Year: 1887

page_text: Date of Application, 7th July, 1887
Complete Left, 7th May, 1888
Complete Accepted, 8th June, 1888
1, PERCIVAL EVERITT, of No. 47, Cannon Street, in the City of London, Engineer,
do hereby declare the nature of this invention to be as follows:-
This invention relates to an improved construction of filter whereby a large filtering
surface is obtained and the filtering medium is easily renewable or can be removed
for the purpose of cleaning when necessary. The liquid to be filtered is in a state of
rest when the filter is not being used thus allowing the water to naturally deposit the
heavier substances thereby saving the work of the filtering material. The filter is of
such a shape and construction that the natural tendency of the water to be filtered is
to keep the surface of the filtering medium clean.
The general construction of my filter is as follows:-
I take an outer case of any suitable material and inside this case I place a cup or
vessel of suitable shape which may be composed entirely of carbon or any known
suitable filtering material or medium or I may take two thin perforated cups, one
within the other, within which may be placed the filtering material which then is
placed within the outside cup. The water to be filtered is placed in the outside cup and
filters from the outside to the inside of the filter. When the filter is first filled up the
outside compartment will be full and it will immediately commence to filter from all
parts to the inside cup or receiver of filtered water. As soon as the water in the
inside cup becomes level with the outside cup all filtration ceases, but the unfiltered
water in the outside cup is gradually depositing its residue on the bottom. I make a
connection either by a syphon or by a tap running from the outside through the
nonfiltered water to the inside whereby the filtered water is drawn off. As soon as
the filtered water commences to be drawn out, immediately the non-filtered water
commences to filter through the porous cup into the inside and it filters from the top
which water is the purest, the heavy matter having settled at the bottom.
1
1 L
CTL 1007
G. F. REDFERN,
4, South Street, Finsbury, London,
Agent for the Applicant

page_text: Improvements in Filters.
I, PERCIVAL EVERITT, of No. 47, Cannon Street, in the City of London, 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 —
This invention relates to an improved construction of filter whereby a large filtering
surface is obtained and the filtering medium is easily renewable or can be removed
for the purpose of cleaning when necessary. The liquid to be filtered is allowed to
deposit the heavier substances contained therein on a surface remote from the filtering
material thereby saving the work of the latter. The filter is of such a shape and
construction that the natural tendency of the water to be filtered is to keep the surface
of the filtering medium clean.
The general construction of my filter is as follows:-
Tho
I take an outer case of any suitable material and inside this case I place a cup or
vessel of suitable shapo which may be composed entirely of carbon or any known
suitable filtering material or medium or I may take two thin perforated cups, one
placed within the other, between which cups may be placed the filtering material,
the filtering cup or vessel so formed being then placed within the outside case.
water to he filtered is placed in the outside case and filters from the outside to the
inside of the filtering cup or vessel; a syphon or a pipe running from the outside
through the non-filtered water to the inside of the filtering cup or vessel is provided
whereby the filtered water is drawn off.
In order to enable my invention to be fully understood I will describe how it can
be carried into practice by reference to the accompanying drawing in which
Figure 1 is a vertical section of a filter constructed according to my invention, and
Figure 2 is a horizontal section of the same on line A B of figure 1.
Similar letters in both the figures indicate similar parts.
a is the outer case made of any suitable material. b and c are the two thin
perforated caps placed one within the other. d is the filtering material or medium
such as carbon which I place between the two cups b and c, the filtering cup or
vessel b, c, d thus constituted being placed and supported within the outer case a.
For this purpose the outer case a can conveniently be provided with brackets f, f and
the filtering cup or vessel be formed with a flange g adapted to rest on the
brackets, the water to be filtered being introduced into the case a through the space
between the flange g and the side of the said case.
e is the pipe for drawing off the filtered water from the interior of the filtering
cup or vessel b, c, d the said pipe being for this purpose led from the bottom of the
filtering cup or vessel through the non-filtered water to the outside of the case a where
it is provided with a tap h.
is the cover of the filter.

page_text: b
By this construction a supply of water to be filtered being introduced into the
outer case a the water will immediately commence to filter from all parts through the
filtering material & into the interior of the inner cup bor receiver of filtered water.
As soon as the water in the inner cup becomes level with that in the outside case a,
all filtration ceases but the unfiltered water in the outside case is gradually depositing
its residue on the bottom thereof. As soon as it is commenced to draw out the filtered
water through the tap h the non-filtered water commences to filter through the porous
cup or filtering vessel b, c into the inside of the cup b and it filters from the top part
where the water is the purest, the heavy matter having settled at the bottom of
the case a.
Upon unscrewing the nut which fixes the pipe e to the filtering cup or vessel the
latter can be easily removed from the outer case a to allow the filter to be cleaned;
the cups b and c can also be separated and the filtering material be renewed.
Instead of making the filtering cup or vessel in the manner hereinbefore described
and illustrated it can obviously be made entirely of carbon or other suitable filtering
material.
Also instead of drawing off the filtered water by means of the pipe e, any other
suitable means such as a syphon could be employed for the purpose.
.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. A filtering apparatus having in combination a vessel composed of a filtering
material as set forth and another vessel surrounding the same for holding unfiltered
water, the inner vessel, by reason of its porosity, receiving its supply from outside to
inside by the filtering of such water through the material composing it.
2. The improved filter herein before described and illustrated in the accompanying
drawing.
Dated the 7th day of May 1888.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London,
Agents for the Applicant.