| 摘要 |
A public works machine comprises a frame on which a telescopic jib is pivotally mounted, means for controlling pivotal movement of the jib connected between the frame and a first section of the jib which is pivotally mounted on the frame, means for controlling sliding movement of the section of the jib connected between the first and a second section slidable relative to the first section, wherein a member is pivotally mounted on the first section for pivotal movement about an axis parallel to that of the mounting of the jib on the frame, and a working tool is freely supported from the member, pivotal movement of the member being controlled by the sliding control means and an arm pivotally connected between the member and the second section of the jib.
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