Modular liftgate platform frame with interchangeable inserts

Abstract

Systems, devices, and methods for a lift platform system including: a platform assembly (1402) comprising an opening (1414); one or more interchangeable inserts (1406, 1408, 1410, 1412, 1430) configured to be received in the opening (1414) of the platform assembly (1402); and one or more engagement mechanisms (1418, 1420) configured to secure the one or more interchangeable inserts (1406, 1408, 1410, 1412, 1430) in the opening (1414) of the platform assembly (1402).

Description

PATENT COOPERATION TREATY APPLICATIONTITLE: MODULAR LIFTGATE PLATFORM FRAME WITH INTERCHANGEABLE INSERTSCROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to and the benefit of U.S. Provisional Patent Application No. 63 / 524,030, filed June 29, 2023, the contents of which are hereby incorporated by reference herein for all purposes.FIELD OF ENDEAVOR

[0002] The invention relates to lifts, and more particularly to liftgate platforms.BACKGROUND

[0003] Lifts such as lift gates and accompanying lift platforms are typically mounted at a structure such as an opening at a rear of a vehicle to lift payloads on the lift platform from one level (e.g., ground level) up to another level (e.g., the bed of the vehicle), or vice versa. Operation of a lifting mechanism may rotate or fold, partially rotate or partially fold the platform, stowed beneath or behind the vehicle body. Actuators, such as hydraulic actuators and electric actuators, are used to provide lifting force for moving the lift platform.SUMMARY

[0004] An embodiment may include a lift platform system including: a platform assembly comprising an opening; one or more interchangeable inserts configured to be received in the opening of the platform assembly; and one or more engagement mechanisms configured to secure the one or more interchangeable inserts in the opening of the platform assembly.

[0005] In another embodiment, the one or more fastening means may include one or more insert push brackets configured to secure the one or more interchangeable inserts in the opening of the platform assembly via one or more engagement mechanisms inserted through a portion of the one or more insert push brackets.

[0006] In another embodiment, the platform assembly may include platform sides, a hinge plate fixedly connected to one ends of the platform sides, and a back plate attachably MAX2-P.e46.PCT 1disconnected from the other ends of the platform sides, wherein one side of any one of the one or more interchangeable inserts may be connected to the back plate, wherein any one of the one or more interchangeable inserts connected to the back plate may be slid in a plane parallel to a plane formed by the platform sides into the opening surrounded by a U shape of the platform sides and the hinge plate.

[0007] In another embodiment, the one or more interchangeable inserts may comprise a first insert that includes a plurality of extruded platform segments.

[0008] In another embodiment, each of the plurality of extruded platform segments may have complementary connectors on both sides, and the plurality of extruded platform segments may be connected to each other by engaging the complementary connectors.

[0009] In another embodiment, each of the plurality of extruded platform segments may have a hollow tube shape, wherein each of the plurality of extruded platform segments may include at least one internal wall structure.

[0010] In another embodiment, the one or more interchangeable inserts may comprise a second insert that includes a core layer having a repeating series of cells and a top layer attached to a top surface of the core layer.

[0011] In another embodiment, the cells of the core layer may comprise at least one of honeycomb-shaped cells, rectangular-shaped cells, square-shaped cells, and polygonal-shaped cells.

[0012] In another embodiment, each of the cells of the core layer may have a hollow structure defined by thin walls, and the hollow structure of each of the cells is filled with a filler component.

[0013] In another embodiment, the one or more interchangeable inserts may comprise a third insert that includes a grated structure in which a first set of parallel slats and a second set of parallel bars intersecting the first set are arranged.

[0014] In another embodiment, the one or more interchangeable inserts may comprise a fourth insert that includes multiple spaced extruded platform segments and a top layer attached to top surfaces of the multiple spaced extruded platform segments, wherein the multiple spaced extruded platform segments may be spaced apart from each other and extended in parallel.MAX2-P.e46.PCT 2

[0015] In another embodiment, the one or more interchangeable inserts may comprise a fifth insert that includes multiple portions that are different from each other in at least one of structure and material.

[0016] In another embodiment, the platform assembly may further include at least one middle wall that further supports the one or more interchangeable inserts, wherein the one or more interchangeable inserts includes a sixth insert that includes multiple sub-inserts.

[0017] In another embodiment, any one of the one or more interchangeable inserts may be made of at least one of metal, metal alloy, foam, composite, paper, Compolite®, Nomex®, Tedlar®, balsa (wood), plastic, polyester, nylon, phenolic, short fibers, long fibers, woven fibers, particle fibers, flake fibers, layer fibers, and fillers.

[0018] In another embodiment, the lift platform system may further comprise a flipover assembly pivotally connected to the platform assembly.

[0019] In another embodiment, the flipover assembly may be configured to receive at least one of a plurality of extruded platform segments connected to each other; a cell core layer having a repeating series of cells, a grated core layer in which a first set of parallel slats and a second set of parallel bars intersecting the first set are arranged, a layer including multiple sections and at least one support plate therebetween, and a layer including multiple portions that are different from each other in at least one of structure and material.

[0020] An embodiment may include a method comprising: placing one interchangeable insert of one or more interchangeable inserts via an opening of the platform assembly of a lift platform system; fastening the placed interchangeable insert to the platform assembly with one or more engagement mechanisms; and interchanging the fastened interchangeable insert with another interchangeable insert of one or more interchangeable inserts via the opening of the platform assembly, wherein the one or more interchangeable inserts are different from each other in at least one of structure and material.

[0021] In another embodiment, the step of placing one interchangeable insert may be placing the interchangeable insert from the top of the platform assembly, wherein the step of fastening the first interchangeable insert may include: placing one or more insert push brackets over a top portion of the placed interchangeable inserts; and securing the placed interchangeable inserts to the platform assembly via the one or more engagement mechanisms inserted through a portion of the one or more insert push brackets.

[0022] In another embodiment, the platform assembly may include platform sides, a hinge plate fixedly connected to one ends of the platform sides, and a back plate attachablyMAX2-P.e46.PCT 3disconnected from the other ends of the platform sides, wherein one side of the one interchangeable insert may be connected to the back plate, wherein the step of placing one interchangeable insert may be sliding the one interchangeable insert in a plane parallel to a plane formed by the platform sides into the opening surrounded by a U shape of the platform sides and the hinge plate.

[0023] In another embodiment, the method may further comprise the step of connecting a flipover assembly to the platform assembly so that the flipover assembly (1404) is pivotally folded upon the platform assembly.BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principals of the invention. Like reference numerals designate corresponding parts throughout the different views. Embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which:

[0025] FIG. 1 depicts a perspective view of an extrusion lift platform of a lift platform system, in accordance with an embodiment of the invention.

[0026] FIG. 2A depicts a side view of an extrusion lift platform of a lift platform system, in accordance with an embodiment of the invention.

[0027] FIG. 2B depicts a side view of a single extruded platform segment of an extrusion lift platform, in accordance with an embodiment of the invention.

[0028] FIG. 2C depicts a side view of two extruded platform segments connected in parallel to form an extrusion lift platform, in accordance with an embodiment of the invention.

[0029] FIG. 3 is a side view of a lift platform system with an unfolded lift platform, in accordance with an embodiment of the invention.

[0030] FIG. 4 is a side view of a lift platform system with a folded lift platform, in accordance with an embodiment of the invention.

[0031] FIG. 5 is a perspective view of a lift platform system, wherein the unfolded lift platform of a lift platform system is in a raised position, in accordance with an embodiment of the invention.

[0032] FIG. 6 is a perspective view of a core lift platform of a lift platform system, in accordance with an embodiment of the invention.MAX2-P.e46.PCT 4

[0033] FIG. 7A is a perspective view of a single honeycomb-shaped cell of a core layer of a core lift platform, in accordance with an embodiment of the invention.

[0034] FIG. 7B depicts various materials of a honeycomb-shaped cell in a magnified view of an M portion in FIG. 7A, in accordance with embodiments of the invention.

[0035] FIG. 8 is a perspective cutaway view of a core layer of a core lift platform, which comprises a plurality of honeycomb-shaped cells, in accordance with an embodiment of the invention.

[0036] FIG. 9 is a perspective cutaway view of a core lift platform with a core layer having a plurality of honeycomb-shaped cells, in accordance with an embodiment of the invention.

[0037] FIG. 10 is a perspective cutaway view of a core lift platform with a core layer having a plurality of rectangular-shaped cells, in accordance with an embodiment of the invention.

[0038] FIG. 11 A is a perspective view of a grated flipover section on a lift platform, in accordance with an embodiment of the invention.

[0039] FIG. 1 IB is a top view of the grated flipover section on the lift platform of FIG. 11 A, in accordance with an embodiment of the invention.

[0040] FIG. 11C is a cross-section view of the lift platform of FIG. 1 IB along line A- A, in accordance with an embodiment of the invention.

[0041] FIG. 12A is a top exploded perspective view of a flipover section with multiple inserts and support plates on a lift platform, in accordance with an embodiment of the invention.

[0042] FIG. 12B is a bottom perspective view of a flipover section with multiple inserts and support plates on a lift platform, in accordance with an embodiment of the invention.

[0043] FIG. 13 is a top exploded perspective view of a platform section of a lift platform with spaced extruded platform segments, in accordance with an embodiment of the invention.

[0044] FIG. 14A depicts a top perspective view of a lift platform system with alternate top insert options, in accordance with an embodiment of the invention.

[0045] FIG. 14B depicts a bottom perspective view of the lift platform system of FIG. 14A with alternate top insert options, in accordance with an embodiment of the invention.MAX2-P.e46.PCT 5

[0046] FIG. 14C depicts a top perspective view of a platform assembly for receiving an insert of FIG. 14A in a state where the platform assembly is connected to a flipover assembly , in accordance with an embodiment of the invention.

[0047] FIG. 14D depicts a bottom perspective view of the platform assembly for receiving the insert of FIG. 14A in a state where the platform assembly is connected to the flipover assembly of the lift platform system, in accordance with an embodiment of the invention.

