| 摘要 |
PROBLEM TO BE SOLVED: To make a machine body easily changeable its direction on the farm field by one operator. SOLUTION: The revolving stand 13 is set on a machine body 4 freely runnable in the front and rear directions i.e. in the longitudinal direction of a ridge with left and right front wheels 2 and left and right rear wheels 3 which are set to span over the ridge U, and which stand is made switchable between a supporting state Sa supporting the machine body 4 by touching on the ground and a retreating state Sb unsupporting the machine body 4 by separating from the ground, and is formed to be supported to the ground so that, in the supporting state Sa, the machine body 4 is rotatable in a state floating the rear wheels 3 from the ground. And, an earth ring 20 rotatably grounding on the ground in the supporting state Sa and a support 22 supporting the machine body 4 to the grounding ring 20 grounded on the ground are provided. COPYRIGHT: (C)2006,JPO&NCIPI
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