Improvements in, and relating to Secondary Electric Batteries or Accumulators.
Year: 1897

page_text: Date of Application, 22nd Sep., 1897
Complete Specification Left, 11th Oct., 1897-Accepted, 11th Dec., 1897
PROVISIONAL SPECIFICATION.
Improvements in, and relating to 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:-
My invention relates to certain improvements in and relating to secondary electric
batteries or accumulators, and has for its object the production of an improved
envelope which may readily be adapted to any particular form of plate or electrode
with but a slight alteration of the structure of the latter. The function of an
envelope is, in secondary, or accumulator cells, to enable these to be arranged in a
smaller compass, with perfect individual insulation, and yet possessing freedom for
the requisite electro-lytic action by porosity or perforation. The envelope herein
described is simple in structure and may be attached to, and removed from the
ectrode to which it is adapted with facility.
The
In order that my said invention may be the better understood I have appended
the accompanying sheet of drawings in which Figure 1 is a perspective view of the
envelope, open, and detached from the electrode or plate of the accumulator.
perforations for electrolysis are here for purposes of clearness drawn larger, and are
less numerous than would be the case in practice; Figure 2 is an elevation of a plate
or electrode in situ with part of the envelope removed. Figure 3 is a plan view of
the same. Similar letters of reference indicate corresponding parts in the several
views.
In carrying my invention into effect 1. employ a sheet of perforated ebonite,
vulcanite-celluloid or other like insulating material or substance which may be
pressed or formed by the application of moderate heat. This is shown by A
Figures 1-2-3, and is moulded so as to present an hinged end B₁ and opposite
edges B, B1, which are slotted at a, the slots on both leaves being coincident. A slot
at C allows the terminal extension D of the plate E to pass through as shown, and the
edges B B. being overlapped when the envelope is closed. The plate E is formed with
lugs & either forming an integral portion thereof, or attached thereto, and said lugs
are bored to admit a pin c shown by Figure 2 the opposite pin c¹ being shown
detached. When the envelope A is closed over the plate E the slots a engage with
the lugs b, as the edges B B overlap. Then the pins c formed preferably of
insulating material, are passed through the lugs b, firmly enclosing the envelope by
pressure against the edge of the plate and the intervening overlapping edges.
I may form upon or attach to any kind or type of electrode or plate lugs similar
to those shown by Figure 2, and for purposes of better adaptation of said envelope
may cause the hinge or closed edge to be at any angle or side other than the bottom,
as shown, suitable lugs b and pins c being provided at each or any of the open joints to
close the overlapping ends.
I do not confine myself to any special substance or material in constructing the
envelope, so that it possesses the properties of an insulator, and is capable of
manipulation by heat, and may be cut, stamped and folded without joining by means
of any of the volatile cements or the like in common use. Further the tool or tools

