Improvements in Heating Furnaces,
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in Heating Furnaces,
We, THOMAS SMITH, of Gringley-on-the-Hill, near Bawtry, in the County of
York, and WILLIAM SMITH, Misterton, near Gainsborough, in the County of
Lincoln, Blacksmiths, do hereby declare the nature of our said invention to be as
follows:-
Although our improved furnace may be employed for a variety of purposes it
is more particularly applicable for heating wheel tyres or hoops and the like
articles, and the object of our invention is to provide the means whereby such
articles may be more uniformly heated and whereby the consumption of fuel
emploved in the process may be less than is obtainable by furnaces as ordinarily
used for this purpose.
We carry out our invention in the following manner:
We construct the hearth of our improved furnace of a diameter and of a width
to accommodate within certain limits tyres or hoops of varying diameters. The
outer casing of the furnace may be built in brickwork or may be constructed of
iron. The inner ring or centre block of the furnace may likewise be constructed
either in brickwork or in iron or a combination of the two materials may be
employed.
This inner or central block however, would be carried upon a circular framing
which supports the fire-grates or fire-bars, and is provided with a central tapped
boss, the thread of which corresponds to the threads of a central standard or bolt
which is secured to cross bars or bearers which stay the outer framework of the
hearth below the firegrate last described.
By means of this mode of construction and the appliances here described the
hearth, with its fire bars and framing is made to revolve within the casing and
by means of the screwed central standard or bolt the hearth may be raised or
lowered within the casing so that the depth of the fire to be employed may be
varied according to circumstances.
Underneath this circular firegrate we form a flue or flues by which air is
admitted to the underside of the fire-bars. The outer wall of the said flue forms
the foundation of the outer casing of the furnace and the inner walls of the said
flue are formed round a central pier of brickwork or masonry which
with the outer walls support the cross bars or bearers, which stay the outer frame-
work of the furnace below the fire grate and likewise carry the central screwed
standard, by means of which the firegrate is raised and lowered and around the
axis of which it is made to revolve as already described.
We introduce the air or blast through suitable air grids or valves, conveniently
placed in the vicinity of the outer casing and in a position which may be called
the front of the furnace, and in the outer circumference of the casing of this
furnace we form a flue or flues to take off the waste products of combustion,
placed in what may be called the back of the furnace or opposite to the air inlet
grids or valves.
Over the firegrate or hearth of the furnace we employ a cover or covers in some

page_text: cases one cover may be employed which can be lifted by a chain passing over a
pulley with a balance weight, but by preference we should employ several
segmental covers which could be easily moved by hand so that any part of the
fire could be examined and attended to without opening the whole firegrato
at once.
From the foregoing description it will be seen that a wheel, tyre or hoop, or
like article may be laid in the hearth of this furnace, the fire in which would be
of uniform width and depth and by being made to revolve the heating may be
better regulated and a greater uniformity of temperature preserved through every
portion of the grate being subjected to the same conditions of draught.
Dated this 16th day of June 1898.
R. HEBER RADFORD,
Agent for the Applicants.
We, THOMAS SMITII, of Gringley-on-the-Hill, near Bawtry, in the County of
York, and WILLIAM SMITII, Misterton, near Gainsborough, in the County of
Lincoln, Blacksmiths, do hereby declare the nature of our said invention and in
what manner the same is to be performed to be particularly described in and by
the following statement:-
Although our improved furnace may be employed for a variety of purposes it
is more particularly applicable for heating wheel tyres or hoops and the like
articles, and the object of our invention is to provide the means whereby such
articles may be more uniformly heated and whereby the consumption of fuel
employed in the process may be less than is obtainable by furnaces as ordinarily
used for this purpose.
The nature of our invention will be better understood on reference to the accom-
panying sheet of drawings, in which,
Fig. 1. is a section taken through the centre of one of our improved furnaces.
Fig. 2. being half a plan of the same. Half this plan is shown with the fire
covers in position, and half of it with the covers removed.
Fig. 3. is another half plan of the furnace in section, one half of which being
in section on the line A, B, shows the plan of the circular framing or revolving
hearth plate, the other half in section on the line, C, D, shows the form of the base-
plate, with crossbars or bearers.
We carry out our invention in the following manner:
We construct the hearth of our improved furnace of a diameter and of a width
to accommodate within certain limits tyres or hoops of varying diameters. The
outer casing, A, of the furnace may be built in brickwork or may be constructed
of iron. The inner ring or centre block, B, of the furnace may likewise be
constructed either in brickwork or in iron or a combination of the two materials
may be employed.
This inner or central block however, would be carried upon a circular framing
or revolving hearth plate, C, which supports the fire grates or fire-bars, D, and is
provided with a central tapped boss, E, the thread of which corresponds to the
threads of a central standard or bolt, F, which is secured to a base plate, G, with
cross bars or bearers, G¹, which stay the outer framework of the hearth below the
firegrate last described.
By means of this mode of construction and the appliances here described, the
centre block of the hearth, B, with its fire-bars, D, and framing, C, is made to
revolve within the casing, A, and by means of the screwed central standard or

page_text: bolt, F, the revolving hearth may be raised or lowered within the casing so that
the depth of the fire to be employed may be varied according to circumstances.
Underneath this circular firegrate we form a circular flue or flues, H, by which
air is admitted to the underside of the fire-bars. The outer wall, A¹, of the said
flue forms the foundation of the outer casing of the furnace and the inner
walls, B', of the said flue are formed round a central pier of brickwork or masonry,
which with the outer walls support the base plate, G, with the cross bars or
bearers, G', which stay the outer framework of the furnace below the firegrate
and likewise carry the central screwed standard by means of which the firegrate
is raised and lowered, and around the axis of which it is made to revolve as already
described.
We introduce the air or blast through suitable air grids or valves, conveniently
placed in the vicinity of the outer casing and in a position which may be called
the front of the furnace and in the outer circumference of the casing of this
furnace we form a flue or flues, K, to take off the waste products of combustion,
placed in what may be called the back of the furnace, or opposite to the air inlet
grids or valves.
Over the firegrate or hearth of the furnace we employ a cover or covers, L, L,
in some cases one cover may be employed which can be lifted by a chain passing
over a pulley with a balance weight, but by preference we should employ several
segmental covers, as shown in the drawings, which could be easily moved by
hand so that any part of the fire could be examined and attended to without
opening the whole firegrate at once. We sometimes place cover or sill plates, J,
on the top of the brickwork of the said furnace.
From the foregoing description it will be seen that a wheel, tyre, or hoop, or
like article may be laid in the hearth of this furnace, the fire in which would be
of uniform width and depth and by being made to revolve, the heating may be
better regulated and a greater uniformity of temperature preserved through every
portion of the grate being subjected to the same conditions of draught.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is:-
1. In a furnace for heating wheel tyres, or hoops, and the like articles, the
arrangement and combination of parts and appliances by means of which the
firebars and framing with the central portion of the hearth are made to revolve
concentrically within a fixed outer casing and are raised or lowered within the
said casing so that the depth of the fire and its position with regard to the inlet
and outlet flues may be varied in the manner and for the purposes substantially
as herein described and illustrated.
Dated this 16th day of March 1800
R. HEBER RADFORD,
Agent for the Applicants.