Improvements in Ventilators or Air Extractors for Railway Carriages or similar Vehicles.
Year: 1897

page_text: Improvements in Ventilators or Air Extractors for Railway
Carriages or similar Vehicles.
GEORGE MASSEY, No. 9, Dunstall Road, Wolverhampton, Coach Body Maker, do
hereby declare the nature of this invention to be as follows:-
It consists in the particular form and arrangement of parts so shaped and hinged
and working together for the extraction of air from the inside of a railway
carriage or other similar vehicle in the way or manner hereafter described.
This air extractor is in form or shape somewhat similar to the ridge tile of a
house but with closed ends and is placed a little distance above the roof of a
railway carriage over an opening through the roof. It is hinged or in any other
way hung at its top corners in such a manner that it will swing by the pressure of
the wind. When the carriage is running the pressure of the wind on the windward
or leading side of this ventilator or air extractor presses that side down until it
touches the roof of the carriage, in that way overbalancing and lifting up the
opposite or rear side of the ventilator some distance from the top of the roof of the
carriage, thus making a clear wide opening between the outside atmosphere and the
hole in the carriage roof so that when the carriage running a partial vacuum is
created in the rear of the ventilator which draws air out of the inside of the
carriage. And to assist in pressing the forward or windward side of the ventilator
close down on to the roof I place wings or projections at each end of the ventilator
for the passing wind to strike against.
Improvements in Ventilators or Air Extractors for Railway
Carriages or similar Vehicles.
I, GEORGE MASSEY, No. 9, Dunstall Road, Wolverhampton, Coach Body Maker,
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 in the particular form arrangement and combination
of parts so shaped and hinged and working together for the purpose of extracting
air from the inside of a railway carriage or other similar vehicle in the way or
manner hereinafter described.
The top part of this air extractor is in form or shape somewhat similar to
the ridge tile of a house but with closed ends and preferably is placed above
the roof of a railway carriage or other vehicle over an opening through the
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page_text: roof. It is hinged, or in any other way hung at its top corners in such a manner
that it will swing by the pressure of the wind.
When the carriage is running the pressure of the wind on the windward or
leading side of this ventilator or air extractor presses that side down until it
touches the roof of the carriage in that way overbalancing and lifting up the
opposite or rear side of the ventilator some distance from the top of the roof of
the carriage thus making a clear wide opening between the outside atmosphere
and the hole through the carriage roof so that when the carriage is running a
partial vacuum is created in the rear of the ventilator which draws air out
of the inside of the carriage. And to further assist in pressing the forward or
windward side of the ventilator close down upon the roof of the carriage I place
wings or projections at each end of the ventilator for the passing wind to strike
against.
The accompanying drawing will further illustrate my invention. Fig. 1 shows
my ventilator or air extractor in the position it will be when the carriage is
standing still. Fig. 2 shows its altered position when the carriage is running,
and Fig. 3 is a cross section view showing the wings or projections at the ends
of the ventilator.
A in Figs. 1, 2 & 3 shows the hinge or joint upon which the ventilator
swings. B is the ventilator top. C is the roof of the carriage. D is the opening
or hole through the roof over which the ventilator or air extractor is placed.
E are the brackets which support the top part B and to which it is hinged. F
are the wings for assisting to close the ventilator on the windward side and
so it follows that when a carriage fitted with these ventilators is running the
resistance or pressure of the atmosphere on the leading side of the ventilator
presses it down onto the roof as shown in Fig. 2 and lifts up the rear side
making a wide opening and the partial vacuum formed there draws the air
in the direction indicated by the arrow out of the inside of the carriage through
the opening D.
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 ventilator
or air extractor for railway carriages and other vehicles
substantially as described in the above specification and shown in the drawings
Fig. 1, 2 & 3.
Dated this 9th day of May 1898.