Load platform lifting device

Abstract

To provide a load receiving platform lifting device having high safety and higher convenience.SOLUTION: A load receiving platform lifting and lowering device mounted to constitute a part of a vehicle, comprising a load receiving platform, a lifting and lowering mechanism configured to lift and lower the load receiving platform, and a fence member attached to the load receiving platform, wherein the load receiving platform includes a load receiving surface portion configured to form an upper surface in a state where a load can be placed thereon, a back surface forming portion configured to form a surface facing a ground in the same state, and a side surface forming portion configured to form a side surface in the same state, and the fence member changes its posture between an in-use posture and an out-of-use posture, when the posture is changed from the non-use posture to the use posture, at least a part of the fence member moves in a range including a position separated from the back surface forming portion in the up-down direction and a position separated from a side of the side surface forming portion outward in the lateral direction, and when the fence member is in the use posture, at least a part of the fence member is positioned in a range from a side of the side surface forming portion outward in the lateral direction to a position above the load receiving surface portion.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a platform lifting device that is attached to a vehicle mainly used for transporting luggage. [Background technology]

[0002] BACKGROUND ART Conventionally, some trucks, which are vehicles for transporting luggage (cargo), are equipped with a lifting device for loading and unloading luggage in order to improve the workability of loading and unloading operations. This lifting device for loading and unloading luggage includes a plate-shaped member and a lifting mechanism that raises and lowers the plate-shaped member. As the plate-shaped member rises and lowers, the upper surface of the plate-shaped member (the surface on which luggage is placed, the cargo receiving surface) rises and lowers between a position close to the ground and a position at about the same height as the floor of the loading platform. That is, the worker places the load on the plate-shaped member with the upper surface of the plate-shaped member positioned downward, then moves the plate-shaped member upward, and transports the load from the plate-shaped member onto the loading platform. This makes the loading and unloading process easier than if the worker had to manually lift the load from the ground onto the loading platform.

[0003] However, when performing cargo handling work with a lifting device for loading and unloading cargo, it is conceivable that the cargo or the worker may accidentally fall off the plate-shaped member during the work. As a technology for preventing such problems from occurring, Patent Document 1 discloses a lifting device (tailgate) in which a safety fence is provided on a plate-shaped member (floor plate).

[0004] The lifting device of Patent Document 1 changes the position of the safety fence between a folded state and an upright state. That is, when the safety fence is folded, it is laid on the upper surface (the surface that serves as the load-receiving surface) of the plate-shaped member that is horizontal to the floor. That is, the safety fence is placed on the upper surface of the plate-shaped member that is horizontal to the floor so that the support parts of the safety fence extend in a direction parallel to the upper surface of the plate-shaped member.

[0005] When the safety fence is changed from the folded state to the standing state, the safety fence is rotated to the standing state. More specifically, the safety fence in Patent Document 1 has a base end portion rotatably attached to the top surface of a plate-shaped member at a position near the outer end in the vehicle width direction. This allows the safety fence to rotate around an axis extending in the front-to-rear direction, centered on the base end portion. In addition, when folded, the tip end portion of the safety fence is located close to the top surface of the plate-shaped member and away from the outer end in the vehicle width direction toward the center. Therefore, when the folded safety fence is rotated and the tip portion of the safety fence is moved upward and outward in the vehicle width direction, the safety fence becomes erect. At this time, the safety fence extends upward from the upper surface of the plate-shaped member, extending upward from a position slightly inside the edge in the vehicle width direction. At this time, the tip portion of the safety fence forms the upper end portion in the erected state. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent Publication No. 2021-115905 Summary of the Invention [Problem to be solved by the invention]

[0007] In the above-described conventional lifting device, when the safety fence is folded, it lies flat on the plate-shaped member. Therefore, when a worker tries to erect the safety fence on the plate-shaped member, other safety fences can sometimes cause problems, such as the worker being unable to find a foothold. On the other hand, in the conventional lifting device, the leading edge of the safety fence, which is moved when erecting the safety fence, is positioned away from the upper edge of the plate-shaped member, making it extremely difficult for the worker to descend from the plate-shaped member to erect the safety fence. In other words, the conventional lifting device leaves room for improvement in terms of improving operational convenience.

[0008] Furthermore, the conventional lifting device described above does not allow luggage to be placed on the portion of the upper surface of the plate-shaped member where the safety fence is located (the portion near the edge in the vehicle width direction). In other words, the conventional lifting device has a problem in that the proportion of the portion of the upper surface of the plate-shaped member where luggage can be placed is small, and the amount of luggage that can be placed at one time is limited.

[0009] In other words, although the conventional lifting device has a high level of safety due to the presence of a safety fence, there is room for improvement in terms of enabling more efficient operation.In other words, the conventional lifting device has room for improvement from the viewpoint of achieving both improved safety and improved convenience during operation.

[0010] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a loading platform lifting device that is safer and more convenient. [Means for solving the problem]

[0011] One aspect of the present invention for solving the above-mentioned problems is a loading platform lifting device that is mounted to form part of a vehicle, and includes a loading platform, a lifting mechanism for raising and lowering the loading platform, and a fence member attached to the loading platform, wherein the loading platform has a loading surface portion that forms the upper surface when a package can be placed on it, a back forming portion that forms the surface that faces the ground in the same state, and a side forming portion that forms the side surface in the same state, and the fence member changes its position between an in-use position and an out-of-use position, and when changing its position from the out-of-use position to the in-use position, at least a portion of the fence member moves within a range that includes a position that is vertically further away from the back forming portion to a position that is laterally further outward from the side forming portion, and is positioned in a range from the side of the side forming portion to above the loading platform.

[0012] According to this aspect, the fence member can be easily brought into the in-use position even when the worker has stepped down from the receiving platform, and the configuration allows for a large amount of cargo to be placed on the receiving platform.

[0013] In a preferred aspect, the fence member can be changed from the non-use position to the use position with at least a portion of the back forming portion facing the ground, and during this position change, a portion of the fence member moves from a position that is lower and further away from the portion of the back forming portion facing the ground to a position that is laterally and outward from the side forming portion, and then to a position that is higher than the load receiving surface portion.

[0014] According to this aspect, when a worker changes the position of the fence member from the side of the loading platform to the position for use, the fence member changes position at a position that is easily reachable by the worker, making the position change operation easier.

[0015] In a preferred aspect, the fence member has an expandable portion that is expandable in the in-use position, and the length can be adjusted by expanding and contracting the expandable portion.

[0016] According to this aspect, the length of the fence member can be adjusted according to the shape and amount of cargo to be loaded and unloaded, improving safety when length is required, and allowing the fence member to be used in a state where it does not interfere with work when less length is required.Furthermore, the fence member can be made compact when not in use, and a configuration can be achieved in which a large space is not necessarily required for the placement of the fence member when not in use.

[0017] In a preferred aspect, when the fence member is in the unused position, the fence member is entirely located inside the side surface forming portion.

[0018] According to this aspect, by placing the fence member in the unused position, the fence member is positioned so that it does not (is unlikely to) interfere with other members. Therefore, when the fence member in the unused position is moved together with the loading platform, and the fence member and the loading platform are placed (stored) in a recessed space around the vehicle body, such movement can be facilitated. In addition, when a vehicle equipped with a loading platform lifting device travels with the fence member in the unused position, problems caused by the fence member colliding with other vehicles traveling on the same road can be more reliably prevented.

