JP6497947B2 - Cargo box mounted on the vehicle - Google Patents

Description

  The present invention relates to a luggage box mounted on a vehicle, and more particularly to a lower hinge of a tailgate that can be opened upward and downward.

  With respect to a cargo box mounted on a vehicle, there is known a container that can be tilted (dumped) by a dump device provided on a vehicle body frame, and on which, for example, earth and sand discharged on the vehicle rear side are loaded by the tilting.

  Such a packing box has a front panel, left and right side gates, and a tail gate standing on a floor surface portion. Of these, the tailgate is provided so as to allow both upward and downward movements. The tailgate 91 shown in FIG. 7 rotates around the lower hinge 92 when opening up along the arrow A91, and rotates around the upper hinge 93 when opening down along the arrow A92. .

  The upper hinge 93 is disengaged when the tailgate 91 is opened upward and is engaged when the tailgate 91 is opened downward. When engaging the upper hinge 93, the tailgate 91 opened upward is lifted by hand to operate the lever handle 931a. At this time, in consideration of the complexity of operating the lever handle 931a while supporting the tail gate 91 and the difficulty of the operation becoming hard due to the degree of engagement of the lever handle 931a, a configuration for improving the operability of the lever handle 931a is also known. (For example, Patent Document 1).

  On the other hand, as the lower hinge 91, there are two which are provided on the left and right sides of the tailgate 91, the first lower hinge 921 on the inner side and the second lower hinge 922 on the outer side, respectively. The first lower hinge 921 is engaged when the tailgate 91 opens upward, and the engagement is released when the cargo box 900 tilts rearward of the vehicle and the tailgate 91 opens downward. A configuration that can stably support the tailgate 91 when the top is opened is known (for example, Patent Document 1). Further, the second lower hinge 922 allows the operator to appropriately insert the hinge shaft 922a into the lower bracket 922b fixed to the lower end portion of the tailgate 91. Support for movement is strengthened.

Japanese Patent No. 4118430 JP 2009-184620 A

  In the tailgate 91 capable of both the upward opening and the downward opening, the inventor paid attention to the difficulty of lifting the tailgate 91 after the upward opening to make it stand up.

  Since the packing box 900 conveys and discharges the loaded earth and sand and requires a predetermined strength, the tailgate 91 is mainly made of iron and has considerable rigidity. Furthermore, the tailgate 91 is thick and has a width corresponding to the vehicle width, which increases the weight. For example, in the case of a vehicle having a maximum weight load of 4 tons, it is about 70 kg.

  Such an operation of lifting the tailgate 91 is to reverse the state of hanging from the illustrated height (mainly the waist height of the worker) and rotate it until it stands up on the floor surface. The burden on is very large. Therefore, depending on the worker, the work may be performed by a plurality of people.

  As described above, while the tailgate 91 has a large weight, the fall is surely prevented and the support member is strengthened or simplified, but it is difficult because of its weight and mounting position. Sufficient measures have not been taken to save labor in lifting work.

  The present invention has been made in view of these points, and can be opened upward and downward with respect to a cargo box mounted on a vehicle, and can be easily lifted up and lifted against a floor surface portion. It is an object to provide a configuration having a tailgate that can stand upright.

In the present invention, the following means are used to solve the above problems.
A cargo box mounted on a vehicle having a tailgate that can be tilted by a dump device provided on a vehicle body frame and can be opened and closed with respect to a floor surface portion is an object.

  The tailgate is provided with a lower hinge serving as a rotation support portion at a lower portion when the upper opening is performed. The lower hinge includes a lower bracket that is fixed to the lower portion and has an insertion hole, and a hinge shaft that is inserted through the insertion hole. The hinge shaft has a first locking portion for a tail panel suspended from a rear end edge of the floor surface portion, and a second locking portion for the tailgate. The tail panel is provided with a first locked portion where the first locking portion is locked, and the tailgate is locked with the second locked portion where the second locking portion is locked. Is provided.

The packing box according to the present invention is characterized by having these configurations, and at least a part of the hinge shaft, the first locking portion, or the second locking portion is devised.
Further, the packing box may have the following configuration.

  The first locking portion has a locking piece locked to the first locked portion. The first locked portion includes a rotation restricting portion that is pressed by the locking piece to restrict the rotation of the hinge shaft when the tailgate is opened upward.

  As in the case of the cargo box mounted on the vehicle of the present invention, the lower hinge of the tailgate is inserted into the insertion hole of the lower bracket, and the hinge shaft is locked to the tail panel. And a second locking portion locked to the tailgate, a twisting force is generated in the hinge shaft when the tailgate is opened upward, and the operator lifts the tailgate by hand. In this case, a biasing force is generated. That is, the biasing force has an effect of reducing the burden on the operator who lifts the tailgate.

