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Jan. 7, 1947.
Filed Oct. 15, 1943
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3 Sheets-Sheet 1
Jan. 7, 1947.
Filed 001;. 13, 1943
3 Sheets-Sheet 2
Jan. 7, 1947.
Filedloct. 13, 1943
3 Sheets-Sheet 5
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Patented Jan. 7, 1947
Walter J. Newman, Chicago, Ill., assignor to Mar
vel Engineering Company, Chicago, 111., a cor
poration of Illinois
Application October 13, 1943, Serial No. 506,025
3 Claims. (Cl. 210-169)
.ends of both of these housings so far as they
The present invention relates to ?lters, and is
particularly concerned with the provision of an
improved ?lter having a particularly high effi
ciency and adapted to occupy a relatively small
are intended to be closed.
The bottom plate M, for example, may con
sist of a stamped sheet metal member, which is
formed with a centrally located cylindrical ?ange
I5 integrally joined to a circular portion I6, which
One of the objects of the invention is the pro
closes the lower end of the inner housing I2. The
vision of an improved ?lter which is sturdy and
diameter of the cylindrical portion I5 is prefer
which has in a relatively small volume a greatly,
ably such that the inner housing I2 ?ts about
increased area of active ?ltering surface over the
10 the cylindrical portion I5, to which it is sol
devices of the prior art.
'dered at IT.
Another object of the invention is the provi
integrally joined to the lower end of the cylin
sion of an improved ?lter which is simple, efii
drical portion I5 is a‘ radially and outwardly
cient, durable, adapted to be cleaned easily, and
extending bottom ?ange I8, which carries an
adapted to be used athigh rates of ?ow and high
or low pressures for long periods of time with 15 upwardly extending outer cylindrical ?ange I9.
The outer cylindrical ?ange I9 is at such a diame
out necessity for repair or replacement of any
of its parts.
, ter that it is adapted to receive the outer hous
Another object of the invention is the provi
sion of an improved ?lter of the class described
which is adapted to be manufactured at a very 20
low cost and thus placed within the range of a
vast number of users, and in which the ?ltering
unit is adapted to be recleaned and reused many
times so that there is no necessity for replace
ment of any of the parts of the ?lter under ordi 25
nary conditions of use.
Other objects and advantages of the invention
will be apparent from the following description
and the accompanying drawings, in which simi
ing member II.
The top plate I3 is similar in
construction to the bottom plate I4, except that
its circular plate I6 is provided with a centrally
located aperture 20 for passing a tubular conduit
member 2|, which is carried by the inner hous
ing I2.
The outer housing member II is preferably
formed of expanded metal, which has been so
pressed that all of its parts are in substantially
the same plane; andthis'housing member may
be formed out of a rectangular sheet of such.
expanded metal, which has been formed into a
cylinder and its adjacent edges soldered, brazed,
lar characters of reference indicate similar parts
throughout the several views.
welded, or otherwise secured together.
Referring to the drawings, of which there are ‘
two sheets,
Fig. 1 is a sectional view taken on a plane pass
ing through the axis of the ?lter, embodying my
The outer housing member II, as well as the
inner housing and all other metallic parts of the
?lter, are preferably galvanized so as to protect
them from corrosion, which might be induced
by exposure to the elements or use in corrosive
Fig. 2 is a fragmentary sectional view taken on
The diamond shaped apertures 22 in the ex
the plane of the line 2-2 of Fig. 1, looking in
panded metal of the outer housing I I are of suf
the direction of the arrows;
40 ?cient size to pass relatively thick liquids with
Fig. 3 is a top plan view of the ?lter;
Fig. 4 is a side elevational view, partially broken '
away to show the ?ltering unit;
Fig. 5 is a bottom plan view of the ?lter; and
Fig. 6 is an elevational view in partial section,
showing an arrangement for enclosing the ?lter
in a housing when it is to be interposed in a
pipe line.
Referring to Fig. l, the ?lter I0 embodying my
invention is preferably provided with reinforc
out restraint, but the expanded metal excludes all
large particles of foreign matter from contact
with the ?ltering unit 23, which is located be
tween the housings.
