Abstract:
A reduced-weight poultry cage is used in conjunction with a reduced-weight trailer to transport live poultry for maximizing the poundage of poultry being transported while reducing the number of trips and fuel expenses. The poultry cage includes a combination of aluminum and plastic elements that reduce cage weight, provide for nesting of cages in stacks as well as easy replacement of failed parts. Furthermore, a drop-deck aluminum trailer with a reduced floor and guide rail alignment stops allows for a durable yet lightweight trailer that can haul a plurality of stacks of these poultry cages, thereby maximizing cubic feet availability while being compliant with various road and bridge laws.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This non-provisional application claims the benefit under 35 U.S.C. §119(e) of both Application Ser. No. 61/788,916 filed on Mar. 15, 2013 entitled Reduced Weight Live Poultry 
     Hauling System and Application Ser. No. 61/861,534 filed on Aug. 2, 2013 entitled Integrated System for Transporting Live Poultry, and all of whose entire disclosures are incorporated by reference herein. 
    
    
     BACKGROUND OF THE INVENTION 
     The present invention relates to relates generally to techniques for transporting live poultry. 
     The U.S. Poultry industry grows their chickens in large houses or barns until the chickens reach market age and then transport the live birds to a slaughter plant by the means of cages on a flatbed trailer. Typical poultry cages are designed to be handled with fork lifts and dumped mechanically at the slaughter plant. The current system of transportation evolved over approximately 25 years ago and has changed very little over time. One of the problems with the current system is the tractor, trailer, cages and binding mechanism weigh approximately 48,000 pounds empty allowing a payload of only 31,000 pounds of live chickens. 
     Currently, the industry standard for transporting live poultry is a steel cage with two forklift sleeves separated with angle stretchers to form a rectangular base for the cage. The steel cage is constructed of square tubular posts, which are welded to each side of a base to segment the frame into compartment stacks. Horizontal square tubing is then positioned between the vertical post both longitudinal and transverse to provide support beams for the compartment floors. Additionally, a single sheet of fiberglass or un-reinforced plastic is positioned on the horizontal beams, which provide flooring for the compartments on each level. The cage roof is constructed from a single panel of galvanized sheet metal welded to the square tubing frame located around the perimeter of the top of the compartments. 
     Birds are retained in the individual compartments by wall panels constructed from small vertical wires secured by larger horizontal wires welded at crossing tangents at the top, bottom, and midpoint of the panels to form a grid. The frame panels are welded to the inside of the structural tubular frame. Frequent damage occurs when the forklift tines impact the wire grid panel and broken wires can be pushed inward causing injury to the birds until the panels are repaired. Typically, the panels are not repaired or replaced unless the birds are able to leave the cage through the damaged opening. Moreover, repairing such cages is difficult. 
     The door panels are extruded aluminum with round solid tubular like profiles incorporated in the top and bottom of the profile and extending longitudinally from one extremity to the other. The position of the door is controlled by a spring loaded mechanism, which consist of a bracket rigidly mounted to the door&#39;s far side extremity, to which is rotationally mounted a rod. The rotationally mounted rod protrudes through a slot in a bracket rigidly mounted to the inside face of one of the cage&#39;s adjacent tubular post. A spring is circumferentially positioned around the control rod and placed between the door bracket and the cage mounted bracket. The spring is mounted so the spring is loaded at the midpoint of the door&#39;s rotation and is relaxed as the pivot goes over center to close or open the door. 
     When accidentally struck by forklift tines, the aluminum door stays permanently bent. The bend in the door causes the mounting pin to jam in the receiving post and the control rod in its mounting. This causes the door to be fixed in the partially open position. The partially open doors are frequently torn loose during the close side-by-side loading on the transport trailer or unloading system. It is common practice to remove the door if repair is extensive and leave the compartment without a door and therefore an un-productive compartment. 
     Currently, metal cages weigh in excess of 900 pounds per cage. A truck carrying a normal load of 22 empty cages would include approximately nine tons of metal cages. The weight of the metal cages adds significantly to the transportation fuel cost for shipping poultry. Additionally transportation costs associated with shipping the empty metal cages are incurred with each poultry shipment because the poultry is typically only transported one way. 
     One solution to this problem is disclosed in U.S. Pat. No. 8,020,517 (Seay), which is owned by the same Assignee, namely, W. A. Crider, Jr., as the present application. In that invention, a plurality of stand-alone poultry cages are formed of plastic and then stacked inside a welded-together aluminum frame. Unfortunately, that invention suffers from several problems, including poor structural stability as well as cracking of the frame. 
     Thus, there remains a need for a poultry cage-trailer combination that together greatly reduces the weight of those components in order to maximize payload, i.e., live bird pounds, that combines good structural stability with durability and while complying with road and bridge laws. 
     All references cited herein are incorporated herein by reference in their entireties. 
     BRIEF SUMMARY OF THE INVENTION 
     A reduced weight poultry cage is disclosed. The cage comprises: an aluminum frame formed by a plurality of vertical members coupled to a base and each vertical member comprising a stack of floor supports; a plurality of aluminum flooring layers, each of the aluminum flooring layers being supported on a corresponding set of floor supports at a common elevation; a plurality of polymer panels that are coupled between adjacent or opposite floor supports at a common elevation on a corresponding floor layer to form a plurality of poultry compartments; and a respective compartment door positioned at one side of each poultry compartment on a common side of the cage. 
