JP7702124B2 - Heavy-duty transport vehicle with tilting platform - Google Patents

Description

The present invention relates to a heavy-duty transport vehicle with a tilting platform that primarily carries heavy machinery.

A heavy-duty transport vehicle with a tilting platform can load and unload heavy equipment and other heavy objects by tilting the platform downward toward the rear end. This heavy-duty transport vehicle has a pair of running boards connected to the rear edge of the platform, and the heavy equipment can be driven via the running boards to be loaded and unloaded onto the platform. However, this heavy-duty transport vehicle has the drawback that it is difficult to safely load and unload the heavy equipment, as the heavy equipment is loaded and unloaded onto the platform by running on the running boards connected to the rear of the platform. The inventor has developed a heavy-duty transport vehicle that overcomes this drawback and allows heavy equipment and other heavy objects to be loaded and unloaded more safely (see Patent Document 1).

In this heavy-duty transport vehicle, the outriggers are used to position the vehicle so that it is inclined downwards towards the rear end, and in this state the platform is moved backwards so that the rear end comes into contact with or approaches the ground, allowing heavy machinery to load and unload directly onto the platform without having to travel along a pair of narrow running boards as in the past. In this heavy-duty transport vehicle, a pair of cylinders are arranged on both sides of the underside of the platform to move the platform back and forth. Furthermore, to protect the cylinders, a vertical tube is fixed to the underside of the platform and a cylinder is arranged inside this vertical tube. This heavy-duty transport vehicle transports heavy loads on the platform, so the platform deforms due to the load, and the deformed platform deforms the vertical tube, which in turn deforms the cylinder, causing the cylinder to be unable to move back and forth smoothly across the platform.

Japanese Utility Model Application Publication No. 6-53288

The present invention was developed with the aim of resolving the above-mentioned shortcomings, and one object of the present invention is to provide a heavy-duty transport vehicle with a tilting platform that can transport heavy loads such as heavy machinery on the platform and prevent deformation of the platform over long periods of time, allowing the platform to move smoothly back and forth.

Means for solving the problem and effects of the invention

A heavy-duty transport vehicle with a tilting platform according to one aspect of the present invention includes a platform connected to a vehicle chassis so as to be freely movable forward and backward, a pair of rails fixed to the chassis for moving the platform forward and backward, left and right wheels connected to the platform and running on the pair of rails for moving the platform forward and backward, a pair of cylinders connected at one end to the platform and extending and retracting themselves to move the platform forward and backward, a drive mechanism for synchronously moving the pair of cylinders forward and backward, and an outrigger for tilting the chassis. The platform has two rows of reinforcing members fixed to both sides of the underside in parallel positions extending in the longitudinal direction of the platform, the reinforcing members having rectangular cylindrical cover tubes with built-in cylinders, and the wheels connected to the reinforcing members via rotating shafts. The slide holder is further provided with a slide holder that is fixed to the chassis and supports the reinforcement from below, the slide holder having a slip plate on its upper surface that is disposed on the upper surface of the slide holder below the reinforcement, the slide holder supports at least the reinforcement that has moved rearward with the slip plate interposed between it and the reinforcement, and the reinforcement fixed to the loading platform slides back and forth on the slip plate of the slide holder.

The above-mentioned heavy-duty transport vehicles have the advantage that they can transport heavy loads such as heavy machinery on the loading platform while preventing deformation of the loading platform for long periods of time and allowing the loading platform to move smoothly back and forth. This is because the above-mentioned heavy-duty transport vehicles have two rows of reinforcing members fixed to both sides of the underside of the loading platform in parallel positions extending in the longitudinal direction of the loading platform, the reinforcing members have rectangular cylindrical cover tubes with built-in cylinders, the wheels are connected to the reinforcing members via rotating shafts, and the vehicle is equipped with slide holders fixed to the chassis to support the reinforcing members from below, and the reinforcing members fixed to the loading platform slide on the slip plate of the slide holder to move back and forth.

In the above-mentioned heavy-duty transport vehicle, a reinforcing material that reinforces the loading platform from the underside is used in combination with a cover tube that incorporates a cylinder, and the reinforcing material effectively reinforces the loading platform to prevent deformation, and deformation of the cylinder due to the cover tube can be prevented. In addition, by connecting wheels to the reinforcing material that incorporates a cylinder, the wheels can be positioned close to the cylinder and the wheels can support the reinforcing material. Furthermore, in the above-mentioned heavy-duty transport vehicle, the reinforcing material is supported from below by a slide holder fixed to the chassis, separate from the wheels connected to the reinforcing material. In this way, by supporting the reinforcing material with the slide holder, deformation of the cover tube can be prevented, and deformation of the cylinder due to the cover tube can be prevented. In addition, the slide holder can suppress vibration, shaking, deflection, distortion, tilt, etc. of the reinforcing material caused by the weight of the heavy object on the loading platform when loading and unloading heavy objects or when traveling for transportation. By supporting the reinforcing material with the slide holder and suppressing vibration, etc., the load on the wheels can be reduced, and strength and durability can be improved. Furthermore, by providing a slip plate on the top surface of the slide holder, the coefficient of friction between the slide holder and the reinforcement is smaller than if they were in direct metal-to-metal contact, allowing the reinforcement to slide smoothly on the slip plate. The wheels connected to the reinforcement run on rails fixed to the chassis, while the reinforcement slides on the slip plate, allowing the loading platform to move smoothly back and forth.

In addition to the above-mentioned embodiment, a heavy-duty transport vehicle with a tilting bed according to another aspect of the present invention may further include a slip plate that contains any one of resin, plastic, and rubber.
In addition to the above aspect, a heavy-duty transport vehicle with a tilting loading platform according to another aspect of the present invention has a slip plate made of a material with a smaller coefficient of friction than a direct metal-to-metal contact between the slide holder and the reinforcing material.
In addition to the above-mentioned aspect, a heavy-duty transport vehicle with a tilting bed according to another aspect of the present invention can have a connecting fitting that connects the cover tube to a tip of the rod of the cylinder.
In another aspect of the present invention, in addition to the above aspect, a heavy-duty transport vehicle with a tilting loading platform has a plurality of slide holders arranged therein, and a slip plate is interposed between the slide holders and the reinforcement material, so that at least one of the slide holders can support the reinforcement material within the range in which the reinforcement material moves back and forth.
A heavy-duty transport vehicle with a tilting loading platform according to another aspect of the present invention further includes an opposing plate fixed to the lower surface of the reinforcing member.

The above-mentioned heavy-duty transport vehicles can reinforce the underside of the reinforcing material with the opposing plate. In addition, it is possible to prevent the cover tube and the underside of the reinforcing material from directly contacting the slip plate, causing wear and reducing strength. Furthermore, by adjusting the material and thickness of the opposing plate, it is possible to adjust the strength and friction coefficient and improve durability. Furthermore, the above-mentioned heavy-duty transport vehicles also have the advantage that the height of the loading platform can be fine-tuned by adjusting the thickness of the opposing plate.

A heavy-duty transport vehicle with a tilting platform according to another aspect of the present invention further includes a side holder that is fixed to the chassis and extends from the chassis in the short direction of the platform, and supports the platform from below outside the reinforcement material.

In the above-mentioned heavy-duty transport vehicle, in addition to supporting the reinforcing material with the slide holder, the side holder fixed to the chassis supports the loading platform outside the reinforcing material, so that the loading platform can be supported more stably by both the slide holder and the side holder to prevent deformation of the loading platform, and the side holder can efficiently suppress vibration, swaying, bending, distortion, tilt, etc. of the loading platform.

A heavy-duty transport vehicle with a tilting platform according to another aspect of the present invention further includes a first reinforcing bar in which the reinforcing material is fixed to the upper or lower surface of the cover tube.

In the above-mentioned heavy-duty transport vehicle, in addition to supporting the reinforcing material with a slide holder, the cover tube is reinforced with a first reinforcing bar, so that the reinforcing material effectively reinforces the loading platform and prevents deformation, and the first reinforcing bar further reinforces the cover tube, preventing deformation of the cover tube and thus preventing deformation of the cylinder due to the cover tube.

A heavy-duty transport vehicle with a tiltable platform according to another aspect of the present invention includes a platform connected to the chassis of the vehicle so as to be freely movable forward and backward, a pair of rails fixed to the chassis for moving the platform forward and backward, left and right wheels connected to the platform and running on the pair of rails to move the platform forward and backward, a pair of cylinders connected at one end to the platform and extending and retracting to move the platform forward and backward, a drive mechanism for synchronously moving the pair of cylinders forward and backward, and an outrigger for tilting the chassis. The platform has two rows of reinforcing members fixed to both sides of the underside in a parallel position extending in the longitudinal direction of the platform, the reinforcing members having rectangular cylindrical cover tubes with built-in cylinders, and the wheels connected to the reinforcing members via a rotating shaft. Furthermore, the platform includes side holders fixed to the chassis and extending from the chassis in the lateral direction of the platform, and the side holders support the platform from below outside the reinforcing members.

The above-mentioned heavy-duty transport vehicles have the advantage that they can transport heavy loads such as heavy machinery on the loading platform while preventing deformation of the loading platform for long periods of time and allowing the loading platform to move back and forth smoothly. This is because the above-mentioned heavy-duty transport vehicles have two rows of reinforcing members fixed in parallel on both sides of the underside of the loading platform, extending in the longitudinal direction of the loading platform, the reinforcing members have rectangular tubular cover tubes with built-in cylinders, the wheels are connected to the reinforcing members via rotating shafts, and have side holders fixed to the chassis and extending from the chassis in the lateral direction of the loading platform, and the side holders support the loading platform from below, outside the reinforcing members.

In the above-mentioned heavy-duty transport vehicle, a reinforcing material that reinforces the loading platform from the bottom is used in combination with a cover tube that incorporates a cylinder, and the reinforcing material effectively reinforces the loading platform to prevent deformation, and deformation of the cylinder due to the cover tube can be prevented. In addition, by connecting wheels to the reinforcing material that incorporates a cylinder, the wheels can be positioned close to the cylinder and the reinforcing material can be supported by these wheels. Furthermore, in addition to the wheels connected to the reinforcing material, the above-mentioned heavy-duty transport vehicle supports the loading platform from below with side holders fixed to the chassis. In particular, since the side holders support the loading platform from below outside the reinforcing material, vibration, swaying, tilting, etc. of the loading platform can be efficiently suppressed. In addition, when a heavy-duty transport vehicle loaded with heavy goods is traveling, vibration and swaying become large due to various factors such as the load of the heavy goods, road surface conditions, repeated acceleration and stopping of the vehicle, and the suspension and engine of the vehicle itself. However, by arranging the side holders on both sides, both of which are positioned outside near the ends of the loading platform in the width direction, vibration and swaying of the loading platform can be more efficiently suppressed.

In another aspect of the present invention, a heavy-duty transport vehicle with a tilting loading platform has a side holder that includes a support frame with one end fixed to the chassis and the other end extending beyond the reinforcement, and a support base that is connected to the support frame and supports the loading platform from below, and the loading platform has a protruding plate portion that protrudes downward at a position opposite the support base, and the support base of the side holder supports the loading platform via the protruding plate portion to hold it in a fixed position.

In the above-mentioned heavy-duty transport vehicle, the support base of the side holder supports the loading platform from below via the protruding plate portion, so that the side holder can reliably support the loading platform at a predetermined position as the loading platform moves back and forth, and vibration and shaking of the loading platform can be suppressed at the position of the side holder.

In another aspect of the present invention, a heavy-duty transport vehicle with a tilting loading platform has multiple side holders spaced apart in the fore-aft direction, and the loading platform has multiple protruding plate portions spaced apart in the fore-aft direction, with the protruding plate portions positioned opposite each of the support platforms when the loading platform is moved all the way forward.

