JP5087351B2 - Cargo bed with tailgate - Google Patents

Description

  The present invention relates to a cargo bed with a tailgate.

A freight vehicle such as an automobile transport vehicle has a body frame, a tilt frame that tilts backward with respect to the body frame, and a cargo bed that is movable in the front-rear direction with respect to the tilt frame. Then, the loading platform moves backward with respect to the tilted tilt frame, and the loading platform is lowered to the ground. Cars are carried in or out of the loading platform. Thereafter, the loading platform is returned onto the tilted tilt frame, the tilt frame is in a horizontal posture, and the loading platform returns to the state of being mounted on the vehicle body frame.
The loading platform includes a loading platform body on which an automobile is placed, and a tailgate attached to a rear portion of the loading platform body by a hinge. The tailgate can be rotated between a position standing from the rear part of the cargo bed body and a position falling backward. When the vehicle is traveling and when loading and unloading the cargo bed, the tailgate is in an upright position, and when the vehicle is loaded or unloaded on the ground, the tailgate is tilted backward.

Such a loading platform with a tailgate is used to prevent the tailgate from falling when the vehicle suddenly starts up or when the loading platform tilts when loading or unloading the loading platform. In order to maintain the position, a locking device is provided (for example, see Patent Document 1). FIG. 13 shows a conventional locking device. FIG. 13A shows the locked state, and FIG. 13B shows the unlocked state (opened state). A slider 41 is attached to the front part of the arm 40, and the rear part of the arm 40 is attached to a tailgate (not shown).
As described above, according to the locking device shown in FIG. 13 having the slider 41 that slides in the vehicle front-rear direction, the arm 40 and the locking device are prevented from protruding upward in the state where the tailgate is tilted backward. In addition, the locking device is automatically locked when the tailgate is raised. The slider 41 can move only in the vehicle front-rear direction. When the tailgate is in the standing position, the slider 41 exists on the front side, and when the tailgate falls backward, the slider 41 moves rearward. Therefore, the conventional locking device maintains the tailgate in the upright position by restricting the slider 41 from moving backward.

JP 2004-224226 A

As shown in FIG. 13, the conventional locking device has a hook 42 for preventing the tail 41 from moving backward in order to prevent the tail gate from collapsing during a sudden start and the like, and an opening by a manual operation. In addition to the release hook 43 that opens the slider 41 from the prevention hook 42, the opening prevention hook 42 is rotated upward due to vertical force due to vertical vibration during traveling of the vehicle. There is a further need for a stopper 44 that is unlocked and prevents the tailgate from falling over.
Thus, in the conventional loading platform with a tailgate, the number of necessary parts is increased and the configuration is complicated in the lock device for maintaining the tailgate in the upright position.

  An object of the present invention is to provide a cargo bed with a tailgate that can simplify the configuration and maintain the tailgate in an upright position.

In order to achieve the above object, a cargo bed with a tailgate according to the present invention is capable of moving between a cargo bed body on which a load is placed, and a position rising from the rear end of the cargo bed body and a position falling backward. A tailgate attached to the rear end portion of the tailgate, and a part of the tailgate attached to the tailgate and an engaging portion in the other portion, and the engagement when the tailgate in the standing position starts to fall backward It is possible to change the position between an operation mechanism that moves the portion upward, a lock position that restricts the upward movement of the engagement portion, and a non-lock position that allows this movement, and from the lock position to the non-lock position side. Switching between a hook that is provided with the direction in which the position starts to be changed upward, a restriction state that restricts a change in the position of the hook at the lock position, and a release state that releases the restriction. And a stopper, the operating mechanism, the hook and the stopper is provided on each of the right and left sides, provided with an interlocking member for interlocking the switching between the release state and the regulation state in the stopper in the right and left, the operating mechanism Has the engaging portion at the front portion, the rear portion being pivotally attached to the middle portion in the longitudinal direction of the tailgate, and one end portion in the middle of the rear of the cargo bed body. And the other end of the guide member is rotatably attached to the arm. The other end of the guide member has the tailgate in the upright position. In a certain state, it is arranged in front of one end of the guide member .

