[tbarban]

Originally Posted by Ronnie314

You would make one complete chain run from bottom of robot to a tad higher than the highest point you want to lift to. You then would fasten your carriage to a certain section of that chain permanently. You would then rotate chain up or down and carriage will move with it.

(I am assuming you will be utilizing a single stage or "zero stage" where you just have a frame and then a carriage inside of the frame...the carriage being the only moving level.
-Ronnie

Thanks Ronnie!