The above-mentioned heavy-duty transport vehicle has multiple protruding plate sections positioned so that when the loading platform is moved all the way forward, the protruding plate sections are positioned opposite the upper surface of each support platform of the side holder. Therefore, when the heavy-duty transport vehicle is traveling, multiple points on both sides of the loading platform are securely supported by the side frames via the protruding plate sections, allowing the vehicle to travel safely while effectively suppressing the vibration and swaying of the loading platform.

A heavy-duty transport vehicle with a tilting platform according to another aspect of the present invention further includes a first reinforcing bar in which the reinforcing material is fixed to the upper or lower surface of the cover tube.

In the above-mentioned heavy-duty transport vehicle, in addition to supporting the loading platform with side holders, the cover tube is reinforced with a first reinforcing bar, so that the reinforcing material effectively reinforces the loading platform and prevents deformation, and the first reinforcing bar further reinforces the cover tube, preventing deformation of the cover tube and thus preventing deformation of the cylinder due to the cover tube.

A heavy-duty transport vehicle with a tilting platform according to another aspect of the present invention includes a platform connected to a vehicle chassis so as to be freely movable forward and backward, a pair of rails fixed to the chassis for moving the platform forward and backward, left and right wheels connected to the platform and running on the pair of rails for moving the platform forward and backward, a pair of cylinders connected at one end to the platform and extending and retracting to move the platform forward and backward, a drive mechanism for synchronously moving the pair of cylinders forward and backward, and an outrigger for tilting the chassis. The platform has two rows of reinforcing members fixed to both sides of the underside in a parallel position extending in the longitudinal direction of the platform, and the reinforcing members include a rectangular cylindrical cover tube with a built-in cylinder and a first reinforcing bar fixed to the upper or lower surface of the cover tube, and the wheels are connected to the reinforcing members via a rotating shaft.

The above-mentioned heavy-duty transport vehicles have the advantage that they can transport heavy loads such as heavy machinery on the loading platform while preventing deformation of the loading platform for long periods of time and allowing the loading platform to move back and forth smoothly. This is because the above-mentioned heavy-duty transport vehicles have two rows of reinforcing members fixed in parallel to both sides of the underside of the loading platform and extending in the longitudinal direction of the loading platform, the reinforcing members comprise a rectangular tubular cover tube with a built-in cylinder and a first reinforcing bar fixed to the top or bottom of the cover tube, and the wheels are connected to the reinforcing members via a rotating shaft.

The above-mentioned heavy-duty transport vehicle uses a reinforcing material that reinforces the loading platform from the underside in combination with the cover tube that houses the cylinder, and further reinforces the cover tube with a first reinforcing bar and connects the wheels to the reinforcing material, so that the reinforcing material effectively reinforces the loading platform to prevent deformation, and the first reinforcing bar further reinforces the cover tube to prevent deformation of the cover tube, thereby preventing deformation of the cylinder due to the cover tube. As a result, the above-mentioned heavy-duty transport vehicle prevents deformation of the cylinder while transporting heavy objects for long periods of time, and also prevents contact between the cylinder and cover tube, achieving the characteristic that the loading platform can be smoothly reciprocated back and forth.

Furthermore, the above-mentioned heavy-duty transport vehicle has the feature that the height of the loading platform can be adjusted by the thickness of the first reinforcing bar while reinforcing the cover tube, since the first reinforcing bar is fixed to the upper or lower surface of the square cylindrical cover tube. The height of the loading platform directly affects the vehicle height. On the one hand, a heavy-duty transport vehicle with a lower loading platform has a lower center of gravity, making the vehicle more stable, and also making it easier and safer to load and unload the loaded vehicle. Furthermore, the maximum height of the loaded vehicle can be lowered, and height restrictions on expressways and general roads can be avoided. On the other hand, it is necessary to have sufficient strength to load and transport heavy objects, and it is also necessary to secure space so that interference such as contact between the loading platform and the rear wheels does not occur when the loading platform tilts and moves backward. In order to set the loading platform to the optimal height depending on the vehicle structure, the loaded vehicle, the required strength, and the purpose, the above-mentioned heavy-duty transport vehicle can adjust the height of the loading platform by the thickness and height of the first reinforcing bar, which realizes the feature that the loading platform can be set to the optimal height in various heavy-duty transport vehicles. The combined height of the cover tube and the first reinforcing bar allows the height of the horizontal frame and the diameter of the wheels to be adjusted, ensuring sufficient strength to support the loading platform while improving the running conditions of the wheels and allowing the loading platform to move smoothly back and forth.

In another aspect of the present invention, a heavy-duty transport vehicle with a tiltable loading platform has a reinforcing member that fixes a first reinforcing bar to the underside of the cover tube.

The above-mentioned heavy-duty transport vehicle can reinforce the underside of the reinforcing material with the first reinforcing bar. In addition, the cover tube can be fixed directly to the underside of the loading platform, and the cylinder can be positioned close to the underside of the loading platform, allowing the loading platform carrying heavy objects to be moved efficiently in the forward and backward directions by the cylinder, while the loading platform height can be set optimally.

In another aspect of the present invention, a heavy-duty transport vehicle with a tilting platform further includes a second reinforcing bar fixed to the sides of the cover tube and the first reinforcing bar, and the wheels are connected to the second reinforcing bar via a rotating shaft.

The above-mentioned heavy-duty transport vehicle has reinforcing members fixed to both sides of the underside of the loading platform in parallel positions extending in the longitudinal direction of the loading platform, and the reinforcing members are composed of a rectangular cover tube containing a cylinder, a first reinforcing bar fixed to the upper or lower surface of the cover tube, and a second reinforcing bar fixed to the side surfaces of the cover tube and the first reinforcing bar, and the rotation axis of the wheels that run on the rails is fixed to the second reinforcing bar. The above-mentioned heavy-duty transport vehicle uses the reinforcing member that reinforces the loading platform from the underside in combination with the cover tube containing the cylinder, and further reinforces the cover tube with the first and second reinforcing bars, and connects the wheels to the second reinforcing bar, so that the reinforcing member effectively reinforces the loading platform and prevents deformation, and the first and second reinforcing bars further reinforce the cover tube and prevent deformation of the cover tube, thereby preventing deformation of the cylinder due to the cover tube. As a result, the above-mentioned heavy-duty transport vehicle prevents deformation of the cylinder while transporting heavy loads for long periods of time, and also prevents contact between the cylinder and the cover tube, achieving the advantage of allowing the loading platform to move smoothly back and forth.

In another aspect of the present invention, a heavy-duty transport vehicle with a tilting platform has a first reinforcing bar that is rectangular and tubular, and is fixed in surface contact with the underside of the cover tube.

The above-mentioned heavy-duty transport vehicle has the advantage that the first reinforcing bar is cylindrical, allowing the loading platform to be reinforced while reducing the weight of the reinforcing material.

In another aspect of the present invention, a heavy-duty transport vehicle with a tilting platform has a first reinforcing bar made of a pair of channel steels with their opening edges welded together, and the pair of channel steels have reinforcing ribs that are bent inward along the opening edges, and the reinforcing ribs are arranged in a vertical plane and welded together in a surface contact state.

The above-mentioned heavy-duty transport vehicle improves the bending strength of the first reinforcing bar with the reinforcing ribs of the channel steel, thereby further improving the bending strength of the reinforcing material. This has the advantage that the reinforcing material reinforces the loading platform more effectively, minimizing deformation of the loading platform when heavy objects are loaded on it.

In another aspect of the present invention, a heavy-duty transport vehicle with a tilting platform has a first reinforcing bar made of two or more rectangular tubular members that are welded together in face-to-face contact.

The above-mentioned heavy-duty transport vehicle has a reinforcing surface that runs parallel to the longitudinal side of the square tube inside the square tube-shaped first reinforcing bar, and the two surfaces are welded together, improving the bending strength of the first reinforcing bar, allowing the reinforcing material to reinforce the loading platform more effectively, and minimizing deformation of the loading platform when heavy loads are loaded.

A heavy-duty transport vehicle with a tilting platform according to another aspect of the present invention has a winch located in front of the platform.

The above heavy-duty transport vehicles can lift heavy objects that cannot move on their own onto the loading platform using a wire that is wound up by a winch.

1 is a schematic side view of a heavy goods transport vehicle according to an embodiment of the present invention; FIG. 2 is a schematic plan view of the heavy goods transport vehicle shown in FIG. 1 . FIG. 2 is a schematic plan view of the heavy goods transport vehicle shown in FIG. 1 with the loading platform removed. 2 is a schematic cross-sectional view showing a state in which the heavy goods transport vehicle shown in FIG. 1 is tilted; 5 is a schematic cross-sectional view showing a state in which the platform of the heavy goods transport vehicle shown in FIG. 4 has been moved rearward. 6 is a vertical cross-sectional view of the heavy goods transport vehicle shown in FIG. 2 taken along line VI-VI. 3 is a vertical cross-sectional view of the heavy goods transport vehicle shown in FIG. 2 taken along line VII-VII. 8 is a vertical cross-sectional view showing the positional relationship between the loading platform and the side frame, which corresponds to the cross-section of the heavy goods transport vehicle shown in FIG. 2 taken along line VIII-VIII. FIG. 2 is a hydraulic circuit diagram showing an example of a drive mechanism. 1 is a schematic vertical sectional view showing a state in which a vertical load is applied to the upper surface of the platform of a heavy goods transport vehicle. FIG. 11 is a partially enlarged schematic vertical sectional view showing a reinforcement member for a heavy goods transport vehicle according to another embodiment of the present invention. FIG. 11 is a partially enlarged schematic vertical sectional view showing a reinforcement member for a heavy goods transport vehicle according to another embodiment of the present invention. FIG. 11 is a partially enlarged schematic vertical sectional view showing a reinforcement member for a heavy goods transport vehicle according to another embodiment of the present invention. FIG. 11 is a partially enlarged schematic vertical sectional view showing a reinforcement member for a heavy goods transport vehicle according to another embodiment of the present invention.

The present invention will be described in detail below with reference to the drawings. In the following description, terms indicating specific directions or positions (e.g., "upper", "lower", and other terms including these terms) are used as necessary, but the use of these terms is for the purpose of facilitating understanding of the invention with reference to the drawings, and the meaning of these terms does not limit the technical scope of the present invention. In addition, parts with the same reference numerals appearing in multiple drawings indicate the same or equivalent parts or members.
Furthermore, the embodiments shown below are specific examples of the technical ideas of the present invention, and do not limit the present invention to the following. Furthermore, unless otherwise specified, the dimensions, materials, shapes, relative positions, etc. of the components described below are intended to be illustrative and not to limit the scope of the present invention. Furthermore, the contents described in one embodiment or example can be applied to other embodiments or examples. Furthermore, the sizes and positional relationships of the components shown in the drawings may be exaggerated to clarify the explanation.

In this specification, heavy objects include, for example, passenger cars, trucks, as well as excavators, bulldozers, wheel loaders, cranes, tractors, and special vehicles. However, they are not limited to vehicles and heavy machinery, and broadly include heavy objects that can be loaded onto a platform and transported, such as objects loaded onto pallets or containers, regardless of whether they have wheels or caterpillar tracks, and whether they are self-propelled or not.

In this specification, the front and rear of the vehicle refer to the driver's seat side as the front side of the vehicle in the longitudinal direction of the vehicle, and the rear end side of the loading platform 1 on the opposite side as the rear side of the vehicle. Similarly, the front and rear of the loading platform 1 refer to the driver's seat side as the front side of the loading platform 1 in the longitudinal direction of the loading platform 1, and the rear end side of the loading platform 1 on the opposite side as the rear side of the loading platform 1. When indicating the vehicle and loading platform length and width, the longitudinal direction is referred to as vertical, and the short side direction is referred to as horizontal. The inside refers to the center line side of the short side of the loading platform 1, and the outside refers to the end side of the short side of the loading platform 1.

