Improvements in and relating to Casting.
Year: 1889

page_text: Date of Application, 16th Dec., 1889
Complete Specification Left. 7th Mar., 1890-Accepted, 10th Apr., 1890
PROVISIONAL SPECIFICATION.
Improvements in and relating to Casting.
I EDUARD TAUSSIG of Bahrenfeld in the Empire of Germany, Factory Manager
do hereby declare the nature of this invention to be as follows:-
The object of this invention is to provide for the casting of objects with a smooth
non oxydised surface and to avoid the disadvantages arising from the admission of
air during the melting and conveyance of the molten material to the casting apparatus
and moulds.
To this end the melting of the material and the casting is to be performed in a
rarefied atmosphere.
This may be attained by melting the material in an electric furnace which is placed
in the same chamber with the mould or moulds the air in the said chamber being
rarefied by means of air pumps or other known devices.
The conducting wires for leading the electric current to the furnace may be passed
through stuffing boxes in the walls of the chamber or may be fastened in the said walls
with solder.
As the transfer of the molten material to the moulds must take place also within
said chamber the transfer may be controlled by a cock or other shut off device to be
operated from outside without air entering the chamber. This may be effected by a
rod passing through a stuffing box in the wall of the chamber or by the closing of
an. electric circuit operating electro magnets.
Dated this 16th day of December 1889.
HERBERT & Co.,
Agents to Applicant.
COMPLETE SPECIFICATION.
Improvements in and relating to Casting.
I, EDUARD TAUSSIG, of Bahrenfeld, in the Empire of Germany, Factory Manager,
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:—
The object of this invention is to provide for the casting of objects with a smooth
non-oxydized surface, and to avoid the disadvantages arising from the admission of
air during the melting and conveyance of the molten material to the casting apparatus
and moulds.
To this end the melting of the material and the casting is to be performed in a
rarefied atmosphere.
This may be attained by melting the material in an electric furnace which is placed
in the same chamber with the mould or moulds, the air in the said chamber being
rarefied by means of air pumps or other known devices.
The conducting wires for leading the electric current to the furnace may be passed
through stuffing-boxes in the walls of the chamber or may be fastened in the said
walls with solder.
As the transfer of the molten material to the moulds must take place also within
said chamber, the transfer may be controlled by a cock or other shut off device to be
operated from outside without air entering the chamber. This may be effected by a
rod passing through a stuffing-box in the wall of chamber or by the closing of an
electric circuit operating electro-magnets.
In the accompanying drawing Figure 1 is a vertical section through the apparatus.
Figure 2 is a plan view of the crucible and of some of the moulds.

page_text: A is the chamber within which the melting and casting is to take place; the space
within it is brought into connection with the air-pump by means of the pipe m.
Bis
the crucible of an electric melting apparatus of Siemens' system; C are the moulding
boxes, into which the molten metal is cast.
The chamber A is provided with openings which may be tightly closed, for intro-
ducing or removing the crucible and the moulding boxes; it is also provided with
the windows r r through which the melting and casting processes may be watched.
e is a metal-plug covered with clay, which, as soon as the casting has to commence,
may be withdrawn from without from the crucible by means of the rod p passing
through a stuffing-box. The negative carbon-rod K, which with the furnace of
Siemens is suspended on a balance-lever wand is movable, may be inserted
likewise with its suspension-wire or band z, through a stuffing-box in the wall of
the chamber. i and are the negative and positive connecting wires leading to the
dynamo-machine.
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 :-
The method of melting and casting metal in a rarefied atmosphere consisting in
arranging an electric melting-furnace of suitable construction, with the casting
apparatus and moulding-boxes in a chamber within which the air may be suitably
rarefied during the melting and casting with means for controlling said parts from
outside the chamber without disturbing the atmospheric pressure in said chamber.
Dated this 7th day of March 1890.
HERBERT & Co.,
18, Buckingham Street, Strand, W.C., London, Agents to Applicant.