CERTAIN IMPROVEMENTS IN FURNACES FOR STEAM BOILERS AND OTHER PURPOSES
Year: 1875

page_text: LETTERS PATENT to Ellis Butterworth, of Calder Cottage, near
Rochdale, in the County of Lancaster, for the Invention of
"CERTAIN IMPROVEMENTS IN FURNACES FOR STEAM BOILERS AND OTHER
PURPOSES."
Sealed the 6th October 1875, and dated the 9th April 1875.
PROVISIONAL SPECIFICATION left by the said Ellis Butterworth
at the Office of the Commissioners of Patents, with his Petition,
on the 9th April 1875.
I, ELLIS BUTTERWORTH, of Calder Cottage, near Rochdale, in the
County of Lancaster, do hereby declare the nature of the said In
vention for "CERTAIN IMPROVEMENTS IN FURNACES FOR STEAM BOILERS AND
OTHER PURPOSES," to be as follows:-
-
My Invention relates to that class of furnaces in which a progressive
motion is given to the fuel, and in which hollow grate bars through
which water circulates are used, and consists,―
First. In feeding the fuel into the furnace by means of sliding plates,

page_text: reciprocating plungers, or other means which cause the fuel to pass on
to the hollow grate bars without the intervention of sliding grate bars,
and I propose to carry the fire along the hollow bars by means of plain
scalers or scalers without teeth.
Secondly. I propose to feed the fuel on to or into the mass of burning -5
fuel at a distance above the grate bars. In some cases I propose to use
a set of stationary grate bars or a plate, the top of which stands somo
distance above the hollow bars, and over this plate or grate the fuel is
pushed on or into the fuel on the other bars.
Thirdly. I propose to make the sliding feed plates to overlap cach 1
othor, and to have fixtures bolted on the sides of the furnace to prevent
the fuel falling when passing into the furnace.
Fourthly. I propose to make the tubular bars flat or nearly so on the
top where the fuel rests, and round at the ends where they are fastened
to the boxes which convey the water to and from them. These boxes 18
I propose to make of wrought or of malleable cast iron, steel, copper, or
brass.
Fifthly. In some cases I propose to form the hollow bars with two
cavities so that the water can flow down one and up the other.
Sixthly. I propose to drive these furnaces by means of ratchet wheels 20
and catches; by this means they can be driven faster or slower, as
required.
'
Seventhly. Or instead of a ratchet wheel a pulley moved by a catch
or clip, such as known as the "silent feed," may be used. I propose to
claim the use of this motion on all furnaces in which a progressive 2
motion is given to the fuel.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Ellis Butterworth in the Great Scal Patent
Office on the 9th October 1875.

page_text: WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Ninth day of April, in the year
of our Lord One thousand cight hundred and seventy-five, in the thirty-
cighth year of Her reign, did for Herself, Her heirs and successors, give
and grant unto me, the said Ellis Butterworth, my executors, admini-
strators, and assigns, or such others as I, the said Ellis Butterworth, my
executors, administrators, and assigns, should at any time agree with,
and no others, 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 "CERTAIN
IMPROVEMENTS IN FURNACES FOR STEAM BOILERS AND OTHER PURPOSES," upon
the condition (amongst others) that I, the said Ellis Butterworth, my
executors or administrators, by an instrument in writing under my,
or their, or one of their hands and scals, should particularly describo
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 imme-
diately after the date of the said Letters Patent.
NOW KNOW YE, that I, 'the said Ellis Butterworth, do hereby
declare the nature of the said Invention, and in what manner the
same is to be performed, to be particularly described and ascertained in
and by the following statement and accompanying Drawings (that is to
say)
My Invention relates to that class of furnaces in which a progressive
motion is given to the fuel, and in which hollow grate bars through
which water circulates are used, and consist,-
Firstly. In feeding the fuel into the furnace by means of sliding plates,
reciprocative plungers, or other means which cause the fuel to pass on
to the hollow grate bars without the intervention of sliding grate bars,
and I propose to carry the fire along the hollow bars by means of plain
scalers or scalers without teeth.
Secondly. In feeding the fuel on to or into the mass of burning fuel
at a distance above the grate bars.
Thirdly. In forming the sliding feed plates so as to overlap each other
and bolting fixtures on the sides of the furnace to prevent the fucl
falling when passing into the furnace.

page_text: Fourthly. In making the tubular bars flat, or nearly so, on the top
where the fuel rests, and round at the ends where they are fastened to
the boxes which convey the water to and from them. These boxes I
make of wrought or of malleable cast iron, steel, copper, or brass
45
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In order that the Invention may be better understood and explained
in detail, I have hereunto attached a Sheet of Drawings to illustrate the
samo.
Figure 1 represents a longitudinal section of a boiler and furnace to
which the sliding feed plates and plain scalers are applied; a, a, is the
boiler; b, b, the flue of the boiler, c, c, the framework of the furnace,
d, the first-motion shaft of the furnace; e, e, are crank shafts which are
driven from the first motion shaft in the usual way On these crank
shafts are mounted the arms f which by means of rods g carries the
scalers which pass up between the hollow fire-bars These scalers
are made of plain sheet iron or other material about the thickness of
No 14's wire gauge
When the cranks e are at the top centre, as :
shown, the top edge of the scalers h are pushed up between the fire-bars
into the fire, and when the cranks pass to the bottom centre they carry
the scalers along and lower them out of the fire, k (see also Figure 2,
which is a plan view) are stationary fire-bars, one end of which rests on
the water box 7, and the other rests on projections formed on the cross:
rail m.
On each side of these fire-bars are the sliding feed plates n
and o (a sectional view of which are shewn in Figure 3), one end of the
plates n rest on the plates o (see Figure 3) and the other] on the cross
rail (see Figure 1) which moves backwards and forwards in the usual
manner. These plates move 3 to 4 inches and make about 30 strokes
per minute, sometimes more and sometimes less, according to the fuel
and the draft. When the plates n move towards the plates o they carry
the fuel out of the hoppers and push it on the plates o. These plates o
(one end of which rests on the water box and the other on the cross
rail 2) also move backwards and forwards, and when they move towards
the water box / they carry the fuel along with them and push it on the

page_text: the silent feed. I claim the use of this motion in all furnaces in which
a progressive motion is given to the fuel.
In witness whereof, I, the said Ellis Butterworth, have here-
unto set my hand and scal, this Eighth day of October, in
the year of our Lord One thousand eight hundred and seventy-
five.