Патент USA US2406733код для вставки
~ Sept;._ 3, 1946. 2,406,733 |_. K. ACHESON SUCTION ‘CLEANER Filed April 26, 1945 ' s Sheets-Sheet 1 INVENTOR. Louis K. Acheson Sept. 3, 1946. 2,406,733‘ l... K. ACHESON SUCTION ' CLEANER Filed April 26,‘ 1-943 "/////////////:/]))}/'//////// I //////A 3 sheets-“sheet?v I _vil! ra /©\ .G .- I NW.II %.|| &.@ ? w“ R a. Q W W / @ @ _m.\k.“Nu“v ‘527i’!Il H‘IMHO I .H m.“HMu.“/,/Pm. \ GEwmww w..mQ “N M Rm.” M M ‘W : ;_ Qu.i._ - ms Mn.___ N.“0.‘ INVENTOR. Iouis K. Acheson Sept. 3, 1946. , |_. K. ACHESON 2,406,733 _ SUCTION CLEANER Filed April 26, 1943 3 Sheds-Sheet 3 1/28 I29 /32 /08 Q8. /// / 103 IN VEN TOR. Louis K. Acheson 2,406,733 Patented Sept. 3, 1946 PATENT OFFICE UNITED I STATES 2,406,733 ‘ SUCTION CLEANER LouisK. Acheson, North Canton, Ohio, assignor to The Hoover Company, North Canton, Ohio, a corporation of Ohio > Application April 26, 1943; Serial No. 484,510 7 1 (01. [183-57) 11 Claims. r . , 2 ’ The present invention relates to suction clean ers in general and more particularly to a new and through the suction-creating fan unit and the speed-reducing means, being taken upon the line novel arrangement of parts in a suction cleaner. 4-4 of Figure 2; and ' \ Figure 5 is a vertical section through a cleaner More speci?cally, the invention comprises an im proved type of suction cleaner in which the dirt 5 constructed in accordance with a second. preferred embodiment ofthe'invention which is character laden air stream is drawn by the suction-creating ized primarily by being’ provided with individual means of'the cleaner through an initial dirt sep suction-creating means for the ?lter-cleaning arator and is exhausted by the suction-creating meansrinto a ?nal ‘dirt-separator, means being The usual modern cleaner embodies a'suction provided which continuously clean the ?nal sep 10 creating unit which draws air from the surface: arator and remove the collected foreign mate contacting nozzle and which moves it to a dirt rial therefrom and transfer it back to the initial ?ltering unit whichlis permeable to air but im permeable to dirt and; which therefore functions It is an object of the present invention to pro vide a new and improved suction’ cleaner, It is 15 to restrain and retain the dirt while permitting the air to escape into the ambient atmosphere. another object of the invention to provide a new This usual type of machine has the objection and improved suction cleaner of the type incor that the dust bag must be cleaned at intervals ‘ porating an initial dirt separator and a ?nal dirt in order that the machine remain operative, for separator. A still further object of the inven tion is to provide a suction cleaner having a plu 20if not cleaned the resistance to the ?ow'of clean ing air through the bag becomes excessive there rality of dirt separators, the ?nal dirt separator by reducing to the point of inoperativeness the being provided ‘with cleaning means. Still an nozzle. separator. ' ’ ' ' ' * ' ~ ' ' other object of the invention is to provide a suction cleaner of the type in which an initial sep @ ?ow of air through the machine. Other-types of arator has its dirt-?ltering actionsupplemented 25 by a ?nal separator, there being continuously op erated means provided which remove the dirt from the ?nal separator and return it to the ini tial separator. .A still further object of the in vention is to provide a suction cleaner of the type having an initial separator from which air is drawn by. the suction-creatingmeans of the cleaner which exhaust substantially cleanair into cleaners have been designed incorporating what is called mechanical dirt-separating means, that is, means which usually rely upon centrifugal force, etc., to effect the separation of the dirt from the carrying air stream rather than vupon the ?ltering action of a ?lter such as a cloth bag. These mechanical separator machines, however, have all been characterized by the objection that they permitted the escape into the atmosphere of a very small'fraction of the dirt carried by the air stream and this escaped dirt was of a type driven rotary ?lter-cleaning nozzle removes the 35 which created a noticeable dust odor. 