An Improved Device for Casting Electric Accumulator Plates.
Year: 1894

page_text: Date of Application, 4th July, 1894
Complete Specification Left, 6th Mar., 1895-Accepted, 20th Apr., 1895
PROVISIONAL SPECIFICATION.
An Improved Device for Casting Electric Accumulator Plates.
I, CARL HAMPEL, of 10, Schulstrasse, Leopoldshall near Stassfurt, in the
Empire of Germany, Inspector of Machinery, do hereby declare the nature of this
invention to be as follows:-
:-
This invention relates to a device for casting electric accumulator plates having
the form of lattice work, the interstices of which become narrower from the inside
to the outside.
In the plates of this kind hitherto employed, it was necessary to set the two
halves of the lattice work one against the other, or to connect them by means of a
number of bars. In the latter case, such lattices could only be cast in sand.
In both cases, in addition to the extremely small surface, there was also the great
drawback that the paste, with which the interstices were filled, never formed a
coherent whole. As a result of this, on the charging and discharging of the
accumulator battery, unavoidable alterations of volume of the active substance are
always imparted to the whole active mass, and thus cause a deleterious and annoying
warping of the plates, and also thereby their destruction.
All these drawbacks are effectively removed by the casting device which forms
the object of this invention.
This invention consists in casting the lattice plate between two plates, each of
which has a number of openings corresponding to the number of interstices desired
to be formed in the lattice work.
Small prisms of a section tapering from one side to the other are inserted
between the two casting plates through these openings. This is done by first
approaching together, towards the centre of the interstice, two prisms lying opposite
one another, inserting them thus through the interstices, and then again separating
them. After the casting of the lattice, the prisms are again approached together
and then drawn out of the interstices of the casting plates, whereupon the lattices
may be freely withdrawn. The abovenamed prisms may either be arranged in
stamps with dove-tailed grooves, or on springs lying opposite one another
in pairs.
In the first case, an adjustable plate is vertically arranged in a casting box,
which plate has a number of projections or stamps corresponding to the desired
number of interstices in the lattice plate which is to be produced. These stamps
are arranged at regular distances apart and pass through and are accurately
guided by a second plate firmly connected by means of screws or in other suitable
manner with the box. The stamps also pass through another adjustable plate
arranged in the box. Between this latter plate and the fixed guide plate, the
lattice work is cast, the stamps serving as cores for forming the interstices. The
before mentioned prisms are arranged between the two casting plates and between
the stamps, say four to each stamp, and are held in dove-tailed grooves in the four
sides of the stamps, so that, when the stamps are drawn out, the prisms may slide
in these longitudinal grooves in the same. In order to bring the above named
prisms out of the cast lattice work, the stamps have the following form: the part
of each stamp within and between the three plates is prismatic. From this point,
the two opposite upper and lower surfaces of the projecting part run parallel to
one another, whilst the two side surfaces taper or gradually approach up to a given
distance apart. There is then a projection formed by the bar suddenly resuming

page_text: its original section. This tapering of the sides of the stamps has for its object to
cause two of the above named prisms on opposite sides of the stamp to approach
so far to one another that they can be drawn out of the openings in the lattice
work. The form of the stamp is repeated from the said projection, with the sole
difference that now the two surfaces carried further in a parallel direction are
opposed about 90 degrees to the former parallel surfaces, whilst the two other
surfaces taper or approach one another again up to a given distance. A
projection is arranged at the end of the stamp, which projection runs to a point,
this has merely for object to enable the stamp to be easily inserted in the openings
in the casting plates. By this means, the other pair of prisms may also be drawn
out of the openings in the lattice work by withdrawing the stamps further out of
the guiding or casting plates. On the re-insertion of the stamps in the two casting
plates, first the oue pair of prisms and then the other are again brought into their
original position. Dovetail grooves corresponding in section to dovetailed guides
on the prisms are formed in the sides of the stamps, which grooves always run
parallel to their respective surfaces. The one set of grooves only run as far as
the end of the first tapering, whilst the other set of grooves run to the pointed
heads of the stamps. When a plate has been cast in the above named mould,
the stamp-carrying plate is moved in the box until the stamps are drawn out of
the casting plates. As, however, the openings of the fixed casting plate exactly
correspond to the section of the stamps, the prisms remain between the casting
plates, whilst their dovetailed guides slide in the grooves of the stamps until the
prisms encounter the beforementioned projections. The tapering of the stamps is
carried to such an extent that two prismis lying opposite one another in front of the
one set of projections are so far approached together that they are free to pass
through the openings in the plates. When the stamps are quite out of the lattice
work, the adjustable casting plate is a little adjusted in the box to admit of the
finished lattice work being drawn out from above. In order to retain the prisms
in their correct positions on the insertion of the stamps, the prism guides are
provided with projections which rest against the fixed casting plate. On the
reinsertion of the stamps, the adjustable casting plate is again approached to the
fixed plate as far as the prisms admit.
In the second case the stamps are simply replaced by springs on the free ends
of which the prisms are arranged. The springs are arranged in pairs on two
plates placed one at each side of the casting plates, and the former plates are in
turn adjustable in the casting box. After the casting of the lattice, first one and
then the other of these plates is drawn away. In this way, one half of the pairs
of springs are drawn first out of the cast lattice by the first plate, and then the
other half which are diagonally opposed to the first named pairs are drawn out by
the second plate.
The springs are movably arranged on pivots in their respective plates, and one
spring of each pair is provided with a pin, which pin passes through the other
spring and is surrounded by a spiral spring. The latter has for its object to press
apart the ends of the springs which carry the prisms. On the opposite ends, the
springs are bent together and connected by means of pins. Between these ends
which are bent together, bars are placed which are attached to a common plate.
The whole arrangement is so formed that the prisms come between the two casting
plates as before described. After the casting, the bars arranged between each
pair of springs are pushed away in such a manner that the spiral springs between
each pair of springs are compressed, and thus the two prisms carried by the latter
are approached together. The plates which carry the pairs of springs are then
successively moved, so that these prisms are drawn out of the interstices in the
lattice.
In order that the one half of the pairs of springs may not impede the other
half, the springs of the one set are made narrower than those of the other set to
about twice the thickness of the latter springs, and the width of the prisms
attached to such springs is made correspondingly narrower.