[Embodiment 1]
Figures 1 to 9 show a heavy goods transport vehicle 100 according to an embodiment of the present invention. Figure 1 is a schematic side view of the heavy goods transport vehicle 100, Figure 2 is a schematic plan view of the heavy goods transport vehicle 100, Figure 3 is a schematic plan view of the heavy goods transport vehicle 100 with the bed removed, Figure 4 is a schematic cross-sectional view showing the heavy goods transport vehicle 100 in Figure 1 with the vehicle tilted, Figure 5 is a schematic cross-sectional view showing the heavy goods transport vehicle 100 in Figure 4 with the bed 1 moved backward, Figure 6 is a vertical cross-sectional view taken along line VI-VI in Figure 2, Figure 7 is a vertical cross-sectional view taken along line VII-VII in Figure 2, Figure 8 is a vertical cross-sectional view taken along line VIII-VIII in Figure 2, and Figure 9 is a hydraulic circuit diagram showing the drive mechanism 20 of the heavy goods transport vehicle 100.

The heavy-duty transport vehicle 100 shown in these figures includes a loading platform 1 connected to the chassis 2 of the vehicle so as to be freely movable back and forth, a pair of rails 3 fixed to the chassis 2 to move the loading platform 1 back and forth, left and right wheels 4 connected to the loading platform 1 and running on the pair of rails 3 to move the loading platform 1 back and forth, a pair of cylinders 10 connected at one end to the loading platform 1 and extending and retracting themselves to move the loading platform 1 back and forth, a drive mechanism 20 that moves the pair of cylinders 10 back and forth in synchronization, and an outrigger 9 that tilts the chassis 7. The loading platform 1 has two rows of reinforcing members 5 fixed to both sides of the underside in a parallel position extending in the longitudinal direction of the loading platform 1, and the reinforcing members 5 include a rectangular cylindrical cover tube 5a that incorporates the cylinders 10, and the wheels 4 are connected to the reinforcing members 5 via a rotating shaft 8. Furthermore, the heavy-duty transport vehicle 100 includes a slide holder 7 fixed to the chassis 2 to support the reinforcing members 5 from below. The slide holder 7 has a slip plate 13 on its upper surface, and the reinforcement material 5 fixed to the loading platform 1 slides on the slip plate 13 of the slide holder 7 to move back and forth.

(Cargo platform 1)
1 to 5, the loading platform 1 is disposed behind a cabin 19 in which a driver's seat is located, and has a generally rectangular shape that is elongated in the front-to-rear direction of the vehicle in a plan view. The heavy-duty transport vehicle 100 travels with a heavy object loaded on the loading platform 1 to transport the heavy object. The loading platform 1 is connected to a chassis 2 of the vehicle so as to be freely movable forward and backward.

As shown in FIG. 4, the heavy-duty transport vehicle 100 tilts the platform 1 by lifting the front of the chassis 2 with the outriggers 9. Furthermore, as shown in FIG. 5, the platform 1 moves backward, allowing heavy objects to be easily loaded and unloaded. By moving the platform 1 backward with the front of the chassis 2 lifted, or by lifting the front of the chassis 2 with the platform 1 moved backward, the rear end of the platform 1 can be brought into contact with or close to the ground, allowing heavy objects such as heavy machinery to be easily loaded and unloaded. This structure allows heavy objects such as heavy machinery to be loaded and unloaded directly onto the platform 1 without having to run over a pair of narrow running boards as in the past. Moreover, compared to a vehicle with running boards at the rear end of the platform 1, the platform 1 itself is tilted and moved to the ground, making it easier to load and unload heavy objects. In particular, loading and unloading broken-down vehicles that cannot move on their own is extremely easy compared to running boards. The heavy-duty transport vehicle 100 shown in the figure does not have a rung at the rear end of the platform 1, but a rung may be provided at the rear end of the platform 1 to eliminate the step between the platform 1 and the ground. For example, the rung can be provided across almost the entire width of the platform 1, or partially, to smoothly bridge the top surface of the rear end of the platform 1 close to the ground and the ground surface.

In a heavy-duty transport vehicle 100 with this structure, the lower the height of the top surface of the loading platform 1, the more gentle the inclination angle of the loading platform 1 can be, and the shorter the rearward extension length of the loading platform 1 can be, making it easier to load and unload heavy objects. Also, the lower the loading platform 1, the lower the center of gravity of the vehicle, increasing stability even when heavy objects are loaded, and making it possible to avoid height restrictions on expressways and general roads. Furthermore, it is convenient, stable, safe, and efficient to use when traveling, so it is preferable to lower the loading platform 1 even slightly.

On the other hand, the platform 1 of the heavy goods transport vehicle 100 carries a considerable amount of heavy goods, so strength and durability are required for the platform 1 and the members reinforcing the platform 1. The chassis 2 also has a structural mechanism that allows the platform 1 to tilt and move back and forth. Therefore, reinforcing members 5 and horizontal frames 6, which will be described later, are fixed to the platform 1 to support and reinforce it, providing it with strength and durability, preventing deformation of the platform 1 over a long period of time, and allowing the platform 1 to move back and forth smoothly.

(Outrigger 9)
The outriggers 9 lift the front part of the chassis 2 and tilt it, causing the chassis 2 to slope downward toward the rear. The outriggers 9 shown in Figs. 1 to 5 are located at the front of the vehicle between the cabin 19 and the loading platform 1, and are fixed in a vertical position on both sides of the front end of the chassis 2. By extending the outriggers 9 downward, the heavy-duty transport vehicle 100 can push the front part of the chassis 2, which was in a horizontal position, up to a position higher than the rear part of the chassis 2, tilt the entire vehicle, and tilt the loading platform 1 downward toward the rear end. Furthermore, by moving the loading platform 1 backward so that the rear end of the loading platform 1 touches the ground or is close to the ground, heavy equipment and other heavy objects can be safely and easily loaded and unloaded.

The outriggers 9 are fixed to both sides of the front end of the vehicle chassis 2 as a structure that can freely expand and contract in the vertical direction, and when extended, the outriggers 9 push against the ground to lift the front of the chassis 2. As shown in FIG. 9, each outrigger 9 has a built-in hydraulic cylinder 29, and the left and right hydraulic cylinders 29 are synchronously expanded and contracted by the drive mechanism 20 to tilt the entire vehicle. Furthermore, although not shown, the outriggers can be structured to extend out to the sides of the vehicle body and touch the ground, thereby supporting the vehicle more stably.

(Cylinder 10)
1 and 4 to 7, a pair of cylinders 10 extending in the longitudinal direction are arranged on both sides under the loading platform 1 in order to move the loading platform 1 forward and backward. The cylinders 10 are arranged in parallel on both sides of the loading platform 1 and connected to the loading platform 1, and the pair of cylinders 10 extend and retract synchronously to move the loading platform 1 forward and backward.

As shown in Figures 6 and 7, the pair of cylinders 10 are arranged in parallel on both sides below the loading platform 1, extending in the longitudinal direction of the loading platform 1. One end of the pair of cylinders 10 is connected to a fixed frame 11 fixed to the front part of the chassis 2, and the other end is connected to the loading platform 1, and the cylinders 10 themselves expand and contract to move the loading platform 1 back and forth. The cylinder 10 shown in Figures 4 and 5 has the rear end of the cylinder body connected to the fixed frame 11, and the tip of the rod 10A connected to the loading platform 1 via a connecting metal fitting 16. The cylinder 10 shown in the figures has the tip of the rod 10A fixed to the cover tube 5a of the reinforcing material 5 via the connecting metal fitting 16, and is connected to the loading platform 1 via this cover tube 5a, but the tip of the rod 10A can also be directly connected to the underside of the loading platform 1. As shown in Figures 4 and 5, when the cylinder 10 extends the rod 10A, the platform 1 connected to the tip of the rod 10A moves backwards in the heavy-duty transport vehicle 100, and when the cylinder 10 retracts the rod 10A, the platform 1 connected to the tip of the rod 10A moves forwards.

For example, a hydraulic cylinder can be used for the cylinder 10. As shown in FIG. 9, the hydraulic cylinder is driven by a drive mechanism 20 to extend and retract the rod 10A. The drive mechanism 20 moves the platform 1 back and forth by synchronously extending and retracting a pair of cylinders 10. The cylinder 10 and drive mechanism 20 can use a currently commercialized mechanism or a mechanism to be developed in the future that can load a heavy object and move the platform 1 back and forth.

The stroke of the cylinder 10 to move the platform 1 forward and backward can be determined by the stroke of the extension and contraction of the rod 10A. Therefore, the total length of the cylinder 10 and the stroke of the rod 10A of the pair of cylinders 10 are determined so that, with the rod 10A extended, the rear end of the platform 1 moves to a predetermined position where it contacts or approaches the ground. The stroke of the platform 1 to move forward and backward is also determined by the total length of the platform 1 and the maximum inclination angle (α) of the chassis 2 by the outriggers 9. Therefore, the heavy-duty transport vehicle 100 has a total length (L) of the loading platform 1 of approximately 7 m to 12 m, a maximum inclination angle (α) of the chassis 2 by the outriggers 9 of approximately 5 degrees to 30 degrees, a total length (S) of the cylinder 10 of 30% to 80% of the total length of the loading platform 1, preferably 35% to 70%, and the stroke of the extension and contraction of the rod 10A is adjusted by the total length of the cylinder 10, so that when the cylinder 10 extends the rod 10A, the rear end of the loading platform 1 moves to a predetermined position where it touches or approaches the ground.

The heavy-duty transport vehicle 100 of the present invention is provided with a structure and reinforcement material 5 described below to prevent the cylinder 10 from deforming or becoming unable to expand and contract linearly due to the weight of the heavy load, shocks and vibrations during loading and transport, etc., so that the cylinder 10 can smoothly reciprocate on the loading platform 1. The heavy-duty transport vehicle 100 shown in Figures 2, 6 and 7 is provided with a reinforcement material 5 and a horizontal frame 6 on the underside of the loading platform 1 as a frame that reinforces the loading platform 1 and supports the loading platform 1 and the heavy load, in order to prevent the loading platform 1 from being curved and deformed when a considerable heavy load is loaded on the loading platform 1. The horizontal frame 6 is a frame that extends in the short direction of the loading platform 1, and the reinforcement material 5 is a vertical frame that extends in the long direction of the loading platform 1.

(Horizontal frame 6)
As shown in FIG. 2, the horizontal frames 6 are fixed at predetermined positions on the underside of the loading platform 1 at intervals in a posture extending in the short direction of the loading platform 1 to support and reinforce the loading platform 1. The horizontal frames 6 shown in the figure are, for example, square pipes. The horizontal frames 6, which are square pipes, have the advantage of being able to achieve excellent strength while reducing weight. In the horizontal frames 6 shown in FIG. 2 and FIG. 6, the first frames 6A arranged on both outer sides of the two rows of reinforcing members 5 are square pipes with an outer shape having the same width and height, and the second frames 6B arranged between the two rows of reinforcing members 5 are square pipes with an outer shape having a height lower than the width. This ensures space for placing the rails 3 and wheels 4 below the horizontal frames 6 in the area between the two rows of reinforcing members 5. As described above, the multiple horizontal frames 6 do not need to have the same structure, shape, material, width, and height, and some horizontal frames 6 can be made to have different shapes, widths, and heights from the other horizontal frames 6, or made of different materials, so that the rigidity and strength can be adjusted, and the positional relationship with other members such as the chassis 2 under the loading platform can be adjusted. Furthermore, the horizontal frame 6 does not necessarily have to be a square pipe, and channel steel, L-shaped steel, H-shaped steel, etc. can also be used.

