Segregated waste collection system

[0002] Priority is claimed based on provisional application Ser. No. 60/110,362 filed Nov. 30, 1998.

[0003] 1. Field of the Invention

[0004] The invention relates to a segregated waste collection system and, more specifically, to a segregated waste collection system having a divided waste cart, defining separate compartments for holding segregated waste, in combination with a divided collection container having corresponding separate compartments for receiving the segregated waste from the divided cart compartments.

[0005] 2. Description of the Related Art

[0006] Segregated waste collection systems are typically used when both recyclable and non-recyclable waste is simultaneously collected. In segregated waste collection systems, it is common to provide a user with a divided waste container, having a dividing wall defining one compartment for recyclable waste and another compartment for non-recyclable waste. A cover for each of the compartments is hingedly mounted to the divider wall in the container and performs the dual function of covering the associated compartment and deflecting the contents of the compartment when the cart is dumped. The waste cart is typically lifted with a mechanical device and inverted so that the compartments within the waste cart overlie corresponding compartments in a waste collection vehicle. As the cart is inverted, the covers open in response to gravity and serve to deflect the contents emptying from the compartments of the cart into the corresponding compartments of the waste vehicle. Examples of such a waste collection system are illustrated in U.S. Pat. Nos. 5,035,563, issued Jul. 30, 1991, U.S. Pat. No. 5,163,805, issued Nov. 17, 1992, U.S. Pat. No. 5,205,698, issued Apr. 27, 1993, and U.S. Pat. No. 5,303,841, issue Apr. 19, 1994.

[0007] One disadvantage of the prior art segregated waste collection system is there is frequently cross contamination of the contents of one cart compartment into cross compartments in the waste vehicle. Another disadvantage is that the cart construction and use becomes increasingly more complex and difficult, especially as the number of compartments increase beyond two, as compared to a traditional cart with a single cover for all the compartments.

[0008] According to the invention, a divided cart has a single cover and a divided waste storage container has deflectors to deflect the waste stored in the divided cart into the appropriate compartments in the divided waste storage container.

[0009] In a preferred embodiment, the divided waste storage container is an intermediate size container adapted to be lifted and dumped into a waste collection vehicle. At least one divider wall divides the intermediate size container into multiple compartments A movable deflector is provided on the intermediate size container divider wall to deflect the waste spilling from the divided cart into the corresponding compartments in the intermediate size container. In the dump position, the deflectors can be moved to a second position where they deflect the waste spilling from the intermediate size container into corresponding compartments in the waste vehicle.

[0010] The invention will now be described with reference to the drawings in which:

[0011] FIG. 1 is a perspective view of a segregated waste collection system including a waste collection vehicle, an intermediate size container, and a divided cart according to the invention;

[0012] FIG. 2 is a perspective view illustrating the connection of the divided cart and intermediate size container of the invention;

[0013] FIG. 3 is an enlarged view of the intermediate size container shown in FIG. 1 and illustrating the deflectors in a filling position;

[0014] FIG. 4 is an enlarged partial view of FIG. 1 in the emptying position and the intermediate size container illustrating the interface between the deflector and the waste collecting vehicle;

[0015] FIG. 5 is a side view of the divided cart connected to the intermediate size container with the divided cart in a loading position;

[0016] FIG. 6 is similar to FIG. 5 except that the divided cart is shown in the emptying position;

[0017] FIG. 7 is a side view of the intermediate size container in an emptying position relative to the waste-receiving vehicle;

[0018] FIG. 8 illustrates a second embodiment of the deflectors shown in the filling position;

[0019] FIG. 9 illustrates the second embodiment of the deflectors in an emptying position;

[0020] FIG. 10 illustrates an alternative embodiment of a divided cart; and

[0021] FIG. 11 illustrates the alternative embodiment divided cart mounted to the intermediate size container in the emptying position.

[0022] The segregated waste collection system 10 according to the invention comprises a waste collection vehicle 12, an intermediate size container 14 and a divided cart 16. In typical operation, the divided cart 16 is filled with waste and is emptied into the intermediate size container 14, which can hold the waste from many divided carts. The contents of the intermediate size container are ultimately emptied into the waste collection vehicle 12.

[0023] The waste collection vehicle 12 comprises a waste storage container 18 having a divider wall 20, separating the waste storage container 18 into two compartments 22, 24. One of the compartments is can used to store recyclable materials and the other compartment preferably stores non-recyclable materials. A hopper 26, on the top of the waste storage container 18, provides access to the first and second compartments 22 and 24 of the waste storage container 18.

[0024] The waste collection vehicle also comprises a hydraulic lift 27 for lifting the intermediate size container 14 from a fill position (FIG. 1) to a emptying position (FIG. 7), where the contents of the intermediate size container are emptied into the waste collection vehicle. The hydraulic lift 27 is preferably a pair of arms 28, which are rotatably mounted at one end to the waste collection vehicle for rotation about a first axis 29 and whose other end mounts to the intermediate size container 14. The end of the lift arms 28 mounting the intermediate size container include hydraulic actuators 30, which are adapted to rotate the intermediate size container about a second rotational axis 31.

[0025] Referring to FIG. 2, the divided cart 16 comprises a generally rectangular body 40 having a front wall 42, rear wall 44, opposing side walls 46 and 48 and bottom wall 49. A divider wall 50 extends between the front wall 42 and the rear wall 44 to divide the body 40 into first and second compartments 52 and 54.

[0026] A cover 56 is hingedly mounted to a handle 58, extending from the rear wall 44. The cover 56 is adapted to close the open top of the body 40. The rear wall 44, side walls 46, 48 and bottom wall 49 all define an inset portion in which a wheel and axle assembly 60 is provided to aid in moving the divided cart 16. The front wall 42 defines an inset portion 62 across which spans a grab handle 64. An upper handle 66 is formed at the junction of a lip 68 and the inset portion 62.

[0027] The intermediate size container 14 comprises a first compartment 70 and second compartment 72, which are defined by a pair of spaced containers 74 and 76. Each of the containers has a front wall 78, 80, rear wall 82, 84, exterior side walls 86, 88 and interior side walls 90, 92, which effectively define a dividing wall between the first and second compartments 70 and 72. The containers are connected at the lower portion of the interior dividing walls 90 and 92.

[0028] A lift mechanism 98 is provided on the front walls 78, 80 and comprises a first lifting plate 100, which has a portion that spans the divider wall between the first and second container 74 and 76. Spaced support arms 102, 104, and 106 pivotally mount the first lifting plate 100 to the intermediate size container 14 by pivotally mounting one end to the rear of the first lifting plate and the other end pivotally mounted to the front walls 78, 80. A hydraulic actuator 108 is mounted to the front wall 78 and to the first lifting plate 100 to rotate the first lifting plate 100 about the pivotal connection of the arms 102, 104, 106 to the front walls 78, 80.

[0029] Similarly, a second lifting plate 10 is pivotally mounted to the front wall 80 through spaced support arms 112 and 114. A hydraulic actuator 116 is adapted to rotate the second lifting plate 110 relative to the front walls 78 and 80.

[0030] Multiple saddles 118a, 120aand 122aare provided on the first and second lifting plates 100110 and are adapted to engage the upper handle 66 of the divided cart 16 to lift the cart as the lifting plates 100, 110 are raised. Multiple rotatable lower respectively, are also disposed on the lifting plates 100 and 110 The lower cart hooks 118b, 120b, 122brotate to engage the grab handle 64 of the cart to prevent the cart from sliding off the lift when the cart is in the inverted position.

[0031] The three saddles 118a, 120a, 122aprovide additional functionality to the lift mechanism 98. The saddle 118 is positioned on the first lifting plate 100 so that both compartments 52 and 54 of the divided cart 16 will be aligned with the first compartment 70 of the intermediate size container 14. Similarly, the third saddle 122ais positioned on the second lift 110 so that the first and second compartments 52, 54 of the divided cart 16 will be aligned with the second compartment 72 of the intermediate size container 14. The saddle 120a, provided on the first lifting plate 10, is substantially in line with the divider wall of the intermediate size container 14 so that the first compartment 52 of the divided cart 16 is aligned with the first compartment 70 of the intermediate size container and the second compartment of the divided cart 16 is aligned with the second compartment of the intermediate size container 14. The several saddles provide for the emptying of the entire contents of the divided cart 16 into one of the compartments of the intermediate size container or segregating the contents of the divided cart 16 into the corresponding compartments of the intermediate size container. This increased functionality is very useful and advantageous in that not all users of the divided divided cart 16 separate their waste into recyclable and non-recyclable. Further, two undivided carts can be dumped simultaneously into the intermediate container 14 with the lift mechanism 98.

[0032] Referring to FIGS. 2-4, the intermediate size container 14 has a deflector assembly 130 comprising a pair of blades 132, 134. The blades 132, 134 have sharply angled leading edges 136, 138 and more gently angled trailing edges 140, 142. The trailing edges 140, 142 preferably have an increasing angle relative to the upper edge of the walls 90, 92. The increasing railing edge angle defines a tapered opening between the trailing edges 140, 142 to aid in positioning the divider 20 of the storage container 18 between the blades 132, 134 when the intermediate size container 14 is in the emptying position (FIG. 7)

[0033] The blades 132, 134 are preferably made from a flexible material, such as high density polyethylene (HDPE) and the like. The blades 132, 134 are mounted to the upper edge of the walls 90, 92 by threaded bolts (not shown) passing through the blades 132, 134 and walls 90, 92, respectively, with nuts threaded on the end of the bolts. Any other suitable fastener can also be used, such as mechanical fasteners. Preferably, the blades 132, 134 are removably mounted for easy replacement.

[0034] In operation, a divided cart 16 containing, for example, recyclable material in one compartment and non-recyclable material in another compartment is moved to the leading position by wheeling the intermediate size container 14 mounted to the waste collection vehicle 12 with the intermediate size container in the fill position. The cover 56 is then opened and the divided cart 16 is placed on the lift mechanism 98 so that the cart hook 120bis received within the inset 62 and engages the grab handle 64. The lift mechanism 98 is then actuated so that the first lifting plate 100 pivots about the hinge connection between the support arms 102, 104, 106 and the front walls 78, 80 until the divided cart 16 is partially inverted (emptying position) and the divider wall 50 of the divided cart aligns with the peak of the deflector blades 132, 134. As the contents from the first compartment 52 and second compartment 54 of the divided cart 16 empty into the corresponding first compartment 70 and second compartment 72 of the intermediate size container 14, the deflectors will deflect any waste adjacent the divider wall of the container cart into the appropriate compartment of the intermediate size container 14. This process is repeated for multiple divided carts until the intermediate size container 14 is full or it is desired to empty the contents of the intermediate size container into the waste collection vehicle 12.

[0035] Although only the description of a divided cart containing segregated waste has been described, the process for emptying a divided cart with both compartments filled with a single type of waste is similar to that described above except that the divided cart is mounted to the cart hook 118bor 120bas appropriate.

[0036] To empty the contents of the intermediate size container 14 into the waste collection vehicle 12, the hydraulic lift 26 of the waste collection vehicle 12 is actuated so that the arms 28 are rotated about rotational axis 29 and the divided cart is lifted towards the hopper 27 and partially inverted. As the intermediate size container 14 is moved to a partially inverted position (the emptying position), the divider wall 20 is received between the trailing edges 140, 142 of the blades 132, 134, effectively sealing the divider wall of the intermediate size container 14 relative to the divider wall 20 of the storage container 18. The tapered opening defined by the trailing edges of the blades helps to ensure the divider wall 20 is received between the blades because the intermediate size container 14 is often jostled side-to-side in response to the non-steady movement of the arms 28.

[0037] Typically, the divider wall 20 is knife-edged so that as it is received in the tapered opening between the blades 132, 134, the divider wall deflects the blades to a greater distance as the intermediate size container is inverted. The divider wall 20 effectively “un-zips” the blades, with each blade being positioned on an opposite side of the divider wall 20 to function as a seal between and deflector for the aligned compartments 70, 22 and 72, 24 of the intermediate size container and storage container. The resiliency of the blades 132, 134 permits the blades 132, 134 to resiliently spread as the divider wall is forced in-between the blades 132, 134.

[0038] In the partially inverted position (emptying position), the first and second compartments, 70, 72 of the intermediate size container 14 align with the first and second compartments 22, 24 of the waste storage container 18, respectively, and the contents of the intermediate size container compartments empty into the aligned compartments of the waste storage container 18. The hydraulic actuators 30 are then actuated to further invert the intermediate size container 14 to ensure complete transfer of the contents from the intermediate size container 14 into the waste storage container 18.

[0039] After the contents of the intermediate size container 14 have been emptied into the waste storage container 18, the intermediate size container 14 is lowered back toward the ground by reversing the direction of rotation of the lift arms 28 of the hydraulic lift 26. As the intermediate size container 14 is lowered, the blades 132, 134 flex back to their original position where they form a triangular deflector for the divided cart 16.

[0040] An advantage of the segregated waste collection system according to the invention is that the design and operation of the divided cart 16 is simplified with a single cover, especially when the divided cart 16 has more than two compartments.

[0041] FIG. 8 illustrates an alternative embodiment of the invention wherein like numerals will be used to identify like parts. Alternative deflectors 162 comprise opposed deflector plates 164, 166 each of which have longitudinal supports 165, 167 and are pivotally mounted to interior side walls 90, 92 by hinges 168, 170, respectively. Deflector plate 166 is rigidly mounted to a lever arm 178 through a hinge pin 174. Likewise, deflector plate 164 is rigidly mounted to lever arm 176 through a hinge pin 172. The hinge pins 172, 174 are pivotally mounted in sockets in the hinges 168 and 170 for pivotal movement of the deflector plates 164, 166 with respect to the walls 90, 92. The lever arms 176, 178 are mounted at other end to actuators 180, 182, respectively. The actuators 180, 182 are preferably pneumatic actuators, although any suitable type of actuator can be used.

[0042] The actuators 180, 182 rotate the lever arms 176, 178 to move the deflector plates 164, 166 from their filling position (FIG. 8), in which their upper ends meet to form an inverted V-shaped deflector, to an emptying position (FIG. 9), in which the deflectors 162, 164 are rotated away from each other.

[0043] The operation of the segregated waste collection system using the alternative deflectors is substantially identical as described above with the preferred deflectors. The only difference is that as the intermediate size container is moved from the fill position to the emptying position, the deflector plats 164, 166 must be moved from their fill position (FIG. 8) to their emptying position (FIG. 9) by actuation of the actuators 180, 182. The actuators are preferably actuated by a proximity switch encountered by the lift arms 28 as they are rotated. However, any suitable way can be used to automatically or manually actuate the actuators 180, 182.

[0044] FIGS. 10 and 11 illustrate a second embodiment of the divided cart 16. Like numbers will be used to identify like numbers of the segregated waste collection system 10 when describing the alternative cart 190. The alternative cart 190 is substantially identical to the divided cart 16 except that the single cover 56 of the divided cart 16 is replaced by multiple covers 192, 194 corresponding to each of the compartments 52 and 54. The covers 192 and 194 are hingedly mounted to the divider wall 50.

[0045] The operation of the segregated waste collection system with the alternative cart 190 is substantially identical as described above for the preferred divided cart 16, except that the covers 192 and 194 are not opened prior to lifting the cart 190. Instead, the covers 192 and 194 remained closed as the cart 190 is lifted to the partially inverted position. As the cart 190 moves to the partially inverted position, the covers 192 and 194 will rotate to open under the force of gravity and lie against the deflectors on the intermediate size container 14 as best illustrated in FIG. 1. When the cart is in the partially inverted position, the covers 192 and 194 supplement the deflective fiction of the deflectors.

[0046] While particular embodiments of the invention have been shown, it will be understood that the invention is not limited thereto since modifications may be made by those skilled in the art particularly in light of the foregoing teachings. Reasonable variation and modification are possible within the scope of the foregoing disclosure of the invention without departing from the spirit of the invention.