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Патент USA US2133004

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oct. 11, 193s.
Filed Aug. _11, 1936
` `Z9
_ 24M
, A
Patented Oct. ll, 1938
l 2,133,004
Lewis W. Williams, 'short mus, um Georxe a.
Arnold, Chatham, N. J., assignors to Motor
Improvements, Inc., Newark, N. J., a corpora
tion of Delaware
Appuœuon am» 11, 193s, sei-m No. 95,33»
somma. (Otero-_169)
'This invention relates to filters and more’ es- ' between vvthem is passed a wire W which is
pecially to metal ribbon filters of the type dis
pressed into a ribbon R and given a predeter
closed in the patent to R. P. F. Liddell, No. mined curvature as described in said Liddell pat
2,042,537. The filter disclosed in said Liddell ent, No. 2,042,537. The operating face of the roll
5 patent comprises a helix of metal ribbon hav
I0 is provided with minute depressions while the
ing contacting turns, the flltering interstices operating
face of the roll Il is of glass-like
being provided through the medium of trans
smoothness. The minute depressions in the face
verse ribs formed on one face of the metal rib
of the roll III are produced by projecting against it
bon. The proper curvature is given to the rib
'_sand grains of definite size at a predetermined ve
bon and the transverse ribs are formed thereon
The sand grains produce microscopic de 10
by passing the ribbon between conical pressure locity.
pressions and the depth of the recesses thus
rolls, one of which is provided with a series of
formed is regulated by selection of the size of the
slots which result in the formation of the ribs. sand
and control of the projection velocity.
An object of the present invention is a ?lter 'I‘he grains
ribbon R is therefore produced with one
of the type above described having extremely surface
glass-like smoothness and with its ll
minute filtering interstices whereby it is capa-_ opposite of
surface having minute ,projections and
ble of filtering out> the most minute particles.
may be indistinguishable by the human eye and
The minute spacing of the turns of the helix is be visible only through the medium of a micro
attained by the use of specially prepared pres
scope. 'I'he ribbon R is formed into a helix as
sure rolls in the operation of shaping the rib
bon. One of the pressure rolls is formed with a described in said Patent No. 2,042,537 and when
suitably mounted constitutes a ñltering element
surface of glass-like smoothness while the other capable
removing the finest of particles from
pressure roll is sand-blasted with sand grains of a liquid. of'I'he
minute projections on the one face
a definite size projected at a predetermined ve
25 ~1ocity. By selection of the size of the sand contact the glass-like surface of the other face,
insuring uniformity of filtration through- u
grains and control of the velocity of projection, thereby
the entire surface of the filtering element.
the depth of the recesses formed in the pressure out
The provision of one surface of glass-like smooth
roll can be accurately regulated to produce pro
ness prevents any possibility of variation in the
jections on the ribbon ofthe desired height to ñltering
yield filtering interstices of the desired size. The ribbon. interstices throughout the length of
resulting projections on the ribbon may be made
microscopic in size and form filtering interstices tering ,element to illustrate the general subject
of the same order of magnitude.
Other objects, novel features and advantages matter of the filtering element and its arrange
of this invention will become apparent from the ment while in Fig 4 is illustrated the difference 35
betweenthe two faces of the ribbon R. In Fig.
following speciñcation and accompanying draw
4, the lower fragment is from the upper portion
ing, wherein:
- Fig. 1 is a plan View of a pair of pressure rolls >
of a turn of the ribbon R while the upper frag
ment is from the lower portion of the next turn
‘for forming the metal ribbon of which the filter
'of a ribbon R. The upper surface of the lower
‘0 ing element ofthe present invention is com
fragment is _provided with the minute projections 40
which denne the> filtering interstices while the
Fig. 2 is a side elevation thereof;
Fig. 3. is a fragmentary perspective view of a o lowerv surface of the upper fragment is of the
glass-like smoothness previously mentioned.
filtering element embodying the invention;
InßFigs. 5 to 7, 20 is a illteringfelement com
Fig. 4 is an enlarged fragmentary section on
a helix composed of ribbon produced in 45
the line 4_4 of Fig. 3;
accordance with the previously described pro
Fig. 5 is a vertical section through a. ñlter'hav
cedure and having the surface characteristic re
ing a ñltering element embodying the invention; sulting
from such procedure., 'I'he helix 20 is
Fig. 6 is a similar view with the filtering ele
0 ment slightly extendedlfor cleaning;
Fig. 7 is a section on the line 1- of Fig. 6,
Fig. 8 is a section on the line 8_8 of Fig. 6.
