Adjustable liftgate platform

Abstract

Systems, devices, and methods including at least one column (12R); a lift platform (11) connected to the column (12R); and a hook bar (34) connected to a bottom portion of the column (12R), wherein the hook bar (34) is configured to be hooked by a dock hook (326) to secure the lift platform (11) to a loading dock when the lift platform (11) is in a stowed position.

Description

PATENT COOPERATION TREATY APPLICATIONTITLE: Adjustable Liftgate PlatformCROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to and the benefit of U.S. Provisional Patent Application No. 63 / 547,804, filed November 8, 2023, and claims priority to and the benefit of Patent Cooperation Treaty Application No. PCT / US24 / 35870 filed June 27, 2024, the contents of all of which are hereby incorporated by reference herein for all purposes.FIELD OF ENDEAVOR

[0002] Embodiments relate generally to lift gates, and more particularly to lift gates for column lifts.BACKGROUND

[0003] One type of a lift gate system comprises a load elevator in the form of a lift gate including a dual lift system having a parallel pair of vertically extending columns, each having a vertically-disposed hydraulic cylinder for vertically raising and lowering a load carried by the pair of cylinders.

[0004] Such a lift gate includes a rigid El-frame having said parallel pair of upstanding columns. The columns contain a corresponding pair of vertically-disposed hydraulic cylinders having runners interconnected by a transverse stabilizing bar typically supporting a two-section foldable lifting platform actuated on each side by an actuating linkage system.

[0005] Lift gates are typically mounted at a structure such as an opening at the rear of a vehicle to lift payloads on a lift platform from one level (e.g., ground level) up to another level (e.g., the bed of the vehicle), and vice versa.SUMMARY

[0006] A system embodiment may include: at least one column; a lift platform connected to the at least one column; and a hook bar connected to the at least one column, wherein the hook bar is configured to be hooked by a dock hook to secure the lift platform to a loading dock when the lift platform is in a stowed position.

[0007] In another embodiment, the at least one column may respectively include at least one runner configured to slide along the at least one column, and wherein each of the lift platform and the hook bar may be connected to the bottom portion of the at least one runner of the at least one column.

[0008] In another embodiment, the hook bar may have an L-shaped channel including a bottom and a side, wherein in an unfolded position of the lift platform, the bottom of the hook bar may face the bottom surface of the lift platform, and the side of the hook bar may face the rear side surface of the lift platform, and in the stowed position of the lift platform, the bottom of the hook bar may face the rear side surface of the lift platform , and the side of the hook bar may face the top surface of the lift platform.

[0009] In another embodiment, the lift platform may be connected to the bottom portion of the at least one runner via at least one side bracket respectively connected to the at least one runner, wherein each of the at least one side bracket may have a shape extending in a first direction and includes two or more apertures arranged in the first direction.

[0010] In another embodiment, one end of each of the at least one side bracket may be connected to the at least one runner, and the two or more apertures of each of the at least one side bracket may be engaged with two or more fasteners connected to sides of the lift platform.

[0011] In another embodiment, the system may further comprise a housing that is connected to the at least one column in such a way that a top plate of the housing is positioned at the same level as that of a bed of a vehicle to which the system is installed, and wherein the engagement between the two or more apertures of the at least one side bracket and the two or more fasteners of the lift platform may adjust a gap between the lift platform and the top plate of the housing.

[0012] In another embodiment, the apertures may have oval shapes to allow for adjustment of the two or more fasteners placed in the respective apertures.

[0013] In another embodiment, the two or more apertures of each of the at least one side bracket may include three or more apertures, wherein the number of apertures of the three or more apertures that are engaged with the two or more fasteners may be more than two and less than the total number of apertures of the three or more apertures.

[0014] In another embodiment, the at least one side bracket may be pivotally connected to the bottom of the at least one runner and configured to rotate the lift platform between a horizontal direction for an unfolded position and a vertical direction for the stowed position.

[0015] In another embodiment, the lift platform may comprise: a platform assembly including an opening; one or more interchangeable inserts configured to be received in the opening of the platform assembly; one or more engagement mechanisms configured to secure the one or more interchangeable inserts in the opening of the platform assembly.

[0016] A system embodiment may include: at least one column configured to be connected to an opening of a vehicle; at least one side bracket connected to the at least one column at one end and including a first engaging member; and a lift platform configured to be connected to the at least one side bracket by engaging between the first engaging member of the at least one side bracket and a second engaging member formed at a side of the lift platform, wherein the first engaging member and the second engaging member may be configured to engage with each other in multiple modes to adjust a gap between a bed of the vehicle and the lift platform.

[0017] In another embodiment, the system may further comprise a hook bar connected to a bottom portion of the at least one column, wherein the hook bar may be configured to be hooked by a dock hook to secure the lift platform to a loading dock when the lift platform is in a stowed position.

[0018] In another embodiment, wherein the at least one column may respectively include at least one runner configured to slide along the at least one column, and wherein the at least one side bracket may be connected to the bottom portion of the at least one runner of the at least one column.

[0019] In another embodiment, wherein each of the at least one side bracket may have a shape extending in a first direction, and wherein the first engaging member may include two or more apertures arranged in the first direction.

[0020] In another embodiment, the second engaging member may be two or more fasteners arranged in a direction in which the lift platform extends, and wherein the lift platform may be configured to be connected to the at least one side bracket by engaging between the two or more apertures and the two or more fasteners.

[0021] In another embodiment, the two or more apertures may have oval shapes to allow for adjustment of the two or more fasteners placed in the respective apertures.

[0022] In another embodiment, the two or more apertures of each of the at least one side bracket may include three or more apertures, wherein the number of apertures of the three or more apertures that are engaged with the two or more fasteners is more than two and less than the total number of apertures of the three or more apertures.