As shown in Figure 6, the horizontal frame 6 is cut in the middle, and the cover tube 5a, which is the reinforcing material 5, is connected to this cut part, and both are fixed to the loading platform 1. The cover tube 5a is connected to the straight horizontal frame 6 so as not to reduce the strength of the connection part with the horizontal frame 6. By connecting the horizontal frame 6 and the cover tube 5a perpendicularly and fixing them to the underside of the loading platform 1, not only the connection part between the horizontal frame 6 and the cover tube 5a but also the upper surface of the horizontal frame 6 and the upper surface of the cover tube 5a can be welded over a wide and large area extending to the front, back, left and right of the underside of the loading platform 1, and the horizontal frame 6 and the cover tube 5a are more strongly integrated, including the fixed part with the loading platform 1, and the loading platform 1 can be supported and reinforced in a planar manner, improving the strength of the loading platform 1. In addition, the side of the cover tube 5a is connected to the cut portion of the horizontal frame 6, and the top surface of the horizontal frame 6 and the top surface of the cover tube 5a are fixed to the bottom surface of the cargo bed 1 at the same height, which has the advantage of lowering the position of the top surface of the cargo bed 1 compared to when the horizontal frame 6 and the cover tube 5a are connected vertically. A second reinforcing bar 5c, which will be described later, can also be interposed between the horizontal frame 6 and the cover tube 5a.

Figure 10 shows the case where a vertical load is applied to the top surface of the loading platform 1 in the direction indicated by the arrow A. To make it easier to visualize, the dotted line shows an extreme example in which a vertical load is applied in the direction of the arrow A, and the loading platform 1 and the supporting frame do not have sufficient strength and rigidity, causing the loading platform 1 to bend. As shown in Figures 6 and 10, the horizontal frame 6 and the reinforcement 5 are fixed to the bottom surface of the loading platform 1 to prevent the loading platform 1 from bending and to reinforce the loading platform 1. As shown in Figure 10, when a vertical load is applied to the top surface of the loading platform 1 in the direction indicated by the arrow A, if the loading platform 1 is bent in the direction indicated by the dotted line, a compressive force acts on the top surface of the horizontal frame 6 and a tensile force acts on the bottom surface. Similarly, a compressive force acts horizontally in the direction indicated by the arrow B on the top surface of the cover tube 5a of the reinforcement 5 connected to the horizontal frame 6, and a tensile force acts on the bottom surface of the cover tube 5a of the reinforcement 5 in the direction indicated by the arrow C. The forces acting on the top and bottom surfaces of the horizontal frame 6 and the cover tube 5a of the reinforcing material 5 are first firmly supported by the reinforcement of the horizontal frame 6, which is the main frame, and the cover tube 5a of the reinforcing material 5. In addition, the first reinforcing bar 5b, which is fixed to the cover tube 5a and will be described later, is firmly supported by being placed on the top or bottom surface, or on both the top and bottom surfaces.

(Reinforcing material 5)
The reinforcing material 5 is a vertical frame extending in the longitudinal direction of the loading platform 1 as shown in FIG. 2, and is fixed to the underside of the loading platform 1 together with the horizontal frame 6 to support and reinforce the loading platform 1 from below. The reinforcing material 5 is provided in two rows in parallel orientation extending in the longitudinal direction of the loading platform 1 on both sides of the underside of the loading platform 1. Although not shown, if one row of reinforcing material is provided on the center line of the short side of the underside of the loading platform, the one row of reinforcing material is required to have the strength to support and reinforce the heavy object and the loading platform, and a thick and heavy reinforcing material is required. Furthermore, there may be cases where it is difficult to balance the left and right sides of the short side of the loading platform, such as when the center of gravity of the heavy object on the loading platform is not loaded in the center. In contrast, by providing two rows of reinforcing material 5 in parallel orientation on both sides of the underside of the loading platform 1, it is possible to ensure strength and rigidity while suppressing the thickness and weight of each reinforcing material 5, and it is also possible to support the heavy object while maintaining the left and right balance and reinforce the loading platform 1.

The reinforcing member 5 is provided with a rectangular cover tube 5a incorporating a cylinder 10. The heavy-duty transport vehicle 100 of the present invention is structured such that the reinforcing member 5 is fixed to the underside of the loading platform 1, the reinforcing member 5 is provided with a cover tube 5a, and the cylinder 10 is disposed inside the cover tube 5a. This structure does not require a space to be provided under the loading platform 1 for the cylinder 10 to pass through in addition to the reinforcing member 5, and the height of the top surface of the loading platform 1 can be lowered, allowing heavy loads to be loaded and transported safely and easily. Furthermore, the cover tube 5a itself is the reinforcing member 5 that supports and reinforces the loading platform 1, and the cylinder 10 does not reduce the strength of the loading platform 1, and the cylinder 10 incorporating the cover tube 5a can be protected.

(Cover tube 5a)
The cover tubes 5a are provided to extend in the longitudinal direction of the loading platform 1 as the main vertical frame of the reinforcing material 5. The cover tubes 5a shown in Fig. 6 are rectangular tubular, and are lightweight as the reinforcing material 5, have strength against bending and twisting, and have high rigidity per mass. By arranging two rows of cover tubes 5a in a pair in a parallel posture on the left and right sides of the underside of the loading platform 1, they function better as vertical frames that support and reinforce the loading platform 1, and by connecting the cover tubes 5a to multiple horizontal frames 6 and further fixing them to the underside of the loading platform 1, they support and reinforce the loading platform 1 in a planar manner.

The cover tube 5a is long enough to ensure the stroke of the cylinder 10 for moving the loading platform 1 back and forth, and is long enough to cover almost the entire cylinder 10 when the rod 10A is contracted. It is preferable to ensure a margin for the position to which the loading platform 1 is moved backward, taking into consideration that the optimal position may vary depending on the slope of the road surface, road surface conditions, etc. However, the length of the cover tube 5a can be made longer than the stroke of the cylinder 10, with the longitudinal length of the loading platform 1 as the maximum, and it can play a more important role as a vertical reinforcement 5 that supports and reinforces the loading platform 1.

As shown in Figures 2, 6 and 7, a cover tube 5a is fixed to the underside of the cargo bed 1, extending vertically, and the ends of the horizontal frames 6, which are perpendicular to the cover tube 5a, are fixed to both sides of the cover tube 5a. In this state, the horizontal frames 6 fixed to the cargo bed 1 are cut away in the middle and connected to each other via the cover tube 5a. The straight horizontal frames 6 are connected to the cover tube 5a without reducing the strength of the connection with the horizontal frames 6. This structure maintains the strength to support and reinforce the cargo bed 1, while being lower in height by approximately the height of the horizontal frames 6 compared to when the horizontal frames 6 and the cover tube 5a are arranged one above the other, resulting in a strong and low cargo bed 1.

The cross-sectional shape of the cover tube 5a is rectangular, and it extends in the longitudinal direction of the loading platform 1 and is fixed to the underside of the loading platform 1. The cover tube 5a shown in Figures 6 and 7 is a square pipe with an approximately square cross-sectional shape, and has an inner shape that can store the cylinder 10 inside. The cover tube 5a has an inner diameter larger than the outer diameter of the cylinder 10 so that the cylinder 10 can be stored inside in a non-contact state, and a gap is provided between the inner surface of the cover tube 5a and the outer peripheral surface of the cylinder 10. This allows the cylinder 10 to be smoothly contracted. Furthermore, the height of the loading platform 1 can be adjusted by the height of the cover tube 5a. The cross-sectional shape of the cover tube 5a is, for example, approximately square with one side of 10 cm to 20 cm, preferably 12 cm to 18 cm, and the thickness is, for example, a square pipe with a thickness of about 4 mm to 12 mm, preferably 5 mm to 9 mm.

The pair of cover tubes 5a are arranged in parallel on the left and right sides of the underside of the loading platform 1, and the cover tubes 5a themselves serve as reinforcing members 5 that support and reinforce the loading platform 1, and are connected to the horizontal frame 6 and fixed to the underside of the loading platform 1, increasing the strength of the loading platform 1. Furthermore, since the cylinder 10 is built into the rectangular cover tube 5a, there is no need to provide additional space to install the cylinder 10. A lower loading platform 1 can be achieved compared to when the cylinder 10 is separately installed under the vertical frame. Furthermore, the rectangular cover tube 5a covers and protects the cylinder 10, and the cylinder 10 can be arranged very close to the loading platform 1, allowing the cylinder 10 to provide smooth reciprocating motion of the loading platform 1.

The square-tube cover tube 5a shown in Figures 6 and 7 has a square ring-like cross-sectional shape and closes the entire outer periphery, but the square-tube cover tube 5a can also be partially open. For example, the cover tube 5a can have an approximately C-shaped cross-sectional shape and have a partial opening extending in the axial direction. Therefore, in this specification, the term "square-tube cover tube" is not necessarily limited to a cylindrical shape with the entire outer periphery closed, but is used in a broad sense including a partially open shape. Here, the square-tube cover tube with an approximately C-shaped cross-sectional shape can be reinforced by, for example, placing a first reinforcing bar 5b (described later) opposite the open surface and closing the opening with the first reinforcing bar 5b, or placing and fixing a second reinforcing bar 5c (described later) opposite the open surface and reinforcing the opening with the second reinforcing bar 5c.

Furthermore, the cover tube 5a can also be structured to fix the tip of the rod 10A of the cylinder 10 via a connecting fitting 16. This structure has the advantage that a strong force does not act locally on the connection between the loading platform 1 and the cylinder 10 as occurs when the tip of the rod 10A of the cylinder 10 is directly connected to the loading platform 1, and the force with which the cylinder 10 drives the loading platform 1 is distributed by the cover tube 5a and acts evenly over a wide area of the loading platform 1, allowing the loading platform 1 to move smoothly without distortion.

The cover tube 5a can be long enough to fix the tip of the rod 10A of the cylinder 10 inside the square tube. The cover tube 5a can also be long enough to extend to the rear end of the loading platform 1. By making the cover tube 5a long enough to extend to the rear end of the loading platform 1, a single square tube-shaped vertical frame can be fixed to the underside of the loading platform 1, improving the strength and rigidity of the loading platform 1 in the longitudinal direction, and the strength and rigidity of the loading platform 1 as a whole can be improved by the cover tube 5a and the horizontal frame 6 connected to the cover tube 5a. When the cover tube 5a is long enough to extend to the rear end of the loading platform 1, the height of the rear end side of the cover tube 5a can be lowered or tapered to lower the step when the loading platform 1 moves backward and hits the ground, or the angle can be set so that the rear end of the underside of the loading platform 1 can hit the ground in a planar manner.

Although not shown, a vertical frame arranged parallel to the cover tube 5a can be provided at a position other than the cover tube 5a. In addition, if there is an area on the underside of the rear end of the loading platform 1 where the cover tube 5a is not arranged as a vertical frame, an extension frame can be provided as a vertical frame to reinforce the loading platform 1. For example, when the tip of the rod 10A of the cylinder 10 is directly connected to the loading platform 1, the cover tube 5a may be shorter than the overall length of the loading platform 1. For the extension frame, a square pipe, a channel steel, an L-shaped steel, an H-shaped steel, etc. can be used. The first reinforcing bar 5b and the second reinforcing bar 5c described later can also be extended to form an extension frame. The extension frame can be arranged along the outside of the pair of cover tubes 5a. However, the extension frame can also be arranged inside the pair of cover tubes 5a. As with the cover tube 5a, the horizontal frame 6 is fixed to the extension frame to firmly reinforce the rear of the loading platform 1. As described above, in a structure in which the cover tube 5a is shorter than the overall length of the cargo bed 1, the rear part of the cargo bed 1 can be reinforced by providing an extension frame. In a structure in which the cover tube 5a is provided over the entire cargo bed, the extension frame can be omitted.

