Abstract:
A vehicle washer of the rollover type especially suitable for washing large vehicles such as buses and trucks. The washer includes an overhead carriage moving along an overhead guide rail structure and including opposed L-shaped spray arms adapted to wash top and side surfaces of the vehicle as the carriage moves along the guide rail and move in butterfly fashion as the carriage reaches a respective end of the vehicle whereby to wash that end of the vehicle. A recirculating arrangement insures that the hot water arriving at the carriage from the equipment room is at a predetermined hot temperature; a flexible carrier folds and unfolds in a trough along the rail structure and threadably receives the various supply conduits to provide effective transport of the required wash elements to the carriage; a compound bearing structure on the carriage efficiently journals the pivotal ends of the very large and heavy spray arms required to process large vehicles; a unique splicing arrangement allows the provision of a long guide rail structure having an uninterrupted upper surface to allow smooth carriage movements; and a customized windshield washer assembly on the carriage allows effective washing of even the recessed windshields of large vehicles having long hoods.

Description:
RELATED APPLICATION  
       [0001]     This application is a divisional of U.S. application Ser. No. 10/828,088 filed under attorney docket no. BGR-135-A on Apr. 20, 2004, currently pending. The content of the U.S. patent Ser. No. 11/273,142 is incorporated herein by reference. 
     
    
     FIELD OF THE INVENTION  
       [0002]     This invention relates to car wash apparatuses, more particularly to car wash apparatuses of the rollover type, and yet more particularly to rollover car wash apparatuses especially suitable for use in washing large vehicles such as buses and trucks.  
       BACKGROUND OF THE INVENTION  
       [0003]     Car wash apparatuses are in common usage throughout the world for wet washing the exterior surfaces of various forms of automotive vehicles.  
         [0004]     One of the most popular forms of car wash apparatus is the so called “rollover” washer which is characterized by a washing structure which moves over or around a vehicle parked in a pre-specified wash area.  
         [0005]     In one particularly effective form of rollover car washer, a carriage moves over the vehicle along an overhead track structure and a pair of opposed nozzle spray arms pivotally mounted on the carriage act upon side and upper surfaces of the vehicle in response to linear movement of the carriage along the track structure and pivot in a butterfly fashion as the carrier reaches the respective ends of the vehicle to act upon the front and rear surfaces of the vehicle.  
         [0006]     Whereas this particular form of rollover car wash is effective in washing relatively small vehicles such as automobiles and small trucks, problems arise when this form of rollover washer is applied to the washing of large vehicles such as large buses and large trucks. Specifically, because of the necessarily long length of the washer commensurate with the long length of the vehicles being washed, problems arise in maintaining the washing water at a desirable hot temperature as the carriage carrying the spray arms moves to a position remote from the hot water source. Further, because the washer requires an excessively long track structure to allow the carriage to traverse the entire length of the large vehicles, problems arise with respect to physically constructing the long track structure without resort to bulky and expensive designs. Further, since the spray arms for washing the large vehicles are necessarily themselves quite large and therefore quite heavy, problems arise with respect to providing adequate bearing structure to support the pivoting movement of the spray arms. Further, again due to the long length of the washer structure, problems arise in the delivery of the necessary fluids and other supplies to the carriage as the carriage moves along its lengthy path. Further, since the washer must handle a variety of large vehicles including vehicles with windshields positioned remotely from the front end of the vehicle, problems arise with respect to providing effective cleaning of the windshield surface areas.  
       SUMMARY OF THE INVENTION  
       [0007]     The present invention provides a vehicle washer apparatus that is especially suitable for washing very large vehicles such as large trucks and large buses.  
         [0008]     According to an important feature of the invention, the wash system includes a source of hot water; a spray device for delivering water to the surface of a vehicle positioned in the vehicle wash area; a pump assembly having an input connected to the hot water source and an output; and control means operative to selectively connect the pump assembly output to the spray device or return the pump assembly output to the hot water source. This arrangement allows the water arriving at the spray device from the hot water source to be selectively recirculated to the hot water source until the temperature reaches a predetermined desired temperature.  
