A heavy goods vehicle with a tilting loading platform

Abstract

To provide a heavy object transportation vehicle which can prevent deformation of a load-carrying platform over a long term and smoothly reciprocate the load-carrying platform back and forth while loading a heavy object on the load-carrying platform and transporting the same, which has excellent durability, and in which the load-carrying platform is tilted.SOLUTION: A heavy object transport vehicle, in which a load-carrying platform 1 is tilted, comprises: the load-carrying platform 1 which is so connected as to be movable back and forth; a pair of rails 3; left and right wheels 4 which travel on the pair of rails 3 and move the load-carrying platform 1 back and forth; a pair of cylinders 10 which moves the load-carrying platform 1 back and forth; a drive mechanism for the pair of cylinders 10; and an outrigger 9 which tilts a chassis 2. Reinforcement materials 5 of two rows are fixed to the load-carrying platform 1 in a parallel posture that extends in a longer direction of the load-carrying platform 1, the reinforcement material 5 comprises a square cylindrical cover cylinder 5a in which the cylinder 10 is built, and the wheel 4 is connected to the reinforcement material 5. Further, a slider holder 7 can support the reinforcement material 5, and the reinforcement material 5 slides on a slip plate 13 of the slide holder 7 and moves back and forth.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention mainly relates to a heavy load transport vehicle in which a loading platform on which a heavy machine is mounted and transported is tilted.

Background Art

[0002] A heavy load transport vehicle with a tilting loading platform can load and unload heavy loads such as heavy machines with the loading platform tilted downward toward the rear end. This heavy load transport vehicle has a pair of tread plates connected to the rear end edge of the loading platform, and the heavy machine can be self-propelled via the tread plates and loaded and unloaded on the loading platform. However, this heavy load transport vehicle has a drawback that it is difficult to safely load and unload the heavy machine because the heavy machine travels on the tread plates connected to the rear part of the loading platform and is loaded and unloaded on the loading platform. The inventor has developed a heavy load transport vehicle that eliminates this drawback and can load and unload heavy loads such as heavy machines more safely (see Patent Document 1).

[0003] This heavy load transport vehicle uses outriggers to tilt the vehicle downward toward the rear end, and in this state, the loading platform is moved backward so that the rear end contacts or approaches the ground. Thus, the heavy machine can be directly loaded and unloaded on the loading platform without traveling on a pair of narrow tread plates as in the conventional case. This heavy load transport vehicle has a pair of cylinders arranged on both sides of the lower surface of the loading platform in order to move the loading platform back and forth. Further, in order to protect the cylinders, a vertical cylinder is fixed to the lower surface of the loading platform, and the cylinders are arranged inside this vertical cylinder. This heavy load transport vehicle has a drawback that since a heavy load is mounted on the loading platform and transported, the loading platform is deformed by the heavy load, the deformed loading platform deforms the vertical cylinder, and the further deformed vertical cylinder deforms the cylinders, making it impossible for the cylinders to smoothly reciprocate the loading platform.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The present invention has been developed for the purpose of solving the above-mentioned drawbacks. One object of the present invention is to provide a heavy object transport vehicle with a tilting loading platform that is excellent in durability, which can prevent deformation of the loading platform over a long period of time and smoothly reciprocate the loading platform back and forth while loading and transporting heavy objects such as heavy construction machines on the loading platform. Means for Solving the Problems and Effects of the Invention

[0006] A heavy object transport vehicle with a tilting loading platform according to one aspect of the present invention includes a loading platform that is movably connected to the chassis of the vehicle in the front-rear direction, a pair of rails fixed to the chassis for moving the loading platform back and forth, left and right wheels connected to the loading platform and traveling on the pair of rails for moving the loading platform back and forth, a pair of cylinders having one end connected to the loading platform and extending and contracting itself to move the loading platform back and forth, a drive mechanism for synchronously moving the pair of cylinders back and forth, and an outrigger for tilting the chassis. The loading platform has two rows of reinforcing members fixed in a parallel posture extending in the longitudinal direction of the loading platform on both sides of the lower surface. The reinforcing members include a square cylinder-shaped cover cylinder having a cylinder built therein, and the wheels are connected to the reinforcing members via a rotating shaft. Further, it includes a slide holder fixed to the chassis for supporting the reinforcing members from below, and the slide holder has a slip plate on the upper surface, The slip plate is on the upper surface of the slide holder and is disposed below the reinforcing member. The slide holder supports the at least rearwardly moved reinforcing member with the slip plate interposed therebetween with the reinforcing member. The reinforcing member fixed to the loading platform slides on the slip plate of the slide holder and moves back and forth.

[0007] The above-mentioned heavy object transport vehicle has the feature that it can prevent deformation of the loading platform over a long period of time and smoothly reciprocate the loading platform back and forth while loading and transporting heavy objects such as heavy construction machines on the loading platform. This is because the above-mentioned heavy object transport vehicle has two rows of reinforcing members fixed in a parallel posture extending in the longitudinal direction of the loading platform on both sides of the lower surface of the loading platform. The reinforcing members include a square cylinder-shaped cover cylinder having a cylinder built therein, the wheels are connected to the reinforcing members via a rotating shaft, and it also includes a slide holder fixed to the chassis for supporting the reinforcing members from below. The reinforcing member fixed to the loading platform slides on the slip plate of the slide holder and moves back and forth.

[0008] In the above heavy load carrier vehicle, a reinforcing member for reinforcing the loading platform from the lower surface is used in combination with a cover cylinder incorporating a cylinder. The reinforcing member can effectively reinforce the loading platform to prevent deformation, and the deformation of the cylinder by the cover cylinder can be prevented. Further, by connecting the wheels to the reinforcing member incorporating the cylinder, the wheels can be arranged at a position close to the cylinder, and the reinforcing member can be supported by these wheels. Furthermore, in the above heavy load carrier vehicle, separately from the wheels connected to the reinforcing member, the reinforcing member is supported from below by a slide holder fixed to the chassis. By supporting the reinforcing member with the slide holder in this way, the deformation of the cover cylinder can be prevented, and the deformation of the cylinder by the cover cylinder can be prevented. Also, vibrations, swaying, deflection, distortion, inclination, etc. of the reinforcing member due to the load of the heavy load on the loading platform during loading and unloading of the heavy load or during traveling can be suppressed by the slide holder. By supporting the reinforcing member with the slide holder and suppressing vibrations and the like, the load on the wheels can be reduced, and the strength and durability can be improved. Additionally, by providing a slip plate on the upper surface of the slide holder, the friction coefficient can be made smaller than when the slide holder and the reinforcing member directly contact each other as metals, and the reinforcing member can smoothly slide on the slip plate. While the wheels connected to the reinforcing member travel on a rail fixed to the chassis, the loading platform can be smoothly moved back and forth by the reinforcing member sliding on the slip plate.

[0009] In addition to the above aspect, the heavy load carrier vehicle with a tilting loading platform according to another aspect of the present invention can contain any one of resin, plastic, and rubber in the slip plate. In addition to the above aspect, the heavy load carrier vehicle with a tilting loading platform according to another aspect of the present invention can be configured with a material having a smaller coefficient of friction than when the slide holder and the reinforcing member directly contact each other with metal. In addition to the above aspect, the heavy load carrier vehicle with a tilting loading platform according to another aspect of the present invention can have a connecting fitting in which the cover cylinder is connected to the tip of the rod of the cylinder. In addition to the above aspect, a plurality of slide holders are arranged in the heavy load carrier vehicle with a tilting loading platform according to another aspect of the present invention. With the slip plate interposed between the slide holder and the reinforcing member, at least any one of the slide holders can support the reinforcing member within the range in which the reinforcing member moves back and forth. In the heavy load carrier vehicle in which the loading platform tilts according to another aspect of the present invention, a facing plate is further fixed to the lower surface of the reinforcing member.

[0010] The above-described heavy load carrier vehicle can reinforce the lower surface of the reinforcing member with the opposing plate. Also, it is possible to prevent the strength from decreasing due to the lower surfaces of the cover cylinder and the reinforcing member directly contacting the slip plate and wearing. Further, by adjusting the material and thickness of the opposing plate, the strength and the friction coefficient can be adjusted to improve the durability. Furthermore, the above-described heavy load carrier vehicle also has the feature that the height of the loading platform can be finely adjusted by the thickness of the opposing plate.

[0011] The heavy load carrier vehicle with a tilting loading platform according to another aspect of the present invention further includes a side holder that is fixed to the chassis and extends in the lateral direction of the loading platform from the chassis, and the side holder supports the loading platform from below outside the reinforcing member.

[0012] In addition to supporting the reinforcing member with the slide holder, the above-described heavy load carrier vehicle supports the loading platform outside the reinforcing member by the side holder fixed to the chassis. Therefore, both the slide holder and the side holder can support the loading platform more stably to prevent deformation of the loading platform, and vibrations, swaying, deflection, distortion, inclination, etc. of the loading platform can be efficiently suppressed by the side holder.

[0013] The heavy load carrier vehicle with a tilting loading platform according to another aspect of the present invention further includes a first reinforcing bar in which the reinforcing member is fixed to the upper surface or the lower surface of the cover cylinder.

[0014] In addition to supporting the reinforcing member with the slide holder, the above-described heavy load carrier vehicle reinforces the cover cylinder with the first reinforcing bar. Therefore, the reinforcing member can effectively reinforce the loading platform to prevent deformation, and further, the first reinforcing bar reinforces the cover cylinder to prevent deformation of the cover cylinder and prevent deformation of the cylinder by the cover cylinder.

[0015] The goods carrier tilting type heavy load transport vehicle according to another aspect of the present invention includes a goods carrier movably connected to the chassis of the vehicle in the front-rear direction, a pair of rails fixed to the chassis for moving the goods carrier back and forth, left and right wheels connected to the goods carrier and running on the pair of rails for moving the goods carrier back and forth, a pair of cylinders having one end connected to the goods carrier and extending and contracting itself to move the goods carrier back and forth, a drive mechanism for synchronously moving the pair of cylinders back and forth, and an outrigger for tilting the chassis. The goods carrier has two rows of reinforcing members fixed in a parallel posture extending in the longitudinal direction of the goods carrier on both sides of the lower surface, the reinforcing members include a square cylindrical cover cylinder having a built-in cylinder, and the wheels are connected to the reinforcing members via a rotating shaft. Further, it includes side holders fixed to the chassis and extending in the lateral direction of the goods carrier from the chassis, and the side holders support the goods carrier from below outside the reinforcing members.

[0016] The above-mentioned heavy load transport vehicle has the feature that it can smoothly reciprocate the goods carrier back and forth while preventing deformation of the goods carrier over a long period while loading and transporting heavy loads such as heavy machinery on the goods carrier. This is because the above-mentioned heavy load transport vehicle has two rows of reinforcing members fixed in a parallel posture extending in the longitudinal direction of the goods carrier on both sides of the lower surface of the goods carrier, the reinforcing members include a square cylindrical cover cylinder having a built-in cylinder, the wheels are connected to the reinforcing members via a rotating shaft, and it also includes side holders fixed to the chassis and extending in the lateral direction of the goods carrier from the chassis, and the side holders support the goods carrier from below outside the reinforcing members.

