Improvements in and connected with Furnaces.
Year: 1892

page_text: Date of Application, 20th July, 1892
Complete Specification Left, 20th Apr., 1893-Accepted, 27th May, 1393
PROVISIONAL SPECIFICATION.
Improvements in and connected with Furnaces.
I, ERNEST WILLIAM STEVENS, of St. James's Foundry Taunton in the County
of Somerset Engineer, do hereby declare the nature of this invention to be as
follows:-
My invention has reference to that class of furnace connected with the system
of heating which is sometimes known as Perkins' high pressure system it is also
used for other furnaces such as are used for heating greenhouses conservatories and
steam baking ovens.
In the arrangement of the furnaces hitherto in use considerable difficulty and
inconvenience arises from the method of constructing the firegrate inasmuch as
the extraction of clinker cinders and ashes is a difficult and laborious operation and
the renewal of the fire-bar bearings and grate necessitates extensive and costly
repairs to obviate the before mentioned difficulties which occur in the old arrange-
ment of furnace in connection with the high pressure hot water system I construct
my furnace in manner as hereinafter described.
.
Round the inside of the coil case and attached to the sides or supported in any
other desirable manner is an inside flange bracket or shelf hereinafter called coil-
bracket which is of such dimensions as will support the fire brick and the furnace
tubes or either of same attached to this coil bracket by suitable bolts rivets pins or
other devices is a dished wrought or cast iron fire box extending to a pre-arranged
distance below the coil bracket at the bottom of the fire box is placed in a horizontal
inclined or any other required position fire bars or gratings upon which the fuel
burns the fire bars may also be arranged so that by giving them motion from the
outside of the casing or from a suitable arrangement in the ash pit a certain
rocking circular or other motion which will tend to free the fire-bars from any
clinker ash or other obstruction to the passage of air through the fire-bars.
In connection with the fire-box is arranged a fire door which may either slide
upon a prepared face or may be hinged and in this fire door may be placed a sliding
or other valve for the passage of air over or through the fuel and also a piece of
talc" or other suitable material through which the state of the fire may be seen
without opening the fire-door.
The fire-box is slid into its position upon runners which may be made of angle
iron or other suitable shaped pieces of metal when the fire box requires renewal a
plate attached to the front of the casing by bolts is taken off and the whole of the
fire box is slid out and can be at once replaced by a new one which is slid in and
the outside plate replaced the usual ash pit door is fitted to the ash pit of the
furnace.
The casing immediately outside the fire-brick may be surrounded at some pre-
arranged distance by another casing of metal the space between these two casings,
will hereinafter be called the "jacket" air is drawn in through the jacket and thus
keeps the outside casing cool and heats air for supplying the fire thus causing an
economy of fuel.
Instead of air being introduced as before in the jacket it can be made water-tight
and used for heating by low pressure or any other required purpose.
Dated this 18th day of July 1892.
W. M. LLEWELLIN, C.E.,
15, King Square, Bristol, Agent for the Applicant.

page_text: Improvements in and connected with Furnaces.
ERNEST WILLIAM STEVENS of St. James's Foundry Taunton in the County
of Somersetshire 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 certain improvements in the construction of furnaces
that are used for heating water in that system of high pressure hot-water circu-
lation that is known by the name of the inventor as Perkins' hot water system. The
invention may also be used for any other system of heating by hot water circulation
when such a furnace as is used by Perkins is employed.
I annex hereto one sheet of explanatory drawings which are to be read herewith
and taken as part of these presents & I have marked the same with letters of
reference so that like letters of reference are for corresponding parts in each
drawing.
Figure 1 Sheet 1 is a sectional elevation of a furnace employed for the high
pressure system of circulation showing my improved fire box as used in the ordinary
high pressure furnace which furnace will be hereinafter referred to as Perkins
furnace.
Figure 2. Sheet 1 shows the shell or casing of the furnace and an air-case lining
by means of which I use the radiant heat from the furnace casing or shell for
warming the air which is used for the purpose of burning the fuel in my new
arrangement of fire box and also for other purposes hereinafter stated.
On referring to Figure 1 Sheet 1.
A is the outside casing or shell which will be hereinafter referred to as casing.
Dis a bearing ledge running either continuously round the inside casing or pro-
jecting at intervals from the inside casing, C is a plate resting on and supported
by the bearing-ledge D which supports the fire brick setting in which the iron
coils B are set the water circulating through the said coils B. is heated to the
required temperature by fuel burning on the bars G, E is an angular bracket piece
extending along the three sides viz. the backside and the two long edges of the
top outside of the fire box F. and thus keeps the fire box in position and when
required allows the fire box to slide in the angle piece E it will be observed that
the top outside edge S of the fire box is bent or curved in such a manner as to
engage in the angle piece E, G are the fire-bars which rest on the recessed portion o
in the bottom of the fire box F attached by suitable fastenings to the front or
external part of the fire box is the fire door plate H which when secured by
suitable fastenings to the casing A keeps the fire box in position, J is the ash-hole
door which gives access to the ash-pit T, it will thus be seen that from the arrange-
ment of parts hereinbefore described that in the event of any repairs or other
matters being required done in the fire-box it may by unloosening the screws
which attach the fire-door plate H to the casing A the whole of the firebox may
be withdrawn from out the casing A. I is the fire-door.
Figure 2. Sheet 1. shows the casing A surrounded by an air-tight jacket L to
which air however may be admitted and regulated through the air-trunks M by
means of the valve N or may also be admitted through grilles situated in any
required part of the air jacket the air jacket is divided off from the ash-hole door by
means of partitions but the ash hole door J is however cased in access to the
casing and also to the ash-hole door is had by means of the air-door K. Hot air
can be drawn into the ash hole door casing Li through the valve P from the casing L
and passed underneath the bars for the purpose of supplying air for the combustion
of fuel. It will thus be seen that the air jacket may serve a three-fold purpose it
may supply heated air for the more economical combustion of the fuel it may

page_text: supply warm air by means of the trunks M for any required purpose and by
circulating cold air around the casing A will tend to keep the place where the
furnace is situated in a cool condition.
In this class of furnace fuel is usually introduced through an aperture in the top
but for the purposes of my invention this needs no description.
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
1. I claim the making of a fire box detachable at will from the casing in the
manner as hereinbefore described.
2. I claim the arrangement of the parts of the fire box in the manner as
hereinbefore described.
3. 1 claim making the fire box independent and separate from the plate that
supports the coil and fire brick setting.
4. I claim surrounding the casing with an air jacket in the manner as herein before
described.
5. I claim the method of the introduction of heated air from the said air
jacket to the fuel for the purpose of increased or more economical combustion of
the fuel.
6. I claim furnishing by means of the air jacket a supply of hot air for any
other required purpose.
7. I claim by means of circulating air in the air jacket the keeping the place
in which the furnace may be situated at a lower temperature than it otherwise
would be without the said air-jacket.
Dated this 19th day of April 1893.
W. M. LLEWELLIN, C.E.,
15, King Square, Bristol, Agent for the Applicant.