IMPROVEMENTS IN DOORS FOR PUDDLING AND MILL FURNACES
Year: 1879

page_text: LETTERS PATENT to Noah Dunn, of Tipton, in the County of Stafford,
Ironfounder, for the Invention of "IMPROVEMENTS IN DOORS FOR PUDDLING
AND MILL FURNACES."
Sealed the 4th June 1880, in pursuance of an Order of the Lord Chancellor, and
dated the 15th November 1879
PROVISIONAL SPECIFICATION left by the said Noah Dunn at the Office of
the Commissioners of Patents on the 15th November 1879.
NOAH DUNN, of Tipton, in the County of Stafford, Ironfounder.
MENTS IN DOORS FOR PUDDLING AND MILL FURNACES.”
" IMPROVE-
The object of this Invention is by the means hereinafter mentioned so as to construct
puddling and mill furnace doors as to render them more durable than at present,
and its object is also at the same time so to confine the heat within the furnace as
to render the puddling or working of the iron a more easy process to the workmen
employed.
Furnace doors of the kind mentioned in the title as ordinarily constructed
have only an inside lining of fire brick, and thus when the furnace is at work
the iron plate of the door soon acquires an intense heat, and so speedily wears out.
This great heat so evolved also causes the men engaged to work under much difficulty.
According to my Invention I propose to so construct the furnace door as to leave
an open space or open spaces between the outer iron plate and an inner iron plate
or partition which I provide, so as to form a water chamber or water chambers.
On the other side of the said inner plate comes the usual course of fire brick.
A proper and sufficient supply of water is obtained by any well known means,
and in the same manner a constant circulation of the water is caused to take place,
so that the whole of the furnace door is thus kept either cool or at a very moderate
heat.
SPECIFICATION in pursuance of the conditions of the Letters Patent, and of
an Order of the Lord Chancellor, filed by the said Noah Dunn in the Great
Seal Patent Office on the 5th June 1880.
NOAH DUNN, of Tipton, in the County of Stafford, Ironfounder.
MENTS IN DOORS FOR PUDDLING AND MILL FURNACES."
" IMPROVE-
The object of this Invention is by the means hereinafter mentioned so to construct
puddling and mill furnace doors as to render them more durable than at present,
[Price 4d.1

page_text: and its object is also at the same time so to confine the heat within the furnace as
to render the puddling or working of the iron a more easy process to the workmen
employed.
Furnace doors of the kinds mentioned in the title as ordinarily constructed have
only an inside lining of fire brick, and thus when the furnace is at work the iron
plate of the door soon acquires an intense heat, and so speedily wears out. This
great heat so evolved also causes the men engaged to work under inuch difficulty.
According to my Invention I propose to so construct the furnace door as to leave
an open space or open spaces between the outer iron plate and an inner iron plate
or partition, which I provide so as to form a water chamber or water chambers.
On the other side of the said inner plate comes the usual course of fire brick.
A proper and sufficient supply of water is obtained by any well known means,
and in the same manner a constant circulation of the water is caused to take place,
so that the whole of the furnace door is thus kept either cool or at a very moderate
heat.
That my Invention may be fully understood I have annexed Drawings thereof,
which I will now proceed to describe.
Fig. I. is a longitudinal vertical section on the line A, B.
Fig. II. is a transverse vertical section on the line C, D; Fig. III. is a horizontal
section on the line E, F; Fig. IV. is a front elevation, Fig. V. an end elevation, and
Fig. VI. a plan of a furnace door constructed according to my Invention. Similar
letters of reference indicate the same parts in all the Figures.
a is the outer plate of the door, and b is the inner plate; d is a vertical division
having a space e below it; c is a firebrick lining occupying the remaining part of
the thickness of the door. Any well known means for supplying water to the
hollow spaces. between the said plates a and b of the said door may be adopted. I
will proceed to describe one method. f,f, are open slots in the top of the door,
through one of which passes the vertical supply pipe g; cold water therefrom fills
the hollow part of the door, and passing in the direction of the arrow in Fig. I.
escapes through the overflow pipe h into the vertical rectangular waste pipe i, which
has an open front above the line k for the purpose of allowing the pipe to rise and
fall when the door is being opened and closed; is the foreplate upon which the
door descends. By preference I make the said foreplate hollow, as shewn, and
allow the water from the waste pipe i to pass through it for cooling purposes, but I
do not claim any novelty in respect of the said water-cooled foreplate.
Having now described the nature of my Invention, and the manner in which the
same is or may be carried into effect, I desire it to be understood that without
limiting myself to the precise details herein before described, as these may be to
some extent varied or modified without departing from the nature of my said
Invention, I claim as the Invention to be protected by the herein before in part
recited Letters Patent, puddling furnace and mill doors having a hollow space or
spaces in front of the usual firebrick lining, through which hollow space or spaces
a circulation of water is maintained, as and for the purpose hereinbefore described
and as illustrated in the accompanying Drawings.
In witness whereof, I, the said Noah Dunn, have hereunto set my hand and
seal, this Third day of June, in the year of our Lord One thousand eight
hundred and eighty.
NOAH DUNN. (L.S.)