page_text: for stamping, cutting or forming may be varied to suit the conditions of various cases
of adaptation.
The essential feature of my said invention is the formation of the envelope and
the manner of its retention upon any type of plate by means of the pin c and lugs b
as herein before described.
Dated this 20th day of September 1807
FREDK. WALKER,
73 St Stephen's Road, Upton Park, London, E.
Agent for the Applicant.
Improvements in, and relating to Secondary Electric Batteries or
Accumulators.
I, SAMUEL WALTER HART, of Oakdene, South Woodford, in the County of Middlesex,
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, and relating to secondary batteries
or accumulators and has for its object the production of an improved envelope which
may be readily adapted to any particular form of plate or electrode with but a slight
alteration of the structure of the latter. The function of an envelope is, in secondary
or accumulator cells, to enable these to be arranged in a smaller compass with perfect
individual insulation, and yet possessing freedom for the requisite electrolytic action
by porosity or perforation. The envelope herein described is simple in structure and
may be attached to, and removed from the electrode to which it is adapted with
facility.
In order that my said invention may be the better understood I have appended a
sheet of drawings to my provisional specification, to which reference may be had, and
also a sheet accompanying the complete specification. Figure 1 is a perspective view
of the envelope, open, and detached from the electrode or plate of the accumulator.
The perforations for electrolysis are here for purposes of clearness drawn larger, and
are less numerous than would be the case in practice. Figure 2 is an elevation of a
plate or electrode in situ, with part of the envelope removed. Figure 3 is a plan
view of the same-In the sheet of drawings hereto appended Figure 4 shows a plate
as stamped out before folding or bending; Figure 5 is a transverse elevation of a
stamp or die for folding or bending the edges, and Figure 6 is an elevation of the
same, Figure 7 is a perspective view of part of an electrode, showing an alternative
method of constructing the lugs thereof. Similar letters of reference indicate
corresponding parts throughout the several views.
In carrying my invention into effect I employ a sheet of perforated ebonite,
vulcanite, celluloid, or other like insulating material or substance which may be
pressed or formed by the application of moderate heat. This is shown by A,
Figures 1, 2, 3, 4 and 5. and is moulded so as to present an hinged end B₁, and
opposite edges B B¹ which are slotted at a the slots on both leaves being coincident.
A slot at C allows the terminal extension D of the plate E to pass through as shown,
and the edges B. B₁ being overlapped when the envelope is closed. The plate E is
formed with lugs b, either forming an integral portion thereof or attached thereto,
and said lugs are bored to admit a pin c, shown by Figure 2, the opposite pin c¹ being
When the envelope A is closed over the plate E, the slots a engage
with the lugs b, as the edges B B¹ overlap. Then the pins c formed preferably of
shown detached.

page_text: insulating material are passed through said lugs b, thus firmly closing the envelope
by pressure against the edge of the plate, and the intervening overlapping edges.
I may form upon or attach to any kind or type of electrode or plate, lugs b similar
to those shown by Figure 2 and for purposes of better adaptation of said envelope,
may cause the hinge or closed edge to be at any angle or side other than the bottom
as shown, suitable lugs 6 and pins c being provided at each or any of the open joints
to close the overlapping ends.
Referring to Figure 4, the envelope A is shown as a sheet of material stamped or
cut into the required form. Figure 3 is a transverse elevation of a die or press, the
stainped sheet A lying in the upper recess of the matrix M, ready for the edges B. B¹
to be turned up upon the depression of the die N into said matrix. Referring to the
elevation Figure 6 it will be seen that the die N and matrix M are hinged at O, the
axis of said hinge being above the plane of contact. This method of connection
ensures an approximate degree of parallelism when the die is closed upon and into
the matrix, and affords greater facility in rapid manipulation. A handle H fixed to
a lug L upon the die N allows the requisite pressure for moulding to be applied by
hand.
Instead of forming the lugs b upon the electrodes or plates E, as a complete lug
with a central hole, I may form them as hooks, shown by Figure 7, these being
placed to face oppositely in alternate sequence.
I do not confine myself to any special substance or material in constructing the
envelope so that it possesses the properties of an insulator and is capable of
manipulation by moderate heat, and may be cut, stamped or folded without joining
by means of any of the volatile cements or the like in common use. Further the
tool or tools used for stamping cutting or forming may be varied to suit the
conditions of different cases of adaptation.
Having now particularly described and ascertained the nature of my said invention
and in what manner the same
is to be performed I declare that what I
claim is ;-
First. In secondary electric batteries or accumulators, the combination of a
perforated or porous insulating envelope, having bent slotted edges, with an electrode
or plate with lugs upon its edges, to carry a pin or pins for securing said envelope
substantially as herein described with reference to the appended drawings.
Second. In secondary electric batteries or accumulators the method of, and means
for constructing, forming and adapting a perforated or porous insulating envelope to
plates or electrodes substantially as herein described with reference to the appended
drawings.
FREDK. WALKER
73. St. Stephens Road Upton Park. London, E. Agent for the Applicant.

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