| 摘要 |
A control mechanism is disclosed embodying a pivot shaft which controls the supply of power to an electric motor, such as utilized for rotating revolving searchlights. A universal pivotal mounting arrangement is provided for the pivot shaft which does not require a conventional ball and socket joint. When the shaft is pivoted in one direction, it shifts a free-floating printed circuit board to energize the motor. When the shaft is pivoted in the opposite direction, the printed circuit board effects reversal of the polarity of the input power to the motor. In the preferred embodiment, the pivot shaft is pivotal about perpendicularly extending axes to control two electric motors simultaneously whereby a searchlight may be rotated both vertically and horizontally at the same time. |
