An Improved Method of and Means for the Production of the Grids of Electric Accumulators in which the Bars Narrow from Each Side Inwards.
Year: 1889

page_text: Date of Application, 16th Dec., 1889
Complete Specification Left. 21st Dec., 1889-Accepted, 25th Jan., 1890
PROVISIONAL SPECIFICATION.
An Improved Method of and Means for the Production of the Grids
of Electric Accumulators in which the Bars Narrow from Each
Side Inwards.
I, ERICH CORRENS of Thurmstrasse, Berlin, in the German Empire, Electrician, do
hereby declare the nature of this invention to be as follows:-
The moulding of the grids or supporting frames of electric accumulators in which
the bars narrow from the two sides inwards presents great difficulties as the cores
must be larger towards the inside than are the cloar spaces between the bars on the
two outer sides so that cores of such form cannot be removed bodily from the grid.
For this reason the core for a grid must be in several parts. The invention is based
on this principle.
Taking by way of example a grid formed with square fields those of one side of
the grid being situate zigzag, or unevenly over those of the other side so that
through one field of one side the crossing part of four fields of the other side are
visible, the points or thinner parts of the bars being intermediate between the two
sides and their larger bases on the two outer sides, the cross section being triangular.
The cores are placed upright on a plate of the bottom mould casing to which they
may be fixed. In them are formed wedge shaped recesses crossing each other.
These recesses form the mould for the grid bars of one side of the grid. A second
set of cores and a plate arranged in like manner for moulding the other side of the
grid but inversely, and so that when the grids has been cast the two bodies of cores
may be each separately removed the one from one side or face of the cast grid and
the other from the opposite side of the same.
The grid openings instead of being square may have other forms, as circular,
polygonal, etcetera.
CAPITAINE & VON HERTLING,
89, Chancery Lane, London, W.C., Agents for the Applicant.
COMPLETE SPECIFICATION.
An Improved Method of and Means for the Production of the Grids
of Electric Accumulators in which the Bars Narrow from Each
Side Inwards.
I, ERICH CORRENS of Thurmstrasse, Berlin, in the German Empire, Electrician,
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 moulding of the grids or supporting frames of electric accumulators in which
the bars narrow from the two outer sides inwards presents great difficulties, as the
cores must be larger towards the inside than are the clear spaces between the bars on
the two outer sides so that cores of the required form cannot be removed bodily from
the cast grid. For this reason it has hitherto been necessary to make the cores of
grids of the kind referred to, in several parts each of which may be separately with-
drawn. The invention has for object to remedy this inconvenience.
In the accompanying drawing Figs. 1 and 2 are respectively a side view and a
vertical cross section of a grid such as may be produced by means of this invention.
It has on each of its two sides square grid fields, those of one side being so situate
with reference to those of the other side that the cross formed by the junction of four

page_text: bars on the one side is visible through each respective field on the other side the
crosses having their points or apices directed to the inside of the grid, their bases
being on the outside, and their cross section triangular. Let it be supposed that a
coro or mould formed with a face corresponding to the form of the crosses of the
one side be passed through the square fields of the other side in the manner shewn
in Fig. 3, the grid then reversed shewing a figure like that previously presented, that
is to say, a cross being visible through each square field, which cross now forms a
portion of the other grid part, then. a second and similar core or mould introduced
through the square fields so that one core will meet the other and both in conjunction
form a mould for the whole grid, such as shewn in vertical section in Fig. 4.
Fig. 5 is a horizontal section of the mould taken through line -y of Fig. 4.
The cores a are upright on a plate p of the bottom mould casing to which plate
they may be fixed. They have the conical or wedge shaped recesses in cross form
for moulding the grid bars of the part lying uppermost. The cores b have on their
moulding faces with which they come in contact with plate p recesses similar to those
just mentioned and also located on a plate of the upper mould casing which comes
in contact with the front surfaces of cores a. The recesses a and b in conjunction
with plates and form the mould for the grid. When this has been cast the
cores a may be withdrawn from one side of the casting and the cores from the
other side of the same.
The grid fields instead of being square, may be round or polygonal as shewn in
Fig. 7.
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. The process of moulding grids or supporting frames of electric accumulators
the bars of which narrow inwards from the outside and in which the fields of the one
side are placed zigzag or uneven with those of the other side, by means of two sets
of cores having on their meeting faces taper or wedge shaped recesses corresponding
to the required form of the grid bars and closeable by plates set the thickness of a
grid apart, substantially as described and shewn.
•
2. A mould for moulding a grid or meshed network the bars of which narrow
inwards from the outside and in which the fields of the one side are placed zigzag or
uneven with those of the other side, consisting of two mould plates the core parts.
projecting from which have on their front ends taper or wedge shaped recesses
corresponding to the required form of the grid bars, the cores of the one mould
plate taking in between the cores of the other mould plate, so that the left hand
side or half of the grid is formed by the recesses of the right hand mould plate and
vice versa, substantially as described and shewn.
3. For the purpose of casting grids of the kind referred to, the two mould parts
arranged so that the projections of the one part engage in the recessos of the
other part and thus form a closed mould, substantially as described and shewn.
4. A mould composed of two mould parts the projections or cores of which, in the
case of polygonal fields are set polygonally to one another and when entered the one
part into the other form a mould in the manner that for six sided polygons the
division is such that the cores are triangular, substantially as described with reference
to Fig. 7.
Dated this 21st day of Decomhar 1000