| 摘要 |
PURPOSE:To facilitate mounting and demounting by installing an auxiliary tire having a divided tire installed onto the free edge of an expandable driving part which radially extends outside a wheel and allowing the expandable driving part to be operated from car interior. CONSTITUTION:An annular wheel 14 having a section in U-form is fixed onto the edge of a shaft outside a driving tire. Then, a divided tire 16 is formed outside the tire through an expandable driving part 15 radially installed in projection form. With such constitution, the expandable driving part 15 can be extended and contracted by diving the motor which is built is the expandable driving part 15 and not shown in the figure, by the operation executed from a driver's seat in case of necessity. Therefore, the divided tire 16 advances and retreats and projects and retracts for the peripheral surface of the diriving-wheel tire. Therefore, slip preventing function can be developed and released. Further, mounting and demounting can be simplified. |
