Agricultural trailer

Abstract

To solve an issue of protecting a fixing means from a vibration occurring during drive.SOLUTION: The present invention solves an issue by an agricultural trailer that includes a machine frame, an open / close panel, a fixing device, and a tension device. The machine frame includes a rotational shaft. The open / close panel is rotational between a close state where the panel stands up via the rotational shaft provided in the machine frame, and an open state where the panel opens outward from the machine frame. The fixing device fixes the open / close panel in a standing state. The tension device includes a tension member, an open / close panel-side attachment, and a machine frame-side attachment. The tension member connects the open / close panel-side attachment and the machine frame-side attachment in a manner of being freely tensed and relaxed.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to an agricultural trailer. Background Art

[0002] In the agricultural field, agricultural trailers attached to traveling vehicles such as tractors are used. Agricultural working machines such as combine harvesters and harvested products are loaded on the cargo bed of an agricultural trailer, and transported by traveling on public roads. Prior Art Documents Patent Documents

[0003] Patent Document 1 Japanese Patent No. 7098492 Summary of the Invention Problems to be Solved by the Invention

[0004] Some are configured such that a walk board is openably and closably attached to the rear side of the cargo bed. Further, some are configured such that an upright rear plate opens by falling rearward. The walk board and rear plate of the cargo bed are upright and fixed during traveling. The cargo bed has openable and closable plates provided around the cargo bed, such as a walk board, a rear plate, and side plates, which are openably and closably fixed, so that loading and unloading of conveyed articles loaded on the cargo bed can be easily performed.

[0005] These plates are erected so as to surround the periphery of the cargo bed during traveling, and are fixed so as not to interfere with traveling. For fixing the rotatably attached plate to the cargo bed, a fixing device using a lock pin has been conventionally used. For example, as a device for fixing the rear plate of the cargo bed to some member to prevent rotation, a fixing device that connects the rear plate and a member to be fixed (for example, a machine frame) with a lock pin through an insertion hole has been used.

[0006] However, the ramps (opening / closing ramps) vibrate violently when the truck bed travels over uneven terrain, moving independently of the machine frame. Components connecting the ramps (opening / closing ramps) to the machine frame, such as the ramp pivot shaft and fixing devices, are particularly affected by vibration. This is because mechanical play is necessary between the components connecting the rear ramp and the machine frame, such as the ramp pivot shaft and fixing devices, and vibration causes the parts connecting the rear ramp and the machine frame to move in different directions. The components connecting the rear ramp and the machine frame end up colliding with each other due to the movement caused by vibration. In particular, fixing devices that use lock pins connect the rear ramp and the machine frame by inserting the lock pins into through holes, and vibration causes the lock pins to hit the through holes hard, gradually widening the holes. As the through holes widen, the range of relative movement that the machine frame and the rear ramp can move increases, causing the through holes to widen even further.

[0007] If part of the insertion hole breaks, causing the locking pin to become ineffective or to fall out, it could lead to the rear plate collapsing while driving. The present invention aims to protect the fastening means from vibrations that occur during driving. [Means for solving the problem]

[0008] The present invention solves the problem by providing an agricultural trailer comprising a machine frame, an opening / closing plate, a fixing device, and a tension device, wherein the machine frame has a pivot shaft, the opening / closing plate can rotate to a closed state by being raised and to an open state by being raised toward the outside of the machine frame via the pivot shaft provided on the machine frame, the fixing device fixes the opening / closing plate in the raised state, and the tension device comprises a tension member, an opening / closing plate side mounting part, and a machine frame side mounting part, the tension member connects the opening / closing plate side mounting part and the machine frame side mounting part in a manner that allows for flexible tensioning and relaxation. [Effects of the Invention]

[0009] With this invention, the fixing means for the opening and closing plate will no longer break due to vibrations that occur during operation. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is an explanatory diagram of an agricultural trailer according to an embodiment, where Figure 1(A) is a perspective view of the agricultural trailer and Figure 1(B) is a side view. Figure 1(C) is a plan view showing the trailer with the floor material and components for attaching the floor material removed from the cargo bed, leaving only the machine frame. [Figure 2] Figure 2 is an explanatory diagram of the components near the pivot axis of the ramp. Figure 2(A) is an enlarged view of the area near the pivot axis of the ramp as seen from the rear. Figure 2(B) is an enlarged view of frame A area attached to Figure 2(A). Figure 2(C) is an enlarged view of frame B area attached to Figure 2(B) and a plan view of the opening / closing plate interlocking plate. [Figure 3] Figure 3 is a cross-sectional view of the section aa shown in Figure 2(B), and represents the tensioning device. [Figure 4] Figure 4 is an explanatory diagram of the flooring material. Figure 4(A) is a plan view of the loading platform 2, and the ramps and base are not shown for illustrative purposes. Figure 4(B) is a cross-sectional view of Figure 4(A) between b and bb. [Figure 5] Figure 5 shows an enlarged and exploded view of frame C attached to Figure 4(B), illustrating the single-sided retaining member on the front of the cargo bed. [Figure 6] Figure 6 is an enlarged and exploded view of frame E shown in Figure 4(B), illustrating the single-sided retaining member at the rear of the cargo bed. [Figure 7] Figure 7 shows an enlarged and exploded view of frame D attached to Figure 4(B), illustrating the retaining members on both sides of the center of the cargo bed. [Figure 8] Figure 8 is an explanatory diagram of a first modified example of the double-sided retaining members. [Figure 9] Figure 9 is an explanatory diagram of a second modified example of the double-sided retaining members. [Modes for carrying out the invention]

