Mortise lock repair diagram

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Mortise lock repair diagram

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You may freely link to this site, and use it for non-commercial use subject to our terms of use. View our Privacy Policy here. Toggle navigation Cancel. Log in. Remember Me? Login with Facebook Log in. Forgot Password? New Posts. Today's Posts. Community Member List. Forum Actions Mark Forums Read. Quick Links View Forum Leaders. Thread Tools. I have a duplex with mortise locks on the front doors, Circa Neither one of them works as far as the thumb latch, and the keys are both long gone.

A previous owner has added a modern deadbolt above the original mortise lock to each door so they can be locked, but it looks hokey. My locksmith is not optimistic about being able to fix the original locks, but the exterior trim is very handsome and I'd like to try to keep it if I can.

They look like they were of good quality in their day - there are buttons on the side like the commercial locks have nowadays. What do you guys do with these? Are the new mortise locks the same size as the old ones?The L Series mortise lock offers strength and security for almost any commercial application.

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The Schlage L Series has long been the benchmark for mortise locks. The L Series is more than strength and security — it offers tremendous flexibility to allow it to meet the needs of most every application. Schlage L Series Catalog. Decorative Levers Brochure. Allegion Connect Data Sheet. Classroom Upgrade Kits. Schlage L Series Service Manual. Schlage L Series Templates. L Series Universal Transformation Guide. Select by Brand. Select by Category.

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Doors and Frames. Electric Strikes. Electrified Locks. Electromagnetic Locks. Electronic Locks. Exit Devices. Key Systems. Mechanical Accessories. Mechanical Locks. Power Supplies. Sealing Solutions.Preserving antique doors and their hardware is an important part of restoring an old house to its former glory.

Many old houses used mortise locks set into a pocket cut in the door edge. These locks combine a latch worked by the doorknob and a separate deadbolt worked by a key.

How To Remove a Mortise Cylinder Lock Set From an Entrance Door

In normal use, the locks accumulate dirt and gunk that impair operation. In most instances, an inoperable antique mortise lock can be restored to full function with cleaning and lubrication.

mortise lock repair diagram

Loosen the setscrew securing either one of the doorknobs to the square knob shaft. Pull the knob off the shaft. Grasp the opposite knob and pull the knob shaft out of the lock. Remove the decorative doorknob escutcheon plates from the door by undoing the screws holding them in place.

Examine the mortise lock. Most mortise locks are mounted with screws driven through the face plate into the door edge.

mortise lock repair diagram

If the lock is covered by thick coats of paint, cut around the perimeter of the face plate with a utility knife and dig the paint out of the screw heads with the screwdriver. Undo the mounting screws in the door edge with a screwdriver. Pry gently against the top or bottom edge of the face plate with a screwdriver to pull the lock out of the mortise. Remove the mortise lock from the door. Soften the paint with a blower-type hair dryer or electric heat gun if the face plate of the lock has a thick layer of paint.

Then scrape the paint off with a putty knife. Look on the sides of the lock case for a screw that holds the side cover plate in place. Lay the lock flat with the cover plate retaining screw on top. Undo the screw and remove the cover plate to expose the lock mechanism.

Blow dust and grit out of the lock mechanism with a can of pressurized air -- like those used to blow dirt out of computer keyboards or photographic equipment. Lubricate the lock. Spray the lock mechanism with a silicone or graphite lubricant. Be sure to lubricate any place where metal rubs against metal. Replace the side cover plate and tighten the retaining screw. Check the lock for smooth operation by putting the square knob shaft through the square hole of the lock.

Work the latch. Insert the key in the keyhole and work the deadbolt. Reinsert the lock in the mortise and tighten the face plate retaining screws. Reattach the decorative side plates to the door and tighten the retaining screws. Push the knob shaft through the lock, slide the detached doorknob over the shaft and tighten the setscrew.

Herb Kirchhoff has more than three decades of hands-on experience as an avid garden hobbyist and home handyman.

mortise lock repair diagram

Since retiring from the news business inKirchhoff takes care of a acre rural Michigan lakefront property and applies his experience to his vegetable and flower gardens and home repair and renovation projects.Pin cylinder lock knob sided. Security Pin Cylinder Lock knob sided. Half dimple key euro lock cylinder.

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mortise lock repair diagram

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How to Repair Door Knob Locks & Hardware

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Mortise Locks

Skeleton Keys. You'll find door knob and door lock parts as well as door parts such as striker plates and skeleton keys. Or build a completely custom door set, simply by choosing a doorknob and door knob plate combination.Seattle has some buildings over years old and many of these buildings are secured with mortise locks. These are locks that are modular in that you can install a mortise cylinder in any keyway you want and you can install many different kinds of trim to suit your particular aesthetic needs.

Many of these old locks work beautifully for decades with no attention whatsoever. Sometimes they need a little help. Think about if you want to change the key that works with the lock to a different key in your house or to a high security key.

