Patent Publication Number: US-9402523-B2

Title: Rotary surface cleaning tool

Description:
FIELD OF THE INVENTION 
     The present invention relates generally to a rotary tool for cleaning surfaces, including rugs and carpets, and in particular to such apparatus and methods with brushes for coaction with cleaning liquid delivering means and suction extraction means. 
     BACKGROUND OF THE INVENTION 
     Many apparatuses and methods are known for cleaning carpeting and other flooring, wall and upholstery surfaces. The cleaning apparatuses and methods most commonly used today apply cleaning fluid as a spray under pressure to the surface whereupon the cleaning fluid dissolves the dirt and stains and the apparatus scrubs the fibers while simultaneously applying suction to extract the cleaning fluid and the dissolved soil. Many different apparatuses and methods for spraying cleaning fluid under pressure and then removing it with suction are illustrated in the prior art. Some of these cleaning apparatuses and methods use a rotating device wherein the entire machine is transported over the carpeting while a cleaning head is rotated about a vertical axis. 
     Another category of carpeting and upholstery cleaning apparatuses and methods using the rotating device wherein the entire machine is transported over the carpeting while a cleaning head is rotated about a vertical axis includes machines having a plurality of arms, each of having one or more spray nozzles or a suction means coupled to a vacuum source. These rotary cleaning tools providing a more intense scrubbing action since, in general, more scrubbing surfaces contact the carpet. These apparatuses and methods are primarily illustrated in U.S. Pat. No. 4,441,229 granted to Monson on Apr. 10, 1984, and are listed in the prior art known to the inventor but not discussed in detail herein. 
     A third category of carpeting and upholstery cleaning apparatuses and methods that attempt to deflect or otherwise control the cleaning fluid are illustrated by U.S. Pat. No. 6,243,914, which was granted to the inventor of the present patent application Jun. 12, 2001, and which is incorporated herein by reference. U.S. Pat. No. 6,243,914 discloses a cleaning head for carpets, walls or upholstery, having a rigid open-bottomed main body that defines a surface subjected to the cleaning process. Mounted within or adjacent to the main body and coplanar with the bottom thereof is a fluid-applying device which includes a slot at an acute angle to the plane of the bottom of the body located adjacent the plane of the bottom of the body, the slot configured such that the fluid is applied in a thin sheet that flows out of the slot and into the upper portion of the surface to be cleaned and is subsequently extracted by suction into the vacuum source for recovery. The cleaning head is alternatively multiply embodied in a plurality of arms which are rotated about a hub. 
       FIG. 1  illustrates a typical prior art professional fluid cleaning system as illustrated in U.S. Pat. No. 6,243,914. It is to be understood that this cleaning system is typically mounted in a van or truck for mobile servicing of carpets and flooring in homes and businesses. The typical truck-mounted fluid cleaning system  1  includes a main liquid waste receptacle  3  into which soiled cleaning fluid is routed. A cleaning head or nozzle  5  is mounted on a rigid vacuum wand  7  which includes a handle  8  for controlling cleaning head  5 . A supply of pressurized hot liquid solution of cleaning fluid is supplied to cleaning head  5  via a cleaning solution delivery tube  9  arranged in fluid communication with a cleaning solution inlet orifice  11  of cleaning head  5  for delivering there through a flow of pressurized liquid cleaning solution to fluid cleaning solution spray jets  13  of cleaning head  5 . Carpet cleaning head  5  typically includes a rectangular, downwardly open truncated pyramidal envelope  15  which contains the cleaning fluid spray that is applied to the carpet or other flooring, as well as forming a vacuum plenum for the vacuum retrieving the soiled liquid for transport to waste receptacle  3 . An intake port  16  of the vacuum wand  7  is coupled in fluid communication with the vacuum plenum of cleaning head  5 . 
     Mounted above the main waste receptacle  3  is a cabinet  17  housing a vacuum source and supply of pressurized hot liquid cleaning fluid. Soiled cleaning fluid is routed from cleaning head  5  into waste receptacle  3  via rigid vacuum wand  7  and a flexible vacuum return hose  19  coupled in fluid communication with an exhaust port  20  thereof, whereby spent cleaning solution and dissolved soil are withdrawn under a vacuum force supplied by the fluid cleaning system, as is well known in the art. A vacuum control valve or switch  21  is provided for controlling the vacuum source. 
       FIG. 2  illustrates details of operation of the typical truck-mounted fluid cleaning system  1  illustrated in  FIG. 1 . Here, the main waste receptacle  3 , as well as the vacuum source and cleaning fluid supply cabinet  17 , are shown in partial cut-away views for exposing details thereof. The cleaning fluid is drawn through cleaning solution delivery tube  9  from a supply  23  of liquid cleaning solution in the cabinet  17 . The vacuum for vacuum return hose  19  is provided by a vacuum suction source  25 , such as a high pressure blower, driven by a power supply  27 . The blower vacuum source  25  communicates with the main waste receptacle  3  through an air intake  29  coupled into an upper portion  31  thereof and, when operating, develops a powerful vacuum in an air chamber  33  enclosed in the receptacle  3 . 
     Vacuum return hose  19  is coupled in communication with waste receptacle  3  through a drain  35 , for example, at upper portion  31 , remote from intake  29 . Vacuum return hose  19  feeds soiled cleaning fluid into waste receptacle  3  as a flow  37  of liquid soiled with dissolved dust, dirt and stains, as well as undissolved particulate material picked up by the vacuum return but of a size or nature as to be undissolvable in the liquid cleaning fluid. The flow  37  of soiled cleaning fluid enters into waste receptacle  3  through drain  35  and forms a pool  39  of soiled liquid filled with dissolved and undissolved debris. A float switch  41  or other means avoids overfilling the waste receptacle  3  and inundating the blower  25  through its air intake  29 . A screen or simple filter may be applied to remove gross contaminates from the soiled liquid flow  37  before it reaches the pool  39 , but this is a matter of operator choice since any impediment to the flow  37  reduces crucial vacuum pressure at the cleaning head  5  for retrieving the soiled liquid from the cleaned carpet or other surface. 
     Soiled liquid cleaning fluid effectively filters air drawn into the waste receptacle  3  by dissolving the majority of dust, dirt and stains, and drowning and sinking any undissolved debris whereby it is sunk into the pool  39  of soiled liquid and captured therein. Thus, the soiled liquid in the vacuum return hose  19  effectively filters the air before it is discharged into the enclosed air chamber  34 , and no airborne particles of dust and dirt are available to escape into the enclosed air chamber  33  floating above the liquid pool  39 . 
     In a rotary surface cleaning tool, cleaning head  5  utilizes cleaning liquid delivering means and suction extraction means in combination with a rotary cleaning plate that is coupled for high speed rotary motion. 
     One example of a rotary surface cleaning tool is illustrated by U.S. Pat. No. 4,182,001, SURFACE CLEANING AND RINSING DEVICE, issued to Helmuth W. Krause on Jan. 8, 1980, which is incorporated herein by reference. 
       FIG. 3  illustrates the rotary surface cleaning and rinsing machine of Krause, indicated generally at  50 , which includes a substantially circular housing  51  and frame  53  with its lower axial face open at  55 , with this face  55  being disposed substantially parallel to the surface which is to be cleaned, such as a rug  57 . Mounted on top of the housing  51  and frame  53  is an enclosure  59  from which extends a handle assembly  61 . Handle assembly  61  is held by the operator during the manipulation of machine  50 . Handle assembly  61  has operating levers  63  and  65 . Control handle  65  regulates flow of cleaning or rinsing fluid to rotary surface cleaning tool  51  through feed line  67 . For example, feed line  67  is coupled to cleaning solution delivery tube  9  from supply  23  of liquid cleaning solution in cabinet  17  in a truck-mounted unit, or another supply of liquid cleaning solution. Control handle  63  can be used to regulate the starting and stopping of drive motors. 
     An exhaust pipe or tube  69  is mounted on handle assembly  61  and is connected to the top of rotary surface cleaning tool  51  at a connection  71 . Suction is created by the motor and fan assembly  73 . Else, exhaust pipe or tube  69  is coupled for suction extraction to vacuum return hose  19  and vacuum source  25  in a truck-mounted unit. Soiled cleaning fluid extracted by suction extraction from carpet or rug  57  is drawn off through outlet connection  71  and through discharge hose  69 . Frame  53  may also be supported by a swivel wheel  75 . A large rotor  77  is rotationally mounted within housing  51  and rotationally coupled within enclosure  59 . Rotor  77  is drivingly connected by a drive belt or chain  79  to an output shaft  81  of an electric motor  83  mounted on the frame  53 . Motor  83  serves to turn large rotor  77 . A plurality of circular brushes  85  are located on rotor  77 . 
