| 摘要 |
A swing comprises an overhead support, an elongated rigid platform having a longitudinal axis, a pair of mirror-image hangers, first and second spaced-apart pivots pivotally connecting the lower ends of the hangers to opposite ends of the platform substantially on the platform axis, and third and fourth spaced-apart pivots pivotally connecting the upper ends of the hangers to the overhead support, the pivot axis of all of the pivots being parallel to each other and perpendicular to the platform axis and the spacing of the third and fourth pivots being less than that of the first and second pivots.
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