IMPROVEMENTS IN THE FIRE BOXES OR DA.OR FURNACES OF LOCOMOTIVE ENGINE BOILERS
Year: 1857

page_text: LETTERS PATENT to John Chanter, of Bow Road, in the County of
Middlesex, and John Wakefield, of Suchicore, in the County of Dublin,
Engineer, for the Invention of "IMPROVEMENTS IN THE FIRE BOXES OR
DA"
Scaled the 24th April 1857, and dated the 10th January 1857.
PROVISIONAL SPECIFICATION left by the said John Chanter and John
Wakefield at the Office of the Commissioners of Patents, with their
Petition, on the 10th January 1857.
We, JOHN CHANTER, of Bow Road, in the County of Middlesex, and JOHN
WAKEFIELD, of Suchicore, in the County of Dublin, Engineer, do hereby
declare the nature of the Invention for "IMPROVEMENTS IN THE FIRE BOXES.OR
FURNACES OF LOCOMOTIVE ENGINE BOILERS," to be as follows:-
This Invention has for its object improvements in the fire boxes or furnaces
of locomotive engine boilers. For these purposes, in order to admit of coal
being burned in the fire boxes or furnaces of locomotive engine boilers, and yet
prevent the passage away of smoke from such furnaces or fire boxes, the water
spaces at the sides, back, and front are made with tubular openings through
them to admit air to the fire on the fire bars, and also above the fuel on the
fire bars, so as to pass into the fire box to mix with the products rising from
the fire. In order to maintain a draft through the flues when the locomotive
engine is standing still, a steam pipe with a cock is used, to admit steam from
the boiler to the chimney. In order to keep the bottom of the fire free from

page_text: clinkers and ashes, reciprocating or moving bars are used, which when desired
are put in motion by the. engine man or stoker by means of two handles,
which by connecting rods give motion to a rocking shaft, which by other
connecting rods give motion to a second rocking shaft, which gives motion to
the reciprocating or moving bars; and in order that the fire may be discharged,
the furnace or fire bars are also so arranged that they may be made to drop at
one end and be again raised and held in position for use.
SPECIFICATION in pursuance of the conditions of the Letters Patent
filed by the said John Chanter and John Wakefield in the Great Seal
Patent Office on the 10th July 1857.
TO ALL TO WHOM THESE PRESENTS SHALL COME. wc, JOHN
CHANTER, of Bow Road, in the County of Middlesex, and JOHN WAKEFIELD,
of Iuchicore, in the County of Dublin, Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Tenth day of January, in the year of our Lord One
thousand eight hundred and fifty-seven, in the twentieth year of Her reign,
did, for Herself, Her heirs and successors, give and grant unto us, the said
John Chanter and John Wakefield, Her special licence that we, the said John
Chanter and John Wakefield, our executors, administrators, and assigns, or
such others as we, the said John Chanter and John Wakefield, our 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 "IMPROVEMENTS IN THE FIRE BOXES OR FURNACES OF LOCOMOTIVE
ENGINE BOILERS," upon the condition (amongst others) that we, the said John
Chanter and John Wakefield, our executors or administrators, by an instru-
ment in writing under our or their hands and seals, or under the hand and seal
of one of us or them, should particularly describe 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 immediately after the date of the said Letters
Patent.
NOW KNOW YE, that I, the said John Chanter, on behalf of myself
and the said John Wakefield, do hereby declare the nature of the said Inven
tion, and in what mauner the same is to be performed, to be particularly

