Abstract:
A unique attachment mechanism whereby a trash can dolly can be affixed to the underside of a mop bucket by an interconnection mechanism by a simple rolling motion so that it is not necessary to lift a heavy mop bucket filled with water to interconnect the mop bucket and the trash can dolly.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to the field of janitorial supplies and in particular to a rolling dolly on which a trash can is retained and to a rolling mop bucket which retains water and cleaning solution so that a mop is placed into the bucket and the water and cleaning solution are absorbed onto the mop strands which is then used to clean a floor. 
     2. Description of the Prior Art 
     In general, rolling dollies on which a trash can is retained are known in the prior art. Rolling mop buckets are also known in the prior. When a janitor uses both, the janitor must separately roll the mop bucket to the location where cleaning is to be performed and separately roll the trash can dolly to the location where cleaning is to be performed. 
     There is a significant need to provide a mechanism wherein the trash can dolly and mop bucket can be efficiently linked together so that both can be simultaneously rolled to a location where cleaning is to be performed. 
     SUMMARY OF THE INVENTION 
     The present invention is a unique attachment mechanism whereby a trash can dolly can be affixed to the underside of a mop bucket by an interconnection mechanism by a simple rolling motion so that it is not necessary to lift a heavy mop bucket filled with water to interconnect the mop bucket and the trash can dolly. 
     A problem with prior art designs is that there is a method for interconnecting the trash can dolly and the mop bucket but this requires that the mop bucket be lifted to be inserted over the interconnecting member from the trash can dolly. After the mop bucket is filled with water and cleaning fluids and has the wringer on it, it is a heavy object and therefore, would provide stress on the janitor to lift the mop bucket over the interconnecting member with the trash can dolly. 
     It is an object of the present invention to provide an interconnecting mechanism which can be lowered by an activation means such as a foot depressing on the interconnecting member so that the interconnecting member can be placed into a position beneath the mop bucket and when the force on the activation means is released, then mechanisms on the interconnecting member can be affixed to a portion of the mop bucket so that the trash can dolly and the mop bucket are retained together. 
     It is a further object of the present invention to provide an interconnecting member having a ramp section with a downwardly extending inclined angle so that the ability of the ramp section to be pushed under the mop bucket is facilitated by the downwardly extending angle extending downwardly from the trash can dolly to the mop bucket. 
     It is a further object of the present invention to provide an interconnecting member having a return force means such as return springs which enable the interconnecting ramp to be in line with the trash can dolly and enable an activation force to overcome the force of interconnecting springs so that the ramp section is lowered to be placed into a location under the mop bucket and when the activation force is released, the return force causes the ramp section to be engaged with at least one portion of the mop bucket so that the trash can dolly and the mop bucket are retained together by a simple rolling motion of the trash can dolly relative to the mop bucket and without requiring that the mop bucket be lifted to the interconnecting member. 
     It is also an object of the present invention to provide retaining means on the mop bucket which includes at least one downwardly extending sidewall and preferably a front base wall, a rear base wall, a first sidewall and a second sidewall which can be respectively engaged by the ramp section of the interconnecting member. 
     It is also an object of the present invention to provide a transverse slot in the ramp section of the interconnecting member which has a given height and thickness sufficient to engage and retain a selective one of the mop bucket engaging members which include a front base wall, a rear base wall, a first sidewall and a second sidewall. 
     When the ramp of the interconnecting member from the trash can dolly is engaged with the mop bucket, the distance of movement from left to right on the front of the dolly or the back of the dolly is small enough that there probably will not be movement of the trash can dolly relative to the mop bucket. However, on the sidewalls, there is a sufficient distance so that even if engaged with a transverse slot engaging a first downward sidewall or second downward sidewall, the trash can dolly can move relative to the mop bucket in a side to side motion. 
     Therefore, an additional object of the present invention is to provide a retaining rib which extends transversely from the front base wall, the rear base wall and both of the sidewalls in a direction toward the center of the base for a given length so that the ramp section, in addition to having the transverse groove, also has a longitudinal groove which concurrently engages the selected retaining rib. Therefore, by engagement of the retaining rib in the longitudinal member, the trash can dolly is prevented from moving side to side as well as being retained by the transverse rib. Accordingly, through use of the present invention, the trash can dolly can be retained underneath the front, the back or either side of the mop bucket by engagement of a transverse rib engaging and retaining one of the sidewalls or front or rear wall of the mop bucket and the longitudinal rib engaging the retaining rib which extends transversely from the front wall, back wall and sidewalls so that the trash can dolly is securely retained with the mop bucket and both mop bucket and trash can dolly can be rolled to any convenient cleaning location without requiring the janitor to lift the heavy mop bucket to cause an engagement with the trash can dolly. 
