Improvements in Filtering Apparatus.
Year: 1899

page_text: HUVIUNAL DIIVATIVA
Improvements in Filtering Apparatus.
[Communicated from abroad by "ALLGEMEINE STÄDTEREINIGUNGS-GESELLSCHAFT
MIT BESCHRÄNKTER HAFTUNG," of Wiesbaden, in the Empire of Germany,
Manufacturers.]
I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co., Patent Agents,
45, Southampton Buildings, in the County of Middlesex, do hereby declare the
nature of this invention to be as follows:-
For many purposes of the trade, including that of drain-water purifying works
in towns, filtering apparatus are required which, while their cost is low, the
space they occupy small, and their method of operation simple, are capable of
dealing with large quantities of liquid at a time.
The subject of this invention is a filter in which these conditions are carried
out in an exceptionally complete and effective manner.
The improved filter consists of a basin or reservoir, which may be either open
or closed at the top and which serves for the reception of the liquid to be purified;
a revolving drum or barrel arranged within the said reservoir and serving as
a receiver for the filtering material, such as sand, through which the liquid is
to flow and a tubular chamber arranged within the barrel which receives the
liquid as it is purified and discharges it through a hollow shaft or trunnion.
The liquid is delivered into the basin through a feed-pipe; it then passes
through the perforated wall of the barrel, through the filtering material: thence,
after having been purified, through the perforated wall of the tubular chamber;
and from this it is discharged through the hollow trunnion. During this passage
of the liquid the barrel does not revolve.
Where the inner tubular chamber is arranged concentrically with the axis of
the barrel, the upper part of the tubular chamber should preferably be left
unperforated, so as to prevent the liquid, after it has passed through the central
layer of the filtering material, when possibly it has not yet had time to be
thoroughly filtered, from entering the tubular chamber in an impure condition.
The necessity of providing the inner chamber with an unperforated top may,
however, be avoided, and the entire surface of the said chamber may be used
as a strainer, by arranging such chamber eccentrically to the outer barrel; as
in that case all parts of it are sufficiently covered with filtering material, its
capacity being nevertheless equal to that of a concentric tubular chamber.
The filtering barrel is but partly filled with filtering material, an empty space
being left in its upper part, so that the filtering material may from time to time
be cleansed by a current of liquid being sent throughout while the barrel is

page_text: rotated; it being at the same time set in motion, or agitated, owing to the said
empty space, and friction being set up among its parts or layers, whereby it
is freed from loose particles of impurities.
HASELTINE, LAKE & Co.,,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.
Improvements in Filtering Apparatus.
I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co., Patent Agents,
45, Southampton Buildings, in the County of Middlesex, 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:-
The present invention relates to improvements in filtering apparatus in which
a revolving drum or barrel is designed for the reception of the filtering material
through which the liquid to be purified is to flow, in order to be discharged
through a hollow shaft or trunnion.
The objects of my improvements are to adapt filtering apparatus of this class
for many commercial purposes, including that of drain-water purifying works
in towns, and fo carry out the same in an exceptionally complete and effective
manner, so that while the cost of the filtering apparatus is low, the space it
occupies small, and the operation simple, such apparatus is capable of dealing with
large quantities of liquid.
I attain these objects by the mechanism and arrangement of parts illustrated
in the accompanying drawing, in which:
Figure 1 is a vertical longitudinal section of the entire filtering apparatus,
and
Figure 2, a cross section on the line 1-2 Figure 1.
Similar letters of reference indicate corresponding parts in both the figures of
the drawings.
The filtering apparatus consists of a basin or reservoir b, which may be either
open or closed at the top and which serves for the reception of the liquid to be
purified a revolving drum or barrel a arranged within the said reservoir and
serving as a receiver for the filtering material, such as sand, through which the
liquid is to flow and a tubular chamber arranged within the barrel which
receives the liquid as it is purified and discharges it through a hollow shaft or
trunnion z.
The liquid is delivered into the basin & through a feed-pipe 1; it then passes
through the perforated wall of the barrel a. through the filtering material; thence,
after having been purified, through the perforated wall of the tubular chamber c;
and from this it is discharged through the hollow trunnion z. During this
passage of the liquid the barrel does not revolve.
Where the inner tubular chamber is arranged concentrically with the axis of
the barrel as indicated by dotted lines in Figure 2, the upper part of the
tubular chamber should preferably he left unperforated, so as to prevent the
liquid, after it has passed through the central layer of the filtering
material, when possibly it has not yet had time to be thoroughly filtered, from
entering the tubular chamber in an impure condition. The necessity of providing
the inner chamber with an unperforated top may, however, he avoided, and the
entire surface of the said chamber may be used as a strainer, by arranging such

page_text: chamber eccentrically to the outer barrel, as illustrated in Figure 2; as in that
case all parts of it are sufficiently covered with filtering material, its capacity
being nevertheless equal to that of a concentric tubular chamber.
The filtering barrel is but partly filled with filtering material, an empty space
being left in its upper part, so that the filtering material may from time to time
be cleansed by a current of liquid being sent throughout while the barrel is
rotated; it being at the same time set in motion, or agitated, owing to the said
empty space, and friction being set up among its parts or layers, whereby it
is freed from loose particles of impurities.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, as communicated to
me by my foreign correspondent, I declare that what I claim is:
-
A filtering apparatus comprising a cylindrical chamber, a similar smaller
chamber arranged eccentrically within the larger one, both having perforated
peripheral walls, and a granular filtering material partly filling the space between
the two chambers; in combination with a reservoir for the liquid to be filtered,
in which reservoir said filter is revolubly mounted so as to be immersed in the
liquid therein, one of the journals of the outer chamber being tubular, in com-
munication with the inner chamber, and extending through one of the walls of
the reservoir, substantially as set forth.
Dated this 7th day of Dacambar 1990
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.