page_text: described and ascertained in and
say:
the following statement thereof, that is to
This Invention has for its object improvements in the fire boxes or furnaces
of locomotive engine boilers. For these purposes, in order to admit of coal
being burned in the fire boxes or furnaces of locomotive engine boilers, and
yet prevent the passage away of smoke from such furnaces or fire boxes, the
water spaces. at the sides, back, and front are made with tubular openings
through them to admit air to the fire on the fire bars, and also above the fuel
on the fire bars, so as to pass into the fire box to mix with the products rising
from the fire. In order to maintain a draught through the flues when the
Jocomotive engine is standing still, a steam pipe with a cock is used, to admit
steam from the boiler to the chimney. In order to keep the bottom of the
fire free from clinkers and ashes, reciprocating or moving bars are used, which
when desired aro put in motion by the engine man or stoker by means of
handles, which by connecting rods give motion to a rocking shaft, which by
other connecting rods give motion to a second rocking shaft, which gives
motion to the reciprocating or moving bars; and in order that the fire may be
discharged, the furnace or fire bars are also so arranged that they may be
made to drop at one end and be again raised and held in position for use.
Ilaving thus stated the nature of our said Invention, we will proceed to
describe more fully the manner of performing the same.
:
DESCRIPTION OF THE DRAWING.
3
Figure 1 shows a part of a longitudinal section of a firo box; Figure 2
shows a transverse section; and Figure 3, plan in section, of a locomotive
engine fire box constructed and arranged with apparatus according to our
Invention. a*, a*, are air passages through the water spaces at the sides,
back, and front of the fire box of a locomotive engine boiler. These passages
are formed of tubes, which are fixed at their ends to the outer and inner plates
of which the fire box is constructed; hence such tubes act as stays and give
strength to these parts. By thus applying air through such constructions of
fire boxes on all sides, and above as well as below the burning fuel in the fire
box, coals may be more freely burned in locomotive engine, fire boxes; we do
not, however, make any claim to such air passages. In order to insure the
burning of the fire when a locomotive engine is at rest, we, in addition to the
ordinary apparatus for getting a draft through the chimney by jets of steam,
apply a pipe having a cork or valve therein, by which steam from the boiler
may be admitted to the chimney during the time that the locomotive engine is
at rest; at other times the cock or valve may be kept closed. We would state

page_text: that we make no claim to the use of such additional steam pipe. Moveable or
reciprocating bars have before been extensively employed in various con-
structions of furnaces; in some cases the alternate bars move in opposite
directions, whilst in other arrangements the alternate bars are stationary whilst
the intermediate bars are only made to reciprocate; and we prefer in carrying
out our Invention to use the latter arrangement, though that is not essential.
In applying reciprocating fire bars to locomotive engine fire boxes, it is
necessary so to arrange and work the apparatus connected with reciprocating
fire bars that they may be able to discharge the fire therefrom. a, a, are the
moveable fire bars, and b, b, are the alternate stationary bars. The moveable
bars have projections a, a, at their under sides, between which the raised pin
or projection on a rocking shaft centers. On the shaft c is a crank d, which
by means of a rod e is connected to the lever handle f; here the engine man or
stoker can at any time communicate a reciprocating motion to the bars a, a,
and thus cleans the lower part of the fire by breaking up the clinkers formed
on the bars. The frame g, g, which carries the fire bars a and b, is arranged
in a suitable manner to admit of the bars being caused to assume an inclined
position. g, g', are arms of the frame g, which at their outer ends are attached
by rods h, h, to arms i, i, on the axis j, as shown; is a screw shaft, which
passes through a screw nut l, which moves freely on axes carried by the forked
arm n on the axis j. The screw shaft turns freely in and is supported by the
fixed bearing m, and motion is given thereto by the cranked handle n¹.
Having thus described the nature of our said Invention, and the manner of
performing the same, we would have it understood that we make no claim to
any of the mechanical parts separately, nor do we confine ourselves to the
details; but what we claim is, the combined apparatus for applying reciprocating
fire bars to the fire boxes of locomotive engines.
In witness whereof, I, the said John Chanter, have hereunto set my hand
and seal, this Ninth day of July, in the year of our Lord One thousand
eight hundred and fifty-seven.
Witness,
J. G. TONGUE.
JOHN CHANTER. (L.S.)