IMPROVEMENTS IN STOVES AND FIRE GRATES
Year: 1879

page_text: LETTERS PATENT to David Ogilvy Boyd, of No. 9, Conduit Street, in the
County of Middlesex, for the Invention of "IMPROVEMENTS IN STOVES AND
FIRE GRATES."
Sealed the 30th April 1880, and dated the 12th November 1879.
PROVISIONAL SPECIFICATION left by the said David Ogilvy Boyd at
the Office of the Commissioners of Patents on the 12th November 1879.
DAVID OGILVY BOYD, of No. 9, Conduit Street, in the County of Middlesex.
"IMPROVEMENTS IN STOVES AND FIRE GRATES."
This Invention has for its object improvements in stoves and fire grates. In
order to effect a saving of fuel in the use of close stoves and open fire grates by
reducing the temperature at which smoke and other products of combustion pass
into the chimney, I adopt the well known expedient of giving a tortuous course to
the flues by which the said products are conducted to the chimney, and so obtain
a large area of surface for imparting heat to the air of, or to be admitted to, the
room or building to be warmed. The plan of employing tortuous flues has hitherto
been limited in practice by the difficulty of sweeping or cleansing such distorted or
indirect flues. My Invention overcomes this difficulty. I arrange the fire box or
the fire basket to be removeable from its flues, and so that it can be drawn out
away and separated from the flues so as to leave the flues exposed and directly
accessible for sweeping or cleansing.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said David Ogilvy Boyd in the Great Seal Patent Office on the 11th
May 1880.
DAVID OGILVY BOYD, of No. 9, Conduit Street, in the County of Middlesex.
"IMPROVEMENTS IN STOVES AND FIRE GRATES."
This Invention has for its object improvements in stoves and fire grates. In
order to effect a saving of fuel in the use of close stoves and open fire grates by
reducing the temperature at which smoke and other products of combustion pass
into the chimney, I adopt the well known expedient of giving a tortuous course to
the flues by which the said products are conducted to the chimney, and so obtain
a large area of surface for imparting heat to the air of, or to be admitted to, the
room or building to be warmed. The plan of employing tortuous flues has hitherto
been limited in practice by the difficulty of sweeping or cleansing such distorted or
indirect flues. My Invention overcomes this difficulty. I arrange the fire box or
the fire basket to be removeable from its flues, and so that it can be drawn out
away and separated from the flues so as to leave the flues exposed and directly
accessible for sweeping or cleansing.
In order that my said Invention may be most fully understood and readily
carried into effect I will proceed to describe the Drawings hereunto annexed.
DESCRIPTION OF THE DRAWINGS.
The Figures on Sheet 1 relate to a close stove, suitable for a church or large
building.
Figure 1 is an elevation of the front of the stove, with its fire and ash doors,
and represents the first two parallel plates or gills of the body of the stove.
Figure 2 is an elevation of the back of the stove, with its nozzle to receive the
smoke pipe, and represents the two back parallel plates or gills of the body of the
stove.
Figure 3 is an horizontal section, and represents the body of the stove bolted
together, with the hearth plate upon which it stands, with fire door projected with
the fire lump furnace and smoke nozzle at the back.
Figure 4 is a transverse section through A, B, and shows the fire box mounted
on wheels for ready removal. The position of the smoke nozzle beyond the fire box
is indicated by dotted lines.
Figure 5 is a longitudinal section through C, D; in this Figure, at a, a, there is
seen one of the (two) side openings or escapes for the descending smoke and products
of combustion into the back flue b behind the fire box on their passage to the
chimney through the smoke pipe nozzle.
This stove is intended to be enclosed in an ornamental openwork casing, indicated
by dotted lines in Figure 5.
I do not limit myself to the escape of the smoke immediately by an ascending
chimney; the stove is equally applicable where there is a descending flue for a
portion of its course to the vertical chimney shaft.
I make no claim of novelty for the arrangement of the stove with plates or gills
bolted together, neither do I claim the arrangement of the fire box with bottom
wholly or partially solid, all such arrangements being well known and understood,
but I claim the arrangement whereby the fire box may be drawn out and away
from the body of the stove either on wheels or otherwise, so as to leave the flues
within and about the body of the stove directly accessible for sweeping or
cleansing.
The Figures on Sheet 2 relate to an open stove suitable for domestic use.

page_text: Figure 1 is an elevation of the grate, with its sliding blower and fire basket in
position for use.
Figure 2 is an horizontal section through A, B.
Figure 3 is a vertical section through C, D.
Figure 4 is a similar section reversed, and with the fire basket removed or lifted
out.
The smoke and heated products of combustion rise in the first instance, and then
descend to the right and left behind the sides or cheeks of the fire grate until at or
about the level of the bottom grating of the fire; they are enabled to escape and
rise again by the back flue to the chimney. A similar arrangement is applicable to
stoves or grates having a descending flue passing to the chimney. By causing the
heated products to take a tortuous course much of the heat which usually escapes
by the chimney is imparted to the outer case or body of the grate, which thus
gives additional warmth of radiation, or by contact with air to the room to be
warmed.
I make no claim of novelty for thus giving the flues a tortuous course, which has
been long practiced, but I claim the arrangement whereby the fire basket of the
grate may be removed from its position, exposing the flues within and about the
grate and giving access to the main chimney for cleansing or sweeping the same.
In witness whereof, I, the said David Ogilvy Boyd, have hereunto set my
hand and seal, this Eleventh day of May, in the year of our Lord One
thousand eight hundred and eighty.
A
TAVD