       FIG. 4  illustrates brushes  85  are rotated as shown by arrows  87  in the opposite direction from the turning motion  89  of the rotor  77  by a rotating drive means for contrarotating brushes  85  with respect to rotor  77 . Moreover, brushes  85  are rotated at significantly higher revolutions per minute (RPM) than rotor  77  for producing a very vigorous brush scrubbing action. For example, brushes  85  rotate more than seven times with respect to rug  57  for each full rotation of rotor  77 . As a result, the brush elements or bristles in the peripheral region travelling very rapidly in a backward direction  87  relative to rotor  77  tend to lift up and to flip over the matted pile of rug  57  thereby exposing and scrubbing its underside. Then, in interior regions  91  where brush elements or bristles are travelling in the same direction as rotor  77 , they flip the pile back into its original position for scrubbing it on the other side. Thus, the pile of rug  57  becomes thoroughly scrubbed on its underside as well as on its upper side. A cyclic scrubbing action is produced flipping the matted pile back and forth many times during one pass of machine  50 . 
     Also positioned on rotor  77  are suction extraction nozzles  93  spaced between brushes  85  and communicating with discharge hose  69 . Suction extraction nozzles  93  are fixed to rotor  77  and each is provided with a relatively narrow vacuum extraction slot  95 . Each vacuum extraction slot  95  is positioned coplanar with the ends of the brush elements or bristles of brushes  85  distal from rotor  77 . 
     Also mounted on rotor  77  is a plurality of spray nozzle means  97  for dispensing cleaning or rinsing liquid. Each of spray nozzle means  97  can be mounted for angular adjustment so as to direct sprays of cleaning or rinsing liquid through individual nozzles  99  onto rug  57  at different angles. The cleaning or rinsing fluid is conveyed to nozzle means  97  through line  67  which leads to a supply of cleaning or rinsing fluid, such as either feed line  67  or solution delivery tube  9 . 
     During operation of the cleaning device, rotor  77  rotates in the direction indicated by arrow  89 . As the cleaning liquid is sprayed onto rug  57  through nozzles  99 , rotating brushes  85  agitate the pile of rug  57  in conjunction with the cleaning liquid to loosen dirt in or on the surface. The spent cleaning liquid and loosened dirt are extracted up by the next succeeding suction extraction nozzle  93 . Accordingly, the liquid-dwell-time is solely controlled by machine  50 , and not by the rate at which the operator advances machine  50  over the floor. 
     However, known rotary surface cleaning tool are limited in their ability to effectively provide the desired cleaning of target floor surfaces and extraction of soiled cleaning liquid. 
     SUMMARY OF THE INVENTION 
     The present invention is a rotary surface cleaning machine for cleaning floors, including both carpeted floors and uncarpeted hard floor surfaces including but not limited to wood, tile, linoleum and natural stone flooring. The rotary surface cleaning machine has a rotary surface cleaning tool mounted on a frame and coupled for high speed rotary motion relative to the frame. The rotary surface cleaning tool has a substantially circular operational surface that performs the cleaning operation. The rotary surface cleaning tool is driven by an on-board power plant to rotate at a high rate. The rotary surface cleaning tool is coupled to a supply of pressurized hot liquid solution of cleaning fluid and a powerful vacuum suction source. 
     According to one aspect of the invention a plurality of individual arrays of cleaning solution delivery spray nozzles are substantially uniformly angularly distributed across the operational surface of the rotary surface cleaning tool, the arrays of spray nozzles being coupled in fluid communication with a pressurized flow of cleaning fluid through a plurality of individual liquid cleaning fluid distribution channels of a cleaning fluid distribution manifold portion of the rotary surface cleaning tool. Each of the plurality of individual arrays of cleaning solution delivery spray nozzles includes a plurality of individual delivery spray nozzles that are radially oriented across the substantially circular operational surface of the rotary surface cleaning tool, and each individual array of the spray nozzles extends across a portion of the operational surface that is substantially less than an annular portion thereof extended between an inner radial limit and an outer radial limit. Individual ones of the arrays of spray nozzles are positioned in a substantially spiral pattern across the annular portion of the operational surface of the rotary surface cleaning tool between the inner radial limit of the annular portion and receding therefrom over the annular portion toward the outer radial limit thereof. 
     This spiral pattern of individual array of spray nozzles greatly reduces the number of individual delivery spray nozzles that must be supplied on the operational surface of the rotary surface cleaning tool. However, the high speed of rotation ensures that sufficient quantities of cleaning solution is delivered since each individual array of spray nozzles is presented to the target floor area at least one, two or several times each second. The spray nozzles are very expensive to drill or otherwise form because they are only about 1/10,000th of an inch in diameter. Therefore, a large cost savings is gained, while the delivery of cleaning solution does not suffer. Forming the array of spray nozzles in the spiral pattern so that the individual array of spray nozzles to cover only a fractional portion of the operational surface of the rotary surface cleaning tool also ensures that the cleaning solution is delivered with substantially uniform pressure across the entire radius of the rotary surface cleaning tool, without resorting to special design features normally required in the prior art to provide uniform pressure across each spray nozzle array that extends across at least a large portion of radius of the rotary surface cleaning tool, or else the entire radius. 
     According to another aspect of the invention a plurality of suction extraction shoes are also substantially uniformly angularly distributed across the operational surface of the rotary surface cleaning tool alternately between the arrays of cleaning solution delivery spray nozzles and are projected from the operational surface of the rotary surface cleaning tool by a biasing means that is structured for individually biasing each suction extraction shoe outwardly relative to bottom operational surface of the rotary surface cleaning tool. For example, a resilient cushion, such as a closed foam rubber cushion of about one-quarter inch thickness or thereabout, is positioned between a flange portion of each shoe and the rotary surface cleaning tool. 
     Each of the suction extraction shoes is further formed with a fluid extraction passage presented in a position adjacent to the operational surface of the rotary surface cleaning tool. The fluid extraction passage of each suction extraction shoe communicates through one of a plurality of plenum branch passages within the rotary surface cleaning tool with a vacuum plenum that is in fluid communication with the vacuum suction source. 
     According to another aspect of the invention the rotary surface cleaning tool has a target surface scrubbing means for causing a washboard-type scrubbing effect of a moveable target surface to be cleaned, i.e., a carpet. The target surface scrubbing means causes oscillations of the moveable target surface alternately toward and away from the operational surface of the rotary surface cleaning tool by alternate application of vacuum suction pulling the carpet toward the operational surface of the rotary surface cleaning tool and application of compression by the next consecutive shoe pushing the carpet away from the operational surface of the rotary surface cleaning tool. 
     According to another aspect of the invention the target surface scrubbing means for causing a washboard-type scrubbing effect is one or both of (a) a relatively raised surface portion of each suction extraction shoe that projects further from the operational surface of the rotary surface cleaning tool than a relatively lower surface portion thereof, and (b) one or more rows of bristle brushes arranged along a surface portion of each suction extraction shoe and projected further from the operational surface of the rotary surface cleaning tool than a surface of the corresponding suction extraction shoe. The relatively raised surface portion of each suction extraction shoe, or the one or more rows of bristle brushes, whichever is present, the leading surface portion of the suction extraction shoe as a function of a direction of the rotary motion of the operational surface of the rotary surface cleaning tool, while the relatively lower surface or brushless portion forms the trailing surface portion of the suction extraction shoe. 
     When present, the rows of bristle brushes provide a more aggressive cleaning action in cleaning when provided in combination with fluid cleaning of carpet or other target flooring surface. Furthermore, when present the optional raised bristle brushes effectively raise bottom operational surface of the rotary surface cleaning tool slightly away from target floor surface so that the rotary surface cleaning machine can be alternated between carpeting and hard floor surfaces such as wood, tile, linoleum and natural stone flooring, without possibility of scarring or other damage to either the operational surface of the rotary surface cleaning tool or the hard floor surfaces. 