'Could the escape of this very small percentage of foreign dirt from the ?nal separator and returns it to the initial separator. These and other more speci?c material be eliminated that type of machine would objects will appear upon reading the following have certain advantages for a'mechanical sep speci?cation and claims and upon considering in arator need not be removed to be cleaned but in connection therewith the attached drawings to 40 stead it is necessary only to remove a dirt con which they relate. , tainer or pan which is very easily emptied; Referring now to the drawings in which pre The suction cleaner of the patent to; Bible ferred embodiments of the present invention are 2,247,472 comprises a recognition of this problem 45 and provides a solution which is a material ad ' , Figure 1 is a vertical section through a suction vancement over the prior art. The Bible patent cleaner constructed in accordance with the pres’ provides an initial dirt separator from which a ?nal dirt separator and in which a constantly disclosed: V ._ ent invention; k ’ n = cleaning air is drawn _by the suction-creating Figure 2 is a transverse horizontal section ‘means which in turn exhaust the substantially through ‘the speed-reducing means by which the 50 * clean air into a ?nal ?lter. To prevent the undue ?lter-cleaning nozzle is driven from the main accumulation of foreign material in this?nal motor shaft, being a section taken upon the lines ?lter there is provided a manually operable ?l 2-2 of Figures 1 and 4; ter-cleaning nozzle whichsis connectible to the Figure3 is a section upon the line 3—3 of Fig intake of the initial dirt separator and which, Figure 4 is an enlarged partial vertical section 55 when in operation, functions to clean the ?nal ure 2; V ' I 2,406,733 3 4 separator and to reconvey the foreign material therefrom into the initial separator. The present invention represents an improve ment over the construction of Bible 2,247,472 in that it provides, in a cleaner of the basic Bib-1e 5 partially within the upper end of casing I. The rotation of the motor shaft 28 causes the tandem fans 26 and 21 to draw cleaning air in through the inlet port 23 and to remove the cleaned air upwardly through the inlet I3 into the fan cham type, means which continuously maintain the ?nal ber from which it is exhausted through suitable ?lter in a clean condition and ‘which continuous ports 35 into a surrounding chamber which is ly return foreign material from that ?nal ?lter indicated at 3| and which will be called the ?nal to the initial separator where it can be removed, ?lter chamber for a reason which will become an agglomerating action having taken place in 10 apparent. De?ning the side wall of the ?nal ?l the collection on the ?nal ?lter. In one embodi ter chamber 3| and spaced inwardly from the enclosing main casing I is a cylindrical ?lter ele ment of the invention, as will be hereinafter de scribed, separate suction-creating means are pro ment 32 formed of suitable air-permeable dirt vided for the ?lter-cleaning nozzle and which impermeable material such as ?lter cloth. Fil effect the return of the foreign material from that ter 32 is supported at its lower end by a ?anged nozzle to the initial separator. collar 33 ?xedly carried by the casing 9. At its Referring again to the drawings, and to Fig upper end ?lter 32 is carried by a shouldered portion of a centrally apertured and ?anged ures 1 to 4 inclusive in particular, the ?rst pre plate 34 which seats in sealing relationship upon ferred embodiment of the invention is illustrated. A cylindrical main casing I seats, at its central the lower end of the casing of motor 29 and ly apertured and ?anged bottom plate 2, upon a which is itself ?xed in spaced relationship to the supporting base 3 which seats a removable dirt enclosing main casing I by means of spiders 36 pan or container 4, the upper peripheral edges which may be integrally formed. Collar 33 and of which are in sealed contact with the bottom upper plate 34 form end enclosures for the ?lter plate 2. The upper end of the cylindrical casing 25 chamber 3I and air escaping therefrom must I is closed by a motor hood ,6 which includes an pass outwardly through the ?lter element 32 into inwardly ?anged motor-supporting wall ‘I. Positioned concentrically within the main cas that space between the ?lter and the main cas ing I is a smaller cylindrical casing 9 which is character 31 and which will be referred to as ing I which space is indicated by the reference carried by the inner ‘?anged peripheral edge of 30 the discharge chamber. the bottom plate 2 of the casing I. A transverse Discharge chamber 3'! is closed at its upper closure wall