Improvements in Ventilators.
Year: 1892

page_text: Date of Application, 28th Sept.. 1892-Accepted, 29th Oct., 1892
COMPLETE SPECIFICATION.
Improvements in Ventilators.
We, JOSHUA VALENTINE EVES, Mill Manager, and MALCOM MACGREGOR
GREEVES, Manager, both of The Forth River Mills, Falls Road, Belfast, in
the County of Antrim, Ireland, 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 that class of ventilator for ventilating rooms and other
buildings which are inserted in the chimney breast and similar situations for
extracting and carrying off the vitiated air of the room into the flue.
In these ventilators as at present constructed there is always the liability of a
return draught carrying smoke from the chimney into the room and it is to obviate
and prevent this that the present invention is designed.
It consists essentially in constructing the ventilator with a double set of valves
or flaps so that should any return draught raise and pass the first flap it will be
deflected in a direction straight against the second flap and so prevent any
possibility of passing therethrough into the room.
It will be fully described with reference to the accompanying drawings.
Fig. 1. sectional elevation.
Fig. 2. front elevation.
The wall box or frame A is constructed or cast of any convenient or desired size,
and is divided into one two or more compartments a according to its size. In front
of each compartment is placed a slotted plate or grid B and to the inner surface of
the slotted plate B are attached flap valves C of oil silk mica or other light
material. These are preferably fastened by plates or strips & screwed against the
upper edge.
At the inner side of the compartments a we place a second slotted plate or
grid D secured thereto by the screws d this plate we also fit with flap valves E of
oil silk mica or other material. By the use of this second set of valves placed
behind the other all liability of a return draught passing out through the front
plate B is prevented. A return draught may by striking the bottom flange at be
deflected up under the silk flap E but the deflected current entering under the
flap E is directed straight against the flap C and keeps it shut.
The ventilator in front is provided with sliding slotted plates F which can be
moved to and fro over the plates B to open or close the ventilator.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. An extractor ventilator for chimney breasts and similar situations constructed
with a second set of flap valves placed at some distance behind the front set to
direct any return current which may be deflected up under them direct against the
front flap valves to keep them shut substantially as described.
2. A ventilator for rooms and buildings having the several parts constructed and
arranged substantially as and for the purposes described and shown.
Dated this 22nd day of September 1892.
WM. P. THOMPSON & Co.,
6, Bank Street, Manchester, Patent Agents.