Title:
Liquid purifier
United States Patent 2381141


Abstract:
This application is a division of the application of John K. Russell for a "Filter housing," Serial No. 392,888, filedMay 10, 1941, issued November 9, 1943, as Patent No. 2,333,890. My invention relates to a liquid purifier and finds particular utility when used in the oil circulating system...



Inventors:
Russell, John K.
Application Number:
US42432241A
Publication Date:
08/07/1945
Filing Date:
12/24/1941
Assignee:
LUBER FINER INC
Primary Class:
International Classes:
B01D27/02
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Description:

This application is a division of the application of John K. Russell for a "Filter housing," Serial No. 392,888, filedMay 10, 1941, issued November 9, 1943, as Patent No. 2,333,890.

My invention relates to a liquid purifier and finds particular utility when used in the oil circulating system of an internal combustion engine, and an embodiment of my invention well adapted for such use is hereinafter described.

In constructing a container/and cover for a purifier element for such use it has been customary to make the container or housing of comparatively thick metal to provide for a threaded connection between the. cover and container of sufficient strength to clamp the cover very firmly upon the container; One the obect of my invention is to provide a purifier in which the container for the purifier element may be stamped from sheet metal of a thickness sufficient to resist the fluid pressure 2( in the oil circulating system, but insufflcient\thb permit the threading of the cover to the container or to provide the rigidity required for firmly clamping the cover to the housing in accordance with the prior practice. More specifically, it is 2 an object of my invention to provide a purifier which includes a thin walled container for the purifier element, together with means for locking or compressing the cover on the container so that the cover may be quickly and easily removed 3 therefrom. My invention contemplates the provision of such a clamping or locking means formed of few parts, which are substantially concealed within the container when the cover is locked thereon, so that such parts need not be 3 finished or polished.

Another object of my invention is the provision of a purifier including a container for the purifier element, -which container has thereon exterior connections for inlet and outlet lines facilitating 4 the installation and the removal of the purifier in the oil circulating system of an engine.

Another purpose of my invention is to provide a purifier including a container for the purifier element having therein means for mounting the purifier element and retaining it in proper position during use and permitting quick removal and installation of the purifier element within the container.

Another object of my invention is the provision of a purifier of the class described which includes a purifier element with means thereon facilitating the rapid attaching of the purifier element to and its removal from a housing or container. It is also an object of my invention to'provide a cylindrical purifier element for such a device, in which the paths of travel of the oil therethrough are radial of the element, while avoiding the use of a central oil pipe extending throughout the length of the element.

Among other-objects of my invention Is the provision of a purifier, such as described, which is inexpensive in manufacture, compact and pleasing in appearance, and positive in operation. An embodiment of my invention capable of performing the objects and providing the advantages stated is illustrated in the accompanying drawing, in which Fig. 1 is a vertical sectional view; Fig. 2 is a sectional view taken as indicated by the line 2-2 of ig. 1; Fig. 3 is a fragmentary sectional view taken as indicated by the line 3-3 of Fig. 2; Pig. 4 is a fragmentary perspective view of the I inner surface of the upper portion of the container; and Fig. 5 is a perspective view of the tension-transmitting member used in this embodiment of my invention.

Referring to the drawing, which is for illustrative purposes only, the numeral II indicates a complete purifier of my.invention which includes a housing, shell, casing or container 12 and .a cover or closure member 13. The container 12, 0 which is circular in cross section, includes a side wall 14, a.bottom or end wall II, and a downwardly converging wall 'Itconnecting the side wall 14 and bottom wall 1I.

Formed in the container 14 near its upper end 35 is an Inwardly extending projection or. rib II1 substantially semicircular in cross section and extending completely around the container 1l.

Formed in the bottom wall II of the container 12 is a central opening 18 and two openings f9S 40 and 20 spaced from the central opening 18,. the axes of the three openings being in the same plane. Positioned upon the inner side .of the bottom wall 1 is a reinforcing member or plate 21, which may be provided with upwardly projecting 45 flanges 22 along its edges for increasing Its rigidity. The reinforcing plate 21 Is provided with an opening 23 registering with the opening 18 in the bottom wall IS. Also formed in the reinforcing plate 21 are openings 24 and 25, both of which are 50 threaded and which register with the openings II and 23, respectively, in the bottom wall IB.

