Abstract:
A manually-operated cart retrieves a waste container from a compactor and transports the waste container across a support surface to a waste collection receptacle. An operator activates a winch and a belt that extends from the winch to a base frame lifts the base frame. The base frame is constrained to travel between a pair of vertically disposed channel members that form part of a back frame for the cart. A waste container rotating apparatus is secured to the base frame and is lifted with it until an immovable barrier secured to one of the channel members is encountered. Continued lifting of the base frame effects rotation of the waste container about an axis of rotation until the waste container tilts sufficiently to allow waste contained in it to fall out under the influence of gravity into the waste collection receptacle.

Description:
BACKGROUND OF INVENTION 
     1. Field of the Invention 
     This invention relates, generally, to the waste disposal industry. More particularly, it relates to a cart having a rotatable mechanism for retrieving, transporting, lifting, and emptying heavy compacted waste from a novel portable container into a large waste receptacle such as a dumpster. 
     2. Description of the Prior Art 
     Large machines called compactors are used in many industries for compacting waste materials to save space. A compactor is essentially a box with a motor-driven plate in it that compresses waste in the box. The compressed waste is then pressed into a portable waste container and the portable waste container is then transported to a dumpster. 
     Perhaps the most difficult part of the waste disposal process is the emptying of the portable waste container. The invention disclosed in U.S. Pat. No. 5,320,475 to the present inventor entitled “Retriever And Cart For Handling Heavy Containers” discloses a retriever that retrieves and transports multiple waste containers at one time. However, it includes no means for elevating a waste container to a preselected height and for rotating the container upon attaining that height so that the contents of the waste container may be discharged therefrom under the influence of gravity into a floor level waste receptacle. 
     Therefore, there is a need for an apparatus that lifts and rotates a waste container so that its contents may be dumped into a floor level waste receptacle. 
     The highly compressed waste in the portable waste container may also become stuck in the container. Thus, there is also a need for an improved waste container that is designed so that the compressed waste therein falls out easily when the waste container is emptied. 
     It is also not an easy task for a single worker to retrieve a heavy waste container from a compactor, and to transport it to a dumpster. Most systems require a worker manually place the waste container on a cart. 
     Thus a need exists for a retriever mechanism that enables a single worker to retrieve a waste container in the substantial absence of manual effort. 
     However, in view of the prior art considered as a whole at the time the present invention was made, it was not obvious to those of ordinary skill in the pertinent art how the identified needs could be efficiently and elegantly fulfilled. 
     SUMMARY OF INVENTION 
     The long-standing but heretofore unfulfilled need for an apparatus operated by a single worker that retrieves a portable waste container from a compactor, transports it to a dumpster, and that elevates and rotates the waste container to empty it into a dumpster in the substantial absence of physical exertion by the worker is now met by a new, useful, and nonobvious invention. 
     The novel manually-operated cart of this invention is adapted to retrieve a novel portable waste container from a compactor, transport the waste container to a dumpster, elevate the waste container to a preselected height, and to dump the contents of the waste container into a larger waste collection receptacle. 
     The portable waste container is novel as well because it is designed to prevent waste tightly compacted therein from becoming stuck so that it slides out easily upon tilting of the container by the novel cart. 
     The novel portable cart includes a vertical back frame formed primarily by a pair of parallel, transversely opposed, upstanding (vertical) channel members. A barrier means is fixedly secured to a preselected channel member of the back frame at a preselected height. The barrier means serves as a pivot point and performs the function of causing the waste container to rotate as it is lifted as more fully described hereinafter. 
     A pair of parallel, horizontally disposed support arms are secured to the respective lower ends of the channel members that form a part of the vertical back frame. The support arms extend from their respective channel members in cantilevered relation thereto in a forward direction. The forward end of each cantilevered support arm is supported by a rotatably mounted caster wheel and the rearward end of each cantilevered arm is supported by a primary tire. 
     A first and second auxiliary tire of a size smaller than the primary tires is rotatably mounted to the rearwardmost end of first and second rearwardly-extending cantilevered arms to enable an operator to safely tilt the cart back upon encountering an obstacle such as a curb. 
