I live in a 1946 bungalow with crank out (on a chain) wood frame windows made by Curtis. They are 1866 Pat 2,048,131. One window will not crank in or out. How do i fix this and where can I get parts?
Is the problem hinge bind? Free up the hinges. Is the problem gear/chain bind? Free those up and lubricate everything with a light oil, such as 3-in-1 or WD40, just don't get too crazy and have a bunch of runoff that is going to stain the wood and attract lots of dirt.
If the problem is worn out bushings, then you'll have to source new bushings, make some, or have some made. Don't know if Curtis is still around, even if they are, they don't likely have parts for old windows.
Finding parts for a window from that era is a long shot. Curtis window co. folded many years ago. That leaves you with the option to fabricate your own parts...can you?
Even if you had parts and the knowledge how to fix it - you'd still have an old window.
Consider replacing it.
This supplier carries a very broad range of casement operating hardware:
You're probably on you own trying to fix it. Take it apart and try to figure how it is supposed to work and what's causing the problem. Then fabricate, repair or buy what it needs.
is it this one?