| 摘要 |
Portable collapsible spokeless wheels are formed with a rotating circular wheel rim element defining a full circle and without a central axle, hub, or spokes. The wheel rim element is formed around its outer periphery with a land portion or tread portion for bearing against the ground. The wheel rim element fits within a fender rim element which defines only a portion of a circle but greater than a half circle. At least three sets of rollers or casters are distributed around the inner surface of the fender rim element for bearing against and within a groove formed around the wheel rim. The rollers or casters are complementary with the groove portion of wheel rim element and are spaced apart to define an arc greater than a half circle. The fender rim element is further provided with braces which tie the ends of the fender rim element together and constrain the wheel rim element into a circular arch for bearing the weight of a load in compression rather than in suspension or tension. The portable collapsible wheel is used in recreational and utilitarian applications such as carts, carriers, and wheelbarrows.
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