| 摘要 |
A mechanism which can be mounted in a door frame is disclosed. The mechanism has a main mounting bracket which is mountable to a door frame, a tension plate which is pivotally mounted to the main mounting bracket a tongue strike mounted on the tension plate for engaging a door bolt and a pressure sensor mounted on the tension plate to sense relative movement between the tension plate and the main mounting bracket caused by the door bolt being urged against the tongue strike. The pressure sensor feeds electronics which operate to control release of the tongue strike.
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