Patent Publication Number: US-9895704-B2

Title: Surface cleaning device and method of operation

Description:
BACKGROUND 
     Technical Field 
     The technical field relates generally to an apparatus and method related to the use of pressure washing tools or surface cleaning devices. 
     Background Information 
     A variety of surface cleaners are known which expel pressurized water onto a surface to clean the surface. Some of these cleaners include nozzle assemblies which rotate as water is expelled as high pressure water jets from nozzles of the nozzle assemblies during the cleaning process. While the rotation of such nozzle assemblies have previously been driven by pneumatic or other systems, there remains a need for improvement in this area. 
     SUMMARY 
     In one aspect, a surface cleaner may comprise a frame; a rotatable platform mounted on the frame; and a nozzle assembly mounted on the platform; wherein the nozzle assembly rotates relative to the platform in response to rotation of the platform relative to the frame. 
     In another aspect, a surface cleaner may comprise a frame; a water feed line; a rotatable platform mounted on and rotatable relative to the frame; a first water swivel having a first portion and a second portion which is rotatable relative to the first portion, wherein the first portion is connected to the water feed line and the second portion is mounted on and rotatable with the platform; an essentially circular perimeter of the frame; a drive train wheel assembly which is mounted on and rotatable relative to the platform and which comprises an axle, a first drive wheel secured to the axle and a second drive wheel secured to the axle, wherein the first drive wheel engages the essentially circular perimeter of the frame; a second water swivel which is mounted on and rotatable with the platform and which has a first portion and a second portion which is a nozzle assembly rotatable relative to the first portion; a conduit extending from an outlet of the second portion of the first water swivel to an inlet of the first portion of the second water swivel; a drive shaft conduit of the nozzle assembly; a third drive train wheel secured to the drive shaft conduit; and a drive loop which engages the second and third drive train wheels. 
     In another aspect, a method may comprise the steps of rotating a rotatable platform relative to a frame of a surface cleaner to cause rotation of a nozzle assembly which is rotatably mounted on the platform and comprises a nozzle; and moving water through the nozzle to form a water jet which impacts a target surface. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
       A sample embodiment is set forth in the following description, is shown in the drawings and is particularly and distinctly pointed out and set forth in the appended claims. 
         FIG. 1  is a side elevation view of the surface cleaner with portions removed. 
         FIG. 2  is a bottom plan view of the surface cleaner shown in  FIG. 1 . 
         FIG. 2A  is a diagrammatic sectional view taken on line  2 A- 2 A of  FIG. 1  showing part of the drive train. 
         FIG. 3  is a top plan view of the surface cleaner of  FIG. 1 . 
         FIG. 4  is an enlarged view of the encircled portion of  FIG. 3 . 
         FIG. 5  is a sectional view taken on line  5 - 5  of  FIG. 4 . 
         FIG. 6  is a sectional view taken on line  6 - 6  of  FIG. 4 . 
         FIG. 7  is a sectional view taken on line  7 - 7  of  FIG. 6 . 
         FIG. 8  is a top plan view similar to  FIG. 3  showing the operation of various components. 
         FIG. 9  is a bottom plan view similar to  FIG. 2  showing the operation of various components. 
     
    
    
     Similar numbers refer to similar parts throughout the drawings. 
     DETAILED DESCRIPTION 
     A surface cleaning device or surface cleaner is shown generally at  1  in  FIGS. 1-3 . Cleaner  1  may include a rigid frame  2 , a plurality of wheels  4 A- 4 C which are rotatably mounted on the frame, a handle  6  which is mounted on the frame extending rearwardly therefrom (only a portion shown), a water system or assembly  8  and a nozzle assembly drive train  10  configured to rotate nozzle assemblies  12  ( FIG. 2 ) of the water assembly  8 . Nozzle assemblies  12  are configured to eject or shoot water jets onto a target surface  14  to be cleaned. Cleaner  1  may include a vacuum system or assembly  9  which may include a vacuum hose  11 . 
