| 摘要 |
<p>AN IMPROVED ROPE ATTACHMENT ON EXTENSION BOOM FOR PICK AND CARRY TYPE CRANE An improved rope attachment on extension boom for pick and carry type crane attachment and routing arrangement related to a crane boom assembly comprising of a fixed outer boom with at least two or more extension booms, (a) the first extension telescopically with a hydraulic cylinder and (b) a second extension boom provided with a pair of extension and retraction ropes, the extension rope being attached to one side of the fixed outer boom at its one end and is routed over a pulley fixed on the same side of the front side of the first extension boom, the said extension rope from the other side of the second extension boom being routed back to the fixed outer boom through another pulley on the first extension boom, and the said retraction rope being routed similarly from the fixed outer boom to the second extension boom through the said first extension boom and back to the fixed outer boom.</p> |
