| 摘要 |
PURPOSE:To raise workability of an excavating working vehicle in narrow sites by a method in which an oil-pressure cylinder for arm is attached to a link part attached to a swing bracket with arm in a vertically rocking manner, and an oil-pressure cylinder for link part is attached to the bracket. CONSTITUTION:A slewing base 7 is rotatably (around vertical axis core P) attached to a crawler type traveling device 7. A swing bracket 2 fitted with an arm 1 for excavation is attached to the slewing base 7 in a manner that the bracket 2 is bilaterally moved around the vertical axis core P in a rocking manner and is freely fixed. A link part 13 is attached to the bracket 2 in a vertically rocking manner, and an oil-pressure cylinder C1 to vertically move the arm 1 in a rocking manner is attached to the link member 13. An oil- pressure cylinder C4 to vertically move the link member 13 in a rocking manner is attached to the bracket 2. The link member 13 is moved in a rocking manner thereby, the arm 1 is moved backwards in a rocking manner, and the slewing radius (a) of the arm 1 is contracted to radius (b). The arm 1 can thus be turned without contact with the wall face. |
