Improvements in Ventilators.
Year: 1890

page_text: Date of Application, 5th May, 1890
Complete Specification Left, 4th Feb., 1891-Accepted, 11th Apr., 1891
PROVISIONAL SPECIFICATIŪN.
Improvements in Ventilators.
I, MATTHEW RODGER, of 68, Mount Pottinger Road, Belfast, in the County
of Down, Ireland, Joiner, do hereby declare the nature of this invention to be as
follows:
The object of this invention is to provide a form of ventilator or head cowl or
hood for fixing to the top of a ventilating shaft for the purpose of withdrawing fonl
air smoke or gases from halls rooms holds of vessels factories sewers or other spaces
by means of an induced current caused by the admission of atmospheric air.
In carrying out my invention I provide a ventilating shaft terminating in a cap
or head which may either be rigidly fixed or of the revolving type-shaped as an
inverted U but having the inner leg thereof much shorter than the outer or central
leg covering the shaft.
The inner leg may be free to revolve round the central shaft if desired. This so
called inner leg is divided close to the crown by the end of a diaphragmatic device
which forms the top of the inverted U and being extended upwardly and down-
wardly is expanded to form the lower portion of a superimposed bell mouthed hood
or cowl the upper portion of which when continued in a downward direction
terminates sectionally in the outermost side of the short leg of the inverted cap
before mentioned so forming a separate downward passage through which the
atmospheric air passes inducing a current through the longer leg or main shaft of
the ventilator.
This diaphragmatic device is so arranged that any rain water or other moisture
that may enter the bell mouthed or other shaped top is conveyed to the inverted or
discharge end of the ventilating tube and so the water cannot enter the space or
apartment to be ventilated.
Dated this 5th day of May 1800.
POPPLEWELL & Co.,
17 & 18, Southampton Buildings, London, W.C.,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Ventilators.
I, MATTHEW RODGER, of 68, Mount Pottinger Road, Belfast, in the County
of Down, Ireland, Joiner, 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:-
The object of this invention is to provide a form of ventilator or head cowl or
hood for fixing to the tops of ventilating shafts or the like for the purpose of with-
drawing foul air smoke or gases from halls rooms holds of vessels factories sewers
or other spaces by means of an induced current caused by the admission of
atmospheric air.
In carrying out my invention I provide for the purpose of fixing to the top of a
ventilating shaft-a cap or head (which may be rigidly fixed or of the revolving
type) shaped as an inverted U but having the inner leg thereof much shorter than
the outer or central leg covering the shaft.
The inner leg may be free to revolve round the central shaft if desired.
This so called inner leg is divided close to the crown by the end of a diaphragmatic
device which forms the top of the inverted U and being extended upwardly and

page_text: downwardly is expanded to form the lower portion of a superimposed bell-mouthed
hood or cowl the upper portion of which when continued in a downward direction
terminates sectionally in the outermost side of the short leg of the inverted cap
before mentioned so forming a separate downsal passage through which the
atmospheric air passes inducing a current through the longer leg or main shaft of
the ventilator.
This diaphragmatic device is so arranged that any rain water or other moisture
that may enter the bell mouthed or other shaped top is conveyed to the inverted or
discharge end of the ventilating tube and so the water or moisture cannot enter the
space or apartment to be ventilated.
Referring to the accompanying drawings and to the figures and letters of reference
marked thereon,
Figure 1 inside elevation (with dotted section) of my improved cowl or head
having a revolving hell mouthed opening or inlet for atmospheric air.
Figure 2a front elevation and
Figure 3 a plan or horizontal section of the same.
Figuria side elevation (with dotted section) of a herd or cowl constructed
according to my invention but having a head or cowl terminating in a fixed hood
with vertical ribs for the mission of atmospheric air.
Figure 5 a plan or horizontal section and
Figure 6 a plan or section of the ribbed inlet.
Figures 1-2-3 show a revolving head or cowl mounted on the top or end of
the ventilating shaft A. so that the longer arm covers and embraces the same whilst
the shorter arm 1 is open to the atmosphere. In the upper portion of the head is
a downwardly curved diaphragm (which deflects the atmospheric air entering
through the superimposed bell mouthed opening B towards and out at the other
opening 1 so imlueing a current through A so drawing out foul or other air from
the shaft A. The arrows indicate the course of the induced and inducing
currents. A screw or other device E may be provided for fixing the cowl in
position.
Figures 4-5-6 shew a fixed head to shaft A carrying a hood with vertical
ribs through which the atmospheric air enters from any point from which the
wind blows.
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:
First In heads or cowls for ventilating shafts the use of an inner curved
diaphragm such as (for deflecting the incoming air for the purpose of creating an
induced current of font or outgoing air substantially as hereinbefore described.
Second: The improved construction and general arrangement of ventilators
substantially as hereinbefore described and as illustrated by the accompanying
drawings.
Dated this 4th day of F-L (AE
POPPLEWELL & Co.,
17 & 18, Southampton Buildings, London, W.C.,
Agents for the Applicant.