IMPROVED MEANS AND APPARATUS FOR PREVENTING DOWN AND INCREASING UPWARD DRAUGHT IN CHIMNEYS, THEREBY PREVENTING THE SMOKING THEREOF
Year: 1877

page_text: LETTERS PATENT to Lewis Cogan, of the Firm of Cogan and Son, of Torquay,
in the County of Devon, for the Invention of "IMPROVED MEANS AND
APPARATUS FOR PREVENTING DOWN AND INCREASING UPWARD DRAUGHT
IN CHIMNEYS, THEREBY PREVENTING THE SMOKING THEREOF."
Sealed the 3rd August 1877, and dated the 20th April 1877.
PROVISIONAL SPECIFICATION left by the said Lewis Cogan at the Office of
the Commissioners of Patents on the 20th April 1877.
LEWIS COGAN, of the Firm of Cogan and Son, of Torquay, in the County of
Devon. "IMPROVED MEANS AND APPARATUS FOR PREVENTING DOWN AND
INCREASING UPWARD DRAUGHT IN CHIMNEYS, THEREBY PREVENTING THE SMOKING
THEREOF."
The object of my Invention is to prevent the down and to increase the upward
draught in chimneys, and for this purpose I place at or near the upper part
of a chimney or stack of chimneys a tube or pipe separate and distinct from the
chimney proper. The upper portion of this pipe is preferably trumpet-shaped, and
pivotted like an ordinary cowl, so as to revolve or turn on an axis, and is provided
with vanes or other appliances to keep the same in the required position in the
wind, so that the open aperture of the cowl receives the wind (which is the reverse
way to cowls as generally arranged now) in the aperture, that is, in the trumpet-
shaped portion of the cowl. I place a fan, which is caused to revolve by the wind
striking the blades thereof, the speed being regulated according to the force of the
wind. The pipe aforesaid is carried down to the distance desired, in some cases
only a few feet, say, the height of the chimney or stack of chimneys, and is then.led
along by an elbow or other joint in a horizontal or partially horizontal direction,
having preferably a slight upward tendency to the chimney or stack, into the flue
or flues of which it enters.
Sometimes I carry the pipe down to the lower part of the chimney flue or flues
or to such a level as may be required.

page_text: The action is as follows:-The fan revolving in the cowl causes a down current
of air (which is increased or diminished according to the state of the wind) in the
pipe, which current of air being driven through the elbow piece of the tube is carried
into the flue or flues of the chimney or stack of chimneys, in which an upward
draught is thereby created. Whore the tube is conveyed further down the chimney,
or to the lower part, the upward draught is produced from that point where the tube
enters the flue.
The action of the upward draught created in the chimney by the downward
draught produced as before described has the further advantage of materially
reducing the quantity of soot collecting in the chimney.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by the
said Lewis Cogan in the Great Seal Patent Office on the 20th October 1877.
LEWIS COGAN, of the Firm of Cogan and Son, of Torquay, in the County of
Devon. "IMPROVED MEANS AND APPARATUS FOR PREVENTING DOWN AND
INCREASING THE UPWARD DRAUGHT IN CHIMNEYS, AND THEREBY PREVENTING THE
SMOKING THEREOF."
The object of my Invention is to prevent the down and to increase the upward
draught in chimneye, and for this purpose I place at or near the upper part of a
chimney or stack of chimneys a tube or pipe separate and distinct from the chimney
proper. The upper portion of this pipe is preferably trumpet-shaped, and pivotted
like an ordinary cowl, so as to revolve or turn on an axis, and is provided with
vanes or other appliances to keep the same in the required position in the wind, so
that the open aperture of the cowl receives the wind (which is the reverse way to
cowls as generally arranged now) in the aperture, that is, in the trumpet-shaped
portion of the cowl, I placo a fan, which is caused to revolve by the wind striking
the blades thereof, the speed being regulated according to the force of the wind.
The pipe aforesaid is carried down to the distance desired, in some cases only a few
feet, say, the height of the chimney or stack of chimneys, and is then led along by
an elbow or other joint in a horizontal or partially horizontal direction, having
preferably a slight upward tendency to the chimney or stack, into the flue or flues
of which it enters.
Sometimes I carry the pipe down to the lower part of the chimney flue or flues,
or to such a level as may be required.
And in order that this Invention may be more fully understood, I will now proceed
to describe the same with reference to the accompanying Drawings.
Figure 1 is a vertical section through a draught tube, as applied near the top of
a chimney.
Figure 2, a front elevation of part of the draught tube.
Figure 3, a part plan.
Figure 4, a part plan to an enlarged scale.
Figure 5, an end clevation of a fan applied in the draught tube; and Figure 6, a
cross section through the bearing for the fan spindle.
Figure 1a is a part section through chimney and draught tube.
The draught tube consists of an upper part or cowl A, which is free to revolve
independently of the lower or fixed part B. For this purpose the cowl A is provided
with a central spindle a, which fits freely in the bush b that forms part of the pipe B.
The bottom part of a rests on a step b'; A¹ is a shield or weather cone covering the
open enlarged part B¹, as is usual in other cowls; C, C, are two vanes placed in a
divergent position on the cowl A for keeping it in the wind, but so that the upper
cowl aperture opposite them receives the wind, which is the reverse way of ordinary