     Other aspects of the invention are detailed herein. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The foregoing aspects and many of the attendant advantages of this invention will become more readily appreciated as the same becomes better understood by reference to the following detailed description, when taken in conjunction with the accompanying drawings, wherein: 
         FIG. 1  illustrates a typical prior art professional fluid cleaning system of a type that is typically mounted in a van or truck for mobile servicing of carpets and flooring in homes and businesses; 
         FIG. 2  illustrates details of operation of the typical truck-mounted fluid cleaning system illustrated in  FIG. 1 ; 
         FIG. 3  illustrates one rotary surface cleaning and rinsing machine of the prior art; 
         FIG. 4  is another view of the rotary surface cleaning and rinsing machine of the prior art as illustrated in  FIG. 3 ; 
         FIG. 5  illustrates the rotary surface cleaning machine of the invention for delivery of liquid cleaning fluid to a target surface to be cleaned, such as either carpeting or hard floor surfaces including but not limited to wood, tile, linoleum and natural stone flooring; 
         FIG. 6  is a side view of the rotary surface cleaning machine illustrated in  FIG. 5 , wherein a plurality of suction extraction shoes are more clearly illustrated as being located on a rotary surface cleaning tool and projected from an open lower axial face of a circular housing; 
         FIG. 7  is a bottom view of the rotary surface cleaning machine illustrated in  FIG. 5  and  FIG. 6 , wherein the plurality of suction extraction shoes are more clearly illustrated as being located on the rotary surface cleaning tool in the open lower axial face of the circular housing; 
         FIG. 8  illustrates the rotary surface cleaning tool of the rotary surface cleaning machine illustrated in  FIG. 5  through  FIG. 7 , wherein the rotary surface cleaning tool is mounted on the support frame with an on-board power plant; 
         FIG. 9  is a partial cross-section view of the rotary surface cleaning machine illustrated in  FIG. 5  through  FIG. 8 , wherein the rotary surface cleaning tool is mounted on the support frame through a rotary coupling; 
         FIG. 10  illustrates the rotary surface cleaning tool of the rotary surface cleaning machine illustrated in  FIG. 5  through  FIG. 9 , wherein the rotary surface cleaning tool is drivingly connected, for example but without limitation, by a drive gear to the rotary drive output of the on-board power plant; 
         FIG. 11  illustrates an upper coupling surface of the rotary surface cleaning tool of the rotary surface cleaning machine illustrated in  FIG. 5  through  FIG. 9 , as further illustrated in  FIG. 10 ; 
         FIG. 12  illustrates a bottom operational surface of the rotary surface cleaning tool of the rotary surface cleaning machine illustrated in  FIG. 5  through  FIG. 9 , as further illustrated in  FIG. 10  and  FIG. 11 ; 
         FIG. 13  is a detail view of one embodiment of the suction extraction shoe of the rotary surface cleaning machine illustrated in  FIG. 5  through  FIG. 9 ; 
         FIG. 14  is a detailed cross-section view of one embodiment of the suction extraction shoe illustrated in  FIG. 13 , wherein the suction extraction shoe is shown as having a leading surface and a trailing surface as a function of the rotational direction of the rotary surface cleaning tool; 
         FIG. 15  illustrates the bottom operational surface of the rotary surface cleaning tool of the rotary surface cleaning machine illustrated in  FIG. 5  through  FIG. 9 , having the suction extraction shoe with an optional raised leading surface portion and a relatively lower trailing surface portion as illustrated in  FIG. 13  and  FIG. 14 ; 
         FIG. 16  illustrates bottom the operational surface of the rotary surface cleaning tool of the rotary surface cleaning machine illustrated in  FIG. 5  through  FIG. 9 , having a spiral pattern of cleaning solution delivery spray nozzle arrays of individual delivery holes, wherein each spray nozzle array consists of one to about four individual delivery holes, and wherein the individual spray nozzle arrays are positioned in a spiral pattern across the bottom operational surface of the rotary surface cleaning tool; 
         FIG. 17  is a detail view of another embodiment of the suction extraction shoe of the rotary surface cleaning machine illustrated in  FIG. 5  through  FIG. 9 , wherein the leading surface does not include the optional raised portion but is rather substantially coplanar with the trailing surface, but the leading surface rather includes one or more bristle brushes in one or more rows arranged along an outermost portion thereof; 
         FIG. 18  is a detailed cross-section view of the embodiment of the suction extraction shoe illustrated in  FIG. 17 ; 
         FIG. 19  illustrates the operational surface of the rotary surface cleaning tool of the rotary surface cleaning machine illustrated in  FIG. 5  through  FIG. 9 , wherein the suction extraction shoes are configured with substantially coplanar leading and trailing surfaces, and the shoe leading surfaces have one or more of the bristle brushes in one or more rows arranged along the outermost portions thereof; 
         FIG. 20  illustrates rotary surface cleaning tool of the rotary surface cleaning machine illustrated in  FIG. 5  through  FIG. 9 , wherein each suction extraction shoe is supported in the bottom operational surface by a biasing means structured for individually biasing or “floating” each suction extraction shoe outwardly relative to the bottom operational surface of the rotary surface cleaning tool; 
         FIG. 21  is a cross-section view of the rotary surface cleaning tool of the rotary surface cleaning machine illustrated in  FIG. 5  through  FIG. 9 , wherein the biasing means for individually biasing or “floating” each suction extraction shoe outwardly relative to the bottom operational surface of the rotary surface cleaning tool is structured, by example and without limitation, as a resilient cushion, such as a closed foam rubber cushion of about one-quarter inch thickness or thereabout, that is positioned between a flange portion of each shoe and the rotary surface cleaning tool; 
         FIG. 22  is a detail view of another embodiment of the suction extraction shoe of the rotary surface cleaning machine illustrated in  FIG. 5  through  FIG. 9 , wherein each suction extraction shoe is structured for accomplishing the “washboard” scrubbing effect of the moveable target surface, i.e. carpet surface, independently of the next consecutive suction extraction shoe; 
         FIG. 23  is a detailed cross-section view of the embodiment of the suction extraction shoe illustrated in  FIG. 22 , wherein the suction extraction shoe is shown as having the optional relatively lower or recessed portion formed on the leading surface and the relatively raised portion is formed on the trailing surface as a function of the reversed clockwise rotational direction of the rotary surface cleaning tool; and 
         FIG. 24  illustrates the bottom operational surface of the rotary surface cleaning tool of the rotary surface cleaning machine illustrated in  FIG. 5  through  FIG. 9 , having the suction extraction shoe formed with the optional relatively lower or recessed surface portion on its leading surface, and the optional relatively raised surface portion formed on the trailing surface as illustrated in  FIG. 22  and  FIG. 23 . 
     
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENT 
     In the Figures, like numerals indicate like elements. 
       FIG. 5  illustrates a rotary surface cleaning machine  100  of a type for delivery of liquid cleaning fluid to a target surface to be cleaned, such as either carpeting or hard floor surfaces including but not limited to wood, tile, linoleum and natural stone flooring. Rotary surface cleaning machine  100  is coupled to draw liquid cleaning fluid through cleaning solution delivery tube  9  from a supply  23  of liquid cleaning solution in the cabinet  17 . 
     Rotary surface cleaning machine  100  is optionally a stand-alone unit coupled to a supply of pressurized hot liquid solution of cleaning fluid and a having an on-board motor or other power plant coupled for driving a fan assembly for generating a suction as, for example, rotary tool for cleaning surfaces disclosed by U.S. Pat. No. 4,182,001, which is incorporated herein by reference. Alternatively, rotary surface cleaning machine  100  is part of a truck-mounted fluid cleaning system such as illustrated in  FIG. 1  and  FIG. 2  and disclosed in U.S. Pat. No. 6,243,914, which is incorporated herein by reference. When part of a truck-mounted fluid cleaning system, rotary surface cleaning machine  100  is coupled to vacuum return hose  19  and truck-mounted vacuum source  25  by means of an exhaust pipe or hose  102  coupled to an exhaust port  104 . Fluid extraction suction is generated by the vacuum force supplied by vacuum source  25 . Soiled cleaning fluid extracted from carpet or rug  57  is drawn off through exhaust port  104  and carried through flexible vacuum return hose  19  to main waste receptacle  3 . 
