Improvements in Secondary Batteries.
Year: 1892

page_text: Date of Application, 7th Oct., 1892
Complete Specification Left, 1st July, 1893-Accepted, 5th Aug., 1893
PROVISIONAL SPECIFICATION.
Improvements in Secondary Batteries.
We FRANK KING of 4 Great Winchester Street in the City of London and
EDWARD CLARK of West Ferry Road Millwall, London E. Electrical Engineers
do hereby declare the nature of our invention to be as follows:-
Our invention relates to an improved form of grid retainer or support for the
active material of secondary batteries.
According to our invention we prepare grids, retainers or supports, having per-
forations of any suitable form from the inner walls of each of which perforations
are pins or projections inclined at an angle to the surface of the plate and extending
towards the centre of the perforation so as to form claws to engage and retain in
position the active material which is placed in the perforations of the grid or
support.
By this means the perforations in the grid may be much larger than are those
usually employed in secondary battery plates whilst all the advantages of small
perforations are retained and the active material is securely held by the clawlike
arrangement of the pins or perforations so as to prevent it from falling away from
its support.
Dated this 7th day of October 1892.
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C., Agents.
COMPLETE SPECIFICATION.
Improvements in Secondary Batteries.
We FRANK KING of 4 Great Winchester Street in the City of London and
EDWARD CLARK of West Ferry Road, Millwall London E. Electrical Engineers
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:-
Our invention relates to an improved form of grid, retainer, or support, for the
active material of secondary batteries, wherein pins are employed projecting
from the body of the grid, retainer, or support, into the openings for the active
material.
According to our invention we prepare grids, retainers, or supports having
perforations, or interstices, of any suitable form but with pins, or projections,
protruding from the inner walls of the perforations, or interstices, and extending
inwards, or towards the centre of the perforations, or interstices, and curved round,
or inclined at an angle to the sides, or faces, of the grid, retainer, or support, so as
to form a claw-like arrangement to engage, and retain in position, the active
material which is placed in the perforations, or interstices, of the grid, retainer, or
support, without distortion of the plate by the expansion of the active material.
The pins, or projections, are in any suitable number but generally we prefer one
projecting from each side of the inner walls of the perforations, or interstices, the
said pins, or projections, being alternately reversely inclined, or curved towards
the face of the plate. The accompanying drawing shews in side view in Figure 1,
and in transverse section in Figure 2 a part of a grid, retainer, or support, con-
structed according to our invention. The pins, or projections, forming the claw-
like arrangement are shewn at a. We have shewn four-sided openings in the grid,

page_text: retainer, or support, and a pin, or projection from each side but there may be any
other number of sides and pins as desired.
By the means described the perforations, or interstices, in the grid, retainer, or
support, may be much larger than are those usually employed in secondary battery
grids retainers or supports whilst all the advantages of small perforations in
preventing the formation of large scales of sulphate from forming on the surface
are retained and the active material is securely held in position by the claw-like
arrangement of the pins, or projections, so as to prevent the said material from
falling away from its support whilst allowing it to expand without distorting the
plate, as would be the case if the pins, or projections, did not constitute the
reversely inclined, or curved, claw-like arrangement shewn and described.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is:
In, or for, secondary batteries, a grid, retainer, or support, having perforations,
or interstices, from the inner walls of which project pins, or projections, inclined, or
curved, reversely, so as to constitute a claw-like arrangement substantially as
and for the purposes hereinbefore described and shewn in the accompanying
drawings.
Dated this 20th or of Lun 1002
J. H. JOHNSON & Co.,
Agents.