JP5424101B2 - Vehicle carrier structure - Google Patents

Description

  The present invention relates to a loading platform structure for a vehicle having a loading platform with an open top such as a pickup truck.

  Japanese Unexamined Patent Application Publication No. 2009-35057 describes a lidless carrier structure for a truck. The uncovered load carrier structure of a truck is provided with a direction change plate that divides the inside of the uncovered load carrier in the vehicle front-rear direction on the load carrier floor surface of the uncovered load carrier that is open on the front, left, and right sides of the load carrier floor. The deflecting plate is installed at a substantially center portion in the front-rear direction of the lidless loading platform, and the inclination angle with respect to the loading platform floor is set in a range of 45 ° to 135 °.

  In the uncovered cargo bed structure of the above-mentioned truck, by providing the direction change plate, the rear tensile force and the lift force are reduced as compared with the case without the direction change plate.

JP 2009-35057 A

  In the lidless carrier structure of a cargo vehicle disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 2009-35057, the turning plate is arranged at a single location on the cargo bed floor. For this reason, when applied to vehicles with different running conditions such as vehicle speed and vehicles with different outer shapes such as the shape of the cab, the air flow is different, so the air resistance is increased compared to the case where it is placed elsewhere on the cargo bed floor. There is a risk that.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vehicle bed structure capable of effectively reducing air resistance in accordance with the running state of the vehicle, the vehicle body shape, and the like. .

  In order to achieve the above object, a vehicle bed structure according to the present invention includes a bed having left and right side panels and a tailgate, the upper side being opened, a pair of left and right first grooves, and a pair of left and right second grooves. And a current plate.

  The side panels stand up along the front-rear direction opposite to each other at both sides in the vehicle width direction behind the cab. The tailgate stands along the vehicle width direction at a closing position where the rear ends of the left and right side panels are closed. The pair of left and right first groove portions are provided on the inner side in the vehicle width direction of the left and right side panels, and extend in the vertical direction opposite to each other. The pair of left and right second groove portions are provided behind the first groove portions on the inner side in the vehicle width direction of the left and right side panels, and extend in the vertical direction so as to face each other. The current plate can be selectively inserted into one of the first and second grooves, and stands between the left and right side panels so as to face the tailgate in the closed position.

  In the above configuration, by inserting the current plate into the first or second groove portion, the current plate rises along the vehicle width direction in the middle of the front and rear direction of the loading platform and faces the tail gate at the closed position. For this reason, while the vehicle is traveling, the traveling wind that passes over the cab, flows down to the loading platform, collides with the tailgate at the closed position, and flows backward in the loading platform by colliding with the rectifying plate is rectified. It does not flow forward from the board. Therefore, the air resistance can be reduced as compared with the case where the current plate is not provided.

  In addition, since the first groove portion and the second groove portion having different positions in the front-rear direction are included, the vehicle traveling conditions are different, for example, when traveling on a highway and traveling on a general road. When the state of the traveling wind flowing down from above the cab to the loading platform is different, the rectifying plate can be inserted by selecting one of the first and second groove portions that has a higher air resistance reduction effect. Further, even when the state of the traveling wind flowing down from the upper side of the cab to the upper side of the loading platform due to the difference in the outer shape of the vehicle such as the shape of the cab, the air resistance of the first and second groove portions is reduced. Since the rectifying plate can be inserted by selecting the one having the higher effect, the vehicle carrier structure can be used in common even between vehicles having different vehicle outer shapes.

  In addition, since the loading platform is divided in the front-rear direction by the baffle plate, the movement of the loading can be suppressed when the loading platform is loaded.

  Further, the vehicle bed structure may further include a movement restricting means and an interlocking means. The movement restricting means is movable to a restricting position for restricting movement of the rectifying plate inserted in the first or second groove and an allowable position for allowing movement of the rectifying plate. The interlocking means connects the movement restricting means and the tailgate. The tailgate can be set to an open position and a closed position that open between the rear ends of the left and right side panels. The interlocking means moves the movement restricting means from the allowable position to the restricting position in conjunction with the movement of the tailgate from the open position to the close position.

  In the above configuration, since the movement of the rectifying plate is restricted when the movement restricting means is set at the restricting position, occurrence of flapping of the rectifying plate during traveling can be suppressed.

