| 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 the slat becomes tilted, due for example to one end of the slat becoming snagged in the guideway at the side of the door, the sensor detects the tilt, and arrests the downwards movement of the door, before the slats can spill out and escape from the guideway.
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