     A method of forming a reduced weight poultry cage is disclosed. The method comprises: (a) forming an aluminum frame using a plurality of vertical members coupled to a base; (b) securing a floor support to each one of said vertical members; (c) positioning an aluminum flooring layer on top of said floor supports; (d) positioning a plurality of polymer panels between adjacent floor supports and across oppositely-facing floor supports to form a plurality of poultry compartments on said aluminum flooring layer; (e) repeating steps (b)-(d) at least once to form at least a second plurality of poultry compartments; and (f) releasably securing a respective door to each one of said plurality of poultry compartments on a common side of said frame. 
     A trailer for conveying live poultry in cages and optimized to maximize payload while minimizing trailer weight is disclosed. The trailer comprises: a plurality of aluminum main beams arranged longitudinally along the length of the trailer; a pair of aluminum guide rails that run the length of the trailer, forming a respective side of the trailer, and coupled together via a plurality of aluminum cross members arranged transversely for connecting the guide rails together to form a frame structure that is secured to the plurality of main beams, and wherein the guide rails support at least one cage thereon and are adapted to engage a portion of the cage therein; a suspension assembly located at a rear portion of the trailer for supporting the frame structure and the plurality of aluminum main beams upon a plurality of wheel axle assemblies; and a floor secured only to a middle region of the frame structure along the length of the trailer. 
     A method for conveying live poultry in cages via trailer which is optimized to maximize payload while minimizing trailer weight is disclosed. The method comprises: providing a plurality of aluminum main beams arranged longitudinally along the length of the trailer; providing a pair of aluminum guide rails that run the length of the trailer to form a respective side of the trailer; coupling the aluminum guide rails together using a plurality of aluminum cross members arranged transversely for connecting the guide rails together to form a frame structure that is secured to the plurality of main beams; positioning a plurality of cage guide stops along the length of each of the guide rails for engaging portions of the cages; providing a suspension assembly located at a rear portion of the trailer for supporting the frame structure and the plurality of aluminum main beams upon a plurality of wheel axle assemblies; omitting a floor on the trailer except for a middle region of the frame structure along the length of the trailer; and positioning at least one cage on the guide rails so that portions of the at least one cage engage respective ones of the cage guide stops. 
     An integrated system for conveying live poultry in cages on a trailer and optimized to maximize payload while minimizing cage and trailer weight is disclosed. The system comprises: a reduced weight poultry cage comprising: an aluminum frame formed by a plurality of vertical members coupled to a base and each vertical member comprising a stack of floor supports; a plurality of aluminum flooring layers, wherein each of the aluminum flooring layers is supported on a corresponding set of floor supports at a common elevation; a plurality of polymer panels that are coupled between adjacent or opposite floor supports at a common elevation on a corresponding floor layer to form a plurality of poultry compartments; and a respective compartment door positioned at one side of each poultry compartment on a common side of the cage; and a reduced weight trailer for hauling at least one of the reduced weight poultry cages, wherein the trailer comprises: a plurality of aluminum main beams arranged longitudinally along the length of the trailer; a frame structure formed from a pair of aluminum guide rails coupled together via a plurality of aluminum cross members, wherein the frame structure is coupled to the main beams; and a suspension assembly located at a rear portion of the trailer for supporting the frame structure and the plurality of aluminum main beams upon a plurality of wheel axle assemblies. 
     A method of conveying live poultry in cages on a trailer and optimized to maximize payload while minimizing cage and trailer weight is disclosed. The method comprises: (a) forming an aluminum frame using a plurality of vertical members coupled to a base; (b) securing a floor support to each one of the vertical members; (c) positioning an aluminum flooring layer on top of the floor supports; (d) positioning a plurality of polymer panels between adjacent floor supports and across oppositely-facing floor supports to form a plurality of poultry compartments on the aluminum flooring layer; (e) repeating steps (b)-(d) at least once to form at least a second plurality of poultry compartments; and (f) releasably securing a respective door to each one of the plurality of poultry compartments on a common side of the frame; (g) loading poultry into each one the poultry compartments; (h) forming a reduced weight trailer for carrying at least one reduced weight poultry cage by coupling a frame structure, comprising a pair of aluminum guide rails coupled together by a plurality of aluminum cross members, to a plurality of aluminum main beams arranged longitudinally along the length of the trailer; and (i) coupling a suspension assembly to the main beams located at a rear portion of the trailer for supporting the frame structure and the main beams upon a plurality of wheel axle assemblies; and (j) loading the at least one reduced weight poultry cage containing the poultry onto the trailer. 
    
    
     
       BRIEF DESCRIPTION OF SEVERAL VIEWS OF THE DRAWINGS 
       Many aspects of the present disclosure can be better understood with reference to the following drawings. The components in the drawings are not necessarily to scale, emphasis instead being placed upon clearly illustrating the principles of the present disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views. 