[0023] In another embodiment, the system may further comprise a housing that is connected to the at least one column in such a way that a top plate of the housing is positioned at the same level as that of the bed of the vehicle, and wherein the engagement between the first engaging member and the second engaging member may be configured to adjust a gap between the lift platform and the top plate of the housing.

[0024] In another embodiment, the lift platform may comprise: a platform assembly including an opening; one or more interchangeable inserts configured to be received in the opening of the platform assembly; one or more engagement mechanisms configured to secure the one or more interchangeable inserts in the opening of the platform assembly.

[0025] A system embodiment may include: at least one column; and a lift platform connected to the at least one column; a hook bar connected to the at least one column; and a dock lock comprise a dock hook; wherein the dock hook may be configured to make contact with the hook bar to secure the lift platform to a loading dock when the lift platform is lowered to the dock lock.BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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:

[0027] FIG. 1 shows a lift gate system mounted at a structure such as an opening at the rear of the vehicle, according to one embodiment.

[0028] FIG. 2 shows a perspective view of a lift gate system as mounted on a vehicle opening, according to one embodiment.

[0029] FIG. 3 A shows a partial cut away perspective view of a vehicle secured to a loading dock via a dock lock, according to one embodiment;

[0030] FIG. 3B shows a close-up view of the vehicle secured to the loading dock via the dock lock of FIG. 3 A, according to one embodiment;

[0031] FIG. 4A shows a lift gate system in a stowed position, according to one embodiment;

[0032] FIG. 4B shows the lift gate system of FIG. 4B in an unfolded position, according to one embodiment;

[0033] FIG. 5 shows a closeup of the lift gate system of FIG. 4A with a hook bar for connecting to a dock hook, according to one embodiment;

[0034] FIG. 6 depicts a perspective view of a hook bar for connecting to a dock hook, according to one embodiment;

[0035] FIG. 7A depicts a partially exploded perspective view of a lift gate system having a platform assembly, hook bar, and side brackets for adjusting a platform gap, according to one embodiment;

[0036] FIG. 7B depicts a partially exploded top view of a lift gate system having a platform assembly, hook bar, and side brackets for adjusting a platform gap, according to one embodiment;

[0037] FIG. 8A shows a close-up outside perspective view of a side bracket for adjusting a platform gap before the platform is connected to the lift gate system, according to one embodiment;

[0038] FIG. 8B show a close-up inside perspective view of a side bracket for adjusting a platform gap before the platform is connected to the lift gate system, according to one embodiment;

[0039] FIG. 8C depicts a partially exploded bottom view of a lift gate system having a platform assembly, hook bar, and side brackets for adjusting a platform gap, according to one embodiment;

[0040] FIG. 9 depicts a close-up perspective view of a side bracket for adjusting a platform gap when the platform is in the stowed position, according to one embodiment;

[0041] FIG. 10 depicts a perspective view of an extrusion lift platform of a lift gate system, according to one embodiment;

[0042] FIG. 11 A depicts a side view of an extrusion lift platform of a lift gate system, according to one embodiment;

[0043] FIG. 1 IB depicts a side view of a single extruded platform segment of an extrusion lift platform, according to one embodiment;

[0044] FIG. 11C depicts a side view of two extruded platform segments connected in parallel to form an extrusion lift platform, according to one embodiment;

[0045] FIG. 12 is a perspective view of a core lift platform of a lift gate system, according to one embodiment;

[0046] FIG. 13 A is a perspective view of a single honeycomb-shaped cell of a core layer of a core lift platform, according to one embodiment;

[0047] FIG. 13B depicts various materials of a honeycomb-shaped cell in a magnified view of an M portion in FIG. 13 A, in accordance with embodiments of the invention.

[0048] FIG. 14 is a perspective cutaway view of a core layer of a core lift platform, which comprises a plurality of honeycomb-shaped cells, according to one embodiment;

[0049] FIG. 15 is a perspective cutaway view of a core lift platform with a core layer having a plurality of honeycomb-shaped cells, according to one embodiment;

[0050] FIG. 16 is a perspective cutaway view of a core lift platform with a core layer having a plurality of rectangular-shaped cells, according to one embodiment;

[0051] FIG. 17A is a perspective view of a grated flipover section on a lift platform, according to one embodiment;

[0052] FIG. 17B is a top view of the grated flipover section on the lift platform of FIG. 17 A, according to one embodiment;

[0053] FIG. 17C is a cross-section view of the lift platform of FIG. 17B along line A- A, according to one embodiment;

[0054] FIG. 18A is a top exploded perspective view of a flipover section with multiple inserts and support plates on a lift platform, according to one embodiment;

[0055] FIG. 18B is a bottom perspective view of a flipover section with multiple inserts and support plates on a lift platform, according to one embodiment;

[0056] FIG. 19 is a top exploded perspective view of a platform section of a lift platform with spaced extruded platform segments, according to one embodiment;

[0057] FIG. 20A depicts a top perspective view of a lift gate system with alternate top insert options, according to one embodiment;

[0058] FIG. 20B depicts a bottom perspective view of the lift gate system of FIG. 20A with alternate top insert options, according to one embodiment;

[0059] FIG. 20C depicts a top perspective view of a platform assembly for receiving an insert of FIG. 20A in a state where the platform assembly is connected to a flipover assembly, according to one embodiment;

[0060] FIG. 20D depicts a bottom perspective view of the platform assembly for receiving the insert of FIG. 20A in a state where the platform assembly is connected to the flipover assembly of the lift gate system, according to one embodiment;

[0061] FIG. 20E depicts a top view of the platform assembly for receiving the insert of FIG. 20A in a state where the platform assembly is connected to the flipover assembly , according to one embodiment;

[0062] FIG. 20F depicts a flowchart of a method for assembling and utilizing a lift gate system, according to one embodiment;

