| 摘要 |
Heat warning device for warning that a surface is hot. Fiber optic cable having a plurality of fibers surrounded by a protective sheathing runs from an electric light source controlled by a controller. The plurality of fibers at first end of the cable adjacent the light source transmit light to illuminate a predetermined warning symbol adjacent the side of the cable, on the protective sheathing of the cable as a cut-out, at a long spaced interval from the second end of the cable or anywhere else. The illuminated heat warning symbol is visible to an observer who sees that the surface is dangerously hot. Whenever a specified surface temperature is reached, the symbol is lit and remains lit. Alternatively, the cable transmits to a receiving medium spaced from a second end of the cable an image of the symbol positioned between the light source and the first end of the cable.
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