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My back door (which is only two years old) has a door knob that recently suddenly stopped turning. I can lock and unlock it, but it just won't turn. Here's a picture of the inside of the door knob:

inside view of back, exterior door knob

The very center bit is the lock mechanism, and I can turn it (locking and unlocking it) easily with a hex key. The half-circle immediately next to it appears to me to be the mechanism for opening the door — I could be wrong about that, though. It will not budge. The only two options I can see now are:

  1. taking the door off its hinges so that I can completely remove the lock set and possibly replace it with a new one; or

  2. calling a lock smith.

I'm more inclined to go with the latter than the former. Any other suggestions?

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In its currently disassembled state, there is nothing locking the mechanism. You are correct that the C shaped half-circle shaft is what pulls the latch back when turned.

If you cannot push the latch back with your finger, the anti-jimmy device has had a piece break in it.

I had this happen on a bathroom door latch about two weeks ago, probably made by the same manufacturer as the shape of the lock actuator rod and latch actuator are exactly the same.

If you look at it, the lock actuator rod (the center piece you were turning) has a taper section just where it passes through the latch pull which means that during assembly, you manually push the latch back and it passes straight through.

In order to get clearance so the lock actuator rod will pass through, I pried the folded piece that they pass through till I got clearance so the shafts would pull out. I then squeezed the folded piece back together and pushed the latch out. It didn't even require taking the door off the hinges.

Replace the whole door knob/latch assembly with new and you're back in action.

Latch Mechanism

  • Thanks. After getting a friend over who was far more knowledgable than I am, we did just this. We did take the door off its hinges and were still not able to push the latch closed. Eventually, he worked a tool into the area you indicated and we finally got it disassembled. For those in the market for locks and wanting to know what not to buy, we had a Callan2 lock. Our new lock is a Schlage, which Lowe's was nice enough to match to our existing key. – Ben Hocking Mar 2 '13 at 21:03
  • Fiasco Labs (above) is the correct answer. However, I had to use metal cutters to cut away the 2 outer pieces/plates of the inside latch assembly, on both sides (!), before I could get the whole "outside" knob with the (2) left and right screw casings and the center shaft and Half Section "C" section to pop out completely. Then it was a matter of fiddling, wiggling and prying to get the actual bolt latch that "locks" into the door jamb to release. It takes patience, cutting and a little bit of determined force, but ultimately you will get it. I guess when you cut a mechanism apart completely, – user44004 Sep 28 '15 at 4:32
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I would remove both the inside and outside doorknobs. Use a screwdriver to turn the bolt mechanism (the part that actually locks the door. Try to insert a small screwdriver between the door and the jamb and push the bolt back while turning the mechanism in the door. It may help to push or pull on the door on the door at the same time. If none of this helps try to tap the pins out of the hinges. Use a screwdriver and a hammer. Beaware that some hinges use setscrews to hold the pins in place and the door has to be open to gain access to the setscrews.

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I had a similar problem recently and after reading this question and its answers, I realized I could buy just the latch assembly. So the key is to get the door open so that I could replace it. Rather than attacking the actuator rod, I decided to cut the latch with a hacksaw blade. To make the job quicker, I pulled back the latch as far as I could with wrench and then started cutting the latch with the hacksaw blade:

Cut the latch instead

Initially, I used a piece of cardboard to make a handle, but I went to the store to buy a small hacksaw handle with a good portion of the blade exposed for just this sort of job:

Hacksaw handle

Once I cut through the latch, the door could be opened and the latch replaced. However, I did notice that the door hinges needed tightening so that it swings closed all the way. I also adjusted the strike plate, which wasn't properly holding back the deadlatch. I believe if I'd failed to do those things, the new latch would have had the same problem as the old one. Be sure to test the new lock carefully to make sure it's secure.

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