Improvements in Heat Deflectors.
Year: 1893

page_text: Date of Application, 21st Feb., 1893-Accepted. 8th Apr., 1893
COMPLETE TUIFICATION.
[Communicated from abroad by ALBERT WILLIAM ATWATER and JOHN FRANCIS
MACKIE, of the City of Montreal, Province of Quebec, Dominion of Canada,
Advocates.]
Improvements in Heat Deflectors.
1, OLIVER IMRAY, of 28, Southampton Buildings, in the County of Middlesex
Chartered Patent Agent, 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 :-
The invention relates to heat deflectors arranged in the smoke pipe of a stove,
furnace, boiler or other passage for products of combustion, to prevent undue escape
of heat or downdraughts of cold air, as I shall describe referring to the accom-
panying drawings.
Fig. 1 is a part section of a stove pipe with elevation of a deflector according to
this invention.
Fig. 2 is a plan, Fig. 3 is a central vertical section, Figs. 4 and 5 shew
modifications.
Referring to Figs. 1 2 and 3 a is a central stem connecting two inverted conical
deflectors b and g, the lower deflector 6 being preferably cast in one with the stem.
The upper end of the stem is screw-threaded to receive the smaller end of the
deflector g. d is a deflecting ring in form of a truncated cone fitted loosely in
the flue. It is preferably of greater diameter internally than the deflector b.
e is a spindle, square or polygonal in cross section, passed through corresponding
holes of the ring d and having round ends to be turned in holes in the flue
wall by a handle c¹ when greater draught is desired the ring d being then
turned more or less edgewise. At the middle of the spindle c is a hole to receive
the reduced end of the stem a on which the deflector g is screwed.
The heat deflector allows passage of the products of combustion as indicated
in Fig. 1, the heat and hot gases coming in contact first with the lower deflector b,
by which the greater portion of the heat is deflected outwardly and downwardly,
while the gases ascend along the inclined surface of the deflector and then directly
upwards until again diverted by the upper deflector g. Such heat as passes the
lower deflector & is deflected by the inner surface of the ring d upon the base of the
lower deflector 6 and thence upward against the inclined surface of the upper
deflector 9, from which it is returned outwardly and downwardly through the space
between the ring d and the lower deflector b.
When the deflectors become heated they effectually oppose entrance of cold air
from above, and also retain heat in the chamber and prevent its escape along with
the smoke and gases.
By partially turning the spindle c the heat deflector is turned into an angular
position so as to regulate the passage of the products of combustion and modify
the action of the heat deflecting surfaces.
By the construction described, a simple and effective heat deflector and fuel-saver
is produced, which prevents escape of heat through the flue without retarding the
upward movement of the smoke and gases, and promotes more perfect combustion
of fuel when the required heat is attained, less of the heat being allowed to escape
wastefully.
The deflecting surfaces may be inclined at various angles or may be more or less
rounded, without departing from the principles of the invention.
By elongating the stem a, the upper deflector g can be adjusted nearer to or
farther from the ring d.
As shewn in Fig. 4 the deflectors m n instead of being circular are in wedge form

page_text: with an intermediate bevilled deflector p all connected together preferably by strips
such as r r at such distances apart as to leave spaces for free passage of products
of combustion.
Figure 5 shows a modification in which the upper deflector is dispensed, with
this construction being especially applicable to flues of small sectional area.
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 :-
1. A heat deflector consisting of two cones arranged in a flue with an intermediate
conical ring so as to present inclined surfaces deflecting heat backwards while free
passage is left for hot gases forwards in the flue, substantially as described with
reference to Figs. 1, 2 and 3.
2. The modified form of heat deflector in which the inclined deflecting surfaces
are planes substantially as described with reference to Fig. 4.
3. The modified heat deflector made without the upper cone, substantially as
described with reference to Fig. 5.
4. In combination with heat deflectors, such as are referred to in the preceding
claims, cross spindles by which they can be turned into an angular position.
Dated this 21st day of February 1893.
ABEL & IMRAY,
Agents for the Applicant.