JP2010274781A - Cargo handling vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rear bumper structure preventing a front part of a container from being contact with a rear bumper during an unloading work of the container without limiting an applicable vehicle type in a cargo handling vehicle. <P>SOLUTION: This rear bumper 9 provided in a rear part of a vehicle body frame 1 is constituted of a fixed bumper 10 fixed to the vehicle body frame 1 in a projecting state to the rear side of the vehicle body frame 1 and a pair of right and left movable bumpers 11 mounted to be rotatable forward and backward on both sides of a vehicle width direction of the fixed bumper 10. The pair of movable bumpers 11 are made rotatable forward and backward by a single bumper cylinder 41. The movable bumpers 11 are moved to storage positions by the bumper cylinder 41 during the unloading work of the container C to avoid contact of a front wall Cd and a leg part Cb of the container C with the movable bumpers 11. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a cargo handling vehicle capable of loading and unloading containers.

In a conventional cargo handling vehicle, a cargo handling arm is provided on a body frame so that the cargo handling arm can be rotated back and forth. (For example, refer to Patent Document 1). 23 and FIG. 24, the cargo handling vehicle is a state in which the cargo handling vehicle 100 is stopped in tandem in front of the container 200 and the hook 102 of the cargo handling arm 101 is engaged with the engaging portion 201 of the container 200. The container 200 can be loaded onto the vehicle body frame 103 by rotating the cargo handling arm 101 forward. Moreover, if the cargo handling arm 101 is rotated backward from this loaded state, the container 200 can be lowered to the ground behind the cargo handling vehicle 100.
In addition, the cargo handling arm 101 is rotated in a rearward rotation position until the hook 102 is positioned further rearward than the rear bumper 104 protruding rearward of the body frame 103 (see, for example, Patent Document 2). ). This prevents the front wall 202 and the legs 203 and 204 of the front part of the container 200 from coming into contact with the rear bumper 104 and damaging the rear bumper 104 during the loading and unloading operation of the container 200.

JP 2006-56397 A JP 2006-96066 A

By the way, depending on the loading / unloading location of the container 200, there may be a case where it is not possible to secure a space for stopping the cargo handling vehicle 100 in a column in front of the container 200. In this case, as shown by a two-dot chain line in FIG. 24, it is generally performed that the cargo handling vehicle 100 stops at an obliquely forward position of the container 200 and the container 200 is loaded and unloaded.
However, when the cargo handling vehicle 100 is stopped at an obliquely forward position of the container 200, one side portion or the leg portion 203 of the front wall 202 of the front portion of the container 200 is positioned at the outer end portion (the lower side in FIG. 24) of the rear bumper 104. ). For this reason, when loading and unloading the container 200, the front wall 202 and the leg 203 of the container 200 are brought closer to the rear bumper 104 to contact the outer end of the rear bumper 104, and the rear bumper 104 is damaged. was there.

In order to solve this problem, as described in Patent Document 2, it is conceivable that the rear bumper can be moved back and forth with respect to the vehicle body frame by an extension cylinder. In this case, when the container is loaded and unloaded, if the rear bumper is moved forward by driving the telescopic cylinder, the container being unloaded can be prevented from coming into contact with the rear bumper.
However, in the cargo handling vehicle of Patent Document 2, in order to move the entire rear bumper back and forth, it is necessary to secure a space that allows the rear bumper to move back and forth over the entire length in the vehicle width direction, below the rear part of the vehicle body frame. . For this reason, there is a case where it is difficult to secure the space depending on the vehicle type, and there is a problem that the vehicle type to which such a rear bumper can be applied is limited.
Accordingly, the present invention has been made in view of the above problems, and in a cargo handling vehicle, a rear bumper structure that prevents the front part of the container from coming into contact during loading and unloading operations of the container and the applicable vehicle type is not limited. The purpose is to provide.

  In order to achieve the above object, a cargo handling vehicle according to the present invention includes a vehicle body frame on which a container having an engagement portion at a front portion can be mounted, and a base end portion attached to the vehicle body frame side so as to be able to turn back and forth. A cargo handling arm having a hook that can be engaged with and disengaged from the engagement portion at a distal end, and the container is placed on the vehicle body frame by rotating the cargo handling arm with the hook engaged with the engagement portion. A loading / unloading drive means for loading / unloading between the vehicle body frame and the ground behind the vehicle body frame, and a rear bumper disposed at a rear portion of the vehicle body frame, wherein the rear bumper includes the vehicle body frame A fixed bumper that is fixed to the vehicle body frame in a state of projecting rearward of the vehicle, an overhang position that is disposed on the outer side of the fixed bumper in the vehicle width direction, and the load that is being unloaded. A movable bumper that is movable between the front portion of the tenor and a retracted position that is non-contacting, and includes a bumper driving means that moves the movable bumper from the extended position to the retracted position. is there.

According to this configuration, the rear bumper is configured by the fixed bumper and the movable bumper, and the movable bumper is not connected to the front portion of the container from the overhang position that is disposed on the outer side in the vehicle width direction of the fixed bumper by the bumper driving means. The movable bumper can be moved to the storage position when the container is loaded and unloaded with the cargo handling vehicle positioned obliquely in front of the container because the container can be moved to the storage position where it comes into contact. Thereby, it is possible to prevent the rear bumper from being damaged by the front part of the container coming into contact with the outer end part of the rear bumper during the container loading / unloading operation.
Furthermore, since only the movable bumper, which is a part of the rear bumper, is moved to the storage position, only the storage space for the movable bumper needs to be secured at the rear of the vehicle, and there is no need to secure the storage space for the entire rear bumper. Therefore, compared to the conventional case where the entire rear bumper is stored, the types of vehicles to which the rear bumper structure can be applied are not limited.

The cargo handling vehicle preferably further includes a lock device that locks the movable bumper to the fixed bumper or the vehicle body frame at the extended position.
According to this, since the movable bumper can be locked to the fixed bumper or the vehicle body frame at the extended position by the locking device, when the following vehicle collides with the movable bumper while the vehicle is traveling, the collision load is locked. It can be received on the vehicle body frame side through. Therefore, the bumper driving means can be prevented from being damaged by the collision load.

Moreover, it is preferable that the said cargo handling vehicle is further provided with the interlock mechanism which cancels | releases the said locking device with the drive of the said bumper drive means.
According to this, since the bumper driving means can also be used as a driving means for unlocking the locking device via the interlocking mechanism, the manufacturing cost of the cargo handling vehicle can be reduced compared with the case where the driving means dedicated to unlocking is provided. Can be further reduced.

A pair of the movable bumper and the locking device are disposed on both sides of the fixed bumper in the vehicle width direction, and the single bumper driving means is connected to the pair of interlocking mechanisms, and the pair of the bumper driving means It is preferable that the lock device is unlocked and the pair of movable bumpers are moved from the extended position to the retracted position.
According to this, since the pair of lock devices can be unlocked and the pair of movable bumpers can be moved to the storage position by the single bumper driving means via the pair of interlocking mechanisms, each lock device and each movable bumper can be moved. The manufacturing cost of the cargo handling vehicle can be reduced as compared with the case where the driving means is provided for each.

In addition, the cargo handling vehicle is movable between an appropriate position arranged on the outer side in the vehicle width direction of the rear part of the body frame and a retracted position that is not in contact with the front part of the container during loading and unloading work. It is preferable to further comprise a lamp device.
In this case, it is possible to prevent the front portion of the container from coming into contact with the ramp device by moving the ramp device disposed at an appropriate position at the rear of the vehicle body frame to the retracted position during the loading / unloading operation of the container. . Thereby, it is possible to prevent the lamp device from being damaged when the container is loaded and unloaded on the cargo handling vehicle positioned obliquely in front of the container.

Further, the cargo handling vehicle interlocks the movement of the movable bumper and the movement of the ramp device so that the movable bumper sets the ramp device to an appropriate position in the extended position, and the movable bumper moves the ramp device in the retracted position. It is preferable to further include a coupling mechanism for setting the retracted position.
In this case, since the lamp device can be moved in conjunction with the movement of the movable bumper by the coupling mechanism, the moving operation of the movable bumper and the lamp device can be performed quickly.

According to the cargo handling vehicle of the present invention, the movable bumper can be moved to the storage position when the container is loaded and unloaded by the cargo handling vehicle positioned obliquely in front of the container. It is possible to prevent the rear bumper from being damaged due to contact with the outer end portion.
Further, since only the storage space for the movable bumper needs to be secured at the rear of the vehicle, and it is not necessary to secure the storage space for the entire rear bumper, the rear bumper structure described above is applied compared to the case where the entire rear bumper is stored. It is difficult to limit the models that can be used.

FIG. 5 is a side view showing an embodiment of the cargo handling vehicle of the present invention and showing a state when the container loading operation is completed (during traveling). It is a side view which shows the state in the middle of loading a container from the column stop position with the cargo handling vehicle of FIG. FIG. 2 is a side view showing a state where a traveling roller at the rear part of the container is in contact with the ground while the container is being loaded from the column stop position by the cargo handling vehicle of FIG. 1. It is a side view which shows the state which is in the middle of loading a container from the column stop position with the cargo handling vehicle of FIG. 1, and the leg part of the said container front part has floated from the ground. It is a side view which shows the state which dumped the container with the cargo handling vehicle of FIG. It is a figure which shows 1st embodiment of the cargo handling vehicle of FIG. 1, and is a top view which shows the rear part of a vehicle body frame. It is a front view which shows the rear part left side of a vehicle body frame. It is a side view which shows the rear part left side of a vehicle body frame. It is a top view which shows the left movable bumper in an overhang position. It is a top view which shows the left movable bumper in a storing position. It is a principal part expanded sectional view of FIG. 8 which shows a locking device. It is a front view which shows the rear part of a vehicle body frame. It is a principal part enlarged view of FIG. 12 which shows the interlocking mechanism by the side of the piston rod of a bumper cylinder. FIG. 3 is a plan view of FIG. 2. It is a side view which shows the state in the middle of loading a container from the diagonally forward position with the cargo handling vehicle of FIG. It is a side view which shows the state of the interlocking mechanism at the time of bumper cylinder contraction of FIG. It is a side view which shows the state of the interlocking mechanism at the time of bumper cylinder expansion | extension of FIG. It is a whole top view which shows the state in the middle of storing of a movable bumper. It is a whole top view which shows the movable bumper in a storing position. It is a principal part enlarged view which shows the connection bracket by the side of the piston rod of the bumper cylinder which concerns on 2nd embodiment of this invention. It is a side view which shows the state of the interlocking mechanism at the time of bumper cylinder contraction of FIG. It is a side view which shows the state of the interlocking mechanism at the time of bumper cylinder expansion | extension of FIG. It is a side view which shows the state in the middle of loading a container with the conventional cargo handling vehicle. It is a top view of FIG.

[Overall configuration of cargo handling vehicle]
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing an embodiment of a cargo handling vehicle according to the present invention. 2-5 is a side view for demonstrating the function of this cargo handling vehicle. The cargo handling vehicle V loads and unloads the body frame 1 and the container C between the body frame 1 and the ground (see FIGS. 2 to 4), or tilts the container C downward on the body frame 1. And a cargo handling device 2 in a dumped state (see FIG. 5).

The vehicle body frame 1 includes a pair of left and right chassis frames 1a, a cargo handling frame 1b fixed to the upper surface of each chassis frame 1a, and a hanging frame fixed to the rear end portion of each chassis frame 1a orthogonal to the chassis frame 1a. 1c. A guide roller 3 for guiding the main beam Ca at the bottom of the container C is rotatably supported at the rear end of each cargo handling frame 1b. By these guide rollers 3, the container C mounted on the vehicle body frame 1 so as to be able to be loaded and unloaded is smoothly guided and guided. A pair of left and right legs Cb is fixed to the bottom end of the container C, and a pair of left and right traveling rollers Cc are rotatably attached to the rear end. Further, a lift bar Ce as an engaging portion is fixed to a substantially central portion in the width direction above the front wall Cd of the container C. The leg portion Cb and the front wall Cd constitute a front portion Cf of the container C.
The vehicle body frame 1 can also be configured by the chassis frame 1a and the hanging frame 1c without using the cargo handling frame 1b.

  The cargo handling device 2 includes a pair of dump arms 4 whose base ends are attached to the rear of the body frame 1 so as to be pivotable back and forth around the same axis as the rotation axis of the guide roller 3, and a dump arm on the body frame 1 side. 4, the cargo handling arm 5 whose base end is pivotably attached to the front end of the vehicle 4, and one end of the cargo handling arm 5 is pivotally attached to the middle of the cargo handling arm 5. And a lift cylinder 6 composed of a backward hydraulic cylinder attached rotatably.

The cargo handling arm 5 includes a lift arm 5a having a base end portion attached to the tip end portion of the dump arm 4 so as to be pivotable forward and backward, and a base end portion attached to the tip end portion of the lift arm 5a. It has a hook arm 5b and a hook 5c fixed to the tip of the hook arm 5b. A proximal end portion of a hook cylinder 7 formed of a backward hydraulic cylinder is rotatably attached to a distal end portion of the lift arm 5a, and a distal end portion of the hook cylinder 7 is rotatably attached to an intermediate portion of the hook arm 5b. ing. The hook 5c can be engaged with and disengaged from the lift bar Ce of the container C.
Further, the lift cylinder 6 and the hook cylinder 7 constitute a cargo handling drive means S.
In addition, although the base end part (lift arm 5a) of the cargo handling arm 5 is rotatably attached to the dump arm 4, in the case of a cargo handling vehicle not provided with the dump arm 4, the base end part of the cargo handling arm 5 is used. It is also possible to pivotally attach to the body frame 1.

  With the above-described configuration, the hook arm 5b is rotated backward by the hook cylinder 7 to move to the rear of the vehicle body frame 1, and a lashing device (not shown) provided between the dump arm 4 and the lift arm 5a. ), When the lift cylinder 6 is extended in a state where the dump arm 4 and the lift arm 5a can be rotated, the container C with the lift bar Ce engaged with the hook 5c of the cargo handling arm 5 is brought to the ground. Can be taken down (see FIG. 2). In addition, when the lift cylinder 6 is extended in a locked state in which the rotation of the arms 4 and 5a is restricted by the above-described locking device, the container C in which the hook 5c of the cargo handling arm 5 is engaged with the lift bar Ce The dumping state is inclined downward (see FIG. 5).

  A jack 8 that supports the rear portion of the body frame 1 during loading and unloading of the container C is provided at the rear portion of the body frame 1. The jack 8 is rotatably attached to a position near the lower end of the hanging frame 1c, protrudes downward from the hanging frame 1c, and a protruding position where the grounding roller 8a approaches the ground (see FIG. 2) and the front of the vehicle. The grounding roller 8a can be rotated between the storage position (see FIG. 1) where the grounding roller 8a is retracted from the ground upward by approximately 90 °.