[0011] Embodiments of the present invention will be described below with reference to the drawings. In the following description, the same reference numerals in different figures indicate parts with the same function, and redundant explanations in each figure will be omitted as appropriate.

[0012] [Examples] The agricultural trailer 1 of the embodiment is a transporting agricultural trailer 1 for transporting transported articles 23 (combines) and the like, and is towed by a traveling vehicle 15 such as a tractor. It should be noted that the transporting agricultural trailer 1 of the embodiment is merely an illustrative example for description, and the present invention is a technology that can also be applied to an agricultural trailer 1 that transports harvested crops.

[0013] FIG. 1 is an explanatory view of the agricultural trailer 1 of the embodiment, where FIG. 1(A) is a perspective view of the agricultural trailer 1, FIG. 1(B) is a side view, and FIG. 1(C) is a plan view. A base 13 is provided at the front portion of the agricultural trailer 1, so that the agricultural trailer 1 can be connected to a traveling vehicle 15 such as a tractor. At the rear portion of the agricultural trailer 1, a footboard 3 (opening / closing plate), which is used when loading a transported article 23 (combine) onto the cargo bed 2, is provided so as to be rotatable to an open state opening toward the outside of a rear frame 253C (machine frame 25).

[0014] As illustrated in FIG. 1(B), a dump cylinder 12 is attached between the base 13 and the cargo bed 2. The dump cylinder 12 drawn with a solid line indicates a non-operating state, and the dump cylinder 12 drawn with a broken line indicates a state where the cargo bed 2 is tilted. The cargo bed 2 can be tilted by the dump cylinder 12 about a rotating shaft (not shown) provided between the two tires 11 such that the rear portion of the cargo bed becomes lower.

[0015] The footboard 3 at the rear portion of the cargo bed 2 opens and closes around a footboard rotating shaft 321, and is used when loading the transported article 23 (combine) onto the cargo bed 2. As illustrated in FIG. 1(B), a gas spring 312 is disposed on the lower surface of the rear portion of the cargo bed 2. The function of the gas spring 312 will be described later.

[0016] FIG. 1(C) is a plan view showing a state in which the floor material 5 and the members for attaching the floor material 5 are removed from the cargo bed 2, leaving only the machine frame 25. The machine frame 25 is broadly divided into a cargo bed frame 253 (machine frame) that forms the cargo bed 2 and a main frame member 252 (machine frame). The cargo bed frame 253 (machine frame) tilts around a rotating shaft (not shown) provided between the two tires 11. Two main frame members 252 (machine frame) are attached to the left and right on the lower surface side of the cargo bed 2. The main frame member 252 (machine frame) is divided into two parts, a front side and a rear side, and the rear main frame member 252 (machine frame) can tilt together with the cargo bed 2. The front main frame member 252 (machine frame) is connected to the machine base of the tire 11. The front and rear main frame members 252 (machine frame) are connected by the rotating shaft (not shown) provided between the two aforementioned tires 11, and allow the rear main frame member 252 (machine frame) to move together with the cargo bed 2 by the dump cylinder 12.

[0017] (Cargo bed frame) The cargo bed frame 253 (machine frame) is composed of a rectangular frame formed by a pair of left and right side frames 253A, a front frame 253B and a rear frame 253C, and horizontal cross rails 254. A plurality of the horizontal cross rails 254 are fixed between the pair of left and right side frames 253A. The floor material 5 is placed on the horizontal cross rails 254, and the horizontal cross rails 254 function to support the floor surface.

