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Publication numberUS3526237 A
Publication typeGrant
Publication dateSep 1, 1970
Filing dateMay 8, 1968
Priority dateMay 8, 1968
Publication numberUS 3526237 A, US 3526237A, US-A-3526237, US3526237 A, US3526237A
InventorsScott E Neill Jr
Original AssigneeScott E Neill Jr
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Filter cleaner
US 3526237 A
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Description  (OCR text may contain errors)

United States Patent [72] lnventor ScottE.Neill,J1-.

Amarillo, Texas (1147 H. St., Salida, Colorado 81201), [21] Appl. No. 727,594 [22] Filed May 8,1968 [45] Patented Sept. 1, 1970 [54] FILTER CLEANER 3 Claims, 5 Drawing Figs.

[52] US. Cl 134/58, 134/10,134/33,134/99,134/109,134/143, 134/152 [51] Int. Cl B08b 3/02, B08b 11/00 [50] Field ofSearch 134/10, 33, 58,99, 102, 109, 140, 143, 152, 153; 210/167; 55/(No Search) [56] References Cited UNITED STATES PATENTS I 781,107 1/1905 Stewart 134/33UX 2,178,701 11/1939 Petre 134/33 2,615,456 10/1952 Galusha 134/140 2,699,793 1/1955 Bucketal. 134/143 2,756,455 7/1956 Slaughter.... 134/153x 2,919,704 1/1960 Butler 134/102. 3,088,391 5/1963 Sigler... 134/153x 3,089,167 5 1963 1311116161.... 134/22UX 3,174,490 3/1965 Flarsheim.... 134/152x 3,216,429 11/1965 Dick 134/102 3,442,273 5/1969 Hanishetal. 134/140x FOREIGN PATENTS 525,249 8/1940 GreatBritain 134 141 Primary Examiner-Morris O. Wolk Assistant Examiner-Joseph T. Zatarga Attorney-Ely Silverman ABSTRACT: A machine organized to successively apply a jet of cleansing liquid to the exterior surface of each successive portion of a complex shaped thin-walled dirty air-permeable air filter while the interior surface of that thin-walled portion is concurrently supported from collapse by the mechanical action of said jet, and is constructed to permit sufficient ready insertion of the filter into its treatment position and removal therefrom to permit public commerical coin operation thereof and is organized to provide for re-use of the treating liquid.

Patented Sept. 1, 1970 I 3,526,237

Sheet 1 ofs s SCOTT E. NEILL JR. I In Bl NVENTOR. v

BY M Y Patented Sept. 1, 19m 3,526,231

Sheet 2 of3 I25 IO /|42 9 I 7 33 g 2 47A SCOT-TE NE/LLJR.


ATTORNEY Sheet 3 of5 scoTT E. NE/LL JR.


ATTORNEY f i l FILTER CLEANER BACKGROUND OF THE INVENTION l.-Field of the Invention The application of liquid cleansing material to an implement having cavities and a work handling apparatus for such application.

2. Description of the Prior Art While air filters are necessary to protect the mechanical parts 'of the internal combustion engines they are required to be sufficiently freely permeable to air and permit about one cubic foot of air per second to pass therethrough to an automobile carburetor. As such filters become clogged with debris they reduce the efficiency of the internal combustion engines (whether rotary or reciprocating piston) and the combustion efficiency of the average automotive engine is impaired, especially at high speed or acceleration, to the extent of a loss of efficiency of about three miles per gallon in a car usually performing at about 18 miles per gallon.

Cleansing of automotive air filters has been usually attempted by hand held rapping and/or forceful but brief air blast with hand manipulation of the air filter during such manipulation: such air blasts are frequently so violent as to rupture the filter element; such use of air blast and mechanical rapping are not reliable and neither serves to dislodge any but the most loosely held material. Replacement of clogged filters is the usual remedy. Other machines available for strainer cleaning dependent upon flow of the cleansing solution through the filter element (e.g. US. Pat. No. 2,170,081) increase the pore size of the element and, with an oleophyllic surface, as is developed in most air filters, the use of water is ineffective and oil cleansing requires impractical pressures.

SUMMARY OF THE INVENTION This invention provides a solution to the problem of cleaning the outer surface of a filter wall, where most of the dirt and debris is located, by applying to the outer surface of a thin dirty. airfilter wall a liquid jet of sufficient force to dislodge and remove increments of dirt and debris from the outer surface of that wall without causing any damage to that wall by providing mechanical support to the complexly shaped inner surface of that thin wall, while the outer surface thereof is thus forcefully scrubbed, the jet striking the surface at an angle.

