IMPROVEMENTS IN VENTILATORS
Year: 1878

page_text: LETTERS PATENT to Comyn Ching, of Castle Street, Long Acre, in the County
of Middlesex, for the Invention of "IMPROVEMENTS IN VENTILATORS."
1
5011
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PROVISIONAL SPECIFICATION left by the said Comyn Ching at the Office
of the Commissioners of Patents on the 9th July 1878.
COMYN CHING, of Castle Street, Long Acre, in the County of Middlesex.
"IMPROVEMENTS IN VENTILATORS."
My Invention relates to improvements in the ventilating apparatus for which.
Letters Patent were granted to Thomas Boyle, dated 14th July 1864, No. 1757,
and has for its object to obviate the noise occasioned by the flapping of the valve
against its seat when in action, without at the same time destroying the sensitiveness
of the apparatus.
To this end my Invention consists in the employment of thin plates of mica
forming the valves, coated with a film of paint, and in the substitution for the
inclined metallic plate which forms the back of the valve tray in the said
previous Patent, of a plate having on its rear side a surface of felt or equivalent
material, the object being to deaden the sonorous quality of the mica and render
the apparatus practically noiseless in its action.
According to my Invention the whole of the valve tray or the inclined back of
the tray only, preferably consists of a sheet or sheets of papier maché provided with
apertures, over which the valves are lightly suspended, fitting into the box or
case, and secured in position against a flange on the latter. The back of the
inclined plate against which the valves come in contact is covered with felt as before
mentioned, but any other material or combination of materials giving the same
result may be employed in place of the felt, if found desirable.
The Invention further relates to an improvement in suspending the valves over
the openings in the tray, and consists in the employment of curved arms hinged at
back of the tray, and carrying the valves, which, for the purpose of my Invention,
are preferably of a circular form, and are loosely mounted on a horizontal pivot in.
the said arms so that they may revolve thereon, the object of this arrangement
being to ensure an even and noiseless fall of the valves.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Comyn Ching in the Great Seal Patent Office on the 9th January
1879.
_COMYN CHING, of Castle Street, Long Acre, in the County of Middlesex.
"IMPROVEMENTS IN VENTILATORS."
My Invention relates to improvements in the ventilators for which Letters
Patent were granted to Thomas Boyle, dated 14th July 1864, No. 1757, and has
for its object to lessen the noise occasioned by the flapping of the valve against
its seat when in action without impairing the sensitiveness of the apparatus.
To this end my Invention consists first in coating the thin plates of mica forming
the valves with a film of paint, and in the substitution for the inclined metallic
plate which forms the valve seat or the back of the valve tray in the said previous
Patent, of a non-metallic plate having on its rear side a surface of felt or equivalent
material, the object being to deaden the sonorous quality of the mica and render the
apparatus practically noiseless in its action.
According to this part of my Invention the whole of the valve tray or the
inclined back of the tray or valve seat only, preferably consists of a plate of
Rapier maché or millboard provided with apertures, over which the valves are
lightly suspended, and the back of the inclined plate against which-the valve comes
in contact is covered with felt as before mentioned; but any other fibrous material
or combination of fibrous materials may be employed in place of the felt, if found
desirable.
The Invention further relates to an improvement in suspending the valves over
the openings in the tray by means of arms hinged at the back of the tray, and
carrying the valves, which, as well as the apertures over which they close, are for
the purpose of my Invention of circular form, and the valves are loosely mounted
on central pins in the said arms, so that they may revolve thereon, the object of
this arrangement being to enable the valves to rotate on their pivots, and adapt
themselves to the seat or surface against which they close, so as to ensure an even
and noiseless fall of the valves,
Figure 1 is a front; Figure 2, a rear; and Figure 3, a sectional view of a
ventilator of the kind above described, constructed according to my Invention.
Figures 4, 5, 6, 7, show details.
. Referring to. Figures 1, 2, 3, A is the cast-iron casing or frame of the ventilator
provided with a grating at front as usual. In these Figures the frame is shown as
made in two parts screwed together, the rear or box part which fits into the wall
being formed with a flange a to support the plate B in position as usual.
According to my Invention this plate B, instead of being of iron or other metal as
hitherto, is made of papier maché, and the valves, instead of being of rectangular,
are of circular form C, each valve closing over a rather smaller aperture 6 of
corresponding form in the plate B. The rear surface of this plate B, against which
its valves C close, is covered with felt or other fibrous material which is blown on to
the surface after it has been covered with an adhesive cement in the ordinary way.
of covering forms or foundations with felt; or instead of loose fibres a woven or
. other fabric may be cemented to the papier maché. Each valve C is hung on a
central pin c, on which it is free to turn, said pin being rivetted to a light wire
arm D, hinged or pivoted in staples d, fixed to the plate B. The form of these
arms D may vary, as shown in the various examples.
. In No. 1, Figures 2 and 4, the arm is doubled and curved, and has eyes a, at the
extremities of which it pivots on a pin e passing. through staples d, and secured
therein by washers a³, rivetted or soldered to the pin e.
"

page_text: In No. 2, Figures 2 and 5, the pin e is dispensed with, the arms are double, and
lie flat against the valve, and their ends are turned outwards at right angles to the
arms to form pivots to work in the staples d, as shown.
In No. 3, Figures 2 and 6, the arm D is single, and the pin c is rivetted to it at
one end, and the other end is soldered or otherwise fixed to a cross pin e, which in
this case forms part of the arm and turns in the staples d, in which it is retained
by washers as before. The arm D is in this case curved outwards, as shown in the
detail view, Figure 6, so as only to touch the disc or valve C at the centre.
In No. 4, Figures 2 and 7, the arm is similar to No. 3, except that it is bent at
an angle, as shown in the detail, Figure 7, instead of being curved.
In No. 5, Figure 2, the arm D is the same as in Figure 4, except that the pivot
pin e, instead of being secured in the staples d by washers, is retained by having its
ends bent down at right angles as shewn; in all cases the discs or valves C are of
mica, coated on the back with a film of oil paint.
Having described the nature of my Invention, and the manner of performing the
same, I declare that what I claim as my Invention to be protected by the herein-
before in part recited Letters Patent is,-
1st. The employment in a Boyle's ventilator of discs or valves coated with a
film of paint for the purpose specified..
2nd. Making the valve seat of a Boyle's ventilator of papier maché or
millboard, coated with felt or other fibrous material, as and for the purpose
specified.
3rd. The employment in a Boyle's ventilator of circular valves, each mounted
on a central pivot, and carried by an arm working on a hinge or pivot, substantially
as and for the purpose specified.
In witness whereof, I, the said Comyn Ching, have hereunto set my
hand and seal, this Eighth day of January, in the year of our Lord One
thousand eight hundred and seventy-nine.
TANרזHTT