An Improved Chimney Pot, Cowl, or Ventilator.
Year: 1892

page_text: COMPLETE SPECIFICATION.
An Improved Chimney Pot, Cowl, or Ventilator.
We, WILLIAM THOMAS SMITH, and ROBERT SMITH, trading as Smith
Brothers, Drapers, of 80, 106, and 107, St. Mary Street, Southampton, in the
County of Hampshire 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 :-
Our invention relates to an improved manner of constructing chimney pots,
chimney tops, or cowls, the same being also adaptable for use as a ventilator when
mounted upon a ventilating shaft, or aperture formed in the roof or other part of a
building intended for the exit of heated, vitiated, or impure air; the object of
which is simplicity of construction, no moving parts to get out of order, is as
easily fixed where required as an ordinary chimney pot, and is a perfect cure for
smokey chimneys, and as a ventilator entirely overcomes the difficulty hitherto
experienced of providing efficient ventilation without downdraught.
We may construct our said invention of sheet iron, tin, zinc or other, or any
combination of metals, or of stone, earthen, or other pottery ware and either
circular rectangular or polygonal in cross section, and of any desired contour
externally consistent with the principles hereafter set forth, and of any desired
length, and with or without a flange at the top and bottom ends thereof.
The essential features of our invention is the employment of two vertical tubes
or channels placed more or less parallel with each other, but not absolutely side by
side, and not necessarily both of the same dimensions or contour externally, or in
cross section. The top end of the one of said tubes or passages intended to be the
lower tube when finished, is bent or curved, or diverges from the vertical, in any
desired manner, and joins the upper tube or channel at, or about its centre, and
at this point, suitable baffle plates are provided, in such a manner relatively to
cach other that, a down draught entering the top of the upper tube or channel, is
prevented thereby from passing down the lower tube or channel, as both ends of
the upper tube or channel being open the down draught passes harmlessly there-
through. At the same time the said baffle plates do not obstruct the passage of
the smoke, or vitiated air, but provide a curved passage therefor from the lower
to the upper tube or channel, and this may there be met by the downdraught in
the upper tube, in which case it would be carried thereby through and out at the
lower end of the upper tube, consequently a down draught in the upper tube
however severe would tend to improve rather than deteriorate the updraught in
the lower tube or passage. The said baffle plates when our invention is made of
metal would be rivetted or otherwise fixed in position during the progress of
manufacture, but when the same is made of any kind of pottery ware a suitable
provision would be made in the mould that, the said baffle plates may be formed
integrally therewith. Or we may employ metallic baffle plates rivetted or
otherwise connected to the pottery ware tubes or channels as may be desired.
The accompanying drawings are intended to render our invention more clear in
which we have shown several ways among many in which we may construct the
said pot cowl or ventilator, but we do not confine ourselves to those shown only,
but may employ any combination or modification thereof, or may duplicate or
triplicate them, or more, if necessary, so that, one lower tube or passage may
possess several divergences and be connected to a like number of upper tubes or
passages, or several lower tubes or passages coming from as many chimneys or air
shafts, or outlets, may all converge into one central upper tube, and the baffle
plates arranged suitably therefor, to attain the same ends, and this without
departing from the principle of our invention.

page_text: Fig. 1 is an external view of our invention fixed in position as a chimney pot or cowl.
Fig. 2 is a similar view of same when employed as a ventilator for the roofs of
buildings.
Figs. 3, 4, 5, and 6 are sectional views showing modifications of construction
and of different internal and external contour without the slightest departure from
the principle involved.
Fig. 7 is an external view of the upper tube provided with a double outlet at the
bottom thereof.
In carrying our invention into effect when intended to be employed as a chimney
pot or cowl, we construct of any suitable material, the bottom tube, channel, or
passage A, preferably with a rectangular flange a, which, in the case of metallic
pots, it may be convenient to provide at the extreme bottom end, in order that the
same may be embedded in the cement of the chimney as at Figs. 3, 5 and 6, or
higher up in the case of pottery ware as at Fig. 4, so that the lower end of A. may
sink within the brickwork to that extent, or either may be employed in both cases
as desired, but when our invention is employed as a ventilator the said flange or
flanges, if used, may partake of any form to suit the air outlet to which it is
intended to be attached, which, if upon the apex of a roof may be similar to that
shown at Fig. 2, or any suitable modification thereof. The upper tube passage or
channel B, may be connected to, or formed integrally with A, so as to stand some
distance therefrom, although parallel therewith, as at Fig. 3, this being arranged
by the extent of the curve, bend or angle, at the upper end of A, or close thereto
as at Fig. 4; Or the upper end of B may be clear to A while the lower end is
some distance therefrom, as at Fig. 5, this being arranged by the formation of B.
Or B may stand from A and have its upper end formed bell shaped, and its lower
end curved away from A. as at Fig. 6, or both ends may be bell shaped if needed.
Or any combination of these devices may be employed as desired according to the
position the pot, cowl, or ventilator is to occupy, and according to the surrounding
circumstances, as for instance; It may sometimes occur that the compulsory
position of the pot, cowl, or ventilator may be such that, the lower end of B may
be over or nearly over some adjacent roof, or other chimney, or ventilator, in which
case the downdraught through B might impinge thereon, and either, defeat the
object of our invention, or be a nuisance to other people, hence the provision for
the curvature of the lower end of B, and as a further provision against such
contingencies, we may construct the lower end of B, with a duplex outlet, so that,
if placed over the apex of a roof, the downdraught through B may not be impeded
by impinging thereon, as shown at Fig. 7.
The baffle plates c, d being as before mentioned to prevent the downdraught
through B from passing down A, while permitting the free exit of the smoke, may
be arranged in various ways according to the construction of the pot, cowl, or
ventilator, and may be either perfectly vertical as at Fig. 3, or bent, curved or
angled so as to partake of the position shown at Fig. 4 or any modification thereof,
or the junction of A, B, may be arranged to form c, d, as shown at Figs. 5 and 6.
A suitable flange or stay C, may be used if necessary to strengthen the juncture
of A and B, or the divided lower end of B Fig. 7, when used. The curved arrows
in the figures show the path of the smoke or updraught, while the straight arrow
in Fig. 3 shows the path of the downdraught through B, which would be identical in
all the devices employed.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that
what we claim is :-
First. The improved chimney pot, cowl, or ventilator, made of any suitable
material, and of any shape or design internally or externally, capable of maintaining
the principle involved, and operating substantially as herein described and shown
by the accompanying drawings.

page_text: Second. The construction and use of the improved chimney pot, cowl, or
ventilator, consisting of a more or less vertical tube, passage or channel A, with
one or any number of curved or angled divergencies at its upper end, connected to
a like number of more or less vertical tubes, passages, or channels B open at their
upper ends, with one or more openings at their lower ends, or any number of tubes,
passages, or channels A, converging at their upper ends by curves or angles, into
one central tube, passage, or channel B, open at both ends, provided internally
with baffle plates c, d suitably disposed for the prevention of downdraught
through A, and connected to, or formed integrally by, or with, A and B, the whole
combined and operating substantially as, and for the purposes herein set forth and
shewn by the appended drawings,
Dated this 16th day of March 1899
GEO. THOS. HYDE,
4, Little Moorfields, Fore Street, London, E.C.,
Agent for the Applicants.