An inlet boss 28 includes a reduced portion 21 threaded into the opening 24 in the reinforcing plate 21 and an enlarged portion 28 separated 55 from the reduced portion 21 by an annular shoulder 29. A gasket 30 is clamped between the annular shoulder 29 and the outer surface of the bottom wall 15 when the reduced portion 27 is threaded into the opening 24. The inlet boss 26 is provided with an axial liquid passage 31, a threaded opening 32 communicating with the passage 31 and formed in the enlarged portion 28.

The numeral 33 indicates an outlet boss having an inner reduced threaded portion 34 and an enlarged portion 35 separated by an annular shoulder 36. The reduced portion 34 is threaded into a cavity 37 in a connecting sleeve 38 in the container 12, so that a gasket 39 is compressed between the annular shoulder 36 and the outer surface of the bottom wall 15. Formed in the lower end of the enlarged portion 35 of the outlet boss 33 is a threaded cavity. 40 communicating with an axial liquid passage 41 extending to a small opening cr orifice 44 in the inner end of the outlet boss 33 and communicating with a liquid passage 42 provided in the connecting sleeve 38. The connecting sleeve 38 includes an upper reduced threaded portion 43. The outlet bcjs 33 is not threaded to the reinforcing plate 21, but is secured in place by its threaded engagement with the connecting sleeve 38 inside the container 12. The boss 33 and sleeve 38 provide a duct providing a passage from without the bottom wall 15 to a point well within the container 12.

Securing the reinforcing plate 21 against movement relative to the bottom wall 15 is a bolt 45 threaded into the opening 25.in the reinforcing plate 21 so that its head engages thie lower surface of the bottom wall 15. The removal of the bolt 45 provides an outlet drain through openings 20 and 25.

Positioned within the container 12 adjacent the upper edge of the side wall 14 is a first engaging shoulder means or member or ring 46. The ring 46 may be formed in a complete annulus or a substantially complete annulus of a ribbon of sheet iron, for example, of a thickness substantially greater than the thickness of the container walls 14, 15, and 16 and sufficient to transmit over substantially the entire circumference of the 4 side wall 14 the force involved in securing or clamping the cover 13 to the container 12. The ring 46 may conveniently be stamped to the desired shape, as best illustrated in Figs. 1 and 4, which includes upper and lower vertical legs 47 g and 48, respectively, portions 49 and 50 extending inwardly from the adjacent extremities of the legs 47 and 48, respectively, and a central vertical portion 51 extending between the portions 49 and 50. Formed in the ring 4I is a plurality of bayonet slots 52. illustrated in the drawing as three in number, each including a vertical entrance opening 53 formed in the inwardly extending portion 49 and central vertical portion 51 and communicating with a circumferential opening 54 formed 61 in the central vertical portion 51.

The ring 46 is formed so that it may be installed in the upper portion of the.container with the lower edge of the lower leg 48 thereof supported upon the inwardly extending rib 17 of the 6 container 12, and the outer surfaces of the vertical legs 47 and 48 engaging the inner surface of the vertical wall 14 of the container. The vertical wall 14 is then bent inwardly over the upper edge of the vertical leg 47, as indicated by 7C the numeral 55, and inwardly against the inner surface of the upper vertical leg 47, as shown by the numeral 56, thus securing the ring 46 in place within the container 12.

A second engaging means or member or ten- 75 sion-transmitting means is provided in the form of a spider or spanning member 57, which includes a central portion 58 and three projecting radial legs 59 extending therefrom. Each of the 6 legs 59 has an upper surface 60 curving outwardly and inwardly and a horizontal lower surface 61, and is provided at its extremity with an engaging portion 62 of dimensions to pass through the entrance opening 53 and along the circumferential opening 54 of any one of the bayonet slots 52.

The central portion 58 is provided with a threaded opening 63 extending vertically therethrough.

The spider 57 may conveniently be cast of iron and requires no polish or finishing, since it, like the ring 46, is concealed within the container.

The cover 13 is formed of metal of a thickness greater than the walls of the container 12 and sufficient to resist the compressive forces resulting from clamping it to the container and is proio vided with a central dished portion 64 having therein an opening 45 through which a tension member or bolt $6 is extended and threaded into the opening 63 of the spider 57, clamping a gasket 67 against the outer surface of the cover 13 adjacent the opening 65. The cover 13 may be conveniently shaped by a stamping operation.

