Wet and/or dry vacuum cleaning unit

Abstract: In a vacuum system for cleaning rugs and floors or other surfaces having a vacuum source (118) and means for employing the vacuum generated by the vacuum source for picking up dirt and other material from said rugs, floors or other surfaces, and further where said system includes a rotatable brush (102) which is adapted to agitate and loosen said dirt and other material, the improvement comprising a closed loop which includes using the air flow pressure (120) from the exhaust side of said vacuum source in a contained flow to perform work functions in said system, including the provision of power to drive said rotatable brush (102). Thus the brush may be powered by a turbine motor (114) positioned within means communicating the exhaust side of the vacuum source with said head assembly whereby the air exhaust drives the turbine motor (114).

Description: The invention relates to an improved vacuum cleaning system. For the purposes of explanation and to differentiate between work forces utilised in the described air flow work system, and as it is intended in this patent where the air flow energy or force is used for either pulling or pushing work, the following explanation is given: AIR FLOW PULLING WORK Where the vacuum motor is sucking or pulling the air, sometimes referred to herein as the uplink side. AIR FLOW PUSHING WORK Where the vacuum motor is blowing or pushing the exhaust air, sometimes referred to herein as the return loop side. A disadvantage of many prior art vacuum cleaning apparatuses is that they do not include air flow systems which deliver clean, filtered air to power their brush turbine motors. In the prior art the air driven motor is commonly placed in the vacuum line up-link prior to filtering and must continuously process all dust, dirt and debris, such as cigarette butts, toothpicks, paperclips and the like in the vacuumed air flow on its way to the filter. These prior art vacuum cleaners with air-driven motors have never become popular because of having to consume all of the above-mentioned dirt and debris, with the resultant nuisance of continuously having to stop the cleaning process to clear the obstructed air motor, as well as the associated high maintenance and repair. US-A-3704482 discloses a cleaning apparatus in accordance with the preamble of claim 1. This apparatus is not a vacuum cleaning apparatus. Instead, it utilises the Coanda effect to cause a stream of positive pressure fluid to push dirt and dust saturated fluid into a suitable receptacle, rather than "sucking up" dirt by means of vacuum or negative pressure. The cleaning apparatus of US-A-3704482 expels its air flow into the atmosphere after filtering. This has the disadvantage of expelling and depositing fine dust, and possibly bacteria, into the atmosphere, the amount of expelled dust and bacteria depending on the efficiency of the filtering. DE-U-8513126 discloses a cleaning apparatus in which excess external air flow is exhausted through an opening in the outer housing below the vacuum motor and the cleaning substance container. EP-A-224055 and GB-A-1111899 both disclose large and heavy industrial walk-behind cleaning apparatus for use in scrubbing hard floors. Both apparatuses comprise squeegees for wet pickup. According to the present invention there is provided a cleaning apparatus, for cleaning rugs, floors or other surfaces, the apparatus comprising: a) a vacuum source having a suction side and a controlled air flow pressure side (exhaust side); b) a pair of spaced apart wheels positioned at the rear of the apparatus and adapted to ride on the rug, floor or other surface to be cleaned; c) a head assembly positioned forwardly of said pair of spaced apart wheels and adapted to ride on the surface to be cleaned; d) at least one rotatable brush within said head assembly; e) means communicating the suction side of the vacuum source with the head assembly; f) a turbine motor; g) means communicating the air exhaust side of the vacuum source with the head assembly, said turbine motor being positioned within such air exhaust communicating means whereby the air exhaust will impinge on and drive the turbine motor; and h) means interconnecting said at least one brush and the turbine motor whereby the turbine motor drives said at least one brush, said means interconnecting being at a right angle to the axis of rotation of the brush; characterised in that: the cleaning apparatus is a vacuum cleaning apparatus having a closed air flow loop; the head assembly is arranged to form the closed air flow loop and is associated with peripheral air containment means for preventing air from entering or leaving around the periphery of the head assembly when it rides on the surface to be cleaned; and the means communicating the suction side of the vacuum source with the head assembly is arranged to provide suction within the head assembly for picking up dirt or other materials. The vacuum cleaning unit with a novel multi-purpose air flow work system of this invention is adapted to be constructed as a wet and/or dry vacuum cleaning unit for cleaning carpets, hard floors, upholstery, et