         FIG. 1  is a perspective view of the front side of a poultry cage of the present invention showing a plurality of aluminum floors and with none of the doors or side wall panels installed; 
         FIG. 2  is a perspective view of the rear side diagram of the poultry cage of  FIG. 1  with none of the back walls installed; 
         FIG. 3  is a front plan view of the poultry cage of  FIGS. 1 and 2 ; 
         FIG. 4  is a side view of the poultry cage of  FIGS. 1 and 2 ; 
         FIG. 5  depicts the different floor support members; 
         FIG. 6A  are front and back views of a front corner strut showing the corresponding floor support members secured thereto and with the various flooring layers shown partially in phantom; 
         FIG. 6B  are front and back views of a vertical strut, for use along the sides or back side of the poultry cage, showing corresponding floor support members secured thereto and with the various flooring layers shown partially in phantom; 
         FIG. 7  is a plan view of a side wall panel for a compartment of the poultry cage; 
         FIG. 8  is a plan view of a back panel for a compartment of the poultry cage; 
         FIG. 9A  is a plan view of the inner side of a compartment door showing one example of a door closure mechanism, for example, strikeplates in the upper two corners that are magnetically-coupled by magnets; 
         FIG. 9B  is a partial isometric view of the front side of the poultry cage showing how three compartment doors are installed for their respective compartments; 
         FIG. 10  is a view of one of the back corners of the poultry cage of the present invention showing the side wall panels and the back wall panels installed for all of the compartments; 
         FIG. 11  depicts a partially-assembled poultry cage  20 A of the present invention, showing the floor supports secured in their respective vertical struts or corner struts for receiving a floor layer; 
         FIG. 12  is a diagram illustrating a less preferred winch system used to arrest movement of the poultry cages in accordance with an exemplary embodiment of the present disclosure; 
         FIG. 13  is a diagram illustrating a less preferred winch system of a cage stack when positioned on the transport trailer in accordance with an exemplary embodiment of the present disclosure; 
         FIG. 14  is a side view of a lightweight trailer in accordance with the present disclosure; 
         FIG. 15A  is an isometric view of the lightweight trailer in accordance with the present invention; 
         FIG. 15B  is a plan view of the lightweight trailer in accordance with the present invention; 
         FIG. 15C  is a side view of the lightweight trailer in accordance with the present invention; 
         FIG. 15D  is a partial underside isometric view of the lightweight trailer showing a one stack cages thereon with no side wall panels, back wall panels or doors shown; 
         FIG. 16  is a photograph of an embodiment of an improved poultry cage assembly and trailer setup with 24 poultry cages loaded on the trailer; 
         FIG. 16A  is an isometric view of the lightweight trailer showing a single stack of cages (e.g., two) secured on the lower deck of the trailer; 
         FIG. 16B  is a plan view of the trailer and single stack of cages of  FIG. 16A ; 
         FIG. 16C  is a side view of the trailer and single stack of cages of  FIG. 16A  shown with no side wall panels installed; 
         FIG. 16D  is an enlarged view of the single stack positioned on the trailer of  FIG. 16A  shown with no side wall panels installed; 
         FIG. 16E  is an enlarged view showing a cage alignment stop mounted on a guide rail of the trailer; 
         FIG. 16F  is similar to the view of  FIG. 16E  but showing a cage (also shown with no side wall panels installed) on the trailer with the cage alignment stop engaged with the corresponding cage member; 
         FIG. 16G  is an enlarged view showing how cages (also shown with no side wall panels installed), when stacked, also utilize their corresponding cage alignment stop members relative to one another; 
         FIG. 16H  is a partial isometric view of the safety frame located at the tail end of the trailer and using supplemental visual indicators for added safety; and 
         FIG. 17  depicts the components of a preferred ratchet mechanism for use on the present invention cage/trailer system to releasably secure the cage stacks to the trailer. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Referring now to the figures, wherein like reference numerals represent like parts throughout the several views, exemplary embodiments of the present disclosure will be described in detail. Throughout this description, various components may be identified having specific values, these values are provided as exemplary embodiments and should not be limiting of various concepts of the present invention as many comparable sizes and/or values may be implemented. 
     The present invention overcomes the problems of the prior art by establishing both a reduced weight poultry cage  20 A along with a corresponding reduced weight trailer  20 B for transporting a plurality of these reduced weight poultry cages  20 A thereon. 
     Reduced Weight Poultry Cage  20 A 
     The poultry cage  20 A of the present invention comprises an outer metal (e.g., aluminum) frame that is formed and stabilized by a plurality of floor layers  12 . Compartments (PC) for the poultry are formed on each floor layer  12  by installing side panels  24  ( FIG. 7 ) and back panels  26  ( FIG. 8 ) before the next floor layer  12  is installed.  FIG. 11  depicts a back corner of the poultry cage  20 A showing the side panels  24  and the back panels  26  installed. By way of example only, the poultry cage  20 A consists of three stacks ( FIG. 4 ) ST 1 -ST 3  of five levels; thus, once the side panels  24  and back panels  26  for each floor layer  22  are installed, the poultry cage  20 A comprises fifteen compartments for holding poultry. It should be understood that in order to form this number of compartments, side panels  24 A (also referred to as “internal wall panels”; see  FIG. 10 ) are also installed between vertical struts  32  (between the front and rear sides of the cage  20 A) on each floor layer  22 , and aligned with the lines  21 A and  21 B in  FIGS. 1-2 . A respective door  28  ( FIG. 9A ) for each compartment is located along the front side of the cage  20 A. As also shown in  FIG. 4 , forklift tine sleeves  29  are provided for at the base  31  of the poultry cage  20 A to permit the poultry cage  20 A to be lifted, tilted and/or set down. 