According to this platform with a tailgate, when the hook is in the locked position and the upward movement of the engaging portion is restricted, the platform is inclined when the vehicle suddenly starts or when the platform is loaded onto or unloaded from the vehicle. When the tailgate is about to fall backward (for example, when suddenly starting), the engaging portion tends to move upward by the operation mechanism. That is, the direction in which the hook is pushed by the engaging portion is upward. Further, this direction is the same upward direction as the direction in which the hook at the locked position starts to change to the non-locked position due to vertical vibration during traveling of the vehicle (hereinafter referred to as traveling vibration). Thereby, it can have two functions because a stopper controls the position change of the hook in a locked position. That is, one stopper has a function of preventing the tailgate from falling when suddenly starting and the like, and a function of preventing the tailgate from falling due to the movement of the hook to the non-lock position side due to running vibration. . As a result, since the number of parts can be reduced, the locking device can be simplified.
The “upward” includes not only upward in the vertical direction but also oblique upward having an upward component.

Also, in one of the left and right sides of the loading platform with Te Rugeto, be switched to the state of the stopper, it is possible by the interlocking member also switches other state.

  According to the loading platform with a tailgate of the present invention, the hook is moved by the movement of the engaging portion when the tailgate is tilted backward, and the hook in the locked position by the traveling vibration is on the unlocked side. Since the direction in which the position starts to change is set to the same upward direction, the stopper can restrict the change in the position of the hook at the lock position, thereby providing two functions. That is, one stopper has a function of preventing the tailgate from falling when suddenly starting and the like, and a function of preventing the tailgate from falling due to the movement of the hook to the non-lock position side due to running vibration. . As a result, since the number of parts can be reduced, the locking device can be simplified.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view of a freight vehicle equipped with a cargo bed with a tailgate according to the present invention. In the following, the “front and rear” relationship is based on the front and rear of the vehicle unless otherwise specified. That is, the driver's seat side is the front side, and vice versa.

This freight vehicle 1 (hereinafter also referred to as a vehicle) is an automobile transport vehicle, and includes a vehicle body 4 having a vehicle body frame 7 and a loading / unloading device 2 mounted on the vehicle body frame 7.
The loading / unloading device 2 includes a loading platform (slide body) 6, a tilt frame 3, and a drive mechanism section 5.
The loading platform 6 includes a loading platform main body 9 on which a load is placed and a tailgate (tread) 8 provided at the rear end of the loading platform main body 9. For example, a passenger car or a civil engineering machine can be mounted on the cargo bed body 9. 6 and 7 are side views showing the rear part of the cargo bed body 9. The tailgate 8 is attached to the rear end 9a of the cargo bed main body 9 via a hinge 8a, and is rotatable with respect to the cargo bed main body 9.

  In FIG. 1, the tilt frame 3 is a frame extending in the vehicle front-rear direction, and is provided on the vehicle body frame 7. As shown in FIGS. 1 and 2, the tilt frame 3 is attached so that the loading platform 6 can move in the front-rear direction. Further, the rear portion of the tilt frame 3 is placed on a roller 17 provided at the rear end portion of the vehicle body frame 7. The roller 17 is provided with the vehicle width direction as an axial direction.

  The drive mechanism unit 5 includes, for example, a cylinder (hydraulic cylinder) 5a and an arm 5b that extend and contract in FIG. 3, and the tilt frame 3 can be tilted. When the cylinder 5a extends, the arm 5b is raised and the tilt frame 3 is tilted backward. Further, since the tilt frame 3 is placed on the roller 17 at the rear portion thereof, the tilt frame 3 is rotated so as to tilt downward with the roller 17 as a fulcrum by the standing of the arm 5b. It moves rearward on the roller 17. That is, as shown in FIGS. 3 to 5, the drive mechanism unit 5 can be moved backward while tilting the tilt frame 3 downward relative to the vehicle body frame 7. Then, when the cylinder 5a shortens from the state of FIG. 5, the arm 5b falls down and can be returned to the horizontal posture while the tilt frame 3 is advanced.

