IMPROVEMENTS IN CONDENSING OR COMPRESSING MOLTEN METALS AND APPARATUS THEREFOR."
Year: 1880

page_text: LETTERS PATENT to Alfred Davis, of No. 5, Westminster Chambers, in the
County of Middlesex, for an Invention of "IMPROVEMENTS IN CONDENSING
OR COMPRESSING MOLTEN METALS AND APPARATUS THEREFOR."
PROVISIONAL SPECIFICATION left by the said Alfred Davis at the Office
of the Commissioners of Patents on the 22nd January 1880.
ALFRED DAVIS, of No. 5, Westminster Chambers, in the County of Middlesex.
"IMPROVEMENTS IN CONDENSING OR COMPRESSING MOLTEN METALS AND APPARATUS
THEREFOR."
In the Specification to Letters Patent granted to W. R. Lake on the 10th
January 1877, No. 129, were described a process and apparatus for effecting the
compression or condensation of ingots while casting them, by subjecting the molten
metal to the pressure of live steam. My Invention relates to means of effecting
the condensation or compression of ingots or other castings in steel, iron, or other
metal, by subjecting them while in a molten state in their moulds to the pressure
of compressed air or other elastic gas admitted to the moulds from a reservoir in
which the air or gas is contained or generated under high pressure. For this
purpose I cover the ingot or other mould with an airtight cover secured firmly
thereto, so as to resist high internal pressure, and I connect the said cover or the
upper part of the mould with the air or gas reservoir by a pipe furnished with a
stop cock or valve, which, when the metal has been poured into the mould, is
opened so as to subject the metal to the pressure of the fluid in the reservoir.
This pressure may be increased by quickly closing the cock or valve, and allowing
the air or gas admitted to the mould to remain subject to the heat of the metal
therein. The air or gas may be compressed into the reservoir by pumping, or gas
may be generated at high pressure therein by chemical reactions, or by the ignition
of explosives.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Alfred Davis in the Great Seal Patent Office on the 19th July 1880.
ALFRED DAVIS, of No. 5, Westminster Chambers, in the County of Middlesex.
"IMPROVEMENTS IN CONDENSING OR COMPRESSING MOLTEN METALS AND APPARATUS
THEREFOR."
In the Specification to Letters Patent granted to W. R. Lake on the 10th
January 1877, No. 129, were described a process and apparatus for effecting the

page_text: compression or condensation of ingots while casting them by subjecting the molten
metal to the pressure of live steam.
My Invention relates to means of effecting the condensation or compression of
ingots or other castings in steel, iron, or other metal, by subjecting them while in a
molten state in their moulds to the pressure of compressed air or other elastic gas
admitted to the moulds from a reservoir in which the air or gas is contained or
generated under high pressure; for this purpose I cover the ingot or other mould
with an air tight cover secured firmly thereto, so as to resist high internal pressure,
and I connect the said cover or the upper part of the mould with the air or gas
reservoir by a pipe furnished with a stop cock or valve, which, when the metal has
been poured into the mould, is opened so as to subject the metal to the pressure of
the fluid in the reservoir. This pressure may be increased by quickly closing the
cock or valve, and allowing the air or gas admitted to the mould to remain subject
to the heat of the metal therein. The air or gas may be compressed into the
reservoir by pumping, or gas may be generated at high pressure therein by
chemical re-actions, or by the ignition of explosives.
The accompanying Drawings represent a convenient arrangement for the
application of my Invention to a number of ingot moulds; Fig. 1 being a plan
shewing three of such moulds arranged side by side, and Fig. 2 being an elevation
partly in section of one of them. A is the mould held firmly down to its base B,
and provided with a cover C which is tightly secured on the mould. D is a pipe
connected with a reservoir of compressed air or gas, and having for each mould
which it passes in its course a branch pipe E furnished with a suitable valve or
cock F. The branch pipe E is twisted in several convolutions so as to allow of
expansion or contraction without straining its joints. It is connected to the cover
C of the mould or to the top of the mould, and for convenience of use when it is
attached to the removeable cover it may be connected to the main pipe D by a
packed trunnion joint, so that it can be turned down along with the cover, as
indicated by the dotted lines E¹, into a recess in the floor which may be covered by
a plate G. The pipe D being supplied with air or other gas at the required
pressure, the mould is filled, and has its cover secured on it; and the cock or valve
F being opened, the fluid contents of the mould are subjected to the pressure of the
air or gas. By immediately closing the cock or valve F, the air or gas which is at
first admitted to the mould has its pressure increased by the heat. When the
mould has to be discharged, the cock or valve F being closed, the mould is taken
off the ingot in the usual way.
Having thus described the nature of my said Invention, and in what manner the
same is to be performed, I claim,-
Subjecting molten metal in a closed mould to the pressure of air or other gaseous
fluid by connecting the cover or upper part of the mould with a pipe communicating
⚫ with a reservoir containing the gaseous fluid under pressure, substantially as herein
described.
In witness whereof, I, the said Alfred Davis, have hereunto set my hand and
seal, this Fifteenth day of July, in the year of our Lord One thousand