cetera. The novel system may be constructed as a multi-purpose unit to perform all of the cleaning functions mentioned in a single unit, or it may be constructed to perform each individual cleaning function as a single unit, or it may be constructed to perform any combination thereof in a single unit. The novel design features of the cleaning unit of this invention provides important advantages over the devices of the prior art. The design of the novel cleaning unit of this invention is a multi-purpose air flow work system, in that it moves dirt and other foreign matter by suction from the surface being cleaned through a filter. The resulting used clean filtered air is kept contained and then routed back to perform other work functions. This returning clean high velocity air flow is used in aiding the cleaning cycle by air jetting and loosening and moving dirt and foreign matter, then blowing it in the direction of the power brush with its air section/uptake opening. In this way, the dirt-laden air is moved upward to the filter where the air flow begins its cycle all over again, as opposed to the conventional method of the prior art, where the air flow is expelled into the atmosphere without further use, with the disadvantage of expelling and depositing fine dust and possible bacteria everywhere, the amount depending on the efficiency of the filter being used. Yet another important advantage of the system of the present invention is the elimination of the necessary dusting afterward, and most important, in areas such as hospitals and convalescent homes, where the dust and bacteria factor is of extreme importance, is to provide a germ and bacterial killing system where germicidal and bacterial compounds can be used in a continuous closed loop manner, without blowing the germs and bacterial into the atmosphere as with conventional prior art vacuum cleaners or specialized units with costly sub-micron hospital grade (HEPA) filters which greatly obstruct the airflow and the efficiency of the vacuum motors and in turn the efficiency of the cleaning process. An additional benefit is the extensive vacuum motor noise reduction due to the recycled air flow system. The air fan noise is much more contained and diffused during the internal air flow rerouting process, and is much less noisy that conventional prior art units. The present novel system also affords greatly improved art in the application of air driven motors for the specific use of vacuum cleaning units through unique placement of the air-driven motor in the multi-purpose air flow work system. The present invention provides for the efficient use of the multi-purpose air flow work system, in that it can re-use the "clean" air from the filter to perform other useful work functions in a continuous manner, instead of being discharged into the atmosphere, as with conventional vacuum cleaning units. These work functions include, but are not limited to, the following: 1. Driving an air-driven motor in a greatly improved method, as described in greater detail hereinbelow. 2. Driving a venturi and pressurizing the liquid dispensing chamber in a highly efficient manner, as described in detail hereinbelow. 3. Greatly improved agitation and cleaning action, as described hereinbelow. The configuration of this air flow work system may include one or more rotary or oscillating power-driven brush assemblies to aid in the loosening and removal of dirt and foreign matter. These brush assemblies may be driven by electrical means, or may be driven by an air-driven motor. In the case of utilizing an air-driven motor to power a brush assembly in a vacuum cleaner, the design feature is to provide a clean air flow to the brush turbine motor. This is accomplished according to my invention by using the vacuum motor air flow after it has passed through the filter. This clean filtered air is then routed to efficiently drive the brush turbine motor in a continuous manner. The vacuum cleaning apparatus of the present invention may include a venturi for the dispensing of cleaning solutions when it is in the wet working mode. The design feature of the venturi is that the venturi is positioned in the clean air return loop past the filter, and after the dirt-laden air and cleaning solution have been cleaned by the filtering system, thereby keeping the venturi from fouling or plugging up. The additional benefit is that the re-routed high velocity air flow over the venturi tube pulls a low volume of liquid which "atomizes" the liquid cleaning solution, which then is air-jetted to the surface to be cleaned as "wet air" instead of a stream of water. This eliminates the problem of over-wetting, as with conventional prior art carpet cleaning extraction units equipped with pumps and spray nozzles, with resulting long and bothersome drying time and the possibility of mildew and material rot. Still further, it simplifies and reduces the cost of moving liquid, as it does not require the use of a costly pump to accomplish this task. The configuration of this cleaning unit also includes a controlled release system to dispense the cleaning liquid at will, in a metered manner when it is in the