On 11/03/2010 09:05, David WE Roberts wrote:
The back door lock has always been a bit of a puzzle.

In a UPVC door.
One full turn and the door is locked but the handle is still floppy.

First turn throws the bolt as for a conventional mortice lock.

Another full turn and the handle firms up.
Another half turn or so before it seems to finish locking.


Second turn (and a bit) throws the mechanism on the multi-point bolts.
You should see this happening if you lock the door whilst it's open.


I don't think I have ever encountered a lock with so many turns between
locked and unlocked.
I would normally expect all this to happen within 3/4 to 1 1/4 turns.


There are loads of different manufacturers of UPVC door locks. Each has
his own variation on mechanism.

The lock is now refusing to unlock from the second turn to the first
turn without a lot of juggling, cursing, swearing etc.

Something is broken or very worn either inside the main lock case or
between the main lock case and the satellite mechanisms.

so I am about to
take it out and try and get a replacement.

OK

Lubrication via the key this morning made it worse instead of better.

Sounds like a coincidence.

If locked on the first turn only it seems fine but if you overshoot then
it is a lot of hassle.
Not good if you want to get out in a hurry!



The runes of doom keem coming up with "Specialist lock integrated in
door. New door please."

New door only if you get to the point where you can't open the door at
all and you trash the door getting it open!

I am trying to ignore them and will sacrifice a virgin for an
alternative reading (although sourcing one may be a problem around here).


www.dgsupplyline.co.uk

HTH