IMPROVEMENTS IN VENTILATORS
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
WALTER ELKIN, of back of 78 Coleshill Street, Birmingham in the county of
Warwick, and CHARLES JAMES ELKIN, of the same address, both Brassfounders do
hereby declare the nature of our invention for IMPROVEMENTS IN VENTILATORS
to be as follows:-
This invention consists of an arrangement of ventilator for the purpose of
admitting air into, or allowing the escape of air out of, rooms and other places,
being constructed in a simpler manner than heretofore, and may be described as
follows:-
I provide a frame or casing, generally made of cast iron, but may be made of
other suitable material generally of an oblong shape, and also in many instances
made about the size of a brick, although I do not limit myself as to precise shape
or size.
Hence in describing one made about the size of a brick I mean to say that
looking at it in front elevation, it would have an aperture about nine inches wide,
about three inches high and about four inches more or less through it, the metal
being about one quarter of an inch thick more or less.
At the front. I form a flange around it, from the aperture outwards, which forms
a sort of shoulder to the surrounding brickwork (when in position) and also provides
for the attachment of small necessary details.
Across the front of the aperture, to the height of about one half or thereabouts
of the said aperture I form a plate, so that it covers about one half, more or less of
the opening.
The said flange, and the said plate across the opening, may either be made in one
with the frame, or each may be made separate, or any two of them made together.
When made separate they would, where necessary, be connected by screws or other
suitable fastenings.
I further provide a flap or door which is made to swing upon centres or pivots
near the top of the said plate, that is at about one half of the height in the frame,
this flap or door being so made as to be balanced in its action in such a manner
that when in working position and opened, it shall have no tendency in itself to
close, and when closed, it shall have a tendency to keep closed. In some cases
I further fix at the rear part of the inside of frame, an inclined plate at at angle
to suit the flap or door when open, extending from about the then inside edge of
1

page_text: flap or door, towards the extreme edge of the frame, thus forming as it were a
continuous surface of a somewhat bellmouth shape for the better conducting of the
air through the opening.
Again. To the front of the flap or door I attach the two ends of a cord or cords,
with suitable brackets or projections, having grooved parts, or pulleys for the cords
to run upon.
The purpose of the cord or cords being to open and close the flap or door. This
cord or cords may either hang suspended, and weighted independent of each other,
or may have a weight suspended common to both.
By this arrangement I produce in a ventilator, having fewer parts and simpler in
construction the same results (as a ventilator,) as found in those of present manu-
facture which are more costly and complicated.

page_text: Fig 1, is a front elevation, Fig 2, is an end elevation, and Fig 4, a plan of the
ventilator when closed.
Fig 3, is a sectional elevation of the ventilator, shewing it as being open.
Fig 5, is a back view of the flap or door.
Fig 6, is an end view of the flap or door,
Fig 7, is a sectional elevation of the frame only, showing also the plate at front
of ventilator.
In all the figures, A, is the frame or casing, which is provided at B, with suitable
recesses, to receive the trunnion or swivel bearings, upon the flap or door G, as
shewn at C, Fig 5.
At the front of this frame or casing, a recess D is provided, to allow the flap G
to butt against when closed.
An inclined plate E is provided which may be either cast in one with the frame
or casing, or, made separate and attached thereto.
Plates F & F¹, are for the purpose of covering the trunnion or swivel bearings"
upon the flap or door G, and keeping the same in working position.
The flap or door G, Fig 1, 3, 5, & 6, is provided with trunnion bearings Ċ, which,
when in position oscillate in recesses B, Fig 1, 3, & 7:
Two pieces H, H³, are also provided upon the flap or door G, similarly as shewn
at Fig 3, 5 & 6.
An eye piece, or loop, or, in some cases simply a hole through the flap or door, is
provided at I & J, Fig 1, 2, 3, & 5, for the purpose of attaching the cords L & M,
which may be metallic or otherwise.
.
At K, Fig 1, 2, 3, & 4, is a pulley and bracket for the guiding of the cord L.
I may if necessary provide a similar pulley and bracket for cord M.
The cords L, & M may terminate individually with a weight N, or, they may be
connected and have a weight common to both simply hanging thereon.
At O, Fig 7. is a plate extending across the front of the aperture in frame or.
casing A, to the height of about one half more or less.
This plate O, may be cast in one with the frame A, or made separately and
attached thereto, or, in some cases dispensed with altogether.
The action of our ventilator will be readily seen from the drawings that, by pulling
downwards the cord M, the flap or door G, will open, as shewn in Fig 3, in order

page_text: that air may freely pass through, and further by pulling the cord L, the flap or
door G will be closed, the said flap or door being so balanced upon its trunnions C,
ELS, that when open or closed there is no tendency in itself to change its position.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
.we claim is
The general construction and arrangement of the various parts constituting. the
ventilator, as hereinbefore described and illustrated by the accompanying drawings.
Dated this 18th day of July 1885.
WALTER ELKIN.
CHARLES JAMES ELKIN.
Per Chas. T. Powell,
Agent for the Applicants.