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How it works
A Mortise lock includes a latch and dead latch pin. When the lock is in the closed position, the latch is extended (securing the door) and the dead latch pin is pushed in. This internally pins the latch so that the door can’t be opened by sliding a plastic card in against the latch. The device operates the latch and dead latch pin as follows: In the secure condition, the latch is captured in a cavity against the latch plunger while the dead latch pin is pushed in by a flush finger plate. The lock is released in two quick steps. First the finger plate draws back which releases the dead latch pin and then the latch plunger and finger plate move forward together which releases the door. When the door is re-closed, the device automatically re-secures it including re-establishing full dead latch security.
 
Adjustment to any mortise lock
The chief problem with procuring electric strikes to work with North American Mortise Locks is that there is no standard or commonality among the lock manufacturers as to the vertical position of the latch and dead latch pin in the standard ANSI 4 7/8 door preparation. This means that the electric strike must be specified and purchased individually to suit the particular Lock model on the door. The device is set by the installer in the field, just prior to installation, to correspond to the Lock model. The latch cavity can be moved anywhere on the mortise face with the finger plate occupying the space above and below the latch cavity. The instructions show the correct setting for all North American mortise lock models and adjustment is done quickly with a screw driver and allen wrench.

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