Improvements in Air Extractors or Ventilators for Railway and other Carriages and the like.
Year: 1897

page_text: Date of Application, 16th Mar., 1897
Complete Specification Left, 16th Dec., 1897-Accepted, 5th Feb., 1898
PROVISIONAL SPECIFICATION.
Improvements in Air Extractors or Ventilators for Railway and
other Carriages and the like.
We, FRANK BRACEBRIDGE MILLS, of 60, Hatton Garden, E.C., in the County of
London, and WALTER KERR, Engineers, of 7, St. Anne's Terrace, Harlesden, in
the County of Middlesex, do hereby declare the nature of this invention to be as
follows:
-
This invention for improvements in air extractors or ventilators for railway
and other carriages and the like has for its object an air extractor that shall draw
air from the space or compartment to which it is connected irrespective of
position, direction of travel and direction of the wind, and shall not project
materially from the outer frame or casing or door of the space or compartment,
and shall be steady notwithstanding gusts or sudden movements and shall not
be liable to indrafts; and consists in a hollow hemispherical or similar concave
curved body having a slot or opening extending partially around its greatest
circumference or apex at right angles to its base, and of an exterior guard ring
secured to the body and surrounding the slot at some distance therefrom and
projecting beyond the edges of the slot. The base is placed on a side of the com-
partment or on the door and the interior of the body of the ventilator communi-
cates by an opening or pipe with the interior of the compartment. The whole
apparatus can be cast in one piece.
The edges of the slot may project slightly towards the guard ring and a channel
may be formed below the slot within the ventilator to catch rain or other water.
The opening leading to the compartment may be provided with a valve closing
automatically when the vehicle is not in motion and the wind is slight and also
when the outflow is excessive, or the opening may be covered with gauze.
Dated this 16th day of March 1897.
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.
Improvements in Air Extractors or Ventilators for Railway and
other Carriages and the like.
We, FRANK BRACEBRIDGE MILLS, of 60, Hatton Garden, E.C., in the County of
London, and WALTER KERR, of 7, St. Anne's Terrace, Harlesden, in the County of
Middlesex, Engineers, do hereby declare the nature of this invention and in what
[Pic d

page_text: manner the same is to be performed, to be particularly described and ascertained
in and by the following statement:-
=
This invention for improvements in air extractors or ventilators for railway
and other carriages and the like has for its object an air extractor that shall draw
air from the space or compartment to which it is connected irrespective of position,
direction of travel and direction of the wind, and shall not project materially from
the outer frame or casing or door of the space or compartment, and shall be
steady notwithstanding gusts or sudden movements, and shall not be liable to
indrafts; and consists in a hollow hemispheroidal or similar dome shaped body
having a slot or opening extending partially around its greatest circumference
through its apex, and of an exterior guard ring secured to the body and surround-
ing the slot at some distance therefrom and projecting beyond the edges of the
slot. The base is placed on a side of the coinpartment or on the door and the
interior of the body of the ventilator communicates by an opening or pipe with
the interior of the compartment. The whole apparatus can be cast in one piece.
The edges of the slot may project slightly towards the guard ring and a channel
may be formed below the slot within the ventilator to catch moisture condensing
or other water.
The opening leading to the compartment may be provided with a valve
closing automatically when the vehicle is not in motion and the wind is slight
and also when the outflow is excessive or the opening may be covered with
gauze.
In the accompanying 3 sheets of illustrated drawings: Figs. 1 and 2 are
central vertical sections at right angles to one another of a ventilator constructed
according to this invention suitable more especially for the roofs of railway
carriages, and Fig. 3 is a plan of the same. Figs. 4, 5 and 6 are similar views to
Figs. 1, 2 and 3 showing a similar roof ventilator with a contracted base. Fig. 7
is a vertical section of a ventilator suitable more especially for the sides or doors
of railway carriages, and Fig. 8. is a modification of the same. Figs. 9, 10, 11
and 12 are respectively front elevation, plan, and vertical sections at right angles
to one another of a modified construction of roof ventilator. Figs. 13, 14 and 15
are front view, a plan and vertical section of a door or side ventilator.
b
The ventilator, Figs. 1, 2 and 3, cast in one piece comprises the splayed base a,
the hollow hemispheroidal body provided with a slot c'and the guard d extend-
ing from one side of the base a to the other and surrounding the slot c. In the
modification shown in Figs. 4, 5 and 6 the base a is contracted. The slot e accord-
ing to this invention is about or less than a semicircle or half a polygonal figure.
The body gradually widens out from its apex to its base. By this construction
not only is the height of the ventilator considerably reduced in comparison with
existing ventilators but also the ingress of air is more effectually prevented whilst
there is free and silent egress. As shown the roof ventilator is provided with a
channel e to catch and drain off water collecting on the undersurface of the dome.
The door or side ventilator shown in Fig. 7 is provided with a channel and out-
let g for the same purpose. The door or side ventilator shown in Fig. 8 differs
slightly from that shown in Fig. 7. It is also shown provided with partitions hi
as a safeguard against the ingress of moisture. In the modified roof ventilator
shown in Figs. 9 to 12 the ventilator is shown made up of two castings separately
fixed to the roof by the screws 1, the correct position of the two parts being secured
by the lugs m. The section of the guard ring is also, modified as shown and it
may be stamped from sheet metal. Figs. 13 to 15 show a door or side ventilator
with a separate guard ring showing also a further modified section, of the guard
ring.
The form of the hollow slotted body described as liemispheroidal is such that
the linear dimensions of the slotted part of the base are preferably considerably
greater than the height, and that it gradually widens from the apex towards this
base. It may be the half a polygonal figure having plane faces so long as it
approaches to a semispheroidal or ellipsoidal figure and does not exceed the half

page_text: figure although it may be considerably less than the half. The body beyond the
slotted portion may be continued according to special circumstances to fit a sloping
roof or the like.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we would have it
understood that we do not desire to claim a ventilator consisting of a curved
hollow body having a slot protected by a guard ring, but what we claim is:-
1. A ventilator consisting of a hollow semispheroidal body, or body widening
out from its apex to its base, having a slot or opening extending nearly from side
to side through its apex, and of an exterior guard ring extending from side to
side of the base and surrounding the slot at some distance therefrom and projecting
beyond the edges of the slot.
2. The ventilators substantially as described with reference to the drawings.
Dated this 16th day of December, 1897.
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.