Year: 1899

page_text: Date of Application (in United Kingdom), 2nd June, 1899
Complete Specification Left; 2nd Mar., 1900-Accepted, 2nd June, 1900
We, LA SOCIÉTÉ CH. PREVET ET CIE, of 30, Rue du Faubourg Poissonnière,
Paris, France, do hereby declare the nature of this invention to be as follows:-
L
This invention relates to a stationary or portable filter capable of filtering as
rapidly as though the filter was directly connected to a pipe supplying water or
other liquid under pressure.
The invention has for its object to provide a receiver under pressure for the
water or other liquid and means of putting the same under pressure. At the
lower part of said receiver is arranged the filter proper and at the upper part
there is a valve controlled inlet for the attachment of a tube connected to an
air pump for compressing air or any suitable gas into the space above the liquid
in the receiver. The compressed air exerting a pressure upon the liquid, the filter-
ing action will be accelerated proportionately to the degree of compression of
the air.
The accompanying drawings illustrate a filter constructed in accordance with
this invention. Figure 1 shews the filter in vertical section; Figure 2 is a
horizontal section thereof.
n is a receiver into which the water to be filtered is supplied through a tube b
provided with a funnel mouth c and closed by a screw plug or stopper d. Towards
the upper part of the receiver is a small air inlet valve e closed by a cap f. The
filter proper is situated near the bottom of the receiver and is enclosed within
a casing in communication through a pipe g with the water capacity of the
receiver. The filter comprises a lens-shaped chambered disc of carbon and unsized
paper secured upon opposite sides of the said disc and the chambered disc is
provided with a delivery nozzle with which a draw-off cock j is connected.
In the filling operation, water is poured into the funnel until the mouth of
pipe b becomes sealed by immersion so that there remains a cushion of air con-
fined between the surface of the liquid and the upper part of the receiver. When
the apparatus is required to work, an air pump is connected to the inlet e and air
is pumped in and compressed in the receiver. In order to draw-off filtered water,
the draw-off cock j is opened and under the superincumbent pressure of the air
compressed into the receiver the water is forced rapidly through the filtering
medium and is delivered in a continuous flow.
Dated this 2nd day of June 1899
A. M. & WM. CLARK,
Chartered Patent Agents, 53, Chancery Lane, London.

page_text: Improvements in Filtering Apparatus.
We, LA SOCIÉTÉ CH. PREVET ET CIE, of 30, Rue du Faubourg Poissonnière,
Paris, France, 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:-
In ordinary filters the flow of filtered water is necessarily very slow, unless
the filter be directly connected to a pipe supplying water under pressure.
This invention has for its object to obviate this disadvantage and to render
the filtering action as rapid as it is when the filter is connected to a supply pipe
as last mentioned.
The invention will be described with reference to the accompanying drawing,
wherein Figure 1 represents a vertical section, and Figure 2 a horizontal section
of our improved filter.
The filter is entirely independent of any main or service pipe for the supply of
water under pressure and comprises a vessel a into which the water to be filtered
is supplied through a tube b provided with a funnel mouth c and closed by a screw
plug or stopper d. Towards the upper part of the receiver is a small air inlet
valve e closed by a cap f. The filter proper is situated near the bottom of the
receiver and is enclosed within a casing in communication through a pipe g
with the water capacity of the receiver, and provided with a lenticular filtering
disc and a delivery nozzle with which a draw-off cock j is connected.
In the filling operation, water is poured into. the funnel e until the mouth of
pipe becomes sealed by immersion so that there remains a cushion of air
confined between the surface of the liquid and the upper part of the receiver.
When the apparatus is to be put into condition to work, an air pump is connected
to the inlet e and air is pumped in and compressed in the receiver. To draw off
the filtered water, cock is opened and under the superincumbent pressure of
the air compressed into the receiver the water is forced rapidly through the
filtering medium and is delivered in a continuous flow by cock j.
It should be understood that the forms details, accessories, materials and
dimensions of our improved filter may be varied without departing from the
principle of the invention.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, we declare that
we claim is:-
Filtering apparatus comprising a vessel or reservoir a having near its upper
part an inlet valve for air under pressure and near its lower part a filter device
consisting of a filtering medium enclosed within a casing provided with an
inlet tube g and draw-off cock, the construction being such that the water in the
vessel when under pressure will be forced through the tube g and filtering medium
and out from the draw-off cock when the latter is opened, substantially as described
and shewn in Figures 1 and 2 of the drawings.
Dated this 2nd day of March 1900.
A. M. & WM. CLARK,
Chartered Patent Agents, 53, Chancery Lane, London.