         [0009]     According to a further feature of the invention, the wash system further includes a conduit network interconnecting the hot water source and the pump assembly input, the pump assembly output and the spray device, and the pump assembly output and the hot water source; and the control means includes valve means in the conduit network between the pump assembly output and the spray device operative to selectively route the pump assembly output to the spray device or return the pump assembly output to the hot water source. This specific valving arrangement facilitates the recirculation of the water to the hot water source.  
         [0010]     According to a further feature of the invention, the control means is operative in response to the arrival of a vehicle at the vehicle wash area to actuate the pump assembly, signal the valve means in a sense to return the pump assembly output to the hot water source until the water reaches a predetermined temperature, and thereafter signal the valve means in a sense to route the pump assembly output to the spray device. This specific control arrangement insures that the water reaching the spray device is promptly heated to a desired temperature in response to the arrival of a vehicle in the wash area.  
         [0011]     According to a further feature of the invention, the pump assembly includes a variable speed pump and a variable speed drive means for the pump and the control means further includes means operative to energize the variable speed drive means in a sense to operate the pump at a relatively high speed when the pump output is being returned to the hot water source and energize the variable speed drive means in a sense to operate the pump at a relatively low speed when the pump output is being delivered to the spray device. The use of a variable speed pump allows the water to be rapidly recirculated and rapidly heated to the desired, predetermined temperature.  
         [0012]     According to a further feature of the invention, the hot water source includes a boiler and a storage tank receiving the output of the boiler, the pump assembly input is connected to the storage tank, and the pump assembly output is selectively returned to the storage tank. This arrangement allows the recirculation feature to be incorporated in a system including a standard boiler and storage tank arrangement.  
         [0013]     According to a further feature of the invention, the system includes a rail structure and a carriage mounted on the rail structure for reciprocal movement over the vehicle wash area and the spray device and the valve means are carried by the carriage. This specific arrangement allows the careful and selective control of the temperature of the water arriving at the spray device.  
         [0014]     The invention further provides a method of maintaining a supply of hot water at a predetermined temperature at a spray device of a vehicle wash system of the type including a fixed source of hot water and conduit means interconnecting the spray device and the hot water source. According to the invention method, a valve mechanism is provided in the conduit means; the arrival of a vehicle at a wash area of the wash system is sensed; water arriving at the valve mechanism from the hot water source is routed back to the hot water source until the water arriving at the valve mechanism has achieved the predetermined temperature; and water thereafter arriving at the valve mechanism is routed to the spray device for application at the predetermined temperature to the vehicle. This methodology allows the hot water to be maintained at a predetermined temperature even in large wash systems where the conduit means interconnecting the spray device and the hot water source is of necessity quite long.  
         [0015]     The invention further provides a frame structure for supporting a carriage for reciprocal movement over a vehicle wash area. According to the invention, the frame structure comprises a plurality of gantries positioned at longitudinally spaced locations over the vehicle wash area and each including vertical members upstanding from the floor surface and an upper cross member interconnecting upper ends of the vertical members; and a pair of parallel carriage guide rails mounted on the gantries in a position passing beneath the upper cross member of one of the gantries by a distance sufficient to allow a carriage moving along the guide rails to pass beneath the upper member of the one gantry. This arrangement facilitates the provision of a long uninterrupted track surface to facilitate the movement of a carriage from front to rear of a large vehicle positioned in the vehicle wash area.  
         [0016]     According to a further feature of the invention, the guide rails are mounted on the one gantry by a pair of connector frame members each including a horizontal leg extending inboard for a connection to a respective one of the guide rails. This specific arrangement further facilitates the provision of an uninterrupted track surface.  
         [0017]     According to a further feature of the invention, each connector frame member has an L-configuration and further includes a vertical leg connected to and extending downwardly from the upper cross member of the one gantry and the vertical leg of each connector frame member is mounted on the upper cross member for laterally adjustable movement. This specific arrangement allows the ready adjustment of the lateral position of the guide rails to match the track of the carriage.  
         [0018]     According to a further feature of the invention, each guide rail includes a first longitudinal section and a second longitudinal section having an end butted against an end of first section to form a splice joint; and the horizontal leg of each connector frame member is connected to the respective guide rail at the splice joint. This specific support arrangement further facilitates the provision of an uninterrupted guide rail surface.  