page_text: The lattice work cast in the above named box has then interstices which appear
quadratic at the outside and the sides of which are equal. The parts of the
interstices which narrow from the inside to the outside are, however, of various
lengths. One of the two plates, between which the lattice work is cast, is fixed,
and the other is adjustable, so that the cast lattice may be easily removed from the
casting box.
The prisms may be of any suitable section. The prisms may also be provided
with dovetailed grooves, and the stamps with the corresponding guides, instead of
rice versa, without essentially altering the nature of the invention.
Dated this 2nd dov of Lule 1001
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicant.
I, CARL HAMPEL of 10 Schulstrasse, Leopoldshall near Stassfurt in the Empire
of Germany, Inspector of Machinery, 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:-
This invention relates to a device for casting accumulator plates having the form
of lattic work, the interstices of which become narrower from the inside to the
outside.
This invention consists in casting the lattice work between two plates, each
of which has a number of openings corresponding to the number of interstices
desired to be formed in the lattice work. Small prisms of a section tapering from
one side to the other are inserted between the two casting plates through these
openings. This is done by first approaching together, towards the centre of the
interstice, two pristns lying opposite one another, inserting them thus through the
interstices and then again separating them. After the casting of the lattice
the prisms are again approached together, and then drawn out of the interstices of
the casting plates, whereupon the lattice may be freely withdrawn.
The device employed may be described in the following manner with reference
to the accompanying drawings in which two forms of construction are shown. In
the first.case (Figures 1 to 6) the above named prisms are arranged in stamps with
dovetailed grooves, while in the second case (Figures 7 to 14) the prisms are
arranged on springs lying opposite one another in pairs.
Figure 1 is a vertical section of this improved casting box;
Figure 2 is the corresponding horizontal section ;
Figure 3 shows a face view of an accumulator plate cast in this casting box ;
Figure 4 is a vertical section on the line xx of Figure 3;
Figure 5 is a longitudinal section on the line y y of Figure 4;
Figure 6 is a section through one of the core bars on the line z z of Figure 2 ;
Figure 7 is a vertical section of another form of construction;
Figure 8 is a horizontal section of same;
Figure 9 shows the face view of an accumulator plate cast in this modified form
of mould.
Figure 10 is a vertical section on the line of Figure 9;
Figure 11 shows a part of the plate in longitudinal section on the line y' y' of
Figure 10;
Figure 12 is a horizontal section on the line y' y' of Figure 9;
Figure 13 shows the arrangement of the parts serving for forming the lattice
openings;
Figure 14 is a section of same on the line a¹ 2¹.

