Improvements in Chimney Cowls.
Year: 1894

page_text: Date of Application, 7th Aug., 1894
Complete Specification Left, 7th May, 1595-Accepted, 8th June, 1895
PROVISIONAL SPECIFICATION.
Improvements in Chimney Cowls.
I, REGINALD HADDAN of the Firm of Herbert Haddan & Co., Patent Agents
of 18 Buckingham Street Strand W.C. in the County of London Civil Engineer
do hereby declare the nature of this invention, a communication to me from
abroad by Pierre Perrinon of 17 Rue de Plaisance, Asuiers in the Department of
the Seine, Republic of France, Manufacturer to be us follows:-
This invention relates to the construction of cowls for chimneys or shafts
intended to carry off smoke foul air or the like and the improvements are intended
to facilitate the outlet of the smoke or the like in spite of wind.
For this purpose the improved cowl is constructed of metal or earthenware with
a socket at the base to fit upon existing chimney pots or otherwise and above the
latter with a series of cylinders, truncated cones, or a spiral, or spirals concentric
with one another but so arranged one above the other in successively decreasing
diameters that between each cylinder, cone, coil of spiral, or spirals and the next
above, a horizontal or substantially horizontal annular orifice is left for the outlet
of smoke or the like, a circular orifice being at the apex of the whole. Suitable
radial ribs support the various parts and these ribs may divide the aunular orifices
aforesaid into segmental orifices.
The socket aforesaid, when made of metal may be slit to form spring-like leaves
adapted to press upon the outer surface of the chimney pot or the like and secure
the cowl in place.
The whole may be surmounted by a metal or other conical cap at a suitable
elevation above the aforesaid cylinders cones or spirals, the said cap having at its
apex a circular orifice and being also open at its base and hollow throughout.
Dated this 7th day of August 1894.
Improvements in Chimney Cowls.
I REGINALD HADDAN, of the Firm of Herbert Haddan and Co., Patent Agents
of 18 Buckingham Street Strand W.C. in the County of London, Civil Engineer
do hereby declare the nature of this invention a communication to me from
abroad by Pierre Perrinon of 17 Rue de Plaisance Asniers in the Department
of the Seine Republic of France, Manufacturer, 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 the present invention is to provide a cowl or hood for chimneys
by means of which any re-entering of smoke into the chimneys and from there into
the apartments or other rooms is prevented.
In order to properly understand the nature of this improved cowl, I have
represented the same in the annexed drawings in which
Fig. 1 is an elevation of a metallic chimney cowl,
Fig. 2 the plan view of the same with the cap removed,

page_text: Fig. 3 shows the same cowl in vertical section, the arrows 1 indicating the
direction of the entrance of the currents of wind, the arrows 2 the egress or outlet
of the smoke,
Fig. 4 represents a section of a cowl of earthenware.
As may be seen in the Figs. 1, 2, and 3 the base of these cowls has a cylindrical
shape adapted to pass into ordinary chimney pots B (Fig. 4).
To this cylindrical part or socket are secured by means of ties or bars a a series
of concentric slightly cone-shaped tubes these tubes being arranged so as to have
in their combination a step like appearance and to leave between them annular
spaces for the outlet of the smoke. The ties being metallic are prolonged beyond
the base A and so bent as to press against the side or wall of the chimney pot, and
so assure the solidity of the cowl on the latter.
This chimney cowl may be provided with a cap D which latter has a hole bin
its centre for a partial escape of the smoke passing through the uppermost tube..
The chimney cowl arranged as described breaks the wind of which only a trifling
quantity penetrates underneath each tube as the arrows 1 in Fig. 3 indicate, to
find egress on the opposite side thereby leading away the smoke as indicated by
the arrows 2. In the earthenware cowl the rings c and ties a are made in one piece
with the base A.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same to be performed I declare that what I
claim is :-
A chimney cowl comprising a combination of conical concentric tubes united by
means of ties or bars but arranged one above the other in successively decreasing
diameters and fixed on to a cylindrical base the latter passing into the chimney pot
and so supporting the whole combination; which chimney cowl may also be
provided with a cap having an orifice in its centre, the whole substantially as set
forth and illustrated.