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Publication numberUS2732031 A
Publication typeGrant
Publication dateJan 24, 1956
Filing dateMay 7, 1953
Priority dateMay 7, 1953
Also published asDE1018844B
Publication numberUS 2732031 A, US 2732031A, US-A-2732031, US2732031 A, US2732031A
InventorsMilton Rabbitt
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Combination seal and gasket for end of pleated cartridge
US 2732031 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

Jan. 24, 1956 M. RABBITT ET AL 2,732,031


ATTOR N EYS CARL F. BINDER United States Patent "ice COMBINATION SEAL AND GASKET FOR END or PLEATED CARTRIDGE Milton Rabbitt, Gregory, and Carl F. Binder, Ann Arbor, Mich., assignors to Fram Corporation, a corporation of Rhode Island Application May 7, 1953, Serial No. 353,469

1 Claim. (Cl. 183-69) This invention relates to a cartridge for a filter for any fluid, particularly for filtering air, although it is not exclusively for this purpose.

Using a paper, or other porous or permeable membrane material, disposed in generally the shape of an annulus with the paper in zigzag pleats extending generally radially of the annulus presents a problem for sealing the ends of the pleated paper which may be effected quickly and inexpensively and yet provide a complete and satisfactory seal. Such filters, or filter cartridges, are also usually mounted between metal parts and require separate gaskets so that they may be sealed with relation to these more rigid parts to control the passage of air in the desired direction.

One of the objects of this invention is to provide an inexpensive seal for a pleated annulus which may be quickly and easily applied.

Another object of the invention is to provide a seal which at the same time may act as a gasket to seal the pleated annulus in its more rigid casing or mounting.

Another object of the convention is to provide a ma- ,terial which will have a rubber-like consistency and be flexible and resilient so that it may not only seal the pleated cartridge in the framework in which it is mounted, but may also seal the pleats at the upper and lower ends of these pleats and serve to maintain the pleated annulus in substantially the desired annular shape which it is to assume.

Another object of the invention is the use of a sealing material that may be slush-molded or dip-coated in a cold state, and then heat-treated.

With these and other objects in view, the invention consists of certain novel features of construction as will be more fully described and particularly pointed out in the appended claim.

In the accompanying drawings:

Fig. 1 is an elevation partly in section showing an air cleaner for a carburetor equipped with a pleated cartridge which is the subject of this invention.

Fig. 2 is a fragmental section on line 2-2 of Fig. 1 of the cartridge alone.

Fig. 3 is a section on substantially line 3--3 of Fig; 2.

Fig. 4 is a fragmental section showing the upper portion of the cartridge as seen in Fig. 1 but on an enlarged scale.

Fig. 5 is a perspective view showing the cartridge as separated from the rigid casing in which it is mounted.

In proceeding with this invention we provide concentric screens through which air may freely pass, and position between these screens, paper in zigzag or pleated form with the sections between fold lines disposed generally radially of the annulus in which it is disposed. This paper is sealed at its ends by a rubber-like material which is so formed that it holds the pleats in place and provides a gasket for mounting the pleated annulus within the metallic framework of the structure for supporting it.

With reference to the drawings, designates an intake air conduit supported by the shell 11 which is a part of a resonating device mounted upon the casing 12. A

2,732 ,03 l Patented Jan. 24,1956

spider 14 is mounted on the shell 11 bridging the conduit 10 and supports a cover 15 which is bent inwardly as at 16 and provided with an opening 17 to receive therethrough a threaded stud 18 which is carried by the spider. A wing nut 19 secures the cover in position. Between the cover and the shoulder 20 of the casing 12 at the lower edge of the shell 11, I mount a cartridge 21 constructed as best shown in perspective in Fig. 5.

This cartridge comprises an inner cylindrical screen 22 and an outer cylindrical screen 23 which are spaced and are concentric. Disposed between these screens a web of paper is provided in zigzag pleated relation formed with folds 25 at its inner edge and folds 26 at its outer edge. The extent of each of the portions 27 between the fold lines is substantially the distance that the concentric screens are spaced. Thus, the fold lines 25 may contact the inner screen wall 22 should pressure he so exerted as to cause the pleated form to'tend to move inwardly or the fold lines 26 might engage the inner surface of the screen 23 were there such back pressure as to cause the pleated annulus to tend to move outwardly.

This assembly is sealed by molding or dip-coating its opposite ends in a rubber-like material 30 which imbeds the edges 31 of the pleated paper therein and also imbeds edges 36 and 37 of the screens, although in some cases the screens may be separate from the material 30 and not imbedded. As this material is applied to the ends of the paper annulus, there may be formed a rib 33 on the upper surface at one end and a rib 35 on the lower surface at the other end. The lower rib 35 will contact the shoulder 20 at the lower end of the cartridge and the upper rib 33 will contact the under surface of the portion 34 of the cover at the upper end, thus providing a good seal between the cover and the shell at these locations while permitting air to pass through the pleated material along the outer surface of the shell 11 and into the duct 10 to the carburetor.

