Applicable also to Doors of Steam Boiler Furnaces.
Year: 1885

page_text: Applicable also to Doors of Steam Boiler Furnaces.
I, JOHN BOGG of 13, Colne Road, Aspley, Huddersfield, Yorkshire, Mechanic do
hereby declare the nature of my invention for "IMPROVEMENTS IN DRAW PLATES
FOR DOMESTIC FIRE RANGES, APPLICABLE
FURNACES," to be as follows:-
OF
ALSO TO DOORS
STEAM BOILER
Draw plates at present in use are made of one plate, and in some cases .it is
perforated so that atmospheric air can enter through the plate into the fire.
This method of allowing cold air to enter direct into the fire is objectionable.
My Invention consists in providing means whereby the atmospheric air will be
warmed before it enters the fire, consequently combustion of fuel is increased.
To carry out my Invention I cast a plate at the back of the draw plate so
placed as to leave a space between the two plates, such space being closed at the
sides but open top and bottom, so that cold air which enters at the bottom will
rise up between the two plates, and pass out at the top in a heated state, and
materially aid the combustion of fuel.
Furnace doors constructed in this manner would also aid in the combustion of
fuel and consumption of smoke.

page_text: Applicable also to Doors of Steam Boiler Furnaces.
I, JOHN BOGG, 13 Colne Road, Aspley Huddersfield, Yorkshire, Mechanic do
hereby declare the nature of my invention for IMPROVEMENTS IN DRAW PLATES
FOR DOMESTIC FIRE RANGES, APPLICABLE ALSO ΤΟ DOORS OF STEAM BOILER
FURNACES," and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
Draw plates at present in use are made of one plate and in some cases it is
perforated so that atmospheric air can enter through the plate into the fire.
This method of allowing cold air to enter direct into the fire is objectionable.
My invention consists in providing means whereby the atmospheric air will be
warmed before it enters the fire, consequently combustion of the fuel is increased.
To carry out my invention I cast a plate at the back of the draw-plate so
placed as to leave a space between the two plates, such space being closed at the
sides but open top and bottom, so that cold air which enters at the bottom will
rise. up between the two plates, and pass out at the top in a heated state and
materially aid the combustion of fuel.
Furnace doors constructed in this manner would also aid in the combustion of
fuel and consumption. of smoke.
In order that my invention may be more fully understood I herein give reference
to the accompanying Sheet of Drawings illustrative thereof.
Fig. 1 is sectional side elevation of my improved draw plate, and Fig. 2 is view
of the back of such plate or that part which is placed nearest to the fire.
A is the draw plate at the back of which is cast another plate B so placed as to
leave a space C between the plates such plate B being shorter than the plate A as
shewn. This plate B is inclined and not parallel to the plate A so as to contract
the space C at the part g, and it is also provided with slots or openings b for
purposes hereinafter described.
.
The plate A is suspended on the top bar of the range by the hook or
projection D cast thereon, and is preferably placed near to the oven.
Cold air enters at the bottom of the space C, and coming in contact with the
short plate B becomes heated and rises up the space C which by being contracted
at the top presents the full force of the hot air passing direct into the space or
smoke box E, therefore distributing the hot air partly through the slots b and
partly through the contracted part a.
The hot air in passing through the slots b attracts or draws the flame of the
fire in the direction shewn by the arrows e and carries such flame into the smoke
box where it ignites and consumes the smoke which has been drawn therein by
the air passing through the contracted part a. In this manner much more heat is
obtained from the fire and a saving of coal is effected by the consumption of
the smoke arising therefrom.
A hole F is formed at the top of the plate A by the use of which such plate can
be removed from or placed onto the range.

page_text: In Figs 3, 4, and 5 I have shewn the application of my improvements to the
doors of steam boiler furnaces. Fig. 3 is front view of the door, Fig. 4 section of
same, and Fig. 5 view of the back of the said door.
G is the boiler, H the door having a plate I cast behind it so as to leave a space J
between. Cold air is admitted to this space through perforations in the sliding
plate K, such perforations corresponding with a like number of openings in the
furnace door plate so that these openings can be opened and closed when required.
When cold air is admitted through these openings it strikes against the hot
plate I and becomes heated thereby before it reaches the fire.
Slots g are made in the back plate I so that hot air enters into the space J, the
effect of which is to draw the flame in an upward direction causing it to come
into contact with the smoke which is ignited thereby consequently consuming
smoke and obtaining increased heating power.
The outside plate or furnace door H is kept cool by the cold air which is
admitted to the space J.
An ordinary sight hole is shewn at L.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, I declare that what
I claim is
Firstly. The use and employment of a draw-plate having a plate cast behind it
in such manner so as to leave a space between the two plates for purposes sub-
stantially as shewn and described.
Secondly. The construction of furnace doors having double plates and spaces,
in manner substantially as described and shewn in Figures 3. 4, and 5.