Patent ID: 7694636

Claim:
A furnace comprising: a furnace housing defining an inner space therein; a perforated tray mounted in said furnace housing, dividing said inner space into upper and lower chambers, adapted to support a combustible material thereon, and formed with a plurality of apertures for passage of ash therethrough; and a stirring rod disposed rotatably on said perforated tray for stirring the combustible material on said perforated tray, said stirring rod having top and bottom ends, two opposite lateral ends, a middle portion, and opposite first and second portions, each of which extends from said middle portion to a respective one of said lateral ends, each of said first and second portions having an inclined face that extends between said top and bottom ends of said stirring rod from the respective one of said lateral ends toward said middle portion of said stirring rod, that is inclined relative to said perforated tray, and that faces toward said perforated tray.