Work vehicle

Abstract

To provide a work vehicle that allows for easy and smooth loading and unloading of a ladder between the ground and the upper surface of the ceiling wall without the need for installing large-scale equipment on the upper surface of the ceiling wall of the cargo box.SOLUTION: A work vehicle is provided with a cargo box 4 disposed on a chassis 2, a lifting device 5 including a lifting platform 51 that is vertically movable along a rear end of the cargo box 4, and a guide device 6 used to load and unload a ladder between a ground G and a ladder storage bed section 46 on the cargo box 4. The guide device 6 is provided with a guide roller disposed at a position of an upper rear end of the cargo box 4. The guide roller is configured to come into contact with a lower surface of a vertical support of the ladder in a state where a lower end of the ladder is placed on the lifting platform 51, and is configured to roll along the lower surface of the support in accordance with the vertical movement of the lifting platform 51. In a state where the lifting platform 51 is raised to a predetermined height, the guide roller is configured to allow the ladder to be transferred between the ladder storage bed section 46 and the lifting platform 51 while guiding the ladder.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a work vehicle capable of carrying a ladder on a cargo box. [Background technology]

[0002] Conventionally, there are work vehicles such as rescue vehicles used by rescue teams at the scene of an accident or disaster. This type of work vehicle is loaded with a large amount of rescue equipment in a packing box. The rescue equipment includes a ladder that is loaded on top of the packing box. Conventional work vehicles are provided with a dedicated ladder lifting device to enable the ladder to be easily loaded and unloaded between the ground and the top of the packing box (see, for example, Patent Document 1).

[0003] The ladder climbing device of Patent Document 1 includes a bed section that houses a ladder, a base section that guides the bed section to slide in the fore-and-aft direction of the vehicle, and a swivel mechanism that swivels the bed section. In this device, the ladder is stored in the bed section that is located above the luggage box to set it to a ladder-stored state. By operating the operating handle from this ladder-stored state, the bed section is slid rearward a predetermined amount. After that, when a downward external force is applied to the rear end of the bed section, the bed section is rotated by the swivel mechanism to set it to the ladder-lowered state. By performing the reverse operation, the ladder can be returned from the ladder-lowered state to the ladder-stored state. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2011-94403 A Summary of the Invention [Problem to be solved by the invention]

[0005] The ladder climbing device in Patent Document 1 has a lift arm and a slide arm as a rotating mechanism, and has a complex and large structure. In addition, when the ladder is stored, the heavy and large ladder climbing device is placed on the cargo box, which increases the vehicle height and reduces the numerical value of the turning angle.

[0006] The present invention has been made in consideration of the above-mentioned circumstances, and its object is to provide a work vehicle that can easily and smoothly load and unload a ladder between the ground and the top of a cargo box without installing a large-scale device on the cargo box. [Means for solving the problem]

[0007] The inventions disclosed in this specification to solve the above problems are configured as follows: That is, a first invention is characterized in that it comprises a cargo box provided on a vehicle chassis, a lifting device provided at the rear of the cargo box and having a lifting platform that can be raised and lowered along the rear end of the cargo box, and a guide device used for loading and unloading a ladder between the ground and a ladder-storing bed section above the cargo box, the guide device having a guide roller provided at the rear end of the upper surface of the cargo box and rotatable about an axis in the vehicle width direction, the guide roller being configured to abut on the lower surface of a support pillar in the vertical direction of the ladder when the lower end of the ladder is placed on the lifting platform and to roll along the lower surface of the support pillar as the lifting platform rises and falls, and the guide roller being configured to transfer the ladder between the ladder-storing bed section and the lifting platform while guiding the ladder when the lifting platform is raised to a predetermined height position.

[0008] According to the first invention, the guide device used for loading and unloading the ladder between the ground and the ladder storage bed section on the packing box is provided at the rear end of the top surface of the packing box. The main components of this guide device are guide rollers that abut against the lower surfaces of the ladder's posts. Therefore, the guide device only needs to occupy a small space on the upper surface of the ceiling wall of the packing box. The lower end of the ladder is placed on the lifting platform of the lifting device, and the ladder is raised and lowered as the lifting platform rises and falls along the rear end of the packing box, so that it is possible to avoid providing a lifting device for the ladder on the packing box. Since the lifting device can raise and lower the lifting platform along the rear end of the packing box, the lifting device can be used for both loading and unloading the ladder from the ladder storage bed section and loading and unloading materials and equipment into the packing box. This allows the ladder to be easily loaded and unloaded between the ground and the top of the packing box without providing a large-scale device on the packing box and without providing a dedicated large-scale device for the lifting device.

[0009] In addition, the lower end of the ladder and the lower surface of the ladder's support are supported by the lifting platform and the guide roller, and the guide roller rolls along the lower surface of the support as the lifting platform rises and falls, so that the upper end of the ladder can move smoothly forward (backward) relative to the guide roller as the lifting platform rises (falls). This allows the inclination angle of the ladder relative to the ceiling wall of the cargo box to be smoothly reduced (increased) as the lifting platform rises (falls). This allows the ladder to be loaded and unloaded without the upper end of the ladder protruding significantly above the height position of the ceiling wall of the cargo box as the lifting platform rises and falls. In addition, the guide roller is configured to be able to transfer the ladder between the ladder storage bed section and the lifting platform while guiding the ladder when the lifting platform is raised to a predetermined height position, so that workers such as rescue team members can smoothly transfer the ladder with light force while the guide roller supports the weight of the ladder.

[0010] The second invention is characterized in that, in the first invention, the lifting platform is configured to be able to be raised and lowered to at least three different height positions: a ground position where it is grounded on the ground, a packing box floor position where it is at the height of the floor surface of the packing box, and a ceiling position where it is at the height of the ceiling wall of the packing box, and when the lifting platform is raised to the ceiling position, the guide rollers are configured to be able to transfer the ladder between the ladder storage bed section and the lifting platform while guiding the ladder, and when the lifting platform is lowered to the ground position and the lower end of the ladder is placed on the lifting platform, the guide rollers are configured to be able to abut against the upper end of the ladder.