         [0019]     According to a further feature of the invention, each guide rail has a hollow aspect; the inboard end of each horizontal leg is butted against an outboard face of the respective guide rail proximate the splice joint; coacting wedge members are positioned in the hollow aspect of each guide rail proximate the splice joint; and the coacting wedge members are relatively moveable by rotation of a threaded fastener member carried by the inboard end of the horizontal leg of the respective connector frame member. This specific wedge arrangement allows the longitudinal guide rail sections to be spliced together in a manner that does not interrupt the upper surface of the guide rail assembly.  
         [0020]     According to a further feature of the invention, each wedge member is elongated and includes a first portion positioned in the first longitudinal section of the respective guide rail and a second portion positioned in the second longitudinal section of the respective guide rail. This arrangement further facilitates the splicing together of the guide rail sections while maintaining an uninterrupted upper guide rail surface.  
         [0021]     According to a further feature of the invention, there are three wedge members positioned in each guide rail including an upper member positioned against an upper face of the respective guide rail, a lower member positioned against a lower face of the respective guide rail, and a central member positioned between the upper and lower members and having upper and lower wedge faces wedgingly coacting respectively with a lower wedge face of the upper member and an upper wedge face of the lower member. This specific wedge member arrangement further facilitates the splicing together of the longitudinal sections of the guide rails.  
         [0022]     The invention further provides a washer system wherein hot water is effectively delivered to the carriage even as the carriage moves over large distances extending from the front to rear ends of large vehicles positioned in the wash area. The wash system according to this aspect of the invention includes a fixed source of hot water removed from the wash area; a rail structure extending over the wash area; a carriage mounted for reciprocal movement on the rail structure over the wash area between a forward position and a rearward position; a spray device carried by the carriage; an elongated flexible carrier member having a rearward end fixed to a point on the rail structure and a forward end connected to the carriage and assuming a folded configuration during at least a portion of the movement of the carriage along the rail structure; and a water conduit extending from the hot water source to the rail structure point and thereafter threaded through the carrier to the carriage for connection to the spray device. This arrangement allows hot water to be effectively delivered to the spray device even as the carriage moves from front to rear of a large vehicle positioned in the wash area.  
         [0023]     According to a further feature of the invention, the rail structure includes a trough extending along the rail structure and the carrier is positioned in the trough and folds and unfolds in the trough during the movement of the carriage along the rail structure. This specific arrangement facilitates the folding and unfolding of the carrier.  
         [0024]     According to a further feature of the invention, the carrier has a chain configuration including a plurality of pivotally interconnected links. This specific construction facilitates the folding and unfolding of the carrier.  
         [0025]     According to a further feature of the invention, a plurality of conduits are threaded through the carrier for delivering various ingredients or energies to the carriage for use in washing a vehicle positioned in the wash area. This arrangement allows all of the necessary ingredients required at the carriage to be effectively delivered to the carriage even as the carriage moves over the lengthy path required to wash the entirety of a large vehicle positioned in the wash area.  
         [0026]     The invention further provides improved bearing structure for supporting the nozzle spray arm of a rollover type washer. This aspect of the invention is applicable to a wash system including a rail structure extending over the wash area, a carriage mounted for reciprocal movement along the rail structure, and a spray arm pivotally mounted on the carrier and including a pivot structure at an inboard end thereof journaled in a bearing structure carried by the carriage, and at least one spray device mounted on the arm for directing washer fluid against a vehicle positioned in the wash area. According to this aspect of the invention, the bearing structure includes an upper bearing journaling an upper portion of the pivot structure and a lower bearing journaling a lower portion of the pivot structure. This specific arrangement allows the provision of adequate bearing support for even the very large nozzle arms required to wash large vehicles.  
         [0027]     According to a further feature of the invention, the carriage includes a frame structure; the upper bearing is mounted on the carriage frame structure; and the lower bearing is mounted on a support plate suspended beneath the carriage frame structure. This arrangement provides a ready and convenient means of providing the upper and lower bearing support for the pivot structure of the nozzle arm.  
         [0028]     According to a further feature of the invention, the wash system further includes a second arm, pivotally mounted on the carriage and including a pivot structure at its inboard end and a spray device mounted on the second arm and the second arm includes a bearing structure including an upper bearing mounted on the carriage frame structure and journaling an upper portion of the pivot structure of the second arm and a lower bearing mounted on the support plate and journaling a lower portion of the pivot structure of the second arm. This arrangement allows the upper and lower bearing structure to accommodate the pivot structure of both arms of a butterfly type washer.  
