Improvements in Grids or Containers for the Elements or Plates of Secondary Batteries, and Moulds to be used in their Manufacture.
Year: 1889

page_text: Date of Application, 12th June, 1889
Complete Specification Left. 12th Mar., 1890-Accepted, 26th Apr., 1890
PROVISIONAL SPECIFICATION.
Improvements in Grids or Containers for the Elements or Plates of
Secondary Batteries, and Moulds to be used in their Manufacture.
We THE ELECTRICAL POWER STORAGE COMPANY Limited of 4 Great Winchester
Street in the City of London and PERCY JAMES REA of the same place Electrical
Engineer do hereby declare the nature of this Invention to be as follows:-
According to this Invention a mould or chill is provided for the casting of secondary
battery grids or containers for the active material or materials to be rendered active
by means of which the grid is so formed that the material with which the holes therein
are to be filled is not liable to split or fall away. In one form the interstices in, the
grid in which the said material is to be placed are concave on their inner vertical or
horizontal faces. Or the said interstices in the grid produced has one concave and
one convex vertical or horizontal face.
In the first case the mould or chill which is used consists of halves with raised
projections where the interstices are to be in the cast grid the opposed projections
taking the form of a saw-tooth baving its vertical face convex to the amount of the
concavity required in the grid, and from the surface of the mould each projection is
sloped back to the base or second surface of the mould at an acute angle. The
halves of the mould being similar, the two angles last mentioned fit together and when
the grid is cast it is only necessary to slide the halves of the mould on the angular.
second surface above mentioned in withdrawing it. The resulting grid or plate will
have two of the inner faces of each interstice concave.
For the production of convex and concave or equivalent formations on opposite
faces of each of the interstices of the grid or plate the mould or chill is so constructed
that each of its two halves bas raised projections where the interstice is to be
in the cast grid, the section of such projection being of rhomboidal form so that the
slope on one side of the vertical or horizontal face should produce a gutterlike
casting.
Dated this 19th day of June 1889
COMPLETE SPECIFICATION.
:
Improvements in Grids or Containers for the Elements or Plates of
Secondary Batteries, and Moulds to be used in their Manufacture.
We THE ELECTRICAL POWER STORAGE COMPANY Limited of 4 Great Winchester
Street in the City of London and PERCY JAMES REA of the same place Electrical.
Engineer 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 :-
According to this Invention a mould or chill is provided for the casting of secondary'
battery element grids or containers for the active material or material to be rendered.
active by means of which the grid is so formed that the material with which the
holes therein are to be filled is not liable to split or fall away. In one form the
interstices in the grid in which the said material is to be placed are concave on their
inner vertical or horizontal faces. Or the said interstices in the grid produced has
one concave and one convex vertical or horizontal face.
In the first case the mould or chill which is used consists of halves with projections
where the interstices are to be in the cast grid the opposed projections in some cases.
taking the form of saw teeth having each a vertical face formed with a convexity