     Cleaner  1  and/or frame  2  may have a front  16  and a back  18  defining therebetween a longitudinal direction, a top and bottom  20  and  22 , and left and right sides  24  and  26  defining therebetween an axial direction of the cleaner or frame. Wheels  4 A are rotatably mounted adjacent the rear ends  18  of frame  2  to rotate about a common horizontal axis which extends in the axial direction from left to right. Likewise, wheels B may be rotatably mounted on frame  2  along a rear section thereof and forward of wheels  4 A to rotate about a horizontal axis which may be parallel to the axis about which wheels  4 A are rotatable. Wheels  4 B may be drive wheels for driving the forward and rearward movement of cleaner  1  along surface  14 . The front wheels  4 C may be caster wheels such that they are rotatably mounted on a caster bracket to rotate about a horizontal axis with the caster bracket being rotatably mounted about a vertical axis on frame  2  adjacent front end  16  thereof. Wheels  4  are thus ground-engaging or surface-engaging wheels which engage ground or surface  14 . Only a portion of handle  6  is shown for simplicity. It is well-known in the art that various controls may be mounted on handle  6  in order to control the various operations of cleaner  1 , such as a control of the forward and rearward movement of the cleaner via drive wheels  4 B, the flow of water through water system  8  to provide the cleaning water jets, and/or other motors or actuators such as pneumatic motors, hydraulic motors or electric motors. 
     Frame  2  may include a rear section  28  and a front section  30  which is secured to and extends forward from the front of rear section  28  to the front or front end  16 . Front section  30  of frame  2  may include an annular sidewall  32  which may be circular as viewed from above and which may include a lower or skirt ring  34 , an intermediate ring  36  which is secured to and extends upwardly from lower ring  34 , and an upper or bearing ring  38  which is secured to and extends upwardly from intermediate ring  36 . Lower ring  34  and intermediate ring  36  may be secured to one another by various fasteners or screws  40  ( FIG. 5 ), and likewise upper ring  38  and intermediate ring  36  may be secured to one another by various fasteners or screws  40  or the like. Front section  30  may further include a plurality of uprights or posts  42  which are rigidly secured to and extend upwardly from upper ring  38 . The same fasteners or screws  40  which are used to secure intermediate ring  36  to upper ring  38  may likewise be used to secure rings  36  and  38  and posts  42  to one another. Posts  42  may lie along a common circle as viewed from above and may be positioned around a space  43  ( FIGS. 3, 5 ) which may extend upwardly from adjacent the bottom of posts  42  to adjacent the top of posts  42 . Space  43  may extend upwardly from adjacent the top of sidewall/ring  38  and upwardly above the top of sidewall  32 /ring  38 . An upper portion of sidewall  32 /ring  38  may be disposed in space  43 . 
     Front section  30  may further include a drive train ring assembly or gear ring assembly  44  which may include an annular mounting flange  46  and a drive train ring or gear ring  48 . Ring assembly including flange  46  and ring  48  may be spaced upwardly of the top of sidewall  32  and ring  38  adjacent the top of space  43  along the outer perimeter of space  43 . Portions of flange  46  and/or ring  48  may be directly above portions of sidewall  32 . Ring assembly  44  may be rigidly secured to the top of posts  42  such as by a plurality of fasteners or screws  40  which may extend from flange  46  to a respective post  42 . Ring  48  may be secured to and extend radially inwardly from flange  46 . Both flange  46  and ring  48  may be circular as viewed from above and may be essentially horizontal as viewed from the side. Ring  48  may include an annular wall  50  with a plurality of gear teeth  52  extending therefrom. Annular wall  50  may have an essentially circular inner perimeter  51  along which gear teeth  52  may be formed. In the sample embodiment, gear teeth  52  extend along the entire circumference of annular wall  50  and may extend radially inwardly therefrom as shown in the figures although teeth  52  may extend in other directions. For instance, a ring similar to ring  48  may be formed with a set of teeth extending radially outward from an annular wall such that the set of teeth extend along an essentially circular outer perimeter of the annular wall or ring. Similar teeth may also extend downwardly, upwardly or at various angles from an annular wall of a ring analogous to ring  48  (for instance, the ring may be a beveled gear ring with teeth extending outwardly from an annular wall at about 30 or 45 or 60 degrees or another angle relative to horizontal or vertical). Gear teeth  52  may be in any of these cases arranged along a circle or circular path as viewed from above. The inner circumference or perimeter  51  of gear ring  48  or gear teeth  52  define therewithin a generally horizontal space  54  which may be circular as viewed from above. Space  54  may have a top or top entrance opening  56  and a bottom or bottom entrance opening  58  inasmuch as space  54  opens upwardly and downwardly. 