The material which we prefer to use for sealing the ends of pleated paper comprises an intimate mixture or dispersion of a vinyl resin in a liquid plasticizer which will be a non-volatile liquid plasticizer. The vinyl resin may be of a vinyl chloride or poly-vinyl chloride and is present usually in a dispersed phase in the non-volatile liquid plasticizer and which will remain in this state at room temperatures and will be of a viscous or thick nature so that it may be spread, dipped, or slush-molded into the form desired. Due to the fact that the plasticizers are non-volatile, there is no shrinkage as drying occurs.

After the material is molded into substantially the form desired or acquires that form by some other method, in order to set the material it is heated to a temperature of from 300 to 350 F. in such a way that the entire mass is subjected to this heat range which causes the resin dispersions to fuse into the plasticizer and become substantially one homogeneous mas of material. The conversion makes a very tough, flexible, elastomeric vinyl resin product without shrinkage which serves to maintain the pleated paper annulus in substantially the form it is given; also to provide a seal for this annulus at its ends. Further, by reason of the shape given to this sealing medium, a gasket is provided which will serve to seal the annulus when put in place between two rigid surfaces, such as a lower shoulder and a cover plate, and serve throughout the life of the cartridge upon which it is formed. If desired, the paper forming the filter membrane may be impregnated with a heat curing material, such as one of the phenolic resins commonly used for stiffening paper, of a type suitable for curing, or final curing, at the same time that the end-sealing material is cured. This combined curing would not only obviate any separate cures of the paper and end-sealing members but Will facilitate forming the filter membrane into a pleated annulus with its impregnating resin in an unset, plastic or semi-plastic state and then stiffening the whole assembly by curing the various components susceptible to such treatment, all at thesame time.

We claim: I p, v

A filter element comprising an annulus formed of a pleated porous fibrous sheet having the pleatsextending longitudinally of the annulus, and a combined closure and gasket for an end of the pleated annulus and which is formed throughout of a resilient rubber-like impernze able plastic consisting of a vinyl resin compound molded to shape with the ends of the pleats embedded therein and having an integral molded gasket of the same material protruding from an outer face of the closure.


References Cited in the file of this patent UNITED STATES PATENTS Poelman et a1 June 28, 1938 Kovacs Sept. 25, 1951 Wicks Feb. 3, 1953 Brock Mar. 24, 1953 Bell June 16, 1953 Robinson Oct. 6, 1953 FOREIGN PATENTS Great Britain Oct. 1, 1952 Great Britain Apr. 1, 1953 France Mar. 7, 1951