II divides the cylindrical casing 9 end by the plate ‘I and at its lower end by the into a lower whirl chamber I2 and upper fan bottom plate 2 of casing I and the only escape chamber I3, the latter being itself divided into therefrom is afforded by the apertures 38 formed a lower stage and an upper stage by a centrally 35 in the casing of motor 29 upon the opposite sides positioned de?ector I4. De?ector I4 is formed with a multiplicity of ?xed guide'vanes which function to direct the air to the central inlet formed therein and which is indicated as I6. The top of the fan chamber I3 is closed by cover 40 plate I1 of the cylindrical casing 9 while the bottom of the fan chamber is provided with a of the supporting wall ‘I in the hood 6. Air en tering the lower apertures 38 passes upwardly through the motorrcasing and escapes from the upper apertures and effects a cooling of the mo tor in doing so which is desirable. The motor hood 6 above the plate 1 is provided with an ex haust port 38 adapted to receive and seat a dust ing tool unit when it is desired to use the cleaner as a blowing unit and serves at all times as the downwardly extending elongated inlet I8 which reaches downwardly beyond the mid-portion of the whirl chamber I2. Vertically spaced spiders 4 01 cleaner exhaust port. Incidentally, the driving I9 within inlet I8 support a downwardly extend ing rod 20 carrying a transverse closing plate 2| at its lower end and a strainer 22 immediately below the ‘lower spider I9. Plate 2'! is spaced inwardly from the wall of casing 9 and provides a peripheral opening through, which the foreign material can drop from the whirl chamber into the dirt pan 4 while the strainer .22 prevents the passage upwardly into the suction-creating fan chamber I3 of large size foreign objects. The inlet of the cleaner comprises a port 23 which is adapted to receive and seat the cleaner end of a dusting tool hose 5 which at its outer end carries a suitable cleaning nozzle l0. Inlet 23 passes inwardly through the outer cylindrical casing I and connects directly to an inlet cham ber 24 which opens tangentially into the whirl chamber 12. The construction is such that air entering through the inlet 23 and chamber 24 enters the whirl chamber tangentially resulting in a circular rotary movement of the air which tends to throw the foreign material outwardly and permits it to drop downwardly and into the dirt pan 4. Within the suction-creating fan chamber 13 is positioned a two-stage fan comprising a lower rotary fan 26 and an upper fan 2?, both carried by the downwardly depending shaft 28 of a mo tor 29 which is carried by the wall ‘I and is posi motor 29 is provided with incoming power leads 4| which are connected to a suitable manually operable switch 42 to enable the operator to con trol the operation of thelmotor and so of the 50 entire cleaner. , The machine which has hereinbefore ‘been de scribed comprises a completely operative cleaner, but one which has'the inherent defect that no means have been provided to clean the ?lter 32. 55 To accomplish this desirable result there is pro vided, in accordance with applicant’s invention, an elongated nozzle 6.16 the length of which is equal to the height of the ?lter element 32 and which is adapted to make sliding contact there 60 with. Nozzle 43 has a ?lter-contacting opening or mouth which contacts only a limited area of the ?lter element 32 in any one position and accordingly means are provided to move the C) Ul nozzle relative to the ?lter. This is accom plished by supporting nozzle 46 by a rotatable‘ conduit seat 41 which encloses the vertical sleeve 49 housing the motor shaft 28. Conduit 4‘! is formed at its inner end with a downwardly fac ing circular seat which is rotatably mounted upon a supporting bearing 5! carried by the sim ilarly shaped upwardly opening mouth of a sta tionary conduit 52. The latter conduit is mount ed on the top plate I] of casing 9 and extends tioned partially within the motor hood 9 and 75 across the top and down the side thereof to con 2,406,733 which conduit 52 opens at the intake chamber 24. nect to the inlet chamber 24 of the whirl cham ber- I2. ~ ‘ Aslpreviously described, the velocity of the ?lter , cleaning nozzle 46 is relatively slow as the result of the speed-reducing mechanism which is housed within housing 51 and which has been described in ' It is undesirable that the ?lter-cleaning nozzle 46 should rotate and move