided to reduce manufacture costs and weight by minimizing a number of cylinders to be used for drawing in and out a boom assembly. CONSTITUTION: A driving device of a boom assembly for a crane comprises a first cylinder(210), a second cylinder(220), a first wire(310), a first pulley(311), a second wire(810), and a second pulley(811). The first cylinder has a first rod(201) and a first cylinder body(203). The second cylinder has a second rod(202) and a second cylinder body. One end of the first wire is coupled to a main boom(101) and the other end thereof is coupled to a second access boom(103). The first pulley is installed in a first access boom(102) and guides the first wire. One end of the second wire is coupled to the second access boom and the other end thereof is coupled to the main boom. The second pulley is installed in the first access boom and guides the first wire.
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