[0048] FIG. 14E depicts a top view of the platform assembly for receiving the insert of FIG. 14A in a state where the platform assembly is connected to the flipover assembly , in accordance with an embodiment of the invention.

[0049] FIG. 14F depicts a flowchart of a method for assembling and utilizing a lift platform system, in accordance with an embodiment of the invention.

[0050] FIG. 15A depicts a top perspective view of a lift platform system with alternate side insert options, in accordance with an embodiment of the invention.

[0051] FIG. 15B depicts a bottom perspective view of the lift platform system of FIG. 15A with alternate side insert options, in accordance with an embodiment of the invention.

[0052] FIG. 15C depicts a top view of a platform assembly for receiving an insert of the lift platform system of FIG. 15 A, in accordance with an embodiment of the invention.

[0053] FIG. 15D depicts a bottom view of the platform assembly for receiving an insert of the lift platform system of FIG. 15 A, in accordance with an embodiment of the invention.

[0054] FIG. 15E depicts a flowchart of a method for assembling and utilizing a lift platform system, in accordance with an embodiment of the invention.

[0055] FIG. 16A depicts a top perspective view of a platform assembly for receiving an insert from the side, in accordance with an embodiment of the invention.

[0056] FIG. 16B depicts a top perspective view of the platform assembly for receiving an insert attached to a back plate, in accordance with an embodiment of the invention.

[0057] FIG. 16C depicts a top perspective view of the platform assembly for receiving the insert into the platform sides and hinge plate, in accordance with an embodiment of the invention.MAX2-P.e46.PCT 6

[0058] FIG. 16D depicts a top perspective view of the platform assembly with the insert inserted into the platform sides and hinge plate and secured with the back plate, in accordance with an embodiment of the invention.

[0059] FIG. 16E depicts a close-up top perspective view of the platform assembly showing engagement mechanisms for securing the back plate to the insert, in accordance with an embodiment of the invention.

[0060] FIG. 17 depicts a close-up top perspective view of engagement mechanisms for securing the back plate to the insert and platform sides, in accordance with an embodiment of the invention.

[0061] FIG. 18A depicts a top perspective view of a lift platform system having a platform connected to a flipover by a hinge, in accordance with an embodiment of the invention.

[0062] FIG. 18B depicts a bottom perspective view of the lift platform system of FIG. 18A having the platform connected to the flipover by a hinge, in accordance with an embodiment of the invention.

[0063] FIG. 18C depicts a top view of the lift platform system of FIG. 18A having the platform connected to the flipover by a hinge, in accordance with an embodiment of the invention.

[0064] FIG. 18D depicts a bottom view of the lift platform system of FIG. 18A having the platform connected to the flipover by a hinge, in accordance with an embodiment of the invention.

[0065] FIG. 18E depicts a side view of the lift platform system of FIG. 18A having the platform connected to the flipover by a hinge, in accordance with an embodiment of the invention.DETAILED DESCRIPTION

[0066] The following description is made for the purpose of illustrating the general principles of the embodiments discloses herein and is not meant to limit the concepts disclosed herein. Further, particular features described herein can be used in combination with other described features in each of the various possible combinations and permutations. Unless otherwise specifically defined herein, all terms are to be given their broadest possible interpretation including meanings implied from the description as well as meanings understood by those skilled in the art and / or as defined in dictionaries, treatises, etc.MAX2-P.e46.PCT 7

[0067] The lift platform systems of the present embodiments may comprise one or more interchangeable inserts having the reduced weights, sufficient strengths, and a structure where the one or more interchangeable inserts may be replaced to one another based on the required capacity and weight according to the multiple purposes of the lift platform systems. The one or more interchangeable inserts may provide increased efficiency in weight support and fuel efficiency when the lift platform system is mounted on a vehicle. In some embodiments, the lift platform system may include an extrusion lift platform. The insert of extrusion lift platform may contain multiple extruded platform segments, each of which has a thin rectangular slat structure and is connected to each other by engaging complementary connectors. Accordingly, the extrusion lift platform may provide superior strength while maintaining the light weight. In some embodiments, the lift platform system may include a core lift platform. The insert of the core lift platform may include a top layer, a bottom layer, and a core layer disposed between the top layer and the bottom layer. The core layer may include a repeating series of cells, each of which has a three dimensional hollow structure defined by thin walls. With this structure, the core lift platform may significantly reduce the weight while providing sufficient strength. The repeating series of cells may have a fixed shape throughout the core layer. The fixed shape may be orientated substantially perpendicular to the top layer and the bottom layer such that at least one face of the cell is adjacent to the top layer and / or at least one face of the cell is adjacent to the bottom layer. A first adhesive component may be disposed between the top layer and the core layer. In some embodiments, the first adhesive component may be a weld applied to the perimeter of at least a portion of the top layer and / or the core layer. In other embodiments, the first adhesive component may be a layer of epoxy applied across at least a portion of the top layer and / or the core layer. The core layer may be adhered to the bottom layer by a second adhesive component. The second adhesive component may be disposed between the bottom layer and the core layer. The core layer may be adhered to the bottom layer by the second adhesive component. The cells of the core layer may comprise at least one of honeycomb-shaped cells, rectangular-shaped cells, square-shaped cells, and / or any polygonal-shaped cells. Each of the core layer, the top layer, and the bottom layer may be made of at least one of: metal, metal alloy, composite, fibers, fillers, foam such as Styrofoam™, polyethylene, polyurethane, and polystyrene, paper, Compolite®, Nomex®, Tedlar®, balsa (wood), plastic, polyester, nylon, and phenolic but is not limited thereto. The composite, fibers, fillers, and foam materials may be very light and solid. These materials may be cut and machined to form at least one of coreMAX2-P.e46.PCT 8layer, top layer, and bottom layer, and then the machined core layer, top layer, and bottom layer may be glued to each other. In another embodiment, the core layer may be welded to the top layer and to the bottom layer. Other forms of adherence of the core layer may be welded to the top layer and to the bottom layer are possible and contemplated. In some embodiments, the lift platform system may include a grated lift platform, which has a structure in which a first set of parallel slats and a second set of parallel bars intersecting the first set are arranged. In some embodiments, the lift platform system may include a lift platform with multiple extruded platform segments spaced apart from each other and a top layer attached on the top surfaces of the multiple spaced extruded platform segments. Each of spaced, extruded platform segments may have a thin C-shaped slat structure, and accordingly may significantly reduce the weight while providing sufficient strength. The detailed structures of the embodiments will be described below.

[0068] With reference to FIG. 1, the disclosed lift platform system may include an extrusion lift platform 100. The extrusion lift platform 100 may be configured for mounting at a mounting structure such as, but not limited to, a rear frame of a vehicle, such as a truck or trailer. For example, the extrusion lift platform 100 may be attached to a rear opening of a vehicle bed of a vehicle, where the vehicle may include an extension plate. The load-carrying surfaces of the lift gate may comprise said extrusion lift platform 100. The extrusion lift platform 100 may typically be square or rectangular in shape and include a rectangular platform section 110 and a rectangular foldable section 120, also known as a “flipover”. The platform section 110 may comprise or be covered with multiple extruded platform segments 111, which may be generally thin rectangular slats that lie along the length of the platform section 110. In some embodiments, each of the multiple extruded platform segments 111 may have a hollow tube shape.

[0069] Similarly, the foldable section 120 may also comprise or be covered with multiple extruded platform segments 121, which may be thin rectangular slats. The extruded platform segments 111 and 121 may be made of one or more extruded materials such as metal or metal alloy (e.g. extruded aluminum) but are not limited thereto. The extruded platform segments 111 and 121 may be made of any type of materials that may be manufactured by the extrusion process. The interiors of the extruded platform segments 111 and 121 may be supported with spaced internal wall structures. In some embodiments, the extruded platform segments 111 of the platform section and the extruded platform segments 121 of the foldable section 120 may be identical. The platform section 110 and foldableMAX2-P.e46.PCT 9section 120 may be connected via a number of interlocking units 130 that may pivotally connect the sections 110, 120 in a manner that allows for folding of the folding section 120 underneath or onto the platform section 110. In certain embodiments, the interlocking units 130 may be male rods that couple with female holes present on both the platform section 110 and foldable section 120. The extrusion lift platform 100 may be used to lift payloads from one level, e.g., proximate the ground, up to another level, e.g., the vehicle bed of a vehicle, or vice versa. The lift platform system may be a stow away system and the foldable section 120 may be folded onto the platform section 110 during stowing of the extrusion lift platform 100. The extrusion lift platform 100 may be substantially aligned with the other parts of the lift gate system including, but not limited to, an extension plate. A ramp lip 140 may be positioned at one end of the foldable section 120 such that the ramp 140 may be attached to the end of the foldable section 120 distal from the platform section 110 when the foldable section 120 is unfolded. The ramp lip 140 may provide a ramping incline from a ground level to a top surface of the foldable section 120 and a top surface of the platform section 110.

