Electric heating furnace
AssigneeSola Basic Industries, Inc.
InventorsBenjamin S. Beall, III, Russell F. Novy
Life of this patent
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Abstract
An electric heating furnace which includes a conductive electric resistance heating element strip mounted within a chamber defined by walls of porous refractory insulating material. Terminal or mounting pins extend through the wall of insulating material and the heating strip are secured thereby. A sleeve of non-porous refractory material surrounds the portion of the pin within the wall of insulating material for electrically insulating the pin from the porous refractory wall material which may have a conductive layer of carbon build up therein under certain heat treating conditions.
Claims5
In an electric heating furnace for heat treatment having a body with side walls of porous insulating material defining a chamber therein to receive material for heat treatment, the improvement comprising a conductive electric heating resistance strip within said chamber adjacent to the inner hot face of a side wall of porous insulating material for electrically heating said chamber, a plurality of pins each extending through said side wall and being connected to said resistance strip, said porous insulating material of said side wall being subject to the build up of an electrically conductive layer of carbon within the interior thereof spaced inwardly from said hot face if insufficient "burnout" is used, and a plurality of sleeves of dense non-porous refractory material, said sleeves being located in said side wall and surrounding the portions of the respective pins within said porous insulating material of said side wall for electrically insulating each pin from such electrically conductive layer of carbon for preventing the rapid deterioration of the pins which would otherwise be caused by electricity passing through said conductive layer of carbon forming an electrically conductive path.
Dependencies are inferred from the claim text.