This document is a patent application for improvements to domestic firegrates. It describes a firegrate with a chamber below the oven and a baffle located at the front of the chamber. The baffle extends upward from the firegrate to form a passage below the oven, drawing some combustion gases downward and upward through the chamber and passage to heat the oven. The baffle may include flanges to direct gases and support a firebrick facing the chamber. This design improves oven heating over previous domestic firegrates.

1. * GB780049 (A)
Description: GB780049 (A) ? 1957-07-31
Improvements in and relating to domestic firegrates
Description of GB780049 (A)
PATENT SPECIFICATION
780,049 Date of filing Complete Specification: April 20, 1956.
Application Date: April 22, 1955.
No. 11661/55.
% Complete Specification Published: July 31, 1957.
Index at acceptance:-Class 126, B44E1.
International Classification:-F24b.
COMPLETE SPECIFICATION
Improvements in and relating to Domestic Firegrates I, ALLAN FOREBES
URE, a British Subject, of Springbank Ironworks, 'Keppochhill Road,
Glasgow, N, Scotland, do hereby declare the invention, for which I
pray that a patent may be granted to me, and the method by which it is
to be performed, to be particularly described in and by the following
statement:-
This invention has reference to domestic firegrates of the type
provided with an oven and a chamber located below the oven, said
chamber being open only at the front thereof and extending downwards
beyond the fire bars to the ash pit.
The present invention has for its object to provide improvements in
such domestic firegrates by which the oven will be better heated than
is the case in such firegrates as previously constructed.
According to the present invention a domestic firegrate of the type
set forth is characterised by the provision of a baffle located at the
front of said chamber and extending upwardly from the firegrate to
form a passage below the bottom of the oven whereby part of the
gaseous products of combustion are drawn downwardly between the fire
bars, upwardly to the rear of the baffle into the chamber and then
through said passage to unite with the gaseous products of combustion
passing upwardly from the fire bed.
The invention further consists in a firegrate as set forth in the

2. preceding paragraph wherein the baffle is in the form of a plate
having a transverse slot therein, the upper peripheral edge of such
slot registering with the bottom of the oven and the slot forming the
passage through which pass the gaseous products of combustion from the
chamber.
The lower edge of the baffle may be provided with a flange projecting
into the chamber so as to deflect the gaseous products of combustion
towards the rear of said chamber.
The invention further consists in a domestic firegrate as set forth in
any of the three preceding paragraphs wherein the baffle is provided;
with a flange which supports a transversely extending firebrick facing
the combustion chamber.
[Price 3s. 6d.] The invention is particularly, but not exclusively,
adapted to back-to-back firegrates and the invention will now be
described as applied to such firegrates and as shown in the
accompanying drawings wherein: Figure 1 is a sectional side elevation
of a back-to-back grate with the present invention applied thereto;
and Figure 2 is a similar view showing a further construction of
baffle.
In a back-to-back firegrate there is the grate proper A which is
provided with a suitable surround and which is used to heat, say, a
living room, and an oven B and hot plate C located at the rear of the
grate proper and which constitute a cooker.
According to the invention as shown in Figure 1 a chamber 1 is
positioned below the oven B, the bottom of the oven constituting the
top of said chamber., Said chamber is closed at its rear and the
bottom thereof slopes downwardly and forwardly as at 2 towards the ash
pit 3, positioned below the grate 4. The usual hot water boiler 5 is
located at the rear of the grate and forms a passage 6 for the gaseous
products of combustion between the boiler and the rear of the oven,
the boiler being somewhat lower than the bottom of the oven. Extending
transversely of the grate is a baffle 7 which terminates at or near
the rear of the grate 4 and extends upwardly therefrom at the rear of
the boiler 5, to form a transverse slot or passage 8 between the top
thereof and the bottom of the oven. This baffle may have a rearwardly
directed flange 9 extending along its lower edge or it may have a
forwardly directed, flange 10 extending along said edge and supporting
a firebrick facing 11, see Fig. 2. Or the baffle may be provided with
both a forwardly and rearwardly directed flange, the former supporting
the fire brick.
When the improved firegrate is in use the greater part of the products
of combustion will pass below and upwardly to the rear of the boiler
and in its upward passage will heat the 'oven, 'Part of the gaseous
products of combustion will, by chimney draught, 'be drawn downwardly

3. between the fIrebars of the grate 4 then into the chamber 1 below the
baffle, upwardly to impinge on the bottom of the oven and then
forwardly through said passage 8 to join the products of combustion
passing upwardly between the oven and boiler. The gaseous products of
combustion pass upwardly through the passage 6, then below the hob C
and are then conducted to the usual vertical flue or uptake as shown,
for example, in our prior patent No. 630,340.
By forming the baffle with the rearwardly extending flange 9 the
products of combustion which pass therebelow are deflected to the rear
of the chamber before passing through the passage 8.
The baffle may extend below the level of the grate, of if desired, it
may be formed integral with the grate.
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