It is a side view of a dump vehicle which shows the state where the packing box concerning the embodiment of the present invention was carried. (A) is the rear view which looked at the tailgate which concerns on embodiment of this invention from the vehicle rear, (b) is an enlarged view which shows the 2nd lower hinge part of the same tailgate, (c) is the 2nd lower hinge of the same It is a principal part perspective view which shows a hinge shaft. (A) is a schematic cross-sectional view showing a second lower hinge portion according to an embodiment of the present invention, (b) is a schematic cross-sectional view showing an open / closed state of the tailgate at the second lower hinge portion, and (c) is the same as above. It is a schematic cross section which shows the operation | movement which lifts the opened tailgate. (A) is a principal part perspective view which shows the hinge shaft of the 2nd lower hinge concerning 2nd Embodiment of this invention, (b) is an enlarged view which shows the 2nd lower hinge concerning the embodiment, (c) is the 1st It is an enlarged view which shows the 2nd lower hinge part which concerns on 3rd Embodiment. (A) is an enlarged view showing a second lower hinge according to the fourth embodiment of the present invention, (b) is a P-P sectional view of the second guide plate, and (c) is related to the second guide plate. It is QQ sectional drawing. (A) is the enlarged view which shows the 2nd lower hinge which concerns on 5th Embodiment of this invention, (b) is the side view which looked at the 2nd lower hinge from the vehicle outer side. It is a perspective view which shows the tailgate which concerns on the conventional embodiment.

  Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a side view showing a vehicle DT having a maximum loading weight of 4 tons in a state in which the packing box 1 according to the first embodiment is mounted. The vehicle DT is mounted on a vehicle body frame 2 having a longitudinal direction in the front-rear direction (left-right direction in the figure) via a hinge 2a so that the cargo box 1 can tilt (can be dumped) rearward of the vehicle. The tilting of the cargo box 1 is performed by a dump device 3 provided in the vehicle body frame 2 and positioned between the cargo box 1 and the vehicle body frame 2. By extending the dump cylinder of the dump device 3, the cargo box 1 tilts toward the rear of the vehicle as indicated by the alternate long and short dash line around the hinge 2a (arrow A1).

  The packing box 1 includes a floor surface portion 11, a front panel (front wall) 12 erected on the front end of the floor surface portion 11, side gates 13 erected on the left and right sides of the floor surface portion 11, and a rear end of the floor surface portion 11. And a tailgate 14 standing upright. The tail gate 14 is provided with an upper hinge 140 at the upper end and a lower hinge (not shown) at the lower end, and the tail gate 14 is secured and held in an upright state. When the cargo box 1 is tilted, the lower hinge is released from being locked, and the tailgate 14 is supported by the upper hinge 140 as shown by the alternate long and short dash line, and rotates around the support point. The downward opening operation is performed (arrow A2).

  The upper hinge 140 is attached to the upper end of the tailgate 14 horizontally via the upper hinge bracket 1401 and the upper hinge shaft 1402 is provided at the upper rear end of the side gate 13 to secure or fix the upper hinge shaft 1402. It is a known thing comprised from the securing metal fitting 1403 which can be tied up. Although not shown in detail, the securing metal fitting 1403 has a U-shaped fixing groove that opens toward the rear of the vehicle, and a U-shaped fixing groove that is the same shape as the U-shaped fixing groove. On the other hand, the rotary groove portion is rotatably supported with the vehicle width direction as the axial center direction, and an operation handle which is provided with the rotary groove portion at the tip and can be gripped by an operator and rotated up and down. When the operator operates this operation handle to rotate the rotation groove portion, the upper hinge shaft 1402 can be secured or released. The upper hinge shaft 1402 functions as a rotation axis (supporting point) in the downward opening operation described above.

  The lower hinge is provided below the tail gate 14 and will be specifically described with reference to FIG. 2 showing the tail gate 14 when the vehicle DT is viewed from behind. For convenience of explanation, the tailgate 14 and the tail panel 15 suspended from the floor 11 are shown, while the side gate 13 and the front panel 12 are omitted.

  As shown in FIG. 2A, the lower hinge according to the present embodiment is provided with a first lower hinge 141 and a second lower hinge 142 on the left and right sides at the lower end of the tailgate 14. Since these left and right hinges 141 and 142 are similarly provided, the hinges 141 and 142 provided on the right side of the vehicle will be described as representative examples.

  The first lower hinge 141 is provided closer to the vehicle center than the second lower hinge 142. The first lower hinge 141 has a known configuration and includes a first lower hinge shaft 141b that is horizontally fixed to a lower end portion of the tailgate 14 via a pair of left and right first lower brackets 141a, A first guide plate 141c that is provided on the back surface of the rear end of the floor portion 11 (see FIG. 1) and that can engage the first lower hinge shaft 141b, and an engagement recess of the first guide plate 141c. And a hook 141d for pressing the engaged first lower hinge shaft 141b from above. A hinge pin (not shown) whose longitudinal direction is the vehicle width direction (left and right direction in the figure) is provided on the rear side rear surface (lower surface) of the floor portion 11 on the rear surface side (vehicle front side) of the tail panel 15. The bracket 141 and the first guide plate 141c are installed, and the hook 141d is provided so as to be rotatable up and down with respect to the hinge pin.

  The tail panel 15 is suspended from the rear end of the floor surface portion 11 as described above, and has an opening 15a corresponding to the first lower hinge shaft 141b at the illustrated position. The first guide plate 141c and the hook 141d protrude toward the vehicle rear side through the opening 15a.

  The hook 141d constitutes an automatic opening / closing device that opens and closes as the cargo box 1 tilts backward (see FIG. 1). As shown in the side view of FIG. 2B, this automatic opening / closing device has one end of a connecting rod 161 connected to the base end of the hook 141d and the other end of the connecting rod 161 connected to an approximately L-shaped arm member 162. The arm member 162 is provided so as to be able to come into contact with a guide portion 164 that is pivotally supported by the shaft support portion 163 and fixed to the vehicle body frame 2. The connecting rod 161 is provided with a buffer portion 165 having a spring built in a portion near the arm member 162. Further, a spring 167 is stretched between a portion of the connecting rod 161 near the hook 141d and the bracket 166 provided on the rear end rear surface side of the floor surface portion 11. The bracket 166 is provided with the above-described hinge pin serving as a rotation shaft of the hook 141d. The connecting rod 161 is pulled toward the rear of the vehicle via the spring 167. That is, the hook 141d is urged by the spring 167 in a direction away from the first lower hinge shaft 141b. Therefore, when the cargo box 1 is tilted rearward of the vehicle, the arm member 162 swings from the state shown in the drawing to the rear side of the vehicle around the shaft support portion 163, and the hook 141d is separated from the first lower hinge shaft 141b. Then, the securing to the shaft 141b is released. On the other hand, when the cargo box is in a horizontal state as shown in the figure, the arm member 163 swings forward of the vehicle, and the connecting rod 161 is pulled toward the front of the vehicle against the urging force of the spring 167. As a result, the hook 141d is firmly locked from above with respect to the first lower hinge shaft 141b.

  As shown in FIG. 2C, the second lower hinge 142 provided adjacent to the first lower hinge 141 includes second lower brackets 1421a and 1422a fixed to the lower end of the tailgate 14 in a pair of left and right. The second lower hinge shaft 142b inserted into the insertion holes 1421h and 1422h of the second lower brackets 1421a and 1422a and the surface of the tail panel 15 (surface facing the vehicle rear side) are fixed by welding or the like. 2 A pair of left and right second guide plates 1421c and 1422c through which the lower hinge shaft 142b is inserted. When the second lower hinge shaft 142b is inserted into the second lower brackets 1421a and 1422a and the second guide plates 1421c and 1422c, the tailgate 14 is secured to the second lower hinge shaft 142b and the lower opening of the tailgate 14 is opened. The function to prevent operation is demonstrated. In addition, during the upward opening operation of the tailgate 14, a supporting function that prevents the tailgate 14 from falling downward is exhibited. When the second lower hinge shaft 142b is not inserted, the shaft 142b is inserted and held in a cylindrical sheath portion provided at the lower end portion and both end portions of the tailgate 14 and connected to each other by a metal chain. The

  The second lower hinge shaft 142b has a distal end portion (left end portion in the figure) 1421b that can be bent around the shaft portion 1422b, and is inserted into the second lower bracket 1421a on the center side in the vehicle width direction. It has a retaining function by bending as shown. Of the second lower hinge shaft 142b, a portion (hereinafter simply referred to as “shaft main body portion”) 1423b that is in a horizontal posture in the inserted state is provided with a protruding piece 1424b at the upper portion on the front end portion 1421b side, and the rear end A substantially L-shaped projecting arm portion 1425b is provided on the upper portion of the portion (right end portion in the drawing).

  The protruding piece 1424b has a length (length in the X-axis direction) longer than the length of the shaft main body 1423b as shown in the perspective view of the main part of FIG. 2D in which a part of the shaft main body 1423b is cut. It is short and has a rectangular cross section having a width D smaller than the outer diameter of the shaft main body 1423b having a substantially circular cross section.

  The second recess is inserted into the second guide plate 1421c on the center side in the vehicle width direction through which the shaft main body portion 1423b is inserted into the side surface portion on the outer side in the vehicle width direction (right side in the drawing) and the protruding piece 1424b. 1421U is connected to the upper and lower sides. The insertion hole 1423h and the first recess 1421U form a bowl-shaped space on the side surface, and the second lower hinge 142 functions to lock the tailgate 14 by the second lower hinge shaft 142b. In this case, the shaft main body 1423b and the protruding piece 1424b are inserted into the bowl-shaped space.

