Improvements in Chimney Cowls.
Year: 1891

page_text: Date of Application, 5th Mar., 1891
Complete Specification Left, 30th Apr., 1891-Accepted, 30th May, 1891
PROVISIONAL SPECIFICATION.
Improvements in Chimney Cowls.
I, GEORGE TAYLOR, of No. 204, The Quadrant, Tulse Hill, in the County of
Surrey, General Merchant, do hereby declare the nature of this invention to be as
follows:-
My invention relates to improvements in chimney cowls, and its general objects
are to improve the draught, to prevent down draught; to improve combustion,
more especially of the smoke in the chimney; as well as to facilitate the task of
sweeping the chimney.
In carrying my invention into effect I provide a pipe of metal, or other suitable
material, of an equal diameter throughout, except near about its middle where it is
expanded so as to present in cross section the appearance of two cones joined at
their bases. The surface of the lower cone may be less than that of the upper one,
but while the surface of the upper one is plain that of the lower is largely
perforated. The top of the pipe is provided with a suitable stationary, or other
type of, weather guard, preferably conical in cross section. This is made detach-
able in any convenient way for the purpose of providing for a free passage of the
sweeping brush through the entire length of the pipe.
The general features of a cowl made according to my invention may be modified
more or less for the purpose of adapting it to any particular circumstances provided
that there be still retained a clear way for the brush, the detachable weather guard
and the perforated conical surface.
Dated this 5th day of March 1891.
PHILLIPS & LEIGH,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Chimney Cowls.
I, GEORGE TAYLOR, of No. 204, The Quadrant, Tulse Hill, in the County of
Surrey, General Merchant, 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 improvements in chimney cowls, and its general objects
are to improve the up-draught, to prevent down-draught, to improve combustion,
more especially of the smoke in the chimney; as well as to facilitate the task of
sweeping the chimney.
In carrying my invention into effect, I provide a pipe of metal, or other suitable
material, of an equal diameter throughout, except near about its middle, where it is
expanded so as to present, in cross section, the appearance of two cones joined at
their bases. The surface of the lower cone may be less than that of the upper one,
but while the surface of the upper one is plain, that of the lower is largely
perforated. The top of the pipe is provided with a suitable stationary, or other
type of, weather guard, preferably conical in cross section. This is made detach-
able in any convenient way for the purpose of providing for a free passage of the
sweeping brush through the entire length of the pipe.
The general features of a cowl made according to my invention may be modified
more or less for the purpose of adapting it to any particular circumstances, provided
that there still be retained a clear way for the brush, the detachable weather guard,
and the perforated conical surface.

page_text: referring in so doing to the accompanying drawings which are to be taken as part
of this Specification and read therewith.
Fig. 1 is an elevation.
Fig. 2 is a sectional elevation.
Fig. 3 is a horizontal section on the line A.-B of Figs. 1 or 2.
Fig. 4 is an elevation.
Fig. 5 is a sectional elevation corresponding therewith.
Fig. 6 is a horizontal section on the line C-D of Fig. 5.
Fig. 7 is a vertical sectional elevation taken on the line E-F of Fig. 9.
Fig. 8 is a plan taken on the line G-H of Fig. 7.
Fig. 9 is an elevation.
Referring to Figs. 1, 2 and 3, a, a is a sheet metal pipe; and b, the expansion
consisting of two cones, c and d, joined at their bases. It will be noticed that the 1
area of the lower cone, i.e., d, is much less than that of the upper one c.
perforations in the lower cone, and their joint area is nearly equal to that of the
unperforated surface.
e, e are
is a second expansion constructed on the same principles and plan, and for the
same purpose, as the one already described. f¹, fare the two cones constituting
it; and the set of perforations.
is a detachable stationary weather-guard. It is fixed upon the top of the
expansion by legs g' adapted to enter long sockets 93 standing upon the
cone f¹.
Referring to Fig. 2, the construction is identical with that above described with
reference to Fig. 1, excepting that there is no wind-guard.
Referring to Figs. 4, 5 and 6, the expansion into two cones joined at their bases
is modified in outline so as to present the contour of a sphere h introduced into the
pipe a. e, e are the perforations in the annular space forming the surface of the
hollow sphere next to the pipe.
Referring to Figs. 7, 8 and 9, the perforated bottom cones d and f2 of the con-
structions illustrated in Figs. 1 and 2 are dispensed with, and in their place I make
use of open airways; separated by webs k provided to support the upper cones c
and upon, and hold them to, the pipe a.
The method of fixing the detachable weather-guard on the top of the cowl is the
same as illustrated in Fig. 1 and described therewith.
I wish it to be distinctly understood that my invention as hereinbefore described
with reference to the accompanying figures is equally applicable to purely
ventilating purposes, and its construction is peculiarly adapted to be used for the
purpose of creating upward air-currents.
As to the material in which my invention is made, I do not confine myself to any
one in particular. The types illustrated in Figs. 1, 2, 3, 7, 8 and 9 are made in
sheet metal, while those illustrated in Figs. 4, 5 and 6 are made in earthenware or
analogous material.
The action of my invention is exceedingly simple but at the same time very
efficient. As the column of air in the pipe is warmer than that outside, currents of
air flow upwards through the perforations in the bottom cones, or those in the
underside of the sphere, or through the wind-ways j, and create vacua in those
portions of the pipe a below them. The draught in the latter is therefore much
improved. The vacuum-creating efficiency of the said currents is of course much
improved when the wind is high or gusty.
The entrance of down currents into the cowl at the top is prevented by the fixed
wind-guard, or if they enter a cowl without a guard, then will they leave it through
the perforations or ways above mentioned. Down-draughts are therefore prevented
whether the invention be used on a chimney or purely as a ventilator.
It is obvious that my invention constructed as illustrated and described is equally
applicable for purposes of ventilation.

page_text: The position of the expansion on the pipe a may be varied if desired. The
drawings shew it as below the middle and it may be as low as from 6 to 12 inches
above the base.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is,
1. The combination of pipe and double cone having the under cone perforated, as
set forth.
2. The combination of pipe, hollow sphere, and perforations, as set forth.
3. The combination of pipe, upper cones, and wind-ways between said cones and
the pipe, and entering the latter, as set forth.
Dated this 30th date of Anril 1901
PHILLIPS & LEIGH,
22, Southampton Buildings, Chancery Lane, W.C.,
Agents for the Applicant.
PHILLIPS & LEIGH,
22, Southampton Buildings, Chancery Lane, W.C.,
Agents for the Applicant.