Improvements in Apparatus for Regulating the Admission of Air to Furnaces and other Fireplaces.
Year: 1897

page_text: Date of Application, 22nd Apr., 1897
Complete Specification Left. 22nd Jan., 1898-Accepted, 19th Mar.,
1898
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Regulating the Admission of Air to
Furnaces and other Fireplaces.
We, JAMES DICKSON, of Waverley Works, Effingham Road, City of Sheffield,
Manufacturer, and WILLIAM NICHOLSON, 98, Chippingham Street, City of Sheffield,
Engineer, do hereby declare the nature of our invention to be as follows:-
Our invention relates to improvements in apparatus for admitting and shutting
off a supply of air to furnace fires and like fires, automatically.
It consists of a frame fitted with a number of pivotted louvres capable of being
rotated so as to open or close the opening or central portion of the frame, the said
frame may form part of the furnace door, or may be affixed thereto.
Connected with the frame is a small cylinder fitted with a piston and a rod
which projects from the cylinder; a small pipe provided with a tap, forms a
communication between the upper and the lower ends of the cylinder, and a hole in
the cylinder cover having a screw stopper enables the cylinder to be filled with
a suitable liquid. The piston rod engages with one end of a lever pivotted to a
support carried by the cylinder, the other end being arranged to be pressed down
(and thus raise the piston) when the furnace door is opened, by coming in contact
with a fixed arm or projection.
A finger or pin projects from the piston rod and engages with the bottom louvre
plate, and the upper louvres are so formed or connected that they are raised and
lowered by the action of the bottom louvre, opening and closing the entrance for
the air supply into the furnace simultaneously.
The action of the apparatus is as follows:
When the furnace door is opened and swings back to allow the stoker to put
on a supply of coal, the pivotted lever comes in contact with the fixed arm and
is pressed down, raising the piston and opening the louvres to their full extent.
The liquid which was all in the upper part of the cylinder, passes through
comparatively large valves in the piston into the lower portion of cylinder under
the piston.
The furnace door being closed, the weight of the piston acts upon the liquid
and forces it slowly through the pipe and tap, which can be regulated as desired,
back again into the cylinder above the piston, until the piston has gravitated to
the bottom and is at rest, the louvres at the same time will be closed.
We are aware that a frame with louvres for admitting air has been used, and
we therefore do not claim these parts broadly as of our invention.
D
15th dal 1907

page_text: Improvements in Apparatus for Regulating the Admission of Air to
Furnaces and other Fireplaces.
We, JAMES DICKSON, of Waverley Works, Effingham Road, City of Sheffield,
Manufacturer, and WILLIAM NICHOLSON, 98, Chippingham Street, City of Sheffield,
Engineer, do hereby declare the nature of this invention and in what manner
the same has to be performed, to be particularly described and ascertained in and by
the following statement: --
Our invention relates to improvements in apparatus for admitting and shutting
off a supply of air to furnace fires, and to other like fires, automatically.
It is illustrated in the annexed sheets of drawings, in which similar letters refer
to similar parts in any of the several figures.
.
J
Fig. 1, is a front elevation of the apparatus.
Fig. 2, is a side elevation of same.
Fig. 3, is a vertical section of the cylinder showing the piston partly in section.
Fig. 4, two views of operating lever.
The apparatus consists of a frame A, fitted upon the fire door of a furnace and
provided with a number of louvre plates B. capable of partial rotation upon their
axes, by which they are supported at each end in grooves formed in the frame
while in the centre of each louvre plate is a rounded projection C, which engages
with the one above and below it in such a manner that when the lowest plate is
raised by rotation it raises all those above it, and when it is lowered those above it
descend by gravitation.
Below the louvre plates is a small cylinder D, fitted with a piston E, and piston
rod F, the piston is provided with valves G, one of which is shown in Fig. 3, and
the piston rod at its upper end has a projecting finger H, which passes under the
part C, of the bottom louvre plate, see Fig. 2.
A pipe I, provided with a tap J, forms a means of communication between the
upper and lower parts of the cylinder, the speed of transmission being controlled
by the angle of the tap passage K.
The evlinder is supplied with liquid, preferably oil through an opening in the
cylinder cover L, which may be closed with a screw M, as shown.
A lever N, is pivotted upon a support 0, which may form one of the cylinder
cover bolts, this lever is shown complete in Fig. 4.
Its double forked end passes on each side of the piston rod, the side forks
engaging with the projecting finger H, as seen in Figs. 1 & 2, and its cranked end
is arranged to be acted upon by coming in contact with a suitable projection when
the furnace door is opened. The end of the lever N, and the arm or other projection
fixed to the boiler front may be varied to suit the different constructions of boiler
fronts and doors. The lever may be pressed down by hand if preferred.
The apparatus being in working order and the cylinder charged with oil, the
furnace door shut and the louvres closed, the modus operandi is as follows: When
the furnace door is opened, and swung back to permit the stoker to put on a supply
of fuel, the end of the lever N, comes in contact with the projection before mentioned
as being suitably located and fixed upon the boiler front at the hinged side of the
door and is pressed down, causing the forked end to he raised, and thereby lifting
the piston rod F, and piston E, the finger H, at the same time raising all the
louvres and admitting the full supply of air.
During this operation the oil which was on the upper side of the piston, passes
through the valves G, which are retained in their closed position by light
springs P, and fills the lower end of the cylinder D.

page_text: The stoker now closes the furnace door, and the weight of the louvres and the
piston commences to act upon the oil by gravitation, forcing it to flow through
the pipe I, and tap J, into the upper part of the cylinder, the piston and the
louvres descending until they reach their normal or closed position.
The time occupied by this closing operation is regulated by the size of the
passage through the tap, which can be varied at pleasure in any degree between
full open, and closed.
We are aware that a frame with louvre plates worked by hand has been proposed
to be used and we therefore do not claim these parts broadly, but, 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:-
1. An apparatus for admitting air to furnace fires and other fires, and auto-
matically regulating the supply and shutting off same; constructed and operating
as herein before described, and as shown in the drawings.
2. An apparatus for admitting a supply of air to the fires of boiler furnaces
and other fires, and for regulating the amount and shutting off the supply,
consisting of a set of pivotted plates B, for closing the inlet, in combination
with a cylinder D, piston E, fitted with valves G, rod F, and finger H, communi-
cating pipe I with tap J, the opening action being accomplished by a lever N,
in conjunction with a suitably formed projecting arm or its equivalent, and the
closing by gravitation, substantially as herein before described and shown.
3. In an apparatus for admitting air to fires for a pre-arranged time, the inlet
being opened either by hand or automatically as preferred, a cylinder to contain
a liquid such as oil, having a piston and suitable valves therein to permit the
liquid to pass from the upper to the lower side of the cylinder, and a passage
with a tap or other regulator, to permit its return to the upper side of the piston,
and a piston rod with means for raising and supporting the bars, plates or other
appliances by which the inlet is closed gradually, as herein before described and
set forth.
7
قيقيد
1
T
1000
ROBT. F. DRURY,
Agent for Applicants.