As described above, the heavy goods transport vehicle 100 reinforces the loading platform 1 by connecting the horizontal frame 6 extending in the short direction of the loading platform 1 and the reinforcing material 5 extending in the longitudinal direction of the loading platform 1 together and fixing them to the loading platform 1. The reinforcing material 5 has two rows of cover tubes 5a extending in the longitudinal direction of the loading platform 1. As described above, by connecting the reinforcing material 5 and the horizontal frame 6 together and fixing them to the loading platform 1, it is possible to ensure sufficient rigidity and strength to prevent deformation of the loading platform 1 for a long period of time.

Furthermore, by incorporating a cylinder 10 inside the strong rectangular cover tube 5a, the cover tube 5a is prevented from deforming due to the weight of the loaded heavy object, and the cover tube 5a is strong enough to withstand vibrations and shocks during loading/unloading and transportation, making it possible to provide a durable heavy object transport vehicle with a tilting platform 1 that can smoothly move the platform 1 back and forth with the cylinder 10 incorporated inside the cover tube 5a.

Although not shown, in order to prevent deformation of the loading platform 1 over a long period of time in a heavy-duty transport vehicle 100 in which heavy objects are repeatedly loaded and unloaded and transported, it is possible to connect the horizontal frames 6 together, the cover tubes 5a together, and the horizontal frames 6 and the cover tubes 5a together vertically, horizontally, or diagonally, or to fix members that support and reinforce the loading platform 1 with a planar, polygonal, or curved surface to the underside of the loading platform 1, as necessary, in areas that are repeatedly loaded, areas that are prone to warping, and areas where heavy objects such as the wheels and caterpillars of the load come into contact with the loading platform 1. This is also true in the following examples described below.

(Opposite plate 5d)
An opposing plate 5d can be provided on the lower surface of the reinforcing material 5 including the cover tube 5a. The opposing plate 5d can reinforce the lower surface of the reinforcing material 5 including the cover tube 5a. In addition, it is possible to prevent the lower surface of the reinforcing material 5 including the cover tube 5a from contacting the parts supporting the cover tube 5a such as the slip plate 13 described later and wearing out, thereby reducing the strength. The material and thickness of the opposing plate 5d can be the same as or different from those of the cover tube 5a, and the strength and friction coefficient can be adjusted to improve durability. Furthermore, the height of the loading platform 1 can be finely adjusted by the thickness of the opposing plate 5d. The thickness of the opposing plate 5d is, for example, 3 mm to 1 cm.

(Slide holder 7)
The heavy-duty transport vehicle 100 shown in Figs. 6 and 7 is provided with a slide holder 7 below the reinforcement member 5 including the cover tube 5a, which supports the reinforcement member 5 from below. The slide holder 7 is fixed to the chassis 2 and arranged in a horizontal position along the lower surface of the reinforcement member 5 to support the reinforcement member 5 from below. In the heavy-duty transport vehicle 100, a plurality of slide holders 7 are arranged at predetermined intervals on the chassis 2 extending in the front-rear direction, so that the reinforcement member 5 can be supported by the slide holder 7 over almost the entire area of the chassis 2. Fig. 3 shows a plan view of the heavy-duty transport vehicle 100 with the loading platform 1 removed, and in the figure, the outer periphery of the loading platform 1 and the reinforcement member 5 are shown by a chain line. The heavy-duty transport vehicle 100 shown in the figure is provided with four slide holders 7 in the front-rear direction of the chassis 2, so that the reinforcement member 5 moving forward and backward can always be supported by the plurality of slide holders 7. In this way, by providing a plurality of slide holders 7 over almost the entire chassis 2 extended in the front-rear direction, the reinforcement member 5 moving forward and backward can be moved smoothly forward and backward while being stably supported.

As shown in Figures 6 and 7, the slide holder 7 is made of a flat metal plate with a specified length and width, with its inner side edge fixed to the chassis 2 and its outer side edge bent upwards, with the bent portion 7A positioned along the outer side of the reinforcement material 5. This slide holder 7 abuts or brings the inner surface of the bent portion 7A close to the side of the reinforcement material 5, allowing the reinforcement material 5 to move in the front-rear direction while preventing the loading platform 1 to which the reinforcement material 5 is fixed from shifting in the left-right direction. This structure has the advantage that the slide holder 7 suppresses left-right shifting of the reinforcement material 5, prevents the wheels 4 from coming off the rails 3 when the loading platform 1 moves forward and backward, and holds the loading platform 1 in a fixed position even while the vehicle is traveling.

The slide holder 7 shown in Figs. 6 and 7 is fixed to the chassis 2 by itself and is fixed to the chassis 2 via a bracket 14, and is provided in a form that protrudes from the chassis 2 below the reinforcement material 5. The approximately triangular, planar bracket 14 shown in the figure is firmly welded over a wide area to the chassis 2 and the slide holder 7, so that the bracket 14 holds the slide holder 7 in a predetermined position and the slide holder 7 can stably support the reinforcement material 5 so that it does not shift out of position. The shape of the bracket 14 is matched to the shape of the welding surface of the chassis 2 and the slide holder 7. By providing multiple brackets 14 for one slide holder 7, the slide holder 7 can be held more efficiently and firmly fixed to the chassis 2. The shape, structure, size, number, etc. of the slide holder 7 and bracket 14 are not limited to those shown in the figures, but are optimally determined according to the vehicle structure, the space under the loading platform 1, the shape of the underside of the chassis 2 and the slide holder 7, the weight of the load, etc.

The slide holder 7 is fixed to the chassis 2 and is disposed below the reinforcing material 5 including the cover tube 5a, and can support the cover tube 5a from below. The heavy-duty transport vehicle 100 can support the reinforcing material 5 from below with the slide holder 7 fixed to the chassis 2 at a different position, separate from the wheels 4 connected to the reinforcing material 5. When the heavy-duty transport vehicle 100 loads and unloads heavy objects, or when the vehicle is loaded and transported, the weight of the heavy object may apply an impact to the reinforcing material 5 including the cover tube 5a, which may cause vibration, shaking, bending, distortion, tilt, etc., but these can be suppressed at the position of the slide holder 7. In the heavy-duty transport vehicle 100, the wheels 4 run on the rails 3 to move the loading platform 1 back and forth, but the support of the reinforcing material 5 by the slide holder 7 and the suppression of vibration, etc. can reduce the load on the wheels 4 and improve the strength and durability of supporting the loading platform 1.

(Slip plate 13)
The slide holder 7 shown in Figs. 6 and 7 has a slip plate 13 on its upper surface. The slip plate 13 is disposed on the upper surface of the slide holder 7 below the reinforcing member 5. The heavy-duty transport vehicle 100 slides the reinforcing member 5 fixed to the loading platform 1 on the slip plate 13 to move the loading platform 1 back and forth. Furthermore, by providing the slip plate 13, the friction coefficient between the slide holder 7 and the reinforcing member 5 can be made smaller than when the metals directly contact each other, and the reinforcing member 5 can slide smoothly on the slip plate 13. The wheels 4 connected to the reinforcing member 5 run on the rails 3 fixed to the chassis 2, while the reinforcing member 5 is supported by the slide holder 7 and slides on the slip plate 13, so that the loading platform 1 can be moved smoothly back and forth. The material of the slip plate 13 is a material that the slide holder 7 supports the reinforcing member 5, suppresses distortion of the loading platform 1, and can withstand long-term use, and can be, for example, resin, rubber, etc. The heavy load transport vehicle 100 is based on the premise that the reinforcing material 5 fixed to the loading platform 1 slides on the slip plate 13 of the slide holder 7, and the positional relationship between the slide holder 7 and the underside of the reinforcing material 5 is optimally determined depending on the vehicle structure, the space under the loading platform 1, the heavy loads to be loaded, etc.

The heavy-duty transport vehicle 100 shown in Figs. 6 and 7 has a structure in which an opposing plate 5d is provided on the underside of the reinforcing material 5 and a slip plate 13 is provided on the slide holder 7, so that the reinforcing material 5 can slide smoothly on the slip plate 13 to move the loading platform 1 smoothly back and forth while the slide holder 7 supports the reinforcing material 5 and suppresses vibration and distortion of the reinforcing material 5. The positional relationship between the underside of the reinforcing material 5 and the slide holder 7 and the positional relationship between the opposing plate 5d and the slip plate 13 are set to an optimal range that allows the reinforcing material 5 to slide smoothly on the slip plate 13 and supports the reinforcing material 5 with the slide holder 7 to suppress vibration and distortion of the reinforcing material 5. For example, by arranging the slide holder 7 in a non-contact state with respect to the underside of the reinforcing material 5, friction with the reinforcing material 5 fixed to the loading platform 1 that moves back and forth can be prevented. By arranging the slide holder 7 in a contact state with the underside of the reinforcing material 5, the slide holder 7 can support the reinforcing material 5 and suppress vibration and distortion of the reinforcing material 5. Therefore, the positional relationship between the underside of the reinforcing material 5 and the slide holder 7, and the positional relationship between the opposing plate 5d and the slip plate 13 are set to an optimal range according to the vehicle structure, the space under the loading platform 1, the weight of the loaded load, the degree to which the slide holder 7 supports the reinforcing material 5, the degree to which the wheels 4 support the reinforcing material 5, the balance between the slide holder 7 and the wheels 4, etc., for example, by arranging them in a position where they only slightly touch, or in a non-contact state with a small gap that creates a certain resistance to the slide.

(Rail 3)
As shown in Figs. 1 to 7, the pair of rails 3 are fixed to the chassis 2 of the vehicle in a position in which each extends in the longitudinal direction of the loading platform 1. The pair of rails 3 are fixed to the upper surface of the chassis 2 in a position parallel to each other along the pair of reinforcing members 5. However, the pair of rails 3 can also be fixed to a place other than the upper surface of the chassis 2 in accordance with the shape of the chassis 2. The rails 3 shown in Figs. 6 and 7 are channel steel. The rails 3, which are channel steel, have wheels 4 arranged inside the grooves so that the wheels 4 run within the grooves. The rails 3 of this structure have the advantage that they can secure a space for the wheels 4 to roll under the loading platform 1. Furthermore, the channel-shaped rails 3 allow the loading platform 1 to move in parallel along the rails 3 by running multiple wheels 4 linearly along the grooves. However, although not shown, the rails can also be C-shaped steel (C-channel) to prevent the wheels from running off the rails.

The pair of rails 3 shown in Figures 6 and 7 are positioned inside a pair of reinforcing materials 5 with the grooves facing outward. The rails 3 can guide and run a number of wheels 4 arranged inside the reinforcing materials 5. However, although not shown, the pair of rails can also be positioned outside the pair of reinforcing materials. The rails are positioned with the grooves facing inward and can guide and run a number of wheels arranged outside the reinforcing materials.

The pair of rails 3 move the wheels 4 connected to the platform 1 forward and backward as the cylinder 10 expands and contracts. The rails 3 shown in Figures 4 and 5 have a total length almost equal to the chassis 2 that extends forward and backward, and extend all the way to the rear end of the chassis 2. This increases the range of movement of the platform 1 backward.

