| 摘要 |
<p>A sound-producing steel toy disk includes a round steel sheet (10), which is internally punched at a position close to a middle point of a radius thereof to form a circle of downward curved recess (12) surrounding a flat central surface (15) of the toy disk. When a downward force is applied to the flat central surface, a radially inner slope of the curved recess quickly shifts to produce a clear and crisp sound. <IMAGE></p> |
