Improvements in Filtering Apparatus.
Year: 1895

page_text: Date of Application, 23rd Oct., 1895
Complete Specification Lelt, 23rd July, 1896-Accepted, 12th Sept., 1896
Improvements in Filtering Apparatus.
I, CHARLES WHITFIELD, of Anglezarke, Kettering, in the County of
Northampton, Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention relates more especially to filtering apparatus for filtering dirty
oil such as that collected from the bearings and other working parts of machinery
for example, but it is also applicable for filtering other liquids
In certain kinds of oil filtering apparatus at present in use the sediment from
the dirty oil is deposited at the bottom of the chamber into which the oil to be
filtered is passed before reaching the filtering material, and the construction of the
apparatus is such that the filtering material is immersed in such sediment and soon
gets choked whereby the apparatus is rendered inoperative. The object of the
present invention is to provide means whereby the sediment from the oil is kept
away from the filtering material so that there is no chance of the latter becoming
fouled or choked thereby. For this purpose I employ a settling tank and filtering
vessel so combined and arranged that the dirty oil is delivered at or near the
bottom of the settling tank where it deposits a certain amount of the dirt contained
in it, the partly clarified oil rising to the top from whence the supply to the
filtering vessel is taken instead of from the bottom as heretofore. The apparatus
may conveniently consist of a tank of cylindrical or other suitable shape inside of
which is placed a cylindrical or other suitably shaped filtering vessel closed at the
bottom, but provided with a perforated false bottom on which is placed the filtering
material. Connected with the space between the bottom of the filtering vessel
and the false bottom above it, is a pipe open at its upper end which rises to a
certain height in the settling tank. The duty oil is introduced into the lower end
of the settling tank by a suitable pipe or otherwise and gradually rises, leaving
behind it at the bottom of the settling tank a certain portion of its dirt in the form
of sediment which can be drawn off from time to time through a tap provided for
that purpose. The partly claufied oil using to the upper part of the settling tank
flows off by the aforesaid pipe to the space below the false bottom in the filtering
vessel whence it rises through the filtering material to the upper part of the
bltering vessel and can then be drawn off though a tap or otherwise for use. By
these means the filteung material is entirely isolated from the sediment in the
settling tank and only comes in contact with partly clarified oil whereby the filter
can be worked a much longer time than heretofore before the filtering material
requires to be changed or cleaned.
The improved apparatus has been described above with reference to its
application to upward filtration, but it is obvious that by slightly modifying the
arrangement it may be adapted to downward filtration. In this case the partly
clarified oil overflowing from the upper part of the settling tank 18 led direct into
the upper part of the filtering vessel whence it flows downwards through the
filtering material into the space below the false bottom in the filtering vessel whence
it can be drawn off through a tap or otherwise. Instead of the filtering vessel
beng placed inside the settling tank the latter may be placed inside the former, or

page_text: the two vessels may be kept separate from each other but connected together by
Buitable pipes or other connections.
Dated this 23rd day of October 1895.
CHAS. WHITFIELD,
Per W. II. Beck,
115 Cannon Street, London, E.C., Agent.
.
Improvements in Filtering Apparatus
1, CHARLES WHITFIELD, of Anglezarke, Kettering, in the County of
Northampton, 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 stateinent
-
This invention relates more especially to filtering apparatus for filtering dirty
oil such as that collected from the bearings and other working parts of machinery
for example; but it is also applicable for filtering other liquids.
In certain kinds of oil filtering apparatus at present in use the sediment from
the dirty oil is deposited at the bottom of the chamber into which the oil to be
filtered is passed before reaching the filtering material, and the construction of the
apparatus is such that the filtering material is immersed in such sediment and
soon gets choked, whereby the apparatus is rendered inoperative. The object of
the present invention is to provide means whereby the sediment from the oil is
kept away from the filtering material so that thore is no chance of the latter
becoming fouled or choked thereby
For this purpose I employ a settling tank and filtering, vessel, so combined and
arranged that the duty oil is delivered at or near the bottom of the settling tank
where it deposits a certain amount of the dirt contained in it, the partly clarified
oil rising to the top from whence the supply to the filtering vessel as taken
instead of from the bottom as heretofore.
The accompanying sheet of drawings shows in diagrammatic sectional elevation
various arrangements of filtering apparatus constructed in accordance with my
invention.
The apparatus may conveniently consist of a settling tank A, see Figure 1, of
cylindrical or other suntable shape, inside of which is placed a cylindrical or other
suitably shaped filtering vessel B closed at the bottom, but provided with a
perforated false-bottom Con which is placed the filtering material D. Connected
with the space between the bottom of the filtering vessel B and the false-bottom C
is a pipe E, open at its upper end, which rises to a certain height in the settling
tank A. The dirty oil is introduced into the lower end of the settling tank ▲ by
a suitable pipe F, or other wise, and gradually rises leaving behind it, at the bottom
of the settling tauk A, a certain portion of its dirt in the form of sediment, which
can be drawn off from time to time through a tap G, or through any other closeable
opening provided for that purpose The partly clarified oil rising to the upper
part of the settling tank A flows off by the pipe E to the space below the false-
bottoin C in the filtering vessel, whence it rises through the filtering material D
to the upper part of the filtering vessel, and flows off through a pipe H or other
suitable outlet, for use.
By these means the filtering material D is entirely isolated from the sediment
in the settling tank, and only comes in contact with partly clarified oil, whereby
the filter can be worked a much longer time than heretofore before the filtering
matotal requires to be changed or cleaned.
The improved apparatus has been described above, as illustrated in Figure 1,
Rith reference to its application to upward filtration, Figure 2 illustrates how it

page_text: may be adapted to downward filtration. In this case the partly claufiel ol
overflows from the upper part of the settling tank A into the upper part of the
filter mg vessel B, whence it flows downwards through the filtering material D
into the space below the perforated false-bottom C in the filtering vessel, and
from which space it can be drawn off through a tap II or other wise.
Instead of the filtering vessel being placed inside the settling tank the latter-
may be placed inside the former, as shown in Figure 3.
which the filtration is
In the arrangements shown in Figures 2 and 3, in
downwards into the pice below the false-botton C, it is sometimes desuable to
employ a pipe J for the escape of any an that may be carried into such space along.
with the filtered oil
It is sometimes desirable to provide means for compressing or compacting
the filtering material, this may be effected by provuling a perforated plate K
resting on the top of the filtering material, and pressed tow uds the fale-botton C
by means of a screwed bolt L passing through both plates, and provided with a
tightening nut M as shown in Figure 1. In Figure 2 the air tube J is adapted
to serve not only as an an pipe but also as the bolt for pressing the plite K
towards the plate C in order to compress the filtering material D.
Similar letters of reference relate to like parts in all the figures of the
drawings.
Having now particularly described and ascertained the nature of the sand
invention, and in what manner the same is to be performed, I declare that what
I claim is:-
First. The use, in combination with the filtering chainber of a filtering apparatus,
of a settling tank the upper part of which is in communication with the receiving
end of the filtering chamber, substantially as described, and for the purpose
specified.
Second. In filtering apparatus the combination of a settling tank with a filtering
chamber substantially as described.
Dated this 22nd day of July 1896.