| 摘要 |
A control switch for controlling the coiling and uncoiling of an electric winch cable has a push button installed on a top cover of the switch. Both sides of the push button have a retaining pin, and its bottom is an appropriate V-shaped surface. Both edges of the V-shaped surface have a conducting plate. The conducting plates to a dc voltage source on the bottom cover of the switch are arranged to cross each other, with a lateral contacting plate in between. The top of the contacting plate has a supporting post at each end, and the bottom has two retaining posts such that the push button is snug with the retaining pins and the supporting post of the contacting plate. The conducting plates for motor wiring are arranged in parallel on both sides of the conducting plates for the dc voltage source. With such a configuration, pressing the push button to the left or the right changes the polarity of the dc voltage source so as to control the winch cable to coil or uncoil. When it stops, the motor wiring comes in contact with the conducting plates so that the twisting force of the motor shaft is increased. Therefore, when the switch is off, the motor shaft retards the rotation of the motor.
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