| 摘要 |
PROBLEM TO BE SOLVED: To provide a telescopic boom capable of quickly responding to even a demand of any specification by easily changing a standard specification and an auxiliary jib specification. SOLUTION: This telescopic boom 1 is provided for installing a bracket 10 and a searcher hook (the auxiliary jib) 20 by using a space between a pair of mutual pulleys 4 installed on its tip boom 2. This bracket 10 has an insertion opening 12 capable of inserting a base end 24 of the searcher hook 20, and an angle fixing hole 14 for fixing an angle of the searcher hook 20. On the other hand, the auxiliary jib 20 is held at a predetermined angle by an angle fixing pin 16 inserted into the angle fixing hole 14 of the bracket 10 when its base end 24 is inserted from the insertion opening 12 of the bracket 10, and is rotatably supported by being pivoted by a pin member 6. COPYRIGHT: (C)2010,JPO&INPIT
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