| 摘要 |
<P>PROBLEM TO BE SOLVED: To make the operations of attachment/detachment and transportation of an attachment safe and simple by holding the attachment in a stable stationary attitude and preventing pressure from being retained in a cylinder for bending and stretching a component boom. Ž<P>SOLUTION: A main front boom 8 (first boom), an intermediate boom 9 (second boom), and an arm 13 (third boom) maintain the stationary attitude in which a leading end of the arm 13 is placed in the furthest stretched or furthest contracted state of a boom cylinder 11 (first cylinder) and the furthest contracted state of an arm cylinder 12 (second cylinder); and a boom supporting pin 40 provided on the main front boom 8 or the intermediate boom 9 is supported by a boom supporting base 50. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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