Improvements in and Connected with Furnace Doors.
Year: 1889

page_text: Date of Application, 17th June, 1889-Accepted, 20th July, 1889
AARDILL
NOWA WYRZAULIN
AANDIER
FIRE THO
Improvements in and Connected with Furnace Doors.
I JAMES GEORGE WILLETT, of 153 Jamaica Road Southwark Park in the county
of Surrey, Manufacturer of Cooking and Heating Apparatus, 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 the construction of door applicable to any kind of enclosed
furnaces, such for example as of boilers, and cooking and heating apparatus, and has
for its object to provide a strong and efficient door by which air is heated and
introduced to the furnace in a novel manner.
According to my invention the door is hollow and divided into two compartments
by an internal diaphragm. The front compartment is open at its base, and the
diaphram has an aperture at or near its top; the inner compartment is closed at its
base, but has certain specially formed diagonal airways on the "louvre" principle, so
that the incoming air will travel up the outside and down the inside through the
louvres and will thus be heated regeneratively and projected equally and regularly
downwards into the furnace; and to facilitate combustion I make the dead plate
sloping towards the grate as hereinafter set forth; also by this construction of door
I am enabled to provide a strong box hinge on the furnace front.
1 will now describe my invention in reference to the accompanying drawings in
which Figure 1 is an elevation of the front of a cooking apparatus having a door
constructed according to my invention applied thereto, and Figure 2 is a section
on line ab thereof showing part of furnace. Similar letters are used to indicate
similar parts in both figures.
A is the furnace front and F is the furnace door of cast iron or steel. f is the
front side which is solid and provided with any usual fastening device; f is an internal
diaphragm approximately central having a cross slot or aperture c (of the same area
as the air inlet at base of compartment) about its top, and is the inner (or fireside)
of the door. The door may conveniently be made in two parts bolted together; the
compartment between fand f³ is open at the bottom s. The compartment between f¹
and is closed at its base but provided with two, three or more louvred apertures
which are stepped or graded as illustrated, through these the air current passes as
indicated by the arrows, and is projected in a downward direction on to the fire, and
the dead plate p is sloped to facilitate combustion.
The dead plate is cast with an angled piece pl and bolted to the front plate so
that the bolts are out of the fire, and its inner end supports the fire bars b.
In the illustations T is the ashpit door, and S S are the usual smoke flue doors:
V V are bolts which in an apparatus such as is illustrated pass right through to
the back to that when any repairs are required the nuts can be readily removed and
the whole front plate with its fittings taken bodily off.
By this construction the fire door is necessarily thick from front to back, therefore
I am enabled to cast on the hinge eyes e e and on the front plate a strong eye e¹ to
receive the bolt.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
A hollow furnace door divided into two compartments by an internal diaphragm
L
is the ton commastment being anan and

page_text: the base of the inner compartment closed but provided with louvred airways the
whole being constructed and arranged substantially as and for the purposes set
forth.
leted thin 17th
11000
J. C. CHAPMAN, Fel. Inst. Patent Agents,
70, Chancery Lane, London, W.C., Agent for Applicant.