         [0029]     The invention further provides an arrangement to facilitate the washing of large vehicles having recessed windshields. This aspect of the invention relates to a wash system of the type including a rail structure extending over the wash area, a carriage mounted for reciprocal movement along the rail structure between a forward position and a rearward position, an arm pivotally mounted on the carriage, and at least one spray device mounted on the arm for directing washing fluids against a vehicle positioned in the wash area. According to this aspect of the invention, the wash system further includes a further spray device in the form of a nozzle carried by the carriage and operative to direct fluid downwardly and rearwardly against the windshield of a vehicle positioned in the wash area. This arrangement allows even a recessed windshield to be effectively cleaned.  
         [0030]     According to a further feature of the invention there are a plurality of further spray devices in the form of a plurality of laterally spaced nozzles mounted on the carriage and operative to direct a plurality of fluid streams downwardly and rearwardly against laterally spaced locations on the vehicle windshield. This arrangement insures that the entire lateral expanse of the recessed windshield will be effectively cleaned.  
         [0031]     Other applications of the present invention will become apparent to those skilled in the art when the following description of the best mode contemplated for practicing the invention is read in conjunction with the accompanying drawing. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0032]     The description herein makes reference to the accompanying drawings wherein like reference numerals refer to like parts throughout the several views, and wherein:  
         [0033]      FIG. 1  is a perspective schematic view showing the installation of the invention washer in a typical structure;  
         [0034]      FIG. 2  is a perspective fragmentary view showing a frame structure and a carriage supported by the frame structure;  
         [0035]      FIGS. 3, 4 ,  5 ,  6  and  7  are detail views showing the manner in which rail sections of the frame structure are joined together;  
         [0036]      FIG. 8  is an exploded view of a bearing structure utilized to support spray arms of the washer;  
         [0037]      FIG. 9  is a detail view of a support plate utilized in the bearing structure;  
         [0038]      FIG. 10  is a cross sectional view showing the bearing structure;  
         [0039]      FIG. 11  is a schematic view illustrating the manner in which various energies are transported from the equipment room to the carriage of the washer;  
         [0040]      FIG. 12  is a fragmentary perspective view showing further details of the manner in which the various energies are delivered to the carriage;  
         [0041]      FIG. 13  is a somewhat schematic plan view further illustrating the delivery of the various energies to the carriage;  
         [0042]      FIGS. 14 and 15  are detail views illustrating a windshield washer arrangement carried by the carriage; and  
         [0043]      FIGS. 17, 18 ,  19 ,  20  and  21  illustrate a flexible carrier utilized in the routing of the various energies from the equipment room to the carriage. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT  
       [0044]     The rollover washer of the invention is typically installed in a building structure  10  and, broadly considered, includes a frame structure  12 , a carriage assembly  14 , an equipment room assembly  16 , and a supply assembly  18 .  
         [0045]     Building structure  10  ( FIG. 1 ) typically includes an equipment room  20  and a wash bay  22  positioned parallel to the equipment room and separated from the equipment room by a partition wall  24 . The wash bay  22 , may for example, have a length between 45′ and 75′ whereby to accommodate even very large vehicles such as eighteen wheel tractor-trailer type trucks.  
         [0046]     Frame structure  12  ( FIGS. 2, 3  and  12 ) is of the gantry type and includes an entry gantry  26 , an exit gantry  28 , and a center gantry  30 .  
         [0047]     Entry gantry  26  includes a pair of laterally spaced vertical post members  26   a  upstanding from the floor surface of the wash area and an upper cross member  26   b  interconnecting upper ends of the vertical post members.  
         [0048]     Exit gantry  28  includes a pair of laterally spaced vertical post members  28   a  upstanding from the floor surface of the wash area and an upper cross member  28   b  interconnecting the upper ends of the vertical post members.  
         [0049]     Center gantry  30  includes a pair of laterally spaced vertical post members  30   a  upstanding from the floor surface of the wash area and an upper cross member  30   b  interconnecting upper ends of the vertical post members.  
         [0050]     Post members  30   a  are significantly higher than post members  26   a,    28   a  so that cross member  30   b  is positioned significantly above cross members  26   b,    28   b.    
