Improved Manufacture of Electric Battery Plates.
Year: 1899

page_text: Improved Manufacture of Electric Battery Plates.
I, Dr. ERNST ANDREAS, Engineer, of Rosenstrasse 105-107, Dresden, in the
Kingdom of Saxony, do hereby declare the nature of this invention to be as
follows:-
The present invention relates to the manufacture of electric battery plates
whereby the surface of the plates formed of metallic lead is very large relatively
to the space occupied.
A great number of experiments have already been made to obtain the best
efficiency and operative surface. The first suggestion was to provide the surface
of the lead plates, for the purpose of increasing their operative surface, with
grooves and ribs and like projections and recesses by means of presses, rollers
and the like. Then in order to still further increase the surface of such lead
plates they were provided with ribs, by roughening them. . For instance, it has
been proposed to produce this roughening of the surface of ribbed and grooved
electrode plates by means of a jet of sand or by a similar blowing device.
This method can of course be easily carried out in a practical way, but it
affords only a very limited amount of roughening, inasmuch as it is impossible
to cut by means of a sand jet blower very deeply into the interior of the plates.
The object of the present invention is a process by means of which it is
possible to increase to a very great extent the active surface of battery plates,
and consists in subjecting the plates to the action of a file cutting machine or
one producing similar effects. It is thus possible to provide a great number of
plates with closely arranged grooves or cuts penetrating deeply into the material
of the plates, and to do the work in a short time and with a small amount of
labour. This method is also advantageous by reason of the fact that by means
of such a cutting machine the recesses can be arranged or cut uniformly and
may be formed in the plates in an oblique direction.
In manufacturing these plates, first a stout lead plate of the desired shape
is pressed, the two press plates being provided with triangular, roof or other
shaped recesses.
By this shaping, in the first instance, of the surface of the plate, it is easily
understood that the working surface is already considerably increased.
The plate having been thus shaped is then treated by a file cutting machine
or by a machine of similar kind."
By this means the surface of the plate which becomes more dense in conse-
quence of the pressure, is again somewhat loosened, and the working surface is
very considerably increased, and finally the recesses produced by the cutting
machine, and formed say obliquely in the material of the plate afford a very
good hold for the oxide.
There is left between the two surfaces or sides of the plate, in the centre,
a solid portion into which the cross cuttings do not penetrate, and which gives
the necessary stiffness to the plate. This portion can be made of any strength

page_text: or section according to requirements and the purpose the plate is to serve, the
recesses of the plates permitting an even and easy penetration of the acid into
the cuts between the ribs or projections.
Ki
I
f
1900
"
7.
COMPLETE SPECIFICATION.
IVORY
Improved Manufacture of Electric Battery Plates.
I, Dr. ERNST ANDREAS, Engineer, of Rosenstrasse 105-107, Dresden, in the
Kingdom of Saxony, do hereby declare. the nature of this invention and in
what manner the same is to be performed, to be particularly, described and
ascertained in and by the following statement :-
-
:.
The present invention relates to the manufacture of electric battery plates
whereby the surface of the plates formed of metallic lead is very large relatively
to the space occupied.
A great number of experiments have already been made to obtain the best
efficiency and operative surface. The first suggestion was to provide the surface
of the lead plates, for the purpose of increasing their operative surface, with
grooves and ribs and like projections and recesses by means of presses, rollers
and the like. Then in order to still further increase the surface of such lead
plates they were provided with ribs, by roughening them. For instance, it has
been proposed to produce this roughening of the surface of ribbed and grooved
electrode plates by means of a jet of sand or by a similar blowing device.
This method can of course be easily carried out in a practical way, but it
affords only a very limited amount of roughening, inasmuch as it is impossible
to cut by means of a sand jet blower very deeply into the interior of the plates.,
The object of the present invention is a process by means of which it is
possible to increase to a very great extent the active surface of battery plates,
and consists in subjecting the plates to the action of a filé cutting machine or
one producing similar effects. It is thus possible to provide a great number of
plates with closely arranged grooves or cuts penetrating deeply into the material
of the plates, and to do the work in a short time and with a small amount of
labour. This method is also advantageous by reason of the fact that by means
of such a cutting machine the recesses can be arranged or cut uniformly and
may be formed in the plates in an oblique direction.
For the better understanding of the invention the accompanying drawing
represents a portion of a plate made according to this invention.
Figure 1 is a side view,
Figure 2 a cross section, and
Figure 3 a longitudinal section.
In manufacturing these plates, first a stout lead plate of the desired shape
is pressed, the two press plates being provided with triangular roof or other
shaped recesses, the plates on coming out of the press representing, in cross
section, the shape shown in Figure 2.
By this shaping, in the first instance, of the surface of the plates, it is easily
understood that the working surface is already considerably increased.
The plate having been thus shaped is then treated by a file cutting machine
or by a machine of similar kind."
F
By this means the surface of the plate which becomes more dense in conse-
quence of the pressure, is again somewhat loosened, and the working surface lis
31

page_text: very considerably increased, and finally the recesses produced by the cutting
machine, and formed say obliquely in the material of the plate afford a very
good hold for the oxide.
In the drawing the ribs or projections of the plate are marked a, the corre-
sponding recesses b, and the cuts produced by the file cutting machine c.
As shown in the drawing there is left between the two surfaces or sides of
the plate, in the centre a solid portion into which the cross cuttings do not
penetrate and which gives the necessary stiffness to the plate. This portion can
be made of any strength or section according to requirements and the purpose
the plate is to serve, the recesses of the plates permitting an even and easy
penetration of the acid into the cuts between the ribs or projections.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:—
1. The manufacture of electric battery plates consisting in forming the
plates with roof like projections and recesses or the like and then cross-cutting
the projections in a file cutting or like machine substantially as described.
2. Electric battery plates constructed substantially as described, or illustrated
in the accompanying drawings.
Dated this 12th day of March 1900.
BOULT, WADE & KILBURN,
Agents for the Applicant.