[0019] In a preferred aspect, when the fence member is changed from the non-use position to the use position, it rotates around a position that is closer to the ground than the back forming portion as a rotation center, and has a use position control means that controls the change in position of the fence member when it is in the use position.

[0020] According to this aspect, the pivot shaft of the fence member and the member supporting the pivot shaft can be positioned in a recessed position so as not to interfere with loading and unloading operations, making it easier to carry out loading and unloading operations and improving operational convenience. In addition, this aspect can more reliably prevent unintended position changes of the fence member.

[0021] In a more preferred aspect, the usage posture regulating means has a first regulating means forming portion provided on one of the load receiving platform and the fence member, a second regulating means forming portion provided on the other, and an insertable / removable member, and a hole portion formed in the first regulating means forming portion and a hole portion formed in the second regulating means forming portion are overlapped to form a communicating hole, and by inserting the insertable / removable member into the communicating hole, changes in the posture of the fence member are regulated.

[0022] According to this aspect, when changing the position of the fence member, the fence member is rotated to a position where the hole portions of the first restriction means forming portion and the second restriction means forming portion provided on one side of the fence member and the other side of the load receiving platform overlap. In other words, the operator only needs to rotate the fence member to a position where the hole portions overlap, and the use position restriction means also functions as positioning means (alignment means) when rotating the fence member, making the position change operation of the fence member easier. [Effects of the Invention]

[0023] According to the present invention, a highly safe and convenient loading platform lifting device can be provided. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a side view showing a vehicle equipped with a platform lifting device according to an embodiment of the present invention. [Figure 2] 2 is an enlarged side view showing the periphery of the loading platform lifting device of FIG. 1. FIG. [Figure 3] FIG. 2 is a perspective view showing the load receiving platform and the rotating fence member of FIG. 1. [Figure 4] 4 is a perspective view showing the receiving platform of FIG. 3, in which a portion located below the receiving platform main body is indicated by a dotted line. [Figure 5] 4A and 4B are perspective views showing a part of the rotating fence member and the fence mounting part of FIG. 3, where (a) and (b) show the state as seen from different directions. [Figure 6] 6A and 6B are side views of the rotating fence member of FIG. 5, in which (a) shows a state in which the length of the support pole is extended, and (b) shows a state in which the length of the support pole is shortened. [Figure 7]An explanatory diagram showing the loading platform lifting device of Figure 1, where (a) shows the loading platform section in a lower position during operation, and (b) shows the loading platform section in an upper position during operation. [Figure 8] 2A to 2C are explanatory views showing how the loading platform lifting device of FIG. 1 is shifted from an operating state to a storage state, with the shift occurring in the order of (a) to (c). [Figure 9] This is a diagram showing how the rotating fence member in Figure 8(c) changes position from a position when in use to a position when not in use, and is an explanatory diagram that schematically shows the rotating fence member and its surroundings while omitting the second unit component, and the position is changed in the order of (a) and (b). [Figure 10] This is a diagram following Figure 9 showing how the rotating fence member is changed to its non-use position. It is an explanatory diagram that shows the rotating fence member and its surroundings in a schematic manner, omitting the second unit component, and the position is changed in the order of (a) and (b). [Figure 11] 10 is a rear view schematically showing the state in which the load receiving platform is folded and the rotating fence member is in the unused position. FIG. [Figure 12] Following Figure 8, this is an explanatory diagram showing how the loading platform lifting device transitions to a stored state after the rotating fence member has been changed to its unused position, with the transition occurring in the order of (a) and (b). [Figure 13] 1. This is an explanatory diagram showing a vehicle equipped with a loading platform lifting device according to an embodiment different from that shown in FIG. 1, where (a) shows the loading platform lifting device in a traveling state, and (b) shows the loading platform lifting device in a working state with the rotating fence member in a use position. [Figure 14] An explanatory diagram showing the loading platform lifting device in the working state and the rotating fence member in the use position in the vehicle shown in Figure 13, where (a) shows the loading platform section in an upper position, and (b) shows the loading platform section in a lower position. [Figure 15] 1 and 13, (a) shows the loading platform lifting device in a traveling state, and (b) shows the loading platform lifting device in a working state with the rotating fence member in a use position. [Figure 16] An explanatory diagram showing the loading platform lifting device in the working state and the rotating fence member in the use position in the vehicle shown in Figure 15, where (a) shows the loading platform section in an upper position, and (b) shows the loading platform section in a lower position. [Figure 17] 1, 13, and 15, (a) shows the loading platform lifting device in a traveling state, and (b) shows the loading platform lifting device in a working state with the rotating fence member in a use position. [Figure 18] An explanatory diagram showing the loading platform lifting device in the working state and the rotating fence member in the use position in the vehicle shown in Figure 17, where (a) shows the loading platform section in an upper position, and (b) shows the loading platform section in a lower position. DETAILED DESCRIPTION OF THE INVENTION

[0025] The loading platform lifting device 1 according to the embodiment of the present invention will be described in detail below. In the following description, the relationships of front, rear, left, right, and up and down are the same as those of the vehicle 3, with the driver's cab 2a side being the front side, the opposite side, the loading platform 4 side being the rear side, and the vehicle width direction being the left-right direction.

[0026] As shown in FIG. 1, the loading platform lifting device 1 of this embodiment is a device that is attached to a vehicle body 2 when in use, and constitutes a part of a vehicle 3 to which the loading platform lifting device 1 is attached.

[0027] The vehicle body 2 has a driver's cab 2a and a vehicle body frame 2b extending rearward from the lower part of the driver's cab 2a. The vehicle 3 of this embodiment is a vehicle (cargo handling vehicle) for transporting luggage (freight) and has a body frame 2b equipped with a loading platform 4. Specifically, the vehicle 3 has the loading platform 4 attached to the upper side of the body frame 2b behind the driver's cab 2a.

[0028] The receiving platform lifting device 1 has a platform driving mechanism section 10 (lifting mechanism), a receiving platform section 11 (receiving platform), and a rotating fence member 12 (fence member).

[0029] As shown in Figure 2, the table driving mechanism 10 has a rail portion 15, a slide portion 16 that slides horizontally (front and back) along the rail portion 15, a cylinder member 17 that slides the slide portion 16, and a guide roller 18.

[0030] In this embodiment, the rail portion 15 is composed of two rail members 15a (one of the rail members 15a is not shown) that are spaced apart in the left-right direction (depth direction in FIG. 2). Both of the two rail members 15a are attached to the body frame 2b via mounting brackets and extend in the front-rear direction so as to be parallel to each other.

[0031] The slide portion 16 has an arm base portion 21 and an arm portion 22 (lifting mechanism) that are slidably attached to the two rail members 15a. The table drive mechanism 10 of this embodiment has two arm sections 22 (one of the arm sections 22 is not shown in FIG. 2, see FIG. 4, etc.). The two arm sections 22 are spaced apart in the left-right direction (depth direction in FIG. 2), and both extend in a cantilevered manner from the arm base section 21. That is, one arm section 22 extends from a position on one end side of the arm base section 21 in the left-right direction, and the other arm section 22 extends from a position on the other end side of the arm base section 21 in the left-right direction.

[0032] The load receiving platform 11 is attached to the tip end portions of the two arm sections 22. As with known devices, each of the two arm sections 22 has a lift cylinder that functions as a lifting drive device, and the tip end rises and falls as the lift cylinder extends and retracts. When the tip ends of the two arm sections 22 rise and fall together, the load receiving platform 11 rises and falls (see Figure 7).

[0033] The guide roller 18 is a roller rotatably provided at the rear end portion of a cylinder support member that supports the cylinder member 17 .

