Improvements in Chimney Cowls.
Year: 1892

page_text: Date of Application, 2nd Apr., 1892
Complete Specification Left, 29th Dec., 1892-Accepted, 11th Mar., 1893
PROVISIONAL SPECIFICATION.
Improvements in Chimney Cowls.
WILLIAM WAGHORNE of Stettin Lodge Selhurst Road South Norwood in the
County of Surrey Timber Merchant do hereby declare the nature of this invention
to be as follows:-
The object of my invention is to make in a simple form without any moving
parts an up draught chimney cowl so formed that the greater the horizontal
pressure of wind or down draught from the exterior the greater up draught it will
cause in the chimney to which the cowl is attached and to carry my invention into
effect I construct my improved cowl as follows:-
I make an ordinary tube to fit over the present chimney pot or attach to it a
base to attach to a chimney stack, this tube preferably make slightly conical
tapering to the top at a convenient distance from the top I construct on the outside
of the tube a spiral plane also slightly conical converging upwards and inwards
similar to an Archimedean screw this spiral piece is affixed round the tube like a
very large screw, and this spiral part is carried round and upwards to a convenient
distance above the top of the tube according to the size, for an ordinary size about
eighteen inches or two feet. The pitch of the screw is preferably formed so that
the outside of the upper thread or fin is just below the horizontal line of the top of
the cone of the one beneath. Strengthening pieces are preferably attached running
up through the whole of the series in about three places near the peripheries, and
the end of the spiral at the top is connected preferably to the next lower one for
strength or is carried on horizontally to meet it so as to form a strong finish not
liable to damage. It will be seen that the spiral above the top of the tube forms
a hollow conical spiral so that whichever side the wind strikes it from the outside
the current of air is diverted in an upward direction through the centre hollow
part of the spiral thus creating an up draught, of a force varying with the pressure
of the external current of air.
Various modifications may be made.
The cowl may be made of any suitable material, metal earthenware, papier mache
or the like and may be made round square octagonal or other suitable shape.
H. T. TALLACK,
10, Great Turnstile, Holborn, W.C., Agent for Applicant.
COMPLETE SPECIFICATION.
Improvements in Chimney Cowls.
WILLIAM WAGHORNE of Stettin Lodge Selhurst Road South Norwood, in the
County of Surrey, Timber 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 :-
The object of my invention is to make in a simple form without any moving
parts an up draught chimney cowl so formed that the greater the horizontal
pressure of wind or down draught from the exterior, the greater up draught it will
cause in the chimney to which the cowl is attached; and to carry my invention
into effect I construct my improved cowl as follows:-
I make an ordinary tube to fit over the present chimney pot or attach to it a
base to attach to a chimney stack in place of an ordinary chimney pot, on the top
of the tube I construct a spiral conical plane converging upwards and inwards
ונNISS

page_text: similar to an Archimedean screw this spiral is fixed to the tube and is carried round
and upward to a convenient distance above the top of the tube according to the
size, for an ordinary size about eighteen inches or two feet. The pitch of the
screw is preferably formed so that the outside of the upper thread or fin is just
below the horizontal line of the top of the cone of the one beneath. Strengthening
pieces are preferably attached running up the whole of the series in about three
places the end of the spiral at the top is connected preferably to the next lower
one for strength or is carried on horizontally to meet it so as to form a strong finish
not liable to damage. It will be seen that the spiral above the top of the tube
forms a hollow conical spiral so that whichever side the wind strikes it from the
outside, the current of air is diverted in an upward direction through the centre
hollow part of the spiral, thus creating an up draught of a force varying with the
pressure of the external current of air.
The cowl may be made of any suitable material; metal, earthenware, papier
mache, or the like, and may be round, square, octagonal or other shaped, and
applied to any shaped tube or fitting of chimneys, ventilating pipes, soil pipes and
the like, and a suitable cap for keeping out wet may be fitted if desired.
In the accompanying drawings
Fig. 1 is an elevation of my improved chimney cowl.
Fig. 2 is a sectional elevation, and Fig. 3 shows the cowl fitted with short tube
only to fit over an ordinary chimney pot or ventilating pipe.
Fig. 4 shows the method of fitting to an ordinary chimney pot using the bars
connecting the helix together for this purpose by bringing them down or cranking
them to fit over the chimney pot to which they are secured by a metal band or
bands.
Fig. 5 shows the upper part of cowl fitted with cap as described.
Similar letters denote corresponding parts throughout the drawings-
A A A A A is the helix or hollow conical screw plane B B B are the bars for
holding the helix in position securely and strengthening same also for attaching to
C is the metal tube to form the
chimney pot when extended as shown in Fig. 4.
chimney pot with flange D to secure it to the chimney stack E. F is the short
tube fitting for attaching the top only to ordinary chimney pots or ventilators
G. G. are the iron bands for securing bars B to chimney pots or ventilators, and
the like as shown in Fig. 4. C' is the ordinary chimney pot or ventilating pipe
to which the cowl top is attached.
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 with chimney pots or ventilating pipes of cowls made with a
coned hollow spiral or helix extending above the top of the chimney pot or
ventilating tube so formed that the outer part of each cone is just below the
horizontal line of the top inner part of the next spiral of the cone below it.
2. The combination with coned helical chimney cowls of strengthening bars or
connecting pieces B. to support and strengthen the fitting.
3. The method in combination with coned helical chimney or ventilating cowls
of attaching the cowl only to ordinary chimney pots or ventilating pipes as shown
in Figs. 3 & 4.
4. The combination with the foregoing of a protecting cap as shown in Fig. 5.
5. The improved chimney or ventilating cowl substantially as described and
illustrated in the accompanying drawings.
Dated this 29th day of December 1892.
H. T. TALLACK,
10, Great Turnstile, London, W.C., Agent for Applicant.