[0063] FIG. 21 A depicts a top perspective view of a lift gate system with alternate side insert options, according to one embodiment;

[0064] FIG. 2 IB depicts a bottom perspective view of the lift gate system of FIG. 21 A with alternate side insert options, according to one embodiment;

[0065] FIG. 21C depicts a top view of a platform assembly for receiving an insert of the lift gate system of FIG. 21 A, according to one embodiment;

[0066] FIG. 2 ID depicts a bottom view of the platform assembly for receiving an insert of the lift gate system of FIG. 21 A, according to one embodiment;

[0067] FIG. 2 IE depicts a flowchart of a method for assembling and utilizing a lift gate system, according to one embodiment;

[0068] FIG. 22A depicts a top perspective view of a platform assembly for receiving an insert from the side, according to one embodiment;

[0069] FIG. 22B depicts a top perspective view of the platform assembly for receiving an insert attached to a back plate, according to one embodiment;

[0070] FIG. 22C depicts a top perspective view of the platform assembly for receiving the insert into the platform sides and hinge plate, according to one embodiment;

[0071] FIG. 22D 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, according to one embodiment;

[0072] FIG. 22E depicts a close-up top perspective view of the platform assembly showing engagement mechanisms for securing the back plate to the insert, according to one embodiment;

[0073] FIG. 23 depicts a close-up top perspective view of engagement mechanisms for securing the back plate to the insert and platform sides, according to one embodiment;

[0074] FIG. 24A depicts a top perspective view of a lift gate system having a platform connected to a flipover by a hinge, according to one embodiment;

[0075] FIG. 24B depicts a bottom perspective view of the lift gate system of FIG. 24A having the platform connected to the flipover by a hinge, according to one embodiment;

[0076] FIG. 24C depicts a top view of the lift gate system of FIG. 24 A having the platform connected to the flipover by a hinge, according to one embodiment;

[0077] FIG. 24D depicts a bottom view of the lift gate system of FIG. 24 A having the platform connected to the flipover by a hinge, according to one embodiment; and

[0078] FIG. 24E depicts a side view of the lift gate system of FIG. 24 A having the platform connected to the flipover by a hinge, according to one embodiment.DETAILED DESCRIPTION

[0079] 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.

[0080] The present system may allow for a lift platform that may be adjusted relative to an external surface. In a column lift style lift gate, a portion of the platform 11 may be connected to a portion of a column by a connector, such as via a chain, rod, or the like. The connector may be connected to the column at a moveable portion of column, such as a runner. In some embodiments, the present system may allow for a wedge platform. As the moveable portion is lowered relative to the external surface and / or lift platform, the portion of the lift platform may also be angled downward relative to the external surface and / or lift platform. As the moveable portion is raised relative to the external surface and / or lift platform, the portion of the platform may also be angled upward relative to the external surface and / or platform. In some embodiments, the moveable portion may not move downward or upward unless the platform is in contact with an external surface, such as the ground.

[0081] FIG. 1 shows a lift gate system mounted at a structure such as an opening at the rear of the vehicle, according to one embodiment. The lift gate system 10 may be mounted at a structure such as an opening at the rear of the vehicle 1 in one embodiment. The lift gate system 10 allows lifting payloads on the lift platform 11 from one level (e.g., the ground level) up to another level (e.g., the bed of the vehicle), or vice versa.

[0082] FIG. 2 shows a perspective view of a lift gate system as mounted on a vehicle opening, according to one embodiment. In operation, when the lift platform 11 is raised to the vehicle bed of vehicle 1, there is substantially continuous surface from the vehicle bed to the lift platform 11 to ease movement of loads between the vehicle bed and the lift platform 11. The vehicle 1 may be a truck with a rear opening, suitable for installing the lift gate system 10. In one embodiment, the lift gate system 10 may comprise a load elevator in the form of alift gate. The lift gate system 10 may provide a dual lift system including said parallel pair of vertically extending columns 12L, 12R, each having a vertically-disposed hydraulic cylinder for vertically raising and lowering the lift platform 11 with a load carried by the pair of cylinders.

[0083] Specifically, the lift gate system 10 may include a rigid H-frame having said parallel pair of upstanding left and right columns 12L, 12R and the lift platform 11 supported between the left and right column 12L, 12R . The left and right columns 12L, 12R may contain a corresponding pair of vertically-disposed hydraulic cylinders having runners 13R, 13L, and the runners 13R, 13L of left and right columns 12L, 12R may be configured to slide along the left and right columns 12L, 12R to vertically raise and lower the lift platform 11. The pair of vertically-disposed hydraulic cylinders having runners 13R, 13L may be interconnected by a transverse stabilizing bar supporting the lift platform 11. The lift platform 11 may be connected to the left and right column 12L, 12R by connectors, such as via a chain, rod, or the like and configured to be raised or lowered according to the vertical movements of the runners 13R, 13L. The lift platform 11 may be actuated on each side by an actuating linkage system to fold or unfold the lift platform 11.

[0084] The lift gate system 10 may be mounted at a structure such as an opening at the rear of the vehicle 1 using a mounting system in one embodiment. The lift gate system 10 allows lifting payloads on the platform 11 from one level (e.g., the ground level) up to another level (e.g., the bed of the vehicle), or vice versa. In some embodiments, the lift gate system 10 may include a housing 80 placed between left and right columns 12L, 12R to house one or more configuration required to operate the lift gate system 10 (e.g., batteries, etc.) In this case, the housing 80 may be positioned in such a way that the top plate of the housing 80 is positioned at the same level as the bed of the vehicle 1.

[0085] FIG. 3 A shows a partial cut away perspective view of a vehicle 1 secured to a loading dock 30 via a dock lock 32. The vehicle 1 may include a lift gate system 10 with a lift platform 11 in a stowed position. The lift platform 11 may be lowered to the dock lock 32, which secures the vehicle 1 equipped with the lift gate system 10 to the loading dock 30 via contact with a hook bar 34 of the lift gate system 10. The hook bar 34 may be connected to bottom portions of the left and right columns 12L, 12R.