[0034] As shown in Figures 3 and 4, the receiving platform portion 11 has a plate-shaped (plate-like) receiving platform main body portion 26 divided into multiple parts, a reinforcing connecting portion 27 (see Figure 4), a platform side regulating portion 28 (first regulating means forming portion, usage posture regulating means), and a fence mounting portion 29.

[0035] 3, the receiving platform main body 26 is a plate-like member divided into two plate-like members, a first platform component 26a and a second platform component 26b. That is, the receiving platform main body 26 has the first platform component 26a and the second platform component 26b, both of which are plate-like.

[0036] The second unit component 26b is rotatably hinged to the first unit component 26a, so that the receiving platform 11 (the receiving platform main body 26) can be switched between a folded state (see FIG. 12) and an unfolded state (see FIG. 7) (details will be described later). Furthermore, as described above, the loading platform lifting device 1 can raise and lower the loading platform section 11 in the unfolded state between a lower position (see Figure 7(a)) and an upper position (see Figure 7(b)) by raising and lowering the tip end of the arm section 22 (details will be described later). In the following description, unless otherwise specified, the description will be made based on the state in which the load receiving platform 11 is in the unfolded state and disposed at the upper position.

[0037] As shown in Fig. 4, the receiving platform main body 26 has a receiving surface portion 33 that forms a receiving surface on which luggage is placed. The receiving surface portion 33 is the upper surface (one main surface) of the receiving platform main body 26 in the unfolded state, and this upper surface is a surface formed by lining up one main surface of the first platform component 26a and one main surface of the second platform component 26b. The receiving platform main body 26 also has a back surface forming portion 34 that forms the back surface. The back surface forming portion 34 is the underside (other-side main surface) of the receiving platform main body 26 in the unfolded state, and this underside is the surface where the other-side main surface of the first platform component 26a and the other-side main surface of the second platform component 26b are formed side by side. Furthermore, the receiving platform main body 26 has a side surface forming portion 35 that forms a side surface. The side surface forming portion 35 is located between the receiving surface portion 33 and the back surface forming portion 34, and forms an end face located at one end of the left-right direction and an end face located at the other end of the left-right direction. In other words, the receiving platform main body 26 has two side surface forming portions 35. Furthermore, the side surface (the end face located at the end of the left-right direction) referred to here is the surface formed by the side surface of the first platform component 26a and the side surface of the second platform component 26b lined up side by side.

[0038] As shown in Figure 4, the reinforcing connecting portions 27 function as reinforcing members (reinforcing strips) that improve the strength of the loading platform main body 26, and also function as connecting portions to which the tip portions of the arm portions 22 are attached. In this embodiment, a total of two reinforcing connecting portions 27 are provided, one at a time and spaced apart in the left-right direction, with the tip portion of one arm portion 22 attached to one reinforcing connecting portion 27 and the tip portion of the other arm portion 22 attached to the other reinforcing connecting portion 27. The two reinforcing connecting portions 27 have the same structure, so only one will be described in detail and a detailed description of the other will be omitted.

[0039] The reinforcing connecting portion 27 has a first reinforcing body component 27a attached to the other main surface of the first base component 26a, and a second reinforcing body component 27b attached to the other main surface of the second base component 26b.

[0040] The first reinforcing body component 27a has two flat plate-like portions (not shown) that are in surface contact with the other main surface of the first base component 26a, and two standing plate-like portions 40, 41 that hang down from the two flat plate-like portions. That is, the standing plate-like portions 40, 41 are standing plate-like portions that have a height in a direction perpendicular to the main surface of the first base component 26a and a thickness in the left-right direction. The two upright plate-like portions 40, 41 are arranged with a gap between them in the left-right direction. The tip end portion of the arm portion 22 is attached to the two upright plate-like portions 40, 41 with the tip end portion of the arm portion 22 inserted into the gap formed between the two upright plate-like portions 40, 41.

[0041] The second reinforcement component 27b has two flat plate-shaped portions (not shown) that are in surface contact with the other main surface of the second base component 26b, two upright plate-shaped portions 44, 45 that hang down from the two flat plate-shaped portions, and a connecting flat plate portion 46. The upright plate-like portions 44, 45 of the second reinforcing body component 27b are also upright plate-like portions that have a height in a direction perpendicular to the main surface of the second base component 26b and a thickness in the left-right direction. Note that the height of some of the upright plate-like portions 44, 45 in this embodiment decreases toward the tip end of the second base component 26b (toward the lower right in FIG. 4). The connecting flat plate portion 46 is a flat plate portion that connects a part of the lower end portion of one upright plate portion 44 with a part of the lower end portion of the other 45, and is inclined so that its height decreases as it approaches the tip side of the second base component portion 26b.

[0042] One standing plate-like portion 44 is a portion that is aligned with one standing plate-like portion 40 of the first reinforcing body constituent portion 27a in a predetermined direction (the alignment direction of the first reinforcing body constituent portion 27a and the second reinforcing body constituent portion 27b). The other standing plate-like portion 45 is also a portion that is aligned with the other standing plate-like portion 41 of the first reinforcing body constituent portion 27a in a predetermined direction.

[0043] The platform-side regulating portion 28 is a protruding portion that protrudes outward (above from the upper surface, the package receiving surface portion 33) from one main surface of the package receiving platform main body portion 26, and the platform-side regulating portion 28 in this embodiment protrudes outward from a position adjacent to the left-right end of one main surface of the first platform component portion 26a. The package receiving platform portion 11 in this embodiment has two platform-side regulating portions 28, one at each position spaced apart in the left-right direction. The base-side restricting portion 28 has a base-side insertion hole 28a through which a portion of the insertion member 30 (see FIG. 3) can be inserted almost exactly. In detail, the base-side insertion hole 28a is a through-hole that penetrates the base-side restricting portion 28, and extends in a direction that intersects with the protruding direction of the base-side restricting portion 28 (in this embodiment, the front-rear direction, the direction in which the first base component 26a and the second base component 26b are arranged in the unfolded state). The inserting / removing member 30 is a rod-like member made of metal and having a roughly rectangular parallelepiped shape.

[0044] The fence mounting portion 29 is a metal fitting for mounting the rotating fence member 12, and has a first fence mounting portion 29a and a second fence mounting portion 29b. The loading platform 11 of this embodiment has multiple (two) fence mounting portions 29, one at each side, spaced apart in the left-right direction (one of the fence mounting portions 29 is not shown in FIG. 4). Note that the two fence mounting portions 29 have the same structure, so only one will be described in detail, and a detailed description of the other will be omitted.

[0045] The first fence mounting portion 29a has two pairs of upright plate-like portions. Specifically, it has two flat plate-like portions (not shown) that are in surface contact with the other main surface of the first platform component 26a (load-receiving platform main body 26) and two upright plate-like portions that hang down from the two flat plate-like portions, respectively. The two upright plate-like portions are spaced apart in the front-to-rear direction, and each has a thickness in the front-to-rear direction. That is, the rear side surface of one of the two upright plate-like portions faces the front side surface of the other upright plate-like portion, spaced apart in the front-to-rear direction. Each of the two upright plate-like portions has a shaft hole that penetrates the upright plate-like portion in the thickness direction and is a hole through which a rod-shaped shaft member can be inserted. The shaft hole portions formed in the two upright plate-like portions are located at positions spaced apart in the front-to-rear direction.

