heavy sprung mortice locks

wallofbeans

Might this do the trick? It says "suitable for sprung and unsprung door furniture" so could be a winner, unless I'm missing something... which is reasonably likely!

https://www.ironmongerydirect.co.uk/product/hampstead-architectural-bathroom-lock-78mm-case-57mm-backset-satin-stainless-steel-429669

BUFF

wallofbeans said:

I only want to use actual antique door knobs if possible, rather than tradditonal style ones, and I don't think any old door knobs are sprung. I didn't realise that getting locks to work with them would be so complicated though!

They probably used originally larger (5" or 6") & stronger latches. These are still available from the likes of Imperial but you would need to check that they would be able to be used with the existing sashlock recess (you would of course need to lengthen the pocket & fill the existing spindle holes).

wallofbeans

BUFF said:

wallofbeans said:

I only want to use actual antique door knobs if possible, rather than tradditonal style ones, and I don't think any old door knobs are sprung. I didn't realise that getting locks to work with them would be so complicated though!

They probably used originally larger (5" or 6") & stronger latches. These are still available from the likes of Imperial but you would need to check that they would be able to be used with the existing sashlock recess (you would of course need to lengthen the pocket & fill the existing spindle holes).

Ah, okay - that makes sense. None of the doors here can be original doors then. 

What do you make of the 'Hampstead' locks I link to above? Might be worth a try?

BUFF

wallofbeans said:

. 

What do you make of the 'Hampstead' locks I link to above? Might be worth a try?

It's an Eurospec in disguise - so knowing that you may be able to buy cheaper if you hunt.
https://www.carlislebrass.com/products/locks-and-latches/bathroom-locks/bathroom-lock-51164

Because it's a square case rather than having the corners angled you will have to do a little woodworking with a chisel (but it shouldn't be hard) .