     As illustrated here by example and without limitation, rotary surface cleaning machine  100  includes a support frame member  106 , which may be supported by a wheel assembly  108 . Support frame  106  carries a substantially circular housing  110  having its lower axial face open at  112  with this face  112  being disposed substantially parallel to the surface which is to be cleaned, such as rug  57 . A pivotally mounted handle assembly  114  is used by the operator during operation for manipulating machine  100 . Handle assembly  114  supports one or more operating control mechanisms mounted thereon for the convenience of the operator. For example, one flow control mechanism  116  regulates flow of cleaning fluid through cleaning solution delivery tube  9 . A conventional quick connection can be used for supplying the liquid cleaning solution. Another vacuum control mechanism  118  can be used to regulate the suction extraction of spent cleaning liquid and loosened dirt. A rotary control mechanism  120  can be used to regulate the starting and stopping of the rotary surface cleaning tool through control of an on-board power plant  122 , such as an electric motor or other power plant, mounted on support frame  106 . 
     A rotary surface cleaning tool  124  is configured as a large rotor that is journaled with support frame  106  for high speed rotary motion within circular housing  110 . On-board power plant  122  is coupled for driving the high speed rotary motion of rotary surface cleaning tool  124 . 
     A plurality of suction extraction shoes  126  are located on rotary surface cleaning tool  124  and project from open lower axial face  112  of circular housing  110 . Each suction extraction shoe  126  is coupled in fluid communication with vacuum source  25  through exhaust port  104  and exhaust pipe or hose  102  for the suction extraction of spent cleaning liquid and loosened dirt. 
       FIG. 6  is a side view of the rotary surface cleaning machine  100  illustrated in  FIG. 5 , wherein the plurality of suction extraction shoes  126  are more clearly illustrated as being located on rotary surface cleaning tool  124  and projected from open lower axial face  112  of circular housing  110 . 
       FIG. 7  is a bottom view of the rotary surface cleaning machine  100  illustrated in  FIG. 5  and  FIG. 6 , wherein the plurality of suction extraction shoes  126  are more clearly illustrated as being located on rotary surface cleaning tool  124  in open lower axial face  112  of circular housing  110 . 
     As disclosed herein, a rotary drive output  128  of on-board power plant  122  is coupled for driving the high speed rotary motion of rotary surface cleaning tool  124 . For example, rotary surface cleaning tool  124  is rotationally mounted within housing  110  and is drivingly connected, for example but without limitation by any of: a drive belt, a drive chain, or a drive gear, to rotary drive output  128  of on-board power plant  122  mounted on frame  106 . Here, by example and without limitation, rotary drive output  128  of on-board power plant  122  is a drive gear coupled to drive a circumferential tooth gear  130  disposed about the circumference of rotary surface cleaning tool  124 . Accordingly, drive means alternative to the rotary gear drive disclosed herein by example and without limitation are also contemplated and may be substituted without deviating from the scope and intent of the present invention. Power plant  122  thus serves to turn rotary surface cleaning tool  124  at a high speed rotary motion under the control of rotary control mechanism  120 . 
     Rotary surface cleaning tool  124  includes a plurality of arrays  132  of cleaning solution delivery spray nozzles each coupled in fluid connection to the pressurized flow of cleaning fluid delivered through cleaning solution delivery tube  9 . Spray nozzle arrays  132  deliver pressurized hot liquid solution of cleaning fluid to target carpeting or hard floor surface. Spray nozzle arrays  132  are distributed on rotary surface cleaning tool  124  in groups positioned between the plurality of suction extraction shoes  126 . Accordingly, when rotary surface cleaning tool  124  turns at 150 RPM during operation, each spray nozzle array  132  delivers the pressurized hot liquid solution of cleaning fluid to the target floor surface at least one, two or more times each second. Consecutively with arrays  132  of spray nozzles, each of the plurality of suction extraction shoes  126  also covers the same area of the target floor as spray nozzle arrays  132  at least one, two or more times each second. Furthermore, each of the plurality of suction extraction shoes  126  includes a relatively narrow suction or vacuum extraction passage  136  oriented substantially radially of rotary surface cleaning tool  124 . 
       FIG. 8  illustrates the rotary surface cleaning tool  124  of the rotary surface cleaning machine  100  illustrated in  FIGS. 5, 6 and 7 , wherein rotary surface cleaning tool  124  is mounted on support frame  106  with on-board power plant  122 . Here, by example and without limitation, rotary drive output  128  of on-board power plant  122  is a drive gear coupled to drive circumferential tooth gear  130  disposed about the circumference of rotary surface cleaning tool  124 . However, as disclosed herein, drive means alternative to the rotary gear drive are also contemplated and may be substituted without deviating from the scope and intent of the present invention. 
       FIG. 9  is a partial cross-section view of the rotary surface cleaning machine  100  illustrated in  FIG. 5  through  FIG. 8 , wherein rotary surface cleaning tool  124  is mounted on support frame  106  through a rotary coupling. For example, rotary surface cleaning tool  124  is mounted through a cylindrical sleeve extension  138  of a rotor hub member  140  that is journaled in a bushing  142 . 
     Each of the plurality of spray nozzle arrays  132  is coupled in fluid communication with the pressurized hot liquid solution of cleaning fluid through a cleaning fluid distribution manifold  144  that is in fluid communication with cleaning solution delivery tube  9 . Cleaning fluid distribution manifold  144  includes a central sprue hole  146  for receiving the pressurized cleaning fluid and an expansion chamber  148  for reducing the pressure of the cleaning fluid to below a delivery pressure provided by the supply of pressurized cleaning solution, such as but not limited to supply  23  of pressurized cleaning solution in the cabinet  17  of a truck-mounted system, or another supply of pressurized cleaning solution. Expansion chamber  148  is connected for distributing the liquid cleaning fluid outward along a plurality of radial liquid cleaning fluid distribution channels  150  for delivery by the plurality of spray nozzle arrays  132  uniformly distributed across bottom cleaning surface  72  of rotary surface cleaning tool  124 . Individual radial cleaning fluid distribution channels  150  are uniformly angularly distributed within rotary surface cleaning tool  124 , wherein each of cleaning fluid distribution channels  150  communicates with one of the plurality of spray nozzle arrays  132  for delivery thereto of the pressurized hot liquid solution of cleaning fluid. Radial liquid cleaning fluid distribution channels  150  are optionally extended to an outer circumference  124   a  of the large rotor of surface cleaning tool  124  for ease of manufacturing, and later sealed with plugs  151 . 
     Between adjacent arrays  132  of spray nozzles are distributed radially-oriented suction or vacuum extraction passage  136  each coupled to a vacuum source for retrieving a quantity of soiled cleaning fluid. Radially-oriented plurality of suction extraction shoes  126  are uniformly distributed angularly about rotary surface cleaning tool  124  for uniformly angularly distributing the suction or vacuum extraction passages  136  about rotary surface cleaning tool  124 . Exhaust port  104  communicates with a vacuum plenum  152  within rotor hub member  140 , which in turn communicates through respective suction extraction shoes  126  with each suction or vacuum extraction passage  136 . For example, radially-oriented suction or vacuum extraction passages  136  communicate through individual vacuum plenum branch passages  154  that each communicate in turn with a central cylindrical passage  156  within rotor hub member  140 . Central passage  156  communicates at its upper end through exhaust port  104  with exhaust pipe or hose  102 . 
     As indicated by rotational arrow  158 , rotary surface cleaning tool  124  is rotated at high speed during application of cleaning solution to the target surface. Rotary surface cleaning tool  124  successfully delivers a generally uniform distribution of liquid cleaning solution to a target surface, such as rug  57 , between the quantity of arrays  132  of spray nozzles and the large number of passes, i.e. at least one, two or more passes per second, of each spray nozzle array  132  occasioned by the high rotational speed rotary surface cleaning tool  124  regardless of any lack of uniformity in the instantaneous fluid delivery of any individual spray nozzle array  132 . Additionally, the instantaneous fluid delivery of each individual spray nozzles array  132  tends to be generally uniform at least because the length of the spray nozzle array  132  is minimal as compared with the size of rotary surface cleaning tool  124 . 
       FIG. 10  illustrates rotary surface cleaning tool  124  of the rotary surface cleaning machine  100  illustrated in  FIG. 5  through  FIG. 9 , wherein rotary surface cleaning tool  124  is drivingly connected, for example but without limitation, by a drive gear to rotary drive output  128  of on-board power plant  122 . Here, by example and without limitation, rotary surface cleaning tool  124  is a large rotor that is fixedly attached to a rotary drive member  160  through a fixed coupling  162 , such as a plurality of threaded fasteners (shown) or other conventional fixed coupling means. Rotary drive member  160  includes circumferential tooth gear  130  disposed about the circumference thereof for operating as the drive gear coupled to rotary drive output  128  of on-board power plant  122 . 
