Improvements in and connected with Frames for Electric Accumulators.
Year: 1896

page_text: Improvements in and connected with Frames for Electric
Accumulators.
I, HENRY LEITNER, of 39, Elsasser Strasse of Berlin, Kingdom of Prussia,
Germany, chemist do hereby declare the nature of this invention to be as follows:-
This invention relates to frames for carrying or holding the active material or
mass employed in electric accumulators, or more precisely, in the plates
of the same. My improved frame consists of lead, and is made in a size correspond-
ing to the size of the plate to be produced. Said leaden frame is furnished with
stays or traverses which divide the frame in a manner similar to a window or the
like, and the frame proper as well as said traverses or stays are provided with
perforations adapted to hold a wire-netting or wire-nettings also consisting of lead.
The said frames are intended for use with accumulators employing strongly
adhesive peroxyde of lead as the active material or mass. The raw mixture used
by me for the production of said mass has so great a contents of lead, or, more pre-
cisely, of oxide of lead, that on turning said mixture into peroxide of lead this
latter exerts a strong pressure upon the frame in consequence of its molecular
expansion, and, so to say, wedges itself firmly into said frame.
After having the spaces between the frame proper and the stays or traverses
filled out with the raw material mentioned, and before subjecting the latter to the
action of an electric current, the frame or plate is covered with a wire-netting or
wire-nettings arranged either upon one side only, or on both sides. Said netting
or nettings is or are secured to the frame or plate by aid of the perforations afore
mentioned. When the raw material is thus secured in place, it is turned into
peroxide of lead, and the plate is then ready for use.
In accumulator-plates constructed as afore described the advantages of plates
consisting mainly of an active mass are combined with the advantages of such that
consist mainly of a grate or lattice; my improved plates are, however, free from
the disadvantage of the kind of plates last mentioned, because they are not
destroyed by getting bent; furthermore, their weight is far from being as great
as that of the other kind of plates.

page_text: Improvements in and connected with Frames for Electric
Accumulators.
I, HENRY LEITNER of 207, Piccadilly, London, W., late of 39 Elsasser Strasse,
Berlin, Germany, Chemist, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
This invention relates to frames for providing an efficient contact for and pro-
tecting the active material employed in electric accumulators or more precisely
in the plates of the same.
My improved frame consists of lead and is made in a size corresponding to the
size of the plate to be produced. The said leaden frame is furnished with stays
or traverses which divide the frame in a manner similar to a window or the like,
and the frame proper as well as the said traverses or stays are provided with per-
forations through which rivets to hold a thin wire netting or wire nettings or sieve
also consisting of lead are meant to pass.
The said frames are intended for use with accumulators employing a very co-
herent peroxide of lead as the active material or mass. The raw mixture used by
me for the production of said mass consists of so dense an amount of lead or more
precisely of oxide of lead that on turning said mixture into peroxide of lead this
latter exerts a strong pressure upon the frame in consequence of its molecular
expansion and so to say wedges itself firmly into said frame.
The material which I so employ and the mode of forming it into electrodes is
particularly described in the specification lodged in connection with the Patent
granted to me and numbered 780 of 1896. When electrodes are formed of this
material and in the manner described in the said specification, it is not necessary
to provide extraneous support for the purpose of preserving the shape of the
electrode. I am able therefore to make the frame of very light construction and
to give to it such a form as will best secure electrical contact between the said
frame and the active material of the electrode without regard to considerations
affecting only the retaining of the active material in position within the electrode.
And in order that the construction of my frame and the mode of applying it to
the formed electrode may be perfectly understood, I will describe it with reference
to the accompanying drawings:-
Fig. 1 shows the frame in plan, Fig. 2 shows the same in end view.
A is a leaden frame made rectangular in form as shown in order that it may
fit conveniently into the electrolytic cell. a a are bars forming part of the said
frame and extending longitudinally parallel to one another. The said bars are
preferably arranged at distances of about three to six inches from one another, it
being found that the active material described in my said specification No. 780
of 1896 works best when divided up into masses of about that breadth. The said
bars and outer frame are formed of lead and of about the substance indicated in
the drawing, that is to say approximately square in section and having but small
thickness. A leaden frame even one twelfth of an inch thick, is sufficiently strong
when used with the said active material and it is desirable to reduce weight as much
as possible and therefore inasmuch as the leaden frame is the part of the electrode
of highest specific gravity, it is desirable to use for this purpose as little metal as
possible. The frame and bars are perforated as shown (some of the said perfora-
tions being denoted by the letter c) to facilitate the attachment thereto of wire
netting hereafter mentioned.
After having the spaces between the frame proper and the stays or traverses

page_text: filled out with the raw material mentioned and before subjecting the latter to the
action of an electric current, the frame or plate is covered with a lead wire netting,
sieve or wire nettings arranged either upon one side only or upon both sides.
Said netting or nettings is or are secured to the frame or plate by the aid of rivets
passing through the perforations above mentioned. When the raw material is
thus secured in place it is ultimately turned into peroxide of lead and the plate is
then ready for use.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed, I declare that what I
claim is:-
(1) A frame for an electric accumulator plate or electrode constructed and
applied as hereinbefore described in combination with a porous secondary battery
plate of the composition hereinbefore particularized or with other similarly co-
herent form of active material, substantially as hereinbefore described and shown.
Dated this 13th day of May. 1897.
GEO. H. RAYNER,
37, Chancery Lane, London, Agent for the Applicant.