[0018] (Members near the rotating shaft of the step board (opening / closing plate)) The step board 3 of the embodiment is shown as an example of an opening / closing plate. An opening / closing plate may be attached to a side surface like the cargo bed 2 of a truck, and the step board 3 is one example of an opening / closing plate. At the lower end of the step board 3 (opening / closing plate), a step board rotating shaft 321 is attached between the step board 3 and the rear frame 253C, and the step board 3 (opening / closing plate) opens and closes relative to the rear frame 253C. FIG. 2 is an explanatory view of members near the step board rotating shaft 321. FIG. 2(A) is an enlarged view of the vicinity of the step board rotating shaft 321 as viewed from the rear side. FIG. 2(B) is an enlarged view of the area enclosed by frame A shown in FIG. 2(A). FIG. 2(C) is an enlarged view of the area enclosed by frame B shown in FIG. 2(B) and a plan view of the opening / closing plate interlocking plate 333. Figure 2(A) shows the lower part of one of the ramps 3 (opening / closing ramps) attached to the rear of the cargo bed 2. The ramp pivot shaft 321 is provided in three locations at the lower end of the ramp 3 (opening / closing plate). One of the pivot fittings 32A is the ramp-side pivot fitting 32A and is fixed to the lower end of the ramp 3 (opening / closing plate), while the other pivot fitting 32B is the rear frame-side pivot fitting 32B and is fixed to the rear frame 253C. The ramp-side pivot fitting 32A and the rear frame 253C-side pivot fitting 32B are rotatably connected by the ramp pivot shaft 321. There are three ramp pivot axes 321, and the ramp pivot axis 321 on the right side has the structure described above.

[0019] (Gas spring) The central ramp pivot shaft 321 has a fitting 31 added to the basic ramp pivot shaft 321 described above, and the fitting 31 moves in conjunction with the rotation of the ramp 3 (opening / closing plate). One end of the gas spring 312 is attached to an appropriate location on the machine frame 25. Although not shown in the figure, one end of the gas spring 312 is on the underside of the loading platform 2 and attached to the crossbar 254 of the machine frame 25. The other end of the gas spring 312 is attached to the lower end of the fitting 31, as shown in Figure 2(B). The ramp 3 (opening / closing plate) is heavy, and when the worker opens the ramp 3 (opening / closing plate), the fitting 31 moves in conjunction with the movement of the ramp 3 (opening / closing plate) in a direction that compresses the gas spring 312. When the gas spring 312 is compressed, it supports part of the weight of the ramp 3 (opening / closing plate), and the worker can open the ramp 3 (opening / closing plate) as if it had become lighter. When the ramp 3 (opening / closing plate) is opened, the compressed gas spring 312 stores force, and this stored force is used to assist when closing (lifting) the ramp 3 (opening / closing plate).

[0020] (Fixing device) The left-side ramp pivot axis 321 shown in Figure 2(A) is more complex than the other ramp pivot axes 321. Figure 2(C) is an explanatory diagram of the fixing device 33, and the tension device 34 shown in Figure 2(B) is not shown for illustrative purposes. The basic structure of the walkway pivot shaft 321 is the same as that of the other walkway pivot shafts 321. The rotating fitting 32A on the walkway side is attached to the lower end of the walkway 3. The rotating fitting 32B on the rear frame 253C side has a left side that serves as both the left frame fixing plate 331L of the fixing device 33 and the frame-side mounting portion 342 of the tension device 34. An engaging rod 346, which forms part of the frame-side mounting portion 342 of the tension device 34, is fixed to the lower end of the left frame fixing plate 331L. Furthermore, the right side of the rotating fitting 32B on the rear frame 253C side also serves as the right frame fixing plate 331R of the fixing device 33.

[0021] The fixing device 33 is primarily a device that fixes the ramp 3 (opening / closing plate) in the closed position. In this embodiment, the fixing device 33 can also be fixed when the ramp 3 (opening / closing plate) is open, that is, when it is used as a ramp for loading the transported goods 23 (combine harvester) onto the loading platform 2. Depending on the intended use of the agricultural trailer 1, the fixing device 33 may be configured to be fixed not only when the opening / closing plate is open, but also in an intermediate position.

[0022] The fixing device 33 consists of a left frame fixing plate 331L (which also serves as the frame-side mounting portion 342 of the tension device 34), a right frame fixing plate 331R, an opening / closing plate interlocking plate 333, and a fixing pin 332. The left frame fixing plate 331L and the right frame fixing plate 331R also serve as the rotating fitting 32B on the rear frame 253C side and are welded to the rear frame 253C. The left frame fixing plate 331L is provided with a third hole 3313, and the right frame fixing plate 331R is provided with a fourth hole 3314, and the fixing pin 332 is inserted through the third hole 3313 and the fourth hole 3314.

[0023] The fixing pin 332 has a threaded portion 3321 in its middle section. The fixing pin 332 moves forward and backward by rotating. The end of the fixing pin 332 is bent and serves as a gripping portion 3322 when the fixing pin 332 is rotated. By grasping the gripping portion 3322 and rotating the fixing pin 332, the operator can advance the tip 3323 of the fixing pin 332 in the direction of the opening / closing plate interlocking plate 333.

[0024] The opening / closing plate interlocking plate 333 has its upper part welded to the walkway plate 3 (opening / closing plate) and is a component that moves in conjunction with the rotation of the walkway plate 3. The opening / closing plate interlocking plate 333 is provided with a first hole 3331 and a second hole 3332 for inserting a fixing pin 332. The first hole 3331 is positioned so that the tip 3323 of the fixing pin 332 can be inserted when the walkway plate 3 (opening / closing plate) is in the closed state (upright state). The second hole 3332 is positioned so that the tip 3323 of the fixing pin 332 can be inserted when the walkway plate 3 (opening / closing plate) is open.

[0025] When the walkway 3 (opening / closing plate) is in the closed position (up position), the operator can rotate the fixing pin 332 and insert it through the first hole 3331 of the opening / closing plate interlocking plate 333 to fix the walkway 3 (opening / closing plate) in the closed position (up position). Furthermore, when the ramp 3 (opening / closing plate) is in the open (downward) position, the worker can rotate the fixing pin 332 and insert it through the second hole 3332 of the opening / closing plate interlocking plate 333 to fix the ramp 3 (opening / closing plate) in the open (downward) position.

[0026] (Tension device) As mentioned above, the fixing device 33 can fix the walkway 3 (opening / closing plate) in the closed state (raised state) by inserting the fixing pin 332 through the first hole 3331, the third hole 3313, and the fourth hole 3314. At first glance, the ramp 3 (opening / closing plate) appears to be securely fixed by the fixing device 33. However, as explained in the previous technology section, the fixing device 33 requires mechanical play and is affected by vibrations when the agricultural trailer 1 is in motion.

[0027] The walkway 3 (opening / closing plate) is a heavy object and is fixed in an unstable closed (up) state. If we consider the upper end of the walkway 3 (opening / closing plate) as the point of force application and the walkway pivot shaft 321 as the fulcrum, then the first hole 3331 provided in the opening / closing plate interlocking plate 333 of the fixing device 33 becomes the point of application. The swaying of the upper end of the walkway 3 (opening / closing plate) that occurs during travel is amplified into a strong force due to the lever principle. Due to mechanical play, the fixing pin 332 and the first hole 3331, which move together with the machine frame 25 (rear frame 253C), collide with each other due to the movement accompanying the vibration, gradually widening the diameter of the first hole 3331. Furthermore, the movement of the engine frame 25 (rear frame 253C) is caused by unevenness in the road surface, so it has no directionality and moves in any direction. Because the movement of the first hole 3331 caused by the movement (forward and backward direction) of the upper end of the walkway plate 3 (opening / closing plate) during operation and the movement of the fixing pin 332 which is linked to the movement of the machine frame 25 (rear frame 253C) (in all directions) are different, the first hole 3331 expands without any directionality.

[0028] (Tension device) Figure 3 is a cross-sectional view of the section aa shown in Figure 2(B), and represents the tensioning device 34. The tension device 34 includes an opening / closing plate side mounting portion 341 and a machine frame side mounting portion 342. The tension device 34 has a structure that connects the opening / closing plate side mounting portion 341 and the machine frame side mounting portion 342 with a tension member that can be freely relaxed and tightened. In this embodiment, the tension member is a turnbuckle 344, and by rotating the turnbuckle 344 (tension member), it can be put into a tensioned state or a relaxed state. Furthermore, by removing either the opening / closing plate side mounting portion 341 or the machine frame side mounting portion 342 and the turnbuckle 344 (tension member), it is possible to instantly switch from a tensioned state to a relaxed state.

[0029] As mentioned above, the frame-side mounting portion 342 of the turnbuckle 344 (tension member) also serves as the frame-side rotating fitting 32B to which the left frame fixing plate 331L of the fixing device 33 and the walkway pivot shaft 321 are attached. The engaging rod 346, which constitutes part of the frame-side mounting portion 342, is attached to the frame-side mounting portion 342. In addition, the walkway 3 (opening / closing plate) is firmly fixed by welding at the opening / closing plate side mounting portion 341. There are two opening / closing plate side mounting portions 341, one above and one below. The upper opening / closing plate side mounting portion 341 is used when the walkway 3 (opening / closing plate) is open (down). The opening / closing plate side mounting portion 341 used when the walkway 3 (opening / closing plate) is closed (up) is located below, as shown in Figure 3. The mounting portion 341 on the opening / closing plate side is the part where the chain 343 of the turnbuckle 344 (tension member) engages.