[0017] The above-described heavy load carrier vehicle combines a reinforcing member that reinforces the loading platform from below with a cover cylinder containing a cylinder. The reinforcing member effectively reinforces the loading platform to prevent deformation, and the cover cylinder can prevent deformation of the cylinder. Further, by connecting the wheels to the reinforcing member containing the cylinder, the wheels are arranged at positions close to the cylinder, and the reinforcing member can be supported by these wheels. Furthermore, the above-described heavy load carrier vehicle supports the loading platform from below with side holders fixed to the chassis, separately from the wheels connected to the reinforcing member. In particular, since the side holders support the loading platform from below outside the reinforcing member, vibrations, swaying, tilting, etc. of the loading platform can be efficiently suppressed. Also, during the running of the heavy load carrier vehicle loaded with heavy loads, in addition to the load of the heavy loads, vibrations and swaying increase due to various factors such as road surface conditions, repeated acceleration and stopping of the vehicle, and the suspension and engine of the vehicle itself. However, since the side holders are arranged on both sides, at positions close to the outer ends in the width direction of the loading platform, vibrations and swaying of the loading platform can be suppressed more efficiently.

[0018] In the heavy load carrier vehicle with a tilting loading platform according to another aspect of the present invention, the side holder includes a support frame with one end fixed to the chassis and the other end extended outside the reinforcing member, and a support base connected to the support frame for supporting the loading platform from below. The loading platform is provided with a protruding plate portion protruding downward at a position facing the support base, and the support base of the side holder supports the loading platform via the protruding plate portion and holds it in a fixed position.

[0019] In the above-described heavy load carrier vehicle, since the support base of the side holder supports the loading platform from below via the protruding plate portion, the side holder can reliably support the loading platform at a predetermined position of the loading platform that moves back and forth, and vibrations, swaying, etc. of the loading platform can be suppressed at the position of the side holder.

[0020] In the heavy load carrier vehicle with a tilting loading platform according to another aspect of the present invention, a plurality of side holders are arranged spaced apart in the front-rear direction. The loading platform is provided with a plurality of protruding plate portions spaced apart in the front-rear direction, and the protruding plate portions are arranged at positions facing the respective support bases when the loading platform is moved to the most forward position.

[0021] In the above heavy load carrier vehicle, in a state where the loading platform is moved to the most forward position, a plurality of protruding plate portions are arranged such that each protruding plate portion is located at a position facing the upper surface of each support base of the side holder. Therefore, in a state where the heavy load carrier vehicle is traveling, a plurality of locations on both sides of the loading platform are reliably supported by the side frame via the protruding plate portions, and the vehicle can travel safely while effectively suppressing vibrations and swaying of the loading platform.

[0022] The heavy load carrier vehicle in which the loading platform tilts according to another aspect of the present invention further includes a first reinforcing bar in which a reinforcing member is fixed to the upper surface or the lower surface of the cover cylinder.

[0023] In addition to supporting the loading platform with the side holder, the above heavy load carrier vehicle reinforces the cover cylinder with the first reinforcing bar. Therefore, the reinforcing member effectively reinforces the loading platform to prevent deformation, and further, the first reinforcing bar reinforces the cover cylinder to prevent deformation of the cover cylinder, and deformation of the cylinder by the cover cylinder can be prevented.

[0024] The heavy load carrier vehicle in which the loading platform tilts according to another aspect of the present invention includes a loading platform movably connected to the chassis of the vehicle in the front-rear direction, a pair of rails fixed to the chassis for moving the loading platform back and forth, left and right wheels connected to the loading platform for traveling on the pair of rails to move the loading platform back and forth, a pair of cylinders having one end connected to the loading platform and themselves expanding and contracting to move the loading platform back and forth, a drive mechanism for synchronously moving the pair of cylinders back and forth, and an outrigger for tilting the chassis. The loading platform has two rows of reinforcing members fixed to both sides of the lower surface in a parallel posture extending in the longitudinal direction of the loading platform. The reinforcing members include a square cylinder-shaped cover cylinder having a built-in cylinder and a first reinforcing bar fixed to the upper surface or the lower surface of the cover cylinder, and the wheels are connected to the reinforcing members via a rotation axis.

[0025] The above-described heavy-load transport vehicle has the feature that while loading and transporting heavy loads such as heavy machinery on the loading platform, it can prevent deformation of the loading platform over a long period and smoothly reciprocate the loading platform back and forth. This is because the above-described heavy-load transport vehicle fixes two rows of reinforcing members in a parallel posture extending in the longitudinal direction of the loading platform on both sides of the lower surface of the loading platform, and the reinforcing members include a square cylinder-shaped cover cylinder with a built-in cylinder, and a first reinforcing bar fixed to the upper surface or the lower surface of the cover cylinder, and the wheels are connected to the reinforcing members via a rotating shaft.

[0026] The above-described heavy-load transport vehicle uses, in combination with the cover cylinder with a built-in cylinder, a reinforcing member for reinforcing the loading platform from the lower surface, and further reinforces the cover cylinder with the first reinforcing bar and connects the wheels to the reinforcing member. Therefore, the reinforcing member effectively reinforces the loading platform and prevents deformation, and further the first reinforcing bar reinforces the cover cylinder, prevents deformation of the cover cylinder, and can prevent deformation of the cylinder by the cover cylinder. For this reason, the above-described heavy-load transport vehicle can prevent deformation of the cylinder while transporting heavy loads over a long period, and further prevent contact between the cylinder and the cover cylinder, realizing the feature of smoothly reciprocating the loading platform back and forth.

[0027] Furthermore, in the above-described heavy-load transport vehicle, since the first reinforcing bar is fixed to the upper surface or the lower surface of the rectangular tube-shaped cover tube, while reinforcing the cover tube, there is also a feature that the height of the loading platform can be adjusted by the thickness of the first reinforcing bar. The height of the loading platform directly affects the vehicle height. On the one hand, for a heavy-load transport vehicle, a lower loading platform results in a lower center of gravity, making the vehicle more stable, facilitating the loading and unloading of the loaded vehicle easily and safely, further reducing the maximum height of the loaded vehicle, and avoiding height restrictions on highways and general roads. On the other hand, it is necessary to have sufficient strength to load and transport heavy loads, and to ensure space so that there is no interference such as the loading platform contacting the rear wheels when the loading platform tilts and moves backward. Therefore, in order to set the loading platform to an optimal height according to the vehicle structure, the loaded vehicle, the required strength, the usage, etc., the above-described heavy-load transport vehicle can adjust the height of the loading platform by the thickness and height of the first reinforcing bar, which realizes the feature of being able to set the loading platform to an optimal height in various heavy-load transport vehicles. By adjusting the height of the combined cover tube and the first reinforcing bar to adjust the height of the cross frame and the diameter of the wheels, while ensuring sufficient strength to support the loading platform, the running condition of the wheels can be improved and the forward and backward movement of the loading platform can be made smooth.

[0028] In the heavy-load transport vehicle with a tilting loading platform according to another aspect of the present invention, the reinforcing member fixes the first reinforcing bar to the lower surface of the cover tube.

[0029] The above-described heavy-load transport vehicle can reinforce the lower surface of the reinforcing member with the first reinforcing bar. Also, the cover tube can be directly fixed to the lower surface of the loading platform, and the cylinder can be arranged close to the lower surface of the loading platform. While efficiently moving the loading platform on which heavy loads are loaded back and forth in the front-rear direction with the cylinder, there is a feature that the height of the loading platform can be optimally set.

[0030] In the heavy-load transport vehicle with a tilting loading platform according to another aspect of the present invention, the reinforcing member further includes a second reinforcing bar fixed to the side surface of the cover tube and the first reinforcing bar, and the wheel is connected to the second reinforcing bar via a rotation axis.

[0031] The above-described heavy load carrier vehicle fixes reinforcing members in a parallel posture extending in the longitudinal direction of the loading platform on both sides of the lower surface of the loading platform, and this reinforcing member is composed of a square tube-shaped cover cylinder containing a cylinder, a first reinforcing bar fixed to the upper surface or the lower surface of this cover cylinder, and a second reinforcing bar fixed to the side surfaces of the cover cylinder and the first reinforcing bar. The rotation axis of the wheel that travels on the rail is fixed to the second reinforcing bar. The above-described heavy load carrier vehicle uses a reinforcing member that reinforces the loading platform from the lower surface in combination with a cover cylinder containing a cylinder, further reinforces the cover cylinder with the first and second reinforcing bars, and connects the wheels to the second reinforcing bar. Therefore, the reinforcing member effectively reinforces the loading platform to prevent deformation, and further, the first reinforcing bar and the second reinforcing bar reinforce the cover cylinder to prevent deformation of the cover cylinder and prevent deformation of the cylinder by the cover cylinder. For this reason, the above-described heavy load carrier vehicle can prevent deformation of the cylinder while transporting heavy loads over a long period of time, and further prevent contact between the cylinder and the cover cylinder, realizing the feature that the loading platform can smoothly reciprocate back and forth.

[0032] In the heavy load carrier vehicle in which the loading platform tilts according to another aspect of the present invention, the first reinforcing bar has a square tube shape, and the first reinforcing bar is fixed to the lower surface of the cover cylinder in a surface contact state.

[0033] Since the above-described heavy load carrier vehicle has the first reinforcing bar in a tubular shape, it has the feature that it can reinforce the loading platform while reducing the weight of the reinforcing member.

[0034] In the heavy load carrier vehicle in which the loading platform tilts according to another aspect of the present invention, the first reinforcing bar is composed of a pair of channel steels whose opening edges are welded to each other. The pair of channel steels has reinforcing ribs that are bent inward along the opening edges, and the reinforcing ribs are arranged in a vertical plane and welded to each other in a surface contact state.

[0035] The above-described heavy load carrier vehicle can improve the bending strength of the first reinforcing bar with the reinforcing ribs of the channel steel, and further improve the bending strength of the reinforcing member. For this reason, it has the feature that the reinforcing member can more effectively reinforce the loading platform and reduce the deformation of the loading platform with heavy loads mounted thereon.

[0036] The goods carrier tilting type heavy load transport vehicle according to another aspect of the present invention has a first reinforcing bar composed of two or more square tubular members, and the square tubular members are welded in surface contact with each other.

[0037] In the above heavy load transport vehicle, a reinforcing surface enters parallel to the side surface in the longitudinal direction of the square tube inside the square tube-shaped first reinforcing bar, and the two surfaces are welded to improve the bending strength of the first reinforcing bar, so that the reinforcing material can reinforce the goods carrier more effectively and reduce the deformation of the goods carrier when carrying heavy loads.

[0038] The goods carrier tilting type heavy load transport vehicle according to another aspect of the present invention has a winch arranged in front of the goods carrier.

[0039] The above heavy load transport vehicle can lift a non-self-propelled heavy load onto the goods carrier via a wire wound by a winch.

Brief Description of the Drawings

[0040]

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Embodiments for Carrying Out the Invention

[0041] Hereinafter, the present invention will be described in detail with reference to the drawings. In the following description, terms indicating specific directions or positions (for example, "upper", "lower", and other terms including those terms) are used as necessary, but the use of those terms is for facilitating the understanding of the invention with reference to the drawings, and the technical scope of the present invention is not limited by the meanings of those terms. Also, parts denoted by the same reference numerals in a plurality of drawings indicate the same or equivalent parts or members. Furthermore, the embodiments shown below are specific examples of the technical idea of the present invention, and do not limit the present invention below. Also, the dimensions, materials, shapes, relative arrangements, etc. of the components described below are not intended to limit the scope of the present invention only to those, but are intended to be illustrative, unless otherwise specifically described. Also, the content described in one embodiment or example is applicable to other embodiments or examples. Also, the sizes and positional relationships of the members shown in the drawings may be exaggerated for clarity of explanation.