A purifier element or cartridge assembly within the container is indicated by the numeral 68.

The purifier element 18 includes top and bottom imperforate plates or walls 69 and 70, respectively, the peripheral edges of each of which are formed U-shaped in cross section to embrace the ends of a cylindrical wall member II. The cylindrical wall member 71 is provided with a plurality of openings 72 therein, which may be conveniently formed by slitting the wall of the element 68 and pressing tl* portions adjacent the slits outwardly to provide inclined baffles 73.

The bottom wall 70 of the purifier element 68 is provided with a central opening 74, registering with a central opening of a cup 75 and a central opening of a lower cap 76. The bottom wall 70, cup .75, and. cap 78 are clamped together between an annular shoulder 77 and an outwardly directed end flange 78 formed by upsetting or swaging the end of an inlet sleeve 79 extending through the registering openings.. Projections 77a are formed on the lower surface of the shoulder 77 and extend through radial openo ings in the'bottom wall 70, cap 76 and cup 75, thus securing the clamped assembly against relative rotation of its parts. Similar projections 77b are formed on the upper surface of the shoulder 77. The inlet sleeve 79 is provided with in5 terior threads for reception of the reduced portion 43 of the connecting sleeve 38.

The. numeral 80 indicates a conduit or liquid collecting means or member positioned axially of the purifier element 18 and extending upward0 ly in the purifier element.

As illustrated in the drawing the conduit 80 may be formed by rolling into cylindrical form a single layer II of fabric of one or more thicknesses of cheese-cloth or the like and a perSforate metal sheet 82. The fabric layer I8, of lesser width than the perforate sheet 82, is laid upon the perforate sheet, and the two are rolled together so that the perforate metal sheet provides an outer perforate wall 83 and an inner perforate wall 83a with the fabric layer 81 therebetween. The fabric layer I8 is longer than the perforate sheet 82 so that its ends project beyond the ends of the cylinder formed by rolling them together, and these projecting end portions Sof the fabric layer are pressed around the cylinder thus formed. More than one fabric layer and perforate sheet may be employed if desired, the layers and sheets being stacked in alternating relationship and rolled together.

An upper cap 84 is pressed upon the upper end f of this cylinder and the end portion of the fabric layer around the cylinder, and the lower cap 16 with the inlet sleeve 79 is pressed upon the lower end of the cylinder, and the end portion of the fabric layer therearound, thus preventing any 1 severed threads in the fabric layer from passing into the conduit 80 and preventing the perforate sheet 82 and the fabric layer 8I from unrolling.

The cap 16, cup 15, and bottom wall 10 of the purifier element are secured together by upset- I ting the end of the inlet sleeve 19 before the bottom wall 10 is connected to the cylindrical wall member 71.

The metal- walls 83 and 83a are made of a length less than the distance between the top and bottom walls 69 and 10 of the purifier element 68, so that the liquid collecting member 80 terminates below the top of the purifier element 68, and liquid is thus prevented from flowing to the collecting member without passing through the purifier medium around this member, even though such medium should settle and separate a slight distance from the top wall 69. An upper cup 85 may be secured to the top wall 69 with its lower edge extending below the top of the, liquid collecting member 80 to further prevent such unpurified flow.

With the purifier assembled as illustrated in Fig. 1, in order to remove the purifier element 68 and replace it, it is necessary only that the bolt 66 and cover 13 be removed and the spider 57 be rotated until the engaging portions 62 of the spider 57 can be moved in the bayonet slots 52 to the entrance openings 53, whereupon the spider 51 may be removed from the container 12.

Or the bolt 66 may be turned sufficiently to completely release the pressural engagement of the spider portions 62 with the upper walls of the openings 54, and to lift the bolt head somewhat from the gasket 61, after which the bolt may be slightly lifted and at the same time rotated to turn the spider to a new radial position in which it can be freely removed through the open end of the container. The bolt may then be used to lift as an assembly both the cover and spider from the container.

