Efficient and safe door locking control in power-off and power-on conditions
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United States of America Patent
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Oct 8, 2013
Grant Date -
Dec 1, 2011
app pub date -
May 28, 2010
filing date -
May 28, 2010
priority date (Note) -
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Abstract
Systems, methods, and devices that efficiently control the operating state of an electromagnetic lock under power on and power off conditions are presented. A lock component includes a solenoid component (e.g., bi-stable latching solenoid) that holds a lock pin in a locked or unlocked position without using power to hold the lock pin in the desired position, and using power to transition from one position to another position. A sensor component senses when power to the lock component will be lost, and if the lock pin is not in the desired position for the power off condition, the lock pin can be transitioned to the desired position, and if the lock pin is in the desired position for power off condition, the lock component can maintain the lock pin in the desired position, while the lock component is in the power off condition.
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