Improvements in Filters.
Year: 1895

page_text: Date of Application, 19th Feb., 1895-Accepted, 10th Aug.,
1895
Improvements in Filters.
I, JOHN NOEL CAREY, of Swan Hotel, Charlton, Kent, late Military Captain, 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 consists in improvements in filtering apparatus, ensuring absolute
and complete filtration, the removal of all impurities, and destruction of disease
germs.
My invention is based on a system of upward filtration; it is automatic in
action, simple in construction, and ensuring by the principle of its design as
hereinafter described, the absolute cleanliness of the filter bed at all times.
(1) The filters are specially adapted for hotels and offices, factories, stations etc.
(2) Mineral water manufactories, breweries etc.
In order that my invention may be clearly understood I have annexed to this
Specification a sheet of drawings, in which Figs. 1, 2, and 3 are sectional views of
three forms of filters constructed according to my invention.
The filter shewn in Fig. 1 comprises an outer vessel A, an inner vessel B, and a
filter plate C. The filtering medium D consists of animal charcoal, spongey iron,
or other material that may be considered desirable, through which all water must
pass into the chamber E from which it is then drawn off in a pure state by a tap F.
The outer vessel is supplied with unfiltered water, either by hand or by a ball-
cock, and can be drawn off for ordinary purposes from a tap G.
The centre plate J is constructed in such a manner as to form a trup for the
filtered water. The cylinder k contains a force pump, the action of which is
hereafter described. The cup I and cylinder K are secured to plate J by nuts or
screws H and are removable at will, thus allowing the filtering material to be
removed if considered desirable.
At L is fixed a torsional spiral spring to which an arm m is attached, to which
a lever n is added to give power. To said arm m is attached a rod ( which carries
a simple pump plunger with valve. By shipping the lever n and giving a
downward stroke the pump plunger is raised and the spring L placed in tension,
ou removal of the pressure from the lever, the filtered water below the plunger is
at once subjected to great pressure, forcing the water through the filtering medium
at a high velocity, carrying with it all impurities through the tap G which is
opened to allow of this escape, this tap at the same time cuts off the supply of
unfiltered water from A. This action can be repeated as often as desired till such
time as the filtered water arrives at a level with the head of the pump cylinder.
For further cleansing of the filter, boiling water can be poured into the
cylinder K and can be forced through the filter medium by another downward
stroke of the lever n.
Air can also be forced through in a similar manner.
Further by turning on tap Ġ the whole of the water above the pump cylinder
will flow back through the pump and filter bed escaping through the same tap.
If the tap G is left open for 2 or 3 hours or during the night, a constant current
of fresh air passes through the filter, thus further tending to sweeten and purify it,
at the same time a supply of filtered water is always available from the inner
vessel B.
Filtration re-commences at once on the closing of tap G.

page_text: The filter shewn in Fig. 2 differs from Fig. 1 in having one wessel B only, and
is fed by water at point P the supply being controlled by a ball-cock Q. In all
other respects the principle and construction are similar. The system of cleansing
is identical with that of Fig. 1, and the filtering material can be renewed if it is
considered desirable:
The filter shewn in Fig. 3 differs in construction from those of Figs. 1 and 2 in
having no reservoir in it for storing filtered water. It is designed for use when
large quantities of pure water are required, the water being led through a
pipe T to a flushing tank U and overflows at V into receivers placed in any
convenient position for its reception.
The cleansing process of this filter is similar in every respect to No. 2, but the
boiling water or air is supplied through tap W.
Further by opening tap G the filtered water in the flushing tank U flows back
through the pump to the filtering medium, escaping through tap G. On the
flushing tank becoming empty, the tap G may be left open when the purifying
action of the air is carried on as hereinbefore described.
Advantages claimed for this filter are:-
1. It is simple in construction and easily understood.
2. It works rapidly under low pressure of water.
3. It can easily and effectually be kept clean by three distinct methods, each of
which is automatic, viz.
Firstly. By the filtered water being drawn back through the filtering medium
by pressure of gravitation as desired.
Secondly. By the use of boiling water being driven through the filtering
medium, at a high pressure, thus destroying all baccili of whatever nature.
Thirdly. By aëration the air being forced through the filtering medium thus
reviving and purifying the filtering material.
4. There is no necessity for removing or renewing filtering material.
5. It will deal effectually with the foulest water.
6. It is cheap and occupies but little space.
7. Filtered water is always available even when the process of cleaning is
going on.
8. Continuous supply is assured and no choking can occur.
Having now particularly described and ascertained the nature of my inven-
tion and in what manner the same is to be performed I declare that what I
claim is―
CLAIMS.
1. In filtering apparatus the employment of a pump plunger or piston for the
purpose of forcing water or air through the filtering medium substantially as
hereinbefore described.
2. The general construction and arrangement of filters shown in Figures 1, 2
and 3 of the accompanying drawings substantially as hereinbefore described.
Dated this 19th day of February 1895.
HUGHES & YOUNG,
23 Coleman Street, London, E.C., Agents for Applicant.