[0070] FIG. 2A depicts a side view of a lift platform 200 of a lift platform system, in accordance with an embodiment of the invention. In some embodiments, the side view of the lift platform 100 shown in FIG. 1 may be similar to that of the lift platform 200. With reference to FIG. 2 A, the lift platform 200 may include a platform section 210, and a foldable section 220 similar to the section described in the discussion of FIG. 1. The platform section 210 may comprise multiple extruded platform segments 211, and the foldable section 220 may also comprise multiple extruded platform segments 221. The platform section 210 and foldable section 220 may be connected via one or more interlocking units 230 that may be similar to interlocking units 130 in FIG. 1, which may pivotally connect the sections 210, 220 in a manner that allows for folding of the folding section 220 underneath or onto the platform section 210. In some embodiments, each of the plurality of extruded platform segments 211 of the platform section 210 and the plurality of extruded platform segments 221 of the flipover section 220 may have a hollow tube shape, and the interiors of the extruded platform segments 211, 221 may be supported with at least one spaced internal wall structure 212, 222. In this case, in some embodiments, the spaced internal wall structure 212, 222 may not be perpendicular to a top and bottom surfaces of the extruded platform segment 211, 221. For example, the internal of the extruded platform segment 211 may include two spaced internal wall structures 212, and each of these two spaced internal wall structures 212 may be formed to be inclined to a top and bottom surfaces of the extruded platform segment 211. In someMAX2-P.e46.PCT 10embodiments, the two spaced internal wall structures 212 may be inclined in different directions, and the two spaced internal wall structures 212 may be closer to each other as they go from the top to the bottom, forming a V shape in a side view and cross section view. In other embodiments, the spaced internal wall structure 212, 222 may be perpendicular to a top and bottom surfaces of the extruded platform segment 211, 221

[0071] In some embodiments, at least a portion of a side of the lift platform 200 may be open and expose the internal supports of the platform section 210 and foldable section 220. Internal gaps 240 inside the extruded platform segments 211, 221 may be present that allow for lighter weight construction which results in increased fuel efficiency for vehicles that have the lift platform 200 attached. A ramp lip 250 may be positioned at one end of the foldable section 220 such that the ramp lip 250 may provide a ramping incline from a ground level to the top of the foldable section 220 and the platform section 210. In another embodiment, the lift platform 200 may be a single-piece platform, being comprised of either the platform section 210 or the foldable section 220. In another embodiment, the lift platform 200 may be a multi-piece platform with at least one section in addition to the platform section 210 and the foldable section 220. In some embodiments, at least a portion of the side of the lift platform 200 may be closed as shown in the lift platform 100 of FIG. 1.

[0072] FIG. 2B depicts a side view of a single extruded platform segment of an extrusion lift platform, in accordance with an embodiment of the invention. FIG. 2C depicts a side view of two extruded platform segments connected in parallel to form an extrusion lift platform, in accordance with an embodiment of the invention. With reference to FIGS. 2B and 2C, the present embodiments may include an extruded platform segment 1200, where multiple extruded platform segments 1200 may be connected in parallel to form an extrusion lift platform 1300. Each extruded platform segment 1200 may include a top portion 1202, a bottom portion 1204, and a middle portion 1206. The middle portion 1206 may be an internal wall structure that may support between the top and bottom portion 1202, 1204. The middle portion 1206 may be perpendicular to the top and bottom portion 1202, 1204 or form an inclined angle thereto. Each extruded platform segment 1200 may also include one or more connectors 1208, 1210, 1212, 1214 on both sides to connect or engage with one or more complementary connectors 1208, 1210, 1212, 1214 on another extruded platform segment 1200. In some embodiments, a top surface 1216 of the top portion 1202 may include a plurality of extruded grooves or other features to increase grip. Two or more extruded platform segments 1200 may be connected to the connection 1302 in parallel to form anMAX2-P.e46.PCT 11extrusion lift platform 1300. In some embodiments, the connection 1302 may include welding adjacent extruded platform segments 1200 together. In some embodiments, the connection 1302 may include adhering adjacent extruded platform segments 1200 together via an adhesive, nuts and bolts, or the like. The extruded platform segments 1200 may be identical or vary in appearance, shape, cell structure, cell shape, and the like. While a variety of lift platforms are described in the present disclosure, the specific configurations and structures of the lift platforms are largely dependent upon the requirements of specific applications. For example, it can be appreciated by those skilled in the art that the exact size, shape, material, and configuration of the core cells may be modified depending on the material or manufacturing costs and / or potential lift platform weight limits needed. The extruded platform segments (211, FIG. 2A) in the platform section (210, FIG. 2A) and / or the extruded platform segments (221, FIG. 2A) in the flipover section (220, FIG. 2A) may also be connected to each other by the methods described above.

[0073] FIG. 3 is a side view of a lift platform system with an unfolded lift platform, in accordance with an embodiment of the invention. FIG. 4 is a side view of a lift platform system with a folded lift platform, in accordance with an embodiment of the invention. FIG. 5 is a perspective view of a lift platform system, wherein the unfolded lift platform of the lift platform system is in a raised position, in accordance with an embodiment of the invention. A discussion of a lift platform system with a folding assistant arm is below.

[0074] With reference to FIG. 3, the present embodiments include a lift platform system 400 and folding assisting aluminum retention ramp assembly with an unfolded lift platform in accordance with an embodiment of the invention. In a number of embodiments, the lift platform 435 is lowered and substantially horizontal relative to the ground. In certain embodiments, the foldable section 432, which is a generally rectangular body with a variable thickness and a set of interconnecting parts on one side that allows it to flip over onto a platform section 431 of the lift platform 435, may be unfolded. In additional embodiments, the foldable section 432 may be in the unfolded position during lifting operations, such as shown in FIG. 4. In further embodiments, to stow the lift platform 435 underneath the body of a vehicle or within another body, an operator may first remove any load from the lift platform 435 and manually fold the foldable section 432 over onto the platform section 431. In some embodiments, the platform section 431 may be a generally rectangular body with a variable thickness. In additional embodiments, the foldable section 432 may be hinged to the platform section 431, allowing the foldable section 432 to be folded over onto the platformMAX2-P.e46.PCT 12section 431. The lift platform 435 may be attached to the rest of the lift gate system 400 by a pivot connection 430 that allows for folding and stowing of the lift platform 435. The platform section 110, 210 and flipover section 120, 220 of the lift platforms 100, 200 shown in FIGS. 1 and 2 A may be respectively operated in the similar manner of the platform section 431 and the foldable section 432 of the lift platform system 400.

[0075] In certain embodiments, the foldable section 432 may comprise a core layer with a top and bottom layer, while the platform section 431 may be composed of different materials. In other embodiments, at least one of the foldable section 432 and the platform section 431 may comprise a partial core layer. In other embodiments, the platform section 431 may comprise a core layer, while the foldable section 432 may be composed of different materials.

[0076] With reference to FIG.4, the present embodiments include the lift gate system 400 with a partially folded lift platform 435. In many embodiments, the lift gate system 400 is ready for stowing when the foldable section 432 is folded against the platform section 431. In more embodiments, the operator may push a switch to initiate stowing of the lift platform 435. In a number of embodiments, the lift platform 435 may require manual rotation of the foldable section 432 relative to the platform section 431 before the switch may be pressed to initiate stowing. The lift platform 435 may be attached to the rest of the lift gate system 400 by the pivot connection 430 that allows for the folding and stowing of the lift platform 435. In certain embodiments, the foldable section 432 may comprise a core layer with a top and bottom layer, while the platform section 431 may be composed of different materials. In other embodiments, the platform section 431 may comprise a core layer with a top and bottom layer, while the foldable section 432 may be composed of different materials.

[0077] With reference to FIG. 5, the present embodiments include a lift gate system 400, where the lift platform 435 is in a raised position. In many embodiments, a lifting mechanism 660 may move the lift platform 435 between a raised position and a fully lowered position. In a number of embodiments, when the lift platform 435 is in the raised position, the lift platform 435 may be substantially aligned with an extension plate 611 mounted at a bed 650 of a truck opening 651. In additional embodiments, the lift gate system 400 is configured for mounting at a structure such as a rear frame of a vehicle, such as a truck 670 or trailer. By way of example and not limitation, the lift gate 435 may be attached to the rear opening 651 of a vehicle bed 650 of the vehicle 670, having the extension plate 611. In still further embodiments, the extension plate 611 may be coupled, e.g., fixedly welded and / or removablyMAX2-P.e46.PCT 13connected with screws or nuts and bolts, adjacent to a rear face of the vehicle bed 650 for extending the depth, i.e., reach, of the vehicle bed 650 beyond the truck opening 651. In a similar embodiment depicted in FIGS. 3 and 4, the lift platform 435 may comprise a foldable section 432 and / or a platform section 431. The foldable section 432, platform section 431, and / or the lift platform 435 may comprise a core layer with a top and bottom layer.

[0078] While a variety of lift gate systems and lift platforms with core layers are described in the present disclosure, the specific configurations and structures of the lift platforms are largely dependent upon the requirements of specific applications. For example, it can be appreciated by those skilled in the art that the exact shape and configuration of the lift gate may be modified depending on the shape and height of the lift to be performed. Specifically, the type of platform used in the lift gate system may contain either a uniform or non-uniform thickness. Each type of thickness may require a different manufacturing method and may be structurally similar even if the size and shape of the interior core cells are variable. Additionally, the thickness and / or internal structure of the lift platforms may be changed based upon the types of weights that will need to be lifted and / or the number of duty cycles that are expected of the lift platform. A discussion of shapes suitable for a core cell structure is below.

[0079] FIG. 6 is a perspective view of a core lift platform of a lift platform system, in accordance with an embodiment of the invention. With reference to FIG. 6, the present embodiments may include a core lift platform 300. In many embodiments, the core lift platform 300 may be configured for mounting at a mounting structure such as, but not limited to, a rear frame of a vehicle, such as a truck or trailer. By way of example and not limitation, the core lift platform 300 may be attached to a rear opening of a vehicle bed of a vehicle, where the vehicle may include an extension plate. In various embodiments, the load-carrying surfaces of the core lift platform 300 may comprise at least one top layer 310, 320, at least one bottom layer (not pictured), and an interior core layer (not pictured) disposed between the at least one top layer 310, 320 and the at least one bottom layer. In some embodiments, the interior core layer may comprise a repeating series of cells of various shapes. In more embodiments, the top layers 310, 320 and / or bottom layers may be respectively affixed to the top and bottom surfaces of the core layer by a first adhesive component and / or a second adhesive component (See FIG. 8), each of which is disposed between the core layer and the top layer 310, 320 and between the core layer and the bottom layers, respectively. Each of the core layer, the top layer, and the bottom layer of the core lift platform 300 may be made of atMAX2-P.e46.PCT 14least one of various materials, such as metal, metal alloy, composite, fibers, fillers, foam such as Styrofoam™, polyethylene, polyurethane, and polystyrene, paper, Compolite®, Nomex®, Tedlar®, balsa (wood), plastic, polyester, nylon, and phenolic but is not limited thereto.

[0080] In a number of embodiments, the core lift platform 300 may include a platform section 350 and a foldable section 360 (also known as a “flipover”). In further additional embodiments, the platform section 350 may comprise an internal core layer (not pictured) with a solid external top layer 310 and bottom layer with similar external covers on the sides of the platform section 350.

[0081] Similarly, the foldable section 360 may comprise an internal core layer (not pictured) with a solid external top layer 320 and bottom layer (not pictured) and similar external covers on the sides of the foldable section 360. In further embodiments, the platform section 350 and foldable section 360 may be connected via a number of interlocking units 330 that may pivotally connect the sections 350, 360 in a manner that allows for folding of the folding section 360 underneath or onto the platform section 350. In certain embodiments, the interlocking units 330 may be male rods that couple with female holes present on both the platform section 350 and foldable section 360. In still further embodiments, the core lift platform 300 may be used to lift payloads from one level, e.g., proximate the ground, up to another level, e.g., the vehicle bed of a vehicle, or vice versa. In additional embodiments, the lift gate system utilizing the core lift platform 300 may be a stow away system and the foldable section 360 may be folded onto the platform section 350 during stowing of the core lift platform 300. In still additional embodiments, the core lift platform 300 may be substantially aligned with the other parts of the lift gate system including, but not limited to, an extension plate. In certain embodiments, a ramp lip 340, comprising a single piece of supporting metal, or other material, may be positioned at one end of the foldable section 360 along its width such that the ramp 340 provides a ramping incline from the ground level to the top of the foldable section 360 and platform section 350. The ramp lip 340 may be disposed distal from the platform section 350 when the foldable section 360 is unfolded.

[0082] Each of the cells may be a three dimensional hollow structure defined by thin walls. With this structure, the core lift platform 300 may significantly reduce the weight while providing sufficient strength. The cells of the core layer may comprise at least one of honeycomb-shaped cells, rectangular-shaped cells, square-shaped cells, and / or any polygonal-shaped cells. In one embodiment, the cells of the core layer (not pictured) may be at least partially filled with a filler component (956, FIG. 9) such as foam or other similarMAX2-P.e46.PCT 15materials to provide strength, noise dampening which may be caused by movement of the core cells (not pictured) within the core lift platform 300, and thermal insulation.

[0083] While a variety of core lift platforms are described above with reference to FIG. 6, the specific configurations and structures of the core lift platforms may be varied based upon the requirements of specific applications. For example, it can be appreciated by those skilled in the art that the sizes of the core lift platforms may be variable depending on the type and size of vehicle or structure that it may be utilized for. Additionally, the thickness and / or internal structure of the core lift platforms may be changed based upon the types of weights that will need to be lifted and / or the number of duty cycles that are expected of the core lift platform.

[0084] With reference to FIG. 7A, the present embodiments may include a single honeycomb-shaped core cell 700 structures. In additional embodiments, the cell height 730 (with respect to the Y-axis) of the honeycomb-shaped core cell 700 may be manufactured in various heights. In some embodiments, the cell height 730 may be between approximately 0.7 and 1.0 inches with a preferable height of approximately 0.8 to 0.9 inches but is not limited thereto. In some embodiments, the cell height 730 may be anywhere from approximately 0.5 to 4 inches. In certain embodiments, the cell height 730 of another style of honeycombshaped core cell 700 may be between approximately 1.2 inches and 1.6 inches, with a preferable height 730 of approximately 1.3 to 1.4 inches. In other embodiments, a height 730 of a third style of honeycomb-shaped core cell 700 may be between approximately 1.6 and 2.0 inches with a preferable height 730 of approximately 1.8 to 1.9 inches. Similarly, in more embodiments, the cell width or cell size 740 of a honeycomb-shaped core cell 700 may be between approximately 0.1 and 1 inches with a preferable cell size 740 of approximately 0.25 and 0.5 inches. In further additional embodiments, the cell wall thickness 750 may be between approximately 0.001 and 0.005 inches with preferable cell wall thickness of approximately 0.003 inches. In some embodiments, the cell size 740, or density, may be anywhere from 1 / 8-5.7#, 1 / 8-4.5#, *4-5.2#, 3 / 16-5.7#, 3 / 8-2.3#, *4-4.5#, and / or *4-2.3#, where X / X is cell size in inches and X.X# is honeycomb density in Pounds per Cubic Foot.

[0085] In further embodiments, the density of the honeycomb-shaped core cell 700 and core layer may be manufactured with a variety of densities. In some embodiments, the density of the honeycomb-shaped core cell 700 may be preferably between approximately 2.47 and 2.97 g / cm3for aluminum alloys. In yet further embodiments, the structure of the honeycomb-shaped core cell 700 may be non-perforated.MAX2-P.e46.PCT 16

[0086] In various embodiments, the honeycomb-shaped core cell 700 and resulting core layer (950, FIG. 9) may be made of at least one of various materials, such as metal, metal alloy, composite, fibers, fillers, foam such as Styrofoam™, polyethylene, polyurethane, and polystyrene, paper, Compolite®, Nomex®, Tedlar®, balsa (wood), plastic, polyester, nylon, and phenolic but is not limited thereto. FIG. 7B depicts various materials of a honeycomb-shaped core cell in a magnified view of an M portion in FIG. 7A, in accordance with embodiments of the invention. With reference to FIGS. 7 A and 7B, in various embodiments, the honeycomb-shaped core cell 700 and resulting core layer may be manufactured with a metal or metal alloy 701. In certain embodiments, the honeycombshaped core cell 700 and resulting composite core layer may be manufactured out of an aluminum alloy, such as a 3003 alloy. Other possible alloys for the honeycomb-shaped core cell 700 and resulting composite core layer are possible and contemplated. In some embodiments, the core cell 700 may be a 3003, 5052, 5052N, and / or 5056 alloy. In some embodiments, the core cell 700 may comprise one or more aluminum alloys, such as the 3000, 5000, 6000, and / or 7000 series.

[0087] In some embodiments, the honeycomb-shaped core cell 700 may be made of any one or a combination of various composites or foams 702 to 709. The honeycomb-shaped core cell 700 may be made of foam 702, such as polyethylene, polyurethane, and polystyrene, but is limited thereto. The composite may be a combination of two or more constituent materials with different physical and chemical properties. The two or more constituent materials of the honeycomb-shaped core cell 700 may include matrix material and / or reinforcement material. The matrix material may be monolithic material in which the reinforcement material may be embedded and uniformly distributed throughout the matrix material. The reinforcement materials may be at least one of high-strength additives distributed inside the matrix material. For example, in some embodiments, the honeycombshaped core cell 700 may be made of composite 703 including foam as matrix material and fibers as reinforcement materials. In this case, the foam may be polyethylene, polyurethane, polystyrene, and the like, and the reinforcement material may be various type of fibers or fillers.

[0088] In some embodiments, the honeycomb-shaped core cell 700 may be made of composite with short fibers 703, 704, composites with long fibers 705, 706, composite with particles 707, composite with layers 709, composite with flakes 705, and others. In some embodiments, the plurality of short fibers, or chopped fibers, may be discontinuouslyMAX2-P.e46.PCT 17distributed inside the matrix materials with no constant orientation. In another embodiments, the plurality of short fibers may be discontinuously distributed inside the matrix materials with the same orientation. In some embodiments, as shown in the composite 706, the plurality of long fibers may be woven. In some embodiments, as shown in the composite 705, the plurality of long fibers may be continuously arranged in parallel to each other inside the matrix materials. The combined material of the two or more constituent materials may have different characteristics from their original properties of each of the two or more constituent materials. The composite of the honeycomb-shaped core cell 700 may provide high strength to weight ratio. The composite may weigh approximately one fourth of steel and less than three fourth of aluminum but much stronger and stiffer than both materials per weight. Accordingly, the lift platform with the core layer made of these materials may significantly reduce the weight while providing sufficient strength.

[0089] In some embodiments, the shape of the core cell of the core layer may not be limited to a honeycomb shape. The core cell of the core layer may be any of rectangularshaped cell, square-shaped cell, and / or any polygonal-shaped cell. In some embodiments, the core cell may be at least partially filled with a filler component such as foam or other similar materials to provide strength, noise dampening which may be caused by movement of the core cells, and thermal insulation.

[0090] With reference to FIG. 8, the present embodiments include a core layer 800 of a core lift platform, which comprises a plurality of honeycomb-shaped cells, in accordance with an embodiment of the invention. In many embodiments, the core layer 800 comprises a top layer 820, a bottom layer 810, and a cell layer 830 that may be a series of repeating core cells 700 arranged together on a layer. In a number of embodiments, the top and bottom of the cell layer 830 may be covered by flat metal sheets that make the bottom layer 810 and the top layer 820, respectively. In additional embodiments, the flat sheets may be made of aluminum. In some embodiments, the cell layer 830 may be made out of materials including, but not limited to, metal such as Aluminum, metal alloy, composite, fibers, fillers, foam, such as Styrofoam™, polyethylene, polyurethane, and polystyrene, paper, Compolite®, Nomex®, Tedlar®, balsa (wood), plastic, polyester, nylon, and / or phenolic. The materials of cell layer 830 may be made with or without reinforcement materials, such as fibers or fillers. In certain embodiments, the bottom layer 810 and top layer 820 may be between 1 / 32 and % inch in thickness.MAX2-P.e46.PCT 18

[0091] In the embodiment shown in FIG. 8, the cell layer 830 comprises a series of honeycomb structures similar to the honeycomb structures described in the discussion of FIG. 7A. Those skilled in the art will recognize that the cell layer 830 may comprise any number of cell shapes and sizes, including, but not limited to, a rectangular, triangular, and / or square shape as shown in the discussion of FIG. 10. In more embodiments, the top layer 820 and the bottom layer 810 may be adhered to the cell layer 830 by a layer of adhesive applied between each layer and the cell layer 830. The cell layer 830 may be affixed to the top layer 820 by a first adhesive component 870. The cell layer 830 may be affixed to the bottom layer 810 by a second adhesive component 860. In additional embodiments, the entire core layer height 840 may be calculated as the sum of the thickness of the bottom layer 810, core layer 830, top layer 820, and any adhesive components 860, 870. In still additional embodiments, the height of the cell layer 850 may be determined as the distance between the inner surfaces of the bottom layer 810 and top layer 820. The fixed shape of each cell 700 in the core layer 800 may be orientated substantially perpendicular to the top layer 820 and the bottom layer 810 such that at least one face 880 of the cell is adjacent to the top layer and bottom layer.

