Improvements in Filtering Apparatus for Oil and other Liquids.
Year: 1896

page_text: Date of Application, 5th May, 1896-Accepted, 13th June, 1896
COMPLETE SPECIFICATION.
Improvements in Filtering Apparatus for Oil and other Liquids.
I, RUDOLPH CONRADER, of the City of Erie, in the County of Erie, and
State of Pennsylvania, United States of America, Mechanical Engineer, 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:-
My invention relates to filtering apparatus specially adapted for cleansing and
purifying lubricating-oils, which have become charged with foreign substances, in
being used to lubricate journals, screw cutting, and other machinery..
I shall describe my invention referring to the accompanying drawings.
Fig. 1 is an elevation of filtering apparatus according to my invention.
Fig. 2 is a vertical section part in elevation.
Fig. 3 is an elevation of a detail.
Fig. 4 is an elevation, illustrating the construction of the filter tube.
Fig. 5, is a perspective of the cap for the filter tube.
A is a closed tank, of sufficient strength to resist considerable pressure, and A' is
a pipe with suitable valve a adapted to be connected to a water main, or other
source from which water or wet steam can be supplied under the desired pressure,
and a¹ is a cock for emptying the tank. In the top of the tank A is an inlet
pipe B with valve b, through which the tank A can be filled, either by a pipe b¹,
and a funnel, as in Fig. 2, or from a supply tank B', as in Fig. 1.
On one side of the tank A there is a gauge glass C to shew the height of the oil
in the tank.
On the top of the tank A is fixed an upright cylinder D in the lower part of
which is fixed a central tube D', its lower end communicating with a passage d
a pipe d' and valve d' which communicates with the top of the tank A. At the
base of the cylinder D there is also a cock d³ for discharging the contents of the
cylinder; and at E on one side of the upper part of the cylinder D is attached
the upper part of the water gauge E¹, this has a screw plug e', through which
water can be poured into the cylinder D.
The glass E extends from the upper holder e down to a holder e communicating
with the base of the cylinder D, whereby it allows the height of the water in the
cylinder D to be observed.
In the lower part of the cylinder D I place the oil separating and washing
device, shewn in Figs. 2 and 3. It consists of au annular chamber G, having an
opening in its bottom through which passes closely fitting, the base of the
pipe D. In the top of the chamber G is a larger opening g', in which is secured
a tube H closed at the top and large enough to give an annular passage h around
the tube D', so that oil forced up the pipe D', can descend to the chamber G. In
the top of the chamber G is a small aperture 93, through which the oil passes
slowly out into the water surrounding H. On the outside of the tube H is an
interrupted helical flange made in parts I I', and I, which partly overlap each
other; each of these has on its outer edge a downwardly projecting lip i. The
lower end of the lowest of these helical flanges I is directly over the opening g³
so that as the oil issues from 9 it strikes the underside of the flange I and travels
along it until it passes out from under the upper end of I; thence it rises and is
caught by the lower end of the flange I' and afterwards by the flange 12, whence it
finally rises to the surface of the water in the cylinder D. In the upper part of

page_text: this cylinder is a filtering device which consists preferably of a perforated tube J,
having a cap J', with a nipple j which is screwed into the cap F¹ of the cylinder D,
and communicates with a discharge pipe f, provided with a valve f¹. The cap
Ji
is also provided with a downwardly projecting annular flange j' which receives the
first coil of a fibrous cord or tape K; this cord or tape K is preferably of asbestos,
but other fibrous material may be used. It is wound closely around the perforated
tube J until it covers the greater part of a screw thread k formed on the lower end
of the tube J. A screw cap L (Fig. 5) is screwed on the tube J, this cap having
a lip which encloses the last coil of the cord or tape K. The cap L is screwed
on the tube J until it compresses the coils of K longitudinally rendering the
fibrous material sufficiently close to filter properly the oil passing through it.
As the oil actuated by continuous pressure in the tank A gradually passes out of
the opening 2 and rises it fills the cylinder D, above the surface of the water
therein, until it rises up around the filtering tube J and passes through the filtering
material K into the interior of the tube J and out through the nipple j and
discharge pipe f.
In operation, the tank A. is first nearly filled through valve 6 with the oil to be
filtered, and the cylinder D is also filled with water substantially up to the line F;
the valve b is then closed and the cocks a and d² opened, and water or wet steam
according to the nature of the oil to be filtered then passes into the tank A under
the required pressure. The water settles to the bottom of the tank A gradually
forcing the oil up and out through the pipe d', passage d and pipe D' down through
the annular passage h into the chamber G, out through the aperture g³ up
through the water under the flanges I, I' and 12 in a finely divided condition, and
finally the oil rises above the water accumulating until it passes through the
filtering material K into the perforated pipe J and thence to the outlet pipe f
Obviously the distributing device consisting of the helical flanges, and the filter
proper consisting of the fibrous cord or tape wound on a perforated tube are
applicable for the filtration of liquids other than oil.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. Oil filtering apparatus comprising a closed tank charged with oil to be
filtered, and supplied with water or wet steam under pressure, and a filter connected
to the tank, through which the pressure of the water or steam forces the oil,
substantially as and for the purpose set forth.
2. In the filtering apparatus above referred to, a closed chamber communicating
with the tank, and containing water surrounding a distributing device in its lower
part and filtering material in its upper part, substantially as and for the purpose
set forth.
3. A distributing device for an oil filter consisting of helical flanges surrounding
an upright pipe each flange having a downwardly projecting flange on its periphery
in combination with a discharge under the end of the lowest flange arranged and
operating, substantially as and for the purpose set forth.
4. A filter, consisting of a perforated tube having wound on it a fibrous cord or
tape between a recessed cap fixed on the tube and another recessed cap screwed on
the tube so as to compress the coils of the cord or tape longitudinally substantially
as and for the purpose set forth.
Dated this 5th dex of Man 10ne
ABEL & IMRAY,
Agents for the Applicant.