[0011] According to the second invention, the height position of the lifting platform of the lifting device is adjusted to the height position of the ceiling wall of the packing box, and a worker such as a rescue team member can transfer the ladder between the ladder storage bed section and the lifting platform. This allows the worker to transfer the ladder more easily since the difference in height between the ladder storage bed section and the lifting platform is small. In addition, the lifting platform is placed on the ground, and the worker can load and unload the ladder between the lifting platform and the ground. This allows the worker to load and unload the ladder more easily since the difference in height between the lifting platform and the ground is small. In addition, when the lifting platform is lowered to the ground position and the lower end of the ladder is placed on the lifting platform, the guide roller is configured to be able to abut against the upper end of the ladder. Therefore, even if the worker places the ladder against the lifting platform and the guide roller in the ground position to store it after use, and then immediately raises the lifting platform, the ladder can be smoothly guided by the guide roller. In addition, since the lift platform can be adjusted to the height position of the floor surface of the packing box, workers can smoothly load and unload materials and equipment into the packing box.

[0012] The third invention is characterized in that, in the second invention, the platform is provided with a ladder engaging portion for preventing the lower end of the ladder from leaving the upper surface of the platform when loading or unloading the ladder.

[0013] According to the third aspect of the present invention, even if the support point of the guide roller for the ladder is not located sufficiently forward of the vehicle with respect to the center of gravity of the ladder in the front-rear direction, the lower end of the ladder can be prevented from leaving the upper surface of the platform. This allows the lifting and lowering speed of the platform and the lower end (rear end) of the ladder to match, allowing for smooth loading and unloading of the ladder.

[0014] The fourth invention is characterized in that, in the third invention, the guide roller has a first guide roller attached to a fixed bracket so that the height position of the rotation center axis relative to the packing box is fixed, and a second guide roller attached to a movable bracket so that the height position of the rotation center axis can be changed behind and below the first guide roller.

[0015] According to the fourth invention, when the length from the bottom end to the top end of the ladder is not sufficient for the vertical distance between the lifting platform at the ground position and the ceiling wall of the cargo box, the second guide roller, which is behind and below the first guide roller, can support the bottom surface of the top end of the ladder, the bottom end of which is placed on the lifting platform for loading, at a position below the first guide roller. In addition, if the lifting platform is raised from the ground position with the bottom end of the ladder placed on the lifting platform, the inclination angle of the ladder relative to the ceiling wall becomes smaller, which may cause the ladder to hit the rear end of the cargo box, but the first guide roller can support the ladder before it hits the rear end of the cargo box. In addition, when the ladder is lowered from the stored state, even if the top end of the ladder tries to move below the height position of the first guide roller while the lifting platform is descending from the ceiling position to the ground position, the second guide roller can support the top end of the ladder without hitting the rear end of the cargo box. This allows for smooth loading and unloading by utilizing both the first guide roller and the second guide roller, even with a ladder that is relatively short in length from its bottom end to its top end.

[0016] A fifth invention is characterized in that in the fourth invention, the movable bracket is connected to the fixed bracket so as to be freely rotatable up and down, and is biased downward by a biasing member.

[0017] According to the fifth invention, the problem of interference between the movable bracket supporting the second guide roller and the lifting platform can be solved. Specifically, the second guide roller, which is rearward and lower than the first guide roller, protrudes rearward from the rear end of the box, so that when the lifting platform is raised from the ground position to the ceiling position, the second guide roller and the upper surface of the lifting platform come into contact with each other near the ceiling position. However, since the movable bracket supporting the second guide roller can be rotated up and down, when the lifting platform is further raised, the movable bracket can be smoothly rotated upward via the second guide roller by the upper surface of the lifting platform. This allows the lifting platform to be smoothly raised to the ceiling position. In addition, by biasing the movable bracket downward by the biasing member, rattling of the movable bracket during vehicle travel can be suppressed. In addition, when storing the ladder after use, the upper end of the ladder can be reliably supported by the second guide roller with the lower end of the ladder placed on the lifting platform at the ground position. Effect of the Invention

[0018] According to the work vehicle of the present invention, the ladder can be easily and smoothly loaded and unloaded between the ground and the top of the cargo box without providing a large-scale device on the cargo box. [Brief description of the drawings]

[0019] [Figure 1] 1 is a side view of a work vehicle according to an embodiment of the present invention. [Diagram 2] 5 is a side view showing the movement of a lifting platform of the lifting device in the work vehicle according to the embodiment. FIG. [Diagram 3] FIG. 2 is a rear view of the work vehicle according to the present embodiment. [Figure 4] 2 is a side view of a main portion of the work vehicle according to the present embodiment, showing a state in which the lifting platform of the lifting device is in a ground contact position. FIG. [Diagram 5] 2 is a side view of a main portion of the work vehicle according to the embodiment, showing a state in which the lift platform of the lift device is in a ceiling position. FIG. [Figure 6] 2 is a rear view of the guide device of the work vehicle according to the embodiment. FIG. [Figure 7] FIG. 7 is a view taken along the arrow A in FIG. 6. [Figure 8] FIG. 7 is a view taken along the arrow B in FIG. 6. [Figure 9] 4 is a side view of a main portion showing a ladder engaging portion provided on a lifting platform of a lifting device in the work vehicle according to this embodiment. FIG. [Figure 10] 1 is a side view of a main portion of the work vehicle according to this embodiment, showing a state in which the platform is in a grounded position and a ladder is placed on the platform for storage. FIG. [Figure 11] 11 is an enlarged side view of a main portion showing the vicinity of the guide device in FIG. 10. [Figure 12] 11 is a side view of the main part showing a state in which the lift platform is slightly raised from the state shown in FIG. 10. [Figure 13] 13 is an enlarged side view of a main portion showing the vicinity of the guide device in FIG. 12. [Figure 14] 13 is a side view of the main part showing a state in which the lift platform is slightly raised from the state shown in FIG. 12. [Figure 15] 15 is an enlarged side view of a main portion showing the vicinity of the guide device in FIG. 14. [Figure 16] 15 is a side view of the main part showing a state in which the lift platform has been raised to a ceiling position from the state shown in FIG. 14. [Figure 17] 17 is an enlarged side view showing a main part in the vicinity of the guide device in FIG. 16. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0021] Fig. 1 is a side view of a work vehicle 1 according to one embodiment of the present invention. Fig. 2 is a side view showing the movement of a lifting platform 51 of a lifting device 5 in the work vehicle 1 according to this embodiment. Fig. 3 is a rear view of the work vehicle 1 according to this embodiment.

[0022] The work vehicle 1 of this embodiment is used as a rescue vehicle for rescue teams at the scene of an accident or disaster. As shown in Figs. 1 to 3, the work vehicle 1 is equipped with a cab 3, a cargo box 4, a lifting device 5, and a guide device 6. The cab 3 is provided at the front of the chassis 2. The cargo box 4 is provided behind the cab 3 on the chassis 2. Various materials and equipment for carrying out rescue operations are loaded inside the cargo box 4. Also, a seating space is provided inside the cargo box 4 for workers such as rescue team members to sit in.

