I'd like to lock an inside building door, which I'm pretty sure is possible.
The lock/doorknobs look like the pictures. The doorknobs can turn both clockwise and counterclockwise.
How do I lock the door without the key?
Thank You!
Doors – How to Lock an Inside Door with Round Doorknobs Turning Both Clockwise and Counterclockwise Without a Key
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Related Solutions
You need to remove the key set section as pictured on the left. It may be very corroded and require a bit of persuasion to split the halves and remove from the deadbolt assembly. Once you have removed the keyway from both sides, there should be nothing but a couple of screws on the striker/jam plate holding the bolt assembly.
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.
Best Answer
Does that mean the knob in the photo is not the actual door knob you have ?
I am not sure about you door knob but on some older door knobs you push and turn to lock. It may be that it is only lockable with a key.
Grasp the door knob that does not have the key slot in it, push the knob in and then while holding it in turn it, probably clockwise, just little and it should stay in when you release it and that should lock it.
You can do this with door open so you can test the other side to be sure it is locked.