     It is a further object of the present invention to provide a means for quickly and efficiently engaging a trash can dolly with a mop bucket without requiring the lifting of either the trash can dolly or the mop bucket to facilitate the engagement. 
     It is a further object of the present invention to provide a combination trash can dolly and mop bucket wherein the trash can dolly can be engaged at any desired location on the mop bucket in the front of the mop bucket, in the rear of the mop bucket or on either side of the mop bucket and the trash can dolly and the mop bucket can be rolled to a convenient location where the mop bucket is already filled with cleaning liquid and water and the trash can dolly is retaining a trash can thereon. 
     While in the preferred embodiment, the length of the respective retaining ribs are the same, it is within the spirit and scope of the present invention for each retaining rib extending from the front base wall, the rear base wall and either of the two sidewalls to be of different heights and lengths. However, a key innovation is that the engaging member on the trash can dolly must be of sufficient height and length to engage the retaining rib. Accordingly, in the preferred embodiment, the retaining ribs are all of the same thickness and height so that they can each individually be separately retained for engagement with the longitudinal channel set within the ramp section on the trash can dolly. 
     In addition, it is preferred that the thickness and height of the front base wall, rear base wall and both sidewalls of the trash can dolly be the same so that each one can be selectively retained within a transverse channel in the ramp section of the trash can dolly so that a janitor can select any desired side of the mop bucket to be retained by the trash can dolly so the two can be conveniently rolled to a cleaning location. 
     The present invention is an apparatus for engaging a trash can dolly with a mop bucket comprising: (a) the trash can dolly including a body with an upper surface with means to retain a trash can thereon, a lower surface with means to retain a multiplicity of spaced apart rolling wheels to enable the trash can dolly to be rolled from one location to another; (b) the mop bucket having upper sidewalls surrounding an upper surface of a base to form a chamber for retaining liquid, the base having means to retain a multiplicity of spaced apart rolling wheels to enable the mop bucket to be rolled from one location to another; (c) the base of the mop bucket having a lower surface having a front base wall of a given first height and a given first thickness, a first retaining rib extending transversely from an interior wall of the front base wall for a given second distance toward a center of the mop bucket with the first retaining rib having a given second thickness, a rear base wall of the given first height and the given first thickness, a second retaining rib extending transversely from an interior wall of the rear base wall for the given second distance toward a center of the mop bucket with the second retaining rib having the given second thickness, a first sidewall of the given first height and the given first thickness, a first side retaining rib extending transversely from an interior wall of the first sidewall for the given second distance toward a center of the mop bucket with the first side retaining rib having the given second thickness, a second sidewall of the given first height and the given first thickness, a second side retaining rib extending transversely from an interior wall of the second sidewall for the given second distance toward a center of the mop bucket with the second side retaining rib having the given second thickness, the front base wall, rear base wall, first sidewall and second sidewall all aligned and all extending in a direction away from the lower surface of the base and in a direction away from the liquid retaining chamber; (d) the trash can dolly having an interconnecting section including a fixed section affixed to the body of the trash can dolly and having a top surface aligned with the top surface of the body of the trash can dolly, the interconnecting section having a movable section rotatably affixed adjacent one end to the fixed section, the interconnecting section having a protruding ramp section at a location remote from where the movable section is rotatably affixed, the protruding section having an inclined top surface extending at a downward angle away from and relative to the top surface of the fixed section, the ramp section having a longitudinal centrally disposed channel having a sufficient depth and width to receive and retain any one of the retaining ribs of the mop bucket and a transverse channel of sufficient depth and width to receive and retain any one of the front base wall, rear base wall, first sidewall and second sidewall of the mop bucket, the movable second section having at least one return spring to provide a force to retain the movable section against the fixed section, a relative rolling motion of the trash can dolly and the mop bucket enables the ramp section to come in contact with at least one retaining rib so that a force of at least one retaining rib against the ramp section overcomes the force of the at least one return spring and causes the moveable section to rotate so that the ramp section is rotated to a location below the mop bucket so that after the ramp section is moved to a location further under the mop bucket than a given length of the at least one retaining rib, the force of the at least one retaining rib against the ramp section is released and the force of the at least one return spring returns the moveable section to its original location and the at least one retaining rib is engaged within and retained in the longitudinal centrally disposed channel of the ramp section and at least one of the front base wall, rear base wall, first sidewall and second sidewall is engaged within and retained in the transverse channel. 
