IMPROVEMENTS IN FURNACES FOR MELTING METALS IN ORUCIBLES
Year: 1884

page_text: "
I. THORSTEN NORDENFELT of 53, Parliament Street in the City of Westminster,
Civil Engineer do hereby declare the nature of my invention for " IMPROVEMENTS
IN FURNACES FOR MELTING METALS IN ORUCIBLES a communication to me from
abroad by Carl Gustaf Wittenström of Motala, Edward Faustman and Peter
Ostberg of Stockholm in the Kingdom of Sweden, Civil Engineers to be as
follows:-
This invention has for its object improvements in furnaces to be employed in
melting metals in crucibles.
I use the flame escaping from the melting-room for heating the crucibles before
they are placed in the melting-room and by this arrangement I effect a considerable
saving of fuel and time.
In the annexed Drawings Figures 1, 2 and 3 represent different views of a
furnace constructed according to this Invention and adapted for firing with naptha
according to another patent of mine of this year N° 11543.
Figures 4 and 5 represent a furnace for firing with coko. Figures 6 and 7
represent a furnace for firing with coals. The three furnaces represented in
Figures 1 to 7 are specially intended for using plumbago-crucibles Figures 8, 9
and 10 represent a furnace on the same principle as the one represented in
Figures 1, 2 and 3, but constructed specially for clay-crucibles.
As shown in the drawings the furnaces are divided by partitions ce into three
parts a band of which a nearest to the fireplace is the melting room; 66' are
compartments for a preliminary heating of the crucibles and their contents; d is
the chimney; e e' are dampers between the furnace and the chimney.
The partitions ce may be built with interior channels through which.air passes,
as shown in some of the drawings. This is only for the purpose of cooling the
partitions, when blast is used for the firing as in the furnaces represented in
Figures 4, 5, 6 and 7, where i shows the blast supply; but also for the saving of
fuel when, as represented in the other drawings, the air from these channels is
drawn through the flue o into the fireplace by means of draft of the chimney. The

page_text: fluo o also serves for letting the products of combustion pass direct to the chimney
whilst the body of the furnace is open for the removal of the pots or for other
purposes. Suitable dampers control the passage. 9 g are lids on the furnace
provided with small holes for watching the melting. These holes are closed with
plugs h h.
In Figures 8. 9 and 10 is shewn a special arrangement for clay crucibles which
must be slowly heated to redness before being charged. 63 is a muffel placed in the
compartment b¹ and large enough to enclose four crucibles. The flame from the
compartment may bo led either all round the muffel into the chimney or below
the muffel direct into the chimney. Suitable dampers e e¹ control the passage.
The temperature of the muffel may be controlled by removing the lid g.
b
In using these my improved melting furnacos the crucibles receive the final
heating previous to pouring in the compartment a of the furnace nearest the
entrance of the flame. The crucibles in the further compartments b. bare receiving
a preliminary heating and will be shifted from the compartment b into a, from the
compartment 6 into b. The crucibles are first placed into the compartment b¹.
Dated this 10th October 1884.
CARPMAEL & Co.,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION
I THORSTEN NORDENFELT of 53 Parliament Street in the City of Westminster
Civil Engineer do hereby declare the nature of my invention for "IMPROVEMENTS
IN FURNACES FOR MELTING METALS IN CRUCIBLES," a communication from abroad
by Carl Gustaf Wittenström of Motala, Edward Faustman and Peter Östberg, Civil
Engineers, of Stockholm all in the Kingdom of Sweden and in what manner the
same is to be performed to be particularly described and ascertained in and by the
following statement :-
This invention has for its object. improvements in furnaces to be employed in
melting metals in crucibles.
I use the flame escaping from the melting room for heating the crucibles before
they are placed in the melting room and by this arrangement I effect a considerable
saving of fuel and time.
In the annexed Drawings in Figures 1, 2, and 3 are represented different views
of a furnace constructed according to this invention and adapted for firing with
naptha according to another Patent of mino of this year N° 11543.
Figures 4 and 5 represent a furnace for firing with coke which is filled in around
the pot in the chamber a.
Figures 6 and
represent a furnace for firing with coals. The three furnaces
represented in Figures 1 to 7 are specially intended for using plumbago crucibles.
Figures 8, 9 and 10 represent a furnace on the same principle as the one represented
in Figures 1, 2 and 3 but constructed specially for clay crucibles.
As shown in the drawings the furnaces are divided by partitions c c into three
parts a band of which a nearest to the fire place is the melting room; bare
compartments for a preliminary heating of the crucibles and their contents―d is
the chimney—e, e' are dampers between the furnace and the chimney.
The partitions c. c may be built with interior channels through which air passes
as shown in some of the drawings. This is not only for the purpose of cooling the
partitions when blast is used for the firing as in the furnaces represented in
Figures 4, 5, 6 and 7 where i shows the blast supply-but also for the saving of
fuel when as represented in the other drawings the air from these channels is
drawn through flue o into the fire place by means of the draft of the chimney.
The flue o also serves for letting the products of combustion pass direct to the
chimney whilst the body of the furnace is open for the removal of the pots or for
other purposes. Suitable dampers control the passage-9. 9 are lids on the
furnaces provided with small holes for watching the melting These holes are
closed with plugs h h.
In Figures 8, 9 and 10 is shown a special arrangement for clay crucibles which
must be slowly heated to redness before being charged is a muffel placed in the
compartment and large enough to enclose 4 crucibles. The flame from the
compartment b may be led either all round the muffel into the chimney or below
the muffel direct into the chimney. Suitable dampers e el control the passago.
The temperature of the muffel may be controlled by removing the lid g.

page_text: In using these my improved melting furnaces the crucibles receive the final
beating previous to pouring, in the compartment a of the furnace nearest the
entrance of the flame. The crucibles in the further compartments 66' are receiving
a preliminary heating and will be shifted from the compartment b into a from the
compartment & into b. The crucibles are first placed into the compartnent b¹.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
A furnace for melting metals in crucibles which furnace is divided into two
three or more parts or compartments in which the crucibles charged with the metal
to be melted are placed successively so that they receive first a preliminary heating
in one or more compartments and then a final heating in another compartment.
Dated this 3rd day of July 1885.
CARPMAEL & Co.,
Agents for the Applicant. 1