Патент USA US2407046код для вставки
Patented Sept. 3, 1.946 2,407,045 UNITED STATES PATENT OFFICE 2,407,046 EEADILY CLEANABLE FILTER Cecil Gordon Vokes, London, England Application March 15, 1944, Serial No. 526,571 in Great Britain January 27, 1943 6 Claims. (Cl. 210—167) 9 ad the header. The nut l2 thus clamps the end caps 5 and It) to the ends of cylinder 2. A bottom plug it has iournaled coaxially within it a spin dle l9 having an axial bore in which the rod I3 bears loosely. The spindle I9 has an upwardly projecting fork 2!] and an external downwardly ‘ 1 This invention provides a filter incorporating means for mechanical cleaning of the ?lter screen. Many materials used for ?ltering get ob structed by a shallow deposit on the “dirty” side long before the general body of material has be come choked and provision is sometimes made for removing from a ?lter casing a unit including projecting operating handle 2 I. the screen so that the deposit can be removed Surrounding the felt discs is a rotatable cage 22 with‘ a lower relatively narrow cross-member or bar 23 loosely "engaged by the fork 20 (see Fig. 2). In the form shown the cage comprises a cylinder 22 and the unit replaced. It has also been proposed to use scraping means bearing resiliently against the dirty surface of a filter screen of circular section and relatively movable by rotation about freely centered about the unit, so that the scrapers (formed as shown by pieces 24 struck in wardly to form inclined slots 25 and disposed ing and to provide for the sludge or deposit to be drawn oil‘. ‘The improved ?lter is of this latter cl about the outside of its circumference) auto kind and has a cage or like mountln’Y which car» matically tend to equalize their contact on the ries scraping means disposed about the circum dirty (outer) side of the felt discs l. The inter- ' ierence of the screen and is freely centered rela nal surfaces of the scrapers are made to lit with tively to the screen so tending automatically to resilient pressure against the cylindrical outer give a uniform scraping contact about the screen ill) surface of the assembled discs. The slight resil as rotation takes place. ience of thediscs may suf?ce or the scrapers may Other parts of the invention are embodied in a themselves be somewhat resilient or resiliently typical form which will now be described with mounted in the cylinder or cage 22 and it will be reference to the accompanying drawing. ‘This apparent that the contact of scraping means dis form is primarily intended as an oil ?lter to be posed about the screen automatically tends to uniformity. inserted in a by-pass leading straight back to the oil reservoir or sump and not supplying the bear In operation the voil, passing through the slots lugs. to give rather ?ne filtration of a relatively 25 results in the dirt building up as a ?lm on the the axis of the screen, from outside the ?lter cas small proportion of the circulating lubricating oil surface of the material. of internal combustion engine. The parts of the invention for which a patent is desired are those delimited by the claims. In the drawing: Fig. 1 is a central sectional elevation, and ating handle clockwise looking up along the rod is the dirt and sludge are loosened and scraped or sliced off and worked downwardly by the in clined scraper edges, so that they ?nally fall to the bottom of the casing where by removing the plug (or opening a tap) they can be withdrawn. Clearly various other arrangements can be de vised for rotating means resiliently bearing on a relatively small area and cleaning or scraping the Fig. 2 is a detail to a larger scale. The unit or element is built up of discs l of felt or other suitable material ?rmly mounted on a central perforated cylinder 2.> End plates 5 and it are retained by securing centrally to plate 5 a tube section ii, substantially midway be external or internal surface of a cylindrical unit, 4-0 with suitable sumps and plugs or taps for with drawing the sludge. tween the ends of said sleeve, as shown. A de pression in plate 5 concentric with the tube sec tion 4, receives against the end head casting 8. 4 is attached to On rotating the oper I claim: 1. A ?lter comprising a casing, a hollow cy lindrical ?lter element in said casing, a cage formed of resilient material in said casing, sur a packing ring 6 which bears of the outlet passage '3 of the The lower end portion 3 of tube a spider 5 to which the second rounding said element in spaced relation thereto, and having scraper blades struck inwardly from end cap Ii} is secured by a bolt ! i extending cen trally through cap it and a nut E2. The bolt is extended as an axial rod i3 of reduced diameter. its surface to form scraper edges resiliently en gaging the outer surface of said element, each The upper portion of tube ll- has two diametrically opposite bayonet slots at M to engage a cross edge forming a section of a helix about the com mon axis of said element and cage, and means bar l5 ?tting holes in the walls '! of the ‘outlet passage of the ?lter casing header 8. The inlet passage 15 leads into the space surrounding the tive rotation of said cage and‘ element. 