Loading platform lifting device

Abstract

To provide a loading platform lifting device capable of skillfully performing unloading work in a region on a rear side of a vehicle under a limited unloading work condition.SOLUTION: There is targeted a loading platform lifting device which comprises a loading platform lifted and lowered between a loading box of a vehicle and a ground surface, and fitted to a rear side of the vehicle. The loading platform is provided with a flap part capable of protruding into an outside region at a sideward part thereof, and the flap part is configured to change between a protrusion attitude in which the flap part protrudes into the outside region and a storage attitude in which the flap part is stored in a region inside the protrusion state.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a loading platform lifting device that is attached to the rear side of a vehicle and is used to load and unload luggage between the ground and the floor of a cargo box. [Background technology]

[0002] Some loading platform lifting devices support loading and unloading operations by rotating an arm (parallel link) up and down relative to the floor of the cargo box of a vehicle, thereby moving the loading platform attached to the arm up and down in parallel, while others raise and lower the loading platform along posts fixed to the left and right rear ends of the cargo box. With either loading platform lifting device, when the cargo box floor and the cargo loading surface of the loading platform are approximately flush, cargo can be moved from inside the cargo box toward the rear of the vehicle and placed on the loading platform, and the loading platform can then be lowered to unload the cargo. Furthermore, with the cargo placed on the loading surface, the loading platform can be raised until it is approximately flush with the cargo box floor, allowing the cargo to be moved from the loading surface to the cargo box floor at the front of the vehicle.

[0003] There are various shapes of receiving platforms on which cargo is placed, and some have a step from the ground that is equal to the thickness of the receiving platform. As a means of eliminating such a step, a configuration in which a pivotable flap is provided at the tip of the receiving platform to change it into a sloped shape is known (Patent Document 1). By using such a flap, cargo (for example, a dolly) placed on the receiving platform can be smoothly loaded and unloaded from the ground. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-002851 Summary of the Invention [Problem to be solved by the invention]

[0005] While such known loading platform lifting devices are extremely useful for loading and unloading cargo at the rear of a vehicle, the inventors focused on further improving the convenience of loading platform lifting devices mounted at the rear of a vehicle.

[0006] Known loading platform lifting devices are used to load and unload luggage along the longitudinal direction of a vehicle. Specifically, when unloading luggage from a luggage box, the luggage is moved from the luggage box to a luggage platform at the rear of the vehicle, and after the luggage platform is grounded, the luggage is unloaded from the luggage platform into a space at the rear of the vehicle. The reverse procedure is followed when loading luggage into the luggage box. In other words, loading and unloading luggage requires a minimum amount of space behind the luggage platform that extends rearward from the luggage box to place the luggage to be unloaded.

[0007] However, when parking a vehicle to load or unload luggage, it is not always possible to secure sufficient space for placing the luggage, in addition to the space for extending the loading platform toward the rear of the vehicle. In particular, as described above, in order to move luggage in the fore-and-aft direction of the vehicle, it is necessary to secure these spaces along the fore-and-aft direction of the vehicle.

[0008] SUMMARY OF THE INVENTION An object of the present invention is to provide a loading platform lifting device that can successfully perform loading and unloading operations even when the working conditions for loading and unloading luggage are limited in the rear area of ​​a vehicle. [Means for solving the problem]

[0009] To achieve the above object, the present invention provides a loading platform lifting device mounted on the rear side of a vehicle, in which the loading platform has a flap portion provided on a side portion thereof that can protrude outward. Furthermore, the flap portion is configured to be positionally changeable between a protruding position in which it protrudes outward and a stored position in which it is stored in an area more inward than the protruding position. The flap portion may have a fixed portion fixed to the side portion, a first axle portion fixed to the fixed portion and having a longitudinal direction in the fore-and-aft direction of the vehicle, and a first flap portion pivoted on the first axle and rotatable in a circumferential direction thereof, and the first flap portion may be configured to have a restricting portion that restricts the circumferential rotation of the first flap portion when it is in an upright position. Alternatively, the flap portion may have a fixed portion fixed to a side region, a first axle portion fixed to the fixed portion and having a longitudinal direction in the front-to-rear direction of the vehicle, and a first flap portion pivoted on the first axle and rotatable in its circumferential direction, and when the position is changed from the extended position to the stored position, the first flap portion pivots in the circumferential direction of the first axle and becomes overlapped in the inner region. Alternatively, the flap portion may have a fixed portion fixed to a side region, the first flap portion supported by the fixed portion and capable of protruding into the outer region, a second axle portion fixed to the first flap portion and having a longitudinal direction in the front-to-rear direction of the vehicle, and the second flap portion pivoted on the second axle and rotatable in its circumferential direction. [Effects of the Invention]

