Improvements in and connected with Furnaces for Steam Boilers and other purposes.
Year: 1895

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Date of Application, 30th May, 1895
Complete Specification Left, 30th July, 1895-Accepted, 31st Aug., 1895
PROVISIONAL SPECIFICATION.
Improvements in and connected with Furnaces for Steam Boilers
and other purposes.
We, SAMUEL FARNSWORTH of 280 Osmaston Road, Derby in the County of
Derby, Foundry Manager, and JOSEPH ALBERT ARNOLD of Tresillian, Duffield
Road, Derby aforesaid, Ironfounder, do hereby declare the nature of this invention
to be as follows:-
The principal object of our invention is to effect a more perfect combustion in
furnaces and enable us to use a less expensive fuel than is now generally admissable,
although our invention is here described in reference to furnaces for steam boilers
it will be understood that it is applicable for other purposes, such as for forges and
the like.
:
In describing our invention we will first relate to the construction of the fire
bars forming the grate upon which the fuel is burnt. Upon each side of each bar
we form any suitable number of recesses of a semi-truncated cone shape in vertical
section or of any other suitable tapering shape so long as the said recesses are
larger on the underside than on the top these recesses are for the admission of air
or steam from an air chamber below, to be hereinafter described when the bars
are placed side by side the said recesses are arranged to alternate or break joint
with each other, the recesses in one bar coming against the flat side of the one
next to it, we thus provide double the number of holes or recesses for the admission
of steam or air, as will be explained. There has hitherto been constant danger of
the slag or clinker, formed in most furnaces, filling up any holes formed for the
purpose above described, to obviate this we arrange a groove or grooves, preferably
one in number, or recesses, down the centre of the top surface of the bar into
which the slag or clinker will run and thus prevent the holes being blocked up as
above stated.
In further carrying out our invention we place an air tight chamber under
the fire bars in the front of which we place one or more openings in com-
munication with a suitably formed bell, pipe or pipes in which are placed
steam jets the whole being connected in any suitable manner to the upper part of
the steam boiler and controlled by any suitable valve: the said pipe and jets being
proportioned to the size and shape of furnace. Underneath the steam inlet or
inlets we arrange any suitable cleaning hole with door and fastenings for cleaning
out the air-tight chamber. Across the inside of the said chamber we place one or
more diaphragms of suitable depth, shape and position to properly deflect and
distribute the forced draught as it issues from the steam injector pipe, or pipes
underneath the whole surface of the fire-bars, and at the same time, so as not to
interfere with the cleaning out of the said chamber.
The steam pipe from the upper part of the boiler may be superheated if desired
by means of a pipe connected thereto and circulating in any suitable manner inside
the furnace.
We may also arrange any suitable means by which any desired air pressure
may be maintained in the air chamber such as by connecting a main pipe thereto
from a pan or pressure blower, to be used either with or without the assistance of
the steam jets according to the purpose required.
The passage of the products of combustion into the chimney may be regulated

