| 摘要 |
PURPOSE:To support impaction to be encountered during the turning period by buckling loads by a method in which a slewing base is rotatably attached to the upside of a running device, an excavator is attached to the front of the slewing base in a horizontally rocking manner, and the excavator and the slewing base are connected with an oil-pressure cylinder and a detachable fixing frame. CONSTITUTION:The frame 1 of a slewing base is rotatably attached to the upside of a rubber 2, an excavator 4 is attached to the front central bracket 3 of the frame 1 in a horizontally rocking manner, and an expander 10, e.g., oil-pressure cylinder, etc., and a pin-detchable fixing frame 13 are provided in a plane- view V-shaped form between the excavator 4 and the frame 1. The fixing frame 1 is used when the excavator 4 is fixed to the frontal position. Impaction to be encountered when turning the slewing base 1 in a wide place can thus be supported by the oil-pressure cylinder 10 and the fixing frame 13, and also in narrow place, the fixing frame 13 is removed and slewing is made by the oil-pressure cylinder 10. |
