I've found it with everybody's lock. To lock the door (or is it unlock, I can never remember which ), the handle has to be lifted first, as the key doesn't have enough torque to move all 7 latches.
 That's the problem, if you forget which, you break the key or mechanism.
Both links are the same.
However, it's a sensible one, a single bolt into the frame. It's the ones with 7 all around the door which require a lot of force to lock and unlock, which you cannot provide with the key, so you have to remember how to operate the handle to assist it. And if anyone else tries to use your door, they end up breaking it.
You get that too? I've noticed lately (newer Windows?) that copy sometimes just doesn't. When I looked it up, it happens to many people. Sometimes the computer just doesn't bother. It can be quite embarrassing when you paste something into a live conversation in a chatroom which was not what you meant to, but a previous copy!
It's common in the UK, and I assumed everywhere. In fact my link is to an American company.
This is a 3 point. I can't find a picture of a 7 point, although most are now 7 point here.
It never occurred to me that the key *might* move the latches, to even think
of trying it. I thought latches were *only* moved in and out by the handle,
and the key released a lock that allowed the handle to move, with an
interlock that won't allow the key to lock the handle unless the handle has
first been used to lock the latches.
It's a little more complicated that a mortice lock, but once you've had it
demonstrated to you or you've read the instructions, that knowledge can be
used for every modern lock that you might encounter.
I want it to be simple, like the old doors. The handle allows you to open the door. The key locks the door. Those are two seperate things that should not be connected. The key simply moves a separate bolt across which is nothing to do with the handle:
Notice the handle at the top moves the top latch. The key moves the bottom latch.
And you're wrong - if you shut a 7-point door without locking it, only one latch engages, the standard one to hold it shut, next to the handle. To lock it, you need to engage the other 6, which means lifting the doorhandle (very unintuitive, handles always go down), then turning the key. Trying to turn the key without lifting the handle can break the key, since the little key cannot move 6 bolts.
I don't think the key is even *trying* to move the bolts. I think the reason
that the key would break if you applied enough force is that it is blocked
from turning while the bolts are retracted. The way to prove this would be
to try to lock the door when it is open, which would allow the bolts to be
extended without the extra friction of each bolt against its striker plate
in the frame. I just tried this and the bolts did not move. The only way to
move the bolts on a modern lock is to raise the handle - and I agree, it
*is* counter-intuitive to raise it rather than lowering it.
Of course it takes a special sort of stupidity to apply more and more force
to the key, in an attempt to unlock the door, instead of thinking "the key
isn't turning - I must be doing something wrong". It's difficult to remember
back to the first time I encountered a lock like this. I *think* I might
have tried lowering the handle to see if that made any difference, and then
tried raising it - ah, that's the trick.
You can get a problem with a badly-adjusted door where the handle doesn't
quite shoot the bolts fully out, and so the key won't turn. When we had a
new door installed (or rather an existing door and frame moved by the
builders to a newly-cut aperture in the wall), it wasn't quite adjusted
correctly and it was necessary to pull the handle up quite firmly and hold
it in that position in order for the interlock to be cleared so the key
would turn to lock the handle. But that was soon sorted out.
The trouble is if you do it wrong, it doesn't take much force to break the key. When it doesn't turn, do you add more force or have you done something else wrong? It's like flushing a toilet, how hard do you push the lever? Too hard and it breaks, not hard enough and it won't flush. There's a fine point in the middle somewhere where the device functions.
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