An Improved Pocket-filter.
Year: 1893

page_text: Date of Application, 1st July, 1893
Complete Specification Left, 29th Mar., 1894-Accepted, 12th May, 1894
An Improved Pocket-filter.
I, RUDOLF GRAF WESTPHALEN, of I, Nibelungenstrasse 13, Vienna, in the
Empire of Austria, Gentleman, do hereby declare the nature of this invention to be
as follows: —
This invention consists of an Improved Pocket-filter in which the filtering medium
employed (such as asbestos fibre) is placed loosely in the filter-box between two
perforated plates, and is, when subjected to pressure at one side, pressed against one
of these plates whilst the liquid to be filtered percolates through the filtering
medium owing to such pressure; at the same time the other perforated plate retains
any coarse solid impurities contained in the liquid, which impurities settle on the
said plate and are thus prevented from reaching the filtering medium.
One of the plates is connected to the bottom of the filter-box by suitable means
such as a bayonet joint and the other perforated plate is immovably secured to the
box or it may be loosely inserted therein and made fast at any required distance
from the lower plate. For this purpose the rim of this plate is bent upwards and
slit in some places, the sections thus formed acting as springs pressing against the
inner surface of the filter-box.
The improved filter is provided with a tube-attachment to receive the hose or
pipe through which passes the liquid to be purified.
To clean the filtering medium when required, the filter box is filled with pure
water (preferably hot) and the filtering medium is loosened by shaking the box.
In this manner the filtering medium is washed, the impurities being carried off with
the escaping water. This operation is continued until the escaping liquid runs off
clear.
1000
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
CUMILELE
An Improved Pocket-filter.
I, RUDOLF GRAF WESTPHALEN, of I, Nibelungenstrasse, 13, Vienna, in the
Empire of Austria, Gentleman, 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 of an Improved Pocket-filter in which the filtering medium
employed (such as asbestos fibre) is placed loosely in the filter-box between two
perforated plates, and is, when subjected to pressure at one side, pressed against
one of these plates whilst the liquid to be filtered percolates through the filtering
medium owing to such pressure; at the same time the other perforated plate retains
any coarse solid impurities contained in the liquid, which impurities settle on the
said plate and are thus prevented from reaching the filtering medium.
When it is required to clean the filter, the filter-box has simply to be slightly
inclined, whereby, if clean liquid is contained in the filter, the filtering material
will be made loose and cleaned.

page_text: The accompanying drawing represents a vertical section of a pocket-filter
constructed according to my invention.
As shown, the asbestos fibre a used as filtering material is placed in the box A
of the filter between two perforated plates c and d, the first of which forms the
bottom of the filter-box and is secured to the latter by suitable means such as
a bayonet joint the other perforated plate d being immovably secured to the box or
as shewn in the drawing it may be loosely inserted therein so that it can be shifted
up and down in the box and made fast at any required distance from the lower
plate c. For this purpose the rim of the plate d is bent upwards at d¹ and slit in
some places as shewn, the sections thus formed acting as springs which press
against the inner surface of the filter-box.
The improved filter is provided with a tube-attachment screwed or otherwise
secured to the box A and serving to receive the hose or pipe through which passes
the liquid to be purified.
The liquid to be purified being admitted through the hose or pipe B, runs first
through the upper perforated plate d and falls into the space comprised between
the plates c and d, where it presses the filtering material a against the perforated
plate c, percolates through the filtering layer and escapes in a purified condition
from the box A.
To clean the filtering medium when required, the filter-box A is filled with pure
water (preferably hot) and the filtering medium is loosened by shaking the box.
In this manner the filtering medium is washed, the impurities being carried off.
with the escaping water. This operation is continued until the escaping liquid
runs off clear.
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 pocket-filter consisting essentially of a box into which fibrous filtering
material, preferably asbestos, is loosely inserted between two perforated plates with
the result that, on being subjected from one side to the pressure of the liquid to be
purified, this filtering material is pressed against one of the perforated plates and is
permeated by the liquid, whilst the other perforated plate retains the coarse solid
impuritics contained in the liquid to be filtered, substantially as hereinbefore
described and illustrated in the accompanying drawing.
2. The improved pocker-filter hereinbefore described and illustrated in the
accompanying drawing.
Dated the 20th day of March 1894
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.