| 摘要 |
PURPOSE:To achieve stable state under work while to achieve light travelling by making the inter-shaft distance and inter-wheel distance telescopable. CONSTITUTION:Rear wheels 25, 27 are mounted at the opposite sides of a lateral beam 29 secured to the chassis 5 through a sliding shaft 54 while front wheels 39, 41 are mounted at the opposite ends of lateral beam 31 pivoted rollably to the chassis through a sliding shaft 75. Said shafts are made telescopable axially through a hydraulic cylinder contained in the lateral beams 29, 31 to vary the inter-wheel distance. The lateral beams 29, 31 are coupled through a hydraulic cylinder 89 to vary the inter-shaft distance. Since the inter-shaft distance and inter-wheel distance can be varied, stable state can be maintained. |