(Wheel 4)
The wheels 4 are connected to the platform 1 via a rotating shaft 8 fixed to the side of the reinforcement 5, and move the platform 1 forward and backward by running on the rail 3 fixed to the chassis 2. The rotating shaft 8 of the wheels 4 shown in FIG. 6 is directly fixed to the reinforcement 5. However, by interposing a plate for fixing the rotating shaft 8 between the rotating shaft 8 and the reinforcement 5 (not shown), the wheels 4 can be easily arranged at a predetermined position. For example, by fixing a second reinforcing bar 5c (described later) to the side of the reinforcement 5, the wheels 4 can be easily arranged at a predetermined position while reinforcing the reinforcement 5. In the platform 1 shown in FIGS. 1, 4, and 5, the wheels 4 are arranged linearly in the front-rear direction on the side of the reinforcement 5. The wheels 4 are arranged at a predetermined interval on the side of the reinforcement 5 so that the rotating shafts 8 of each wheel are horizontal and parallel to each other. The wheels 4 shown in the figures are made of metal, and their outer diameter is approximately equal to or slightly smaller than the groove width, which is the inner diameter of the groove-shaped rail 3. This allows the multiple wheels 4 to run in a straight line along the grooves of the rail 3.

As the cylinder 10 expands and contracts, the wheels 4 connected to the platform 1 run along the rails 3 fixed to the chassis 2, causing the platform 1 to move back and forth. The wheels 4 connected to the left and right reinforcements 5 run along a pair of rails 3 fixed to the chassis 2. In this way, by arranging the wheels 4 on both the left and right sides, the platform 1 can move back and forth while remaining horizontal. The wheels 4 are arranged vertically at regular intervals so that the wheels 4 roll along the rails 3 when the platform 1 moves back and forth. By providing multiple wheels 4 at regular intervals on both the left and right sides, the load of the platform 1 is supported by the multiple wheels 4, allowing it to move while distributing and supporting the vertical load, and the load on each rotating shaft 8 can be reduced.

The wheels 4 are connected to the reinforcing material 5 via the rotating shaft 8, so that the cylinders 10 and the wheels 4 can be arranged close to each other, and the cylinders 10 can drive the vicinity of the wheels 4 to move the platform 1 smoothly back and forth. The telescopic cylinders 10 can reliably and stably run the wheels 4 on the rails 3 to move the platform 1 back and forth. Under the platform 1, the rolling surface of the rails 3 on which the wheels 4 run cannot always be kept clean, and foreign matter that adheres to the rails increases the running resistance of the wheels 4. However, in the heavy-duty transport vehicle 100 in which the cylinders 10 drive the vicinity of the wheels 4 to move, the cylinders 10 can forcibly drive the wheels 4 back and forth to move the platform 1 stably. In particular, a structure in which the wheels 4 arranged on the left and right sides of the platform 1 are driven by cylinders 10 that are close to each other and telescopically extend and retract in sync with each other allows the platform 1 to stably move back and forth along the rails 3.

(Side holder 15)
Furthermore, the heavy goods transport vehicle 100 shown in Fig. 3 and Fig. 7 includes a side holder 15 that supports the cargo bed 1 at a different position, in addition to the wheels 4 connected to the reinforcement 5. The side holder 15 in Fig. 3 and Fig. 7 is fixed to the chassis 2, extends from the chassis 2 in the short direction of the cargo bed 1, and supports the cargo bed 1 from below outside the reinforcement 5. The side holder 15 includes a support frame 31, one end of which is fixed to the chassis 2 and the other end of which extends to the outside of the reinforcement 5, and a support base 32 that is connected to the other end of the support frame 31 and supports the cargo bed 1 from below. The wheels 4 connected to the reinforcement 5 support the cargo bed 1 near the center of the width direction of the cargo bed 1 via the reinforcement 5 on or near the chassis 2. In contrast, the side holders 15 can support the outer periphery of the loading platform 1 by arranging the support bases 32 that support the underside of the loading platform 1 in positions close to the ends of the loading platform 1 in the width direction, and can efficiently suppress the vibration, sway, bending, distortion, tilt, and height difference between the left and right sides of the loading platform 1 at the positions of the side holders 15. In particular, when a heavy-duty transport vehicle carrying heavy goods is traveling, the vibration and sway of the loading platform increases due to various factors such as the load of the heavy goods, road surface conditions, repeated acceleration and stopping, and the suspension and engine of the vehicle itself. However, by supporting the loading platform 1 on both sides, both of which are positions close to the ends of the loading platform 1 in the width direction, the vibration and sway of the loading platform 1 can be more efficiently suppressed at the positions of the side holders 15.

Multiple side holders 15 are arranged spaced apart in the fore-and-aft direction. In this way, it is preferable to provide multiple side holders 15 spaced apart in the longitudinal direction of the chassis 2. This is because each of the multiple side holders 15 can support the loading platform 1, and vibration and swaying of the loading platform 1 can be suppressed at the position of each side holder 15. The heavy-duty transport vehicle 100 shown in the figure has side holders 15 arranged at three locations, at the front, center, and rear, spaced apart in the fore-and-aft direction.

The support frame 31 comprises a horizontal frame 31A extending in the left-right direction from the side of the chassis 2 in a horizontal position, and a fixed plate 31B fixed to the horizontal frame 31A and the chassis 2 to hold the horizontal frame 31A in a horizontal position. The horizontal frame 31A shown in the figure is, for example, a square pipe. The horizontal frame 31A being a square pipe can achieve excellent strength while reducing weight. The fixed plate 31B is a metal plate with a roughly triangular shape, and by fixing this metal plate in a vertical position to the chassis 2 and the horizontal frame 31A, the horizontal frame 31A is held in a predetermined position.

The support platform 32 is provided on the support frame 31, outside the reinforcing material 5, and close to the widthwise end of the platform 1. The support platform 32 can support the platform 1 by contacting the underside of the platform 1, or the horizontal frame 6 or additional vertical frame 35 fixed to the underside of the platform, or members provided thereon, thereby suppressing vibration and shaking of the platform 1. The support platform 32 is equipped with a support plate 32A arranged above the support frame 31, and a holding part 32B that supports the support plate 32A in a horizontal position while being spaced upward from the support frame 31. The holding part 32B shown in the figure is composed of two metal plates that are welded to the upper and side surfaces of the horizontal frame 31A and fixed in a vertical position. The support platform 32 supports the platform 1 from below by contacting the support plate 32A arranged above the support frame 31 with the underside of the platform 1.

(Protruding plate portion 17)
The cargo bed 1 shown in Figs. 7 and 8 has a horizontal frame 6 fixed to its underside, and a protruding plate portion 17 arranged to protrude downward at a position opposite to the support base 32 on the underside of the horizontal frame 6. The support base 32 of the side holder 15 supports the cargo bed 1 from below via the protruding plate portion 17 and holds it in a fixed position. By positioning the protruding plate portion 17 on the support base 32, the side holder 15 can reliably support the cargo bed 1 at a predetermined position of the cargo bed 1 that moves back and forth, and vibration, swinging, etc. of the cargo bed 1 can be suppressed at the position of the side holder 15. The positional relationship between the protruding plate portion 17 and the support base 32 is determined to be in an optimal range on the premise that a heavy object is loaded, such as when the two are slightly in contact when the cargo bed 1 moves back and forth, when they are in contact and a certain resistance is generated, when there is a slight gap, or when they are not in contact. In any case, the support base 32 of the side holder 15 contacts the protruding plate portion 17, and the side holder 15 supports the cargo bed 1, and vibration, etc. of the cargo bed 1 can be suppressed. The support base 32 of the side holder 15 is preferably arranged in a state where it is close to but does not contact the underside of the loading platform 1, or in a state where it is in slidable contact with the underside of the loading platform 1 with low resistance. By providing the protruding plate portion 17 and depending on the arrangement position of the protruding plate portion 17, it is possible to specify the position where the side holder 15 supports the loading platform 1 and suppresses distortion of the loading platform 1. For example, vibrations, shocks, etc. generated when the heavy goods transport vehicle 100 transports and travels with a heavy load can be suppressed by the protruding plate portion 17 coming into contact with the support base 32 on both sides under the loading platform 1.

The side holder 15 shown in Figures 7 and 8 has a slip plate 33 disposed on the upper surface of the support plate 32A of the support base 32. By providing the slip plate 33, the coefficient of friction between the support base 32 and the protruding plate portion 17 provided on the underside of the platform 1 is reduced compared to direct metal contact between the two, allowing the protruding plate portion 17 to slide smoothly on the support base 32, thereby allowing the platform 1 to move smoothly back and forth. The material of the slip plate 33 is a material that can withstand long-term use, preventing distortion of the platform 1 by the support base 32, and can be, for example, resin or rubber.

The above side holder 15 does not always support the loading platform 1 when the loading platform 1 moves back and forth, but is structured to support the loading platform 1 when the loading platform 1 moves to a specific position. For example, the side holder 15 supports the loading platform 1 from below when the loading platform 1 is moved to the most forward position, or supports the loading platform 1 from below when the loading platform 1 is moved to the rear and the rear end is close to the ground, in other words, when a vehicle or the like is loaded or unloaded. To achieve this, the loading platform 1 shown in FIG. 3 has multiple protruding plate parts 17 spaced apart in the front-rear direction at specific positions on the bottom surface. The loading platform 1 shown in FIG. 3 has multiple protruding plate parts 17 arranged so that the protruding plate parts 17 are positioned opposite the upper surfaces of the support bases 32 of the side holder 15 when moved to the most forward position. As a result, when the loading platform 1 is moved all the way forward, in other words, when the heavy goods transport vehicle 100 is traveling, multiple points on both sides of the loading platform 1 are securely supported by the side frames 15 via the protruding plate parts 17, allowing safe travel while effectively suppressing vibration and shaking of the loading platform 1. In addition, the loading platform 1 has multiple protruding plate parts 17 arranged so that when it is moved rearward to load and unload a vehicle, the protruding plate parts 17 are positioned opposite the upper surface of the support base 32 of the side holder 15. As a result, when the loading platform 1 is moved rearward to load and unload a vehicle, both sides of the loading platform 1 are securely supported by the side frames 15 via the protruding plate parts 17, allowing safe loading and unloading while preventing vibration and shaking of the loading platform 1.

In this way, by arranging the protruding plate portion 17 at a specific position on the loading platform 1, as shown in FIG. 8A, when the loading platform 1, which moves back and forth, has moved to the specific position, the support base 32 supports the loading platform from below via the protruding plate portion 17, and as shown in FIG. 8B, when the loading platform 1 moves in the fore-aft direction from the specific position, the protruding plate portion 17 separates from the support base 32, allowing the loading platform 1 to move back and forth smoothly with low resistance.

The protruding plate portion 17 is elongated in the longitudinal direction of the loading platform 1 and has a generally rectangular shape. The protruding plate portion 17 shown in FIG. 8 has both front and rear ends with inclined surfaces that gradually become lower toward the tip, so that the protruding plate portion 17 does not get caught on the support base 32 when the loading platform 1 moves forward and backward, and can move smoothly to the opposing position on the upper surface of the support base 32. The protruding plate portion 17 can be provided on the horizontal frame 6 or the underside of the loading platform 1. The protruding plate portion 17 shown in the figure is fixed across two horizontal frames 6 arranged on the underside of the loading platform 1, and is arranged in a posture that extends forward and backward along the underside of the vertical frame 35 arranged between the two horizontal frames 6. As a result, the load of the loading platform 1 is supported by the support base 32 via the protruding plate portion 17 fixed to the horizontal frame 6 and the frame 35, so that the load of the loading platform can be stably supported by the side holder 15.

