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Rev. A.1, 8/01 | Page- 5 |
If the amount of slack or rattling is less than
Figure 4 illustrates the points made in this Section.
FIG. 4: FINAL ADJUSTMENT OF DOOR CLOSING TOLERANCE
VIEW OF MORTISE UNLATCH LOOKING STRAIGHT INTO DOOR FRAME
DEADLATCH
FINGERS
SPRINGLATCH PLUNGER | TWO SPACERS | |
SILENCER | ||
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3. OPERATION
While you can make a successful installation without knowing how the Mortise UnLatch functions, it’s best if you understand its operation in the event you run into difficulties or questions. The operation of the Mortise UnLatch is, of course, intimately connected with the way mortise locks work on a door so we’ll cover this first.
Mortise locks are the highest quality and heaviest duty locks for sale in North America. They not only provide long operating life but deliver the highest level of physical security obtainable in a mechanical latch. To assure this security, all mortise locks include deadlatching function. This means that when the door is closed and latched, a deadlatch pin, present on the lock face, is pressed in. This mechanically pins the springlatch so that it cannot be moved by an object (such as a credit card) which is pushed in between the door and frame.
In order to release the mortise latch, the Mortise UnLatch has two moving elements under the control of a motor. We call these the springlatch plunger and deadlatch fingers. When the door is in the closed and secure position, the springlatch pushes in the springlatch plunger and the deadlatch pin rests on the deadlatch fingers which push in the deadlatch pin. This maintains the latch in the secure position and makes full use of the deadlatching function.
When the Mortise UnLatch operates (the trigger wire connects to the +V wire), the deadlatch fingers retract into the body of the Mortise UnLatch which allows the deadlatch pin to move out. Then the springlatch plunger and deadlatch fingers simultaneously push the latch and deadlatch pin back into the lock body and the door may be opened from the outside. This operation takes about 1/3 of a second. When the trigger wire is removed from the +V wire, the Mortise UnLatch will return to its initial condition: the springlatch plunger will retract into the Mortise UnLatch body which allows the latch to resecure the door and the deadlatch fingers will push out depressing the deadlatch pin and freezing the latch for best security.