Furnace ring
A stove ring is a flat, cast iron ring used to reduce the size of a round opening above the fire of a coal stove . Each ring is flattened on the outside at the bottom and the inside at the top so that the rings can be placed one inside the other and the top surface is flat for pots and pans. A circular disc can be placed in the innermost ring. This has a crossbar over a recess so that you can lift it out with a poker .
If you removed all of the oven rings, you could insert a special waffle iron into the opening.
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Wiktionary: Ofenring - explanations of meanings, word origins, synonyms, translations
