| 摘要 |
PURPOSE: A ladder extension structure of a ladder truck is provided to convert the structure to increase the applicability when the operation at a building having less than four floors. CONSTITUTION: A ladder extension structure of a ladder truck comprises a hydraulic cylinder(70), a winch(80), a tow step ladder(20), a three step ladder(30), and a four step ladder(40). The hydraulic cylinder is combined with a single step ladder(10) at both right and left terminal. A first roll are connected and fastened in a rod(75) end of the hydraulic cylinder. The winch is combined with the single step ladder one side. The two step ladder is combined with the inside of the single step ladder. Two second rolls are connected on the top side of the two step ladder. The three step ladders are combined inside the two step ladder. The four step ladder is combined inside the three step ladder. Two of fourth rolls are formed on the lower part of the four step ladder. |
