Running board device for construction machinery transport vehicle

Abstract

To provide a detachable running board device for a construction machine transport vehicle, which has a configuration in which a folded running board does not rub against the ground when it is opened in a straight line and which can reduce the weight of the running board. [Solution] The rung device 1 for a construction machinery transport vehicle is detachable from the rear end of the loading platform 21 of the construction machinery transport vehicle 2, and is composed of a rung 10, a mounting plate 14 to which the rung is rotatably attached, and a lifting cylinder 17 attached to the rung and mounting plate and used to raise and lower the rung. The rung is composed of a rear rung 12 attached to the mounting plate, a front rung 11 rotatably connected to the longitudinal end of the rear rung, and an opening / closing cylinder 13 attached to the front and rear rungs and used to open and close the front and rear rungs within a range in which the front and rear rungs are folded in a valley fold in the direction approaching the loading platform from a linearly opened state.

Description

[Technical Field]

[0001] The present invention relates to a running board for a vehicle (hereinafter referred to as a construction machine transporter) for transporting construction machines such as hydraulic excavators, wheel loaders, and bulldozers, and more particularly to a running board device for a construction machine transporter equipped with a foldable running board. [Background technology]

[0002] Generally, rungs are used to load and unload construction machinery transported by construction machinery carriers onto the loading platform. The heavier the construction machinery loaded onto the loading platform, the higher the load-bearing capacity of the rungs is required. Also, the longer the rungs, the gentler the slope becomes, improving work efficiency, so longer rungs are used. Rungs are made from materials with high strength and durability, but they are heavy, weighing 15 to 50 kg per rung and measuring 1.5 to 3 m, and for large construction machinery they can exceed 100 kg, making them difficult to handle.

[0003] Conventionally, a running board that can be raised or lowered freely using a hydraulic cylinder has been developed and attached to the bed of a construction machinery transport vehicle. Even heavy running boards can be easily moved using a hydraulic cylinder. However, in this case, the running board is stored in an upright position at the rear of the bed, which can make it difficult to move due to wind resistance while traveling, or it can come into contact with signs, trees, etc., causing problems. To solve this problem, a running board device for construction machinery transport vehicles has been developed that can automatically raise or lower the running board and fold it into two pieces.

[0004] For example, Patent Document 1 discloses a detachable running board device for a heavy-duty transport vehicle that can be divided into two parts in the front-to-rear direction for automatic folding and storage. According to this invention, a wire rope that passes through the butterfly section and stretches across the length of the running board is stretched on the side of the running board, which has the advantage that there is no risk of the construction machine getting caught on the wire rope when loading or unloading the construction machine.

[0005] Patent Document 2 discloses a running board for trucks that can be automatically raised and folded up. According to this invention, the running board is folded up short when stored, which has the advantage of reducing wind resistance while driving and eliminating the risk of contact with obstacles such as roadside tree branches or signs that protrude into the roadway. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Utility Model Registration No. 3035567 [Patent Document 2] Japanese Utility Model Application Publication No. 06-012181 Summary of the Invention [Problem to be solved by the invention]

[0007] Patent Documents 1 and 2 describe a running board device for a construction machinery transport vehicle that can automatically raise and fold the running board. However, these running boards are configured to fold in a mountain fold away from the loading platform. In this case, when the running board is opened in a straight line, the front part of the running board drops due to its own weight, and the leading edge of the running board may contact the ground before it is fully straightened. In this case, the leading edge of the running board may scrape and gouge the ground, causing damage to the ground. This may also damage the running board. In particular, on hard ground with many stones, this can cause significant damage to the running board, affecting its durability. Furthermore, in Patent Document 1, the running board device is configured to be detachable from the loading platform of a construction machinery transport vehicle, but if the running board is very heavy, it is difficult to handle when attaching or detaching it.

[0008] Therefore, there is a need for a running board device for a construction machinery transport vehicle that is configured so that when the running board is folded, it folds in a valley shape in the direction approaching the loading platform, and does not scrape the ground when opened in a straight line.Furthermore, there is a need for a running board device for a construction machinery transport vehicle that can reduce the weight of the running board and is easy to attach and detach, making it easy to work with.

[0009] In view of the above problems, the present invention aims to provide a detachable running board device for a construction machinery transport vehicle that is configured so that the folded running board does not scrape the ground when opened in a straight line and that allows the running board to be made lighter. [Means for solving the problem]

[0010] In order to solve the above problems, the present invention provides a running board device (1) for a construction machine transport vehicle (2) that can be attached to and detached from the rear end of a loading platform (21) of the construction machine transport vehicle (2), a mounting plate (14) detachably attached to the rear end of the loading platform (21); two left and right running boards (10, 10); and two lifting cylinders (17, 17) provided corresponding to the left and right running boards, respectively; It consists of each The running board (10) Furthermore, a rear running board (12) attached to the mounting plate (14); and a front running board (11) rotatably connected to a longitudinal end of the rear running board (12); and an opening / closing cylinder (13) attached to the front running board (11) and the rear running board (12), which opens and closes the front running board (11) and the rear running board (12) within a range in which they are folded in a valley fold in a direction approaching the loading platform (21) from a linearly opened state. The two running boards (10, 10) and the two lifting cylinders (17, 17) are rotatable via rotation shafts (16, 16) provided on the left and right sides of the mounting plate (14), and are attached so as to be slidable in the axial direction of each rotation shaft (16, 16). The front running board (11) and / or the rear running board (12) of each running board (10) are provided with support bases (110, 120). The contact surface of the support bases (110, 120) is flat, and the front running board (11) and / or the rear running board (12) are supported by the flat surface contacting the ground. A running board device (1) for a construction machinery transport vehicle. [Effects of the Invention]

[0011] The running board device for construction machinery transport vehicles does not damage the ground when the folded running board is unfolded in a straight line, so it does not scrape against the ground. Furthermore, since there is no damage to the running board, durability is improved. Furthermore, because the running board can be configured to be lightweight, it is easy to attach and detach from the loading platform, allowing for efficient work. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a perspective view showing a running board device for a construction machine transporter according to an embodiment of the present invention, attached to the rear end of the bed of the construction machine transporter. [Figure 2] FIG. 2 is a partially enlarged view of FIG. [Figure 3] 3 is a schematic diagram showing a contracted state of the lifting piston of FIG. 2.

[0023] FIG. [Figure 4]2 is a schematic diagram showing a state in which the running boards of the running board device for the construction machine transport vehicle of FIG. 1 are unfolded. FIG. [Figure 5] 2 is an explanatory view showing opening and closing of the rungs of the rung device for the construction machine transporter of FIG. 1. FIG. [Figure 6] 2 is a perspective view showing a state in which the running board device for the construction machine transporter of FIG. 1 has been removed from the rear end of the bed of the construction machine transporter. FIG. [Figure 7] FIG. 7 is a partially enlarged view of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, embodiments of the present invention (hereinafter referred to as examples) will be described with reference to the drawings. In the following drawings, common parts are given the same reference numerals, and duplicated explanations of parts with the same reference numerals will be omitted.

[0014] [Configuration of running board device 1 for construction machinery transport vehicle] The schematic configuration of a running board device 1 for a construction machinery transporter of this embodiment will be described with reference to Fig. 1. The construction machinery transporter 2 in Fig. 1 is a truck with a crane (a so-called vehicle with a Unic), but the construction machinery transporter 2 is not limited to this and may be other trucks, etc. The running board device 1 for a construction machinery transporter of this embodiment is configured to be detachable from the rear end of the loading platform 21 of the construction machinery transporter 2, and Fig. 1 shows the installed state.

[0015] The running board device 1 for a construction machinery transport vehicle is composed of a running board 10, a mounting plate 14 to which the running board 10 is rotatably attached, and a lifting cylinder 17 (hydraulic cylinder) that is rotatably attached to the running board 10 and the mounting plate 14 and that raises and lowers the running board 10 within a range from approximately horizontal to approximately vertical upward relative to the loading platform 21. Each component of the running board device 1 for a construction machinery transport vehicle will be described in detail below with reference to Figures 1 to 7.

