AN IMPROVED APPARATUS FOR FILTERING LIQUIDS, APPLICABLE ALSO TO OTHER SIMILAR PURPOSES."
Year: 1877

page_text: LETTERS PATENT to Louis Sallien, of Brussels, in the Kingdom of Belgium,
65
Industrial, for the Invention of AN IMPROVED APPARATUS FOR FILTERING
LIQUIDS, APPLICABLE ALSO TO OTHER SIMILAR PURPOSES."
COMPLETE SPECIFICATION filed by the said Louis Sallien at the Office
of the Commissioners of Patents on the 24th October 1877.
<< AN
TO OTHER
LOUIS SALLIEN, of Brussels, in the Kingdom of Belgium, Industrial.
IMPROVED APPARATUS FOR FILTERING LIQUIDS, APPLICABLE ALSO
SIMILAR PURPOSES."
My Invention relates to an improved filtering apparatus, composed of a vessel A
(see Figure 1 of the Drawings), in the interior of which a funnel B distributes the
liquid to be filtered upon a strainer C, through which the liquid passes to the
lower part of the apparatus. I combine with the filter an air tube D, provided with
a cock or valve E.
The funnel B is supported by its upper edge F upon a rim G, formed by the
widening of the edge of the filter. To the bottom of the funnel B is attached by
means of lugs or stays H, H, a plate I, which may be flat or slightly convex, and
which thus distributes the liquor or liquid to be filtered gently and uniformly upon
the strainer C below. This strainer C is composed of wool or flannel, or other
similar material, and in some cases there may be placed over it a layer of paper
pulp, animal charcoal, or other substance or combination of substances suitable for
filtering through. This strainer is supported, by preference, by a tinned metal wire
frame or sieve, forming a circumference or form over which the flannel or woollen
material is secured, a handle J is provided for the purpose of facilitating the adjust-
ment or removal of the said fraine or sieve and strainer.
In filters of large size, cross bars, such as K, K, are provided, in order to support
the strainer. The extremities of such cross bars, being connected by a circular metal
wire L, are supported together with the sieve and strainer by an internal flange or
projection M, soldered all round inside the filter case A.

page_text: .
The lower part of the filter receives the filtered liquid which may be withdrawn
therefrom through the discharge valve or cock N.
The air tube D, before mentioned, extends from below the strainer and sieve to
the upper part of the filter, or opens into the air above the same, as shewn. The
effect of this air tube is to facilitate the filtration by affording an outlet for the
air which the liquid expels before it as it is filtered. This tube may be provided
with a valve of any suitable description with a cock E, as shewn in Figure 1, or
with a plain stopper as in Figure 2.
The process of filtration with this apparatus is carried out in the following
manner-The cock E is closed, the woollen or flannel strainer C secured to the
sieve is adjusted in place, so as to fit closely to the sides of the vessel A, the paper
pulp, animal charcoal, or other substance is then placed over the strainer, the funnel
put in place, and the liquid to be filtered being introduced by the conical part
thereof falls upon the plate I, whence it flows gently on to the filtering substance
and strainer C, where it remains until the cock E is opened, when the filtering
operation is allowed to take place by the escape of the air from below the strainer;
the presence of the said air below the strainer preventing the liquid from passing
through until the cock E is opened.
This Invention is also applicable to apparatus employed for making infusions of
coffee, tea, or other substances.
Figure 2 shews it applied as a coffee or tea pot.
Similar letters refer to like parts in both Figures 1 and 2.
The ground coffee, tea, or other substance of which it is desired to make an
infusion is placed upon the strainer C, the plug E being in place in the end of the
spout O. Boiling water is then poured into the upper part of the pot or filter, and
the whole allowed to stand the necessary time to effect the required concentration,
the plug E is then withdrawn (or the cock, if such be used, opened) and the infusion
immediately filters into the lower portion of the case A (the air escaping therefrom
by the tube D), and it is withdrawn by the spout O as required. In some
cases, and especially in small apparatus of this description, the funnel may be
dispensed with, and when necessary the cup P with a perforated bottom substituted
therefor.
These apparatuses are by preference provided with a cover, and made of cylindrical
form, and the bottom may be adapted to fit into a fixed or moveable base.
Having now described the nature of the said Invention, and the manner in which
the same is to or may be performed, I would have it understood that what I claim
as my Invention is, the filtering apparatus composed of the vessel A, funnel B, or
perforated cup P, woollen or flannel strainer C, and air tube D, with the valve,
cock, or plug E, such parts being arranged, combined, adapted, and applied, sub-
stantially as herein-before described, and illustrated in the Drawings, and for the
purposes set forth.
In witness whereof, I, the said Louis Sallien, have hereunto set my hand
and seal, this Twenty-fourth day of October, in the year of our Lord One
thousand eight hundred and seventy-seven.