| 摘要 |
<p>PURPOSE:To provide a construction crane that is able to make an expansion boom constituting a crane part and its support frame perform the carrying in-and-out of material and equipment safely to or from the mid floors of a building freely from the outside at an optional position along a mast, and besides, usable at high lift. CONSTITUTION:This crane comprises a mast 10 to be erected after being supported by a support 15 from the sidepiece of a building, a support frame 20 to be equipped free of lifting motion along this mast 10, a winding machine 35 being mounted on this support frame 20 via a turning plate and an expansion boom 30, and in this constitution, a guide rail 12 and a rack 13 are installed in a side face of the mast 10, while the support frame 20 is guided by the guide rail 12 of the mast 10 and drives a gear in mesh with the rack 13 and being made free of lifting motion, and a fixed means 27 lockable at an optional position to the mast 10 is installed in this support frame 20.</p> |