[0046] The second fence mounting portion 29b has the same structure as the first fence mounting portion 29a, and a detailed description thereof will be omitted. The second fence mounting portion 29b is also a metal fitting attached to the first base component 26a, and is disposed at a position separated from the first fence mounting portion 29a in the front-to-rear direction (a position separated from the rear).

[0047] As shown in Figure 3, the loading platform lifting device 1 of this embodiment has two rotating fence members 12 attached integrally to one side and the other side in the left-right direction. Since the two rotating fence members 12 have the same structure, only one will be described in detail, and a detailed description of the other will be omitted.

[0048] As shown in FIG. 5, the rotating fence member 12 has two support posts 50 (extendable portions), a cross-bar forming portion 51, and a connecting bar portion 52.

[0049] The support portion 50 has a support base side portion 56 and a support tip side portion 57 in the shape of a square tube. The base end side portion 56 of the support pillar is a portion that is bent and extends in an approximately L-shape, and has a casing tube portion 56a extending in a predetermined direction (vertical direction in Figure 5) and a connector forming portion 56b extending in a direction intersecting the casing tube portion 56a (perpendicular to the direction in this embodiment).

[0050] The housing tube portion 56a is a rectangular tube-shaped portion that can house a part of the end side portion 57 of one of the support columns. Here, the storage tube portion 56a and the pole tip side portion 57 are rectangular tubular members of different thicknesses, and are connected to each other via a telescopic structure so that they can expand and contract. That is, as shown in Fig. 6, by changing the amount of the portion of the pole tip side portion 57 that is arranged inside the storage tube portion 56a (the overlapping portion in the direction of expansion of the cross section), the pole portion 50 expands and contracts, and the length of the pole portion 50 in the longitudinal direction (the up-down direction in Fig. 6) changes. More specifically, by placing a larger portion of the pole tip side portion 57 in a state where it is housed inside the storage tube portion 56a (see Fig. 6(b)), the length of the rotating fence member 12 (pole portion 50) in the longitudinal direction becomes shorter.

[0051] The connector forming portion 56b is a portion that extends so as to protrude from the lower end of one side surface of the accommodating tube portion 56a, and in this embodiment, it protrudes inward in the same direction from the inner side surface in the left-right direction (from the rear side surface to the rear right side in Figure 5(a)). The tip end portion of the connector forming portion 56b in the protruding direction is rotatably attached to the fence mounting portion 29. More specifically, of the two support portions 50, a portion of the protruding end of the connector forming portion 56b of one of the support portions 50 is disposed between the two upright plate-shaped members of the first fence mounting portion 29a, and is rotatably attached to the first fence mounting portion 29a. That is, a rotation axis forming member 58 penetrates a portion of the protruding end of the connector forming portion 56b and the two upright plate-shaped members, and the connector forming portion 56b is rotatable about the rotation axis forming member 58. The rotation axis forming member 58 is a rod-shaped shaft member that extends in the front-to-rear direction (in FIG. 5(a) , the upper left side is the front, and in a diagonal direction). As a result of the above, the support column 50 is rotatable about the axis of the rotary shaft forming member 58 (a virtual line, not shown, that passes through the center of the rotary shaft forming member 58 and extends in the front-rear direction).

[0052] Furthermore, of the two support poles 50, the connector forming portion 56b of the other support pole 50 is rotatably attached to the second fence mounting portion 29b. The attachment structure of this connector forming portion 56b and the second fence mounting portion 29b is the same as the attachment structure of the connector forming portion 56b and the first fence mounting portion 29a described above, so a detailed description thereof will be omitted.

[0053] The support post 50 has a fence-side restricting portion 60 (second restricting means forming portion, usage posture restricting means). The fence side regulating portion 60 is a portion that protrudes from one side of the storage tube portion 56a, and in this embodiment, it protrudes inward in the same direction from the inner side surface in the left-right direction (from the rear side surface to the rear right side in Figure 5(a)). The fence-side restricting portion 60 has a fence-side insertion hole 60a through which a portion of the insertable member 30 (see FIG. 3) can be inserted. In detail, the fence-side insertion hole 60a is a through-hole that penetrates the fence-side restricting portion 60 and extends in a direction that intersects with the protruding direction of the fence-side restricting portion 60 (in this embodiment, this is the front-to-rear direction; in FIG. 5(b) , it is a diagonal direction from one of the left front side and the right rear side to the other).

[0054] The cross-bar forming portion 51 is formed integrally with the pillar tip side portion 57 and is a portion that extends horizontally in a direction that intersects with the pillar tip side portion 57, and in this embodiment, extends in the front-to-back direction in a direction perpendicular to the pillar tip side portion 57. The rotating fence member 12 of this embodiment has three cross-bar forming portions 51, one of which extends between two support post tip side portions 57 so as to connect them, and another of which extends laterally in a cantilevered manner from the side of the support post tip side portion 57. Furthermore, the third of the cross-bar forming portions 51 has the upper end of the support post tip side portion 57 connected to part of its underside, and extends above the support post tip side portion 57. In other words, each cross-bar forming portion 51 is formed integrally with one or more support post tip side portions 57.

[0055] The connecting bar portion 52 is a portion that connects one horizontal bar forming portion 51 to another horizontal bar forming portion 51, or connects one horizontal bar forming portion 51 to a support tip side portion 57, and at least a portion of the connecting bar portion 52 is formed integrally with the horizontal bar forming portion 51. The connecting bar portion 52 is also a portion that extends in a direction that includes a component in the extension direction of the support tip side portion 57 (the vertical direction in FIG. 5). The rotating fence member 12 of this embodiment has two connecting bar portions 52, one of which extends between the two cross-bar forming portions 51 to connect them, and which extends parallel to the support post tip side portion 57 with a gap in the fore-and-aft direction. The other extends from the upper end of one of the pillar tip side portions 57 to the rear end (one of the longitudinal end portions) of one of the cross-bar forming portions 51, connecting them, and extends diagonally so that its height increases as it moves forward.

[0056] In the rotating fence member 12 of this embodiment, the fence tip side portion (upper fence portion) having a lattice-like portion is formed by the support post tip side portion 57, the cross bar forming portion 51, and the connecting bar portion 52, and the fence base side portion (lower fence portion) is formed by the two support post base side portions 56. Then, as described above, when the two support posts 50 are extended or retracted (see Figure 6), the fence tip side portion slides relative to the fence base side portion. In other words, it can be said that the rotating fence member 12 has the fence tip side portion connected to the fence base side portion so that it can move relative to it.

[0057] As described above, the receiving platform portion 11 (the receiving platform main body portion 26) of this embodiment can be switched between a folded state (see FIG. 12, etc.) and an unfolded state (see FIG. 7). In the folded state, as shown in FIG. 12 and other figures, the first unit component 26a and the second unit component 26b are at least partially overlapped with each other in the vertical direction. In the unfolded state, the second unit component 26b rotates and unfolds from the folded state, and the first unit component 26a and the second unit component 26b are lined up in a row in a predetermined direction. Note that the predetermined direction here is a diagonal direction toward the lower rear (lower right in FIG. 7(a)) in the state of FIG. 7(a), and is the front-to-rear direction (left-to-right direction in FIG. 7(b)) in the state of FIG.

[0058] Furthermore, the rotating fence member 12 of this embodiment can change its position between an in-use position (see FIG. 7, etc.) in which it functions as a fence, and an unused position (see FIG. 11, etc.) in which it is not used as a fence. The unused position is also the stored position when the fence is stored when not in use (described in detail later).

