Improvements in or relating to Furnaces for Heating Air.
Year: 1891

page_text: Date of Application, 16th Dec., 1891
Complete Specification Left, 16th Sept., 1892-Accepted, 22nd Oct., 1892
PROVISIONAL SPECIFICATION.
Improvements in or relating to Furnaces for Heating Air.
We, THOMAS HADFIELD of 5 Lower Talbot Street, Medical Baths Proprietor,
and WILLIAM ARTHUR SHAW of 1 Hounds Gate, Wholesale Clothier, both in
the Borough of Nottingham, do hereby declare the nature of this invention to be
as follows:-
This invention relates to furnaces for heating air for heating buildings, baths,
trains, and the like, or for other purposes.
In carrying out this invention the firebox is preferably arranged centrally and
the air entering at the lower part of a casing surrounding the fire box, passes round
the space between the firebox and the outer casing as it rises, and is delivered
at the upper part either through openings into the atmosphere or into a conduit by
means of which it is conveyed to any part of a building or the like.
The firebox is preferably formed by a vertical cylindrical casing provided near
the lower end with bars or a grating, an opening at the front below the bars or
grating for the withdrawal of ashes, aud an opening above for the withdrawal of fire
or refuse; it is also provided at the upper end with an opening in front for the
insertion of fuel, and a chimney which is carried out at the back.
The firebox is enclosed within an external casing between the interior of which
and the firebox is a surrounding air space; the openings in the firebox for with-
drawing ashes, fire, and for inserting fuel, are connected to corresponding openings
in the exterior casing, by pipes or shoots of a shape corresponding to the shape of
the openings so as to be in communication with and accessible from the exterior of
the outer casing, and are fitted with doors suitably arranged so that the combustion
may be regulated.
The air space between the firebox and exterior casing may be subdivided by a
helical partition, or horizontal partitions; in the latter case each air space is
divided by a vertical partition on one side of the firebox and the openings in the
horizontal partitions for the passage of the air are placed alternately on each side
of the vertical partitions, so that the air has to pass round the firebox in each
division before it can escape into the one above.
The lower part of the helical air space or the lower subdivision is in communi-
cation with the atmosphere and the air passing repeatedly round the firebox is
heated and delivered into an air space extending across the top of the firebox from
which it is conveyed by a system of pipes or conduits to where it is required; or it
may pass through gratings formed in the upper air space fitted with regulators,
or both.
The upper air space may be further heated by carrying the products of com-
bustion through a preferably metal flue passing one or more times round it.
The exterior of the firebox and the interior of the external casing may also be
formed with projecting ribs or flanges so as to increase the area of the heating
surface.
To increase the efficiency of the furnace, when required an air propeller, fan or
the like may be employed to increase the circulation of the air, or the intake
connecting the air space with the exterior of the building may be fitted at the
outer end with an arrangement for increasing the draught, actuated by the wind.
Dated this 16th day of December 1891.
W. P. THOMPSON & BOULT,
Agents for the Applicants.

page_text: COMPLETE SPECIFICATION.
Improvements in or relating to Furnaces for Heating Air.
We, THOMAS HADFIELD of 5 Lower Talbot Street, Medical Baths Proprietor,
and WILLIAM ARTHUR SHAW of 1 Hounds Gate, Wholesale Clothier, both in
the Borough of Nottingham, do hereby declare the nature of this invention and in
what manner the same is to be performed to be particularly described and ascer-
tained in and by the following statement:-
This invention relates to furnaces for heating air, for heating buildings, baths,
trains and the like, or for any other purpose, and it will be best understood by
reference to the accompanying drawings in which,
Figure 1 is a front elevation of a stove constructed according to our invention.
Figure 2 is a vertical cross section,
Figure 3 is a horizontal section on line of Figure 2 and
Figure 4 is a horizontal section on line y y of Figure 2.
Like letters indicate like parts throughout the drawings.
In carrying out this invention the firebox is arranged centrally and is surrounded
by a casing of increased size so as to leave an air space between the exterior of the
firebox and the interior of the casing.
The air enters at the lower part of the casing, passes round the firebox and is
heated as it rises, it is then delivered into an enlarged chamber extending across
the top of the firebox, from this chamber the air either passes through openings
into the atmosphere or into a conduit, by means of which it is conveyed to any part
of the building or the like.
The firebox is preferably formed as shown by a circular casing a provided at the
lower end with bars or a grating b, an opening a for the withdrawal of fire or
refuse and an opening a² at the upper part for the insertion of fuel, it is also
provided with a chimney or flue c which is carried at the back.
The firebox a stands over an opening in the top of the box d in which is contained
the ashbox ; the box d also supports the casing e which encloses the firebox,
and the casing surrounding the casing e, the outer casing is preferably provided
with perforations or gratings f" for the emission of air.
The openings a' and a² in the firebox a are connected to corresponding openings
in the exterior casings ef by shoots or pipes a³ and a respectively, so as to be in
communication with and readily accessible from the exterior of the stove; they are
also fitted with doors conveniently arranged as is also the ashbox d¹ so that the
rate of combustion may be regulated.
The air space between the firebox a and the surrounding casing e may be sub-
divided by a helical partition or as shown by horizontal partitions g, the spaces
between which on one side of the firebox, are filled in by vertical partitions g¹ see
Figure 4. The openings g² in the horizontal partitions 9 are placed alternately on
each side of the vertical partitions g' so that the air is obliged to pass round the
firebox in each division before it can escape into the one above.
The lower air space is provided with an air inlet g at the side of the ashbox and is
thus in communication with that part of the box d that is open to the atmosphere.
Above the firebox a is an enlarged air chamber formed by the casing this is
surmounted by a dome j to the upper end of which the hot air supply pipe is
connected. The chimney or flue c is carried one or more times round this chamber
then out at the back as shown.
The air enters at the inlet 93 and after passing repeatedly round the firebox a,
between the partitions is delivered into the air chamber 7 where it is further
heated by the flue e, froin this chamber it may be conveyed by a system of pipes or
conduits to where it is required, or may be delivered direct into the atmosphere.
To increase the efficiency of the firebox it may be fitted with projecting ribs or

page_text: flanges; the flue e may also be provided with branches extending to the front
part of the casing i so as to provide means for cleaning ont the flue.
When requisite a fan or other air propeller may be employed to increase the
circulation of the air in the stove, in this case the propeller may be connected by a
pipe or conduit to the inlet g*.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
:-
1. In a stove such as described the employment of a firebox such as a and flue
such as enclosed respectively in a casing or casings such as e and i substantially as
described and illustrated in the accompanying drawings.
2. In a stove such as described the combination with a firebox such as a and
casing e of partitions such as g-g' substantially as described and illustrated in the
accompanying drawings.
3. In a stove such as described the combination with a firebox such as a and
casing of a helical partition substantially as herein described.
E
4. In a stove such as described the combination with a firebox a casing e and
partitions g of ribs or flanges such as substantially as described and illustrated in
the accompanying drawings.
5. The combination and arrangement of parts constituting the complete stove
substantially as herein described and illustrated in the accompanying drawings.
Dated this 15th day of September 1892.
THOMAS HADFIELD.
WILLIAM ARTHUR SHAW.
W. P. Thompson & Boult,
Agents for the Applicants.
THOMAS HADFIELD.
WILLIAM ARTHUR SHAW.
W. P. Thompson & Boult,
Agents for the Applicants.