IMPROVEMENTS IN THE CONSTRUCTION OF FURNACES OR FIRE GRATES "
Year: 1882

page_text: LETTERS PATENT to George Frederick Janes of Finsbury in the County of
Middlesex for an invention of "IMPROVEMENTS IN THE CONSTRUCTION OF
FURNACES OR FIRE GRATES
"
PROVISIONAL SPECIFICATION left by the said George Frederick Janes
at the Office of the Commissioners of Patents on the 27th May 1882.
GEORGE FREDERICK JANES of Finsbury in the County of Middlesex "IMPROVE-
MENTS IN THE CONSTRUCTION OF FURNACES OR FIRE GRATES
دو
This Invention relates to improvements in the construction of furnaces or fire
grates and has for its object to produce perfect, or nearly perfect, combustion
combined with total prevention of smoke and a great economy in the consumption
of fuel
.
To carry out my invention I proceed as follows:-I make two boxes of cast iron
or other suitable metal, hereafter termed the front and back boxes; the front box
being constructed to receive the fore ends of the furnace bars while the back box
serves to carry their rear ends
The furnace bars are made hollow, of a V shape and faced with margin pieces, so
arranged that suitable openings or apertures are left between them in order to
conduct the air to the fuel when placed thereon
Fitted underneath the front box in suitable bearings are two wrought iron spindles
corresponding in length to the width of the furnace and having hand levers attached
thereto by which they are moved to and fro
A toothed flange is cast on the top of each spindle while suitable recesses are
formed in the bottoms of the fore ends of the furnace bars to allow of their fitting
over such flanges and riding upon the same as the spindles are moved to and fro.
By this improved arrangement the furnace bars,-(with the exception of the top
and bottom bars, which are rigidly fixed :)—become sliding bars, the bars and
flanges being so arranged and fitted that by moving one of the hand levers
backwards or forwards a corresponding motion is imparted to one half of the

page_text: series of bars while by moving the other hand lever in the opposite direction a
contrary motion is imparted to. the other half of the series, thus effectually
providing for the removal of clinkers and scoria, and keeping the air passages
between the bars free from choking by which perfect or nearly perfect combustion
is materially assisted
The front box of the furnace forms a hollow chamber and is fitted with a suitable
door or valve or doors or valves-(preferably two doors)-to regulate the admission
of air to the furnace; such doors or valves being made to open either vertically or
horizontally as most convenient
On the back of the ordinary furnace door I cast or otherwise form a valve
chamber, fitted with a suitable damper to regulate or close the same as required
Such ordinary door is so fixed that it opens and shuts on the top of the dead
plate which is above the doors or valves already mentioned, and which dead plate
forms the top plate of the front box
I likewise fit a suitably shaped hood plate on the back of such ordinary furnace
door just above the valve chamber last described, in order to confine the air
admitted through such chamber and ensure its striking downwards upon the
furnace thus augmenting the combustion
I cast or otherwise form on the underside of the said dead plate a serrated
draught plate for supplying a longitudinal current of air to the furnace-Or when
desirable I employ a shifting grating in lieu of such fixed serrated draught plate
The back box forms a foundation whereon the bridge of the furnace rests placed
in any convenient position-I make such bridge either of fire brick or fire clay, or
of mineral cement made from asbestos and I mould openings or apertures in the
same if required
I fit the bottom of the furnace with two parallel iron bearers, extending the full
length of the furnace and having their front ends bolted or otherwise fastened to
the base plate of the front box while their rear ends rest on or are secured to the
base plate of the back box in such a manner as to allow of expansion
Mounted upon these bearers are two or more spacing plates which not only serve
to regulate the air spaces between the furnace bars; but also to support the same
while a roller mounted in suitable supports fastened to such bearers serves to assist
the backward and forward travel of the furnace bars
It will be obvious that my improved construction of furnace may be advan-
tageously employed as well for steam boiler furnaces as for other fire grates in
order both to obviate smoke and secure great economy in the consumption of fuel