[0059] Furthermore, the loading platform lifting device 1 of this embodiment can be set to a storage state (see FIG. 12(b)) in which the loading platform section 11 is in a folded state and the rotating fence member 12 is in a non-use position and stored below the rear of the loading platform 4. Furthermore, the loading platform lifting device 1 can be set to a working state (see FIG. 7) in which the loading platform section 11 is in an unfolded state and located behind the loading platform 4. In other words, the loading platform lifting device 1 is a so-called under-floor storage type lifting device that can be switched between a stored state and a working state, and at least a portion of it can be stored below the floor of the loading platform 4 (the floor inside the cargo box where cargo is loaded and unloaded). The stored state is also the state of the loading platform lifting device 1 when the vehicle 3 is traveling (driving state).

[0060] When the load-receiving platform lifting device 1 is set to the working state, the load-receiving platform section 11 in the unfolded state can be raised and lowered between the lower position and the upper position, as shown in FIG. When the load receiving platform 11 is disposed in the lower position, at least a part of the lower portion of the load receiving platform 11 comes into contact with the ground. Specifically, "at least a part of the lower portion of the load receiving platform 11" refers to the reinforcing connecting part 27 attached to the lower surface (back surface forming part 34) of the load receiving platform main body 26. Furthermore, the "ground" referred to here includes the general surface on which the vehicle 3 travels (the travel surface that the wheels of the vehicle 3 come into contact), such as an indoor floor. In contrast, when the cargo receiving platform 11 is positioned in an upper position, the upper surface of the cargo receiving platform 11 (the upper surface of the cargo receiving platform main body 26) is positioned at the same or approximately the same height as the floor surface of the cargo platform 4 (the floor surface inside the cargo box where cargo is loaded and unloaded).

[0061] Next, the procedure for switching the loading platform lifting device 1 of this embodiment from the working state to the stored state will be described. Note that the loading platform lifting device 1 of this embodiment is assumed to use the rotating fence member 12 in the working position when in the working state, and the rotating fence member 12 is in the non-use position when in the stored state. Therefore, the procedure for switching from the working state in which the rotating fence member 12 is in the working position to the stored state will be described below.

[0062] When the loading platform lifting device 1 transitions from the working state to the storage state, as shown in Figure 8, the loading platform section 11 is deployed and positioned at a lower position (see Figure 8(a)), and the second platform component 26b is rotated (see Figure 8(b)). Then, the tip end (free end) of the second platform component 26b is brought into contact with the guide roller 18 (see FIG. 8(b)), and the second platform component 26b is placed against the guide roller 18. This causes the receiving platform 11 (the receiving platform main body 26) to transition from the unfolded state to the folded state.

[0063] In this state, the receiving platform lifting device 1 raises the tip ends of the two arms 22 (one of which is not shown in FIG. 8) as shown in FIG. 18(c), causing the receiving platform 11 to enter a state in which the second platform component 26b is folded up by its own weight. Note that the "folded state" means that when the folded state is achieved, one main surface of the first component 26a and one main surface of the second component 26b, which are arranged in opposing positions, become closer together, and the gap between them becomes smaller (or disappears).

[0064] Next, with the load receiving platform 11 disposed at a position above the ground, the rotating fence member 12 is changed from the in-use position to the in-use position.

[0065] 6(a) and 6(b), the worker shortens the two support posts 50 to shorten the length of the rotating fence member 12 in the longitudinal direction (the vertical direction in the posture during use). Then, as shown in FIG. 3, the worker removes the insertion / removal member 30 from the table-side restricting part 28 and the fence-side restricting part 60, which are arranged side by side in the longitudinal direction (detailed illustration omitted). More specifically, when the rotating fence member 12 is in its in-use position, the platform-side restricting portion 28 and the fence-side restricting portion 60 are arranged side by side in the front-to-rear direction. In this embodiment, the platform-side restricting portion 28 and the fence-side restricting portion 60 are arranged side by side so that their rear surfaces are in surface contact and in close contact with each other. As a result, the platform-side insertion hole 28a (see FIG. 4) of the platform-side restricting portion 28 and the fence-side insertion hole 60a of the fence-side restricting portion 60 overlap in the front-to-rear direction to form a communication hole. The loading platform lifting device 1 of this embodiment prevents unintentional rotation (change of position) of the rotating fence member 12 by inserting the insertable member 30 into this communication hole. Therefore, by removing the insertable member 30 from the communication hole, the rotating fence member 12 becomes capable of changing its position (being rotatable).

[0066] Furthermore, as shown in Figures 9 and 10, the rotating fence member 12 is rotated around an axis extending in the front-to-rear direction. The shortening of the length of the rotating fence member 12 (see Figure 6) and the rotation may occur before or after each other, or may occur in parallel. In other words, the rotating fence member 12 is rotated around the rotation axis forming member 58, which is located below the underside of the first platform component 26a (load receiving platform main body 26). As mentioned above, the underside of the first platform component 26a is part of the back surface forming portion 34. At this time, as shown in Figure 9, the portion that is located above the first base component 26a in the in-use position moves along an arc-shaped trajectory, passing the outer lateral side (outer left side in Figure 9) of the side surface of the first base component 26a (part of the side surface forming portion 35) and down to the lower side of the underside of the first base component 26a. The portion that is located on the outer lateral side of the side surface of the first base component 26a in the in-use position also moves along an arc-shaped trajectory to the lower side of the underside of the first base component 26a. In other words, the rotating fence member 12 changes position so as to fall down to the outer lateral side (outside in the left-right direction), and transitions from a position in which the support portion 50 extends up and down to a position in which the support portion 50 extends left and right (horizontally).

[0067] 10(a), when the rotating fence member 12 continues to rotate in the same direction (counterclockwise when viewed from behind in FIGS. 9 and 10), it is positioned so that the entire rotating fence member 12 overlaps the first platform component 26a (load-receiving platform main body 26) in the vertical direction. In other words, the entire rotating fence member 12 is positioned inward in the same direction from the left-right ends of the first platform component 26a, and is positioned below the underside of the first platform component 26a. At this time, the rotating fence member 12 is in a position in which the support posts 50 extend in the vertical direction, which is the opposite position to the position when in use. 10(b), if it continues to rotate in the same direction, a larger portion (the entire portion in this embodiment) of the connector forming portion 56b (see FIG. 10(a)) will be positioned so that it overlaps the upright portion of the fence mounting portion 29 in the front-to-rear direction (front-to-rear direction in FIG. 10). This causes the rotating fence member 12 to transition to its unused position.

[0068] In the non-use position of the rotating fence member 12 of this embodiment, the support posts 50 extend in the left-right direction. More specifically, the support post base end side portions 56 are positioned on the outside in that direction, and the fence tip side portions (support post tip side portions 57, horizontal bar forming portions 51, connecting bar portions 52) that form the upper side in the use position are positioned on the inside in that direction. Furthermore, in the unused position, the rotating fence member 12 is positioned so that the entirety of it overlaps with the first platform component 26a (load receiving platform main body 26) in the vertical direction, and is positioned further inward in the left-right direction than the ends of the first platform component 26a. In other words, by placing the rotating fence member 12 in the unused position, the load receiving platform lifting device 1 is configured so that the rotating fence member 12 and its attachment members are not positioned further outward in the left-right direction than the side surfaces of the load receiving platform main body 26.

