Improvements relating to the Manufacture of Plates for Electric ! Accumulators.
Year: 1897

page_text: Date of Application, 28th Aug., 1897-Accepted, 20th Nov.,
1897
'
COMPLETE SPECIFICATION.
Improvements relating to the Manufacture of Plates for Electric
! Accumulators.
I, LEOPOLD GUELZOW, of 45 Prince George Road, Stoke Newington, London,
N., 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 electric accumulators,
and has for its object to simplify the manufacture, shorten the time of formation,
reduce the weight and increase the receptiveness and durability of such plates.
A plate constructed according to my aforesaid invention comprises a two-part
frame of asbestos or other light insulating material capable of withstanding acid,
a lead plate furnished with horizontal slots and lips and adapted to retain on
either side a paste constituting the active material and consisting substantially
of minium, litharge, potassium acetate and sulphuric acid in varying proportions
according as the plate is positive or negative.
Referring to the accompanying drawing,
Figure 1 is a side elevation,
Figure 2 a horizontal section on the line - of Figure 1, and
Figure 3 is a vertical section on the line yy, of Figure 1, of the frame.
Figure 4 illustrates a side elevation of the lead core, and
Figure 5 is a vertical section on the line z-z of Figure 4, representing the lead
core furnished with the active material.
At
In carrying my said invention into practice I use a frame A (Figures 1, 2 and 3)
consisting of asbestos or other suitable insulating material which is light and can
resist the action of acid. This frame is in two parts ab, the division (Figures 2
and 3) being parallel with its sides, for enabling it to be readily moulded.
certain intervals the lateral and central. bars of the frame A present projections d
the adjacent frames, without
adapted to bear against similar projections on
interposition of insulating material, when such frames are placed side by side to
form a cell or battery. Holes e made in the sides of the frame and serving for
the passage of the acid communicate with the space ƒ designed for the reception
of the lead core B provided with paste which constitutes the active material C
(Figures 4 and 5).
As shown, this lead core B, to which the active material C is applied, consists
of a thin plate furnished at short distances apart with horizontal slots g which
extend nearly over the whole width of such core and present corresponding lips h
produced by bending their upper edges to one side and their lower edges to the
other side of the core, with the object of affording the active material Ca secure
hold so as to preclude the sagging of the same (Figure 5). It is expedient to
roughen the two sides of this core B in order to provide for the proper adhesion of
the active material. At the top of the core the terminal i is secured by soldering
or otherwise. I prefer to make such a lead core B by stamping, and to apply the

page_text: active material thereto by pressure exerted with the aid of any suitable mechanical
means, the material being then dried.
This active material covering the sides and filling up the slots of the plates B
held in the space f of the frame A consists of minium and litharge, combined with
a solution of potassium acetate CH3COOK in distilled water, and dilute sulphuric
acid H₂SO, whereby the lead oxides are formed into a doughy paste. In the
active material for the positive plates the minium predominates, whereas the
litharge predominates in the active material for the negative plates. An extremely
short time is required for the formation, and very considerable hardness is imparted to
the active material, as by the chemical combination of CH,COOK+PbO+H₂SO
neutral lead acetate (C2H3O2),Pb will be produced and potassium separated.
Having now particularly described and ascertained the nature of the said in-
vention and in what manner the same is to be performed I declare that what I
claim is:-
First. A plate for electric accumulators consisting of a frame A of asbestos or
other insulating material capable of withstanding acid, divided parallel with its
sides into two parts a band provided at its lateral and central bars with projec-
tions d; a lead core B inserted into the space f of the frame and having horizontal
slots 9 with lips bent to one side or the other for preventing the sagging of the
active material C, substantially as and for the purposes set forth.
Second. A plate for electric accumulators, in which minium and litharge
forming the active material are chemically combined by potassium acetate and
sulphuric acid, substantially as set forth.
Dated this 28th day of August 1897.
CHARLES JUNGE,
Agent for the Applicant.