  Further, since the movement restricting means moves from the allowable position to the restricting position in conjunction with the movement of the tailgate from the open position to the close position, no special operation part for restricting the movement of the current plate is required.

  Further, when the tailgate is set to the open position, the movement restricting means moves to the allowable position, and the groove portion into which the current plate is inserted can be changed. Therefore, for example, an operator who sets the tailgate to the open position for loading and unloading cargo on the loading platform while the vehicle is stopped changes the groove portion into which the current plate is inserted when the tailgate is set to the open position. be able to.

  Also, at the start of travel after setting the tailgate to the open position, the tailgate is normally set to the closed position by the operator regardless of whether there is a load, so the rectifying plate is fixed and The occurrence of fluttering of the current plate can be reliably suppressed.

  Moreover, you may provide a left-right pair 1st groove part behind the front-back direction center part among the left and right side panels.

  In the above configuration, since the place where the current plate is inserted can be selected from the first and second groove portions arranged on the side closer to the tail gate in the front-rear direction of the loading platform, The current plate can be erected at a position that effectively blocks the air that has flowed forward.

  The number of groove portions is not limited to two pairs of groove portions, the first groove portion and the second groove portion, and three or more pairs of groove portions including the first groove portion and the second groove portion may be provided. Good.

  Moreover, each groove part may be directly formed in a left and right side panel, and another member which has a groove part may be attached to a left and right side panel.

  According to the present invention, air resistance can be effectively reduced according to the running state of the vehicle, the shape of the vehicle body, and the like.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  FIG. 1 is a side view showing a vehicle bed structure according to the present embodiment, FIG. 2 is a plan view of the vehicle bed structure of FIG. 1, and FIG. 3 shows a groove portion for inserting a current plate in the vehicle bed structure of FIG. 4 is a side view showing a modified example, FIG. 4 is a schematic view of the vehicle bed structure viewed in the IV-IV direction of FIG. 2, and FIG. 5 is a state in which the movement of the current plate is allowed by the movement restricting portion of FIG. 6 is an enlarged view of a main part showing a state in which the movement of the current plate is restricted by the movement restricting part of FIG. 4, and FIG. 7 is a movement restricting part of the vehicle bed structure of FIG. 8 is a schematic diagram showing a modification of the above, FIG. 8 is an enlarged view of a main part showing a state in which the movement of the rectifying plate is allowed by the movement restricting portion of FIG. 7, and FIG. FIG. 10 is a side view showing a flow of traveling wind flowing through the vehicle bed structure of FIG. 1. There, FIG. 11 is a graph showing the reduction amount of the air resistance coefficient in the experiments given vehicle model having a vehicle cargo bed structure of this embodiment. FIG. 12 is a side view showing the flow of the traveling wind flowing through the conventional cargo bed structure. Hereinafter, front and rear refer to the front and rear in the traveling direction of the vehicle. In the figure, arrow UP indicates the upward direction, arrow OUT indicates the vehicle width direction outside, and arrow FR indicates the vehicle front.

  As shown in FIG. 4, the vehicle bed structure 1 according to the present embodiment includes a bed 2, a current plate 4, an interlocking unit 5, and a movement restricting unit 6, and as shown in FIG. It is provided behind the cab 11.

  As shown in FIG. 1, the loading platform 2 includes a loading platform floor surface 21, a front panel 23, left and right side panels 24, a tailgate 25, and a lock portion (not shown). The upper part is provided at a height lower than that of the cab 11, and the upper part is opened. The loading platform floor surface 21 is disposed behind the cab 11 and includes the wheel house portion 22 of the rear wheel 12, and the surface excluding the wheel house portion 22 has a substantially flat surface. The wheel house portion 22 has a curved shape protruding upward. The front panel 23 has a rectangular plate shape and stands at a height lower than the height of the cab 11 along the vehicle width direction so as to face the rear surface of the cab 11. The left and right side panels 24 face each other at both sides in the vehicle width direction behind the cab 11 and stand up at substantially the same height as the front panel 23 along the front-rear direction. As shown in FIG. 2, the left and right side panels 24 are provided with a plurality of groove portions 3 and storage groove portions 35 on the inner side surfaces in the vehicle width direction, respectively. As shown in FIG. 1, the tailgate 25 has a plate-like portion 26 and a rotation shaft 27. The plate-like portion 26 stands at substantially the same height as the left and right side panels 24 in the vehicle width direction at a closing position (shown in FIG. 1) where the rear ends of the left and right side panels 24 are closed. The rotary shaft 27 protrudes coaxially from both ends in the vehicle width direction near the lower end of the plate-like portion 26 to the outside in the vehicle width direction, and engages with engagement holes (not shown) provided in the left and right side panels 24. The rotary shaft 27 is closed with an open position (indicated by a two-dot chain line in FIG. 4) where the plate-like portion 26 is tilted backward about the rotary shaft 27 to open between the rear ends of the left and right side panels 24. Supports the position freely. The lock part has an engaging part and a locking part. The engaging portion is provided at the upper end portion of the rear end portion of the left and right side panels 24. The locking portions are provided at a pair of left and right upper ends on both ends in the vehicle width direction on the rear surface of the plate-like portion 26 at the closed position. The locking portion engages the engaging portion with the locking portion to fix the plate-like portion 26 in the closed position to the left and right side panels 24 so as to be releasable. The plate-like portion 26 of the tailgate 25 is maintained in the closed position while being fixed by the lock portion. The plate-like portion 26 of the tailgate 25 can be set to the open position in a state where the fixation by the lock portion is released.