The liquor used is provided sufficient detergent action to loosen the increments of dirt fromthe filter wall when used as a jet but not enough chemical activity to keep the dirt stably suspended. This results in that the liquor used to dislodge the debris and dirt from the filtersurface may be separated by the apparatus-of this invention from such debris and dirt and be re-used; this provides that no separate continuous water addition facility and continuous dirty water drain is required. The apparatus is also constructed to permit ready location, by the average member of the public, of a filter of any of a large variety of sizes and shapes in the apparatus and ready removal of the treated filter.

Further still, this apparatus and process uses the operation ofthe internal combustion engine in which the air filter is used to assist in completely drying the treated filter: the structure of the apparatus and steps of the process are adapted to the do ityourself" public that presently uses coin op erated machinery such as coin-operated automatic car washes, automatic clothes washers and dryers and the like.

One object of this invention is to provide an improved apparatus for cleaning automobile air filters.

Another object of this invention is to provide an improved process for cleaning automobile air filters.

' Other objects will become-apparent to those skilled in the art'on' study of the below description of apparatus and the hereto appended drawings, which drawings for a part of the description of apparatus and in which drawings the same referent numeral refers to the same part throughout.

DESCRIPTION OF THE DRAWINGS FIG. 1 is a partly broken away front view of one embodiment of apparatus, 10, of this invention with work chamber door 36 and clarification chamber door 38 open.

- it is broken away along section lA-lBlClD of FIG. 4.

FIG. 2 is a diagrammatic diametral vertical transverse section through the wash assembly 41 of the apparatus 10.

FIG. 3 is a diagrammatic longitudinal view of the interior of the apparatus 10 piping and wiring and components.

FIG. 4 is a perspective top and front and side view of the exterior of apparatus 10 with pump chamber door 37 open.

FIG. 5 is a diagrammatic enlarged partly broken away perspective view of portions of the filter 16, with the zone 5A and 5C thereof shown at a greater enlargment than is provided for the adjacent zones SB and SD of FIG. 5.

Table I gives dimensions and characteristics of components of one embodiment of the apparatus 10.

TABLE I Assembly 12' DESCRIPTlON OF THE PREFERRED EMBODIMENT The apparatus 10 comprises, in operative combination, a housing and frame assembly 12, a mechanism assembly 14 and a power source 18. An automobile car filter, 16, is treated by mechanism 14 and releasably held by part of the mechanism 14 and part of the housing 12: power source 18 is operatively connected to the mechanism assembly 14.

The assembly 12 is generally a rectangular box, the walls of which have openings, and closures for said openings and chambers within the box. Assembly 12 comprises a rigid vertical rectangular front flat wall 21, a rigid vertical rectangular flat rear wall, 22, parallel to and the same size as the front wall 21, a rigid vertical rectangular flat exterior left wall 23, and a rigid vertical exterior rectangular flat right wall 24, a flat rectangular top wall 25, and a rigid floor 26. The walls are firmly joined at their edges to form a hollow firm shell. The interior of the assembly 12 is provided with a left interior vertical wall 27 and a right interior vertical wall 28; walls 27 and 28 are each fixed to the front wall 21 and the rear wall 22 and provide for definition and separation of chambers lateral thereto and therebetween. A rigid horizontal wall 29 is located between the walls 21 and 22 and is firmly fixed to the interior surfaces of walls 21 and 22 and 24 and to the top of wall 28. I

A wash chamber 31 of assembly 12 is located between and bounded by the walls 29, 24, 22 and 21. A pump chamber 32 of assembly 12 is located below the wall 29 and between walls 21, 22, 24 and 28 and is bounded by such walls; this pump chamber has various electrical timing elements and a pump therein. A liquid clarification chamber 33 of assembly 12 is bounded by walls 23, 22, 21 and 27. A rigid flat imperforate wash chamber door, 36, is located in a matching opening 39 therefor in the top wall 25 and is hingedly affixed by hinges 30 to the rear side of that opening.

A rigid rectangular pump chamber door 37 is hingedly located in a corresponding rectangular hole 34 in the wall 24. A lock 37A is provided for this chamber as coin collector 73 is located therein. A clarification chamber door 38 is hingedly located in a corresponding hole 38A therefor on the top wall 25 and provides access to and closure for the chamber 33.

The mechanism assembly 14 comprises a wash assembly 41, a clarification assembly 51 and a control assembly 71.

In operation of the apparatus an air filter 16 is located in the wash assembly 41.

The filter 16 comprises an annular filter wall 121, an imperforate annular lower ring 123, an upper imperforate annular ring 125, an outer perforate expanded metal grid 127 and an inner rigid highly perforated grid 129. The wall 121 is formed of a very air-permeable porous yet substantially water-repellent water-impermeable paper which permits air to pass therethrough and catches dirt and dust particles mechanically as well as by chemical absorption or adsorption at the outer surface of such material. The wall is formed in a series of similar radially extending vertical denticulated folds as 131, 132, 133, 134, 135, 136, 137, 138 and 139. Folds 135139 are shown enlarged in zone FIG. 58 to show details of the treated filter 16.