[0023] A side door 47 is provided on the side of the packing box 4. A double-door type rear door 41 is provided on the rear of the packing box 4. These side doors 47 and rear door 41 are used for workers to enter and exit and for loading and unloading materials and equipment. The upper surface of the ceiling wall 42 of the packing box 4 is a space for loading large items with a long overall length, such as a boat (not shown) or a ladder 8. In this way, the work vehicle 1 moves with the items loaded on the upper surface of the ceiling wall 42 of the packing box 4. In order to make the vehicle appearance as neat as possible during movement, a side cover 44 is erected on the periphery of the ceiling wall 42. In addition, a plurality of positional deviation control members 45 are also provided so that the items on the upper surface of the ceiling wall 42 do not fall due to acceleration and deceleration during movement. A ladder storage bed section 46 is provided on the upper surface of the ceiling wall 42 for loading the ladder 8 and storing it in a stored state. The ladder storage bed section 46 is fixed to the upper surface of the ceiling wall 42 of the packing box 4. The ladder 8 is stored on the packing box 4 and transported by the work vehicle 1. The ladder 8 is lowered from the work vehicle 1 by a worker using the lifting device 5 and used at the work site.

[0024] The lifting device 5 is provided at the rear of the packing box 4. The lifting device 5 is provided with a lifting platform 51 that can be raised and lowered along the rear end of the packing box 4. The lifting platform 51 is formed to be large enough to lift and lower not only the equipment and materials to be stored inside the packing box 4 but also large transported objects such as boats and ladders 8. As shown in FIG. 2, the lifting platform 51 is configured to be able to be raised and lowered to match three different height positions: a ground position H1 where the platform is grounded on the ground G, a packing box floor position H2 where the platform is at the height of the floor of the packing box 4, and a ceiling position H3 where the platform is at the height of the ceiling wall 42. The lifting platform 51 can be in two states: an upright state as shown in FIG. 1 and FIG. 3, and a horizontal state as shown in FIG. 2. When the lifting platform 51 is in the upright state, the lifting platform 51 can be completely stored inside the packing box 4. When the lifting platform 51 is stored inside the packing box 4 by setting the lifting platform 51 in the upright state, the rear door 41 can be closed.

[0025] The guide device 6 is used for loading and unloading the ladder 8 between the ground G and the ladder storage bed section 46 on the cargo box 4. The guide device 6 is provided at the rear end of the upper surface of the ceiling wall 42. As shown in Fig. 3, there are two guide devices 6, a first guide device 6A and a second guide device 6B. In this embodiment, the first guide device 6A and the second guide device 6B are provided on the ceiling wall 42, biased to the left side with respect to the center in the vehicle width direction.

[0026] FIG. 4 is a side view of the main part of the work vehicle 1 according to this embodiment, showing a state in which the lifting platform 51 of the lifting device 5 is at the ground position H1. FIG. 5 is a side view of the main part of the work vehicle 1 according to this embodiment, showing a state in which the lifting platform 51 of the lifting device 5 is at the ceiling position H3. As shown in FIGS. 2, 4 and 5, the lifting device 5 includes a pair of left and right support members 52, 52 that support the lifting platform 51 so as to be rotatable up and down, a pair of left and right slide rails 53, 53 that guide the support members 52, 52 so as to be liftable and lowerable, and a pair of left and right power transmission mechanisms 55, 55 that transmit a driving force for lifting or rotating to the support members 52, 52. The support members 52, the slide rails 53 and the power transmission mechanism 55 are provided at the rear end of the cargo box 4 and near the inner surfaces of both left and right side walls of the cargo box 4.

[0027] The support member 52 is a plate-like member extending in the vertical direction. A plurality of connecting rollers 52a are attached to the outer surface of the packing box 4 of the support member 52 in the vertical direction. The base end of the lifting platform 51 is rotatably attached to the lower end of the support member 52. The lifting platform 51 and the support member 52 are also connected by a horizontal holding member 54. One end of the horizontal holding member 54 is connected to the upper end of the support member 52, and the lower end is connected to the tip of the lifting platform 51. The horizontal holding member 54 has two link members and is configured to be foldable around the central connecting point. The horizontal holding member 54 maintains the horizontal state of the lifting platform 51 by restricting the tip of the lifting platform 51 from rotating downward from the horizontal state when the lifting platform 51 is in the horizontal state.

[0028] The slide rail 53 has a lower slide member 531, the lower end of which is fixed to the lower part of the packing box 4, an intermediate slide member 532 which can be raised and lowered relative to the lower slide member 531, and an upper slide member 533 which can be raised and lowered relative to the lower slide member 531 and the intermediate slide member 532. The lower slide member 531 and the upper slide member 533 are formed in a plate shape which is elongated in the vertical direction and has an I-shaped cross section. The intermediate slide member 532 has an H-shaped cross section and is formed to the same length as the lower slide member 531 and the upper slide member 533. The upper slide member 533 is fitted in a recessed portion formed on the inner surface of the packing box 4 of the intermediate slide member 532 so as to be slidable up and down. The height position of the upper slide member 533 where its lower end meets the lower end of the intermediate slide member 532 is set as the lower limit position relative to the intermediate slide member 532. The lower slide member 531 is fitted in a recessed portion formed on the outer surface of the packing box 4 of the intermediate slide member 532 so as to be slidable up and down. The height position at which the upper end of the lower slide member 531 meets the upper end of the intermediate slide member 532 is set as the upper limit position for the lower slide member 531 relative to the intermediate slide member 532 .

[0029] A ground guide portion 534 is provided on the surface of the upper slide member 533 facing the inside of the packing box 4. This ground guide portion 534 connects to the support member 52 at the connecting roller 52a, and allows the support member 52 to slide up and down relative to the upper slide member 533. The ground guide portion 534 is configured so that the height position at which the upper end of the support member 52 matches the upper end of the upper slide member 533 is the upper limit position of the support member 52 relative to the upper slide member 533.

[0030] 4, the slide rail 53 is in a fully contracted state. In the fully contracted state of the slide rail 53, the lower slide member 531, the intermediate slide member 532 and the upper slide member 533 are overlapped so that the height positions of their upper ends and lower ends match. In the fully contracted state of the slide rail 53, the support member 52 is in a lowered state relative to the upper slide member 533 of the slide rail 53 in the fully contracted state.

[0031] 5, the slide rails 53 are in a fully extended state. In this state, the upper part of the lower slide member 531 overlaps with the lower part of the intermediate slide member 532, and the upper part of the intermediate slide member 532 overlaps with the lower part of the upper slide member 533. When the lift platform 51 is in the ceiling position H3, the support member 52 is at its upper limit position relative to the upper slide member 533.