wet floor or carpet cleaning mode. The filtered air return channel to the work head includes part of the liquid dispensing valve, in that it closes the clean liquid chamber while it opens a side passage to the main return air flow channel, and thereby pressurizes the chamber containing the cleaning liquid, while at the same time opening the valve to the venturi. The liquid dispensing chamber pressurization efficiently assists the venturi in dispensing the cleaning solution. The configuration of this cleaning unit with the multi-purpose air flow work system design can include an air pressure and flow regulator valve, in case of a major momentary air flow restriction in the unit uplink suction part of the air flow system. The valve is placed past the filter unit, and just before the vacuum motor or motors, to eliminate possible airflow/starvation and to insure the delivery of air flow and pressure requirements to the air-driven brush motor, which insures, in turn, the delivery of the correct motor power level to drive the brush assembly at the proper speed. The configuration of the cleaning unit multi-purpose air flow work system includes a special work head which functions with the air flow system in the following special manner: With the single brush configuration, the air and dirt is sucked up into the brush assembly opening, and up and through the filter assembly. The filtered clean air is then returned to the work head where it may drive an air-driven motor which powers the work head brush assembly. The air is then routed through elongated narrow openings in the front and back of the brush assembly opening, where the high velocity air flow is then used in aiding the cleaning cycle by air jetting and loosening and moving dirt and foreign matter in the direction of the agitating brush, suction and uptake opening, which in turn moves the delivered air and dirt again upward through the filter, where the air flow begins to cycle all over again in a continuous manner, where the novel combination of the simultaneous air jetting, brush agitation and air suction is providing a much superior combined agitation and cleaning action than is provided in prior art conventional units. In addition, the air jet flow is controlled by valving to jet out only in the direction that the work head moves. As an example: When the work head is pushed forward, the air flow will only jet out of the front opening with the back opening being closed, and with the work head traveling toward the air flow with the air flow always pointed toward the approaching agitating brush and vacuum opening, where the air jet and brush agitation work together in an efficient manner. When the work head is pulled backward, the automatic air flow valve reverses the process by which it closes the front air jet opening, and simultaneously opens the back air jet opening with the air flow again pointed toward the approaching brush and vacuum opening. The added feature of the work head is that the air flow is contained within the workhead with a special peripheral air dam, and the air flow containment is accomplished quite easily with this air dam, since the air flow static pressure within this air dam is at zero (0) due to the air flow quantitative equilibrium at this point, i.e., there is as much air flow coming as going. The work head in the hard floor wet cleaning mode can be provided simply with the addition of a clip-on scrubbing pad and the lowering of a self adjusting or adjustable brush assembly (by electrical or manual means), to the hard floor scrubbing position. The unique and greatly improved art of hard floor cleaning is accomplished with the combined effort of: a) cleaning pad scrubbing; b) heavy brush scrubbing; c) air jet agitation; d) pressurized and atomized depositions of cleaning solutions; and e) removal of soiled solution by vacuum method. Providing a new and greatly improved wet carpet extraction method for wet carpet extraction machines (with or without motor-powered agitation brush assembly). a) Having an extraction work head, a large and centrally located vacuum uptake opening with air/water jet openings in front and back of the brush assembly and vacuum uptake opening, allowing the extraction workhead to properly function in both directions, forward and backward strokes. b) Having an extraction workhead with a large centrally located vacuum uptake opening, allowing it to pass large dirt and debris particles, such as cigarette butts, toothpicks, paperclips, and the like. The prior art conventional wet carpet extraction machines (with or without powered agitation brush assembly), are outfitted with narrow suction openings, specifically designed to move air and cleaning solutions laden with fine dirt only in a high-velocity manner, and are not designed to handle dirt and debris such as cigarette butts, toothpicks, paperclips, et cetera. In addition, these units are designed to move and clean in one direction only, mostly in a pulling movement, since the agitation brush and the cleaning solution spray jets are all mounted behind the narrow vacuum uptake opening, and therefore, the unit will not properly function in a forward