Improvements in COWIS.
Year: 1895

page_text: Date of Application, 13th Sept., 1895
Complete Specification Left, 8th May, 1896-Accepted, 13th June, 1896
Improvements in COWIS.
1, WILLIAM HARRISON, of 35, Burleigh Road, Kentish Town, in the County
of London, Gunmaker, do hereby declare the nature of this invention to be as
follows:-
My invention relates to cowls chiefly designed for preventing chimneys from
smoking but also applicable for use for ventilating purposes.
A cowl constructed according to my invention has two plates arranged to
work in conjunction with the tube or shaft of the cowl in somewhat the manner
of a universal joint one plate being pivoted on the shaft so that it can oscillate
and having its lower edge shaped so that when inclined in one or the other direction
it will fit against the inner circumference of the shaft on one or the other side of
the pivots. The other or second plate is pivoted upon the first plate and is also
so shaped at its lower edge that it will, like the first plate, bear against the
inner side of the shaft. In practice the portions of the plates above the pivots
are made of larger area than the portions below so that the impingement of the
wind against the said plates will cause them to oscillate to close the side of the
shaft towards the wind. The upper part of the second plate advantageously carries
a cap or crown which will facilitate the operation of the cowl under the action
of a downward wind, and the lower end of the plate is advantageously weighted to
retain the plates in a vertical position when there is no wind.
I sometimes make the lower part of the shaft of my cowl with parts of varying
diameter so as to permit of its attachment to chimney pots of various sizes.
Dated the 13th day of September 1895.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
I, WILLIAM HARRISON, of 35, Burleigh Road, Kentish Town, in the County
of London, Gunmaker, 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 cowls chiefly designed for preventing chimneys from
smoking but also applicable for use for ventilating purposes.
A cowl constructed according to my invention has two plates arranged to work
in conjunction with the tube or shalt of the cowl in somewhat the manner of a
universal joint, one plate being pivoted on the shaft so that it can oscillate and
having its lower edge shaped so that when inclined in one or the other direction
it will fit against the inner circumference of the shaft on one or the other side of
the pivots. The other or second plate is pivoted upon the first plate and is also
so shaped at its lower edge that it will, like the first plate, bear against the inner
side of the shaft.

page_text: To enable my invention to be fully understood I will describe the same by
reference to the accompanying drawings, in which :-
Figure 1 is an elevation of my improved cowl:
Figure 2 is a sectional elevation of the upper part of the same :
Figure 3 is a plan :
Figure 4 is a section on the line 4-4, Figure 2; and,
Figure 5 is a section on the line 5-5, Figure 4.
a is the tube or shaft of the cowl, and b, c are the two plates which serve for
preventing the wind from blowing down the tube or shaft, the plate having
fixed to it knife-edges, carried in V-shaped bearings d, d fixed to projections e
on the upper part of the tube a, whilst the plate c is formed in two parts united
by a knife-edge f working in a V-shaped bearing g attached to the plate bon opposite
sides of the hole f¹. A plate / carrying a series of wind catchers i, and forming
the cap herein before referred to, is also attached to the two parts of the plate c
and serves with the knife-edge for retaining the two parts of the said plate c in
position. A slot j is formed in the plate h through which the upper edge of the
plate passes, as clearly shewn in the several figures of the drawings.
b
With the construction herein before described it will be understood that the
lower edges of the plates b and c are so shaped that, if say for instance the
plate bis moved to the position indicated by the dotted lines in Figure 1, its
lower part will bear against one side of the tube a whilst, when the plate c is
subjected to pressure, it will move to the position indicated by the dotted lines
in Figure 4.
In practice the lower parts of the plates are weighted as, for instance, at k, k so
as to retain the plates in a vertical position when there is no wind. It will be
understood that when the plates are in this position, the smoke or air passing
through the cowl will escape through the four quadrantal openings formed by
the plates b, c as shewn in Figure 5, and that when the wind strikes the cowl one
or both of the plates, according to the direction of the wind, will be caused to
oscillate in order to close that side of the tube against which the wind strikes thereby
preventing a down draught.
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. A cowl wherein two plates are pivoted one upon the other and supported in the
tube or shaft of the cowl in such a manner that under the action of the wind the
said plates will be caused to oscillate in order to close that side of the tube or shaft
against which the wind strikes, substantially as described.
2. The manufacture and use of a cowl substantially as hereinbetore described and
illustrated in the accompanying drawings.
Dated this 8th day of Man 1000
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.