     The present invention is also an apparatus for engaging a trash can dolly with a mop bucket comprising: (a) the trash can dolly including a body with an upper surface with means to retain a trash can thereon, a lower surface with means to retain a multiplicity of spaced apart rolling wheels to enable the trash can dolly to be rolled from one location to another; (b) the mop bucket having upper sidewalls surrounding an upper surface of a base to form a chamber for retaining liquid, the base having means to retain a multiplicity of spaced apart rolling wheels to enable the mop bucket to be rolled from one location to another; (c) the base of the mop bucket having a lower surface having at least one base wall and a retaining rib selected from the group consisting of a front base wall, of a given height and a given thickness with a first retaining rib extending transversely from an interior wall of the front base wall for a given distance toward a center of the mop bucket with the first retaining rib having a given thickness, a rear base wall of a given height and a given thickness and a second retaining rib extending transversely from an interior wall of the rear base wall for a given distance toward a center of the mop bucket with the second retaining rib having a given thickness, a first sidewall of a given height and a given thickness with a first side retaining rib extending transversely from an interior wall of the first sidewall for a given distance toward a center of the mop bucket with the first side retaining rib having a given thickness, a second sidewall of a given height and a given thickness with a second side retaining rib extending transversely from an interior wall of the second sidewall for a given distance toward a center of the mop bucket with the second side retaining rib having a given second thickness, the front base wall, rear base wall, first sidewall and second sidewall all aligned and all extending in a direction away from the lower surface of the base and in a direction away from the liquid retaining chamber; (d) the trash can dolly having an interconnecting section including a fixed section affixed to the body of the trash can dolly and having a top surface, the interconnecting section having a movable section rotatably affixed to the fixed section, the interconnecting section having a protruding ramp section at a location remote from where the movable section is rotatably affixed and a longitudinal channel having a sufficient depth and width to receive and retain any one of the retaining ribs of the mop bucket and a transverse channel of sufficient depth and width to receive and retain any one of the front base wall, rear base wall, first sidewall and second sidewall of the mop bucket, the movable second section having return means to provide a force to retain the movable section against the fixed section, a relative rolling motion of the trash can dolly and the mop bucket enables the ramp section to come in contact with at least one retaining rib so that a force of at least one retaining rib against the ramp section overcomes the force of the return means and causes the moveable section to rotate so that the ramp section is rotated to a location below the mop bucket so that after the ramp section is moved to a location further under the mop bucket than a given length of the at least one retaining rib, the force of the at least one retaining rib against the ramp section is released and the force of the return means returns the moveable section to its original location and the at least one retaining rib is engaged within and retained in the longitudinal channel and at least one of the front base wall, rear base wall, first sidewall and second sidewall is engaged within and retained in the transverse channel. 
     Described more broadly, the present invention is an apparatus for engaging a trash can dolly with a mop bucket comprising: (a) the trash can dolly including a body with means to retain a trash can and means to enable the trash can dolly to be rolled from one location to another; (b) the mop bucket having a liquid retaining chamber including a base and means to enable the mop bucket to be rolled from one location to another; (c) the base of the mop bucket having a lower surface having at least one base wall selected from the group consisting of a front base wall, a rear base wall, a first sidewall and a second sidewall, the front base wall, rear base wall, first sidewall and second sidewall all aligned and all extending in a direction away from the lower surface of the base and in a direction away from the liquid retaining chamber; (d) the trash can dolly having an interconnecting section including a fixed section affixed to the body of the trash can dolly and having a top surface, the interconnecting section having a movable section rotatably affixed to the fixed section, the interconnecting section having a protruding ramp section at a location remote from where the movable section is rotatably affixed and a transverse channel of sufficient depth and width to receive and retain any one of the front base wall, rear base wall, first sidewall and second sidewall of the mop bucket, the movable second section having return means to provide a force to retain the movable section against the fixed section, a relative rolling motion of the trash can dolly and the mop bucket enables the ramp section to come in contact with at least one of the front base wall, rear base wall, first sidewall and second sidewall so that a force from at least one of the front base wall, rear base wall, first sidewall and second sidewall against the ramp section overcomes the force of the return means and causes the moveable section to rotate so that the ramp section is rotated to a location below the mop bucket so that the ramp section is moved to a location where the at least one of the front base wall, rear base wall, first sidewall or second sidewall is engaged into the transverse channel of the ramp section so that the force against the ramp section is released and the return means force returns the movable section to its original location. 