movement. It obviously would leave behind all of the deposited cleaning solutions with the loosened dirt. The hereinafter described preferred embodiments of the present invention provide a novel vacuum cleaning system which is adapted to operate in a wet and/or dry mode. They also provide a novel vacuum cleaning system wherein the dirt and other foreign matter sucked up, is filtered, and the cleaned filtered air is routed or recycled to perform other work functions and in which a closed loop system exists wherein air and, if used, fluid, are continuously used, filtered and recycled. The embodiments can thus provide a germ and bacteria killing system for hospitals, convalescent homes and the like, where germicidal and bacterial killing compound can be used in a continuous closed loop manner without blowing the germs and bacteria into the atmosphere. In the illustrated embodiments there is provided a means for driving the brushes in the head assembly which includes a turbine motor driven by clean filtered air from the exhaust of at least one vacuum motor whereby no solid objects or material can clog or stall the turbine motor. In the illustrated embodiments, dirt and other material to be removed from the dirty surface being vacuumed is agitated by the introduction of pressurized air, optionally containing atomized liquid, into the head assembly. Embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which: Figure 1 is a front plan view, partially broken away, of the preferred embodiment of a self-contained upright floor model vacuum cleaner containing the novel system of this invention. Figure 2 is a side view of the device of Figure 1. Figure 3 is a rear view of the device of Figure 1. Figure 4 shows the device of Figure 1 with the hand piece shown, in broken lines, rotated 90° to the horizontal position for use under furniture, beds and the like. Figure 5 is a top plan view, in partial breakaway, of the lower or head assembly portion of the device of Figures 1 to 4. Figure 6 is a sectional view taken along line 6-6 in Figure 5. Figure 7 is a sectional view taken along line 7-7 in Figure 5. Figure 8 is a schematic view showing the essential functional features of the present invention which can be present in the device pictured in Figures 1 to 7. Figure 9A shows in more detail a wet filter, in sectional view, used in the wet mode operation of the system of this invention depicted schematically in Figure 8. Figure 9B shows the filter of Figure 9A in conjunction with a filter housing, baffle and water chamber seal. Figure 9C shows the arrangement of Figure 9B with the unit housing lid in place and further showing the vacuum line and the dirty air and atomized liquid filtering cycle and clean air return. Figure 10A shows in section view, a dry filter which is usable in the device of Figures 1 to 7. Figure 10B shows the filter of Figure 10A in conjunction with the filter unit housing, lid, vacuum line and dirty air filtering cycle and clean air return. Figure 11 shows a side view of the head assembly in schematic form and showing the air dams at the periphery of the head assembly to provide a closed loop airflow at the head assembly. Figure 12 is a schematic view of the head assembly provided with dual brushes for cleaning rugs in accordance with an alternative preferred embodiment of my invention. Figure 13 is similar to Figure 12 and shows the dual brush assembly in the wet mode of operation with scrub pads attached for cleaning hard surfaces. Turning to the drawings in greater detail, the upright portion 10 is provided with handle 12, control panel 14 with switches 16 and 18 for operating the vacuum motor 20 and floor light (not shown) which is positioned behind lens 22, respectively. The button 24 on handle 12 controls the dispensing of liquid. The top of upright portion 10 has a hinged lid 26. The lower or head assembly 28, carries the vacuum motor 20 having suction side 30 and air exhaust side 32. The suction side 30 pulls the dirty air upwardly in uptake line 34 and through the filter assembly 36. The air exhaust side 32 communicates with filtered air flow down line 38. The filtered air flow drives the turbine blade assembly 40 of the air turbine motor 42. The turbine blade assembly 40 is carried by shaft 44. The shaft 44 has a pulley 46. The brush 48 also has a pulley 50. These pulleys are connected by belt 52 so that the turbine motor 42 rotatably drives the brush 48. Note that the uptake line, 34 is centrally located over brush 48 within head assembly 28, so that it can suck up large objects which can enter head assembly through the very large floor-side opening. The air flow, after passing turbine blade assembly 40, is then injected into the interior of head assembly 28 at either or both air injection slots 54 and 56. If the air jet flow valve 58 is "up" (shown in dotted lines in Figure 6), all of the air is injected via slot 54. If the valve 58 is "down" (shown in solid lines in Figure 6), the air is injected via slot 56. The valve position can be automatically alternated so that air injection is always at a point ahead of the brush 48. Using Figure 6 as an illustration, when the unit is pulled