[0032] The power transmission mechanism 55 includes a rotating cylinder 551, a lifting cylinder 552, a rotor 554 made of a sprocket, and a winding transmission body 555 made of a chain. The rotating cylinder 551 is connected to the upper end of the support member 52 and the tip of the lifting platform 51. The rotating cylinder 551 provides the lifting platform 51 with a driving force for rotating it in the up and down direction relative to the support member 52. The lifting cylinder 552 includes a cylinder tube 552a fixed to the inner side wall of the packing box 4 along the extension and contraction direction of the slide rail 53, and a cylinder rod 552b that can be raised and lowered relative to the cylinder tube 552a. The lifting cylinder 552 is disposed on the vehicle front side relative to the slide rail 53.

[0033] Rotating body 554 made of a sprocket is attached to the tip of cylinder rod 552b via mounting member 553. Mounting member 553 is a U-shaped member and supports both ends of the rotating shaft of rotating body 554. Mounting member 553 supports rotating body 554 for free rotation around a horizontal axis (around an axis in the vehicle width direction).

[0034] A wrapped power transmission body 555 made of a chain is wound around a rotating body 554. One end of the wrapped power transmission body 555 is attached to the lower end of the support member 52. The other end of the wrapped power transmission body 555 is fixed to the fixed part 48 of the packing box 4. The fixed part 48 is provided at the upper end of the cylinder tube 552a. The fixed part 48 is located on the vehicle front side relative to the rotating body 554. The wrapped power transmission body 555 extends upward from the fixed part 48 and is folded back by being wound around the rotating body 554. The wrapped power transmission body 555 extends downward from the rotating body 554 and is connected to the lower end of the support member 52.

[0035] As shown in Figures 2 and 3, a pair of ceiling covers 43, 43 are provided on the ceiling wall 42 of the packing box 4. Each ceiling cover 43 opens and closes a rectangular opening provided in the ceiling wall 42 so as to be in a position facing the lifting cylinder 552 and the slide rail 53. The ceiling cover 43 has a hinge portion at the edge of the opening on the front side of the vehicle. The ceiling cover 43 is vertically rotatable around this hinge portion.

[0036] As shown in FIG. 2 and FIG. 5, when the lift platform 51 is at the ceiling position H3, the rotor 554 at the tip of the cylinder rod 552b is located above the ceiling wall 42 of the packing box 4. Therefore, the ceiling cover 43 is configured to open so that the rotor 554 does not interfere with the ceiling wall 42 as the lift platform 51 rises. The driving force for opening and closing the ceiling cover 43 is the driving force of the lift cylinder 552. Specifically, the push-up roller unit 56 is attached to the mounting member 553 that rotatably supports the rotor 554. The push-up roller unit 56 is arranged to extend above and to the side of the rotor 554. The push-up roller unit 56 has a plurality of rollers 56a. When the lifting cylinder 552 is extended and the rotating body 554 moves upward, the roller 56a contacts the ceiling cover 43 from the inside before the rotating body 554 interferes with the ceiling cover 43, and the roller 56a pushes up the ceiling cover 43.

[0037] FIG. 6 is a rear view of the guide device 6 of the work vehicle 1 according to this embodiment. FIG. 7 is a view seen from the arrow A in FIG. 6. FIG. 8 is a view seen from the arrow B in FIG. 6. The guide device 6 in FIGS. 6 to 8 shows the first guide device 6A of the pair of left and right guide devices, a first guide device 6A and a second guide device 6B. The second guide device 6B has the same structure as the first guide device 6A, but has a shape obtained by left-right inverting the first guide device 6A. The detailed structure of the guide device 6 will be described with reference to FIGS. 6 to 8.

[0038] The guide device 6 includes a guide roller 60 that is rotatable about an axis in the vehicle width direction. The guide roller 60 is configured to be able to transfer the ladder 8 between the ladder storage bed section 46 and the lifting platform 51 while guiding the ladder 8 when the lifting platform 51 is raised to a predetermined height, i.e., when the lifting platform 51 is raised to the ceiling position H3. The guide roller 60 is also configured to be able to come into contact with the upper end of the ladder 8 when the lifting platform 51 is lowered to the ground position H1 and the lower end of the ladder 8 is placed on the lifting platform 51.

[0039] The guide roller 60 has a first guide roller 61 and a second guide roller 62. The guide device 6 also has a fixed bracket 63 to which the first guide roller 61 is attached, a movable bracket 64 to which the second guide roller 62 is attached, a hinge 67, and a biasing member 69.

[0040] The first guide roller 61 has a roller body 611, a bearing 613, and a rotation center shaft 612. The roller body 611 is made of, for example, rubber, and is formed in a stepped cylindrical shape. A small flange portion 611b that protrudes radially outward from the center portion is provided at the end portion on the inner side in the vehicle width direction of the roller body 611. A large flange portion 611a that protrudes radially outward from the small flange portion 611b is provided at the end portion on the outer side in the vehicle width direction of the roller body 611. The roller body 611 has a stepped hole portion 611c at the center. A metallic rotation center shaft 612 is disposed to pass through this stepped hole portion 611c. A bearing 613 is fitted between the wall surface that forms the stepped hole portion 611c and the rotation center shaft 612. This allows the roller body 611 to rotate smoothly around the rotation center shaft 612, with the rotation center shaft 612 as the center of rotation.

[0041] The fixed bracket 63 is attached to the rear end of the upper surface of the ceiling wall 42 of the packing box 4. The fixed bracket 63 rotatably supports the first guide roller 61 so that the height position of the rotation center axis 612 relative to the packing box 4 is fixed slightly above the upper surface of the ceiling wall 42. The fixed bracket 63 is mainly made of metal and has a fixed base portion 631, an outer support portion 632, an inner support portion 633, a connecting base portion 634, and a stopper portion 635. The fixed base portion 631 is formed in a rectangular flat plate shape and has a plurality of mounting holes 631a. The fixed base portion 631 is a portion that abuts against the upper surface of the ceiling wall 42 of the packing box 4. The fixed base portion 631 is fixed to the ceiling wall 42 by a fastening member using the mounting holes 631a.