Thereafter by simply rotating the purifier element 68, it may be disconnected from the connecting sleeve 38 and lifted from the container 12. A bail 93 may be swingably mounted iln a ring 94 upon the top wall 69 of the purifier element 68 to facilitate the rotation and elevation of the purifier element 68. The installation of a new purifier element 68 requires only the lowering of the element into the container 12 and the threading of the cylindrical sleeve 19 in its lower end upon the connecting sleeve 38. Downwardly converging, inwardly facing indentations or shoulders 86 are formed in the lower portior of the side wall 14 and in the downwardly converging wall 16 to guide the lower end of the purifier element centrally in the container I during its insertion therein. Indentations, stops or shoulders 81 in the converging wall 16 define seat for the bottom wall 10 of the purifier ele ment 68 when it is installed. As shown in Fig.: when the inlet sleeve 19 of the cartridge assem bly 68 is screwed downwardly upon the threadei reduced portion 43 of the connecting sleeve 3i the peripheral edge' of the bottom wall 10 con tacts the stops 81 prior to and preventing contact of the flange 18 of the inlet sleeve 19 with the large diametered body portion of the connecting sleeve 38. This relationship of the parts i results in the cartridge assembly 68 beingtightly clamped to the casing 12, preventing relative vibration of the cartridge assembly and container and fracture or deformation of the connections therebetween.

0 Thereafter the spider 57 is placed upon the container with the engaging portions passing through the entrance openings 53 of the bayonet slots 52 in the ring 46. The spider 51 is then rotated until the engaging portions 62 pass into .5 the circumferential openings 54 of the bayonet slots 52 to the position illustrated in Fig. 3.

Thereafter the cover 13 is placed on the container and the bolt 66 is threaded into the spider 51, clamping an annular gasket 95 between a periph0t eral flange of the cover 13 and the inturned portion 55 of the container 12, and clamping the gasket 61 between the head of the bolt 66 and the cover 3I. The cover 13 is thus locked in fluidtight relationship with the container 12. The installation of the purifier of my invention in the oil circulating system of an internal combustion engine is facilitated by the inlet and outlet bosses 26 and 33, respectively, which are carried by the container. The reinforcing plate 'n 21 provides the necessary strength to the thin walled container 12 for supporting the inlet and outlet pipes connected to the bosses 26 and 33, and also provides means for threading the inlet boss into the container assembly. The reinforcing.plate 21 likewise provides the required rigidity to the thin bottom wall 15 of the container for supporting thereon the purifier element 68.

This reinforcing plate 21 is securely held in place by its threaded engagement with the inlet boss 26 and the bolt 45.

In operation, the oil entering through the Inlet boss. 26 fills the clearance space around the purifier element 68 within the walls of the container 12 and cover 13. The oil passes radially inwardly through the openings 12 in the cylindrical wall I of the purifier element and through the fabric layers 89 and 90 and the screen cylinder 91 into the purifying material 92 which ,n may be fibrous material. The purified oil passes inwardly through the fabric layer or layers 81 and the perforate metal walls 83 and 83a to the interior of the oil collecting means 80.

The construction of the liquid collecting means 550 eliminates the necessity for a central pipe "extending throughout the purifier element 68 and permits the installation of the purifier element 68 within the container by making only a single connection between them.

The considerable force required to securely 00 clamp the cover 13 in place is transmitted through the bolt 66 and spider 57 to the ring 41 which applies it uniformly to substantially the entire circumference of the thin walled container 12. The construction hereinbefore de- 6 sribed permits the container 12 to be made of S /thin metal, for example, sheet steel of about t 20 gauge, and permits the container 12 to be quickly and inexpensively formed in a stamping 0 operation. The ring 46, as previously described, - may be stamped and the spider 51 may be cast, 1 and, since these parts as well as the reinforcing plate 21 are concealed within the container, d they require no surface finishing or polishing.

8 Forming the ring 46 so that it is of channel - shape in cross section not only provides space between the vertical wall 14 of the container and the central vertical portion 51 of the ring 46 into which the engaging portion 62 of the legs 59 may project, but also strengthens the ring 46 against deformation and increases its resistance to the axially directed forces imposed when the cover is clamped to the container 12.

The termination of the collecting member 80 substantially below the top plate 69 of the purifier element 68 and the upper surface of the purifying material 92 prevents the passage of unpurifled oil into the collecting means 80 and insures that, even though the purifying material 92 may become compacted and separated a short distance from the upper plate 69, no oil can enter the collecting means 80 without first being purified by passage through some of the purifying material 92.