     A skirt  60  may be secured to and extend downwardly from the bottom of skirt ring  34  and may include multiple bristles  62  arranged generally in an annular or circular fashion as viewed from below. Skirt  60  may also include a seal  64  which may be formed of an elastomer or plastic material for example. Seal  64  may have an annular circular configuration as well. The bottom of skirt  60  may be closely adjacent or in contact with target surface  14  when cleaner  1  is being used to clean surface  14 . 
     One or more wheel drive motors or actuators  66  ( FIG. 2 ) may be mounted on a rear section  28  of frame  2  and may be operatively connected to drive wheels  4 B in order to drive rotation of wheels  4 B to effect forward, rearward or other movement of cleaner  1  along surface  14 . Motors or actuators  66  may be for example pneumatic, hydraulic or electric motors or actuators. 
     Water system or assembly  8  may include a source of water with a pump which is in fluid communication with nozzle assemblies  12  via various conduits and water swivels. Assembly  8  may include a main water feed line  68  which may extend over a portion of flange  46 , ring  48  and space  54  and which may be connected at a front end thereof to an inlet of a central water swivel  70 . There may be one or more additional water swivels such as swivels  72 A and  72 B which may be spaced from one another and swivel  70  such that swivel  70  is generally or directly between swivels  72 A and  72 B. Swivels  72  may be referred to as nozzle assembly water swivels. Swivel  70  may have an upper or first swivel portion  74  and a second or lower swivel portion  76  such that portion  74  is rotatable relative to portion  76  about a vertical axis X 1 . Each of swivels  72  has a first or upper swivel portion  78  and a second or lower swivel portion which is also the corresponding nozzle assembly  12  such that portion or assembly  12  of swivel  72 A is rotatable relative to portion  78  of swivel  72 A about a vertical axis X 2  and portion or assembly  12  of swivel  72 B is rotatable relative to portion  78  of swivel  72 B about a vertical axis X 3 . Thus, each of axes X 1 , X 2  and X 3  may be parallel to one another and may also lie in a common vertical plane. Part of or a majority of lower portion  76  of swivel  70  may be in space  43 . Likewise, part of or a majority of upper portion  78  of each swivel  72 A and  72 B may be in space  43 . 
     A pair of water conduits  80  may be connected to and extend between respective outlets  82  of swivel portion  76  of swivel  70  and respective inlets  84  of portions  78  of swivels  72 A and  72 B. Each nozzle assembly  12  may include a nozzle assembly drive shaft conduit  86 , a nozzle arm or bar  88  and a plurality of nozzles  90 . The water system or water assembly components thus define respective water passages or water flow passages which form a water flow pathway such that this pathway and the water flow are represented by Arrows A in  FIGS. 1 and 3-6 . More particularly, when water is being pumped through the water system, water may flow from a source of water through feed line  68  and into the main swivel  70  through the inlet of portion  74  of swivel  70 , through swivel  70  and the outlets  82  thereof, through conduits  80  and inlets  84  of the respective swivel  72 A and  72 B, through swivels  72 A and  72 B into and through nozzle assemblies  12  including conduit  86  and bar  88 , and out of the respective nozzles  90  as water jets which impact target surface  14  to clean surface  14 . 
