Year: 1886

page_text: Date of Application, 26th May, 1886.
Complete Left, 26th Feb., 1887.
Complete Accepted, 29th Mar., 1887.
RESER
I GEORGE FREDERICK. MARSHALL, of Church Road, Battersea, in the county of
Surrey, Manufacturer, do hereby declare the nature of this invention to be as
follows:-
This invention relates to improvements in water filters for domestic and table use
the main object of the improvements being to so construct or arrange the filter as to
effect an automatic aëration of the filtering medium each time the filter is supplied
with water.
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In carrying out my invention as applied to a table filter I employ an ordinary carbon
block, preferably of silicated carbon" which is contained within a suitable cell or case
open at the bottom and closed at the top; I find it advantageous that the carbon be
removeably connected to the cell by means of a plug of suitable material such as
glass which passes through a hole in the top of the cell or case into a hole in the
filtering medium which is provided with a packing of suitable elastic material such as
cork, a suitable elastic washer or packing being placed between the head of the plug
and the top of the cell or case to ensure a tight joint. The improved filter is applied
to the usual glass funnel in the ordinary manner.
By this arrangement it will be obvious that at each fresh supply of water the air
contained between the filtering medium and the cell will be forced by the pressure of
the water through the filtering medium which will thus be automatically aërated as
the water to be filtered passes through the same.
The application of my improvements to other kinds of domestic filters will be
obvious without further description.
The filtering medium can in some cases be fixed to the cell or case but I do not
advise this arrangement as the block cannot then be easily removed for cleansing
purposes or for renewal.
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L 11
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1002
G. F. REDFERN,
4, South Street, Finsbury, London.
Agent for the Applicant.

page_text: I GEORGE FREDERICK MARSHALL, of Church Road, Battersea, in the county of
Surrey, Manufacturer, do hereby declare the nature of this invention and in what
manner the same is to be perforined to be particularly described and ascertained in
and by the following statement :-
This invention relates to improvements in water filters for domestic and table use
the main object of the improvements being to so construct or arrange the filter as to
effect an automatic aeration of the filtering medium each time the filter is supplied
with water.
In carrying out my invention as applied to a table filter I employ an ordinary
carbon block, preferably of "silicated carbon" which is contained within a suitable
cell or case open at the bottom and closed at the top; I find it advantageous that the
carbon be removeably connected to the cell by means of a plug or screw of suitable
material such as glass which passes through a hole in the top of the cell or case into
a hole in the filtering medium which is provided with a packing of suitable elastic
material such as cork, a suitable elastic washer or packing being placed between the
head of the plug and the top of the cell or case to ensure a tight joint. The improved
filter is applied to the usual glass funnel in the ordinary manner.
The application of my improvements to other kinds of domestic filters will be
obvious without further description.
In order to enable my invention to be fully understood I will now proceed to
describe how the same can be carried into practice by reference to the accompanying
drawings in which figure 1 represents a vertical section of a table filter with my
improvements applied thereto and figure 2 a vertical section shewing my improve-
ments applied to a domestic filter.
In the table filter shewn in figure 1, a, represents the filtering medium consisting of
a carbon block preferably of silicated carbon and b, the cell or case for containing the
carbon block a. The cell or case, is open at the bottom and closed at the top as
shewn c, is the plug (or screw) of suitable material such as glass by which the carbon a,
is removeably connected to the cell, the said plug passing through a hole in the
top of the cell or case and into a hole in the filtering medium the said hole being
provided with a packing d, of suitable material such as cork; e, is the washer between
the head of the plug (or screw) c, and the top of the cell or case b, for ensuring a
tight joint; f, is a packing ring of asbestos or other suitable material placed between
the filtering medium and the lower edge or rim of the cell or case b; g, is the usual
glass funnel to which the filter is applied in the ordinary manner.
By this arrangement it will be obvious that at each fresh supply of water the air
contained in the space h, between the filtering medium a, and the cell b, will be forced
by the pressure of the water through the filtering medium a, which will thus be
automatically aërated as the water to be filtered passes through the same.

page_text: In the arrangement shewn in figure 2, which represents a domestic filter the
filtering medium a, is removeably connected to the filter in the manner described in
the specification of my former Letters Patent No. 5310 dated 9th November 1883,
that is to say, by means of a screw threaded spindle i, but I now provide the upper
end of the said spindle with a screw threaded extension j, over which the hole in the
cell or case bis passed, a screw threaded cap k, being screwed on the extension;;
1,1,are lugs or projections on the cell or case b, by which it can be placed on and lifted
off the packing ring f, between the rim or flange on the lower end of the case b, and
the interior projection m, of the filter case. The action is the same as that described
by reference to figure 1.
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. Providing the filtering medium of filters with a cell or case, an air space being
left between the filtering medium and the cell or case so that at each fresh supply of
water the air contained in the said space will be forced by the pressure of the water
through the filtering medium substantially as and for the purpose described.
2. The improved filters hereinbefore described and represented in the accompanying
drawings.