(Winch 18)
The heavy-duty transport vehicle 100 shown in Fig. 1 has a winch 18 mounted on the front panel 12 in front of the loading platform 1. Heavy objects that cannot move by themselves, such as broken-down vehicles, can be pulled up onto the loading platform 1 via a wire wound by the winch 18. By mounting the winch 18 in a position where it can move back and forth and tilt together with the loading platform 1, the wire can be stably wound in the same manner. By mounting the winch 18 in an opening 12A formed by opening a portion of the front panel 12, the size of the loading platform 1 can be utilized to the maximum extent to load heavy objects. However, although not shown, the winch 18 can also be mounted in a position other than this.

Although not shown, the heavy-duty transport vehicle 100 can also be equipped with a crane or a UNIC for lifting and moving heavy objects. A heavy-duty transport vehicle 100 equipped with a crane or a UNIC can be lifted onto the loading platform 1 via a wire.

(Drive mechanism 20)
The drive mechanism 20 synchronously contracts the pair of cylinders 10 to move the platform 1 forward and backward. The drive mechanism 20 shown in Fig. 9 shows a hydraulic circuit of a hydraulic cylinder which is the cylinder 10. The hydraulic circuit shown in this figure includes a tank 21 for storing pressurized fluid, a flow path 22 for the pressurized fluid, a pump 23 for supplying the pressurized fluid to the flow path 22, a control valve 24 for controlling the flow of the pressurized fluid, and a pilot check valve 25 arranged between the control valve 24 and the cylinder 10. The drive mechanism 20 configured with the hydraulic circuit shown in the figure supplies pressurized fluid to the pair of cylinders 10 in the following manner to synchronously expand and contract the pair of cylinders 10.

[When the cylinder 10 is extended to move the loading platform 1 backward]
When the control valve 24 is moved in the direction indicated by the arrow a, pressurized fluid pressurized by the pump 23 is supplied to the rear ends of the pair of cylinders 10. When pressurized fluid is supplied to the rear ends of the cylinders 10, the rods 10A are extended and the platform 1 is moved rearward. When the rods 10A of the cylinders 10 are extended, the pressurized fluid discharged from the front ends of the cylinders 10 passes through the control valve 24 and is then returned to the tank 21.

[When the cylinder 10 is contracted to move the platform 1 forward]
When the control valve 24 is moved in the direction indicated by the arrow b, pressurized fluid pressurized by the pump 23 is supplied to the tip ends of the pair of cylinders 10. When pressurized fluid is supplied to the tip ends of the cylinders 10, the rod 10A is contracted and the platform 1 is moved forward. When the rod 10A of the cylinder 10 is contracted, the pressurized fluid discharged from the rear end side of the cylinder 10 passes through the control valve 24 and is then returned to the tank 21.

[When the loading platform 1 is stopped at the front or rear]
9, the flow of pressurized fluid is prevented by the check valve element of the pilot check valve 25, and the extension and retraction of the cylinder 10 is stopped. The rod 10A of the cylinder 10 is held in the position where the extension and retraction is stopped, and the movement of the platform 1 is stopped.

Furthermore, the drive mechanism 20 shown in FIG. 9 also doubles as the drive mechanism for driving the outriggers 9. That is, the drive mechanism 20 in the figure can drive hydraulic cylinders 29 built into a pair of outriggers 9 with the same structure as when driving the cylinders 10 described above. Furthermore, although not shown, a hydraulic motor can be used to drive the winch 18 described above, and the winch 18 can also be driven by this drive mechanism 20.

Furthermore, the reinforcing material for reinforcing the loading platform of the heavy goods transport vehicle of the present invention can be in the form shown in the following Figures 11 to 14. Note that in the embodiments shown in the following Figures 11 to 14, the configuration other than the reinforcing material can be the same as that of the heavy goods transport vehicle 100 of the above-mentioned embodiment 1. Therefore, in the following embodiments 2 to 5, the same components as those of the heavy goods transport vehicle 100 of embodiment 1 are given the same reference numerals and detailed description thereof is omitted.

[Embodiment 2]
FIG. 11 shows a schematic vertical cross-sectional view of a reinforcing member 205 of a heavy-duty transport vehicle 200 according to a second embodiment of the present invention. The reinforcing member 205 shown in the figure includes a rectangular cylindrical cover tube 4a incorporating a cylinder 10 and a first reinforcing bar 4b fixed to the upper or lower surface of the cover tube 4a, and connects the wheels to the reinforcing member 5 via a rotating shaft. The heavy-duty transport vehicle 200 shown in FIG. 11 has two rows of reinforcing members 205 fixed to both sides of the lower surface of the bed 1 in a parallel position extending in the longitudinal direction of the bed 1. Furthermore, the reinforcing member 205 includes a first reinforcing bar 5b fixed to the lower surface of the cover tube 5a, and a second reinforcing bar 5c fixed to the side surface of the bed 1 at the center side, which is the side surface of the cover tube 5a and the first reinforcing bar 5b. The reinforcing member 205 connects the wheels 4 to the second reinforcing bar 5c via a rotating shaft 8.

The first reinforcing bar 5b and the second reinforcing bar 5c improve the strength and rigidity of the cover tube 5a from the surface where they are fixed to the cover tube 5a. In addition, the structure in which the first reinforcing bar 5b and the second reinforcing bar 5c are fixed to the cover tube 5a to form the reinforcing material 205 can be easily made of different materials or with different cross-sectional shapes. For example, only the first reinforcing bar 5b or the second reinforcing bar 5c can be made of high-tensile steel plate (high-tensile material).

The heavy goods transport vehicle 200 can be equipped with either or both of the slide holder 7 and the side holder 15. By providing the slide holder 7, the reinforcing material 205 can be supported and held. By providing the side holder 15, the side edge of the cargo bed 1 can be supported and held. The same applies to the following embodiments 3 to 5.

(First reinforcing bar 5b)
The first reinforcing bar 5b shown in FIG. 11 is fixed to the lower surface of the cover tube 5a. The first reinforcing bar 5b improves the rigidity and strength of the cover tube 5a. However, although not shown, the first reinforcing bar can also be fixed to the upper surface or both the upper and lower surfaces of the cover tube 5a. The first reinforcing bar 5b can be a flat plate, a square tube, a channel steel, a C-shaped steel (C channel), or two or more square tubes, C-shaped steel (C channel), etc., welded together. The width of the cross-sectional shape of the first reinforcing bar 5b is a length that matches the width of the cover tube 5a, and the height is, for example, 3 cm to 10 cm, preferably 4 cm to 7 cm. The first reinforcing bar 5b has an optimal thickness depending on the degree of reinforcement required, for example, 4 mm to 12 mm, preferably 5 mm to 9 mm. The thickness of the first reinforcing bar 5b can be the same as or different from that of the cover tube 5a. The first reinforcing bar 5b or the second reinforcing bar 5c described below reinforces the cover tube 5a in a planar manner, so that the strength of the loading platform 1 can be maintained while keeping the thickness of the cover tube 5a small.

As shown in Figure 10, when a vertical load is applied to the loading platform 1 in the direction of arrow A and the loading platform 1 bends in the direction shown by the dashed line, a compressive force acts on the upper surface of the horizontal frame 6, and a tensile force acts on the lower surface. In this state, a compressive force acts sideways on the upper surface of the cover tube 5a, as shown by arrow B, and a tensile force acts on the lower surface of the cover tube 5a, as shown by arrow C. The forces acting on the upper and lower surfaces of the cover tube 5a are firmly supported by the first reinforcing bar 5b, which is fixed to the upper or lower surface of the cover tube 5a.

The first reinforcing bar 5b is formed long and extends vertically in the longitudinal direction of the loading platform 1. As shown in FIG. 2, the length (D) between the horizontal frames 6 of the cover tube 5a is sufficiently long compared to the width (W) of the horizontal frames 6 (the width of the loading platform 1 in the front-rear direction), so that the force acting locally on the end of the horizontal frame 6 is distributed to the cover tube 5a and the first reinforcing bar 5b. Therefore, as shown in FIG. 10, the cover tube 5a has extremely high strength against the load received from the horizontal frame 6 in the directions of arrows B and C, and firmly connects the horizontal frames 6. Therefore, even though the horizontal frames 6 are cut in the middle and connected by the cover tube 5a, the horizontal frames 6 connected via the cover tube 5a have strength that is comparable to that of a single straight horizontal frame 6, and a strong loading platform 1 can be realized.

(Second reinforcing bar 5c)
The second reinforcing bar 5c is fixed to the side surfaces of the cover tube 5a and the first reinforcing bar 5b as shown in Fig. 11. By fixing the second reinforcing bar 5c to the side surfaces of the cover tube 5a and the first reinforcing bar 5b, the second reinforcing bar 5c, together with the cover tube 5a and the first reinforcing bar 5b, can increase the rigidity of the entire reinforcing material 205 and improve the strength against bending and distortion. In addition to a flat plate, the second reinforcing bar 5c can be a square tube, a C-shaped steel (C-channel), or the like, or two or more square tubes, C-shaped steel (C-channel), or the like welded together.

Furthermore, the second reinforcing bar 5c fixes the rotation axis 8 of the wheel 4 as shown in FIG. 11. As shown in the figure, the wheel 4 is attached to the second reinforcing bar 5c via the rotation axis 8, and the second reinforcing bar 5c is fixed to the side of the cover tube 5a and the first reinforcing bar 5b, so that the multiple wheels 4 are arranged in fixed positions on the loading platform 1. In this way, the second reinforcing bar 5c connecting the wheels 4 via the rotation axis 8 can be provided only on a part of the side of the cover tube 5a and the first reinforcing bar 5b, for example, on the part connecting the wheels 4. The reinforcing member 205 shown in the figure has multiple wheels 4 on its side, and connects these wheels 4 to the rail 3. Therefore, the reinforcing member 205 arranges the multiple wheels 4 in fixed positions by fixing multiple second reinforcing bars 5c to which the wheels 4 are connected via the rotation axis 8 to the side of the cover tube 5a and the first reinforcing bar 5b. However, the second reinforcing bar 5c can be provided on the entire side of the cover tube and the first reinforcing bar, or on part of the side across the part connecting the multiple wheels 4. This second reinforcing bar 5c has multiple rotating shafts 8 to which the wheels 4 are connected fixed at a specified interval. Furthermore, the second reinforcing bar 5c can be provided in two layers partially on a part of the side in addition to the entire side. The wheels 4 are connected to the loading platform 1 via the rotating shafts 8 fixed to the side of the reinforcing material 205, and move the loading platform 1 back and forth by running on rails 3 fixed to the chassis 2.

In the heavy-duty transport vehicle 200 shown in FIG. 11, the rail 3 is disposed inside the pair of reinforcing members 205, so the second reinforcing bar 5c to which the wheel 4 is connected is fixed inside the cover tube 5a. However, the second reinforcing bar 5c can also be provided outside the cover tube 5a. For example, in a structure in which the rail 3 is disposed outside the pair of reinforcing members 205, the second reinforcing bar 5c to which the wheel 4 is connected is fixed to the outer side of the cover tube 5a and the first reinforcing bar 5b. Furthermore, although not shown, the second reinforcing bar 5c can also be provided on both sides of the cover tube 5a and the first reinforcing bar 5b. This structure can be such that the wheel 4 is fixed to the second reinforcing bar 5c fixed to one side via the rotating shaft 8, and the wheel 4 is not connected to the second reinforcing bar 5c fixed to the other side, or the wheel 4 can be provided on the second reinforcing bar 5c fixed to both sides.

The second reinforcing bar 5c has an optimum thickness and size depending on the level of reinforcement required. The thickness and size of the second reinforcing bar 5c are designed to provide sufficient strength to reliably support the rotation shaft 8 of the wheel 4. The thickness of the second reinforcing bar 5c is, for example, 1 cm to 6 cm, and preferably 2 cm to 4 cm.