It will be seen that by providing the reinforcing plate 21 in the bottom of the container 12, my invention makes possible a purifier unit including a thin walled container, while providing means for securely attaching thereto, and in liquid-tight relationship therewith, inlet and outlet bosses, facilitating the installation of the purifier in the oil circulating system of an engine, and a purifier unit in which the purifier element is supported in fixed relation to the thin walled container without undue stresses upon such container.

The inlet and outlet bosses 26 and 33 are made of the same dimensions so that they are interchangeable. However, only one of them is provided with the small opening or orifice 44.

If it is desired to subject the container 12 to the full pressure of the oil circulating system, the boss with- the orifice 44 is employed as an outlet boss, where it restricts the flow of oil through the container 12 so that only the desired proportion of the oil flowing through the oil circulating system is passed through the~purifier. However, if it is desired to subject the conStainer 12 to a pressure less than the pressure in the oil circulating system, the boss with the orifice 44 therein is employed as an inlet boss.

While that embodiment of my invention hereinbefore illustrated and described is fully capable of performing the objects and providing the advantages primarily stated, and, while the usefulness of my invention has been illustrated by its application to a purifier for use in oil circulating systems of internal combustion engines, my invention is not limited to the embodiment hereinbefore illustrated and described or to such use.

I claim as my invention: 1. In a liquid purifier, the combination of: a cylindrical casing open at one end and having at the other end an end wall provided with relatively small inlet and outlet apertures, one of which is centrally located in said .end wall; a duct means seated in said central aperture; a purifying cartridge assembly having a central conduit and adapted to be readily removably secured to said duct means with said conduit in communication with said central aperture, said cartridge assembly being dimensioned to provide a relatively small clearance space between it and the end and side wall of said casing; stops on the inner surface of said casing formed by indentation of said casing and facing said open end and disposed to limit movement of said cartridge assembly toward said end wall; inwardly facing guides on the inner surface of said casing formed by indentation of said casing and converging inwardly and toward said end wall adapted to guide said cartridge assembly into axial alignment with said casing as said assembly moves toward said closed end and into contact with said stops; and a readily removable cover secured to the open end of said casing.

2. In a liquid purifier, the combination of: a cylindrical casing open at one end and having at the other end an end wall provided with relatively small inlet and outlet apertures, one of which is centrally located in said end wall; a duct means seated in said central aperture; a purifying cartridge assembly having a central conduit and adapted to be threadedly secured to said duct means with said conduit in communication with said central aperture, said cartridge being dimensioned to provide a relatively small clearance space between it and the end and side wall of said casing; inwardly facing guides on the inner surface of said casing formed by indentation of said casing and converging inwardly and toward said end wall adapted to guide said cartridge assembly into axial alignment with said casing as said assembly moves toward said closed end into position to be threadedly secured to said duct means; and a readily removable cover secured to the open end of said casing.

3. In a liquid purifier, the combination of: a cylindrical casing open at one end and having at the other end an end wall provided with relatively small inlet and outlet apertures, one of which is centrally located in said end wall; a duct means seated in said central aperture; a purifying cartridge assembly having a central conduit and adapted to be threadedly secured to said duct means with -said conduit in communication with said central aperture, said cartridge assembly being dimensioned to provide a relatively small clearance space between it and the end and side wall of said casing; stops on the inner surface of said casing formed by in45 dentation of said casing and facing said open end and disposed to limit the threaded movement of said cartridge assembly toward said end wall; and a readily removable cover secured to the open end of said casing.

4. In a purifying device, the combination of: a housing; inlet and outlet fittings adapted for projection through said housing, each of said fittings including a boss'with a liquid passage therethrough, one of said liquid passages being restricted in cross section, and said bosses being Sinterchangeable, and one of said fittings including a connecting sleeve having a liquid passage therethrough and adapted for threading upon one of said bosses, whereby said housing is clamped between said sleeve and said boss; an inner 0shell having imperforate end and perforate side walls; a pervious conduit centrally disposed in said shell and extending from one of said end walls to adjacent the other of said end walls, said conduit comprising a layer of fabric and a perforate sheet rolled into a cylinder; an inlet sleeve connecting one of said end walls and said conduit and having a liquid passage therein adapted for communication with said liquid pasSsage in said connecting sleeve, said inlet sleeve being adapted for threaded engagement with said connecting sleeve, whereby said inner shell is supported in said housing; and a fibrous material between said conduit and said side walls Sand between the end of said conduit and that one of said end walls adjacent thereto.