Each of folds as 131-139 of the filter wall 121 is firmly fixed at its top and bottom edges to the top and bottom annular rings 125 and 123 respectively. The surface of walls 127 and 129 are about 90 percent perforations or openings and 10 percent solid support element and are firmly fixed at their top and bottom to rings 125 and 123; such rings are usually (fl") 7 in. LB. and 8 in. OD. Each of the folds as 131, 132, 133, 134 is formed similarly to folds 135- 139. There is, for each of folds 135, 136, 137, 138, 139 a left side element 145, 146, 147, 148 and 149 respectively and a right side element 155, 156, 157, 158, and 159 respectively.

Each ofthe pairs of fold sides forming a fold as 145 and 146 encompass between them a narrow recess 165 open to the interior of the filter, the similar walls 146 and 156 bound an interior recess space 166 open on the interior to the cylindrical space within the filter 16; similarly walls 147 and 157 bound a similar recess space 167, walls 148 and 158 bound interior recess space 168 and walls 149 and 159 bound an interior recess space 169. Each ofinterior recess spaces 165, 166, 167, 168 and 169 are similar and are vertically elongated and have substantially the same shape and size from the top to the bottom; at the top, ring 125 bounds each recess space: at the bottom, ring 123 bounds each recess space. Space 165 is separated from the exterior of the filter by the walls 145 and 155: space 166 is cut off from the space exterior to filter 16 by the walls 146 and 156 and correspondingly for spaces 167, 168 and 169. Each of the spaces 165, 166, 167 and 168 is quite thin, being about Vs" (il/32") wide and extending radially the full radial width of the annular portion of the ring of the filter, which is about l to 2 inches long, measured radially.

Between interior recess spaces 165 and 166 is located an exterior recess space 175 open to the exterior of the filter; between interior recess spaced 166 and 167 is located an exterior recess space 176 open to the exterior of the filter; between interior recess spaces 167 and 168 is located an exterior recess space 177 open to the exterior of the filter; between interior recess spaces 168 and 169 is located an exterior recess space 178 open to the exterior of the filter. Each of the spaces 175, 176, 177 and 178 is, in actual operation of the apparatus about Ms wide, about 1% to 2" high and about I" to 2" deep and in the usual operation of used automotive air filters, filthy on its inside, as shown by accumulations 18], 182, and 183 (on outer surfaces of walls 155 and 146) in 175; 186, 184, 185, in 176; 187, 188, 189, in 177; and 190, 191, 192, in 178; to such an extent that even a bright light is not visible therethrough.

Assembly 41 comprises a top plate locator assembly 110 and a rotatable filter support and wash assembly 150 and a rotatable filter drive assembly 152, cooperatively combined.

The rotatable filter support and wash assembly 150 comprises line 43, plate 45, pulley 90, wash lines as 81, 82, 83, and 84, and nozzles as 141, 142, 143, and 144, in operative combination.

The assembly 150 comprises a centrifugal pump 42 with a rigid vertical outlet line 43. The outlet line 43 feeds into hole 44 in the center of a rotatable circular rigid fiat-topped imperforate (except for the hole) rotatable filter base 45 which serves to rotatably support the bottom of an annular air filter as 16. The top edge of the filter 16 is covered by and supports a circular axially rotatable rigid flat bottomed imperforate filter cover plate 46. A drain board 47 with a smooth flat top surface is continuous with and extends from the left hand (as shown in FIG. 3) side of panel 29 to over the top of wall 27 and extends into the top upper portion of clarification chamber 33. Assembly 150 also comprises plate 45 and nozzles141-144.

The upper end of the line 43 is a rigid pipe; it is firmly located by a bracket 88 therefor which bracket in turn is firmly supported by the horizontal panel 29. The pipe 43 continues upward into a cylindrical bearing 100. The bearing 100 is formed of an outer cylindrical sleeve and race 101 and an inner cylindrical sleeve and race 102, sleeves 101 and 102 are coaxial with each other andwith the center of the line 43. Conventional roller bearings 103 are located between the sleeves and races 101 and 102, a water-tight annular cover plate 104 extends over the top ofelements 101, 102 and 103.

Line 43 from the pump 42 is provided with several lateral branch lines as 81, 82, 83 and 84; each branch line 81, 82, 83 and 84 has a nozzle 141, 142, 143, and 144 respectively at its discharge end. Each of these nozzles is located in chamber 31 in a position in a flat horizontal circle coaxially disposed about the center of plate 45 at equal heights radially of plate 45 and equispaced apart from each other. Each nozzle is directed horizontally and centrally toward the upward projection of the central vertical axis of line 43 with which axis the central longitudinal axis of the annular filter 16 is also coaxial when located between plates 46 and 45.

