| 摘要 |
55,729 Apparatus for visually indicating a worn brush condition for carbon brushes arranged in a gang-type brush holder. A strip of red Teflon tape, or other distinctive marking, is positioned on the coil spring which biases the brush into contact with the collector ring. As the brush wears down, the marking on the spring becomes visible as the spring coils more and more. The tape is positioned on the spring such that, when the exposed portion of the coil spring shows completely red (i.e., the color of the marking), it is indicated to the operator that a worn brush is to be replaced.
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