2. in a ?lter, a casing, a hollow cylindrical unitwithin the cylindrical casing ll secured to operable externally of said casing to effect rela 1i CA ?ltering element ?xedly mounted in said casing, 2,407,046 3 4 a cage formed of resilient-material in said casing including a top plate, a cage formed of resilient material in said casing surrounding and substan tially axially coextensive with said element in spaced relation thereto, the upper end of said cage being ?anged inwardly to rest loosely on surrounding said element in spaced relation thereto and substantially axially coextensive therewith, said cage having scraper blades sym metrically mounted about said cage and extend ing inwardly therefrom, each said blade having an edge extending helically of and resiliently en tending resilient scraper blades forming scraper gaging said element, means mounting said cage for axial rotation about said element and for edges in the contact with the outer surface of said element, each edge forming a section of a said top plate, said cage having inwardly-ex limited translation transversely to said element, 10 helix about the axis of said element, a spindle journalled in the lower wall of said casing co whereby the resiliency of said blades maintains axially with said element and having a forked said cage substantially coaxial with said element, upper end and a handle at its lower end exterior ly of said casing, and a member secured diamet 3. In a ?lter, a casing, a hollow cylindrical ?l 15 rically of said cage at its lower end and rest ing loosely in said fork, said cage being main ter element ?xed in said casing, a cylindrical cage tained coaxial of said element by the resiliency formed of resilient material and mounted in said of said blades. casing for rotation externally about and coaxi 6. In a ?lter, a closed casing having a central ally with said element in radially spaced relation thereto, said cage having an axial dimension not 20 axis, the upper end of said casing being closed by a header having a cylindrical wall coaxial of said less than that of said element and having a plu rality of integral blades extending inwardly from axis to form a chamber, an outlet port in said its surface to form scraper edges each resiliently header in communication with said chamber, a hollow cylindrical ?ltering element in said cas engaging the outer surface of said element, each said edge being substantially in the form of a 25 ing coaxial with said axis and including an upper plate across one end of said element, a tube‘sec portion of a helix extending coaxially of said tion extending through and ?xed to said ?rst cage said edges overlapping axially of said cage, plate coaxially with said element, said tube hav whereby, on rotation of said cage, said edges act ing an upper portion having bayonet slot therein to clean the entire external ?ltering surface of said element, and means engaging said cage and 30 and adapted to slidably ?t said chamber and to engage lugs therein to hold said upper plate in operable exteriorly of said casing, to rotate said ?uid-tight engagement with the lower edge of cage relatively to said element. said chamber, a second plate extending over and 4. In a ?lter, a casing, a hollow ?lter compris closing the lower end of said element, means con ing a foraminous cylinder, a sleeve-like ?lter ele ment surrounding and ?tting said cylinder to 35 necting said lower plate and tube section to clamp said element between said plates, a rod project form a cylindrical outer surface, upper and lower ing downwardly from said lower plate along said plates, means securing said plates together to axis, a spindle journaled in the lower end of said engage the ends of said cylinder and clamp said casing for rotation on the axis of said element element therebetween, said means comprising a tube section secured centrally and intermediate 40 and having an axial bore loosely receiving said rod and also having a forked end within said cas its ends to said upper plate, a spider secured to ing, a cage coaxial of and surrounding said ele the lower end of said section, bolt and nut means ment, said cage having inwardly extending heli extending axially of said cylinder and element cally-arranged blades providing‘ scraper edges and connecting said spider and lower plate, and a releasable connection between the upper end of 4 resiliently engaging said element, said cage hav ing an upper ?ange resting loosely on said upper said tube section and said casing a cage formed plate and a bar extending diametrically across of resilient material, surrounding said ?lter in its lower end, said bar being loosely journaled on radially spaced relation thereto, and having said rod and engaging said fork, said spindle being blades struck inwardly therefrom, each blade forming an edge resiliently engaging said ele 50 rotatable exteriorly of said casing to thereby ro tate said cage, the resiliency of said blades act ment, said cage including an inward flange ing to maintain said cage substantially coaxial resting on said upper plate to thereby support with said element and all said scraper edges in said cage and means engaging said cage and op erable exteriorly of said casing to rotate said contact therewith, and an inlet port in said header in communiaction with said casing ex cage relatively to said element. teriorly of said element. 5. A ?lter comprising a casing, a hollow cylin CECIL GORDON VOKES. drical ?lter element secured in said casing, and and means operable from the exterior of said cas ing for rotating said cage.