     Described more broadly, the present invention an apparatus for engaging a trash can dolly with a mop bucket comprising: (a) the trash can dolly including a body with an upper surface with means to retain a trash can thereon, a lower surface with means to retain a multiplicity of spaced apart rolling wheels to enable the trash can dolly to be rolled from one location to another; (b) the mop bucket having upper sidewalls surrounding an upper surface of a base to form a chamber for retaining liquid, the base having means to retain a multiplicity of spaced apart rolling wheels to enable the mop bucket to be rolled from one location to another; (c) the base of the mop bucket having a lower surface having at least one base wall and a retaining rib extending transversely from an interior wall of the at least one base wall for a given distance toward a center of the mop bucket; (d) the trash can dolly having an interconnecting section including at least a movable section rotatably affixed to the trash can dolly and having a protruding ramp section having a longitudinal channel having a sufficient depth and width to receive and retain the retaining rib of the mop bucket and a transverse channel of sufficient depth and width to receive and retain the at least one base wall, return force means to provide a force to retain the movable section against the trash can dolly, a relative rolling motion of the trash can dolly and the mop bucket enables the ramp section to come in contact with the retaining rib so that a force of at least one retaining rib against the ramp section overcomes the force of the return means and causes the moveable section to rotate so that the ramp section is rotated to a location below the mop bucket so that after the ramp section is moved to a location further under the mop bucket than a given length of the retaining rib, the force of the retaining rib against the ramp section is released and the force of the return means returns the moveable section to its original location and the retaining rib is engaged within and retained in the longitudinal channel and at least one base wall is engaged within and retained in the transverse channel 
     Described even more broadly, the present invention is an apparatus for engaging a trash can dolly with a mop bucket comprising: (a) the trash can dolly including a body with an upper surface with means to retain a trash can thereon, a lower surface with means to retain a multiplicity of spaced apart rolling wheels to enable the trash can dolly to be rolled from one location to another; (b) the mop bucket having upper sidewalls surrounding an upper surface of a base to form a chamber for retaining liquid, the base having means to retain a multiplicity of spaced apart rolling wheels to enable the mop bucket to be rolled from one location to another; (c) the base of the mop bucket having a lower surface having at least one base wall; and (d) the trash can dolly having an interconnecting section including at least a movable section rotatably affixed to the trash can dolly and having a protruding ramp section having a transverse channel of sufficient depth and width to receive and retain that at least one base wall, return force means to provide a force to retain the movable section against the trash can dolly, the movable section having at least one accessible activation means so that a downward force on the at least one activation means to overcome the return force enables the ramp section to rotate to a location below the mop bucket so that after the force on the activation means is released, the return force returns the movable section to its original location and the at least one base wall is engaged within and retained in the transverse channel. 
     Further novel features and other objects of the present invention will become apparent from the following detailed description, discussion and the appended claims, taken in conjunction with the drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Referring particularly to the drawings for the purpose of illustration only and not limitation, there is illustrated: 
         FIG. 1  is a top perspective view of the present invention trash can dolly and attached interconnecting member; 
         FIG. 2  is an exploded top perspective view of the present invention trash can dolly with the interconnecting member removed; 
         FIG. 3  is an exploded bottom perspective view of the present invention trash can dolly with the interconnecting member removed and illustrating the fastening members by which the interconnecting member is attached to the trash can dolly and also illustrating the return force springs; 
         FIG. 4  is a bottom perspective view of the present invention trash can dolly and attached interconnecting member; 
         FIG. 5  is a bottom perspective view of the present invention mop bucket; 
         FIG. 6  is a top perspective view of the present invention trash can dolly connected to a sidewall of one lengthwise side of the present invention mop bucket, also illustrating a mop wringer sitting on the mop bucket; 
         FIG. 7  is a top perspective view of the present invention trash can dolly connected to the front base wall of the present invention mop bucket, also illustrating a mop wringer sitting on the mop bucket; 
         FIG. 8  is a top perspective view of the present invention trash can dolly connected to the rear base wall of the present invention mop bucket; and 
         FIG. 9  is a top perspective view of the present invention trash can dolly connected to the rear base wall of the present invention mop bucket, also illustrating a trash can retained on the trash can dolly. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Although specific embodiments of the present invention will now be described with reference to the drawings, it should be understood that such embodiments are by way of example only and merely illustrative of but a small number of the many possible specific embodiments which can represent applications of the principles of the present invention. Various changes and modifications obvious to one skilled in the art to which the present invention pertains are deemed to be within the spirit, scope and contemplation of the present invention as further defined in the appended claims. 
