IMPROVEMENTS IN STOVE GRATES
Year: 1873

page_text: LETTERS PATENT to William Corbitt, of Masbro' Works, Rotherham,
in the County of York, Stove Grato Manufacturer, for the Invention
of "IMPROVEMENTS IN STOVE GRATES."
Scalod the 19th August 1878, and dated the 22nd February 1873:
PROVISIONAL SPECIFICATION left by the said William Corbitt at the
Office of the Commissioners of Patents, with his Petition, on the.
22nd February 1878.
. I, WILLIAM CORBITT, of Masbro' Works, Rotherham, in the County
of York, Stove Grate Manufacturer, do hereby declare the nature of my
said Invention for "IMPROVEMENTS IN STOVE GRATES," to be as follows:-
This Invention relates to a peculiar form and arrangement of the fire-
box of a stove grate, and consists in combining together vertical sides
and a curved back composed of fire-brick or other suitable material, tho
said curved back being made to project at its lower part into the fire
space, thereby contracting such space, absorbing heat, and consequently
economising fuel. The heat absorbed by the back of the grato, which is

page_text: by preference made of fire-brick, is conducted to the air, which enters
one or more heating chambers made behind the grate, the said air after
having been heated issuing through suitable openings in the front of
the grate into the apartment. By curving the back of the grate forward
space is obtained so as to form an air chamber immediately under the 5
fire at the point where the cold air is first admitted.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said William Corbitt in the Great Seal Patent Office
on the 20th August 1873.
TO ALL TO WHOM, THESE PRESENTS SHALL COME, I, WILLIAM
CORBITT, of Masbro' Works, Rotherham, in the County of York, Stove
Grate Manufacturer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-second day of February, in the
year of our Lord One thousand eight hundred and seventy-three, in the 1
thirty-sixth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said William Corbitt, Her special license
that I, the said William Corbitt, my exccutors, administrators, and
assigns, or such others as I, the said William Corbitt, my executors,
administrators, or assigns, should at any time agree with, and no others, 2
from time to time and at all times thereafter during the term therein
expressed, should and lawfully might make, use, exercise, and vend,
within the United Kingdom of Great Britain and Ireland, the Channel
Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN STOVE
GRATES," upon the condition (amongst others) that I, the said William 2
Corbitt, my executors or administrators, by an instrument in writing
under my hand and seal, should particularly describe and ascertain the
nature of the said Invention, and in what manner the same was to be
performed, and cause the same to be filed in the Great Seal Patent
Office within six calendar months next and immediately after the date 3
of the said Letters Patent.
NOW KNOW YE, that I, the said William Corbitt, do hereby declare
the nature of my said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the

page_text: following statement, reference being had to the accompanying Drawings,
and to tho letters and figures marked thereon, that is to say :—
'
My said Invention relates to a peculiar form and arrangement of tho.
fire-box of a stove grato, and consists in combining together vertical
sides and a curved back composed of fire-brick or other suitablo
material, tho said curved back being provided with gills or projections,
and made to project at its lower part into the fire space, thereby con-.
tracting such space, absorbing heat, and consequently economising
fuel. The heat absorbed by the back of the grato, which is by preference
made of fire-brick, is conducted to the air which enters one or moro
heating chambers made behind the grato, the said air after having been
heated issuing through suitablo openings. in the front of the grate into
the apartment. By curving the back of the grato forward space is
obtained so as to form an air chamber immediately under the fire at tho
point where the cold air is first admitted.
And in order that my said Invention may be fully understood I shall
now proceed more particularly to describe the same, and for that purpose
shall refer to the several Figures on the annexed Sheet of Drawings,
the same letters of reference indicating corresponding parts in both
Figures.
Figure 1 of the annexed Drawings represents a vertical section of my
improved construction of stove grate, and Figure 2 is a similar section
of a slightly modified construction of tho samo.
A is the fuel basket or fire-box, the bottom B of which is connected
to or formed in one piece with the metal back O. The metal back O
may be made straight, and fitted with my improved curved fire-brick
back D, as shewn in Figure 1, or the metal back O itself may be curved,
as shewn in Figure 2, and lined or not as desired with fire-clay. The
lower part of the curved back is made to project some distance into the
fire space, and serves to partly support the fuel, thereby more effectually
absorbing heat, whilst at the same time it considerably contracts the
lower part of the fire-box, and consequently economises the consumption
of fuel. Immediately behind the metal back O there is a chamber E
which extends partly beneath the bottom B of the fire-box, as shown at
E', and into this chamber cold air from without is admitted by the
passage F beneath the hearth, a slide or valve G being provided to
regulate the admission of such air. Gills or projections H, H, are fitted

page_text: or formed on the metal back C, and on the bottom B of the fire-box,
such gills extending into the air chamber E, E¹. These gills or pro-
jections become highly heated, and consequently increase the surface for
heating the air. The cold air as it enters the chamber E is caused to
travel over the heated surface of the gills H, H, thence round the sides of
the stove into a chamber I situate in the front thereof, from which latter
chamber it passes into the apartment in a heated condition through
perforations K in the front of the stove, as indicated by the arrows.
The bottom B of the fire-box is provided near the front thereof with
slits or perforations L for the admission of air to support combustion.
Having now described and particularly ascertained the nature of my
said Invention and the manner in which the same is or may be used
or carried into effect, I would observe in conclusion that what I consider
to be novel and original, and therefore claim as the Invention secured to
me by the herein-before in part recited Letters Patent is,—
First. Constructing stove grates with curved backs, the lower part of
which is made to project into the fire space, substantially as and for the
purpose herein-before described and illustrated by my Drawings.
Second. Forming an air chamber immediately below the firc-box at
the part where the cold air is first admitted, as herein-before described
and illustrated by my Drawings.
In witness whereof, I, the said William Corbitt have to this my
Specification set my hand and seal, the Thirteenth day of
August One thousand eight hundred and seventy-three.
WILLIAM CORBITT. (L.s.)