     A base frame is positioned between and adapted to movably engage the channel members so that the base frame is movable between a lower end of the back frame and an upper end of the back frame. A waste container-engaging frame is secured to the base frame. The waste container-engaging frame includes a back frame member secured to the base frame and a pair of parallel container-engaging members secured to opposite ends of the back frame. The parallel container-engaging members are mounted in cantilevered relation to the back frame member and extend in a horizontal plane in a forward direction. As used herein, the term “forward” refers to the side of the cart that supports the waste container and the term “rearward” refers to the side of the cart where the operator stands or walks when the cart is in use. 
     A winch means selectively lifts and lowers the base frame, and the container-engaging members that extend therefrom, along the vertical extent of the vertical back frame. The winch means may be provided in the form of a common boat winch. It is mounted on the rearward side of the vertical back frame at a preselected height so that it does not interfere with the raising and lowering of the base frame. The preselected height is selected to make the control handle of the winch easily operable by a person of ordinary height. 
     A waste container rotating means is secured to and supported by the base frame member. The waste container rotating means has a planar construction and is positioned in a vertical plane that is coplanar with the base frame and parallel to the plane of the vertical back frame. A track that slidingly receives the above-mentioned barrier means is formed in the waste container rotating means. The track has a vertical part, a horizontal part, and a gradual ninety-degree bend in open communication with the vertical and horizontal parts. The track is in vertical alignment with the barrier means so that the barrier means enters into the track when the winch means lifts the base frame and hence the waste container rotating means to a first preselected elevation above the barrier means. 
     The waste container is gradually inverted as the barrier means encounters the gradual ninety-degree bend as the winch means lifts the base frame to a second preselected elevation above the first preselected elevation. The base frame pivots about a fixed position axle member as the base member is lifted and lowered. 
     A waste container-engaging means holds the waste container as the waste container is rotated or tilted so that contents of the waste container fall from the waste container under the influence of gravity when the waste container is so rotated or tilted. 
     The novel container has four walls, each of which is preferably tapered on an inside surface thereof, first at a gradual taper as the side walls extend downwardly from the rim of the waste container and secondly at a steeper taper as the side walls approach the bottom wall of the container. Upstanding ribs that project inwardly from the side walls also serve to prevent a vacuum from forming in the waste container when a full plastic bag is pressed thereinto by a compactor. 
     The vertical back frame of the novel cart further includes a horizontal top frame that interconnects respective uppermost ends of the upstanding pair of channel members, a horizontal bottom frame that interconnects respective lowermost ends of said upstanding pair of channel members, and at least one horizontal interconnecting frame that interconnects the channel members at a preselected location between the top and bottom frames. The winch means is mounted to the at least one interconnecting frame. 
     Connection means are provided for interconnecting the winch means and the base frame so that operation of the winch means in a first direction lifts the base frame and so that operation of the winch means in a second direction lowers the base frame. The connection means is preferably provided in the form of a belt in lieu of ropes or chains. 
     A pulley is mounted to the horizontal top frame of the vertical back frame and the belt follows a path of travel that extends upwardly from the winch means, over the pulley with an angle of wrap nearly equal to one hundred eighty degrees, and downwardly to the base frame. 
     The base frame is formed by a pair of vertical base frame members that define opposite sides of the base member, a pair of horizontal base frame members that interconnect the pair of vertical base frame members to each other, and an engaging means secured to a preselected horizontal base frame member for enabling the belt to engage said preselected horizontal member of the pair of horizontal members. 
     A first upper wheel is engaged to an upper end of the first vertical base frame member on an outboard side thereof, a second upper wheel is engaged to an upper end of the second vertical base frame member on an outboard side thereof, a first lower wheel is engaged to a lower end of the first vertical base frame member on an outboard side thereof, and a second lower wheel is engaged to a lower end of the second vertical base frame member on an outboard side thereof. The first upper and lower wheels are disposed in engaging relation to a first channel member of the pair of vertical channel members that form the vertical back frame and the second upper and lower wheels are disposed in engaging relation to a second channel member of the pair of vertical channel members. The base frame is thereby constrained to travel upwardly and downwardly between the first and second channel members when the winch means is operated in a first direction and a second direction, respectively. 
     The waste container rotating means that is secured to the back frame in upstanding relation thereto includes the pair of horizontally disposed, forwardly-extending waste container-engaging arms, mentioned above, that perform the function their name expresses. A groove is formed in each arm of the pair of arms in confronting relation to one another and each groove is adapted to slidingly receive a flange formed in the waste container on opposite sides thereof. The grooves retain flanges when the waste container is rotated or tilted. 
     A retainer means is also provided to prevent the waste container from sliding from the grooves formed in said arms when the waste container is lifted and rotated. The retainer means includes a pair of pivotally mounted, generally “L”-shaped first and second retainers adapted to releasably engage a generally “L”-shaped lip formed in the waste container along a rearward edge thereof. A similar “L”-shaped lip is also formed along a forward edge of the waste container so that the operator may engage the novel waste container from the front or back. 
     The retainer means includes a plurality of truncate sleeves secured to said back frame member in longitudinally spaced apart relation to one another along the extent of the back frame member. An elongate rod means extends in ensleeved relation through each of the truncate sleeves. The elongate rod means is rotatable about a longitudinal axis of symmetry within the truncate sleeves. The “L”-shaped retainers are secured to opposite ends of the elongate rod in rotational alignment with one another. A lever is formed integrally with the first retainer and the elongate rod provides a fulcrum for the lever. A bias means holds the lever in a position of repose where the first retainer and hence the second retainer are disposed in engaging relation to the “L”-shaped lip formed in the waste container. The lever is adapted to be pivoted about the fulcrum by an operator. When pivoted out of the position of repose, the lever effects simultaneous and corresponding rotation of the elongate rod about its longitudinal axis so that the first retainer and the second retainer conjointly release the “L”-shaped lip formed in the waste container. When the lever is released, it is returned by the bias means to the position of repose where the first and second retainers engage the “L”-shaped lip and prevent sliding of the waste container from the grooves. 
     The novel braking means for braking the primary tires, which are preferably of the pneumatic type, include a vertically disposed, first wheel-mounting plate secured to a first channel member of the pair of channel members at a lower end thereof and a vertically disposed, second wheel-mounting plate secured to a second channel member of the pair of channel members at a lower end thereof. The first wheel-mounting plate has a first aperture formed therein near an upper end thereof, a vertically-extending slot formed substantially mid-length thereof, and a second aperture formed near a lower end thereof. The second wheel-mounting plate also has a first aperture formed therein near an upper end thereof, a vertically-extending slot formed substantially mid-length thereof, and a second aperture formed near a lower end thereof. 
     A mounting rod has its respective opposite ends rotatably positioned in the respective first apertures formed in the first and second wheel-mounting plates at the respective upper ends thereof. A braking rod, disposed in parallel relation to the mounting rod, has its respective opposite ends slideably positioned in the respective vertically extending slots formed in the first and second wheel-mounting plates. An axle rod has its respective opposite ends slideably positioned in the respective apertures formed in the first and second wheel-mounting plates at the respective lower ends thereof. 
     A first bias means is positioned in interconnecting relation between a first end of the mounting rod and a first end of the braking rod and a second bias means is positioned in interconnecting relation between a second end of the mounting rod-and a second end of the braking rod. 
     The first and second bias means position the braking rod at the respective upper ends of the vertically extending slots when the first and second bias means are in repose. A brake means overcomes the bias means and urges the braking rod into tight frictional engagement with the primary tires so that said primary tires cannot rotate when the bias means has been overcome. 
     The brake means includes a first locking plate having an aperture formed in its opposite ends. The first locking plate is positioned at a first end of the mounting rod and the first end of the mounting rod is received within an upper aperture of the pair of apertures formed in the first locking plate. A second locking plate has an aperture formed in its opposite ends and is positioned at a second end of the mounting rod and the second end of the mounting rod is received within an upper aperture of the pair of apertures formed in the second locking plate. A third locking plate has an aperture formed in its opposite ends and is positioned at a first end of the braking rod. The first end of the braking rod is received within a lower aperture of the pair of apertures formed in the third locking plate. A fourth locking plate has an aperture formed in its opposite ends and is positioned at a second end of the braking rod. The second end of the braking rod is received within a lower aperture of the pair of apertures formed in the fourth locking plate. 
     The first and second locking plates are pivotally joined to one another at a first pivot point defined by the lower aperture of the first locking plate and the upper aperture of the second locking plate. The third and fourth locking plates are pivotally joined to one another at a second pivot point defined by the lower aperture of the third locking plate and the upper aperture of the fourth locking plate. 
     When the bias means is in repose, the first and second pivot points are positioned rearwardly of the braking rod and when the bias means is overcome, the first and second pivot points are positioned forwardly of the braking rod. When positioned forwardly, the opposite ends of the braking rod press tightly against the pneumatic tires to prevent their rotation. A cam-over-center locking action is achieved when the first and second pivot points are displaced from their in repose, rearwardly position to their locking, forward position so that the locking action cannot be overcome unless a force greater than the cam-over-center locking action is generated. 
     The means for locking the primary tires is provided in the form of a first foot-operated lever that, when depressed, drives the first and second pivot points forwardly and the means for unlocking the primary tires is provided in the form of a second foot-operated lever that, when depressed, drives the first and second pivot points rearwardly. The first lever is secured to the first locking plates and the second lever is secured to the third locking plate. 
     Additional structure of the invention is disclosed in the detailed description that follows. 
     An important object of this invention is to provide a cart that enables an operator to retrieve a waste container from a compactor in the absence of substantial physical exertion. 
     A further object is to provide an apparatus that enables an operator to transport a retrieved waste container to a large waste receptacle in the substantial absence of physical exertion. 
     Another important object is to provide a waste container that easily releases its contents when rotated for emptying. 
     A further object is to provide an apparatus that lifts a heavy waste container to a preselected elevation and that rotates or tilts the container so that its contents fall therefrom under force of gravity into a larger waste receptacle. 
     A closely related object is to accomplish the foregoing objects with an apparatus that is safe and easy to operate without requiring an operator to have special skills. 
     These and other important objects, advantages, and features of the invention will become clear as this description proceeds. 
     The invention accordingly comprises the features of construction, combination of elements, and arrangement of parts that will be exemplified in the description set forth hereinafter and the scope of the invention will be indicated in the claims. 
    
    
     BRIEF DESCRIPTION OF DRAWINGS 
     For a fuller understanding of the nature and objects of the invention, reference should be made to the following detailed description, taken in connection with the accompanying drawings, in which: 
     FIG. 1 is a side elevational view of an illustrative embodiment of the invention with a portable container outlined in broken lines; 
     FIG. 2 is a front elevational view of an illustrative embodiment of the invention with the waste container outlined in broken lines and FIG. 2 is also is the first figure in a five figure animation that depict the lifting of the waste container by a winch and the rotating or tilting of the waste container that enables the contents of the waste container to fall therefrom into a larger waste receptacle; 
     FIG. 3 is the second figure in said animation; 
     FIG. 4 is the third figure in said animation; 
     FIG. 5 is the fourth figure in said animation; 
     FIG. 6 is the fifth figure in said animation; 
     FIG. 7 is a detailed, front elevational view of the base frame and the waste container rotating means; 
     FIG. 8 is an isometric view of the waste container engaging means and the waste container rotating means; 
     FIG. 9 is a rear isometric view of the braking mechanism of the cart in the braked mode; and 
     FIG. 10 is a rear isometric view of the FIG. 9 structure in the brake-released mode. 
    
    
     DETAILED DESCRIPTION 
     Referring now to FIG. 1, it will there be seen that the novel cart is denoted  10  as a whole. As best depicted in FIG. 2, cart  10  includes a back frame  12  that is approximately three times as tall as the height of portable waste container  14 . Back frame  12  is formed by a pair of upstanding, parallel channel members  16 ,  16  that are interconnected at their respective upper ends by horizontally disposed top channel member  18  and at their respective lower ends by square tube member  20 . 
     A pair of transversely opposed support arms in the form of square tubes  22 ,  22  are secured to the respective lower ends of channel members  16 ,  16  and extend horizontally therefrom in a forward direction in relation to said channel members. Swivelly-mounted caster wheels  24 ,  24 , support their respective distal free ends. In FIG. 1, the “forward” side of cart  10  is the left or waste container  14  side and the “rearward” side is the right side where the operator stand or walks. 
     Pneumatic tires  26 ,  26  are rotatably mounted to primary axle  28  and the opposite ends of axle  28  are supported by flat plates  30 ,  30  that are secured to respective lower ends of upstanding channel members  16 ,  16  and which extend rearwardly therefrom as depicted in FIG.  1 . Flat plates  30 ,  30  further support auxiliary axle  32  having auxiliary solid rubber tires  34 ,  34  secured to its opposite ends. Auxiliary tires  34 ,  34  are positioned rearwardly with respect to primary tires  30 ,  30 . Said auxiliary tires  34 ,  34  facilitate the tilting back of cart  10  with tires  30 ,  30  raised from a support surface should the need arise. 
     Handle member  36 , positioned about mid-height of vertical back frame  12 , includes rearwardly extending, horizontally disposed, parallel rods  38 ,  38  secured to upstanding channel members  16 ,  16 , respectively. Rod  40  interconnects rods  38 ,  38 . A user grasps rod  40  when cart  10  is transported. 
     A comparison of FIGS. 1 and 2 indicates that waste container  14  is in a lowermost position of repose in FIG. 1 where it is supported by support arms  72 ,  72  and that said waste container  14  elevated in FIG. 2 with respect to said lowermost position. In FIG. waste container  14  is still further elevated; note that bottom wall  15  thereof has cleared pneumatic tires  26 ,  26 . In FIG. 4, the elevation of waste container  14  is much more pronounced. In FIG. 5, waste container  14  has begun to tilt about a horizontal axis and in FIG. 6, waste container is rotated or tilted to an extent sufficient to enable its contents to fall therefrom under the influence of gravity. In FIG. 6, the content of waste container  14  is a waste-filled plastic bag  13 . 
     The structure that lifts and empties waste container  14  is best understood in connection with FIGS. 7 and 8. Referring first to FIG. 7, base frame  42  includes two horizontally disposed square tubular members  44 ,  46  and two vertically disposed square tubular members  48 ,  50  that are welded together in an open square frame as depicted. A first pair of tapered nylon rollers, collectively denoted  52 , are rotatably mounted to opposite ends of square tubular member  48  and a second pair of said tapered nylon rollers, also collectively denoted  52 , are rotatably mounted to opposite ends of square tubular member  50 . Rollers  52  fit within and are guided by upstanding channel members  16 ,  16 . 
     Lower horizontal frame member  46  is suitably apertured to receive the opposed arms of inverted “U” clamp  54  as depicted in said FIG.  7 . The nuts that secure said “U” clamp to frame member  46  are collectively denoted  55 . A small, unnumbered clearance space is visible in FIG. 7 between a horizontal part of said “U” clamp and frame member  46 . The lower end of an elongate, vertically disposed fabric winch  56  engages said horizontal part of said “U” clamp  54 . It should therefore be understood that take-up of winch strap  56  lifts base frame  42  and that said base frame remains within the plane defined by vertical back frame  12  of cart  10  due to the captured relation of nylon tapered wheels  52  relative to vertical channel members  16 ,  16 . Play out of winch strap  56  lowers base frame  42  under the influence of gravity. 
     As best understood in connection with FIGS. 1 and 2, winch  58  is mounted to a pair of horizontally disposed mounting members, collectively denoted  60 , that span the distance between upstanding channel members  16 ,  16 . The opposite ends of mounting members  60 ,  60  are secured to said upstanding channel members  16 ,  16 . Winch  58  is mounted so that it extends to the rearward side of cart  10 , as depicted in FIG. 1, so that it does not interfere with the path of travel of waste container  14  as it is lifted by winch strap  56 . As suggested by double-headed directional arrow  63  in FIG. 1, an operator rotates crank handle  62  in a first direction to cause winch  58  to take-up winch strap  56 , thereby lifting waste container  14 , and in a second direction, opposite to the first direction, to cause the winch to play out said winch strap, thereby lowering waste container  14 . 
     Winch strap  56  passes over pulley  64  that is rotatably mounted within the confines of top channel member  18 , said top channel member  18  being oriented so that it is open at the bottom to receive winch strap  56 . 
     Winch  58  may be provided in the form of a commercially available boat winch. It includes an internal clutch that prevents waste container  14  from free falling if the winch were to fail. In an alternate embodiment, a battery-operated reversible electric motor, not shown, could be connected in driving relation to winch  58  in lieu of crank handle  62 . 
     The structure that effects tilting of waste container  14  as it nears the top of cart  12  is best depicted in FIGS. 7 and 8 as aforesaid but understanding its operation also requires consideration of FIGS. 1-6. Barrier means or cam roller  66  is secured to a preselected upstanding channel member  16 . Cam roller  66  can rotate about an axis of rotation, but it cannot be displaced upwardly or downwardly relative to said upstanding channel member  16 . Thus, it serves as a barrier means. Specifically, when winch  58  lifts waste container  14 , said waste container encounters barrier means  66  and is rotated by it so that the contents of the waste container fall therefrom into a dumpster or other waste-collection receptacle. 
     The vertical height of cam roller  66  may be changed as desired so that the height at which waste container  14  is tilted may be changed as may be required in differing applications. 
     The waste container rotating means that cooperates with cam roller or barrier means  66  to rotate waste container  14  as it is lifted by winch  58  is denoted as a whole by the reference numeral  68  in FIGS. 7 and 8. Waste container rotating means  68  surmounts square tube member  70  that is the back frame member of waste container engaging means  69 . Back frame  70  is secured as indicated in FIG. 7 to vertical frame members  48  and  50  of base frame  42 . 
     As best understood in connection with FIGS. 1 and 8, container-engaging arms  72 ,  72 , in the form of square tubes, are secured to opposite ends of square tube member  70  and project forwardly therefrom in a horizontal plane. Slots  74 ,  74  are milled or otherwise formed in the respective confronting walls thereof. An unillustrated flange formed in opposite sides of waste container  14 , near bottom wall  15  thereof, is slideably engaged in each of said slots  74 ,  74  when waste container  14  is retrieved from a compactor, not shown. 
     However, retaining means are also needed to prevent waste container  14  from sliding out of slots  74 ,  74 . That retaining means is provided in part by an unillustrated upturned lip formed on the rearward side of waste container  14 . A lip of the same construction is also provided on the forward side of the waste container so that the operator need not distinguish between said front and rear sides. Clips  76  and  78  that are positioned near but not secured to opposite ends of square tube  70  as best indicated in FIG. 8 engage that upturned lip. Clip  76  includes a foot pedal  80  that when stepped upon, rotates clips  76 ,  78  out of engaging relation to said upturned lip. Clip  78  has no foot pedal, but it rotates conjointly with clip  76  because both of said clips are secured to rod  82  that is rotatable about its longitudinal axis. Rod  82  is made of plural straight sections joined to one another by truncate sleeves  84  that are welded or otherwise secured to square tube  70 . Stepping on foot pedal  80  causes it to rotate in the manner indicated by directional arrow  81  and further causes clip  78  to rotate in the manner also indicated by a directional arrow  81 . Such upward rotation disengages downwardly turned clips  76 ,  78  from the unillustrated upwardly turned lip formed integrally with waste container  14 . A bias means, not shown, may be employed to return clips  76 ,  78  to their respective positions of repose when foot pedal  80  is released, or foot pedal  80  may be returned to its FIG. 8 position by lifting it with the same foot used to depress it. 
     In the alternative, the respective vertical parts of clips  76 .  78  could be tilted rearwardly so that they are shoved out of the way, i.e., lifted when the waste container is retrieved. The bias means would bring them downwardly into locking engagement with the unillustrated lip and foot pedal  80  would then be required only during the release operation that is performed after the empty waste container is returned to the compactor. 
     Significantly, the height of arms  72 ,  72  relative to a horizontal support surface is preselected so that said arms are aligned with the unillustrated waste container flanges when the waste container is positioned in operative relation to the compactor. The operator opens the door of the compactor to expose the waste container and pushes cart  10  into the compactor so that slots  74 ,  74  formed in arms  72 ,  72  slideably engage said unillustrated flanges formed in waste container  14 . The engagement of such flanges and slots  74 ,  74  and the engagement of the above-described upturned lip by clips  76 ,  78  prevents waste container  14  from falling when it is rotated or tilted. 
     After the operator has retrieved waste container  14  from the compactor, cart  10  is used to transport the waste container to a larger waste receptacle. Clips  76 ,  78  are not released until the emptying operation is over and the waste container has been returned to the compactor. Stepping on foot pedal  80  then allows the operator to remove cart  10  from the compactor, leaving an empty waste container  14  in operative relation to the compactor. 
     Structure  68  that rotates waste container  14  is mounted in upstanding relation to square tube  70  as aforesaid. It should therefore be understood that structure  68  is positioned in a vertical plane parallel to the vertical plane of upstanding channel members  16 ,  16  of cart  10 . Structure  68  includes a pair of upstanding flat frame members denoted  86 ,  88 , the former having a greater extent than the latter as depicted. Curved frame member  90  has a horizontal part  89  and a vertical part  91  that are formed integrally with one another and joined to one another by a gradual ninety-degree bend. A first end of curved frame  90  is secured to upstanding flat frame  86  in normal relation thereto so that said horizontal section  89  extends from upstanding flat frame  86  in a horizontal plane. Upstanding flat frame  88  is parallel to upstanding flat frame  86  and supports horizontal section  89  of curved frame  90  as depicted. An upwardly turned ninety-degree bend is formed in curved frame  90  to form vertical part  91 . The upper end of vertical part  91  is secured to first side support flat frame  92  that extends at a preselected angle relative to a vertical plane between a preselected end of square tube  70  and the upper end of vertical part  91 . Similarly, a second curved frame  94  having a straight horizontal section  93  and a straight vertical section  95  is secured at a first end to upstanding flat frame  86  and its upper end is secured to inclined flat frame  96  having a first end secured to square tube  70 . Flat frame  96  is supported substantially mid-length thereof by upstanding flat frame  86 . 
     Structure  68  further includes a flat mounting plate  98  that is bordered at its top by horizontal section  89  of curved plate  90 , at its bottom by square tube  70 , and at its sides by upstanding flat frames  86 ,  88 . 
     As best understood in connection with FIG. 7, pintle or axle member  99  is mounted to horizontal frame  44  of base frame  42  and projects therefrom in a forwardly direction, i.e., toward waste container  14 . Base frame  42  rotates about axle member  99  when the waste container is under rotation. Axle member  99  also serves to support base frame  42  when said base frame is not under rotation. 
     Curved frames  90  and  94  are spaced apart from one another a fixed, predetermined distance to form a curved track  100  therebetween. As best understood in connection with FIGS. 4-6, the upper end of track  100  receives roller cam  66  when container  14  attains the height depicted in FIG.  4 . As winch  58  continues to raise waste container  14 , as indicated in FIG. 5, fixed position roller cam  66  encounters the bend in track  100  and waste container  14  is constrained to rotate about said roller cam  66  until it is tilted as depicted. Note that roller cam  66  is positioned substantially in the middle of the curve of track  100  at this point. Continued lifting of waste container  14 , as depicted in FIG. 6, causes waste container  14  to tilt even further so that refuse bag  13  falls therefrom under force of gravity as suggested by directional arrow  101 . Note that roller cam  66  has returned to the uppermost end of track  100  at this point. 
     Winch  58  is then reversed and waste container  14  is lowered. Track  100  interacts with roller cam  66  to return waste container  14  to its upright configuration as it is lowered. Again, base frame  42  rotates about axle member  99  during the rotation of waste container  14  and base frame  42 . 
     It is important to lock tires  26 ,  26  of cart  10  when the cart is not in use. The means for locking said tires is depicted in FIGS. 9 and 10. A tire-locking, braking action is provided when opposite ends of braking rod  102  bears against tires  26 ,  26  as depicted in FIG.  9 . FIG. 10 depicts braking rod  102  when spaced away from said tires  26 ,  26  so that said tires are free to rotate about primary axle  28 . 
     In FIG. 9, said opposite ends of braking rod  102  are positioned at the respective lower ends of slots  104 ,  104  formed in upstanding flat plates  106 ,  106 . The respective upper ends of flat plates  106 ,  106  are secured to channel members  16 ,  16  of back frame  12 . The respective lower ends of flat plates  106 ,  106  are apertured to receive the opposite ends of primary axle  28  and the respective upper ends of said flat plates are apertured to receive opposite ends of mounting rod  108 . A tension spring  110  extends in interconnecting relation between rods  108  and  102  at their respective opposite ends so that when said springs  110  are in repose, braking rod  102  is pulled upwardly so that it is spaced away from tires  26 ,  26  as depicted in FIG.  9 . As aforesaid, the opposite ends of braking rod  102  are positioned at the upper end of slots  104 ,  104  when said braking rod  102  is spaced apart from said tires. 
     A foot-operated linkage is provided to actuate the lowering of braking rod  102  into braking relation to tires  26 ,  26 . Truncate upper links  112 ,  112  are apertured to receive opposite ends of mounting rod  108 . There is no relative movement between said mounting rod  108  and said upper links  112 ,  112  so that rotational movement of said upper links is simultaneously imparted to said mounting rod  108 . The same type of connection is made between lower links  114 ,  114  and braking rod  102  so that rotation of said lower links imparts simultaneous and corresponding rotation to said braking rod. Upper links  112 ,  112  are pivotally connected as at  113 ,  113  to lower links  114 ,  114 . 
     As indicated in FIG. 10, when braking rod  102  is in repose, spaced apart from tires  26 ,  26 , links  112 ,  114 , and  112 ,  114  are pivoted rearwardly with respect to waste container  14 , i.e., toward the user. To overcome the bias of tension springs  110 ,  110 , the user steps on foot lever  116  at the left side of braking rod  102 . This causes links  112 ,  114  and  112 ,  114  to rotate about their respective pivot points  113 ,  113  into their respective FIG. 9 positions where said links are pivoted in a forward direction, i.e., toward waste container  14 . This is a “cam-over-center” displacement in that the links will remain in that position, and braking rod  102  will remain in braking relation to tires  26 ,  26  until an external force is applied to overcome the cam-over-center force. That cam-over-center overcoming force is supplied by the user by depressing foot lever  118  at the right side of braking rod  102 . Depressing foot lever  118  rotates said foot lever away from said links and rotates braking bar  102  to which said foot lever  118  is secured for conjoint rotation so that bias members  110 ,  110  return braking rod  102  to its in repose position and return links  112 ,  114 ,  112 ,  114  to their FIG. 10 position of repose where the braking action is released. 
     The inventive structure is safe to handle, easy to operate, and reliable. Significantly, an operator of cart  10  need not possess any special skills. The interaction of barrier means  66  and track  100  that tilts or rotates waste container  14  into its FIG. 6 position requires no special skill of the operator. Nor is any special skill required to lower the waste container. The operator merely needs to operate winch means  58  to raise and lower said waste container  14 . The elegant structure of the barrier means and track includes a wide tolerance so that the unit will not jam or otherwise become inoperative. The primary wheels make the device easy to push from place to place and the auxiliary wheels make it easy to tilt backward to overcome a curb or the like. The foot-operated braking means is also reliable, durable and easy to operate, as is the foot-operated latching means that engages the waste container to the cart. The frame-like construction of the novel cart and its use of readily available materials such as channel members, rods, flat plates, square tubes and the like, makes it economical to manufacture and affordable to the waste removal industry. The novel cart and novel container thus combine to facilitate the retrieval, transporting, lifting, and emptying of the waste container in the substantial absence of physical exertion by the cart operator. 
     It will thus be seen that the objects set forth above, and those made apparent from the foregoing description, are efficiently attained. Since certain changes may be made in the above construction without departing from the scope of the invention, it is intended that all matters contained in the foregoing description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense. 
     It is also to be understood that the following claims are intended to cover all of the generic and specific features of the invention herein described, and all statements of the scope of the invention that, as a matter of language, might be said to fall therebetween. 
     Now that the invention has been described,