     A drive train wheel or sheave  92  may be mounted on conduit  86  and extend radially outwardly therefrom, and may have an essentially circular outer perimeter  93 . Conduit  86  may be essentially vertical and have a portion extending upwardly within portion  78  of the given swivel  72  and a portion which extends downwardly below and out of portion  78  of a given swivel  72 . Nozzle arm or bar  88  may be secured to the bottom of conduit  86  and extend radially outwardly therefrom and may be essentially horizontal. Bar  88  may have portions that extend in opposite directions from one another away from the connection with conduit  86 . Nozzles  90  may be secured to and extend downwardly from arm  88  such that nozzles are spaced radially outwardly of conduit  86 . Nozzles  90  ay be directed downwardly and toward target surface  14  when cleaner  1  is in its operational position with its bottom against or adjacent surface  14 , which may include the various wheels  4  being in contact with surface  14  and skirt  60  adjacent or in contact with surface  14 . 
     As viewed from above, swivels  70  and  72  and conduits  80  may be or extend within the circles or vertical cylinders defined by the inner perimeters of sidewall  32 , flange  46 , ring  48 , and swivel  70  may be at the center of said circles or vertical cylinders. Part of or a majority of each conduit  80  may be in space  43 . Portions of swivels  70  and  72  and conduits  80  may extend within space  54 , and/or above space  54  and flange  46  and ring  48 , and/or below space  54  and flange  46  and ring  48 . 
     The water system or assembly, including the various conduits, water swivels and nozzle assemblies, may be essentially the same as or similar to those described in U.S. Patent Application Publication 2013/0118529 of Gromes Sr., which is incorporated herein by reference. 
     Nozzle assembly drive train  10  is now described in greater detail. A motor  94  ( FIGS. 1, 3 ) may be provided to drive rotation of nozzle assemblies  12  via drive train  10 . Motor  94  may be a pneumatic motor, a hydraulic motor or an electric motor, for example. Motor  94  may be secured to rear section  28  of frame  2  and have a rotational output or drive shaft  96  ( FIG. 2A ) which may be rotatable about a vertical axis X 4  ( FIGS. 1, 2A, 3 ). With primary reference to  FIG. 2A , drive train  10  may include a drive train wheel  98  having an essentially circular outer perimeter  100 . Wheel  98  may include sprocket teeth  102  all along the outer perimeter  100  thereof. Wheel  98  may be rigidly secured to and extend radially outwardly from rotational output  96  such that wheel  98  may rotate with output  96  about axis X 4 . Outer perimeter  100  may be concentric about axis X 4 . 
     Drive train  10  may further include a drive train plate or wheel  104  which may be positioned to rotate about axis X 1 . Drive train wheel  104  may be substantially horizontal and may have an essentially circular outer perimeter  106  which may be essentially concentric about axis X 1 . Wheel  104  may be entirely higher than the top of sidewall  32 . Wheel or plate  104  may include a set of multiple teeth  108  all along its outer perimeter  106 . Perimeter  106 /set of teeth  108  may in its entirety extend adjacent sidewall  32  and may be directly above or higher than sidewall  32 . 
     Drive train  10  may further include a flexible drive loop  110  which may be a closed loop in the form of a chain or flexible belt. Drive loop  110  may extend from rearward of the back of sidewall  32  forward to adjacent the front of sidewall  32  and front end  16  of frame  2 /cleaner  1 . Drive loop  110  may also extend adjacent the left and right sides of sidewall  32  and left and right sides  24  and  26  of frame  2 /cleaner  1 . Drive loop  110  may be looped around wheels  98  and  104  and may engage said wheels along their outer perimeters  100  and  106 . Loop  110  may engage teeth  102  and  108  when wheels  98  and  104  include such teeth. The rotation of wheel  98  causes or drives rotation of wheel  104  via drive loop  110 , which is caused to revolve by the rotational movement of wheel  98 . Said in another way, the rotational movement of drive train wheel  98  may be translated to rotational movement of drive loop  110 , which may be translated to rotational movement of wheel  104 . Drive train wheel  104  typically has a substantially larger diameter than drive train wheel  98 , and may have a diameter which is at least two or three times that of wheel  98 . A tensioner wheel  112  may be provided to engage loop  110  to provide sufficient tension to loop  110 . 
