Improvements in Filters.
Year: 1889

page_text: Date of Application. 24th June, 188-Accepted, 24th Aug., 1889
Improvements in Filters.
We, THEODOR GENTZEN and ALBERT WEGENER, both of 130 Oranienstrasse,
Berlin S. W., German Empire Gentlemen, do hereby declare the nature of this inven-
tion and in what manner the same is to be perforined, to be particularly described
and ascertained in and by the following statement:―
Our invention consists in an improved filter of which the following is an exact
description.
In order to make the description more clear we refer to the accompanying drawing
which forms part of this specification and in which similar letters denote similar parta
throughout the several views.
Fig. 1 is a vertical section through the filter.
Fig. 2 is a cross section along the line a ẞ in Fig. 1.
The improved filter consists of the cylindrical middle piece a in the middle of which
is attached the cock d having pipe e. The cylinder has flanges on each end to which
are attached the top and bottom covers band c. A flange S is cast on each end of
the cylindrical part, shown in dotted lines in Fig. 1, by means of which the filter may
be attached to the wall in any convenient place. Between the cylinder and each of
its ends is an india-rubber diaphragme N and Q with a hole in the middle. To the
lower of these diaphragmes are attached two metal rings O and 0, the upper of these
two metal rings forms a case in which small pieces of coal L are placed. These pieces
of coal L are kept from falling out, by a fine wire sieve K which is held on ring O by
means of a thin metal cap J and underneath is a layer of asbestus M lying above the
india rubber diaphragme N and underneath the ring O and held in place by the five
screws P P which hold the two rings on to the india-rubber diaphragme N. Both the
india-rubber diaphragmes are held in place by the screws which hold the two ends b c
of the filter on to the cylinder a. g is the water inlet, H the outlet. The whole of
the cylinder is filled with fine sand fup to the upper diaphragme Q.
The water passes now through the inlet g, then through the sand f, sieve K,
coal L, asbestus M and out at H. The cock d is for letting off the impurities
which are eliminated from the water and remain in the sand. When it is used
the water should be let into the filter and the cock d opened when any impurities
The cock d has a piece
will be driven through it by the pressure of the water.
of fine wire gauze over the part, which is screwed into the filter to prevent the
sand from flowing out with the water when the filter is being "scummed."
A filter of this kind filters the water most thoroughly and effectually and goes for
three to four years without any further attention than occasionally being scumined.
Having now particularly described and ascertained the nature of our said Inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is:
In filters:
1.) The combination of sand, coal and asbestus, in the manner and for the purpose
substantially as described.
2.) The combination of cylindrical piece a, covers b and c, india rubber diaphragme Q,
and diaphragme N having metal rings O and O¹, sieve K and cap J, coal L and layer
of asbestus M, in the manner and for the purpose substantially as described.

page_text: 3.) The combination of diaphragmes Q and N, coal L, sieve K, asbestus M and
sand with the cock d, in the manner and for the purpose substantially as described.
Dated this 20th day of June 1889
THEODOR GENTZEN and
ALBERT WEGENER.
By Rayner & Cassell,
37, Chancery Lane, London, W.C.
THEODOR GENTZEN and
ALBERT WEGENER.
By Rayner & Cassell,
37, Chancery Lane, London, W.C.