Improvements in Ventilators or Air Extractors.
Year: 1895

page_text: Date of Application, 3rd July, 1895
Complete Specification Left, 2nd Apr., 1896-Accepted, 30th May, 1896
PROVISIONAL SPECIFICATION.
Improvements in Ventilators or Air Extractors.
I, GEORGE JABEZ BEEDHAM, 70 Glen Road, in the City of Sheffield, Engineer,
do hereby declare the nature of my invention to be as follows:-
My invention relates more particularly to ventilators which are specially adapted
for extracting vitiated air, smoke, and the like from railway carriages, for
ventilating provision cars, and for other analogous purposes.
When the vehicle upon which the ventilator is fixed is stationary, the appliance
acts as an ordinary ventilator or air escape, but when the vehicle is in rapid motion,
a stream of air passes through two opposite cones causing suction in a chamber
which is connected with one or more compartments of the vehicle.
In a passenger carriage for example, I prefer to fix the appliance upon the roof
of the carriage and centrally over the partition between two compartments and I
connect the lower part with each compartment, with means to open and close same
gradually.
In the portion or chamber above the roof which I make cylindrical, I fix centrally
and horizontally two open ended cones, a space being left between the two small
ends which are bell mouthed.
These ends are surrounded at some little distance by a sleeve or thimble enlarged
at both ends, and supported by stays so as to permit a free passage of air on all
sides and the top of the casing has a covered opening to permit the escape of air
when at rest.
The large outer ends of the cones are also protected from rain by semi-circular
eaves or shield.
Improvements in Ventilators or Air Extractors.
I, GEORGE JABEZ BEEDHAM, late of 70 Glen Road, but now of 461 Abbeydale
Road, Sheffield, in the County of York, Engineer, 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 :-
.
My invention relates more particularly to ventilators which are specially adapted
for extracting vitiated air, smoke and the like from railway carriages, for ventilating
provision cars and for other analogous purposes.
When the vehicle upon which the ventilator is fixed is stationary, the appliance
acts as an ordinary ventilator or air escape, but when the vehicle is in rapid motion
a stream of air passes through two opposite cones, causing suction in a chamber
which is connected with one or more compartments of the vehicle.
In a passenger carriage for example, I prefer to fix the appliance upon the roof
[D077

