Year: 1893

page_text: Date of Application, 30th May, 1893-Accepted, 1st July, 1893
castings, the principal advantages of which are as folOWS
1. A considerable economy in the consumption of fuel is obtained.
2. It is capable of general application.
3. It allows of a sure and rapid drying of the moulds being effected.
4. It can be easily regulated whereby the burning and deterioration of the moulds
by a too intense heat is prevented.
In order to enable the invention to be fully understood I will describe the same
by reference to the accompanying drawing, in which :-
Figure 1 is an end view partly in section of my improved apparatus :
Figure 2 is an elevation:
Figure 3 is a plan :
Figure 4 is a longitudinal section; and,
Figures 5 and 6 are horizontal sections on the lines X X and Y Y of Figure 4.
a is a casing of sheet metal lined with bricks provided with three openings a¹, a², a³
and with two suspension stirrups a, a, which latter serve for moving the apparatus
by means of a travelling crane. The casing a¹ is provided with a cover 6 having
four handles b', ', the said cover having an opening adapted to be closed by a hinged
flap 6, through which opening the apparatus is charged with fuel.
b
The furnace d, properly so called, comprises a hinged grid e, and an air-box e
adapted to the said grid and provided with a register e. Above the furnace is
arranged a cage h, formed of iron rods connected at both ends by two rings. The
rods comprising this cage h are covered or coated with refractory earth so that only
narrow passages are left between the bars.
a indicates the opening corresponding with an air-pipe bringing cold air from
a blower into the space g, between the casing a of the apparatus and the furnace
proper.
By shifting the register e³ by means of the handle e³, cold air can be allowed to
pass from the space g beneath the grid e. Further, air can pass from the space g
through the four openings i, i, i, i (supplementary or secondary entries) around the
furnace d into the upper space k, and there unite with the burned gases and hot air
issuing from the cage h before entering the chamber L and thence pass, according
to requirements, through the openings a, a, and the opening a formed in the
bottom plate of the apparatus into the moulds to be dried.
The secondary or supplementary supply of air is regulated by increasing or
diminishing the size of the openings i, i, i, i by the vertical movement of the
movable furnace d suspended by four pitch chains f, f passing over sprocket
wheels, capable of being simultaneously actuated by suitable gearing such as
worm and worm wheel gearing, as shewn in Figure 2.
The bottom plate of the apparatus is provided with an opening m through which
the furnace d can be lowered for cleaning the grid and the ash-pit. This cleaning
can also be effected through the opening a¹. The opening m is closed by a sheet
metal plate easily operated.
In the chamber L are three angular pieces n, n', n³ to conduct in a lateral direction
any solid bodies such for example as ciuders or small pieces of coke, etc.

page_text: The angular piece n is fixed and the two others n', n¹ are movable to alloy of
conducting away through the opening a² of the chamber L the cinders, ashes, etc.
which being deflected by the piece n accumulate in the angular parts n', n'.
The chamber L is provided with sight holes which allow of observing the flame
extending from the furnace d into this chamber
From the opening a¹ extends & pipe o, cpeuing at o' into the chamber L between
the vertical plates of the angular pieces n', n₁ so as to inject between the three
angular pieces n,, ' cold air into the hot air and thus still further purify the hot
gases serving for drying moulds, whereby moulds can be dried in such a manner as
to allow of the metal being run into them without it being necessary to take the
moulds apart after drying.
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 :-
1. In an apparatus for drying moulds for metal castings a movable furnace
suspended on chains and surmounted by a cage formed of iron bars or rods covered
or coated with refractory earth, the said furnace comprising a register to allow of
the passage of air through the grid of the furnace being regulated, the vertical
movement of the said furnace being utilized for regulating the secondary or supple-
mental admission of air around the furnace for regulating the temperature of the
mixture of hot gases furnished by the apparatus, substantially as hereinbefore
described.
2. In an apparatus for drying moulds constructing the casing of the apparatus
with a chamber L having sight holes for inspecting the spread of the fire, angular
pieces for retaining the ashes and cinders in the said chamber and means for
injecting a current of cold air between the three angular pieces for completing the
purification of the gases furnished by the apparatus, substantially as hereinbefore
described.
3. The improved apparatus for drying moulds for casting purposes hereinbefore
described and illustrated in the several figures of the accompanying drawings.
Dated this 29th day of May 1893.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.