page_text: corresponding to the amount of the concavity required in the interstices of
the grid, and from the surface of the mould each projection is sloped back to
the base or second surface of the mould at an acute angle. The halves of the
mould, being similar, the two angles last mentioned fit together, and when the
grid is cast it is only necessary to slide the halves of the mould on the angular
second surface above mentioned in withdrawing it. The resulting grid or plate
will have two of the inner faces of each interstice concave.
For the production of convex and concave or equivalent formations on opposite
faces of each of the interstices of the grid or plate the mould or chill is so
constructed that each of its halves has projections where the interstices are to be
in the cast grid, the section of such projections being of rhomboidal or equivalent
form, so that the slope on one side of the vertical or horizontal face should produce
a gutterlike casting.
And in order that this Invention may be fully understood we shall now proceed
more particularly to describe the same and for that purpose shall refer to the several
Figures on the annexed drawings the same letters of reference indicating corresponding
parts in all the figures.
Figure 1 represents in plan a grid constructed according to this invention with
interstices or spaces (for containing active material or material to be rendered active)
having the opposite vertical faces or walls concave and the other vertical faces having
projections cast thereon. Figure 2 is a longitudinal section of the grid along the
line 1, 2, Figure 1 and Figure 3 is a section at right angles to Figure 2 along the
line 3, 4 Figure 1. Figures 4 and 5 are sections at right angles to each other of
the mould or chills for casting the grid represented in Figure 1. Figures 6, 7 and 8
are views similar to Figures 1, 2 and 3 illustrating a grid having in one direction
half round or semi circular bars in cross section, and at right angles thereto bars of a
rhomboidal section.
Figures 9 and 10 are sectional views of the mould or chills for casting this grid.
Figures 11, 12 and 13 are views similar to Figures 1, 2 and 3 of another form of
grid having bars in one direction of an elliptic form in transverse section the bars at
right angles thereto being of a triangular form in section, one side of the triangle
being concave or inwardly angled as shewn in Figure 12.
Figures 14 and 15 are sectional views of the mould or chills for casting this grid.
Referring to Figures 1, 2 and 3 the bars A of the grid are recessed or concave on
the two vertical walls or sides as shewn at a Figure 2 and the bars B which are at
right angles to the bars A have projections cast on their two vertical walls or faces as
shewn at b in Figures 1 and 3 so that the spaces or interstices C formed by the bars A
and B have two opposite walls or faces concave or recessed as shewn at a Figure 1,
the other two opposing faces of each space having the projections b. The active
material placed in the interstices C enter the concavities a and the projections bare
embedded in the said material which material is thus securely held in position and
prevented from falling away if it contracts. These grids are cast in moulds or
chills D D¹ each being provided with projections d d¹ and each of these projections
have a convex face e corresponding to the concave face to be formed on the bars A of
the grid, and recesses f as shewn in Figure 5 corresponding to the projections b on
the bars B of the grid. The meeting faces of the two parts D D₁ of the mould or
chills are at an angle to the horizontal plane of the mould as shewn at g Figure 4 so
as to admit of the two parts D D¹ of the mould being readily separated (when the
cast grid is therein) by sliding or raising the one part D in an angular direction from
the other part D¹.
For casting grids with half round or semi circular bars A and rhomboidal bars B,
as shown in Figures 6, 7, and 8 the meeting faces of the two parts D D¹ of the
mould or chills are in the centre of the depth of the grid as shewn at g in Figures 9
and 10 the recesses and projections of the two parts of the mould being similar and
each corresponding to one half of the depth of the grid Figures 6, 7 and 8. To
remove the cast grid from the mould the upper part D thereof may be raised in a
vertical direction.

page_text: The mould or chills for casting the grid having bars of the form illustrated by
Figures 11, 12 and 13, consists of two parts D D Figures 14 and 15 each being
similar in construction to conform to the upper and lower parts of the grid, the
meeting faces g of the two parts being at the centre of the vertical depth of the grid
as in the herein before last described arrangement but in order to remove the grid
from the mould it is necessary (owing to the recessed or inwardly angled form of the
bars A at a) to raise the part D of the mould from the part D¹ in an angular direction
corresponding to the angle at a.
By constructing grids with bars of the form substantially as herein before described
and illustrated, the active material placed in the interstices or spaces C is effectually
retained therein by engaging in the recesses or concavities and by being engaged by
the projections on the bars and consequently the durability of the plates is considerably
increased.
Having now particularly described and ascertained the nature of this Inven-
tion and in what manner the same is to be performed we declare that what we
claim is.
First Grids for the elements or plates of secondary batteries having bars of a
sectional form substantially as herein before described and illustrated by Figures 1,
2 and 3 Figures 6, 7 and 8 and Figures 11, 12 and 13 of the accompanying
drawings.
Second Moulds or chills for casting grids for the elements or plates of secondary
batteries substantially as herein before described and illustrated by Figures 4 and 5,
Figures 9 and 10 and Figures 14 and 15 of the accompanying drawings.
Dated this 12th day of March 1890.
J. H. JOHNSON & Co.,
Agents.