[0042] The outer support portion 632 is erected at the end of the fixed base portion 631 on the outer side in the vehicle width direction. The outer support portion 632 has a vertical portion 632a, an inclined portion 632d connected to the upper end of the vertical portion 632a, a reinforcing rib portion 632b, and a support hole portion 632c. The vertical portion 633a is in the form of a strip extending upward. The inclined portion 632d is in the form of a plate, and is provided so as to incline toward the outer side in the vehicle width direction as it goes upward. A pair of reinforcing rib portions 632b are attached to the outer surface of the vertical portion 632a in the vehicle width direction so as to extend in the up-down direction. The support hole portion 632c is provided at a position between the pair of reinforcing rib portions 632b, 632b in the vertical portion 632a. The inner support portion 633 is erected at the end of the fixed base portion 631 on the inner side in the vehicle width direction. The inner support portion 633 has a vertical portion 633a, a reinforcing rib portion 633b, and a support hole portion 633c. The vertical portion 633a is a strip-shaped plate extending upward. A pair of reinforcing rib portions 633b are attached to the inner surface of the vertical portion 633a in the vehicle width direction so as to extend in the up-down direction. The support hole portion 633c is provided at a position between the pair of reinforcing rib portions 633b, 633b in the vertical portion 633a.

[0043] An end of the rotation center shaft 612 of the first guide roller 61 is inserted into the support hole 632c of the outer support portion 632 and the support hole 633c of the inner support portion 633. As a result, the outer support portion 632 and the inner support portion 633 support the first guide roller 61. A spacer 65 and a stop ring 66 are attached to the end of the rotation center shaft 612. This prevents the first guide roller 61 from coming off the fixed bracket 63. The roller body 611 of the first guide roller 61 protrudes in the front-rear direction beyond the outer support portion 632 and the inner support portion 633. In addition, the upper end of the roller body 611 protrudes upward beyond the upper end of the inner support portion 633. On the other hand, the upper end of the roller body 611 is located below the upper end of the outer support portion 632 (below the inclined portion 632d). The connecting base portion 634 is formed in a plate shape, and its ends in the vehicle width direction are supported by the outer support portion 632 and the inner support portion 633.

[0044] The connecting base portion 634 is disposed at a height position between the lower end of the first guide roller 61 supported by the outer support portion 632 and the inner support portion 633 and the fixed base portion 631. The fixed base portion 631, the outer support portion 632, the inner support portion 633 and the connecting base portion 634 are made of metal, and each portion is connected by welding or the like. The stopper portion 635 is made of rubber, for example, and is formed in a long and thin plate shape. The longitudinal ends of the stopper portion 635 are attached to the rear surfaces of the outer support portion 632 and the inner support portion 633. The stopper portion 635 is disposed below the height position of the connecting base portion 634.

[0045] The second guide roller 62 has a roller body 621, a bearing 623, and a rotation center shaft 622. The roller body 621 is made of, for example, rubber, and is formed in a cylindrical shape. The outer diameter of the roller body 621 is formed to be smaller than the outer diameter of the roller body 611 of the first guide roller 61. The roller body 621 has a stepped hole portion 621a at the center. A metallic rotation center shaft 622 is disposed to pass through the stepped hole portion 621a. A bearing 623 is fitted between the wall surface forming the stepped hole portion 621a and the rotation center shaft 622. This allows the roller body 621 to rotate smoothly around the rotation center shaft 622, with the rotation center shaft 622 as the center of rotation.

[0046] The movable bracket 64 is made of metal, and has an outer support portion 641 on the outer side in the vehicle width direction, an inner support portion 642 on the inner side in the vehicle width direction, and a connecting base portion 643. The outer support portion 641 is formed in a plate shape. A support hole portion 641a is formed in the lower portion of the outer support portion 641. A mountain-shaped upward protrusion portion 641b is formed in the upper portion of the outer support portion 641. The inner support portion 642 is formed in a plate shape. A support hole portion 642a is formed in the lower portion of the inner support portion 642. The inner support portion 642 does not have a portion equivalent to the upward protrusion portion 641b of the outer support portion 641.

[0047] An end of the rotation center shaft 622 of the second guide roller 62 is inserted into the support hole 641a of the outer support part 641 and the support hole 642a of the inner support part 642. In this way, the outer support part 641 and the inner support part 642 support the second guide roller 62. A spacer 65 and a stop ring 66 are attached to the end of the rotation center shaft 622. This prevents the second guide roller 62 from coming off the movable bracket 64. The roller body 621 of the second guide roller 62 protrudes rearward and downward beyond the outer support part 641 and the inner support part 642.

[0048] The connecting base portion 643 is formed in a plate shape, and its vehicle width direction end portion is supported by the outer support portion 641 and the inner support portion 642. The connecting base portion 643 is disposed above the second guide roller 62 supported by the outer support portion 641 and the inner support portion 642, at a height position of the upper end portion of the inner support portion 642. The upward protruding portion 641b of the outer support portion 641 is formed at a height position higher than the height position of the connecting base portion 643. The connecting base portion 643 has a horizontal portion 643a, a vertical portion 643b, and an inclined portion 643c. The vertical portion 643b is connected to the horizontal portion 643a so as to hang down from the front end of the horizontal portion 643a. The vertical portion 643b is disposed along the front surface of the outer support portion 641 and the inner support portion 642. The inclined portion 643c is connected to the horizontal portion 643a so as to incline downward from the rear end of the horizontal portion 643a toward the rear. The rear end of the inclined portion 643c is located between the rotation center of the second guide roller 62 and the rear end of the second guide roller 62. The outer support portion 641, the inner support portion 642, and the connecting base portion 643 are connected by welding or the like.

[0049] The hinge 67 is attached to the connection base portion 634 of the fixed bracket 63 and the connection base portion 643 (horizontal portion 643a) of the movable bracket 64 by a fastening member 68. The hinge 67 has a hinge shaft 67a extending in the vehicle width direction. The hinge 67 connects the movable bracket 64 to the fixed bracket 63 so as to be freely rotatable up and down. The hinge 67 makes the height position of the rotation center shaft 622 of the second guide roller 62 variable behind and below the first guide roller 61. When the movable bracket 64 is rotated downward relative to the fixed bracket 63, the downward rotation limit position is a position where the vertical portion 643b of the movable bracket 64 abuts against the stopper portion 635 of the fixed bracket 63. FIGS. 7 and 8 show a state in which the movable bracket 64 is rotated to the lower limit position relative to the fixed bracket 63. When the movable bracket 64 is rotated upward relative to the fixed bracket 63 , the upper rotation limit position is a position where the upper protrusion 641 b of the movable bracket 64 abuts against the outer support portion 632 of the fixed bracket 63 .

[0050] The biasing member 69 is made of a coil spring and is attached to the hinge shaft 67a. The biasing member 69 constantly biases the movable bracket 64 downward with respect to the fixed bracket 63.

