What kind of lock am I after?

21 Nov 2011
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United Kingdom
Exterior door, already has two deadlocks, but one of the problems with deadlocks is that they're not very convenient for casual use - i.e. when one wants to just close the door in a way that you'd need a key from the outside but not from the inside.

The classic solution to this on normal doors is, of course, the "yale" lock - which is just a catch.

uPVC doors tend to be a little more sophisticated, and although the "key to open from outside, handle sufficient on the inside" concept is still valid, the locks sometimes combine with deadlock functionality.

I bought a sash lock - which has a handle and a deadlock in the same unit - slightly by mistake. I was somehow hoping that this would give a moderately secure yale-style "shut and go" solution suitable for popping out, while offering a "push the handle up and use the key" for something more secure, and then allowing auxiliary chubb-style deadlocks for maximum security.

Is it possible for me to buy an alternative lock mechanism that has the same centres as the sashlock, which would work in a more Yaley way?

Thinking about it, I'd probably settle for something where the euro-cylinder has a knob on one side and key-hole on the other.

FWIW, the sash lock was something like this:
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you can buy a euro-cylinder which has a knob on one side and key-hole on the other.

The "knob" is called a thumbturn

having got the cylinder, you can fit it to any lock case which accepts a Eurocylinder.

It might not meet the requirements of your insurance co though.

There are a few Mortice Nightlatches or Mortice Locking Latches on the market, AFAIR none of them meet the BS for burglar resistant locks which your insurance co probably requires.

Is there a reason you don't just fit a rim nightlatch?
Thanks for that - particiularly for teaching me the term "nightlatch". I think rim nightlatches (classic "Yale" locks, yes?) are ugly (as Prince Charles might say, they are "monstrous carbuncles"), which is why I didn't install one of those.

The thumbturn cylinder will be fine.

I should check with insurance, but I'd have thought that the other deadlocks would be sufficient - assuming they're used (which they will be)

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