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Патент USA US3076562

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Feb. 5, 1963 -
Filed March 28, 1956
0ol ‘IOn0l.
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United States
‘ '
Patented F ab. 5, 1963.
assembly they are slightly compacted so that the con
tacting surfaces of adjacent pads tend to interweave one
into the other to present a substantially continuous ?lter
Gustav H. Yelinek, Racine, Wis., assignor, by mesne as
signments, to Walker Manufacturing Company, Racine,
Wis, a corporation of Delaware
The other elements which make up the ?lter cartridge
will now be described. The ?lter tube 2, is perforated
and extends through the central apertures of the sisal
pads 7 and beyond the ends of the ?lter body 1. At its
This invention relates to ?lter cartridges generally and
extremities it carries the end caps 3 and 4. The stamped
more particularly to disposableor non-permanent ?lter 10 metal end caps 3 and 4 are substantially identical in’ con
cartridges of the type used to ?lter liquids and gases, for
struction and have centrally located depressions 9 and
example, oil in lubricating systems, such as lubricating
11, respectively, which engage the extremities of the ?lter
Filed Mar. 28, 1956, Ser. No. 574,435
5 Claims. ((31. 2l0-457)
systems in internal combustion engines.
tube and inturned peripheral portions 12 and 14 respec
tively which embrace the ?lter medium. Apertures 13
?lter cartridge of especially practical construction con 15 and 15, respectively, are’ formed in the centrally located
sisting of relatively few inexpensive parts and which may
depressions of the end caps 3‘ and 4 to provide an oil
be quickly and easily assembled without special tools or
inlet or outlet depending upon how the cartridge is used.
The opening 13 in the centrally located recess 9 of the
It is another object of'the invention to provide a throw
end cap 3 is shown having af?xed therein a grommet 17
away type ?lter cartridge which may be manufactured 20 to afford a liquid seal at that end about a tubular mem
at extremely low cost, lower in most cases than the cost
ber, for example, in an oil ?lter housing in which the"
of cleaning permanent type ?lter cartridges, but which
cartridge is to be used. For example in FIG. 2. of _U.S§
has superior ?ltering characteristics.
Patent 2,680,520, the grommet 17 could be used to provide
It is another object of the invention to provide a ?lter
a seal about tube '51 (replacing seal 54), the present cari'
cartridge embodying improved means for retaining the
tridgebeing used in lieu of ?lter medium 21 in said
several parts in operative relation wherebyan inexpen
patent. When used in combination with a bypass car
sive assembly is provided; the assembly being of a type
tridge, the ?ltering ability of the combination is greatly
which promotes depth-type ?ltration, but which has a
enhanced since the sisal ?ltering medium of the cartridge
high rate of ?ow and an exceptionally long useful ?ow
of the present invention traps the large particles and
allows only the very ?nest sludge forming constituents
A further object is to provide an inexpensive, replace
to enter the bypass cartridge thereby greatly extending the
able full ?ow ?lter cartridge that may be very advanta
life of the bypass ?lter cartridge. It will also be ap
geously used ‘in combination with a part ?ow cartridge in
parent that the ?lter cartridge of the present invention
a ?lter embodying both methods of ?ltration (see Beards
may be employed alone in an oil ?lter unit. For strengthi,
ening, the end caps 3 and 4 have annular recesses 18, 19,
ley 2,680,520).
The above and other objects of the invention will be
respectively, which axially protrude into the sistal pads
apparent from thefollowing description, reference being
and additionally function to prevent liquid to be ?ltered
had to the accompanying drawing, wherein like numerals
from traveling through the cartridge without passing
are employed to designate like parts throughout the same. 40 through the ?lter medium. '
. In the drawings:
The various elements of the cartridge are held together
FIGURE 1 is a vertical section of the ?lter cartridge
by suitable fabric means. The fabric means is preferably,
embodying the present invention;
in vthe form of a tubular cotton sock. 5 having open ends.‘
FIG. 2 is a plan view of the structure shown in FIG.
One of the open ends has reinforced stitching so as to
1; and
retain a drawstring cord 21, while the other is plain for
FIG. 3 is a sectional view taken along the line 3-3 of
threading through a washer 22 of ?brous composition as
FIG. 1.
will be described. The cotton sock may be knitted, woven,
In accordance with the present invention there is shown
crocheted, formed of netting or by any of the methods
and described a ?lter cartridge of the throw-away type
well known inthe art. It must have the ability to stretch
particularly adapted for use in oil ?lters on automotive 50 so that it may be easily drawn about the ?lter medium and‘
vehicles. The ?lter cartridge generally comprises a ?lter
the end caps and it must resist being coated by the oil”
passing through it. A cotton sock made according to the‘
medium 1, a hollow ?lter tube 2 extending through the
following speci?cations has been found to possess these
center of the ?lter medium, end caps 3 and 4, and fabric
It is an important object of the invention to provide a
means 5 retaining the elements together as a unitary ?lter
cartridge assembly.