[0051] FIG. 9 is a side view of the main part showing the ladder locking part 7 provided on the lifting platform 51 of the lifting device 5 in the work vehicle 1 according to this embodiment. As shown in FIG. 9, the lifting platform 51 is provided with the ladder locking part 7 for preventing the lower end of the ladder 8 from leaving the upper surface of the lifting platform 51 when loading and unloading the ladder 8. That is, the ladder locking part 7 locks the lower end of the ladder 8 placed on the lifting platform 51 when the lifting platform 51 is raised and lowered to load and unload the ladder 8 between the ground G and the ladder storage bed part 46 on the cargo box 4. In addition, when the ladder 8 is lowered from the lifting platform 51 to the ground G, the ladder locking part 7 releases the lock on the ladder 8. The locking and release of the lower end of the ladder 8 to the ladder locking part 7 are performed by the worker.

[0052] The ladder locking portion 7 has a locking member 71 that has an L-shaped cross section and extends in the vehicle width direction, and a storage recess 72 that stores the locking member 71 when the locking member 71 is not in use. The locking member 71 is attached to the lift platform 51 so that the base end can rotate up and down around an axis extending in the vehicle width direction. In the stored state, the locking member 71 is stored in the storage recess 72 so that it is approximately flush with the upper surface of the lift platform 51. In the used state, the locking member 71 rotates 90° upward and stands up. The locking member 71 has an upper surface portion 71a that becomes the upper surface in the stored state (two-dot chain line in FIG. 9) and a side surface portion 71b that hangs down from the tip of the upper surface portion 71a in the stored state. When the locking member 71 is in use (solid line in FIG. 9), the side surface portion 71b protrudes from the upper surface portion 71a toward the cargo box 4 side (the front side of the vehicle). In this state of use, the side surface portion 71b prevents the anti-slip member 82 at the lower end of the ladder 8 from moving upwardly away from the upper surface of the platform 51.

[0053] FIG. 10 is a side view of the main part showing the state where the lift platform 51 is placed on the lift platform 51 for storage with the lift platform 51 at the ground position H1 in the work vehicle 1 according to this embodiment. FIG. 11 is an enlarged side view of the main part showing the vicinity of the guide device 6 in FIG. 10. FIG. 12 is a side view of the main part showing the state where the lift platform 51 is slightly raised from the state of FIG. 10. FIG. 13 is an enlarged side view of the main part showing the vicinity of the guide device 6 in FIG. 12. FIG. 14 is a side view of the main part showing the state where the lift platform 51 is slightly raised from the state of FIG. 12. FIG. 15 is an enlarged side view of the main part showing the vicinity of the guide device 6 in FIG. 14. FIG. 16 is a side view of the main part showing the state where the lift platform 51 is raised to the ceiling position H3 from the state of FIG. 14. FIG. 17 is an enlarged side view of the main part showing the vicinity of the guide device 6 in FIG. 16. Hereinafter, the loading operation of the ladder 8 in the work vehicle 1 according to this embodiment will be described with reference to Fig. 10 to Fig. 17 (the unloading operation of the ladder 8 is performed by performing the operations reverse to those of the loading operation). In Fig. 10 to Fig. 17, the worker stands on the lifting platform 51 of the lifting device 5 to perform the work.

[0054] First, before the state shown in Figs. 10 and 11 is reached, the locking member 71 of the ladder locking portion 7 is changed from the stored state to the use state. The ladder 8 has a pair of posts 81, 81, a non-slip member 82 provided at the lower end, and a tip placement portion 83 provided at the upper end. In the state shown in Figs. 10 and 11, the ladder 8 is placed on the lifting platform 51 by an operator so that the non-slip member 82 is just caught on the locking member 71. The upper end of the ladder 8 is leaned against a pair of second guide rollers 62, 62 of a pair of guide devices 6, 6 (first guide device 6A and second guide device 6B) in the vehicle width direction so as to abut against the pair of second guide rollers 62, 62 in the vehicle width direction. More specifically, the pair of second guide rollers 62, 62 are abutted against the lower surfaces of the two posts 81, 81 extending in the vertical direction of the ladder 8. The distance between the pair of second guide rollers 62, 62 in the vehicle width direction is adjusted to the width of the ladder 8, so that the upper end of the ladder 8 fits between the upper protrusion 641b of the left movable bracket 64 and the upper protrusion 641b of the right movable bracket 64. The left upper protrusion 641b and the right upper protrusion 641b prevent the ladder 8 from shifting in the vehicle width direction. In Figs. 10 and 11, the pair of second guide rollers 62, 62 protrude rearward from the rear end of the packing box 4. The second guide rollers 62, 62 are located below the upper surface of the ceiling wall 42 of the packing box 4. The ladder 8 is not high enough to lean against the first guide roller 61, but is stably supported by the pair of second guide rollers 62, 62.

[0055] Next, in the state of Figs. 12 and 13, the lifting platform 51 is slightly raised from the grounding position H1 of Figs. 10 and 11. In this state, the upper end of the ladder 8 moves sufficiently above the grounding position H1 as the lifting platform 51 rises. Therefore, the lower surfaces of the pair of posts 81, 81 of the ladder 8 abut against the pair of first guide rollers 61, 61, and the first guide rollers 61, 61 roll. Also, in this state, the ladder 8 is accommodated between the pair of outer support parts 632, 632 of the pair of fixed brackets 63, 63 in the vehicle width direction. The pair of outer support parts 632, 632 restrict the ladder 8 from shifting in the vehicle width direction. In this state, the movable bracket 64 is freely rotatable up and down, but is biased downward, so that it maintains its original position (the position of Figs. 11 and 12). Therefore, the lower surfaces of the posts 81, 81 of the ladder 8 are upwardly separated from the second guide rollers 62, 62.

[0056] 14 and 15, the lift platform 51 rises further from the state shown in Fig. 12 and 13, and the inclination angle of the ladder 8 relative to the ceiling wall 42 of the packing box 4 decreases. The movable bracket 64 does not rotate upward and maintains its original position (the position shown in Fig. 11 and 12), so the distance between the lower surfaces of the posts 81, 81 of the ladder 8 and the second guide rollers 62, 62 increases further.

