LsFarm wrote:Yep, made sense to me, the rod attaches to the grates, probably some kind of a grate 'bed' or framework that either rolls or swings on a pivot or something similar to reduce friction...
The back and forth action creates a 'pumping' motion that feeds fresh coal, and shoves the ash off the end..
Maybe this spring when you shut it down for the summer and do your spring cleaning and maintenance, you can get some photos so we can all learn how it works..
Yeah, I haven't figured out how it reciprocates so smoothly in such a hostile metal-to-metal environment. But somehow it does. .
The answer is, lots of cast iron!
There is a 1" thick cast iron plate that the grates fit into. This grate plate is pulled up and down the ramp by the rod sticking out of the back of the stoker.
This forces coal and ash down the grate on the up stroke, and loads coal onto the grate on the down stroke.
There seems to be a lot of variation over the years in these mechanisums. I have two of them and they are very different in how the linkage between the gear box and the grate plate is layed out. Member Dragonslayer has one that is different than the two that I have. That one Greg posted photos of earlyer in this thread is yet another variation.
The two that I have, everything is cast iron but the blower housing and the steel rods. Not only are the grates, side rails and grate plate cast iron, the whole base, blower extension, levers and coal feeders are all cast iron. The whole thing put together must be close to 200 pounds!