| 摘要 |
PROBLEM TO BE SOLVED: To enable a turnabout at a usual running time and the sideways- turning of a turnabout wheel at a lateral running time though referring to a four-wheel type. SOLUTION: A drive wheel 3 and a turnabout wheel 4 each are provided on a car body 2 in a possible state of making a turn to an angle of 90 deg.. The drive wheel 3 is provided turnably around a vertical axial center 27 and a drive wheel turn means is provided. The turnabout wheel 4 is provided turnably around the vertical axial center 49 and is equipped with a turnabout wheel turn means 50. The means 50 has a turnabout cylinder 51 operable right and left and a cylinder 53 for the lateral running of a turnabout wheel. The cylinder 53 for the lateral running of a turnabout wheel makes a turn of the turnabout wheel 4 to an angle of 90 deg. while moving the cylinder 51 in a neutral state back and forth and also takes a prescribed nonoperational attitude at the working time of the turnabout cylinder 51. |
