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
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.
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1. A 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
1. A 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 refractory sidewall enclosing sides of a kiln shelf, the sub-chamber having an upper end substantially blocked by the kiln shelf, the at least one of the burners being located to fire into the sub-chamber and directed toward the kiln shelf, the firing chamber having a bottom engaging the sub-chamber sidewall. 2. The kiln of claim 1, wherein the at least one burner is located in a hole in the refractory bottom and emits combusted gases directly against a bottom of the kiln shelf which is located a few inches from the refractory bottom. 3. The kiln of claim 2, wherein the firing chamber has a bottom and a top, with the bottom of the firing chamber resting on a top edge of the sub-chamber sidewall. 4. The kiln of claim 1, wherein the firing chamber has a top configured to engage a lifting device to raise and lower the top vertically. 5. The kiln of claim 4, the firing chamber has a bottom engaging a tubular extension chamber having insulated walls and a bottom configured to engage the sub-chamber sidewall. 6. The kiln of claim 5, further comprising a lifting device having a pulley actuated arm engaging the top of the primary firing chamber during use and raise and lower the primary chamber vertically along a longitudinal axis of the kiln. 7. The kiln of claim 6, wherein the lifting device comprises a vertical pole having a longitudinal axis and a laterally extending arm having a first end connected to a sleeve constrained to move along a length of the pole and able to rotate about the longitudinal axis of that pole, and further comprising at least one pulley connected to a pulley base that is configured to rotate about the longitudinal axis of the pole;a cable passing over the at least one pulley, the cable having a first end engaging the arm and a second end connected to one of a counterweight or a winch to raise and lower the lift art, sleeve and primary firing chamber. 8. The kiln of claim 7, further comprising a first guide tube extending outward from the primary firing chamber, and further comprising: a guide post aligned with the longitudinal axis of the pole and sized to releasably engage the first guide tube and constrain the guide tube to move along the guide post as long as the guide post is engaged with the first guide tube. 9. The kiln of claim 8, wherein the primary chamber has a vertical height H and the guide post and guide tube engage for a length of at least about H. 10. The kiln of claim 9, further comprising a second guide tube extending outward from the extension firing chamber, the second guide tube being sized and located to releasably engage the guide post and constrain the second guide tube to move along the guide post as long as the guide post is engaged with the second guide tube. 11. The kiln of claim 10, wherein the primary chamber has a vertical height H and the guide post and guide tube are configured to engage for a length of less than H. 12. The kiln of claim 7, wherein the at least one pulley comprises two pulleys each rotating about separate longitudinal axes which axes are parallel and spaced apart, both pulleys being mounted to the pulley base. 13. The kiln of claim 1, further comprising a lifting device having a pulley actuated arm engaging the top of the primary firing chamber during use to and raise and lower the primary chamber vertically along a longitudinal axis of the kiln. 14. The kiln of claim 13, wherein the lifting device comprises a vertical pole having a longitudinal axis and a laterally extending arm having a first end connected to a sleeve constrained to move along a length of the pole and able to rotate about the longitudinal axis of that pole, and further comprising: at least one pulley connected to a pulley base that is configured to rotate about the longitudinal axis of the pole;a cable passing over the at least one pulley, the cable having a first end engaging the arm and a second end connected to one of a counterweight or a winch to raise and lower the lift art, sleeve and primary firing chamber. 15. The kiln of claim 14, further comprising a first guide tube extending outward from the primary firing chamber, and further comprising: a guide post aligned with the longitudinal axis of the pole and sized to releasably engage the first guide tube and constrain the guide tube to move along the guide post as long as the guide post is engaged with the guide tube. 16. The kiln of claim 15, wherein the primary chamber has a vertical height H and the guide post and guide tube engage for a length of at least about H. 17. The kiln of claim 16, wherein the primary chamber has a height H1 and the extension chamber has a height of about H2, and the guide post has and the second guide tube are configured to be engaged for a length of at least about H1+H2. 18. The kiln of claim 17, wherein the primary chamber has a vertical height H and the guide post and guide tube are configured to engage for a length of less than H. 19. The kiln of claim 14, wherein the at least one pulley comprises two pulleys each rotating about separate longitudinal axes which axes are parallel and spaced apart, both pulleys being mounted to the pulley base. 20. The kiln of claim 19, wherein the two pulleys are connected by a brace and wherein the pulley base has a tubular portion sized to fit over a distal end of the pole and rotate about a longitudinal axis of that pole, the tubular portion having a closed end of sufficient strength to rest on the distal end of the pole during use. 21. The kiln of claim 1, further comprising: a lifting device having a pulley actuated arm engaging the top of the primary firing chamber during use to and raise and lower the primary chamber vertically along a longitudinal axis of the kiln, the pulley actuating the arm vertically being mounted to rotate laterally in a plane orthogonal to the longitudinal axis of the kiln to allow rotation of the primary firing chamber in said plane. 22. The kiln of claim 21, further comprising a first guide tube extending outward from the primary firing chamber, anda guide post aligned with the longitudinal axis of the kiln during use and sized to releasably engage the first guide tube and constrain the first guide tube to move along the guide post and restrain rotation of the kiln in said plane, the guide post having a length selected to allow the first guide tube to move off the guide post and all rotation of the kiln in said plane. 