[0069] Here, as shown in Figure 11, in the loading platform lifting device 1 of this embodiment, the area outside the other main surface of the first platform component 26a (below the lower surface in Figure 11) and outside one first reinforcing body component 27a (standing plate-shaped portion 40) is defined as a first region 65. Also, in the loading platform lifting device 1, the area outside the other main surface of the first platform component 26a and outside to the lateral side of the other first reinforcing body component 27a (standing plate-shaped portion 41) is defined as a second region 66. In other words, the first region 65 and the second region 66 are regions that include portions adjacent to the lower side of the lower surface of the first platform component 26a.

[0070] In the loading platform lifting device 1 of this embodiment, the first area 65 and the second area 66 are areas in which the rotating fence member 12 in the unused position is positioned. That is, in the unused position, the rotating fence member 12 is positioned entirely above the lower end of the first reinforcing body component 27a. In other words, by placing the rotating fence member 12 in the unused position, the loading platform lifting device 1 is configured so that the rotating fence member 12 and its attachment members are not positioned below the lower end of the loading platform section 11. In the loading platform lifting device 1 of this embodiment, by arranging the rotating fence member 12 in this non-use position, the rotating fence member 12 does not (is unlikely to) interfere with the movement of the loading platform section 11 or the travel of the vehicle 3.

[0071] Explaining in more detail, when the two rotating fence members 12 of the receiving platform lifting device 1 are in the in-use state as shown in Figure 3, most of the rotating fence members 12 are positioned outside the left-right direction of the first platform component 26a. Specifically, the rotating fence member 12, except for the fence-side restricting member 60 and the two connector forming members 56b, is positioned outside the left-right direction of the end (end face) of the first platform component 26a. Therefore, the left-right direction L1 length of the portion formed by the receiving platform 11 (load receiving platform main body 26) and the rotating fence members 12 is the length from the outside left-right end of one rotating fence member 12 to the outside left-right end of the other rotating fence member 12.

[0072] In addition, with this configuration in which the majority of the rotating fence member 12 is located laterally outside the first platform component 26a, it is also possible to place cargo on the portion of the upper surface of the first platform component 26a that is close to the rotating fence member 12. For example, the cargo receiving surface 33 of this embodiment is also capable of placing cargo near the edge of the rotating fence member 12 that is adjacent to one of the connector forming portions 56b. In other words, the cargo receiving platform 11 of this embodiment is capable of placing more cargo on the cargo receiving surface 33 than a configuration in which a fence extends from the upper surface of the cargo receiving platform main body 26. Furthermore, in the receiving platform lifting device 1 of this embodiment, compared to a configuration in which a fence extends from the top surface of the receiving platform main body 26, the rotating fence member 12 is arranged in a position that does not (is unlikely to) get in the way of an operator walking or working on the receiving platform main body 26. In other words, the receiving platform lifting device 1 of this embodiment has a wider area on the receiving platform main body 26 where an operator can walk (work), and people or luggage are less likely to bump into the rotating fence member 12 when working, making it highly convenient to use.

[0073] On the other hand, when the two rotating fence members 12 are in the unused position as described above, the length L2 of the portion formed by the receiving platform 11 (load receiving platform main body 26) and the rotating fence members 12 is the same as the left-right length of the loading platform main body 26, as shown in Figure 11. In other words, the left-right length L2 of the portion formed by the receiving platform 11 (first platform component 26a) and the rotating fence members 12 is shorter than the left-right length L1 (see Figure 3) of the same portion when the rotating fence members 12 are in the used position. In addition, this embodiment is configured so that the rotating fence members 12 in the unused position are positioned above the lower end of the loading platform 11. This configuration can prevent (suppress) problems caused by the rotating fence member 12 interfering with other members when sliding the load receiving platform 11 (described in detail later), etc. In other words, when sliding the load receiving platform 11, it can prevent (suppress) problems such as parts of the rotating fence member 12 or mounting hardware that protrude to the side or below the load receiving platform 11 colliding with other members, damaging the members, or hindering smooth operation. It can also prevent problems such as the rotating fence member 12, etc. that protrudes to the side of the load receiving platform 11 colliding with other vehicles traveling on the same road when the vehicle 3 is traveling.

[0074] The loading platform lifting / lowering device 1 of this embodiment has an unused position restricting means (not shown) that restricts unintentional position changes of the rotating fence member 12 that is in the unused position. The unused position restricting means of this embodiment is a metal fitting that is integrally formed on the other main surface (the lower surface in FIG. 11) of the first base component 26a and is capable of holding at least a portion (in this embodiment, a portion of the above-mentioned fence tip side portion) of the rotating fence member 12. More specifically, the unused position restricting means is a metal fitting that has a roughly U-shaped cross section and has two upright plate-like portions and a flat plate-like portion that connects the upper end portions of the two upright plate-like portions. That is, in this embodiment, when the rotating fence member 12 is placed in the unused position, it is sufficient to rotate the rotating fence member 12 until a part (a predetermined part) of the rotating fence member 12 fits into the unused position restriction means (retaining metal fitting). Therefore, the unused position restriction means also functions as a positioning means when the rotating fence member 12 is changed to the unused position.

[0075] Alternatively, the unused position restricting means may be a metal fitting, one part of which is engageable with a part of the first reinforcing body component 27a and another part of which is engageable with a part of the rotating fence member 12. That is, after the rotating fence member 12 is rotated, a metal fitting may be engaged with a part of the first reinforcing body component 27a (a part of the load receiving platform 11) and a part of the rotating fence member 12, thereby maintaining the unused position of the rotating fence member 12. The unused position restricting means may also be a string-like (rope-like) member, and may be configured to fasten the rotating fence member 12 to the load receiving platform 11 or another rotating fence member 12, thereby maintaining the unused position of the rotating fence member 12 or two rotating fence members 12.

[0076] As shown in Figures 8(c) and 12(a), when the cylinder member 17 is operated after the two rotating fence members 12 have been changed from the in-use position to the out-of-use position, the slide portion 16 slides forward, and the platform lifting device 1 transitions to the stored state (see Figure 12(b)). At this time, the platform 11 slides along with the slide portion 16, but as described above, the rotating fence members 12 in the out-of-use position do not interfere with the members surrounding the platform 11, allowing for smooth sliding of the platform 11 and the rotating fence members 12. Furthermore, as described above, because the rotating fence members 12 do not extend beyond the sides of the platform 11, problems caused by the rotating fence members 12 coming into contact with other vehicles or roadside installations while the vehicle 3 is traveling can be prevented.

[0077] On the other hand, when switching from the storage state to the working state, the switching procedure is reversed. That is, the loading platform lifting device 1 slides the slide portion 16 rearward to place the rotating fence member 12 in the use position. Then, the loading platform lifting device 1 lowers the tip end of the arm portion 22 to place part of the loading platform 11 in contact with the ground. As a result, the gap formed between part of one main surface of the first platform portion 26a and part of one main surface of the second platform portion 26b is larger than when the loading platform 11 is in the folded state. In this state, the second platform portion 26b rotates, causing the loading platform 11 (load platform main body 26) to transition from the folded state to the unfolded state.

[0078] The receiving platform lifting device 1 may also slide the slide portion 16 rearward, place the receiving platform 11 in the unfolded state while the slide portion 16 is in that state, and then place the rotating fence member 12 in the in-use position. The receiving platform lifting device 1 may also place the receiving platform 11 in the unfolded state while the rotating fence member 12 is in the unused position, and perform loading and unloading of cargo without the rotating fence member 12 functioning as a fence. However, from the standpoint of safety, the receiving platform lifting device 1 is designed to perform loading and unloading of cargo with the rotating fence member 12 in the in-use position. In other words, the receiving platform 11 can be raised and lowered even with the rotating fence member 12 in the unused position, but from the standpoint of ensuring safety, it is preferable to place the rotating fence member 12 in the in-use position at least when raising and lowering the platform 11.