         [0051]     Frame structure  12  further includes a pair of parallel carriage guide rails  32 ,  34  mounted on the gantries in a position passing beneath the upper cross member  30   b  of the middle gantry. Each guide rail is a composite structure comprising rail sections arranged end to end in butting engagement. Specifically, rail  32  comprises a first longitudinal section  32   a  and a second longitudinal section  32   b  and rail  34  comprises a first longitudinal section  34   a  and a second longitudinal section  34   b.  The forward end  32   c  of section  32   a  is butted to cross member  28   b;  the rear end  32   d  of member  32   a  is butted against the front end  32   c  of member  32   b;  and the rear end  32   f  of member  32   b  is butted to cross member  26   b.  The front end  34   c  of member  34   a  is butted to cross member  28   b;  the rear end  34   d  of member  34   a  is butted to the front end  34   e  of member  34   b,  and the rear end  34   f  of member  34   b  is butted to cross member  26   b.    
         [0052]     The frame structure further includes a pair of L-shaped connector members  36  ( FIGS. 3, 5 ,  6  and  7 ) each including a vertical member  36   a  and a horizontal member  36   b  and a plate  36   c  secured to the free inboard end of the horizontal member. Each connector member  36  is mounted for lateral adjusting movement along the upper cross member  30   b  via a suitable clamp assembly  38   a / 38   b.  Plate  36   c  of each connector member coacts with a wedge assembly  40  ( FIG. 4 ) to maintain end  32   d  of member  32   a  in butting engagement with end  32   e  of member  32   b  while providing an uninterrupted horizontal upper surface for the rail assembly.  
         [0053]     Each wedge assembly  40  includes an upper wedge member  42 , a lower wedge member  44 , and a central wedge member  46 . Central wedge member  46  includes an upper wedge face  46   a  for wedging coaction with a lower wedge face  42   a  on upper member  42  and a lower wedge face  46   b  for wedging coaction with an upper wedge face  44   a  on lower member  44 .  
         [0054]     To assembly a respective connector member  36  to a respective rail assembly proximate the splice joint, the respective plate  36   c  is positioned against the outboard face of the rail member proximate the splice joint; one end portion of members  42 ,  44  and  46  is inserted into the open end of rail end  32   c  with wedge faces  46   a  and  42   a  in wedging coaction and wedge faces  46   b  and  44   a  in wedging coaction; bolts  48  are passed through apertures in the respective plate  36   c  and through aligned apertures in the outer wall of the rail end  32   e  for threaded engagement with threaded bores in the respective wedge members; the bolts are tightened to move the wedge members into wedging coaction and to specifically press the upper face  42   b  of the upper wedge member against an upper face  32   c  of the rail and press the lower face  44   b  of the lower wedge member against a lower face  32   h  of the rail; the end  32   d  of the rail  32   a  is slipped over the projecting end portions of the wedge members and into abutting engagement with the end  32   c  of rail  32   b;  further bolts  48  are passed through apertures in the respective plate  36   c  and through aligned apertures in the outer wall of end  32   d  for threaded engagement with threaded bores in the wedge members  42 ,  44  and  46 ; and the further bolts  40   a  are tightened to lock the wedge members into engagement with the end  32   d  and fixedly splice the end  32   d  to the end  32   c  with a smooth, uninterrupted upper surface of the rail assembly. If desired, each spliced joint may now be welded along the respective edges of the joint whereafter any weld splatter and excess may be ground off to insure a smooth, uninterrupted upper surface of the rail assembly.  
         [0055]     Note that vertical connector members  36   a  have a length sufficient to position the rail structures  32 ,  34  sufficiently below the cross member  30   b  to allow a carriage  14  traveling along the rail structure to pass freely beneath the cross member  30   b.    
         [0056]     Frame structure  12  further includes a trough structure  50  ( FIGS. 12, 17 ,  18  and  19 ) positioned along the outboard face of guide rail assembly  34 . Trough  50  is constituted by a plurality of longitudinally spaced support bars  51  suitably and fixedly secured to the outboard face of the rail assembly  34  and a pair of L-shaped side plates  52  fixedly secured to the upper face of the support rods. Trough  50  may be provided in sections and may for example include a rear section positioned outboard of rail member  34   b  and a front section positioned outboard of rail member  34   a  with the inboard ends of the respective troughs positioned proximate opposite faces of the horizontal member  36   b  of the connector member  36  supporting the rail  34 .  
