Miles, did you just cad that? I wish I was that fast. I only know sketchup. If that's sketchup, you're much better than I am at it.
How difficult would it be to draw Anytime Bike's "cogged" sprocket running on the inside?
My brother has a small machine shop. I might tease him with a...
Actually two equal sized chainrings,
...and a handful of the right ID drill shaft stock pieces might produce one fairly easily.
Mount up both rings, with spacers between, on a crank. Spacers should set the rings exactly so that they are approx the width of your inner chain links.
Measure...
Yes. Interesting ideas there.
Here's another closely related drive. I'm sure this one well known here.
I wonder what the noise and vibration level is with the "lantern", or as the Anytime bike calls it "barrel cog" sprocket? If more (any?) of that style of sprocket, either as a drive...
Very interesting. Found this thread while looking for information on "lantern" gears. No modern types available. But a lantern gear might make an interesting approach to an "internal tooth" ring gear sprocket. If it were made chain-pitch a small sprocket could be run inside of it as pinion...