An Improved Ventilating Cowl.
Year: 1891

page_text: Date of Application, 15th May, 1891-Accepted, 20th June, 1891
COMPLETE SPECIFICATION.
An Improved Ventilating Cowl.
I, JOHN DANIEL FRYER of Top of Ship Street Brecon Ironmonger, 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 consists of a ventilating or extracting cowl which is chiefly
intended for use on the top of the ventilating pipe, arranged to ventilate drains,
sewers, etc.
The extractor is circular on plan and considerably larger in diameter than the
pipe to which it is fitted, the top of the circular body is covered with perforated
zine, or other suitable metal, and above this covering is carried on short legs a
conical shaped termination having a closed base and fitted with an ornamental
terminal. The circular body before mentioned is pierced with openings partially
covered with hoods and the number of these openings to the interior of the circular
body is regulated in accordance with the draft required.
Inside the circular body before mentioned is fitted a truncated cone, the upper
orifice of which is smaller in diameter than the pipe to which the ventilator is
fitted.
In order that my invention may be more fully understood, I will now proceed to
describe the figures on the sheet of drawings hereunto annexed, and which are
marked with like letters of reference throughout.
Figure 1 is a sectional elevation taken through the diametrical centre of my
improved extracting cowl and Figure 2 is a sectional plan (looking down) taken
through the lines X X of Figure 1.
A is the circular body of the ventilator. B is the ventilating pipe to which it is
attached. CC are the hooded openings into the body of the ventilator. D is the
truncated cone whose top opening is less in superficial area than the sectional area
of the ventilating pipe. E is the perforated cover to the circular body of the cowl.
F is the cone shaped head having the enclosed base G. H H are the legs carrying
the conical head.
The action of my cowl will be easily understood. When the wind blows against
the cowl it will pass into the hooded openings, and impinging upon the outside of
the truncated conc, it will be thrown against the base G of the conical hood and
pass out again into the atmosphere, and the action of the air so passing will
have a tendency to create a vacuum within the interior of the truncated cone the
top opening of which as before mentioned is less in sectional area than that of the
pipe B, thus the air will be extracted by the ventilating pipe.
I manufacture my improved cowl in stout sheet metal of necessary thickness and
with soldered or rivetted joints as may be most desirable.
Having now fully 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. An improved ventilating cowl for extracting foul air arranged and constructed
substantially as hereinbefore described in the Specification and illustrated by the
accompanying drawings.
2. In an improved extracting cowl as hereinbefore described, the truncated
cone D whose upper opening K is smaller in sectional area than the sectional area
of the ventilating pipe to which the improved cowl is fitted.
3. In an improved ventilating cowl, the combination of the perforated body A

page_text: with the truncated cone D, and the perforated covering E arranged and constructed
substantially as hereinbefore described and illustrated by the accompanying
drawings.
Dated this 15th dex of Mev 1901
RAYNER & CASSELL,
37, Chancery Lane, W.C., Agents for the Applicant.