Here is a crude design.
I have seen, but cannot seem to find an on-line image, a much more elegant design in older buildings, where for a center-pivoting window the exterior screen is shaped rather like half a barrel, rather than as a box. It's probably more expensive to build them that way.
The modern approach for top or side pivoting windows (awning or casement) in the USA is to have an interior screen and a window crank that allows opening and closing the window without removing the screen. Center pivoting windows are the difficult case, and as a result are rarely seen these days.