Invention Grant
US09140063B2 Switch ladder sensor for roll-up door 有权
用于卷起门的梯形传感器

Switch ladder sensor for roll-up door
Abstract:
A system and method for detecting damage to a door system by detecting the presence or absence of a magnetic source attached to the door system for stopping motion or reversing motion of the door to prevent any further damage to the door system. For example, a roll-up type door may be damaged by a vehicle and pulled from its vertical support guides; detecting this event causes stopping of any motion of the door, such as opening or closing the door.
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