     With primary reference to  FIG. 5 , wheel  104  may be part of a rotatable platform  114  which may also include a bearing ring  116  with a plurality of fasteners  118  which rigidly secure ring  116  to wheel  104 . Fasteners  118  may include threaded bolts which pass through corresponding holes in plate  104  and ring  116 , along with nuts which threadedly engage the bolts. Ring  116  may extend downwardly from the bottom of plate  104  adjacent and spaced inwardly of the outer perimeter  106 /teeth  108  of plate  104  such that outer perimeter  106 /teeth  108  extend radially outwardly beyond the outer perimeter of ring  116 . Rotatable platform  114  may be rotatably mounted on front section  30  of frame  2  by a plurality of roller bearings or ball bearings  120  (only one shown in  FIG. 5 ) which are positioned along the circular outer perimeter of bearing ring  116  and along the circular inner perimeter of bearing ring  38 . Upper and lower annular seals  122  may be provided directly above and below the bearings  120  to help prevent water and other undesired materials from entering the space between the inner perimeter of bearing ring  38  and outer perimeter of bearing ring  116 . Seal  122  may be formed of an elastomeric material or other suitable material. 
     Platform  114  and sidewall  32  of front section  30  may together form a nozzle assembly housing  124  which defines a nozzle assembly housing cavity  126  having a bottom entrance opening  128 . Wheel/plate  104  may define the top of cavity  126 , and the inner surface of sidewall  32  may define the outer perimeter of cavity  126 . Vacuum hose  11  may be in fluid communication with nozzle assembly housing cavity  126 . Nozzle assembly conduits  86  may extend downwardly from above plate  104  and ring  116  through respective through holes in plate  104  and ring  116  to below plate  104  and ring  116  within cavity  126  such that a portion of each conduit  68  is above platform  114 , a portion within one of the through holes in platform  114  and a portion below platform  114  within cavity  126 . Bar  88  and nozzles  90  of nozzle assemblies  12  may be entirely within cavity  126  adjacent sidewall  32 . 
     Various components are mounted on rotatable platform  114  and thus rotatable therewith about axis X 1 . These components may include portion  76  of swivel  70 , swivel  72 A and  72 B, conduits  80  and various components of drive train  10 . Portion  76  of swivel  70  may be secured to wheel  104  of platform  114  and extend upwardly therefrom. Similarly, portion  78  of each swivel  72  may be secured to wheel  104  of platform  114  and extend upwardly therefrom. 
     With primary reference to  FIG. 6 , drive train  10  may further include a drive train wheel or gear or pinion  130 , a drive shaft or axle  132 , a drive train wheel or sheave  134  and a flexible drive loop  136 . Wheel  130  may be rigidly secured to axle  132  and extend radially outwardly therefrom adjacent a top end of axle  132 . Wheel  134  may be rigidly secured to and extend radially outwardly from axle  132  adjacent a lower end of axle  132 . Thus, wheels  130  and  134  may rotate together with axle  132  about a vertical axis X 5  which may be parallel to the other axes X 1 , X 2 , X 3  and X 4 . Each set of wheels  130  and  134  and a given axle  132  together may be referred to as a drive train wheel assembly or a pinion assembly which is rotatable about axis X 5 . Wheel  130  may have an essentially circular outer perimeter  138  and may have formed along perimeter  138  gear teeth  140  extending around the entire perimeter  138 . Wheel  134  may have an essentially circular outer perimeter  142 . In the sample embodiment, gear teeth  140  may extend radially outwardly as shown in the figures although teeth  140  may extend in other directions. For instance, a wheel similar to wheel  130  may be formed with a set of teeth extending downwardly, upwardly or at various angles (for instance, the wheel may be a beveled gear with teeth extending outwardly at about 30 or 45 or 60 degrees or another angle relative to horizontal or vertical). 