[0092] FIG. 9 is a perspective cutaway view of a core lift platform with a core layer having a plurality of honeycomb-shaped cells, in accordance with an embodiment of the invention. With reference to FIG. 9, the present embodiments include the core lift platform 900, where the core lift platform 900 comprises multiple internally arranged honeycombshaped core cells 700. In many embodiments of the invention, the core lift platform 900 may be configured for attaching to a lift gate system, which thereby may be configured for mounting at a mounting structure such as, but not limited to, a rear frame of a vehicle (e.g., a truck or trailer). By way of example and not limitation, the core lift platform 900 may be installed on a lift gate system attached to a rear opening of a vehicle bed of a vehicle, where the vehicle may include an extension plate. In a number of embodiments, the core lift platform 900 comprises a platform section 910 and a foldable section 920 (also known as a “flipover”). In further embodiments, the platform section 910 and foldable section 920 may be connected via a number of interlocking units 930 that may pivotally connect the sections in a manner that allows for folding of the folding section 920 underneath or onto the platform section 910. In still further embodiments, the core lift platform 900 may be used to lift payloads from one level, e.g., proximate the ground, up to another level, e.g., the vehicle bed of a vehicle, or vice versa.MAX2-P.e46.PCT 19

[0093] In additional embodiments, the lift gate system utilizing the core lift platform 900 may be a stow away system and the foldable section 920 may be folded onto the platform section 910 during stowing of the core lift platform 900. In still additional embodiments, the core lift platform 900 may be substantially aligned with the other parts of the lift platform system including, but not limited to, an extension plate. In certain embodiments, a ramp lip 940 may be positioned at one end of the foldable section 920 such that the ramp lip 940 provides a ramping incline from the ground level to the top of the foldable section 920 and platform section 910. In still yet additional embodiments, the internal honeycomb-shaped cells of a core layer 950 of the foldable section 920 is visible within the foldable section 920 allowing for visualization of how the honeycomb-shaped core cells 700 may be arranged and spaced in order to provide internal structural support for the core lift platform 900.

[0094] Similarly, the internal honeycomb-shaped cells of a core layer 955 of the platform section 910 is visible within the platform section 910. Those skilled in the art can appreciate that although the current cutaway views show the honeycomb-shaped cells of the core layers 950, 955 within the platform section 910 and foldable section 920, similar structures may also be placed in a similar fashion throughout the core lift platform 900. In still yet further embodiments, the honeycomb-shaped cells of the core layers 950, 955 may provide increased efficiency in weight support on the core lift platform 900 while also being lighter than other internal structures, thus decreasing overall lift gate system weight and increasing fuel efficiency if the lift gate system is mounted on a vehicle.

[0095] In a variety of embodiments, the size of the platform may be manufactured to meet specific applications. For example, the thickness, length, and / or width of a panel, including the platform section 910 and / or the foldable section 920, may be selected depending on the size of vehicle. By way of example and not limitation, a total panel thickness including the platform section 910 and / or the foldable section 920 may be anywhere from approximately 0.5 to 3 inches, plus a top and a bottom layer thickness but is not limited thereto. In some embodiments, adhesive component may add some thickness as well.

[0096] In yet additional embodiments, the top layer and bottom layer may be manufactured to be between approximately 1 / 32 inch and 1 / 4 inch thick, but preferably is approximately 1 / 8 inch. In some embodiments, the top and bottom layer thickness may differ. In still additional embodiments, the top and bottom layers may be made of an aluminum alloy including, but not limited to, 6061. In some embodiments, the top and bottom layer aluminumMAX2-P.e46.PCT 20alloy may comprise Aluminum skins such as 2024-T3, 6061-T6 and / or 7075-T6. In some embodiments, the top and bottom layer may comprise unidirectional fiberglass reinforced epoxy facings / epoxy bonded. In some embodiments, the top and bottom layer may comprise aluminum grade - T3 or T6. Further, in still more embodiments, the type of aluminum alloy grade may vary depending on the application required but may preferably be T6 grade aluminum. In yet still more embodiments, a film adhesive utilized between the core layers 950, 955 and each of the top and bottom layer may be applied to adhere the top and bottom layers to the internal core cells 700 of the core layers 950, 955. In certain more embodiments, the adhesive may be a modified epoxy film adhesive. In more additional embodiments, the sides of the panels including the platform section 910 and / or the foldable section 920 may be covered with a solid aluminum bar to protect the interior of the panels, such as the core layers 950, 955, from dust, dirt, and / or the elements. Some embodiments of the top and / or bottom layer may include additional core / metal sheets (top & bottom) materials: metal, metal alloy, composite, fibers, fillers, foam such as Styrofoam™, polyethylene, polyurethane, and polystyrene, paper, Compolite®, Nomex®, Tedlar®, balsa (wood), plastic, polyester, nylon, and phenolic but is not limited thereto.

[0097] With reference to FIG. 10, the present embodiments include a core lift platform 1000, where the core lift platform 1000 comprises multiple internally arranged rectangular-shaped core cells in core layers 1050, 1055. In many embodiments of the invention, the core lift platform 1000 may be configured for attaching to a lift gate system, which thereby may be configured for mounting at a mounting structure such as, but not limited to, a rear frame of a vehicle, such as a truck or trailer. By way of example and not limitation, the core lift platform 1000 may be installed on a lift gate system attached to a rear opening of a vehicle bed of a vehicle, where the vehicle may include an extension plate. In a number of embodiments, the core lift platform 1000 comprises a platform section 1010 and a foldable section 1020 (also known as a “flipover”) similar to the platform and foldable sections 310, 320 of FIG. 3. In further embodiments, the platform section 1010 and foldable section 1020 may be connected via a number of interlocking units 1030 that may pivotally connect the sections in a manner that allows for folding of the folding section 1020 underneath or onto the platform section 1010 in a similar manner to the interlocking units 330 described in FIG. 3. In still further embodiments, the core lift platform 1000 may be used to lift payloads from one level, e.g., proximate the ground, up to another level, e.g., the vehicle bed of a vehicle, or vice versa.MAX2-P.e46.PCT 21

[0098] In additional embodiments, the lift gate system utilizing the core lift platform 1000 may be a stow away system and the foldable section 1020 may be folded onto the platform section 1010 during stowing of the core lift platform 1000. In still additional embodiments, the core lift platform 1000 may be substantially aligned with the other parts of the lift gate system including, but not limited to, an extension plate. In certain embodiments, a ramp lip 1040 may be positioned at one end of the foldable section 1020 such that the ramp lip 1040 provides a ramping incline from the ground level to the top of the foldable section 1020 and platform section 1010 similar to the ramp lip 340 in FIG.6. In still yet additional embodiments, the internal rectangular-shaped core cells in the core layer 1050 of the foldable section 1020 is visible within the foldable section 1020 allowing for visualization of how the rectangular-shaped core cells may be arranged and spaced in order to provide internal structural support for the core lift platform 1000.

[0099] Similarly, the internal rectangular-shaped core cells 1055 of the platform section 1010 is visible within the platform section 1010. Those skilled in the art can appreciate that although the current cutaway views show the rectangular-shaped core cells in the core layers 1050, 1055 within the platform section 1010 and foldable section 1020, similar structures may also be placed in a similar fashion throughout the core lift platform 1000. In still yet further embodiments, the rectangular-shaped core cell in the core layers 1050, 1055 may provide increased efficiency in weight support on the core lift platform 1000 while also being lighter than other internal structures, thus decreasing overall lift gate system weight and increasing fuel efficiency if the lift gate system is mounted on a vehicle.

[0100] In a variety of embodiments, the size of the platform may be manufactured to meet specific applications. By way of example and not limitation, a total panel thickness may be anywhere from approximately 0.5 to 3 inches, plus a top and a bottom layer thickness. Adhesive component may add some thickness as well. In certain embodiments, a panel including the platform section 1010 and / or the foldable section 1020 may be between approximately 1.50 and 2.00 inches thick, but preferably approximately 1.75 inches thick. In certain other embodiments, a panel including the platform section 1010 and / or the foldable section 1020 may be manufactured to be between approximately 1.8 and 2.2 inches thick, but preferably approximately 2 inches thick. In yet additional embodiments, the top layer and bottom layer may be manufactured to be between approximately 1 / 32 inch and 1 / 4 inch thick, but preferably is approximately 1 / 8 inch. In still additional embodiments, the top and bottom layers may be made of an aluminum alloy including, but not limited to, 6061. Further, in stillMAX2-P.e46.PCT 22more embodiments, the type of aluminum alloy grade may vary depending on the application required but may preferably be T6 grade aluminum. In yet still more embodiments, a film adhesive utilized between the core layers 1050, 1055 and each of the top and bottom layers may be applied to adhere the top and bottom layers to the internal core layers 1050, 1055. In certain more embodiments, the adhesive may be a modified epoxy film adhesive. In more additional embodiments, the sides of the panels including the platform section 1010 and / or the foldable section 1020 may be covered by one or more covers 1065. The one or more covers 1065 may be made from a solid aluminum bar to protect the interior of the panels, such as core layers 1050, 1055, from dust, dirt, and / or the elements.

