| 摘要 |
A toy stunt race car is described. The device includes a fifth wheel having an axis of rotation lower than the axis of rotation for the conventional four wheels of the car. The fifth wheel is driven by a motor and its mount also is caused to rotate. The fifth wheel then makes a three point contact with the surface including only two of the car wheels. As the fifth wheel mount continues to rotate, different two wheels are involved so that the car either races forward, backward, or turns sharply to the left or to the right, depending upon where the driven fifth wheel is relative to the car during rotation of the mount therefore.
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