[0086] FIG. 3B shows a close-up view of the vehicle (1, FIG. 3A) secured to the loading dock (30, FIG. 3A) via the dock lock 32 of FIG. 3A. The dock lock 32 may include a dock body 322, a dock leg 324, and a dock hook 326. The dock hook 326 may be configured to make contact with and hook the hook bar 34 to secure the vehicle to the loading dock. Thehook bar 34 may include two bar mount brackets 36, 38 that connect the hook bar 34 to respective bottom portion of runners 13L, 13R of the left and right columns 12L, 12R of the lift gate system via one or more fasteners 39, such as bolts.

[0087] FIG. 4A shows a lift gate system 10 in a stowed position 40. The lift platform 11 may include two or more sections that are folded together. The hook bar 34 may be attached at a bottom portion of the left and right columns 12L, 12R of the lift gate system 10.

[0088] FIG. 4B shows the lift gate system 10 of FIG. 4B in an unfolded position 41. The lift platform 11 may include two or more sections that are unfolded to allow objects to be raised to the bed of vehicle and / or lowered to a ground. The hook bar 34 may be attached at a bottom portion of the left and right columns 12L, 12R of the lift gate system 10.

[0089] FIG. 5 shows a closeup of the lift gate system 10 of FIG. 4 A with a hook bar 34 for connecting to a dock hook. FIG. 5 shows a connecting structure of the bottom portion of the left column 12L, the hook bar 34, and the lift platform 11. A connecting structure of the bottom portion of the right column (12R, FIG. 4), the hook bar 34, and the lift platform 11 may be formed in the same manner as that of the left column 12L. Referring to FIGS. 3B to 5, the hook bar 34 may be secured to the runners 13L, 13R of the left and right columns 12L, 12R of the lift gate system 10 via one or more fasteners 39, such as bolts, and the lift platform 11 may also be secured to the runners 13L, 13R near the hook bar 34.

[0090] FIG. 6 depicts a perspective view of a hook bar 34 for connecting to a dock hook. The hook bar 34 may include two bar mount brackets 36, 38 that connect the hook bar 34 to respective left and right columns (12L, 12R, FIGS. 4A and 4B) of the lift gate system. The shape of the hook bar 34 may be any shape that allows the dock hook 326 to properly function while providing ease of manufacturing. In some embodiments, the hook bar 34 may include an L-shaped channel including a bottom portion 34B and a side portion 34S. In some embodiments, the two bar mount brackets 36, 38 may have a curved shape.

[0091] FIGS. 7 A to 7B depict partially exploded views of a lift gate system 10 having a lift platform 11, hook bar 34, and side brackets 70 for adjusting a platform gap, according to some embodiments. FIG. 7A depict a partially exploded top perspective view of the lift gate system 10, and FIG. 7B depict a partially exploded top view of the lift gate system 10. Referring to FIGS. 7A and 7B, the lift platform 11 may be connected to the bottom portion of the left runner 13L of left column 12L and the right runner 13R of right column 12R via the side brackets 70 respectively connected to the left and right runners 13L, 13R. The side brackets 70 may have a shape extending in one direction, and one ends of the side brackets 70 may be pivotally connected to the bottom of the runners 13L, 13R. The other portion of theside brackets 70 may be connected to the lift platform 11 and configured to rotate the lift platform 11 between a horizontal direction for an unfolded position and a vertical direction for the stowed position. The side brackets 70 and the lift platform 11 may be connected by engaging between a first engaging member included in the side brackets 70 and a second engaging member formed at a side of the lift platform 11. The first engaging member 72 and the second engaging member 74 may be configured to engage with each other in multiple modes to adjust a gap between a bed of the vehicle and the lift platform 11. In some embodiments, the first engaging member 72 may include two or more apertures arranged in the one direction, and the second engaging member 74 may be two or more fasteners 74 arranged in a direction in which the lift platform 11 extends. In this case, the multiple modes may include a first mode where two apertures 72 and two fasteners 74 are engaged to adjust the gap to a first distance and a second mode where three apertures 72 and three fasteners 74 are engaged to adjust the gap to a second distance which is narrower than the first distance. In other embodiments, the first engaging member included in the side brackets 70 may be two or more fasteners arranged in the one direction, and the second engaging member formed at a side of the lift platform 11 may be two or more apertures arranged in a direction in which the lift platform 11 extends so that the first and second engaging members are engaged with each other.

[0092] Meanwhile, as mentioned above, the hook bar 34 may be secured to the runners 13L, 13R of the left and right columns 12L, 12R via the bar mount bracket 36, 38, respectively. In some embodiments, the hook bar 34 may be positioned behind the side brackets 70 on the runners 13L, 13R. In this case, as shown in FIGS. 6, 7A, and 7B, each of the bar mount bracket 36, 38 connected to both ends of the hook bar 34 may have a curved shape including at least one curve. The curved shapes of the bar mount bracket 36, 38 may be configured to provide a sufficient space for the side brackets 70 to be connected to the runners 13L, 13R.

[0093] In some embodiments, as shown in FIGS. 6 and 7B, the hook bar 34 may include an L-shaped channel including the bottom portion 34B and the side portion 34S. In an unfolded position of the lift platform 11 as shown in FIGS. 4B, 5, 7A to 7B, the bottom portion 34B of the L-shaped channel of the hook bar 34 may face and / or be in contact with the bottom surface 1 IB of the lift platform 11, and the side portion 34S of the L-shaped channel of the hook bar 34 may face and / or be in contact with the side surface 11 S of the lift platform 11. In a stowed or folded position of the lift platform 11 as shown in FIG. 4A, the bottom portion 34B of the L-shaped channel of the hook bar 34 may face and / or be in contactwith the side surface 1 IS of the lift platform 11, and the side portion 34S of the L-shaped channel of the hook bar 34 may face and / or be in contact with the top surface 1 IT of the lift platform 11.

