An Improved Air-heating Furnace for Drying Casting Boxes or Moulds.
Year: 1899

page_text: Date of Application, 10th Oct., 1899-Accepted, 9th Dec., 1899
COMPLETE SPECIFICATION.
An Improved Air-heating Furnace for Drying Casting Boxes or
Moulds.
We, JEAN BACHMANN and MICHAEL CARACRISTI, Inventors, 224, St. Gallerstrasse,
Goldach, Switzerland, 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 air-heating furnace for use in drying casting
boxes or moulds. The furnace, owing to its oval shape, is exceedingly simple in
its internal construction.
By way of example a mode of carrying out the invention is shown on the
annexed drawing, whereon,
Fig. 1 is a side elevation of the furnace.
Fig. 2 is a longitudinal vertical section of the same.
Fig. 3 is a vertical section on the line X-X Fig. 2. The view is to an
enlarged scale and is taken with the oven lying on its side.
Fig. 4 is a plan view of the furnace.
Fig. 5 is a horizontal section of the same.
Fig. 6 shows the direction in which the air to be heated has to travel.
Fig. 7 is a part longitudinal section showing the cover or lid of the furnace.
Figs. 6 and 7 are drawn to an enlarged scale.
In an oval casing a, made of sheet iron and the inside of which is lined with
a refractory substance, is a transverse partition c which terminates at a short
distance from the cover or lid 6 and thus divides the furnace into two com-
partments 1 and 2. The compartment 1 has a grating k at its bottom upon which
the fuel is laid and which latter receives the air necessary to maintain combustion
from the inlet h into which air is forced by means of a fan (not shown) operating
in any usual and well known manner at the outside of the furnace. At the
bottom of the compartment 2 is a hot air outlet pipe gl which, at its lower end
is inserted in the connection g and whose upper end is covered by an inclined
shield d, made of sheet iron, and upon which the ash dust carried along with
hot air falls and is thereby prevented from entering the outlet g¹. The ash
and dust collecting in the bottom of the compartment 2 can be withdrawn through
the passage m which is provided with a suitable tight cover or door.
The oval casing a has a hollow lid or top b which is made with an opening f¹,
closed by a cover f, through which fuel can be introduced into the compartment 1.
This hollow top (see Figs. 6 and 7) is for the purpose of heating the cold air
which enters by the inlet h and passes up the passage n from whence, owing to the
peculiar construction of the lid, as shown, it is forced to follow a circular path
round about the opening f¹ of the lid before it reaches the passages e in the box z,
arranged across the upper part of the fire, where the air is highly heated before
passing into the compartment 2 from whence it travels to the pipe g¹ and through
the connection 9 (which latter is placed upon the mould to be dried) into the
mould.

page_text: The inlet is provided with a valve i for the purpose of regulating the amount
of air admitted to the air-heating passages and also to the grating k. An eye-hole
or window y is arranged in the side of the casing for the purpose of watching the
fire the condition of which can be ascertained by observing the flame and hot
gases passing over the top of the transverse partition c.
Z is a door in the casing and through which clinkers can be withdrawn from
the fire. o o are handles by means of which the furnace can be carried about
from place to place.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to performed, we declare that what
we consider novel and desire to claim is:-
An air-heating furnace for use in drying moulds or boxes used when casting
metals characterized by an oval casing which is divided by means of a partition
into two compartments one constituting a combustion chamber and the other a
chamber wherein the solid materials carried along with the hot air are collected
and also by a hollow lid or top in which the entering air can be heated before
it. comes in contact with the fire, substantially as herein before described with
reference to the drawings annexed.
Dated this 9th day of October 1899
H. D. FITZPATRICK,
100, Wellington Street, Glasgow, Agent.