page_text: cowls; c, c, are stays for the vanes C, C; D is a fan with blades or vanes of any.
convenient shape or construction, but here shown flat; the wind entering the
trumpet shaped aperture of the cowl causes the fan to revolve at a speed in
proportion to the force of the wind, and producing or inducing a descending current
or down draught, which passes down into the pipe B, thence into the elbow pipe E,
and finally having its oxit in the chimney F, to which the apparatus is applied.
I prefer to arrange the elbow E and its prolongation with the exit aperture E¹, as
here shown, that is, firstly, so that the rain water may drain off at the lowest point
just below the cowl, and be led off to some rain water pipe or gutter; secondly, so
that the opening E' is contracted relatively to the area of B and A; and, thirdly, so
that the clear area of the chimney F is not not diminished or interfered with.
Figure 1 shows a slightly different form of the pipe E, such as may be suitable
under some circumstances. The distance between a chimney or flue F and the
cowl or apparatus may be very short, or it may be very long, according to
circumstances.
In order to keep the cowl A steady, a small brake lever is arranged in the lower
part of the cowl A, and held up against the bush 6 of the stationary pipe B by
means of a spring e. The bush or sleeve b is by preference charged with oil, and is
for this purpose cup shaped above.
The oiling arrangements which I prefer to use for the fan will be more clearly
understood by reference to Figures 4 and 6. The spindle ƒ of the fan rests on two
friction rollers g, which revolve in oil in the oil box h. By this arrangement
the fan is made to run very easily. j,j, are covers for keeping dust out of the
bearings; k, l, are sliding covers serving to close apertures for gaining access to the
fan bearings.
Figure 7 is a vertical section, and Figure 8 a plan section of a modified arrangement
of a down draught tube fitted with fan appliance, and to be connected to a chimney
in the same manner as the afore-described draught tubes. In this case, instead of
fitting a revolving tube with one fan, which is made to revolve whatever tho
direction of the wind may be, I reverse the arrangement in this manner that the
tube is stationary, but I place a fan at each of the four cardinal points of the wind,
or by preference I also place a fan between each two cardinal points, the result and
operation or action being exactly the same as in the case of the former or one fan
arrangement, for in this present arrangement also, whatever the direction of the
wind, one fan only will be practically affected thereby, and the down draught con-
sequently be created in all cases, this down draught or current being also in this
case conveyed to the chimney stack or stacks by an elbow and pipe, as before.
D, D, are the fans placed at each of the four points of the wind, or four points of
the prevailing winds of the locality.
The mode of arranging their spindles and the oiling of same may be similar
to the arrangements already described.
The action is as follows:-The fan or fans revolving in the cowl causes a down
current of air (which is increased or diminished according to the state of the wind)
in the pipe, which current of air being driven through the elbow piece of the tubo
is carried into the flue or flues of the chimney or stack of chimneys, in which an
upward draught is thereby created. Where the tube is conveyed further down the
chimney, or to the lower part, the upward draught is produced from that point
where the tube enters the flue.
The action of the upward draught created in the chimney by the downward
draught produced as before described has the further advantage of materially
reducing the quantity of soot collecting in the chimney.
And having thus described and ascertained the nature of this Invention I declare
that I claim,
Firstly. The application of the down draught in a tube fitted with fan or fans to
receive the wind for causing or facilitating an up draught in a chimney or flue cou
nected therewith, substantially as set forth.

page_text: Secondly. The construction of movable cowl and parts belonging thereto, substan-
tially as herein set forth, when applied to the purpose of causing or facilitating an
up draught in a chimney or flue.
In witness whereof, I, the said Lewis Cogan, have hereunto set my hand and
seal, this 16 Sixteenth day of October, in the year of our Lord One
thousand eight hundred and seventy-seven.
LEWIS COGAN (LS.)