  Further, as can be seen from FIG. 2D, the protruding arm portion 1425b is provided at a position slightly separated from the protruding piece 1424b in the circumferential direction of the shaft main body portion 1423b. Further, the protruding arm portion 1425b protrudes from the distant position along the cross-sectional radial direction of the shaft main body portion 1423b (a direction different from the protruding direction of the protruding piece 1424b), and the tip portion thereof is the longitudinal length of the shaft main body portion 1423b. In the direction, it is bent to the center in the vehicle width direction (the negative direction side of the X axis). The second lower bracket 1422a on the outer side in the vehicle width direction has a second recess 1422U having a substantially trapezoidal cross section in which the tip end portion of the protruding arm portion 1425b is inserted into the side surface portion on the outer side in the vehicle width direction (right side in the drawing). Is provided. The inside of the recessed portion of the second recessed portion 1422U is approximately the same size or slightly larger than the outer shape of the distal end portion of the protruding arm portion 1425b, and when the distal end portion is inserted, the outer surface is the inner surface of the second recessed portion 1422U. It is set so that it may contact.

  Next, a configuration in which the second lower hinge shaft 142b is inserted into the second guide plate 1421c and a state in which the second lower hinge 142 functions will be described with reference to FIG.

  FIG. 3A shows a state in which the second lower hinge shaft 142b is inserted into the insertion hole 1423h and the recess 1421U. As illustrated, the insertion hole 1423h has a substantially circular shape, and the first recess 1421U has a substantially fan shape.

  The shaft main body portion 1423b is in a state of being in contact with the inner peripheral surface of the insertion hole 1423h except for a portion connected to the first recess 1421U, and is in a state of being locked to the insertion hole 1423h. ing.

  The protruding piece 1424b is in contact with the first inclined surface 14211U inclined toward the vehicle front side of the inner peripheral surface of the first recessed portion 1421U, and occupies a part of the region in the first recessed portion 1424b.

  Further, as described above, the protruding arm portion 1425b is in contact with the second concave portion 1422U provided in the second lower bracket 1422a on the outer side in the vehicle width direction, and the protruding arm portion 1425b is in the inserted state. Thus, the second lower bracket 1422a is in a locked state, specifically, a fitted state.

  When the tailgate 14 with the second lower hinge shaft 142b inserted as described above is opened upward with the second lower hinge shaft 142b as a rotation axis along the arrow A31 as shown in FIG. Since the arm portion 1425b is in a state of being locked (fitted) to the second lower bracket 1422a, the second lower hinge shaft 142b is set as the axial center as the tail gate 14 (second lower bracket 1422a) rotates. Rotate. At this time, the second lower hinge shaft 142b itself also rotates about its central axis.

  The protruding piece 1424b rotates along the arrow A4 in accordance with the rotation operation of the second lower hinge shaft 142b, and comes into contact with the second inclined surface 14212U inclined toward the vehicle rear side in the first recess 1421U. Since the second guide plate 1421c is welded to the tail panel 15, the second guide plate 1421c does not move even if the tail gate 14 is rotated. Therefore, when the protruding piece 1424b abuts on the second inclined surface 14212U, the protruding piece 1424b is locked to the second inclined surface 14212U in a state where the rotation operation in the arrow A4 direction is restricted. That is, the second inclined surface 14212U functions as a rotation restricting portion that restricts the rotation operation (the rotation operation of the protruding piece 1424b) of the portion of the second lower hinge shaft 142b where the protruding piece 1424b is provided.

  Therefore, when the second lower hinge shaft 142b is inserted into the second lower brackets 1421a and 1422a, the protruding piece 1424b is locked to the first recess 1421U as the first locking portion of the second lower hinge shaft 142b. In particular, when the tailgate 14 is opened upward, the turning operation is restricted. Further, the protruding arm portion 1425b as the second locking portion of the second lower hinge shaft 142b is also locked to the second recess 1422U when the second lower hinge shaft 142b is inserted into the second lower brackets 1421a and 1422a. In this state, in particular, it is in a fitted state and is rotated in conjunction with the rotating operation of the tailgate 14. That is, the first recess 1421U of the second guide plate 1421c provided on the tail panel 15 serves as a first locked portion, and the second recess 1422U of the second lower bracket 1422a provided on the lower end of the tailgate 14 It functions as a second locking portion.