vover the vsurface of the ?nal ?lter 32 at a speed approaching the speed of rotation of the fan or motor shaft 28 and accordingly speed-reducing means are provided to detail above. ~ The continuous cleaning of the ?nal ?lter 32 prevents the back pressure in the chamber 3| enable the motor to drive the nozzle but at, a from building up beyond a reasonable point which reduced speed. These means, including a‘worrn 56 carried by the motor shaft 28, are positioned 10 can be controlled by the speed of movement of the nozzle and by the volume of air ?owing there within a housing 51 located immediately below through. The return of the escaped foreign ma the motor 29. Shaft-enclosing sleeve 49 is pro terial to the initial separator I2 makes possible vided with a slot-like opening 58 adjacent worm substantially the entire removal of the returned 56 and extended through this opening and into material for, it has been found, this material in engagement with the worm 56 is a gear 59 carried collecting upon the ?nal ?lter 32 becomes ag~ by a transverse horizontal jack shaft 6| which is glomerated, thereby increasing in size and mass. itself rotatably mounted in bearings 63 carried by After the machine has been used for a con brackets 62 supported from the top wall of the side'rable period of time the dirt container 4 will housing 51. Shaft 6| itself carries a worm 64 at a point spaced from its gear 59 and this worm'in 20 become ?lled with foreign material and should be emptied. This can be accomplished by re turn meshes with a gear 66 carried by a second moving the top casing I from the base 3 thereby and vertical jack shaft 61. Shaft 61 is rotatably enabling the pan 4 to be removed upwardly from mounted in bearings 68 carried in the upper and the base 3 or, if desired, pan 4 may be slid trans lower walls of housing 51 and is continuously ro versely from the base, depending upon the typ tated. A gear 69 is ?xedly connected to shaft of construction which is used. > ' 61 near its lower end and transmits the continue Referring now to Figure 5 in particular, the ous driving force from shaft 61 to a large gearv second preferred embodiment of the invention is H which carries a bearing 12 rotatably seating - illustrated and differs primarily from the ?rst upon the sleeve 49. Gear 69 is ?xedly connected to the conduit-seat 41 of nozzle 46 by means of 30 described embodiment in that a second and sep suitable rivets 13. A coil spring 14 surrounds the sleeve 49 and exerts a downward force upon the top of the bearing 12 and thereby forces the con duit seat 41 against its supporting bearing 5|, a suitable shoulder 16 being provided upon the 35 sleeve 49 to seat the spring. - arate suction-creating fan unit is present which provides the suction for the ?lter-cleaning nozzle. In this second preferred embodiment of the in vention the cylindrical main casing is referred to by the reference character I0 I, its ?anged bot tom plate by the character I02, and its support ing base by the character I03. A dirt pan I04 is positioned within the base I03 and, sealed to the bottom plate I02 of the main casing. In this em The operation of this ?rst preferred embodi ment of the invention is as follows: The operator having attached suitable dusting tools including a ?exible hose 5 and a nozzle I0 to the inlet 23 bodiment, however, the motor is not positioned at of the machine, closes the electrical switch 42 thereby causing electrical current to pass through the driving motor 29. The rotation of the motor ‘ the top of the device and accordingly there is no shaft 28 immediately ensues and with it the rota tion of the suction-creating fans 26 and 21 within the chamber I3. Air and dirt are drawn through motor hood at the top of the casing IOI which instead is closed by a top plate I06 which is cen trally provided with a suitable removable cover \ plate I01. An inner cylindrical casing is indicated by the the cleaning nozzle, the dusting tool hose, the inlet port 23 and into the whirl chamber I2, in which its circular motion causes the foreign ma terial suspended therein to be thrown radially out ward under the action of centrifugal force and it drops downwardly and around the peripheral edge of the plate 2| into the pan 4. The clean air is drawn upwardly through the inlet I8 by, the action of the fans 26 and 21 and is exhausted 01 Ur from the second stage fan 21 into‘the ?nal filter chamber 31. From the latter chamber it