| 摘要 |
The device is based on a tilt-sensing switch of the mercury-bridges-gap type . The device measures the tilt angle of the bottom slat of a roll-down door. If th e slat becomes tilted, due for example to one end of the slat becoming snagged in t he guideway at the side of the door, the sensor detects the tilt, and arrests t he downwards movement of the door, before the slats can spill out and escape fr om the guideway.
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