     Referring to  FIGS. 1 through 4 , there is illustrated a preferred embodiment of the present invention trash can dolly with unique features which enable it to be linked to a mop bucket. The trash can dolly  10  has a trash can retaining section  20  which includes an upper surface  130  having a flat section  132  on which the base of a trash can  200  (See  FIG. 9 ) rests. The trash can retaining section  130  also has a central support member  134  having a circumferential wall  136  which extends above the flat surface  132 , and terminates in an upper surface  138  having a central recess  140 . The circumferential wall  136  has a multiplicity of spaced apart interlocking members of which  133  and  135  are shown. A trash can has an interior section which rests on the central support member  134  and interlocks with the interlocking members  133  and  135  to stabilize the trash can as it rests on the flat surface  130  of the trash can retaining section  20  so that it will not fall off the dolly as it is being rolled from one location to another and will not tip over when trash is placed into the trash can. This portion is a standard feature of trash can dollies and is not unique to the present invention. The lower surface  148  of trash can retaining section  130  has a multiplicity of spaced apart wheel retaining assemblies including wheel support bracket retaining members  150 ,  152 ,  154 ,  156  and  158  which respectively receive a wheel support bracket  160 ,  162 ,  164 ,  166  and  168  which each respectively retain an axle  170 ,  172 ,  174 ,  176  and  178  on which a rolling wheel  180 ,  182 ,  184 ,  186  and  188  is positioned. This portion is also a standard feature of a trash can dolly and is not unique to the present invention. The selection of five (5) wheels is arbitrary and the trash can retaining section  20  may have at least three (3) and possibly more than five (5) wheels. Described broadly, this portion of the apparatus can be described as a trash can retaining section  20  having an upper surface  130  on which an object such as a trash can is retained and a lower surface  140  having means ( 150 ,  152 ,  154 ,  156 ,  158 ,  160 ,  162 ,  164 ,  166 , 168 ,  170 ,  172 ,  174 ,  176 ,  178 ,  180 ,  182 ,  184 ,  186  and  188 ) by which the dolly  10  is rolled from one location to another. 
     Referring to  FIGS. 5 through 8 , the mop bucket  70  has a multiplicity of vertical walls such as four walls, a first lengthwise wall  300 , a second lengthwise wall  310 , a first transverse front wall  320  and a second transverse rear wall  330 . The bucket has a base  340  with an upper surface  342 . The four walls  300 ,  310 ,  320  and  330  and upper surface  342  of base  340  define and surround an interior chamber  322  which retains water and detergent and into which the strands of a mop are immersed. In general this is conventional for a mop bucket and may broadly be defined as a mop bucket cleaning water retaining chamber  322  formed by an upper surface  342  of a base  340  and surrounding walls (such as  300 ,  310 ,  320 , and  330 ). As illustrated in  FIG. 8 , mop wringer  332  rests on the second transverse rear wall  330 . Referring  FIG. 5 , the mop bucket  70  has spaced apart means by which the mop bucket  70  is rolled from one location to another. The means may include a pair of spaced apart front wheel assemblies including first front wheel support bracket retaining member  350  which receives first front wheel support bracket  360  which retains first front wheel axle  370  on which first front rolling wheel  380  is positioned. Similarly, second front wheel support bracket retaining member  352  receives second front wheel support bracket  362  which retains second front wheel axle  372  on which second front rolling wheel  382  is positioned. The means may also include a pair of spaced apart rear wheel assemblies including first rear wheel support bracket retaining member  354  which receives first rear wheel support bracket  364  which retains first rear wheel axle  374  on which first rear rolling wheel  384  is positioned. Similarly, second rear wheel support bracket retaining member  356  receives second rear wheel support bracket  366  which retains second rear wheel axle  376  on which second rear rolling wheel  386  is positioned. 