Considering the structure in more detail, FIGURE 1'
properties: ‘knitted cotton sock, 4" machine, 100 needles,
55 one end 14/1 yarn per vfeed, 3" natural width, ‘8” stretch
width by cutting 2” piece stretched the limit with ?ngers,
is a sectional view on a vertical axis of the ?lter car
The cotton sock not only retains the several parts of the
tridge. The ?lter medium 1 preferably comprises a plu
rality of individual ?brous pads 7. The pads are prefer
ably of sisal which is preeminently superior for the pur
within the ?lter medium.
poses of the present invention because of its low cost
and because of the enormous number of edges and voids
it provides in which dirt and other foreign material car
ried by the oil can be trapped. Sisal is a well known
material being sometimes described more technically as
a strong, durable, ?bre derived from the leaves‘ of a
plant of the genus Agave sisalina. The individual sisal
pads 7 are preferably circular in cross section and have a
assembly together but also keeps the broken, loose ?ber
Another relatively inexpensive ‘but useful element of the,
?lter cartridge is the tube wrapper which prevents loose,
disintegrated ?bers of the sisal ?lter'medium from enter
ing the con?nes of the ?lter tube 2. The tube‘ wrapper 23,v
is of a tough oil pervious tissue paper and preferably
formed from paper of the type sold under the trade-_
marks Dexstar or Viskon. FIGURE 3 shows the tube
wrapper 23 in more detail. The tube wrapper slides over
the perforated ?lter tube and has a plurality of pleats per
manently formed therein which extend longitudinally over‘
central aperture therein, i.e.,_in the form of apertured
discs. The arrangement of the sisal pads collectively in 70 the length of the tube wrapper and project into the ?lter
the ?lter cartridge is such that the individual pads are
stacked one above the other and when retained in the
medium. The purpose of the pleats is to allow for con—
traction and expansion of the tube wrapper to prevent
tearing on ‘the ?lter tube as it changes dimensions because
of being‘su'bjected to alternate conditions'of dryness ‘and
faces of the said ?lter body to retain the end caps and
oil saturation.
separately handled and packaged. In assembling the ?lter
cartridge, ‘the tube wrapper 23‘ is slipped over the per
2. A ?lter cartridge comprising a plurality of compres
sible ?brous pads, each of said pads having a central aper~
ture, said pads being stacked one above the other with
their central apertures aligned to form a ?lter body hav
ing a central passageway therein, a perforated ?lter tube
extending through said central passageway, metal end
caps engaging and supporting the ends of the said ?lter
forated ?lter tube 2 and the sisal pads are stacked one
10 tube and ?lter body,and fabric means stretched over the
?lter'body'in a'unitary assembly.
In the manufacture of the '?lter cartridge of the present
invention, the _sis'al_pads are most economically ‘formed
inh'th'e ‘shape of individual circular pads having central
apertures. The individual padsiha've 'sui?cient body to be
above the otherwith their central‘apertures disposed about
said ?lter body and said end caps frictionally engaging
the outer surfaces of the said ?lter body to compress said
and closely ?tting the tube wrapper and form thereby a
relatively'dense closely interweaved ?lter medium which
pads and to retain the said ?brous pads, end caps and
?lter tube in a unitary ‘assembly.
sludge forming constituents of the _oil in its passage 15
3. A ?lter cartridge comprising a plurality of ?brous
thro'ugh ‘the cartridge. The end caps 3, 4 are then placed
pads, each of said pads having a'central aperture, said
with their central depressions 9, 1'1 engaging the ends of
pads being stacked one above the other with their central
the tube 2 and with‘their inturned peripheral portions 12,
apertures aligned to form a ?lter body having 7a central
1-4. embracing'the ends of the ?lter‘mediuni. One or the
passageway therein, a perforated ?lter tube extending
functions as ‘a unit in entrapping foreign particles and
bther’of. the end'capsimay be‘permanently v'secured‘to the
through the said‘passageway, rigid end‘cap's engagin'g'and
tube'llif desired. The ‘fabric means in the form of the
so'ck‘S is stretched‘at‘one ‘of the open ends, ‘pulled over
one end cap, drawn up‘ai'ound the sisal pads ‘and then
supporting said ?lter tube and ?lter body,ia washer, and
fabric means including a stretchable sock having open
ends, said sock being‘stretched over said ?lter body and
said'end'caps frictionally engaging the outer surfaces ‘of
the-‘said ?lter body and having one of the said open ends
pulled over the-other end cap. The open ‘end containing
the drawstring jisv drawn taut about the end cap it em
braces, while,the=plain open end is threaded‘th'rough the
drawn taut about one of the said end caps, and having
washer‘ 22 and drawn-back on itself reversely over the end
capit embracesand around the central portion of‘ the sock,
the friction of the fabric ‘Weave-being su?icient to retain
it in place. The cotton. sock provides for ready assembly
of the ?lter cartridge and securely‘ retains the several parts
together as a unit. The peripheral ‘surfaces of thesisal
the, other of the said'open ends threaded through said
30 central
and drawn back ‘on itself reversely over said
and the other of thesaid end caps around the
portions of ‘said sock whereby to retain the said
pads, end'caps and ?lter tube in ‘a unitary as
Pdds Pliers an enormous amount 'of frictional resistance
against: the cotton sock to prevent relative‘movement of
the parts of the. assembly. The ‘stretching-of the cotton
4.'A ?lter'cartridge comprising av plurality of ?brous
pads, said pads having central apertures and being stacked
35 one above the other with said central apertures ‘aligned
soclk'overtthe-rigid énd caps causes the end caps to com
was to form a longitudinally extending opening through
thevj?ltermedium and'the assemblylwill ‘retain its
out the plurality of pads, a perforated metal-?lter tube
‘form without the aid of the drawstring and washer, they
extending through said opening and having its extremities
lbeingv used to insure retention of the assembly under
disposed beyond the ends of the said pads,-rigid vend caps
rugged handling.
40 ?tted over the ends of‘ the said pads and having centrally
, (In operation, the- ?lter cartridge of the present inven
located depressions'with apertures therein engaging the
tion ‘may be employed either in conjunction with another
extremities of'said ?lter tube, annular ribs formed in
?lter cartridge, as previously described, or by itself in an
each of said end caps protruding axially into each of the
oil ‘?lter. The oil enters the ?lter'cartridge through the
cotton sock 5, passes radially through the sisal pads 7
where the dirtfa'nd other foreign particles are captured.
The ,oil‘the'n passes'through the tube wrapper 23 and into
the ?lter. tube 2 by way of the perforations therein and
thence through'either or'both of the openings 13, 15 at
the 'ends of the ,?l'ter tube, It is evident that, if desired,
the direction of ?ow could be just the reverse. Further,
one or both of, the end caps could be perforated to provide
for longitudinal ?ow through the ?lter body in the event
the' cartridge is to be used in a ?lter unit accommodating
such ?ow.
_ It can‘ thus ‘be seen that there has been provided a filter
cartridge which can be manufactured at extremely low
cost'and whichconsists or a few inexpensive parts which
may be quickly'a'ssem‘bled into an extremely practical ?lter
ends of the said pads, and fabric means including a
stretchable sock having open ends, said sock being
stretched over said cap ends and-said pads frictionally en
gaging the outer surfaces of said pads ‘and having one
of said open ends drawn taut about one of the said end
caps and having the other of the said open‘ ends drawn
back on itseif reversely over the other of the said’end
caps so was to retain said pads, end caps and ?lter tube in
a unitary assembly.
5. A ?lter cartridge’ comprising a plurality of circular
compressible sisal pads having central apertures and being
stacked one above the other so as to align said ‘aper
tures, a perforated metal ?lter tube extending through the
said aligned apertures and having its extremities disposed
beyond the ends of the said pads, a ?uid pervious tubular
cartridge.‘ The ?lter cartridge has extremely high e?i~
ciency with ‘a very high' rate of ?uid ?ow and at the same 60 paper wrapper having permanently formed pleats extend
ing longitudinally over the length of said Wrapper and em
tin'i‘e‘providing'for depth-type ?ltration, ‘and while clog
‘bedded in said pads, said Wrapper surrounding said ?lter
ging of the ?lter cartridge ,will occur requiring replace
tube and extending over the'length thereof, rigid end
ment,'it will occur only under extremely severe or long
caps ?tted 'over the ends of the said pads having centrally
continued use of the ?lter cartridge.
located depressions with apertures therein engaging the
While the ‘preferred embodiment of the invention has
extremities of the said ?lter tube, a washer, and fabric
been“ ‘shown and described, it will be understood that the
means including a stretchable sock having open ends, said
same is susceptible to variation, alteration and modi?ca
tionhiwithoutdeparting from the spirit thereof.
sock being stretched over said end caps and said sisal
70 pads frictionally engaging the outer surfaces of said pads
,1. A ?lter cartridge comprising a ?brous ?lter body,
and having one of the said open ends ‘drawn taut about
rigid metal‘ end caps engaging the ends of the said ?lter
one of the said end caps and having the other of the
JWhat is claimed is :l
body and having, ?ow diverting projections extending into
said body, and fabric means stretched over the said ?lter
body and end caps frictionally engaging the outer'sur
said open ends threaded through said Washer and drawn
back on itself reversely over the other of the said end
caps around the central portion of said sock whereby to
compress said pads and to retain said pads, said end caps
and said ?lter tube in a unitary assembly.
References Cited in thev ?le of this patent
Beck ________________ .._ May 2, 1939
Barley ______________ -_ Dec. 28,
La Brecque __________ __ Apr. 24,
Ahlijian ______________ __- Oct. 6,
White ________________ __ Apr. 20,
Robinson ____________ __ Jan. 24, 1956
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