[0042] In this specification, heavy goods include, for example, passenger cars, trucks, as well as shovel cars, bulldozers, wheel loaders, crane trucks, tractors, special vehicles, etc. However, it is not limited to vehicles and heavy machinery. Regardless of the presence or absence of wheels or caterpillars, and whether it can move by itself, it widely includes heavy goods loaded on pallets, containers, etc., which can be loaded on the loading platform and transported.

[0043] In this specification, the front and rear of a vehicle refer to the longitudinal direction of the vehicle. The driver's seat side is the front side of the vehicle, and the rear end side of the opposite loading platform 1 is the rear side of the vehicle. Similarly, the front and rear of the loading platform 1 refer to the longitudinal direction of the loading platform 1. The driver's seat side is the front side of the loading platform 1, and the rear end side of the opposite loading platform 1 is the rear side of the loading platform 1. When the vehicle and the loading platform are shown vertically and horizontally, the longitudinal direction is vertical and the lateral direction is horizontal. The inner side refers to the center line side in the lateral direction of the loading platform 1, and the outer side refers to the end side in the lateral direction of the loading platform 1.

[0044] [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 loading platform removed, Figure 4 is a schematic cross-sectional view showing the state where the heavy goods transport vehicle 100 in Figure 1 tilts the vehicle, Figure 5 is a schematic cross-sectional view showing the state where the heavy goods transport vehicle 100 in Figure 4 moves the loading platform 1 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, respectively.

[0045] The heavy load carrier vehicle 100 shown in these figures includes a loading platform 1 movably connected to the chassis 2 of the vehicle in the front - rear direction, a pair of rails 3 fixed to the chassis 2 for moving the loading platform 1 in the front - rear direction, 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 in the front - rear direction, a pair of cylinders 10 having one end connected to the loading platform 1 and capable of extending and contracting itself to move the loading platform 1 in the front - rear direction, a drive mechanism 20 for synchronously moving the pair of cylinders 10 in the front - rear direction, and an outrigger 9 for tilting the chassis 7. The loading platform 1 has two rows of reinforcing members 5 fixed in a parallel posture extending in the longitudinal direction of the loading platform 1 on both sides of the lower surface. The reinforcing member 5 includes a square - cylinder - shaped cover cylinder 5a incorporating the cylinder 10, and the wheel 4 is connected to the reinforcing member 5 via a rotating shaft 8. Further, the heavy load carrier vehicle 100 includes a slide holder 7 fixed to the chassis 2 for supporting the reinforcing member 5 from below. The slide holder 7 has a slip plate 13 on the upper surface, and the reinforcing member 5 fixed to the loading platform 1 slides on the slip plate 13 of the slide holder 7 to move back and forth.

[0046] (Loading platform 1) As shown in FIGS. 1 to 5, the loading platform 1 is disposed behind the cabin 19 with a driver's seat and is substantially rectangular and elongated in the front - rear direction of the vehicle in plan view. The heavy load carrier vehicle 100 travels with a heavy load loaded on this loading platform 1 to carry the heavy load. This loading platform 1 is movably connected to the chassis 2 of the vehicle in the front - rear direction.

[0047] As shown in Fig. 4, the heavy load carrier vehicle 100 tilts the loading platform 1 by lifting the front of the chassis 2 with the outriggers 9. Further, as shown in Fig. 5, by moving the loading platform 1 backward, heavy loads can be easily loaded and unloaded. By moving the loading platform 1 backward with the front of the chassis 2 lifted, or by lifting the front of the chassis 2 with the loading platform 1 moved backward, the rear end of the loading platform 1 is grounded or brought close to the ground, enabling easy loading and unloading of heavy loads such as construction cranes. This structure allows heavy loads such as construction cranes to be directly loaded and unloaded onto the loading platform 1 without traveling on a pair of narrow tread plates as in the conventional case. Moreover, compared to a structure where a tread plate is provided at the rear end of the loading platform 1, since the loading platform 1 itself is tilted and moved to the ground, heavy loads can be easily loaded and unloaded. In particular, loading and unloading of non-self-propelled breakdown vehicles etc. is extremely easier compared to tread plates. The heavy load carrier vehicle 100 shown in the figure does not have a tread plate at the rear end of the loading platform 1, but a tread plate may be provided at the rear end of the loading platform 1 to eliminate the step between the loading platform 1 and the ground. This tread plate can be provided, for example, across substantially the entire width of the loading platform 1 or partially, so as to smoothly bridge the upper surface of the rear end of the loading platform 1 close to the ground and the ground surface.

[0048] For the heavy load carrier vehicle 100 with this structure, the lower the height of the upper surface of the loading platform 1, the more the tilt angle of the loading platform 1 can be relaxed, and the extension length of the loading platform 1 backward can be shortened, enabling easy loading and unloading of heavy loads. Also, the lower the loading platform 1, the lower the center of gravity of the vehicle, increasing the sense of stability even when loading heavy loads, avoiding height restrictions on highways and general roads, and also being conveniently, stably, safely and efficiently usable during driving. It is preferable to lower the loading platform 1 even slightly.

[0049] On the other hand, a considerably heavy load is loaded on the loading platform 1 of the heavy load carrier vehicle 100, and strength and durability are required for the loading platform 1 and the members reinforcing the loading platform 1. Also, the chassis 2 has a structural mechanism where it tilts and the loading platform 1 moves back and forth. Therefore, further, a reinforcing member 5 and a cross frame 6 described later are fixed to the loading platform 1 to support and reinforce the loading platform 1, thereby having strength and durability, preventing deformation of the loading platform 1 over a long period, and enabling the loading platform 1 to smoothly reciprocate back and forth.

[0050] (Outrigger 9) The outrigger 9 lifts the front part of the chassis 2 and tilts it to make the chassis 2 slope downward toward the rear. The outriggers 9 shown in FIGS. 1 to 5 are at the front of the vehicle between the cabin 19 and the loading platform 1, and are fixed in a vertical posture on both sides of the front end of the chassis 2. The heavy load carrier vehicle 100 can push up the front part of the chassis 2 in a horizontal posture to a position higher than the rear part of the chassis 2 by extending the outriggers 9 downward, tilt the whole vehicle, and tilt the loading platform 1 downward toward the rear end. Further, by moving the loading platform 1 backward to bring the rear end of the loading platform 1 into contact with the ground or close to the ground, heavy loads such as heavy machinery can be safely and easily loaded and unloaded.

[0051] The outrigger 9 has a structure that can be telescopically extended and retracted in the vertical direction, and is fixed on both sides of the front end of the chassis 2 of the vehicle. The extended outrigger 9 pushes the ground to lift the front part of the chassis 2. As shown in FIG. 9, each outrigger 9 incorporates a hydraulic cylinder 29, and the left and right hydraulic cylinders 29 are synchronized by a drive mechanism 20 to extend and retract to tilt the whole vehicle. Further, although not shown, the outrigger can also support the vehicle more stably by having a structure that projects laterally from the vehicle body and contacts the ground.

[0052] (Cylinder 10) The heavy load carrier vehicle 100 shown in FIGS. 1 and 4 to 7 is provided with a pair of cylinders 10 extending longitudinally on both sides under the loading platform 1 in order to move the loading platform 1 back and forth. The cylinders 10 are arranged in a parallel posture on both sides of the loading platform 1 and are connected to the loading platform 1. The pair of cylinders 10 extend and retract synchronously to move the loading platform 1 back and forth.

[0053] As shown in FIGS. 6 and 7, a pair of cylinders 10 are disposed in parallel on both sides below the loading platform 1 and extend 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 portion of the chassis 2, and the other end is connected to the loading platform 1. The cylinder 10 itself expands and contracts to move the loading platform 1 back and forth. The cylinder 10 shown in FIGS. 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 fitting 16. In the cylinder 10 of the figure, the tip of the rod 10A is fixed to the cover cylinder 5a of the reinforcing member 5 via the connecting fitting 16 and is connected to the loading platform 1 via this cover cylinder 5a. However, the tip of the rod 10A can also be directly connected to the lower surface of the loading platform 1. As shown in FIGS. 4 and 5, in the heavy load carrier vehicle 100, when the cylinder 10 extends the rod 10A, the loading platform 1 connected to the tip of the rod 10A moves backward, and when the cylinder 10 contracts the rod 10A, the loading platform 1 connected to the tip of the rod 10A moves forward.

[0054] For the cylinder 10, for example, a hydraulic cylinder can be used. 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 loading platform 1 back and forth by synchronously expanding and contracting the pair of cylinders 10. For the cylinder 10 and the drive mechanism 20, mechanisms that are currently commercialized or will be developed in the future and can load heavy objects and move the loading platform 1 back and forth can be used.

[0055] The cylinder 10 can identify the stroke for moving the loading platform 1 back and forth by the expansion and contraction stroke of the rod 10A. Therefore, for the pair of cylinders 10, with the rod 10A extended, the overall length of the cylinder 10 and the stroke of the rod 10A are determined such that the rear end of the loading platform 1 moves to a predetermined position where it contacts or approaches the ground. The stroke for the loading platform 1 to move back and forth is also identified by the overall length of the loading platform 1 and the maximum inclination angle (α) of the chassis 2 by the outriggers 9. Therefore, for the heavy load carrier vehicle 100, the overall length (L) of the loading platform 1 is set to about 7 m to 12 m, the maximum inclination angle (α) of the chassis 2 by the outriggers 9 is set to about 5 degrees to 30 degrees, and the overall length (S) of the cylinder 10 is set to 30% to 80%, preferably 35% to 70% of the overall length of the loading platform 1. By adjusting the expansion and contraction stroke of the rod 10A with the overall length of the cylinder 10, when the cylinder 10 extends the rod 10A, the rear end of the loading platform 1 moves to a predetermined position where it contacts or approaches the ground.

[0056] For the heavy load carrier vehicle 100 of the present invention, in order for the cylinder 10 to smoothly reciprocate the loading platform 1, to prevent the cylinder 10 from deforming or being unable to linearly expand and contract due to the weight of the heavy load, impact, vibration during loading and transportation, etc., it is provided with the structure and the reinforcing member 5 described later. The heavy load carrier vehicle 100 shown in FIGS. 2, 6, and 7 is provided with a reinforcing member 5 and a cross frame 6 on the lower surface of the loading platform 1 as a frame for reinforcing the loading platform 1 and supporting the loading platform 1 and the heavy load from below to prevent the loading platform 1 from being curved and deformed by loading a considerably heavy load on the loading platform 1. The cross frame 6 is a frame extending in the lateral direction of the loading platform 1, and the reinforcing member 5 is a longitudinal frame extending in the longitudinal direction of the loading platform 1.

[0057] (Cross frame 6) As shown in Fig. 2, the transverse frame 6 extends in the short side direction of the loading platform 1 and is fixed at a plurality of predetermined positions on the lower surface of the loading platform 1 at intervals to support and reinforce the loading platform 1 from below. The transverse frame 6 shown in the figure is, for example, a square pipe. The transverse frame 6 made of a square pipe has the feature that excellent strength can be realized while reducing the weight. The transverse frames 6 in Figs. 2 and 6 are such that the first frame 6A arranged on both outer sides of the two rows of reinforcing members 5 is a square pipe with an outer shape having the same width and height, and the second frame 6B arranged between the two rows of reinforcing members 5 is a square pipe with an outer shape having a height lower than the width. Thereby, a space for arranging the rails 3 and the wheels 4 below the transverse frame 6 is secured in the region between the two rows of reinforcing members 5. As described above, the plurality of transverse frames 6 do not necessarily need to have the same structure, shape, material, width, and height. Some of the transverse frames 6 can have a different shape, width, height, or different material from other transverse frames 6, so that the rigidity strength can be adjusted and the position relationship with other members such as the chassis 2 under the loading platform can be adjusted accordingly. Furthermore, the transverse frame 6 does not necessarily need to be a square pipe, and channel steel, L-shaped steel, H-shaped steel, etc. can also be used.