[0094] As described above, the lift gate system 10 may comprise the housing 80 that is connected to the left and right columns 12L, 12R. Referring to FIG. 7B, in some embodiments where the hook bar 34 is located between the housing 80 and the lift platform 11, the curved shapes of two bar mount brackets 36, 38 may be configured to allow spaces for the side brackets 70 and the housing 80, thereby contributing decrease of the platform gap between the lift platform 11 and the housing 80.

[0095] FIGS. 8A to 8C show close-up views of a side bracket 70 for adjusting a platform gap 76 before the platform 11 is connected to the left and right columns (12L, 12R, FIGS. 7A and 7B) of the lift gate system. FIG. 8A shows a close-up perspective views of a side bracket 70 from the outside of the lift gate system, FIG. 8B shows a close-up perspective views of the side bracket 70 from the inside of the lift gate system, and FIG. 8C depict a close-up partially exploded bottom view of the lift gate system 10. Referring to FIGS. 8A to 8C, each of the side bracket 70 may have a shape extending in one direction and include two or more apertures 72 arranged in the same direction. That is, one ends of the side brackets 70 may be respectively connected to the left and the right runner 13L, 13R of left and right columns 12L, 12R, and the two or more apertures 72 of the side brackets 70 may be engaged with two or more fasteners 74 connected to sides of the lift platform 11. In this case, the two or more fasteners (74) may be arranged in a direction in which the lift platform 11 extends. In some embodiments, the apertures 72 may be oval to allow for adjustment of the two or more fasteners 74 placed in the respective apertures 72.

[0096] In some embodiments, the lift gate system 10 may further comprise the housing 80 that is connected to the left and right columns 12L, 12R in such a way that a top plate 82 of the housing 80 is positioned at the same level as that of a bed of a vehicle to which the system 10 is installed. In this case, the engagement between the two or more apertures 72 of the side brackets 70 and the two or more fasteners 74 of the lift platform 11 may be configured to adjust a gap 76 between the lift platform 11 and the top plate 82 of the housing 80. In other words, the placement of the two or more fasteners 74 in the two or more apertures 72 of the side bracket 70 may be used to adjust the gap 76 between the lift platform 11 and a housing top plate 82 of the housing 80. After assembling the unit together, the gap 76 between the lift platform 11 and the housing top plate 82 may be determined depending on the tolerances of many parts (e.g., column, runner, pads, platform, housing top plate, and thelike) and may be adjusted using the disclosed method. In some embodiments, a gap between the platform and the housing top plate may be about 0.5”. With a 6600 pound load, that gap may be reduced to about 1 / 8”. In some embodiments, the gap may be about 0.75”. If tolerances are to “minus” side, the gap may be from about 0.44” to about 0.5”. If tolerances are to “plus” side, the gap may be from about 1.0” to 1.25,” which is large, and this may cause a problem for pushing a cart through the gap.

[0097] In some embodiments where the hook bar 34 is located between the housing 80 and the lift platform 11, and the placement of the two or more fasteners 74 may be used to adjust the gap between the lift platform 11 and the hook bar 34 located ahead the housing top plate 82 of the housing 80. In some embodiments, the two or more apertures 72 of each of the side brackets 70 may include three or more apertures, and the number of apertures that are engaged with the two or more fasteners 74 may be more than two and less than the total number of apertures to adjust a platform gap between the lift platform 11 and the vehicle bed. For example, each of the side brackets 70 may include three apertures, and only two of the three apertures may be engaged with fasteners 74 of the lift platform 11.

[0098] FIG. 9 depicts a close-up perspective view of a side bracket 70 for adjusting a platform gap when the platform 11 is in the stowed position. The platform 11 may be connected to the lift gate system 10 via the two or more fasteners 74 in the two or more apertures 72 of the side bracket 70. The side brackets 70 may be pivotally connected to the runners (13R, 13L, FIGS. 7A and 7B) of the right and left columns (12R, 12L, FIGS. 7A and 7B). In the unfolded position of the lift platform 11, as shown in FIGS. 7 A to 8C, the side brackets 70 may be positioned to extend horizontally and unfold the lift platform 11. To switch from the unfolded position to a stowed position, the side brackets 70 may be pivotally rotated from the horizontal direction parallel to the ground to the vertical direction parallel to the right and left columns (12R, 12L, FIGS. 7A and 7B). As shown in FIG. 9, the side brackets 70 may be positioned to extend vertically and unfold or stow the lift platform 11, and the lift platform 11 connected to the side brackets 70 may be positioned vertically in a direction according to the rotation of the side brackets 70.

[0099] FIGS. 10 to 24E depict various lift platforms that may be included in lift gate systems, according to some embodiments. In some embodiments, the lift platform 11 of lift gate systems shown in FIGS. 1 to 9 may be any one of lift platforms shown in FIGS. 10 to 24E. Referring to FIGS. 10 to 24E, the lift platforms 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 toone another based on the required capacity and weight according to the multiple purposes of the lift platforms of lift gate systems. The one or more interchangeable inserts may provide increased efficiency in weight support and fuel efficiency when the lift gate system is mounted on a vehicle.

[0100] In some embodiments, the lift gate 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.

[0101] In some embodiments, the lift gate 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, squareshaped 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 core layer, 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 thebottom 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.

[0102] In some embodiments, the lift gate 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.

[0103] In some embodiments, the lift gate 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.

[0104] Specifically, with reference to FIG. 10, the disclosed lift gate system may include an extrusion lift platform 100. The lift gate system including 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 lift gate system with 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 system 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.