passes outwardly through the ?nal ?lter 32 into the dis charge chamber 31 leaving upon the ?lter 32 that very small percentage of foreign material which has escaped from the whirl chamber I2. The air continues on its way and passes upwardly and through the ports 38 of the casing of motor 729 and ?nally makes its exit at the top of the ma chine from the motor hood 6 via the exhaust port 39. , During this operation, the ?lter-cleaning nozzle reference character I08 and a separating wall I09 divides the casing I08 into a whirl chamber III and thereabove a fan chamber “2, there being a downwardly extending inlet IIO for the fan chamber which is identical to that present in the ?rst embodiment. Fan chamber “2 is di vided, as in the ?rst embodiment, by the sta tionary de?ector I I3‘ into a ?rst stage and a sec ond‘stage which are connected by an inlet II4. I The suction-creating fans in this embodimentare represented by the reference characters H6 and H1 in the ?rst and second stages, respectively, .both being carried by the depending motor shaft 60 here indicated at I I8. The top of the cylindrical casing I08 and of the fan chamber H2 is formed 'by a plate |I9 which in this instance directly supports the cleaner motor I2I, the enclosing casing of which is flanged, as at I22, for heat‘ radiation purposes. As in the ?rst embodiment the upper or second ' stage of the fan discharges into a ?nal ?lter chamber which is here indicated by the reference character I23. The bottom wall of chamber I23 isv formed by a ?anged collar |24 secured to the 46 has been moving at slow speed in a circular path and along the interior dirtied surface of the ?lter 32 and has effected the reversal of the inner cylindrical casing I08 and the top wall by direction of the flow of air through the ?lter 32 a. ?anged plate |26 which is secured at its aper in the contacted area. This reversed ?ow of air is tured center to the cylindrical casing I21 which drawn from the discharge chamber 31 into the is carried by the top wall I06 of the casing NH. nozzle 46 and passes through conduits 41 and 52 ‘under the suction of the ‘whirl chamber I2 into 75 The side wall of the ?lter chamber comprises the 2,406,733 > 7 ?lter element I28 which is ?xedly secured to the top and bottom walls I24 and I26 and is spaced concentrically within the enclosing cylindrical casing, Iiii which provides therearound the dis charge chamber I29, as in the preceding embodi ment. In this embodiment the main casing I BI is formed with both the inlet port ISI, which ex 8 casing I 21. Here, as in thew?rst embodiment, however, the foreign material removed is con veyed via the conduit I43 into the whirl chamber at the inlet chamber I32. The advantage of the separate suction-creating means for the ?nal ?lter-cleaning nozzle lies in the entire air-mov ing ability of the main fan unit being available tends therethrough into an inlet chamber I32 for the drawing of air through the ?lter-curtain. , forming a part of the whirl chamber III, and I claim: 1. In a suction cleaner of the type having an alsowith a discharge port I33, there being no 10 initial dirt separator, suction-creating means to draw air from said initial separator and includ The parts which have heretofore been described ing a fan and a motor directly connected thereto, in connection with the second embodiment of the invention represent an operative cleaner with the and a ?na1 dirt separator to receive air from said exception of the ?lter-cleaning means for the 15 suction-creating means; a dirt-removing unit to remove dirt from said ?nal separator and to ?nal ?lter, and in this embodiment of the inven tion these means differ in material respects from transport it to said initial separator and includ ing a movable element, and power-transmitting those of the ?rst embodiment. In this embodi ment the shaft I I8 of the motor extends both and speed-reducing means connecting said mov below and above the casing and at its extreme 20 able element to said motor to actuate said ele upper end carries, within the casing I21’, a plu ment in the operation of said cleaner at a speed rality of rotatable fans I36, I31 and I38 which less than the speed of said fan. are separated by stationary de?ectors I39. Cas 2. In a suction cleaner of the type having an ing I 21,» which is in fact a fan chamber, is formed initial dirt separator, suction-creating means to centrally in its bottom with an intakev I45} to 25 draw