[0057] 16 and 17, the lifting platform 51 is at the ceiling position H3, and the inclination angle of the ladder 8 relative to the ceiling wall 42 of the packing box 4 is at a minimum. In this state, the distance from the lower end (rear end) of the ladder 8 to the first guide rollers 61, 61 is in a range of about 40% to 50% of the distance from the lower end (rear end) to the upper end (front end) of the ladder 8. Therefore, while the ladder 8 is raised from the ground position H1 of the lifting platform 51 to the ceiling position H3, the center of gravity position of the ladder 8 in the vertical direction (front-rear direction) does not move too far forward from the first guide roller 61 of the fulcrum, and the ladder 8 can be raised stably to the end. The worker removes the lower end (anti-slip member 82) of the ladder 8, which is locked by the locking member 71, from the locking member 71, moves the ladder 8 toward the front of the vehicle while sliding it on the first guide rollers 61, 61, and places the ladder 8 on the ladder storage bed section 46 provided on the ceiling wall 42 of the cargo box 4. At this time, the ladder 8 can be easily moved toward the front of the vehicle by using the first guide rollers 61, 61.

[0058] In the state shown in Figs. 16 and 17, the upper surface of the ceiling wall 42 of the packing box 4 and the upper surface of the lifting platform 51 are approximately flush with each other. In this state, the pair of second guide rollers 62, 62 and the movable brackets 64, 64 are pushed upward by the upper surface of the lifting platform 51. Since the movable brackets 64, 64 supporting the second guide rollers 62, 62 are configured to be freely rotatable up and down, no overload is generated in the guide device 6. When the lifting platform 51 is raised from the ground position H1 to the ceiling position H3, the second guide rollers 62, 62 supported by the movable brackets 64, 64 near the ceiling position H3 come into contact with the upper surface of the lifting platform 51, and the movable brackets 64, 64 are smoothly rotated upward via the second guide rollers 62, 62.

[0059] As described above, the work vehicle 1 according to this embodiment includes the cargo box 4 provided on the chassis 2, the lifting device 5 provided at the rear of the cargo box 4 and having a lifting platform 51 that can be raised and lowered along the rear end of the cargo box 4, and the guide device 6 used for loading and unloading the ladder 8 between the ground G and the ladder storage bed section 46 on the cargo box 4. The guide device 6 includes a guide roller 60 provided at the rear end of the upper surface of the cargo box 4 and rotatable around the vehicle width axis. The guide roller 60 is configured to abut on the lower surface of the support column 81 in the vertical direction of the ladder 8 when the lower end of the ladder 8 is placed on the lifting platform 51, and to roll along the lower surface of the support column 81 as the lifting platform 51 rises and falls. The guide roller 60 is configured to transfer the ladder 8 between the ladder storage bed section 46 and the lifting platform 51 while guiding the ladder 8 when the lifting platform 51 is raised to a predetermined height position.

[0060] According to the above configuration, the guide device 6 used for loading and unloading the ladder 8 between the ground G and the ladder storage bed section 46 on the packing box 4 is provided at the rear end of the upper surface of the packing box 4. The main component of the guide device 6 is the guide roller 60 that abuts against the lower surface of the support 81 of the ladder 8. Therefore, the guide device 6 only needs to occupy a small space on the upper surface of the ceiling wall 42 of the packing box 4. The lower end of the ladder 8 is placed on the lifting platform 51 of the lifting device 5, and the ladder 8 is raised and lowered in accordance with the lifting and lowering of the lifting platform 51 along the rear end of the packing box 4, so that it is possible to avoid providing a lifting device for the ladder 8 on the packing box 4. The lifting device 5 can raise and lower the lifting platform 51 along the rear end of the packing box 4, so that the lifting device 5 can be used for both loading and unloading the ladder 8 to and from the ladder storage bed section 46 and loading and unloading materials and equipment to and from the inside of the packing box 4. This makes it possible to easily load and unload the ladder 8 between the ground G and the top of the cargo box 4 without providing a large-scale device on the cargo box 4 and without providing a dedicated large-scale lifting device.

[0061] In addition, the lower end of the ladder 8 and the lower surface of the support 81 of the ladder 8 are supported by the lifting platform 51 and the guide roller 60, and the guide roller 60 rolls along the lower surface of the support 81 as the lifting platform 51 rises and falls, so that the upper end of the ladder 8 can be moved smoothly forward (backward) relative to the guide roller 60 as the lifting platform 51 rises (falls). This allows the inclination angle of the ladder 8 relative to the ceiling wall 42 of the packing box 4 to be smoothly decreased (increased) as the lifting platform 51 rises (falls). This allows the ladder 8 to be loaded and unloaded without the upper end of the ladder 8 protruding significantly upward from the height position of the ceiling wall 42 of the packing box 4 as the lifting platform 51 rises and falls. In addition, the guide rollers 60 are configured to be able to guide the ladder 8 while transferring it between the ladder storage bed section 46 and the lifting platform 51 when the lifting platform 51 is raised to a predetermined height position. Therefore, while the guide rollers 60 support the weight of the ladder 8, rescue team members or other workers can smoothly transfer the ladder 8 with light force.

[0062] In the above embodiment, the lifting platform 51 is configured to be able to rise and fall to at least three different height positions: a ground position H1 where the lifting platform 51 is grounded on the ground G, a packing box floor surface position H2 where the packing box floor surface is at the height of the packing box 4, and a ceiling position H3 where the packing box ceiling wall 42 is at the height of the packing box 4. When the lifting platform 51 is raised to the ceiling position H3, the guide rollers 60 are configured to be able to transfer the ladder 8 between the ladder storage bed section 46 and the lifting platform 51 while guiding the ladder 8. When the lifting platform 51 is lowered to the ground position H1 and the lower end of the ladder 8 is placed on the lifting platform 51, the guide rollers 60 are configured to be able to come into contact with the upper end of the ladder 8.

[0063] According to the above configuration, the height position of the lifting platform 51 of the lifting device 5 is adjusted to the height position of the ceiling wall 42 of the packing box 4, and a worker such as a rescue team member can transfer the ladder 8 between the ladder storage bed section 46 and the lifting platform 51. This allows the worker to transfer the ladder 8 more easily since the difference in height between the ladder storage bed section 46 and the lifting platform 51 is small. In addition, the worker can load and unload the ladder 8 between the lifting platform 51 and the ground G by placing the lifting platform 51 in contact with the ground G. This allows the worker to load and unload the ladder 8 more easily since the difference in height between the lifting platform 51 and the ground G is small. In addition, when the lifting platform 51 is lowered to the ground position H1 and the lower end of the ladder 8 is placed on the lifting platform 51, the guide rollers 60 are configured to be able to come into contact with the upper end of the ladder 8, so that even if a worker places the ladder 8 after use against the lifting platform 51 and the guide rollers 60 at the ground position H1 to store it, and then immediately raises the lifting platform 51, the ladder 8 can be smoothly guided by the guide rollers 60. In addition, since the lifting platform 51 can be adjusted to the height position of the floor surface of the packing box 4, a worker can smoothly load and unload materials and equipment into the packing box 4.

