| 摘要 |
A toy piano has a set of sound-producing elements disposed within a frame, and a set of key-shaped levers pivotably supported on the frame along a normally horizontal axis for movement from a first position to a second position, respectively. A set of hammers is pivotably disposed within the frame for striking the sound-producing elements; the hammer-contacting ends of the levers normally rest on the hammers, respectively, for preventing the release thereof. The sound-producing means are actuated either manually by depressing one of the levers and releasing it thereafter so that a corresponding hammer is then made to impinge on one of the sound-producing elements, or automatically when a cam-shaft is permitted to periodically strike at least one of the released hammers.
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