| 摘要 |
A wheel locking or parking brake for a vehicle including a plate member affixed to a wheel or axle having a plurality of closely spaced holes in a circular configuration or a circumferential flange with a peripheral extension or lug; electrically powered pin advancing and retracting means; the pin adapted to engage and pass into any of the holes or advance in the path of the extension or lug; electric power supply and electric current polarity reversing means, wherein in operation, the pin remains in either an advanced or retracted position depending on the direction of the current when the electric power was switched off. |