[0064] In the above embodiment, the lift platform 51 is provided with a ladder locking portion 7 for preventing the lower end of the ladder 8 from leaving the upper surface of the lift platform 51 when the ladder 8 is loaded or unloaded.

[0065] According to the above configuration, even if the support point of the guide roller 60 for the ladder 8 is not located sufficiently forward of the vehicle with respect to the center of gravity of the ladder 8 in the front-rear direction, the lower end of the ladder 8 can be prevented from separating from the upper surface of the lifting platform 51. This allows the lifting and lowering speed of the lifting platform 51 and the lifting and lowering speed of the lower end (rear end) of the ladder 8 to match, allowing smooth loading and unloading of the ladder 8.

[0066] In the above embodiment, the guide roller 60 has a first guide roller 61 attached to a fixed bracket 63 so that the height position of the rotation center axis 612 relative to the packing box 4 is fixed, and a second guide roller 62 attached to a movable bracket 64 so that the height position of the rotation center axis 622 can be changed behind and below the first guide roller 61.

[0067] According to the above configuration, when the length from the lower end to the upper end of the ladder 8 is insufficient for the vertical distance between the lift platform 51 at the ground position H1 and the ceiling wall 42 of the packing box 4, the second guide roller 62, which is located behind and below the first guide roller 61, can support the lower surface of the upper end of the support 81 of the ladder 8, the lower end of which is placed on the lift platform 51 for loading, at a position below the first guide roller 61. In addition, the first guide roller 61 can support the ladder 8 before the ladder 8 hits the rear end of the packing box 4. In addition, when the ladder 8 is lowered from the stored state, even if the upper end of the ladder 8 tries to move below the height position of the first guide roller 61 while the lift platform 51 is descending from the ceiling position H3 to the ground position H1, the second guide roller 62 can support the upper end of the ladder 8 without hitting the rear end of the packing box 4. This allows for smooth loading and unloading by utilizing both the first guide roller 61 and the second guide roller 62, even for a ladder 8 that has a relatively short length from its bottom end to its top end.

[0068] In the above embodiment, the movable bracket 64 is connected to the fixed bracket 63 so as to be vertically rotatable, and is biased downward by the biasing member 69 .

[0069] According to the above configuration, the problem of interference between the movable bracket 64 supporting the second guide roller 62 and the lifting platform 51 can be solved. Specifically, the second guide roller 62, which is rearward and lower than the first guide roller 61, protrudes rearward from the rear end of the packing box 4, so that when the lifting platform 51 is raised from the ground position H1 to the ceiling position H3, the second guide roller 62 comes into contact with the upper surface of the lifting platform 51 near the ceiling position H3. However, since the movable bracket 64 supporting the second guide roller 62 is vertically rotatable, when the lifting platform 51 is further raised, the movable bracket 64 can be smoothly rotated upward via the second guide roller 62 by the upper surface of the lifting platform 51. This allows the lifting platform 51 to be smoothly raised to the ceiling position H3. In addition, by biasing the movable bracket 64 downward by a biasing member, rattling of the movable bracket 64 during vehicle travel can be suppressed. In addition, when storing the ladder 8 after use, the upper end of the ladder 8 can be reliably supported by the second guide roller 62 with the lower end of the ladder 8 placed on the lifting platform 51 at the ground contact position H1.

[0070] The embodiments disclosed herein are illustrative in all respects and are not intended to be limiting. The technical scope of the present invention is not interpreted solely by the above-described embodiments, but is defined by the claims. The technical scope of the present invention includes all modifications within the scope and meaning equivalent to the claims.

[0071] For example, in the above embodiment, there are two guide devices 6, a first guide device 6A and a second guide device 6B. The present invention is not limited to this, and may be configured with one guide device having a guide roller having a length equal to the distance between a pair of posts of the ladder. Also, in the above embodiment, the guide roller 60 of the guide device 6 includes a first guide roller 61 and a second guide roller 62. The present invention is not limited to this, and the guide device may have only one guide roller. [Explanation of symbols]

[0072] 1 Work vehicle 2 Chassis 4 packing boxes 5 Lifting device 6 Guide device 7 Ladder locking part 8 ladder 42 Ceiling Wall 46 Ladder storage bed section 51 Lift platform 60 Guide roller 61 First guide roller 62 Second guide roller 63 Fixing bracket 64 Movable bracket 69 Pressing member 81 Post 612 Rotational axis 622 Rotational axis G ground H1 Grounding position H2 Loading box floor position H3 Ceiling position

Claims

1. The vehicle is provided with a cargo box provided on a vehicle chassis, a lifting device provided at the rear of the cargo box and having a lifting platform that can be raised and lowered along the rear end of the cargo box, and a guide device used for loading and unloading a ladder between the ground and a ladder storage bed section above the cargo box, The guide device includes a guide roller that is provided at a rear end portion of an upper surface of the packing box and is rotatable about an axis in the vehicle width direction, The guide rollers are configured to abut against the lower surfaces of the vertical supports of the ladder when the lower end of the ladder is placed on the lifting platform, and are configured to roll along the lower surfaces of the supports as the lifting platform rises and falls. The guide roller is configured to be able to transfer the ladder between the ladder storage bed section and the lifting platform while guiding the ladder when the lifting platform is raised to a predetermined height position. A work vehicle characterized by:

2. The lifting platform is configured to be liftable to at least three height positions including a ground position where the lifting platform is grounded on the ground, a packing box floor position where the packing box floor position is at the height of the packing box floor, and a ceiling position where the packing box ceiling wall position is at the height of the packing box; When the lift platform is raised to the ceiling position, the guide rollers are configured to guide the ladder and transfer the ladder between the ladder storage bed section and the lift platform, When the lift platform is lowered to the ground position and the lower end of the ladder is placed on the lift platform, the guide roller is configured to be able to abut against the upper end of the ladder.

2. The work vehicle according to claim 1 .

3. The platform is provided with a ladder locking portion for preventing the lower end of the ladder from leaving the upper surface of the platform when loading and unloading the ladder.

3. The work vehicle according to claim 2.

4. The guide roller has a first guide roller attached to a fixed bracket so that the height position of the rotation center axis relative to the packing box is fixed, and a second guide roller attached to a movable bracket so that the height position of the rotation center axis is variable behind and below the first guide roller.

4. The work vehicle according to claim 3.

5. The movable bracket is connected to the fixed bracket so as to be vertically rotatable, and is biased downward by a biasing member.

5. The work vehicle according to claim 4.

Images