         [0057]     Carriage assembly  14  ( FIGS. 8, 9 ,  10 ,  12  and  13 ) has a generally rectangular box configuration and includes side walls  14   a,  front wall  14   b,  rear wall  14   c,  upper longitudinally spaced wheels  53  mounted on side walls  14   a  and rollably guiding on the upper face of the guide rails  32 ,  34 , lower tires  54  mounted on side walls  14   a  and rollably engaging the underface of the guide rails, a pair of nozzle spray arms  56  each having a pivot plate  56   a  ( FIG. 8 ) at its inboard end, a windshield washer spray assembly  57 , and a bearing structure  58  mounting the inboard ends of the nozzle spray arms for pivotal movement in butterfly fashion. A gearbox  60  driven by an electric motor  62  drives an axle  64  which drivingly engages the tires  54  whereby to propel the carriage along the guide rails in response to actuation of the motor.  
         [0058]     Each spray arm  56  has an L-configuration and includes a horizontal portion  56   b,  defining laterally spaced downwardly directed nozzles  56   c,  and a vertical portion  56   d,  defining vertically spaced inwardly directed nozzles  56   e.    
         [0059]     Windshield washer spray assembly  57  ( FIGS. 12, 13 ,  14  and  15 ) includes a manifold tube  57   a  fixedly clamped to the inboard rear face of carriage front wall  14   b  and defining an inlet  57   b  and a plurality of laterally spaced downwardly and rearwardly directed nozzles  57   c.    
         [0060]     Bearing structure  58  ( FIGS. 8, 9 , and  10 ) includes an upper support plate  66 , a lower support plate  68 , meshing gears  70  and  72 , upper bearing structures  74 , lower bearing structures  76 , upper pivot structures  78 , and lower pivot structures  80 . In assembled relation, upper support plate  66  is supported on and extends between front and rear angle iron carriage supports  81 , the upper bearing structures  74  are secured to the underface of upper support plate  66  with the bearings  74   a  positioned in laterally spaced apertures  66   a  in the support plate; upper pivot structures  78  are journaled in bearings  74   a;  gears  70 ,  72  are sandwiched between pivot structures  76  and pivot structures  78  with nozzle arm pivot structure  56   a  interposed between the lower face of the gears and the upper face of pivot structures  78 ; bearing structures  76  are fixedly secured to the upper face of lower support plate  68  with the bearings  76   a  received in laterally spaced apertures  68   a  in the support plate; pivot structures  80  are journaled in bearings  76   a;  posts  82  and pillars  84  fixedly interconnect the upper and lower support plates; and bolts  86  pass through aligned apertures in pivot structure  78 , gears  70 ,  72 , pivot plates  56   a,  and pivot structures  80  to maintain the various elements of the pivot structure in the sandwich configuration best seen in  FIG. 10  wherein the upper pivot structures are journaled in the upper bearings received in the upper support plate and the lower pivot structures are journaled in the lower bearings received in the lower support plate whereby to provide a firm, large area, long axis journal surface for the heavy nozzle arms as they undergo their pivoting butterfly movement to effect cleansing of the front and rear ends of the vehicle.  
         [0061]     The pivotal movement of the nozzle arms is achieved ( FIGS. 10, 12  and  13 ) by an electric motor  88  mounted on support plate  66  and driving an upward extension of the pivot structure  78  secured to gear  72  via a gearbox  80  also carried on the support plate  66  whereby actuation of motor  88  drives gear  72  and thereby meshing gear  70  whereby to move the nozzle arms through a “butterfly” or “clap hands” motion.  
         [0062]     Equipment room assembly  16  ( FIGS. 1, 2  and  11 ) includes a boiler  100 , a hot water storage tank  102 , a pump  104  driven by a variable speed motor  106  and a controller  108 .  
         [0063]     Boiler  100  functions in known manner to heat water received from a water supply for delivery to storage tank  102  where the hot water is stored until a demand is made upon the hot water. The output of the storage tank connects to the input of pump  104 .  