[0016] The mounting plate 14 of the running board device 1 for a construction machinery transporter is formed so that it can be attached to the bed 21 of the construction machinery transporter 2, and is formed in an inverted L shape (upside down) on the top and rear surfaces of the rear end of the construction machinery transporter 2 (see Figures 6 and 7). A groove 220 into which the mounting plate 14 fits is formed in the rear end of the construction machinery transporter 2. Holes for passing multiple bolts 15 are arranged on the top and rear surfaces of the mounting plate 14, and holes for passing these bolts 15 are also provided in the rear end of the bed 21. The mounting plate 14 is removably fixed to the construction machinery transporter 2 by fastening the bolts 15 and nuts to the holes in the mounting plate 14 and the rear end of the bed 21 (see Figure 3).

[0017] As shown in Figures 1 and 2, the rear surface of the mounting plate 14 is provided with two running boards 10 at positions symmetrical to the left and right of the center, two rotating shafts 16 for rotatably holding them, and four bearings 161. In this embodiment, two running boards 10 are provided on the left and right to keep the weight of the running boards 10 as light as possible, but it is also possible to provide one running board in the center. In this embodiment, the left and right running boards 10 are configured to slide laterally on the rotating shafts 16, so the width of the left and right running boards 10 can be adjusted to match the width of the construction machine being loaded.

[0018] The rear surface of the mounting plate 14 is provided with two holders 18 that rotatably hold two lifting cylinders 17 that raise and lower the two running boards 10. In this embodiment, the base ends 171 of the lifting cylinders 17 are attached to one end of the holders 18, and the other ends are passed through the rotation shafts 16 of the running boards 10, so that they are rotatably and slidably held. This allows the lifting cylinders 17 to slide laterally along the rotation shafts 16 together with the running boards 10. The present invention is not limited to this embodiment, and the left and right running boards 10 and the lifting cylinders 17 may be configured so that they cannot slide along the rotation shafts 16.

[0019] The left and right running boards 10 have the same configuration, so only one of the running boards 10 will be described. Running boards 10 are made of a material with high load-bearing capacity (such as aluminum alloy or high-tensile steel), and as mentioned above, they weigh 15 to 50 kg and are approximately 2 to 3 m long, making them difficult to handle. Also, depending on the material of running board 10, it may not be easy to create a hole through which to pass rotation shaft 16. In this embodiment, running board 10 is rotatably attached to mounting plate 14 via running board holder 19, and lifting cylinder 17 is rotatably attached.

[0020] The running board holder 19 has a hole through which the rotating shaft 16 passes, and is rotatably and slidably held on the mounting plate 14. The tip (piston rod) 170 of the lifting cylinder 17 is also rotatably attached to it. By using the running board holder 19, there is no need to make a hole directly in the running board 10, and the running board 10 can be easily attached to the mounting plate 14 and the lifting cylinder 17 simply by fastening it to the running board holder 19. Note that the running board holder 19 is not essential to the present invention; a hole through which the rotating shaft 16 passes may be made directly in the running board 10, and the piston rod 170 of the lifting cylinder 17 may be attached to it.

[0021] The lifting cylinder 17 is connected to a hydraulic pump in the main body 20 of the construction machinery transporter 2. Operation of the hydraulic pump operates the lifting cylinder 17 to rotate and raise and lower the running board 10. In this embodiment, the running board 10 is raised and lowered by rotating around the rotation axis 16 within a range from approximately horizontal to approximately vertical upward relative to the loading platform 21. Figures 1 and 2 show a state in which the running board 10 is approximately vertical upward relative to the loading platform 21. This state is the state before or after construction machinery is loaded onto the loading platform 21 of the construction machinery transporter 2.

[0022] As shown in Figures 3 and 4, when the running board 10 is approximately horizontal with respect to the platform 21, the tip of the running board 10 touches the ground, forming a slope. In this embodiment, the front of the platform 21 is raised by a hydraulic cylinder of the construction machinery transporter 2, and the platform 21 is tilted to make it easier to load construction machinery. The slope of the running board 10 is formed so that the inclination angle is approximately the same as the inclination angle of the platform 21. This allows construction machinery to be loaded smoothly. When the present invention is used on a construction machinery transporter whose platform does not tilt, the running board 10 is raised or lowered within a range from approximately perpendicular upward relative to the platform 21 until the tip of the running board 10 touches the ground.

