Improvements in Plates for Accumulators.
Year: 1897

page_text: Date of Application, 20th May, 1897--Accepted, 14th Aug., 1897
Improvements in Plates for Accumulators.
I, Dr. WILHELM MAJERT of Grünau, near Berlin, in the Empire of Germany,
Chemist, 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 :-
In accumulator plates it is of importance that the mass should be firmly held but
without hindering expansion. The mass should always remain in continual and
intimate contact with the metal that conducts the electricity, and this contact should
not cease, neither during the expansion nor during the contraction of the mass.
Further it is desirable that there should be the greatest possible surface for contact
between the core and the mass without however covering the inass too much from
the electrolyte, whilst the weight should be as small as possible.
Now the construction of plates and gratings according to the present invention
fulfils these requirements by the fact that the ribs or grating walls are bent out in
the manner of corrugations either on one side only or on both sides, so that the rods
or bars remain straight in the centre and the corrugations have the form of spheres
or cones. The corrugations may also be alternately arranged on both sides so as to
be intermittent or alternating at top and bottom.
By means of this arrangement the surface of the active mass is not diminished and
a firm hold is afforded to the latter in the bevelled corrugations. The drawing shows
by way of examples this form of grating. Figures 1 to 6 show a series and
modifications in which the invention is carried into effect. Figures 1 and 2 being
modifications in form of plates made up of transverse bars while Figures 3 and 4 are
made up in a polyginal form of grating. Figure 5 is a perspective view corresponding
to Figure 1 while Figure 6 is a perspective view corresponding to Figure 2.
The frame a of the grating has either a full or hollow undercut or section and
in other respects of the usual construction. These transverse bars b I employ tc
divide the interior of the frame into correspondingly wide divisions. Transverse
bars b are corrugated either directly in the mould, or after casting by means of
special stamps, the arrangement being such that the corrugations of each two bar
form together one entire shape C. The corrugations decrease towards the centre ir
such a manner that the centre forms a straight line.
The spherical corrugations may also be employed with ribbed plates as well as with
through-gratings. The ribs of a plate of this kind then forin on the outside a
corrugated line, whilst they form a straight line at the base. The corrugations may
also be arranged alternately.
These corrugations may also be employed with a rectangular or polygonal form of
grating. In this case the corrugations are arranged opposite to each other as shown
at c and d in Figures 1 to 4. In this case also the rectangles and the polygonals may
be divided by means of a through partition as in the case of ribbed plates.
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;
1. Accumulator plates and grating characterised by the fact that without

page_text: diminishing the contact surface of the mass to be filled in, and for the purpose of
effecting an intimate and permanent contact, unaffected by contraction or expansion,
of the said mass with the ribs in walls of the plates or grating such ribs or walls are
provided either on one side only or on both sides with corrugations or bent out
portions of conical or spherical shape.
2. Improvements in Accumulators plates substantially as hereinbefore described
and as illustrated.
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents.