| 摘要 |
A double-bar riding wheel positioned between two circular cross-section bars acting as support. One end of each bar is partly restrained but permits a limited amount of rotational movement of the bar. The other end of each bar is held by an operator's hand by means of a handle, thus providing the wheel actuating motion by lifting the handles. The bar cross-sections generally increase from one end to the other. The riding wheel is equipped with two shafts, one attached to each one of the two sides of the wheel. The combination of the variations of the bar shapes lengthwise and of the shaft shapes lengthwise makes it difficult for the wheel to remain astride of the two bars while being urged to ride forward by the operator. The shapes of both shafts and bars are such that the degree of difficulty increases from one end of the bars to the other. The object of the operation, is to make the wheel ride the full length of the bars, or at least to proceed as far as possible from the starting point. The movements of the handles are automatically limited so that only one shaft may fall off its rolling position on top of a bar, thus stopping the wheel riding. The wheel is prevented from ever falling between the two bars. Indicia on the bars are used to record the location where the wheel then stops. Various coordinated motions of both hands are needed to control and steer a successful wheel ride, which requires manual skill and dexterity from the operator.
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