US 2808937 A
Description (OCR text may contain errors)
Oct. 8, 1957 J. P. OMEARA 2,808,937
FILTER original Filed April les,y 1954 IN V EN TOR.
7 gwno' M BY l ZM @MLU United States arent O FILTER James P. OMeara, Milwaukee, Wis., assignor to W. M.
Sprinkman Corporation, Milwaukee, Wis., a corporation of Wisconsin Continuation of application Serial No. 423,651, April 16, application November 26, 1954, Serial No.
1 Claim. (Cl. 2111-445) The invention relates to filters and more particularly to those using replaceable filter media and especially those for filtering milk or other liquids under sanitary conditions.
Filters of the type above described must be capable of being readily cleaned and be formed so that the filter media may be easily and quickly replaced in the field, It has been found that the usual methods of clamping the filter media and a round ring gasket between the sections is not practical as capillary action of the fibres of the usual fibrous lter pad will cause leakage at the joint between the sect-ions. The object of the present in vention is to provide a new and improved form of housing and sealing gasket as hereinafter described which permits repeated renewals of the pad without danger of leakage occurring through the capillary action of the pad.
The invention further consists in the several features hereinafter set forth and more particularly defined by the cla-im at the conclusion hereof.
ln the drawings:
Fig. 1 is a vertical sectional view taken on the line 1-1 of Fig. 2;
Fig. 2 is a plan view of ,the filter, parts being broken away and parts being shown in section;
Fig. 3 is a side elevation view of the band clamp;
Fig 4 is an enlarged sectional View through the joint before clamping pressure is applied by the band;
Fig. 5 is a view similar to Fig. 4 showing the joint under clamping pressure;
Fig. 6 -is a detailed vertical sectional View taken on the line 6--6 of Fig. 3;
Fig. 7 is an enlarged vertical sectional view of the sealing ring.
Referring -to the drawings, the lter includes complementary housing sections 7 and 8, a sealing ring 9 of rubber .or other yieldable material or composition of material, a ilexible fibrous filter pad 10 of cotton, or other suitable flexible fibres or cloth made from such bres, and means for clamping the sections together with the ring 9 and peripheral portions of the pad V1t) be'- tween them.
After considerable experimenting, the peripheral edges of the housing sections have been formed to provide annular base flanges 11 which have cylindrically curved outer edge portions 12 and back portions 13 which slope or converge inwardly toward each other as shown so that the ring 9 and the outer peripheral edge portion 14 of the pad are clamped together entirely within the flanged area of the sections with the pad extending over one of the flanges. Also it has been necessary to develop a special ovate form of ring 9 which, as best shown in Fig. 7, has an inner cylindrical half portion 9a and an outer elliptical half portion 9b.
The parts may be clamped together by any suitable clamping means but are here shown as clamped together by a `one piece metal band 15 having a ilat central portion 16 and tapered sides 17 provided with laterally disposed reinforcing edge tlanges 18. The width of the 2,808,937 Patented Oct. 8, 1957 ilat portion is less than the width of the'edge to be joined so that the tapered sides of the band are capable of exerting a considerable compressive wedging action on the joint when the ends of the band 15 are drawn together. These 'tapered side portions are designed to engage the curved end portions of the band so that as the band is drawn up from the position shown in Fig.4 to the position shown in Fig. 5, the flanges 11 of the housing sectionsare moved toward each other, and the portions 12 of the flange 11 acting on the elliptical section portion 9b of the ring 9 act to flatten or distort it so that portions of thispart of the ring which are beyond the outer edge of the filter pad are forced out between the edges of the flanges to obturate the opening between said sections and kalso are forced into direct sealing contact with the curved edge of the housing section that projects beyond the pad, thus effectively sealing off the pad from the adjacent outer edges of the housing sections so that any capillary action that might occur in -the edge portion of the pad is prevented from producing a leak at the joint. The convergence of the flanges 11 back of their curved outer edges to the point where they join the sides of their sections acts to prevent the ring 9 from squeezing out between these flanges and causes the ring to be retained in the curved cavity formed by the curved edges 12 of the flanges in which the maximum clamping pressure is produced.
A Any suitable means may be used for drawing the ends of thebands 15 together, and inthe drawings I have shown a metal loop 2li welded or brazed to one end of the band and having a stirrup fitting 21 pivotally connected thereto at one end and provided with a slot 22 and a finger projection 23. A metal loop 24 welded or brazed to the other end of the band receives the pin ends 25 of a bolt socket 26. An F head bolt 27 is adapted to interlock with the slotted end of the stirrup fitting 21 and has its shank mounted to slide in the socket 26. The end of the bolt 27 is threaded for engagement with a threaded socket or nut 28 having pin projections 29 for turning it so as to draw up on the bolt 27 and thus bring the ends of the band 15 toward each other to produce the desired clamping tension of the Wedge sided band on the flanged edges of the housing sections, the ring 9, and the peripheral portion of the pad.
Each housing section has a centrally located opening 30 which at its outer end 31 is formed as a boss or threaded fitting to receive the nut of a union coupling connecting the filter in the filtering circuit. Either one of these fittings may be an inlet or outlet for the liquidV to be filtered. Instead of the plain openings Sil, these openings may be provided with inwardly extending tube portions as more particularly shown, described, and claimed in my copending application Serial No. 326,086, filed December 18, 1952, now Patent Number 2,727,634, for Filter, if desired.
This application is a continuation of my prior application Serial No. 423,651, filed April 16, 1954, now abandoned for Filter, as to common claimahle subject matter.
I desire it to be understood that this invention is not to be limited to any particular form or arrangement of parts except in so far as such limitations are included in the claim.
What I claim as my invention is:
In a filter of the type described, the combination of a flexible fibrous self-sustaining filter pad, a sealing ring of yieldable material having an inner half of cylindrical cross section and an outer half of elliptical and greater cross section, a pair of complementary housing sections having outwardly extending base flanges with curved outer edge portions to engage the `outer portions of said ring, said flanges adapted to receive and position said 3 rirglbelweelhem wi'vi'dlhe peripheral portions of the pad' disposed jb'etween `l:mide"fofsadrrhtrgrrd-a"part^c f the ange of one of said sections, and damping means for exerting a clampingpressure substantially .conned to 'he "curved outer 'edge poto'ns "of said anges to Squeeze' the ring to v a Lflattenedforrnoce1use'sai'drfng to" seal ithe space kbetween 'said 'anges `rrell'idngthespaee betweenthe end of the pad and'theend of "itsiassocated 'flange land-"to extrude a portion of 111e' elliptical halfof thefringrbetween theouterside edges'of sa'idanges to 10 preventlekage 'by 'capillaryn'ctonof the pad.
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