     Rotary drive member  160  is mounted to cylindrical sleeve extension  138  of rotor hub member  140  that is in turn journaled in bushing  142 . See, for example,  FIG. 9 . The large rotor of rotary surface cleaning tool  124  is fitted with central sprue hole  146  and includes expansion chamber  148  and the plurality of individual closed liquid cleaning fluid distribution channels  150 , as well as the plurality of spray nozzle arrays  132  that are uniformly distributed across the bottom cleaning surface of rotary surface cleaning tool  124 . The large rotor of rotary surface cleaning tool  124  also includes individual vacuum plenum branch passages  154  that each communicate in turn with central cylindrical passage  156  of rotor hub member  140 , as well as the plurality suction or vacuum extraction passages  136  of respective suction extraction shoes  126  located on rotary surface cleaning tool  124  and projected from open lower axial face  112  of circular housing  110 . 
       FIG. 11  illustrates an upper coupling surface  164  of rotary surface cleaning tool  124  of the rotary surface cleaning machine  100  illustrated in  FIG. 5  through  FIG. 9 , as further illustrated in  FIG. 10 . The large rotor of rotary surface cleaning tool  124  is again illustrated as including expansion chamber  148  and the plurality of individual closed liquid cleaning fluid distribution channels  150  that communicate with the plurality of spray nozzle arrays  132  distributed across the bottom cleaning surface of rotary surface cleaning tool  124 . Here, rotary drive member  160  is removed to more clearly show individual vacuum plenum branch passages  154  that each communicate in turn with central cylindrical passage  156  of rotor hub member  140 . Each individual vacuum plenum branch passage  154  terminates in a fluid extraction passage  166  of about identical radial lengths  168  positioned adjacent to the circumference of the large rotor of rotary surface cleaning tool  124 . In assembly, each shoe  126  is coupled to the lower face of rotary surface cleaning tool  124  with respective suction or vacuum extraction passages  136  in communication with a respective fluid extraction passage  166  of one of the individual vacuum plenum branch passages  154 . As illustrated here by example and without limitation, individual vacuum plenum branch passages  154  optionally include a curved portion  170  inwardly of respective fluid extraction passage  166 . Optional curved portion  170  of vacuum plenum branch passages  154 , when present, operate to urge generation of a Coriolis effect in a suction or vacuum fluid extraction airstream received into central cylindrical passage  156  of rotor hub member  140 . 
       FIG. 12  illustrates a bottom operational surface  172  of rotary surface cleaning tool  124  of the rotary surface cleaning machine  100  illustrated in  FIG. 5  through  FIG. 9 , as further illustrated in  FIG. 10  and  FIG. 11 . The large rotor of rotary surface cleaning tool  124  is again illustrated as including expansion chamber  148  and the plurality of individual closed liquid cleaning fluid distribution channels  150  that communicate with the pluralities of spray nozzle arrays  132  distributed across the bottom operational surface  172  of rotary surface cleaning tool  124 . Spray nozzle arrays  132  are illustrated here by example and without limitation as radially oriented arrays of pluralities of individual delivery spray nozzles  174  of about 1/10,000th of an inch in diameter formed through bottom operational surface  172  of rotary surface cleaning tool  124 , for example by drilling, into communication with respective individual closed liquid cleaning fluid distribution channels  150  for delivery therethrough of the pressurized hot liquid solution of cleaning fluid. As illustrated here by example and without limitation, each spray nozzle array  132  consists of a plurality of individual delivery spray nozzles  174  substantially uniformly distributed over a substantially identical annular portion  176  of bottom operational surface  172  extended between an inner radial limit  178  and an outer radial limit  180  thereof, wherein annular portion  176  covered by delivery spray nozzles  174  has about the same radial extents as radial length  168  of fluid extraction passages  166  of suction extraction shoes  126 , and wherein inner radial limit  178  is about identical with an inner terminus  166   a  of fluid extraction passages  166  and outer radial limit  180  is about identical with an outer terminus  166   b  of fluid extraction passages  166 . Therefore, delivery spray nozzles  174  are distributed over annular portion  176  that is substantially radially coextensive with fluid extraction passages  166 . 
     Each individual fluid extraction passage  166  is positioned adjacent to the circumference of the large rotor of rotary surface cleaning tool  124  and oriented substantially radially thereof approximately halfway between adjacent cleaning solution delivery spray nozzle arrays  132 . As illustrated here by example and without limitation, each individual fluid extraction passage  166  is positioned in a shoe recess  182  formed into rotary surface cleaning tool  124  below bottom operational surface  172  thereof. Each shoe recess  182  is appropriately sized and shaped to receive thereinto one suction extraction shoe  126  with its surrounding flange portion  184  being substantially flush with bottom operational surface  172  of rotary surface cleaning tool  124 . 
     Optionally, a plurality of lightening holes or recesses  186  are provided to reduce the weight of rotary surface cleaning tool  124 . 
       FIG. 13  is a detail view of one embodiment of suction extraction shoe  126  of the rotary surface cleaning machine  100  illustrated in  FIG. 5  through  FIG. 9 . As disclosed herein above, suction extraction shoe  126  is structured to sit in recess  182  flush or below bottom operational surface  172  of rotary surface cleaning tool  124 . Accordingly, flange portion  184  surrounding each suction extraction shoe  126  is structured for being fixed to bottom operational surface  172  of rotary surface cleaning tool  124  within shoe recess  182 . Optionally, suction extraction shoe  126  may include a sealing member  187  structured to fit into preformed slots in bottom operational surface  172  of rotary surface cleaning tool  124  and form a substantially airtight seal therewith to concentrate the force of the fluid extraction suction generated by the vacuum force supplied by vacuum source  25  into individual fluid extraction passages  136  of shoes  126 . 
     Here, suction extraction shoe  126  is shown as having a leading surface  188  and a trailing surface  190  as a function of the rotational direction (arrow  158 ) of rotary surface cleaning tool  124 . As shown here, leading surface  188  is shown by example and without limitation as having an optional relatively raised portion  192  thereof that stands out further from bottom operational surface  172  of rotary surface cleaning tool  124  than a relatively lower or recessed portion  194  of trailing surface  190 . When optional raised portion  192  of suction extraction shoe  126  is present, optional raised portion  192  of suction extraction shoe  126  causes a “washboard” scrubbing effect of a moveable target surface, i.e. carpet surface, wherein up-down oscillations of the moveable carpet are caused by alternate application of vacuum suction and shoe compression of carpet  57 . In other words, the target carpet is initially sucked up toward recessed trailing portion  194  of shoe  126  and operational surface  172  by one suction extraction passage  136 , and then squeezed back down by optional raised portion  192  of leading surface  188  of a next consecutive suction extraction shoe  126 , as illustrated in  FIG. 15 , before being immediately sucked up again by the suction extraction passage  136  of the same next consecutive suction extraction shoe  126 . This alternate vacuum suction and shoe compression of carpet  57  is repeated by each next consecutive suction extraction shoe  126  as a function of the combination of recessed trailing portion  194  and raised leading surface portion  192 . Since rotary surface cleaning tool  124  turns at a high speed rotary motion these up-down oscillations of the moveable carpet are repeated at least one, two or several times each second, which results in significantly aggressive agitation of the target carpet  57  in combination with the fluid cleaning. 
     Alternatively, rotational direction (arrow  158 ) of rotary surface cleaning tool  124  is reversed, whereby optional raised portion  192  is positioned on trailing surface  190  as a function of the reversed rotational direction (arrow  158   a  shown in  FIG. 15 ). Accordingly, the “washboard” scrubbing effect of the moveable target surface, i.e. carpet surface, is accomplished by the recessed leading surface  188  and optional raised portion  192  of each suction extraction shoe  126  in turn. Furthermore, as illustrated here each suction extraction shoe  126  optionally further includes an extension portion  126   a  that overhangs an outer end portion  184   a  of its surrounding flange portion  184 . Extension portion  126   a  permits extraction passages  136  to extend radially outwardly of cleaning tool operational surface  172  beyond the radial extent of fluid extraction passages  166  of rotary surface cleaning tool  124 . Accordingly, when optional extension portion  126   a  is present, suction extraction passages  136  extend nearly to outer circumference  124   a  of the large rotor of surface cleaning tool  124 , as illustrated in  FIG. 15 . 