[0101] With reference to FIGS. 11 A-l 1C, the present embodiments may include a grated flipover section on a lift platform 1100. The lift platform 1100 may include one or more substantially parallel slats 1102 and one more substantially parallel bars 1104. The one or more substantially parallel bars 1104 may be substantially perpendicular to the one or more substantially parallel slats 1102. The structure formed by the one or more substantially parallel slats 1102 and the one or more substantially parallel bars 1104 intersecting the one or more substantially parallel slats 1102 may form a grated core layer 1106. The one or more substantially parallel bars 1104 may be attached on top of and / or in an indentation in the one or more substantially parallel slats 1102. The lift platform 1100 of the present embodiments may further include a core platform section with an interior core layer. The grated flipover section may be connected to the core platform section that may be attached to a truck or trailer. In a variety of embodiments, the grated core layer 1106 of a lift platform 1100 in a lift gate system may be placed within the frame of another type of lift platform. By way of example and not limitation, the embodiment depicted in FIG. 11 A comprises the grated core layer 1106 encompassed by a left plate 1108, a right plate 1110, upper extrusions 1112, and lower extrusions 1114. In certain embodiments, the upper extrusions 1112 and / or the lower extrusions 1114 may be comprised of an aluminum alloy. Those skilled in the art will recognize that the frame that encompasses the grated core layer 1106 may be made out of any suitable material that allows the lift gate system to operate more efficiently. In additional embodiments, the grated core layer 1106 may be covered by solid plating on the top and / or bottom of the grated core layer 1106. Internal gaps inside the grated flipover section may be present that allow for lighter weight construction which results in increased fuel efficiency for vehicles that have the lift platform 1100 attached. In some embodiments, the grated structure formed by the one or more substantially parallel slats 1102 and the one or moreMAX2-P.e46.PCT 23substantially parallel bars 1104 intersecting the one or more substantially parallel slats 1102 in the flipover section of the lift platform 1100 may be applied for a platform section of a lift platform.

[0102] FIG. 12A is an exploded top perspective view of a flipover section with a multi-section core layer on a lift platform, in accordance with an embodiment of the invention. FIG. 12B is a bottom perspective view of a flipover section with a multi-section core layer on a lift platform of FIG. 12A. With reference to FIGS. 12A and 12B, the present embodiments may include a flipover section with a multi-section core layer 1251 in a lift platform 1250. The multi-section core layer 1251 may include multiple core inserts 1252 supported by one or more plates 1253, 1254. Specifically, the flipover section of the lift platform 1250 may include left and right plates 1254, an upper spacer 1256 connected to one ends of the left and right plates 1254, a lower spacer 1257 connected to the other ends of the left and right plates 1255, one or more middle support plates 1253 connecting between the upper spacer 1256 and the lower spacer 1257, and the multiple core inserts 1252. The multiple core inserts 1252 may be encompassed and supported by the upper spacer 1256, the lower spacer 1257, and at least two support plates of one or more middle support plates 1253 and end support plates 1254. Each of the core inserts 1252 may be made of at least one of various materials, such as metal, metal alloy, composite, fibers, fillers, foam such as Styrofoam™, polyethylene, polyurethane, and polystyrene, paper, Compolite®, Nomex®, Tedlar®, balsa (wood), plastic, polyester, nylon, and phenolic but is not limited thereto. Each of the core inserts 1252 may be any kind of combined materials and may further include fibers and / or fillers. In some embodiments, as shown in FIG. 12A, the flipover section of the lift platform 1250 may further comprise a top layer 1258 covering the multiple core inserts 1252 and the one or more supports 1253, 1254. The top surfaces of the multiple core inserts 1252 and the one or more supports 1253 may be glued and attached to the top layer 1258. In some embodiments, the multiple core inserts 1252 and the top layer 1258 may be glued into one piece, but if needed, multiple pieces.

[0103] In some embodiments, a lift platform of the present embodiments may include a flipover section with a multi-portion layer. The multi-portion layer in the flipover section may include multiple portions in a single layer in which the multiple portions are different from each other in at least one of structure and material.

[0104] FIG. 13 is a top exploded perspective view of a platform section of a lift platform with spaced extruded platform segments, in accordance with an embodiment of theMAX2-P.e46.PCT 24invention. With reference to FIG. 13, the present embodiments may include a platform section with multiple spaced extruded platform segments 1354 in a lift platform 1350. Specifically, the platform section of the lift platform 1350 may include a plurality of spaced extruded platform segments 1353, side tubes 1354 each connected to respective ends of the plurality of spaced extruded platform segments 1353, and a top layer 1358 covering the plurality of spaced extruded platform segments 1353 and the side tubes 1354. The multiple extruded platform segments 1353 may be spaced apart from each other and extended in width direction in parallel, and each of spaced extruded platform segments 1353 may have a C- shaped slat structure in a cross section. The top layer 1358 may be attached to top surfaces of the multiple spaced extruded platform segments 1353. The internal spaces formed inside the spaced extruded platform segments 1353 may reduce the weight while the extruded platform segments 1353 provide sufficient strength. The top layer 1358 may include a pattern such as a diamond plate across a top surface.

[0105] FIGS. 14A to 14E depict a lift platform system 1400 with alternate top insert options, in accordance with an embodiment of the invention. FIG. 14A depicts a top perspective view of a lift platform system 1400 with alternate top insert options. The lift platform system 1400 may include a platform assembly 1402 connected to a flipover assembly 1404. The platform assembly 1402 may receive one or more interchangeable inserts 1406, 1408, 1410, 1412, 1430. A first insert 1406 may include a core layer having a repeating structure of cells, such as honeycomb-shaped cells, rectangular-shaped cells, square-shaped cells, and / or polygonal-shaped cells. In some embodiments, the first insert 1406 may further comprise a top layer and a bottom layer on the top and bottom surfaces of the core layer as shown in FIG. 8, and the core layer may comprise a plurality of core cells shown in FIGS. 7A to 10. The first insert 1406 may include a pattern such as a diamond plate across a portion of a top surface but is not limited thereto. A second insert 1408 may include a pattern such as a diamond plate across a top surface. In some embodiments, the second insert 1408 may have spaced extruded platform segments with a top layer as shown in FIG. 13. A third insert 1410 may include a grated structure in which a first set of parallel slats and a second set of parallel bars intersecting the first set are arranged. In some embodiments, the third insert 1410 may have a similar grated structure shown in FIG. 11 A to 11C. A fourth insert 1412 may include extruded platform segments, such as rectangular platform segments joined together. In some embodiments, the fourth insert 1412 may include a section of repeating cells. In some embodiments, the fourth insert 1412 may have a similar structure shown in FIGS. 1 to 2C. AMAX2-P.e46.PCT 25fifth insert 1430 may include multiple portions 1431, 1432, 1433 that are different from each other in at least one of structures and / or materials. For example, a half of the fifth insert 1430 may be a first section 1431 made of metal plate, one quarter of the fifth insert 1430 may be a second section 1432 made of a grated structure, and the remaining portion of the fifth insert 1430 may be a third section 1433 made of composite. The one or more interchangeable inserts 1406, 1408, 1410, 1412, 1430 may be secured in an opening 1414 formed by the platform assembly 1402.

[0106] In some embodiments, the platform assembly 1402 may be connected to the flipover assembly 1404. In this case, the fhpover assembly 1404 may also have a structure where one or more interchangeable inserts are received and fastened in an opening of the flipover assembly 1404. In this case, the one or more interchangeable inserts of the flipover assembly 1404 may include: a plurality of extruded platform segments (121, 221, FIGS. 1 and 2) connected to each other, a core layer (950, 1050, FIGS. 9 and 10) having a repeating series of cells, a grated core layer (1106, FIGS. 11 A to 11C) in which a first set of parallel slats and a second set of parallel bars intersecting the first set are arranged, a multi-section core layer (1251, FIGS. 12A and 12B) including multiple sections and at least one support plate therebetween, and a layer including multiple portions that are different from each other in at least one of structure and material.

[0107] FIG. 14B depicts a bottom perspective view of the lift platform system 1400 of FIG. 14A with alternate top insert options 1406, 1408, 1410, 1412, 1430.

[0108] FIG. 14C depicts a top perspective view of the platform assembly 1402 for receiving an interchangeable insert of the lift platform system 1400 of FIG. 14 A. The platform assembly 1402 may include one or more insert push brackets 1416 for receiving an interchangeable insert from the top. In some embodiments, the flipover assembly 1404 may also include one or more insert push brackets 1417 for receiving an interchangeable insert. The one or more interchangeable inserts shown in FIGS. 14A-14B may be secured in the opening 1414 formed by the platform assembly 1402. The one or more insert push brackets 1416 may be placed over a top portion of the one or more interchangeable inserts and secured via one or more engagement mechanisms 1418 inserted through a portion of the one or more insert push brackets 1416.

[0109] One or more engagement mechanisms may be fasteners 1418 in one embodiment. In other embodiments, said engagement mechanisms may include mechanical fasteners such as Bolts and screws, threaded fasteners used to join materials together,MAX2-P.e46.PCT 26typically with nuts or by threading into materials. Examples may include hex bolts, carriage bolts, machine screws, wood screws, sheet metal screws.

[0110] In other embodiments, said engagement mechanisms may include nuts, such as threaded fasteners that mate with bolts or screws to secure materials. Examples include hex nuts, wing nuts, lock nuts, cap nuts.

[0111] In other embodiments, said engagement mechanisms may include washers, such as used with bolts and screws to distribute load and prevent damage. Examples include flat washers, lock washers, fender washers.

[0112] In other embodiments, said engagement mechanisms may include rivets, such as permanent mechanical fasteners used to join materials by deforming the tail end after insertion. Examples include solid rivets, blind rivets, pop rivets.

[0113] In other embodiments, said engagement mechanisms may include pins, such as cylindrical fasteners used to locate or hold components together. Examples include dowel pins, split pins, cotter pins, clevis pins.

[0114] In other embodiments, said engagement mechanisms may include anchors, such as used to secure fasteners in materials like concrete or drywall. Examples include expansion anchors, toggle bolts, plastic anchors.

[0115] In other embodiments, said engagement mechanisms may include adhesive fasteners, such as tape: pressure-sensitive adhesive on one or both sides, used to bond materials. Examples include duct tape, masking tape, double-sided tape.

[0116] In other embodiments, said engagement mechanisms may include glue, such as liquid adhesive that bonds materials upon curing. Examples include epoxy, super glue, wood glue, polyurethane glue.

[0117] In other embodiments, said engagement mechanisms may include magnetic fasteners, such as magnetic clips: use magnetic force to hold materials together. Examples include magnetic name badges, magnetic cabinet latches.

