| 摘要 |
PURPOSE:To enable using both track type and trackless type methods by providing a pair of wheels and rims having a smaller outside diameter than that of said wheels and selectively bringing said wheels and rims into contact with a trackless floor surface and with a track on a floor surface. CONSTITUTION:A wheel 3 which travels on a trackless floor surface 2, is installed under a vehicle body 1. And, a track 5 having a certain height which permits a gap 6 to be left between the wheel 3 and the floor surface 2, is installed under the rim 4. On the other hand,a slope part 7 which have a form of gradually becoming a defined height of the track 5, is provided on the end part at which the vehicle body 1 gets on and off the track 5. Thereby, when the vehicle body 1 travels on the trackless floor surface 2, only the wheel 3 is brought into contact with the floor surface 2 while, when traveling on the track 5, only the rim 4 is brought into contact with the track 5. Accordingly, both methods of track type and trackless type can be combinedly used as required to convey the vehicle body 1.
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