[0010] According to the present invention, the flap portion can be extended in a direction intersecting the longitudinal direction of the vehicle, which allows for efficient loading and unloading of cargo even when the space behind the vehicle is limited, thereby enhancing the versatility of the loading platform lifting device and helping to improve the speed and safety of workers' work. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a perspective view showing a state in which a loading platform lifting device according to an embodiment of the present invention is attached to a vehicle, and FIG. 2 is a side view of the loading platform lifting device according to the embodiment. [Figure 2]FIG. 1 is a plan view of a loading platform in an expanded state of a loading platform lifting device according to an embodiment of the present invention; [Figure 3] FIG. 1 is a front view of a loading platform showing a change in the position of a flap portion provided in a loading platform lifting device according to an embodiment of the present invention; [Figure 4] 1 is an explanatory diagram of a flap portion provided in a loading platform lifting device according to an embodiment of the present invention; [Figure 5] FIG. 10 is an explanatory diagram of a flap portion provided in a loading platform lifting device according to another embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0013] FIG. 1(a) is a perspective view of the rear of a vehicle 200 equipped with a platform lifting device 100 according to one embodiment of the present invention, and FIG. 1(b) is a side view of the platform lifting device 100 illustrating the lifting and lowering operation of the platform 2 behind the cargo box 1. In this specification, the terms "front" and "back" are defined relative to the vehicle. That is, the front direction (diagonally upward and to the left in FIG. 1) of the driver's seat (not shown) of the vehicle 200 is defined as the front. The platform lifting device 100 shown in FIG. 1 is a device that supports cargo handling operations by raising and lowering the platform 2 using parallel links, and is primarily used for loading and unloading cargo between the cargo box and the ground. The platform lifting device 100 according to this embodiment raises the platform 2 relative to the cargo box 1 to store it in a stowed position while the vehicle 200 is traveling. The platform lifting device 100 includes a support frame 3, left and right lift arms 4, the platform 2, left and right lift cylinders 5, and left and right tilt cylinders 6.

[0014] In this embodiment, the drive device that drives the loading platform 2 includes two hydraulic cylinders. The lift cylinder 5 is used to raise and lower the loading platform 2, and the tilt cylinder 6 is used to tilt the loading platform 2. The lift cylinder 5 is mainly used during loading and unloading operations, and the tilt cylinder 6 is used when storing the loading platform 2 (moving it to the stored position). The lift cylinder 5 and tilt cylinder 6 are single-acting hydraulic cylinders, but double-acting cylinders may also be used.

[0015] First, the support frame 3 is a base structure of the loading platform lifting device 100 that is attached to the vehicle 200, and is attached to the rear lower side of the chassis frame of the vehicle 200. Bumpers B1-B3 extending in the left and right directions are attached to the rear end surface of the support frame 3. The bumpers B1-B3 are lined up on the left and right, and a predetermined gap is provided between the central bumper B1 and the left and right bumpers B2, B3 to allow the left and right lift arms 4, which rotate up and down, to pass through.

[0016] The lift arm 4 is a member that rotates up and down relative to the vehicle, and is connected to the support frame 3 via a tilt arm 7. As shown in FIG. 1(b), the upper end of the tilt arm 7 is connected to the support frame 3 via a pin P0 that extends left and right, and the tilt arm 7 is rotatable relative to the support frame 3 around the pin P0. The base end (front end) of the lift arm 4 is connected to the tilt arm 7 via a pin P1 that extends left and right at a position below the pin P0. The lift arm 4 is rotatable relative to the tilt arm 7 around the pin P1. The tip end (rear end) of the lift arm 4 is connected to the upper part of the base end portion of the load receiving platform 2 via a pin P2 that extends left and right. In other words, the load receiving platform 2 is connected to the tip of the lift arm 4 so that it can rotate up and down around the pin P2.

[0017] The tilt cylinder 6 is a hydraulic cylinder that rotates (tilts) the loading platform 2 up and down relative to the lift arm 4. The base end (front end) of the tilt cylinder 6 is connected to the support frame 3 via pin P3, which extends left and right at a position lower than pin P1. The tilt cylinder 6 is rotatable relative to the support frame 3 around pin P3. The tip end (rear end) of the tilt cylinder 6 is connected to the lower part of the base end portion of the loading platform 2 via a pin (not shown) that extends left and right. The tilt cylinder 6 and the loading platform 2 are rotatable relative to each other around this pin.

[0018] The lift cylinder 5 is a hydraulic cylinder that rotates the lift arm 4 up and down to raise and lower the loading platform 2. The base end (front end) of the lift cylinder 5 is connected to the tilt arm 7 via pin P4, which extends left and right at a position lower than pin P3. The lift cylinder 5 is rotatable relative to the tilt arm 7 around pin P4. The tip end (rear end) of the lift cylinder 5 is connected to the lower part near the tip of the lift arm 4 via pin P5, which extends left and right. The lift cylinder 5 and the lift arm 4 are rotatable relative to each other around pin P5.

[0019] Here, the tilt cylinder 6 also serves as a link arm that, together with the tilt arm 7 and lift arm 4, constitutes a parallel link. When the tilt cylinder 6 contracts and the loading platform 2 becomes horizontal, the lift cylinder 5 expands and contracts, causing the lift arm 4 and tilt cylinder 6 to rotate while maintaining their parallel position, and the loading platform 2 moves up and down in a parallel manner. At this time, the loading platform 2 is raised and lowered while maintaining its horizontal position. However, when the loading platform 2 is lowered and touches the ground, if the lift cylinder 5 contracts further, the tilt arm 7 will rotate backward (counterclockwise in Figure 1(b)) around pin P0 as a fulcrum. As a result, pin P1 attached to the tilt arm 7 moves backward relative to pin P3 attached to the support frame 3 (the lift arm 4 moves backward relative to the tilt cylinder 6), and the loading platform 2 tilts backward until its tip touches the ground (as indicated by the dashed line).

[0020] When the tilt cylinder 6 is extended or retracted, the cargo receiving platform 2 rotates around pin P2 as a fulcrum relative to the lift arm 4, causing it to tilt. When the tilt cylinder 6 is extended while the cargo receiving platform 2 is positioned at the height of the floor surface 1F of the cargo box 1, the cargo receiving platform 2 rises along the rear surface of the cargo box A of the vehicle and moves to a stored position (see Figure 1(a)). Conversely, when the tilt cylinder 6 is retracted, the cargo receiving platform 2 in the stored position can be deployed to a reference angle (for example, horizontal) and made available for loading and unloading operations.

[0021] 2 is a plan view showing the receiving platform 2 in a horizontal position at the height of the floor surface 1F of the cargo box 1. The receiving platform 2 according to this embodiment has a receiving platform main body 21 that is rectangular in plan view, and a flap portion 22 is provided at a lateral portion of this receiving platform main body 21, on the port side of the vehicle 200 (the right side in the figure). As shown in the figure, a portion of this flap portion 22 is in a position that protrudes outside the receiving platform main body 21.

[0022] The flap portion 22 has a fixed portion 221 fixed to a side portion of the loading platform main body 21, a first flap portion 222 protruding from the side portion toward an outer region, a second flap portion 223 located in an area further outward from the first flap portion 222, a first shaft portion 224 attached to the fixed portion 221 and pivotally supporting the first flap portion 222, and a second shaft portion attached to the first flap portion 222 and pivotally supporting the second flap portion 223. As shown in the figure, each of these shaft portions has its longitudinal direction in the fore-and-aft direction of the vehicle (the up-and-down direction in the figure) and is provided so as to be shorter than the length (dimension along the fore-and-aft direction of the vehicle) of the loading platform main body 21. The first shaft portion 224 is provided via a hinge portion T224, and three of these hinge portions T224 are provided at predetermined intervals along the fore-and-aft direction of the vehicle.

[0023] The first flap portion 222 is rotatable in the circumferential direction of the first shaft portion 224, and is able to change its position by being rotated so as to overlap the fixed portion 221. The second flap portion 223 is rotatable in the circumferential direction of the second shaft portion 225, and is able to change its position by being rotated so as to overlap the first flap portion 222. A holding portion 226 that maintains the state in which the second flap portion 223 overlaps the first flap portion 222 is provided on the vehicle front side of the fixed portion 221. As shown in the enlarged view, the holding portion 226 has a plate portion 2261 that is fixed to the upper surface of the fixed portion 221 and has a hat-shaped cross section, and a pin-shaped portion 2262 that is attached to the upper surface of the plate portion 2261 and is biased in the fore-and-aft direction of the vehicle (the up-and-down direction in the figure), and is able to protrude toward the vehicle rear side. The pin-shaped portion 2262 includes a cylindrical member 2262a whose longitudinal direction is the vehicle longitudinal direction, a spring member 2262b provided within the cylindrical member 2262a, a pin member 2262c that is biased toward the rear of the vehicle (upward in the figure) by the biasing force of the spring member 2262b, and a lever member 2262d fixed to the circumferential surface of the pin member 2262c and protruding perpendicular to the longitudinal direction of the pin member 2262c. The cylindrical member 2262a is provided with a notch portion 2262e for permitting or restricting movement of the lever member 2262d. When the lever member 2262d is grasped and moved to the lower end of the notch portion 2262e, the spring member 2262b is pushed by the pin member 2262c and contracts. When the lever portion 2262d is released from this state, the pin material 2262c is moved toward the rear of the vehicle by the biasing force of the spring material 2262b, and as shown in the figure, it protrudes from the plate portion 2261. At this time, it becomes capable of being engaged with a stopper portion provided on the second plate portion 223, which will be described later.

[0024] Next, the function of the flap portion 22 will be further explained using Figure 3. Figure 3 shows the load receiving platform 2 in the horizontal position as shown in Figure 2, viewed from the front of the vehicle toward the rear of the vehicle. The flap portion 22 is configured to be changeable between a protruding position as shown in Figure 2 and a folded and stored position in the inner region of the load receiving platform main body 21, and the flap portion 22 can be changed from the stored position to the protruding position in the order of Figures 3(a) to 3(d).

[0025] In the loading platform lifting device 100 according to this embodiment, when the flap portion 22 is not in use, it is in a state where it overlaps the inner region of the loading platform main body 21 (folded and stored state) as shown in FIG. 3(a). A stopper portion 227, which is an elongated plate material and can restrict a change in the position of the flap 22, is provided on the side portion (front portion of the vehicle) of the second plate portion 223. One end of the stopper portion 227 is pivotally supported by a pin P223 provided on the second plate 223, and the other end is formed in a part of the stopper portion 227, through which the pin material 2262c can be engaged and disengaged. When the flap portion 22 is in the overlapping state shown in the figure, the pin material 2262c protrudes from the plate portion 2261 and is inserted into the elongated hole 227a, thereby engaging the stopper portion 227.

[0026] Next, when using the receiving platform lifting device 100, the receiving platform 2 is placed in a horizontal position (see FIG. 1(b)). At this time, the first flap portion 222 and the second flap portion 223 of the flap portion 22 can be held by hand and changed to an upright position as shown by the arrow in FIG. 3(b). During this change in position, the pin material 2262c is engaged with the long hole 227a, so that the flap portion 22 is restricted from changing its position outward from the upright position shown in the figure, and the flap portion 22 can be used as a fall prevention member to prevent luggage placed on the receiving platform 2 from falling sideways.

[0027] When the flap portion 22 is used to move a load to the outside of the loading platform main body 21, the lever portion 2262d is manually operated to remove the pin material 2262c from the elongated hole 227a, and at that timing, the position of the flap portion 22 is changed to a state in which it protrudes to the outside area as shown in Fig. 3(c). Specifically, the first flap portion 222 rotates clockwise around the first shaft portion 224 as shown in the figure, and the second flap portion 223 rotates counterclockwise around the second shaft portion 225.

[0028] As shown in the figure, the second shaft 225 is provided on the side of the contact surface between the first flap portion 222 and the second flap portion 223 when they are overlapped, so that when the first flap portion 222 and the second flap portion 223 are substantially flush (substantially in a straight line) as shown in Figure 3(d), their end surfaces come into contact with each other, restricting further rotation. Therefore, when the flap portion 22 is in a substantially straight line and protruding into the outer region as shown in the figure, the flap portion 22 can be prevented from bending downward, and the flap portion 22 can be used safely when moving luggage placed on the luggage receiving platform main body 21.

[0029] By being able to use the flap portion 22 to move luggage, the usage of the luggage receiving platform lifting device 100 is not limited to moving luggage further rearward of the luggage receiving platform 2, thereby improving its versatility. For example, when unloading luggage from a cargo box 1, the luggage receiving platform 2 is lowered with the luggage placed on it. At this time, if there is not enough space to unload the luggage further rearward of the luggage receiving platform 2, the luggage can be unloaded on the side of the vehicle (the port side of the vehicle 200) rather than the rearward side of the vehicle. Being able to unload luggage on the side of the vehicle is preferable because it increases the flexibility of the stopping position of the vehicle 200.

[0030] Furthermore, before the loading platform 2 is lowered to its lowest position, if the location where the load is to be unloaded is higher than the ground, the flap portion 22 can be made substantially linear to match that location, as shown in FIG. 3(d). However, even if the location where the load is to be unloaded is lower than the loading platform 2, as shown in FIG. 4(a), the second flap portion 223 can rotate downward about the second shaft portion 225, thereby providing a slope function. This allows the load to be unloaded smoothly even if there is a step H between the loading platform 2 and the location where the load is to be unloaded. In particular, in the case of the loading platform lifting device 100 according to this embodiment, when the loading platform 2 is lowered in a horizontal position and touches the ground, the loading platform 2 changes its position to a rearward tilted position until its tip touches the ground. Therefore, stopping the lowering operation when or before the loading platform 2 touches the ground is also advantageous in that the loading platform 2 can be used to unload the load to the side of the vehicle while remaining in a horizontal position, using the flap portion 22. In addition, as shown in Figure 4(b), even if there is an obstacle that could become a convex part, such as a curb ST of height H2, around the loading platform 2 that you want to touch down, it is also preferable because the tip of the second flap portion 223 can be successfully brought over the obstacle and touch down, thereby relaxing the stopping conditions of the vehicle 200.

[0031] As described above, the application of the platform lifting device 100, which allows for the unloading of cargo on the side of the vehicle 200, not only alleviates space limitations on the rear side of the vehicle 200, but also significantly improves the speed and safety of cargo transport operations after unloading. When the vehicle 200 stops at the left edge of the road, the driver typically stops the vehicle 200 close to the sidewalk. The sidewalk often has a slight step above the roadway on which the vehicle 200 travels. When the platform lifting device 100 is used to unload cargo on the rear side of the vehicle, the cargo must be transported over the step to the sidewalk. Therefore, if a dolly is used for transporting the cargo, it would be time-consuming to overcome the step. However, by using the flap portion 22 according to this embodiment, the cargo can be directly transported from the platform 2 to the sidewalk. In other words, significant benefits can be obtained in terms of the speed and safety of transport operations using a dolly or the like.

[0032] The above-mentioned functions and effects have been explained using the example of unloading cargo from the cargo box 1 using the cargo receiving platform 2, but the same functions and effects can be achieved when loading cargo into the cargo box 1 using the cargo receiving platform 2. Unlike conventional devices, the direction of cargo movement between the cargo box 1 and the cargo receiving platform 2, the direction of rotation of the cargo receiving platform 2 between its upright and horizontal positions, and the direction of cargo movement between the cargo receiving platform 2 and the ground are all along the fore-and-aft direction of the vehicle, but the ability to add a direction of cargo movement between the cargo receiving platform 2 and the ground that is approximately perpendicular to the fore-and-aft direction of the vehicle increases the versatility of cargo loading and unloading operations, which is advantageous in that it leads to improved speed and safety of the work.

[0033] The present invention is not limited to the above-described embodiment. For example, a flap portion according to a different embodiment shown in Fig. 5 can also be applied. For example, Fig. 5(a) shows a flap portion 22A provided at a side end of the loading platform main body 21. By providing the flap portion 22A in the position shown, the loading platform 2 can make full use of the loading area in which loading objects can be placed. Furthermore, when the flap portion 22A is changed to an upright position (dotted line portion), the upright position becomes an outer area, which similarly has the effect of expanding the loading area.

[0034] Also, as shown in FIG. 5(b), a flap portion 22B according to another embodiment can be applied. The flap portion 22B has an extension portion B1 in which the second flap portion 223B extends outward beyond the side end of the receiving platform main body 221. This extension portion B1 allows the flap portion 22B to have a longer protruding area when in the protruding position. This also increases the degree of freedom in loading and unloading luggage onto the receiving platform 2, even overcoming obstacles such as curbs. Furthermore, since the flap portion 22B is provided at the side end of the receiving platform main body 21, similar to the flap portion 22A in FIG. 5(a), a wider luggage placement area can be ensured. In this embodiment, the flap portion 22B is folded and stored within the illustrated inner area.

[0035] Another embodiment may employ a flap 22C configured to abut against the side end surface 21S of the loading platform main body 21, as shown in Figure 5(c). The flap 22C has a fixed portion 221C, a main surface portion 222C having a tapered upper surface, a shaft portion 223C attached to the fixed portion 221C and having its axis center in the longitudinal direction of the vehicle, and a rotating plate 224C journaled by the shaft portion 223C and rotating up and down about the shaft portion 223C. As shown in the figure, the main surface portion 222C is fixed to the rotating tip of the rotating plate 224C. Note that while only portions of the fixed portion 221C, shaft portion 223C, and rotating plate 224C located at one end of the main surface portion 222C are shown in the figure, similar portions are also provided at the other end (rearward in the longitudinal direction of the vehicle).

[0036] In the embodiment shown in FIG. 5(c), when the main surface portion 222C is rotated in the direction indicated by arrow A22 in the figure and changed from a folded storage position (not shown) to a protruding position, the end surface 2221C abuts against the side end surface 21S of the loading platform main body 21, thereby restricting its rotation. When the end surface 2221C and the side end surface 21S are in abutting state, the tip portion of the main surface portion 222C has a tapered surface (a tapered surface that narrows toward the rotation tip) up to a position that extends to a distance H3 below the loading platform main body 21. This tapered surface allows for easy loading and unloading of cargo such as dollies. Note that when the main surface portion 222C is changed to the storage position, the rotation tip 2251C of the rotatable lever portion 225C attached to the fixed portion 221C engages with the insertion hole 2241C provided in the rotation plate 224C, thereby maintaining the storage position of the flap portion 22C.

[0037] As in each embodiment above, the loading platform lifting device 100 provided with the flap portions 22, 22A, 22B, 22C that can protrude laterally has been described, but the loading platform lifting device 100 is not limited to one in which the lift arm 4 rotates up and down to lift and lower the loading platform 2, and can also be applied to a loading platform lifting device of the type in which the loading platform is lifted and lowered along known left and right support columns. Furthermore, in addition to the loading platform lifting device 100 (or the above-mentioned different types of loading platform lifting devices) in which the loading platform 2 is in an upright position when the vehicle is traveling, the present invention can also be applied to similarly known loading platform lifting devices in which the loading platform 2 is retracted below the cargo box 1 and stored (contained).

[0038] Furthermore, although the flap portions 22, 22A, 22B, and 22C are all configured to be rotated to change their positions between the protruding position and the retracted position, they may be flap portions that change their positions using a slide mechanism. [Explanation of symbols]

[0039] 1... cargo box, 2... cargo receiving platform, 3... support frame, 4... lift arm, 5... lift cylinder, 6... tilt cylinder, 21... cargo receiving platform main body, 22... flap portion, 221... fixing portion, 222... first flap portion, 223... second flap portion, 224... first shaft portion, 225... second shaft portion, 226... holding portion, 227... stopper portion, 100... cargo receiving platform lifting / lowering device, 200... vehicle

Claims

1. A loading platform lifting device provided with a loading platform that is raised and lowered between a loading box of a vehicle and the ground and attached to a rear side of the vehicle, The loading platform is provided with a flap portion at its side portion that can protrude to an outer region, The flap portion includes a fixing portion fixed to the side portion; a first flap portion supported by the fixing portion and capable of protruding into the outer region; a second shaft portion fixed to the first flap portion and having a longitudinal direction in the front-rear direction of the vehicle; a second flap portion pivotally supported by the second shaft portion and rotatable in a circumferential direction thereof; and The structure is such that the position can be changed between a protruding position in which the protruding portion protrudes into the outer region and a stored position in which the protruding portion is stored in an inner region than the protruding position. A loading platform lifting device characterized by the above.

2. The flap portion is a first shaft portion fixed to the fixing portion and supporting the first flap portion rotatably in a circumferential direction with the front-rear direction of the vehicle as a longitudinal direction; and The first flap portion is provided with a restricting portion that restricts rotation in the circumferential direction when the first flap portion is in an upright position.

2. The loading platform lifting device according to claim 1.

3. The flap portion is a first shaft portion fixed to the fixing portion and supporting the first flap portion rotatably in a circumferential direction with the front-rear direction of the vehicle as a longitudinal direction; and When the position is changed from the protruding position to the stored position, the first flap portion is rotated in the circumferential direction of the first shaft portion and is placed in an overlapping state in the inner region. The loading platform lifting device according to claim 1 .

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