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Патент USA US2136568

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' Nov. 15, 1938.
Filed April 1'7. 1936
Patented Nov. 15, 1938
George K. Szilrlai, New York, rN>.'-Y., .assignor :to
V Electro-Mechanical Research, ‘Inc, ‘Brooklyn,
N. Y., a corporation of New York
Application April 17, 1936, ‘Serial ‘No; 74,892
3 Claims. (Cl. 220-44)
This invention relates to electrolytic devices portion 4 preferably, although not necessarily,
and more particularly to electrolytic cells, con
densers, lighting arresters and the like.
In most types of electrolytic devices especially
in the sealed-container type of device, it is the
usual practice to provide some kind of vent for
the escape of gas generated within the device.
However these vents must be of such a nature
that normally they are hermetically closed to
10 prevent the escape of the liquid electrolyte and
to prevent the contamination of the electrolyte
by gases or liquids outside the device.
Accordingly it is one of the principal objects’
of the present invention to provide an improved
” vent for electrolytic devices generally.
Another object is to‘ provide a vent for elec
trolytic devices, which vent is simple in struc
ture, economical to manufacture and to assemble,
and which reduces the possibility of contamina
20 tion of the electrolyte to a minimum.
A feature of the invention relates to an im
proved venting arrangement for an electrolytic
device, whereby the danger of damage to per
sons or objects resulting from the escape of gases
25 or liquid from the device is materially reduced.
Another feature relates to the novel organiza
tion, arrangement and relative location of parts
which go to make up a cheap, and efficient valv
ing event for electrolytic devices.
While the invention will be described herein
as embodied in one form of electrolytic device,
namely an electric condenser of the liquid elec
trolyte type, it will be understood that this is
done merely for purposes of explanation and not
35 by Way of limitation.
Referring to the drawing there is shown a
condenser comprising a metal container I which
may, if desired, be of such a metal that it can
constitute one of the condenser electrodes, al
40 though it will be understood that the invention
is not limited in that respect. Insulatingly sealed
into the bottom of the container is a suitable co
operating electrode 2 of a metal such as is usual
ly employed in electrolytic condensers.
If de
45 sired the container l and the electrode 2 may
.be of the same material such as aluminum or
other ?lm-forming metal and if desired an aux
, iliary electrode or cathanode (not shown) may
be employed as described in application, Serial
50 No. 72,878, ?led April 6, 1936.
The top of the container l is provided with a
cover 3 preferably of the same'material as the
container and hermetically sealed thereto in any
well-known manner. The central portion of the
65 cover is provided with a re-entrant or recessed
circular in contour. Prior to sealing the cover
to the container, a relatively thin flat rubber band
5 is tightly ?tted over the re-entrant cylindrical
Wall of the recess 4. As will be seen, this cylin U!
drical wall has, been previously provided with a
series of circumferentially spaced perforations 6,
only one of which is shown in the drawing. After
the condenser has been completely assembled,
the rubber band is punctured by passing a very
?ne needle through one or more of the perfora
tions 6 so that the normal resiliency of the rub—
her band continues to effectively seal the perfora“
tion. However should gases be generated with
in the container at any time, the increase in pres
sure within the container above atmospheric‘
pressure, causes the very ?ne perforation in the
rubber band to automatically open thus provid
ing a vent for the escape of these gases.
The provision of the recessed portion 4 and
the arrangement of the valved vent openings on
the cylindrical wall of this portion 4 has the ad
vantage that should the escaping gases carry
with them some of the liquid electrolyte, the elec
trolyte issues in a ?ne stream and impinges upon 25
the opposite side of the wall of the recess instead
of being projected directly away from the con
denser. The recessed portion of the top cover
therefore provides a receptacle for the escaping
liquid and when the condenser is mounted in a "
vertical position as shown in the drawing, this
escaped electrolyte remains in the recess and is
thus prevented from ?owing onto adjacent ob
The valved vent in addition to possessing the 35
advantages enumerated, also reduces the possi
bility of contamination of the electrolyte because
the rubber band can be of relatively small sur
face extent and is the only foreign substance
within the cell apart from the necessary parts
thereof, namely the electrodes and the electro
While one speci?c embodiment of the inven
tion has been illustrated and described, it will be
understood that various changes and modi?ca
tions may be made therein without departing
from the spirit and scope of the invention.
What I claim is:
1. In an electrolytic device, a container for an
electrolyte, a cover for said container, said cover .
having a re-entrant portion and a raised rim,
a perforation in the wall of said re-entrant por
tion, and a resilient band closely surrounding
said reentrant portion on the interior of said
container and normally closing off said perfora
tion, but allowing the escape of gases from said
container through said perforation when the
pressure within the container rises above atmos
pheric pressure, said perforation being disposed
below the upper edge of said rim and facing said
the pressure within the container is above at
mospheric pressure, said perforation being dis
posed below the upper edge of said rim and fac
ing below the said rim.
3. In an electrolytic device, a container for an 5
electrolyte, a cover with a raised rim hermetically
2. In an electrolytic device, a container for an
electrolyte, a cover hermetically united to said
recess in said cover the cylindrical wall of said
container, said cover having a raised rim and a
cylindrical recessed portion the cylindrical wall
of said recessed portion being provided with at
least one perforation, a rubber band tightly ?t
ting around said cylindrical wall on the interior
of said container and normally hermetically seal
ing said perforation, said rubber band having a
?ne opening which normally is maintained closed
due to the resiliency of the rubber but opens to
allow gases to escape from the container when
united to said container, a cylindrical re-entrant
recess having a series of spaced perforations, a
flat rubber band tightly ?tted over said cylin- 11'?
drical wall on the interior of the container, said
rubber band having a series of ?ne normally
closed openings in alignment with the said per
forations, said perforations being disposed be
low the upper edge of said rim and facing said
rim for the purpose described.
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