Year: 1896

page_text: I, JOSEF RUDOLF GEITH of 19 Bahnhofs-strasse Coburg, Germany, Chamotte
and Earthenware Manufacturer, do hereby declare the nature of this invention to
be as follows:-
All endeavours to increase the efficiency and decrease the enormous expense
of fuel in the simple muffle stove, have led to the construction of the so-called
draught-muffle, with and without preliminary warming of the articles. The
draw-backs and the very limited range of application of such muffles are well
known.
The attempt to warm, melt and again cool the articles in a single tunnel-like
space failed, as is well known, because it was impossible on
absolutely necessary great length of the muffle furnace, to push the long row of
transport vessels without destroying their contents; and, on the other hand,
because the mechanical means of transport inside the muffle were not durable on
account of the high temperature.
By the present construction these difficulties are now obviated.
The muffle furnace serves for melting colors, glazes, enamelling etcetera, the
articles to be treated being first gradually warmed in an adjoining muffle-chamber,
burned in, and then again gradually cooled. The heated gases which pass off are
utilized for the preliminary warming of the articles; and the radiating warmth, for
warming the air used in the burning in.
The muffle furnace consists of a long inclined muffle, the inclination of which
towards the horizontal being so calculated, that when the muffle is quite full, the
contents remain easily movable. The muffle chamber above and below is enlarged
laterally to form recesses, which serve for reception of the articles, and are closed
with doors.
In the centre of the muffle, the crucible proper, is the fire. The heated gases
which pass off spread themselves over the upper part of the muffle and enter
through passages, provided with dampers, to the chimney-flue..
The lower part of the muffle is surrounded by passages, which are connected by
channels, provided with dampers, and a channel, with the closed off space under
the grate.
The air for burning spreads itself throughout the lower part of the muffle and
passes through channels in a warm state under the grate.
Warm air can be let directly into the fire-box through other channels.
The working operation is simply as follows: The articles are pushed into the
upper part of the muffle and are then pushed little by little further in to the
crucible which they thus slowly reach in a warm condition. The articles remain
in the crucible till completely ready, which can be seen by looking through the
sight-tube. The are then, by further pushing, shoved from the upper into the
lower part of the muffle, which leaves them cooled below.
In addition to the contents of the muffle being easily movable, due to the position
of the muffle, the inclined muffle has also the peculiarity that the heated inner air

page_text: of the muffle, following the natural tendency, streams up towards the articles to be
warmed, whilst the cold air arising through exterior cooling in the lower part of
the muffle, streams down to the articles to be cooled.
Dated this 20th day o
1000
Improved Draught-muffle Furnace.
I, JOSEF RUDOLF GEITH of 19, Bahnhofs-strasse, Coburg, Germany, Chamotte
and Earthenware Manufacturer, do hereby declare the nature of this invention,
and in what manner the same is to be performed to be particularly described and
ascertained in and by the following statement :-
All endeavours to increase the efficiency and decrease the enormous expense
of fuel in the simple muffle-stove have led to the construction of the so-called
draught-muffle, with and without preliminary warming of the articles. The
draw-backs and the very limited range of application of such muffles are well
known.
The attempt to warm, melt and again cool the articles in a single tunnel-like
space failed, as is well known, because it was impossible on account of the
absolutely necessary great length of the muffle furnace to push the long row of
transport vessels without destroying their contents and on the other hand, because
the mechanical means of transport inside the muffle were not durable on account of
the high temperature:
By the present construction these difficulties are now obviated.
The muffle furnace shewn in Fig. 1 in vertical section (A B Fig. 2.) Fig. 2 in
cross section (C D Fig. 1) and Fig. 3 horizontal section (EF Fig. 1.) serves for
melting colors, glazes, enamelling etcetera, the articles to be treated being first
gradually warmed in an adjoining muffle-chamber, burned in, and then again
gradually cooled. The heated gases which pass off are utilised for the preliminary
warming of the articles, and the radiating warmth for warming the air used in the
burning in.
The muffle furnace consists of a long inclined muffle a the inclination of which
towards the horizontal being so calculated, that when the muffle is quite full, the
contents remain easily movable. The muffle-chamber above and below is enlarged
laterally to form recesses a' a' which serve for reception of the articles, and are
closed with doors.
In the centre of the muffle, the crucible proper is the fire b. The heated gases
which pass off spread themselves over the upper part of the muffle and enter
through the passages d d, provided with dampers c c, to the chimney-flue e.
The lower part of the muffle is surrounded by passages, which are connected by
the channels ggg, provided with dampers fff, and the channel with the closed off
space under the grate.
::
The air for burning enters by i, spreads' itself throughout the lower part of the
muffle and passes through the channels g g g, in a warm state under the grate.
Warm air can be let directly into the fire-box through the channels kkkk.
The working operation is simply as follows:
The articles are pushed into the upper part of the muffle, and are then pushed
little by little further in to the crucible, which they thus slowly reach in a warm
condition. The articles remain in the crucible' till 'completely ready which can be
seen by looking through the sight-tube . They are then, by further pushing
shoved from the upper into the lower part of the muffle, which leaves. them cooled
below.

page_text: In addition to the contents of the muffle being easily movable, due to the
position of the muffle the inclined muffle has also the peculiarity that the heated
inner air of the muffle following the natural tendency streams up towards the
articles to be warmed whilst the cold air arising through exterior cooling in the
lower part of the muffle, streams down to the articles to be cooled.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is:
Continuous muffle-furnace for melting colors, glazes, for enamelling etcetera with
long muffle, which inclines towards the horizontal, to promote transport of the
contents, the central part of which muffle serves as crucible, the upper part as
preliminary warming chamber, and the lower part as cooling chamber, as
described.
Dated this 25th day of October 1896.
JOSEF RUDOLF GEITH.