Improvements in Furnaces for Heating and Melting all kinds of Metals.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in Furnaces for Heating and Melting all kinds
of Metals.
WILLIAM MAYER, Morwell House, Oxhill Road, Dumbarton, Scotland, Foundry
Manager, do hereby declare the nature of this invention to be as follows:-
My improvements in furnaces for heating and melting all kinds of metals are shown
on the two drawings Figs. I & II, accompanying this form. The usual type of
furnaces, either large or small, can be constructed, or existing furnaces altered, in
accordance with said drawings. The internal part or flue space (A X, Fig. I) of the
furnace is tapered from the end of the fire space A along its entire length. An air
chamber, one of them marked B and the other marked C, is constructed on either
side of the fire space A, and both of them are supplied with air from the ash space, D,
Fig. II, through a passage controlled by two sliding shutters, oue marked E & the
other marked F. A circular orifice, on each side of the furnace at the top of the air
chambers, is made to admit the heated air from the said chambers into the furnace.
The furnace is fired at the end through a door G. The fire bars, H are extra, or triple
deep, so as to get heating surface for the purpose of heating the air which passes
through them. There is also an open oblong space I above the fire bars to admit air
direct to the fire.
Dated this Twenty fifth day of October One thousand eight hundred and
Improvements in Furnaces for Heating and Melting all kinds
of Metals.
WILLIAM MAYER, Morwell House, Oxhill Road, Dumbarton, Scotland, Foundry
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
My improvements in furnaces for heating and melting all kinds of metals are shown on
the drawings Figs. 1 2 3 4 and 5 sent herewith. Fig. 1 is an end view of the furnace
as it stands on the ground. A is an oblong firing door set between two deep external
brackets. BB are two sliding shutters working in the frames G G to control the
portway which admits air into the furnace and air chambers on each side of the fire
space. D is an oblong space or open portway for the purpose of admitting air to the
fire above the fire bars. E are the extra or very deep fire bars hanging down into the
ash space F. CC are the supporting legs or stools on which the furnace stands.

page_text: LLLL
Fig. 2 is a side view of the furnace as it stands on a cast iron bottom plate. H is an
oblong hole fitted with a cast iron door on hinges and used as a sight hole for the
purpose of examining and feeling the metal with an iron rod when it is melted. I is
the tap hole out of which the metal is tapped when ready, and J is the runner or
spout by which the molten metal runs down into a ladle set for the purpose of
receiving it. K shows the frame in which the sliding shutters B B work.
are the bolts, three through snugs on the top of the furnace casing and one through
the centre towards the bottom. M M are external flanges on the end of the furnace
binding it & the side together. C C C are the legs or stools on which the furnace
stands with the expansion rollers N, N, between them and the bottom plate O for
allowing the furnace to expand and contract. Fig. 3, is a section of Fig. 1,
through Y, Y, showing the tapering form of the outside frame, and the brickwork
forming the internal part of the furnace proper, from the fire end P to the flue end Q
where the furnace is connected to the chimney. R R are two portways controlled by
sliding shutters B, B, and S S are two air chambers having communication with the
portways. Air is admitted through the portways and simultaneously passes up through
the fire bars in at the bottom of the air chambers, which, when it becomes heated,
passes out in the direction of the portways & mixing with the air entering there,
forces it with greater velocity into the fire. The current of cold air entering the air
chambers assists to keep the cast iron frame of the furnace cool. The brick bridge or
bar T T between the space P and the well part U has a space V, left between the
bricks, which is filled up with fine dry sand, and prevents the molten metal from
getting through the joints of the brickwork into the fire P. Fig. 4 is a section of
Fig. 1, through X, X, and shows the vertical form of the furnace also the form and
positions of the fire space P, and the flue space Q. U, is the well part, T T the bridge
or bar with space V in it filled up with sand. W is the charging door, E is the extra
or very deep fire bars in the ash space F. A is the firing door and D the oblong
space or open portway. Fig. 5 is a plan of the top of the furnace showing the tie
bolts L LL, the charging door W with cover arrangement and the brick work forming
the cover or top of the furnace. The outer frame or casing of the furnace is made
with four cast iron plates-two end and two side plates-and bound together by
external flanges and bolts as shown on Fig. 2. The internal part of the furnace is
built and formed with fire bricks as shown on Figs. 3, 4 & 5 and to carry the said
brick work there is an internal flange cast on the side plates, and a cast iron partition
plate bolted to them, with an internal flange on which rests a flat cast iron bottom
plate to support the well part U. The brickwork, forming the fire space P, is built
on the top of the fire bars E, & is supported in its place by two bearing bars resting
on the internal flanges of the side plates. The furnace, thus made to the aforesaid
drawings and description is placed in a convenient position in order that the flue
space may be connected to a chimney or to another flue leading into a chimney to
get sufficient draught to ensure a thorough combustion of the coals with which the
furnace is fired. After the furnace is heated the metal is put in at the charging door
on the top & when it is melted is tapped out at the tapping door into a ladie.
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 :-
:―
1st. The tapered form of the furnace with the firing door on the end.
2. The air chambers and controlling sliding shutters.
3. The extra cr very deep fire bars with oblong space or portway above them.