     With primary reference to  FIGS. 3-6 , wheel  130  may be within or adjacent space  54  and in engagement with ring  48  of front section  30  of frame  2 . Outer perimeter  138  of wheel  130  may be in contact with or engage inner perimeter  51  of ring  48 . Where inner perimeter  51  includes gear teeth  52  and outer perimeter  138  includes gear teeth  140 , teeth  52  and  140  may engage or mesh with one another. Drive loop  136  may engage and be looped around wheels  92  and  134  such that rotation of shaft  132  and wheels  130  and  134  about axis X 5  causes revolution or revolving movement of drive loop  136  which in turn causes rotation of wheel  92  and nozzle assembly  12  including shaft or conduit  86 , bar  88  and nozzles  90 . Wheels  92  and  134  may be sheaves such that drive loop  136  may be a flexible drive belt which engages sheaves  92  and  134  generally along or adjacent outer perimeters  93  and  142 . Likewise, wheels  92  and  134  may be sprockets having teeth such that drive loop  136  may be a chain which engages the teeth of the sprockets along the outer perimeters  93  and  142  thereof. Wheels  92  and  134  and axle  132  may be in or extend within space  43 . Wheel  130  may extend within or be adjacent an upper portion of space  43 . 
     With primary reference to  FIGS. 3-6 and 7 , various components are mounted on rotatable platform  114  and rotate therewith about axis X 1 . In addition to swivels  72 A and  72 B and portion  76  of swivel  70 , these components may include a pair of mounting blocks or plates  144  and a corresponding pair of rigid chambers  146  which are pivotally mounted on plate  104  via mounting plate  144  to respectively pivot about axes X 2  and X 3  relative to platform  114 . Each mounting block  144  may be rigidly secured to plate  104  such as by various bolts or fasteners or other means known in the art and may extend upwardly therefrom within a lower portion of space  43 . Each chamber  146  may also be in or extend within space  43 . Chamber  146  has a top wall, bottom wall and sidewall which define therewith an interior chamber  148  ( FIGS. 5-7 ) in which may be disposed wheels  92  and  134  along with drive loop  136 . In addition, a lower end of shaft  132  is disposed in interior chamber  148 , as is a portion of shaft or conduit  86 . Portion  78  of swivel  72 A is secured to and extends upwardly from the top wall of one of chambers  146 . Likewise, portion  78  of swivel  72 B is secured to and extends upwardly from the top wall of the other chamber  146 . Also amongst the components which may rotate with platform  114  are a pair of axle housings  150  which may be secured to and extend upwardly from the top walls of respective chambers  146  within space  43 . Axles  132  are rotatably mounted on and pass through one of axle housings  150 . Each housing  150  along with its drive train wheel assembly and walls of chamber  146  may be rotatable relative to platform  114 . Also amongst the components which may rotate with platform  114  may be a pair of biasing units  152  each which may be mounted on the top of plate  104  and extend upwardly therefrom within space  43 . Each unit  152  may include a first member or cylinder  154 , a second member or piston  156 , a mount  158  and an internal spring  160 . First member or cylinder  154  may be secured to plate  104  by mount  158  and bolts or other fasteners or the like. First member  154  may be secured so as to be fixed relative to plate  104 . Second member  156  may be a movable member or piston which is movable relative to first member  154  and platform  114 . First member  154  may be a cylinder or define an interior chamber in which a portion of the first member or piston  156  is disposed with a second portion thereof extending outwardly from the first member or cylinder. A spring  160  may be disposed within first member or cylinder  154  to bias the second member or piston  156  outward away from cylinder  154  and toward chamber  146 . More particularly, the movable member or piston  156  may have a tip or surface which engages an outer surface of chamber  146  in order to bias wheel  130  toward or against ring  48 , which may mean biasing perimeter  138  against perimeter  51  or teeth  140  against teeth  52 . This biasing movement or direction is illustrated at Arrow B in  FIGS. 4 and 7 . 
