IMPROVEMENTS IN STEAM BOLLER AND OTHER FURNACES, FIRE-BARS, AND FLUES
Year: 1870

page_text: LETTERS PATENT to George Lodge and George Sheard, both of
Leeds, in the County of York, for the Invention of " IMPROVEMENTS
IN STEAM BOLLER AND OTHER FURNACES, FIRE-BARS, AND FLUES."
Sealed the 2nd December 1870, and dated the 8th June 1870.
PROVISIONAL SPECIFICATION left by the said George Lodge and
George Sheard at the Office of the Commissioners of Patents, with
their Petition, on the 8th June 1870.
We, GEORGE LODGE and GEORGE SHEARD, both of Leeds, in the
County of York, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN STEAM BOILER AND OTHER FURNACES, FIRE-BARS, AND
FLUES," to be as follows:-
Our Invention consists of certain improved arrangements as here-
after described, whereby a quicker generation of steam, the consumption
of combustible gases and smoke, and a great economy in fuel is effected.
The first part of our Invention consists in making the fire-bars with
transverse grooves or openings from the upper surface downwards; the

page_text: bottoms of these grooves are gradually bevelled off from the centre to
each side in order to admit of an increased amount of atmospheric air.
The fire-bars are made capable of adjustment, whereby the attendant
when required may by an arrangement of levers or other mechanical
means raise or lower by preference every alternate bar, thereby sus-
pending the fire on half the number of bars. By this means a great
increase of draft is produced, and the heat of the furnace so intensified
that the combustible gases and smoke are consumed.
The second part of our Invention consists in the arrangement of the flues.
In boilers with double flues the flame and heated products are
carried down at the far end of the boiler into separate flues underneath.
These flues are provided with flame conductors at suitable intervals
apart, which may be of brickwork, and provided with doors or plates,
which may be removed at pleasure for the purpose of cleaning out the
flues. The flame and products after passing underneath the whole
length of the boiler are conducted into their respective side flues, in
which conductors may also be placed, thence to the chimney or stack
in the ordinary manner. In boilers with single flues the flues may be
of the ordinary kind, but provided with conductors arranged at suitable
intervals apart, and of the same construction as those in double flued
boilers.
In boilers not having internal flues the fire-bars are arranged similar
to those with internal flues. The flues leading to the chimney are of
ordinary construction, but provided with conductors arranged at intervals
and of a similar construction to those in boilers with double flues.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said George Lodge and George Sheard in the Great
Seal Patent Office on the 8th December 1870.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, GEORGE
LODGE and GEORGE SHEARD, both of Leeds, in the County of York, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Eighth day of June, in the year of
our Lord One thousand eight hundred and seventy, in the thirty-fifth

page_text: The second part of our Invention consist in the arrangement of the
flues. In boilers with double flues the flame and heated products are
carried down at the far end of the boiler into separate flues underneath.
These flues are provided with flame conductors or bafflers at suitable
intervals apart, which may be of brickwork and provided with doors or
plates which may be removed at pleasure for the purpose of cleaning out
the flues. The flame and products after passing underneath the whole
length of the boiler are conducted into their respective side flues, in
which conductors may also be placed, thence to the chimney or stack
in the ordinary manner. In boilers with single flues the flues may be
of the ordinary kind but provided with conductors arranged at suitable
intervals apart and of the same construction as those in double flued
boilers. In boilers not having internal flues the fire-bars are arranged
similar to those with internal flues. The flues leading to the chimney
are of ordinary construction but provided with conductors arranged at
intervals and of a similar construction to those in boilers with double
flues.
Fig. 1 (Sheet 1) is an elevation, and Fig. 2 a cross section of a fire-bar
which is provided with the openings a as shewn. By having the grooves
or openings a an increased amount of atmospheric air is admitted,
thereby the lower portion c of the firc-bar is kept comparatively cool
and the bending or giving way is thereby prevented. The fire-bars are
made capable of adjustment whereby the attendant when required may
by an arrangement of levers or other mechanical means raise or lower
and at the same time give a reciprocating horizontal motion to every
alternate bar, thereby suspending the fire on half the number of bars.
By this means a great increase of draft is produced, and the heat of
the furnace so intensified that the combustible gases and smoke are
consumed. In order to give greater strength to the bars, instead of
each bar being separate we connect every alternate three, as shewn
in Fig. 3, these may be cast in one, as shewn, or otherwise secured
together. We have here shewn the application of the Invention to a
double flued boiler; Fig. 4 is a longitudinal section; Fig. 5 front
elevation, and Fig. 6 a cross section taken at points A, B, and C, D;
Fig. 7 is an enlarged cross section through E, F ; a and b are the fire-
bars carried on the supports c, d, and e. Motion is given to the
fire-bars a and b by means of the cranks f and g, connected by gearing
as shewn, and made to revolve either by hand or power at a suitable