[0118] In other embodiments, said engagement mechanisms may include magnetic strips, such as flexible magnets used to secure lightweight objects. Examples include refrigerator magnets, magnetic tape.

[0119] In other embodiments, said engagement mechanisms may include interlocking fasteners, such as zippers: interlocking teeth fasteners used in clothing and bags. Examples include coil zippers, invisible zippers, metal zippers.MAX2-P.e46.PCT 27

[0120] In other embodiments, said engagement mechanisms may include hook and loop fasteners, such as two-part fasteners consisting of hooks and loops. Examples include velcro strips, hook-and-loop cable ties.

[0121] In other embodiments, said engagement mechanisms may include snap fasteners, such as interlocking discs used in clothing and accessories. Examples include press studs, snap buttons.

[0122] In other embodiments, said engagement mechanisms may include specialized fasteners, such as cable ties: used to bundle and secure cables and wires. Examples include nylon cable ties, reusable cable ties, metal cable ties.

[0123] In other embodiments, said engagement mechanisms may include clips and clamps, such as used to hold or secure objects in place. Examples include spring clips, hose clamps, binder clips.

[0124] In other embodiments, said engagement mechanisms may include buttons, such as used in clothing to fasten materials together. Examples include sew-on buttons, snap buttons, toggle buttons.

[0125] In other embodiments, said engagement mechanisms may include latches, such as mechanical fasteners that allow for secure closure and easy opening. Examples include toggle latches, cam latches, slam latches.

[0126] In other embodiments, said engagement mechanisms may include innovative fasteners, such as quick-release fasteners: designed for rapid attachment and detachment. Examples include quick-release pins, quick-release buckles.

[0127] In other embodiments, said engagement mechanisms may include reusable fasteners, such as designed for multiple uses without losing efficacy. Examples include reusable zip ties, reusable twist ties.

[0128] In other embodiments, said engagement mechanisms may include tamperresistant fasteners, such as designed to prevent unauthorized removal. Examples include security screws, breakaway bolts.

[0129] FIG. 14D depicts a bottom perspective view of the platform assembly 1402 for receiving the insert connected to the flipover assembly of the lift platform system 1400 of FIG. 14 A. The one or more interchangeable inserts shown in FIGS. 14A-14B may be secured in the opening 1414 formed by the platform assembly 1402. The one or more interchangeable inserts may be secured to the platform assembly 1402 via one or more engagement mechanisms 1420 secured through one or more openings in a bottom portion of the platformMAX2-P.e46.PCT 28assembly 1402. In one embodiment, the one or more engagement mechanisms 1420 may be screws that are secured through one or more openings or apertures in the platform assembly 1402 and one or more corresponding openings or apertures in the one or more interchangeable inserts. The one or more insert push brackets (1416, FIG. 14C) may be used to secure a top portion of the one or more interchangeable inserts to the platform assembly 1402 and the one or more engagement mechanisms 1420 may be used to secure a bottom portion of the one or more interchangeable inserts to the platform assembly 1402.

[0130] FIG. 14E depicts a top view of the platform assembly 1402 for receiving the insert connected to the flipover assembly 1404 of the lift platform system 1400 of FIG. 14 A.

[0131] FIG. 14F depicts a flowchart of a method for assembling and utilizing a lift platform system, in accordance with an embodiment of the invention. With reference to FIG. 14F, the method 1450 may begin with connecting between the flipover assembly and platform assembly via one or more connectors, such as hinge (step 1451). Based on the need for the capacity and fuel efficiency, at least one first interchangeable insert among one or more interchangeable inserts may be selected and respectively placed via at least one of an opening of the platform assembly and flipover assembly from the top (step 1452). Then, one or more insert push brackets may be placed over a top portion of the at least one first interchangeable insert (step 1453), and the first interchangeable insert may be secured to at least one of the platform assembly and flipover assembly via engagement mechanisms inserted through a portion of the insert push brackets (step 1454). With the lift platform system equipped with the first interchangeable insert, first type freights may be loaded and / or unloaded to a vehicle to which the lift platform system is connected (step 1455). If needed, the first interchangeable insert may be interchanged with a second interchangeable insert different from the first interchangeable insert via the opening based on the load capacity and / or fuel efficiency (step 1456). Then, second type freights may be loaded and / or unloaded to the vehicle using the lift platform system equipped with the second interchangeable insert (step 1457).

[0132] FIGS. 15A to 15D depict a lift platform system 1500 with alternate side insert options, in accordance with an embodiment of the invention. FIG. 15A depicts a top perspective view of a lift platform system 1500 with alternate side insert options. The lift platform system 1500 includes a platform assembly that may receive one or more interchangeable inserts 1502, 1504, 1506, 1508, 1530. A first insert 1502 may include a core layer having a repeating structure of cells, such as honeycomb-shaped cells, rectangular-MAX2-P.e46.PCT 29shaped cells, square-shaped cells, and / or polygonal-shaped cells and include a pattern such as a diamond plate across a portion of a top surface. A second insert 1504 may include spaced extruded platform segments and a pattern such as a diamond plate across a top surface. A third insert 1506 may include a grated core layer in which a first set of parallel slats and a second set of parallel bars intersecting the first set are arranged. A fourth insert 1508 may include extruded platform segments, such as rectangular platform segments joined together. In some embodiments, the fourth insert 1508 may include a section of repeating cells. A fifth insert 1530 may include multiple portions 1531, 1532, 1533 that are different from each other in at least one of structures and / or materials. The one or more interchangeable inserts 1502, 1504, 1506, 1508, 1530 may be secured in an opening 1510 formed by the platform assembly. The platform assembly may include platform sides 1512, 1514, a hinge plate 1516 fixedly connected to one ends of the platform sides 1512, 1514, and a back plate 1518 attachably disconnected from the other ends of the platform sides 1512, 1514. The platform sides 1512, 1514 and the hinge plate 1516 may form an opening 1510 surrounded by a U shape of the platform sides 1512, 1514 and the hinge plate 1516. The one or more interchangeable inserts 1502, 1504, 1506, 1508, 1530 may be slid into this U-shaped opening 1510 in a plane substantially parallel to a plane formed by the platform sides 1512, 1514. One side of any one of the one or more interchangeable inserts 1502, 1504, 1506, 1508, 1530 may be connected to the back plate 1518, and the back plate 1518 may be used to secure the one or more interchangeable inserts 1502, 1504, 1506, 1508, 1530 to the platform sides 1512, 1514 once inserted into the U-shaped opening 1510.

[0133] FIG. 15B depicts a bottom perspective view of the lift platform system 1500 of FIG. 15A with alternate inserts 1502, 1504, 1506, 1508, 1530.

[0134] FIG. 15C depicts a top view of a platform assembly for receiving an insert 1508 of the lift platform system 1500 of FIG. 15 A. The platform assembly includes platform sides 1512, 1514 connected to a hinge plate 1516 and a back plate 1518 that may be connected to the insert 1508 and / or platform sides 1512, 1514 of the platform assembly.

[0135] FIG. 15D depicts a bottom view of the platform assembly for receiving an interchangeable insert of the lift platform system 1500 of FIG. 15 A. The platform assembly includes platform sides 1512, 1514 connected to a hinge plate 1516 and a back plate 1518 that may be connected to the insert 1508 and / or platform sides 1512, 1514 of the platform assembly.MAX2-P.e46.PCT 30

[0136] FIG. 15E depicts a flowchart of a method for assembling and utilizing a lift platform system, in accordance with an embodiment of the invention. With reference to FIG. 15E, the method 1550 may begin with disconnecting between the flipover assembly and platform assembly (step 1551). Then, based on the need for the capacity and fuel efficiency, at least one first interchangeable insert among one or more interchangeable inserts may be selected and slid in a plane parallel to the platform and / or flipover assembly into an opening surrounded by a U shape of platform sides and a hinge plate of at least one of the platform assembly and flipover assembly (step 1552). The exposed side portion of the first interchangeable insert surrounded by the U shape may be placed with a back plate (step1553). Then, the back plate may be secured to the first interchangeable insert and / or platform sides of at least one of the platform and flipover assembly via engagement mechanisms (step1554). With the lift platform system equipped with the first interchangeable insert, first type freights may be loaded and / or unloaded to a vehicle to which the lift platform system is connected (step 1555). If needed, the first interchangeable insert may be interchanged with a second interchangeable insert, which is different from the first interchangeable insert, via the opening based on the load capacity and / or fuel efficiency (step 1556). Then, second type freights may be loaded and / or unloaded to the vehicle using the lift platform system equipped with the second interchangeable insert (step 1557).

[0137] FIG. 16A depicts a top perspective view of a platform assembly 1600 for receiving an insert. The platform assembly 1600 includes platform sides 1612, 1614 connected to a hinge plate 1616 and a back plate 1618 that may be connected to an insert (not shown) and / or platform sides 1612, 1614 of the platform assembly 1600.

[0138] FIG. 16B depicts a top perspective view of the platform assembly 1600 for receiving an insert 1604 attached to the back plate 1618. In some embodiments, the back plate 1618 may be attached to the insert 1604 before being slid into the U-shaped opening 1606 of the platform assembly 1600.

[0139] FIG. 16C depicts a top perspective view of the platform assembly 1600 for receiving the insert into the platform sides and hinge plate. In other embodiments, the insert 1604 may be slid into the U-shaped opening of the platform assembly 1600 and then the back plate 1618 may be secured via the one or more engagement mechanisms 1602.

[0140] FIG. 16D depicts a top perspective view of the platform assembly 1600 with the insert 1604 inserted into the platform sides 1612, 1614 and hinge plate 1616 and secured with the back plate 1618.MAX2-P.e46.PCT 31

[0141] FIG. 16E depicts a close-up top perspective view of the platform assembly 1600 showing engagement mechanisms 1602 for securing the back plate 1618 to the insert 1604 and the platform sides 1614. In some embodiments, the engagement mechanisms 1602 may be screws or bolts. Other engagement mechanisms are possible and contemplated.

