Improvements in Secondary Electric Batteries or Accumulators.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in Secondary Electric Batteries or Accumulators.
I, SAMUEL WALTER HART, of Oakdene, South Woodford, in the County of
Essex, Gentleman, do hereby declare the nature of this invention to be as
follows:-
Sand
My invention relates to certain improvements in secondary electric batteries or
accumulators, and has for its object the construction of an improved grid or
cellular frame for holding the active material used in such apparatus.
improved grid is constructed to retain the maximum amount of active material,
presenting the greatest surface with the minimum amount of solid metal, the
structural strength being arranged to withstand buckling or distortion under
severe mechanical strains or those due to rapid electrolysis.
In order that my invention may be clearly understood, I have appended the
accompanying sheet of drawings, in which Figure 1 is a front elevation, and
Figure 2 is a sectional elevation of a plate or electrode. Figure 3 is a sectional
view of the same before the pressing and immediately after casting.
In carrying my invention into effect I prefer to cast the plates or electrodes in
a chill or metal mould, so as to preserve a sharp outline in impression, and,
referring to, Figures 1 and 2 of the accompanying drawings, I form an alternate
series of open cells a made up of transverse members b and diagonal members c,
intersecting, so that an open cellular space d upon one surface alternates with a
grid or lattice e, upon the same surface, each cellular space d being the reverse
of a grid or lattice e upon the opposite surface. In the process of and after
casting the projections 1, Figure 3, are extending from the plate or electrode upon
each side, but by a second process of rolling or pressing these are caused to bend
inwards, forming claws or holders for the retention of the active material in the
same manner and according to the same method employed in holding or retaining
jewels or stones in ornaments. In the disposition of the active material it is
arranged so as to present an equal surface on both sides the cellular space on one
side being balanced by the open grid or lattice upon the other. The structure is
analogous to that of a trussed girder the strains the strains being diverted from
the weakest part as in plates or electrodes as ordinarily constructed and equally
distributed over the surface by the diagonal and transverse members.
I do not confine myself to any particular size of the cellular spaces, grids, or
ribs forming the electrode or plate, nor the degree of intersection of the angles
thereof, the essential features being in the alternate cellular structure, and the
claws or holders formed by pressing inwards a projecting portion or portions
of said plate or electrode, as hereinbefore described.
Dated this 20th "dar of Sentember 1897
FREDK. WALKER,
73 St. Stephen's Road, Upton Park, London, E.,
Agent for the Applicant

page_text: 1
Improvements in Secondary Electric Batteries or Accumulators.
I, SAMUEL WALTER HART, of Oakdene, South Woodford, in the County of
Essex, Gentleman, 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: —
My invention relates to certain improvements in secondary electric batteries or
accumulators, and has for its object the construction of an improved grid or
cellular frame for holding the active material used in such apparatus. Said
improved grid is constructed to retain the maximum amount of active material,
presenting the greatest surface with the minimum amount of solid metal, the
structural strength being arranged to withstand buckling or distortion under
severe mechanical strains or those due to rapid electrolysis.
In order that my invention may be clearly rendered, I have appended to my
Provisional Specification a sheet of drawings, in which Figure 1 is a front
elevation, and Figure 2 is a sectional elevation of a plate or electrode. Figure 3
is a sectional view of the same before the pressing and immediately after casting,
and have also added to my Complete Specification a sheet of drawings in which
Figur is a transverse section of the chill or mould in which the plates are cast.
Simil: a letters of reference indicate corresponding parts through the several views.
In rying my invention into effect I prefer to cast the plates or electrodes in
a chi or metal mould, so as to preserve a sharp outline in impression, and,
referr n to Figures 1 and 2 of the accompanying drawings, I form an alternate
series of open cells a made up of transverse members and diagonal members c,
intersecting, so that an open cellular space d upon one surface alternates with a
grid or lattice e, upon the same surface, each cellular space d being the reverse
of a grid or lattice e upon the opposite surface. In the process of and after
casting the projections, Figure 3, are extending from the plate or electrode 'upon
each side, but by a second process of rolling or pressing these are caused to bend
inwards, forming claws or holders for the retention of the active material in the
same manner and according to the same method employed in holding or retaining
jewels or stones in ornaments. In the disposition of the active material it is
arranged so as to present an equal surface on both sides the cellular space on one
side being balanced by the open grid or lattice upon the other. The structure is
analogous to that of a trussed girder the strains being diverted from the weakest
part as in plates or electrodes as ordinarily constructed and equally distributed
over the surface by the diagonal and transverse members.
The disposition of the metal when poured into the mould or chill is shown by
the sections Figure 4, which is a transverse section of said chill or mould, and the
projections in the position of casting are clearly shown.
I do not confine myself to any particular size of the cellular spaces, grids, or
ribs forming the electrode or plate, nor the degree of intersection of the angle
thereof, the essential features being in the alternate cellular structure, and the
claws or holders formed by pressing inwards a projecting portion or portions
of said plate or electrode, as herein before described.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be described, I declare that what I
claim is:-
First. In a secondary battery or accumulator the construction and use of a
id or holder for native matorial bovine an oltomato cellulos
latticed plato

page_text: ulators.
which are closed after casting by pressure substantially as herein described and
uragonal truss.bars intersected by lateral bars, and projections
shown by Figures 1, 2 and of the (accompanying drawings.
Second. In a secondary battery or accumulator the method of and means for
casting, forming and pressing the latticed plate, grid or holder as referred to in
the preceding claim substantially as herein described with reference to the appended
drawings.
Third. A latticed plate, grid, or holder for the active material used in secondary
batteries or accumulators having a series of projections left after the operation
of casting, and subsequently pressed inwards by a second operation of pressure,
substantially as herein described and shown.
Dated this 13th day of Ootal
FREDK. WALKER,
73 St. Stephen's Road, Upton Park, London, E.,
Agent for the Applicant.