     The innovations of the present invention will now be described. Referring to  FIG. 5 , the base  340  has a bottom surface  72 . A front base wall  74  extends from bottom surface  72 . Front base wall  74  has an exterior surface  76 , an interior surface  78 , a bottom surface  80  of a given thickness “T 1 ”, the front base wall  74  having a given height “H 1 ”. A front retaining rib  82  extends from interior surface  78  over bottom surface  72  of base  340  for a distance “L 1 ” toward center  390  of base  340  and has a given thickness “T 2 ” and height “H 2 ” which is approximately one-quarter of an inch taller than “H 1 ”. A rear base wall  84  extends from bottom surface  72 . Rear base wall  84  has an exterior surface  86 , an interior surface  88 , a bottom surface  90  of a given thickness “T 1 ”, the rear base wall  84  having a given height “H 1 ”. A rear retaining rib  92  extends from interior surface  88  over bottom surface  72  of base  340  for a distance “L 1 ” toward center  390  and has a given thickness “T 2 ” and height “H 2 ” which is approximately one-quarter of an inch taller than “H 1 ”. A first sidewall  73  extends from bottom surface  72 . First sidewall  73  has an exterior surface  75 , an interior surface  77 , a bottom surface  79  of a given thickness “T 1 ”, the first sidewall  73  has a given height “H 1 ”. A first side retaining rib  81  extends from interior surface  77  over bottom surface  72  of base  340  for a distance “L 1 ” toward center  390  and has a given thickness “T 2 ” and height “H 2 ” which is approximately one-quarter of an inch taller than “H 1 ”. A second sidewall  85  extends from bottom surface  72 . Second sidewall  85  has an exterior surface  87 , an interior surface  89 , a bottom surface  91  of a given thickness “T 1 ”, the second sidewall  85  has a given height “H 1 ”. A second side retaining rib  93  extends from interior surface  89  over bottom surface  72  of base  340  for a distance “L 1 ” toward center  390  and has a given thickness “T 2 ” and height “H 2 ” which is approximately one-quarter of an inch taller than “H 1 ”. The length of ribs  82 ,  92 ,  81  and  93  can be of different lengths and thicknesses. 
     Cross ribs  380 ,  382 ,  384  and  386  provide strength and extend across centerpoint  390  of base  340 . 
     First interconnecting wall  69  is between walls  73  and  74  and second interconnecting wall  81 B is between walls  74  and  85 . Walls  69 ,  73 ,  74 ,  81  and  85  are aligned. 
     Referring to  FIGS. 1 through 4 , dolly  10  has an interconnecting section  30  which has a fixed section  32  formed integral with trash can retaining section  20 . Trash can retaining section  20  of dolly  10  has a circumferential sidewall formed with a rear wall  12 , a front wall  14 , a first sidewall  16  and a second sidewall  18 . Fixed section  32  has an upper fixed section  34  having a rear wall  36  aligned with front wall  14  and extending from front wall  14 . Fixed section  32  has a lower fixed section  38  having a portion of its sidewalls  46  and  50  of the lower fixed section  38  formed integral with sidewalls  16  and  18  of section  20 . Sidewall  46  has a pin receiving opening  46 B. Sidewall  50  has a pin receiving opening  50 B. Lower fixed section  38  has a bottom surface  40  having a pair of spaced apart wheel retaining assemblies including wheel support bracket retaining members  31  and  39  which each respectively receiving a wheel support bracket  33  and  41  which each respectively retain an axle  35  and  43  on which a rolling wheel  37  and  45  is positioned. These assemblies are more broadly referred to as means by which the interconnecting section is rolled from one location to another. Wheels  37  and  45  are aligned with wheels  180 ,  182 ,  184   186  and  188  of trash can retaining section  20  and all wheels roll concurrently as the dolly  10  is rolled from one location to another. The wheels  37  an  45  are positioned on opposite sides of the fixed section  32  to provide stability. The upper fixed section  34  has an upper surface  42  which is aligned with upper surface  132  of trash can retaining section  20 . The upper fixed section  34  has a first sidewall recess  44  extending inwardly from first sidewall  46 A and a parallel oppositely disposed sidewall recess  48  extending inwardly from second sidewall  50 A. First sidewall  46 A has a first pin receiving channel  51 A and second sidewall  50 A has a second pin receiving channel  53 A, each channel located adjacent the front wall  14  of section  20 . The fixed bottom section  38  has a first transverse opening  62  extending through the section and aligned with first sidewall recess  44  and also has a second transverse opening  64  extending through lower fixed section  38  and aligned with second sidewall recess  48 . 
     Referring to  FIG. 3 , formed into lower surface  38 A of lower fixed section  38  are a pair of spring bosses  52  and  54  respectively having internal threads  53  and  55  and a pair of fastening bosses  56  and  58  having internal threads  57  and  59 . 