page_text: speed. It will be readily understood that by the revolving of the cranks
between the jaws h and i that the bars alternately have given to them
a vertical and simultaneously a horizontal reciprocating motion. To
each bar or each set of bars a feeder j is coupled by means of the rods or
links and l.
By these rods a horizontal reciprocating motion is transmitted from
the fire-bars. The feeders ; slide on the guides m which are carried
by the framework n. The hopper o is of ordinary construction
provided with a sliding door p, and carried by the framework n. The
framework n is provided with a sliding door q, for the purpose of
regulating the quantity of fuel delivered into the furnace. Within the
framework n and supported by it is formed an arch of fire-brick which
becomes hot and ignites the fuel on entering the furnace. It will be
readily understood that the fuel put in the hopper o will be carried
forward by the stepped feeders j, on to the fire-bars a and b, and con-
tinues its course allowing sufficient time for the combustible matter to
be consumed, thence it passes over the ends of the fire-bars & in the form
of ashes. The bars a and b are joined at points t to the short bars & as
shewn in Figs. 3 and 4 which can be raised or lowered at pleasure by
means of the cams u to which motion is given by the attendant through
the hand wheel v, worms and worm wheels w, and shafts x. The hollow
water bridge y is for the purpose of retarding the progress of the
fuel.
8
The second part of our Invention consists in an arrangement of flues.
Fig. 1 (Sheet 2) is a longitudinal section; Fig. 2, a cross section
through A, B; Fig. 3, a cross section through C, D, and Fig. 4, a
sectional plan.
We have here shewn a double flued boiler in which the flame and heated
products of combustion are carried down at the far end of the boiler as
shewn at a, and passed first underneath in the direction shewn by arrows,
and rise into the side flues b at points c, then along them as shewn by
arrows into the chimney or stack. The flues e are provided with flame
conductors or bafflers fat suitable intervals, which may be of brickwork
as shewn, and provided when the size of the flue may require it with
› doors or plates which may be removed at pleasure for the purpose of
cleaning the flucs. In boilers with single flues, the latter may be of
ordinary construction, but provided with flame conductors or bafflers
like those in double flued boilers.

page_text: In boilers not having internal flues the fire-bars are arranged similarly
to those with the internal flues. The flues leading to the chimney are
of ordinary construction, but provided with conductors arranged.
at intervals, and of a similar construction to those in boilers with double
flues.
Having now described the nature of our said Invention, and the
manner in which the same is to be performed, we would remark in
conclusion, that we do not limit ourselves to the exact details and con-
figuration of parts we have described and shewn, as the same may be
varied or modified without departing from the nature and principle of
our Invention, neither do we make a general claim to arrangements for
imparting a reciprocating motion to fire-bars, but what we do claim and
desire to be secured to us by Letters Patent are,-
Firstly. The arrangement of flues, substantially as and for the purposes
herein set forth.
Secondly. The construction and general arrangement of firc-bars
having a combined vertical and horizontal reciprocating motion sub-
stantially as and for the purposes herein set forth.
In witness whereof, we, the said George Lodge and George
Sheard, have hereunto set our hands and seals, this Sixth day
of December, in the year of our Lord One thousand eight hundred
and seventy.