| 摘要 |
A tamper-proof back-up, electrical warning system particularly for use on heavy vehicles such as tractors, road scrapers, motor graders, material handling equipment, and the like, to provide an audible signal to warn persons standing to the rear of such vehicle of backward movement of the vehicle. The electrical warning system has two flasher units and two signal circuits rendered selectively operable by a manual selector switch and arranged so that if one of the flasher units and audible signal circuits should fail, the other can be used. The signal circuits are selectively connected in series with the ignition switch and with a magnetically operated switch that is automatically closed by manual movement of the vehicle shift lever into a reverse position. In addition, a manual by-pass switch is connected in the circuit so that if the magnetic switch operated by the shift lever becomes inoperable, the warning system can be independently activated manually at the time the operator shifts the lever into reverse.
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