Improvements in and relating to Moulds for Casting Grids for the Active Material of Electrical Accumulators.
Year: 1894

page_text: Date of Application, 6th Apr., 1894
Complete Specification Left, 21st Dec., 1894-Accepted, 26th Jan., 1895
PROVISIONAL SPECIFICATION.
Improvements in and relating to Moulds for Casting Grids for the
Active Material of Electrical Accumulators.
We GOTTFRIED HAGEN, trading in the name of "Kölner Accumulatren-
Werke Gottfried Hagen" of No. 115 Rolshoferstrasse at Kalk near Cologne
in the Kingdom of Prussia, German Empire and CARL BEYER of No. 114
Rolsdorferstrasse at the same place do hereby declare the nature of said invention
to be as follows:-
This invention relates to moulds for casting the grids which serve as a skeleton,
retainer or support for the active material of electric accumulators (secondary
batteries, storage batteries) more particularly to that class of such moulds which
are composed of two movable plates provided regularly with projections on their
sides facing each other, these plates of the mould being so fitted upon one another
for closing the mould that the projections on each plate, by penetrating into the
openings or interstices between the projections on the other plate, confine empty
spaces which correspond to the bars of the grid, retainer or support to be
cast and have a triangular transverse section with the base of the triangle turned
outwards.
According to the present invention the plates of the mould are provided with
ribs running parallel to one another on each plate, which, instead of being
upright are inclined to the plate so that one side of the ribs forms an acute angle
and the other side of the ribs an obtuse angle with the surface of the plate. On
both plates the ribs have the same angle of inclination, the same depth and are at
the same distance from each other. The ribs of the two plates may be so inclined
that the sides of all the ribs of both the plates are parallel to each other, or so
that the sides of the ribs on one plate cross the sides of the ribs on the other
plate when the mould is closed. The two plates are so guided in a frame that
they can be moved at the same angle at which the ribs are inclined, towards each
other for closing the mould in order to effect the casting, and away from each
other for opening the mould in order to lay bare the grid formed. When the two
plates are pushed together the ribs on each plate pass into the interstices, spaces or
openings between the ribs on the other plate, but they do not completely fill up the
same, so that enclosed spaces of definite size and transverse section are produced
which extend from one side of the mould to the other side. These spaces serve
for the formation of the grid bars extending in one direction. As such empty
spaces remain on each plate, two parallel rows of bars are produced by the casting,
which rows are separated by a greater or smaller intermediate space. In case the
sides of the ribs are parallel to each other the said empty spaces on one plate are
exactly opposite those on the other plate after the plates have been fitted together;
whereas if the sides of the ribs cross each other the said empty spaces on one
plate alternate with those on the other plate. For forming the grid bars extending
in the other direction the ribs are provided with grooves or recesses parallel to
each other and arranged at equal distances apart, such grooves or recesses being at
a right angle to the longitudinal direction of the ribs. These grooves or recesses
may either have a corresponding position in all the ribs, in order to produce trans-
verse bars extending from one side of the grid to the other; or those formed in
one rib may come opposite the solid portions separating those of the two
neighbouring ribs, in which case the transverse bars extend only from one longi-
tudinal bar to the other, and every following row of transverse bars alternates

page_text: with those of the preceding and following row, while in these two rows the trans-
verse bars correspond with regard to their relative position. The grooves or
recesses suitably extend over the entire height of the ribs so that the transverse
bars in the direction of their height extend over the whole distance between the
two plates and are common to both sides of the grid, thereby forming a grid of
great strength. By making the transverse section of the ribs of suitable form
grids may be produced the longitudinal bars of which have a transverse section
different from a triangle, and are united by a web.
Dated this 6th day of April 1894.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.
°
Improvements in and relating to Moulds for Casting Grids for the
Active Material of Electrical Accumulators.
