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Патент USA US2128129

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Aug‘. 23, 1938.
Filed Sept. 25. 1955
2 Sheets-Sheet 1
Aug. v23, 1938.
~ Filed Sept. 25, 1935
2 Sheets-Sheet 2
Patented Aug. 23, 1938
‘ 2,128,129
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
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
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
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
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-'
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.
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