         [0064]     Supply assembly  18  is designed to provide a supply of hot water, electricity and other needs from the equipment room to the carriage as the carriage moves along the guide rails between the front and rear ends of large vehicles positioned in the wash bay.  
         [0065]     Supply assembly  18  includes a bulkhead  110 , a flexible carrier  112 , a valve assembly  113 , and a utility bundle  114 .  
         [0066]     Bulkhead  110  ( FIG. 17  and  18 ) has a skeletal configuration and includes a flange portion  110   a  fixedly secured to the under face of the cross member  36   b  associated with rails  34   a,    34   b;  a horizontal main body portion  110   b  defining a window  110   c,  and a vertical connector portion  110   d  defining a window  110   e  and a plurality of utility apertures  110   f  of varying sizes adapted to accommodate various utility corrections.  
         [0067]     Flexible carrier  112  ( FIGS. 12, 17 ,  18  and  20 ) has a chain configuration and includes a fixed end  115 , a free end  116 , and a plurality of intermediate links  118 .  
         [0068]     Fixed end  115  has a clevis configuration and is fixedly secured to the upper face of the horizontal connector member  36   b  mounting bulkhead  110 .  
         [0069]     Free end  116  has a chain link configuration and is pivotally secured to a pair of laterally spaced lugs  120   a  upstanding from a mounting plate  120  fixedly secured to an upper edge of the carriage and extending in cantilever fashion outwardly over the trough  50 .  
         [0070]     Links  118  are positioned in chain fashion in trough  50  and specifically extend rearwardly in trough  50  from fixed end  115  and thereafter fold back upon themselves and extend forwardly in folded fashion for connection to plate  120  via free end  116 . Each link has a cage configuration and includes oval side plates  118   a  interconnected by spaced upper and lower cross bars  118   b.  The links are pivotally secured together by pivot pins  118   c.    
         [0071]     Valve assembly  113  is positioned on support plate  66  and includes solenoid valves  122  and  124 .  
         [0072]     Utility bundle  114  is intended to provide the various energy needs of the carriage as the carriage moves along the rail structure during the course of washing a vehicle positioned in the wash bay. Utility bundle  114  in known manner may include various conduits for conducting water, chemicals, solvents, air and electricity to the carriage for use by the various corresponding devices on the carriage. Bundle  114  extends from utility room  20  through partition  24  and into the wash bay through the bulkhead  110  where the various conduits separate from the bundle and pass individually through the various apertures  110   f  in the bulkhead depending upon the size of the conduits, whereafter the conduits pass upwardly through window  110   c  and pass into the flexible carrier and specifically pass successively through each successive chain link  118  until they exit the flexible carrier at the free end  116  for routing to the suitable device on the carriage.  
         [0073]     Specifically, a hot water hose  130  from the pump outlet  108   a  is routed via bundle  114  to valve assembly  113  whereat, depending upon the positioning of solenoid valves  122 ,  124 , it may either be routed by a hose  132  to the spray nozzles on the horizontal and vertical arm portions of the nozzle carrier arms  56  or it may be returned via bundle  114  by a hose  134  to hot water storage tank  102  with the controller  108 , based on a signal from a temperature sensor  136  sensing the temperature of the water arriving in the hose  130  at the valve assembly, functioning to either return the arriving water to the hot water tank or deliver the water to the nozzle spray arms depending upon whether the water arriving at the valve assembly, as determined by the temperature sensor, has reached a predetermined desired temperature suitable for the washing action. Controller  108  further functions to vary the speed of variable speed motor  106 , and thereby the output of pump  104 , depending on whether the pump output is being returned to the hot water source or is being delivered to the spray nozzles. Specifically, the controller may function to pump water at a relatively high rate (for example 10 g.p.m.) when the water is being recirculated back to the hot water tank and pump water at a relatively slow rate (for example 5 g.p.m.) when the water is being delivered to the nozzle spray arms. A further hose  140  arriving through the flexible carrier at the carriage may be routed to the windshield washer manifold  57  and various electrical wires arriving at the carriage through the flexible carrier may be routed respectively to the solenoid valve  122 , the solenoid valve  124 , the temperature sensor  136 , the motor  88 , and the motor  62  whereby to selectively control the various devices carried by the carriage. Note ( FIG. 18 ) that a window  50   a  is provided in the floor of the trough segment proximate the front face of cross member  36   a  whereby to allow the various conduits to pass upwardly from the bulkhead and into the flexible carrier.  