We, GOTTFRIED HAGEN trading in the name of "Kölner Accumulatoren-
Werke Gottfried Hagen" of No. 115 Rolshoferstrasse at Kalk near Cologne in
the Kingdom of Prussia, German Empire, and CARL BEYER of No. 114
Rolshoferstrasse at the same place, 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 moulds for casting the grids which serve as a skeleton,
retainer or support for the active material of electric accumulators (secondary
batteries, storage batteries), more particularly to that class of such moulds which
are composed of two movable plates provided regularly with projections on their
sides facing each other, these plates of the mould being so fitted upon one another
for closing the mould that the projections on each plate, by penetrating into the
openings or interstices between the projections on the other plate, confine empty
spaces which correspond to the bars of the grid, retainer or support to be
cast and have a triangular transverse section with the base of the triangle turned
outwards.
According to the present invention the plates of the mould are provided with
ribs running parallel to one another on each plate, which, instead of being upright,
are inclined to the plate so that one side of the ribs forms an acute angle and the
other side of the ribs an obtuse angle with the surface of the plate. On both
plates the ribs have the same angle of inclination, the same depth and are at the
same distance from each other. The ribs of the two plates may be so inclined
that the sides of all the ribs of both the plates are parallel to each other, or so
that the sides of the ribs on one plate cross the sides of the ribs on the other
plate when the mould is closed. The two plates are so guided in a frame that
they can be moved, at the same angle at which the ribs are inclined, towards each
other for closing the mould in order to effect the casting, and away from each
other for opening the mould in order to lay bare the grid formed. When the two
plates are pushed together the ribs on each plate pass into the interstices, spaces or
openings between the ribs on the other plate, but they do not completely fill up the
same, so that enclosed spaces of definite size and transverse section are produced
which extend from one side of the mould to the other side. These spaces serve
in
for the formation of the grid bars extending in one direction. As such empty
spaces remain on each plate, two parallel rows of bars are produced by the
casting, which rows are separated by a greater or smaller intermediate space.
case the sides of the ribs are parallel to each other the said empty spaces on one
plate are exactly opposite those on the other plate after the plates have been fitted
together; whereas if the sides of the ribs cross each other the said empty spaces

page_text: on one plate alternate with those on the other plate. For forming the grid bars
extending in the other direction the ribs are provided with grooves or recesses
parallel to each other and arranged at equal distances apart, such grooves or
recesses being at a right angle to the longitudinal direction of the ribs. These
grooves or recesses may either have a corresponding position in all the ribs, in
order to produce transverse bars extending from one side of the grid to the other;
or those formed in one rib may come opposite the solid portions separating those
of the two neighbouring ribs. in which case the transverse bars extend only from
one longitudinal bar to the other, and every following row of transverse bars
alternates with those of the preceding and following rows, while in these two rows
the transverse bars correspond with regard to their relative position. The grooves
or recesses suitably extend over the entire height of the ribs so that the transverse
bars in the direction of their height extend over the whole distance between the two
plates and are common to both sides of the grid, thereby forming a grid of
great strength. By making the transverse section of the ribs of suitable form
grids may be produced the longitudinal bars of which have a transverse section
different from a triangle.
In order that our invention may be properly understood we will proceed to
describe more fully the chief constructional forms of the same, reference being
made to the accompanying drawings, of which
Fig. 1 is a schematical horizontal section through a mould constructed according
to this invention ;
Fig. 2 a transverse section through a portion of a pair of plates fitted upon
each other, and provided with ribs the sides of all of which are parallel to each
other;
Fig. 2 a section through line 2ª-2ª Fig. 2;
Fig. 3 a transverse section through a portion of a pair of plates fitted upon each
other, the sides of the ribs of one plate crossing the sides of the ribs of the
other plate.
Fig. 4 a transverse section through a portion of a pair of plates fitted upon
each other and provided with ribs shown as in Figs. 2 and 2ª but having a somewhat
modified sectional form;
Fig. 5 a transverse section through a portion of a pair of plates fitted upon
each other and provided with ribs as shown in Fig. 2, the transverse grooves of the
ribs alternating with each other;
Fig. 5 a section according to line 6-6, Fig. 5;
Fig. 6 a plan and two end views of a portion of a grid showing different
arrangements of bars.
