Improvements in Sheet Metal Heating Furnaces.
Year: 1895

page_text: Date of Application, 14th May, 1895-Accepted, 22nd June, 1895
COMPLETE SPECIFICATION.
Improvements in Sheet Metal Heating Furnaces.
I, WILLIAM EDWIN HARRIS, of Nilce, in the County of Trumbull, in the
State of Ohno, one of the United States of America, Metal Worker, do hereby
declare the nature of thus invention and in what inanner the same is to be performed
to be particularly described and ascertained in and by the following statement,
reference being had to the accompanying drawings, forming part of this Specification
and to the figuies and letters marked thereou that is to say :-
My invention relates to a heating furnace, designed to be employed in keeping
sheet iron or other metal a nearly unifon heated condition during the process
of olling, whereby avoid the usual constant cooling and reheating incident.
in the ordinary practice of rolling, which constant cooling and reheating is very
detimental to the quality of the sheet non, and results in a very considerable loss in
time and labor in the work, and my invention consists m features of novelty
hereinafter fully shown and descubed and pointed out in the claims
Figme Is a top view of the furnace with the cover removed.
Figure II is a vertical longitudinal section through the central portion of the
furnace.
Figure is a vertical transverse section taken on lue I-III, Figure II.
Figure IV is a vertical transverse section taken on line IV-IV Figure 11.
Figure Villustrates a device for heating the iolle.
Referring to the drawings 1 represents the base of the furnace, provided with
wheels 2, that travel upon a trach 3.
ก
4 represents the body of the furnace, within which is mounted a giate 5. The
outside casing of the body 4 is preferably constructed with a metal covering 6 that
encloses a fire proof wall 7, and at the sides of the furnace is a supplemental file-
proof wall 8 located at a short distance from the outside wall to leave an inter-
vening chamber In the supplemental wall 8 mic perforations 10 provided for
the purpose of allowing the ingress of gas, whon gas is the fuel employed in the
furnace in place of other fuel burned upon the grate.
Pivotted in the side walls of the furnace is a frame 11, which supports piping 12
that extends by bends and return bends to points near the ends of the furnace, and
It is upon this piping that the sheet of non is supported in the furnace, as will
hereafter be fully explamed.
Connected to the ends of the piping outside of the furnace are hose of pipes 13
provided for the ingress and egiess of a continuous supply of water through the
piping 12 to keep the piping at a low temperature to prevent warping of the piping
and the frame 11 by the heat, which would result without the introduction of some
Cooling agent
The frame 11 is constructed with the pivots in order that it may
be tilted in receiving the sheet non from the rolls, and tilted in otun when it is
desired to remove the sheet iron from the furnace, as will be presently explained in
reciting the operation of this part of the fornace Secured to the frame 11 or to
the ends of the piping 18 a level 14, moving in a guide 15, through the medium of
winch lever the tame and piping may be tilted as desired.
lu the end of the furnace, at which the rolls A, B, are located, is a door 16,
pivotted at its central portion upon a rod 17, the construction being such that the
lower side of the door is adapted to swing inward, and the upper side is adapted to
Swing outward. so that the sheet of iron may be readily passed into the furnace
at the lower side of the door way, and out of the furnace at the upper side