[0030] A turnbuckle 344 (tension member) connects the opening / closing plate side mounting portion 341 and the machine frame side mounting portion 342 (engagement rod 346). The wing nut 345 prevents the turnbuckle 344 (tension member) from loosening, and by rotating the wing nut 345 to tighten it, a strong tension can be maintained. In addition, the tension can be increased or decreased by rotating the main body of the turnbuckle 344 (tension member).

[0031] The walkway 3 (opening / closing plate) and the machine frame 25 (rear frame 253C) are connected by the walkway pivot shaft 321. When the walkway 3 (opening / closing plate) is closed (raised), the tension device 34 connects the machine frame 25 (rear frame 253C) and the walkway 3 (opening / closing plate) in a state of tension, working as if they were one unit. In other words, even if there is a slight amount of play in the walkway pivot shaft 321, because tension is applied, the walkway pivot shaft 321 does not move due to vibrations during operation and is always restrained in the same position.

[0032] Furthermore, while the machine is in motion, the fixing pin 332, which is indirectly supported by the machine frame 25 (rear frame 253C) of the fixing device 33, is inserted into the first hole 3331 of the opening / closing plate interlocking plate 333, which is indirectly supported by the walkway plate 3 (opening / closing plate). The tension device 34 restrains the fixing pin 332 so that it does not move at all, even if there is some play between the fixing pin 332 and the first hole 3331. In this way, the tension device 34 restrains the movement of the fixing pin 332 and the first hole 3331 even if there is vibration during operation. As a result, the tensioning device 34 can suppress the movement of the first hole 3331 and the fixing pin 332 of the fixing device 33, preventing the problem of the hole diameter of the first hole 3331 widening due to collision with each other.

[0033] Furthermore, the tension device 34 restrains not only the movement of the fixing device 33 but also the movement of the walkway pivot shaft 321, eliminating the inherent mechanical play in both devices. The tension device 34 prevents the walkway 3 (opening / closing plate) from moving relative to the machine frame 25 (rear frame 253C) even when subjected to vibration, thereby protecting the fixing device 33.

[0034] Up to this point, we have explained, using examples, how the tensioning device 34 prevents problems that occur in the fixing device 33 due to vibration. The fixing device 33 is used to fix the machine frame 25 to the walkway 3 (opening / closing plate). In principle, it is impossible to eliminate the mechanical play between the member of the fixing device 33 on the machine frame 25 side and the member of the fixing device 33 on the walkway plate 3 (opening / closing plate) side. However, the tension device 34 of the present invention can, in principle, fix the rotating member on the walkway plate 3 (opening / closing plate) side to the member on the machine frame 25 side of the fixing device 33, regardless of the type or mechanism of the fixing device 33. Therefore, the tensioning device 34 is also effective for fixing devices 33 of a different type than the fixing device 33 shown in the embodiment.

[0035] The ramp 3 in the above-described embodiment was one example of an opening / closing plate. Some agricultural trailers 1 have a rear plate (not shown) or a side plate (not shown) of the cargo bed 2 as opening / closing plates instead of the ramp 3. The rear plate (opening / closing plate) and side plate (opening / closing plate) are opened when loading or unloading cargo onto the cargo bed 2 from the rear or side. Similar to the embodiment, the rear plate (opening / closing plate) and side plate (opening / closing plate) are fixed by the fixing device 33 when the agricultural trailer 1 is in motion. The tension device 34 of the embodiment can also be applied to the rear plate (opening / closing plate) and side plate (opening / closing plate).

[0036] (Variations of tension devices) The tensioning device 34 can be any device that connects the opening / closing plate side mounting portion 341 and the machine frame side mounting portion 342 in a way that allows for flexible tensioning and loosening, and is not limited to a turnbuckle 344. For example, a spring can connect members in a way that allows for flexible tensioning and loosening. Also, if a hydraulic cylinder is used as the tensioning device 34, the connection between the opening / closing plate side mounting portion 341 and the machine frame side mounting portion 342 can be automatically tensioned when the fixing device 33 is used as a trigger. The fixing device 33 and the tensioning device 34 function effectively even if their principles differ from those of the embodiment.

[0037] (Flooring) Figure 4 is an explanatory diagram of the flooring material 5. Figure 4(A) is a plan view of the loading platform 2, and the ramps 3 and base 13 are not shown for illustrative purposes. Figure 4(B) is a cross-sectional view of Figure 4(A) between b and bb. The flooring material 5 is densely arranged on top of the crossbars 254 that make up the machine frame 25. The flooring material 5 consists of wooden flooring material 54 and metal flooring material 55. The metal flooring material 55 is a single plate that extends over the entire length of the loading platform 2 in the front-to-rear direction. Because the metal flooring material 55(5) is highly durable, it is directly fastened to the crossbars 254 (machine frame 25). The metal flooring material 55(5) serves to regulate the position of the floor in the width direction and is fastened to the horizontal rail 254 (machine frame 25), and therefore also becomes part of the machine frame 25. In the embodiment described later, the metal flooring material 55(5) is also used as part of the machine frame 25 to which the retaining members (double-sided retaining members 51A and single-sided retaining members 51B) to which the wooden flooring material 54 is attached are fixed with fixing members 57.

[0038] The wooden flooring material 54(5) is divided into a front wooden flooring material 54(5) and a rear wooden flooring material 54(5), covering the floor surface of the cargo bed 2. Double-sided retaining members 51A are attached between the front wooden flooring material 54(5) and the rear wooden flooring material 54(5), holding down the ends of the wooden flooring material 54(5). The ends 56 of each of the front and rear wooden flooring materials 54(5) are held down by single-sided retaining members 51B attached in close proximity to the front frame 253B and the rear frame 253C.

[0039] Since the wooden flooring 54(5) is less durable than the metal flooring 55(5), it is attached to the cargo bed 2 with a single-sided retaining member 51B or a double-sided retaining member 51A. The durability of the resin flooring varies depending on the material, and depending on the durability, it is possible to choose whether to attach it like the wooden flooring 54(5) or like the metal flooring 55(5).

[0040] Figure 5 is an enlarged and exploded view of frame C shown in Figure 4(B), illustrating the single-sided retaining member 51B on the front of the cargo bed 2. There are two types of retaining members that hold down the edge of the flooring material 5 in the embodiment, but the one with the retaining portion 511 on only one side is the one-sided retaining member 51B.

[0041] (One-sided retaining member on the front of the cargo bed) The flooring material 5 attached by the one-sided retaining member 51B in this embodiment is a wooden flooring material 54. Hereafter, the flooring material 5 will be described as a wooden flooring material 54. The wooden floorboards 54 on the loading platform 2 are closely arranged on top of the multiple crossbars 254 that make up the machine frame 25. The wooden floorboard 54 is divided into two sections, front and rear. The end 56 of the wooden floorboard 54 on the front side of the loading platform 2 is held down by the single-sided holding member 51B shown in Figure 5. "Holding down" the end 56 of the wooden floorboard 54 means holding it down in order to fix it in place. In this embodiment, the wooden floorboard 54 is held down toward the machine frame 25 below. The upper surface of the end 56 of the wooden floorboard 54, or the edge 561 of the end 56 of the floorboard, is suitable for holding it down toward the machine frame 25 below. The area surrounding the part pressed down by the pressing portion 511 is the end portion 56. Of course, the upper surface of the wooden flooring material 54 that is directly covered by the pressing portion 511 in this embodiment is also the end portion 56. However, not only the upper surface of the wooden flooring material 54, but also the area below the upper surface, contacts the machine frame 25, contributing to the fixing of the wooden flooring material 54. Therefore, there is no technical significance in strictly considering how far the end portion 56 includes the wooden flooring material 54. In this embodiment, the end portion 56 of the wooden flooring material 54 includes not only the upper surface of the wooden flooring material 54 but also its surrounding area.

[0042] The retaining portion 511 is fixed directly or indirectly to the machine frame 25. In this embodiment, the one-sided retaining member 51B has a main body portion 512 and a rising portion 513 in addition to the retaining portion 511. The main body portion 512 is the part to which the fixing member 57 that fixes the retaining portion 511 to the machine frame 25 is attached. In this embodiment, the fixing member 57 is a bolt 571. The rising section 513 separates the main body section 512 from the retaining section 511. The end 56 of the wooden flooring material 54 does not extend beyond the rising section 513. The end 56 of the wooden flooring material 54 can be positioned in contact with the rising section 513. The numerous wooden flooring materials 54 arranged on the crossbars 254 of the loading platform 2 are neatly lined up in a row by their end 56 contacting the rising section 513.

[0043] (Machine frame to which one side of the front of the loading platform is secured) In Figure 5, the crossbar 254 and the front frame 253B are both part of the machine frame 25. The support portion 58 is a plate material with a bent portion located directly beside the crossbar 254, and one end is bent to form a welded portion 581. The welded portion 581 is welded to the crossbar 254 and becomes part of the machine frame 25 by being integrated with the crossbar 254. The other end of the support portion 58 is in contact with the front frame 253B in this embodiment. The other end of the support portion 58 may also be welded to the front frame 253B. The support portion 58, which is part of the machine frame 25, is provided with a through hole for a bolt 571. Either the nut 572 or the bolt 571 is secured to prevent rotation. Fastening is completed by turning the other, unsecured nut 572 or bolt 571. In this embodiment, the bolt 571 is welded to the support portion 58, and the welding prevents the bolt 571 from rotating. In this embodiment, since the bolt 571 is welded to the support part 58, the worker can easily fasten and secure the main body part 512 and the support part 58 by rotating the nut 572. The retaining portion 511 provided on the main body portion 512 is fixed to the machine frame 25 via the support portion 58 by a nut 572, which is a detachable fixing member 57.

[0044] In this embodiment, a bolt 571 and a nut 572 were used as the fixing member 57, but the fixing method is not limited to that shown in this embodiment. Any type is acceptable as long as the retaining part 511 can be fixed to the machine frame 25.

[0045] Furthermore, the fixing of the machine frame 25 and the retaining part 511 may be direct or indirect. In this embodiment, the retaining part 511 is indirectly fixed to the crossbar 254 (machine frame 25) via a support part 58 welded to the crossbar 254. The retaining part 511 may also be directly fixed to the crossbar 254 or the front frame 253B.

[0046] The end portion 56 of the wooden floorboard 54 is simply absorbed into the space created between the retaining portion 511 and the support portion 58, and is fixed to the machine frame 25; no fasteners or anything similar are directly driven into the wooden floorboard 54. Since no holes are provided in the wooden flooring material 54 for driving in fasteners, the problems such as deterioration around the fasteners on the wooden flooring material 54, as described in the conventional technology, do not occur. For this reason, the cargo bed 2 made of the wooden flooring material 54 in this embodiment has improved durability compared to the conventional technology.

[0047] Furthermore, in this embodiment, even if a part of the wooden flooring 54 is damaged, it can be replaced simply by loosening the nut 572 that secures the one-sided retaining member 51B. Furthermore, when replacing all the wooden floorboards 54, conventional fastening methods required removing all of the numerous fastening members (bolts 571 and nuts 572 or tapping screws) that were driven into each individual wooden floorboard 54. The one-sided retaining member 51B of the embodiment can fix a large number of wooden floorboards 54 together, and does not require the many fastening members (bolts 571 and nuts 572 or tapping screws) of conventional methods to fix the main body 512. As described above, the cargo bed 2 using the one-sided retaining member 51B of the embodiment was able to significantly improve the efficiency of the wooden floor material 54 replacement work.

[0048] (One-sided retaining member on the rear of the cargo bed) Figure 6 is an enlarged and exploded view of frame E shown in Figure 4(B), illustrating the single-sided retaining member 51B on the rear side of the cargo bed 2. The structural shape of the single-sided retaining member 51B on the rear of the cargo bed 2 is substantially the same as that of the single-sided retaining member 51B on the front of the cargo bed 2 described above. Furthermore, the structure of the machine frame 25 to which the single-sided retaining member 51B on the rear of the cargo bed 2 is fixed is also substantially the same as that of the front of the cargo bed 2. The only difference between the two is the orientation of the one-sided retaining member 51B.

[0049] (Securing members on both sides in the center of the cargo bed) Figure 7 is an enlarged and exploded view of the frame D shown in Figure 4(B), illustrating the double-sided retaining members 51A in the center of the cargo bed 2. The double-sided retaining members 51A in the center of the cargo bed 2 are formed by connecting two single-sided retaining members 51B so that their main bodies 512 face each other. The function and structure of the individual members that make up the double-sided retaining members 51A are the same as those of the single-sided retaining members 51B. The machine frame 25 to which the double-sided retaining members 51A are fixed is slightly different from that of the single-sided retaining member 51B. The support portion 58 that fixes the double-sided retaining members 51A has a pair of bent sections on both the front and rear sides. Each pair of bent sections is welded to an adjacent pair of front and rear crossbars 254 (25) to form a welded section 581, constructing a strong machine frame 25. Near the double-sided retaining members 51A is the loading platform pivot axis (not shown). When the loading platform 2 begins to tilt due to the operation of the dump cylinder 12, its load is applied to the double-sided retaining members 51A and the support portion 58 below them. The double-sided retaining members 51A and the support portion 58 also play a role in reinforcing the loading platform 2.

[0050] (Modified example of a machine frame to which a retaining member is fixed) In the embodiment, the double-sided retaining members 51A and the single-sided retaining member 51B were fixed to the machine frame 25 located below them. The double-sided retaining members 51A and the single-sided retaining member 51B are members that only need to be fixed to the machine frame 25. For example, the single-sided retaining member 51B on the rear side of the loading platform 2 may be fixed to the rear frame 253C. Furthermore, since the metal flooring material 55 is fastened to the horizontal bars 254 (25) and integrated with the machine frame 25, it can be said that it constitutes a part of the machine frame 25. For example, the main body portion 512 of the double-sided retaining member 51A can be extended onto the upper surface of the metal flooring material 55, and the double-sided retaining member 51A can be fixed to the machine frame 25 by fastening the main body portion 512 to the upper surface of the metal flooring material 55. Alternatively, the double-sided retaining member 51A and the single-sided retaining member 51B can be fixed to the side frame 253A. As described above, the machine frame 25 to which the double-sided retaining members 51A and the single-sided retaining member 51B are fixed may be fixed directly or indirectly to any member that constitutes the machine frame 25.

[0051] (First modified example of the retaining member) Figure 8 is an explanatory diagram of a first modified example of the double-sided retaining members. The first modified example is an example of a double-sided pressing member 51A that abuts against the edge 561 of the wooden flooring material 54(5). The double-sided pressing member 51A is fixed to the support portion 58 that constitutes the machine frame 25 using a bolt 573 and a nut 572 as the fixing member 57. The pressing portion 511 that presses the end portion 56 of the wooden flooring material 54(5) may also be one that presses the edge 561 of the wooden flooring material 54(5) as the end portion 56. Furthermore, the upper side of the double-sided retaining members 51A in Figure 8 is covered with a cover (not shown) to prevent any step from being created on the floor. This example can also be applied to the single-sided retaining member 51B.

[0052] (Second modified example of the retaining member) Figure 9 is an explanatory diagram of a second modified example of the double-sided retaining members. The second modified example is an example of a roughly T-shaped double-sided retaining member 51A. The double-sided retaining member 51A is not hollow inside and is a molded member made of a robust aluminum alloy. The top surface is countersunk so that it becomes flat when the countersunk screw 574 is fastened. The countersunk screw 574 and nut 572 together form a fixing member 57, which fixes the support part 58(25) and the double-sided retaining member 51A. This example can also be applied to the single-sided retaining member 51B.

[0053] (Contribution to SDGs) The configuration of the tension device 34 protecting the fixing device 33 in the embodiment prevents deterioration of the fixing device 33 and can prevent accidents. This configuration contributes to Sustainable Development Goal 12, "Responsible Consumption and Production." Furthermore, the configuration of the retaining members (double-sided retaining members 51A and single-sided retaining member 51B) that hold down the edges 56 of the flooring material 5 in the embodiment prevents deterioration of the flooring material 5, extends its lifespan, and facilitates replacement. This configuration contributes to Sustainable Development Goal 12, "Responsible Consumption and Production."

[0054] (Combination of aspects) In addition to the embodiments, the applicant has described examples and variations that can be modified at various points. Unless there are any particular contradictions or problems with the purpose and structure, the technologies can be reused and combined. [Explanation of Symbols]

[0055] 1. Agricultural trailer 11 tires 12 Dump Cylinder 13 Bass 15 Vehicles in operation 2. Cargo bed 23. Transported goods (combine harvester) 25 machine slots 252 Main frame material (machine frame) 253 Cargo bed frame (machine frame) 253A side frame 253B Front frame 253C rear frame 254 horizontal bars 3. Stepping board (opening / closing board) 31 Metal fittings 312 Gas spring 32A Rotating fitting on the ramp side 32B Rear frame side rotating fitting 321 Ramp pivot axis 33 Fixation device 331L Left frame fixing plate (frame side mounting part) 331R Right frame fixing plate 3313 3rd hole 3314 4th hole 332 Fixing pins 3321 Threaded part 3322 Grip 3323 Tip 333 Opening / Closing Plate Interlocking Plate 3331 1st hole 3332 2nd hole 34 Tension device 341 Mounting part on the opening / closing plate side 342 Mounting section on the frame side 343 Chain 344 Turnbuckle (Tension Member) 345 Wing nuts 346 Engaging Rod 5. Flooring 51A Double-sided retaining member 51B Single-sided retaining member 511 Retaining part 512 Main body 513 Riser section 54 Wooden flooring 55 Metal flooring 56 End 561 Helix 57 Fixing member 571 volts 572 Nut 573 volts 574 Countersunk screws 58 Support part 581 Welded section

Claims

1. It is equipped with a frame, opening / closing plate, fixing device and tension device, The frame has a pivot shaft, The opening / closing plate can be rotated via a pivot shaft provided on the machine frame to either a closed state, where it is raised, or an open state, where it opens outwards from the machine frame. The fixing device is designed to fix the opening / closing plate in the raised position. The tensioning device comprises a tensioning member, a mounting part on the opening / closing plate side, and a mounting part on the machine frame side. The tension member is characterized by connecting the mounting portion on the opening / closing plate side and the mounting portion on the machine frame side in a manner that allows for flexible tensioning and relaxation. Agricultural trailer.

2. The agricultural trailer according to claim 1, wherein the opening and closing plate is a ramp, a side plate of the loading bed, or a rear plate of the loading bed.

3. The agricultural trailer according to claim 1, wherein the tension member is a turnbuckle.

4. The agricultural trailer according to claim 1, wherein the tension member is a spring can.

Images