  If the upward opening operation of the tailgate 14 is further continued, the rotation operation is continuously performed on the side of the second lower hinge shaft 142b where the protruding arm portion 1425b is provided, while the protruding piece 1424b is provided. On the other hand, the rotation is restricted by the second inclined surface 14212U and the second inclined surface 14212U does not rotate. Therefore, the second lower hinge shaft 142b is twisted, and a biasing force is generated on the shaft 142b to bias the tailgate 14 along the arrow A32.

  When the above-described urging force is generated in the second lower hinge shaft 142b, the load of the work of lifting the tailgate 14 that has been lifted up to the upright state after the upward opening is completed is reduced, and the weight of the tailgate 14 is reduced. Since the weight is about 70 kg, the effect is great in eliminating the difficulty of lifting.

  Further, the urging force is generated from a position where the rotation operation of the protruding piece 1424b is restricted by the second inclined surface 14212U. Therefore, as shown in FIG. 3 (c), the tailgate 14 in the suspended state is lifted along the arrow A321 until it becomes close to the horizontal state (first lifting operation), and the arrow after the state becomes close to the horizontal state. The operation of lifting the protrusion piece 1424b along the position A322 to the position where the restriction of the rotational movement is released (second lifting action), and the arrow A323 until the tailgate 14 is raised from the position where the restriction of the rotational movement is released. The work load in the first lifting operation and the second lifting operation among the lifting operations (third lifting operation) is reduced by the urging force. In the vehicle DT according to the present embodiment, the installation height of the second lower hinge shaft 142b is approximately the same as the waist height of the operator. Therefore, since the first lifting operation is performed in a low posture, the load of the operator's lifting operation is particularly large, but the effect becomes remarkable when the urging force is generated during this operation. Similarly, in the second lifting operation from the waist height position to the high position, the load on the operator is large. Depending on the operator, the tailgate 14 is inverted when switching from the first lifting operation to the second lifting operation, and thus the tailgate 14 may be held again. Therefore, a lifting work load is newly generated from the second lifting operation, and the load reducing effect by the biasing force becomes remarkable. In the range where the third lifting operation is performed, the urging force is not generated, but the second lifting operation and the third lifting operation are continuously performed without relatively changing the state in which the operator supports the tailgate 14 by hand. Therefore, the third operation can be easily performed using the second lifting operation.

  Further, the configuration in which the second lower hinge shaft 142b generates an urging force while the urging force is not generated in the range of the third lifting operation is effective when the tailgate 14 is opened upward.

  When the tailgate 14 is opened upward, the operator first holds the upper end of the standing tailgate 14 by hand and rotates the tailgate 14 downward toward the rear of the vehicle. At the start of the upward opening operation that pulls down the tail gate 14 at the high position, the rotation operation of the protruding piece 1424b is not restricted, so that it is possible to prevent an increase in the load of the upward opening operation of the worker. For the operation after the rotation operation of the protruding piece 1424b is restricted, for example, the operation in which the operator pushes the tail gate 14 downward vertically or the operation for rotating the tail gate 14 below the waist height, the tail gate 14 is lower and the tailgate 14 is inclined, so that the load on the operator is relatively low even against the twisting force generated in the second lower hinge shaft 142b. Since it becomes smaller, the upward opening operation can be easily performed.

  Further, the shearing force generated in the second lower hinge shaft 142b is limited by limiting the range in which the torsional force is generated in the rotational operation of the second lower hinge shaft 142b accompanying the rotational operation of the tailgate 14 from the standing state to the suspended state. It is possible to prevent the length and diameter of the second lower hinge shaft 142b from being increased.

  In the present embodiment, the first recess 1421U is provided so as to be larger than the protruding piece 1424b. However, the size of the first recess 1421U depends on the work load when the operator lifts the tailgate 14 and the second lower hinge shaft 142b. The size can be appropriately changed based on the size and durability. Furthermore, the size of the first recess 1421U may be the same as that of the protruding piece 142b, and the protruding piece 142b may be fitted into the first recess 1421U. Further, the shape of the protruding piece 142b may be appropriately changed from a configuration that easily generates a twisting force.

  With respect to the configuration including the second lower hinge shaft 142b that generates the above urging force, the following effects can also be achieved in the cargo box 1 provided with the tailgate 14 capable of both upward and downward movement.

  The first lower hinge 141 allows the tail gate 14 to perform both of the above-described operations. However, the first lower hinge 141 is connected to the connecting rod 161 (see FIG. 2B), and the tail When the gate 14 is opened upward, the hook 141d of the first lower hinge 141 is also applied with the traction force of the connecting rod 161 or the like to firmly press the first lower hinge shaft 141b, and the tail gate 14 is resisted against the pressing force. It is necessary to carry out lifting work. Therefore, not only the lifting work load based on the weight of the tailgate 14 described above, but also the effect of the urging force by the second lower hinge shaft 142b becomes significant in reducing the load against such pressing force.

  Next, an embodiment different from the above-described embodiment will be described with reference to FIG. In addition, it demonstrates centering on a different part from 1st Embodiment, About the same member, it demonstrates using the same code | symbol.

  In 2nd Embodiment, the 2nd lower hinge shaft 242b shown by the principal part perspective view of Fig.4 (a) is used. The second lower hinge shaft 242b is not configured such that the tip portion 2421b bends as in the first embodiment, but with respect to the shaft main body portion 2422b having a substantially circular cross section, the longitudinal length of the second lower hinge shaft 242b from the end surface 24221b. A projecting piece 2423b having a substantially rectangular cross section is projected along the direction (X direction). The substantially rectangular cross section of the protruding piece 2423b has a length that is substantially the same as the outer diameter of the shaft main body 2422b, and a width that is about 1/4 of the outer diameter.

  As shown in FIG. 4B, the second guide plate 2421c is provided with a first recess 2421U into which the tip 2421b of the second lower hinge shaft 242b is inserted. The first recess 2421U includes a substantially cylindrical cylindrical recess 2411U from an end surface on the outer side in the vehicle width direction, and a rectangular rectangular recess 24212U that is connected to the recess 2411U and has a smaller cross section than the cylindrical recess 2411U. The cylindrical recess 2411U can be fitted with the shaft main body 2422b of the tip 2421b of the second lower hinge shaft 242b, and the rectangular recess 24212U has a shape with which the protruding piece 2423b can be fitted. By setting the fitting state, it is possible to prevent the second lower hinge shaft 242b from coming off.

  Further, in the third embodiment, as shown in FIG. 4C, the second lower hinge shaft 142b is inserted through one second lower bracket 342a and a pair of left and right second guide plates 1421c and 1422c. It has. Also in this embodiment, since the one end side of the second lower hinge shaft is locked to the second guide plate 1421c and the other end side is locked to the second lower bracket 342a, an equivalent effect can be obtained.

The second lower hinge shafts 142b and 242b according to the first to third embodiments have a configuration in which the shaft main body portions 1423b and 2422b have a substantially cylindrical shape with the same diameter. Another embodiment may be adopted as a configuration in which twisting force is more likely to occur.
First, the second lower hinge 442 according to the fourth embodiment will be described with reference to FIG.

  FIG. 5A shows an enlarged view of the second lower hinge 442 partially cut away. Similarly to the first embodiment, the second lower hinge shaft 442b is inserted through the second lower brackets 4421a and 4422a and the second guide plates 4421c and 4422c. Since the second lower hinge 442 is mainly different from that of the first embodiment, this different part will be mainly described.

  The second lower hinge shaft 442b includes a first shaft portion 4421b inserted into the second guide plate 4421c, and a second shaft partially inserted into the second guide plate 4421c and also inserted into the second lower bracket 4421a. A portion 4422b, a third shaft portion 4423b located in a region sandwiched between the left and right second lower brackets 4421a, 4422a, a fourth shaft portion 4424b inserted through the second lower bracket 4422a and the second guide plate 4422c, The second lower bracket 4422a has a projecting arm portion 4425b locked to the second recess 4424U, and a shaft pin portion 4426b penetrating through these 4421b to 4425b. Note that the first shaft portion 4421b is provided in a state where the tip end portion 44211b projects in the horizontal direction (left side in the drawing) from the second guide plate 4421c.

  As can be seen from FIG. 5B, which is a cross-sectional view taken along the line PP, the first shaft portion 4421b is a rectangular tube member, and the second shaft portion 4422b is a cylindrical member. The second shaft portion 4422b has a larger cross-sectional area than the first shaft portion 4421b, and is connected to the first shaft portion 4421b. In the second guide plate 4421c, the insertion holes through which the second lower hinge shaft 442b is inserted include the first insertion hole 4421h through which the first shaft portion 4421b is inserted and a substantially rectangular cross section, and the second shaft portion 4422b. The second insertion hole 4422h having a substantially circular cross section is inserted and connected. As shown in FIG. 5A, the first shaft portion 4421b is in contact with the inner peripheral surface of the first insertion hole 4421h, and the second shaft portion 4422b is in contact with the inner peripheral surface of the second insertion hole 4422h. Further, the second lower hinge bracket 4421a is provided with a third insertion hole 4423h having the same shape as the second insertion hole 4422h, and the second shaft portion 4422b is in contact with the second lower hinge bracket 4421a in the same manner. It is in a state.

  As described above, since the first shaft portion 4421b is inserted into the second guide plate 4421c in a state where the diameter is smaller than that of the second shaft portion 4422b, the front end surface of the second shaft portion 4422b (the left end surface in the drawing). 5a abuts against the connecting portion (expanded diameter portion) of the first insertion hole 4421h and the second insertion hole 4422h and restricts the insertion operation of the second lower hinge shaft 442b to the left side in the figure, as shown in FIG. It can be in the state that was done.

  In addition, an annular groove 44212b along the substantially rectangular outer surface is provided in a portion adjacent to the second guide plate 4421c in the tip portion 44211b. On the other hand, a locking bracket 442d is provided on the side surface of the second guide plate 4421c on the center side in the vehicle width direction so as to be pivotable up and down via a pivot pin 4421d, and the locking bracket 442d is connected to the groove 44212b. By being locked, the movement of the second lower hinge shaft 442b to the left and right is restricted, and the function of preventing the removal is exhibited.

  The third shaft portion 4423b has a cylindrical shape that enters a region sandwiched between the left and right second lower brackets 4421a and 4422a, and is approximately the same size or slightly smaller than the inner peripheral surface of the second insertion hole 4422h. Have an outer diameter of.

  The fourth shaft portion 4424b has a substantially cylindrical shape that is inserted through both the second lower bracket 4422a and the second guide plate 4422c. The fourth insertion hole 4424h of the second lower bracket 4422a and the fifth insertion hole 4425h of the second guide plate 4422c have the same shape as the third insertion hole 4423h, and are inserted into the inner peripheral surfaces of both the insertion holes 4424h and 4425h. The fourth shaft portion 4424b is provided so as to abut.

As shown in FIG. 5A, the portions 4421b to 4424b in the second lower hinge shaft 442b are adjacent to the portions 4422b to 424b excluding the reduced first shaft portion 4421b, and the outer shape is substantially cylindrical. It has become.
The protruding arm portion 4425b has the shape and function of the protruding arm portion 1425b according to the first embodiment.

  In the shaft pin portion 4426b, a protruding tip portion 44261b from the tip portion 44211b is welded to the tip portion 44211b. A protruding rear portion 44262b protruding from the protruding arm portion 4425b is also welded to the protruding arm portion 4425b. Note that the second shaft portion 4422b, the third shaft portion 4423b, and the fourth shaft portion 4424b are not welded.

  When the second lower hinge shaft 442b is inserted as described above and the tailgate 14 is opened upward (arrow A31) as shown in FIG. 5C, which is a cross-sectional view taken along the line QQ in FIG. The protruding arm portion 4425b locked to the second concave portion 4424U also rotates in conjunction with it. At this time, the shaft pin portion 4426b welded to the protruding arm portion 4425b also rotates along the arrow A4 direction.

  On the other hand, on the first shaft portion 4421b side where the shaft pin portion 4426b is welded, the first shaft portion 4421b has a substantially rectangular cross section, and the first insertion hole 4421h has a substantially rectangular cross section. They are in contact with each other, specifically in a fitted state. Therefore, in the portion inserted through the second guide plate 4421c, the rotation operation in which the shaft pin portion 4426b follows the upward opening operation causes the contact state (fitting) between the first shaft portion 4421b and the first insertion hole 4421h. It is regulated by locking based on the state.

  That is, the first shaft portion 4421b is locked to the first insertion hole 4421h serving as the first locked portion as the first locking portion, and the protruding arm portion 4425b is locked to the second locked portion as the second locking portion. The second recessed portion 4424U serving as a stop portion is locked. Therefore, when the tailgate 14 is opened upward, the shaft pin portion 4426b has a state where the rotation operation is restricted on the first shaft portion 4421b side and a state where the rotation operation is allowed on the fourth shaft portion 4424b side. Twisting force is generated.

  The second lower hinge shaft 442b according to the present embodiment has an elongated shaft pin portion 4426b with a reduced diameter, and a shaft is inserted into the insertion portion of the second lower brackets 4421a and 4422a and the second guide plates 4421c and 4422c. A first shaft portion 4212b, a second shaft portion 4422b, and a fourth shaft portion 4424b are provided around the pin portion 4426b. Therefore, the second lower hinge 442 has a supporting force for supporting the tailgate 14 and a torsional force is separately generated by the shaft pin portion 4426b, which can greatly contribute to the reduction of the load on the operator who lifts the tailgate 14. That is, even if the outer diameter of the second lower hinge shaft 442b itself is large, the shaft pin portion 4426b that generates the twisting force is reduced in diameter, so that the supporting force of the tailgate 14 and the attachment for lifting the tailgate 14 are added. A great effect can be achieved with respect to power.

  Further, in the present embodiment, a third shaft portion 4423b is separately provided as a member provided around the shaft pin portion 4426b. Therefore, the weight of the second lower hinge shaft 442b can be reduced by configuring the third shaft portion 4426b to be a member that is lighter than the first shaft portion 4421b (for example, wood, aluminum). Further, the third shaft portion 4423b may be configured to be short or omitted as a configuration in which the second shaft portion 4422b and the fourth shaft portion 4424b are positioned with respect to the shaft pin portion 4426b.

  Next, in the second lower hinge, a fifth embodiment in which the second locking portion locked on the tailgate 14 side is different from the fourth embodiment will be described with reference to FIG. In the present embodiment, a description will be given centering on differences from the fourth embodiment.

  As shown in FIG. 6A, the second lower hinge 542 according to this embodiment includes a lever portion 54251b that is welded to the projecting rear portion 54262b of the shaft pin portion 5426b and provided in a suspended state, and a second outer hinge 542b on the outer side in the vehicle width direction. 2 and a protruding pin portion 54252b that protrudes in the horizontal direction provided on the outer surface of the lower bracket 5422a.

  As shown in FIG. 6B, the protruding pin portion 54252b has a protruding length that is locked to the lever portion 54241b when the tailgate 14 is opened upward. As indicated by the one-dot chain line portion from the solid line portion, if the upward opening operation of the tailgate 14 is continued in the state of being locked to the lever portion 54241b, a twisting force is generated in the shaft pin portion 5426b as in the fourth embodiment. Therefore, it is possible to reduce the load on the operator when lifting the tailgate 14 by the amount that the twisting force is generated. In the present embodiment, the lever portion 54252b is provided so as not to protrude toward the vehicle rear side from the tailgate 14 in the standing state. However, when the lever portion 54252b is allowed to protrude toward the vehicle rear side, the lever portion 54252b may be provided in a horizontal state or in an inclined state, and the shaft pin portion 5426b may be configured to generate a large twisting force.

  In addition to the second lower hinge according to the first to fifth embodiments, although not shown in the drawings, a spring member that is tightly wound as a horizontal direction and a winding shaft serves as a second lower hinge shaft. It is good also as a structure inserted in the insertion hole of a lower bracket and a 2nd guide plate. At this time, in order to increase the supporting force of the tailgate 14, it is preferable that a long shaft core portion is provided as a guide member. Furthermore, it is set as the structure by which the said spring member (or the spring member provided with the axial core part used as a guide member) was provided instead of the shaft pin part 4426b, 5426b which concerns on 4th Embodiment or 5th Embodiment. You can also

  As described above, the second lower hinge 142 according to each embodiment can generate an urging force when the tailgate 14 is lifted. The number of the second lower hinges 142 is as shown in FIG. As shown in FIG. 4, the number of tail gates 14 is not limited to one on each of the left and right sides, but may be one or three or more. Also, the installation location may be the central portion instead of the left and right end portions. Moreover, the 2nd lower hinge which concerns on each embodiment is applicable also to a thing with the largest loading weight of another magnitude | size.

  The present invention is useful for all packing boxes provided with a sliding door that can be opened upward and downward.

DT Vehicle 1 Cargo box 2 Car body frame 3 Dump device 11 Floor surface portion 12 Front panel 13 Side gate 14 Tail gate 15 Tail panel 141 First lower hinge 142 Second lower hinge 1421a, 1421b Second lower bracket 142b Second lower hinge shaft 1423b Shaft body (second lower hinge shaft)
1424b Projection piece (first locking part)
1425b Projection pin part (second locking part)
1421c, 1422c Second guide plate 1423h Insertion hole (second guide plate)
1421U 1st recessed part (1st to-be-latched part)
1422U 2nd recessed part (2nd to-be-latched part)
14211U 1st inclined surface 14212U 2nd inclined surface (rotation control part)

Claims (2)

A cargo box mounted on a vehicle having a tailgate that can be tilted by a dump device provided on a vehicle body frame and that can be opened and closed with respect to a floor surface portion,
Wherein the tailgate, lower hinge is provided with the supporting state is released when the bottom opening together are pivotal support portion definitive downward portion during opening on said,
The lower hinge has a lower bracket, and a pluggable hinge shaft for the insertion hole having a fixed in the insertion hole in the lower part,
The hinge shaft has a first locking portion for a tail panel suspended from a rear end edge of the floor surface portion, and a second locking portion for the tail gate,
The tail panel is provided with a first locked portion to which the first locking portion is locked,
A cargo box mounted on a vehicle, wherein the tailgate is provided with a second locked portion to which the second locking portion is locked. Unlike the lower hinge, the tailgate is provided with a separate lower hinge that is used as a rotation support portion in a lower portion when the upper opening is performed and a support state is released when the lower opening is performed. And
The another lower hinge is a guide having a lower hinge shaft provided at a lower end portion of the tailgate via a lower bracket, and an engagement recess provided on the cargo box side and engageable with the lower hinge shaft. 2. The cargo box mounted on a vehicle according to claim 1, further comprising a plate and a hook having a hook portion capable of locking the lower hinge shaft from above .

Images