In this article, a tough new Marks USA Protector Series LA118J Classroom Maximum Security Mortise Lock is installed onto a pre-prepped wood mount. For added strength, the sample LA118J is equipped with exterior and interior lever override guard. To put it simply, door locks take a beating...
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The dimensions of the Marks USA"J" function mortise lock body are six inches long (eight inches at the front), four inches deep, and one inch thick.
The Marks USA Protector Series Mortise Locks are handed. However, the handing is field-reversible. To change the handing of the Classroom function lock, the latch and auxiliary latch must be reversed, and the hubs must be reversed.
The hubs must be reversed as the exterior side of the lock is reversed when the handing is changed. This makes the outside, the inside, and vise versa.
Step 1. Remove the five Phillips head screws securing the cover onto the mortise body.
Step 2. Disengage the hubs from the lever support springs. There is one lever support spring for each hub.
Step 3. Lift the hubs out of the lock body.
Step 4. Insert the hubs in reverse order, engaging one lever support spring per hub.
Step 5. Carefully lift the lever stop and the locking piece assembly out of the lock body. These two parts must be removed in order to reverse the latches.
Step 6. Carefully lift the latch out of the lock body.
Step 7. Slide the auxiliary latch into the lock body, and slide it off the armature.
Step 8. Reverse its position and reinstall.
Step 9. Slide the latch washer towards the latch and insert into the lock body.
Step 10. Release the washer to spring load the latch.
Step 11. Install the locking piece assembly. Be sure to attach the spring.
Step 12. Install the lever stop. Test the lever stop to be certain it locks and unlocks the outside hub.
Step 13. Slide the cover onto the lock body.
Step 14. Install the five Phillips head screws. Test the operation of the mortise lock. If the lock does not operate smoothly, loosen the screws and make sure the parts that slide into the slots in the cover and body are in their proper positions.
To install the Marks USA Protector Series LA118J Mortise Lock:
Step 1. Slide the mortise lock body into the mount edge with the opening for the lock cylinder at the top.
Step 2. Loosely attach the mortise lock body into the mount using the two one-inch-long Phillips head wood screws.
Step 3. Place the exterior lever override guard with integral spring-loaded spindle into the exterior trim lever opening. The override guard is installed with the lever perpendicular to the trim.
Step 4. Slide the trim onto the mount with the spindle sliding into the mortise lock hub.
Step 5. With the key out of the keyway, thread the mortise cylinder into the lock body.
Step 6. Place the interior lever override guard with integral spring-loaded spindle into the interior trim lever opening. The override guard is installed with the lever perpendicular to the trim.
Step 7. Slide the trim onto the mount with the spindle sliding into the mortise lock hub.
Step 8. While maintaining the exterior and interior trim in position, start each of the four tamper-resistant screws. Test the operation of the levers and the mortise cylinder.
Step 9. Tighten the two Phillips head wood screws securing the lock body to the mount.
Step 10. Tighten the four tamper-resistant screws with a number ten tool.
Step 11. Tighten the mortise cylinder. Test the operation of the levers and the mortise cylinder.
Step 12. Install the lock front using the two supplied tamper-resistant screws. Use a number six tool to tighten these screws. Test the operation of the levers and the mortise cylinder.
The Protector Series Mortise Locks are designed to accommodate 1-5/8" to 2-1/4" thick doors. They are designed to accept a 1-1/8" mortise lock cylinder. The Protector Series Mortise Locks are available in 35 functions from dummy to intruder deadbolt to entrance. Marks USA Protector Series mortise locks have a lifetime mechanical warranty.
Teachers can lock or unlock their classroom doors from the inside for added safety in an emergency.
This modification provided the capability of a deadbolt and dead latch in one lock (mortise) mechanism while maintaining the integrity of the door.