Improvements in or relating to Furnaces, Stoves, and the like.
Year: 1897

page_text: Date of Application, 7th Sept., 1897
Complete Specification Left. 20th Dec.. 1897-Accepted. 5th Feb. 1898
PROVISIONAL SPECIFICATION,
Improvements in or relating to Furnaces, Stoves, and the like.
I, JOHN THOMAS MAZEY, of 43, Foleshill Road, Coventry, Warwickshire, En-
gineer, do hereby declare the nature of this invention to be as follows:-
My invention relates to furnaces, stoves and the like and has for its object
to obtain, by the simple attachment of certain apparatus (consisting of the box
and shutter hereinafter described) to the inside of existing furnace and like doors
provided with ordinary draught regulating apparatus,a more complete com-
bustion of smoke than hitherto obtainable by any other means, a larger heating
surface, a greater saving of fuel and an abatement of the smoke nuisance.
attachment has the effect of admitting air on the fire line and in so doing causes
eddies which restrain the rush of flame and smoke over the bridge and effect com-
plete combustion of all gases before leaving the furnace.
The
The apparatus consists of a box of somewhat semi-cylindrical form but pre-
ferably with modified ends, and the top is preferably bowed, so that the mouth of
the box conforms to the usual shape of furnace doors. The box has a central
longitudinal aperture at the back. Within the box is a shutter preferably of
rectangular elevation and curved transverse section, and pivotted at or near its
lower edge to the ends of the box. The box is provided with suitable means of
attachment to the inside of the door.
In action, the air passes through the draught regulating apparatus or apertures
in the door into the front of the box, and over and under the shutter into the
back of the box. Thence it issues into the furnace in eddies, thereby having the
effects and attaining the objects hereinbefore indicated. The draught is regulated
by raising or lowering the shutter which may be retained in any desired position
by any suitable means.
The application of the invention to stoves and the like differs in no essential
particular from that hereinbefore described, but modifications may obviously be
made without exceeding the scope of my invention.
Doted this 6th dow of September 1807
G. DOUGLAS LEECHMAN,
18, Hertford Street, Coventry,
75, Chancery Lane, London, W.C., and
49, Middle Abbey Street, Dublin,
Patent Agent for the Applicant.

page_text: Improvements in or relating to Furnaces, Stoves, and the like.
I, JOHN THOMAS MAZEY, of 43, Foleshill Road, Coventry, Warwickshire, En-
gineer, 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: -
My invention relates to furnaces, stoves and the like and has for its object
to obtain, by the simple attachment of certain apparatus (consisting of the box
and shutter hereinafter described) to the inside of furnace and like doors provided
with suitable draught apparatus or apertures, a more complete combustion of smoke
than hitherto obtainable by any other means, a larger heating surface and greater
saving of fuel and an abatement of the smoke nuisance. The attachment has
the effect of admitting air on the fire line and in so doing causes eddies which
restrain the rush of flame and smoke over the bridge and promote complete com-
bustion of all gases before leaving the furnace.
And in order that my invention will be properly understood and readily carried
into effect I will further describe the same with the aid of the accompanying
drawings, wherein like parts are designated by like reference numerals through-
out.
Figure I is a front elevation of the said apparatus detached.
Figure II is a longitudinal section of part of an ordinary furnace, with the
apparatus applied to the door thereof.
Figure III is a front elevation of such a door provided with a suitable draught
apparatus.
Fig. III is drawn to a smaller scale than Figs. I and II.
The apparatus consists of a box 2 preferably of the form shown in Figs. I and II,
the back parts of the ends 2ª being inclined towards each other, and the top 2b
being bowed so that the mouth of the box conforms to the usual shape of furnace
doors. The box has a central longitudinal aperture 4 at the back; and I find
that an aperture measuring 12" x 1" gives good results for the larger sizes of
furnaces. Within the box is a shutter 3 preferably of rectangular elevation and
curved transverse section. The said shutter is pivotted (8) at or near its lower
edge to the ends of the box and is preferably so constructed and arranged that
the distances from the pivot line to the upper edge of the shutter and to the
lower front edge of the box respectively are equal or approximately equal. The
box is provided with lugs 5 whereby it may be bolted to the door 6, or other
suitable means may be provided for this purpose. The said door is provided with
any suitable draught apparatus or apertures such as the regulator 7 shown in
Figs. II and III. If the door be not constructed with suitable apertures such
may be made therein, or another door provided therewith may be substituted.
It is not essential that the draught apertures in the door be capable of regulation,
as the draught will usually be regulated by raising or lowering the shutter 3
by a rod passed through the apertures 7; and the shutter may be retained in
any desired position by tightening the pivots 8 or by other suitable means.
In action, the air passes through the draught regulating apparatus or apertures 7
in the door 6 into the front of the box, and over and under the shutter 3 into
the back of the box; thence it issues through the aperture 4 into the furnace.
The effect of the form and arrangement of the parts is to cause the air to eddy
or whirl instead of proceeding in a direct stream, and hence the issue of the
smoke and unburnt gases is retarded until the air is thoroughly mixed therewith
and the combustible portions thereof are consumed, the fire area at the same time
being increased, thus attaining the objects hereinbefore indicated. In working

page_text: out my invention I have found that the apparatus is much more effective
and my objects are correspondingly more fully obtained by providing the shutter
with two horizontal slots 10 and a sharp edged back 9. The currents of air
passing through the slots 10 serve to break up the currents passing over and
under the shutter, and the edge 9 further assists in directing the currents through
the slot 4.
The application of the invention to stoves and the like differs in no essential
particular from that hereinbefore described, but modifications may obviously be
made without exceeding the scope of my invention.
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 I
am aware that it has already been proposed to provide the doors of furnaces and
the like with apparatus intended to cause an eddy or whirl for the purposes
herein set forth and I therefore do not claim such apparatus broadly but what I do
claim is:-
1. The improved apparatus for restraining the rush of flame and smoke and
promoting the complete combustion of gases in furnaces, stoves and the like,
by causing eddies in the draught, substantially as herein described and as illus-
trated by the accompanying drawings.
2. In a furnace, stove or the like, the combination with a door having suitable
ventilating apparatus or apertures of, a box such as 2 having a slot such as 4, and
of a shutter such as 3 mounted within the said box, all combined, arranged and
adapted to operate, substantially as and for the purposes set forth.
3. In a furnace, stove or the like, apparatus consisting of a box adapted to
be secured to the interior of the door and having a horizontal slot in the back
thereof, and a shutter pivotted horizontally within the said box, the said apparatus
being adapted to restrain the rush of air and smoke, substantially as herein set
forth.
4. In apparatus for causing eddies in the draught of furnaces, stoves and the
like, an adjustable shutter, substantially as and for the purpose set forth.
5. In apparatus referred to in the preceding claiming clauses, providing the
shutter with horizontal slots such as 10, substantially as and for the purpose
set forth.
6. In apparatus of the kind referred to in the preceding claiming clauses,
providing the shutter with a sharp edged back such as 9, substantially as and
for the purpose set forth.
Dated this 18th day of December 180%.
G. DOUGLAS LEECHMAN,
18, Hertford Street, Coventry,
75, Chancery Lane, London, W.C., and
49, Middle Abbey Street, Dublin,
Patent Agent for the Applicant.