  As shown in FIG. 2, the plurality of groove portions 3 constitutes a groove portion including a pair of first groove portions and a pair of second groove portions according to the present invention, and includes a first groove portion 31, a second groove portion 32, and a third groove portion. A groove 33 and a fourth groove 34 are included. A pair of first groove portions 31 are formed on the inner side in the vehicle width direction of the left and right side panels 24 and in front of the center portion in the front-rear direction of the loading platform 2, and extend in the vertical direction opposite to each other. The pair of first groove portions 31 partitions a plate-like space having a width w1 and a height h1 (shown in FIG. 1) and a thickness d1 in the cargo bed 2 along the vehicle width direction. A pair of second groove portions 32 are formed on the inner side in the vehicle width direction of the left and right side panels 24 in front of the center portion in the front-rear direction of the loading platform 2 and rearward of the first groove portion 31, and extend in the up-down direction opposite to each other. A pair of third groove portions 33 are formed on the inner side in the vehicle width direction of the left and right side panels 24 and behind the center portion in the front-rear direction of the loading platform 2, and extend in the up-down direction so as to face each other. A pair of fourth groove portions 34 are formed on the inner side in the vehicle width direction of the left and right side panels 24 behind the center portion in the front-rear direction of the loading platform 1 and behind the third groove portion 33, and extend in the up-down direction so as to face each other. A pair of storage groove portions 35 are formed at the front end portion of the loading platform 2 on the inner side in the vehicle width direction of the left and right side panels 24 and extend in the vertical direction opposite to each other. Further, the second groove portion 32, the third groove portion 33, the fourth groove portion 34, and the storage groove portion 35 partition a plate-like space having substantially the same size as the first groove portion 31 along the vehicle width direction. In the present embodiment, the plurality of groove portions 3 and the storage groove portions 35 are formed directly on the left and right side panels 24, but the plurality of groove portions 3 and the storage groove portions 35 are substantially U-shaped in cross section on the left and right side panels 24, for example. The structure which attached the rail of another member of a shape may be sufficient.

  The rectifying plate 4 has a width that is longer than the interval between the left and right side panels 24 and slightly shorter than the width w1 of the plate-like space defined by the plurality of groove portions 3 and the storage groove portions 35. Has a height (= h1) substantially the same as the standing height of the left and right side panels 24 from the cargo bed floor surface 21, and the thickness is the thickness of the plate-like space defined by the plurality of groove portions 3 and the storage groove portions 35, respectively. This is a rectangular plate-like member having a thickness slightly shorter than the length d1, and can be selectively inserted into any one of the plurality of groove portions 3 and the storage groove portions, and is opposed to the tailgate 25 at the closed position. Between the side panels 24. FIG. 1 shows a state where the rectifying plate 4 is inserted into the third groove portion 33, and FIG. 3 shows a state where the rectifying plate 4 is inserted into the storage groove portion 35.

  As shown in FIG. 4, the interlocking portion 5 constitutes interlocking means according to the present invention, and a pair of metal portions are disposed in grooves formed along the front-rear direction at both ends in the vehicle width direction of the cargo bed floor surface 21. This wire is movable in the front-rear direction. In addition, although the interlocking | linkage part 5 is not restricted to metal wires, a member with little elasticity, such as a metal plate, is preferable. The interlocking portion 5 is fixed to the lower end portion of the tailgate 25 through the inside of the tailgate 25 and is in contact with the shaft 28 fixed to the left and right side panels 24. When the part 26 moves from the open position to the closed position, the lower end position of the plate-like part 26 moves from point A to point B, so that it is pulled rearward and moved rearward. In addition, you may connect the front end of the interlocking | linkage part 5 with the front end of the front panel 23 or the left and right side panels 24 via an elastic member. With this configuration, when the plate-like portion 26 of the tailgate 25 moves from the closed position to the open position, the interlocking portion 5 is biased forward by the elastic member, and the slackness of the interlocking portion 5 is always eliminated by the elastic member. Is done.

  As shown in FIG. 4, the movement restricting portion 6 constitutes a movement restricting means according to the present invention, is fixed to the interlocking portion 5, and is provided in the vicinity of the respective left and right lower end portions of the plurality of groove portions 3 and the storage groove portions 35. As the interlocking unit 5 moves, it can move back and forth. In the present embodiment, the movement restricting portion 6 is set at the front portion of the plurality of groove portions 3 or the storage groove portions 35 (shown in FIG. 5) when the plate-like portion 26 of the tailgate 25 is in the open position (shown in FIG. 5). The plate-like portion 26 of the tailgate 25 is moved from the front to the rear in conjunction with the movement from the open position to the closed position (shown in FIG. 6). As a result of this movement, the movement restricting portion 6 makes the thickness of the plate-like space defined in the plurality of groove portions 3 and the storage groove portions 35 larger than the plate thickness of the rectifying plate 4 at the open position of the plate-like portion 26 of the tailgate 25. It is set to an allowable position (shown in FIG. 5) that opens to a thick length, and at the closed position of the plate-like portion 26 of the tailgate 25, the thickness of the plate-like space partitioned in the plurality of groove portions 3 and the storage groove portions 35 is set. The restricting position (shown in FIG. 6) is set to be narrowed to a thickness thinner than the thickness of the current plate 4. Therefore, when the movement restricting portion 6 is set to the restricting position, the movement of the rectifying plate 4 inserted into any of the plurality of groove portions 3 and the storage groove portion 35 is restricted, and the movement restricting portion 6 is set to the allowable position. When set, movement of the rectifying plate 4 inserted into any of the plurality of groove portions 3 and the storage groove portion 35 is allowed. In addition, in this embodiment, although the interlocking | linkage part 5 and the movement control part 6 are arrange | positioned at right and left, you may arrange | position only at right and left.

  In a wind tunnel test of a scaled vehicle model having the vehicle bed structure of the present embodiment shown in FIG. 11, when the position of the current plate is 0 at the front end of the load bed and 1 at the rear end of the load bed, the current plate is not installed. Compared to the case, the installation position 0.5 (1/2 position from the front end to the rear end of the loading platform) and the installation position 0.75 (from the front end to the rear end of the loading platform) which are behind the center in the longitudinal direction of the loading platform In the case of 3/4 position), the air resistance was effectively reduced.

  Moreover, the modification of the movement control part 6 is shown in FIGS. As shown in FIG. 7, the movement restricting portion 61 has a rotating shaft 62 and a stopper 63. The rotating shaft 62 protrudes inward in the vehicle width direction from the left and right side panels 24 and is supported so as to be rotatable in the vicinity of the respective left and right lower ends of the plurality of groove portions 3 and the storage groove portions 35 with respect to the left and right side panels 24. The The stopper 63 has a lower end fixed to the interlocking portion 5 and an intermediate portion fixed to the rotating shaft 62. In this modification, the stopper 63 is set at the rear of the plurality of grooves 3 or the storage grooves 35 (shown in FIG. 8) when the tailgate 25 is in the open position, and is closed from the open position of the plate-like portion 26 of the tailgate 25. In conjunction with the movement to the position, the lower end moves from the front to the rear (shown in FIG. 9). Further, since the intermediate portion of the stopper 63 is fixed to the left and right side panels 24 via the rotation shaft 62, the upper end portion of the stopper 63 moves from the open position of the plate-like portion 26 of the tailgate 25 to the closed position. In conjunction with, it rotates from the rear to the front. As a result, the stopper 63 is a plate that has an upper end located at the rear of the plurality of grooves 3 or the storage grooves 35 in the open position of the plate-like portion 26 of the tailgate 25 and is partitioned within the plurality of grooves 3 and the storage grooves 35. The thickness of the shaped space is set to an allowable position that opens to a length larger than the thickness of the rectifying plate 4 (shown in FIG. 8). It moves to the front from the rear part of the groove part 3 or the storage groove part 35, and the thickness of the plate-like space defined in the plurality of groove parts 3 and the storage groove part 35 is set to a restriction position where the thickness is narrower than the plate thickness of the current plate 4 (Shown in FIG. 9). Therefore, when the movement restricting portion 61 is set to the restricting position, the movement of the rectifying plate 4 inserted into any of the plurality of groove portions 3 and the storage groove portion 35 is restricted, and the movement restricting portion 61 is set to the allowable position. When set, movement of the rectifying plate 4 inserted into any of the plurality of groove portions 3 and the storage groove portion 35 is allowed.

  As described above, in the present embodiment, the rectifying plate 4 is inserted into any one of the first groove portion 31, the second groove portion 32, the third groove portion 33, and the fourth groove portion 34, so that the rectifying plate 4 becomes the loading platform 2. It stands up along the vehicle width direction at the middle in the front-rear direction and faces the tailgate 25 in the closed position. For this reason, as shown in FIG. 10, while the vehicle 10 is traveling, it passes over the cab 11 and flows down to the loading platform 2, collides with the tailgate 25 at the closed position, and flows backward to move forward in the loading platform 2. The flowing traveling wind collides with the current plate 4 and does not flow forward from the current plate 4. Therefore, the air resistance coefficient can be reduced and the lift coefficient can be reduced as compared with the case where the rectifying plate 4 is not provided (shown in FIG. 12).

  Moreover, since it has the 1st groove part 31, the 2nd groove part 32, the 3rd groove part 33, and the 4th groove part 34 from which a position differs in the direction of order, for example, when driving on a highway and driving on a general road, When the traveling wind flowing down from the upper side of the cab 11 to the upper side of the loading platform 2 is different due to the different traveling conditions of the vehicle 10, the first groove portion 31, the second groove portion 32, the third groove portion 33, and the Of the four groove portions 34, the one having the higher air resistance reduction effect can be selected and the rectifying plate 4 can be inserted. In addition, even when the traveling wind flowing down from the upper side of the cab 11 to the upper side of the loading platform due to the difference in the outer shape of the vehicle 10 such as the shape of the cab 11, the first groove portion 31, the second groove portion 32, the second Since the rectifying plate 4 can be inserted by selecting one of the third groove portion 33 and the fourth groove portion 34 which has a higher effect of reducing air resistance, the vehicle bed 1 can be used even between vehicles having different outer shapes. The structure can be used in common.

  Moreover, since the loading platform 2 is divided | segmented into the front-back direction by inserting the baffle plate 4 in a pair among the 1st groove part 31, the 2nd groove part 32, the 3rd groove part 33, and the 4th groove part 34, the loading platform 2 When there is a load, the movement of the load can be suppressed.

  Further, when a large amount of luggage is loaded on the loading platform 2, it is possible to prevent the interference between the flow regulating plate 4 and the load by inserting the flow regulating plate 4 into the storage groove portion 35 provided at the front end of the loading platform 2.

  Moreover, since the movement of the rectifying plate 4 is restricted when the movement restricting portion 6 is set to the restricting position, occurrence of flapping of the rectifying plate 4 during traveling can be suppressed.

  Further, in conjunction with the movement of the tailgate 25 from the open position to the closed position, the movement restricting portion 6 moves from the allowable position to the restricting position, so a special operation portion for restricting the movement of the rectifying plate 4 is required. And not.

  Further, when the tailgate 25 is set to the open position, the movement restricting portion 6 moves to the allowable position, and the groove portion into which the rectifying plate 4 is inserted among the plurality of groove portions 3 or the storage groove portions 35 can be changed. It becomes. Accordingly, for example, an operator who sets the tailgate 25 to the open position for loading and unloading the load onto the loading platform 2 while the vehicle is stopped, inserts the current plate 4 when the tailgate 25 is set to the open position. Changes can be made.

  Further, at the start of traveling after setting the tailgate 25 to the open position, the tailgate 25 is normally set to the closed position by the operator regardless of whether there is a load, so that the current plate 4 is fixed, The occurrence of flapping of the rectifying plate 4 during traveling can be reliably suppressed.

  In addition, since the movement restricting portion 6 that can move to the restricting position and the allowable position is provided, the size of the rectifying plate 4 is configured to be smaller than the plate-like space defined by the plurality of groove portions 3 and the storage groove portions 35, respectively. Flapping while driving is suppressed. Further, the current plate 4 is configured to be smaller than the plate-like space in which the plurality of groove portions 3 and the storage groove portions 35 are partitioned as described above, so that the current plate 4 can be easily inserted into the plurality of groove portions 3 or the storage groove portions 35. be able to.

  Further, among the plurality of groove portions 3, the pair of third groove portions 33 and the pair of fourth groove portions 34 are provided behind the center portion in the front-rear direction of the loading platform 2. For this reason, since the place which inserts the baffle plate 4 from the 3rd groove part 33 or the 4th groove part 34 arrange | positioned in the front-back direction of the loading platform 2 at the side close | similar to the tail gate 25 can be selected, The rectifying plate 4 can be erected at a position that effectively blocks the air that has collided with the airflow 25 and has flowed forward.

  In the present embodiment, four pairs of the plurality of groove portions 3 are provided. However, five or more pairs of groove portions may be provided, and options for grooves into which the rectifying plates 4 are inserted may be increased.

  As mentioned above, although the embodiment to which the invention made by the present inventor is applied has been described, the present invention is not limited by the discussion and the drawings that form part of the disclosure of the present invention according to this embodiment. That is, it should be added that other embodiments, examples, operation techniques, and the like made by those skilled in the art based on this embodiment are all included in the scope of the present invention.

It is a side view which shows the vehicle bed structure concerning this embodiment. It is a top view of a vehicle carrier structure. It is a side view which shows the example which changed the groove part which inserts a baffle plate in the vehicle bed structure of FIG. FIG. 4 is a schematic diagram of a vehicle bed structure as viewed in the IV-IV direction of FIG. 2. It is a principal part enlarged view which shows the state in which the movement of the baffle plate was permitted by the movement control part of FIG. It is a principal part enlarged view which shows the state by which the movement of the baffle plate was controlled by the movement control part of FIG. It is a schematic diagram which shows the modification of the movement control part of the vehicle bed structure of FIG. It is a principal part enlarged view which shows the state in which the movement of the baffle plate was accept | permitted by the movement control part of FIG. It is a principal part enlarged view which shows the state by which the movement of the baffle plate was controlled by the movement control part of FIG. It is a side view which shows the flow of the driving | running | working wind which flows through the vehicle bed structure of FIG. It is a graph which shows the reduction amount of the air resistance coefficient in the experiment of the predetermined vehicle model provided with the vehicle bed structure of this embodiment. It is a side view which shows the flow of the driving | running | working wind which flows through the conventional loading platform structure.

1: Vehicle loading platform structure 2: Loading platform 3: Multiple grooves (first groove, second groove)
4: Current plate 5: Interlocking part (interlocking means)
6: Movement restriction part (movement restriction means)
24: Left and right side panels 25: Tailgate

Claims (1)

Left and right side panels that stand opposite to each other on both sides in the vehicle width direction behind the cab and stand in the vehicle width direction at a closed position that closes the rear ends of the left and right side panels. A loading platform that has a tailgate and is opened upward;
A pair of left and right first grooves provided on the inner side in the vehicle width direction of the left and right side panels and extending in the vertical direction opposite to each other;
A pair of left and right second groove portions that are provided behind the first groove portion on the inner side in the vehicle width direction of the left and right side panels, and extend in the up-down direction opposite to each other;
A rectifying plate that can be selectively inserted into one of the first and second groove portions and stands between the left and right side panels facing the tailgate in the closed position;
A movement restricting means movable to a restricting position for restricting movement of the rectifying plate inserted in the first or second groove and an allowable position for allowing movement of the rectifying plate;
Interlocking means for connecting the movement restricting means and the tailgate ,
The tailgate has an open position that opens between rear ends of the left and right side panels and the closed position.
It can be set to position and
The interlocking means is interlocked with the movement of the tailgate from the open position to the closed position.
The movement restricting means is moved from the allowable position to the restricting position .

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