       FIG. 14  is a detailed cross-section view of one embodiment of suction extraction shoe  126  illustrated in  FIG. 13 , wherein suction extraction shoe  126  is shown as having leading surface  188  and trailing surface  190  as a function of the rotational direction (arrow  158 ) of rotary surface cleaning tool  124 . As shown here, leading surface  188  is shown by example and without limitation as having optional raised portion  192  thereof that stands out further from bottom operational surface  172  of rotary surface cleaning tool  124  than relatively lower or recessed portion  194  of trailing surface  190 . 
       FIG. 15  illustrates bottom operational surface  172  of rotary surface cleaning tool  124  of the rotary surface cleaning machine  100  illustrated in  FIG. 5  through  FIG. 9 , having suction extraction shoe  126  with optional raised surface portion  192  formed on leading surface  188  and relatively lower or recessed surface portion  194  formed on trailing surface  190  as illustrated in  FIG. 13  and  FIG. 14 . Here, suction extraction shoe  126  is illustrated having optional raised surface portion  192  leading and relatively lower or recessed surface portion  194  trailing as a function of the optional counterclockwise rotational direction (arrow  158 ) of rotary surface cleaning tool  124 . It will be understood that suction extraction shoes  126  and rotational direction  158  of rotary surface cleaning tool  124  is optional and can be reversed such that the functional leading surface  188  and functional trailing surface  190  portions thereof are maintained. Accordingly, reversal of rotational directionality  158  of rotary surface cleaning tool  124  disclosed herein by example and without limitation is also contemplated and may be substituted without deviating from the scope and intent of the present invention. Suction extraction shoe  126  are attached to bottom operational surface  172  of rotary surface cleaning tool  124  by attachment means  196 , such as but not limited to one or more threaded fasteners. 
       FIG. 16  illustrates bottom operational surface  172  of rotary surface cleaning tool  124  of the rotary surface cleaning machine  100  illustrated in  FIG. 5  through  FIG. 9 , having a spiral pattern of cleaning solution delivery spray nozzle arrays  132  of individual delivery spray nozzles  174 , wherein each spray nozzle array  132   a ,  132   b ,  132   c ,  132   d  and  132   e  consists of one to about four individual delivery spray nozzles  174 , and wherein individual spray nozzle arrays  132   a ,  132   b ,  132   c ,  132   d ,  132   e  are positioned in a spiral pattern  198  across bottom operational surface  172  of rotary surface cleaning tool  124  that is substantially radially coextensive with radial lengths  137  of fluid extraction passages  136  of shoes  126  between the extremes of annular portion  176  between inner radial limit  178  and outer radial limit  180 . The spiral pattern  198  of spray nozzle array  132   a ,  132   b ,  132   c ,  132   d ,  132   e  optionally proceeds in a uniform stepwise manner around bottom operational surface  172  of rotary surface cleaning tool  124 , with nozzle array  132   a  being nearest to a center point  200  of operational surface  172  and substantially radially coextensive with inner radial limit  178  and each consecutive nozzle array  132   a ,  132   b ,  132   c ,  132   d ,  132   e  stepping further outwardly therefrom toward outer radial limit  180  of operational surface  172 . Alternatively, the stepwise manner of spiral pattern  198  of spray nozzle arrays  132   a ,  132   b ,  132   c ,  132   d ,  132   e  alternatively proceeds in a non-uniform manner (shown) wherein one or more of spray nozzle arrays  132   a ,  132   b ,  132   c ,  132   d ,  132   e  is optionally out of step with an adjacent one of spray nozzle arrays  132   a ,  132   b ,  132   c ,  132   d ,  132   e . Thus, spiral pattern  198  of spray nozzle arrays  132   a ,  132   b ,  132   c ,  132   d ,  132   e  is optionally either uniformly stepwise between inner radial limit  178  and outer radial limit  180  of radial lengths  168  of fluid extraction passages  136  of shoes  126 , else spiral pattern  198  proceeds in a non-uniform manner. Spiral pattern  198  of spray nozzle arrays  132   a ,  132   b ,  132   c ,  132   d ,  132   e  proceeds in either a clockwise manner between inner radial limit  178  and outer radial limit  180  of radial lengths  137  of fluid extraction passages  136  of shoes  126 , else spiral pattern  198  proceeds in a counterclockwise manner without departing from the spirit and scope of the invention. 
     The spiral pattern  198  of spray nozzle arrays  132   a ,  132   b ,  132   c ,  132   d ,  132   e  is effective for delivery of cleaning solution at least because, as disclosed herein, rotary surface cleaning tool  124  turns at a high rate during operation, whereby each spray nozzle array  132   a ,  132   b ,  132   c ,  132   d ,  132   e  delivers the pressurized hot liquid solution of cleaning fluid to the target floor surface at least one, two or more times each second. Furthermore, dividing spray nozzle arrays  132  into several spray nozzle arrays  132   a ,  132   b ,  132   c ,  132   d ,  132   e  reduces the number of individual delivery spray nozzles  174  that have to be drilled or otherwise formed through bottom operational surface  172  of rotary surface cleaning tool  124  by a factor of the number of spray nozzle arrays  132  otherwise provided in rotary surface cleaning tool  124 . Here, as illustrated in  FIG. 12 , there are five radial rows of spray nozzle arrays  132  across operational surface  172 . By dividing spray nozzle arrays  132  into several spray nozzle arrays  132   a ,  132   b ,  132   c ,  132   d ,  132   e , the total number of individual delivery spray nozzles  174  that have to be provided in bottom operational surface  172  is reduced by a factor of five, so that only one-fifth or twenty percent of the number of delivery spray nozzles  174  that have to be provided in bottom operational surface  172 . Delivery spray nozzles  174  are very expensive to drill or otherwise form because they are only about 1/10,000th of an inch in diameter. Therefore, a large cost savings is gained, while the delivery of cleaning solution does not suffer. A further advantage of dividing spray nozzle arrays  132  into several spray nozzle arrays  132   a ,  132   b ,  132   c ,  132   d ,  132   e  is that the cleaning solution is delivered with substantially uniform pressure across the entire radius of rotary surface cleaning tool  124  between inner radial limit  178  and outer radial limit  180 , without resorting to special design features normally required in the prior art to provide uniform pressure across each spray nozzle arrays  132  that extends all of the entire annular portion  176  between inner radial limit  178  and outer radial limit  180  and substantially radially coextensively with fluid extraction passages  136  of suction extraction shoes  126 . Therefore, the optional spiral pattern  198  of spray nozzle arrays  132   a ,  132   b ,  132   c ,  132   d ,  132   e , when present, provides both the economic advantage not known in the prior art of forming fewer expensive delivery spray nozzles  174  for multiple spray nozzle arrays  132  provide across the entire length of annular portion  176  coextensively with fluid extraction passages  136  of shoes  126 , and the technological advantage not known in the prior art of providing substantially uniform cleaning solution delivery pressure across bottom operational surface  172  of rotary surface cleaning tool  124  for the entire length of annular portion  176  without developing special fluid delivery features normally required in the prior art. 
     Optionally, one or more bristle brushes  202  may be provided across bottom operational surface  172  of rotary surface cleaning tool  124  adjacent to cleaning solution delivery spray nozzle arrays  132 , or the optional spiral pattern  198  of spray nozzle arrays  132   a ,  132   b ,  132   c ,  132   d ,  132   e , when present. Bristle brushes  202  may be provided substantially radially coextensively with fluid extraction passages  136  of suction extraction shoes  126  and either adjacent cleaning solution delivery spray nozzle arrays  132 , or the optional spiral pattern  198  of spray nozzle arrays  132   a ,  132   b ,  132   c ,  132   d ,  132   e , when present. Optionally, either multiple radial rows bristle brushes  202  may be provided, else single radial rows of bristle brushes  202  may be provided. Bristle brushes  202  both (1) separate fibers of rug  57  for dry removal of dust, dirt and other particles, and (2) provide a more aggressive cleaning action in cleaning when provided in combination with fluid cleaning of carpet or other target flooring surface. 