In Figs. 1 and 2, a pair of pressure rolls are
5 driven by any suitable means (not shown) and
mounted on av frame 2l which consists of two
cross metal _strips suitably inter-connected. To 50
one end of the frame 2| is ilxed a head 22
against which abuts one end of the helix 20. 'I'he
other end of the frame is recessed at 23 and
into this recess projects the hub 2l of a cap 25
having a flange 26 overlying the end of the
irame, the cap lbeing capable of sliding move îthe pressure within the ñltering element and
ment on the frame toward and away from the tdifferential tends to move the cap 25îtowards
carp 22. A spider.; or retainer 21 is carded by
the ends of the strips which form the trarne 2|
the cap 22. -
We claim:
l. A ñlter comprising a helix of metal ribbon 6
s the acts as a guide for the hub 2e. Alsofwith
in the recess 23 is a spring 28, one end of which "having contacting turns, one face of said ribbon
is attachedto the i'ramfand the other end o! being smooth and the other face being provided
which is attached to the cap 2% through thev with microscopic projections produced from pres
medium of a yoîae 29 and bolt 30. 'I'he illter > sure applied thereto by a sand-blasted surface.
2. Aî iilter comprising a frame. and a metai l0
10 element is arranged within a casing 2| having
an inletÍl2, the casing being provided with a î ribbon helix supported by said irame„one face
cap 32 having an outlet 2l communicating with of said ribbon Ybein/g smooth land the other tace
A apertures 25 in the cap 22.
In operation, liquid to be ñltered is introduced
being providedwith irregularlyi arranged micro
acopio projections of varying height defining
into thecasing through -the _inlet I2 andV passes .i minute interconnecting tortuous channels of
inwardly through the interstieesfin the helix 20 Y varying depth betweerradiacent turns irom one
side of the heiix to the other.
into the interior thereof from which itis dis
charged by wayioi the apertures I! through the
outlet 34. 4Cleaning ofthe filter is eiiected'by
l0 reversirgg the ilow oi liquid; thereby establishing
3. VA,-iilter according to claim 2 in which said»
other?V surface has the reverse characteristics oi
a sand-blasted surface.
4. A ñlter comprising a frame, a metal ribbon
a pressure differential between the interior andi
.Y exteriorV o! the iiltering element. 'll‘hislpressuz‘e'? helix supported by said frame, one face oi said
'.diñerential causes the cap 25 to move îrom the . ribbon being ?smooth and the other face being
lposition shown -in Fig. 5 to the position shown .provided with irregularly arranged microscopic
projections oi varying height'deiining?minute in- 25
ß in Fig. 6 and permitting corresponding ,expan
V?sion of the helix withY resulting slight spacing terconnecting tortuous channels of varying depth
of the turns. The outward ilowoi liquid through between adjacent turns from one side o! the helix
the turns washes out any deposit ot filtrate and
cleans the ñlter. As soon as the pressure difier
86 entiall-?betweenV the interstices and the exterior
of'the'ìilter is removed, the spring 28 returns tlf-¿e
to the other, a cap for each end oi said helix,
andîresilient means urging said caps toward each
5. A ?lter according to claim 4
1 cap 25'Y to its original position, thereby causing
other surface has the reverse characteristics of
0f the
again to be
î contact. The turns remain
contact during
a sand-blasted surface.
Iâ normal operation oi the iilterïsince the pressure
'exterior oi’ the filtering element is greater than -
which said
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