With reference to Fig. 1 a mould constructed according to this invention
comprises two plates a and b provided with ribs, respectively a¹ and b¹, and a
frame c in which the plates are movable. The frame constitutes a rhomb, the
inclination of its sides corresponding to the inclination of the ribs a' and b¹ on the
mould plates. For operating the mould plates we provide two screws d d¹ which
work through nuts or bearings e e¹ held in the front and rear of the frame. By
its inner end each of the screws is held in a reinforce respectively a* and 6* on
the rear of one or the other plate so that it can turn but cannot separate from its
plate. On its outer end each screw carries a crank respectively f and f¹.
When the two screws are turned in one direction the inould plates a and b
move towards each other, and when they are turned in the other direction they
are moved apart.
As shown in Fig. 1 and more clearly in Fig. 2, the ribs a¹, 61 are inclined
towards the plates; the ribs a' form an obtuse angle with their right-hand side,
whilst the ribs 6' form an obtuse angle with their left-hand side. The consequence
is that all the sides of the ribs are parallel to each other. On the side of the
acute angle each rib at the free end has its edge cut away so as to produce a
vertical surface respectively a' and 65 (see Fig. 2). When the two plates a and b
are moved close together by means of the screws d d', the ribs on each plate pass

page_text: In this
into the spaces between the ribs on the other plate until the vertical surfaces a b³
come in contact (see position of plates shown in dotted lines in Fig. 1).
case the ribs slide with their obtuse-angled sides respectively a², 62 upon each
other. The vertical surfaces a³, 65 have such dimensions that the rib will pass with
the upper edge of its obtuse-angled side against the plate. In this manner we
form two opposite rows of empty spares g enclosed on all sides, these spaces
having a triangular transverse section with the base of the triangle turned
outwards. The base and one side of the triangle are formed by one of the
plates a, b and the acute angled side a³ ³ of the rib on this plate, while the second
side is formed by the terminal surface a', ' of the rib on the other plate. When
the metal is cast into the mould, it fills up the empty spaces g and at the same time
also the transverse grooves or incisions (see Fig. 2A) in the ribs, whereby, as
already mentioned, the transverse bars are formed. After the metal cast into the
mould has cooled, the latter is opened by turning the screws d d back. The grid
produced has continuous longitudinal and transverse ribs respectively and k
extending over its entire length and width, as shown in the section a of the plate
represented in Fig. 6.
In the modified arrangement shown in Fig. 3, the ribs a¹ and 6' on the two plates a
and 6 form an obtuse angle on the right-hand side and an acute angle on the left-
hand side, that is to say, the prolongations of the sides of two conjointly acting
ribs cross each other. The free end of each rib is so bevelled that the terminal
surface a, b, will be parallel to the obtuse angles side a², 62, of the opposite rib.
On pushing the plates together the ribs a and b do not slide with the sides a² and b³
upon one another, but the terminal surfaces a, b slide respectively upon the
sides 62, a². The parts have such dimensions that each rib will bear with the
upper edge of its terminal surface against the opposite plate. Thus empty spaces g
of triangular form are again produced, but with the modified arrangement of the
ribs the spaces of the two rows are not opposite but alternate with one another,
whereby a grid is produced in which the longitudinal bar i alternate with each
other as represented in the section z of Fig. 6.
In another modification shown in Fig. 4 the ribs a, b are arranged as in Fig. 2,
whilst their free ends are formed somewhat differently, inasmuch as the upper
edge of the terminal surfaces a³, 64 is cut away parallel to the plate so that a
surface a, b, is obtained with which the rib bears against the plate. By this
arrangement two rows of spaces 9 are produced which are not opposite each other
but nearly so.
The section y of Fig. 6 represents a grid in which the transverse bars k do not
extend from one side to the other, but alternate with each other and reach only
from one longitudinal bar i to the following one. In order to attain this, the
grooves or incisions are arranged as shown in Figs. 5 and 5ª, that is to say, those
in each pair of co-operating ribs alternate with those in the preceding and following
pair of ribs.
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 :
In moulds for casting grids for the active material of electrical accumulators,
the combination, with two plates movable towards and away from each other, of
ribs (a, b) arranged on the facing sides of said plates in inclined position and
provided with transverse grooves, substantially as described.
Dated this 21st day of December 1894.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicants.