Year: 1886

page_text: Date of Application, 9th Sept., 1886.
Complete Left, 9th June, 1887.
Complete Accepted, 15th July, 1887.
We, STEFAN FARBAKY, and Dr. STEFAN SCHENEK, both Professors at the Mining
Academy at Schemnitz, Hungary, do hereby declare the nature of this Invention to
be as follows:-
The object of this Invention is to so construct or manufacture the positive pole-
plates of Secondary Batteries or Accumulators that the active material thereof does not
expand so as to break the frames. The said material according to this Invention does
not fill up the lead frame but is divided by gaps or holes which may be conveniently
arranged so as to form regular divisions in the grating.
By means of this improvement the durability of the positive electrode and con-
sequently that of the accumulator is greatly increased.
We have ascertained that the cause of the gradual destruction of the lead frames
of positive electrodes is that the active material increases in volume to a considerable
extent although slowly and by continually expanding and stretching the frame produces
cracks or flaws in the latter.
When the protecting crust of crystalline oxide of lead is torn away from the lead
the sulphuric acid and the electrolytically generated ozone obtain free access to these
cracks and this occurs after a time at numerous places so that the continuity of the
lead frame is ultimately broken and its conductivity destroyed, the positive electrode
finally falling to pieces.
This is prevented according to this Invention by employing in place of gratings
formed by straight bars crossing one another a frame formed by intersecting rings or

page_text: circles and placing the active material in the polygonal divisions or spaces formed by
the circles of the 4th 5th 6th etc :-of such rings, only, the hollows formed by single
pairs of rings being left empty.
In this and analogous forms of construction the augmentation in volume of the
active material is almost entirely confined to the independent divisions and the sides of
the polygon are not stretched but rather compressed so that the frame as a whole
undergoes practically no alteration in its form and is thereby protected to a consider-
able extent from deterioration.
J. HENRY JOHNSON,
47, Lincoln's Inn Fields, London, W.C.,
Agent for the said Stephen Farbaky
and Dr. Stephen Shenek.

page_text: We STEFAN FARBAKY, and Dr. STEFAN SCHENEK both of Schemnitz Hungary
Professors at the Mining Academy there, do hereby declare the nature of this inven-
tion and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
The object of this Invention is to so construct or manufacture the plates or elements
of secondary batteries or accumulators that the active material thereof does not expand
so as to break the frames. The said material according to this Invention does not fill
up the lead frame but is divided by gaps or holes which may be conveniently arranged
so as to form regular divisions in the grating. By means of this improvement the
durability of the plates or elements and consequently that of the accumulator is
greatly increased.
We have ascertained that the cause of the gradual destruction of the lead frames
of the said plates or elements is that the active material increases in volume to a
considerable extent although slowly and by continually expanding and stretching the
frame produces cracks or flaws in the latter. When the protecting crust of crystalline
oxide of lead breaks away from the lead the sulphuric acid or electrolyte and the
electrolytically generated ozone obtain free access to these cracks and this occurs after
a time at numerous places so that the continuity of the lead frame is ultimately
broken and its conductivity destroyed the plate or element finally falling to pieces.
This is prevented according to this Invention by employing in place of gratings
formed by straight bars crossing one another a frame formed by intersecting rings or
divisions forming polygonal spaces for the reception of the active material with gaps
or spaces between, which are unoccupied. Figure 1 of the annexed drawings is a side
elevation and Figure 2 is a transverse section of a plate or element constructed
according to our Invention in which it will be seen that the rings c forming the
grating are so arranged that polygonal spaces at a are formed for the reception of
active material the spaces at 6 being left empty.
b
In this form of construction the augmentation in volume of the active material
takes place without injury to the plate or element as the unoccupied spaces 6 permit of
the expansion of the contents of each space and the divisions are not stretched but
rather compressed so that the frame as a whole undergoes practically no alteration in
its form and is thereby protected to a considerable extent from deterioration. It will

page_text: be evident that the divisions may be of other shape than circular provided that there
are formed thereby the spaces for the active material with unoccupied spaces between
as herein before described.
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 construction of plates or elements for secondary batteries or electric accumulators
with divisions or spaces a containing the active material and having between them the
unoccupied holes or spaces b substantially as and for the purpose hereinbefore described
and illustrated by the accompanying drawing.