Year: 1886

page_text: I, JOHN WILLIAM DYSON of Acorn Road in the City and County of Newcastle
on Tyne, Architect, do hereby declare the nature of this, invention to be as
follows:-
:
The object of this invention is to obtain a more effectual extraction of Smoke
from Chimney flues, or of foul air from Ventilating flues, and for preventing down
draught.
In a cylinder or tube forming the Cowl or top, are four vertical openings with
outwardly curved lips. Over these openings guard or deflecting plates are arranged,
leaving spaces between the lips and the guard plates. The outer air passes through
the said spaces, and these spaces being contracted by the lips, cause the air to pass
the openings at an accelerated speed, and effect a considerable suction of Smoke or
foul air from the tube or flue.
The outer air in passing through the said spaces is deflected by the lips towards
the inner surface of the guard plates and is therefore prevented from passing down
the tube or flue.
Around the exterior of the top of the cylinder or tube are arranged three
conical rings, the top of the lower ring is placed slightly above the bottom of the
upper ring, and each upper ring is of greater diameter than the one below.
The uppermost ring is deeper than the two below, and round its lower edge is
fixed a narrow band, dependent therefrom.
The top of the lower ring is fixed to the top of the cylinder or tube, and from
the bottom edge of this ring the guard plates depend.
Round the exterior of the top of the uppermost conical ring, a small domical or
convex ring is arranged.
These rings are supported by stays.
The wind blowing against the conical rings is deflected in an upward direction
and further assists in extracting the Smoke or foul air from the flue.
To the top of the Cowl is fixed a conical cap, or domical cover, or a suspended
plate (which said plate is made to slide up through the opening in the domical or
convex ring), to deflect the wind impinging thereon and preventing any down
draught.
:
Dated this twenty first day of 'Ancil 1886

page_text: Flues.
I JOHN WILLIAM DYSON of Acorn Road in the City and County of Newcastle
on Tyne, Architect; do hereby declare the nature of my invention for "IMPROVE-
MENTS IN COWLS OR TOPS TO CHIMNEY OR VENTILATING FLUES" and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement:-
'ך' '
The object of my invention is to obtain the more effectual extraction of smoke
or foul air from chimney or ventilating flues, and for preventing down draught;
and it consists essentially of a tube forming the termination of the flue, in which
are vertical openings, covered by guard or deflecting, plates; over and around the
tube is a series of rings, with or without a cap or cover on the top, the whole
being arranged and operating substantially as hereinafter more particularly
explained:
.
For illustrating this invention. I have chosen its application to a chimney flue,
but of course it will be understood, that this cowl will be of great value for affixing
on the top of ventilating flues.
In the accompanying drawings like letters of reférence indicate corresponding
parts in each figure.
Figure 1. represents a sectional plan of the cowl, through the lines 1-2 in each
figure.
1
A is a tube communicating with the flue, in which are four vertical openings D.
These said openings have outwardly curved lips B.
Opposite the openings D, guard or deflecting plates C are arranged, leaving
The outer air passes
spaces D 1. between the lips B and the deflecting plates C.
between the spaces formed by the outer side of the curved lips B, and the inner
side of the guard or deflecting plates C, which said spaces owing to the shape of
the lips B, are widest at the part at which the outer air enters; so that a large.
volume of air enters, and the said spaces being contracted as at D. 1, the air passes
"the openings D at an accelerated speed, and effects a considerable suction of smoke
from the tube through the openings D. The air in passing through the spaces is
deflected outwardly by the lips B to the inner side of the guard plates C, and is
thus prevented from entering the tube A.
Figure 2 is a vertical section through the centre of the Cowl, and shows the
arrangement of conical rings above the tube.
Three conical rings E, F, and G, are arranged above the tube. The lower, ring E
is fixed to the top of the tube, and to, the lower edge of the said ring E, the: guard
or deflecting plates C are fixed, and depend therefrom, the bottom of the said guard
plates are supported from the tube by, stays K.
The second conical, ring F is of slightly greater diameter than the ring E. The
third conical ring is of larger diameter and deeper than the rings E and F. To
the lower edge of the ring G is fixed a narrow band G. 1, and depending there-
from. The superior diameter of the conical ring G is slightly less than the diameter
of the tube A.

page_text: Around the top of the conical ring ✪, a small domical, or convex ring H is
arranged, the inferior diameter of which is greater than the superior diameter of
the ring G, and the superior diameter of the said ring His about equal to the
superior diameter of the ring G.
The lower edge of each ring is arranged slightly below the upper edge of the
ring below.
"The said conical and domical rings are attached together by stays or strips as K,
and annular openings are thus formed between the rings.
The wind blowing against the rings
deflected in an upward direction as
shown by the arrows, and thus further assists in extracting the smoke from the
tube A.
For the purpose of preventing downdraught, a conical cap J is fixed over the
domical ring H, leaving a space as at I for the passage of air or smoke between
the domical ring H and the cap J. The wind impinging on the cap J is diverted;
and thereby prevented from passing into the tube and causing downdraught.
Figure 3 is, a sectional plan of the tube A through the lines 3-4.
Figüré 4 represents an elevation of the Cowl.
Figure 5 is a plan looking on the top of the cap J.
Figure 6 represents the upper part of the Cowl in elevation, and shows a
modification of the cap or cover, which is arranged of domical formation as in J. 1.
Figure 7 shows a modification of the lower portion of the Cowl, and is made to
expand from the tube to an oblong formation as at A. 1, and has a dependent
rim A. 2. to go into the flue, for the purpose of steadying the cowl when fixed on
a chimney.
Figure 8 is a sectional plan of the modification shown in figure 7.
Figure 9 represents a vertical section of the upper part of the cowl, and shows a
modification, in which the cap or cover is dispensed with. A suspended domical
or conical deflecting plate J. 2, is arranged hung by a rod M, which said rod works
through guides L at N. The guides L are fixed to the rings G and H, and cross
each other at N, at a distance above the ring H.
Figure 10 represents a plan of figure 9 looking on the top of the guides L, and
shows the crossing of the said guides.
In this arrangement the wind passing through the openings in the domical
ring H in a downward direction, impinges on the deflecting plate J. 2, and is
diverted in the direction of the arrows, passing out at the annular opening O, round
the conical ring F.
When this arrangement is applied to a Smoke flue, and for the purpose of
effectually sweeping or cleaning the upper part of the Cowl, the brush pressing
under the deflecting plate J. 2, causes it to slide up in the guides, and allows the
brush to pass out of the top of the Cowl, thus enabling the whole to be swept.
I do not confine myself to the employment always of the caps J, or J 1, or the
deflecting plate J 2, as in cases when only a more effectual extraction of smoke
from chimney flues is required, and where a downblow is experienced, it is not
absolutely necessary that the cap or deflecting plate should be employed.
The Cowl is herein described as being round, but it may also be made square or
other suitable form, and be made of galvanized iron, zinc, earthenware (except in
the arrangement with deflecting plate J 2,) or other applicable material.
Figure 11 shows the application of the Cowl as a ventilator, adapted as at A 3,
to connect with a soil pipe, and to this the cap J or J1, may be applied.
Figure 12 is a sectional plan of figure 11 at the lines 5-6.
>
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:
1. In the tube of a cowl having vertical openings covered by guard plates as
at D and C, the employment of outwardly curved lips (as at B) to such openings

page_text: in manner and for the purpose substantially as hereinbefore specified and shown
on the accompanying drawings.
2. In a cowl-with vertical openings in the tube covered by guard plates, and
such openings having outwardly curved lips, the employment in combination there-
with, of the conical rings E. F'and G, the dependent band G. 1, and the domical
ring H, either with or without the cap J or J. 1, fixed above and around the said
tube, in manner and for the purpose substantially as herein before described and
shown on the accompanying drawings. I do not claim as new the shape of the
rings E. F. G, the dependent band G1, the ring H or the caps J or J. 1.
3. The employment of the suspended domical or conical deflecting plate J-2,
arranged to slide up in the guides L, through the rings G and H, in manner and
for the purpose substantially as hereinbefore described and shown on the accom-
panying drawing.