5. In a liquid .purifier, the combination of: a cylindrical casing open at one end and having at the other end an end wall provided with relatively small inlet and outlet apertures, one of which is centrally located in said end wall; a duct means seated in said central aperture; a purifying cartridge assembly having a central conduit and adapted to be readily removably secured to said duct means with said conduit in communication with said central aperture, said i" cartridge assembly being dimensioned to provide a relatively small clearance space between it and the end and side wall of said casing; a plurality of stops on the inner surface of said casing formed by the indentation of said casing and 1 facing said open end and adapted for limiting the movement of said cartridge assembly towards said end wall; a plurality of inwardly facing guides on the inner surface of said casing formed by indentation of said casing and converging in- (2 wardly and towards said end wall, said guides being disposed between and extending above said stops and being adapted to guide said cartridge assembly into axial alignment with said casing as said assembly moves towards said closed end 2 and into contact with said stops; and a readily removable cover secured to the open end of said casing.

6. In a purifier device, the combination of: a housing; inlet and outlet fittings secured to said :3 housing and communicating with the interior thereof; an inner shell having imperforate end and perforate side walls; means having a passage therein on one of said end walls adapted for releasable connection to one of said fittings, whereby said inner shell is supported in said housing; a pervious conduit centrally disposed in and terminating within said shell and connected to said means, said conduit comprising a layer of fabric and a perforate sheet rolled into a cylinder, said layer of fabric being folded over said perforate sheet at one end of said cylinder; a clamping member secured on one end of said cylinder and clamping said folded portion of said fabric layer against said cylinder, said member having an imperforate end portion closing the end of said cylinder; a cup secured to one of said end walls and extending inwardly of the adjacent end of said conduit; and a fibrous material between said conduit and said side walls and between the end of said conduit and that one of said end walls adjacent thereto.

7. In a purifier device, the combination of: a housing; inlet and outlet fittings secured to the said housing and communicating with the interior thereof; an inner cartridge having imperforate end and perforate side walls, said side walls comprising inner and outer perforated relatively rigid retaining sheets and an intervening fibrous fabric layer confined between the said sheets; means having a passage therein mounted in one of said end walls and adapted for releasable connection with one of said fittings; a liquid conduit connected with said passage means and comprising perforated relatively rigid inner and outer retaining walls and an intervening fibrous fabric layer held between 'said inner and outer walls, said conduit being disposed within said cartridge; and intervening purifying material within said cartridge and enclosing said conduit.

8. A combination according to claim 7 wherein cups are carried within said cartridge between said imperforate end walls and adjacent the opposite ends of said conduit, said cups extending alongside the end portions of said conduit to prevent direct passage of fluid along said end i walls to said conduit ends.

9. A combination according to claim 7 wherein said conduit comprises a fabric sheet rolled within a perforated sheet into cylindrical form, said perforated sheet providing the inner and outer Swalls of said conduit and confining said fabric sheet between its convolutions.

10. In a purifier device, the combination of: a cartridge adapted to be disposed in a housing and having imperforate end walls and perforate side i walls, said side walls comprising inner and outer perforate, relatively rigid retaining sheets, and an intervening fibrous fabric layer confined between said sheets, one of said end walls being provided with a passage; a liquid conduit con0 nected with the end wall provided with said passage, and communicating with said passage, said conduit comprising perforate, relatively rigid inner and outer retaining walls and an intervening fibrous fabric layer held between said inner and *, outer walls, said conduit being disposed within said cartridge; and intervening purifying material disposed within said cartridge and enclosing said conduit.

11. A combination as in claim 10 wherein means is disposed within said cartridge at said passage for mounting said one of said end walls on a support, said means providing a passage communicating with said liquid conduit.

12. A combination as in claim 10, including passage means mounted in said passage in said one of said end walls, said passage means being adapted for releasable connection with a fitting having a passage and carried by said housing.

13. A combination as in claim 10 wherein said conduit comprises a fabric sheet rolled within a perforate sheet into cylindrical form, said .perforate sheet providing the inner and outer walls of said conduit and confining said fabric between its convolutions.

14. A combination as in claim 10 wherein cups are carried within said cartridge between said imperforate end walls and adjacent the opposite ends of said conduit, said cups extending alongside the end portions of said conduit to prevent direct passage of fluid along said end walls to said conduit ends.

JOHN K. RUSSELL.