Each nozzle as 141, is arranged so that its spray is about Ma" to A" wide (i.e. about the same as the horizontally measured width of the recess which it usually treats) and 2" high. The filter drive assembly 152 comprises motor 91, its switch control 72, and pulleys 93, 94, and 90 and their belts. Electrical drive motor 91 is firmly located on a bracket which is firmly fixed to rear wall 22. A horizontal rotatable pulley 93 is supported by and attached to the vertical drive shaft 92 of the motor 91 and drives a rotatable horizontal pulley 94 rotatably supported on a bracket 98, which bracket 98 is firmly supported on the walls 21 and 22. The horizontal rotatable pulley 94 is connected by a vertical shaft 96 to a horizontally disposed rotatable pulley 95 the top of which is at the level of the bottom of the plate 45. A lower plate pulley 90 is firmly fixed to the bottom of the plate 45 and to bearing 100. Pulley 90, the bottom plate 45, bearing and plate 46 are coaxial. A standard V-belt 97, functionally and operatively connects the pulley wheel 95 with the pulley wheel 90; thereby the motor 91 serves to drive, at a steady rate of about 18 rpm. the plate 45 through the train of pulleys 93, 94 and 95. The pulley 95 is located roughly halfway between the walls 21 and 22 and between the openings 39 and 38A.

A pump inlet liquid line 62 is operatively connected to the inlet of pump 42. The pump 42 is operatively connected to the pump motor 63 and driven thereby. The pump motor 63 is operatively connected to a switch 77 therefor and through that switch to power source 18 via coin collector switch 72. A fan 65 and its motor 64 are preferably located in electrical chamber 35 of assembly 12. The motor is firmly fixed to and supported by brackets 68; each such bracket is fixed to the walls 21 and 22. An electrical air heater coil 66 is located in a cylindrical heating chamber 69 which has imperforate side walls, an open bottom with sides that act as a skirt for the fan and extends radially thereof, and an upper outlet duct 67 which operatively connects to the line 43 through valve 79A.

Placement of coins in a standard slot machine coin collector 70 and actuation of the collector actuate switch 72 of a sequence control assembly 71. Switch 72 is operatively connected to power source 18. The coins collected go into the coin collector box 73; collection box 73 is located in chamber 32and reached through hole 37; the switch 72 is thus actuated by placement ofa coin in the coin collector 70. The switch 72 also includes a timer assembly. The timer assembly is operatively connected to an air control relay switch 78 which is operatively attached to a relay 79 (powered by line 18) which controls the valve 79A in the heater line 67 and opens it when the switch 78 is actuated; switch 78 also operates as a relay to then actuate the fan motor 64, which motor actuates the air fan 65 -to draw up air through holes 89 in the bottom floor and force it through the duct 67 and line 43.

The clarification assembly 51 comprises a vertically spaced series of laterally overlapping lipped clarification plates 52, 53, 54, 55 and 56 each with a smooth imperforate flat top surface; each such plate has three fixed edges and a free edge; one f r ont ed g e is fixed to wall 22, the other rear edge is fixed to wall 21; one side edge is fixed to wall 23 or to wall 27 and the free edge, as right hand free edge 50 of plate 52, extends between walls 21 and 22 and is located between walls 23 and 27. The right hand edge of plate 52 extends through the left hand free edge of plate 53, the free left hand edge of plate 53 extends to left of the right hand free edge of plate 54; the left hand free edge of plate 55 extends to the right of the right hand free edge of plate 54 and to the right of the right hand free edge of plate 56. A sump 57 is located below plates 52- 56 and walls 23, 27, and walls 24 and 26. A heater coil 58 and a thermostat sensor 59 are located therein and are supported on wall 27. The thermostat sensor is operatively connected to the thermostat control 60. The control 60 is operatively connected to a standard electrical relay 61 and relay 61 is connected to the power source 18 and to the coil 58.