     Each floor panel or layer  22  is formed from a sheet of aluminum that is pressed to form the appropriate shape. It should be understood that the layer  22  is continuous from one cage side to the other cage side and from the front of the cage to the back of the cage. As shown in  FIGS. 1-2 , each floor panel or layers  22  features ridges or longitudinal ribs  30  that provide enhanced structural integrity to each floor panel  22 ; however, the ridges  30  are not raised enough for a chicken to grab hold when the cage  20 A is tilted on its side for dumping at a processing plant. Accordingly, by way of example only, the poultry cage  20 A comprises five support levels of solid one piece aluminum floors  22  that prevent a bird from using its toes to stay in the cage  20 A during a dumping process. Also, in an exemplary embodiment, each floor  22  has an open slot (not shown) allowing poultry manure to escape during loading and unloading of the cages  20 A. 
     As mentioned previously, the poultry cage  20 A comprises an outer metal (e.g., aluminum) frame. This frame is composed of a plurality of vertical struts  32  and corner struts  34  ( FIGS. 1-2 ) that, among other things, act as guideways for a plurality of floor supports (S 1 , S 2 , S 3  or S 4  as shown in  FIG. 5 ) that support each floor layer  22 . Each floor support (e.g., aluminum) not only acts as a floor support for a floor layer  22  (as well as spacers between floor layers  22 ) but the support is also used for connecting the side panels  24 , internal wall panels  24 A and back panels  26  for each compartment. As also shown in  FIG. 5 , there are different types of floor supports: S 1 , S 2 , S 3  and S 4 . Floor supports S 1 , S 3  and S 4  comprise magnet support arms A to which magnets M are secured. Depending on where the floor supports are used, i.e., on the front, sides or back of the poultry cage  20 A and whether the floor supports are used in the corners determines which type of floor support is used. For example, floor supports being used at the front of the cage  20 A, utilize floor supports S 1 , while floor supports being used at the left and right front corners use floor supports S 3  and S 4 , respectively, because those floor supports include magnets M for maintaining the doors  28  in a closed condition, as will be discussed later; floor supports used along the sides ( FIG. 4 ) and the back ( FIG. 2 ) of the cage  20 A, utilize floor supports S 2  since there are no doors  28  for the compartments along the sides and back of the cage  20 A. The floor supports S 1 , S 2 , S 3  and S 4  are secured to their respective vertical struts  32  or corner struts  34  via fasteners (for example, see  FIG. 11 ) via holes H (for example, see  FIG. 5 ). 
       FIG. 6A  shows a front view and a back view of the corner strut  34  having a “stack” of floor supports S 3  secured thereto. This corner strut  34  corresponds to the corner strut  34  shown in  FIG. 1  at the left front corner of the cage  20 A. The different floor layers  22  that are disposed in between the floor supports S 3  are shown in phantom. Correspondingly, in  FIG. 6B , there is shown a front view and a back view of the vertical strut  32  having a “stack” of floor supports S 2 . It should be noted that the vertical strut  32 /floor supports S 2  assembly (shown with the different floor layers  22  (indicated in phantom) disposed in between the floor supports S 2 ) is positioned at the back, or on the sides, of the poultry cage  20 A as shown by the reference numbers  32  in  FIG. 2  since, as mentioned previously, no doors  28  are located on the sides or the back of the cage  20 A. As can be appreciated from  FIGS. 5-6 , two plugs P are provided which are inserted through the holes (not shown) of a floor layer  22  and then mated with corresponding holes (not shown) in another floor support positioned below the upper floor support. 
       FIG. 12  depicts a partially-assembled poultry cage  20 A of the present invention. As can be seen, floor supports S 2  are seen secured to respective vertical struts  32  and to a back corner strut  34  and are awaiting a floor layer  22  to be disposed thereon. The floor supports S 1 -S 4  have a groove or slot formed in extruded aluminum in which a tongue or protrusion T of a polymer component (e.g., sidewall panel  24 , internal sidewall panel  24 A and back wall panel  26 ) fits and is able to be slid in position within the cage assembly  20 A. Furthermore, it should be understood that a key durability component of the present cage assembly  20 A is that the outside frame member (e.g., floor supports S 1 -S 4 , and vertical struts  32 /corner struts  34 , including the base portion  31  ( FIG. 4 )) are all mechanically fastened (e.g., bolts/screws and nuts and/or rivets, etc.) together but they are not welded together. Thus, these components, along with the base  31  and the top or cage roof  33  ( FIGS. 1-2 ) are mechanically fastened, not welded, to form this outer frame member. Among other things, the fastened components allow for expansion and contraction. 
     As shown in  FIGS. 7-9B , the side wall panel  24 , internal wall panel  24 A, the rear wall panel  26 , and the door panel  28  are formed (e.g., via injection molding) of a suitable durable polymer e.g., plastic such as poly-carbonate, polymethyl methacrylate, polyesters, polyolefins (e.g., polypropylene and polyethylene), polystyrene, or the like. The suitable durable polymer should be both light weight and durable to facilitate the transport and reuse of the improved poultry cage  20 . 
       FIG. 7  illustrates a side wall panel  24 . The side wall panel  24  panel is perforated with a plurality of generally rectangular windows  50  or air vents. The narrow panel between the windows  50  incorporates a perpendicular rib on the back side of the side wall panel  24  to improve the structural integrity of the side wall panel  24 . The rib helps prevent bowing of the side wall panel  24  under stress. In exemplary embodiments, the side wall panel  24  may be molded of a high impact polymer such as polypropylene, polycarbonate, ABS, or the like. Similarly to the side wall panels  24 , on the inside of the cages, interior wall panels  24 A define the containment area for inner portions of the poultry cage  20 A. 
     An exemplary side wall panel  24  contains a tongue or protrusion T disposed on the edges of the side wall panel  24 . The tongue T is designed to match or fit with the groove profile of the aluminum components (e.g., floor supports S 1 -S 4 ), including vertical struts  32 /corner struts  34  and floor panel  12 . In addition, pegs TS located on the bottom edge of the side wall panel  24  are received in corresponding grooves GS (see  FIGS. 1-2 ) in the floor layer  22 . 
       FIG. 8  also illustrates the rear wall panel  26 , which is similar in configuration to the side wall panel  24 . The rear wall panel  26  includes a similar window  50  configuration, and protrusions as the side wall panel  24 , as shown in  FIG. 7 . Accordingly, the window configurations allow proper airflow to prevent possible death during hauling activities. These windows also allow for easy application of a tarp during the winter season. The rear wall panel  26  may be molded of a high impact polymer such as polypropylene, polycarbonate, ABS, or the like. 
     The rear wall panel  26  has flat planer edges on the vertical extremities, which provide a tongue T for the groove receiver of the vertical aluminum frame members (e.g., floor supports S 1 -S 4 , and vertical struts  32 /corner struts  34 ). The rear wall panel  26  (and other wall panel components) when assembled to the floor panel  12  and frame members (e.g., floor supports S 1 -S 4 , and vertical struts  32 /corner struts  34 ) are secured into place with mechanical fasteners, such a staples, screws, rivets, or adhesive, and/or plugs. In addition, pegs TB located on the bottom edge of the back wall panel  26  are received in corresponding grooves GB (see  FIGS. 1-2 ) in the floor layer  22 . 
     It should be further understood that longitudinal and traverse reinforcing ribs of two depths may be used in the floor panel  22 . The shallow ribs provide uniform strength and the deeper ribs provide perimeter strength and interlock compartments to the pallet structure. The poultry cages  20 A are interlocked to each other in a stack by interlocking the deep floor ribs inside the adjacent poultry cages  20 A. 
       FIG. 9B  illustrates the door  28 , which includes a magnetically attractive plate (also referred to as “strikeplate”)  38  that is disposed on the upper extremities of the door  28 . The door  28  also includes a metal hinge  40 , such as, for example and not limitation, a piano hinge, that is disposed on the lower longitudinal plane of the door  28  and is also affixed to the floor panel  22  by mechanical fasteners. The hinge  40  is mounted to the door  28  and the floor panel  28  in a manner that the hinge knuckle is on the underside to prevent obstructing the removal of poultry when the cage assembly  20 A is tilted. The mechanical fasteners used to secure the hinge  40  are designed to break-a-way under stress to prevent damage to the door  28  or the floor panel  22 . The door  28  includes a series of longitudinal ribs at the top extremity that increases the structural integrity of the door  28  and reduces bowing of the door  28  under stress. The upper corners of the door include magnetically attractive plates  38  that are designed to align with the magnets M when the door  28  is in a closed position. The attractive force between the magnetically attractive plate  38  and the magnets M is designed to be overcome by the weight of a plurality of birds pressing against the door  28  when the cage  20 A is in a tilted position (e.g., during dumping). Therefore, doors  28  are injection molded from high density polyethylene plastic with metal striker plates for the magnets to catch. Furthermore, the doors  28  are hinged by a bulb or tongue inside an extruded aluminum slot bolted to the floor  22  allowing for easy replacement. 
     For the polymer doors  28 , they may be rotationally mounted to the aluminum cage frame with steel pins extending from a tubular profile incorporated in the door panel  28 . The pins are designed to extend beyond the door a sufficient amount to protrude into the slightly larger holes in the vertical frame support (e.g., vertical struts  32  and corner struts  34 ) located on each horizontal extremity of the door  28 . For the polymer door  28 , the bottom of the door  28  has downward tabs with a hollow core (see  FIG. 9A ) through which the steel pin or bayonet is used to attach the door  28  with the aluminum floor  22  for the containment area, where the floor has upwards tabs with a hollow core through which the pin is also fastened (see  FIG. 9B ). 
     In use, a lot of doors are torn off during normal wear &amp; tear of poultry cages. For conventional cages, the doors are reasonably expensive to replace, since conventional doors are made out of aluminum. Therefore, an advantage of the door assembly  28  of embodiments of the present disclosure is that, since polymer doors are generally less expensive to manufacture, the doors  28  are less expensive to replace. 
     It should be understood that it is within the broadest scope of the present invention that the positioning of the magnets M and the strikeplates  38  can be reversed, namely, the magnets M could be located on the doors and the strikeplates  38  could be located on the arms A of the floor supports. It should also be understood that the magnetic coupling of the compartment door closure is by way of example only. There are many other means for maintaining the doors in a closed condition during transport, such as spring mechanisms, and that it is within the broadest scope of the present invention to include such other closure mechanisms. 
