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Патент USA US2407046

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Patented Sept. 3, 1.946
2,407,045
UNITED STATES PATENT OFFICE
2,407,046
EEADILY CLEANABLE FILTER
Cecil Gordon Vokes, London, England
Application March 15, 1944, Serial No. 526,571
in Great Britain January 27, 1943
6 Claims. (Cl. 210—167)
9
ad
the header. The nut l2 thus clamps the end caps
5 and It) to the ends of cylinder 2. A bottom
plug it has iournaled coaxially within it a spin
dle l9 having an axial bore in which the rod I3
bears loosely. The spindle I9 has an upwardly
projecting fork 2!] and an external downwardly
‘ 1
This invention provides a filter incorporating
means for mechanical cleaning of the ?lter
screen. Many materials used for ?ltering get ob
structed by a shallow deposit on the “dirty” side
long before the general body of material has be
come choked and provision is sometimes made
for removing from a ?lter casing a unit including
projecting operating handle 2 I.
the screen so that the deposit can be removed
Surrounding
the felt discs is a rotatable cage 22 with‘ a lower
relatively narrow cross-member or bar 23 loosely
"engaged by the fork 20 (see Fig. 2). In the
form shown the cage comprises a cylinder 22
and the unit replaced. It has also been proposed
to use scraping means bearing resiliently against
the dirty surface of a filter screen of circular
section and relatively movable by rotation about
freely centered about the unit, so that the
scrapers (formed as shown by pieces 24 struck in
wardly to form inclined slots 25 and disposed
ing and to provide for the sludge or deposit to be
drawn oil‘. ‘The improved ?lter is of this latter cl about the outside of its circumference) auto
kind and has a cage or like mountln’Y which car»
matically tend to equalize their contact on the
ries scraping means disposed about the circum
dirty (outer) side of the felt discs l. The inter- '
ierence of the screen and is freely centered rela
nal surfaces of the scrapers are made to lit with
tively to the screen so tending automatically to
resilient pressure against the cylindrical outer
give a uniform scraping contact about the screen ill) surface of the assembled discs. The slight resil
as rotation takes place.
ience of thediscs may suf?ce or the scrapers may
Other parts of the invention are embodied in a
themselves be somewhat resilient or resiliently
typical form which will now be described with
mounted in the cylinder or cage 22 and it will be
reference to the accompanying drawing. ‘This
apparent that the contact of scraping means dis
form is primarily intended as an oil ?lter to be
posed about the screen automatically tends to
uniformity.
inserted in a by-pass leading straight back to the
oil reservoir or sump and not supplying the bear
In operation the voil, passing through the slots
lugs. to give rather ?ne filtration of a relatively
25 results in the dirt building up as a ?lm on the
the axis of the screen, from outside the ?lter cas
small proportion of the circulating lubricating oil
surface of the material.
of
internal combustion engine. The parts of
the invention for which a patent is desired are
those delimited by the claims.
In the drawing:
Fig. 1 is a central sectional elevation, and
ating handle clockwise looking up along the rod
is the dirt and sludge are loosened and scraped
or sliced off and worked downwardly by the in
clined scraper edges, so that they ?nally fall to
the bottom of the casing where by removing the
plug (or opening a tap) they can be withdrawn.
Clearly various other arrangements can be de
vised for rotating means resiliently bearing on a
relatively small area and cleaning or scraping the
Fig. 2 is a detail to a larger scale.
The unit or element is built up of discs l of
felt or other suitable material ?rmly mounted on
a central perforated cylinder 2.> End plates
5 and it are retained by securing centrally to
plate 5 a tube section ii, substantially midway be
external or internal surface of a cylindrical unit,
4-0 with suitable sumps and plugs or taps for with
drawing the sludge.
tween the ends of said sleeve, as shown. A de
pression in plate 5 concentric with the tube sec
tion 4, receives
against the end
head casting 8.
4 is attached to
On rotating the oper
I claim:
1. A ?lter comprising a casing, a hollow cy
lindrical ?lter element in said casing, a cage
formed of resilient material in said casing, sur
a packing ring 6 which bears
of the outlet passage '3 of the
The lower end portion 3 of tube
a spider 5 to which the second
rounding said element in spaced relation thereto,
and having scraper blades struck inwardly from
end cap Ii} is secured by a bolt ! i extending cen
trally through cap it and a nut E2. The bolt is
extended as an axial rod i3 of reduced diameter.
its surface to form scraper edges resiliently en
gaging the outer surface of said element, each
The upper portion of tube ll- has two diametrically
opposite bayonet slots at M to engage a cross
edge forming a section of a helix about the com
mon axis of said element and cage, and means
bar l5 ?tting holes in the walls '! of the ‘outlet
passage of the ?lter casing header 8. The inlet
passage 15 leads into the space surrounding the
tive rotation of said cage and‘ element.