[Cargo handling vehicle according to the first embodiment]
FIG. 6 is a diagram showing the main part of the first embodiment of the present invention, and is a plan view showing the rear part of the vehicle body frame 1. FIG. 7 is a front view showing the rear left side of the vehicle body frame 1, and FIG. 8 is a side view showing the rear left side of the vehicle body frame 1.
In FIG. 6, a rear bumper 9 extending in the vehicle width direction is disposed at the rear of the vehicle body frame 1. The rear bumper 9 protrudes rearward of the body frame 1 and is fixed to the vehicle body frame 1 around the vertical axis on both sides of the fixed bumper 10 in the vehicle width direction. It has a pair of left and right movable bumpers 11 attached so as to be pivotable back and forth.

  The fixed bumper 10 has a main body portion 10a and a pair of left and right support portions 10b that support the main body portion 10a. As shown in FIG. 8, the main body 10a is formed in a cross-sectional box shape. Each support portion 10b has a pair of upper and lower horizontal plates 10b1 having one end portion fixed to the lower rear surface of the hanging frame 1c, and a vertical plate 10b2 fixed orthogonally to the other end portions of the both horizontal plates 10b1. ing. The upper and lower horizontal plates 10b1 are connected to each other in the vehicle width direction by a connecting plate 10b3 (see FIG. 9). Both ends of the body portion 10a in the vehicle width direction are fixed to the vertical plate 10b2 of each support portion 10b by bolts 10c and nuts 10d via attachment plates 10a1.

  As shown in FIG. 6, the movable bumper 11 has a main body 11a and an arm 11b that rotatably supports the main body 11a. As shown in FIG. 8, the main body portion 11 a is formed in a cross-sectional box shape having the same shape as the main body portion 10 a of the fixed bumper 10. The arm portion 11b has a pair of upper and lower horizontal plates 11b1 and a vertical plate 11b2 fixed orthogonally to one end of both horizontal plates 11b1. The front surface of the end of the main body 11a is fixed to the vertical plate 11b2. An intermediate portion in the longitudinal direction of the horizontal plate 11b1 is rotatably attached by a pin 12 to a boss portion 10e that penetrates and is fixed to the upper and lower horizontal plates 10b of the fixed bumper 10 (see FIG. 9). ). The pair of horizontal plates 11b are disposed on both ends of the boss portion 10e in the axial direction (vertical direction) relative to the pair of horizontal plates 10b of the fixed bumper 10, and can be rotated without interfering with the horizontal plate 10b. .

  With the above configuration, the movable bumper 11 is pivoted back and forth around the pin 12 so that the movable body 11 has a body portion 11a on the outer side of both sides of the body portion 10a of the fixed bumper 10 in the vehicle width direction. A projecting position (see FIG. 9) disposed on an extension line in the longitudinal direction (vehicle width direction) 10a and a storage position (see FIG. 9) inclined about 30 degrees toward the front side of the body frame 1 with respect to the projecting position. 10)). The overhang position is a position where the arrangement position of the movable bumper 11 with respect to the cargo handling vehicle V satisfies the standard for the arrangement position of the rear bumper stipulated by law. The storage position is a position where the front portion Cf of the container C can be prevented from contacting the movable bumper 10 during the loading / unloading operation of the container C.

6 and 8, a pair of left and right locking devices that lock the arm portions 11b of the left and right movable bumpers 11 to the support portions 10b of the fixed bumper 10 at the overhang positions on the inner side in the vehicle width direction of each hanging frame 1c. 13 is provided.
FIG. 11 is an enlarged cross-sectional view of a main part of FIG.
A through hole 14 is formed on the upper surface of the horizontal plate 11b1 above the arm portion 11b, and the lower end of the boss portion 15 is fixed to the upper surface of the horizontal plate 11b1 above the through hole 14. A lock pin 16 is attached to the boss portion 15 so as to be movable up and down. The lock pin 16 is always urged downward by the urging force of a spring 17 that is an elastic member provided in the boss portion 15. On the other hand, the upper horizontal plate 10b1 of the fixed bumper 10 located below the horizontal plate 11b1 is formed with an engagement hole 18 through which the lock pin 16 can be engaged and disengaged. Thereby, when the movable bumper 11 is in the extended position, the movable bumper 11 is locked to the support portion 10b of the fixed bumper 10 at the extended position by engaging the lower end of the lock pin 16 with the engagement hole 18. The rotation is restricted.

  In FIG. 6, a bumper cylinder 41 as a bumper driving means for rotating the left and right movable bumpers 11 between an extended position and a retracted position is disposed between the left and right hanging frames 1c. The bumper cylinder 41 is a double-acting hydraulic cylinder, and is extended and contracted in the vehicle width direction by driving a hydraulic motor 42 fixed to the lower portion of the cylinder body 41a. An operation switch (not shown) for extending and retracting the bumper cylinder 41 is provided in the cab of the cargo handling vehicle V.

As the bumper cylinder 41 is driven, the left and right locking devices 13 are locked and unlocked and the left and right movable bumpers 11 are rotated at the base of the cylinder body 41a of the bumper cylinder 41 and the tip of the piston rod 41b. A pair of left and right interlocking mechanisms 40 for moving are connected. Hereinafter, the interlocking mechanism 40 will be described in detail.
FIG. 12 is a front view showing the rear part of the vehicle body frame 1, and FIG. 13 is an enlarged view of the main part of FIG. 12 showing the interlocking mechanism 40 on the piston rod 41 b side of the bumper cylinder 41.
In FIG. 12, the base portion of the cylinder body 41 a and the tip portion of the piston rod 41 b are respectively connected to one end of a connection bracket 43 by a pin 44.

13 and 11, the connection bracket 43 includes a connection part 45 formed of a pair of left and right flat plates, and a locking part 46 and a restriction part 47 that connect and fix the left and right connection parts 45 together. The piston rod 41 b of the bumper cylinder 41 is connected to the left and right connecting portions 45 by the pins 44 with the tip thereof being disposed between the left and right connecting portions 45.
The lower surface 45a of each connecting portion 45 is placed on the upper surface of the top plate 15a of the boss portion 15 which is a part of the locking device 13, and the connecting bracket 43 is attached to the top plate 15a when the bumper cylinder 41 is extended or contracted. The vehicle slides in the vehicle width direction (left-right direction in FIG. 13).

The locking portion 46 is formed with a locking hole 46b that can be engaged with and disengaged from the outer peripheral portion of the top plate 15a. As a result, when the connecting bracket 43 slides outward in the vehicle width direction (right side in FIG. 13), the outer peripheral portion of the top plate 15a is fitted into the locking hole 46b and the outer end surface 46a of the locking portion 46 is outside. However, it comes into contact with the outer peripheral surface of the boss 15.
The restricting portion 47 is fixed to the outer end surface of the connecting portion 45, and when the connecting bracket 43 slides inward in the vehicle width direction (left side in FIG. 13), the end surface 47a inside the restricting portion 47 is the top plate 15a. It comes to contact | abut to the outer peripheral surface.

In FIG. 11, the upper end portion 16 a of the lock pin 16 that is a part of the lock device 13 is arranged between the connecting portions 45 in the front and rear (left and right direction in FIG. 11). A pair of rollers 48 that roll on the upper surface of each connecting portion 45 are attached to the front and rear of the upper end portion 16 a so as to be rotatable about a pin 49. The interlock mechanism 40 includes a spring 17, a connection bracket 43, a roller 48, and a pin 49.
In FIG. 13, on the upper surface of each connecting portion 45, a horizontal guide surface 45b for guiding the rolling of the roller 48, a horizontal guide surface 45c formed at a position higher than the horizontal guide surface 62b, and both guide surfaces An inclined guide surface 45d is formed between 62b and 62c which is inclined outwardly upward.

