US 3118837 A
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Description (OCR text may contain errors)
S. W. BRIGGS Jan. 2l, 1964 FILTER Filed June 25. 1960 oooeoooa aooooooooov ooooaoooooooaoaodo g D o o o a n n o a o o D C n /uoaonanooeodcaone NVENTOR lilallilillll SOUTHWICK v'v. BRIGGS FIG.6
ATTORNEY United States Patent O 3,118,837 FILTER Southwick W. Briggs, Howard County, Md. (6420 Western Ave., Chevy Chase, Md.) Filed June 23, 1960, Ser. No. 38,277 4 Claims. (Cl. 210-232) This invention relates to a filter and particularly to the maintenance of a filter in sealing engagement with a fluid line.
It is quite frequent that filters are installed in positions slightly displaced from those intended so that the fluid under treatment will bypass the filter medium and possibly result in damage to the equipment for which the filtered fluid is intended.
It is among the objects of the present invention to provide a filter having a substantial degree of compliance to the mountings for which it is intended soy that even though it is not precisely positioned during installation, any departure from the correct position will be compensated automatically so as to avoid the inherent dangers which might result from leakage.
A filter according to the present invention comprises a central perforated tube, a filter medium surrounding the tube, a perforated cover member surrounding the mediiun, a closure covering corresponding ends of the tube, medium and cover member, a cap covering opposite corresponding ends of the medium and cover member and containing an opening in registry 'with the tube, and a sealing surface carried by the cap for engagement with a fluid conductor. The closure preferably carries a bearing element of flexible and resilient material which may assume the form of an -annular elastomeric body. The sealing surface preferably includes an annular elastomeric body. The closure preferably contains a recess in which a yieldable resilient member is disposed providing some yieldability both axially and radially. Since both the cap and closure preferably carry resilient abutment members, it will be understood that the filter as an entirety will be somewhat compliant when it is installed for use. A tubular projection is preferably carried by the cap to provide the sealing surface and the projection preferably terminates in a flange which may be axial or radial.
A more complete understanding of the invention will follow from a description of the accompanying drawings wherein:
FIG. 1 is a plan view depicting a tank in which four filters conforming to the present invention have been depicted as secured for operation;
FIG. 2 is an elevation depicting the assembly of FIG. l as it would appear when a section is taken along line 2-2 of FIG. l;
FIG. 3 is a fragmentary elevation on a somewhat enlarged scale of one of the filters;
FIG. 4 is a fragmentary sectional elevation on a further enlarged scale depicting one form of seal;
FIG. 5 is a fragmentary sectional elevation depicting a modified form of seal; and
FIG. 6 is a sectional elevation of a modified form of j seal applied to a cap.
A tank 10 provided with a lfluid inlet fitting 12 is adapted to receive :a group of filters 14, made up, in the example illustrated, of four filters. Projecting upwardly from the bottom wall 16 of the tank there is a plug l18 for communication with each of the filters, the plug being tubular to serve as an outlet port for its respective filter. Also projecting upwardly from the bottom wall 16 of the tank there is a rod 20 adapted to receive a yoke 22, and at its upper threaded end 24, a winged nut 26 for securing the filters in their proper positions Within the tank. As will be noted from FIG. l, in order to assist -in the Lce positioning of the filters, an annular marking 28 is applied to each filter.
One of the filters has been depicted on an enlarged scale in FIG. 3 from which it will become evident that the filter is of the pleated impregnated paper type having a central tube 30 containing perforations 32 surrounded by a pleated paper filter medium 34 which is in turn surrounded by an impregnated paper cover member 36 having an imperforate section 38 opposite the inlet fitting 12 and containing perforations 4t) throughout its other areas. A metal closure 42 covers the upper ends of the tube 30, the filter medium 34 and the cover 36 and contains `a central welll or recess 44 in rwhich is received an annular elastomeric abutment member 46 containing a central concavity to complement a convex portion carried by each arm of the yoke 22. This elastomeric annulus may be composed of any of a number of materials, but where hot oil is to be filtered, neoprene or -a combination of cork and neoprene are well suited as the material since these swell somewhat in the presence of hot oil and tend to maintain a tight joint between the filter and its mountings.