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said George Frederick Janes in the Great Seal Patent Office on
the 27th November 1882.
GEORGE FREDERICK JANES of Finsbury in the County of Middlesex IMPROVE-
MENTS IN THE CONSTRUCTION OF FURNACES OR FIRE GRATES,
This Invention relates to improvements in the construction of furnaces or fire
grates for Lancashire and other boilers and has for its object to produce perfect or
nearly perfect combustion combined with total prevention of smoke and a great
economy in the consumption of fuel
And in order that my said invention may be better understood and readily
carried into effect I will now with the aid of the accompanying drawings, whereon
similar letters of reference indicate corresponding parts proceed more particularly
to describe and ascertain the same
Figure 1 shews a top plan view of my improved furnace
Figure 2 shews a plan view of the underside thereof
Figure 3 shews a view in front elevation thereof
Figure 4 shews a view in side elevation thereof
Figures 5 are detail views of the furnace bars
Figure 6 is a view of the back of the furnace door shewing the valve chamber,
damper and deflecting plate presently referred to
To carry out my invention I proceed as follows:-I make two boxes of cast iron
or other suitable metal (hereafter termed the front and back boxes:-) the front
box a being constructed to receive the fore ends of the furnace bar c while the
back box b serves to carry their rear ends.
The furnace bars are made hollow-of a V shape-and faced with margin
pieces d so arranged that suitable openings or apertures e are left between them in
order to conduct the air to the fuel when placed thereon.
Fitted underneath the front box in suitable bearings f are two wrought iron
spindles g. g¹ corresponding in length to the width of the furnace and having hand
levers h. h. attached thereto by which they are moved to and fro
A toothed flange i is cast on the top of each spindle while suitable recesses ; are
formed in the bottoms of the fore ends of the furnace bars to allow of their fitting
over such flanges and riding upon the same as the spindles are moved to and fro
while they are further supported and assisted in their travel by a revolving centre
bar k
By this improved arrangement the furnace bars-with the exception of the two
outside bars kk', which are rigidly fixed)-become sliding bars, the bars and flanges
being so arranged and fitted that by moving one of the hand levers backwards or
forwards a corresponding motion is imparted to one half of the series of bars while
by moving the other hand lever in the opposite direction a contrary motion is
imparted to the other half of such series, thus effectually providing for the removal
of clinkers and scoria and keeping the air passages between the bars free from
choking and so materially assisting in producing perfect or nearly perfect
combustion
The front box of the furnace forms a hollow chamber and is fitted with a suitable
door or valve or doors or valves a¹ a¹. (preferably two) to regulate the admission of
air to the furnace; such doors or valves being made to open either vertically or
horizontally as most convenient
The front plate of the ordinary furnace door has suitable perforations or
openings made therein while I cast or otherwise form a valve chamber fitted
with a suitable damper to regulate or close the same as required.

page_text: Such ordinary door is so fixed that it opens and shuts on the top of the dead
plate m which is above the doors or valves already mentioned and which dead
plate forms the top plate of the front box
I likewise fit a suitably shaped deflecting plate n. on the back of such ordinary
furnace door just above the valve chamber last described in order to confine the
air admitted through such chamber and ensure its striking downwards upon the
furnace thus augmenting the combustion
Cast or otherwise formed on the underside of the said dead plate is a serrated
draught plate o for supplying a longitudinal current of air to the furnace :-Or
when desirable I employ a shifting grating in lieu of such fixed serrated draught
plate,
The back box forms a foundation whereon the bridge of the furnace rests placed
in any convenient position as indicated in Figure 4
I make such bridge either of fire brick or fire clay or of mineral cement made
from asbestos and I mould openings or apertures, or both, therein if required
Having thus fully described my said invention and the manner of carrying the
same into operation I would have it understood that what I claim as novel and of
my invention is
The improved construction of furnace or fire grate substantially as hereinbefore
described and shewn.
In witness whereof I the said George Frederick Janes have hereunto set my
hand and seal this twenty fifth day of November in the year of Our
Lord One thousand eight hundred and eighty two.
GEORGE FREDERICK. JANES (L.S.)