Improvements in Cowls for Chimney Pots, Ventilating Shafts, and the like.
Year: 1896

page_text: Date of Application, 12th May, 1896-Accepted, 26th Sept., 1896
COMPLETE SPECIFICATION.
Improvements in Cowls for Chimney Pots, Ventilating Shafts,
and the like.
I, LUCIAN PITSCH of Wanzleben near Magdebourg in the Empire of Germany,
Government Commissioner of Buildings 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 :-
This invention relates to a cover or cowl for chimney pots, ventilating shafts,
waste pipes, lanterns and the like, and has for its object to so deflect winds which
may strike them obliquely that they are rendered harmless to the pipes, and also
to cause the winds which strike them horizontally to exert a suction action on the
pipes. The cowl or cover is also intended to prevent the deleterious action of the
sun's rays on the pipes.
In order to attain the above object the cover or cowl is preferably widened in its
upper part and a series of tubes inserted in the widened part, which series of tubes
is for instance connected with two horizontal plates, the lower one of which lies
within the extension or widened part, whilst the upper one covers the widened
part and projects all round. A double cover plate is arranged over the upper plate
at a suitable distance, and is connected by nozzles or pipes with the upper plate of
the series of tubes.
In the accompanying drawings
Figure 1 is an elevation of the cover or cowl,
Figure 2 a partial elevation and partial vertical section, and
Figure 3 a plan of the upper plate with the pipes.
The cover or cowl a contains in its upper widened part 6 a series of tubes c which
are fixed at one end in the plate 62 lying within the widened part and at the other
end in the upper larger plate 61, which latter covers the part 6 of the cowl and
projects beyond it all round. A double cover plate d is connected with the series of
tubes c by means of short tubes e, which latter merely act as stays or supports for
said cover plate.
In consequence of this arrangement, winds striking the cowl obliquely are
deflected by the plate 6' in such a way that, passing over the openings, they, by
reason of the series of tubes, exert on the chimney a suction action in the same
way as do horizontal winds.
In order that the action of winds which strike the cowl at too great an angle
may be sufficiently deflected by the plate 6 and in order further that the action of
the sun's rays on the chimney put pipe may be rendered innocuous, a double cover
plate d is arranged. By means of this plate the heating of the space between the
tube connection and the cover plate produced by the sun's rays is diminished and
thereby rendered innocuous as regards the carrying off of the smoke, whilst winds
descending vertically downwards are prevented by the said plate from penetrating
into the series of tubes and are forced to pass by downwards in the space between
the cover plate and the series of tubes so that they also have a suction action on
the chimney. The cover plate is placed at such a distance from the series of tubes
that the smoke can unimpededly escape from the latter.
For the purpose of assisting the carrying off of the smoke and in order to
increase the draught, short oblique downwardly directed tubes are arranged, as
shown in dotted lines in Figures 1 and 2 on the side of the cowl just below
the series of tubes. These oblique tubes may be of any suitable form and
section.

page_text: The cowl may be employed for any other ventilating pipe, besides chimneys, for
assisting ventilation, also for any other discharge pipe, lanterns or the like, and
may be made rectangular, polygonal or circular according to the shape of the
chimney pot or ventilating pipe or the like.
It is not always necessary to have a widening of the upper part of the cowl nor
to use a double cover plate. Figures 4-6 show such a modified form of
construction. In this arrangement the plate is also omitted, which plate is not
essential for the principle of the invention and may therefore if desired be also
omitted in the case shown in Figures 2 and 3.
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:-
A cowl for chimney pots, ventilating pipes, lanterns and the like having a single
or double cover plate, characterized by a series of tubes (c) firmly connected with
a plate (1) covering the cowl, shid tubes being so arranged in the upper part of
the cowl that winds passing over the tube plate (61) exert a suction action on the
chimney or pipe, whilst the cover plate (d) deflects vertically descending winds or
causes them to exert a suction action substantially as described.
Dated this 11th day of May 1896.
WM. P. THOMPSON & Co.,
Of 6 Lord Street, Liverpool, Agents for the Applicant.