Expandable raku kiln
OwnerKellogg S. Johnsoninventor
Life of this patent
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Abstract
A raku kiln has a fire ring with a cylindrical sidewall and bottom made of refractory material with a kiln shelf supported a few inches above the bottom to enclose a space that is superheated by burners. A firing-chamber rests on the fire ring and is lifted by a two aligned pulleys on top of a pole which rotates to move the chamber out of the way. A vertical pole mates with tubes on the chamber for vertical guidance during raising and lowering of the chamber. Flanges on the lower end of the chamber allow adding an extension chamber.
Claims22
A raku kiln having at least one burner emitting sufficient heat into a primary tubular firing chamber for firing pottery;
- comprising:
- a primary firing chamber with a thermally insulated sidewall and a closed top, the firing chamber having a bottom opposite the top, and at least one vent in the primary firing chamber top,
- a sub-chamber located below the firing chamber during use, the sub-chamber having a refractory bottom and having a sidewall that provides more insulation to heat transfer through the sub-chamber sidewall than the chamber walls, the sub-chamber having an upper end substantially blocked by a kiln shelf, the burners being directed toward the kiln shelf, the firing chamber having a bottom engaging the sub-chamber sidewall.
Dependencies are inferred from the claim text.