Improvements in Cowls or Caps for Preventing Downdraught in Ventilating Shafts, Flues, and other Analogous Constructions.
Year: 1890

page_text: Date of Application, 27th June, 1890
Complete Specification Left, 28th Mar., 1891-Accepted, 2nd May, 1891
PROVISIONAL SPECIFICATION.
Improvements in Cowls or Caps for Preventing Downdraught in
Ventilating Shafts, Flues, and other Analogous Constructions.
I, JOHN WATSON, of St. Albans in the County of Herts, Florist, do hereby
declare the nature of my said invention to be as follows:-
The object of my invention is to effect improvements in the construction of cowls
or caps, for preventing downdraught, in ventilating shafts, flues, and other analogous
constructions.
My invention consists of several concentric cylinders. The inner cylinder is
closed at each end, and is fitted with three, four, or more vertical radial plates,
connecting the inner cylinder with an intermediate concentric cylinder; and this
latter cylinder is in like manner connected with the outer cylinder by three, four,
or more radial plates. The top of the outer cylinder is fitted with a closed cover,
and surmounted by a conical roof; and the lower end of the same cylinder is fitted
with an annular cover, which is supported by a smaller cylinder connecting the
apparatus with the flue to be ventilated. Openings are made in the upper part of
the outer cylinder, and in the lower annular cover, for the passage of air and gases
or foul air.
The intermediate cylinder is shorter than the outer cylinder, and is supported
by the lower cylinder and the radial plates.
The lower cylinder is supported by an annular plate, forming a flange thereto,
which may be screwed, or otherwise secured, to the flue or other structure.
The upper half (more or less) of the inner intermediate cylinder, is pierced with
a number of holes for the passage of foul air and gases from the flue below. Four
small vertical tubes are fitted inside the intermediate cylinder, to admit cold air
from the lower part of the outer cylinder, and assist in carrying the currents
upwards. A lip is also formed on the annular plate at the bottom of the
intermediate cylinder, which prevents condensed liquid, from the foul gases, returning
to the flue.
The lower cylinder which supports the apparatus, may also be fitted with a
gallery for receiving water or condensed fluid, collecting in the apparatus.
The whole of the upper part of the apparatus may be made detachable, by
screws, bayonet joints, or other suitable means, for the purpose of cleansing or
repairing the same.
My invention is also applicable as a ventilator and wind shield for the lamps of
railway carriages and other purposes.
Dated 27th June 1890.
GEO.
DOWNING,
8, Quality Court, London, W.C., Agent.
COMPLETE SPECIFICATION.
Improvements in Cowls or Caps for Preventing Downdraught in
Ventilating Shafts, Flues, and other Analogous Constructions.
I, JOHN WATSON, of St. Alban's, in the County of Herts, Florist, do hereby
declare the nature of my said 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 effect improvements in the construction of cowls

page_text: or caps for preventing downdraught in ventilating shafts, flues, and other analogous
constructions.
My invention consists of several concentric cylinders.. The inner cylinder is
closed at each end, and is fitted with three, four, or more vertical radial plates,
connecting the inner cylinder with an intermediate concentric cylinder; and this
latter cylinder is in like manner connected with the outer cylinder by three, four,
or more other vertical radial plates. The top of the outer cylinder is fitted with a
closed cover, and surmounted by a conical roof; and the lower end of the same
cylinder is fitted with an annular cover, which is supported by a smaller cylinder
or conoidal or other suitable connection with the flue to be ventilated. Openings
are made in the upper part of the outer cylinder, and in the lower annular plate for
the passage
of air and gases. The intermediate cylinder is somewhat shorter than
the outer cylinder, and a portion of the same cylinder is perforated with a number
of holes.
The whole of the upper part of the apparatus may be made detachable, by
screws, bayonet joints, or other suitable means, for the purpose of cleansing or
repairing the same.
My invention is also applicable as a ventilator and wind shield for the lamps of
railway carriages, and for other analogous purposes.
And in order that my said invention may be particularly described and
ascertained, reference is hereby made to the accompanying drawings, in which
similar letters of reference indicate corresponding parts.
Fig. 1 is an elevation, partly in section; and Fig. 2 is a horizontal view, partly
in section on the line 1-2 of Fig. 1.
e,
a is a hollow conoidal connection between the flue and the cowl, secured by
screws, or otherwise. This is carried up so as to form an annular lip to
prevent condensed liquid, from the foul gases, returning to the flue. d is an annular
plate supported by the cone a, to which the outer cylinder e is united. This outer
cylinder is perforated all round the top with a row of holes s. f is a horizontal
plate covering the cylinder and is the conical roof. h is the intermediate
cylinder, which is perforated with a number of holes, as shown. k is an annular plate
attached to the intermediate cylinder and to the conoidal support a. m is the inner
cylinder, closed at each end, as shown, n is a curved plate covering the cylinders h
and m.
oo are radial plates supported by the square plate p and serving to divide
the space enclosed by the cylinder into four parts." rrare other radial plates
placed between the cylinders e and h, dividing the annular space into four parts.
The foul air and gases from the flue pass upwards into the intermediate cylinder h,
and through the perforations in into the spaces enclosed by the outer cylinder;
from which they pass upwards and outwards by holes s formed in the outer
cylinder e, or downwards and outwards by the holes v and the annular slot t formed
in the plate d, through which openings condensed liquid is also carried away.
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 :-
The improvements in cowls or caps for preventing downdraught in ventilating
shafts, flues, and other analogous constructions, substantially as herein before
described and illustrated by the drawings..
Dated 26th Manah 1001
GEO.. DOWNING,
8, Quality Court, London, W.C., Agent for Applicant.
GEO. DOWNING,
8, Quality Court, London, W.C., Agent for Applicant.