| 摘要 |
PROBLEM TO BE SOLVED: To easily and safely enforce a removing work of an auxiliary crane device and to easily transport and store the auxiliary crane device in the removed state. SOLUTION: An auxiliary jib 34 to be a substrate of an auxiliary crane device 13 is constituted of left and right brackets 16 supporting both end parts of a sheave rod 15, left and right bracket arms 17 provided fixedly to these brackets 16 and left and right stays 19 connected with the lower parts of the brackets 16. Because a link 40 is interposed between the bracket arm 17 and the stay 19, one end part of this link 40 is pivotally fixed so that the one end part may be brought down on the bracket arm 17 and the other end part of the link 40 is connected with a lug which is projectingly provided on the stay 19 by a pin, a pitch between a boom mounting hole 17b of the other end part of the bracket arm 17 and a boom mounting hole 19b of the other end part of the stay 19 is set to the same dimension as a pitch between holes 3a, 3b at a tip of a boom 3. When the auxiliary crane device 31 is transported and stored, the pin at the other end part of the link 40 is pulled out, the link 40 is brought down and the auxiliary jib 34 is folded.
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