     Interconnecting section  30  has a movable section  100  having a body  102  including front ramp section  104  positioned in front of the fixed section  32 , the ramp section  104  has an inclined upper surface  106  with a downwardly extending angle “A”, a transverse channel  108  having a depth of approximately “H 1 ” and a longitudinal centrally disposed channel  110  having a depth of approximately “H 2 ”. A pair of springs  112  and  114  are supported by spring bosses  52  and  54  and a plate  116  having a multiplicity of openings  118 ,  120 ,  122 , and  124  enable threaded fastening bolts  126 ,  128 ,  130  and  132  to respectively be threadedly engaged into respectively female threads of  57 ,  53 ,  55  and  59  of bosses  56 ,  52 ,  54  and  58 . Body  102  has a first sidewall  144  having a transverse opening  146  and second sidewall  148  having a transverse opening  150 . Movable section  100  is aligned with fixed section  30  so that opening  146  is aligned with pin receiving opening  46 B and first pin receiving channel  51 A and opening  150  is aligned with pin receiving opening  50 B and second pin receiving channel  53 A. A first connecting pin  152  extends through pin receiving opening  46 B, first pin receiving channel  51 A and opening  146  and a second connecting pin  154  extends through pin receiving opening  50 B, second pin receiving channel  53 A and opening  150 . Moveable section  100  is therefore rotatably affixed to fixed section  30  and rotatable about connecting pins  152  and  154 . Moveable section  100  has a body top surface  160  with a first foot pushbutton  162  affixed to the top surface  160  and aligned with transverse opening  62  and an oppositely disposed second foot pushbutton  164  affixed to the top surface  60  and aligned with transverse opening  64 . 
     When assembled, the movable section  100  of interconnecting section  30  is rotatably affixed to the fixed second  32  of interconnecting section  30 . A downwardly force on ramp section  104  will overcome the force of return coil springs  112  and  114  and cause the movable section  100  to rotate about connecting pins  152  and  154  so that ramp section  104  rotates downwardly. Movable section  100  is aligned with one of the walls  300 ,  310   320 ,  330  of the mop bucket  70 . The dolly  10  is rolled relative to the mop bucket  70  so that the front ramp section  104  is aligned with one of the mop bucket walls. The dolly  10  is rolled and a force is exerted on ramp  104  so that it rotates downwardly relative to the mop bucket  70 . The ramp section  104  is rolled under the mop bucket  70  so that its transverse channel  108  is aligned with a wall  300 ,  310 ,  320  or  330  of the mop bucket  70  and its longitudinal channel  110  is aligned with a corresponding retaining rib  82 ,  92 ,  81  or  93  on the mop bucket  70 . 
     As illustrated in  FIG. 7 , the dolly  10  is rolled relative to the mop bucket  70  so that the dolly  10  is aligned with mop bucket front transverse wall  320  and front base wall  74 . The ramp section  104  is moved underneath the mop bucket until it engages with the front retaining rib  82  which causes a downward force on the ramp  104  and causes the moveable section  100  to rotate in the counterclockwise direction until the dolly is moved sufficiently under the mop bucket so that the ramp section  104  is at a location beyond the length L 1  of retaining rib  82 . After the ramp section is pushed to this distance, the downward force from the front retaining rib  82  which overcame the spring force from springs  114  and  116  is released and the spring forces from springs  114  and  116  cause the moveable section  100  and ramp  104  to rotate in a clockwise direction to return to its original location. Front base wall  74  is engaged into and retained in transverse opening  108  and front retaining rib  82  is engaged into and retained in longitudinal channel  110 . In this way, the dolly  10  and mop bucket  70  are retained together and can be jointly rolled to a cleaning location. The heavy mop bucket  70  with the water does not have to be lifted to engage with the dolly  10 . The two are engaged with a simple rolling motion. 
     In order to release the engagement, a downward force on either pushbutton  162  or  164  causes the spring force from the springs  114  and  116  to be overcome and cause ramp section  104  to rotate in a counterclockwise direction so that the front base wall  74  is disengaged from the transverse opening  108  and the front retaining rib  82  is disengaged from the longitudinal channel  110 . In this way, the trash can dolly and mop bucket can be disengaged relative to each other. 
     As illustrated in  FIG. 8 , the dolly  10  is rolled relative to the mop bucket  70  so that the dolly  10  is aligned with mop bucket rear transverse wall  330  and front base wall  84 . The ramp section  104  is moved underneath the mop bucket until it engages with the rear retaining rib  92  which causes a downward force on the ramp  104  and causes the moveable section  100  to rotate in the counterclockwise direction until the dolly is moved sufficiently under the mop bucket so that the ramp section  104  is at a location beyond the length L 1  of retaining rib  92 . After the ramp section is pushed to this distance, the downward force from the rear retaining rib  92  which overcame the spring force from springs  114  and  116  is released and the spring forces from springs  114  and  116  cause the moveable section  100  and ramp  104  to rotate in a clockwise direction to return to its original location. Rear base wall  84  is engaged into and retained in transverse opening  108  and rear retaining rib  92  is engaged into and retained in longitudinal channel  110 . In this way, the dolly  10  and mop bucket  70  are retained together and can be jointly rolled to a cleaning location. The heavy mop bucket  70  with the water does not have to be lifted to engage with the dolly  10 . The two are engaged with a simple rolling motion. 