23. The kiln of claim 1, wherein the resistance to heat transfer through the sidewall of the primary firing chamber is greater than the resistance to heat transfer through the sub-chamber sidewall. 24. A 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 having a vent therein, the firing chamber having a bottom opposite the top,a sub-chamber located below the firing chamber during use, the sub-chamber having a refractory bottom and having refractory sidewall, the sub-chamber having an upper end substantially blocked by a kiln shelf the sides of which are enclosed by the sub-chamber sidewall, the burners being directed toward the kiln shelf, the firing chamber having a bottom supported by the sub-chamber sidewall;the firing chamber having a bottom engaging a tubular extension chamber having insulated walls and a bottom configured to engage the sub-chamber sidewall; anda lifting device having a pulley actuated arm engaging the top of the primary firing chamber during use to and raise and lower the primary chamber vertically along a longitudinal axis of the kiln. 25. The kiln of claim 24, wherein the pulley actuating the arm vertically is mounted to rotate laterally in a plane orthogonal to the longitudinal axis of the kiln to allow rotation of the primary firing chamber in said plane; and further comprising a first guide tube extending outward from the primary firing chamber, anda guide post aligned with the longitudinal axis of the kiln during use and sized to releasably engage the first guide tube and constrain the first guide tube to move along the guide post and restrain rotation of the kiln in said plane, the guide post having a length selected to allow the first guide tube to move off the guide post and all rotation of the kiln in said plane. 26. A 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 with a vent therein, the firing chamber having a bottom opposite the top,a sub-chamber located below the firing chamber during use, the sub-chamber having a refractory bottom and having a sidewall that provides some insulation to heat transfer through the sub-chamber sidewall, the sub-chamber having an upper end substantially blocked by a kiln shelf, the burners being directed toward the kiln shelf bottom, the firing chamber having a bottom engaging the sub-chamber sidewall;the firing chamber having a bottom engaging a tubular extension chamber having insulated walls and a bottom configured to engage the sub-chamber sidewall; anda lifting device having a pulley actuated arm engaging the top of the primary firing chamber during use to and raise and lower the primary chamber vertically along a longitudinal axis of the kiln, the pulley actuating the arm being mounted to rotate laterally in a plane orthogonal to the longitudinal axis of the kiln and to allow rotation of the primary firing chamber in said plane,a first guide tube located outward from the primary firing chamber and parallel to the longitudinal axis, anda guide post aligned with the longitudinal axis of the kiln during use and sized to releasably engage the first guide tube and constrain the first guide tube to move along the guide post and restrain rotation of the kiln in said plane, the guide post having a length selected to allow the first guide tube to move off the guide post. 27. The kiln of claim 26, wherein the sub-chamber sidewall is a castable refractory material. 28. The kiln of claim 26, further comprising a secondary firing chamber having thermally insulated sidewalls surrounding the longitudinal axis, the secondary firing chamber having an open top and open bottom and interposed between the primary firing chamber and the sub-chamber sidewall during use and supported by the sub-chamber sidewall during use. 29. A kiln for firing pottery, the kiln having at least one burner emitting sufficient heat into a primary tubular firing chamber having a longitudinal axis to fire pottery, comprising: a primary firing chamber having thermally insulated sidewalls surrounding the longitudinal axis and a closed top having a vent therein, the firing chamber having an open bottom opposite the top, and at least one vent in the primary firing chamber;a sub-chamber located below the firing chamber during use, the sub-chamber having a bottom of refractory material and sidewalls of a cast refractory material suitable for use in a kiln, the sub-chamber having an upper end substantially blocked by a kiln shelf located below a height of the sub-chamber sidewalls and having a bottom of the shelf a few inches away from the sub-chamber bottom, the at least one of the burners being located to fire into the sub-chamber and heat the kiln shelf, the firing chamber supported by the sub-chamber sidewall during use. 30. The kiln of claim 29, wherein only the sub-chamber has a burner. 31. The kiln of claim 29, further comprising a secondary firing chamber having thermally insulated sidewalls surrounding the longitudinal axis with an open top and open bottom and interposed between the primary firing chamber and the sub-chamber sidewall during use and supported by the sub-chamber sidewall during use. 32. The kiln of claim 29, further comprising a lifting device having a pulley actuated arm engaging the top of the primary firing chamber during use to and raise and lower the primary chamber along the longitudinal axis, the pulley actuating the arm rotating about an axis parallel to the longitudinal axis. 33. The kiln of claim 29, further comprising a pulley having a cable with a first end connected to a lift arm that is connected to the primary firing chamber to lift and lower the primary firing chamber, the pulley being rotatably mounted on a pole to rotate about a longitudinal axis of the pole parallel to the longitudinal axis of the kiln. 34. The kiln of claim 33, further comprising a first guide member extending parallel to the longitudinal axis of the kiln and connected to the primary firing chamber, anda guide post aligned with the longitudinal axis of the kiln during use and located to releasably engage the first guide member as the primary firing chamber moves along the longitudinal axis, the guide post having a length selected to allow the first guide member disengage from the guide post. 35. The kiln of claim 34, further comprising a counterweight connected to a second end of the cable. 36. The kiln of claim 34, wherein there is more than one burner and all burners fire into the sub-chamber.
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