page_text: by any suitable damper, and the different parts of our invention may be fixed upon
or to any suitable bearers by any well known means.
Dated this 29th day of May 1895.
W. SWINDELL,
Agent for the Applicants.
Improvements in and connected with Furnaces for Steam Boilers
and other purposes.
We, SAMUEL FARNSWORTH of 280 Osmaston Road, Derby in the County of
Derby, Foundry Manager, and JOSEPH ALBERT ARNOLD of Tresillian, Duffield
Road, Derby aforesaid, Ironfounder, 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 principal object of our invention is to effect a more perfect combustion in
furnaces and enable us to use a less expensive fuel than is now generally
admissable; although our invention is here described in reference to furnaces for
steam boilers it will be understood that it is applicable for other purposes, such as
for forges and the like.
Referring to the accompanying sheets of drawings which form a part of this
Specification :-
Figure 1 is a half side elevation of one of our improved furnace fire-bars.
Figure 2 is a half plan of two of our improved fire-bars laid side by side.
Figure 3 is a half plan shewing alternative arrangements of our improved
fire bar.
Figure is a vertical section on line 'a.' 'a.' of Figure 1.
$
Figure 5 is a vertical section on line b.' '.' of Figure 3.
Figure 6 is a vertical section on line 'c.' 'c.' of Figure 3.
Figure 7 is a front elevation of boiler and furnaces shewing the application of
part of our invention.
Figure 8 is a longitudinal section shewing the application of our invention.
Figure 9 is a plan to a reduced scale immediately above the fire-bars shewing
the method of introducing steam thereunder.
Figure 10 is a vertical section on line 'd.' 'd.' of Figure 9.
Figure 11 is a plan, Figure 12 a front sectional elevation and Figure 13 a back
elevation of an alternative arrangement for steam jet pipes.
In describing our invention we will first relate to the construction of the fire-bars
forming the grate upon which the fuel is burnt. Upon each side of each bar A
we form any suitable number of recesses B of a semi-truncated cone shape in
vertical section or of any other suitable tapering shape so long as the said recesses
are larger on the underside than on the top, for instance upon Figure 3 the
recesses are shewn of a rectangular form and some with rounded corners, these
recesses are for the admission of steam or air from a closed ash-pit C¹ below, to
be hereinafter described: when the bars are placed side by side the said recesses
are arranged to alternate or break joint with each other, the recesses in one bar
coming against the flat side of the one next to it, see Figures 2 and 3, we thus provide
double the number of holes or recesses for the admission of steam or air, as will be
explained. There has hitherto been constant danger of the slag or clinker, formed
in most furnaces, filling up any holes for the purpose above described, to obviate
this we arrange a groove D down the centre of the top surface of the bar into
which the slag or clinker will run and thus prevent the holes being blocked up
as above stated; moreover the groove will become filled or partly filled with

page_text: clinker dust and the latter will greatly assist in preventing the bars from being
overheated.
We place a front plate C in the ash-pit, hermetically closing the same and
forming an air tight chamber C' under the fire bars and in further carrying out our
said invention we place one or more openings E in the plate in front of the said
chamber and in communication with a suitably formed bell F (or short tubes or
pipes in combination therewith as shewn upon Figures 11, 12 and 13) in which re
placed steam jets G the whole being connected in any suitable manner such as by
the tube or pipe H to the upper part of the steam boiler I and controlled by any
suitable valve K: the said pipe and jets being proportioned to the size and shape
of furnace. Although upon the drawings we have shewn three steam jets to each
bell F or combination of tubes F, we wish it to be understood that we may use
any number of jets above two therewith according to the size of the boiler.
Underneath the steam inlet or inlets we arrange any suitable cleaning hole L with
door and fastenings for cleaning out the closed ash-pit. Across the inside of the
said ashpit when necessary we place one or more deflecting plates M of suitable
depth, shape and position to properly deflect and distribute the forced draught, as
it issues from the steam injector pipe, or pipes, underneath the whole surface of
the fire-bars, and at the same time, so as not to interfere with the cleaning out
of the said chamber.
The steam pipe from the upper part of the boiler may be superheated if desired
by means of a pipe N connected thereto and circulating in any suitable manner
inside the furnace.
We may also arrange any suitable means by which any desired air pressure may
be maintained in the closed ash-pit such as by connecting a main pipe thereto from
a fan or pressure blower, to be used either with or without the assistance of the
steam jets according to the purpose required.
The passage of the products of combustion into the chimney may be regulated
by any suitable damper, and the different parts of our invention may be fixed upon
or to any suitable bearers by any well known means.
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. The improved fire-bar having semi-truncated conical or other tapering feed
openings for steam or air formed in the sides thereof and alternating or breaking
joint with each other, and a groove on its upper surface for the reception of clinker
and clinker dust, to prevent the choking of the air or steam inlets and overheating
of the fire-bar, substantially as described and illustrated.
2. The arrangement of two or more steam jets G either with or without the
superheating pipe N in combination with the oval bell F or arrangement of
tubes F and closed ash-pit C' with one or more deflecting plates M, substantially
as described and illustrated.
3. The improved fire-bars in combination with the closed ash-pit C' with
bell For F, deflecting plates M, steam jets G and either with or without the
superheating pipe N substantially as described and illustrated.
4. The improved fire-bars in combination with the closed ash-pit C₁ and
deflecting plates M and a forced blast by means of an engine pressure blower,
either in combination with or without the steam jets G and oval bell F or F¹ and
superbeating pipe N substantially as described and illustrated.
5. The whole substantially as and for the purposes described and illustrated.
W. SWINDELL,
Agent for the Applicants.