| 摘要 |
A self-propelling rolling toy includes a transparent spherical outer casing, a coupling rod provided in and coupled non-rotatably to the outer casing, a horizontal transmission shaft mounted rotatably in the outer casing, an inner body mounted rotatably on the shaft inside the outer casing, a clutch operable to lock selectively the inner body to the outer casing, and a winding-type driving unit disposed in the inner body. The driving unit includes a spiral energy spring with an innermost end coupled to the shaft and an outermost end coupled to the inner body, a ratchet and pawl unit provided on the shaft, and a gear set which couples the ratchet and pawl unit and the coupling rod. The ratchet and pawl unit prevents rotation of the shaft from being transmitted to the coupling rod when the shaft is rotated in a first direction while the inner body is locked to the outer casing to permit winding of the spring, and permits rotation of the shaft in an opposite second direction due to operating energy stored in the spring to be transferred to the outer casing while the inner body is unlocked from the outer casing.
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