| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent a twist, a drive loss and the like even when a guiding body is curved by arranging a driving wheel and guided parts so that an axle center of the driving wheel is positioned on a vehicle body lateral directional imaginary line passing through the center in the vehicle body longitudinal direction between the guided parts. SOLUTION: An imaginary line KL, which passes through the center in the body longitudinal direction between a pair of guided parts 30, 30, is imagined in the body lateral direction. When a vehicle body 11 is turned around the turning center along a curved part, on which an axle center of a driving wheel 12 is positioned on the imaginary line KL and the driving wheel 12 is positioned on the turning inside, in a guide rail, the driving wheel 12 is positioned between the turning center and the guide rail. In this way, the vehicle body 11 can be advanced by means of the driving wheel 12 even when the guide rail is curved.</p> |