A flexible water tight seal 99 surrounds the shaft 96 and is securely connected with the top of plate 47, it permits that the plate 47 may move upward and downward about the pin 107 provided in the right end thereof which permits the left end of plate 47 to pivot up and down depending upon the weight of water thereon and actuate a valve 62A in line 62 to decrease flow therethrough as weight of liquid on plate 47 increases. Shaft96 moves in a slot elongated from left to right as shown in FIG, 4 in the otherwise imperforate plate 47 so that the geometrical relationships between the pulley 93, 94, 95 and 90. remain unchanged notwithstanding movement up and down ofthe left end 109 of the plate 47. Top plate locator assembly 110 comprises axially rotatable rigid flat bottomed imperforate cover plate 46, a rigid horizontal bar handle 111, a shaft 112, a sleeve 113 for the shaft 112, a spring 115, a spring base 116, a brace 117 with afoot 119 and brace upright 118. The shaft 112 is a rigid cylindrical shaft, the handle 111 is a rigid bar and is firmly attached at the center thereof to the top of the shaft 112 and forms a T shape therewith. The sleeve 113 isfirmly located in cover 36 by a bracket plate 113A. The interior of the sleeve 113 has a smooth sliding fit around the shaft 112. A helical compression spring 115 is wound around the-shaft 112 and extends from the base 116 to the bottom of the cover 36. A base 116 is fixed to top of plate 46 and to bottom of shaft 112; it forms a seat for the spring 115 and provides for continuous and even compression of the spring 115 between the top of the rotating plate 46 and the bottom of the plate 36. A rigid L-shaped arm 218 extends horizontally from top of portion 118. Base 119 is rigidly and firmly fixed to the top of cover 36. The top of the arm 218 is concave upward and the-shaft 112 is located a lesser distance from end of arm 218.than the distance from the center of the shaft 112 to one end, as .114, of the handle 111. Accordingly, as shown in FlGS. 1 and 4, in the stage of operation where the cover 36 is raised, one end, as 114, of the handle 111 stably rests in a concave recess in 218 atop of upright 118. This location of the handle l 11 is effected by compressing the spring 115 by drawing the handle 111 away from the base 36; this raises the plate 46. from any filter as 16 in chamber 31 and moves the plate 46 close to the cover 36. This structure also permits the cover 36 with plate 46 supported thereon to be closed without any contact between the plate 46 and the filter element 16 in chamber 31 until after the cover 36 is in position with the longitudinal axis of shaft 112 coaxial with annular filter 16 and latch 40 closed as in FIG. 3. Handle 111 may be then released from its support by the upright 118 and the plate 46 be then, by the force of the spring 115, brought into a firm yet yieldable contact with the upper edge of the filter16, as shown in FIG. 2.

In operation of the apparatus 10 liquid 19 from sump 57 moves upwards from the line 43 into the chamber 199 formed by the filter wall 121, annular support rings 123 and 125 the top surface of wall 45 and the bottom surface of wall 46.

The liquid 19, which is under pressure and passes the pump 42 and through the hole 44 in the plate 45 is restrained from escape past the edges of rings 123 and 125 and through wall 121 of the filter 116. The downward pressure of the plate 46 on filter 16 is provided by the compressive force of the spring 115. The compression of the spring effects a force between the cover 36 in the plate 46 of about 10 lbs. the result of this is that, with a 7 in. inside diameter of filter 16 there are about 38.6 square inches of water under the plate 46. This amounts to only about A of a pound per square inch gauge pressure against the flow of the water from the line 43 to raise the plate 46; nevertheless this small resistance to flow plus the rate of flow into chamber 199 does provide that the water entering through the hole 44 fills all portions of the space 199 including the interior recess spaces as 166, 167, 168 and 169 of filter 16.

In the normal operation of the apparatus the plates 45 and 46 and handle 111 rotate at a steady 18 rpm; accordingly all of the lateral projections of the filter 16, such as the junctionsof wall 146 and 156 and the junctions of wall 147 and 157 and. the junction of walls 148 and 158 move at a steady velocity past the nozzles 141, 142, 143 and 144 of which 141 is shown in the diagrammatic enlarged view (Not to scale) in the enlarged portion 58 of FIG. 5. As shown in FIG. 5 the left edge of the spray of water which first contacts the filter wall 121 strikes one wall such as 156; it clears away from the surface 186 some of the debris corresponding to 181 in the space 175. As the filter surface 121 moves in the clockwise direction shown by the arrow 194 in FIG. 5 the water spray is then able to'strike the debris accumulated at the bottom or inner portion of the same exterior recess space 176; this action is shown for the striking of accumulation 188 in the cavity. 177; as the water which reaches portion 188 passes along the outer portion of the surface 157 it provides several vortices in the region 188 and such vortices clean out some of the dirt there remaining; there is however a cutting jet action and not a direct compression against accumulations as 189 on surface 148. As the filter moves to the next position, (from the posi tion shown as 177 in FIG. 5 to the position shown for cavity 178 in H0. 5,) the right hand portion 197 of the spray 196. contacts the remaining accumulation of dirt 192 on the outer portion of the wall 149 and the force of the spray is then also obliquely applied to 192 and 149 at that time and position. The full force of the liquid pressure in each nozzle as 141 is confined to a band only a total Ma" wide and perhaps 2" high; each such stream strikes the surface of wall 121 as above described with considerable scrubbing force, the stream of water from each nozzle as 141 impinges upon the outer sur-v faces of wall 121 and the debris located there with the full force of the velocity resulting from the immediate relief of the pressure in the nozzle, with the transformation of that pressure energy (about 15 lbs. per square inch gauge) against the portions as 155, 146, 156, 147, 157, 148, 158, 149 and 159 of the wall 121 of the filter. While such walls are constructed to let air pass rapidly therethrough for the efficient operation of an internal combustion engine to which that filter is attached, the water in chamber 199, being a freely flowing fluid, contacts and supports all the interior surfaces of interior recess cham bers as 165, 166, 167, 168 and 169 and all the like surfaces notwithstanding that these recess chambers are thin and elon. gated, thus the force of each jet as 141 is largely met by the mechanical support of the portion of the thin wall 121 provided by the liquid 19 in the chamber 199 and the recesses continuous therewith and the pressure thereof due to therestriction to free flow out of chamber 31 provided by spring 115 and plates 45 and 46 in rings 123 and 125. Liquid 19 provides thereby a strong scrubbing action on the portion of the wall of the recess as 177 and the dirt accumulations there located without damage to the wall 121 for a period of 3 minutes.

