In article ,
says...
Hi, I want to make a futon type adjustable sofa. Basically, I want to
make it so that I can adjust the angle of the back, just like car seats.
Could anybody give me how to make something like that?
Thank you very much in advance.


Basic deck chair design would be the easiest method. If you
truly want the mechanism hidden, you'll need to resort to
some fairly accurate metal work.
--
Mark

The truth as I perceive it to be.
Your perception may be different.