2. in a ?lter, a casing, a hollow cylindrical
unitwithin the cylindrical casing ll secured to
operable externally of said casing to effect rela
1i CA
?ltering element ?xedly mounted in said casing,
2,407,046
3
4
a cage formed of resilient-material in said casing
including a top plate, a cage formed of resilient
material in said casing surrounding and substan
tially axially coextensive with said element in
spaced relation thereto, the upper end of said
cage being ?anged inwardly to rest loosely on
surrounding said element in spaced relation
thereto and substantially axially coextensive
therewith, said cage having scraper blades sym
metrically mounted about said cage and extend
ing inwardly therefrom, each said blade having
an edge extending helically of and resiliently en
tending resilient scraper blades forming scraper
gaging said element, means mounting said cage
for axial rotation about said element and for
edges in the contact with the outer surface of
said element, each edge forming a section of a
said top plate, said cage having inwardly-ex
limited translation transversely to said element, 10 helix about the axis of said element, a spindle
journalled in the lower wall of said casing co
whereby the resiliency of said blades maintains
axially with said element and having a forked
said cage substantially coaxial with said element,
upper end and a handle at its lower end exterior
ly of said casing, and a member secured diamet
3. In a ?lter, a casing, a hollow cylindrical ?l 15 rically of said cage at its lower end and rest
ing loosely in said fork, said cage being main
ter element ?xed in said casing, a cylindrical cage
tained coaxial of said element by the resiliency
formed of resilient material and mounted in said
of said blades.
casing for rotation externally about and coaxi
6. In a ?lter, a closed casing having a central
ally with said element in radially spaced relation
thereto, said cage having an axial dimension not 20 axis, the upper end of said casing being closed by
a header having a cylindrical wall coaxial of said
less than that of said element and having a plu
rality of integral blades extending inwardly from
axis to form a chamber, an outlet port in said
its surface to form scraper edges each resiliently
header in communication with said chamber, a
hollow cylindrical ?ltering element in said cas
engaging the outer surface of said element, each
said edge being substantially in the form of a 25 ing coaxial with said axis and including an upper
plate across one end of said element, a tube‘sec
portion of a helix extending coaxially of said
tion extending through and ?xed to said ?rst
cage said edges overlapping axially of said cage,
plate coaxially with said element, said tube hav
whereby, on rotation of said cage, said edges act
ing an upper portion having bayonet slot therein
to clean the entire external ?ltering surface of
said element, and means engaging said cage and 30 and adapted to slidably ?t said chamber and to
engage lugs therein to hold said upper plate in
operable exteriorly of said casing, to rotate said
?uid-tight engagement with the lower edge of
cage relatively to said element.
said chamber, a second plate extending over and
4. In a ?lter, a casing, a hollow ?lter compris
closing the lower end of said element, means con
ing a foraminous cylinder, a sleeve-like ?lter ele
ment surrounding and ?tting said cylinder to 35 necting said lower plate and tube section to clamp
said element between said plates, a rod project
form a cylindrical outer surface, upper and lower
ing downwardly from said lower plate along said
plates, means securing said plates together to
axis, a spindle journaled in the lower end of said
engage the ends of said cylinder and clamp said
casing for rotation on the axis of said element
element therebetween, said means comprising a
tube section secured centrally and intermediate 40 and having an axial bore loosely receiving said
rod and also having a forked end within said cas
its ends to said upper plate, a spider secured to
ing, a cage coaxial of and surrounding said ele
the lower end of said section, bolt and nut means
ment, said cage having inwardly extending heli
extending axially of said cylinder and element
cally-arranged blades providing‘ scraper edges
and connecting said spider and lower plate, and
a releasable connection between the upper end of 4 resiliently engaging said element, said cage hav
ing an upper ?ange resting loosely on said upper
said tube section and said casing a cage formed
plate and a bar extending diametrically across
of resilient material, surrounding said ?lter in
its lower end, said bar being loosely journaled on
radially spaced relation thereto, and having
said rod and engaging said fork, said spindle being
blades struck inwardly therefrom, each blade
forming an edge resiliently engaging said ele 50 rotatable exteriorly of said casing to thereby ro
tate said cage, the resiliency of said blades act
ment, said cage including an inward flange
ing to maintain said cage substantially coaxial
resting on said upper plate to thereby support
with said element and all said scraper edges in
said cage and means engaging said cage and op
erable exteriorly of said casing to rotate said
contact therewith, and an inlet port in said
header in communiaction with said casing ex
cage relatively to said element.
teriorly of said element.
5. A ?lter comprising a casing, a hollow cylin
CECIL GORDON VOKES.
drical ?lter element secured in said casing, and
and means operable from the exterior of said cas
ing for rotating said cage.
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