page_text: of the carriage and centrally over the partition between two compartments and I
connect the lower part with each compartment with means to open and close
gradually.
5410
Mution mil he hotton understood on reference to the accompanying sheet
connect the lower part with each compartment with means to open and close same
gradually.
My invention will be better understood on reference to the accompanying sheet
of drawings, in which,
Fig. 1, is a side elevation of my improved ventilator.
Fig. 2, is a plan of the same looking on the top.
Fig. 3, is a sectional elevation.
Fig. 4, is a sectional plan taken through the centre of the conical tubes..
Fig. 5, is a front elevation.
Fig. 6, is a plan.
Fig. 7, is a sectional elevation of a modified arrangement wherein the head of the
ventilator is made spherical instead of cylindrical, a disc formed cap to the suction
pipe is substituted for the thimble or sleeve previously illustrated, the top opening
being also omitted.
Fig. 8, is a plan of the same, half in section.
The same letters refer to similar parts throughout the several views.
In the portion or casing of the exhaust chamber, a, which I make cylindrical,
I fix centrally and horizontally two open ended cones, b, b, a space, c, being left
between the two small ends which are bell mouthed and opposite each other.
These bell mouthed ends are surrounded at some little distance by a sleeve or
thimble, d, which is enlarged at both ends and supported by stays, e, e, so as to
admit of a free passage of air on all sides.
The top or head of the casing of the exhaust chamber, a, is provided with a
covered opening, f, to permit the escape of air when the vehicle is at rest, it also
assists the action of the ventilator when in motion.
I sometimes provide the exhaust chamber, a, with a collar which fits over the
top of the exhaust pipe a¹ or with a socket which fits into the top of the exhaust
pipe, a', so that the said exhaust chamber, a, may be turned in any direction, or I
fit it with any of the ordinary means in use by which ventilating cowls are actuated
automatically by the wind or currents of air.
The inlets to the large outer ends of the cones, b, b, are also protected from rain
by semi-circular eaves or shields, g, g, formed by extending the upper portion of
the cones, b, b, beyond the casing, a. h, is a cone shaped collar which I place on
the top of the exhaust pipe, a¹, by which any wet which may find its way into the
casing, a, of the head of the ventilator, may be directed through the orifices, i, i,
onto the roof, m, of the carriage clear of the exhaust pipe, a'. This cone shaped.
collar, h, also directs a current of air upwards into the exhaust chamber of the
ventilator, thereby assisting the extraction of the vitiated air out of the suction
pipe, a. j. is the partition between two compartments of a vehicle and, k, k, are
ventilating grids which can be regulated from either' compartment.
In Fig. 7, which represents a modified arrangement of my improved ventilator,
a, is the spherical shaped bead substituted for the cylindrical formed head, l, is the
disc formed cap to the suction pipe, substituted for the thimble or sleeve, d,
previously illustrated. The coues, b, b, are made with plain ends instead of being
bell mouthed and, k, represents a ventilator grid or slide which I employ when one
compartment only has to be ventilated.
The action of my improved ventilator is indicated by the arrows, those passing
horizontally through the cones, b, b, and those impinging on the collar, h, represent
currents set up by the movement of the vehicle in an opposite direction.
The dotted arrows represent the currents of vitiated air, which are induced to
rise upwards through the exhaust pipe, a¹, into the casing of the exhaust chamber,
and thence through the space, c, into the rear cone, b, from which it is discharged
by the action of the horizontal currents into the atmosphere.
The sleeve, d, acts as a shield to prevent down draughts or wet entering the
exhaust pipe, a', the disc formed cap, l, in Fig. 7, I employ for the same purpose.

page_text: 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.
(1.) In ventilators or air extractors, the arrangement and combination of parts
and appliances, comprising two open ended conical tubes fixed horizontally and
concentrically with each other, their small ends being opposite and a little distance
apart so as to leave an air space between the two, such conical tubes being fixed
in a cylindrical casing forming an exhaust chamber provided with suitable inlets
and outlets and placed above a vertical exhaust pipe, the space between the small
ends of the conical tubes being surrounded by a thimble or sleeve for the
prevention of down draught and incursion of wet, an annular air space being
left between the said thimble or sleeve and the conical tubes, an air space being
also left between the said thimble or sleeve and the outlet of the exhaust pipe,
the large end of one of the conical tubes being placed or directed, when in use,
so as to face the wind or air currents by which the exhaust action of the
apparatus is stimulated, in the manner and for the purposes substantially as herein
described and illustrated.
(2.) In ventilators or air extractors, the arrangement and combination of parts
and appliances comprising two open ended conical tubes fixed horizontally and
concentrically with each other, their small ends being opposite and a little distance
apart so as to leave an air space between the two, such conical tubes being fixed
in a spherical casing forming an exhaust chamber provided with suitable inlets and
outlets, and placed above a vertical exhaust pipe, the end of the exhaust pipe
inside the exhaust chamber being covered with a disc shaped cap, leaving an air
space for the escape of the vitiated air from the pipe and also leaving a space
between such disc or cap and the small ends of the conical tubes, the disc or cap
being so placed over the end of the exhaust pipe for the prevention of down-
draught and incursion of wet, the large end of one of the conical tubes being
placed or directed, whep in use, so as to face the wind or air currents by which
the exhaust action of the apparatus is stimulated, in the manner and for the
purposes substantially as herein described and illustrated.
Dated this 27th March 1896.
R. HEBER RADFORD,
Agent for the Applicant.