The‘ expanded metal is of sufficient strength,
being preferably made of steel, so that it pro
tects the ?ltering unit 23 against damage,
whether it beby compression exerted against
the strainer or by the ?lter being knocked about
ing and supporting inner and outer housings, the 50 when it is connected to a hose and thrown into
a receptacle or into engagement with some other
outer housing being indicated in its entirety by
hard object.
the numeral II, and the inner housing by the
The inner housing member I2 is also prefer
numeral I2.
ably made of steel, being formed out of 2. rec
The housing includes a top plate I3 and a
bottom plate I4, these plates ‘serving to close the 55 tangular sheet, which has punched in it a mul-‘
"\‘tiplicity of relatively small holes 24, the holes
washers 3I'—33 so as to prevent the passage
being staggeredvertically and arranged in regu
larly spaced relation to each other circumferen
around the ends of any un?ltered liquid.
The galvanized wire cloth is adapted to main
tially of the cylindrical member I2.
The ends ‘of this rectangular sheet of metal
are also soldered, brazed, or welded together to
form a cylinder of sui?cient size to ?t on the ‘
tain the gauze in the desired shape and to pre
vent its local collapse, while the inner housing I2
is adapted to be engaged by the inner‘ easy bends
36 when the ?ltering unit is under pressure, to‘
cylindrical portion I'5 of the bottom plate I4 and
prevent the collapse of the unit from its gener
on the cylindrical surface 25 of the ?ange 26,
ally cylindrical form.
which is carried by the tubular member, 2 I.
While the easy bends 36 are shown out of con
The inner housing I2 is also soldered, welded,
tact with the inner housing I2, they may be
or brazed to the ?ange 26, and this inner hous
forced into contact with the inner housing when
ing is adapted to serve as a tension member as
the gauze becomes partially ?lled and it is sub
well as a conduit. Its tubular portion 2| is pro
jected to apredetermined amount of pressure.
vided with external threads 21 adapted to engage 15 This pressure acts radially and tends to cause the
with the inner threads of the standard nipple
resilient sinuous ?ltering unit to contract with its
28, which serves as a nut and as an extension
folds closer ‘together so that it has a smaller in
of the conduit 29 inside the ?lter.
ner diameter engaging the inner housing I2.
Annular spaces 30, 3I in the lower plate I4 and
Due to the use of a metallic gauze as the ?lter
upper plate I3 are preferably provided with one 20 ing unit, the present ?lter may be cleaned and
or more wool or cotton felt washers 3 I , 32, and 33,
used over again practically an unlimited number
These washers are adapted to engage the ends of
of times by merely reversing the ?ow temporarily
the ?lter unit 23 and the ends of the outer hous
during a cleaning operation; and due to its shape
ing II to provide the end plates with a resilient
and structure the present ?lter has a greatly in
clamping action and to seal the ends of the ?l 25 creased effective ?ltering area over the devices of
tering unit 23 against the passage of un?ltered
the prior art. This gives it a much greater e?i
ciency for the same size ?lter unit than is evi
The washers 3I‘--33 have a frictional ?t in the
denced by the prior art devices.
annular chambers 30, 3| so that they are adapted
The present-?lter is simple in structure and easy
to remain in place until removed by means of a 30 to assemble so that it may be manufactured at
a low cost, and it thus provides a better ?lter at
The ?ltering unit 23 preferably consists of a
a lower cost than any of the devices of the prior
layer or frame of galvanized wire cloth 34 located
inside a second layer 35 of ?ltering material, such
The assembly of the device will be apparent
as bronze wire gauze of very ?ne mesh, such as,
from the foregoing drawings. The inner housing
for example, 100 meshes to the square inch.
I2 is permanently attached to the bottom plate M,
The galvanized wire cloth may be relatively
as described, and to the upper tubular member
coarse, such as for example, eight meshes to the
2|. The washers 3|’, 32' may be placed in the
inch more or less, and the gauze is supported and
bottomlplate I4, and the ?ltering unit 23 may be
reinforced by the wire cloth, which provides a 40 slid over the inner housing I2. The outer hous
stiff form for the gauze.
ing may then be slid over the ?ltering unit into
The ?ltering unit is preferably substantially of
the same length as the outer housing I I, so that
both the ?ltering unit and the outer housing may
be clamped simultaneously between the upper felt
washer 33 and the lower felt washers 3I’, 43’ by
the end plates I3, I4.