air from said initial separator and includ which connects the rotatable conduit seat EM of ing a fan and a motor directly connected thereto, a ?lter-cleaning nozzle I62, a suitable sealing and a ?nal dirt separator to receive air from said bearing I44 being present therebetween. The suction-creating means and including a cylindri outlet of fan chamber I21 connects to a discharge cal ?lter element; a dirt removing unit to remove conduit M3 which extends directly to the inlet 30 dirt from said ?nal separator and to transport it chamber I312 of the whirl chamber VIII. The to said initial separator and including a movable ?lter-cleaning nozzle I42 is again rotated by nozzle, and power-transmitting and speed-reduc speed-reducing means driven by the cleaner mo~ ing means connecting said movable nozzle to said tor I2 I. This speed-reducing‘ means is positioned motor to actuate said nozzle at a speed less than within the housing I55 immediately above the 35 the speed of said fan in a circular orbit in con motor I2I and is identical'with that described tact with said cylindrical ?lter element in the in connection with the ?rst embodiment with operation of said cleaner. the exception that it is inverted, that is,- it is 3. In a suction cleaner of thetype having an reversed end for end being above the motor rather initial separator, a suction-creating fan unit to than below. 40 draw air through said initial separator, a motor The cleaner-actuating motor I2! is again pro having a shaft connected to said fan unit, and vided with suitable incoming power leads Hi3 and a ?nal ?lter interiorly connected to said unit to a manually operable switch I-FI'I which controls receive air exhausted therefrom and including a the ?ow of current to the motor and so renders ?lter element surrounding said shaft; a ?lter it operative or inoperative at the operator’s elec cleaning nozzle interiorly connected to a source tion. Additionally, and as in the ?rst embodi of suction and mounted for movement about said ment, a transverse plate, there indicated by I45, shaft in contact with said ?lter element, and is provided at the lower end of the whirl chamber power-transmitting speed-reducing means con III. necting said nozzle to said shaft to move said The operation of this second embodiment of 50 nozzle during the operation of the cleaner. the invention is as follows: Upon the operator 1i. In a suction cleaner of the type having an closing the actuating switch III'I, having previous initial separator, a suction-creating fan unit to ly attached dusting tools including hose and noz draw ‘air through said initial separator, a motor zle to the inlet port I3I, air is drawn through having a shaft connected to said fan unit, said the dusting tool and into the whirl chamber III , fan unit being positioned between said initial ‘by the action of the suction-creating fans H5 separator and said motor, and a ?nal dirt sep and I IT. The incoming dirt-laden air enters the arator enclosing said fan unit; dirt-collecting whirl chamber III tangentially and the foreign and-removing means movable in said ?nal sep material is separated as in the ?rst embodiment, arator to carry dirt to said initial separator, and the clean air entering the fan chamber IIZ 60 power-transmitting speed-reducing means con through the elongated inlet III}. The cleaned necting said dirt-collecting-and-removing means air is discharged from the ?nal stage of the suc to said motor shaft. .tion-creating fan unit into the ?nal ?lter chamber 5. In a suction cleaner of the type including I23 from which it is exhausted outwardly through an initial separator, a suction~creating fan unit to the ?nal ?lter I28 into the discharge chamber vdraw air through said initial separator, a motor I29 making its way therefrom via the exhaust having a shaft connected to said fan unit, said port I33 into the surrounding atmosphere. fan unit being positioned between said initial As in the ?rst embodiment, the ?lter-clean separator and said motor, and a ?nal dirt sep ing nozzle, here indicated as I42, is slowly moved arator to receive air exhausted from said fan in a circular orbit around and in contact with unit and including a ?lter element spaced radi the interior of the ?nal ?lter I28 removing for ally with respect to said motor shaft; a cleaning eign material therefrom. In this instance, how nozzle movable relative to said ?lter element, air ever, the suction to the ?nal ?lter is provided by conducting means connecting said nozzle in all the separate fan unit positioned above the motor and comprising the fans I36, I31 and I38‘ of the 75 positions to the inlet of said initial separator, motor hood as in the ?rst embodiment. 