The detergent used in liquid 19 is Tide (registered trademark of Proctor & Gamble) the composition thereof is, generally, an anionic synthetic detergent and, more particularly, a mixture of water-soluble salts of sulfuric acid reaction products of alkyl and substituted alkyl compounds, containing 8 to 18 carbon atoms in the alkyl group characterized by their high solubility in water, described in U.S. Pat. Nos. 2,712,529; 2,618,608 and 2,396,278. It is used in liquid 19 in the amount of /2 cup per 30' gallons of water; weight of /5 cup 1.5 ozs. 45 grams :5 percent.

The temperature of the water in sump 57 is kept at about 60- 70 F. in cold outdoor weather (with apparatus located out of doors warming of liquid 19 is required). This amount and type and temperature of detergent is, because the detergent is intended for use in hot water of at least 120F., and at usual concentration of /2 cup per gallons of water, of limited detergent power; it produces for example substantially no suds or foam. However, it does serve, as a jet, to dislodge dirt and debris from exterior recess spaces as 175, 176, 177, 178 and keeps such debris of filter l6 suspended in the turbulent liquid as at 188 and serves to carry such debris to' the clarification chamber 33. However, the dirt suspending power of such liquid is limited and, as the suspension of debris and liquid reaches sump 57 the debris settles out and the liquid is returned via pump 42 to chamber 31. Periodically the large sump discharge valve 200 at the bottom of sump chamber 57 may be opened to discharge debris therefrom, and additional water added to chamber 33 via opening 38A.

ln operation of the apparatus 10 the to-be-treated filter as 16 is placed in chamber 31 with the door 36 open to locate filter 16 therein with the central longitudinal axis of the filter 16 coaxial with the vertical axis of pipe 43 and the axes of rotation of plate 45, and plate 46 and shaft 112.

The location of orifice 44 allows this to be done with adequate accuracy by visual observation in the standard apparatus described hereinabove and in Table l. The door 36 is then closed. A releasable spring latch 40 in wall near edge of opening 39 engages the free edge of door 36 and holds it in position as shown in P16. 3; the handle 111 is then pulled upward from door 36 turned and released from its engagement with the recess in the top of arm 218, which arm 218 is rigidly attached to portion 118 of brace 117. The spring 115 then urges the bottom of plate 46 into contact with the top of the filter 16; the shaft 112 then being coaxial with the longitudinal axis of plate 46; line 18 is operatively connected to a source of nominal l 10 volt alternating current (usually 1 l5-l20v), A coin is then placed into collector 70, and the coin collector activated by being pushed inward; the coin is collected and switch 72 activates pump motor 63 and plate drive motor 91 as above described. The liquid 19 from sump 57 is driven vigorously against the outer surface of the filter 16 and at an angle to those surfaces from the several nozzles, as 141, 142, 143 and 144 while the liquid within chamber 19 helps support the filter element walls against the action of such jets. The washing action of the liquid 19, at an angle to the surfaces on which the accumulations of dirt had grown, serves to dislodge the accumulations without harm to the filter wall. This action is continued automatically for three minutes, then the timer in assembly 71 cuts off the connection of power to motors 63 and 41. The rotation of plates 45 and 46 at about 18 r.p.m. and the action of two to fourjets as 141 and 142 on each portion of the filter wall 121 most adjacent to each such jet serves to effect a removal of debris from the exterior surface of wall 121 of filter 16; also, there is some slight washing action of liquid 19 to remove some small amount of accumulation from the pores of wall 121. However, the greatest amount of accumulation of clogging debris is removed from the outer surface of the filter rather than from the interior volume thereof.