[0058] As shown in Fig. 6, the horizontal frame 6 is cut in the middle, and a cover cylinder 5a, which is a reinforcing member 5, is connected to this cut portion, and both are fixed to the loading platform 1. The cover cylinder 5a is connected to the linear horizontal frame 6 so as not to reduce the strength of the connection portion with the horizontal frame 6. The horizontal frame 6 and the cover cylinder 5a are connected orthogonally and fixed to the lower surface of the loading platform 1, so that not only the connection portion between the horizontal frame 6 and the cover cylinder 5a, but also the upper surfaces of the horizontal frame 6 and the cover cylinder 5a can be welded over a wide range and a large area reaching the front, rear, left, and right of the lower surface of the loading platform 1. The horizontal frame 6 and the cover cylinder 5a are more strongly integrated including the fixed portion with the loading platform 1, can support and reinforce the loading platform 1 in a planar manner, and can improve the strength of the loading platform 1. Further, the side surface of the cover cylinder 5a is connected to the cut portion of the horizontal frame 6, and the upper surfaces of the horizontal frame 6 and the cover cylinder 5a are fixed to the lower surface of the loading platform 1 at the same height, so that there is also an advantage that the position of the upper surface of the loading platform 1 can be lowered compared with the case where the horizontal frame 6 and the cover cylinder 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 cylinder 5a.

[0059] FIG. 10 shows the case where a vertical load is applied to the upper surface of the loading platform 1 in the direction indicated by arrow A. For ease of visualization, as an extreme example, the dashed line shows the case where a vertical load is applied in the direction of arrow A and the loading platform 1 and the supporting frame are not sufficiently strong and rigid, resulting in the loading platform 1 being curved. As shown in FIGS. 6 and 10, the lateral frame 6 and the reinforcing member 5 are fixed to the lower surface of the loading platform 1 to prevent the loading platform 1 from curving and reinforce the loading platform 1. As shown in FIG. 10, when a vertical load is applied to the upper surface of the loading platform 1 in the direction indicated by arrow A, if the loading platform 1 were to bend in the direction indicated by the dashed line, a compressive force would act on the upper surface of the lateral frame 6 and a tensile force would act on the lower surface. Similarly, a compressive force acts horizontally in the direction indicated by arrow B on the upper surface of the cover cylinder 5a of the reinforcing member 5 connected to the lateral frame 6, and a tensile force acts in the direction indicated by arrow C on the lower surface of the cover cylinder 5a of the reinforcing member 5. The forces acting on the upper and lower surfaces of the lateral frame 6 and the cover cylinder 5a of the reinforcing member 5 are firmly supported first by the reinforcement of the lateral frame 6, which is the main frame, and the cover cylinder 5a of the reinforcing member 5. Further, it is firmly supported by arranging a first reinforcing bar 5b, which will be described later, fixed to the cover cylinder 5a, on the upper surface or the lower surface, or both the upper and lower surfaces.

[0060] (Reinforcing member 5) As shown in FIG. 2, the reinforcing member 5 is a longitudinal frame extending in the longitudinal direction of the loading platform 1. Together with the lateral frame 6, it is fixed to the lower surface of the loading platform 1 to support and reinforce the loading platform 1 from below. The reinforcing members 5 are provided in two rows in a parallel posture extending in the longitudinal direction of the loading platform 1 on both sides of the lower surface of the loading platform 1. Although not shown, if a single row of reinforcing members were provided along the center line in the short direction of the lower surface of the loading platform, the single row of reinforcing members would be required to have the strength to support and reinforce heavy objects and the loading platform, and a thick and heavy reinforcing member would be necessary. Further, when the center of gravity of the heavy object on the loading platform is not loaded at the center, it may be difficult to balance the left and right in the short direction of the loading platform. In contrast, by providing two rows of reinforcing members 5 in a parallel posture on both sides of the lower surface of the loading platform 1, it is possible to ensure strength and rigidity while suppressing the thickness and weight of each reinforcing member 5, and also to maintain the left - right balance and support heavy objects to reinforce the loading platform 1.

[0061] The reinforcing member 5 is provided with a square cylindrical cover cylinder 5a incorporating a cylinder 10. The heavy load transport vehicle 100 of the present invention has a structure in which the reinforcing member 5 is fixed to the lower surface of the loading platform 1, the reinforcing member 5 is provided with the cover cylinder 5a, and the cylinder 10 is disposed inside the cover cylinder 5a. This structure eliminates the need to secure a space for passing the cylinder 10 separately from the reinforcing member 5 under the loading platform 1, can lower the height of the upper surface of the loading platform 1, and enables safe and easy loading and transportation of heavy loads. Furthermore, the cover cylinder 5a itself is the reinforcing member 5 that supports and reinforces the loading platform 1, the cylinder 10 can protect the cylinder 10 incorporated in the cover cylinder 5a without reducing the strength of the loading platform 1.

[0062] (Cover cylinder 5a) The cover cylinder 5a is provided so as to extend in the longitudinal direction of the loading platform 1 as the main longitudinal frame of the reinforcing member 5. The cover cylinder 5a shown in FIG. 6 is square cylindrical, is designed to be lightweight as the reinforcing member 5, has strength against bending and twisting, and has high rigidity per unit mass. By arranging two rows of cover cylinders 5a on the left and right of the lower surface of the loading platform 1 in a pair in a parallel posture, the function as a longitudinal frame for supporting and reinforcing the loading platform 1 is further fulfilled, and the cover cylinder 5a is connected to a plurality of transverse frames 6 and further fixed to the lower surface of the loading platform 1 to support and reinforce the loading platform 1 in a planar manner.

[0063] The cover cylinder 5a has a length that can sufficiently secure the stroke of the cylinder 10 for moving the loading platform 1 back and forth, and is set to a length that can cover substantially the entire cylinder 10 in a state where the rod 10A is contracted. Considering that the position for moving the loading platform 1 backward may vary depending on the slope of the road surface, road surface conditions, etc., it is preferable to secure a margin. However, the length of the cover cylinder 5a can also be made longer than the length of the stroke of the cylinder 10 with the maximum length in the longitudinal direction of the loading platform 1, and can play a more role as the longitudinal reinforcing member 5 for supporting and reinforcing the loading platform 1.

[0064] As shown in FIGS. 2, 6, and 7, a cover cylinder 5a is fixed vertically to the lower surface of the loading platform 1, and the ends of the horizontal frames 6 orthogonal to both sides of the cover cylinder 5a are fixed. In this state, the horizontal frames 6 fixed to the loading platform 1 are connected to each other via the cover cylinder 5a with a part in the middle cut off. The cover cylinder 5a has a linear horizontal frame 6 connected thereto without reducing the strength of the connection portion with the horizontal frame 6. This structure can be made approximately as low as the height of the horizontal frame 6, about the height corresponding to the horizontal frame 6, compared to the case where the horizontal frame 6 and the cover cylinder 5a are arranged vertically, while maintaining the strength to support and reinforce the loading platform 1, and a tough and low loading platform 1 can be realized.

[0065] The cross-sectional shape of the cover cylinder 5a is square, extends in the longitudinal direction of the loading platform 1, and is fixed to the lower surface of the loading platform 1. The cover cylinder 5a shown in FIGS. 6 and 7 is a square pipe with a substantially square cross-sectional shape, and has an inner shape capable of accommodating the cylinder 10 inside. The cover cylinder 5a has an inner diameter larger than the outer diameter of the cylinder 10 so that the cylinder 10 can be accommodated inside it in a non-contact state, and a gap is provided between the inner surface of the cover cylinder 5a and the outer peripheral surface of the cylinder 10. This enables the cylinder 10 to contract smoothly. Furthermore, the height of the loading platform 1 can also be adjusted by the height of the cover cylinder 5a. The cross-sectional shape of the cover cylinder 5a is, for example, a substantially square shape with one side being 10 cm to 20 cm, preferably 12 cm to 18 cm, and the thickness is, for example, a square pipe of about 4 mm to 12 mm, preferably 5 mm to 9 mm.

[0066] A pair of cover cylinders 5a are arranged in a parallel posture on the left and right of the lower surface of the loading platform 1. The cover cylinders 5a themselves serve as reinforcing members 5 that support and reinforce the loading platform 1. They are connected to the horizontal frame 6 and fixed together to the lower surface of the loading platform 1, enhancing the strength of the loading platform 1. Furthermore, by incorporating the cylinder 10 within the square tube-shaped cover cylinder 5a, there is no need to separately provide a space for installing the cylinder 10. A lower loading platform 1 can be achieved compared to the case where the cylinder 10 is separately provided below the vertical frame. Additionally, the square tube-shaped cover cylinder 5a covers and protects the cylinder 10, allowing the cylinder 10 to be disposed extremely close to the loading platform 1, and enabling a smooth reciprocating motion of the loading platform 1 by the cylinder 10.

[0067] The square tube-shaped cover cylinder 5a shown in FIGS. 6 and 7 has an outer peripheral surface entirely closed with a square-ring-shaped cross-sectional shape. However, the square tube-shaped cover cylinder 5a can also be partially opened. For example, the cover cylinder 5a can be provided with an axially extending opening partially with a substantially C-shaped cross-sectional shape. Therefore, in this specification, the "square tube-shaped cover cylinder" is not necessarily limited to a tubular shape with the entire outer peripheral surface closed, but is used in a broad sense including a partially opened shape. Here, a square tube-shaped cover cylinder with a substantially C-shaped cross-sectional shape can, for example, have a first reinforcing bar 5b (described later) arranged opposite to the opened surface to close and reinforce the opening with the first reinforcing bar 5b, or a second reinforcing bar 5c (described later) can be arranged and fixed opposite to the opened surface to reinforce the opening with the second reinforcing bar 5c.

[0068] Furthermore, the cover cylinder 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 feature that no locally strong force acts on the connecting portion between the loading platform 1 and the cylinder 10 as in the case of directly connecting the tip of the rod 10A of the cylinder 10 to the loading platform 1. The force by which the cylinder 10 drives the loading platform 1 is dispersed by the cover cylinder 5a and acts uniformly over a wide area on the loading platform 1, enabling the loading platform 1 to move smoothly without distortion.

[0069] The cover cylinder 5a can be made to have a length that fixes the tip of the rod 10A of the cylinder 10 inside a square cylinder shape. Also, the cover cylinder 5a can be made to have a length that extends to the rear end of the loading platform 1. By making the cover cylinder 5a have a length that extends to the rear end of the loading platform 1, a single square cylinder-shaped vertical frame can be fixed to the lower surface of the loading platform, the strength and rigidity in the longitudinal direction of the loading platform 1 can be improved, and the strength and rigidity of the entire loading platform 1 can be improved by the cover cylinder 5a and the horizontal frame 6 connected to the cover cylinder 5a. When the cover cylinder 5a has a length that extends to the rear end of the loading platform 1, the height on the rear end side of the cover cylinder 5a can be lowered or made tapered to reduce the step when the loading platform 1 moves rearward and touches the ground, or the angle can be set so that the rear end of the lower surface of the loading platform 1 can touch the ground in a planar manner.

