Year: 1897

page_text: Date of Application, 1st Mar., 1897-Accepted, 10th Apr., 1897
.
I, Sir JOHN SMITH, Knight, of Park Field, Derby in the County of Derby, do
hereby declare the nature of this invention and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:
The object of my invention is to facilitate the combustion of fuel, and more
especially of coke and of the gases arising from such fuel, by means of improved
fire bars or air channels arranged and combined in a fire grate in such a manner
as to increase the supply of air to the various parts of the fire.
In describing my invention reference will be had to the different figures upon
the accompanying sheet of drawings:-
Figure 1 is a plan shewing the application of my invention to the bottom of an
existing fire grate.
Figure 2 is a section on line a. a. of Figure 1.
Figure 3 is a section on line 6. b. of Figure 1.
Figure 4 is a plan shewing the application of my invention to the bottom of a
grate as it would appear if cast in a piece therewith as will be hereinafter
explained.
Figure 5 is a section on line c. c. of Figure 4.
Figure 6 is a section on line d. d. of Figure 7 shewing the application of my
invention to a large boiler or other furnace as will be hereinafter explained.
Figure 7 is a cross section on line e. e. of Figure 6.
Figure 8 is a section on line f. f. of Figure 9 shewing an application of my
invention in which the improved fire bar is made of fire-clay, plumbago, or other
heat resisting substance.
Figure 9 is a section on line σ. of Figure
Figure 10 is an elevation shewing a light form of front which may be used in
combination with my improved fire bar in ordinary domestic fire grates and
the like.
In carrying out my invention I cause each of my improved fire bars or air
channels to be cast or otherwise constructed in the form of an inverted trough of a
tapering or angular cross section with a narrow opening or slot along the top for
the passage and delivery of air some distance into the body of the fuel, in the
majority of cases.
I will first describe my invention as applied to the ordinary domestic fire
grate:
Figures 1, 2 and 3 illustrate a number of my improved fire bars A bolted or
otherwise screwed down or fixed to the bottom grate B from front to back of the
fire place, the air passing in the direction of the arrows through the longitudinal
slots C well into the body of the fuel, between each pair of the improved bars A
I prefer to leave one or more of the openings D in the bottom of the grate for the
admission of air to the lower part of the fire place and for the purpose of enabling
the bottom of same to be cleared of cinders, ashes and the like.
Figures 4 and 5 illustrate how my improved fire bars A₁ may be cast or
otherwise formed solid with the bottom of the grate B', the air passing through
the slots C¹ in same as already described, intermediate openings D' being left of
any convenient form and number between the said special bars as and for the
purposes hereinbefore described' with reference to Figures 1, 2 and 3. The light
DOJ1

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:
front grating shewn on Figure 10 is to be placed on the front of such fire places
illustrated on Figures 1, 2, 3, 4 and 5, for the purpose of preventing small sized
fuel, such as coke, falling out at the front of the fire place.
Upon Figures 6 and 7 is illustrated a form of my invention, in which the tops of
the fire bars A' do not project into the fire, the ends of the said bars being placed
in recesses formed in the framing E and the tops of the bars all coming flush, form
the bottom of the fire grate, this application of my invention is more particularly
adapted for the furnaces of steam boilers and the like which are subjected to
intense heat and accumulation of slag, which would be likely to melt fire bars
projecting upwards into the fire; it will be seen from Figures 7 and 8 that the
cross and longitudinal sections of such a bar would be substantially the same as
those already illustrated. The forms of my improved bars or air channels
illustrated on Figures 1, 2, 3, 4, 5, 6 and 7 may be of any suitable metal such as
steel; malleable iron; cast iron or the like.
The application of my invention illustrated on Figures 8 and 9 is intended for
use when it is desired to project 'the bars A³ into the body of the fuel in the case
of steam boiler furnaces and the like where they will be subjected to intense heat;
to prevent melting they are preferably formed of fire-clay, plumbago or other heat
resisting substance and as will be seen are of a proportionately increased thickness,
of material.
I do not bind myself to any particular method of fixing my improved bars or air
channels to the framing of the fire grates or furnaces nor yet to any particular
size, proportion or material so long as they are of a tapering cross section and
slotted either wholly or at intervals, as shewn.
It will also be evident that I may introduce my improved bars or air channels
either at the bottom, front, back or sides of any grate, fire place or furnace
although they will probably be found of greatest advantage when applied to the
bottom thereof. I may leave any desired spaces between the said bars or air
channels and may use them either alone or in conjunction with ordinary fire grate
openings as illustrated, and, I may if desired arrange any special air conductor or
conductors to any desired part of the fire grate or furnace to supply air to my
improved fire bars or air channels, the said conductor or conductors terminating in
suitable openings at the front of the grate or they may be carried to external
openings if desired.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
: 1. The improved fire bars or air channels of a tapering inverted trough or
angular form in cross section slotted for the admission of air to the body of the
fuel and projecting into the said fuel substantially as described and illustrated
upon Figures 1, 2, 3, 4, 5, 8 and 9.
2. The improved fire bars or air channels of a tapering inverted trough or
angular form in cross section slotted for the admission of air to the fuel, but not
projecting into the body of the said fuel, substantially as described herein and as
illustrated upon Figures 6 and 7.
1
T
1007
Dated this 27th day of February 1907.
W. SWINDELL,
Imperial Chambers, Albert Street, Derby, Agent for the Applicant.