2,406,733 10 and power-transmitting means connecting said nozzle to said motor shaft. exhaust it in said initia1 separator, and a driving motor connected to said suction-creating units. 6. In a suction cleaner of the type having an 9. In a suction cleaner of the type having an initia1 separator, a suction-creating fan unit to' initial dirt separator, a ?nal dirt separator, and draw air through said initial separator, a motor a cleaning nozzle movable with respect to said having a shaft connected to said fan unit, a ?nal ?nal separator to collect foreign material there ?lter interiorly connected to said unit to receive from; a pair of suction-creating fan units, one of air exhausted therefrom and including a ?lter said units being connected to draw air from said element surrounding said shaft, an enclosing cas initial separator and to exhaust it in said ?nal ing, an inlet port to said initial separator ex 10 separator, the other of said units being connected tended through said casing, and an outlet port ' to draw air through said nozzle and to exhaust to discharge air exhausted from said ?nal sep it in said initial separator, a driving motor, and arator; a rotary cleaning nozzle adapted to ro means connecting said motor to said fan units tate about said motor shaft in contact with said and to said nozzle to actuate same in the oper ?lter element, an air-conducting nozzle seat en ation of the cleaner. closing said motor shaft and supporting said nozzle for rotation, power-transmitting speed 10. In a suction cleaner, an initial dirt sep arator, air-conducting means to conduct a dirt reducing means connecting said nozzle to said laden air stream to said initial dirt separator suc shaft to rotate said nozzle at reduced speed, and tion-creating means to draw air from said initial air-conducting means connecting said nozzle seat 20 separator and including a fan and a motor di to said initial separator. rectly connected thereto, and a ?nal dirt sep 7. In a suction cleaner of they type having an arator to receive air from said suction-creating initial dirt separator, suction-creating means to means; a movable nozzle to remove dirt'from said draw air from said initial separator and includ ?nal separator, air-conducting means connecting ing a fan and a motor directly connected there said nozzle to said initial separator to make avail to, and a ?nal dirt separator to receive air from able the suction thereof to said nozzle and to said suction-creating means; a dirt-removing transport dirt from said nozzle, and power-trans unit to remove dirt from said ?nal separator, mitting means connecting said nozzle to said m0 second suction-creating means driven by ‘said tor. motor connected to said dirt-removing unit to ‘ draw air therethrough, air-conducting means creating means to said initial separator, and power-transmitting means connecting said dirt removing unit to said motor to actuate said unit at reduced speed in the operation of the cleaner. 8. In a suction cleaner of the type having an initial dirt separator, a, ?nal dirt separator, and a cleaning nozzle movable with respect to said from; a pair of suction-creating fan units, one of said units being connected to draw air from ' initial dirt separator, suction-creating means to draw air from said initia1 separator and includ ing a motor, and a stationary ?nal dirt separator including a ?ltering surface to receive air from connecting the exhaust of said second suction ?nal separator to collect foreign material there ~ 11. In a suction cleaner of the type having an said suction-creating means; ?rst air-conducting means to conduct a dirt-laden air stream to said initia1 dirt separator, second air-conducting means to convey an air stream from said ?nal 40 dirt separator to said initial dirt ‘separator, and nozzle means driven by said motor to dislodge foreign material from the surface of said ?nal dirt separator for conveyance through said sec said initia1 separator and to exhaust it in said ond air-conducting means to said initial dirt sep ?nal separator, the other of said units being con arator during the operation of the cleaner. nected to draw air through said nozzle and to 45 LOUIS K. ACHESON.