Improvements in and relating to Furnaces for Heating Metal.
Year: 1896

page_text: Date of Application, 3rd Mar., 1896-Accepted, 16th May, 1896
COMPLETE SPECIFICATION.
Improvements in and relating to Furnaces for Heating Metal.
I, WILLIAM HENRY BAILEY, a citizen of the United States of America,
residing at Piqua, in the County of Miami, and State of Ohio, one of the United
States of America, Metal Founder, 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 invention relates to certain new and useful improvements in furnaces for
heating metal, and it consists of a furnace provided with two heating chambers
which communicate with each other by means of suitable flues, having arranged
therein suitable dampers, whereby heat may be directed from one chamber to the
other, as may be desired.
Heretofore it has been necessary to employ two furnaces for that class of mills
commonly called "sheet mills" and "tin mills," one to heat the metal bars or
billets before being rolled into sheets, previous to being rolled to proper gage and
finish,
It is the object of this invention to produce a single furnace in which both of the
beating operations can be performed, utilizing the waste heat from one chamber of
the furnace to the other and economizing space, as a single furnace can be made
much more conpact than two separate furnaces. Moreover a single furnace can
be managed with much less labor than two separate furnaces, which tends to
economizing the manufacture of metallic sheet.
This object is attained by means of the structure illustrated in the accompanying
drawings, in which--
Figure 1 represents a side elevation of my improved furnace; Figure 2, a front
elevation of the same; Figure 3, a transverse vertical section on line 3-3 of
Figure 1; Figure 4, a longitudinal vertical section, and Figure 5, a transverse
vertical section on line 5-5 of Figure 4.
Referring to the drawings-
The numeral 1 indicates the walls of the furnace, which are constructed of brick-
work braced and held together by the vertical T-shape or angle irons 2 and the
brace-rods 3.
The numeral 4 indicates the fire or combustion chamber of the furnace, and 5 a
bridge-wall built up from the floor, forming the front of the fire-chamber and
dividing the same from a heating chamber 6, which I will designate as the pair-
heating chamber. This chamber is situated immediately in front of said fire
chamber, and has an elevated hearth 7, built up of brick-work from the floor, to
form a support for the metal bars or billets which are to be heated in said chamber.
The mumeral 8 indicates a bridge-wall constructed of brick-work, and extending
from the foundation of the furnace to near the upper part thereof, terminating
below the top of the chamber to form a passage way 9, between its upper edge and
the roof, which leads into a second heating-chamber, 10, which will hereinafter be
referred to as the sheet-heating chamber. The roof of the furnace is arched from
front to rear, as shown in Figures 3, 4 and 5, and the sheet-heating chamber is
formed with an arched bridge 11, which extends a short distance from the bridge-
wall 8, forming a continuation of the passage-way 9. The front wall of this
chamber, which is also the front wall of the furnace, is constructed of brick-work
and has built upon it the smoke-stack 12, which is cylindrical in cross-section and

page_text: lined with fire-brick. The stack is supported upon a flanged iron collar, 13, which
rests проп iron girders 14 supported by brick-work of the furnace.
In the center of the arched roof of the furnace, nt a point near the forward part
of the pair-heating chamber, is an exit 15, communicating with a flue 16, which
extends to and enters the smoke-stack at its base. This flue is provided with a
damper 17, controlling the escape of the products of combustion and regulating the
draft of the furnace, and also for directing the hent from the pair-henting chamber
into the sheet-heating chamber.
Each side wall of the sheet-heating chamber is provided with an exit, 18, which
communicates with a flue, 19, extending upwardly through said side-walls and the
arched roof and communicating with the smoke flue 16. These flues are provided
with dampers 20 and 21 for controlling and regulating the heat in the sheet-heating
chamber, and also for controlling the escape of the products of combustion.
The combustion-chamber is provided with the usual door 22 for firing, and the
pair heating chamber with a door, 23, for charging and removal purposes both doors
being preferably at one side of the furnace.
The sheet-henting chamber is provided with an inclined bottom, 24, inclining
from front to rear, and doors 25 are provided at the front for the insertion and
removal of the metal sheets.
The operation of the invention is as follows:-
The bars or billets of metal, which require a high temperature for working, are
placed into the pair-heating chamber and heated in the usual manner. After being
properly heated the bars or billets are removed from the chamber and supplied in
pairs to the rolls, when they are rolled into blanks or sheets of any suitable size.
These blanks or sheets are then placed in the sheet-heating chamber and re-heated
for further rolling and finishing.
The air-heating chamber is of the usual construction employed in rolling mills,
but the heat which in this class of furnaces, passes up through the flue with the
products of combustion, is utilized for heating the sheets, thereby effecting a great
saving in fuel.
In starting, when a high degree of heat is required for heating the bars or billets
of metal, the products of combustion may be allowed to pass directly to the smoke-
stack, afterwards when good combustion is obtained, the heat is directed through
the passage-way 9 into the sheet-heating chamber to heat the sheets, the degree of
heat in both chambers being regulated and controlled by the dampers.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what mauner the same is to be performed, I declare that what I
claim, is:-
1. A furnace for heating metals, comprising a single fire-chamber, a pair-heating
chamber and a sheet-heating chamber, the fire-chamber connected with the pair-
heating chamber by a passage-way above the division wall, and the pair-heating
chamber connected with the sheet-heating chamber also by a passage-way, a smoke
stack separate from the several chambers but connected with the sheet-heating
chamber by damper-controlled flues leading through the side walls of said chamber,
and flues connecting the pair-heating chamber with the smoke-stack and controlled
by dampers, whereby the products of combustion may be directed through said
pair-heating chamber or through the sheet-henting chamber, as desired.
2. A furnace for henting metals, comprising a fire-chamber, a pair-heating chamber,
and a sheet-heating chamber, the pair-heating chamber partially separated from
the fire-chamber by a low wall, the sheet-heating chamber separated from the pair-
heating chamber by a wall having an arched bridge extending therefrom into said
sheet-heating chamber, and a passage way above said wall and bridge connecting
the two chambers together, a smoke-stack separated from the several chambers, a
flue leading from the pair-chamber through the crown of the furnace to the smoke-
stack, fines leading from the sheet heating chamber through the side walls of said
smoke-stack, and dampers located in said flues, whereby the heat and products of

page_text: combustion may be directed through first one heating-chamber and then the other,.
substantially as specified.
Dated this Third day of March 1896.
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.