| 摘要 |
PROBLEM TO BE SOLVED: To provide a mechanism of simple structure for automatically lowering rear wheels to correct forward/backward tilting attitude of a machine body, while restricting increase of the weight and costs of the machine body. SOLUTION: A first support member and a second support member 51 are arranged right and left to support a revolving fulcrum shaft 54 in the right and left direction, and the second support member 51 is detachably constituted from a machine body frame 49, and a rear wheel transmission case 34 is rotatably installed freely around the revolving fulcrum shaft 54 in the vertical direction between the first support member and the second support member 51. The rear wheel transmission shaft 33 is provided with a bending joint 33a so that the joint 33a is bent to be recessed upward when the rear wheel axle 56 is positioned at the top position, so that the point 33a is recessed downward when the rear wheel axle 56 is positioned at the lowest position, and so that an angle of bend of the joint 33a when the rear wheel axle 56 is positioned at the top position is smaller than the angle of bend of the joint 33a when the rear wheel axle 56 is positioned at the lowest position. COPYRIGHT: (C)2008,JPO&INPIT
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