Most of the communication doors and entrance doors are composed of a cleat frame, an internal honeycomb structure and two faces of plywood or fibreboard, the assembly being held together by gluing. This is called an "isoplane" door. Their lock is embedded in the outer edge (it is called lock "to lard"). The replacement of this type of lock requires care and method.
- Flat blade screwdriver
- Phillips screwdriver
- Dismantling the faulty lock
- Installation of the new lock
Dismantling the faulty lock
1. The recess bolt justifies the replacement of the lock, this defect is generally not repairable.
2. Undo the top and bottom screws of the handle plate. Avoid the use of an unscrewing machine which, by ripping, may damage the handle plate.
3. Release the plate and handle from the square rod. Collect the other handle plate, being careful not to drop the square.
4. Undo the upper fixing screw and then the lower fixing screw on the edge of the door.
5. Insert the screwdriver shaft into the hole in the square. Pull laterally to dislodge the top of the lock. Do the same at the key hole to disengage the lock from its slot from below.
6. Unlock the lock and pull it straight out of the slot.
Installation of the new lock
7. Engage the new lock in its housing.
8. Make a few hammers on the edge of the lock to fit it.
9. Tighten the upper fixing screw and then the lower fixing screw.
10. Engage the square rod mounted on the plate into the follower (square hole in the lock). Move the two handles closer together.
11. Reassemble the upper screw on the handle plate and the lower screw on the handle plate.
12. Tuck the bolt and lubricate the inside of the lock. Maneuver the handle a few times.
13. Wipe off excess lubricant and test the operation and resistance of the lock.
(photos / visuals: © DIY-Prod, except special mention)
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