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Патент USA US2404621

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July l23„ 1946.`
Filed March s1, 194s '
Patented -ÍuÍy 23, 1946
2,404,621 ' f
x Ernest vW. Davis, River Forest, Ill., assignor to
Stewart-Warner Corporation, Chicago,> . Ill., a
corporation ofvVirginia l.
Application `Maren 31, 1943, -serial N9. 481,221
f 4c1aims. (o1. 21o-_166)
My invention relates to strainer , and more
particularly to strainers for separating particles _
E, and an outlet 8, with a grease passageway I0,
extending from the `inlet 6, to the outlet 8. The
cylindrical portion I2 is bored at each end to re
ceive a loosely fitting screening element I4, `hav
ing end pieces I6 and I8, held in position by the
connecting rod 2l) which serves to hold the cylin-V
drical screening member from collapsing longi
yof foreign matter from grease discharged into a
high pressure grease line, leading to a plurality
of metering devices in a centralized` lubricating
system adapted to proportion the ñow of grease
to a, plurality of bearings. The prior art dis
closes many such centralized lubricating systems,
, tudinally. The openings 22, 22 in th'e end piece
I6;v permit the passage of greaseV to the interior
vfor which the strainer of this invention is well
10 of the screening element I4.
The necessity for such a, strainer is obvious
when it is considered that practically all com
The passageway I Il includes a port disposed be
tween the inlet and the outlet and controlled by
a sphericalcheck'valve 24. The spherical valve
mercial lubricating .greases co'ntain particles of
lint, scale, grit, libres, and other extraneous sub
24 is normally held off the valve seat 26 by the
stances, the adverse inñuence of which may pre 15 end thrust of the connecting rod 20, which is
vent continued successful operation vof the afore
urged in Va direction towards the valve 24 by
said metering devices. Unlike oil, grease does
means ofv the compression spring 28. The
not permit such impurities Vto settle by the action ' screening element I4,.and spring 28 are assem
`of gravity, and as the methods of handling grease
wbled in` the body memberllA through the threaded
are generally less >conducive to cleanlinessl than 20 opening 30, which isA then closed by the remov
the methods ordinarily used in dispensing oil, the
able „closureplug 32. The valve 24 is assembled
necessity of installing a strainer in a grease line
in the body member 4 through the threaded open
is quite obvious.
ing 34A which is then sealed by the removable
The strainers heretofore used for this purpose
closure plug.36.
-' '
vcomprise a hollow body member containing a, wire 25
screen., The body member is often supplied’with
<a removable. plug to facilitate convenient removal
of the screen when cleaning is necessary. Such
The operation of- this strainer is as follows: ,
Grrease- ñowing through the inlet 6 passes around
the valve 24,*through the openings 22, 22, into
the screening element I4, through the interstices
of the screening element I4 and out through the
strainers are quite satisfactory if they are cleaned
before they become clogged with impurities, but 30 outlet 8. ' Particles _of foreign substances in the
in actual practice they are usually neglected..
grease are separated from the grease as it passes
Then when the screen becomes cloggedwith irn
through the _screening element I4, so that grease
purities, thevhigh grease pressure, which may be
discharged through the outlet 8 is relatively clean.
thousands of pounds per square inch, bursts the
After longA continued service the screening ele
screen and .allows the accumulated mass of im
purities to travel along with the ñowing grease
to the metering devices, which' then become in
35 ment I4 may become clogged with the aforesaid
particles', whereupon the differential grease'pres
sure across the screening element I4 causes the
The principal object of this invention is to pre
.entire screening element I4 to move downwardly
.vent this objectionabley bursting of the screen. 40 and towards'the right, thereby compressing the
spring 28, and thereby permitting the valve 24 to
This object is accomplished by incorporating a
close against the valve seat 26, so as to prevent
valve in the body of the strainer, which Valve is
in series with the screen, _and by providing means,
operative upon partial clogging of the strainer,
for closing the valve.
Referring to the drawing:
further passage of grease through the screening
element Í I4. Since greaseis» a relatively viscous
fluid it will tend to carry the valve 24 toward its
seatV 26 even though the strainer body be inverted
with respect to the position in which it is shown
in Figs. l and 2.
Figure 2 is a sectional side elevation of th‘e
The ~degree of clogging of the screening element
same, the section being taken on the line 2, 2, in 50 I4 which will cause the valve 24 to close, will,
Figure 1; and
of course, depend upon a number of factors, but,
Figure 3 is a similar section of a modiñed form
in ultimate analysis, the valve 24 will close when
of the strainer shown in Figure 2.
the differential pressure on the opposite sides of
The body member 4 is preferably constructed
the end piece I8 is sufficient to compress the
of air furnace iron, and is provided with an inlet 55 spring 28 to the extent ’necessary to remove the
Figure 1 is an end elevation of the strainer of
this invention;
an end wall on the other end of said screening
` In practical use of the invention the spring 28
element, means extending rigidly from said
Ul screening element into engagement with said
will be made suñiciently strong to hold the valve
24 open until the screening element I4 is sub
stantially clogged, that is, when so many of its
valve and serving to hold the valve open at one
limit of movement of said screening element, and
interstices are plugged with foreign _matter that
the lubricating apparatus in which the strainer
spring means urging Asaid ‘element tóward. said
is incorporate-d has its `grease ñow rate notice
ablyreduced due to the increased resistance toV
grease flow through the strainer. It will be noted
that the portion of vthe bore through the cylinf->
now ofA fluid from the inlet toward said screening
element and seating in the direction of said ñow,
end of the rod V20 as an obstruction to the seating
of the valve.
