Year: 1887

page_text: Date of Application, 28th Mar., 1887.
Specification Accepted, 17th May, 1887.
I. CARL ANTON KOELLNER of Neumühlen near Kiel in the Kingdom of Prussia
and German Empire, do hereby declare the nature of my said invention and in what
manner the same is to be performed to be particularly described and ascertained in
and by the following statement :—
By means of this filter-pump the fluid which has to be filtered or cleared of lye,
and which is collected and conveyed in buckets pails and other vessels, can be poured
direct into the filtering space and is pressed through the filtering material by the up
and down motion of a hollow plunger provided with a valve and is thus filtered.
In the drawing Fig. I, a filter-pump of this kind is représented. It has a hollow
plunger B, which fits tight in the bore of the cylinder, runs in guides and is provided
with a valve that opens into the under space.
The cylinder is provided on top with an enlarged space C which serves for the
reception of the fluid that is poured in to be filtered. The fluid runs from tbis
space through the hollow plunger B into the filtering space, fills the latter, and as
C
more of it is continually being poured into the cylinder it accumulates up to the top
of the enlarged space C. The fluid poured into the space C runs through the filtering
material of itself but very slowly, and therefore with a view to hastening the operation
the hollow plunger in the cylinder is made to move up and down. When the
plunger B rises, the valve with which it is provided opens, but as soon as the plunger
descends it closes. By this means part of the fluid contained in the cylinder and the
plunger is forced through the filtering material at every stroke of the piston.
The filtered fluid is delivered at pipe L or is conducted to any desired place by
means of pipes.
In
The lid is made to lift off so that the residuum, which is separated from the
fluid and settles above the filtering material S, can be removed when necessary.
the case of the filter-pump shown in Fig. II not the cylinder but the hollow
plunger B is provided with an enlarged space C which likewise serves as a reservoir.
The plunger B is led through a stuffing box and packed, and is also proveded with
a valve that opens into the under space.
The fluid to be filtered is poured in this case into the enlarged space of the
plunger, and as the valve attached to the plunger opens when the latter rises and

page_text: closes when it descends, part of the fluid contained in the plunger is forced at every
stroke of the plunger through the filtering material S. The fluid thus filtered runs
off at the support L'. The mud, dirt and other residuum that settles underneath the
filtering material is let off through the cock G.
If the filtering space is provided with a valve R and the valve of the plunger is
screwed fast, which can easily be done by means of a chain or connecting-rod m
fastened to the plunger or the pump-lever, the fluid can be led or sucked into the
filtering space and forced through the filtering material at every up and down motion
of the plunger.
By means of the thumb-screw H the filtering material can be regulated pressed
closer together or loosened, as may be necessary. The adjusting screws T (Fig. 1)
serve for the same purpose, and to enable their being regulated at any time and
whenever requisite without it is being necessary to remove the filter-lid, they are
made long enough to reach through the latter. They are packed in the stuffing-box e
of the lid and can be screwed up and down in the supports if fastened to the filter-lid.
With a view to loosening the filtering material whenever necessary and to prevent
its being pressed too close together by the fluid, variable perforated, bent elastic
plates are laid in between the different layers of the material. When the adjusting
screws are tightened up these plates become quite straight, as is shown in Figure 1.
But when the adjusting-screws are slackened up they spring back into their original
position, as may be seen in Figure III. Perforated stationary plates to provided with
adjusting-screws e can likewise be used, as is represented in Figure II. This filtering
layer is pressed together, as may be required, by the thumb-screws H but whenever
it is screwed down too tight or pressed together too much by the fluid so as to prevent
the requisite quantity of Huid from passing through the filtering material, the thumb-
screws H are slackened up and the adjusting screws are screwed down, by which
means the filtering material is loosened again."
20
Having now particularly described and ascetained the nature of my said invention
and in what manner the same is to be performed, I declare that what I claim is.
In a filter-pump
1. A hollow plunger provided at foot with a valve, which opens when the plunger
rises and allows the fluid to flow under the plunger, but which closes when the
plunger descends, so that the fluid is pressed through the filtering material by the
plunger.
2. An enlargement which serves as a reservoir and which is made either on a
hollow plunger provided with a valve opening into the under space, or on a pump
cylinder in which is a hollow plunger provided with a valve opening into the under
space.