Secondary Batteries or Electrical Accumulators.
Year: 1887

page_text: Date of Application, 20th Aug.. 1887-
Complete Left, 22nd May, 1888
Complete Accepted, 22nd June, 1888
Secondary Batteries or Electrical Accumulators.
I, JAMES SHANNAN STEVENSON of Jarrow Chemical Works, South Shields in the
County of Durham, Electrical Engineer do hereby declare the nature of this invention
to be as follows:-
My Invention relates to the manufacture of plates wherein the lead or alloy of
lead support or framing is cast around the active material and my said Invention
has for its object to effect the said casting in such a manner that the process is
greatly expedited and the liability to the disintegration of the active material and the
formation of imperfect castings is obviated or practically so.
According to my Invention I interpose between the active material and the face of
the mould a material which whilst capable of withstanding the heat of the casting
process is preferably a comparatively slow conductor of heat and is of a yielding
character so that when the parts of the mould are forced together the active material
is retained in place in the mould without fracturing or disintegrating the said
material. The following is a description of a mould constructed according to my
invention although it is to be understood that I do not confine myself to the precise
details hereinafter given.
I form the mould of two plates of iron or other suitable material and I interpose
between these plates liners or edge pieces to form sides or edges to the plate. These
liners are in height about the same as the thickness of the piece or pieces of active
material to be cast in the plate. I take one of the plates and I place upon it a sheet
of material or combination of materials of the aforesaid character and upon this I
place the pieces of active material at distances apart corresponding to those which
they are to occupy in the finished plate. The sheet of yielding material which is
applied to the mould face may be marked with guides for the proper placement of
the said pieces, I then place the liners or edge pieces in position and then I cover all

page_text: with another layer of yielding material of the aforesaid properties and I place on the
top mould plate or cover and I clamp or screw them all firmly together the yielding
material allowing this to be done without danger of breaking the pieces of active.
material. I then pour in at one end the moulten lead or the like which flows into the
spaces between the pieces of active material and forms in combination therewith the
plate. 1 prefer to mount the mould on trunnions so that it can be turned into a
horizontal position whilst the pieces of active material are being put in place and into
a vertical or angular position for casting in the lead or the like.
Dated this 20th day of August 1887.
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, W.C.,
Agents.

page_text: Secondary Batteries or Electrical Accumulators.
I JAMES SHANNAN STEVENSON of Jarrow Chemical Works South Shields in the
County of Durham, 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 :-
My Invention relates to the manufacture of plates for secondary batteries or electric
accumulators wherein the support or framing of lead or alloy of lead is cast around
the active material and my said invention has for its object to effect the said casting
in such a manner that the process is greatly expedited and the liability to the
disintegration of the active material and the formation of imperfect castings is obviated
or practically so.
According to my invention 1 interpose between the active material and the face of
the mould a material which whilst capable of withstanding the heat of the casting
process is preferably a comparatively slow conductor of heat and is of a yielding
Character so that when the parts of the mould are forced together the active material
is retained in place in the mould without fracturing or disintegrating the said material
paper, asbestos, felt or cloth are suitable for the said interposed material.
following is a description of the mould constructed according to my invention
although it is to be understood that I do not confine myself to the precise details
hereinafter described and illustrated.
The
Figure 1 is a side elevation, Figure 2 is a plan and Figure 3 is a transverse section
on the line A B Figure 1.
I form the mould of two plates (C and D) of iron or other suitable material and I
nterpose between these plates liners or edge pieces f to form sides or edges to the
late. These liners are in height about the same as the thickness of the piece or
ieces of active material g to be cast in the plate and they may be provided with
andles as at f' to enable them to be removed for heating them preferably by placing
hem in heated alloy I take the plate D and I place upon it a sheet of material or
ombination of materials of the aforesaid character (shewn at h) and upon this I
lace (in any suitable manner) the pieces of active material g at distances apart
orresponding to those which they are to occupy in the finished plate. The sheet of
ielding material which is applied to the mould face may be marked with guide
harks for the proper placement of the said pieces of active material and liners or edge
ieces in position and then I cover all with another layer of yielding material 2 of
he aforesaid properties and I place on the top mould plate or cover C and I clamp
r screw them all firmly together with the necessary amount of pressure (for example
screw clamps as shewn at i) the yielding material allowing this to be done without

page_text: danger of breaking the pieces of active material I then pour in at one end the monten
lead or the like which flows into the spaces between the pieces of active material and
forms in combination therewith the plate.
I prefer to mount tho mould on trunnions so that it can be turned into a horizontal
position whilst the pieces of active material are being put in place and into a
vertical or angular position for casting in the lead or the like. For this purpose the
drawing shews the mould as being provided with trunnions & resting in slots in
standards 1. A slotted quadrant m fixed to the plate D moves over a screwed pin at n
and the mould can be adjusted to any desired angle and fixed therein by the screw
nut and handle n². p are pins and are slots on the plates C and D for keeping
them in proper relative positions, r is a handle for tilting the mould.
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:
In the manufacture of elements or plates for secondary batteries or electric
accumulators casting the support or frame around the active material in moulds with
the intervention of yielding material between the said active material and the faces of
the mould substantially as hereinbefore described.