[0105] 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 foldable section 120 may be connected via a number of interlocking units 130 that may pivotallyconnect 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 gate 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.

[0106] FIG. 11 A depicts a side view of a lift platform 200 of a lift gate system, in accordance with an embodiment of the invention. In some embodiments, the side view of the lift platform 100 shown in FIG. 10 may be similar to that of the lift platform 200. With reference to FIG. 11 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. 10. 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. 10, 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 some embodiments, the two spaced internal wall structures 212 may be inclined in different directions, and the two spaced internal wallstructures 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

[0107] 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. 10.

[0108] FIG. 1 IB depicts a side view of a single extruded platform segment of an extrusion lift platform, in accordance with an embodiment of the invention. FIG. 11C 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 FIG. 1 IB and 11C, 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 segmentsl200 may be connected to the connection 132 in parallel to form an extrusion lift platform 1300. In some embodiments, the connection 132 may include welding adjacent extruded platform segments 1200 together. In some embodiments, the connection132 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. 11 A) in the platform section (210, FIG. 11 A) and / or the extruded platform segments (221, FIG. 11 A) in the flipover section (220, FIG. 11 A) may also be connected to each other by the methods described above.

[0109] FIG. 12 is a perspective view of a core lift platform of a lift gate system, in accordance with an embodiment of the invention. With reference to FIG. 12, 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. 14), 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 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.

[0110] 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 (notpictured) with a solid external top layer 310 and bottom layer with similar external covers on the sides of the platform section 350.

[0111] 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.

[0112] 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. 15) such as foam or other similar materials 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.

[0113] While a variety of core lift platforms are described above with reference to FIG. 12, 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 thicknessand / 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.

[0114] With reference to FIG. 13 A, 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#, 14-5.2#, 3 / 16-5.7#, 3 / 8-2.3#, 14-4.5#, and / or 14-2.3#, where X / X is cell size in inches and X.X# is honeycomb density in Pounds per Cubic Foot.

[0115] 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.

[0116] In various embodiments, the honeycomb-shaped core cell 700 and resulting core layer (950, FIG. 15) 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. 13B depicts various materials of a honeycomb-shaped core cell in a magnified view of an M portion in FIG. 13 A, in accordance with embodiments of the invention. With reference to FIGS. 13A and 13B, in various embodiments, the honeycomb-shaped core cell 700 and resulting core layer may bemanufactured 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.

[0117] 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.

[0118] 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 discontinuously distributed 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 thanthree 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.

[0119] 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.

[0120] With reference to FIG. 14, 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 14 inch in thickness.

[0121] In the embodiment shown in FIG. 14, the cell layer 830 comprises a series of honeycomb structures similar to the honeycomb structures described in the discussion of FIG. 13A. 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. 16. 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 heightof 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.

[0122] FIG. 15 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. 15, 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.

[0123] 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 gate 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.

[0124] 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 canappreciate 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.

[0125] 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.

[0126] 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 aluminum alloy 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, andpolystyrene, paper, Compolite®, Nomex®, Tedlar®, balsa (wood), plastic, polyester, nylon, and phenolic but is not limited thereto.

[0127] With reference to FIG. 16, 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. 12. 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. 12. 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.

[0128] 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. 12. 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.

[0129] 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 inthe 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.

[0130] 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 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 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.

[0131] With reference to FIGS. 17A-17C, 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 moresubstantially 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. 17A 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 more substantially 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.

[0132] FIG. 18A 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. 18B is a bottom perspective view of a flipover section with a multi-section core layer on a lift platform of FIG. 18A. With reference to FIGS. 18A and 18B, 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 ofvarious 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. 18 A, 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.

[0133] 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.

[0134] FIG. 19 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. With reference to FIG. 19, 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.

[0135] FIGS. 20A to 20E depict a lift platform 1400 of a lift gate system with alternate top insert options, in accordance with an embodiment of the invention. FIG. 20A depicts a top perspective view of a lift platform 1400 with alternate top insert options. The lift platform 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. 14, and the core layer may comprise a plurality of core cells shown in FIGS. 13A to 16. 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. 19. 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. 17A to 17C. 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. 10 to 11C. A fifth 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.

[0136] 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. 10 and 11 A) connected to each other, a core layer (950, 1050, FIGS. 15 and 16) having a repeating series of cells, a grated core layer (1106, FIGS. 17A to 17C) in which a first set of parallel slats and a second set of parallel bars intersecting the fir5sst set are arranged, a multisection core layer (1251, FIGS. 18A and 18B) 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.

[0137] FIG. 20B depicts a bottom perspective view of the lift platform 1400 of FIG. 20A with alternate top insert options 1406, 1408, 1410, 1412, 1430.

[0138] FIG. 20C depicts a top perspective view of the platform assembly 1402 for receiving an interchangeable insert of the lift platform 1400 of FIG. 20A. 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. 20A-20B 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.

[0139] 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, typically with nuts or by threading into materials. Examples may include hex bolts, carriage bolts, machine screws, wood screws, sheet metal screws.

[0140] 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.

[0141] 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.

[0142] 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.

[0143] 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.

[0144] 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.

[0145] 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.

[0146] 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.

[0147] 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.

[0148] 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.

[0149] 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.

[0150] 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.

[0151] 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.

[0152] 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.

[0153] 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.

[0154] 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.

[0155] 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.

[0156] 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.

[0157] 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.

[0158] In other embodiments, said engagement mechanisms may include tamperresistant fasteners, such as designed to prevent unauthorized removal. Examples include security screws, breakaway bolts.

[0159] FIG. 20D depicts a bottom perspective view of the platform assembly 1402 for receiving the insert connected to the flipover assembly of the lift platform 1400 of FIG. 20 A. The one or more interchangeable inserts shown in FIGS. 20A-20B 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 platform assembly 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. 20C) 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.

