Improvements in Means for Mechanically Firing Furnaces.
Year: 1892

page_text: Date of Application, 2nd July, 1892
Complete Specification Left, 4th Apr., 1893—Accepted, 6th May, 1893
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PROVISIONAL SPECIFICATION.
Improvements in Means for Mechanically Firing Furnaces.
I EDWARD JAMES NEWITT of 14 Albert Square, Stockwell, in the County
of Surrey, Engineer, do hereby declare the nature of this invention to be as
follows:-
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This invention relates to that class of mechanically fired furnaces in which the
fuel is discharged from a hopper secured on the front of the boiler. The object of
this invention is to provide furnaces of this description with new or improved
means for supplying the fuel to the grate intermittently, and of regulating the
supply.
In carrying my invention into practice I make the lower part of the coal hopper
in the form of a segment of a circle and outside this I fit a similarly curved
seginental damper or shut off plate which I pivot to the outside of the furnace front
in such a manner that it can be rotated over the bottom of the hopper. The said
segmental damper or shut off plate passes through an aperture which I make in the
front of the furnace purposely to receive it and in one position comes immediately
beneath the discharge of the hopper and effectually prevents the passage of fuel
from the hopper to the fire grate. The front of the segmental damper or shut off
plate, or that part which is within the furnace is preferably provided with a down-
wardly inclined plate or lip which serves to project the falling fuel away from the
vertical and towards the rear of the fire grate as and when the fuel falls from
the hopper. That part of the segmental damper or shut off plate which is outside
the furnace, is provided with a toothed wheel or wheels or curved racks with which
gear pinions preferably secured to a shaft running transversely across the front of
the furnace. Any suitable means may be adopted for alternately rotating this
shaft in opposite directions sufficiently to allow the damper to alternately shut off
and open the discharge aperture in the bottom of the hopper, but I prefer to open
the discharge by means of a constantly rotating cam shaft, and to shut off by means
of a spring or counterpoise which returns the segmental damper to its initial or
shut off position.
To regulate the quantity of fuel falling from the hopper, I provide suitable
means for varying the distance through which the pinions may rotate and the
period of time during which the segmental damper is required to be opened.
When my invention is used in a furnace, the bars of which receive longitudinal
to and fro motion, I prefer to arrange the feeding mechanisin in such manner as to
secure unison of motion between the mechanical feed and the moving bars.
Dated this 2nd day of July 1892.
F. W. GOLBY,
36, Chancery Lane, London, W.C., Patent Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Means for Mechanically Firing Furnaces.
I EDWARD JAMES NEWITT of 14 Albert Square Stockwell in the County of
Surrey, Engineer, 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:—
This invention relates to that class of mechanically fired furnaces in which the

page_text: fuel is discharged from a hopper secured on the front of the boiler. The object
of this invention is to provide furnaces of this description with new or improved
means for supplying the fuel to the grate intermittently and of regulating the
supply.
The accompanying drawing shews a section of a boiler front fitted with a fuel
hopper constructed in accordance with this invention.
In carrying my invention into practice I make the lower part of the coal
hopper A curved preferably in the form of a segment of a cylinder or sphere, as
shewn at B, and outside this I fit a similarly curved segmental damper or shut off
plate C which 1 pivot to the outside of the furnace front in such a manner that it
can be rotated over the curved bottom B of the hopper. The said segmental
damper or shut off plate C passes through an aperture which I make in the front
of the furnace purposely to receive it and in one position comes immediately
beneath the discharge of the hopper and effectually prevents the passage of fuel
from the hopper to the fire grate. This is the position shewn in the drawing.
It will be obvious that when the segmental plate Ċ is drawn outwards the mouth
or discharge aperture in the bottom of the hopper will be uncovered or partially
uncovered and the fuel will then fall on to the grate.
The front of the segmental damper or shut off plate C or that part which is
within the furnace is preferably provided with a downwardly inclined plate or lip D
which serves to project the falling fuel away from the vertical line and towards the
rear of the fire grate as and when the fuel falls from the hopper. That part of the
segmental damper or shut off plate C which is outside the furnace, may be provided
with a toothed wheel or wheels, or curved racks may be fixed on its periphery with
which gear pinions preferably secured to a shaft running transversely across the
front of the furnace. Any suitable means may be adopted for alternately rotating
this shaft in opposite directions sufficiently to allow the damper C to alternately
shut off and open the discharge aperture in the bottom of the hopper, but I prefer
to open the discharge by means of a constantly rotating cam shaft, and to shut off
by means of a spring or counterpoise which returns the segmental damper to its
initial or shut off position.
To regulate the quantity of fuel falling from the hopper, I provide suitable
means for varying the distance through which the pinions may rotate and the
period of time during which the segmental damper is required to be opened.
When my invention is used in a furnace, the bars of which, receive longitudinal
to and fro motion, I prefer to arrange the feeding mechanism in the manner shewn
in the drawing so as to secure unison of motion between the mechanical feed and
the moving bars.
is a rod (more than one may be used if required) pivotted at F to the segmental
plate C, and working in suitable guides, and G is the shaft from which the motion
of the fire bars is taken. H is a cam or tappet on the shaft G engaging a notch J
or recess in the lower end E¹ of the rod E. When the shaft G is rotated the cam
or tappet H raises the rod E thereby drawing the segmental plate C outwards and
allowing the fuel to fall onto the grate. When the cam or tappet H has passed
under the rod, the latter falls either by its own weight, or a weight or counterpoise
may be secured to it or to the segmental damper C.
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 :-
For mechanically fired furnaces means for feeding the fuel to the grate, consisting
of a hopper with a segmental, cylindrical, spherical, or curved bottom with a
similarly curved damper or shut off plate pivotted on the outside of the curved
bottom of the hopper, and passing through an aperture in the front of the furnace,
with means for turning said curved damper or shut off plate on its pivots so as to
alternately open and shut off the discharge aperture or mouth of the hopper

page_text: substantially
drawing.
as hereinbefore described and illustrated in the accompanying
Dated this 4th day of April 1893.
F. W. Golby,
EDW. J. NEWITT.
36, Chancery Lane, London, W.C., Patent Agent for the Applicant.