| 摘要 |
PROBLEM TO BE SOLVED: To select either a normal operation device or a preliminary operation device depending on working details, taste, etc., when work is performed by using another working implement as an alternative to a bucket. SOLUTION: In this construction machinery, a pilot circuit switching valve 17, which performs mutual switching between pilot lines 16D and 16E between operating levers 13 and 14 and a spare pedal 15, and a bucket control valve 12D and a fork control valve 12E, is provided between the operating levers 13 and 14 and the control valve 12D, and between the spare pedal 15 and the control valve 12E. Thus, when, for example, a material is transported by using a working device 6 based on grapple specifications, the right operating lever 14 enables a fork 6D1 of a hydraulic grapple 6D to be finely operated for opening/closing by switching the switching valve 17 from a switching position (a) to a switching position (b). Additionally, an operator, which is used to operating a mechanical grapple, can also simply operate the hydraulic grapple 6D. COPYRIGHT: (C)2005,JPO&NCIPI
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