The lower ends of the filter medium 34 and the cover member 36 are covered by a cap l48 containing a central opening 50 in registry with the central tube 30. Secured to the cap 48, there is shown in FIG. 3, a tubular projection 52 having a radial flange 54 at Iits upper end spot welded to the radial surface of the cap, an axial cylindrical wall 56 extending downwardly and termin-ating in a radial flange 58 directed outwardly. The lower radial flange 58 and a portion of the axial wall are embedded in a body -of elastomeric material 60 as depicted in FIG. 4 for engagement with a divergent sealing surface 62 formed on the plug 18. It will follo-w that when these filters are clamped yby means of the yoke 22 and the winged nut 26, the sealing material 60 will become deformed and seat against the plug 1'8- so as to prevent leaktage between them. Even though the filter may not be positioned in precise alignment with the plug, it 'will follow that the yieldable and resilient nature of the elastomeric materials 46 and 60 Will yield and compensate for any reasonable amount of misalignment.
In the modification depicted in FIG. 5, instead of embedding the lower flange 58 with the elastomeric sealing material, similar elastomeric sealingmaterial 64 in the -form of an annulus is introduced against the lower surface of the upper radial flange 54 and held in that position by a dished retaining annulus having a flange 66 directed inwardly to abut the lower surface of the elastomeric annulus and an annular wall 68 frictionally engaging the inner wall of the tubular projection 52. In this case, the seal is produced between the elastomeric body 64 and the frusto-conical portion of the plug 18.
In the modification depicted lin FIG. 6, the tubular projection S2 has -an upper flange 54 secured to the radial surface of the cap 48, an axial wall 56 and an inwardly and upwardly directed end 70 providing a sealing surface 72 for engagement with the plug 18, not shown in this figure. By virtue of its configunation, the metal seal- -ing surface 72 will be sufficiently deformable to produce an acceptable seal when it is clamped -by means of the yoke 22 and the winged nut 26 already described. An elastomeric body 64 can also be interposed between the reversely directed end 70 and the cap 48 to provide an additional sealing surface for engaging the plug.
By virtue of the constructions described, the filter itself can be composed largely of impregnated paper employing only metal for lits closure, cap and tubular projection, rendering it possible to produce satisfactory filters at lower cost than heretofore available.
Whereas only a limited number of modifications have been described 1with reference to the accompanying drawings, such vairations as will be suggested to those skilled in the art are contemplated as 4falling within the scope of the appended claims.
1. A Ylter comprising a central perforated tube, a filter `medium surrounding said tube, a perforated cover member surrounding said medium, a closure covering corresponding ends 4of said tube, medium and cover member, a portion of said closure extending into said tube to define a substantially ,cylindrical depression, a metal cap covering opposite corresponding ends of said medium and cover member and containing an opening in registry with said tube, a tubular metal member secured to said cap in registry with said opening and extending axially beyond said cap to define a uid port, an annular sealing member of flexible resilient elastomeric material carried by said tubular member and extending radially inwardly thereof and axially beyond said tube for sealing engagement with a fluid conductor, and a flexible resilient elastomeric abutment member having end and side walls engaging said depression and an exposed end wall containing a depression for engagement with securing means.
2. A iilter according to claim 1 wherein said abuti ment member contains a concave seat for engagement with securing means.
3. A lter according to claim 1 wherein said abutment member has a composition including neoprene.
4. A lilter according to claim 1 wherein said tubular metal member has opposite ends terminating in oppositeiy directed radial anges, and one of said anges is welded to said cap.
References Cited in the file of this patent UNITED STATES PATENTS 2,576,144 Rood Nov. 27, 1951 2,660,3114 Lasky Nov. 24, 1953 2,822,201 Wood Feb. 4, 1958 2,835,393 `Buckrnan May 20, 1958 2,902,163 Humbert Sept. 1, 1959 2,904,184 Daley et al Sept. 15, 1959 2,979,208 Humbert Apr. 1l, 196i FORElGN PATENTS 317,442 Switzerland Jan. l5, 195,7 1,130,459 France Feb. 6, 1957