[0023] As shown in Figures 5(A) and (B), the running board 10 can be folded in two and is composed of a rear running board 12 and a front running board 11. The rear running board 12 is attached to an attachment board 14 (or running board holder 19). The front running board 11 is rotatably connected to the longitudinal end of the rear running board 12. The upper parts of the joint surfaces of the front running board 11 and the rear running board 12 are supported by a pivot 123, forming a rotatable connection (butterfly section). The front running board 11 and the rear running board 12 can be freely folded (opened and closed) around the pivot 123. As shown in Figure 5, the front running board 11 and the rear running board 12 are folded in a valley fold in the direction approaching the loading platform from a linearly opened state (A) to an overlapping state (B). In this embodiment, the joint surfaces of the front running board 11 and the rear running board 12 are formed in the shape shown in Figure 5 so that they can fit together, but the shape of the joint surfaces is not limited to the shape of this embodiment and can be any shape as long as they can fit together.

[0024] An opening / closing cylinder 13 is used to open and close the front rung 11 and the rear rung 12. The opening / closing cylinder 13 is connected to the hydraulic pump of the main body 20 of the construction machinery transport vehicle 2, just like the lifting cylinder 17. The base end 131 of the opening / closing cylinder 13 is connected near the joint surface of the rear rung 12, and the tip end (piston rod) 130 is connected near the joint surface of the front rung 11. The front rung 11 rotates around the pivot 123 by operation of the opening / closing cylinder 13, and rotates from a state in which it is folded over the rear rung 12 (closed state, see Figure 5(B)) to a state in which it is linear with respect to the rear rung 12 (open state, see Figure 5(A)).

[0025] As shown in Figures 5(A) and (B), the front rung 11 is provided with a support base 110, and the rear rung 12 is provided with a support base 120. A configuration in which a support base is provided on either the front rung 11 or the rear rung 12 may also be adopted. The support base 110 is provided on the back surface (surface facing the ground) of the front rung 11. The same is true for the support base 120. The contact surfaces (bottom surfaces) of the support bases 110, 120 are flat, and by the support bases 110, 120 contacting the ground, the front rung 11 and the rear rung 12 are stably supported.

[0026] In this embodiment, the support bases 110, 120 have the shape of a rhomboid placed on a plate material, and the surface opposite the flat surface (bottom surface) is an inclined surface. The inclination angle of this inclined surface is approximately the same as the inclination angle of the inclined surface formed by linearly opening the front rung 11 and the rear rung 12. The support bases 110, 120 are not limited to the shape of this embodiment, and may have any shape as long as they can stably support the front rung 11 and the rear rung 12.

[0027] By providing such supports 110, 120 on the undersides of the front rung 11 and the rear rung 12, the load on the front rung 11 and the rear rung 12 can be reduced. This allows the use of thin, light materials for the front rung 11 and the rear rung 12 themselves, resulting in weight reduction. In the case of foldable rungs in the prior art (Patent Documents 1 and 2), because they fold in a mountain fold when folded, it is not possible to provide a support on the underside of each rung. For this reason, in the prior art, thick, heavy materials are used for the rung itself.

[0028] Furthermore, by providing the supports 110, 120 on the undersides of the front rung 11 and the rear rung 12, when the front rung 11 and the rear rung 12 are opened in a straight line, the support 120 of the rear rung 12 first touches the ground, and then the front rung 11 opens, which has the advantage of not damaging the ground and at the same time not damaging the front rung 11. This improves the durability of the rung 10.

[0029] As shown in Figures 6 and 7, the running board device 1 for a construction machinery transporter can be removed using the crane 23 of the construction machinery transporter 2. Another crane may be used, or it can be removed using another construction machine. The running board device 1 for a construction machinery transporter is provided with locking portions 191 for hooking the rope 24, and the rope 24 is hooked onto these locking portions 191 to lift the running board. In this embodiment, the running board holders 19 of the left and right running boards 10 are each provided with a locking portion 191, so that the running board device 1 for a construction machinery transporter can be lifted in a balanced manner, as shown in Figure 6. The number and positions of the locking portions 191 are not limited to those in this embodiment and can be changed as appropriate.

[0030] As described above, a groove 220 into which the mounting plate 14 of the running board device 1 for a construction machinery transporter is fitted is formed at the rear end of the bed 21 of the construction machinery transporter 2. The rear surface of the mounting plate 14 (inverted L-shaped) fits into the groove 220 shown in FIG. 7, with its upper surface overlapping the upper surface of the rear end of the bed 21, and the mounting plate 14 is attached to the bed 21 of the construction machinery transporter 2 by tightening multiple bolts 15 (see FIG. 1). As shown in FIG. 7, the multiple bolts 15 are removed, and the running board device 1 for a construction machinery transporter is lifted with a crane, whereby the rear surface of the mounting plate 14 is disengaged from the groove 220 and its upper surface is disengaged from the upper surface of the rear end of the bed 21, allowing the entire device to be removed. In this way, the running board device 1 for a construction machinery transporter of this embodiment is configured to be easily attached to and detached from the construction machinery transporter 2.

[0031] This allows the running board device 1 for a construction machinery transport vehicle to be used only when necessary, making effective use of the space on the loading platform 21. Also, since it can be shared by multiple construction machinery transport vehicles 2, costs are reduced. Furthermore, since the running board device 1 for a construction machinery transport vehicle is not fixed, maintenance is easier.

[0032] [Operation of running board device 1 for construction machinery transport vehicle] The operation of the running board device 1 for a construction machinery transporter in this embodiment will be described. The procedure for loading a construction machine onto the construction machinery transporter 2 is as follows. First, the construction machinery transporter 2 is parked on ground that is as level and firm as possible. The running board device 1 for a construction machinery transporter is carried using the crane of the construction machinery transporter 2, and the mounting plate 14 is fitted into the groove 220 of the loading platform 21 as described above, and the multiple bolts 15 are tightened to secure the running board device 1 for a construction machinery transporter. The running board device 1 for a construction machinery transporter may be secured to the construction machinery transporter 2 in advance before moving and parking the vehicle. Alternatively, the hoses of the lifting cylinder 17 and the opening / closing cylinder 13 are connected to the hydraulic pump of the main body 20 of the construction machinery transporter 2. A separate hydraulic pump may be used instead of the hydraulic pump of the main body 20. Then, in this embodiment, the front of the loading platform 21 is lifted using the hydraulic cylinder of the construction machinery transporter 2, causing the loading platform 21 to tilt.

[0033] Since the distance between the left and right crawlers of the construction machinery (bulldozer, excavator, etc.) to be loaded onto the construction machinery transport vehicle 2 differs for each vehicle, the distance between the left and right running boards 10 is adjusted to fit each construction machinery. Specifically, the running board holder 19 that holds the running board 10 and the holder 18 of the lifting cylinder 17 are adjusted by sliding them along the rotation shaft 16.

[0034] As shown in FIG. 1, in the initial state of the running board device 1 for a construction machinery transport vehicle, the piston rod 170 of the lifting cylinder 17 is at its maximum length. At this time, the two running boards 10 are stored in an upright, overlapping state at the rear end of the loading platform 21. When the hydraulic pump is started, the piston rod 170 of the lifting cylinder 17 contracts, causing the running board 10 to rotate via the running board holder 19 connected to the piston rod 170. When the running board 10 has been rotated until it is approximately horizontal with respect to the loading platform 21, the piston rod 170 is at its minimum length (see FIG. 3). At this time, the inclination angle of the loading platform 21 and the inclination angle of the running board 10 are approximately the same. In this state, the hydraulic pump is stopped, and the operation of the lifting cylinder 17 is stopped.

[0035] At this time, the support base 120 of the rear rung 12 is in contact with the ground, and the front rung 11 is folded over the rear rung 12. As shown in FIG. 5(B), the piston rod 130 of the opening / closing cylinder 13 connected to the front rung 11 and rear rung 12 is at its maximum length. When the hydraulic pump is started, the piston rod 130 of the opening / closing cylinder 13 contracts, causing the front rung 11 connected to the piston rod 130 to rotate. The front rung 11 is rotated until it is in a linearly opened position relative to the rear rung 12 (FIG. 5(A)). At this time, the support base 110 of the front rung 11 is in contact with the ground, and the front rung 11 and rear rung 12 unfold, forming a slope. In this state, the hydraulic pump is stopped, and the operation of the opening / closing cylinder 13 is stopped.

[0036] The construction machinery is then loaded onto the platform 21 of the construction machinery transport vehicle 2 via the slope of the two runs 10. After the construction machinery is loaded, the procedure for storing the two runs 10 is carried out in the reverse order of deployment. First, the hydraulic pump is started, and the front rung 11 connected to the piston rod 130 of the opening / closing cylinder 13 is rotated as the piston rod 130 extends. The front rung 11 is rotated from a state in which it is opened linearly relative to the rear rung 12 until it is folded in a valley fold in the direction approaching the platform 21. After the piston rod 130 of the opening / closing cylinder 13 reaches its maximum length and the front rung 11 is folded over the rear rung 12 (Figure 5(B)), the hydraulic pump is stopped and the operation of the opening / closing cylinder 13 is stopped.

[0037] In this state, the two rungs 10 are approximately horizontal to the platform 21, and the piston rods 170 of the lifting cylinders 17 are at their minimum length. When the hydraulic pump is started, the piston rods 170 of the lifting cylinders 17 extend, causing the rungs 10 to rotate via the rung holders 19 connected to the tips of the piston rods 170. When the rungs 10 have been rotated until they are approximately perpendicular to the platform 21, the piston rods 170 reach their maximum length, and the two rungs 10 are erected at the rear end of the platform 21 in an overlapping state. The hydraulic pump is stopped, and the operation of the lifting cylinders 17 is stopped. The front of the platform 21 is then lowered by the hydraulic cylinders of the construction machinery transporter 2, returning the platform 21 to a horizontal position.

[0038] This is how the running board device 1 for a construction machinery transporter is used. In this embodiment, the work of loading a construction machine onto the construction machinery transporter 2 has been described, but the work of unloading (unloading) can also be performed by activating the running board device 1 for a construction machinery transporter in the same way as when loading.

[0039] As explained above, the running board device for a construction machine transport vehicle of the present invention is designed so that the folded running board does not scrape against the ground when it is opened in a straight line, so it does not damage the ground. Since no damage occurs to the running board, durability is improved. Furthermore, the running board can be made lightweight, making it easy to attach and detach from the loading platform. Furthermore, the running board can be easily slid sideways, allowing for efficient work.

[0040] The above-described running board device for a construction machine transport vehicle is one example, and its configuration can be modified as appropriate within the scope of the invention. [Explanation of symbols]

[0041] 1...walking board device for construction machinery transport vehicle, 2...construction machinery transport vehicle, 10...walking board, 11...front walking board, 12...rear walking board, 13...opening / closing cylinder, 14...mounting plate, 15...bolt, 16...rotating shaft, 17...lifting cylinder, 18...lifting cylinder holding part, 19...walking board holding part, 20...main body of construction machinery transport vehicle, 21...loading platform, 23...crane, 24...rope, 110, 120...support base, 123...pivot, 130...tip part (piston rod) of opening / closing cylinder, 131...base end part (piston end) of opening / closing cylinder, 161...bearing, 170...tip part (piston rod) of lifting cylinder, 171...base end part (base end) of lifting cylinder, 191...locking part, 220...groove.

Claims

[Claim 1] A running board device (1) for a construction machinery transport vehicle (2) that can be attached to and detached from the rear end of the loading platform (21) of the construction machinery transport vehicle (2), A mounting plate (14) that is detachably attached to the rear end of the loading platform (21); Two stepping boards (10, 10) on the left and right, Two lifting cylinders (17, 17) provided corresponding to the left and right running boards, It consists of Each of the running boards (10) further comprises: a rear running board (12) attached to the mounting board (14); a front running board (11) rotatably connected to a longitudinal end of the rear running board (12); an opening / closing cylinder (13) attached to the front running board (11) and the rear running board (12), which opens and closes the front running board (11) and the rear running board (12) within a range in which they are folded in a valley fold in a direction approaching the loading platform (21) from a linearly opened state; It consists of The two walking plates (10, 10) and the two lifting cylinders (17, 17) are rotatable via rotation shafts (16, 16) provided on the left and right sides of the mounting plate (14), and are attached so as to be slidable in the axial direction of each rotation shaft (16, 16); A running board device (1) for a construction machinery transport vehicle, characterized in that the front running board (11) and / or the rear running board (12) of each running board (10) are provided with support bases (110, 120), the contact surface of the support bases (110, 120) is flat, and the front running board (11) and / or the rear running board (12) are supported by the flat surface coming into contact with the ground.

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