  The drive mechanism unit 5 includes a moving mechanism (not shown) that moves the loading platform 6 in the front-rear direction along the tilt frame 3. A power transmission member such as a chain included in the moving mechanism is connected to the loading platform 6, and the loading mechanism 6 can pull the chain to linearly move the loading platform 6 along the tilt frame 3 in the front-rear direction. With this moving mechanism, the loading platform 6 can be moved along the frame front-rear direction of the tilt frame 3 when the tilt frame 3 is horizontal (FIGS. 1 and 2) or tilted (FIGS. 3 to 5). it can. The frame front-rear direction is a direction from the front part of the tilt frame 3 toward the rear part.

When the vehicle 1 travels, the tilt frame 3 is in a horizontal posture as shown in FIG. 1, and the loading platform 6 is pulled up on the tilt frame 3, and the loading platform 6 is in a front loading completion position. The tailgate 8 is in an upright state.
When the loading platform 6 is lowered to the ground from this state, the loading platform 6 is first moved to a predetermined position on the rear side of the vehicle as shown in FIG. 2, and then moved backward while tilting the tilt frame 3 as shown in FIG. Then, the platform 6 is moved to the vehicle rear side along the tilt frame 3 as shown in FIG. 4, the tilt angle of the tilt frame 3 is increased as shown in FIG. 5, and the platform 6 is landed on the ground. When the loading platform 6 is landed, the tailgate 8 that was in the standing position is brought to a position where the tailgate 8 is tilted backward (see FIG. 7), and a vehicle or the like is carried into or out of the loading platform 6.

  Further, in order to load the loading platform 6 on the body frame 7, an operation opposite to the lowering operation shown in FIGS. 1 to 5 is performed. That is, while returning the loading platform 6 onto the tilted tilt frame 3, the tilt frame 3 moves forward while reducing the tilt angle with respect to the vehicle body frame 7. The tilt frame 3 is in a horizontal posture, and the loading platform 6 is mounted on the vehicle body frame 7.

The tailgate 8 will be further described.
As described above, the tailgate 8 can be moved between the standing position rising from the rear end 9a of the cargo bed body 9 as shown in FIG. 6 and the lying position falling down as shown in FIG. 7 by the hinge 8a. It is attached to the cargo bed body 9.
The loading platform 6 has an actuator (for example, a hydraulic cylinder) 16 that rotates the tailgate 8. The main body (base) of the actuator 16 is attached to the rear part of the cargo bed main body 9, and the front part of the actuator 16 is attached to the tailgate 8. When the actuator 16 extends, the tailgate 8 in a fallen state can be raised, and when the actuator 16 shortens, the tailgate 8 in the standing position can be lowered backward.

A rear portion 10a of the arm 10 is rotatably attached to a middle portion of the tailgate 8 in the longitudinal direction (the front-rear direction in the state of being tilted in FIG. 7). The arm 10 is a rod-like member extending in the front-rear direction.
FIG. 8 is a bottom view of the rear part of the loading platform 6. As shown in this figure, the arms 10 are attached to both sides of the tailgate 8 in the left-right direction. In FIG. 8, the cargo bed body 9 and the tailgate 8 are indicated by two-dot chain lines.

6 and 7, the arm 10 has an engagement pin (engagement portion) 11 at its front portion 10b. The axis of the engagement pin 11 is directed in the left-right direction (vehicle width direction). With the tailgate 8 in the standing position, the arm 10 is inclined downward from the rear part 10a toward the front part 10b.
In addition, a guide member 12 is attached to the middle part of the arm 10 at the front side. One end portion 12a of the guide member 12 is rotatably attached to the cargo bed body 9 by a shaft 18a, and the other end portion 12b is rotatably attached to the arm 10 by a shaft 18b.
In the state where the tailgate 8 is in the standing position, the other end portion 12b of the guide member 12 is in front of the one end portion 12a. With the tailgate 8 in the lying position, the other end portion 12b of the guide member 12 is located behind the one end portion 12a.

