A Means or Apparatus for Producing Pure Castings.
Year: 1894

page_text: COMPLETE SPECIFICATION.
A Means or Apparatus for Producing Pure Castings.
We HERMANN RICHARD MÜLLER and FRANZ OTTO MÜLLER of Löbtan
near Dresden in the Kingdom of Saxony, German Empire, Moulders, 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 an apparatus comprising an inlet and a collector.
which on account of its peculiar arrangement separates and retains all mechanical
impurities such as slag etc. from the liquid metal so that no portion of it can gain
access to the mould. The accompanying drawings show the new apparatus,
Fig. 1 being a front view and Fig. 2 a plan of the same. Fig. 3 is a mould
provided with the new cleaning devices. The cleaning devices consist of three
chief parts that is to say-
(1) The inlet proper a' which leads to the recess a, in the lower mould box B.
(2) The collector 6', the conical part 6 of which is arranged over the receptacle b
in the lower mould box.
(3) The movable inlet channel c from which start the channels leading to the
mould in the lower box.
a and b are connected together by the channel a². c¹ are core marks and serve
to fix the core piece . In consequence of this arrangement the molten metal runs
from the lowermost part of the receptacle into the channel c, and thence over into
the mould, while the slag and other light matter contained in the liquid metal collected
in the receptacle 6, finds sufficient room in the collector b', to become separated
therein from such molten metal.
By using the new cleaning devices the following advantages which are of the
highest importance for foundry purposes are obtained, that is to say.
(a) It will henceforth be unnecessary to cast objects in a standing, that is in a
vertical position, which was hitherto indispensable in order to obtain pure castings
for pipes cylinders etc. All these parts can be cast in a laying down, that is
horizontal position according to the new cleaning process as the separation
of the slag from the metal unavoidably follows before its entrance into the
mould.
(b) The objects can be cast as desired as it will not now be necessary to displace
the working sides downwardly.
(c) It will likewise now not be necessary to let the ladle containing the molten
iron rest some time before casting in order to allow the slag to separate in the said
ladle.
(d) No special care will be required for the purification of the metal that is the
retaining of the slag in the ladle by means of suitable tools.
The conical part placed in the upper mould box efficiently takes up the
irou rising in the collector after the filling of the mould and facilitates the
separation of the slag from the metal on account of the eddying taking place in
that part.
The part c is secured to b in such a manner as to be able to turn relatively
thereto and assume the most suitable position required for the scraping according
to the shape of the pattern. Moreover the arrangement of this movable part c, has
the essential advantage that according to the angle at which the latter is turned
the entrance of the molten metal under the core c³, and into the channel c, can be
retarded or throttled, as obviously on the metal entering the channel c, it will meet
with the least amount of resistance as soon (as shown in Fig. 2) as c is in a line

page_text: with the channel a', whereas when c forms an acute angle with a² the metal'
meets with more resistance as it issues from the receptacle 6 and will not pass
through the latter so rapidly as in the former case. The longer the metal remains
in the receptacle b, the longer time has the slag for separating from the metal and
the foundry operative will have to displace the part c, according to the purity required
for the casting. In the moulds a, a, b and c are in the lower mould box, and a¹ b'
and 6 in the upper mould box.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. A device or means for obtaining a pure casting characterized by a receptacle b,
over which is arranged a collector 6, the lower part of which tapers sharply
upwards, and from the lower part of which the metal is conveyed into the
channel c, leading to the mould, in such a manner that all light component
parts such as slag etc. are retained in such receptacle and gathered up in the
collector.
2. In the means above claimed the movable connection of the channel c leading
to the mould with the receptacle 6 for the purpose of undertaking the scraping or
cutting in a convenient manner and of retarding the passage of the molten metal
through the receptacle.
Dated this 14th day of June 1894.
J. B. FLEURET,
235, High Holborn, W.C., Agent for the Applicants.