  As a result, when the connecting bracket 43 slides in the vehicle width direction, the roller 48 rolls on the guide surfaces 45b to 45d, so that the lock pin 16 moves up and down to lock and unlock the lock device 13. be able to. Further, when the connecting bracket 43 slides in the vehicle width direction in the unlocked state of the locking device 13, the end surface 46 a of the locking portion 46 or the end surface 47 a of the restricting portion 47 comes into contact with the boss portion 15, respectively. The bumper 11 can be rotated back and forth with respect to the fixed bumper 10. The details of the operation mechanism for locking and unlocking the locking device 13 and rotating the movable bumper back and forth will be described later.

  12 and 8, an L-shaped front cover member 50 is fixed to the upper surface of the reinforcing frame 1c1 that connects the lower ends of the left and right hanging frames 1c. The vertical portion 50a of the front cover member is formed to extend to a position higher than the piston rod 41b in front of the piston rod 41b of the bumper cylinder 41. As a result, the piston rod 41b is prevented from being damaged by stones, muddy water, or the like that the rear wheel springs up while the vehicle is running. A flat buffer member 51 is fixed to the horizontal portion 50b of the front cover member 50 to prevent the hydraulic motor 42 from coming into contact with the upper surface of the reinforcing frame 1c1 due to vibration during traveling of the cargo handling vehicle V or the like. .

  Further, left and right ends of a substantially inverted L-shaped rear cover member 52 are fixed to the rear surfaces of the left and right hanging frames 1c (see FIGS. 12 and 8). The rear cover member 52 is disposed so as to cover the entire bumper cylinder 41 and the left and right locking devices 13 when viewed from the rear of the vehicle. Thus, when the container C is dumped and the contents in the container C are discharged (see FIG. 5), the contents adhere to the bumper cylinder 41 and the lock device 13 from the rear of the vehicle. The locking device 13 is prevented from being damaged. A number plate (not shown) is attached to the center of the rear cover member 52 in the vehicle width direction.

6 and 7, a pair of left and right lamp devices 25 are provided on the outside of each hanging frame 1 in the vehicle width direction. The lamp device 25 includes an attachment portion 25a whose base end portion is rotatably attached to the hanging frame 1c, and a lamp portion 25b fixed to the distal end portion of the attachment portion 25a.
The mounting portion 25a is formed of a channel material, and is attached to a mounting bracket 26 made of a channel material fixed to the outer surface of the upper portion of the hanging frame 1c so as to be pivotable back and forth around a vertical axis by a pin 27. . The lamp portion 25b has a direction indicator lamp and a brake lamp, and is suspended and fixed to the free end side of the mounting portion 25a. A reflection plate 28 is fixed to the upper surface of the mounting portion 25a.
With the above configuration, the lamp device 25 is tilted approximately 30 degrees toward the front side of the body frame 1 with respect to the appropriate position (FIG. 9) disposed on the outer side in the vehicle width direction of the rear portion of the body frame 1. It can be rotated between the retracted position (FIG. 10). The appropriate position is a position where the arrangement position of the lamp portion 25a with respect to the cargo handling vehicle V satisfies the standards for the arrangement position of the lamps stipulated by law. The retreat position is a position where the front portion Cf of the container C can be prevented from coming into contact with the ramp device 25 during the loading / unloading operation of the container C.

In FIG. 7 and FIG. 8, a connecting mechanism 29 is provided between the lamp device 25 and the movable bumper 11 to interlock the front-rear rotation of the ramp device 25 and the front-rear rotation of the movable bumper 11.
The coupling mechanism 29 has a coupling member 29 a that couples the mounting portion 25 a of the lamp device 25 and the arm portion 11 b of the movable bumper 11. The connecting member 29a is formed in an inverted Z shape, and its upper end is rotatably connected to the lower surface of the mounting portion 25a on the rotation center side by a bolt 29b and a nut 29c. The lower end portion of the connecting member 29a is rotatably connected to the upper surface of the arm portion 11b of the movable bumper 11 by a bolt 29d and a nut 29e.
With the above configuration, when the movable bumper 11 is rotated forward to the extended position, the lamp device 25 is rotated forward together with the movable bumper 11 via the coupling mechanism 29 and can move to an appropriate position (see FIG. 9). . When the movable bumper 11 is rotated backward to the retracted position, the lamp device 25 is rotated backward together with the movable bumper 11 via the coupling mechanism 29 and can move to the retracted position (see FIG. 10).

  8 and 9, a proximity sensor 30 is attached between the upper and lower horizontal plates 11b1 of the arm portion 11b of the movable bumper 11 via an attachment plate 11b3. The detection unit 30a of the proximity sensor 30 detects the connecting plate 10b3 of the fixed bumper 10 when the movable bumper 11 is in the extended position. The proximity sensor 30 is a B-contact type sensor (normally ON and turned OFF when a detection target is detected). As shown in FIG. 10, when the proximity sensor 30 is not in a detection state, that is, the movable bumper 11 is tensioned. When the vehicle is in a rotational position other than the exit position, a warning lamp (not shown) installed in the cab of the cargo handling vehicle V is lit to alert the operator. The buzzer may be sounded instead of or together with the warning lamp.

[Unloading work of container C when cargo handling vehicle V is stopped in parallel]
Next, the loading / unloading operation of the container C by the cargo handling vehicle V will be described.
In the operation of lowering the container C from the cargo handling vehicle V to the ground, first, the jack 8 at the storage position is rotated downward from the state in which the container C is mounted on the body frame 1 (see FIG. 1), and the grounding roller 8a. Is a protruding position (see FIG. 2) that approaches the ground. From this state, the cargo handling arm 5 is rotated backward. Specifically, the hook arm 5b is tilted rearward by the extension operation of the hook cylinder 7, and the container C is moved rearward on the left and right guide rollers 3. At this time, the lifting arm 5a can freely rotate with respect to the dump arm 4 by releasing the securing device (not shown).

  Next, when the lift cylinder 6 is extended, the lift arm 5a rotates backward together with the hook arm 5b. As a result, the container C is guided by the left and right guide rollers 3 and moves rearward on the vehicle body frame 1, and the rear portion thereof rotates downward with the rotation center of the left and right guide rollers 3 as a fulcrum. Land on the ground (see FIG. 4).

  When the lift cylinder 6 continues to extend and reaches the rearward rotation end position (see FIG. 2) by the maximum extension through the state of FIG. 3, the hook arm 5b faces downward and the container C is located behind the cargo handling vehicle V. Taken down to the ground. At this time, the movable bumper 11 and the lamp device 25 are in the protruding position and the appropriate position of the rear portion of the vehicle body frame 1, but as shown in FIGS. 2 and 3, the front portion Cf of the container C includes the rear bumper 9 and the lamp device. Therefore, the front portion Cf of the container C does not come into contact with the rear bumper 9 or the lamp device 25.

  Next, the container C is separated from the cargo handling vehicle V when the hook 5c at the tip of the hook arm 5b is removed from the lift bar Ce. After the separation, the jack 8 at the protruding position is rotated upward so that the grounding roller 8a is retracted from the ground (see FIG. 1), and the lowering operation of the container C is completed.

