IMPROVEMENTS IN APPARATUS FOR REGULATING THE COMBUSTION IN STOVES AND FURNACES
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
We CHARLES PATULLO KINNELL Engineer of 31 Bankside Southwark S.E. in
the County of Surrey and GEORGE ROTHNIE Engineer of 21 Elthorne Road Upper
Holloway in the county of Middlesex do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN APPARATUS FOR REGULATING THE COMBUSTION
IN STOVES AND FURNACES" to be as follows:
The opening or openings for admission of air into the furnaces are provided
with a valve or plate mounted on pivots or otherwise, and regulated by a spring
or counterbalance weight-by which means the amount of air gaining access, to
the furnace to support combustion is controlled, the opening or openings being
automatically increased or decreased according to the state of fire thus securing a
regular and steady rate of combustion so long as the fuel lasts.

page_text: I CHARLES PATULLO KINNELL Engineer of 31 Bankside Southwark S.E. in
the county of Surrey and GEORGE ROTHNIE Engineer of 21 Elthorne Road,
Upper Holloway N. in the county of Middlesex do hereby declare the nature of
our invention for REGULATING COMBUSTION IN INDEPENDENT HOT WATER &
HOT AIR STOVES OR ENCLOSED FURNACES, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:
The opening or openings made for the admission of air into the furnace are
provided with a self acting valve, or lid which automatically opens or shuts
according to the amount of draught, while an adjustable weight, spring or
expanding mouth piece, is fitted to determine the draught to be admitted as
required. A valve for the said purpose is constructed as follows:-an opening
(by preference of a rectangular form) and of sufficient size to admit the necessary
amount of air into the furnace, and fitted to the opening provided for that purpose,
a thin plate somewhat larger than the said opening is made having pivots on each
side near the bottom, these are carefully fitted and made to rest or turn freely on
bearings formed in the framework before mentioned. Balance weights (adjustable
when required) are attached to the said plate so that it may be made to open or
shut according to the amount of air pressing against it, and also the amount
desired to enter the furnace.
Another form is made by constructing the said mouth piece for the admission of
air, in such manner that the top or upper portion is made to project further
forward than the bottom portion, over this opening a plate is suspended by means
of flanges, 2 short chains, or other similar contrivance, the plate thus suspended
being left to hang perpendicularly over the opening, which leaves a wedge like
space between it and the frame; where the current of air passing into furnace
exceeds a certain velocity it draws the plate forward, and closes or partially closes
the opening until the draught is reduced. In order to determine the quantity of
air to be thus admitted or excluded, a moveable weight is attached to the plate,
or the mouth piece may be made to revolve or turn forward in order to increase or
diminish the opening between it and the plate as may be required.
A third form may be made having a similar framework as the first mentioned,
the pivots on the plate being at the top and bottom, on these or attached to them,
an adjustable spring is provided, this spring may be of a volute or heliacal form
and acting in a similar manner to the balance spring of a watch, means being
provided to regulate its action by increasing or diminishing its power.
In order that the said invention may be fully understood, we shall proceed more
particularly to describe the same, and for that purpose shall refer to the several

page_text: figures on the annexed sheet of Drawings, same letters of reference indicating
corresponding parts in all figures.
S
The three forms of this invention already referred to, are shown by figures 1. 2.
& 3 while figures 1° 2ª and 3ª are sections of the same on the lines X. Y.
Figures 1b 2b & 3b show some of the various methods of applying this invention
to Boilers and furnaces.
•
In Fig: 1. A represents a metallic frame or mouthpiece, having two projecting
lugs B B near the bottom corners, these are formed so as to carry the valve C. and
allow it to move freely backward and forward.
This valve or lid Č. which covers the opening in the frame is (by preference)
made of thin steel plate; weighted with lead along the bottom edge, see D.
The lower corners of this plate are cut away and sharpened forming pivots on
which it may turn on the bearings B B.
A small brass pin E provided with a screw thread and weighted at each end is
made to pass through the centre of the plate in a nut attached thereon.
The valve may be freely balanced thereby, or made to fall outward when
increased draught is desired.
In Fig 2. another method is illustrated; in which A represents a metallic
framework having bearings for the valve plate, near the top and bottom corners,
sce B. B. a thin plate of steel forms the valve plate C, this plate is mounted on a
tube D having a spiral spring inside, one end of which is attached to the tube,
while the other is fixed to a spindle E; mounted in the bearings B B the lower
end of this spindle is held by the screw F by means of which the valve may be
adjusted according to the amount of draught desired.
Fig 3. represents an arrangement like the first, the frame work and valve plate
being similar, the method of suspension and regulating being however different,
A represents the framework or mouthpiece having a projection around the
opening G. G. extending forwards, as shewn on section Fig: 34. This projection is
made double on the top and sides. The outer portion is mounted on pivots at H
and can be drawn forward, as shewn by the dotted lines I. I.-two hooks K K
fixed on this serve to hang by means of small chains L L, the valve plate C.
When the draught in the furnace exceeds a certain limit it draws the plate C
forward, and thus shuts the only opening into the fire, which has the effect of
checking the combustion, until such time as a reduced pressure on the valve allows
it to open again, and so revive the fire.
(This action is the same in all the methods described).
When a greater amount of draught is desired it is only necessary to draw the
mouth piece forward which increases the opening (see I I) and also the resistance
of the valve.
The position of the mouthpiece can be fixed by means of the screw M.
The Figs: 1b 2b 3b illustrate some of the various methods of applying this
invention to stoves or Furnaces.
Fig 1 shows this invention, applied to a Boiler, the fittings of which were
patented by us last year.
Fig 2 represents an ordinary furnace with 2 of these self acting valves built
into the brickwork.
Fig 3b shows a furnace the bottom door of which is provided with an opening Z
on which the valve No 3 may be fitted.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is
First. The application of a self acting valve or -lid, which will open or shut
automatically according to the amount of draught entering a furnace and so
regulate the amount of combustion as required, and

page_text: Second, In the adaptation to this of a method whereby a certain determined
amount only can enter the furnace-and
+ 3 >
Third. In the arrangement and construction of the said apparatus as heretofore
described and illustrated in the accompanying drawings.
Dated this 21st day of April 1885.
CHARLES PATULLO KINNELL.
GEORGE ROTHNIE.