| 摘要 |
To improve the performances such as slip-preventing, road surface-protecting, silencing, and marking during traveling of a wheel apparatus by selecting a variety of tread pieces to easily obtain an optimum ground contact condition. For the purpose, the tread pieces are coupled to a moving body to constitute an independent control unit. The control unit is attached to and detached from the wheel apparatus by using a simple connection mechanism of a fitting type, whereby the apparatus can be prevented from being damaged and its peripheral danger and injury can be prevented from occurring during traveling of the apparatus by use of the tread pieces.
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