I have been fiddling with this chuck for a few days to get it somewhat cleaned
out enough to try to figure out how it can be disassembled.
These pictures show the chuck as it is now:
 

https://s25.postimg.org/8m3hcw7sv/chuck_back.png
https://s25.postimg.org/hie9gtyf3/chuck_front.png
https://s25.postimg.org/hjo7a908v/chuck_front_2.png
https://s25.postimg.org/ft568ripr/chuck_side.png

The collar rotates 3-1/2 times from the stop at full lock to stop at full free.
The threading is 40TPI, as measured by total travel of the collar over 3-1/2
revolutions. The two pictures from the front show that it is a ball driven by
the collar (inside) and there is not a significant gap between the collar and
the body. From the back, there is a gap visible between the collar and body, and
what at first look appeared to be a sprung ring inside to hold it together.
Close examination leads me to believe my first look was wrong, as what appeared
to be an overlapped gap, like a scarf jointed key ring, isn't.


The stereo views below show that a bit better (cross-eye stereo):


https://s25.postimg.org/63hsc7m2n/chuck_wide_stereo_small.png
https://s25.postimg.org/kwwfwyttr/chuck_stereo_close_2_small.png
https://s25.postimg.org/m0gk8xegv/chuck_stereo_close_small.png

I am wondering if maybe this is press fit together? Or if that IS a scarf
jointed ring at the back and it is so rusty/grimy/tight I just can't get a
purchase on it?

Any ideas how to get this apart? I want to both do up a CAD model, since I am
that kind of geek, and clean the parts thoroughly of rust. If I need to, once it
is apart, I can also make repair parts. The rest of the tool is in good, though
not new, shape, so it is a user if I can clean up the chuck, not a museum piece.

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