Sadly, the pedal grinder is put away in the garden shed. And when I say "put away," I mean buried. And we have a foot of snow coming in tomorrow.
Maybe I can get it out and get some pictures come spring. It is pretty cool. It uses a segmented chain and has a nice eccentirc cam that moves the wheel up and down as it turns, presumably so you can get an even edge on whatever you're sharpening. I still use it to sharpen garden tools.
After hunting around a bit online, I found a picture of a similar one. Note that the pedals in this one also look a lot like the cast iron pedals that started this thread.
David