     In order to release the engagement, a downward force on either pushbutton  162  or  164  causes the spring force from the springs  114  and  116  to be overcome and cause ramp section  104  to rotate in a counterclockwise direction so that the rear base wall  84  is disengaged from the transverse opening  108  and the rear retaining rib  92  is disengaged from the longitudinal channel  110 . In this way, the trash can dolly and mop bucket can be disengaged relative to each other. 
     As illustrated in  FIG. 6 , the dolly  10  is rolled relative to the mop bucket  70  so that the dolly  10  is aligned with mop bucket second sidewall  310  and second sidewall  85 . The ramp section  104  is moved underneath the mop bucket until it engages with the second side retaining rib  93  which causes a downward force on the ramp  104  and causes the moveable section to rotate in the counterclockwise direction until the dolly is moved sufficiently under the mop bucket so that the ramp section is at a location beyond the length of retaining rib  93 . After the ramp section is pushed to this distance, the downward force from the second side retaining rib  93  which overcame the spring force from springs  114  and  116  is released and the spring forces from springs  114  and  116  cause the moveable section  100  and ramp  104  to rotate in a clockwise direction to return to its original location. The second sidewall  85  is engaged into and retained in transverse opening  108  and second side retaining rib  93  is engaged into and retained in longitudinal channel  110 . In this way, the dolly  10  and mop bucket  70  are retained together and can be jointly rolled to a cleaning location. The heavy mop bucket  70  with the water does not have to be lifted to engage with the dolly  10 . The two are engaged with a simple rolling motion. 
     In order to release the engagement, a downward force on either pushbutton  162  or  164  causes the spring force from the springs  114  and  116  to be overcome and cause ramp section  104  to rotate in a counterclockwise direction so that the second sidewall  85  is disengaged from the transverse opening  108  and the second side front retaining rib  93  is disengaged from the longitudinal channel  110 . In this way, the trash can dolly and mop bucket can be disengaged relative to each other. 
     Although not illustrated, it will be appreciated that the dolly  10  can be rolled relative to the mop bucket  70  so that the dolly  10  is aligned with mop bucket firsts sidewall  300  and first sidewall  73 . The ramp section  104  is moved underneath the mop bucket until it engages with the first side retaining rib  81  which causes a downward force on the ramp  104  and causes the moveable section  100  to rotate in the counterclockwise direction until the dolly is moved sufficiently under the mop bucket so that the ramp section is at a location beyond the length of retaining rib  81 . After the ramp section is pushed to this distance, the downward force from the first side retaining rib  81  which overcame the spring force from springs  114  and  116  is released and the spring forces from springs  114  and  116  cause the moveable section  100  and ramp  104  to rotate in a clockwise direction to return to its original location. First sidewall  73  is engaged into and retained in transverse opening  108  and first side retaining rib  81  is engaged into and retained in longitudinal channel  110 . In this way, the dolly  10  and mop bucket  70  are retained together and can be jointly rolled to a cleaning location. The heavy mop bucket  70  with the water does not have to be lifted to engage with the dolly  10 . The two are engaged with a simple rolling motion. 
     In order to release the engagement, a downward force on either pushbutton  162  or  164  causes the spring force from the springs  114  and  116  to be overcome and cause ramp section  104  to rotate in a counterclockwise direction so that the first sidewall  73  is disengaged from the transverse opening  108  and the front retaining rib  82  is disengaged from the longitudinal channel  110 . In this way, the trash can dolly and mop bucket can be disengaged relative to each other. 
     For engagement with the front and rear of the mop bucket, the engagement of the retaining rib is an extra safety precaution. The engagement of just the front base wall  74  or rear base wall  84  is usually sufficient. For engagement of the first sidewall  73  or second sidewall  85 , the engagement of the retaining rib  81  or  93  is necessary because the distance of the lengthwise side of the mop bucket is long enough that the dolly  10  could move along the sidewalls  73  and  85  but the transverse grip of the retaining rib prevents this motion. 
     If there are no retaining ribs, then the downward force on ramp  104  can be extended by a respective one of the front base wall  74 , rear base wall  94 , first sidewall  73  or second sidewall  85  to cause the sidewall to be engaged with the transverse channel  100 . The release is also activated by a downward force on the moveable section  100 . 
     Of course the present invention is not intended to be restricted to any particular form or arrangement, or any specific embodiment, or any specific use, disclosed herein, since the same may be modified in various particulars or relations without departing from the spirit or scope of the claimed invention hereinabove shown and described of which the apparatus or method shown is intended only for illustration and disclosure of an operative embodiment and not to show all of the various forms or modifications in which this invention might be embodied or operated.