     In order to clean surface  14  with cleaner  1 , the operator may position cleaner  1  atop surface  14  with wheels  4  in contact with surface  14  and skirt  60  in contact or closely adjacent surface  14 . The operator of cleaner  1  may then manipulate various controls typically located on handle  6  in order to cause water to flow through the water pathway represented by Arrows A as previously discussed in order to create water jets (lower Arrows A in  FIG. 5 ) which are expelled through nozzles  90  to impact surface  14 . As water is being ejected or forced through nozzles  90  onto surface  14 , the vacuum system  9  may be operated to suction water out of housing cavity  126  through vacuum hose  11  and cleaner  1  may be moved along surface  14  via rolling on wheels  4 . 
     While water is being directed through nozzles  90  onto target surface  14  and also being suctioned out of cavity  126  through hose  11 , and while cleaner  1  is stationary or rolling on surface  14 , nozzle assemblies  12  may be rotated about the respective axes X 2  and X 3  in response to the driving rotation of the rotational output  96  ( FIG. 2A ) of motor  94  ( FIG. 8 ). Nozzle assemblies  12  may also rotate in response to rotation or revolving movement of the various components of drive train  10 . More particularly and with primary reference to  FIGS. 8 and 9 , motor  94  may be operated or turned on to drive rotation of output or shaft  96  ( FIG. 2A ) to in turn drive the rotation of wheel  98  (Arrow C in  FIG. 8 ) about axis X 4 . The rotation of wheel  98  in turn drives the revolution or revolving movement (Arrow D in  FIG. 8 ) of drive belt  110  which in turn causes the rotation (Arrows E in  FIGS. 8, 9 ) of rotatable platform  114  about axis X 1 . As previously noted, various components are rotatable with platform  114 , whereby the rotation of platform  114  likewise includes the rotation of these various components, including swivels  72 A and  72 B, portion  76  of swivel  70 , axles  132 , wheels  130 , wheels  134 , wheels  92 , mounting blocks  144 , chambers  146 , biasing units  152  and nozzle assemblies  12 . The rotation of platform  114  and these various components mounted thereon or carried thereby may rotate in the same direction as wheel  98  and output  96 . During the rotation of platform  114  about axis X 1  as shown at Arrow C, the engagement between the outer perimeters  138 /teeth  140  of respective wheels or gears  130  may engage the inner perimeter  51 /teeth  52  of ring  48 , thereby causing the rotation (Arrows F in  FIGS. 7, 8 ) of wheels  130 , axles  132  and wheels  134  about respective axes X 5 , wherein the same rotation represented by Arrows F may be the opposite direction as the rotation of the various components represented by rotation of Arrows E and Arrow C. Rotation of wheel  134  drives the revolution or revolving movement (Arrow G in  FIG. 7 ) of drive loop  136 , which in turn drives the rotation (Arrow H in  FIG. 7 ) about axis X 2  or X 3  of the given wheel  92  and nozzle assembly  12  including the conduit  86 , bar  88  and nozzles  90  thereof. The given wheel  92  and nozzle assembly  12  may thus rotate in the same direction as the components indicated by Arrow F. 
     The various components of drive train  10  may include drive train components which are upstream or downstream of other drive train components of drive train  10 . Thus, rotation or revolving movement of a given relatively upstream drive train component which is upstream of a given relatively downstream drive train component may cause or drive the corresponding rotation or revolving movement of the given relatively downstream drive train component. It may also be said that a given relatively downstream drive train component which is downstream of a given relatively upstream drive train component may rotate or revolve in response to the corresponding rotation or revolving movement of the given relatively upstream drive train component. 
     In the foregoing description, certain terms have been used for brevity, clearness, and understanding. No unnecessary limitations are to be implied therefrom beyond the requirement of the prior art because such terms are used for descriptive purposes and are intended to be broadly construed. Moreover, the description and illustration set out herein are an example not limited to the exact details shown or described.