forward by the operation (to the left), air is introduced at slot 56. When the unit is pulled back by the operator, the air is introduced at slot 54. Thus, this structure provides for the injection of clean air (including atomized water in the wet mode) ahead of the brush when the cleaning unit as a whole is either pushed forward or backward. The central location of uptake 34 over the brush 48 also serves to permit back and forth operation. The interior of housing 60 communicates with line 34 to take up dirty air. The elements 62 and 64 at the periphery are adapted to abut the surface being cleaned to create an air dam. In the case of a rug, the elements 62 and 64 slightly depress the nap of the rug to help make the air dam. The injection of air into head assembly 28 is balanced by the withdrawal of air toward the center via line 34 so that there is a pressure equilibrium at the peripheral air dam. To this point, the description of the drawings has focussed on the dry mode of operation. Turning to the wet mode, the filter assembly 36, which is of an air permeable material, is surrounded by removable filter housing 66. In Figure 4, the filter housing is the inside walls of the upper portion 10. The bottom portion 68 of the filter assembly 36 is separate, as shown in Figures 4 and 9. The filter assembly 36 is specifically designed to allow wet air filtering at high velocity with minimum airflow restriction and to separate air and liquids. The bottom portion 68 of the filter assembly 36 is specifically designed to perform the fine and precise filtering of the liquids (cleaning solutions) at low flow levels. These multiple stage filters may be construction as single or separate units. The filter assembly 36, removable filter housing 66 and bottom portion 68 are received in housing unit 70 provided with the hinged lid 26. Metal or plastic baffles 72 and seals 74 prevent the filtered liquid 76 from sloshing upwardly onto the filters. The filtered liquid 76 then passes to reservoir 78 via line 80. Reservoir 78 has a liquid fill cap 82. The filtered liquid flow in line 80 is adjustable by valve 84. The reservoir 78 is pressurized by pressurized air in line 86, the pressure in reservoir 78 being regulated by one way air valve 88. In addition, the baffles 72, seals 74 and valve 84 serve to prevent backflow of filtered liquid 76 into filter assembly 36 and beyond, particularly when upper portion 10 is at or near the horizontal position shown in dotted lines in Figure 4. The venturi 90 functions like a carburetor to produce atomized cleaning liquid into the filtered air flow injected into head assembly 28 at slots 54 and 56. The dirty liquid is picked up via line 34 and returned to filter 36 where more complete condensation of the liquid takes place as shown. The flow of liquid venturi 90 via line 92 is regulated by valve 94 is operated by button 24. It is to be understood that the cleaning liquid may contain detergents, germicides and disinfectants. The effect of bactericides is not only to sterilize the liquid, but also to scrub the air within the system of bacteria in a continuous closed loop manner, making this invention of special use in hospital and similar settings where patient exposure to bacterial contamination has been a serious chronic problem. The filter 36 is of a drop-in or cartridge type which is easily replaced by lifting the lid portion 26. The unit of this invention is provided with wheels 96 at either side at the rear of the lower head assembly 28. By tipping the unit back toward the operator, it is possible for the operator to wheel the unit to any desired location for use. As shown in Figure 4, the upright portion 10 can be moved or rotated from the vertical to the horizontal or any intermediate position to facilitate use of the unit in cleaning under furniture and other constricted and tight spaces. It should be noted that since the liquid is carried in reservoir 78 attached to lower head assembly 28, the device has a low center of gravity and has no tendency to fall or tip over when stored or left unattended. The operation of the device can be further described by reference to the schematic drawing of Figure 8 to which we now turn. The rotating brush 102 is contained within housing 104. The airflow slots 106 and 108 are at opposite sides to provide for forward and backward operation as previously described. Valve 110 regulates the airflow between slots 106 and 108. The air dams are indicated at 112. The turbine motor 114 drives brush 102 via drive belt 116. The vacuum motor 118 exhausts pressurized air through line 120 which drives turbine motor 114. The dirty air is sucked out through line 122 to filter assembly housing 124. The filtered liquid 126 passes to reservoir 128 which is pressurized by air from line 130, controlled by one way air valve 132. The filtered liquid passes via line 134 to venturi 136 regulated by valve 138. The pressure and air flow regulator valve 140 momentarily opens to admit outside air in the event there is air starvation to the vacuum motor 118 due either to an obstruction or the unit has been allowed to become overfilled with dirt. By the automatic opening of