SHAPED SAGER FOR ROASTING INSULATORS OF SPARK PLUGS Russian patent published in 2000 - IPC

FIELD: roasting insulators of spark plugs for internal combustion engines. SUBSTANCE: shaped sager consists of rectangular ceramic box with ports in side walls and bearing surface in inner [art along walls. Height of bearing surface is equal to sum of heights of cylinder, expanding cone and half height of band of unroasted insulator and its thickness is no less than half difference of diameters of band and guide cylinder of unroasted insulator of spark plug. EFFECT: increased output of insulators; increased productivity of high-temperature furnaces; low cost of product. 4 dwg, 1 tbl