This is possible with very old locks unless they are so old they use bit keys or skeleton keys as the public calls them. Sometimes people want me to replace mortise locks.

Probably no lock made today will last as long as the mortise lock in their door. If it is malfunctioning, it is only doing so after probably years. There is probably not such a lock on the residential market that is capable of this now. If you have what you think is a mortise lock, chances are that I can probably fix it. I frequently fix mortise lock problems in less than half an hour. Properly lubricated and re-installed, my money is on a mortise lock lasting longer than anything you might buy at home depot.

That said, there is a time and a place for replacing mortise locks. If the parts inside are extremely worn down and the lock is less common then replacement parts are hard to come by. In that situation the options are replace the mortise lock with a different one with the same dimensions or retrofit the door to use a modern knob.

The factors that favor keeping a mortise lock are that the old lock probably has aesthetic value. They also typically have a lot of functionality, being able to switch between entry and storeroom function with the push of a button. Modern mortise locks are usually rated grade 1 locks, and I am sure that old mortise locks still in use probably rate just as highly when one considers how long they have lasted already.

Another benefit of mortise locks is that they are mostly standardized in a few different spindle varieties and one cylinder diameter and thread pitch. This means that you can easily update the cylinder in a lock years old to use the most modern keyways.

I have installed my own CX-5 cylinders in them. The bolt may be stuck in the extended position with no way to retract it in normal usage. It can be a real chore to get the door open in these cases. If you have only one entrance then you may want to replace or modify your mortise lock.

Another reason to replace a mortise lock is because all of the components are worn to the point of being too expensive to replace them. If the lock is a rare one it may be nearly impossible to replace lock components without expensive customised parts.

This is not prohibitively expensive to the richest and most architecturally principled of my clientelle but is to most. Replacing a mortise lock is very expensive.

Less expensive is to retrofit the door with a wrap around plate and either locking or passage tubular lock and a deadbolt. A nice middle ground is to keep the mortise lock and install a deadbolt above it. If the mortise lock is malfunctioning but the knob works well this is a great option.

Many people around the world have found this website and asked if they may mail their mortise locks to me for fixing. The answer is yes.If you have an older house with knobs that slip, latches that are stuck inside the door, or other minor problems, then you should follow these instructions to remove the lock, dis-assemble it, clean and perform minor repairs.

Did you use this instructable in your classroom? Add a Teacher Note to share how you incorporated it into your lesson. This mortise lock set is installed in a colonial in the Boston area. Notice the set screw on the base of the knob on the right.

This screw should hold the knob securely to the spindle when you turn the knob. The spindle is threaded to hold the knobs on, but has flats to operate the lock mechanism and to allow the set screws in the knob to hold the knob securely to the spindle.

If the set screws become lose they will allow the knob to turn without actuating the lock mechanism. If your knob is "slipping" try tightening this screw. Prolonged use with a lose set screw can damage the spindle. If tightening the set screw does not help, you should be able to buy a new spindle at your local hardware store not the chain with the 16 year old clerk, find the one with the proprietor who is approximately as old as your home.

To remove a knob, find the set screw on the base and loosen it just enough that the handle turns freely on the spindle. To remove the spindle, pull on the other knob with the spindle attached. If you need to replace the spindle loosen the set screw on this knob, and unscrew the spindle from the knob to remove it.

Reverse your steps from this point to install the new spindle. Before you remove the lock mechanism from the door, you may want to score the gap around the lock front with a razor to free any paint that may be attached to the metal. If there is paint on the lock face, then when you remove the mechanism the paint may stick to the lock face and peal off the wood of the door.

To extract the lock mechanism from a tight mortise hole, place a small screw driver through the hole where the spindle was and gently push forward to free the lock face from the wood. Beware that several components inside the case may be attached to springs. If you are not careful when you open the case, you will not get a chance to see how the inner workings are supposed to fit together, or worse parts, may fly off into the far corners of your workspace.

Carefully remove the screw while holding the case together. If you need to reverse the latch so that it closes the other way, gently remove the latch while holding the other parts in place, and re-insert it with the angled end facing the other direction.

If that's all you needed to do, reverse your steps from this point to re-install the lock. However, look at all those cobwebs! Lets continue on to clean the lock. Now would be a great time to take a photo of your lock mechanism so you can put it back together later.

The deadbolt mechanism will have a powerful spring. Press the gate toward the top of the lock mechanism, lift it over the top of the cam on the deadboltand gently release the spring tension until you can safely lift the gate off it's pin. The main lock body should be cast and fairly durable. The lock face is likely brass and is therefore easy to dent and even bend. Use a vise to hold the case body so you can clean the face, but do not over-tighten the vise or clamp directly to the brass face, or you will damage your lock.

Use steel wool to polish the lock face. Do not think you are clever and use sand paper to rush the job along. Be patient. Remember you are here because some lazy sod didn't bother ot remove the lock before painting. Look at all the gunk on there! Do not repeat their mistake. You may reveal marks from the craftsman who built your lock.


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