IMPROVEMENTS IN ARNOTT AND OTHER VENTILATORS
Year: 1878

page_text: LETTERS PATENT to Joseph Corbett, of Barton Arcade, in the City of Man-
chester, Sanitary Engineer, for the Invention of "IMPROVEMENTS IN ARNOTT
AND OTHER VENTILATORS."
"
Sealed the 30th August 1878, and dated the 2nd March 1878
PROVISIONAL SPECIFICATION left by the said Joseph Corbett at the Office
of the Commissioners of Patents on the 2nd March 1878.
JOSEPH CORBETT, of Barton Arcade, in the City of Manchester, Sanitary
Engineer. "IMPROVEMENTS IN ARNOTT AND OTHER VENTILATORS.”
These improvements relate to a novel method of constructing and mounting the
flap or valve in Arnott's and other similar ventilators, so that the same shall be per-
fectly noiseless and more sensitive in action than heretofore.
I prefer to construct the flap or valve of thin metal plate with turned-up edges
all round, over which I stretch textile or other suitable fabric, which thus consti-
tutes a noiseless surface for the face of the flap or valve; and instead of mounting
the flap or valve upon horizontal pins or knife edges, as hitherto, I arrange the
same to open sideways and to turn upon a vertical pivot at the bottom and a knife
edge at the top, whereby much greater sensitiveness is obtained.
By means of a cranked spindle actuating a lever arm, I afford facilities for per-
manently closing the flap or valve.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Joseph Corbett in the Great Seal Patent Office on the 2nd September
1878.
JOSEPH CORBETT, of Barton Arcade, in the City of Manchester, Sanitary
Engineer. 'IMPROVEMENTS IN ARNOTT AND OTHER VENTILATORS."
"
These improvements relate to a novel method of constructing and mounting the
flap or valve in Arnott's and other similar ventilators, so that the same shall be per-
fectly noiseless and more sensitive in action than heretofore.
I prefer to construct, the flap or valve of thin metal plate with turned-up edges
all round, over which I stretch textile or other suitable fabric, and which thus
constitutes a noiseless surface for the face of the flap or valve, and instead of
mounting the flap or valve upon horizontal pins or knife edges, as hitherto, I
arrange the same to open sideways and to turn upon a vertical pivot at the
bottom and a knife edge at the top, whereby much greater sensitiveness is
obtained.
By means of a cranked spindle actuating a lever arm or tumbler, I afford facilities
for permanently closing the flap or valve.
And in order that this my said Invention may be the more readily understood
and carried into practical effect, I have hereunto annexed a Drawing illustrative of
my improvements in Arnott and other ventilators.
Similar letters marked upon the several views being used to denote similar
parts.
Fig. 1 is a partial front exterior view; Fig. 2, a back view; Fig. 3, a side
sectional view; and Fig. 4, a sectional plan of a ventilator, constructed in accordance
with my Invention.
In all the views A is the box or wall casing, by preference constructed of cast
iron, and which is designed to be built into the flue wall in a vertical position. To
the front edge of this box is secured the face plate B by means of the screws C,
assisted by the corner studs D, or any other convenient and detachable method of
fastening the two parts together might be substituted. E is my improved flap or
valve, constructed of thin metal plate with turned-up edges F all round, as illus-
trated, and with a covering of textile or other suitable fabric G stretched over such
turned-up edges F, in order to constitute a close-fitting and noiseless surface to close
against the turned-in edges H of the face plate B.
This flap or valve E, in accordance with this Invention, opens sideways, after the
manner of a door, being mounted vertically, or nearly so, instead of horizontally, as
heretofore. It is preferred to hang this flap or valve at the bottom upon the steel
pin or pivot I, and at the top upon a knife-edge bearing J (see separate view over
Fig. 4); and in order to give such flap or valve a constant tendency to close, I
arrange that the knife edge J shall be a little in advance, say, nearer to the face of
the valve than the point of the pin or pivot I, and thus I am enabled to produce an
exceedingly sensitive and noiseless action. I do not, however, confine myself
to this particular method of mounting, provided that the vertical position is
retained.
K is a regulator for permanently closing the flap or valve, for which purpose such
regulator is secured to a spindle L, passing through a socket M, and having a
tumbler N hinged to its back extremity, as illustrated. This tumbler N is provided
with a pad O to silence the flap or valve when opening against it, and with an
arm P, which is designed to cant such tumbler backwards or forwards by
contact with one or the other of two lugs Q, projecting at the back of the
spindle socket M.
The action of this regulator and tumbler is as follows:-When the regulator K
is in the position indicated in Fig. 1, the tumbler N is thrown back, as seen in all
the views, and the flap or valve E is free to open, but if it is required to keep the

page_text: flap or valve in the closed position, the regulator K is turned to the position indi-
cated by the dotted lines in Fig. 1, and in so turning, the arm P has come in contact
with the lug Q, and thus caused the tumbler N to cant over to the position indicated
by dotted lines in Figs. 2, 3, and 4, when such tumbler by lying in contact with
the back of the flap or valve E will effectually keep the same in the closed
position.
Having thus particularly described and ascertained the nature of this my said
Invention, together with the best methods with which I am acquainted for carrying
the same into practical effect, I wish it to be distinctly understood that I do not
confine myself to the precise details, relative proportions, or dimensions of the
various parts of the ventilator, herein-before described, and illustrated on the
accompanying Drawing, as the same may be considerably varied without departing
from the Invention, but that I claim,―
1st. Mounting the flap or valve in Arnott or other ventilators vertically, or nearly
so, as and for the purposes herein-before described, and illustrated on the accom-
panying Drawing.
2nd. Covering the face of the flap or valve of ventilators with textile or other
suitable fabric whereby a noiseless action is obtained, as herein-before described,
and illustrated on the accompanying Drawing.
3rd. The tumbler action for closing the flap or valve in ventilators, substantially
as herein-before described, and illustrated on the accompanying Drawing.
In witness whereof, I, the said Joseph Corbett, have hereunto set my hand
and seal, this 31st day of August, in the year of our Lord One thousand
eight hundred and seventy-eight.
JOSEPH CORBETT. (L.S.)