Improvements in Fire Doors for Boiler and other Fire Places.
Year: 1886

page_text: Date of Application, 16th Nov., 1886.
Complete Left, 1st Apr., 1887.
Complete Accepted, 3rd May, 1887.
DESED
Improvements in Fire Doors for Boiler and other Fire Places.
I PETER JENSEN of 77 Chancery Lane in the county of Middlesex Fellow of
the Institute of Patent Agents do hereby declare the nature of this invention to
be as follows :—
According to this invention the fire door is made in the form of an open frame
in which is provided a series of thin wide bars placed at an angle and so closely
together as to leave very narrow slits for the entry of the air in thin streams. The
air thus entering will by passing between the hot bars become somewhat heated
while the said bars will be prevented from becoming overheated by the radiation
from the fire. The thin films of heated air thus entering above the fire tend
to further the combustion and to lessen or prevent the generation of smoke. The
bars may be straight, curved or otherwise in cross section and be connected
so as to be movable for the purpose of adjusting the distance between them.
Dated this 16th day of November 1886.

page_text: COMPLETE SPECIFICATION.
Improvements in Fire Doors for Boiler and other Fire Places.
I, PETER JENSEN of 77 Chancery Lane in the County of Middlesex, Fellow
of the Institute of Patent Agents do hereby declare the nature of this invention
(a communication to me from abroad by Hermann Emanuel Noke of Leutewitz, near
Dresden, Saxony, Germany, Engineer) and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement :-
According to this invention the fire door is mado in the form of an open frame
in which is provided a series of thin wide bars placed at an angle and so closely
together as to leave very narrow slits for the entry of the air in thin streams. The
air thus entering will by passing between the hot bars become somewhat heated
while the said bars will be prevented from becoming overheated by the radiation
from the fire. The thin films of heated air thus entering above the fire tend
to further the combustion and to lessen or prevent the generation of smoke. The
bars may be straight curved or otherwise in cross section and be connected so
as to bo movable for the purpose of adjusting the distance between them.
Referring to the accompanying drawings Figure 1 is a front view of part of
a fire door constructed according to this invention. Figure 2 being cross sectional
elevation of same. Figure 3 is a like view but with straight bars instead of curved
ones as in the proceding. Figure 4 is also a cross sectional elevation of a fire
door but constructed without the adjustable plate. Figure 5 is a horizontal section
and Figure 6 a front view of a fire door constructed according to another modification.
Figure 7 differs only slightly from Figure 5, and Figures 8, 9 and 10 represent
respectively horizontal section, front view partly in section and cross sectional
elevation of another modification.
With reference to Figures 1, 2 and 8 it will be seen that the fire door is made
in the form of an open frame in which is provided a series of thin wide bars 6 placed
at an angle and so closely together as to leave very narrow slits for the entry
of the air in thin streams. These bars are shown curved in cross section in
Figure 2 and straight in Figure 3. The air thus entering will by passing between
the hot bars become somewhat heated while the said bars will bo prevented from
becoming overheated by the radiation from the fire. In order to regulate the
amount of air passing through into the furnace as shown by the arrows the door
is provided with a perforated fixed plate c and a perforated sliding plate d with
screwed knobs or equivalents d¹ and d for taking hold of and securing the plate d
at any height on the slotted bar a, so that the supply of air may be regulated
to a nicety by moving the holes in the sliding plate more or less opposite those
in the fixed plate.
Figure 4 shows the same door as before described with the exception of the
sliding perforated plate d, which is here dispensed with.

page_text: In order to still further heat the films of air, the passage thereof to the interior of
the furnace or fire box may be made still more devious by placing another set
of thin bars in the fire door frame A right angles to those above described or
two perforated corrugated plates 61 and 6 may be used as shown with reference
to Figures 5, 6 and 7. These plates have holes drilled in them as shown on the
drawings, so that no two holes in the plates come opposite to each other thus
causing the in-coming air to take a circuitous route. Or instead of using corrugated
plates, tubes may be used as shown in Figures 8, 9 and 10 which are so placed that
they have a somewhat similar effect to that before described on the in-coming air,
that is to say so as to deflect the air currents. The bars 6 and plates and tubes b³, ³
see Figures 5 to 10 inclusive may be connected so as to be movable for the purpose
of adjusting the distance between them or they may be fixed by means of bolts
rivetted into the frame A or the ends of the tubes or plates may be so arranged
as to slide into recesses in the said frame A and be secured there.
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
as the invention communicated to me is :-
First: A fire door for admitting heated air above the grate consisting of a frame
with a system of curved or straight plates & in combination with means for subdividing,
deflecting, or regulating the air admission substantially as described.
Second: A fire door consisting of a frame in which curved or straight plates &
are arranged in combination with means for regulating the amount of air to be
admitted consisting of one fixed and one sliding perforated plate the holes of which
may be brought more or less opposite to each other substantially as and for the
purpose described and shown in Figures 1, 2 and 3.
Third: A fire door consisting of a frame in which curved or straight plates b
are arranged in combination with a perforated plate for subdividing the air
to be admitted substantially as described and shown in Figure 4.
Fourth A fire door consisting of a frame in which plates bare arranged in
combination with perforated corrugated plates 6 and for subdividing and deflecting
the air admission substantially as described and shown in Figures 5, 6 and 7.
Fifth A fire door consisting of a frame in which plates are arranged in
combination with rows of tubes 6 and substantially as and for the purpose described
with reference to Figures 8, 9 and 10.