Upon completion of the washing action in apparatus 10 at above 40F. ambient air temperature the latch 40 is released and the filter 16 removed from chamber 31. Most of the water in the chamber 199 and on the peripheral surface of wall 121 drains away long wall 29 to chamber 33. The thus washed filter is then replaced on the automobile from which it came; operation of the engine of that automobile with the filter in its normal position for operation of the automobile therewith draws air through the filter wall and, as the engine operates and draws air through filter 16, water adherent to or carried by the filter 16 is evaporated and otherwise drawn away therefrom leaving a washed and dried air filter. The above description of operation applies where the temperature of the air is above 40F.

When the ambient air in the neighborhood of apparatus 10 is colder than 40F., the heater 66 and fan 65 are placed into operation by switch 78 after the pump motor 63 and drive motor 91 are disconnected from power source 18. The fan 65 and heater coil 66 operate for two minutes to dry out the filter and avoid icing of the engine.

The usual geometry of location of the jets as 141-144, at a distance from the axis of conduit line 43 that is greater than the radius of plates 45 and 46 (about 7 in. in the particular embodiment 10) and the size of the usual filter (about 5 inches maximum outside radius) and the number and spacing of folds or denticulations in the filter wall 121 (about Vs in. to /2 in. width between walls as 155 and 146), provides that each of the liquid jets, as that shown issuing from nozzle 141, strikes the wall 121 of the filter as 16 at angle from 0 to about a maximum of 15 for its full height (usually 1% to 2 inches).

An annular wear plate 116A is provided between the top of spring and bottom of door 36 to minimize effect of wear on door 36 of rotation of plate 46, against which (plate 46) spring 115 bears and which rotates together with filter 16 and the plate 45 during the operation of apparatus 10.

The Tide composition used, above briefly described, also contain sequestering agents, as calcium sequestering phosphates which serve to prevent deposits of salts from hard water, used for liquid 19, from depositing on the surface of the filter wall 121 and remaining there after the cleansing treatment thereof as above described and also to break up and remove such similar salts that may develop on the filter wall 121.

By calcium sequestering phosphates is meant water-soluble salts of phosphoric acids which are poorer in water of constitution than orthophosphoric acid, such as tetrasodium pyrophosphate, pentasodium triphosphate (sometimes referred to as tripolyphosphate), hexasodium tetraphosphate, and hexasodium hexametaphosphate, as well as the various corresponding acid salts, such as disodium dihydrogen pyrophosphate, or the products of adding small amounts of free acid to the completely neutralized salts. These salts are deemed capable of repressing calcium ions in aqueous solutions: hexasodium tetraphosphate" and hexasodium hexametaphosphate are placed in quotation marks to indicate that the salts so designated may be mixtures rather than the pure chemical compounds. The tetraphosphate is that compound or mixture which is described in US. Pat. 2,031,827 and the hexametaphosphate is the glassy variety sometimes called Grahams salt which is described in US. Pat. 1,956,515.

The material (Tide) also contains, as brought out in US. Pat. 2,712,529, a corrosion inhibitor some 4 percent to 25 percent (by dry weight of the detergent) of solubilized silicate solids such as sodium silicate having a SiO /Na O ratio of 1.8 to 2.6 to protect the interior parts of the pump and other parts of assembly 10 and also to avoid corrosion of the metal parts ofa filter as 16.

The dimensions of filter 16 are only those of an exemplary filter, as the size thereof varies from one user of apparatus 10 to the next.

Drain board 47 is a rigid imperforate water-proof board, it extends from a water-tight contact with the left edge of wall 29 downward and (as shown on FIGS. 1 and 3) leftward. It is provided with a flexible seal 47A that joins the rear edge of plate 47 in water-tight fashion to wall 22 and a similar seal 47B that joins the front edge in watertight fashion to wall 21. Board 47 is, in the preferred embodiment, of apparatus 10, pivotally supported at its right end on a rigid pin or rod 107. Rod 107 extends from wall 21 to wall 22 and is supported thereon. A rigid Z-shaped bracket 108 is firmly fixed to wall 27. An ear 206 is firmly fixed to the bottom of board 47. A rigid rod 204, threaded at its upper end, is pivotally fixed to the ear 206. Rod 204 is operatively connected to and operates adjustable valve 62A in line 62. Rod 204 passes through a hole in control arm 212. The rod 204 operates the adjustable valve 62A in line 62 to close it on downward motion of the rod 204. This occurs when edge 109 of plate 47 moves too far down. The lower portion of rod 204 is slidably supported in a bracket 208 that is supported in its front and rear in walls 21 and 22. A rigid pivot support rod 210 extends from wall 21 to wall 22 and is supported thereon. A light rigid control arm 212 is pivotally supported on rod 210 at its right end (as shown in FIG. 3) and on calibration spring 106 on its left end. Control arm 212 has some substantial width, about 2", and has a hole vertically therethrough, through which the rod 204 passes. Spring 106 is slidably located in a light rigid support sleeve 209.

