I got a railroad forge from craigslist a few years ago. beautiful flywheel, but rather rusty. I ran the blower on an electric motor for a while instead. I decided I wanted less noise and more control. There are a few variations out there for people powered blowers, one of the most common being the hand-crank blower.
This one is a bit rarer as far as I can tell. Perhaps that's because of its relative mechanical complexity. However, unlike all of the hand-crank blowers that I've seen, it does not require gears. It's all belt driven.
so I looked it up.
it says that the flanged disk (I), and the carrier (A), are both to spin freely on the shaft. They were so horribly seized on there that I figured the best option would be to tear the assembly down and press it apart.
now, with the flywheel off, I removed the shoes. I scrubbed the edge of the interface between the flange and the shaft with a wire brush and squirted penetrating lube onto it.
Next was the pulley on the blower. It had a good inch of travel in one direction and I wanted an extra degree of freedom in aligning the flat belt. The bearing housing (held in by one 3/8" screw) was easy to remove.
It looked familiar. I'd seen it before when browsing other patents filed by the same guy. Henry B. Keiper of Lancaster, PA was the founder of the Champion Forge and Blower company. He patented this as an "oscillating bearing." It's loosely constrained to accommodate non-ideal conditions where the two bearings are not perfectly coaxial. The shaft is axially constrained by a threaded plug which is jammed with a mating nut.
Next, I made some hardware to move the lever action to a comfortable height. The hardware consists of a couple of loops and a connecting rod to constrain the motion of the cast iron lever to the ball end to a wooden lever that the user operates.