FOURNEAU POUR RECUIRE L'ACIER

STEEL TEMPERING FURNACE

Revendications

Claim lst The process of hardening and tempering steel, placing the articles to be acted upon with a close retort or oven so arranged, in connection with a furnace, that the articles within the retort shall be heated by the diffusion of heat from the walls of the retort without being subject to the direct action of flames or heat from the furnace. 2nd The combination of a retort or oven, having a door, independent of the furnace door and set within the said furnace, so as to drive the fullest benefit from the combustion, without the possibility of the flame or direct heat entering the retort. 3rd The retort D set within a furnace and provided at intervals around its entire length with partitions El, to form narrow passages or flues E, said flues being arranged or opening alternately, first on one side, and then on the other, so that they take the draught from, and deliver it at alternate sides of the furnace, thus equalizing the distribution of the heat over the whole surface of the retort. 4th A furnace and retort with the doors H, consisting of the frames Hl, constructed to leave a margin of brick work between the inner edge of the furnace and retort openings, and the iron door fitted in with fire brick h. 5th The combination and arrangement in a furnace for heating steel in the tempering, of furnaces A C, retort D constructed with alternate opening and discharging flues E, El, blast pipe F F1 F2 and doors H H 112 composed of iron and fire brick. 6th A close retort or oven within a furnace, in combination with a pyrometer arranged to indicate the temperature of the interior of the closed retort containing the articles of steel being heated.