[0142] FIG. 17 depicts a close-up top perspective view of engagement mechanisms 1702 for securing the platform sides 1714 to the insert 1704 and back plate 1718 of a platform assembly 1700.

[0143] FIG. 18A depicts a top perspective view of a lift platform system 1800 having a platform section 1802 connected to a flipover section 1804 by a hinge. The platform section 1802 and flipover section 1804 may have at least one middle wall 1806 to further secure and / or support the insert 1808. In some embodiments, an opening of the platform section 1802 may be divided by the at least one middle wall 1806 into multiple sub-openings, and the multiple sub-openings may be received with the multiple sub-inserts 1808. Likewise, in some embodiments, an opening of the flipover section 1804 may be divided by the at least one middle wall into multiple sub-openings, and the multiple sub-openings may be received with the multiple sub-inserts.

[0144] FIG. 18B depicts a bottom perspective view of the lift platform system 1800 of FIG. 18A having the platform section 1802 connected to the flipover section 1804 by a hinge.

[0145] FIG. 18C depicts a top view of the lift platform system 1800 of FIG. 18A having the platform section 1802 connected to the flipover section 1804 by a hinge.

[0146] FIG. 18D depicts a bottom view of the lift platform system 1800 of FIG. 18A having the platform section 1802 connected to the flipover section 1804 by a hinge.

[0147] FIG. 18E depicts a side view of the lift platform system 1800 of FIG. 18A having the platform section 1802 connected to the flipover section 1804 by a hinge.

[0148] The present invention has been described in considerable detail with reference to certain preferred versions thereof; however, other versions are possible. Therefore, the spirit and scope of the appended claims should not be limited to the description of the preferred versions contained herein.

[0149] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises"MAX2-P.e46.PCT 32and / or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0150] The corresponding structures, materials, acts, and equivalents of all means or step plus function elements in the claims below are intended to include any structure, material, or act for performing the function in combination with other claimed elements as specifically claimed. The description of the present invention has been presented for purposes of illustration and description but is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the invention. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.

[0151] The above description presents the best mode contemplated for carrying out the present embodiments, and of the manner and process of practicing them, in such full, clear, concise, and exact terms as to enable any person skilled in the art to which they pertain to practice these embodiments. The present embodiments are, however, susceptible to modifications and alternate constructions from those discussed above that are fully equivalent. Consequently, the present invention is not limited to the particular embodiments disclosed. On the contrary, the present invention covers all modifications and alternate constructions coming within the spirit and scope of the present disclosure. For example, the steps in the processes described herein need not be performed in the same order as they have been presented and may be performed in any order(s). Further, steps that have been presented as being performed separately may in alternative embodiments be performed concurrently. Likewise, steps that have been presented as being performed concurrently may in alternative embodiments be performed separately.

[0152] It is contemplated that various combinations and / or sub-combinations of the specific features and aspects of the above embodiments may be made and still fall within the scope of the invention. Accordingly, it should be understood that various features and aspects of the disclosed embodiments may be combined with or substituted for one another in order to form varying modes of the disclosed invention. Further, it is intended that the scopeMAX2-P.e46.PCT 33of the present invention herein disclosed by way of examples should not be limited by the particular disclosed embodiments described above.MAX2-P.e46.PCT 34

Claims

WHAT IS CLAIMED IS:

1. A lift platform system (1400) comprising: a platform assembly (1402) comprising an opening (1414); one or more interchangeable inserts (1406, 1408, 1410, 1412, 1430) configured to be received in the opening (1414) of the platform assembly (1402); and one or more engagement mechanisms (1418, 1420) configured to secure the one or more interchangeable inserts (1406, 1408, 1410, 1412, 1430) in the opening (1414) of the platform assembly (1402).

2. The lift platform system of claim 1, wherein the one or more fastening means (1418, 1420) include one or more insert push brackets (1416) configured to secure the one or more interchangeable inserts (1406, 1408, 1410, 1412, 1430) in the opening (1414) of the platform assembly (1402) via one or more engagement mechanisms (1418) inserted through a portion of the one or more insert push brackets (1416).

3. The lift platform system of claim 1, wherein the platform assembly (1402) includes platform sides (1512, 1514), a hinge plate (1516) fixedly connected to one ends of the platform sides (1512, 1514), and a back plate (1518) attachably disconnected from the other ends of the platform sides (1512, 1514), wherein one side of any one of the one or more interchangeable inserts (1502, 1504, 1506, 1508, 1530) is connected to the back plate (1518), wherein any one of the one or more interchangeable inserts (1502, 1504, 1506, 1508, 1530) connected to the back plate (1518) is slid in a plane parallel to a plane formed by the platform sides (1512, 1514) into the opening (1510) surrounded by a U shape of the platform sides (1512, 1514) and the hinge plate (1516).

4. The lift platform system of claim 1, wherein the one or more interchangeable inserts (1406,1408, 1410, 1412, 1430) comprises a first insert (1412) that includes a plurality of extruded platform segments (111).

5. The lift platform system of claim 4, wherein each of the plurality of extruded platform segments (1200) has complementary connectors (1208, 1210, 1212, 1214) on both sides,MAX2-P.e46.PCT 35and the plurality of extruded platform segments are connected to each other by engaging the complementary connectors (1208, 1210, 1212, 1214).

6. The lift platform system of claim 5, wherein each of the plurality of extruded platform segments (111) has a hollow tube shape, wherein each of the plurality of extruded platform segments (211, 1200) include at least one internal wall structure (212, 1206).

7. The lift platform system of claim 1, wherein the one or more interchangeable inserts (1406,1408, 1410, 1412) comprises a second insert (1406) that includes a core layer having a repeating series of cells (700) and a top layer (310) attached to a top surface of the core layer.

8. The lift platform system of claim 7, wherein the cells (700) of the core layer comprises at least one of honeycomb-shaped cells, rectangular-shaped cells, square-shaped cells, and polygonal-shaped cells.

9. The lift platform system of claim 7, wherein each of the cells (700) of the core layer has a hollow structure defined by thin walls, and the hollow structure of each of the cells is filled with a filler component (956).

10. The lift platform system of claim 1, wherein the one or more interchangeable inserts (1406, 1408, 1410, 1412, 1430) comprises a third insert (1410) that includes a grated structure (1410) in which a first set of parallel slats and a second set of parallel bars intersecting the first set are arranged.

11. The lift platform system of claim 1, wherein the one or more interchangeable inserts (1406, 1408, 1410, 1412, 1430) comprises a fourth insert (1408, 1350) that includes multiple spaced extruded platform segments (1353) and a top layer (1358) attached to top surfaces of the multiple spaced extruded platform segments (1353), wherein the multiple spaced extruded platform segments (1353) are spaced apart from each other and extended in parallel.MAX2-P.e46.PCT 3612. The lift platform system of claim 1, wherein the one or more interchangeable inserts (1406, 1408, 1410, 1412, 1430) comprises a fifth insert that includes multiple portions (1431, 1432, 1433) that are different from each other in at least one of structure and material.

13. The lift platform system of claim 1, wherein the platform assembly (1800) further includes at least one middle wall (1806) that further supports the one or more interchangeable inserts (1808), wherein the one or more interchangeable inserts (1808) includes a sixth insert (1808) that includes multiple sub-inserts (1808).

14. The lift platform system of claim 1, wherein any one of the one or more interchangeable inserts (1406, 1408, 1410, 1412, 1430) is made of at least one of: metal (701), metal alloy (701), foam (702), composite (703), paper, Compolite®, Nomex®, Tedlar®, balsa, plastic, polyester, nylon, phenolic, short fibers (703, 704), long fibers (705), woven fibers (706), particle fibers (707), flake fibers (708), layer fibers (709), and fillers.

15. The lift platform system of claim 1, further comprising a flipover assembly (1404) pivotally connected to the platform assembly (1402).

16. The lift platform system of claim 1, wherein the flipover assembly (1404) is configured to receive at least one of: a plurality of extruded platform segments (121) connected to each other; a cell core layer (950, 1050) having a repeating series of cells, a grated core layer (1106) in which a first set of parallel slats (1102) and a second set of parallel bars (1104) intersecting the first set are arranged, a layer (1251) including multiple sections (1252) and at least one support plate (1253) therebetween, and a layer including multiple portions that are different from each other in at least one of structure and material.

17. A method comprising:MAX2-P.e46.PCT 37placing one interchangeable insert of one or more interchangeable inserts (1406, 1408, 1410, 1412, 1430) via an opening (1414) of the platform assembly (1404) of a lift platform system; fastening the placed interchangeable insert to the platform assembly (1404) with one or more engagement mechanisms (1418, 1420); and interchanging the fastened interchangeable insert with another interchangeable insert of one or more interchangeable inserts (1406, 1408, 1410, 1412, 1430) via the opening (1414) of the platform assembly (1404), wherein the one or more interchangeable inserts (1406, 1408, 1410, 1412, 1430) are different from each other in at least one of structure and material.

18. The method of claim 17, wherein the step of placing one interchangeable insert is placing the interchangeable insert from the top of the platform assembly (1404), wherein the step of fastening the first interchangeable insert includes: placing one or more insert push brackets (1416) over a top portion of the placed interchangeable inserts; and securing the placed interchangeable inserts to the platform assembly (1404) via the one or more engagement mechanisms (1418) inserted through a portion of the one or more insert push brackets (1416).

19. The method of claim 17, wherein the platform assembly (1402) includes platform sides (1512, 1514), a hinge plate (1516) fixedly connected to one ends of the platform sides (1512, 1514), and a back plate (1518) attachably disconnected from the other ends of the platform sides (1512, 1514), wherein one side of the one interchangeable insert is connected to the back plate (1518), wherein the step of placing one interchangeable insert is sliding the one interchangeable insert in a plane parallel to a plane formed by the platform sides (1512, 1514) into the opening (1510) surrounded by a U shape of the platform sides (1512, 1514) and the hinge plate (1516).

20. The method of claim 17, further comprising the step of connecting a flipover assembly (1404) to the platform assembly (1402) so that the flipover assembly (1404) is pivotally folded upon the platform assembly (1402).MAX2-P.e46.PCT 38

Images