| 摘要 |
PROBLEM TO BE SOLVED: To suspend divided booms by using a crane main body. SOLUTION: This self-travelling power crane has a mast 2, the crane main body 3 and a boom 4. The crane main body has a turning frame 5 provided in the mast 2, a boom support frame 11 pivotally fitted to the turning frame, and an A frame 12 stood in the top surface of the boom support frame. The A frame 12 is formed of a compression member 12A and a tension member 12B, and base ends of the compression member 12A and the tension member 12B are pivotally fitted to a tip and a base end of the boom support frame. The tension member is divided into an upper part and a lower part at an intermediate part thereof, and pivotally fitted through a connector pin 18 freely to be folded. Pin holes 12e and 12d are bored at a tip of one member 12b of the tension members and at an intermediate part of the other member 12a, and the members 12a and 12b are straightly fixed or folded by inserting/drawing a fixing pin 19 into/from the pin holes. COPYRIGHT: (C)2004,JPO&NCIPI
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