An Improved Filtering Apparatus for Oil and the like.
Year: 1892

page_text: Date of Application, 16 h Feh.. 1892-Accepted, 19th Mar., 1892
COMPLETE SPECIFICATION.
An Improved Filtering Apparatus for Oil and the like.
I HEINRICH BERK of Rossmarkt No. 7, Chemnitz, Saxony, German Empire,
Civil 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 :-
This invention relates to an improved filtering apparatus for oil and the like and
is illustrated in the accompanying drawings.
In the apparatus represented in Figs. 1 and 2 the inner hollow cylinder or
casing a is joined to the outer casing by means of the disc-ring c.
The upper portion of a reaches a short way into b whereby is formed a circular
and tight space d. In the lower end of a is placed a sieve bottom a¹, upon which
rests the filter-material a" which may consist of cotton waste, shavings or the like,
and again on top a sieve plate a³, the whole being weighted by weights at
Upon the disc-ring e, between a and b rests a loose casing e made of wire gauze
or perforated metal, it reaches from c nearly to the top of casing b and divides the
ring-shaped compartment d and the space above, into two portions.
This casing e, as indicated in Fig. 3 is covered over by one or more layers e¹ of felt,
cloth or the like of suitable thickness and width of mesh, the cover being sufficiently
long to allow it to be laid under the lower edge of e at e³ when placed on
disc c.
The apparatus may be placed upon a reservoir like stand f. The fluid to be
filtered, such as for instance the dirty waste oil recovered from the bearings of
shafting and machinery generally, is poured into the apparatus either direct from
the top or through the funnel b¹.
Entering into the circular compartment contained between band e it fills this
space first, proceeds thence into the interior and ultimately when there is a sufficient
quantity-fills the space above the filter a gradually filtering through a³ in a down-
ward direction and being gathered in reservoir f whence it may be let off according
to requirements through tap f¹.
The space d having no outlet at the bottom and all the liquid being forced to
pass over edge a into the filter a the impurities which are of greater specific
gravity will gather at the bottom of d whence they can be let off through tap 6³.
The system remains the same whether its base be circular or square.
Filtering cylinder or casing a being lengthened so as to reach to the upper edge
of 6 and this prolongation being perforated and surrounded with filter material,
casing e becomes unnecessary (see Fig. 4), although I prefer using the loose coarse
filter e (as shewn Figs. 1, 2 & 3) the same presenting a larger filtering surface on
account of its greater diameter and greater height, being easier cleaned and
surrounded with filter material and allowing of easier access to the other parts.
When the oil is not very dirty e and e' may be left off altogether.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what I
claim is :
1) A filtering apparatus consisting essentially of two casings placed and fixed
in such a manner relatively to each other and by means of a disc ring c that a
space is formed substantially as and for the purpose described.
2) In such filtering apparatus the means for retaining the impurities consisting
first in a clothed perforated casing e (or the corresponding prolongation of a as

page_text: indicated in Fig. 4) and secondly in filtering material placed in casing a
separately or in combination, substantially in the manner described and shewn in the
drawing.
Dated this 16th day of February 1809
C. R. BONNE & Co.,
57 & 58, Chancery Lane, W.C.,
Authorised Patent and Trade Mark Agents.