The height of the sleeve 109 is adjustably located on threads provided on the Z-shaped bracket 108. A lock nut 211 is attached to the upper, threaded portion of rod 204 and that nut is supported on arm 212 above the hole in the arm 2l2'and thereby adjusts and holds the height of the plate 47 relative to the arm 212.

Accordingly, on unduly heavy flow of water over plate 47 the inlet valve 62A to pump 42 is choked and the rate of flow to chamber 199 from pump 42 is reduced; the pressure on nozzles 141144 is concurrently reduced. The sleeve 209 and nut 211 are adjustable to provide for such degree of compression as is desired in the spring 106 for any desired rate of flow through the valve 62A.

it is also within the scope of this invention that board 47 be firmly fixed in a downward and leftward sloping position; then adjustment control valve 62A may be removed and a standard plug valve be used in its place. The bottom of line 62 extends downward into sump 47 and has its inlet a foot from the bottom thereof. In this position the liquid that is drawn off by line 62 is free of sediment that collects at the bottom of the sump 57 and is also free of the matter that collects at the top of the liquor in the liquid reservoir or sump 57 within the housing and frame assembly 12.

Although, in accordance with the provisions of the patent statutes, particular presently preferred and exemplary embodiments of this invention have been described in the best mode in which it is now contemplated applying such principies, it will be understood that the operations and constructions shown and described are illustrative and that my invention is not limited thereto.


1. Apparatus for cleansing filters comprising:

in operative combination, a housing and frame assembly, a

mechanism assembly and a power source;

a. the housing and frame assembly comprising an enclosure with a roof thereon, an opening in said roof above and to a wash chamber therein, a door pivotally located in said opening above said wash chamber, and a liquid filter cover plate attached to and located rotatably at the bottom of he shaft and rotatable about an axis, and

means operatively attached to said plate urging said shaft and plate to extend away from said door, a bracket on said housing and frame assembly, an arm on said shaft engaging said bracket and opposing said means for extending said shaft and plate;

said rotatable filter support and wash assembly comprising a rotatable filter support plate within said wash chamber and rotatable about an axis coaxial with said axis of said filter cover plate, a plate liquid inlet means extending through said filter support plate, said filter plate and said cover plate being imperforate except for said plate liquid inlet means, a liquid pump means with a discharge outlet thereof connected to said plate liquid inlet means, a pump liquid inlet means to said pump means, said pump liquid inlet means connected to said liquid reservoir means, a motor operatively connected to said pump means, a nozzle located in said enclosure peripherally to and above said filter support plate and below said filter cover plate, the outlet of said nozzle directed toward the axis of rotation of said filter support plate, the outlet of said pump being connected to the inlet of said nozzle;

a clarification assembly comprising a baffled liquid clarification chamber located between said nozzle and said liquid reservoir means; and

power control means supported on said frame housing and frame assembly and operatively connected to said motor connected to said pump means.

2. Apparatus as in claim 1 wherein:

a. said rotatable filter support and wash assembly comprises also a rotatable filter drive assembly, said rotatable filter drive means comprising, in operative connection, a filter drive motor means, an energy source operatively connected and attached to said motor means, a switch means controlling said motor means, and means operatively connecting said motor and said rotatable filter support plate and wherein b. a plurality of like nozzles are located peripherally of said filter support plate within said wash chamber, the outlet of each of which nozzles is directed toward the axis of rotation of said plate and the inlet of each of which said nozzles is connected to the outlet of said pump.

3. Apparatus as in claim 2 wherein said power control means on said housing and frame assembly comprises, in operative connection, a coin collector assembly and a timer and a switch assembly, said coin collector assembly controlling said timer and switch assembly, said switch assembly controlling said motors for said pump and controlled by said timer.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
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U.S. Classification134/58.00R, 134/33, 134/10, 134/109, 134/99.1, 134/152, 134/143
International ClassificationB01D21/00, B01D46/52, B01D41/04
Cooperative ClassificationB01D41/04, B01D21/0012, B01D21/009, B01D21/0042, B01D21/003, B01D21/24, B01D21/30, B01D21/02
European ClassificationB01D21/00, B01D21/02, B01D21/00N, B01D21/00T, B01D21/24, B01D21/30, B01D41/04