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Jammed Mortice Lock


 
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chilluk

from United Kingdom

Joined: 10 Sep 2004
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Location: United Kingdom
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PostPosted: Wed Dec 06, 2006 8:12 am Reply with quote

My back door is locked shut and I can't turn the key - it feels like the lock mechanism is jammed tight - I can get the key in and turn in the direction that would lock it, but won't move a millimetre un the direction to unlock.

It's a mortice lock (with a chubb type key?) and the door is timer clad in aluminium.

Any ideas how to get it open so I can replace the mechanism?

Cheers.

Chris.
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Diyisfun

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PostPosted: Wed Dec 06, 2006 8:56 am Reply with quote

Have you tried spraying WD40 into the lock. Got to be the easy starting place.
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JohnD

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PostPosted: Wed Dec 06, 2006 9:48 am Reply with quote

Good idea about trying to lube it.

Make absolutely sure that you are using the correct key.

Otherwise I think the lock is damaged. Make sure no vandal has poked anything through the keyhole.

If you are on the inside of the house, you will be able to cut the bolt of the lock without damaging the door or the frame much, as long as you can see the bolt in the gap.

You will have to use a padsaw or an angle grinder.

Once the door is open you can remove the lock fairly easily and throw it away with many curses.

I have only experienced this on cheap or very old locks, where the internal steel parts have rusted and broken.

I only use genuine Chubb 5-lever or detainer locks as the internal parts are in solid brass or substantial steel.
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chilluk

from United Kingdom

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PostPosted: Wed Dec 06, 2006 5:21 pm Reply with quote

Cheers for the replies. I will try and lube it although it feels more mechanically stuck that friction(ally) stuck.

It's a very thin gap between door and frame so not sure if can cut with anyything much!!

Cheers
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big-all

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PostPosted: Wed Dec 06, 2006 6:27 pm Reply with quote

another thing to try because the damp weather may have swolen the wood iiisss
lean hard on the door in the lock area to try and ease the sideways preasure

if its not tight try rattllng the door whilst turning the key to see if it helps
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HandyHands

from United Kingdom

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PostPosted: Thu Dec 07, 2006 12:02 pm Reply with quote

As Big-all suggests - check if the frame/door has swelled with the recent damp weather. It could be putting pressure on the bolt.

You don't state the lock make, or number of levers, but I'll assume it's a 5 lever BS rated model. likely problems are :

1. The lever pack has become gummed together, with the individual levers not returning to the correct position above the curtain. Try to "jiggle" the key as you turn it, as this may release the levers.

2. When you last locked/unlocked the door, the bolt didn't fully engage/return, and the lever pack is stuck in the unlock position with the bolt stump between the lever gates. Only way to resolve this is with a bent wire to manually move the bolt into it's correct position. If the lock is mounted on the Left (as you look at it), the bolt will be at the back of the lock. If its mounted on the right, then it will be at the front of the lock.

Going by your description, no.2 is the most likely.

Best option, with least amount of damage, would be to call a locksmith out.
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joe-90

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PostPosted: Thu Dec 07, 2006 12:19 pm Reply with quote

When frames are fitted they frequently have gaps at the sides. If you put a car jack across the frame and crank it you may get enough clearance to open the door, then you can replace the lock.

Even if you can't quite do that you may get better acces to the bolt to force it back with a sharp implement.
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