As described above, the heavy goods transport vehicle 200 reinforces the loading platform 1 by connecting the horizontal frames 6 extending in the short direction of the loading platform 1 and the reinforcing members 205 extending in the longitudinal direction of the loading platform 1 together and fixing them to the loading platform 1. The reinforcing members 205 are arranged in two rows of cover tubes 5a extending in the longitudinal direction of the loading platform 1, and a first reinforcing bar 5b and a second reinforcing bar 5c are fixed to the cover tubes 5a, both of which reinforce the loading platform 1 by reinforcing the cover tubes 5a in a planar manner. By connecting the above structure together and fixing it to the loading platform 1, it is possible to ensure sufficient rigidity and strength to prevent deformation of the loading platform 1 for a long period of time.

Furthermore, the above-mentioned heavy-duty transport vehicle 200 incorporates a cylinder 10 inside a strong rectangular cylindrical cover tube 5a, and the cover tube 5a is further reinforced surface-wise with a first reinforcing bar 5b and a second reinforcing bar 5c, thereby preventing the cover tube 5a from deforming due to the weight of the loaded heavy object, and providing sufficient strength to withstand vibrations and shocks during loading/unloading and transportation, thereby providing a heavy-duty transport vehicle with a tilting platform 1 that can smoothly reciprocate back and forth using the cylinder 10 incorporated inside the cover tube 5a. Furthermore, deformation of the cylinder 10 is prevented while loading and transporting heavy objects on the platform 1 for a long period of time, and contact between the cylinder 10 and the cover tube 5a is also prevented, realizing the feature that the platform 1 can smoothly reciprocate back and forth.

Although not shown, in order to prevent deformation of the loading platform 1 over a long period of time in a heavy-duty transport vehicle in which heavy objects are repeatedly loaded and unloaded and transported, it is possible to connect the horizontal frames 6 together, the cover tubes 5a together, and the horizontal frames 6 and the cover tubes 5a together vertically, horizontally, or diagonally, or to fix members that support and reinforce the loading platform 1 with a planar, polygonal, or curved surface to the underside of the loading platform 1, as necessary in areas that are repeatedly loaded, areas that are prone to warping, and areas where heavy objects such as the wheels and caterpillars of the load come into contact with the loading platform 1. This also applies to the following embodiments.

(Opposite plate 5d)
As shown in Fig. 11, an opposing plate 5d can be provided on the lower surface of the first reinforcing bar 5b. The opposing plate 5d can also be provided on the lower surface of the reinforcing material 205 including the first reinforcing bar 5b and the second reinforcing bar 5c. The same applies to the following Examples 4 to 6. The opposing plate 5d can reinforce the lower surface of the reinforcing material 205 including the first reinforcing bar 5b. In addition, it is possible to prevent the lower surface of the reinforcing material 205 including the first reinforcing bar 5b from coming into contact with the portion supporting the reinforcing material 205, such as the slip plate 13, and from being worn down, resulting in a decrease in strength.

[Embodiment 3]
12 is a schematic vertical cross-sectional view showing the reinforcing member 305 of the heavy-duty transport vehicle 300 according to the third embodiment of the present invention. In the reinforcing member 305 shown in this figure, the first reinforcing bar 305b is a square tube, and the first reinforcing bar 305b is fixed in a surface contact state to the underside of the cover tube 5a. By making the first reinforcing bar 305b a square tube, the reinforcing member 305 can be made lighter while reinforcing the platform 1. The first reinforcing bar 305b can be welded and fixed in a surface contact state to the cover tube 5a at the flat portion while improving the reinforcing strength at the corner portions, thereby reinforcing the cover tube 5a.

The height of the first reinforcing bar 305b can be easily adjusted. The thickness and height of the first reinforcing bar 305b, which is a square tube, affect the strength with which it supports and reinforces heavy objects, and are set to optimal values according to the level of reinforcement required. The height of the first reinforcing bar 305b can also be adjusted to adjust the height of the loading platform 1. The height of the first reinforcing bar 305b is, for example, 3 cm to 10 cm, and preferably 4 cm to 7 cm.

The first reinforcing bar 305b can be a reinforcing surface, a reinforcing block, a reinforcing member, etc. that contacts two or more inner sides of the square tube, and can also be inserted or welded. The same applies to the following embodiments 4 and 5.

[Embodiment 4]
13 is a schematic vertical cross-sectional view showing a reinforcement member 405 of a heavy-duty transport vehicle 400 according to a fourth embodiment of the present invention. The reinforcement member 405 shown in this figure is composed of a pair of channel steels 405e formed by welding the opening edges of a first reinforcement bar 405b to each other, and the pair of channel steels 405e have reinforcing ribs 405f bent inward along the opening edges, and the pair of channel steels 405e are welded to each other in a surface contact state with the reinforcing ribs 405f arranged in a vertical plane. The reinforcing ribs 405f of the channel steels 405e improve the bending strength of the first reinforcement bar 405b, and the bending strength of the reinforcement member 405 can be further improved. Therefore, the reinforcement member 405 can more effectively reinforce the loading platform 1, and the deformation of the loading platform 1 when a heavy object is loaded can be reduced.

[Embodiment 5]
FIG. 14 shows a schematic vertical cross-sectional view of the reinforcement member 505 of the heavy-duty transport vehicle 500 according to the fifth embodiment of the present invention. The reinforcement member 505 shown in this figure is formed by a first reinforcement bar 505b consisting of two square tube materials 505g, which are welded together in a surface contact state. The first reinforcement bar 505b is made of square tube materials 505g, and the first reinforcement bar 505b is made of square tube materials 505g. The reinforcing surface 505h is inserted vertically inside the first reinforcement bar 505b, so that the bending strength of the first reinforcement bar 505b is improved, and the reinforcement member 505 reinforces the loading platform 1 more effectively, and the deformation of the loading platform 1 when a heavy object is loaded can be reduced. The first reinforcement bar 505b, which is a square tube with a reinforcing surface inserted vertically inside, can be easily manufactured and procured. Although not shown, the first reinforcement bar 505b can be two or more square tube materials 505g. For example, the first reinforcing bar 505b is made of three square tubes 505g welded together in a surface contact state, and can have two vertical reinforcing surfaces 505h inside. Also, the first reinforcing bar 505b can be made by providing two or more square tubes 505g of different sizes on the inside and outside.

The present invention can be effectively used as a heavy-duty transport vehicle with a tilting platform that can transport heavy loads such as heavy machinery while preventing deformation of the platform over long periods of time and allowing the platform to move smoothly back and forth.

100, 200, 300, 400, 500...Heavy-duty transport vehicle 1...Loading platform 2...Chassis 3...Rail 4...Wheel 5, 205, 305, 405, 505...Reinforcement material 5a...Cover tube 5b, 305b, 405b, 505b...First reinforcement bar 5c...Second reinforcement bar 5d...Opposite plate 405e...Channel steel 405f...Reinforcement rib 505g...Square tube material 505h...Reinforcement surface 6...Horizontal frame 6A...First frame 6B...Second frame 7...Slide holder 7A...Bending portion 8...Rotating shaft 9...Outrigger 10...Silicon Under 10A...Rod 11...Fixed frame 12...Front panel 12A...Opening 13...Slip plate 14...Bracket 15...Side holder 16...Connecting fitting 18...Winch 19...Cabin 20...Drive mechanism 21...Tank 22...Flow path 23...Pump 24...Control valve 25...Pilot check valve 29...Hydraulic cylinder 31...Support frame 31A...Horizontal frame 31B...Fixed plate 32...Support base 32A...Support plate 32B...Holding part 33...Slip plate 35...Vertical frame

Claims (12)

A loading platform connected to a chassis of a vehicle so as to be movable forward and backward;
A pair of rails fixed to the chassis for moving the platform forward and backward;
Left and right wheels connected to the platform and running on the pair of rails to move the platform forward and backward;
A pair of cylinders each having one end connected to the platform and each extending and contracting to move the platform forward and backward;
a drive mechanism for synchronously moving the pair of cylinders back and forth;
An outrigger for tilting the chassis;
A heavy-duty transport vehicle having a tiltable loading platform,
The loading platform has two rows of reinforcements fixed to both sides of the bottom surface in parallel orientation extending in the longitudinal direction of the loading platform,
The reinforcing member includes a rectangular cover tube having the cylinder built therein,
The wheel is connected to the reinforcement member via a rotating shaft,
The slide holder is fixed to the chassis and supports the reinforcing member from below.
The slide holder has a slip plate on an upper surface thereof,
the slip plate is disposed on an upper surface of the slide holder and below the stiffener;
the slide holder supports at least the reinforcement member that has moved rearward by interposing the slip plate between the slide holder and the reinforcement member;
A heavy-duty transport vehicle with a tilting platform, characterized in that the reinforcing member fixed to the platform slides on the slip plate to move back and forth. 2. The vehicle according to claim 1, wherein the platform is tiltable.
A heavy-duty transport vehicle with a tilting platform, wherein the slip plate contains any one of resin, plastic, and rubber. A heavy-duty transport vehicle with a tiltable loading platform according to claim 1 or 2,
A heavy-duty transport vehicle with a tilting loading platform, wherein the slip plate is made of a material having a smaller coefficient of friction than when the slide holder and the reinforcing material are in direct contact with each other as metals. A heavy-duty transport vehicle with a tiltable loading platform according to any one of claims 1 to 3,
A heavy-duty transport vehicle having a tilting platform, the cover tube having a connecting fitting connected to the tip of the rod of the cylinder. A heavy-duty transport vehicle with a tiltable loading platform according to any one of claims 1 to 4,
A plurality of the slide holders are arranged,
The slide holder has the slip plate interposed between it and the reinforcing material,
A heavy-duty transport vehicle in which a loading platform supporting the reinforcement material by at least one of the slide holders tilts within a range in which the reinforcement material moves back and forth. A heavy-duty transport vehicle with a tiltable loading platform according to any one of claims 1 to 5 ,
The present invention relates to a vehicle for transporting heavy goods with a tilting platform, the vehicle further comprising an opposing plate fixed to the underside of the reinforcing member. The vehicle according to any one of claims 1 to 6 , further comprising:
a side holder fixed to the chassis and extending from the chassis in a short side direction of the cargo bed;
13. A heavy-duty transport vehicle with a tilting platform, wherein the side holder supports the platform from below on the outer side of the reinforcing material. The heavy-duty transport vehicle having a tiltable loading platform according to claim 7 ,
The side holder is
a support frame having one end fixed to the chassis and the other end extending beyond the reinforcement member;
A support platform connected to the support frame and supporting the loading platform from below;
Equipped with
The loading platform includes a protruding plate portion disposed at a position opposite to the support platform and protruding downward,
A heavy goods transport vehicle, wherein the support base of the side holder supports the cargo bed via the protruding plate portion and holds it in a fixed position. The heavy-duty transport vehicle having a tiltable loading platform according to any one of claims 1 to 8 , further comprising:
The reinforcing material comprises a first reinforcing bar fixed to the upper or lower surface of the cover tube. The heavy-duty transport vehicle having a tiltable loading platform according to claim 9 ,
The reinforcing material is
Further, a second reinforcing bar is provided which is fixed to a side surface of the cover tube and the first reinforcing bar,
2. A heavy-duty transport vehicle having a tilting platform, wherein the wheels are connected to the second reinforcing bar via a rotating shaft. A heavy-duty transport vehicle with a tiltable loading platform according to claim 9 or 10 ,
A heavy-duty transport vehicle having a tilting platform, wherein the first reinforcing bar has a square tube shape or a channel steel . A heavy-duty transport vehicle with a tiltable loading platform according to any one of claims 1 to 11 ,
A heavy-duty transport vehicle having a tilting platform, characterized in that a winch is disposed in front of the platform.

Images