Патент USA US2128129код для вставки
Aug‘. 23, 1938. M'. M. FARLEY ‘2,128,129 STEREOTYPE METALv FURNACE Filed Sept. 25. 1955 2 Sheets-Sheet 1 Aug. v23, 1938. M. M. FARLEY 2,128,129 STEREOTYPE METAL FURNACE ~ Filed Sept. 25, 1935 2 Sheets-Sheet 2 Patented Aug. 23, 1938 2,128,129 ' . UNITED ‘STATES PATENT. ,o-FFw-E ‘ 2,128,129 STEREOTYPE METAL FURNACE Marcus M. Farley, Battle Creek, Mich., assignor to Duplex Printing Press Company, Battle Creek, Mich., a corporation of Michigan Application September 25, 1935, Serial No. 42,124 1 Claim. This invention is an improvement in stereotype metal casting apparatus, and its object is to con serve and utilize the waste heat of metal melting furnaces (especially those used for melting stere otype metal in making printing plates), to keep the metal discharge spout as near as possible to the temperature of the metal in the melting vpot as the metal passes through the spout to the casting box. The melting temperature of stere otype metal is low and in its passage from the pump through the discharge spout it ordinarily loses .considerable heat, and consequently the temperature of the metal at the discharge point may sometimes be too low to produce plates of good printing qualities; or the temperature‘ of the metal in the pot must be kept higher than necessary, to allow for the ‘drop in temperature of the molten metal while passing through the spout; but at such high temperatures some com 20 ponents of stereotype metal will volatilize and re duce the quality of the metal necessary for mak ing perfect plates. If the metal is kept at the proper casting temperature in the melting pot, there is a possibility of some of the metal “freez 25 ing” or adhering to the spout, which affects the accuracy of the casting. Heretofore attempts have been made to over come the above mentioned objections by heating the exposed part of the spout by auxiliary gas 30 burners, or electric heating elements, which are expensive and troublesome. My invention elim inates the need of any extra heating apparatus and insures maintenance of the proper tempera ture of the metal delivered to the casting box. The accompanying drawings illustrate two em 35 bodiments of the invention as applied to two types of metal melting pots and pumps. I will explain the'invention as disclosed in said draw ings, and summarize in the claims the essentials 40 of the invention and novel features of construc tion and combinations of parts for which protec tion is desired. In said drawings:Fig. 1 is a plan view of a metal melting pot and 45 pump equipped with an embodiment of my in (Cl. 22—2) and has within it an ordinary melting pot 2. Ac cess can be had through a door lb! to the com bustion chamber in the furnace below the melt ing pot. - Within the pot 2 is arranged a melting pump 4 of any suitable construction having a discharge spout 4a through which the metal can be con ducted to a casting box In of any suitable type. The pump 4 may be operated in the usual man ner by a hand lever 40 as indicated in the draw ings. The spout is fastened to the outlet of the pump and extends upwardly and outwardly to a point exterior to the pot so that the metal, when the pump is operated, can flow through the spout and be discharged therefrom by gravity into a stereotype plate casting box 10 standing beside the pot; the metal ?lling the box by gravity or hydrostatic pressure. The molten metal is pumped through spout 4a to the casting box l0, and to prevent injurious drop in temperature of the metal passing through the spout from the pump to the mold I utilize hot waste gases to heat the spout. The pot has a hood 6 to catch the hot products of combus tion and direct them to the outlet. The spout 4a extends throughv an opening in the hood as shown. In the type of furnace shown in Figs. 1 and 2, the melting pot shown in Fig. 1 is heated from below by the use of coal, coke, oil, or gas, and the products of combustion escape through an out let I a in the hood into a pipe which conducts the gases to any desired point of discharge. In utilizing my invention, the furnace outlet la is connected by a pipe 3 with a pipe or jacket 5 surrounding the spout 4a for the greater por tion of its length. The inner end of said jacket is connected with the opening in the hood through which the spout projects, and the out er end of the jacket has an opening connected‘ with a discharge pipe 5a. The heated products of combustion pass from the furnace into the jacket 5 and heat the spout 4a. After passing into and through jacket 5 the products of com bustion may pass through pipe 5a. to any suit 45 vention. Fig. 2 is a side elevation partly in section of able point of discharge. Fig. 1. the melting pot, connected directly with a ?ue, to protect the operator and carry off the fumes and heat from the melted metal. To utilize the heat of the molten metal the upper end of the furnace and open end of pot 2 may be covered by a metal hood 6 and the inner end of the jacket 5 connected to said hood so that not only the products of combustion but also the heated gases 55 Fig. 3 is a plan View of another form of melt 50 ing pot and pump equipped with an embodiment of my invention. Fig. 4 is a side elevation of Fig. 3. Figs. 1 and 2 illustrate an ordinary melting pot and furnace for melting stereotype metal. The 55 furnace I may be of any suitable construction, It is common practice to install a hood over 2 2,128,129 rising from the molten metal in the pot will be conducted into and through the jacket 5 to main tain the spout 4a at a high temperature. Fig. 3 illustrates a practical embodiment of the invention used with a furnace in which the metal is heated by means of heating elements l2 im mersed in or directly applied to the pot 2. In this construction the heat rising from the metal in the pot is' directed by the hood 6 into and 10 through the jacket‘ 5 surrounding the spout 4a and maintains the spout at the desired high tem-' perature. I claim : Apparatus of the character speci?edv compris ing a metal melting furnace having an outlet for waste gases of combustion; a metal pot on said furnace, a hood over the pot, a metal pump in the pot, a spout connected with the pump and extending from the pump to a point outside the hood, a jacket connected with the hood and sur rounding the exposed portion of the spout, a pipe for directing hot waste gases from the outlet of the furnace into said jacket, and a discharge 10 for the hot gases at the outer end of said jacket. MARCUS M. FARLEY.