         [0074]     Note that the described flexible carrier arrangement allows the carriage to move the full length of the guide rail, whereby to achieve a complete washing of even an extremely long vehicle positioned in the wash area, without entangling or ensnarling any of the conduits. The flexible carrier  112  may for example be of the type know as a “Cat Trac” available from GorTrac of New Berlin, Wis., as Model Number K63-14.  
         [0075]     With the carriage in a central or “home” position on the rails and the spray arms extending laterally outwardly from the carriage, a vehicle may enter the wash area  22   a  and proceed to the forward end of the wash area where the arrival of the vehicle in the wash area may be signaled, for example, by a front tire of the vehicle depressing a treadle  142  to signal the controller that a vehicle is ready for a wash cycle. The controller thereupon signals the pump  104  to begin delivering hot water through the conduit  130  to the valve assembly  113 . Depending upon the temperature of the water arriving at the valve assembly  113 , as sensed by the temperature sensor  136 , the water will either be routed back to the storage tank via conduit  134  for further reheating or it may be routed directly to the spray arms  56 . Typically, especially after a long shut down period, the water initially arriving at the valve assembly  113  will be below the predetermined temperature as determined by the sensor  136  and after appropriate opening and closing of the valves  122  and  124 , will be routed back to the hot water storage tank for further heating. Once the temperature of the water arriving at the valve assembly, as sensed by the sensor  136 , has reached the predetermined temperature, valve  124  is closed and valve  122  is opened so that the water arriving at the valve assembly is directed to the spray arms  56  for application to the vehicle via the downwardly directed nozzles  56   c  and the inwardly directed nozzles  56   e.  At this time the controller functions to signal the motor  62  to drive the tires  54  and move the carriage forwardly along the rail assembly with the nozzles  56   c  and  56   e  operating during this forward movement to wet the upper and side regions of the vehicle. As the carriage reaches the front end of the vehicle, as sensed by appropriate sensor mechanisms, the carriage is halted and the motor  88  is actuated to move the arms  56  in butterfly fashion around the front of the vehicle until the arms move into juxtaposition, whereafter the arms reverse their butterfly movement and return to the outwardly splayed position whereafter the carriage is moved rearwardly along the guiderails to the rear of the vehicle whereafter the butterfly movement is repeated in reverse fashion to wash the rear end of the vehicle whereafter the arms are returning to their outwardly splayed position and the carriage returned to its home position. This procedure will of course be repeated many times for a typical washing cycle to accomplish wetting, washing, chemical application and other processes related to the required washing operation.  
         [0076]     If the vehicle being washed is a vehicle with a recessed windshield, such for example as the bus seen in  FIG. 16 , the carriage may be halted in a position immediately forwardly of the windshield whereupon the windshield spray assembly  57  may be utilized to direct fluids downwardly and rearwardly against the windshield to thoroughly cleanse the windshield with the laterally spaced nozzles  57   c  operating to insure that the entire lateral expanse of the windshield is thoroughly cleaned.  
         [0077]     The vehicle washer of the invention will be seen to successfully address many of the problems that are unique to a vehicle washer specifically designed to wash large vehicles such as large trucks and large buses.  
         [0078]     Specifically, the invention provides a rollover washer wherein the water arriving at the carriage for distribution to the spray device is assured to be at a predetermined hot temperature irrespective of the length of the water conduit interconnecting the carriage and the hot water source. The invention further provides a system whereby the carriage may move over even very large vehicles from front to rear of the vehicle with assurance that all of the various conduits extending from the equipment room to the carriage will remain unsnarled and viable. Further, the invention washer provides adequate bearing support for the very large nozzle spray arms required to achieve washing of the large vehicles. Further, the invention provides a structure whereby an extremely long guide rail may be provided for the carriage utilizing relatively short sections while eliminating any interruption in the upper surface in the rail sections at the splice joints. Further, the invention washer insures that even recessed windshields on relatively large vehicles will be adequately cleansed.  
         [0079]     While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiments but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims, which scope is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures as is permitted under the law. For example, although the guide rails are illustrated and described as being formed from two rail sections butted together, it will be apparent that further rail sections could be employed to provide a greater length wash apparatus.