page_text: In rolling a sheet of 11on, when it has been passed through the rolls, the frame 11
is tilted into the position shown by dotted lines in Figure II, and the door 16 is
tilted as shown by dotted lines in the same figure, to allow the passage of the
sheet C, (shown in Figure II between the rolls and in dotted lines in its passage)
into the furnace and onto the piping 12, when the frame 11 1s, by means of the
lever 14, tilted back to its normal position, and the sheet after remaining the
desired length of time in the furnace, is passed out through the upper portion
of the doorway over the roll A, from which it is taken by the operator and again
presented to pass through the rolls and into the heating furnace as before, this
process being repeated until the sheet has reached the desired reduction.
Located the opposite end of the furnace from that in which the door 16 is
located, is a pair of doors 18 provided for the introduction of fuel to the furnace,
and for the introduction of the tongs or other tool used to grasp the end of the
sheet iron as it comes from the rolls into the furnace and to pass it out from the
upper portion of the doorway over the roll A.
At the sides of the furnace, mounted on the supplemental walls 8, are shelves 19
upon which the sheet irou may be laid to keep it in a heated condition when it is
desired to roll a number of sheets into one, the sheets already rolled being bent
over with one end upon the other and land on the shelves on edge until another
sheet or other sheets are rolled down to a desned thickness, when they are all
placed together and passed from the furnace to be rolled into one
20 represents the cover of the furnace seated in a groove 21 and which 18
provided with a hook 22 by which the said cover may be arsed a ben it is desired
for any reason to get at the interior of the furnace from above At one end
of the cover 19 a chamber 23 providing communication from one side of the
furnace to the other, the openings 24 in which chamber register with passage
ways 25 that are in duect communication with the chambers 9 Connected to the
chamber 23 are pipes 26 through which a supply of gas may enter the chamber 23
and pass into the passage ways and thence through the openings 10 into the
interior of the furnace, where upon being lighted, jets of flame are projected to
heat the furnace in place of the employment of roke or other fuel, upon the
grate 5
29 represents Hues connected to the sides of the furnace for the purpose of
carrying of the smoke and gases from the furnace, which flues are carried down
and connected to a main flue 27, that may he connected with a number of adjacent
furnaces, so that one main flue answers to carry the unconsumed products from
any number of furnaces in use in near proximity to each other
•
28 represents ash pit doors provided to allow of the removal of ashes from the
furnace.
It 15 a well known fact that where rolls in a rolling mill are allowed to become
cold, there is a very material loss of time in getting them hot again and consequent
waste of many sheets of metal until the rolls do become hot. To avoid this
loss of time and waste of material have adopted the device illustrated in
Figure V
It consists in a pipe 30 formed with return bends and provided at one of its ends
with a cross pipe 31, having a series of jet openings 32 The opposite end of the
pipe is open and is arranged for the attachment of a blower. In the use of this
part of my invention, I place the main body of the pipe 30 in the heating furnace,
and allow the cross pipe 31 to rest in a position close to the rolls. The opposite
end of the pipe passes out at the other end, or a side of the furnace, and there
receives the blower. In this position the main body of the pipe becomes heated,
and I then, by means of the blower, foice an through the pipe, which air in its
passage becomes highly heated and then passes out through the jet openings 32 to
heat the rolls
When the rolls have become thoonghly heated, I remove the pipe from the
furnace and rolls until such time as the rolls again become chilled and requie to
be heated.

page_text: I have spoken of cold water as the medium employed to cool the piping 12 and
prevent its warping, but it is evident that other mediums might be employed in
len of water, such, for instance, as a blast of cold air.
In place of coal, coke, or gas to heat the furnace, oil may be used with the most
antisfactory results.
My furnace is adaptable for use in rolling all kinds of metals, its use not being
limited to rolling sheet non. It is especially adaptable in the rolling of aluminum
which it is very necessary should be kept at a uniform heat in the process of
rolling.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim 18.
1. In a furnace, the combination of the walls, a frame pivotted in said walls'
piping mounted on said frame, and flexible water connections on the ends of said
Piping arranged to provide ingress and egress of water and allow a rocking
movement of said piping, substantially as described
2 In a furnace, the combination of an outer wall, an inner supplemental wall, a
chamber between said walls, perforations in said supplemental wall, furnace cover, a
chamber located in said cover, gas supply pipes communicating with said chamber,
and passages leading tiom said last mentioned chamber to the chamber between the
walls, substantially as described.
3. In a furnace, the combination of an outer wall, an inner supplemental wall, a
chamber between said walls perforations in said supplemental wall, a removable
furnace cover, a chamber located in said cover, gas supply pipes communicating
with said chamber, and passages leading from said last mentioned chamber to the
chamber between the walls, substantially as described.
4. In a furnace the combination of a pivotted frame mounted in the wall of said
furnace, shelves mounted against the walls of the furnace, piping mounted on said
pivotted frame, and a flexible water supply connection attached to the ends of
said piping, substantially as described.
5. In a furnace, the combination of a pivotted frame mounted in the wall of said
furnace, piping mounted on said pivotted frame, water supply connection attached
to said piping, and a door 16 in the wall of the furnace mounted on a central
pivot 17, substantially as described
6. In a furunce, the combination of a pivotted frame mounted in the wall of the
furnace, piping mounted on said frame, water supply connection attached to said
piping, a lever aanged to operate said pivotted frame, and doors 16 and 18 at
either end of the furnace, substantially as described.
7. A device for heating rolls, consisting of a pipe artanged to be partly placed
in a furnace, a cross pipe provided with jet openings at one end of said pipe, and
the opposite end of said pipe arranged to receive the attachment of a blower;
substantially as descubed.
Dated this 14th day of May 1895.
WHITE & WOODINGTON,
27 Southampton Buildings, London, Agents.