[0160] FIG. 20E depicts a top view of the platform assembly 1402 for receiving the insert connected to the flipover assembly 1404 of the lift platform 1400 of FIG. 20 A.

[0161] FIG. 20F depicts a flowchart of a method for assembling and utilizing a lift platform of a lift gate system, in accordance with an embodiment of the invention. With reference to FIG. 20F, 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 engagementmechanisms inserted through a portion of the insert push brackets (step 1454). With the lift platform equipped with the first interchangeable insert, first type freights may be loaded and / or unloaded to a vehicle to which the lift gate system including the lift platform 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 equipped with the second interchangeable insert (step 1457).

[0162] FIGS. 21 A to 21D depict a lift platform 1500 of a lift gate system with alternate side insert options, in accordance with an embodiment of the invention. FIG. 21 A depicts a top perspective view of a lift platform 1500 with alternate side insert options. The lift platform 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-shaped 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 moreinterchangeable inserts 1502, 1504, 1506, 1508, 1530 to the platform sides 1512, 1514 once inserted into the U-shaped opening 1510.

[0163] FIG. 2 IB depicts a bottom perspective view of the lift platform 1500 of FIG. 21 A with alternate inserts 1502, 1504, 1506, 1508, 1530.

[0164] FIG. 21C depicts a top view of a platform assembly for receiving an insert 1508 of the lift platform 1500 of FIG. 21A. 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.

[0165] FIG. 2 ID depicts a bottom view of the platform assembly for receiving an interchangeable insert of the lift platform 1500 of FIG. 21A. 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.

[0166] FIG. 2 IE depicts a flowchart of a method for assembling and utilizing a lift platform of a lift gate system, in accordance with an embodiment of the invention. With reference to FIG. 21E, 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 equipped with the first interchangeable insert, first type freights may be loaded and / or unloaded to a vehicle to which the lift gate system including the lift platform 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 equipped with the second interchangeable insert (step 1557).

[0167] FIG. 22 A 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.

[0168] FIG. 22B 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.

[0169] FIG. 22C 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.

[0170] FIG. 22D 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.

[0171] FIG. 22E 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.

[0172] FIG. 23 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.

[0173] FIG. 24A depicts a top perspective view of a lift platform 1800 of a lift gate system 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 subopenings, 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.

[0174] FIG. 24B depicts a bottom perspective view of the lift platform 1800 of FIG. 24A having the platform section 1802 connected to the flipover section 1804 by a hinge.

[0175] FIG. 24C depicts a top view of the lift platform 1800 of FIG. 24A having the platform section 1802 connected to the flipover section 1804 by a hinge.

[0176] FIG. 24D depicts a bottom view of the lift platform 1800 of FIG. 24A having the platform section 1802 connected to the flipover section 1804 by a hinge.

[0177] FIG. 24E depicts a side view of the lift platform 1800 of FIG. 24A having the platform section 1802 connected to the flipover section 1804 by a hinge.

[0178] 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 scope of the present invention herein disclosed by way of examples should not be limited by the particular disclosed embodiments described above.

Claims

AMENDED CLAIMS received by the International Bureau on 13 May 2025 (13.05.2025)1. A system (10) comprising: at least one column (12R); a lift platform (11) connected to the at least one column (12R); and a hook bar (34) connected to a bottom portion of the at least one column (12R), wherein the hook bar (34) is configured to be hooked by a dock hook (326) to secure the lift platform (11) to a loading dock when the lift platform (11) is in a stowed position.

2. The system of claim 1, wherein the at least one column (12R) respectively includes at least one runner (13R) configured to slide along the at least one column (12R), and wherein each of the lift platform (11) and the hook bar (34) is connected to the bottom portion of the at least one runner (13R) of the at least one column (12R).

3. The system of claim 2, wherein the hook bar (34) has an L-shaped channel including a bottom (34B) and a side (34S), wherein in an unfolded position of the lift platform (11), the bottom (34B) of the hook bar (34) faces the bottom surface (1 IB) of the lift platform (11), and the side (34S) of the hook bar (34) faces the rear side surface (1 IS) of the lift platform (11), and in the stowed position of the lift platform (11), the bottom (34B) of the hook bar (34) faces the rear side surface (1 IS) of the lift platform (11), and the side (34S) of the hook bar (34) faces the top surface of the lift platform (11).

4. The system of claim 2, wherein the lift platform (11) is connected to the bottom portion of the at least one runner (13R) via at least one side bracket (70) respectively connected to the at least one runner (13R), wherein each of the at least one side bracket (70) has a shape extending in a first direction and includes two or more apertures (72) arranged in the first direction.

5. The system of claim 4, wherein one end of each of the at least one side bracket (70) is connected to the at least one runner (13R), and the two or more apertures (72) of each of the at least one side bracket (70) are engaged with two or more fasteners (74) connected to sides of the lift platform (11).

6. The system of claim 5, further comprising a housing (80) that is connected to the at least one column (12R) in such a way that a top plate (82) of the housing (80) is positioned at the same level as that of a bed of a vehicle to which the system (10) is installed, and wherein the engagement between the two or more apertures (72) of the at least one side bracket (70) and the two or more fasteners (74) of the lift platform (11) adjusts a gap (76) between the lift platform (11) and the top plate (82) of the housing (80).

7. The system of claim 5, wherein the apertures (72) have oval shapes to allow for adjustment of the two or more fasteners (74) placed in the respective apertures (72).

8. The system of claim 5, wherein the two or more apertures (72) of each of the at least one side bracket (70) include three or more apertures, wherein the number of apertures of the three or more apertures that are engaged with the two or more fasteners (74) is more than two and less than the total number of apertures of the three or more apertures.