  According to the guide member 12, when the tail gate 8 in the standing position starts to fall backward, the arm 10 interlocked with the tail gate 8 is guided, and the engagement pin 11 of the arm 10 is moved upward. That is, when the tailgate 8 starts to fall backward, the arm 10 moves rearward together with this, but the guide member 12 causes the engagement pin 11 to draw a predetermined locus by guiding the arm 10. This locus is a circular locus that is convex upward, as indicated by the alternate long and short dash line in FIGS. 6 and 7, and the engagement pin 11 is present at the front end of the arc locus with the tailgate 8 in the upright position. The engagement pin 11 is present at the rear end of the arc locus in a state where the tailgate 8 is in the lying position. When the tailgate 8 starts to fall backward from the standing position, the engagement pin 11 first tries to move upward (obliquely upward). Then, as the tailgate 8 falls backward, the engaging pin 11 moves backward while moving upward, and further moves backward while moving downward.

As shown in FIG. 7, when the tailgate 8 falls backward to the lying position, the engagement pin 11 moves rearward, and the arm 10 extends from the rear portion 10a to the front portion 10b before and after the tailgate 8 and the cargo bed body 9. The posture is horizontal (substantially horizontal) along the direction.
In addition, the guide member 12 is a curved rod-shaped member, and in a state where the tailgate 8 is in the lying position, the guide member 12 interferes with the engagement pin 11 by the concavely curved portion 12c. It is preventing.
As described above, the arm 10 and the guide member 12 constitute an operation mechanism that moves the engagement pin 11 upward when the tailgate 8 in the standing position starts to fall backward.

  Such a loading platform 6 with a tailgate includes a locking device 20 for maintaining the tailgate 8 in an upright position when the vehicle is traveling. The locking device 20 prevents the tailgate 8 from falling backward by restricting the movement of the engagement pin 11 of the arm 10. Specifically, the lock device 20 includes a hook 13 that can be engaged with the engagement pin 11 and a stopper 14 that can be in contact with the hook 13. The hook 13 is provided on the cargo bed body 9 so that the position can be changed (the posture can be changed). The stopper 14 is provided on the cargo bed body 9 as a position above the front side of the hook 13, and can restrict a change in position (posture change) of the hook 13.

FIG. 9 is a side view of the locking device 20. 10, 11, and 12 are side views for explaining the operation of the locking device 20.
The hook 13 is attached to the cargo bed body 9 so as to be rotatable by a shaft 21. The hook 13 includes a hook main body portion 22 that engages with the engaging pin 11 in the front portion 10 b of the arm 10, and a contact portion 23 that contacts the stopper 14.

The hook body 22 has a protrusion 22a protruding rearward to form a recess 22b. When the hook 13 rotates, the hook body 22 (recess 22b) moves rearward in the horizontal direction. From an open state (FIG. 9) to an obliquely upward rearward state (FIG. 12).
Further, the hook 13 has a receiving portion 22c on the opposite side (lower side) of the protruding portion 22a with the concave portion 22b interposed therebetween. The receiving portion 22c protrudes rearward larger than the protruding portion 22a. That is, the recessed part 22b is formed between the protrusion part 22a and the receiving part 22c.

  As shown in FIG. 9, in a state where the hook main body portion 22 is opened rearward in the horizontal direction, the protruding portion 22a can press the engaging pin 11 that is about to move upward. This state is a state in which the hook 13 is in the locked position, and the hook main body portion 22 can restrict the upward movement of the engagement pin 11 by the stopper 14 preventing the hook 13 from rotating. In addition, the engagement pin 11 is supported by the receiving portion 22c from below, and the engagement pin 11 cannot move downward, so that the tailgate 8 does not fall forward. That is, the engagement pin 11 is sandwiched between the protruding portion 22a and the receiving portion 22c and is held in the concave portion 22b.

  On the other hand, as shown in FIG. 12, in a state where the hook main body portion 22 is opened obliquely upward and rearward, the projecting portion 22a cannot press the engaging pin 11 to move upward from above. That is, the hook 13 is in a state where the engagement pin 11 is released. This state is a state in which the hook 13 is in the unlocked position, and the hook main body portion 22 allows the engagement pin 11 to move upward.