  If the lift cylinder 6 is extended in a state where the container C is mounted on the vehicle body frame 1, that is, a state where the hook arm 5b is not tilted (see FIG. 1), the lashing device (not shown) maintains the lashed state. Since the dump arm 4 and the lift arm 5a are tied together, as shown in FIG. 5, the arms 4 and 5a are integrally tilted backward to dump the container C, The contents in the container C can be discharged to the outside.

[Loading work of container C when loading vehicle V is stopped in parallel]
Next, the operation of loading the container C that has been lowered to the ground onto the body frame 1 will be described. First, the lift arm 5a is rotated together with the hook arm 5b to the rear end position. Thereafter, in front of the container C that is lowered to the ground, the cargo handling vehicle V is positioned so that the center line Xs in the vehicle width direction of the cargo handling vehicle V and the center line Xc in the width direction of the container C are positioned substantially in a straight line. Once stopped in parallel (see FIG. 14). From this state, the jack 8 in the storage position is rotated downward to a protruding position where the ground roller 8a approaches the ground (see FIG. 2).

  Next, the cargo handling vehicle V is moved backward, and the hook 5c at the tip of the hook arm 5b is engaged with the lift bar Ce at the front end of the container C (see FIG. 2). Thereafter, when the lift arm 5a is rotated forward together with the hook arm 5b by the contraction operation of the lift cylinder 6, the container C moves to the cargo handling vehicle V side while being lifted as shown in FIG. The main girder Ca moves further to the cargo handling vehicle V side while being guided by the guide roller 3 (see FIG. 4).

  At this time, the movable bumper 11 and the lamp device 25 are in the protruding position and the appropriate position of the rear portion of the vehicle body frame 1, but as shown in FIGS. 2 and 3, the front portion Cf of the container C includes the rear bumper 9 and the lamp device. Therefore, the front portion Cf of the container C does not come into contact with the rear bumper 9 or the lamp device 25.

  When the lift cylinder 6 is continuously contracted, the traveling roller Cc of the container C is separated from the ground. When the lift cylinder 6 is fully contracted and the lift arm 5a reaches the forward rotation end position, the front portion of the main beam Ca of the container C is placed on the vehicle body frame 1. When the hook cylinder 7 is contracted from this state, the hook arm 5b is rotated forward to be in a traveling state (see FIG. 1). Finally, the jack 8 at the projecting position is rotated upward to set the storage position (see FIG. 1) in which the ground roller 8a is retracted from the ground, and the loading operation of the container C is completed.

[Loading work of container C when cargo handling vehicle V stops diagonally forward]
When the container C is loaded onto the body frame 1 of the cargo handling vehicle V, the center line Xs and the center line Xc are arranged in a narrow place where the cargo handling vehicle V cannot be stopped in tandem in front of the container C as shown in FIG. Cannot be positioned on a substantially straight line. In this case, the container C is loaded in a state where the cargo handling vehicle V is stopped at an obliquely forward position of the container C (a state where the inclination angle of the center line Xc and the center line Xs is θ in FIG. 15). Hereinafter, the loading operation will be described in detail.

First, the cargo handling vehicle V is temporarily stopped at a diagonally forward position of the container C in a state where the lift arm 5a is rotated together with the hook arm 5b to the rear end position.
Next, the lock device 13 is unlocked and the movable bumper 11 is moved from the extended position to the retracted position. Specifically, first, the hydraulic motor 42 is driven, and the bumper cylinder 41 is contracted from the most extended state of FIGS. At this time, due to the difference in sliding resistance between the left and right connecting brackets 43 and the lock pins 16, the piston rod 41 b side tip part operates at a lower pressure than the base of the cylinder body 41 a, so the piston rod 41 b side connecting bracket 43 begins to move inward in the vehicle width direction.

  In the initial contraction of the bumper cylinder 41, the connecting bracket 43 moves inward in the vehicle width direction (left side in FIG. 13) when the connecting portion 45 slides on the top plate 15a of the boss portion 15 from the state shown in FIG. To do. Along with this, a pair of front and rear rollers 48 roll on the horizontal guide surface 45 b of each connecting portion 45. As shown in FIG. 16A, when the roller 48 starts to roll on the inclined guide surface 45d from the horizontal guide surface 45b, the roller 48 is pushed upward by the inclined guide surface 45d. The lock pin 16 (upper end portion 16 a) that supports 48 is gradually lifted upward against the urging force of the spring 17.

Further, when the connecting bracket 43 moves inward in the vehicle width direction (left side in FIG. 16) and the roller 48 moves from the inclined guide surface 45d to the horizontal guide surface 45c as shown in FIG. 16B, The lock pin 16 is further lifted upward, and the engagement with the engagement hole 18 of the fixed bumper 10 is released. As a result, the lock device 13 is held in the unlocked state, and the movable bumper 11 on the right side of FIG.
At the same time, the end surface 47a of the restricting portion 47 of the connecting bracket 43 comes into contact with the top plate 15a of the boss portion 15, and the sliding of the connecting bracket 43 with respect to the top plate 15a is restricted. As a result, the roller 48 stops rolling on the horizontal guide surface 45c.

  When the bumper cylinder 41 is further contracted from this state, the end surface 47a of the restricting portion 47 presses the top plate 15a of the boss portion 15 inward in the vehicle width direction, so that this pressing force is movable via the boss portion 15. It acts on the arm portion 11 b of the bumper 11. Then, in FIG. 6, a force (rotational moment) that tries to rotate counterclockwise about the pin 12 acts on the right arm portion 11 b. As a result, the arm portion 11b rotates counterclockwise, and the right movable bumper 11 rotates forward. Then, as shown in FIG. 18, the arm portion 11b abuts against the rear surface of the hanging frame 1c, so that its rotation is restricted, and the movable bumper 11 stops rotating at the retracted position (see also FIG. 16 (c)). ). When the right movable bumper 11 is rotated forward, the right lamp device 25 and the reflecting plate 28 are also rotated forward about the pin 27 by the connecting mechanism 29 and moved to the retracted position (see FIG. 18).

When the bumper cylinder 41 is further contracted from the state shown in FIG. 18, the rotation of the arm portion 11b of the right movable bumper 11 is restricted as described above, so that the connecting bracket 43 on the cylinder body 41a side is connected in the vehicle width direction. Start moving inward. Then, as in the case of the piston rod 41b side described above, the left locking device 13 is unlocked by interlocking the members, and the left movable bumper 11 rotates forward.
When the bumper cylinder 41 is fully contracted, the left movable bumper 11 stops rotating at the retracted position (see FIG. 19). In conjunction with the movable bumper 11 on the left side, the lamp device 25 and the reflector 28 also rotate forward about the pin 27 and move to the retracted position.
At this time, the arm portion 11b of the left movable bumper 11 rotates forward, so that the proximity sensor 30 is in a non-detection state, and a warning lamp installed in the cab of the cargo handling vehicle V is lit. Thereby, it is possible to prevent the worker from accidentally running the cargo handling vehicle V while the movable bumper 11 is kept in the retracted position after the loading operation is completed.

  When the movement of the left and right movable bumpers 11 to the storage position is completed, the cargo handling vehicle V is retracted, and the hook 5c at the tip of the hook arm 5b is engaged with the lift bar Ce of the container C (see FIG. 2). At this time, since the movable bumper 11 and the lamp device 25 are in the retracted position and the retracted position, the front wall Cd of the container C (particularly the left corner of the front wall Cd) is connected to the rear bumper 9 (movable bumper 10) and the lamp device 25. Contact with the left end can be prevented.

  Next, the lift arm 5a is rotated slightly upward together with the hook arm 5b so that the leg Cb of the container C is lifted from the ground (see FIG. 3), and the cargo handling vehicle V is moved back and forth while maintaining this state. . When this back-and-forth movement is repeated a plurality of times, the container C is pushed and pulled in the front-rear direction by the hook 5c, and its direction gradually changes. That is, the inclination angle θ between the center line Xc and the center line Xs gradually decreases, and the center line Xc and the center line Xs are eventually positioned on a straight line (see FIG. 14). In this state, the cargo handling vehicle V is stopped, the lift arm 5a is fully rotated forward as described above, and the container C is loaded on the vehicle body frame 1 (see FIG. 1).

When the cargo handling vehicle V is moved back and forth as described above, since the movable bumper 11 and the ramp device 25 are in the retracted position and the retracted position, the leg Cb of the container C is floated from the ground, and the leg Cb is moved to the movable bumper 11 or the ramp. When the height is substantially the same as (or higher than) the device 25, the left leg Cb of the container C contacts the rear bumper 9 (movable bumper 10) and the left end of the lamp device 25. Can be prevented. Further, as the height of the leg portion Cb is increased, the total length of the cargo handling vehicle V and the container C is shortened, and it is possible to move back and forth in a narrower place.
Further, by holding the bumper cylinder 41 in the most contracted state, it is possible to restrict the movable bumper 11 and the lamp device 25 from rotating backward from the retracted position and the retracted position. Therefore, it is possible to prevent the movable bumper 11 and the lamp device 25 from interfering with the leg portion Cb while the cargo handling vehicle V is moving back and forth.

  After the container C is loaded on the vehicle body frame 1, the movable bumper 11 is moved from the retracted position to the extended position, and the movable bumper 11 is locked at the extended position by the lock device 13. Specifically, first, the hydraulic motor 42 is driven, and the bumper cylinder 41 is extended from the most contracted state of FIG. At that time, the connecting bracket 43 on the piston rod 41b side starts to move forward in the vehicle width direction due to the sliding resistance difference as described above.

In the initial extension of the bumper cylinder 41, the connecting bracket 43 moves from the state shown in FIG. 17A to the outside in the vehicle width direction (the right side in FIG. 17) by the connecting portion 45 sliding on the top plate 15a of the boss portion 15. Move to). Accordingly, the pair of front and rear rollers 48 roll on the horizontal guide surface 45 c of each connecting portion 45.
17B, when the horizontal guide surface 45c moves outward in the vehicle width direction of the roller 48 by the movement of the connection bracket 43, the roller 48 moves downward together with the lock pin 16 by the urging force of the spring 17. Although the lower end of the lock pin 16 comes into contact with the upper surface of the support portion 10b of the fixed bumper 10, its downward movement is restricted.
As shown in FIG. 17B, when the connecting bracket 43 moves outward in the vehicle width direction, the outer peripheral portion of the top plate 15a is fitted in the locking hole 46b of the locking portion 46, and the locking portion 46 The end surface 46 a comes into contact with the outer peripheral surface of the boss portion 15.

When the bumper cylinder 41 is further extended from this state, the end surface 46a of the locking portion 46 presses the outer peripheral surface of the boss portion 15 outward in the vehicle width direction, so that this pressing force is movable via the boss portion 15. It acts on the arm portion 11 b of the bumper 11. Then, in FIG. 19, a force (rotational moment) that tries to rotate clockwise about the pin 12 acts on the arm portion 11 b of the right movable bumper 11. As a result, the arm portion 11b rotates in the clockwise direction, and the right movable bumper 11 rotates backward to move to the overhang position. Further, when the right movable bumper 11 is rotated backward, the right lamp device 25 and the reflecting plate 28 are also rotated backward about the pin 27 by the connecting mechanism 29 and moved to an appropriate position.
At that time, the end of the connecting bracket 43 on the inner side in the vehicle width direction is pushed up in the direction A in FIG. Since it contacts the lower surface, it is possible to prevent the connecting bracket 43 from being pushed up in the A direction and falling off the boss portion 15.

  When the right movable bumper 11 moves to the overhang position, the lock pin 16 moves above the engagement hole 18 of the fixed bumper 10 (see FIG. 17C) and moves downward by the biasing force of the spring 17. It engages with the engagement hole 18 (see FIG. 13). As a result, the right movable bumper 11 is locked to the fixed bumper 10 at the extended position, and its rotation is restricted. Further, since the outer peripheral portion of the top plate 15a is fitted into the locking hole 46b of the locking portion 46, and the end surface 46a of the locking portion 46 contacts the outer peripheral surface of the boss portion 15, the connecting bracket 43 on the piston rod 41b side. Is restricted from sliding outward in the vehicle width direction with respect to the boss portion 16.

When the bumper cylinder 41 is further extended, the connecting bracket 43 on the cylinder body 41a side starts to move outward in the vehicle width direction. Then, as in the case of the piston rod 41b described above, the movable bumper 11 on the left side of FIG.
When the bumper cylinder 41 is extended to the maximum, the left movable bumper 11 stops rotating at the extended position and is locked at the extended position by the left lock device 13 (see FIG. 6). In conjunction with the movable bumper 11 on the left side, the lamp device 25 and the reflecting plate 28 also rotate backward about the pin 27 and move to an appropriate position.
Thereby, the loading operation of the container C is completed.

At that time, the arm portion 11b of the left movable bumper 11 rotates backward, so that the proximity sensor 30 detects the connecting plate 10b3 of the fixed bumper 10, and the warning lamp in the cab of the cargo handling vehicle V is turned off. Thereby, the worker can confirm that the cargo handling vehicle V is in a state where it can travel.
Further, when the rotation of the movable bumper 11 is restricted by the lock device 13, when a subsequent vehicle collides with the movable bumper 11, the collision load is transferred from the lock pin 16 of the lock device 13 via the boss portion 15 and the support portion 10 b. It can be received by the hanging frame 1c, and the rush preventing function as the rear bumper 9 can be appropriately exhibited.

According to the cargo handling vehicle V of the present embodiment configured as described above, the rear bumper 9 is configured by the fixed bumper 10 and the movable bumper 11, and the movable bumper 11 is configured by the bumper cylinder 41 in the vehicle width direction of the fixed bumper 10. The container C can be loaded from the overhanging position disposed outside the container C to the storage position that is not in contact with the front portion Cf of the container C. When performing the lowering work, the movable bumper 11 can be moved to the storage position. Thereby, it is possible to prevent the rear bumper 9 from being damaged by the front portion Cf of the container C coming into contact with the outer end portion of the rear bumper 9 during the loading / unloading operation of the container C.
Further, since only the movable bumper 11 which is a part of the rear bumper 9 is stored, only the storage space for the movable bumper 11 needs to be secured at the rear part of the cargo handling vehicle V, and the storage space for the entire rear bumper 9 is ensured. There is no need. Therefore, compared to the conventional case where the entire rear bumper 9 is stored, the types of vehicles to which the rear bumper structure can be applied are not limited.

  Further, since the movable bumper 11 can be locked to the support portion 10b of the fixed bumper 10 at the extended position by the locking device 13, when the following vehicle collides with the movable bumper 11 during the traveling of the cargo handling vehicle V, The collision load can be received by the fixed bumper 10 via the lock device 13. Therefore, it is possible to prevent the bumper cylinder 41 from being damaged by the collision load.

  Further, since the bumper cylinder 41 can also serve as a driving means for unlocking the lock device 13 via the interlock mechanism 40, it is not necessary to provide a driving means dedicated to unlocking. Therefore, the manufacturing cost of the cargo handling vehicle V can be further reduced.

  In addition, the left and right locking devices 13 can be locked and unlocked via the interlocking mechanism 40 and the left and right movable bumpers 11 can be rotated back and forth by a single bumper driving means (bumper cylinder 41). Compared with the case where the driving device is provided for each of the locking device 10 and each movable bumper 11, the manufacturing cost of the cargo handling vehicle V can be reduced.

Further, during the loading / unloading operation of the container C, the front Cf of the container C is moved to the retreat position by moving the ramp device 25 disposed on the outer side in the vehicle width direction of the rear portion of the body frame 1 to the retreat position. Can be prevented from touching. Thereby, it is possible to prevent the lamp device 25 from being damaged.
In addition, since the lamp device 25 can be moved in conjunction with the movement of the movable bumper 11 by the connecting mechanism 29, both of them can be moved quickly.

[Cargo handling vehicle according to another embodiment]
FIG. 20 is a main part enlarged view showing an interlocking mechanism according to the second embodiment of the present invention.
The second embodiment is different from the first embodiment in that the spring 17 in the first embodiment is not provided and the shape of the connecting portion 45 of the connecting bracket 43 is changed. That is, in the first embodiment, the lock pin 16 is moved downward by the urging force of the spring 17, but in the second embodiment, both are different in that the connecting bracket 60 plays the role.

Hereinafter, the second embodiment will be described in detail. In addition, among this embodiment, what is the same structure as 1st embodiment is shown with the same code | symbol as 1st embodiment.
The lower surfaces 61 a of the pair of left and right connecting portions 61 constituting the connecting bracket 60 are placed on the upper surface of the top plate 15 a of the boss portion 15 that is a part of the locking device 13. 60 slides in the vehicle width direction (left-right direction in FIG. 20) with respect to the top plate 15a.

  Each connecting portion 61 is formed with a guide hole 62 for guiding the rolling of the roller 48. On the lower surface of the guide hole 62, there is a horizontal guide surface 62b, a horizontal guide surface 62c formed at a position higher than the horizontal guide surface 62b, and a downwardly inclined guide that is inclined outwardly between the guide surfaces 62b and 62c. A surface 62d is formed. An upper inclined guide surface 62e is formed on the upper surface of the guide hole 62. The upper inclined guide surface 62e is inclined outwardly so as to be parallel to the inclination of the lower inclined guide surface 62d. The interlocking mechanism 63 in the present embodiment includes a connection bracket 60, a roller 48, and a pin 49.

Next, in the second embodiment, the rotation operation of the movable bumper 11 will be described with reference to FIGS. 21 and 22.
First, when the movable bumper 11 is moved from the extended position to the retracted position, the hydraulic motor 42 is driven, and the bumper cylinder 41 is contracted from the most extended state of FIG. At that time, as in the first embodiment, the connecting bracket 60 on the piston rod 41b side starts to move inward in the vehicle width direction.

  In the initial contraction of the bumper cylinder 41, the connecting bracket 60 moves inward in the vehicle width direction (left side in FIG. 20) when the connecting portion 61 slides on the top plate 15a of the boss portion 15 from the state shown in FIG. To do. Accordingly, the pair of front and rear rollers 48 roll on the horizontal guide surface 62b of each connecting portion 61. As shown in FIG. 21A, when the roller 48 starts rolling on the lower inclined guide surface 62d from the horizontal guide surface 62b, the roller 48 is pushed upward by the lower inclined guide surface 62d. The lock pin 16 (upper end portion 16a) that supports the roller 48 is gradually lifted upward.

Further, when the connecting bracket 60 moves inward in the vehicle width direction (left side in FIG. 21) and the roller 48 moves from the lower inclined guide surface 62d to the horizontal guide surface 62c, as shown in FIG. 21B. The lock pin 16 is further lifted upward, and the engagement with the engagement hole 18 of the fixed bumper 10 is released. As a result, the lock device 13 is held in the unlocked state, and the movable bumper 11 on the right side of FIG.
At the same time, the end surface 47a of the restricting portion 47 of the connecting bracket 60 comes into contact with the top plate 15a of the boss portion 15, and the sliding of the connecting bracket 60 with respect to the top plate 15a is restricted. As a result, the roller 48 stops rolling on the horizontal guide surface 62c.

  When the bumper cylinder 41 is further contracted from this state, the end surface 47a of the restricting portion 47 presses the top plate 15a of the boss portion 15 inward in the vehicle width direction, so that the right side movable portion is movable as in the first embodiment. A rotational moment acts on the arm portion 11 b of the bumper 11. As a result, the arm portion 11 b rotates counterclockwise, and the right movable bumper 11 rotates forward together with the right lamp device 25 and the reflecting plate 28. Then, as shown in FIG. 18, the arm portion 11b abuts against the rear surface of the drooping frame 1c, so that its rotation is restricted, and the movable bumper 11, the lamp device 25, and the reflector 28 are rotated at the retracted position and the retracted position. The movement stops (see also FIG. 21 (c)).

When the bumper cylinder 41 is further contracted from the state shown in FIG. 18, the rotation of the arm portion 11b of the right movable bumper 11 is restricted as described above, so that the connecting bracket 60 on the cylinder body 41a side is connected in the vehicle width direction. Start moving inward. Then, as in the case of the piston rod 41b side described above, the left locking device 13 is unlocked by interlocking the members, and the left movable bumper 11 rotates forward.
When the bumper cylinder 41 is contracted to the maximum, the left movable bumper 11 is rotated and stopped at the retracted position and the retracted position together with the left lamp device 25 and the reflecting plate 28 (see FIG. 19).

  Next, the case where the movable bumper 11 is moved from the retracted position to the extended position will be described. First, the hydraulic motor 42 is driven, and the bumper cylinder 41 is extended from the most contracted state of FIG. At that time, similarly to the first embodiment, the connecting bracket 60 on the piston rod 41b side starts to move outward in the vehicle width direction.

In the initial stage of expansion of the bumper cylinder 41, the connecting bracket 60 moves from the state shown in FIG. 22A to the outside in the vehicle width direction (the right side in FIG. 22) by the connecting portion 61 sliding on the top plate 15a of the boss portion 15. Move to). Accordingly, the pair of front and rear rollers 48 roll on the horizontal guide surface 62 c of each connecting portion 61.
22B, when the horizontal guide surface 62c moves outward in the vehicle width direction of the roller 48 by the movement of the connecting bracket 60, the roller 48 tries to move downward together with the lock pin 16 by its own weight. However, when the lower end of the lock pin 16 comes into contact with the upper surface of the support portion 10b of the fixed bumper 10, the downward movement thereof is restricted.
Furthermore, as shown in FIG. 22B, the upper inclined guide surface 62e of the connecting portion 61 contacts the roller 48 in a state where the downward movement of the lock pin 16 is restricted.

  When the bumper cylinder 41 is further extended from this state, the upper inclined guide surface 62e of the connecting portion 61 presses the roller 48 outward in the vehicle width direction, so that this pressing force is transmitted via the boss portion 15 to the movable bumper 11. Acting on the arm portion 11b. Then, in FIG. 19, a force (rotational moment) that tries to rotate clockwise about the pin 12 acts on the arm portion 11 b of the right movable bumper 11. As a result, the arm portion 11b rotates in the clockwise direction, and the right movable bumper 11 rotates backward together with the right lamp device 25 and the reflecting plate 28, and moves to the overhang position and the appropriate position.

  At that time, as shown in FIG. 22 (b), the pressing force acts in the direction of pressing the roller 48 downward by the inclination of the upper inclined guide surface 62e, but the lock for supporting the roller 48 as described above. Since the downward movement of the pin 16 is restricted, the roller 48 can be prevented from rolling on the upper inclined guide surface 62e while moving downward.

  When the right movable bumper 11 moves to the overhang position, the lock pin 16 moves above the engagement hole 18 of the fixed bumper 10 (see FIG. 22C). At this time, the lock pin 16 tends to move downward due to its own weight, but the roller 48 comes into contact with the lower inclined guide surface 62d, and the downward rotation of the lock pin 16 is restricted.

  When the bumper cylinder 41 is further extended from this state, the connecting bracket 60 moves outward in the vehicle width direction, whereby the roller 48 rolls on the lower inclined guide surface 62d, and the lock pin 16 is moved together with the roller 48. Move downward gradually. As shown in FIG. 20, when the roller 48 moves from the lower inclined guide surface 62d onto the horizontal guide surface 62b, the lock pin 16 engages with the engagement hole 18. As a result, the right movable bumper 11 is locked to the fixed bumper 10 at the extended position, and its rotation is restricted. Further, since the outer peripheral portion of the top plate 15a is fitted into the locking hole 46b of the locking portion 46, and the end surface 46a of the locking portion 46 contacts the outer peripheral surface of the boss portion 15, the connecting bracket 60 on the piston rod 41b side. Is restricted from sliding outward in the vehicle width direction with respect to the boss portion 16.

When the bumper cylinder 41 is further extended, the connecting bracket 60 on the cylinder body 41a side starts to move outward in the vehicle width direction. Then, similarly to the case of the above-described piston rod 41b side, the left movable bumper 11 rotates backward in conjunction with each member.
When the bumper cylinder 41 is extended to the maximum, the left movable bumper 11 is stopped to rotate together with the left lamp device 25 and the reflecting plate 28 at the extended position, and is locked at the extended position by the left lock device 13. (See FIG. 6).

  According to the cargo handling vehicle V of the second embodiment configured as described above, the lock pin 16 can be reliably moved from the unlocked state to the locked state without using a spring. Therefore, durability can be improved compared with the case where a spring is used.

  The cargo handling vehicle of the present invention is not limited to the above-described embodiments, and may be of other forms within the scope of the present invention. For example, in each of the embodiments described above, the state in which the movable bumper 11 is rotated forward about the vertical axis is the storage position. However, the movable bumper 11 is provided so as to be capable of rotating 180 degrees backward from the extended position. The storage position may be a state in which the fixed bumper 10 is folded rearward. In addition, the movable bumper 11 is provided so as to be rotatable up and down around the horizontal axis, and the movable bumper 11 is folded and rotated 180 degrees above the fixed bumper 10 from the extended position, or below the fixed bumper 10 from the extended position. It is also possible to set the retracted position to a state where it is folded and rotated 180 degrees.

Moreover, although the movable bumper 11 is provided on both sides of the fixed bumper 10 in the vehicle width direction, it may be provided only on one side.
Furthermore, although the lamp device 25 and the reflecting plate 28 are rotated together with the movable bumper 11, the lamp device 25 and / or the reflecting plate 28 may be fixed to the vehicle body frame 1.

  Although the movable bumper 11 is stored when the container C is loaded, the movable bumper 11 can be stored when the container C is lowered. For example, as shown in FIG. 3, immediately before the container C is lowered just behind the cargo handling vehicle V, the rearward rotation of the cargo handling arm 5 is temporarily stopped, and the movable bumper 11 is rotated to the retracted position. If the cargo handling vehicle V is moved back and forth diagonally forward of the container C in this state, the inclination angle θ between the center lines Xs and Xc gradually increases, contrary to the above description, and the container C as shown in FIG. Can be lowered obliquely behind the cargo handling vehicle V. In this case, it is possible to prevent the leg Cb of the container C from interfering with the movable bumper 11 while the cargo handling vehicle V is moving back and forth.

In addition, the bumper cylinder 41 can rotate the movable bumper 11 forward and backward, but can only rotate forward to move the movable bumper 11 to the retracted position, and rotate the movable bumper to the extended position. The movement may be separately moved by an urging force of the elastic member.
In addition, as a bumper driving means, a pair of left and right locking devices 13 are locked and unlocked by a single bumper cylinder 41 and a pair of left and right movable bumpers 11 are rotated back and forth. Alternatively, a dedicated drive cylinder may be provided for each movable bumper 11.

Further, the expansion / contraction operation of the bumper cylinder 41 is performed by the dedicated hydraulic motor 42, but may be performed by a hydraulic unit that is a drive source such as the lift cylinder 6.
The expansion / contraction operation of the bumper cylinder 41 is performed by an operation switch (not shown). However, the expansion / contraction operation may be automatically performed in conjunction with the loading / unloading operation of the container C.
In addition, the locking device 13 locks the movable bumper 11 to the fixed bumper 10, but may lock the movable bumper 11 to the vehicle body frame 1 (such as the hanging frame 1c).
The movable bumper 11 is locked at the extended position by the locking device 13, but may be locked at the extended position by restricting the expansion and contraction operation of the bumper cylinder 41.

DESCRIPTION OF SYMBOLS 1 Body frame 5 Handling arm 5c Hook 9 Rear bumper 10 Fixed bumper 11 Movable bumper 13 Locking device 25 Lamp device 29 Connection mechanism 40 Interlocking mechanism 41 Bumper cylinder (bumper drive means)
C Container Ce Lift bar (engagement part)
S cargo handling drive means V cargo handling vehicle

Claims (6)

A vehicle body frame capable of mounting a container having an engaging portion at a front portion;
A cargo handling arm having a base end attached to the vehicle body frame side so as to be capable of pivoting back and forth, and having a hook that can be engaged and disengaged with the engaging portion at the tip.
Cargo handling drive means for loading and unloading the container between the vehicle body frame and the ground behind the vehicle body frame by rotating the cargo handling arm with the hook engaged with the engaging portion. ,
A cargo handling vehicle comprising a rear bumper disposed at a rear portion of the vehicle body frame,
The rear bumper includes a fixed bumper fixed to the vehicle body frame in a state of protruding rearward of the vehicle body frame, an overhanging position disposed on the outer side in the vehicle width direction of the fixed bumper, and the unloading operation. A movable bumper that is movable between the front portion of the container and a storage position that is non-contacting,
A cargo handling vehicle comprising bumper driving means for moving the movable bumper from the extended position to the retracted position.   The cargo handling vehicle according to claim 1, further comprising a locking device that locks the movable bumper to the fixed bumper or the vehicle body frame at the extended position.   The cargo handling vehicle according to claim 2, further comprising an interlocking mechanism that unlocks the locking device in accordance with the driving of the bumper driving means. A pair of the movable bumper and the locking device are disposed on both sides of the fixed bumper in the vehicle width direction,
The single bumper driving means is connected to the pair of interlocking mechanisms, and the pair of locking devices are unlocked by the bumper driving means, and the pair of movable bumpers are moved from the extended position to the retracted position. The cargo handling vehicle according to claim 3.   A ramp device is further provided that is movable between an appropriate position arranged on the outer side in the vehicle width direction of the rear part of the vehicle body frame and a retracted position that is not in contact with the front part of the container during loading and unloading operations. The cargo handling vehicle according to claim 1.   Linking the movement of the movable bumper and the movement of the ramp device, the movable bumper is in the proper position when the movable bumper is in the extended position, and the movable bumper is in the retracted position when the movable bumper is in the retracted position. The cargo handling vehicle according to claim 5, further comprising:

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