The shape of the ?ltering unit in plan is that
it is generally cylindrical, but the outline of the
gauze and wire cloth in plan is that it is radially
synclinal or» sinuous, being formed with‘ a p;u
rality of easy bends 36 on the inside and all at the
same radius, and a plurality of easy bends 31 on
the outside, all located at substantially the same.
radius, and these bends are connected by the
radially extending portions 38.
The ?ltering unit may be made out of a long
the recess 30 of the bottom plate I4, and then the
top plate may be placed over the tubular mem
ber 2|, the top plate having been previously pro
vided with its felt washer 33.
The length of the tubular member 2I is such
that there is a threaded portion projecting for
engagement with the nipple 28, which serves both
as a nut and a conduit. When the nipple 28 is
threaded home, it places the inner housing I2 un
der tension and drives the upper plate I3 against
the ?ltering unit 23 and the outer housing II to
clamp them between the felt washers of the upper
and lower end plates. _
The ?ltering unit may be formed by utilizing
a'plurality of rods set in a base to engage inside
rectangular sheet of galvanized wire cloth, to
the easy bends 36, 31, and the assembledgalvan
ized wire and gauze may be bent about these rods
which there is applied a sheet of practically simi
as the rods are put in place, until the sinuous
lar length of bronze gauze, which is wider, so that 60 member of su?icient length has been formed.
the upper and lower edges of the gauze may be
Referring to Fig. 6, this is an elevational View
folded over at 39 and 40 and soldered to the wire
in partial section, showing one mode of arrang
cloth, if desired. As a matter of fact, after the
ing the ?lter in a housing so that it may be inter
wire gauze and its galvanized wire cloth frame
posed in a pipe line. In this embodiment 40 1n
have been bent to the sinuous and generally cy
dicates the housing in its entirety, which is pro
lindrical form, the gauze is permanently an
vided with a lower half 4| and an upper half 42
chored on the galvanized wire frame, and it is only
of substantially cylindrical shape, the two halves
' necessary to solder together the abutting or over
being provided'with ?anges 4'! by means of which
lapping ends of the gauze and wire mesh, where
they may be joined to form a liquid-tight hous
they join, to form the generally cylindrical form, 70 ing, A suitable gasket is preferably interposed
as for example, at one point in the circumference
between the flanges 41,
of the ?ltering unit.
The lower half housing is preferably provided
Although the ends of the ?ltering unit are sinu
with'a threaded inlet conduit 50 and a threaded
ous-and irregular, the free edge surface of the
outlet conduit BI, and with a suitable threaded
?ltering unit is adapted to be engaged by the felt 75 lower dischargesopening for receiving a clean-out
plug or a valve 5|. By providing the pipes which
connect to the conduits 50, 5| with suitable turn
of! valves,.the assembly may be isolated in any
system, and sludge may be cleaned out of the
bottom of the housing by means of the valve 54
and by removing the plug 49 at the top, if neces
Another mode of cleaning out the loose sludge
is to ?ush it out by applying suitable ?ushing
of tubular shape threaded to be engaged by a
tubular threaded member, a substantially ?at
annular metal member having an inwardly ex~
tending cup-shaped cylindrical formation re
ceived in and secured to said core and havins
a radially extending ?ange for supporting a gas
ket, said radially extending ?ange also carrying
an inwardly turned cylindrical retaining ?ange,
a similar metal member for the opposite end of
10 said ?lter, comprising an annular member hav
liquid/at any one of the conduits or openings.
ing an inwardly extending cup-shaped depression,
The two half housings are held together by a
a ?at annular ?ange for receiving a gasket and ,
pair of bolts 45, each bolt being pivoted at 44 by
bearing ?anges 43 carried by the lower housingr
an inwardly extending‘ cylindrical retaining
?ange, said latter ‘cup-shaped member having an
half M and each bplt being provided with a wing
aperture to receive the threaded tubular portion
nut 46“ for engaging above the?anges 41, when
of said ?tting, a ?lter unit of stiff characteristics
the bolts are located in the slots 48.