9. The system of claim 5, wherein the at least one side bracket (70) is pivotally connected to the bottom of the at least one runner (13R) and configured to rotate the lift platform (11) between a horizontal direction for an unfolded position and a vertical direction for the stowed position.

10. The system of claim 1, wherein the lift platform (11) comprises: a platform assembly (1402) including 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); 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).

11. A system (10) comprising: a lift platform (11) configured to be connected to a frame;a support mechanism disposed between the frame and the lift platform to support the lift platform on the frame, wherein the support mechanism includes an adjustable engagement mechanism configured for selectively adjusting a distance between the lift platform and the frame.

12. The system of claim 11, wherein the adjustable engagement mechanism is disposed between the frame and the lift platform to support the lift platform on the frame, wherein the engagement mechanism is adjustable in multiple modes to adjust a gap between the frame and the lift platform.

13. The system of claim 12 wherein the adjustable engagement mechanism comprises: at least one side bracket (70) configured to connect to the frame at one end, wherein the at least one side bracket (70) comprises a first engaging member (72), wherein the lift platform (11) is configured to be connected to the at least one side bracket (70) by engaging between the first engaging member (72) of the at least one side bracket (70) and a second engaging member (74) formed at a side of the lift platform (11).

14. The system of claim 13, wherein the first engaging member (72) and the second engaging member (74) are configured to engage with each other in multiple modes to adjust a gap between the frame and the lift platform (11).

15. The system of claim 14, further comprising a hook bar (34) configured for adjustable connection to a portion of at least one column (12R), in a gap between the lift platform and the frame.

16. The system of claim 15, wherein the at least one column (12R) respectively includes at least one runner (13R) configured to slide along the at least one column (12R), and wherein the at least one side bracket (70) is connected to the bottom portion of the at least one runner (13R) of the at least one column (12R).

17. The system of claim 16, wherein each of the at least one side bracket (70) has a shape extending in a first direction, andwherein the first engaging member (72) includes two or more apertures (72) arranged in the first direction.

18. The system of claim 14, wherein the second engaging member (74) comprises two or more fasteners (74) arranged in a direction in which the lift platform (11) extends, and wherein the lift platform (11) is configured to be connected to the at least one side bracket (70) by engaging between the two or more apertures (72) and the two or more fasteners (74).

19. The system of claim 15, further comprising a housing (80) that is connected to the at least one column (12R) in such a way that a top plate (82) of the housing (80) is positioned at the same level as that of the bed of the vehicle, and wherein the engagement between the first engaging member (72) and the second engaging member (74) is configured to adjust a gap between the lift platform (11) and the top plate (82) of the housing (80).

20. The system of claim 11, wherein the lift platform (11) comprises: a platform assembly (1402) including 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); 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).

21. A system (10) comprising: at least one side bracket (70) configured to connect to a frame at one end, wherein the at least one side bracket (70) comprises a first engaging member (72); and a lift platform (11) configured to be connected to the at least one side bracket (70) by engaging between the first engaging member (72) of the at least one side bracket (70) and a second engaging member (74) formed at a side of the lift platform (11); wherein the first engaging member (72) and the second engaging member (74) are configured to engage with each other in multiple modes to adjust a gap between the frame and the lift platform (11).

22. The system of claim 21, further comprising at least one column (12R) configured to be connected to an opening of a vehicle.

23. The system of claim 22, wherein the frame comprises the at least one column (12R).

24. The system of claim 22, further comprising: a hook bar (34) configured for connection to a portion of the at least one column (12R).

25. The system of claim 24, wherein the hook bar (34) has an L-shaped channel including a bottom (34B) and a side (34S); wherein in an unfolded position of the lift platform (11), the bottom (34B) of the hook bar (34) faces the bottom surface (1 IB) of the lift platform (11), and the side (34S) of the hook bar (34) faces the rear side surface (1 IS) of the lift platform (11); and wherein in the stowed position of the lift platform (11), the bottom (34B) of the hook bar (34) faces the rear side surface (1 IS) of the lift platform (11), and the side (34S) of the hook bar (34) faces the top surface of the lift platform (11).

26. The system of claim 21, further comprising a hook bar (34) configured for adjustable connection to a portion of the at least one column (12R), in a gap between the lift platform and the frame.

27. The system of claim 21, wherein the at least one column (12R) respectively includes at least one runner (13R) configured to slide along the at least one column (12R), and wherein the at least one side bracket (70) is connected to the bottom portion of the at least one runner (13R) of the at least one column (12R).

28. The system of claim 21, wherein each of the at least one side bracket (70) has a shape extending in a first direction, and wherein the first engaging member (72) includes two or more apertures (72) arranged in the first direction.

29. The system of claim 28, wherein the second engaging member (74) comprises two or more fasteners (74) arranged in a direction in which the lift platform (11) extends, andwherein the lift platform (11) is configured to be connected to the at least one side bracket (70) by engaging between the two or more apertures (72) and the two or more fasteners (74).

30. The system of claim 29, wherein the two or more apertures (72) have oval shapes to allow for adjustment of the two or more fasteners (74) placed in the respective apertures (72).

31. The system of claim 21, further comprising a housing (80) that is connected to the at least one column (12R) in such a way that a top plate (82) of the housing (80) is positioned at the same level as that of the bed of the vehicle, and wherein the engagement between the first engaging member (72) and the second engaging member (74) is configured to adjust a gap between the lift platform (11) and the top plate (82) of the housing (80).

32. The system of claim 21, wherein the lift platform (11) comprises: a platform assembly (1402) including 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); 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).

33. A system comprising: at least one column (12R); and a lift platform (11) connected to the at least one column; a hook bar (34) connected to the at least one column (12R); and a dock lock (32) comprise a dock hook (326); wherein the dock hook (326) is configured to make contact with the hook bar (34) to secure the lift platform (11) to a loading dock when the lift platform (11) is lowered to the dock lock (32).

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