     Thus, the aluminum floor panels  22 , the polymer side wall panels  24  and internal wall panels  24 A, the polymer rear wall panels  26 , and the aluminum frame components are affixed to one another using a tongue and groove connection system. Furthermore, as mentioned previously, containment panels are made of injected molded plastic to reduce weight and are held in place by a locking bulb mechanism on each end of the panel and a molded locking bayonet on the bottom. For example, outer edges of the polymer components may include tongues (e.g., a rounded area or bulb) which mate with grooves or a slot of the floor spacer S 1 , S 2 , S 3  or S 4  of the frame or other support members formed as extruded aluminum and allow for the polymer components to be positioned securely. 
     As mentioned earlier with respect to  FIG. 4 , the aluminum and polymer constructed cage  20 A of the present disclosure utilizes two forklift sleeves  29  to form a rectangular base  31  for the cage  20 A. For example, cages  20 A may be built on heavy gage aluminum fork tubes to facilitate the cage being moved with a forklift. As mentioned previously, the outer frame is constructed of vertical struts  32  and corner struts  34  that may comprise square tubular posts, which are bolted to each side of the base  31  to segment the frame into compartment stacks. The floor supports are then aligned with the vertical struts  32  or corner struts  34  to provide support for the compartment floors. A single sheet of aluminum  22  is positioned on the floor supports at a common elevation, which provides flooring for the compartments on each level. The cage roof  33  ( FIGS. 1-2 ) is constructed from a single panel of galvanized sheet metal bolted or fastened to the square tubing frame located around the perimeter of the top of the compartments. In exemplary embodiments, the mechanical fastener or bolt may be a metal rivet, a stainless steel bolt, a staple, or the like. 
     It is advantageously noted that the use of such metal fasteners (as opposed to welding) maintains the strength or integrity of the aluminum frame. Additionally, the aluminum support structures are also formed of extruded aluminum which also does not require welding. Therefore, an exemplary cage  20 A is made structurally strong by using extruded aluminum pieces bolted together. Accordingly, by use of fasteners, individual pieces can be individually replaced and repair, whereas a welded cage may have to be discarded as a whole. For example, the poultry cage  20 A can be unbolted or unfastened to access and replace a damaged part and then reassembled. Further, the lightweight nature of aluminum and polymer materials used in construction of the poultry cage  20 A substantially reduces the weight and cost of the cage in comparison to conventional methods. 
     As shown in  FIGS. 13 and 16 , the assembled improved poultry cages  20 A may be stacked on top of each other to a desired height (e.g., two poultry cages  20 A stacked on top of each other). The stack of improved poultry cages  20 A can be positioned to fill the reduced weight trailer  20 B to the desired number of layers. 
     Turning now to  FIGS. 1 and 13-14 , a binding system used to arrest movement of the poultry cages  20 A is illustrated. The outer face of the fork sleeve channel incorporates a circular or oral orifice  74  that may be located in the channel&#39;s mid-point ( FIG. 13 ) or alternatively, the orifice  74  may be located on a center-vertical-side support member or post ( FIG. 1 ), which receives a metal rod binder hook  76  which is attached to a cloth belt  78  with a metal bracket fastened to the hook&#39;s “D” handle. The device is used to secure the cage stack to the transport trailer with a belt winch mounted to the underside of the transport trailer&#39;s outer longitudinal frame. The end stack of cages located on the rear extremity of the transport trailer is secured with two binder devices and belt winches  82  spaced to provide securing force at opposing angles to each other. 
     Removing the cages from the trailer deck requires relieving the tension on the trailer mounted belt winch  82  a sufficient amount to un-hook the metal rod hook  76  from the upper cage stretcher orifice. As no spring is incorporated, reliving the belt tension is safe to the operator and the tension in a truck roll-over is secured by the tinsel strength of the belt and winch mounting rather than the compressive strength of an incorporated spring as is the case in the conventional binding device. 
     Reduced Weight Trailer  20 B 
     To achieve the required weight reduction to make an integrated transport system viable, a significant amount of weight must be eliminated in the conventional light-weight aluminum trailer, which maximizes cubic feet availability. Accordingly, disclosed herein is a trailer structure that accomplishes this goal. To accomplish the economic goals of the transport system the trailer must accommodate twenty-four cages light weight cages with a foot print four feet by eight feet and not exceed the legal length mandated by the states where the transport system is used. In particular, in order to optimize the trailer construction such that the payload (i.e., live bird pounds) is maximized while trailer weight is minimized, the trailer structure maximizes cubic feet available by, among other things, riding low as safely as possible, while reducing weight wherever possible (e.g., using aluminum, using a partial floor, etc.) yet supporting the cages  10  in a secure manner (e.g., via the use of guides on the trailer edges that interlock with the edges of the cages  10 ). 
     Turning now to  FIGS. 15-16H , a frame structure  84 A/ 84 B of a light-weight trailer  20 B in accordance with exemplary embodiments of the disclosure is illustrated. The weight reduction of the trailer is accomplished by constructing a frame structure  84 A/ 84 B that is configured expressly for supporting the pallets of the cage stacks and removing the unnecessary remaining deck structure. The frame structure  84 A/ 84 B is designed to support an evenly loaded trailer rather than a conventional trailer designed for worst case support of a large maximum weight located in a central location of the trailer deck. In one embodiment, as shown in  FIG. 15 , the back wheels (and axles) of the trailer may be spaced apart to meet applicable bridge laws and regulations. 
     In particular, as shown most clearly in  FIGS. 15A-15D , the trailer  20 B forms a drop deck configuration comprising an upper deck  84 A and a lower deck  84 B. The lower deck  84 B which comprises the majority of trailer  86  is formed of two aluminum main beams  100 A/ 100 B ( FIG. 15D ) that are oriented longitudinally along the axis  101  of the trailer. The lower deck  84 B is secured to the aluminum main beams  100 A/ 100 B. To reduce weight without compromising strength, the floor portions  88 A and  88 B of the upper deck  84 A and the lower deck  84 B, respectively, comprise a narrow centralized region. Since the edges of the cages  20 A rest upon the guides  106 A/ 106 B on the sides of the trailer bed structure, it was determined that the flooring outward from a middle flatbed region to the sides of the trailer  86  could be removed and that by omitting such flooring, the weight of the trailer  86  could be reduced. As a result, the narrowed floor portions  88 A/ 88 B allow for trailer weight reduction while at the same time providing sufficient resistance to racking or twisting of the trailer  86  during use. The floor portions  88 A/ 88 B may comprise a plurality of extruded aluminum members that are bolted together along the axis  101  of the trailer bed. Another advantage of the minimized flooring is that it permits chicken litter, that is pulled onto the trailer  20 B while loading, to escape and not build up on the floor of the trailer  20 B which would occur it were a complete floor. 
     A suspension assembly or bogie  102  mounts the tail end of the trailer  20 B to the back wheel assembly while landing gear  104 A/ 104 B supports the front end of the trailer  20 B when it is not coupled to the tractor&#39;s fifth wheel. The suspension assembly  102  may comprise “sliders” (not shown) that permit the separation between axles in the suspension assembly to be adjustable in order to meet the bridge laws of various jurisdictions in the U.S. 
     As with the use of aluminum in the cages  20 A, use of aluminum for the trailer  20 B provides for a stable yet light-weight structure. Also, the aluminum material is able to better withstand the deteriorating effects of fecal matter from the poultry. 
     Proper loading of the poultry cages  20 A on the light-weight trailer  20 B prevents cage stacks being inadequately supported and/or exceeding the legal length of the trailer  20 B. In one embodiment, the trailer is equipped with transverse and longitudinal deck beams and longitudinal center floor strip  88  for added support above the beams for poultry cage loads. 
     In exemplary embodiments, the poultry cage transportation assembly including the stack of improved poultry cages  20 A provides a reduced poultry cage weight which permits greater payload and fuel economy (thereby also reducing carbon emissions) for transportation of poultry. Furthermore, the improved poultry cages  20 A provide additional savings by breaking down for transport when not used to transport live poultry. 
     Consider that a conventional poultry cage assembly generally weighs between 900-950 lbs. If a typical trailer is able to haul  22  of these cages; a trailer typically weighs between 13,000-14,000 lbs.; and the tractor also typically weighs 14,000 lbs., then, the empty weight of a truck and trailer loaded with 22 cages is (22×900)+(14,000)+(14,000)=47,800 lbs. 
     Assuming the maximum load allowed for the truck/trailer is 80,000 lbs., the weight of the maximum load of poultry will be 32,200 lbs., for the conventional poultry cage assembly and trailer setup. 
     In contrast, the improved poultry cage assembly of the present invention may comprise a four-shelf light-weight cage and a five-shelf light-weight cage, each of them weighing 411 lbs. and 480 lbs., respectively. In addition, the improved light-weight trailer of the present invention weighs empty at 8260 lbs. Since the upper deck  84 A accommodates four of the four-shelf cages  20 A and the lower deck  84 B accommodates twenty of the five-shelf cages  20 A, then the empty weight of a truck, 24 light-weight cages and the light-weight trailer is ([4×411]+[20×480])+14,000+8260=33,504 lbs. 
     Again, assuming the maximum load allowed for the truck/trailer is 80,000 lbs., the weight of the maximum load of poultry will be 46,496 lbs. (i.e., 80,000 lbs.-33,504 lbs.), for the improved poultry cage assembly and trailer combination of the present invention, which is a substantial improvement, while also carrying an additional two poultry cages (24[present invention]−22[conventional poultry hauling trailer]=2). Such improvements to a poultry cage assembly and trailer design, in accordance with the present disclosure, may reduce the weight of conventional hauling cages by 50% allowing for a larger payload per trailer (without exceeding legal weight limits), thus reducing the number of loads required. Further, such improvements may allow for increased payloads, thus reducing the amount of required trips, thereby saving fuel and man hours. 
     Referring next to  FIG. 16-16H , an embodiment of the improved poultry cage assembly and trailer setup is shown with 24 cages loaded. It is noted that the cage assemblies on the drop deck of the trailer contain five shelves or containment levels per cage  20 A, whereas the cage assemblies  20 A′ on the up deck  84 A of the trailer contain four shelves or containment levels per cage. In this way, a maximum height may be maintained across the load of the trailer  20 B. Thus, it should be understood that cage assemblies  20 A′ are formed in the same way as cage assemblies  20 A but only four shelves, rather than five shelves, are present. As a result, all of the features of cage  20 A are present in cage  20 A′ except that the cage  20 A′ only comprises four shelves. 
     In particular,  FIGS. 16A-16D  show different views of one stack of two cages  20 A placed on the trailer  20 B. To locate each cage  20 A that is placed on the trailer guide rails  106 A/ 106 B, a plurality of cage alignment stops  107  are evenly positioned along each guide rail  106 A/ 106 B, as can be seen clearly in  FIGS. 16A-16C . Each cage alignment stop  107  comprises a male member  107 A (see  FIG. 16E ). When a cage  20 A is placed upon the trailer  20 B (see  FIG. 16F ), the cage  20 A is positioned such that a corresponding female member  107 B receives the male member  107 A of the cage alignment stop  107 , as shown most clearly in  FIG. 16F . It should be noted that each cage  20 A comprises the female member  107 B on its two opposite short sides under its bottom edge, between the forklift sleeves, as shown in  FIG. 16G . In addition, each cage  20 A also comprises the male member  107 A on its two opposite short sides on its top surface. As a result of these male/female members  107 A/ 107 B, cages  20 A can be stacked and automatically aligned to form an aligned column of cages with proper spacing between the stacks. 
     With the aligned stacked cages placed on the trailer  20 B, a ratchet mechanism  202  ( FIG. 17 ) is used to releasably secure the cage stacks to the trailer  20 B. This ratchet mechanism  202  is rated for predetermined pounds and is particularly adapted for this specific use. The ratchet mechanism  202  is the preferred cage/trailer releasable coupling mechanism when compared to the alternative and less preferred winch system (discussed previously with regard to  FIGS. 12-13 ). In this preferred configuration, a strap mounting plate  200  is coupled to the side of the trailer at each cage alignment stop  107 . A short length (e.g., approximately six inches) of strap is looped through the mounting plate  200  and secured (e.g., sewn) back on itself so that it is permanently attached to the trailer  86  and to the ratchet mechanism  202 . A hook  204  is inserted into the slotted holes on the side of the cage  10 , as discussed previously, and ratcheted down, thereby holding the cages  10  to the trailer  86 . 
     During transit, the last stack of two cages on the rear extremity of the light-weight trailer may pose a danger to vehicles and persons following the trailer during transit should the primary binding system fail. Safety frames  92 A/ 92 B shown in  FIG. 14  are designed to provide a fail-safe mechanism to prevent the cages  10  from sliding off the back of the trailer  20 B and to ensure that the cages  20 A remain secured to the light-weight trailer  20 B. The safety frames  92 A/ 92 B are the width of the frame structure  84  and extends sufficiently high to prevent the top cage in the stack from falling, where the safety frames  92 A/ 92 B are retained in the perpendicular position. Furthermore, safety frame  92 A is provided in the front of the trailer to prevent poultry cages  20 A from impacting the trailer cab. In addition, this safety frame  92 A at the front of the trailer  86  also serves to form a protective barrier (e.g., via the use of a tarp thereon, etc.) to be used in extreme cold weather to protect the chickens from cold air during transportation. Furthermore, the safety frame  92 B located at the end of the trailer  86  permits the incorporation of additional visual indicators that would not normally be available at the back end of a drop deck trailer (see  FIG. 17H ). This increases safety as it provides for better trailer visibility. 
     In addition to reduced weight, embodiments of the improved poultry cage  20 A and its structure are durable enough to with stand forklift abuse and the weight of the chickens during the transportation from farm to processing plant. For example, the use of bolts and metal fasteners provide sufficient flexibility and durability to withstand the rigors and compensate for contractions &amp; expansions or twists &amp; turns to the poultry cage assembly during routine transit and use (e.g., hauling and dumping). Therefore, the improved poultry cage  20 A can replace the steel cages currently used in the poultry industry, and in turn, provide a cage that reduces weight and enhances the ability to haul more chickens per load. Further, embodiments of the poultry cage  20 A of the present disclosure fit and comply with present dumping systems used by the broiler industry and are conducive to standard forklift procedures, transit loading and unloading procedures, and processing plant dumping and expulsion procedures. 
     It should be emphasized that the above-described embodiments are merely possible examples of implementations, merely set forth for a clear understanding of the principles of the disclosure. Many variations and modifications may be made to the above-described embodiment(s) of the present disclosure without departing substantially from the spirit and principles of the disclosure. 
     Accordingly, dimensional features of the improved poultry cage  20 A can be modified to fit current needs. As an example, one variety of the poultry cage  20 A contains an approximate 11-inch opening within each containment area. For this, the cage  20 A may be equipped to have 5 shelves. In addition, smaller chickens may need to be housed in a cage that does not require an 11-inch opening. Instead, an approximate 9-inch opening is used in an alternative variety of the improved poultry cage  20 A. Due to the reduced opening size, the cage  20 A may be extended to a 6-shelf height, as an example. 
     All such modifications and variations are intended to be included herein within the scope of this disclosure. 
     While the invention has been described in detail and with reference to specific examples thereof, it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope thereof.