Improvements in Ventilators and Chimney Cans.
Year: 1894

page_text: Date of Application, 29th June, 1894
Complete Specification Left, 26th Mar., 1895-Accepted, 4th May, 1895
Improvements in Ventilators and Chimney Cans.
I, ALEXANDER MARSHALL, of 22 Jamieson Street, Govanhill, Glasgow,
Architect, do hereby declare the nature of this invention to be as follows:-
This invention relates to ventilators and chimney cans and it has for its object to
improve the updraught and to lessen or entirely prevent downdraughts.
In carrying out my invention I make the can or ventilator with a preferably
cylindrical body and I solder or otherwise secure right round the outer circum-
ference of this body a number of short tubes or pipes which are open at their
lower ends, and, at their upper ends, communicate with the interior of the
cylinder. These tubes which are of different lengths, are, by preference, of oblong
or square section although they may be round or semicircular.
The tubes, are preferably, arranged in groups of threes around the can each
group consisting of a short, an intermediate and a long tube, the short tube of one
group being beside the long one of the next.
Besides the tubes aforesaid holes or openings may be made in the cylinder.
The tubes are preferably surrounded by a metal casing which may be of any
suitable shape.
The cylindrical body is preferably provided with a cap or bonnet.
1004
.
Improvements in Ventilators and Chimney Cans.
I, ALEXANDER MARSHALL of 22 Jamieson Street, Govanhill, Glasgow,
Architect, 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 :-
This invention relates to ventilators and chimney cans and it has for its object to
improve the updraught and to lessen or entirely prevent downdraughts.
And in order that my said invention may be properly understood I have here-
unto appended two explanatory sheets of drawings, whereon,
Fig. 1 is a front elevation of the chimney can.
Fig. 2 is a front elevation of a slightly modified form of can.
Fig. 3 is a vertical section of the can Fig. 1 taken on the line x-x Fig. 5.
Fig. 4 is a horizontal section of the can Fig. 2 taken on the line 2-2.
Fig. 5 is a horizontal section of the can Fig. 1 taken on the line 2¹-2¹.
Fig. 6 shows, in horizontal section, a slight modification.
Fig. 7 is a front elevation of a ventilator.
Fig. 8 is a horizontal section of the same on the line 2-2 Fig. 7.
Fig. 9 is a front elevation of another design of ventilator.
Fig. 10 is a horizontal section of the same on the line 23-3 Fig. 9.

page_text: Fig. 11 is a part vertical section of a ventilator.
Fig. 12 shows, in horizontal section, a slight modification of the ventilators.
In carrying out my invention I make the can or ventilator with a, preferably,
cylindrical body a and I solder, or otherwise secure, right round the outer
circumference of this body a number of short tubes, or pipes, b, which are open at
their lower ends, and, at their upper ends, communicate with the interior of the
body as shown at Fig. 3. These tubes ó which spring from the same level are
of different lengths and are made, by preference of oblong, or square section, as
shown at Figs. 1 and 5, although they may be circular as shown at 6 in Figs. 2
and 4, or nearly circular as shown at 2 in Fig. 6.
These tubes (of which there may be twelve) as will be seen in Figs. 1, 3 and 5
are arranged in groups of threes round the body, each group consisting of a short
tube 1, au intermediate sized tube 2 and a long tube 3. The arrangement is such
that cach pair of tubes of equal size, as shown at Fig. 5, are diametrically opposite
each other, that is to say, each tube 1 is opposite a tube 1, each tube 2 opposite a
tube 2 and each tube 3 opposite a tube 3.
Besides the aforesaid tubes 6 there are four openings c in each can, made at
positions diametrically opposite each other as indicated in dotted lines at Fig. 5.
The tubes are preferably surrounded by a metal casing such as that shown
at d Fig. 2.
e is an ornamental cap or bonnet for the can.
In the case of the ventilators Figs. 7 to 12 the construction is the same as the
chimney cans, except that a louvre or other suitable form of ventilating top g is
fitted on top of my tubular arrangement. b.
With this improved construction of ventilator and chimney can upwardly moving
currents of air pass through the tubes band enter the body a at different elevations,
as indicated by the arrows Fig. 3, thereby causing a powerful updraught and at
the same time preventing or reducing downdraughts. Currents of air also enter
through the auxiliary openings c. As the tubes b of the same length are arranged
diametrically opposite each other it follows, that, at each elevation, four distinct
air currents impinge against each other in the centre of the body a thereby
effectively increasing the updraught and minimising downdraughts.
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
consider novel and desire to claim is :-
A ventilator or chimney can having a number of air tubes b, of different lengths,
arranged round its outer circumference, said tubes, which all spring from the same
level and are open to the atmosphere at their lower ends and to the interior of the
can at their upper ends, being so arranged as to deliver updraughts or currents at
different heights into the interior of the can, substantially as herein before described
with reference to the drawings annexed.
Dated this 22nd day of March 1895.
H. D. FITZPATRICK,
70, Wellington Street, Glasgow, Agent.