| 摘要 |
PROBLEM TO BE SOLVED: To provide a demolition machine which improves safety by preventing the occurrence of retraction due to the leakage of oil from a hydraulic circuit of a hydraulic cylinder of an extendable boom. SOLUTION: A cab 4 and an articulated boom 5 for work are installed on a turning body 3 arranged on a runner 1, and an attachment 6 for demolition is installed on the tip of the boom 5 for work. The boom head 5b of the boom 5 for work, in which a hydraulic cylinder for extension and contraction is embedded, is extendable. The boom head 5b is provided with a lock pin device which prevents the extension or retraction in a retracted state or extended state, respectively. COPYRIGHT: (C)2004,JPO&NCIPI
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