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2122111 *Nov 22, 1934Jun 28, 1938Poelman Armand J JAir filter
US2569243 *Dec 15, 1945Sep 25, 1951Purolator Products IncFilter
US2627350 *Jan 12, 1949Feb 3, 1953Wix Accessories CorpFilter cartridge
US2632526 *Apr 1, 1948Mar 24, 1953Martin Parry CorpMuffler and filter
US2642187 *Jan 11, 1950Jun 16, 1953Purolator Products IncFilter unit construction
US2654440 *Oct 18, 1951Oct 6, 1953Fram CorpFilter element formed of paper impregnated with thermoplastic resin
FR985029A * Title not available
GB680211A * Title not available
GB689619A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2771156 *Oct 22, 1953Nov 20, 1956Bendix Aviat CorpFilter
US2824622 *Oct 26, 1954Feb 25, 1958Gen Motors CorpGas filter
US2848065 *Feb 15, 1956Aug 19, 1958Purolator Products IncAir cleaner
US2871976 *Mar 30, 1956Feb 3, 1959Purolator Products IncAir cleaner-intake silencer unit and filter element therefor
US2895174 *Jan 10, 1957Jul 21, 1959Fram CorpManufacture of pleated filters
US2911101 *Aug 19, 1955Nov 3, 1959Richmond Engineering Co IncFilters
US2918138 *Feb 13, 1957Dec 22, 1959Gen Motors CorpDisposable and cleanable filter
US2919765 *Dec 6, 1956Jan 5, 1960Bendix Aviat CorpFilter element assembly
US2927495 *Feb 20, 1957Mar 8, 1960Victor H BarwoodComposite self-sealing washer
US2934165 *Jun 17, 1958Apr 26, 1960Purolator Products IncFilter
US2934791 *Feb 7, 1956May 3, 1960Bendix Aviat CorpMethod of forming filter endcaps
US2943699 *Feb 13, 1957Jul 5, 1960Gen Motors CorpAir cleaner and silencer assembly
US2947381 *Oct 14, 1958Aug 2, 1960Purolator Products IncAir cleaner assembly
US2956976 *Oct 7, 1957Oct 18, 1960Stubnitz Greene CorpPlastisol containing a vinyl chloride polymer and calcium oxide
US2962121 *Mar 26, 1958Nov 29, 1960Dollinger CorpFilter
US2963111 *Feb 18, 1957Dec 6, 1960Gen Motors CorpAir cleaner silencer assembly
US2965933 *Dec 30, 1957Dec 27, 1960Bendix CorpMethod of molding endcaps on filter elements
US2966960 *Dec 1, 1958Jan 3, 1961Foamade IndAir filter
US2968361 *May 11, 1959Jan 17, 1961Gen Motors CorpFilters for gases
US2988166 *Oct 30, 1958Jun 13, 1961Massey Ferguson IncAir cleaner
US2996145 *Sep 17, 1958Aug 15, 1961Gen Motors CorpFilter sealing means
US3013667 *Mar 14, 1958Dec 19, 1961Tecalemit LtdPlastic combining elements
US3025963 *Mar 13, 1958Mar 20, 1962Richard L JohnstonProducts useful as filtering devices and methods of making them
US3026609 *Oct 8, 1959Mar 27, 1962Carl N Beetle Plastics CorpFilter method
US3038211 *Sep 15, 1960Jun 12, 1962Fram CorpMethod of making filter cartridges
US3043739 *Dec 31, 1958Jul 10, 1962Grace W R & CoFilter element formed of pleated paper
US3053395 *Jul 14, 1959Sep 11, 1962Jaume RenePleated-wall tubular filter and method of manufacturing same
US3056503 *Feb 20, 1958Oct 2, 1962Vernon D RoosaFilter assembly
US3071915 *Sep 26, 1960Jan 8, 1963Farr CoFilter
US3076555 *Jun 29, 1959Feb 5, 1963Tecalemit LtdFluid filters
US3095290 *Oct 26, 1960Jun 25, 1963Fram CorpEnd sealing means for filter cartridges
US3124630 *Oct 25, 1957Mar 10, 1964 Method of producing coupling washer-equipped
US3133847 *Dec 2, 1960May 19, 1964Tecalemit LtdFluid filters
US3133852 *Sep 14, 1960May 19, 1964Alpha Res CorpVentilating spacer and method
US3137039 *Aug 25, 1958Jun 16, 1964GeneraMolds for making air
US3169844 *Jan 24, 1961Feb 16, 1965Wix CorpAir filter
US3235633 *Apr 2, 1962Feb 15, 1966Gen Motors CorpMethod of molding filter end caps
US3395208 *Jun 30, 1966Jul 30, 1968Coopers Mech JointsMethod for making filter and end cap assembly
US3399516 *Jun 2, 1965Sep 3, 1968Wix CorpImpregnated fiber air filter and method of making same
US3415384 *Aug 17, 1966Dec 10, 1968Bendix CorpElements for removing contaminants from liquid
US3423909 *Sep 28, 1967Jan 28, 1969Novo Ind CorpAir cleaner with improved filter element assembly
US3457339 *Dec 8, 1965Jul 22, 1969Pall CorpProcess for making end capped filter elements
US3640396 *Apr 3, 1970Feb 8, 1972Fram CorpFilter
US4078036 *Jul 24, 1975Mar 7, 1978Pittsfield Products, Inc.Cartridge filter construction
US4128251 *Sep 21, 1977Dec 5, 1978Champion Laboratories, Inc.Sealing gasket for air filter
US4303426 *Mar 14, 1980Dec 1, 1981Robert BattisAutomobile air filter having replaceable and readily disposable filter element
US4512892 *Feb 14, 1980Apr 23, 1985Millipore CorporationMethod and structure for sealing tubular filter elments
US5653831 *Oct 17, 1995Aug 5, 1997Sta-Rite Industries, Inc.Method and apparatus for making a filter module
US5783067 *Jan 25, 1996Jul 21, 1998Facet International, Inc.Elongated filter system, filter element therefor and methods of making same
US5985142 *Jul 9, 1998Nov 16, 1999Facet International, Inc.Method of making an elongated filter system
US6352665 *May 28, 1999Mar 5, 2002Firma Carl FreudenbergMethod for producing a tubular according filter element
US7455707Feb 10, 2003Nov 25, 2008Donaldson Company, Inc.Reverse flow air filter arrangement and method
US20040148913 *Feb 10, 2003Aug 5, 2004Donaldson Company, Inc.[reverse flow air filter arrangement and method]
DE1090423B *Apr 1, 1958Oct 6, 1960Fram CorpVorrichtung zum Verschliessen der Stirnenden eines ringfoermigen, aus einer poroesen Werkstoffbahn, wie Papier, gefalteten Filterelementes mittels aus Kunststoff herzustellender und mit dem Faltenring zu verbindender Endkappen
DE1188044B *Dec 8, 1961Mar 4, 1965Donaldson Co IncFilterelement
DE1202759B *Feb 8, 1961Oct 14, 1965Dollinger CorpFiltereinsatz
EP2279782A1Nov 17, 2005Feb 2, 2011Millipore CorporationFilter cartridge and method for manufacturing filter cartridge
WO1997026969A2 *Jan 23, 1997Jul 31, 1997Facet International IncElongated filter system
U.S. Classification55/499, 55/524, 55/502, 210/493.2, 264/DIG.480
International ClassificationB01D46/52, F02M35/024
Cooperative ClassificationB01D46/0049, F02M35/024, Y10S264/48, B01D46/521, B01D46/2411
European ClassificationF02M35/024, B01D46/24F4, B01D46/00G4C, B01D46/52F