| 摘要 |
A merry-go-round or playground turntable comprises a rotatable platform, a fixed shaft segment coaxially supporting the platform, a rotatable shaft segment, a ratchet drive coaxially coupling the rotatable shaft segment to the fixed shaft segment, and a hand wheel mounted to the rotatable shaft segment. The turntable is operable to rotate in only one direction is response to torque applied to the hand wheel by at least one operator, typically a young or handicapped child, supported on the platform. The ratchet drive permits the operator to turn the platform while continuously grasping the hand wheel.
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