Improvements in and relating to Accumulator Plates.
Year: 1897

page_text: Improvements in and relating to Accumulator Plates.
I, WILHELM MAJERT, of 2, Gericht Street, Berlin, N., in the Empire of Ger-
many, Accumulator Manufacturer, do hereby declare the nature of this invention
to be as follows:-
This invention relates to accumulator plates for high current density and high
capacity which can only be produced by increasing the surface. This increase is
effected by dividing up the core plate on both surfaces into fine thin strips which
are formed by means of a suitable tool into vertical ribs. These ribs are
connected at their bases to the core of the plate.
The process of manufacture employed with these plates enables strips or ribs
to be formed of such a thinness as cannot be produced for practical working by
the method of casting which is now generally employed.
These plates have the advantage that with a minimum weight and most favor-
able utilisation of the material by means of the resulting large surface, the highest
current density can be employed in charging as well as in discharging.
The manufacture of these plate cores may be effected in a two-fold manner viz.,
either by removing a strip or shaving so as to form a groove or channel, and then
dividing the inclined wall surface from the material of the plate by means of
another cutting edge of the tool, or by means of a separate or special tool, and
turning up the same into a vertical position; or this operation may be effected
without first making a groove or channel, that is to say the tool is caused to
separate from the very first the strip in an inclined position from the plate, and
bend it up into the form of a rib.
In the first case the surface or bottom between the ribs will form a more or less
plane surface, whilst in the latter case the said bottom surface constitutes an
inclined or curved surface.
These plates in the finished state have the peculiar characteristic of being
thicker, measured through the ribs, than the plates from which they have been
produced.

page_text: and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:
-
This invention relates to accumulator plates for high current density and high
capacity which can only be produced by increasing the surface: This increase is
effected by dividing up the core plate on both surfaces into fine thin strips which
are formed by means of a suitable tool into vertical ribs. These ribs are
connected at their bases to the core of the plate.
The process of manufacture employed with these plates enables strips or ribs
to be formed of such a thinness as cannot be produced for practical working by
the method of casting which is now generally employed.
These plates have the advantage that with a minimum weight and most favor-
able utilization of the material by means of the resulting large surface, the highest
current density can be employed in charging as well as in discharging.
The manufacture of these plate-cores may be effected either.by.removing a strip
or shaving so as to form a groove or channel, and then dividing the inclined wall
surface from the material of the plate by means of another cutting edge of the
tool, or by means of a separate or special tool, and turning up the same into a
vertical position; or this operation may be effected without first making a groove
or channel, that is to say the tool is caused to separate from the very first the strip
in an inclined position from the plate, and bend it up into the form of a rib.
In the first case the surface or bottom between the ribs will form a more or less
plane surface, whilst in the latter case the said bottom surface constitutes an
inclined or curved surface.
These plates in the finished state have the peculiar characteristic of being
thicker, measured through the ribs, than the plates from which they have been
produced.
In the accompanying drawings, Figure 1 illustrates a plate having a previously
formed channel or groove. Figure shows a plate without a previously formed
groove or channel. Figures 3 to 6 illustrate the various directions of the ribs.
Figures 7 8 and 9 illustrate a cutter or tool with double cutting edge for making
the plates shown in Figure 1. Figures 10, 11, & 12 show a cutter or tool with
cutting edge for making the plate shown in Figure 2.
The plates consist of the solid core plate a in which, as shown in Figure 1, a
groove or channel e is cut out by means of the cutter illustrated in Figures 7, 8 & 9.
This steel cutter is clearly shown in side elevation, end elevation and plan on
Figures 9, 8 & 7 respectively, of the drawings; the front or entering edge of the
tool when in operation being at s.
The tool is constructed as follows,-A cutting points is followed by the two
edges, 2, 3, and 2, 4, which form two sides of the flat surface 2, 3, 4, while a
hollow 1, 2, 3, in the side of the tool cause the edge 2, 3 to protrude sharply.
Rising obliquely from the surface 2, 3, 4 is another cutting point t, which is
not in the same plane as the travel of the points but (as may be seen in the
plan Figure 7) is to one side of it.
The operation of the hereinbefore described cutting tool in forming accumulator
plates such as shown on Figure 1 of the drawings is as follows. Starting at the
edge of the plate a to be operated on, the tool on its first stroke removes a groove.
by the front of the cutting points and of the shape shown at f on Figure 1,
while simultaneously with this action the thin cutting point t divides the metal
beyond ne wall of the groove at a transverse distance equal to s, t, Figure 7.
The tool is now moved transversely across the plate a distance equal to s, t, and
upon making a second stroke the cutters removes a second strip by its front or
cutting edge while by its curved side 1, 2, 3, it sets up the wall (formerly divided
by the edge ) into a ridge; and also simultaneously with this action on the
second stroke the cutting edge again divides the metal beyond the fresh groove.
This process is repeated until the whole plate has been formed into ridges and
grooves disposed in any suitable way straight or curved as illustrated in
Figures 3, 4, 5 & 6 of the drawings. The plate shown in Figure 2 is operated

page_text: upon by a tool which divides and sets up the metal without any loss instead of
removing a strip as in the previously described modification. This tool is shown
in side elevation, end elevation and plan on Figures 10, 11 and 12 of the drawings
respectively; and is constructed and operated as follows:-
A cutting edge s, t, enters the metal for a depth nearly equal to the vertical
depth s, t, in the direction of the tools' length, the parts of the edge being in
advance during cutting. The metal is thus divided obliquely and it slips onto the
surface 5, 6, 7, 8, which placed in the position shown in the drawings erects the
divided metal into a rib. It is to be understood that with this tool it is prefer-
able to start at one edge of the plate, and that by varying the depth of the cutting
edge s, t, and the form of the surface 5, 6, 7, 8, the proportions and shapes of the
ribs may be also varied.
By means of this process herein described the plates can be produced on the
lathe as well as in the planing machine.
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. An accumulator plate consisting of a lead plate upon which are formed ribs
which are separated from the body of the material of the plate by mechanical
means, said ribs being still connected at their base to the leaden plate and which
ribs may be arranged in straight lines or in a spiral line or in any other suitable
manner substantially as described.
2. The process of making a plate specified in Claim 1 consisting in that the
cutting tool by means of a surface situated behind its cutting edge bends the strip
that has been divided from the plate into the form of a rib; the bending surface
being also separate from the cutting edge if desired.
3. Improvements in and relating to accumulator plates substantially as herein-
before described.
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents.