DYNAMIC PROCESSING OF OBJECTS PROVIDED IN ELEVATED VEHICLES WITH EVACUATION SYSTEMS AND METHODS FOR RECEIVING OBJECTS

Abstract

A system is disclosed for receiving a plurality of objects from an elevated trailer of a tractor trailer. The system includes a collection conveyor extending between a base end and a coupled end, the coupled end being rotatably coupled to an evacuation conveyor, said collection conveyor including an object facing surface between the base end and the coupled end for receiving the plurality of objects, said collection conveyor being rotatably adjustable with respect to the evacuation conveyor at the coupled end, and both the evacuation conveyor and the coupled end of the collection conveyor being elevationally adjustable.

Claims

1.-40. (canceled)

41. A method of evacuating a trailer of a tractor trailer, said method comprising: moving a coupled end of a collection conveyor upward, said coupled end of the collection conveyor being coupled to an evacuation conveyor; rotating a base end of the collection conveyor in a first rotational direction with respect to the coupled end of the collection conveyor such that first surface of the collection conveyor faces a plurality of objects to be removed from the trailer of the tractor trailer; contacting the plurality of objects with the first surface of the collection conveyor; and activating the first surface of the collection conveyor to move the plurality of objects along the collection conveyor toward the evacuation conveyor.

42. The method of claim 41, wherein the method further includes rotating the base end of the collection conveyor in a second rotational direction with respect to the coupled end of the collection conveyor while the plurality of objects is being received by the collection conveyor, the second rotational direction being opposite the first rotational direction.

43. The method of claim 41, wherein the method further includes attaching the base end of the collection conveyor to an anchor area proximate a floor of the trailer and the rear of the tractor trailer.

44. The method of claim 41, wherein the method further includes detecting force against the collection conveyor and providing collection conveyor force data.

45. The method of claim 44, wherein the method further includes adjusting an elevation of the trailer of the tractor trailer responsive to the collection conveyor force data.

46. The method of claim 41, wherein the method further includes changing an elevation of the evacuation conveyor and the coupled end of the collection conveyor.

47. The method of claim 41, wherein the evacuation conveyor includes an elevation system that elevationally adjusts the evacuation conveyor together with the coupled end of the collection conveyor.

48. The method of claim 47, wherein the evacuation conveyor includes a ramp section that couples with a facilities conveyor, the ramp section providing an elevation drop to the facilities conveyor.

49. The method of claim 48, wherein the method further includes dynamically engaging the facilities conveyor with the ramp section using a dynamic engagement assembly as the evacuation conveyor is raised and lowered.

50. The method of claim 49, wherein the dynamic engagement assembly includes rollers, and wherein the ramp section includes a tapered width that narrows toward the facilities conveyor.

51. A method of evacuating a trailer of a tractor trailer, said method comprising: coupling a coupled end of a collection conveyor to an evacuation conveyor; rotating a base end of the collection conveyor in a first rotational direction with respect to the coupled end of the collection conveyor such that first surface of the collection conveyor faces a plurality of objects to be removed from the trailer of the tractor trailer; contacting the plurality of objects with the first surface of the collection conveyor; activating the first surface of the collection conveyor to move the plurality of objects along the collection conveyor toward the evacuation conveyor; and rotating the base end of the collection conveyor in a second rotational direction with respect to the coupled end of the collection conveyor while the plurality of objects is being received by the collection conveyor, the second rotational direction being opposite the first rotational direction.

52. The method of claim 51, wherein the method further includes attaching the base end of the collection conveyor to an anchor area proximate a floor of the trailer and the rear of the tractor trailer.

53. The method of claim 51, wherein the method further includes detecting force against the collection conveyor and providing collection conveyor force data.

54. The method of claim 53, wherein the method further includes adjusting an elevation of the trailer of the tractor trailer responsive to the collection conveyor force data.

55. The method of claim 51, wherein the method further includes changing an elevation of the evacuation conveyor and the coupled end of the collection conveyor.

56. The method of claim 51, wherein the evacuation conveyor includes an elevation system that elevationally adjusts the evacuation conveyor together with the coupled end of the collection conveyor.

57. The method of claim 56, wherein the evacuation conveyor includes a ramp section that couples with a facilities conveyor, the ramp section providing an elevation drop to the facilities conveyor.

58. The method of claim 57, wherein the method further includes dynamically engaging the facilities conveyor with the ramp section using a dynamic engagement assembly as the evacuation conveyor is raised and lowered.

59. The method of claim 58, wherein the dynamic engagement assembly includes rollers, and wherein the ramp section includes a tapered width that narrows toward the facilities conveyor.

60. A trailer unloading system for unloading a plurality of objects from a trailer of a tractor trailer, said trailer unloading system comprising: a collection conveyor including a base end and an opposite coupling end, the coupling end for pivotally coupling to an evacuation conveyor, the collection conveyor including a first surface on which objects are to be transported to the evacuation conveyor; an elevation system that permits the coupling end of the collection conveyor to be elevated relative the base end of the collection conveyor such that the first surface of the collection conveyor faces the plurality of objects in the trailer of the tractor trailer; and an activation system for activating the collection conveyor to move the plurality of objects along the first surface of the collection conveyor toward the evacuation conveyor.

61. The system of claim 60, wherein the collection conveyor spans a width of the trailer of the tractor trailer.

62. The system of claim 60, wherein the collection conveyor is rotatable with respect to the evacuation conveyor to provide an angle with respect to horizontal of between a first angle of about 5 degrees and a second angle about 95 degrees.

63. The system of claim 62, wherein the collection conveyor spans a height of the trailer of the tractor trailer when rotated to the second angle.

64. The system of claim 60, wherein said coupled end of the collection conveyor is higher in elevation than the base end of the collection conveyor when the collection conveyor initially engages the plurality of objects in the trailer of the tractor trailer.

65. The system of claim 60, wherein the collection conveyor includes an active belt conveyor.

66. The system of claim 60, wherein the collection conveyor includes an active roller conveyor.

67. The system of claim 60, wherein the evacuation conveyor includes an elevation system that elevationally adjusts the evacuation conveyor together with the coupled end of the collection conveyor.

68. The system of claim 60, wherein the evacuation conveyor includes a ramp section that couples with a facilities conveyor, the ramp section providing an elevation drop to the facilities conveyor.

69. The system of claim 68, wherein the system includes a dynamic engagement assembly such that the ramp section may dynamically engage the facilities conveyor as the evacuation conveyor is raised and lowered.

70. The system of claim 69, wherein the dynamic engagement assembly includes rollers, and wherein the ramp section includes a tapered width that narrows toward the facilities conveyor.

71. The system of claim 60, wherein the system further includes at least one upper trailer engagement perception unit directed toward an upper area of the plurality of objects.

72. The system of claim 60, wherein the system further includes at least one lower trailer engagement perception unit directed toward a lower area of the plurality of objects.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The following description may be further understood with reference to the accompanying drawings in which:

[0011] FIG. 1 shows an illustrative diagrammatic view of a system for elevating a trailer of a tractor trailer in accordance with an aspect of the present invention;

[0012] FIG. 2 shows an illustrative diagrammatic view of the system of FIG. 1 additionally showing an object collection system in accordance with a further aspect of the present invention;

[0013] FIG. 3 shows an illustrative diagrammatic front view of a tractor trailer in an elevation station in accordance with an aspect of the present invention;

[0014] FIG. 4 shows an illustrative diagrammatic rear view of the tractor trailer of FIG. 3 showing a portion of the evacuation system in accordance with an aspect of the present invention;

[0015] FIG. 5 shows an illustrative diagrammatic enlarged view of an engagement side of a collection conveyor of the evacuation system of FIG. 2;

[0016] FIG. 6 shows an illustrative diagrammatic view of the back side of the collection conveyor of FIG. 5;

[0017] FIG. 7 shows an illustrative diagrammatic enlarged view of an engagement side of a collection conveyor that includes cleats in accordance with an aspect of the present invention;

[0018] FIG. 8 shows an illustrative diagrammatic enlarged view of an engagement side of a collection conveyor that includes rollers in accordance with a further aspect of the present invention;

[0019] FIG. 9 shows an illustrative diagrammatic view of the evacuation system of FIG. 2 prior to engagement with the trailer of the tractor trailer;

[0020] FIG. 10 shows an illustrative diagrammatic view of the evacuation system of FIG. 2 upon engagement with the trailer of the tractor trailer;

[0021] FIG. 11 shows an illustrative diagrammatic view of the evacuation system of FIG. 2 upon engagement with the trailer of the tractor trailer with the trailer elevated;

[0022] FIG. 12 shows an illustrative diagrammatic view of the evacuation system of FIG. 2 upon engagement with the trailer of the tractor trailer showing objects being evacuated from the elevated trailer;

[0023] FIG. 13 shows an illustrative diagrammatic side view of the evacuation system of FIG. 4 upon engagement with the trailer of the tractor trailer;

[0024] FIG. 14 shows an illustrative diagrammatic side view of the evacuation system of the evacuation system of FIG. 4 upon engagement with the trailer of the tractor trailer with the trailer elevated;

[0025] FIG. 15 shows an illustrative diagrammatic side view of the evacuation system of FIG. 4 upon engagement with the trailer of the tractor trailer showing objects being evacuated from the elevated trailer;

[0026] FIG. 16 shows an illustrative diagrammatic side view of the evacuation system of FIG. 4 upon engagement with the trailer of the tractor trailer showing objects being evacuated from the elevated trailer with the collection conveyor having been lowered as objects are removed from the trailer;

[0027] FIG. 17 shows an illustrative diagrammatic elevated side view of an evacuation conveyor of the evacuation system of FIG. 2;

[0028] FIG. 18 shows an illustrative diagrammatic elevated side view of an evacuation conveyor of the evacuation system of FIG. 2 in an elevated position;

[0029] FIG. 19 shows an illustrative diagrammatic view of a ramp section of the evacuation system of FIG. 2 in an elevated position; and

[0030] FIG. 20 shows an illustrative diagrammatic view of the ramp section of FIG. 19 in a lowered position.

[0031] The drawings are shown for illustrative purposes only.

DETAILED DESCRIPTION

[0032] In accordance with various aspects, the invention provides a processing system in which a plurality of objects are received from an elevated trailer of a tractor trailer. With reference to FIG. 1, the system includes a vehicle elevation system 10 that includes a vehicle lift plate 12 attached at a first end via cables 14 over a frame 16 to a large counterweight 18. The cables 14 travel through a movement control system 19 that may control (e.g., stop, slow or actively power) movement of the cables 14. In cooperation with the counterweight 18, the control system 19 controls the lifting and lowering of the trailer. In accordance with various embodiments, the system may be designed to lift either a trailer alone (decoupled from the tractor and using a smaller counterweight) or both the tractor and trailer as shown. A protective barrier 20 is provided around the area below the counterweight 18, and the frame 16 is sufficiently large to accommodate the movement and positioning of a tractor trailer vehicle 22 below the frame 16. A small vehicle ramp 24 and lift stop blocks 26 are provided at the first end of the vehicle lift plate 12. The lift stop blocks 26 remain engaged until the system is ready to lift the vehicle as discussed below. The vehicle lift plate 12 also includes a front wheel chock block receiving area 28 for receiving a front wheel chock block and includes a fixed rear wheel chock block 30. The vehicle lift plate 12 is attached at a second end that is opposite the first end to a lift plate pivot system 32.

[0033] With further reference to FIG. 2, the tractor trailer vehicle 22 is positioned to be pulled forward toward the protective barrier 20 such that it may be backed up through an opposite end of the frame 16 onto the vehicle lift plate 12. An evacuation system 40 is also provided for receiving a plurality of objects as discussed in more detail below, and the operation of the systems described herein may be controlled (e.g., wirelessly or by a wired network) by one or more computer processing systems 100. The tractor trailer vehicle 22 may be backed up over the ramp 24 onto the vehicle lift plate 12 as shown in FIG. 3. A front wheel chock block 38 is then placed in the block receiving area 28 behind the tractor as further shown in FIG. 4, and the rear doors 36 of the trailer 34 are fastened open, exposing the objects 35 within the trailer 34.

[0034] The system 40 includes a collection conveyor 42 with a base end 44 and a coupled end 46 that is rotationally coupled to an evacuation conveyor 76 as shown in FIGS. 5 and 6. The collection conveyor 42 of FIGS. 5 and 6 includes a conveyor belt 50 providing an object facing surface 52 and a backside surface 54. The collection conveyor 42 also includes force detection units 56 on either vertical side of the collection conveyor 42, with force transfer beams 58 extending between pairs of force detection units 56 inside the belt 50. The rollers (e.g., one or both of which are actively powered) at the ends (base end and coupled end) that provide the belt conveyor movement are also mounted on force detection units 56.

[0035] The collection conveyor 42 includes a pair of magnets 60 (e.g., permanent magnets or selectively controlled electromagnets) at the base end of the collection conveyor 42. The magnets 60 are provided on side beams 62 and the magnets 60 facilitate positioning of the collection conveyor within the trailer as discussed in more detail below. The side beams also include upper perception units 64 and lower perception units 66 on the object facing side of the collection conveyor 42, as well as assessment perception units 68 on the backside of the collection conveyor 42 that is opposite the collection side. The assessment perception units 68 facilitate assessment of a load of objects within a trailer prior to engagement and assist in guiding the system 40 toward the end of a trailer. The upper trailer engagement perception units 64 assist in monitoring locations and positions of objects in an upper area of the trailer, while the lower trailer engagement perception units 66 assist in monitoring locations and positions of objects in a lower area of the trailer. The force transfer beams 58 facilitate monitoring a load on the collection conveyor 42 (e.g., on the object facing side thereof) during engagement with a trailer. The belt 50 runs over the outer surfaces of the force transfer beams 58 and transfer a force thereon directed to the force detection units 56.

[0036] The collection conveyor 42 is pivotally mounted to the evacuation conveyor 76 at the coupled end 46 that includes a pivot coupling mounted on force torque sensors 70 for detecting any forces acting on the pivot coupling. The evacuation conveyor 76 (e.g., a roller conveyor as shown or a belt conveyor) includes one or more evacuation conveyor engagement perception units 72 for perceiving data regarding any visible regions within the trailer (depending on a position of the collection conveyor) as well as data regarding objects being moved onto the evacuation conveyor 46 from the collection conveyor 42.

[0037] The system therefore includes a collection conveyor extending between a base end and a coupled end, the coupled end being rotatably coupled to an evacuation conveyor in accordance with an aspect of the invention. The collection conveyor includes an object facing surface between the base end and the coupled end for receiving the plurality of objects. The collection conveyor is rotatably adjustable with respect to the evacuation conveyor at the coupled end, and both the evacuation conveyor and the coupled end of the collection conveyor are elevationally adjustable.

[0038] With reference to FIG. 7, in accordance with another aspect of the present invention, the system 40 includes a collection conveyor 42 with a conveyor belt 50 that includes cleats 51 (a cleated conveyor). The collection conveyor 42 similarly includes base end 44 and a coupled end 46 that is rotationally coupled to an evacuation conveyor 76, as well as an object facing surface 52 and a backside surface. The collection conveyor 42 also similarly includes force detection units 56 on either vertical side of the collection conveyor 42, with force transfer beams 58 extending between pairs of force detection units 56 inside the cleated belt 50. Again, the rollers (e.g., one or both of which are actively powered) at the ends (base end and coupled end) that provide the belt conveyor movement are also mounted on force detection units 56.

[0039] The collection conveyor 42 similarly includes a pair of magnets 60 (e.g., permanent magnets or selectively controlled electromagnets) at the base end of the collection conveyor 42. The magnets 60 are provided on side beams 62 and facilitate positioning of the collection conveyor within the trailer. The side beams also include upper perception units 64 and lower perception units 66 on the object facing side of the collection conveyor 42, as well as assessment perception units 68 on the backside of the collection conveyor 42 that is opposite the collection side. The assessment perception units 68 facilitate assessment of a load of objects within a trailer prior to engagement and assist in guiding the system 40 toward the end of a trailer. The upper trailer engagement perception units 64 assist in monitoring locations and positions of objects in an upper area of the trailer, while the lower trailer engagement perception units 66 assist in monitoring locations and positions of objects in a lower area of the trailer. The force transfer beams 58 facilitate monitoring a load on the collection conveyor 42 (e.g., on the object facing side thereof) during engagement with objects within a trailer. The conveyor belt 50 runs over the outer surfaces of the force transfer beams 58 and transfer a force thereon directed to the force detection units 56.

[0040] In accordance with another aspect of the present invention, the system 40 includes a collection conveyor 42 with a plurality of rollers 53 as shown in FIG. 8. The collection conveyor 42 similarly includes base end 44 and a coupled end 46 that is rotationally coupled to an evacuation conveyor 76, as well as an object facing surface 52 and a backside surface. The collection conveyor 42 also similarly includes force detection units 56 on either side of the rollers 53 (on which the rollers are mounted).

[0041] The collection conveyor 42 similarly includes a pair of magnets 60 (e.g., permanent magnets of selectively controlled electromagnets) at the base end of the collection conveyor 42. The magnets 60 are provided on side beams 62 to facilitate positioning within the trailer. The side beams also include upper perception units 64 and lower perception units 66 on the object facing side of the collection conveyor 42, as well as assessment perception units 68 on the backside of the collection conveyor 42 that is opposite the collection side. The assessment perception units 68, the upper trailer engagement perception units 64, and the lower trailer engagement perception units 66 function as discussed above.

[0042] Again, the collection conveyor 42, 42 is pivotally mounted to the evacuation conveyor 46 at the coupled end 46 that includes a pivot coupling mounted on force torque sensors 70 for detecting any forces acting on the pivot coupling. The evacuation conveyor 76 (e.g., a roller conveyor as shown or a belt conveyor) includes one or more evacuation conveyor engagement perception units 72 for perceiving data regarding any visible regions within the trailer (depending on a position of the collection conveyor) as well as data regarding objects being moved onto the evacuation conveyor 46 from the collection conveyor 42, 42. As discussed in more detail herein, the collection conveyors 42 and 42 may be used with any of the systems discussed herein with reference to collection conveyor 42.

[0043] With reference to FIG. 9, the evacuation conveyor 76 is supported by extendable support legs 74 (mounted on wheels). The evacuation conveyor 46 is then elevated (on the extendable support legs 74) such that it is close to the elevation of the top of the trailer 34 of the tractor trailer vehicle 22. The collection conveyor 72 is then rotated about the coupled end 46 pivot mounting with respect to the evacuation conveyor 76 such that the object facing surface faces the objects 35 in the trailer 34, and the backside 54 faces away from the trailer 34. With further reference to FIG. 10, the system 40 is moved (on the support wheels) toward the trailer 34 of the tractor trailer vehicle 22 and engages the objects in the trailer on the object facing surface of the collection conveyor 42. The magnets 60 on the ends of the side beams 62 then engage the floor 33 of the inside of the trailer 34, preferably with the side beams 62 standing vertical on the floor, maximizing the contact surface between the magnets 60 and the floor 33. In the event that the trailer 34 is not full such that objects are directly engaged with the collection conveyor 42, the collection conveyor is still engaged with the floor of the interior of the trailer 34 near the end of the trailer (e.g., with the side beams 62 being perpendicular to the floor 33).

[0044] Once the collection conveyor 42 is engaged within the trailer 42, the lift stop blocks 26 are disengaged from the vehicle lift plate 12 as shown in FIG. 10. The movement control system 19 (discussed above with reference to FIGS. 1 and 2) may then release a hold on movement of the cables, permitting the vehicle lift plate to be raised as shown in FIG. 11 with the tractor trailer vehicle 22 on the vehicle lift plate 12. The collection conveyor 42 adjusts as the tractor trailer vehicle 22 is being elevated (as discussed in more detail below), and the collection conveyor 42 holds the objects within the trailer 34 until the system is ready to unload the objects in a controlled fashion. To unload the objects, the system 40 moves the coupled end 46 of the collection conveyor (and the evacuation conveyor 76) a small distance away from the trailer 34 (as shown in FIG. 12), and eventually moves the coupled end 46 of the collection conveyor and the evacuation conveyor 76 lower toward the ground as objects are removed from the trailer.

[0045] Prior to lifting, the magnets 60 are engaged with the floor 33 of the inside of the trailer and the position of the evacuation conveyor 76 is adjusted to position the collection conveyor 42 to be approximately perpendicular to the floor 33 of the trailer 34. With the magnets seated against the floor of the trailer at the outset of the trailer lifting, the collection conveyor should have a reduced chance of sliding on the floor toward the end of the trailer. As the trailer is lifted, the base end of the collection conveyor may move away from the vertical position with respect to the trailer floor such that the collection conveyor 42 and the interior floor of the trailer should form an obtuse angle, facilitating maintaining the base of the collection conveyor within the trailer. Two points of rotation are therefore potentially at play.

[0046] For example, FIG. 13 shows that the vehicle lift plate 12 (and the vehicle 22 including the trailer 34 thereon) will pivot about an axis (labelled a) within the lift plate pivot system 32. As the collection conveyor 42 pivots with respect to its base end 44 that includes the magnets 60, the collection conveyor 42 may pivot about an axis (labelled b) within the trailer 34. The coupled end 46 of the collection conveyor therefore may pivot about both axes a and b. The radius of the pivot with respect to axis a is shown at r.sub.a and the radius of the pivot with respect to axis b is shown at r.sub.b in FIG. 13. The potential angle of movement of the coupled end 46 with respect to axis a is shown as an angle ? and the potential angle of movement of the coupled end 46 with respect to axis b is shown as an angle ? in FIG. 14. The resulting movement vector may be given by the chord equations c.sub.?=4r Sin (?/2) and c.sub.?=4r Sin (?/2), each including vertical components and horizontal components. Knowing these general values, the system may accommodate the lifting of the vehicle by moving the elevated conveyor 76 in both vertical and horizontal directions as the vehicle is lifted to ensure that the collection conveyor 42 remains properly positioned within the trailer. The force sensors 56 and 70 are also monitored to ensure that the collection conveyor is not receiving too much force against it from the objects within the trailer, and the perception units 62, 64, 66 and 72 are monitored to confirm that the anticipated movement occurs.

[0047] In accordance with certain aspects therefore, the invention provides a system for receiving a plurality of objects from an elevated trailer of a tractor trailer, and the system includes a collection conveyor extending between a base end and a coupled end. The collection conveyor is adapted to retain the plurality of objects within the tractor trailer when the collection conveyor is in a first position with respect to the tractor trailer, and to permit the plurality of objects to travel up the collection conveyor when the collection conveyor is in a second position with respect to the tractor trailer.

[0048] As the elevation of objects within the trailer is reduced, the coupled end 46 of the collection conveyor 42 is lowered to facilitate the removal of objects. FIG. 15 shows a side view of the collection conveyor 42 at an elevated position reviewing objects from a fully loaded trailer 34, while FIG. 16 shows the collection conveyor 42 at a lowered position reviewing objects from the trailer 34 when it is less loaded. The evacuation conveyor 76 includes the extendable support legs 74 as discussed above, as well as a ramp section 80 that is pivotally coupled to the evacuation conveyor 76 by a pivot coupling 78, as well as a dynamic engagement assembly 84 for dynamically engaging a facilities conveyor 82 as shown in FIG. 17. FIG. 17 shows the evacuation conveyor 76 at an elevated position facilitating removal of objects, and FIG. 18 shows the evacuation conveyor 76 (and the coupled end 46) at a lowered position while continuing to facilitate removal of objects from the trailer.

[0049] With further reference to FIG. 19, the ramp section 80 that is pivotally coupled (passively) at 78 to the elevation conveyor 76. The evacuation system includes a ram section that has a tapered width, bringing the objects into a smaller width conveyance for the facilities conveyor 82. The ramp section 80 also includes a dynamic engagement system 82 that permits the lower end of the ramp section to travel along (e.g., by wheels in a track) the facilities conveyor 82. FIG. 19 shows the evacuation conveyor 76 elevated (with the upper end of the ramp section 80), and FIG. 20 shows the evacuation conveyor lowered, wherein the dynamic engagement system 82 provides that the ramp section travels along the facilities conveyor 82 to ensure that objects are deposited onto the facilities conveyor 82.

[0050] In accordance with further aspects therefore, the invention provides a method of receiving a plurality of objects from an elevated trailer of a tractor trailer. The method includes urging a collection conveyor against the plurality of objects in the trailer from a rear of the trailer, providing the elevated trailer such that the rear of the trailer is lower than a front of the trailer, retaining the plurality of objects within the trailer with the collection conveyor, lowering an upper portion of the collection conveyor, and permitting the plurality of objects to move upward along the collection conveyor to an evacuation conveyor, with further processing toward a facilities conveyor via a ramp section and dynamic engagement system.

[0051] The invention further provides in accordance with further aspects, a system for emptying contents of a trailer of a tractor trailer. The system includes an elevation system for elevating a front end of the trailer with respect to a rear end of the trailer, a collection conveyor for receiving objects from the elevated trailer and for controlling a rate of removal of objects from the elevated trailer, and an evacuation conveyor pivotally coupled to the collection conveyor for receiving the objects from the collection conveyor.

[0052] Those skilled in the art will appreciate that numerous modifications and variations may be made to the above disclosed embodiments without departing from the spirit and scope of the present invention.