       FIG. 17  is a detail view of another embodiment of suction extraction shoe  126  of the rotary surface cleaning machine  100  illustrated in  FIG. 5  through  FIG. 9 , and  FIG. 18  is a detailed cross-section view of the embodiment of suction extraction shoe  126  illustrated in  FIG. 17 . Here, leading surface  188  does not include the optional raised portion  192 . Therefore, leading surface  188  of suction extraction shoe  126  is substantially coplanar with trailing surface  190 . However, leading surface  188  rather includes one or more bristle brushes  204  in one or more rows arranged along an outermost portion  206  thereof. Accordingly, bristle brushes  204  are substituted for optional raised portion  192  of shoe leading surface  188  and stands out further from bottom operational surface  172  of rotary surface cleaning tool  124  than relatively lower or recessed portion  194  of trailing surface  190 . Raised bristle brushes  204  of shoe leading surface  188  operate similarly to optional raised portion  192  disclosed herein. When optional raised bristle brushes  204  of suction extraction shoe  126  is present on shoe leading surface  188 , optional raised bristle brushes  204  cause a “washboard” scrubbing effect of the moveable target surface, i.e. carpet surface, wherein up-down oscillations of the moveable carpet is caused by alternately application of vacuum suction and shoe compression of carpet. In other words, the target carpet is sucked up into narrow suction or vacuum extraction passage  136 , and then squeezed back down by optional raised bristle brushes  204  of leading surface  188  of next consecutive suction extraction shoe  126 , as illustrated in  FIG. 15 . 
     Similarly to optional bristle brushes  202  on bottom operational surface  172  of rotary surface cleaning tool  124 , optional raised bristle brushes  204  on leading surfaces  188  of suction extraction shoes  126  provide a more aggressive cleaning action in cleaning when provided in combination with fluid cleaning of carpet or other target flooring surface. 
     Furthermore, when present optional raised bristle brushes  204  effectively raise bottom operational surface  172  of rotary surface cleaning tool  124  slightly away from target floor surface. Accordingly, rotary surface cleaning tool  124  can be alternated between carpeting and hard floor surfaces such as wood, tile, linoleum and natural stone flooring, without possibility of scarring or other damage to either operational surface  172  of rotary surface cleaning tool  124  or the hard floor surfaces. 
       FIG. 19  illustrates operational surface  172  of rotary surface cleaning tool  124 , wherein suction extraction shoes  126  are configured with substantially coplanar leading and trailing surfaces  188 ,  190  and shoe leading surfaces  188  are configured with one or more bristle brushes  204  in one or more rows arranged along outermost portions  206  thereof. 
       FIG. 20  illustrates rotary surface cleaning tool  124  as disclosed herein, wherein each suction extraction shoe  126  is supported in bottom operational surface  172  by a biasing means  208  structured for individually biasing each suction extraction shoe  126  outwardly relative to bottom operational surface  172  of rotary surface cleaning tool  124 . 
     Additionally, it is generally well known that if a suction slot directly contacts rug  57  or another floor, the suction tool virtually locks onto the rug  57  or floor and becomes immovable. Therefore, the suction tool must be spaced away from the rug  57  or floor to permit some airflow which prevents such vacuum lock-up. Airflow is also necessary for drying the carpet  57  or floor. However, the airflow must be very near the rug  57  or floor to be effective for drying. Also, excessive airflow decreases the vacuum force supplied by the fluid cleaning system. Thus, there is a trade-off between distancing the suction slot from the rug  57  or floor to prevent vacuum lock-up and ensuring mobility on the one hand, and on the other hand positioning the suction slot as near to the rug  57  or floor as possible for maintaining the vacuum force supplied by the fluid cleaning system for maximizing airflow to promote drying. 
     As disclosed herein, suction extraction passages  136  are oriented substantially perpendicular to the counterclockwise or clockwise rotary motion (arrows  158 ,  158   a ) of cleaning tool  124 , i.e., oriented substantially radially with respect to cleaning tool operational surface  172 . Here, suction extraction shoe  126  includes a plurality of shallow vacuum or suction relief grooves  216  formed across its leading surface  188  and oriented substantially perpendicular to suction extraction passages  136 , whereby suction relief grooves  216  lie substantially along the rotary motion (arrows  158 ,  158   a ) of cleaning tool  124 . Shallow suction relief grooves  216  operate to increase airflow to suction extraction passages  136 , while permitting the cleaning tool operational surface  172  to be positioned directly against the rug  57  or floor, whereby moisture extraction is maximized. Another advantage of orienting suction relief grooves  216  along the rotary motion (arrows  158 ,  158   a ) of cleaning tool  124  is that suction relief grooves  216  are carpet pile enters into suction relief grooves  216  when cleaning tool operational surface  172  moves across rug  57 . This permits airflow to be pulled through the rug  57  between fiber bundles that make up the carpet pile so that the rotary motion of cleaning tool  124  is not wasted. 
     The quantity and actual dimensions of suction relief grooves  216  on suction extraction shoes  126  is subject to several factors, including but not limited to, the size and number of suction extraction shoes  126  on operational surface  172  of rotary cleaning tool  124 , width and length dimensions of suction extraction passages  136 , and the vacuum force generated by the suction source, as well as the rotational velocity of cleaning tool operational surface  172 . When relatively raised portion  192  is present in contrast to relatively lower or recessed portion  194 , the resulting height differences between leading surface  188  and trailing surface  190  also affect the quantity and actual dimensions of suction relief grooves  216  on suction extraction shoes  126 . Optionally, suction relief grooves  216  are also optionally positioned on either one or both of leading surface  188  and trailing surface  190  of suction extraction shoes  126 . When positioned on both leading surface  188  and trailing surface  190  of suction extraction shoes  126 , suction relief grooves  216  are also optionally staggered between leading and trailing surfaces  188 ,  190  as shown. Furthermore, the inventors have found that, when optional suction relief grooves  216  of suction extraction shoe  126  are present, optional suction relief grooves  216  of suction extraction shoe  126  is effective for producing the completely unexpected and unpredictable yet desirable result of generating the “washboard” scrubbing effect of a moveable target surface, i.e. carpet surface, wherein up-down oscillations of the moveable carpet are caused by alternate application of vacuum suction and shoe compression of carpet  57 . In other words, the target carpet is initially sucked up toward recessed suction relief grooves  216  of shoe  126  and operational surface  172  by one suction extraction passage  136 , and then squeezed back down by surrounding leading or trailing surfaces  188 ,  190  of suction extraction shoe  126 , before being immediately sucked up again by the suction extraction passage  136  of the same or an adjacent suction relief grooves  216 . This alternating vacuum suction and shoe compression of carpet  57  is repeated constantly by each alternate encounter with surrounding leading or trailing surfaces  188 ,  190  of suction extraction shoe  126  between encounters with adjacent suction relief grooves  216  as a function of the frequency of combination of recessed suction relief grooves  216  within surrounding leading or trailing surfaces  188 ,  190 . The high speed rotary motion of rotary surface cleaning tool  124  causes these up-down oscillations of the moveable carpet are repeated at least one, two or several times each second, which results in significantly aggressive agitation of the target carpet  57  in combination with the fluid cleaning. The size, quantity, relative positioning and distribution and of suction relief grooves  216  is a function of all these factors, but can be determined for any rotary surface cleaning machine  100  without undue experimentation. 
       FIG. 21  is a cross-section view of rotary surface cleaning tool  124  as disclosed herein, wherein both leading surface  188  and trailing surface  190  of suction extraction shoes  126  are illustrated as including suction relief grooves  216 . 
     Here, biasing means  208  is structured by example and without limitation as a resilient cushion, such as a closed-cell foam rubber cushion of about one-quarter inch thickness or thereabout, that is positioned between flange portion  184  of each shoe  126  and rotary surface cleaning tool  124 . For example, each shoe recess  182  is recessed deeper into bottom operational surface  172  of rotary surface cleaning tool  124  than a thickness of shoe flange portion  184 , whereby each shoe recess  182  is appropriately sized to receive resilient biasing cushion  208  between an interface surface  210  of flange portion  184  of suction extraction shoe  126  and a floor portion  212  of shoe recess  182 , while a clamping plate  214  is positioned over shoe flange  184  and arranged substantially flush with bottom operational surface  172  of rotary surface cleaning tool  124 . Accordingly, resilient biasing means  208  permits each suction extraction shoe  126  to “float” individually relative to rotary surface cleaning tool  124 . Individually “floating” each suction extraction shoe  126  both effectively balances rotary surface cleaning tool  124 , and causes each individual suction extraction shoe  126  to be pushed deeper into portions of carpet that may be positioned over small recesses in a non-flat substrate floor surface, as well as pushing causes each individual suction extraction shoe  126  deeper into portions of a non-flat smooth floor surface such as natural rock, distressed wood, and other non-flat or pitted floor surfaces. Therefore, individually “floating” each suction extraction shoe  126  in bottom operational surface  172  of rotary surface cleaning tool  124  cleans carpet and non-carpeted smooth floors alike more effectively than cleaning tools having fixed suction extraction shoes, as known in the prior art. 