[0070] Although not shown, a vertical frame arranged in parallel with the cover cylinder 5a can also be provided at a position other than the cover cylinder 5a. Also, when there is a region on the lower surface of the rear end portion of the loading platform 1 where the cover cylinder 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, there is a case where the cover cylinder 5a has a structure shorter than the full length of the loading platform 1. For the extension frame, square pipes, channel steels, L-shaped steels, H-shaped steels, 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 a pair of cover cylinders 5a. However, the extension frame can also be arranged inside a pair of cover cylinders 5a. Similar to the cover cylinder 5a, by fixing the horizontal frame 6 to the extension frame, the rear part of the loading platform 1 can be firmly reinforced. As described above, in a structure where the cover cylinder 5a is shorter than the full length of the loading platform 1, the rear part of the loading platform 1 can be reinforced by providing an extension frame. In a structure where the cover cylinder 5a is provided over the entire loading platform, the extension frame can also be omitted.

[0071] As described above, the heavy load carrier vehicle 100 connects a lateral frame 6 extending in the short side direction of the loading platform 1 and a reinforcing member 5 extending in the longitudinal direction of the loading platform 1 to each other and fixes them together to the loading platform 1 to reinforce the loading platform 1. The reinforcing member 5 has two rows of cover cylinders 5a extending in the longitudinal direction of the loading platform 1. As described above, by connecting the reinforcing member 5 and the lateral frame 6 to each other and fixing them to the loading platform 1, sufficient rigidity and strength can be ensured to prevent deformation of the loading platform 1 over a long period of time.

[0072] Furthermore, by incorporating the cylinder 10 inside the strong square cylinder-shaped cover cylinder 5a, it is possible to prevent the cover cylinder 5a from deforming due to the weight of the loaded heavy load, and by making it have sufficient strength to withstand vibrations and impacts during loading and unloading and transportation, a loading platform 1 with excellent durability that can smoothly reciprocate back and forth in the front-rear direction with the cylinder 10 incorporated inside the cover cylinder 5a can be provided for the heavy load carrier vehicle whose loading platform 1 tilts.

[0073] Although not shown, in the heavy load carrier vehicle 100 where loading and unloading and transportation of heavy loads are repeated, in order to prevent deformation of the loading platform 1 over a long period of time, depending on necessity, such as parts repeatedly subjected to heavy loads, parts prone to warping, parts where heavy loads such as wheels or caterpillars of the load contact the loading platform 1, members that support and reinforce the loading platform 1 can also be fixed to the lower surface of the loading platform 1 in addition to the lateral frames 6 and the reinforcing member 5, such as connecting the lateral frames 6 to each other, the cover cylinders 5a to each other, and the lateral frame 6 and the cover cylinder 5a in the vertical, horizontal, or diagonal directions, or members that support and reinforce the loading platform 1 with a plane, polygon, or curved surface. The same applies to the following embodiments described later.

[0074] (Opposing plate 5d) A counter plate 5d can be provided on the lower surface of the reinforcing member 5 including the cover cylinder 5a. The counter plate 5d can reinforce the lower surface of the reinforcing member 5 including the cover cylinder 5a. Further, it is possible to prevent the strength from decreasing, such as the lower surface of the reinforcing member 5 including the cover cylinder 5a coming into contact with and wearing against a portion that supports the cover cylinder 5a, such as the slip plate 13 described later. The material and thickness of the counter plate 5d can be the same as or different from those of the cover cylinder 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 counter plate 5d. The thickness of the counter plate 5d is, for example, 3 mm to 1 cm.

[0075] (Slide holder 7) The heavy load transport vehicle 100 shown in FIGS. 6 and 7 is provided with a slide holder 7 that supports the reinforcing member 5 from below, below the reinforcing member 5 including the cover cylinder 5a. The slide holder 7 is fixed to the chassis 2 and is arranged in a horizontal posture along the lower surface of the reinforcing member 5 to support the reinforcing member 5 from below. The heavy load transport vehicle 100 arranges a plurality of slide holders 7 at predetermined intervals with respect to the chassis 2 extending in the front-rear direction so that the reinforcing member 5 can be supported by the slide holders 7 over substantially the entire region of the chassis 2. FIG. 3 shows a plan view of the heavy load transport vehicle 100 with the loading platform 1 removed, and in the figure, the outer periphery of the loading platform 1 and the reinforcing member 5 are shown by dashed lines. The heavy load 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 reinforcing member 5 moving back and forth can always be supported by a plurality of slide holders 7. In this way, by providing a plurality of slide holders 7 over substantially the entire length of the chassis 2 extended in the front-rear direction, the reinforcing member 5 can be smoothly moved back and forth while being stably supported.

[0076] As shown in FIGS. 6 and 7, the slide holder 7 is composed of a planar metal plate having a predetermined length and width. The inner side edge portion is fixed to the chassis 2, and the outer side edge portion is bent upward, and this bent portion 7A is arranged along the outer surface of the reinforcing member 5. By bringing the inner surface of the bent portion 7A into contact with or close to the side surface of the reinforcing member 5, the slide holder 7 can move the reinforcing member 5 in the front-rear direction while preventing the loading platform 1 to which the reinforcing member 5 is fixed from being displaced in the left-right direction. With this structure, the slide holder 7 suppresses the displacement of the reinforcing member 5 in the left-right direction, prevents the wheels 4 from derailing from the rails 3 when the loading platform 1 moves back and forth, and has the feature that the loading platform 1 can be held in a fixed position even during the running of the vehicle.

[0077] The slide holder 7 shown in FIGS. 6 and 7 is fixed to the chassis 2 itself and is also fixed to the chassis 2 via the bracket 14, and is provided in a form protruding downward from the chassis 2 to the reinforcing member 5. By firmly welding the substantially triangular and planar bracket 14 shown in the figure to the chassis 2 and the slide holder 7 over a wide range, the bracket 14 holds the slide holder 7 in a predetermined position and can stably support the slide holder 7 so that it does not displace the reinforcing member 5. The shape of the bracket 14 is adapted to the shapes of the welding surfaces of the chassis 2 and the slide holder 7. By providing a plurality of brackets 14 for one slide holder 7, the slide holder 7 can be held more efficiently and can be firmly fixed to the chassis 2. The shapes, structures, sizes, numbers, etc. of the above slide holder 7 and bracket 14 are not limited to those shown in the figure, and are optimally determined according to the structure of the vehicle, the space under the loading platform 1, the shapes of the lower surfaces of the chassis 2 and the slide holder 7, the weight of the load to be loaded, etc.

[0078] The slide holder 7 is fixed to the chassis 2 and disposed below the reinforcing member 5 including the cover cylinder 5a, and can support the cover cylinder 5a from below. The heavy load carrier vehicle 100 can support the reinforcing member 5 from below by the slide holder 7 fixed to the chassis 2 at a different position, separately from the wheels 4 connected to the reinforcing member 5. In particular, when loading and unloading heavy loads or when carrying heavy loads and driving, an impact is applied to the reinforcing member 5 including the cover cylinder 5a due to the load of the heavy load, and vibrations, shakes, deflections, distortions, tilts, etc. may occur, but these can be suppressed at the position of the slide holder 7. In the heavy load carrier vehicle 100, the wheels 4 travel on the rail 3 to move the loading platform 1 back and forth. By supporting the reinforcing member 5 by the slide holder 7 and suppressing vibrations and the like, the load on the wheels 4 can be reduced, and the strength and durability of supporting the loading platform 1 can be improved.

[0079] (Slip plate 13) The slide holder 7 shown in FIGS. 6 and 7 is provided with a slip plate 13 on its upper surface. The slip plate 13 is disposed on the upper surface of the slide holder 7 and below the reinforcing member 5. The heavy load carrier 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. Further, by providing the slip plate 13, the friction coefficient is made smaller than when the slide holder 7 and the reinforcing member 5 directly contact each other with metal, and the reinforcing member 5 can slide smoothly on the slip plate 13. While the wheels 4 connected to the reinforcing member 5 travel on the rail 3 fixed to the chassis 2, 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 smoothly moved back and forth. The material of the slip plate 13 can be a material that can withstand long-term use by supporting the reinforcing member 5 by the slide holder 7 and suppressing distortions of the loading platform 1, etc., such as resin or rubber. The heavy load carrier vehicle 100 determines the positional relationship between the slide holder 7 and the lower surface of the reinforcing member 5 optimally according to the structure of the vehicle, the space under the loading platform 1, the heavy load to be loaded, etc., on the premise that the reinforcing member 5 fixed to the loading platform 1 slides on the slip plate 13 of the slide holder 7.

[0080] The heavy load carrier vehicle 100 shown in FIGS. 6 and 7 is structured such that a facing plate 5d is provided on the lower surface of the reinforcing member 5, and a slip plate 13 is provided on the slide holder 7. This allows the reinforcing member 5 to slide smoothly on the slip plate 13, enabling the loading platform 1 to move smoothly back and forth. The slide holder 7 supports the reinforcing member 5, suppressing vibrations and distortions of the reinforcing member 5. The positional relationship between the lower surface of the reinforcing member 5 and the slide holder 7, and the positional relationship between the facing plate 5d and the slip plate 13 are determined within an optimal range that enables the reinforcing member 5 to slide smoothly on the slip plate 13, allows the slide holder 7 to support the reinforcing member 5, and suppresses vibrations and distortions of the reinforcing member 5. For example, the slide holder 7 can be arranged in a non-contact state with respect to the lower surface of the reinforcing member 5 to prevent friction with the reinforcing member 5 fixed to the loading platform 1 that moves back and forth. By arranging the slide holder 7 in a contact state with respect to the lower surface of the reinforcing member 5, the slide holder 7 can support the reinforcing member 5 and suppress vibrations and distortions of the reinforcing member 5. Therefore, the positional relationship between the lower surface of the reinforcing member 5 and the slide holder 7, and the positional relationship between the facing plate 5d and the slip plate 13 are arranged, for example, in a slightly touching position, in a non-contact state with a slight gap that causes a certain resistance to sliding, etc., according to the vehicle structure, the space under the loading platform 1, the heavy load to be loaded, the degree of support of the reinforcing member 5 by the slide holder 7, the degree of support of the reinforcing member 5 by the wheels 4, the balance between the slide holder 7 and the wheels 4, etc., within an optimal range.

[0081] (Rail 3) As shown in FIGS. 1 to 7, a pair of rails 3 are fixed to the chassis 2 of the vehicle in a posture extending 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 posture parallel to each other along a pair of reinforcing members 5. However, the pair of rails 3 can also be fixed to other than the upper surface of the chassis 2 according to the shape of the chassis 2. The rails 3 shown in FIGS. 6 and 7 are channel steels (channels). The rail 3 which is a channel steel (channel) arranges the wheels 4 inside the groove and allows the wheels 4 to run inside the groove. The rail 3 with this structure has the feature that a space can be secured for the wheels 4 to roll under the loading platform 1. Further, the grooved rail 3 can move the loading platform 1 parallel along the rail 3 by running a plurality of wheels 4 linearly along the groove. However, although not shown, the rail can also be made into a C-shaped steel (C-channel) in order to prevent the wheels from coming off the rails.

[0082] The pair of rails 3 shown in FIGS. 6 and 7 are arranged inside a pair of reinforcing members 5 with the grooves facing outward. The rail 3 can guide and run a plurality of wheels 4 arranged inside the reinforcing member 5. However, although not shown, the pair of rails can also be arranged outside the pair of reinforcing members. This rail is arranged with the groove facing inward and guides and runs a plurality of wheels arranged outside the reinforcing member.

