Year: 1886

page_text: Date of Application, 11th Dec., 1886.
Complete Left, 12th Sept., 1887.
Complete Accepted, 14th Oct., 1887
We, WILLIAM MATTHEWS and JOSEPH YATES, both of 35 Lever Street, Manchester,
in the County of Lancaster, Ventilating and Sanitary Engineers do hereby declare
the nature of this invention to be as follows :-
When ventilating fans are at rest, there is no provision in the ordinary types of
construction to prevent ingress of air through the fan into the space ventilated by it
when in operation, and so far as we are aware there are no existing means whereby
such an ingress of air can be automatically prevented.
This Invention is intended to supply the deficiency hereinbefore alluded to, and to
this end these Improvements consist in the arrangement and construction of an
automatic device which operates to close the aperture of the fan, or of a tube or tubes
or their equivalent enclosing such aperture, when the fan is at rest, but which causes
the aperture to become fully open when the fan is at work.
A pair of light doors or a single door or flap, preferably constructed of metal and
mounted or pivotted vertically or at an angle to a vertical plane may be arranged in
front of or behind the fan or if the fan is in a horizontal position, above or below the
fan, but so that when the doors or flap is or are closed no air can pass through the
fan. The flap or doors is or are balanced pivoted or otherwise arranged so as to close
by gravity weights or springs when the fan is at rest, or in other words when no
current of air is being originated by the fan.
By this arrangement the flap or doors close when the fan is at rest, while a very
slight current of air originated by the motion of the fan causes it or them to open
fully and permit a free passage. When the closing device is shut, the blowing of the
wind against it tends only to close it more firmly.
1000
WILLIAM E. HEYS,
70, Market Street, Manchester,
Agent for Applicants.

page_text: Improvements in and Connected with ventilating Fans,
We, WILLIAM MATTHEWS and JOSEPH YATES, both of 35, Lever Street, Manchester,
in the County of Lancaster, Ventilating and Sanitary Engineers 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:―
When ventilating fans are at rest, there is usually no provision in or connected
with those of the ordinary types of construction to prevent ingress of air through the
fan while it is at rest, into the space to be ventilated by it when in operation, and so
far as we are aware there are no existing means whereby such an ingress of air while
the fan is at rest can be automatically prevented.
This Invention is intended to supply the deficiency hereinbefore alluded to and for
this purpose these inprovements consist in the construction and arrangement of an
automatic device which operates to close the aperture of the fan, or of a tube or tubes
or its or their equivalent, surrounding or enclosing such aperture, when the fan is at
rest;
but which causes the aperture to become fully open when the fan is at work.
Three sheets of drawings are appended hereto and reference is hereinafter made to
the figures thereon.
In all the figures where the same or similar parts are represented, they are
indicated by similar letters.
A is the fan or air propeller; B is a tube or casing enclosing the fan or propeller
aperture; CC are the doors or flaps; E is a stop; F, F are the pivots or hinges upon
which the doors or flaps turn.
A pair of light doors C C Figs. 1 to 9, or a single door or flap C Figs. 10 and 12,
preferably constructed of light sheet metal are hinged or pivotted vertically, or at an
angle to a vertical plane, within a tube or passage in front of or behind the fan; or, if
the fan is in a horizontal position, above or below the fan, but so that when the doors
or flaps are closed no air can pass freely through the fan. The flap or doors is or
are balanced pivotted or otherwise arranged so as to close by gravity weights or springs
when the fan is at rest, or when no air is passing.
We have shown in the accompanying drawings, for the purpose of illustrating in
what manner our Invention may be carried into practical effect, a few modified
arrangements but it is evident that these might be greatly increased, and we desire
therefore that it shall be understood that we do not limit ourselves to the examples
shown. We have shown no arrangements in which springs or weights are used
because they are needed only in exceptional cases, as for instance in a horizontal
position, and the method of their adaptation is sufficiently evident to need no
description.
Figs. 1, 2 and 3 represent in front elevation and in horizontal and vertical section
respectively, one arrangement of our improvements. The doors are pivotted with
their upper parts slightly nearer to the rear of the tube, the doors consequently
incline slightly backwards and when no force is employed to keep them open, fall into

page_text: the closed position, but as soon as the fan is started the current of air then set up
acts upon the doors, and forces them into the open position as indicated by dotted
lines in Fig. 2.
In Fig. 4 the doors are pivotted so as to partly rotate upon their pivots, the open
position being indicated in dotted lines, and the closed position in full lines. Figs. 5,
6, 7 and 8 represent an arrangement similar to that shown in Figs. 1, 2 and 3 but
showing the fan or propeller also. Fig. 11 shows a similar arrangement with square
doors. Instead of mounting the double doors with an inclination backwards to secure
their closing, the same result may be obtained by arranging the hinges or pivots out
of the perpendicular.
Thus, referring to Fig. 1, the bottom ends of the pivots would be as represented,
but the top ends would be mounted at a greater distance apart.
By these arrangements the flaps or doors close automatically when the fan is at rest,
while a very slight current of air originated by the motion of the fan causes them to
open fully and permit a free passage.
When the closing device is shut, the blowing of the wind against it tends only to
close it more firmly.
Having now particularly described and ascertained the nature of our said Invention,
and in what manner the same may be performed, we declare that what we claim is:
(1) In combination with an air propeller or ventilating fan; a tube enclosing the
fan inlet or outlet and a flap, door or doors for automatically closing the tube when
the fan is at rest; substantially as herein before set forth and as illlustrated by the
accompanying drawings.
(2) In connection with an air propeller or ventilating fan; a flap or a door or
doors mounted pivotted or hinged so as to automatically close the aperture of the fan,
when the fan is at rest; substantially as and for the purpose hereinbefore described
and as illustrated by the accompanying drawings.
WILLIAM E. HEYS,
Agent for Applicants.