     When present as a closed foam cushion, biasing means  208  optionally also operates as a sealing means between suction extraction shoe  126  and rotary surface cleaning tool  124 . Accordingly, biasing means  208  is structured to form a substantially airtight seal with shoe recess  182  in bottom operational surface  172  of rotary surface cleaning tool  124  to concentrate the force of the fluid extraction suction generated by the vacuum force supplied by vacuum source  25  into individual fluid extraction passages  136  of shoes  126 . Optionally, closed foam cushion biasing means  208  is substituted for sealing member  187  for sealing suction extraction shoe  126  relative to rotary surface cleaning tool  124 . However, although disclosed herein by example and without limitation as a closed foam rubber cushion, biasing means  208  is optionally provided as any resilient biasing structure, including one spring or a series of springs, without deviating from the scope and intent of the present invention. Accordingly, biasing means alternative to the closed foam rubber cushion biasing means  208  disclosed herein by example and without limitation are also contemplated and may be substituted without deviating from the scope and intent of the present invention. 
       FIG. 22  is a detail view of another embodiment of suction extraction shoe  126  of the rotary surface cleaning machine  100  illustrated in  FIG. 5  through  FIG. 9 , wherein each suction extraction shoe  126  is structured for accomplishing the “washboard” scrubbing effect of the moveable target surface, i.e. carpet surface, independently of the next consecutive suction extraction shoe  126 . Here, suction extraction shoe  126  is again shown as having functional leading surface  188  and functional trailing surface  190  both as a function of the reversed rotational direction (arrow  158   a ) of rotary surface cleaning tool  124 , shown as clockwise in  FIG. 24 . As shown here, leading surface  188  is shown by example and without limitation as having optional relatively lower or recessed portion  194 , while trailing surface  190  is shown as having optional raised portion  192  thereof that stands out further from bottom operational surface  172  of rotary surface cleaning tool  124  than relatively lower or recessed leading surface portion  194 . 
     When optional recessed portion  194  and raised portion  192  of suction extraction shoe  126  are present on leading surface  188  and trailing surface  190 , respectively, the relative difference in height of recessed leading portion  194  and raised trailing portion  192  combine in each suction extraction shoe  126  to independently operate the “washboard” scrubbing effect of a moveable target surface, i.e. carpet surface, wherein up-down oscillations of the moveable carpet are caused by alternate application of vacuum suction and shoe compression of carpet  57 . In other words, the target carpet  57  is initially sucked up toward recessed leading portion  194  of suction extraction shoe  126  by the action of suction or vacuum extraction passage  136 , and then squeezed back down by optional raised trailing portion  192  of trailing surface  190  of the same suction extraction shoe  126 , as illustrated in  FIG. 24 . Each consecutive suction extraction shoe  126  operates independently of the other suction extraction shoes  126  of rotary surface cleaning tool  124  to operate suction or vacuum extraction passage  136  to initially suck up the target carpet  57  toward recessed leading portion  194 , before the raised trailing portion  192  of the same suction extraction shoe  126  consecutively compresses the target carpet  57  back down toward the underlying floor surface. This alternate vacuum suction and shoe compression of carpet  57  is repeated independently by each consecutive suction extraction shoe  126 . Since rotary surface cleaning tool  124  turns at a high speed rotary motion these up-down oscillations of the moveable carpet are repeated at least one or several times each second, which results in significantly aggressive agitation of the target carpet  57  in combination with the fluid cleaning. 
     Additionally, suction extraction shoe  126  is illustrated having a plurality of shallow vacuum or suction relief grooves  216  formed across relatively raised portion  192  thereof and oriented substantially perpendicular to suction extraction passages  136 . Suction relief grooves  216  are formed across either leading surface  188  or trailing surface  190  as a function of the counterclockwise or clockwise rotary motion (arrows  158 ,  158   a ) of cleaning tool  124 . As disclosed herein, suction extraction passages  136  are oriented substantially radially with respect to cleaning tool operational surface  172  and substantially perpendicular to the counterclockwise or clockwise rotary motion (arrows  158 ,  158   a ) of cleaning tool  124 , whereby suction relief grooves  216  lie substantially along the rotary motion (arrows  158 ,  158   a ) of cleaning tool  124 . Suction relief grooves  216  formed across relatively raised portion  192  of suction extraction shoe  126  and oriented substantially radially with respect to cleaning tool operational surface  172  and along the rotary motion (arrows  158 ,  158   a ) of cleaning tool  124  provide the advantages disclosed herein. Suction relief grooves  216  permit suction extraction passages  136  of suction extraction shoes  126  to be positioned as near to the rug  57  or floor as possible for maintaining the vacuum force supplied by the fluid cleaning system for maximizing airflow to promote drying, while preventing vacuum lock-up and ensuring mobility on the one hand. 
     Again, as disclosed herein, the quantity and actual dimensions of suction relief grooves  216  on suction extraction shoes  126  are subject to such factors as the size and number of suction extraction shoes  126  on operational surface  172  of rotary cleaning tool  124 , the width and length dimensions of suction extraction passages  136 , and the vacuum force generated by the suction source, as well as the rotational velocity of cleaning tool operational surface  172 . When relatively raised portion  192  is present in contrast to relatively lower or recessed portion  194  as shown, the resulting height difference between leading surface  188  and trailing surface  190  also affects the quantity and actual dimensions of suction relief grooves  216  on suction extraction shoes  126 . Optionally, suction relief grooves  216  are also optionally positioned on relatively raised portion  192  of either of leading surface  188  or trailing surface  190  of suction extraction shoes  126 . The size, quantity, relative positioning and distribution and of suction relief grooves  216  is a function of all these factors, but can be determined for any rotary surface cleaning machine  100  without undue experimentation. 
       FIG. 23  is a detailed cross-section view of the embodiment of suction extraction shoe  126  illustrated in  FIG. 22 , wherein suction extraction shoe  126  is shown as having leading surface  188  and trailing surface  190  as a function of the reversed clockwise rotational direction (arrow  158   a ) of rotary surface cleaning tool  124 . As shown here, leading surface  188  is shown by example and without limitation as having optional relatively lower or recessed portion  194 , while trailing surface  190  is formed with relatively raised portion  192  thereof that stands out further from bottom operational surface  172  of rotary surface cleaning tool  124  than relatively lower or recessed portion  194  of leading surface  188 . 
       FIG. 24  illustrates bottom operational surface  172  of rotary surface cleaning tool  124  of the rotary surface cleaning machine  100  illustrated in  FIG. 5  through  FIG. 9 , having suction extraction shoe  126  with relatively lower or recessed surface portion  194  formed on leading surface  188 , and optional raised surface portion  192  formed on trailing surface  190  as illustrated in  FIG. 22  and  FIG. 23 . Here, rotational direction of rotary surface cleaning tool  124  is reversed, whereby rotary cleaning tool  124  operates in a clockwise direction (arrow  158   a ) in contrast to the counterclockwise direction  158  illustrated in  FIG. 15 . As illustrated here, optional relatively recessed portion  194  is positioned on leading surface  188  of suction extraction shoe  124 , while relatively raised portion  192  is positioned on trailing surface  190  as a function of the reversed clockwise rotational direction (arrow  158   a ). Accordingly, the “washboard” scrubbing effect of the moveable target carpet  57  is accomplished by each suction extraction shoe  126  as a function of the combination therein of recessed portion  194  of leading surface  188  and raised portion  192  of trailing surface  190  in turn engaging the movable target carpet  57 . 
     While the preferred and additional alternative embodiments of the invention have been illustrated and described, it will be appreciated that various changes can be made therein without departing from the spirit and scope of the invention. Therefore, it will be appreciated that various changes can be made therein without departing from the spirit and scope of the invention. Accordingly, the inventor makes the following claims.