valve 140, air continues to be supplied to vacuum motor 118 and the exhaust air continues to drive the air turbine motor 114 which, in turn, continues to drive the brush 102. The operation of this invention affords significant advantages as will be appreciated by those skilled in the art. The air flow is a closed system with continuous recycling made possible by filtering, the air dams and the injection of air from the vacuum motor. In this invention there is no air discharge or air exhaust external to the unit to stir up dirt, bacterial, and the like. This avoidance of any disturbance of the environment around the unit is a notable feature. It is also important to note that the clean air and, if present, cleaning fluid is injected ahead of the brushes to help lift and remove the dirt and other material to be vacuumed away. This mode of operation substantially increases the efficiency of the unit over what is obtainable using the normal rotating brush device. Further, the unit cleans the rug or other surface when pushed either forward or backward. As shown in Figures 12 and 13, the unit may have dual or tandem brushes. In Figure 12, filtered air is introduced via line 202 between brushes 204 and 206. The elements 208 and 210 act as peripheral air dams and function as previously described with reference to the single brush unit. The dirty air is drawn up via line 212. The scrub pads 214 and 216 clip onto the bottom of the unit and abut the surface being cleaned to help loosen adhered materials present on a hard surface. The overall configuration of the vacuum unit of this invention may be, but is not limited to, the following: For home use, the configuration may be a trailing canister-type unit with hoses and wand, or in a single push-and-pull upright unit configuration, or it may be in a portable hand-held or body mounted and carried configuration. For industrial use, it may be as in the above-described configuration, and in addition, for large capacity units, it may be truck, car or cart mounted, to facilitate cleaning large industrial areas. The novel configuration of the filtering system provides various filtering capabilities in the same outer container. The dry filtering mode utilizes a dry disposable or permanent filter, which may be constructed of various materials to provide a variety of filtering levels, and is installed directly into the outer housing. The wet filtering mode utilizes a removable inner housing containing the filter units. This inner housing is then inserted into the same outer housing as in the dry configuration. The inner housing is novel, in that it provides the following functions: 1. Containing the special high velocity air filtering and water separation unit. 2. Containing the special water filter with highly efficient filtering capabilities at low liquid flow levels. 3. Handling air, dirt, and water separation at high airflow velocities, and liquid filtering at low flow levels, within the same outer housing, without detrimental effect to each other. 4. Creating separate cavities within the outer housing to handle the high velocity air filtering and water separation in one cavity, and the highly efficient water filtering at low flow levels in another cavity. 5. Creating a separate cavity within the outer housing to collect the clean filtered solution for reuse and dispensing. 6. Removability of the inner filter housing and ease of servicing inner filter housing external to the outer housing. 7. Removability of inner housing and ease of servicing outer housing when inner housing is removed. 8. Controlled wall separation of the inner and outer housing, providing greater air flow through and around the filter unit, resulting in greatly improved filter efficiency. Accessories for this cleaning unit will depend on each unit's final configuration as described in detail in this document. All configurations will have the proper provisions to install and use the accessories designed to serve the individual unit configuration. The accessories include, but are not limited to, the following: FOR WET APPLICATIONS: 1. upholstery tool; 2. blow tool (for cleaning stopped-up sinks, et cetera); 3. suction tool (for cleaning stopped-up sinks and toilets); 4. hand-held cleaning unit (which may or may not be motorized). (For general use in odd places.) FOR DRY APPLICATIONS: 1. crevice tool; 2. curtain brush tool; 3. window-blind brush tool; 4. brush tool (general use); 5. hand-held cleaning unit (which may or may not be motorized). (For general use in odd places.) In larger units, two brushes can be provided within the head assembly with the dual brush configuration. The air jet release system is placed in the center of the dual brush configuration with brush assemblies and vacuum openings on each side of the air jet release system, which eliminates the need for an air flow valving system as described and needed in the single brush assembly design. The air flow from the now centrally-located air jet release system is captured traveling in either direction automatically. Having fully described the invention, it is intended that it be limited solely by the lawful scope of the appended claims.