3. In a strainer device, the combination of a
body member havinginlet and outlet openings
' adapted for connection with conduit means, said
drical portion l2 is in free Vcommunication with
body member havingua bore extending at an angle
to YVthe axis of Ysaid outlet withV one side of said
Vthe outlet opening 8 through a hole 31.
When this strainer is usedv in a hand operated - fbbre open vto -said outlet andwith a port atene`
vend of the bore opening to the inlet, a screening
_ greasing system, th’e inability of thev operator to
force grease through the systemnotiñes himthat , ,element Vhaving apervious cylindrical wall dis
the strainer is clogged and needs cleaning.
In the embodiment illustrated in Figure 3,-av
semi-spherical valve 38 yis screwed on the con
nectingv rod '23. The operation of this strainer is
posed in said bore, the bore providing guide means
for 4limited movement of the screening element in
the'same as that kof the >strainer illustrated in
inlet through said port,„sa'i`d fluid’l being.' :dis-V
charged to the outlet through said pervious wall
of the -screening element, a valve seat at said port
the direction of its axis, one end of said screen
ing element'bein'g open to receive Vfluid from the
Figure 2,'except that the valve 38 is closed by the
~ connecting rod 20„instead of being closed by Y
movementfoi` the grease. Y
and -a valve cooperating therewith to control the
ñ‘o‘w of fluid vfrom said inlet toward said outlet,
said valve seating in the direction of ñow toward
the open endbf the screening element, an end
wall on the otherend of said screening element,
means extending rigidly from said end wall into
Without. furtherÁ elaboration, the foregoing will
. so fully explain my invention that others may, by
applying knowledge ¿current at „the time of appli
cation, readily adapt the same for use under vari
ous conditions of service.
I claim:
' '
engagement with said valve and serving to hold
the valve open at one limit of movementy of said
l. In a strainer device, the combination of a
body member having inlet and outlet openings
screening element, spring means-urging said ele
with a passage .connecting them for flow of 'fluid
from said outlet to said inlet, said passage in- 1.,
ment toward said limit, and a plug closing one
end of said boreand removable to permit removal
cluding a port, a valve seat around said Dort, a
check valve movable 'inthe direction of flowto
engage said seat and close the port, »a screening
of the screening element.
y ~
„ 4. Ina strainerrdevice, the combination of a
body member having threaded inlet and outlet
openings in' v'substantiallyV ax-ialY alignment and
element interposed in thelpassagevbetweensaid
having a boreextendin'g at an angle to the com
check valve‘and the outlet and slidable toward
and from said port, spring means urging the
mon axis of said inlet and outlet, said bore having
screening element toward the port, and means
one side open to the outlet and having a port' at
extending from said screening element into en«
gagement with the valve and operative to hold
one end opening to the inlet, a screening element
including a pervious cylindrical wall disposed in
that the pressure of fluid entering at the inlet is
ininthe direction VofV its axis, a valve seat at said
port andy a valve cooperating therewith to control
now of'iiuid from said inlet toward said outlet,
said valve seating in thevd-irection of flow,~the
Y the valve open until -the screen becomes so clogged p. ‘ said bore and guided for limitedl movement there- ,
sufficient to Ymove the screening element away
from the port in opposition to said spring means.
V2. Ina strainer device, the combination of a
body member having a flow passage for ñuid ex
end 'of said'screening element `toward the port
being _open to receive fluid from the -inlet'and
said liuid being discharged through said pervious
tending through it, with inlet and outlet openings
respectively at opposite ends of said passage' and
in substantially axial alignment, a screening ele
ment having a pervious cylindricall wall and dis
posed with its axis at an angleY tothe common
axis of said inlet and outletfone end of said
screening element being open to' receive fluid
from the inlet-end Vof the passage and said fluid
being` discharged through said pervious wall of
the screening element into the passage and
toward its outlet, guide means in said body mem
ber in which the screening element isfmounted
for limited movement in the direction of its axis,
a check valve in the passage and a seat therefor
disposed adjacent the lopen -end of the screening 5615
element, said valve ybeing adapted'tó control the
Wall of the screening element to the outlet, means
extending ¿rigidly from said screening element
into engagement` with the valve andfserving'to
hold thevalve openrat one limit of movement
>of said screening element, a threadedplug clos
ing one end ofthe bore, a- spring reacting between
said plug and >the screening element urging _said
element toward said limit of its movement and
normally holding the valve- open, the removable
threaded plug being dimensioned to permit re
moval of the spring and rscreening element‘from
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