| 摘要 |
A self-propelled toy includes a hollow shell and a motive means which includes a battery-operated motor, enclosed within the shell for causing the shell to roll along a supporting surface. A gravity-operated switch is mounted on the motive means for de-energizing the motor when the toy is not in use. In operation, the motive means is disposed at a lowermost portion of the shell, and the switch is disposed in a position to energize the motive means for causing the shell to revolve about the motive means. When the shell becomes restrained from movement, the motive means moves relative to the shell along the inner surface thereof until the switch reaches a position where it opens the circuit to the motor.
|