Claims: Cleaning apparatus, for cleaning rugs, floors or other surfaces, the apparatus comprising: a) a vacuum source (20, 118) having a suction side (30) and a controlled air flow pressure side (exhaust side (32)); b) a pair of spaced apart wheels (96) positioned at the rear of the apparatus and adapted to ride on the rug, floor or other surface to be cleaned; c) a head assembly (28) positioned forwardly of said pair of spaced apart wheels (96) and adapted to ride on the surface to be cleaned; d) at least one rotatable brush (48, 102, 204, 206) within said head assembly (28); e) means (34, 122) communicating the suction side (30) of the vacuum source (20, 118) with the head assembly (28); f) a turbine motor (42, 114); g) means (38, 120) communicating the air exhaust side (32) of the vacuum source (20, 118) with the head assembly (28), said turbine motor (42, 114) being positioned within such air exhaust communicating means (38, 120) whereby the air exhaust will impinge on and drive the turbine motor; and h) means (46, 50, 52, 116) interconnecting said at least one brush (48, 102, 204, 206) and the turbine motor (42, 114) whereby the turbine motor drives said at least one brush, said means interconnecting being at a right angle to the axis of rotation of the brush; characterised in that: the cleaning apparatus is a vacuum cleaning apparatus having a closed air flow loop; the head assembly (28) is arranged to form the closed air flow loop and is associated with peripheral air containment means (62, 64, 112, 208, 210) for preventing air from entering or leaving around the periphery of the head assembly (28) when it rides on the surface to be cleaned; and the means (34, 122) communicating the suction side (30) of the vacuum source (20, 118) with the head assembly (28) is arranged to provide suction within the head assembly for picking up dirt or other materials. Apparatus according to claim 1, wherein the exhaust air communicating means (38, 120) is arranged to inject air into the head assembly (28) and onto the surface to be cleaned to agitate dirt and facilitate dirt removal. Apparatus according to claim 1 or 2, wherein air filter means (36) is positioned between the suction side (30) of said vacuum source (20, 118) and the head assembly (28) to remove dirt and other solid, liquid or other particulate material in a closed loop manner from air passing from the head assembly to the suction side of the vacuum source. Apparatus according to claim 1, 2 or 3, wherein there is additionally provided a source (78, 128) to contain cleaning liquid (126) and means (90, 134, 136, 138) for the injection of atomised liquid from said source into the head assembly. Apparatus according to claim 4, wherein the means for the injection of atomised liquid (126) includes a venturi (90, 136). Apparatus according to claim 4 or 5, wherein the cleaning liquid (126) contains germicidal and/or bacteria killing compounds for removal of germs and bacteria from the surfaces to be cleaned and the apparatus is arranged to continuously scrub the liquid and air within the apparatus in a closed loop manner. Apparatus according to claim 4, 5 or 6, wherein means (68) are provided for filtering a condensate formed by removal of dirty atomised liquid by air filter means positioned between the vacuum source (20, 118) and the head assembly (28); means (80, 134) being included for communicating said filtered clean condensate with said means (90, 136) for injecting atomised liquid. Apparatus according to claim 7, wherein the apparatus is a self-contained, upright vacuum cleaner comprising an upright portion (10), wherein said head assembly portion (28) contains said vacuum source (20, 118) and said upright portion includes said cleaning liquid source (78, 128), said upright portion being rotatable from a vertical position to a horizontal position for use in vacuuming under furniture and the like, said upright portion containing means (72, 74, 84) to prevent backflow of cleaning liquid into said air filter means when said upright portion is in the horizontal position. Apparatus according to any preceding claim, wherein a plurality of said brushes (48, 102, 204, 206) are provided within the head assembly (28). Apparatus according to any preceding claim, wherein further air directing means (54, 56, 58, 106, 108, 110) are provided within the head assembly (28) for forcing the air through the tufts of a rug being cleaned in use of the apparatus. Apparatus according to any preceding claim, wherein said means interconnecting the brush or brushes (48, 102, 204, 206) and the turbine motor includes pulleys (46, 50) and a drive belt (52, 116). Apparatus according to any preceding claim, wherein the means (38, 120) for communicating the exhaust side (32) of the vacuum source with the head assembly (28) to inject air into the head assembly is so positioned as to alternately inject the air ahead of the brush or brushes (48, 102, 204, 206) in both directions. Apparatus according to any preceding claim, wherein the means (34, 122) for communicating the suction side (30) of the vacuum source (20, 118) with the head assembly (28) to provide suction within the head assembly for picking up dirt and other material is so positioned that suction is available over the brush or brushes (48, 102, 204, 206) in both wet and dry modes. Apparatus according to any preceding claim, wherein the air containment means includes air dams (62, 64, 112, 208, 210) provided around the periphery of the head assembly (28). Apparatus according to any preceding claim, wherein said means for interconnecting the brush or brushes (48, 102, 204, 206) and the turbine motor (42, 114) is at one end of the brush or brushes. Apparatus as claimed in any of the preceding claims, wherein a plurality of motors are provided. Apparatus as claimed in any of claims 1 to 11, wherein the apparatus comprises means (58, 110) for alternately injecting air at opposite sides of the brush or brushes (48, 102, 204, 206) whereby the apparatus is arranged to clean when the apparatus is moved in both forward and reverse directions.

Inventors: WILLIAMS WILLIAM HENDRICK, WILLIAMS, WILLIAM HENDRICK
Applicants: WILLIAMS WILLIAM HENDRICK, WILLIAMS, WILLIAM HENDRICK
Application year: 1990
Main classification: A47L7
IPC codes: A47L5, A47L9, A47L7