[0079] Here, when the loading platform lifting device 1 of this embodiment changes the position of the rotating fence member 12 to the in-use position, it rotates the rotating fence member 12 to a position where the platform side regulating portion 28 and the fence side regulating portion 60 overlap in the front-to-back direction, as shown in Figure 3. In other words, the platform-side restricting portion 28 and the fence-side restricting portion 60 also function as positioning means when changing the position of the rotating fence member 12 to the in-use position. That is, the operator simply rotates the rotating fence member 12 to a position where the platform-side insertion hole 28a (see FIG. 4) of the platform-side restricting portion 28 and the fence-side insertion hole 60a of the fence-side restricting portion 60 overlap in the front-to-rear direction. After rotating the rotating fence member 12, inserting parts of the insertion / removal member 30 into these holes prevents the rotating fence member 12 from changing its position unintentionally.

[0080] 3, when the rotating fence member 12 is changed to the in-use position, the side surface of the connector forming portion 56b located on the inside in the left-right direction abuts against the side surface of the first platform component 26a (part of the side surface forming portion 35). In other words, the worker simply rotates the rotating fence member 12 until the side surface of the connector forming portion 56b abuts against the side surface of the first platform component 26a (the receiving platform main body 26), which makes it easy to position the rotating fence member 12 when changing its position. In other words, the side surface of the connector forming portion 56b and the side surface of the first platform component 26a also function as a positioning means when the rotating fence member 12 is changed to the in-use position.

[0081] In the above-described embodiment, the rotating fence member 12 is attached to the first base component 26a. However, the rotating fence member 12 may be attached to the second base component 26b. In this case, the base-side restricting portion 28 may be a protrusion protruding from one main surface of the second base component 26b. Furthermore, when the rotating fence member 12 is in the unused position, it may be disposed above the other main surface of the second base component 26b and on the outer side of the second reinforcement component 27b in the left-right direction (see FIG. 11). Furthermore, the unused position restricting means described above may be provided on the other main surface of the second base component 26b. Furthermore, the unused position restricting means may be a metal fitting that engages with a part of the second reinforcement component 27b instead of a part of the first reinforcement component 27a.

[0082] Furthermore, in the above-described embodiment, the receiving platform is configured as being divided into two plate-shaped members, but the receiving platform may be configured as being divided into three or more plate-shaped members. The rotating fence member 12 may be attached to one or more of the three or more plate-shaped members that make up the receiving platform.

[0083] The present invention is not limited to the above-described loading platform lifting / lowering device 1, but may be, for example, a loading platform lifting / lowering device 301 as shown in Fig. 13. Note that the same parts as those in the above-described embodiment are given the same reference numerals, and detailed description thereof will be omitted. The receiving platform lifting device 301 of this embodiment has a platform drive mechanism (lifting mechanism, detailed illustration omitted), a receiving platform section 311 (receiving platform), and a rotating fence member 12.

[0084] The loading platform lifting device 301 of this embodiment can be switched between a traveling state (see FIG. 13(a)) in which the vehicle 303 is traveling, and a working state (see FIG. 13(b)) in which cargo is being loaded and unloaded. Also, as shown in FIG. 14, in the working state, the loading platform section 311 can be raised and lowered between an upper position (see FIG. 14(a)) and a lower position (see FIG. 14(b)).

[0085] As shown in Figure 13, the receiving platform portion 311 has a receiving platform main body portion 326 which is a plate-shaped member, and the receiving platform main body portion 326 has a thickness in the front-to-back direction when in the traveling state (see Figure 13(a)), and a thickness in the up-to-down direction when in the working state (see Figure 13(b)). Here, in the vehicle 303 of this embodiment, a space in which luggage is placed is formed above the lower wall 307 (see FIG. 13(b)) that forms the floor surface of the luggage bed portion, and between the two side wall portions 308. When the luggage receiving platform main body 326 is in the traveling state (see FIG. 13(a)), it stands upright so as to cover the space in which luggage is placed from behind.

[0086] As shown in Figure 13(b), the receiving platform 311 (receiving platform main body 326) has a receiving surface portion 333 that forms the receiving surface on which luggage is placed. In this embodiment, the receiving surface portion 333 is the upper surface of the receiving platform main body 326 when the receiving platform 311 is in the working state. The receiving platform 311 also has a back surface forming portion 334, which is the main surface on the opposite side of the receiving surface portion 333 in the thickness direction of the receiving platform main body 326. The back surface forming portion 334 is the lower surface of the receiving platform main body 326 when the receiving platform 311 is in the working state. Furthermore, the receiving platform 311 has a side surface forming portion 335. The side surface forming portion 335 is the side surface (end surface in the left-right direction) of the receiving platform main body 326 when it is in the working state.

[0087] The load receiving platform 311 has a platform-side restricting portion 328 (first restricting means forming portion, use posture restricting means). The platform-side restricting portion 328 is a protrusion that protrudes outward (upward in the working state) from the load receiving surface 333. The platform-side restricting portion 328 has substantially the same structure as the platform-side restricting portion 28 described above, and detailed description thereof will be omitted. Furthermore, the receiving platform portion 311 has a fence accommodating recess 332. The fence accommodating recess 332 is formed in the receiving platform main body portion 326, has openings in the back surface forming portion 334 and one of the two side surface forming portions 335, and is a recess that is recessed from the back surface forming portion 334 side toward the receiving surface portion 333 side.

[0088] In this embodiment, the rotating fence member 12 is rotatably attached to the bottom surface of the fence housing recess 332. When the rotating fence member 12 is in the unused position, the entire rotating fence member 12 is disposed within the fence housing recess 332. Furthermore, the bottom surface of the fence housing recess 332 is provided with the unused position restriction means (not shown).

[0089] When the load-receiving platform 311 is placed in the upper position during operation, the load-receiving surface 333 is located at the same height as the floor (the upper surface of the lower wall 307) (see FIG. 14(a)). On the other hand, when the load-receiving platform 311 is placed in the lower position during operation, the lower surface of the load-receiving platform main body 326 comes into contact with the ground (see FIG. 14(b)). In the loading platform lifting device 301 of this embodiment, the loading platform main body 326 is rotated from the traveling state so that the thickness direction of the loading platform main body 326 is in the vertical direction and the back surface forming part 334 is separated upward from the ground, and the position of the rotating fence member 12 can be changed (see FIG. 13(b)). That is, by rotating the rotating fence member 12 in this state, the position of the rotating fence member 12 changes between the non-use position and the use position. Even in this embodiment, when the vehicle 3 is traveling, a part of the rotating fence member 12 does not protrude to the left or right outside of the cargo receiving platform main body 326, which prevents problems such as the protruding rotating fence member 12 or the like colliding with other vehicles traveling on the same road.

[0090] Furthermore, the present invention may be a loading platform lifting device 401 as shown in FIG.

[0091] The receiving platform lifting / lowering device 401 of this embodiment can also be switched between a traveling state (see FIG. 15(a)) in which the vehicle 403 is traveling, and a working state (see FIG. 15(b)) in which cargo is being loaded and unloaded. Also, as shown in FIG. 16, in the working state, the receiving platform section 411 (receiving platform) can be raised and lowered between an upper position (see FIG. 16(a)) and a lower position (see FIG. 16(b)).

[0092] The receiving platform portion 411 of this embodiment has a receiving platform main body portion 426 which is a plate-shaped member. The receiving platform main body 426 differs from the receiving platform main body 326 described above in the position where the platform-side restricting portion 328 is formed. Furthermore, in the receiving platform lifting device 401, the position at which the fence accommodating recess 332 is formed in the receiving platform section 411 (receiving platform main body section 426) is different from that of the receiving platform section 311 (receiving platform main body section 326) described above. Furthermore, the platform lifting device 401 has a platform drive mechanism (lifting mechanism) that is different from that of the above-described platform lifting device 301. That is, in the above-described platform lifting device 301, when the platform section 311 is raised and lowered between the upper and lower positions, the platform section 311 (platform main body section 326) slides up and down (see FIG. 14). That is, the lifting device main body section of the platform lifting device 301 is a so-called vertical lifting type lifting device. In contrast, in the receiving platform lifting device 401 of this embodiment, when the receiving platform section 411 is moved from the upper position to the lower position, the receiving platform section 411 moves in an arc downward toward the rear, as shown in Fig. 16. When the receiving platform section 411 is moved from the lower position to the upper position, the receiving platform section 411 moves in the opposite direction, upward toward the front.

[0093] Furthermore, the present invention may be a loading platform lifting device 501 as shown in FIG.

[0094] The receiving platform lifting device 501 of this embodiment has a platform drive mechanism (lifting mechanism, detailed illustration omitted), a receiving platform unit 511 (receiving platform), and a rotating fence member 12.

[0095] The loading platform lifting device 501 of this embodiment can be switched between a traveling state (see FIG. 17(a)) in which the vehicle 503 is traveling, and a working state (see FIG. 17(b)) in which cargo is being loaded and unloaded. Also, as shown in FIG. 18, in the working state, the loading platform section 511 can be raised and lowered between an upper position (see FIG. 18(a)) and a lower position (see FIG. 18(b)).

[0096] Here, vehicle 503 of this embodiment has box-shaped cargo box main body 504 with an open rear end. Load receiving platform lifting device 501 of this embodiment is a device that is so-called a backpack-type storage device, and load receiving platform 511 (load receiving platform main body 526) functions as a blocking part that blocks a part of the open part at the rear of cargo box main body 504 when in a traveling state. That is, as shown in Figure 17, the receiving platform 511 has a receiving platform main body 526 which is a plate-shaped member. Also, as shown in Figure 17(b), the receiving platform main body 526 has a receiving surface 533 which forms the receiving surface on which luggage is placed. In this embodiment, the receiving surface 533 is the upper surface of the receiving platform main body 526 when the receiving platform 511 is in the working state, and is the front surface when the platform is in the traveling state. That is, the receiving surface 533 faces the internal space of the cargo box main body 504 when the platform is in the traveling state.

[0097] Furthermore, the receiving platform 511 has a back surface forming portion 534 which is the main surface on the opposite side in the thickness direction of the receiving platform main body 526 from the receiving surface portion 533. The back surface forming portion 534 is the underside of the receiving platform main body 526 when the receiving platform 511 is in the working state. Furthermore, the receiving platform 511 has a side surface forming portion 535 which is the side surface (end surface in the left-right direction) of the receiving platform main body 526 when it is in the working state.

[0098] The load-receiving platform 511 has a platform-side restricting portion 528 (first restricting means forming portion, use posture restricting means). The platform-side restricting portion 528 is a protrusion that protrudes outward (upward in the working state) from the load-receiving surface 533. The platform-side restricting portion 528 has substantially the same structure as the platform-side restricting portion 28 and the platform-side restricting portion 328 described above, and detailed description thereof will be omitted.

[0099] In this embodiment, the rotating fence member 12 is rotatably attached to the back surface forming portion 534, and the aforementioned unused position restricting means (not shown) is provided on the back surface forming portion 534. When the rotating fence member 12 is in the unused position, the entire rotating fence member 12 is positioned inside the left and right ends of the load receiving platform main body 526 in the same direction (see Figure 17(a)).

[0100] In the loading platform lifting device 501 of this embodiment, the loading platform main body 526 is rotated from the traveling state so that the loading surface 533 becomes the upper surface of the loading platform main body 526 and the back surface forming part 534 is separated upward from the ground, and the position of the rotating fence member 12 can be changed (see FIG. 17(b)). That is, by rotating the rotating fence member 12 in this state, the position of the rotating fence member 12 changes between the non-use position and the use position.

[0101] When the load-receiving platform 511 is in the upper position during operation, the load-receiving surface 533 is at the same height as the floor of the container body 504 (see Figures 17(b) and 18(a)). When the load-receiving platform 511 is in the lower position during operation, at least a portion of the lower end comes into contact with the ground (see Figure 18(b)). [Explanation of symbols]

[0102] 1,301,401,501 Loading platform lifting device 3,303,403,503 vehicles 10 Drive mechanism (lift mechanism) 11,311,411,511 Receiving platform (receiving platform) 12 Rotating fence member (fence member) 28,328,528 Base side regulating section (first regulating means forming section, use posture regulating means) 30 Insertion / extraction member 33,333,533 Load receiving surface section 34,334,534 Back side forming part 35,335,535 Side forming part 50 Support section (extensible section) 60 Fence side regulating part (second regulating means forming part, use posture regulating means)

Claims

1. A load receiving platform lifting device that is mounted on a vehicle and forms part of the vehicle, the load receiving platform having a lifting mechanism that raises and lowers the load receiving platform, and a fence member attached to the load receiving platform, The loading platform has a loading surface portion that forms an upper surface when the loading platform is capable of loading a load, a back surface forming portion that forms a surface that faces the ground when the loading platform is capable of loading a load, and a side surface forming portion that forms a side surface when the loading platform is capable of loading a load, the fence member changes its position between a use position and a non-use position, and when changing its position from the non-use position to the use position, at least a part of the fence member moves within a range including a position away from the back surface forming portion in the vertical direction to a position away from the side surface forming portion laterally and outwardly, A loading platform lifting device in which, when in the in-use position, at least a portion of the fence member is located laterally outward of the side forming portion and in a range from the side of the side forming portion to above the loading surface portion.

2. A loading platform lifting device as described in claim 1, wherein the fence member can be changed from the non-use position to the use position with at least a portion of the back forming portion facing the ground, and during this position change, a portion of the fence member moves from a position further below the portion of the back forming portion facing the ground to a position further to the side and outward than the side forming portion, and then to a position above the loading surface portion.

3. 3. The loading platform lifting device according to claim 1, wherein the fence member has an expandable portion that is expandable in the in-use position, and the length can be adjusted by expanding and contracting the expandable portion.

4. The loading platform lifting device according to claim 1 or 2, wherein the fence member is positioned entirely inside the side surface forming portion when the fence member is in the unused position.

5. When changing the posture from the unused posture to the used posture, the fence member rotates around a position closer to the ground than the back surface forming portion as a rotation center, 3. The loading platform lifting device according to claim 1, further comprising a use position restricting means for restricting a change in the position of said fence member when said fence member is in said use position.

6. The use position restricting means has a first restricting means forming portion provided on one of the load receiving platform and the fence member, a second restricting means forming portion provided on the other, and an inserting / removing member, A loading platform lifting device as described in claim 5, wherein a hole portion formed in the first regulating means forming portion and a hole portion formed in the second regulating means forming portion are overlapped to form a communicating hole, and the change in posture of the fence member is regulated by inserting the insertion / removal member into the communicating hole.

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