Those are rather like the kitchen door hinges with a virtual pivot point
located away from the door and arranged by a clever multi jointed lever
system that also has the closing and notch for keeping them shut.
Brian

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"Michael Chare" wrote in message
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On 02/09/2019 17:01, Chris Green wrote:
I'm after some hinges with one flap about 18mm across and the other
flap twice as much or even more. Are there such things and, if so,
what are they called?

If they don't exist then I'll have to make do with some flush hinges
which are sort of 'near enough' but may not be very robust.


There are things called "parliament hinges" which you can find with
google. Perhaps not exactly what you want but they may be suitable. I had
to use them for our back door so that it would clear the kitchen
cupboards.


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Michael Chare