An Improved Device for Preventing Down Draught in Ventilating Tubes and Flues.
Year: 1889

page_text: Date of Application, 1st Feb., 1889
Complete Specification Left, 3rd July, 1889-Accepted, 3rd Aug.. 1889
PROVISIONAL SPECIFICATION.
An Improved Device for Preventing Down Draught in Ventilating
Tubes and Flues.
I, CHARLES WILLIAM RICHARDSON, Architect, of Wakefield, in the county of York
do hereby declare the nature of this invention to be as follows:
:-
My invention consists in placing a diaphragm at a rising oblique angle, within the
vertical tube or flue under the head or terminal of all ventilators acting on the exhaust
or foul air extractor principle, such diaphragm to completely pass across the whole
internal area of the said tube, either in one straight unbroken sheet, or doubled back
from the centre in the shape of an inverted V, thus ^, or in any other form, to be
perforated over the whole surface or formed of metal or other rigid netting, and the
whole of the upper surface of the same to be covered with shallow flaps made of
silk or other light material, fixed to the diaphragmn by the upper edge only, and
placed immediately above each other so that the loose side of one flap slightly over-
laps the fixed edge of the next below it, and so completely close all the perforations
of the diaphragm when any down current of air presses upon them from above but
which rise from the diaphragm to permit any up current to pass unimpeded through
the diaphragm and tube.
Dated this 30th day of Jannarv 1889.
C. W. RICHARDSON.
COMPLETE SPECIFICATION.
An Improved Device for Preventing Down Draught in Ventilating
Tubes and Flues.
I, CHARLES WILLIAM RICHARDSON, Architect, of Wakefield, in the county of York,
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 has reference to all ventilators acting' on the exhaust or foul air
extractor principle, and consists in placing a diaphragm at a rising oblique angle or
other suitable position within the vertical tube, under the head or terminal of such
ventilators.
The said diaphragm completely passes across the whole internal area of such tube,
either in one straight unbroken sheet, or doubled back from the centre following the
line of an inverted V, thus A, or in any other form. The said diaphragm being
formed or made of metal (perforated where necessary or over the whole surface) or
altogether or partially of rigid netting or any other material, and the whole of the
upper or side surfaces of the said diaphragm where perforated are covered with
shallow flaps or valves, made of silk, mica or other light material, fixed to the
diaphragm by the upper edge only, and in such a manner and of such a size as to
completely close all the perforations of the diaphragm when any down current of
air presses against them from above, but which rise from the diaphragm to permit
any up current to pass unimpeded through the perforated portions of the diaphragm
and tube aforesaid.

page_text: Fig. 3, is a plan of Fig. 2.
Fig. 4, shows a further modification of my improved device.
Fig. 5, is a plan of Fig. 4.
My invention consists in placing a diaphragm A at a rising oblique angle within
the vertical tuberB, under the head or terminal of.. all ventilators acting on the
exhaust or foul air extractor. principle. The said diaphragm passes completely across
the whole internal area of the tube B, either in one straight, unbroken sheet, or
doubled back from the centre, following the line of an inverted V, thus A, or in any
other form. The said diaphragm being formed or made of metal (perforated where
necessary, or over the whole surface,) or altogether or partially of rigid netting or any
other material, and the whole of the upper or side. surfaces of the said diaphragm A
where perforated are covered with shallow flaps or. valves C, made of silk, mica, or
...other light material, fixed. to the diaphragm. A by the upper edges only, and in such
a, manner, and of such a size as to completely close, all; the perforations of the
diaphragm when any down current. of, air presses against them from above, but
which rise from the diaphragm to permit any up current to pass unimpeded through
the perforated portions of the diaphragm and tube aforesaid.
Having now particularly described and ascertained the nature of my said inven-.
tion and in what mannor the same is to be performed I declare that .what I
claim is :-
•
In ventilators acting on the exhaust or foul air extractor principle, the employment
1, within vertical tubes of diaphragms, having,.valves, or flaps, substantially. as and for
'the purposes shown and described.
Dated this 24th day of June 1889.
JOHN E. WALSH,
Royal Exchange Chambers, Boar Lane, Leeds, Agent for the Applicant.