adapted to resist compression as a column, said
The ?lter unit may be supported in the hous
?lter unit being interposed between the gaskets‘
ing and connected to the outlet conduit 5| by a
of the ?rst cup-shaped member and the second
short section of pipe 53, threaded in the outlet
5|, and provided with an elbow 52, the upper end 20 cup-shaped member and clamped between said
gaskets» by means of said tubular threaded mem->
of which is threaded into the collar 28 for sup
her, said ?lter unit comprising a sinuous support
porting the ?lter unit I!) in upright position in the
ing frame of stiff wire mesh and a-layer of line
housing 40.
?ltering wire gauze extending over said wire mesh
It will thus be observed that I have invented
an improved ?lter which is simple, economical to 25 on one side thereof and folded over at the ends
of said wire mesh for securement to the wire mesh,
manufacture, sturdy, and highly emcient for its
said wire mesh forming a unit of substantially
size. The present device has very few parts, and
cylindrical shape with sinuous bends and radial
may be assembled very easily by unskilled labor.
portions extending inward and outward.
While I have illustrated a, preferred embodi
3. In a ?lter, the combination of a centrally
ment of my invention, many modi?cations may be 30
' made without departing from the spirit of the
invention, and I do not wish to be limited to the
precise details of construction set forth, but de
sire to avail myself of all changes within the
located housing adapted to receive ?uid passing '
through the ?ltensaid housing being perforated
at spaced points from end to end and about its
periphery, a pair of cover plates, one of said cover
35 plates having a cylindrical formation adapted to
scope of the appended claims.
be received in said housing and secured thereto
Having thus described my invention, what I
and having a radially extending ?ange and a
cylindrical border ?ange and forming an annular
groove at one end of the ?lter, the other of said
1. In a ?lter, the combination of a substantially
cylindrical central core member of apertured 40 cover plates being movably mounted upon a cylin
claim as new and desire to secure by‘ Letters Pat
ent of the United States is:
sheet metal, said core member being provided
drical threaded member carried by said housing,
upon its upper end with an annular metal ?t
and being likewise formed with an annular groove
facing the first-mentioned groove, both of said
ting of tubular shape threaded to be engaged
grooves being provided with compressible, ?brous
by a tubular threaded member, a substantially
?at annular metal member having an inwardly 45 gasket members adapted to serve as a seal at the
ends of a ?lter element and to ?lter such leakage
extending cup-shaped cylindrical formation re
ceived in and secured to said core and having a
as may pass through them, and a ?lter unit, the -
said ?lter unit comprising a frame of coarse wire
radially extending ?ange for supporting a gasket,
of substantially cylindrical shape but having in
said radially extending ?ange also carrying an
inwardly turned cylindrical retaining ?ange, a 50 wardly and outwardly extending radial sinuous
bends joined by easy curves, the said frame of
similar metal member for the opposite end of said
inwardly extending cup-shaped depression, a, ?at
coarse wire being covered by a ?ne Wire gauze
extending from end to end of the frame and
annular ?ange for receiving a gasket and an in
being secured by being bent about each end of
?lter, comprising an annular member having an
wardly extending cylindrical retaining ?ange, 55 said frame, and an outer perforated housing
said latter cup-shaped member having an aper
ture to receive the threaded tubular portion of
said ?tting, a ?lter unit of stiff characteristics
adapted to protect the gauze and to keep from the
?lter the coarse material which would otherwise
engage the gauze, the said ?lter unit and outer
housing both being engaged by said ?brous gas
?lter unit being interposed between the gaskets 60 ket members in said annular grooves to prevent
the passage of ?uid without ?ltering, and said
of the ?rst cup-shaped member and the second
outer housing and frame being placed under com
cup-shaped member and clamped between said
pression by a second threaded member engaging
gaskets by means‘ of said tubular threaded
said movable plate and threaded on said ?rst
2. In a ?lter, the combination of a substantially 65 threaded member to place said ?rst-mentioned
housing under tension to effect assembly of the
cylindrical central core member of apertured
sheet metal, said core member being provided
upon its upper end with an annular metal ?tting
- adapted to resist compression as a, column, said
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