Improvements in Electrical Accumulators.
Year: 1899

page_text: Date of Application, 6th Nov., 1899
Complete Specification Left, 7th Aug., 1900-Accepted, 6th Oct., 1900
Improvements in Electrical Accumulators.
I, EDWARD CECIL HYDER TRAVERS LUGARD, Electrical Engineer, of 97, Sinclair
Road, Kensington, do hereby declare the nature of this invention to be as
tollows
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My invention for the improvement of electrical accumulators of the Plante
type applies to that form of plate known as the "strip or "gud iron type
The object aimed at 18 to have horizontal bars of small section supported by
strengthening pieces of laiger section, these strengthening pieces may form the
outside frame of the plate & may be augmented by others either vertical horizontal
oi diaginal.
These strengthening pieces or bars being of comparatively large section offer
a plain surface of considerable area, with the result that these plain surfaces being
peroxidised have a tendency to scale in consequence of such plain surfaces afford-
ing no kev to retain the peroxide formed The peroxide sealing in this way causes
a loss of active material & liability to short circuit
In order to obviate this difficulty I make my plate in such a way that the hori-
zontal strips of small section intersect at the surface the strengthening bars of
larger section, thereby breaking up the plain surface otherwise exposed by the
strengthening bars, & affording a key for the peroxide formed upon the strengthen-
ing bars themselves
This 18 done by making the horizontal bats of uniform thickness throughout
then length & making the strengthening bais of any suitable width but of less
thickness than the horizontal strips
In using the term thickness I refer to the dimension of the strips & bars taken
at right angles to the face of the plate
11.
1
1000
I, EDWARD CECIL HYDER TRAVERS LUGARD, late of 97, Sinclair Road, Kensington,
in the County of Middlesex, and now of the Parkfield Works, Stockton-on-Tees,
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 electrical accumulators of the Planté type, and has
special reference to that form of plate known as the strip or grid on type,
P Rd 1

page_text: Hitherto the plate has been made up of horizontal bais of small section supported
by strengthening pieces of large section. these strengthening pieces form the
outside frame of the plate and may be augmented by others either vertical, hori-
zontal o diagonal These strengthening pieces or bars being of comparatively
large section offer a plain surface of considerable area, with the result that these
plain surfaces being peroxidised have a tendency to scale in consequence of such
plain surfaces affording no key to retain the peroxide formed The peroxide
scaling in this way causes a loss of active material, and where the scale peels off
in flakes, each flake is liable to fall over into contact with the opposite plate
which causes short circuiting
The object of my invention is to obviate this difficulty by making the plate
in such a way that the horizontal strips of small section intersect at the surface
the strengthening bars of larger section thereby breaking up the plain surface
otherwise exposed by the strengthening bars and affording a Ley for the peroxide
formed upon the strengthening bars themselves
And in order that my invention may be clearly understood and readily carried
into effect, I will proceed to describe the same with reference to the accompanying
drawing, in which Fig. 1 is a plan view of a strip type or grid iron plate con-
structed in accordance with my invention, and Fig 2 is an exaggerated transverse
sectional view taken on line rr of Fig 1.
In the drawing, a represents the horizontal bars which are made up of uniform
thickness throughout their length, and represents the strengthening bars forming
the outside frame of the plate, supplemented where necessary by horizontal
strengthening bars 61 and vertical strengthening bars 62, or if desired diagonal
bars may be used These hais bb are made of any suitable width but of less
thickness than the horizontal strips a In using the term "thickness," I refer
to the dimension of the strips a and bars b taken at 1ight angles to the face of the
plate, as shown more particularly in Fig. 2 Bv making the plate in this way a
key or mechanical interlock is provided by cariving ridges a¹ across the strengthen-
ing bars which have hitherto been flat, the said ridges being continuations of
the small horizontal bars a forming the grid The recesses formed between these
ridges a¹ constitute the kev for interlocking the peroxide coating formed upon
the strengthening bars themselves
By my invention the peroxide being interlocked 18 less liable to scale on the
strengthening bars, thus preventing loss of active material, and in this case the
scale, if any, would be too small to fall over into contact with the opposite
plate and would consequently fall to the bottom, thus preventing liability to
short circuit
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 electrical accumulators of the kind hereinbefore referred to, the improve-
ment effected in the construction of the plates in which a key is provided for inter-
locking the peroxide coating formed on the strengthening bars themselves the
said key consisting of ridges carried across the strengthening bars which have
hitherto been flat, substantially as and for the purpose herein before described with
reference to the accompanying drawing
GJ CLARKSON,
Chartered Patent Agent. Stockton-on-Tees, and Hull,
Agent for the Applicant.