[0083] The pair of rails 3 cause the wheels 4 connected to the loading platform 1 to run as the cylinder 10 expands and contracts, thereby moving the loading platform 1 back and forth. The rails 3 shown in FIGS. 4 and 5 are provided so as to extend to the rear end of the chassis 2 with an overall length substantially equal to that of the chassis 2 extending back and forth. Thereby, the moving range in which the loading platform 1 moves backward is increased.

[0084] (Wheels 4) The wheel 4 is connected to the loading platform 1 via a rotating shaft 8 fixed to the side surface of the reinforcing member 5, and moves the loading platform 1 back and forth by running on a rail 3 fixed to the chassis 2. The rotating shaft 8 of the wheel 4 shown in Fig. 6 is directly fixed to the reinforcing member 5. However, although not shown, by interposing a plate or the like for fixing the rotating shaft 8 between the rotating shaft 8 and the reinforcing member 5, a plurality of wheels 4 can be easily arranged at a predetermined position. For example, by fixing a second reinforcing bar 5c described later to the side surface of the reinforcing member 5, the reinforcing member 5 can be reinforced while the wheels 4 can be easily arranged at a predetermined position. The loading platform 1 shown in Figs. 1, 4, and 5 has a plurality of wheels 4 arranged linearly in the front-rear direction on the side surface of the reinforcing member 5. The plurality of wheels 4 are arranged at a predetermined interval on the side surface of the reinforcing member 5 such that the respective rotating shafts 8 are in a horizontal posture and parallel to each other. The wheel 4 shown in the figure is made of metal, and its outer diameter is made substantially equal to or slightly smaller than the groove width, which is the inner diameter of the groove-shaped rail 3. Thereby, a plurality of wheels 4 can run linearly along the groove of the rail 3.

[0085] As the cylinder 10 expands and contracts, the loading platform 1 is moved back and forth by the wheels 4 connected to the loading platform 1 running on the rails 3 fixed to the chassis 2. The wheels 4 connected to the left and right reinforcing members 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 loading platform 1 can move back and forth while maintaining a horizontal state. The wheels 4 are arranged vertically at regular intervals so that they roll along the rail 3 when the loading platform 1 moves back and forth. By providing a plurality of wheels 4 at regular intervals on both the left and right sides, the load of the loading platform 1 can be supported by the plurality of wheels 4, and it can move while being dispersed and supported against the vertical load, and the load on each rotating shaft 8 can be reduced.

[0086] By connecting the wheel 4 to the reinforcing member 5 via the rotating shaft 8, the cylinder 10 and the wheel 4 can be arranged close to each other, and the cylinder 10 can drive in the vicinity of the wheel 4 to smoothly move the loading platform 1 back and forth. The telescopic cylinder 10 can reliably and stably run the wheel 4 on the rail 3 to move the loading platform 1 back and forth. Under the loading platform 1, the rolling surface of the rail 3 on which the wheel 4 runs cannot always be maintained in a clean state, and the adhering foreign matter increases the running resistance of the wheel 4. However, in the heavy load transport vehicle 100 where the cylinder 10 drives and moves in the vicinity of the wheel 4, the cylinder 10 can forcibly drive the wheel 4 back and forth to stably move the loading platform 1. In particular, the structure in which each wheel 4 arranged on the left and right of the loading platform 1 is driven by cylinders 10 that are in the vicinity and expand and contract in synchronization with each other can stably move the loading platform 1 back and forth along the rail 3.

[0087] (Side holder 15) Furthermore, the heavy load carrier vehicle 100 shown in FIGS. 3 and 7 includes side holders 15 that support the loading platform 1 at different positions, separately from the wheels 4 connected to the reinforcing member 5. The side holders 15 in FIGS. 3 and 7 are fixed to the chassis 2 and extend from the chassis 2 in the lateral direction of the loading platform 1, and support the loading platform 1 from below outside the reinforcing member 5. The side holder 15 includes a support frame 31 having one end fixed to the chassis 2 and the other end extended outside the reinforcing member 5, and a support base 32 connected on the other end portion of the support frame 31 to support the loading platform 1 from below. The wheels 4 connected to the reinforcing member 5 support the loading platform 1 near the center in the width direction of the loading platform 1 via the reinforcing member 5 on or near the chassis 2. In contrast, the side holder 15 can support the vicinity outside the loading platform 1 by arranging the support base 32 that supports the lower surface of the loading platform 1 at a position close to the end side in the width direction of the loading platform 1, and can efficiently suppress vibrations, sway, deflection, distortion, inclination, left - right height differences, etc. of the loading platform 1 at the position of the side holder 15. In particular, during the running of the heavy load carrier vehicle loaded with heavy loads, in addition to the load of the heavy loads, vibrations, sway, etc. of the loading platform become large due to various factors such as road surface conditions, repeated acceleration and deceleration, and the suspension and engine of the vehicle itself. However, since the side holders 15 support the loading platform 1 at positions close to the end sides in the width direction of the loading platform 1 on both sides, vibrations, sway, etc. of the loading platform 1 can be more efficiently suppressed at the position of the side holders 15.

[0088] A plurality of side holders 15 are arranged at intervals in the front - rear direction. Thus, it is preferable to provide a plurality of side holders 15 at intervals in the longitudinal direction of the chassis 2. This is because each of the plurality of side holders 15 can support the loading platform 1 and can suppress vibrations, sway, etc. of the loading platform 1 at the position of each side holder 15. In the heavy load carrier vehicle 100 shown in the figure, side holders 15 are arranged at three positions, namely, the front, the center, and the rear, at intervals in the front - rear direction.

[0089] The support frame 31 includes a horizontal frame 31A that extends horizontally in the left-right direction in a horizontal posture from the side surface of the chassis 2, and a fixing plate 31B that is fixed to the horizontal frame 31A and the chassis 2 to hold the horizontal frame 31A in a horizontal posture. The horizontal frame 31A shown in the figure is, for example, a square pipe. The horizontal frame 31A which is a square pipe can achieve excellent strength while reducing weight. The fixing plate 31B is a substantially triangular metal plate, and by fixing this metal plate in a vertical posture to the chassis 2 and the horizontal frame 31A, the horizontal frame 31A is held in a predetermined posture.

[0090] The support base 32 is provided on the support frame 31, outside the reinforcing member 5, and at a position close to the end side in the width direction of the loading platform 1. The support base 32 can support the loading platform 1 by contacting the lower surface of the loading platform 1, or the horizontal frame 6 or the additional vertical frame 35 fixed to the lower surface of the loading platform, or the members provided thereon, thereby suppressing vibrations, swaying, etc. of the loading platform 1. The support base 32 includes a support plate 32A disposed above the support frame 31, and a holding portion 32B that supports the support plate 32A in a horizontal posture while being spaced upward from the support frame 31. The holding portion 32B shown in the figure is composed of two metal plates welded in a range reaching the upper surface and the side surface of the horizontal frame 31A and fixed in a vertical posture. The support base 32 supports the loading platform 1 from below by bringing the support plate 32A disposed above the support frame 31 into contact with the lower surface side of the loading platform 1.

[0091] (Protruding plate portion 17) The loading platform 1 shown in FIGS. 7 and 8 has a horizontal frame 6 fixed to its lower surface, and a protruding plate portion 17 that protrudes downward is provided at a position on the lower surface side of the horizontal frame 6 and opposite to the support base 32. The support base 32 of the side holder 15 supports the loading platform 1 from below via the protruding plate portion 17 and holds it in a fixed position. By having the protruding plate portion 17 positioned above the support base 32, the side holder 15 can reliably support the loading platform 1 at a predetermined position during the forward and backward movement of the loading platform 1, and vibrations, swaying, etc. of the loading platform 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 within an optimal range on the premise of loading heavy objects, such as when the two slightly contact, contact to generate a certain resistance, provide a slight gap, or be non-contact when the loading platform 1 moves forward and backward. In any case, the support base 32 of the side holder 15 contacts the protruding plate portion 17 to support the loading platform 1 and suppress vibrations, etc. of the loading platform 1. The support base 32 of the side holder 15 is preferably arranged in a state of approaching but not contacting the lower surface of the loading platform 1, or in a state of contacting the lower surface of the loading platform 1 with low resistance and being slidable. By providing the protruding plate portion 17 and depending on the arrangement position of the protruding plate portion 17, the position where the side holder 15 supports the loading platform 1 and suppresses distortions, etc. of the loading platform 1 can be specified. For example, vibrations, impacts, etc. that occur when the heavy object transport vehicle 100 loads and transports heavy objects can be suppressed by the contact between the protruding plate portion 17 and the support base 32 on both sides under the loading platform 1.

[0092] The side holder 15 shown in FIGS. 7 and 8 has a slip plate 33 arranged on the upper surface of the support plate 32A of the support base 32. By providing the slip plate 33, the friction coefficient is made smaller than when the support base 32 and the protruding plate portion 17 provided on the lower surface of the loading platform 1 directly contact each other as metals, and the loading platform 1 can be smoothly moved back and forth by smoothly sliding the protruding plate portion 17 on the support base 32. The material of the slip plate 33 is a material that can withstand long-term use by having the support base 32 support the loading platform 1 and suppress distortions, etc. of the loading platform 1, and for example, resin, rubber, etc. can be used.

[0093] The above side holders 15 are not structured to always support the loading platform 1 with respect to the loading platform 1 that moves back and forth, but rather to support the loading platform 1 when the loading platform 1 moves to a specific position. For example, the side holders 15 support the loading platform 1 from below when the loading platform 1 is moved to the most forward position, or support the loading platform 1 from below when the loading platform 1 is moved rearward and the rear end approaches the ground, in other words, when loading and unloading a vehicle or the like. To achieve this, the loading platform 1 shown in FIG. 3 is provided with a plurality of protruding plate portions 17 at specific positions on the lower surface spaced apart in the front-rear direction. The loading platform 1 shown in FIG. 3 arranges a plurality of protruding plate portions 17 such that the protruding plate portions 17 are located at positions facing the upper surfaces of the respective support bases 32 of the side holders 15 in the state where the loading platform 1 is moved to the most forward position. Thereby, in the state where the loading platform 1 is moved to the most forward position, in other words, in the state where the heavy load carrier vehicle 100 is traveling, a plurality of locations on both side portions of the loading platform 1 are reliably supported by the side frames 15 via the protruding plate portions 17, and the loading platform 1 can travel safely while effectively suppressing vibration and sway of the loading platform 1. Further, the loading platform 1 arranges a plurality of protruding plate portions 17 such that the protruding plate portions 17 are located at positions facing the upper surfaces of the support bases 32 of the side holders 15 in the state where the loading platform 1 is moved rearward and a vehicle or the like is loaded and unloaded. Thereby, in the state where the loading platform 1 is moved rearward and a vehicle or the like is loaded and unloaded, both side portions of the loading platform 1 are reliably supported by the side frames 15 via the protruding plate portions 17, and the loading platform 1 can be safely loaded and unloaded while preventing vibration and sway of the loading platform 1.

[0094] Thus, by arranging the protruding plate portions 17 at specific positions of the loading platform 1, as shown in FIG. 8A, in the state where the loading platform 1 that moves back and forth moves to a specific position, the support base 32 supports the loading platform from below via the protruding plate portions 17, and as shown in FIG. 8B, when the loading platform 1 moves in the front-rear direction from a specific position, the protruding plate portions 17 separate from the support base 32 so that the loading platform 1 can move smoothly back and forth in a low-resistance state.

[0095] The protruding plate portion 17 is formed in a substantially rectangular shape elongated in the longitudinal direction of the loading platform 1. The protruding plate portion 17 shown in FIG. 8 has a shape that gradually becomes lower toward the tip with the front and rear ends being inclined surfaces, so that when the loading platform 1 moves back and forth, the protruding plate portion 17 is not caught by the support base 32, and it 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 lateral frame 6 or the lower surface of the loading platform 1. The protruding plate portion 17 shown in the figure is fixed so as to straddle the two lateral frames 6 arranged on the lower surface of the loading platform 1, and is arranged in a posture extending back and forth along the lower surface of the vertical frame 35 arranged between the two lateral frames 6. Thereby, the load of the loading platform 1 is supported by the support base 32 via the protruding plate portion 17 fixed to the lateral frame 6 and the frame 35, so that the load of the loading platform can be stably supported by the side holders 15.

[0096] (Winch 18) In the heavy load transport vehicle 100 shown in FIG. 1, a winch 18 is arranged on the front panel 12 in front of the loading platform 1. A heavy object that cannot move by itself, such as a breakdown vehicle, can be pulled up onto the loading platform 1 via a wire wound by the winch 18. By providing the winch 18 at a position where it can move back and forth and tilt together with the loading platform 1, the wire can be wound stably in the same manner. The winch 18 is provided in an opening 12A formed by opening a part of the front panel 12, so that 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 provided at other positions.

[0097] Although not shown, the heavy load transport vehicle 100 can also be equipped with a crane and a unique device for lifting and moving heavy objects. The heavy load transport vehicle 100 equipped with a crane, a unique device, etc. can be pulled up onto the loading platform 1 via a wire.

[0098] (Drive mechanism 20) The drive mechanism 20 synchronously contracts a pair of cylinders 10 to move the loading platform 1 back and forth. The drive mechanism 20 shown in FIG. 9 shows the 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 disposed between the control valve 24 and the cylinder 10. The drive mechanism 20 constituted by the hydraulic circuit shown in the figure supplies pressurized fluid to a pair of cylinders 10 as follows to synchronously extend and contract the pair of cylinders 10.

[0099] [When extending the cylinder 10 to move the loading platform 1 rearward] When the control valve 24 is moved in the direction indicated by the arrow a, the pressurized fluid pressurized by the pump 23 is supplied to the rear end side of the pair of cylinders 10. When the pressurized fluid is supplied to the rear end side of the cylinder 10, the rod 10A is extended and the loading platform 1 is moved rearward. When the rod 10A of the cylinder 10 is extended, the pressurized fluid discharged from the front end side of the cylinder 10 passes through the control valve 24 and then returns to the tank 21.

[0100] [When contracting the cylinder 10 to move the loading platform 1 forward] When the control valve 24 is moved in the direction indicated by the arrow b, the pressurized fluid pressurized by the pump 23 is supplied to the front end side of the pair of cylinders 10. When the pressurized fluid is supplied to the front end side of the cylinder 10, the rod 10A is contracted and the loading 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 then returns to the tank 21.

[0101] [When stopping the loading platform 1 forward or backward] When the control valve 24 is in the stop position shown in FIG. 9, the flow of the pressurized fluid is blocked by the check valve body of the pilot check valve 25, and the expansion and contraction of the cylinder 10 are stopped. The rod 10A of the cylinder 10 is held at the position where the expansion and contraction are stopped, and the movement of the loading platform 1 is stopped.

[0102] Furthermore, the drive mechanism 20 shown in FIG. 9 also serves as a drive mechanism for driving the outrigger 9. That is, the drive mechanism 20 in the figure can drive the hydraulic cylinders 29 built into the pair of outriggers 9 with the same structure as when driving the aforementioned cylinder 10. Furthermore, although not shown, a hydraulic motor is used for the motor that drives the aforementioned winch 18, and the winch 18 can also be driven by this drive mechanism 20.

[0103] Furthermore, the heavy load transport vehicle of the present invention can also adopt a reinforcing member for reinforcing the loading platform in the forms shown in FIGS. 11 to 14 below. In the embodiments shown in FIGS. 11 to 14 below, for the components other than the reinforcing member, the same configuration as that of the heavy load transport vehicle 100 of the aforementioned Embodiment 1 can be adopted. Therefore, in the following Embodiments 2 to 5, the same components as those of the heavy load transport vehicle 100 of Embodiment 1 are denoted by the same reference numerals, and detailed descriptions thereof are omitted.

[0104] [Embodiment 2] FIG. 11 shows a schematic vertical cross-sectional view showing a reinforcing member 205 of a heavy load transport vehicle 200 according to Embodiment 2 of the present invention. The reinforcing member 205 shown in the figure includes a square cylinder-shaped cover cylinder 4a incorporating a cylinder 10, and a first reinforcing bar 4b fixed to the upper surface or the lower surface of the cover cylinder 4a, and connects the wheel to the reinforcing member 5 via a rotating shaft. In the heavy load transport vehicle 200 shown in FIG. 11, two rows of reinforcing members 205 are fixed on both sides of the lower surface of the loading platform 1 in a parallel posture extending in the longitudinal direction of the loading platform 1. Furthermore, the reinforcing member 205 includes a first reinforcing bar 5b fixed to the lower surface of the cover cylinder 5a, and a second reinforcing bar 5c fixed to the side surface between the cover cylinder 5a and the first reinforcing bar 5b and on the side surface on the center side of the loading platform 1. This reinforcing member 205 connects the wheel 4 to the second reinforcing bar 5c via a rotating shaft 8.

[0105] The first reinforcing bar 5b and the second reinforcing bar 5c improve the strength and rigidity of the cover cylinder 5a from the surface fixed to the cover cylinder 5a respectively. Also, the structure in which the first reinforcing bar 5b and the second reinforcing bar 5c are fixed to the cover cylinder 5a to form the reinforcing material 205 makes it easy to use different materials or different cross-sectional shapes for each. 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).

[0106] Note that the heavy load carrier vehicle 200 can be provided 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 from below. By providing the side holder 15, the side edge portion of the loading platform 1 can be supported and held from below. The same applies to the following Embodiments 3 to 5.

[0107] (The first reinforcing bar 5b) The first reinforcing bar 5b shown in FIG. 11 is fixed to the lower surface of the cover cylinder 5a. The first reinforcing bar 5b improves the rigidity and strength of the cover cylinder 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 cylinder 5a. As the first reinforcing bar 5b, in addition to a flat plate, a square tube, a channel steel, a C-shaped steel (C-channel), etc., or a welded structure of two or more square tubes, C-shaped steels (C-channels), etc. can be used. The width of the cross-sectional shape of the first reinforcing bar 5b is set to a length corresponding to the width of the cover cylinder 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 optimum thickness according to the required degree of reinforcement, 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 the thickness of the cover cylinder 5a. By the first reinforcing bar 5b or the second reinforcing bar 5c described later reinforcing the cover cylinder 5a in a planar manner, the thickness of the cover cylinder 5a can be suppressed while maintaining the strength of the loading platform 1.

[0108] As shown in Fig. 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 chain line, a compressive force acts on the upper surface of the lateral frame 6, and a tensile force acts on the lower surface. In this state, a compressive force acts horizontally on the upper surface of the cover cylinder 5a in the direction shown by arrow B, and a tensile force acts on the lower surface of the cover cylinder 5a in the direction shown by arrow C. The forces acting on the upper and lower surfaces of the cover cylinder 5a are firmly supported by the first reinforcing bar 5b fixed to the upper or lower surface of the cover cylinder 5a.

[0109] The first reinforcing bar 5b is formed long by extending vertically in the longitudinal direction of the loading platform 1. As shown in Fig. 2, compared with the width (W) of the lateral frame 6 (the width of the loading platform 1 in the front-rear direction), the length (D) between the lateral frames 6 of the cover cylinder 5a is sufficiently long, so the force acting locally on the end of the lateral frame 6 is dispersed to the cover cylinder 5a and the first reinforcing bar 5b. For this reason, as shown in Fig. 10, the cover cylinder 5a has extremely high strength against the loads received from the lateral frame 6 in the directions of arrow B and arrow C, and firmly connects the lateral frames 6. For this reason, even though the lateral frame 6 is cut in the middle and connected by the cover cylinder 5a, the lateral frames 6 connected via the cover cylinder 5a have strength no less than that of a single straight lateral frame 6, and a tough loading platform 1 can be realized.

[0110] (The second reinforcing bar 5c) As shown in Fig. 11, the second reinforcing bar 5c is fixed to the side surfaces of the cover cylinder 5a and the first reinforcing bar 5b. By fixing the second reinforcing bar 5c to the side surfaces of the cover cylinder 5a and the first reinforcing bar 5b, the rigidity of the entire reinforcing member 205 can be increased together with the cover cylinder 5a and the first reinforcing bar 5b, and the strength against bending and distortion can be improved. As the second reinforcing bar 5c, in addition to a flat plate, a square tube shape, a C-shaped steel (C-channel), etc., or a welded structure of two or more square tube shapes, C-shaped steels (C-channels), etc. can be used.

[0111] Furthermore, as shown in FIG. 11, the second reinforcing bar 5c fixes the rotation axis 8 of the wheel 4. As shown in the figure, the wheel 4 is attached to the second reinforcing bar 5c via the rotation axis 8, and by fixing the second reinforcing bar 5c to the side surfaces of the cover cylinder 5a and the first reinforcing bar 5b, a plurality of wheels 4 are arranged at fixed positions on the loading platform 1. In this way, the second reinforcing bar 5c that connects the wheels 4 via the rotation axis 8 can be provided only on a part of the side surfaces of the cover cylinder 5a and the first reinforcing bar 5b, for example, the part that connects the wheels 4. The reinforcing member 205 shown in the figure is provided with a plurality of wheels 4 on its side surface, and these wheels 4 are connected to the rail 3. Therefore, the reinforcing member 205 arranges a plurality of wheels 4 at fixed positions by fixing a plurality of second reinforcing bars 5c to which the wheels 4 are connected via the rotation axis 8 to the side surfaces of the cover cylinder 5a and the first reinforcing bar 5b. However, the second reinforcing bar 5c can also be provided on a part of the entire side surface of the cover cylinder and the first reinforcing bar, or on a part of the side surface across the parts connecting the plurality of wheels 4. The second reinforcing bar 5c fixes a plurality of rotation axes 8 to which the wheels 4 are connected at a predetermined interval. Furthermore, the second reinforcing bar 5c can also be provided partially in two layers on a part of the side surface in addition to the entire side surface. The wheel 4 is connected to the loading platform 1 via the rotation axis 8 fixed to the side surface of the reinforcing member 205, and moves the loading platform 1 back and forth by running on the rail 3 fixed to the chassis 2.

[0112] In the heavy load carrier vehicle 200 shown in Fig. 11, since the rail 3 is arranged inside a pair of reinforcing members 205, the second reinforcing bar 5c to which the wheel 4 is connected is fixed inside the cover cylinder 5a. However, the second reinforcing bar 5c can also be provided outside the cover cylinder 5a. For example, in a structure where the rail 3 is arranged outside a pair of reinforcing members 205, the second reinforcing bar 5c to which the wheel 4 is connected is fixed to the outer side surfaces of the cover cylinder 5a and the first reinforcing bar 5b. Furthermore, although not shown, the second reinforcing bar 5c can also be provided on both side surfaces of the cover cylinder 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 surface via the rotation shaft 8, and the wheel 4 is not connected to the second reinforcing bar 5c fixed to the other side surface, or the wheel 4 can be provided on the second reinforcing bar 5c fixed to both side surfaces.

[0113] The second reinforcing bar 5c has an optimal thickness and size according to the required degree of reinforcement. The thickness and size of the second reinforcing bar 5c are designed so as to obtain 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, preferably 2 cm to 4 cm.

[0114] As described above, the heavy load carrier vehicle 200 connects the transverse frame 6 extending in the short side direction of the loading platform 1 and the reinforcing member 205 extending in the longitudinal direction of the loading platform 1 to each other and fixes them together to the loading platform 1 to reinforce the loading platform 1. The reinforcing member 205 arranges two rows of cover cylinders 5a extending in the longitudinal direction of the loading platform 1, and further, the first reinforcing bar 5b and the second reinforcing bar 5c are fixed to the cover cylinder 5a, and both reinforce the cover cylinder 5a in a planar manner to reinforce the loading platform 1. By connecting to each other and fixing to the loading platform 1 with the above structure, sufficient rigidity and strength can be ensured to prevent deformation of the loading platform 1 over a long period.

[0115] Furthermore, in the above-described heavy load carrier vehicle 200, the cylinder 10 is built into a strong square cylinder-shaped cover cylinder 5a, and the cover cylinder 5a is surface-reinforced by the first reinforcing bar 5b and the second reinforcing bar 5c, thereby preventing the cover cylinder 5a from deforming due to the weight of the loaded heavy load and achieving sufficient strength to withstand vibrations and impacts during loading / unloading and transportation. This enables the provision of a heavy load carrier vehicle in which the loading platform 1 can smoothly reciprocate back and forth by the cylinder 10 built into the cover cylinder 5a and has excellent durability. Moreover, while loading and transporting heavy loads on the loading platform 1 over a long period of time, deformation of the cylinder 10 is prevented, and contact between the cylinder 10 and the cover cylinder 5a is also prevented, realizing the feature that the loading platform 1 can smoothly reciprocate back and forth.

[0116] Although not shown in the drawings, in a heavy load carrier vehicle in which loading and unloading and transportation of heavy loads are repeated, in order to prevent deformation of the loading platform 1 over a long period of time, as necessary, between the lateral frames 6, between the cover cylinders 5a, and between the lateral frame 6 and the cover cylinder 5a are connected in the vertical, horizontal, or diagonal directions, or members that support and reinforce the loading platform 1 with a surface, polygon, or curved surface, etc. In addition to the lateral frames 6 and the reinforcing members 205, members that support and reinforce the loading platform 1 can also be fixed to the lower surface of the loading platform 1. The same applies to the following embodiments.

[0117] (Opposing 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 member 205 including the first reinforcing bar 5b and the second reinforcing bar 5c. The same applies to Examples 4 to 6 below. The opposing plate 5d can reinforce the lower surface of the reinforcing member 205 including the first reinforcing bar 5b. Also, it is possible to prevent a decrease in strength such as the lower surface of the reinforcing member 205 including the first reinforcing bar 5b coming into contact with and wearing against a part that supports the reinforcing member 205 such as the slip plate 13.

[0118] [Embodiment 3] FIG. 12 shows a schematic vertical cross-sectional view of a reinforcing member 305 of a heavy load carrier vehicle 300 according to Embodiment 3 of the present invention. In the reinforcing member 305 shown in this figure, the first reinforcing bar 305b has a square tube shape, and the first reinforcing bar 305b is fixed in surface contact with the lower surface of the cover cylinder 5a. By forming the first reinforcing bar 305b in a square tube shape, the reinforcing member 305 can be lightened while reinforcing the loading platform 1. At the corner portions of the first reinforcing bar 305b, the reinforcing strength can be improved, and in the flat portion, it can be welded and fixed in surface contact with the cover cylinder 5a, thereby reinforcing the cover cylinder 5a.

[0119] The height of the first reinforcing bar 305b can be easily adjusted. The first reinforcing bar 305b having a square tube shape has a thickness and a height that affect the strength of supporting and reinforcing the heavy load, and an optimum value is set according to the required degree of reinforcement. Also, the height of the loading platform 1 can be adjusted by the height of the first reinforcing bar 305b. The height of the first reinforcing bar 305b is, for example, 3 cm to 10 cm, preferably 4 cm to 7 cm.

[0120] Reinforcing surfaces, reinforcing blocks, reinforcing members, etc. that contact two or more inner surfaces of the square tube shape can be inserted into the first reinforcing bar 305b and can also be welded. The same applies to Embodiments 4 and 5 below.

[0121] [Embodiment 4] FIG. 13 shows a schematic vertical cross-sectional view of a reinforcing member 405 of a heavy load carrier vehicle 400 according to Embodiment 4 of the present invention. In the reinforcing member 405 shown in this figure, the first reinforcing bar 405b is composed of a pair of channel steels (channels) 405e whose opening edges are welded to each other. The pair of channel steels 405e has reinforcing ribs 405f that are bent inward along the opening edges. The pair of channel steels 405e has the reinforcing ribs 405f arranged in a vertical plane and welded to each other in surface contact. With the reinforcing ribs 405f of the channel steel 405e, the bending strength of the first reinforcing bar 405b can be improved, and the bending strength of the reinforcing member 405 can be further improved. Therefore, the reinforcing member 405 can reinforce the loading platform 1 more effectively, and the deformation of the loading platform 1 when loading a heavy load can be reduced more.

[0122] [Embodiment 5] FIG. 14 shows a schematic vertical cross-sectional view of a reinforcing member 505 of a heavy load carrier 500 according to Embodiment 5 of the present invention. The reinforcing member 505 shown in this figure is composed of two square tubular members 505g as the first reinforcing bar 505b, which are welded in a surface contact state with each other. By providing a reinforcing surface 505h in the longitudinal direction inside the first reinforcing bar 505b composed of the square tubular member 505g, the bending strength of the first reinforcing bar 505b is improved, so that the reinforcing member 505 can more effectively reinforce the loading platform 1 and reduce the deformation of the loading platform 1 when carrying heavy loads. The square tubular first reinforcing bar 505b with a longitudinal reinforcing surface inside can be easily manufactured and procured. Although not shown, the first reinforcing bar 505b can be composed of two or more square tubular members 505g. For example, the first reinforcing bar 505b composed of three square tubular members 505g, which are welded in a surface contact state with each other, can have two longitudinal reinforcing surfaces 505h inside. Also, two or more square tubular members 505g with different sizes can be provided inside and outside to form the first reinforcing bar 505b.

Industrial Applicability

[0123] The present invention can be effectively used as a heavy load carrier in which a loading platform that can prevent deformation of the loading platform over a long period and smoothly reciprocate back and forth while carrying heavy loads such as heavy machinery on the loading platform and has excellent durability.

Explanation of Reference Numerals

[0124] 100, 200, 300, 400, 500... Heavy load carriers 1... Loading platform 2... Chassis 3... Rail 4... Wheels 5, 205, 305, 405, 505... Reinforcing members 5a... Cover tube 5b, 305b, 405b, 505b... First reinforcing bars 5c... Second reinforcing bar 5d... Opposing plate 405e... Channel steel 405f... Reinforcing rib 505g... Square tubular member 505h... Reinforcing surface 6… Horizontal frame 6A… First frame 6B… Second frame 7… Slide holder 7A… Bent portion 8… Rotation axis 9… Outrigger 10… Cylinder 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… Driving 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 portion 33… Slip plate 35… Vertical frame

Claims

1. A loading platform that is movably connected to the chassis of a vehicle in the front-rear direction, A pair of rails that are fixed to the chassis and move the loading platform in the front-rear direction, Left and right wheels that are connected to the loading platform and run on the pair of rails to move the loading platform in the front-rear direction, A pair of cylinders having one end connected to the loading platform and being telescopic to move the loading platform in the front-rear direction, A drive mechanism that moves the pair of cylinders synchronously in the front-rear direction, Outriggers that tilt the chassis, A heavy load carrier vehicle with a loading platform that tilts, comprising: The loading platform has two rows of reinforcing members fixed to both sides of the lower surface in a parallel posture extending in the longitudinal direction of the loading platform, The reinforcing member includes a square cylinder-shaped cover cylinder containing the cylinder, The wheel is connected to the reinforcing member via a rotation axis, Furthermore, it includes a slide holder that is fixed to the chassis and supports the reinforcing member from below, The slide holder has a slip plate on the upper surface, The slip plate is on the upper surface of the slide holder and is disposed below the reinforcing member, The slide holder supports the reinforcing member that has moved at least rearward with the slip plate interposed between the slide holder and the reinforcing member, A heavy load carrier vehicle with a loading platform that tilts, characterized in that the reinforcing member fixed to the loading platform slides on the slip plate and moves back and forth.

2. A heavy load carrier vehicle with a loading platform that tilts according to Claim 1, The slip plate contains any one of resin, plastic, and rubber. A heavy load carrier vehicle with a loading platform that tilts.

3. A heavy load carrier vehicle with a loading platform that tilts according to Claim 1 or 2, The slip plate is made of a material with a lower coefficient of friction than when the slide holder and the reinforcing member directly touch each other with metal. A heavy load carrier vehicle with a loading platform that tilts.

4. A heavy load carrier vehicle with a loading platform that tilts according to any one of Claims 1 to 3, The cover cylinder has a connecting fitting connected to the tip of the rod of the cylinder. A heavy load carrier vehicle with a loading platform that tilts.

5. A heavy load carrier vehicle with a loading platform that tilts according to any one of Claims 1 to 4, A plurality of slide holders are arranged, The slide holder has the slip plate interposed between the slide holder and the reinforcing member, A heavy goods vehicle in which at least one of the slide holders has a platform that supports the reinforcing member and tilts within the range in which the reinforcing member moves back and forth.

6. A heavy goods vehicle with a tilting platform according to any one of claims 1 to 5, further characterized in that a counter plate is fixed to the lower surface of the reinforcing member.

7. A heavy goods vehicle with a tilting platform according to any one of claims 1 to 6, further comprising a side holder fixed to the chassis and extending in the lateral direction of the platform from the chassis, wherein the side holder supports the platform from below outside the reinforcing member.

8. A heavy goods vehicle with a tilting platform according to claim 7, wherein the side holder comprises a support frame having one end fixed to the chassis and the other end extended outside the reinforcing member, and a support base connected to the support frame and supporting the platform from below, and the platform has a protruding plate portion protruding downward at a position facing the support base, wherein the support base of the side holder supports the platform via the protruding plate portion and holds it in a fixed position.

9. A heavy goods vehicle with a tilting platform according to any one of claims 1 to 8, further comprising a first reinforcing bar fixed to the upper surface or the lower surface of the cover cylinder by the reinforcing member.

10. A heavy goods vehicle with a tilting platform according to claim 9, wherein the reinforcing member further comprises a second reinforcing bar fixed to the side surface of the cover cylinder and the first reinforcing bar, characterized in that the wheel is connected to the second reinforcing bar via a rotating shaft.

11. A heavy goods vehicle with a tilting platform according to claim 9 or 10, wherein the first reinforcing bar has a square tube shape or a channel steel.

12. A heavy goods vehicle with a tilting platform according to any one of claims 1 to 11, characterized in that a winch is arranged in front of the platform.

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