Improvements in Ore Roasting Furnaces.
Year: 1898

page_text: Improvements in Ore Roasting Furnaces.
I, RICHARD RAINSFORD, of 20, Bucklersbury, in the County of Loudon,
Draughtsman, do hereby declare the nature of this invention (a communication
to me from abroad by L. D. Godshall, of Everett, in the State of Washington,
U.S.A., Inventor) to be as follows:-
-
This invention has for its object the provision of better means for protecting
the working parts of the agitators from the heat and ore in that class of ore
roasting furnace in which the agitators are mounted on a shaft passing through
the opposite walls of the furnace, and which walls are liable to settle, crumble,
make the openings for the shafts uneven and, in some cases, close them entirely.
By this invention a bracket is attached to each of the opposite walls, and slopes
downwardly; being protected on its upper surface from the heat by fire-clay or
the like. A vertical wall is built parallel with the edge of the brackets to a
height which allows just sufficient space for the horizontally arranged shaft,
carrying the agitators, to travel between it and the edge of the bracket. The
shaft is supported at the rear of the walls by wheels running on rails resting
on the hearth.
1
n
. 1000
R. RAINSFORD,
Applicant.
Improvements in Ore Roasting Furnaces.
I, RICHARD RAINSFORD, late of 20, Bucklersbury, but now of 1, Church Court,
Old Jewry, in the City and County of London, Draughtsman, do hereby declare
the nature of this invention (a communication to me from abroad by Lincoln D.
Godshall, of Everett, State of Washington, U.S.A., Inventor) and in what
manner the same is to be performed to be particularly described and ascertained
in and by the following statement:-
This invention relates to calcining and ore-roasting furnaces which are pro-

page_text: vided with slots or housings for protecting the carriages and adjunctive parts of
the stirrers from the heat and fumes. In this class of furnace the slots or
housings are so formed as to admit of the arms of the stirrers or rakes moving
freely when stirring or advancing the ores over the hearth. By attaching the
upper walls forming the slot to the roof or arch, the latter, in the ordinary course
of wear and tear, frequently settles, thereby closing the slots through which the
arms of the rakes or stirrers operate, and crippling the stirring or agitating
mechanism.
It is the purpose of the present invention to attach the upper walls forming
the slot to the side walls of the furnace which are immovable, heavy, and therefore
better adapted for supporting their weight. Under this arrangement any settling
or spreading of the arch will not have any effect on the utility of the slot.
The improvement will be described at length hereinafter and particularly,
claimed, and is illustrated in the accompanying drawing, which is a transverse
section of a furnace of ordinary construction, showing the application of the
invention.
The side walls 1, roof or arch 2, hearth 3, and stirrers or agitators 4 are of
common construction and are shown to illustrate the application of the invention
which latter consists in the special means resorted to for providing the upper
walls of the side slots or housings and attaching them to the side walls of the
furnace. Vertical walls 5 extend parallel with the side walls 1 and are located
a short distance therefrom and are supported upon the hearth 3, and these walls
may be of firebrick or other refractory material. Brackets are bolted to the said
walls 1 of the furnace, and consist of vertical members 6 and inwardly and down-
wardly inclined members 7, which terminate in ledges 8 to support the fire-
bricks or refractory material 9 placed thereon. The vertical members are
placed against the inner sides of the walls 1 and are bolted thereto, as clearly
indicated, and the inclined members 7 terminate at a point directly above the
vertical walls 5, a space being formed between the opposing portions of the upper
and lower walls for the passage of the arms of the rakes or stirrers 4.
The parts 7
and 9 constitute the upper walls, which, being inwardly and downwardly
inclined from the walls 1, prevent the lodgement thereon of ore or other matter.
The refractory material 9 protects the part 7 from the heat and fumes which is
essential, as the bracket is preferably constructed of iron, either cast or wrought.
The spaces enclosed by the upper and lower walls constitute the slots or housings,
which receive the carriages of the rakes or stirrers and the parts co-operating
therewith, so as to protect them from the action of the heat and fumes. The
carriages travel upon rails 10, placed upon the hearth and located within the slots
or side housings.
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 a furnace for calcining or roasting ores and provided with slots or
housings for enclosing the carriages and adjunctive parts of the stirrers, the com-
bination of lower walls rising from the hearth and extending parallel with the
side walls of the furnace, and upper walls secured to the side walls of the furnace
and extending inwardly and downwardly and terminating a short distance from
the said vertical walls, substantially as and for the purpose set forth.
2. In a calcining or roasting furnace, the combination of vertical walls placed
upon the hearth a short distance from the said walls, and brackets secured to the
side walls of the furnace and having inwardly and downwardly inclined members
or portions which terminate a short distance above the top edges of the vertical
walls substantially as and for the purpose specified.
3. In a calcining or roasting furnace, the combination of lower walls placed
upon the hearth a short distance from the side walls, brackets secured to the

page_text: said side walls and having inwardly and downwardly inclined members
terminating in upwardly-extending ledges, and refractory material placed upon
the said inclined portions of the brackets, substantially as and for the purpose
described.