Further, in a state where the hook 14 is in the locked position (FIG. 9), the hook main body portion 22 is located on the rear side from the center of the shaft 21. As a result, in order to change the hook main body portion 22 from being opened rearward in the horizontal direction to being opened obliquely upward and rearward, the hook 14 is first moved forward so as to start moving upward (diagonally upward). It will turn.
As described above, the hook 13 is rotatable between the locked position and the unlocked position, and the direction in which the hook 13 starts to rotate from the locked position to the unlocked side is provided upward.

  One end of an elastic member 24 is attached to the hook 13, and the other end of the elastic member 24 is attached to the cargo bed body 9. The elastic member 24 urges the hook 13 in a direction to make the hook 13 an unlocked position. The elastic member 24 can be a tension coil spring as shown.

  The contact portion 23 of the hook 13 has a first contact portion 23a at the front upper portion and a second contact portion 23b at the rear upper portion. The first contact portion 23a has a curved surface formed in a concave shape, and the second contact portion 23b has a curved surface formed in a convex shape. These curved surfaces are provided continuously. Further, the convex curved surface of the second contact portion 23 b has an arc shape with the axis of the shaft 21 as the center.

  The stopper 14 is attached to the cargo bed body 9 so as to be rotatable by a shaft 26. The stopper 14 has a contacted portion 27 that contacts the hook 13. The abutted portion 27 includes a first abutted portion 27a that abuts on the first abutting portion 23a of the hook 13 in the locked position (FIG. 9), and a hook in the middle of the locking or unlocking operation (FIG. 11). A second abutted portion 27b that abuts on the 13 second abutting portion 23b, and a third abutted portion 27c that abuts on the first abutting portion 23a of the hook 13 in the unlocked position (FIG. 12). Have.

The first abutted portion 27 a has a convex curved surface, and this convex curved surface is an arc-shaped curved surface centering on the axis of the shaft 26. The concave curved surface of the first abutting surface 23a of the hook 13 has (substantially) the same shape as the convex curved surface of the first abutted portion 27a.
The second abutted portion 27b has a linear surface, and the third abutted portion 27c has a linear surface. Both linear surfaces of the second abutted portion 27b and the third abutted portion 27c are arranged to be orthogonal (substantially orthogonal) to form an L-shaped surface.

  An operation member 28 is attached to the stopper 14. The illustrated operation member 28 is a lever member used by an operator. When the user operates the lever member, the stopper 14 rotates about the axis of the shaft 26. As a result, the stopper 14 is switched between a restricted state that restricts the change in the position of the hook 13 at the lock position and a released state that releases the restriction.

  FIG. 9 shows a restricted state, in which the first contact portion 23a of the hook 13 and the first contacted portion 27a of the stopper 14 are in contact. In this state, the hook 13 cannot rotate. 10 to 12 show a released state, in which the first contact portion 23a of the hook 13 and the first contacted portion 27a of the stopper 14 are not in contact. In this state, the hook 13 can rotate.

  In FIG. 8, the arms 10 are provided on the left and right sides of the tailgate 8 as described above. Correspondingly, the guide member 12, the hook 13, and the stopper 14 are also provided on both the left and right sides of the cargo bed body 9. The stoppers 14 on the left and right sides are configured to be interlocked by an interlocking shaft (interlocking member) 15. The interlocking shaft 15 extends between the left and right ends of the cargo bed body 9 in the vehicle width direction. In the illustrated form, the left and right shafts 26 that respectively attach the left and right stoppers 14 to the cargo bed body 9 are composed of both ends of one interlocking shaft 15. The interlocking shaft 15 and the stoppers 14 on both the left and right sides are configured to rotate integrally around the axis of the interlocking shaft 15 (shaft 26).

Accordingly, when one of the left and right stoppers 14 is rotated, the other is also rotated in conjunction with the rotation. The interlocking shaft 15 is provided below a placement floor (not shown) of the cargo bed body 9 on which the automobile is placed.
Further, as shown in FIGS. 8 and 9, an elastic member 29 is attached to the interlocking shaft 15, and urges the stopper 14 in a direction to set the restricted state (the state shown in FIG. 9). . The elastic member 29 can be, for example, a tension coil spring, and one end is attached to the interlocking shaft 15 and the other end is attached to the cargo bed body 9.

The operation of the lock device 20 will be described. First, the operation of releasing the locking device 20 in the locked state that prevents the tailgate 8 from falling backward will be described.
As shown in FIG. 9, when the hook 13 is in the locked position and the first contact portion 23a of the hook 13 is in contact with the first contacted portion 27a of the stopper 14, the hook 13 is in the unlocked position. It cannot be rotated in the direction. That is, the stopper 14 restricts the hook 13 at the lock position from turning to the unlocked position side. In this state, since the convex curved surface of the first contact surface 27a of the stopper 14 and the concave curved surface of the first contact surface 23a of the hook 13 are engaged (engaged), the hook 13 Will not rotate freely even if vibration or the like occurs.

  As shown in FIG. 10, when the stopper 14 is rotated about the axis of the shaft 26 and the first contact portion 23a of the hook 13 and the first contacted portion 27a of the stopper 14 are not in contact with each other, the hook 13 will be in the state which can be rotated to the direction used as a non-locking position. That is, the stopper 14 is in a released state. As described above, the first abutted portion 27a of the stopper 14 is an arc-shaped convex curved surface centered on the axis of the shaft 26, and the concave curved surface of the first abutting surface 23a of the hook 13 is also this. And (substantially) the same shape, the rotation of the stopper 14 around the axis of the shaft 26 facilitates the first contacted portion 27a relative to the first contacted portion 23a (that is, friction). Can slide without being excessively large). At this time, the stopper 14 is rotated against the elastic force of the elastic member 29.

  In the state of FIG. 10, the arm 10 receives the weight of the tailgate 8 in the standing position (the force that the tailgate 8 tries to rotate forward), and the engagement pin 11 of the arm 10 is caused by the load. Is in a state where the receiving portion 22c of the hook 13 is pushed down. Therefore, in this state, the stopper 14 is in the released state, and the urging force of the elastic member 24 is acting on the hook 13, but the hook 13 remains in the locked position.

Then, when the tailgate 8 in the standing position starts to be tilted backward, as shown in FIG. 11, the engaging pin 11 of the arm 10 starts to move upward, and pushes up the protruding portion 22a of the hook 13 in the locked position. As a result, the hook 13 rotates in the unlocking position while the second contact portion 23b of the hook 13 contacts the second contacted portion 27b of the stopper 14. The hook 13 is rotated by the force with which the engaging pin 11 pushes up the protrusion 22 a of the hook 13.
At this time, the second abutted portion 27b is a straight surface, the second abutting portion 23b of the hook 13 is a convex curved surface, both are in line contact, and the second abutting portion 23b is the second abutted portion. It can slide easily with respect to the contact portion 27b (that is, the friction is not excessively increased), and the hook 13 rotates to the unlocked position side.
Further, since the elastic member 29 urges the stopper 14 in the restricting direction, the second contacted portion 27 b of the stopper 14 exerts a contact force on the second contact portion 23 b of the hook 13. Added. And since this 2nd contact part 23b is circular arc shape centering on the axis line of the axis | shaft 21, the direction of the said contact force between the 2nd to-be-contacted part 27b and the 2nd contact part 23b is an axis | shaft. The direction is toward the 21 axis. Thereby, the force (torque) which rotates the hook 13 with the contact force is not generated.

  Then, as shown in FIG. 12, the first abutting portion 23 a of the pivoted hook 13 abuts on the third abutted portion 27 c of the stopper 14, and the second abutting portion 23 b of the hook 13 is the second abutting portion of the stopper 14. The rotation of the hook 13 is regulated by contacting the contacted portion 27b. This state is a state in which the hook 13 is in the unlocked position, and the engagement between the engagement pin 11 of the arm 10 and the hook main body portion 22 of the hook 13 is released. That is, when the lock device 20 is in the unlocked state and the tailgate 8 is tilted backward, the arm 10 is guided by the guide member 12 so that the engagement pin 11 starts to move upward. Then, the tailgate 8 can be rotated to the lying position. Note that the state of the hook 13 from which the engaging pin 11 is separated from the unlocked position is maintained by the elastic force of the elastic member 24.

Next, a description will be given of an operation in which the lock device 20 is locked when the tailgate 8 in the lying position is set to the standing position.
As described above, the arm 10 is guided by the guide member 12, and when the tailgate 8 located at the lying position becomes the standing position, the moving direction of the engagement pin 11 of the arm 10 is downward (diagonally downward). The engaging pin 11 that moves downward contacts the receiving portion 22 of the hook 13 from above (state shown in FIG. 12).

Then, the engagement pin 11 further pushes down the receiving portion 22 by the movement of the tailgate 8 to the upright position, and the hook 13 is automatically rotated to the locked position as shown in FIGS. . At this time, the second contact portion 23 b of the hook 13 slides with respect to the second contacted portion 27 b of the stopper 14. With the tailgate 8 in the upright position, the hook 13 is in the locked position (FIG. 10). In this state, the contact between the second contact portion 23b of the hook 13 and the second contacted portion 27b of the stopper 14 is released (FIG. 10). When this contact is released, as shown in FIG. 9, the stopper 14 is automatically rotated by the elastic force of the elastic member 29, and the stopper 14 regulates the position change of the hook 13 in the locked position. It becomes a regulated state. That is, the first contact portion 27 a of the stopper 14 is in contact with the first contact portion 23 a of the hook 13.
Thus, when the tailgate 8 is in the standing position, the lock device 20 is automatically locked. Thereby, the engaging pin 11 cannot move upward, and the tailgate 8 is maintained in the standing position.

According to the loading platform with a tailgate configured as described above, when the vehicle 1 starts suddenly, the rail gate 8 tends to fall backward. Further, when the loading platform 6 is unloaded, the loading platform 6 assumes a posture inclined rearward (see FIG. 3), so that the tailgate 8 tends to fall backward due to its own weight.
Therefore, according to the embodiment, when the hook 13 is in the locked position and the upward movement of the engagement pin 11 is restricted, when the vehicle 1 is suddenly started or when the loading platform 6 is loaded onto or unloaded from the vehicle 1. When the tailgate 8 is about to fall backward, such as when the loading platform 6 is inclined, the engaging pin 11 tends to move upward by the guide member 12. That is, the direction in which the hook 13 is pushed by the engagement pin 11 is upward. Further, this direction is the same upward direction as the direction in which the hook 13 at the locked position starts to change its position toward the non-locked position due to vertical vibration during vehicle travel.
As a result, the stopper 14 regulates the position change of the hook 13 in the locked position, so that it can have two functions. That is, one stopper 14 has a function of preventing the tailgate 8 from falling over when suddenly starting, and a function of preventing the hook 13 from being moved to the unlocked position side due to running vibration and the tailgate 8 from falling down. Have.

That is, the tailgate 8 tends to fall when the hook 13 at the lock position is lifted up by the vertical force generated by the traveling of the vehicle 1 and the lock position starts to be released, and when the vehicle starts suddenly. Thus, the direction in which the engaging pin 11 tries to rotate the hook 13 toward the unlocked position is the same upward direction. And the position change of the hook 13 which the single stopper 14 tends to rotate in this direction can be controlled.
Further, by rotating the stopper 14, it is possible to switch between a restricted state in which the hook 13 is restricted from changing from the locked position to the unlocked position and a released state in which the restriction is released.
Thus, since one stopper 14 has a plurality of functions, the number of parts can be reduced, and the configuration of the locking device 20 can be simplified.
Even when the vehicle is traveling, the locked state of the locking device 20 is not released.

Furthermore, the stopper 14 is provided on both the left and right sides, and the interlocking shaft 15 can interlock the switching between the restricted state and the released state in the stopper 14 on the left and right. For this reason, if the operation which switches the state of the stopper 14 is performed in one of the left side and the right side of the loading platform 6, the other state can also be switched by the interlocking shaft 15, and the operability is improved.
Further, in a state where the tailgate 8 is tilted rearward (see FIG. 7), the arm 10 becomes substantially horizontal to prevent the arm 10 from projecting greatly above the loading platform, and the locking device 20 (the hook 13 and the stopper). 14) is arranged so as not to protrude greatly above the loading platform, so that it does not get in the way when loading and unloading the vehicle as loading on the loading platform 6.

Further, the cargo bed with a tailgate of the present invention is not limited to the illustrated form, and may be of other forms within the scope of the present invention. For example, in the above-described embodiment, the operation member 28 that operates the stopper 14 has been described as a lever member, but the operation member 28 may be a push-pull wire, although not illustrated. In this case, the stopper 14 can be rotated at a location away from the lock device 20.
Further, when the stopper 14 is operated by a push-pull wire, the interlocking shaft 15 may be omitted, and the push-pull wire may be an interlocking member that interlocks switching between the restricted state and the released state in the stopper 14 on the left and right. In this case, although not shown, the push-pull wire has a bifurcated structure having a single operation part operated by the operator and two action parts each operated by this operation part, and each of the two action parts. However, the left and right stoppers 14 may be rotated.

In the above embodiment, the interlocking shaft 15 and the shaft 26 of the stopper 14 are integrated, but they may be separate members, and although not shown, the stopper 14 is configured to be rotatable with respect to the shaft 26. The interlocking shaft 15 may be configured by directly connecting the left and right stoppers 14.
Further, the rotation (opening / closing operation) of the tailgate 8 is performed by the actuator 16, but the actuator 16 may be omitted and the operator may manually operate the tailgate 8.

1 is a side view of a freight vehicle equipped with a cargo bed with a tailgate of the present invention. It is a side view explaining the loading / unloading operation | movement of the loading platform in a cargo vehicle. It is a side view explaining the loading / unloading operation | movement of the loading platform in a freight vehicle, and is the state which is retreating while a tilt frame inclines back. It is a side view explaining the loading / unloading operation | movement of the loading platform in a cargo vehicle, and is a state which has moved the loading platform backward. It is a side view explaining the loading / unloading operation | movement of the loading platform in a freight vehicle, and is a state in which the loading platform grounded to the ground. It is a side view which shows the rear part of a loading platform, and is a state which the tailgate stood up. It is a side view which shows the rear part of a loading platform, and is the state which the tailgate fell backward. It is a bottom view of the rear part of a loading platform. It is a side view which shows the locking device which the loading platform with a tailgate has. It is a side view explaining operation | movement of a locking device. It is a side view explaining operation | movement of a locking device. It is a side view explaining operation | movement of a locking device. It is a side view of the locking device which the loading platform with the conventional tailgate has.

Explanation of symbols

6 Cargo base 8 Tailgate 9 Cargo body 9a Rear end 10 Arm 10a Rear 10b Front 11 Engagement pin (engagement part)
12 Guide member 13 Hook 14 Stopper 15 Interlocking shaft (Interlocking member)

Claims (1)

A body of the loading platform for loading the luggage,
A tailgate attached to the rear end portion of the cargo bed main body so as to be movable between a position rising from the rear end portion of the cargo bed main body and a position tilted backward;
An operation mechanism that has a part attached to the tailgate and has an engaging part in the other part, and moves the engaging part upward when the tailgate in the standing position starts to fall backward,
It is possible to change the position between the lock position that restricts the upward movement of the engaging portion and the non-lock position that allows this movement, and the direction in which the position starts to change from the lock position to the non-lock position side is set upward. Hooks that are
A stopper that switches between a restricted state that restricts a change in the position of the hook in the locked position and a released state that releases the restriction ;
The operating mechanism, the hook and the stopper are provided on both the left and right sides,
An interlocking member that interlocks switching between the restricted state and the release state in the stopper on the left and right;
The operating mechanism has the engaging portion at the front portion, and an arm attached to the middle portion in the longitudinal direction of the tailgate so as to be rotatable.
One end part is configured to be pivotably attached to a middle part of the back of the cargo bed body, and the other end part is constituted by a guide member that is pivotally attached to the arm.
A loading platform with a tailgate , wherein the other end portion of the guide member is disposed in front of one end portion of the guide member in a state where the tailgate is in an upright position .

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