page_text: An adjustable plate b is vertically arranged in a casting box a, which plate has
a number of projections or stamps (Figures 1-2) corresponding to the desired
number of interstices in the lattice plate which is to be produced (Figure 3). The
stamps c are arranged at regular distances apart and pass through and are accurately
guided by a second plate d firmly connected by means of screws e or in other
suitable manner with the box. The stamps care of the form shown in Figures 1
and 2 and also pass through another movable plate f arranged in the box a. The
movable plate is accurately guided by the bottom and the sides of the box a.
Between the plate d and the plate f the lattice work is cast, the stamps c serving
as cores for forming the interstices. The before mentioned prisms g are arranged
between the two end plates d and f, four to each stamp and are held in dovetailed
grooves in the four sides of the stamps so that when the stamps are drawn out,
the prisms with their dovetailed guides may slide in the longitudinal grooves m
and n (Figures 1 and 2). In order to bring the prisms 9 out of the cast lattice
work, the stamps c have the following form. From the plate to the outer face
of the plate the stamp c is prismatic. From this point the two opposite upper
and lower surfaces of the projecting part run parallel to one another, whilst the
two side surfaces taper or gradually approach up to a given distance apart. There
is then a projection formed by the bar suddenly resuming its original section.
This tapering of the sides of the stamps c has for its object to cause two of the
above named prisms on opposite sides of the stamp to approach so far to one
another that they can be drawn out of the openings in the lattice work. The form
of the stamp c is repeated from the said projection i with the sole difference that now
the two surfaces carried further in a parallel direction are opposed about 90 degrees
to the former parallel surfaces, whilst the two other surfaces taper or approach
one another again up to a given distance. A projection k is arranged at the end
of the stamp c, which projection runs to a point, this has merely for object to enable
the stamp to be easily inserted in openings in the casting plates.
On the insertion of the stamps in the two casting plates, first the one pair of
prisms and then the other are brought into their required position. Dovetailed
grooves m and n corresponding in section to dovetailed guides (Figure 6) on the
prisms are formed in the side of the stamps c, which grooves always run parallel
to their respective surfaces. The grooves m only run as far as the end of the first
tapering at the point i, whilst the other grooves n run to the pointed heads k of
the stamps c (Figures 1 and 2). When a plate has been cast in the abovenamed
mould the stamp carrying plate bis moved in the box a until the stamps are drawn
out of the casting plates. As however the openings of the fixed casting plate d
exactly correspond to the section of the stamps c, the prisms g remain between the
casting plates, whilst their dovetailed guides slide in the grooves m and n of the
stamps c until the prisms encounter the projection and k. The tapering of
the stamps c is carried to such an extent that two prisms lying opposite to one
another in front of the one set of projections are so far approached together that
they are free to pass through the openings in the plates. When the stamps are
quite out of the lattice work the adjustable casting plate f is a little adjusted in
the box to admit of the finished lattice work being drawn out from above.
In order to retain the prisms g in their correct positions on the insertion of the
stamps c, the prism guides are provided with projections o, which rest against the
fixed casting plate d. On the re-insertion of the stamps the adjustable casting
plate fis again approached to the fixed plate d as far as the prisms g admit.
The second form of the mould is represented in Figures 7. to 14.
In this case
the stamps c are simply replaced by springs p and q, on the free ends of which the
prisms are arranged. The springs are fastened in pairs on two plates 6' placed one
at each side of the casting plates d and f. The plates are adjustable in the
casting box. After the casting of the lattice, first one and then the other of the
plates bis drawn away. In this way one half of the pairs of springs are drawn
first out of the cast lattice by the first plate, and then the other half, which are
diagonally opposed to the first named pairs, are drawn out by the second plate.

page_text: J.
The springs p and are movably arranged on pivots in their respective
plates b. One spring of each pair is provided with a pin e, which pin passes
through the opposite spring and is surrounded by a spiral spring w (Figures 7 and 8).
The spring w has for its object to press apart the ends of the springs P and
On the opposite ends the springs are bent together and connected by pins t.
Between the springs, bars are placed, which are attached to common plates s.
The whole arrangement is such that the prisms come between the two casting
plates d and f. After the casting, the bars r arranged between the pairs of
springs 9 are pushed away in such a manner that the spiral springs ware compressed
and thus the two prisms y carried by the springs are approached together. Then
the respective plate is drawn away, so that the one pair of prisms g is drawn out
of the interstices in the lattice.
In the same way the bars arranged between the springs p are pushed away so
that the other spiral springs w are compressed and thus the two other prisms
carried by the springs q are approached together. Then the other plate 6 is drawn
away so that the other pair of prisms g is also drawn out of the interstices in the
lattice.
In order that the springs p and q may not impede one another, the springs 7 are
made narrower than the springs p to about twice the thickness of the springs p,
and the width of the prisms attached to such springs is made correspondingly
narrower (Figures 13 and 14). The lattice work cast in the described mould has
then interstices which appear quadratic at the outside. The parts of the interstices
which narrow from the inside to the outside are, however, of various length
(Figures 9 to 12).
The prisms may be of any suitable section. The prisms may also be provided
with dovetailed grooves, and the stamps with the corresponding guides, instead of
vice versa, without essentially altering the nature of the invention.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
:-
1. An improved device for casting electric accumulator plates with openings
tapering from the inside to the outside, consisting of a plate b adjustably arranged
in a casting box a and carrying a number of stamps c corresponding to the desired
number of interstices in the lattice plate, said stamps being formed with dovetailed
grooves m n in which slide prisms for forming interstices tapering from the inside
to the outside, whereby on the plate which carries the stamps being moved along
the box away from the cast lattice plate, first the pairs of prisms standing opposite
one another and then the other pairs emerge from the interstices in the lattice
work, substantially as described and shown.
2. In the device described in Claim 1, the replacement of the stamps by springs p
or 9 for carrying the prisms, said springs being so arranged in two adjustable
plates that the prisms are approached to one another in pairs and may be with-
drawn one set of pairs after the other from the plates d or f bordering the lattice.
work at the sides substantially as described and shown.
Dated this 5th day of March 1895.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicant.