JPH054259B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a container tilting lock mechanism in a cargo handling device for a cargo handling vehicle, and more specifically, to a container tilting mechanism for loading and unloading a container detachably supported by a lift arm onto a vehicle body. The present invention also relates to a container tilting mechanism in a cargo handling device that is capable of dumping a container and discharging the contents from the vehicle.

[Conventional technology]

A cargo handling vehicle 1 shown in FIG. 11 that transports a container 3 is equipped with a cargo handling device 2 for loading and unloading the container 3 onto the vehicle body and for discharging the contents from the container 3 on the vehicle. In order to handle the container 3 with the device 2, it is necessary to support the container 3, and support shafts 4, 4 are protruded from the left and right sides of the container 3.

In order to receive the support shafts 4, 4, the cargo handling device 2 is provided with lift arms 5, 5 on which support portions 6 are formed, and are attached to the vehicle body 7 via a hydraulic cylinder 8 and a support shaft 9 so as to be rotatable forward and backward. . An example of this type of lift arm is described in Japanese Patent Publication No. 31-3170, but in any case, the container
The left and right parts of the container 3 are supported by lift arms 5, 5, and in the example shown in FIG. Care has been taken to ensure that it does not wobble. Then, when the lift arm 5 is rotated forward, the container 3 is loaded onto the vehicle body 7,
When the container 3 is reversed, it is unloaded onto the ground.

By the way, in order to be able to discharge the stored items from the container 3 on the vehicle to the rear of the vehicle,
Dump pin 1 on the outside of the left and right lift arms 5, 5
0 is provided, and container side wall holes 11 are bored on both sides of the container 3. When the dump pin 10 advances to the inside of the vehicle body and is fitted into the container side wall hole 11, the container 3 and the lift arm 5 are integrated at the position of the dump pin 10, so when the lift arm 5 is rotated backwards, container 3
is dumped largely from the horizontal position, and the contents can be discharged from the container 3 in the dumping position.

[Problem to be solved by the invention]

As shown in FIG. 12, a mechanism 12 for inserting and removing the dump pin 10 for discharging the contents of the container 3 described above is provided on the outer surface 5a of the lift arm 5. The insertion/extraction mechanism 12 is a cylinder 13
When the link 14 is in a dogleg shape and is swung around the fulcrum 15 attached to the outer surface 5a, the dump pin 10 is inserted into the container side wall hole 1.
Go in and out of 1.

However, in this insertion/removal mechanism 12, the cylinder 13, the link 14, and the fulcrum 15 are in a state where they largely protrude outward from the outer surface 5a. the result,
There is a problem in that the protrusion itself becomes an obstacle when the vehicle is running. In addition, due to legal regulations regarding vehicle width, the width of the container 3 is reduced in consideration of its protrusion, resulting in problems such as a reduction in volume.

By the way, JP-A-58-16934 discloses a hook mechanism that can prevent a change in the relative posture of a container with respect to a lift arm to some extent when the container is dumped.

The hook mechanism consists of a pin attached to a bracket provided at the bottom of the container's inclined rear wall that extends in the vehicle width direction, and a cylinder extending and retracting on both sides of the rear end of the vehicle that allows it to rotate forward and backward. It consists of an attached inverted J-shaped hook.

According to such a mechanism, if the hook is locked to a pin on the inclined rear wall of the container before lifting the container with the lift arm, the container can be lifted up rather than being rotated backwards and dumped. cargo can be discharged.

However, it is inevitable that the triangle whose vertices are the support shaft of the lift arm, the container suspension point at the tip of the lift arm, and the pin engaged with the hook is deformed by the backward rotation of the lift arm. this is,
This is because the aforementioned hook is attached to the vehicle body, and even if the lift arm is rotated backwards, the center of rotation of the hook is restrained on the vehicle chassis. the result,
The engagement portion between the pin and the hook shifts little by little as the dumping angle changes, and the contact surfaces of the pin and the hook shift, for example, in the vertical direction on the ventral surface of the hook.

In order to avoid this and prevent the hook from separating from the pin, it is not disclosed, but the shape of the inverted J-shaped hook must be designed to maintain engagement even if the contact surface changes. However, there is a problem that the hook mechanism cannot be used as a stable engagement device in accordance with the actual situation.

Not only this, but if the contents of the container are biased toward the front, the container will be tilted slightly forward, so when the lift arm lifts the container, the pins will engage at the back of the hook. . but,
When the container is subsequently dumped, at some point the contents begin to shift backward inside the container, and the resulting movement of the center of gravity of the container causes the container being dumped to roll excessively backwards.

This is because the hook is only bent into a hook shape at the tip, and is not shaped to prevent the container from rolling backwards due to movement of the center of gravity. That is, the pin will be slightly separated from the position where it was in contact with the hook at that time. The container is further dumped, but
When the contents are discharged, the center of gravity of the container changes again, so that the container immediately pivots in the opposite direction, and the above-mentioned pin collides with the original contact surface of the hook. At this time, there is a problem in that an impact force is applied to the pins and hooks, and the pins and hooks are likely to be damaged.

The present invention was made in order to solve the above-mentioned problem, and its purpose is to avoid the situation in which dump pins, etc., which are necessary for smoothly ejecting stored items from the vehicle, protrude outside the lift arm. At the same time, the container capacity can be increased by expanding the effective width of the vehicle carrying the container, and the dumping pin used to dump the container can also be moved relative to the lift arm by rotating the lift arm back and forth. A lock for tilting a container in a cargo handling device for a cargo handling vehicle that maintains the positional relationship and has a structure that makes it difficult for the container to change its posture due to changes in the center of gravity during container dumping, thereby suppressing damage to dump pins, etc. It is to provide a mechanism.

[Means to solve the problem]

The present invention supports the left and right sides of the container by a pair of lift arms provided on the left and right sides of the car body, which can rotate in synchrony in the front and rear directions around a support shaft extending in the left-right direction of the car body, and lifts the container by operating a hydraulic cylinder. Applicable to cargo handling equipment for cargo handling vehicles that can load containers on the ground at the rear of the vehicle onto the vehicle by rotating the arm forward, and unload containers on the ground at the rear by rotating the lift arm backwards. be done.

Its features are as shown in FIGS. 1 and 2, at the rear ends of both lift arms 5, 5,
A connecting shaft 15 is attached to synchronize the forward and backward rotation of the lift arm 5. Both ends 1 of the connecting shaft 16 located between both lift arms 5, 5
6a, 16a, in order to tilt the container 3, a dump pin 17 that moves back and forth in the left and right direction is attached to the pair of left and right lift arms 5, 5 so as to engage with a dump pin hole 21 provided in the rear bottom 3R of the container 3. installed inside. The dump pin 17
A locking cylinder 18 for advancing and retracting the dump pin 17 and a support body 20 for guiding the dump pin 17 to move forward and backward are connected to the connecting shaft 16 located between both lift arms 5, 5.
It is attached to the top.

[Effect]

When the container 3 mounted on the vehicle body 7 is tilted, the locking cylinders 18 attached to both ends 16a of the connecting shaft 16 are extended.
Each of the dump pins 17 whose tips are held by a pair of supports 20 moves inward and is inserted into the dump pin hole 21 of the container 3. As a result, the container 3 and both lift arms 5, 5 are integrated via the dump pin 17. When the hydraulic cylinder 8 is extended, the lift arm 5 rotates backward together with the connecting shaft 16 and the dump pin 17.

The container 3, which is supported in a horizontal position by a pair of left and right lift arms 5, 5, is dumped as the lift arms 5 rotate backward, and the contents inside the container 3 are discharged. Even if the contents inside the container 3 move during dumping, the container 3 can be kept in a position relative to the lift arm 5 by a dump pin 17 attached to a connecting shaft 16 that moves with the tilting of the lift arm 5. Container 3 is dumped stably with almost no change.

When the hydraulic cylinder 8 is contracted, the container 3 is rotated forward together with the lift arm 5, returned to a horizontal position, and mounted on the vehicle body 7.

On the other hand, when unloading the container 3 to the rear of the vehicle body 7, the locking cylinder 18 is contracted, the dump pin 17 is retracted, and the container 3 is released from the lift arm 5. When the hydraulic cylinder 8 is extended, the container 3 is lowered to the ground by the backward rotation of the lift arm 5 while maintaining a horizontal posture. When loading the container 3 onto the vehicle body 7, the hydraulic cylinder 8 is reduced and the container 3 is loaded onto the vehicle body 7 while maintaining a horizontal attitude.

The lock mechanism for dumping the container 3 is always located inside the lift arms 5, 5, and does not protrude toward the vehicle side as shown in FIG. is not an obstacle. Conversely, the space on the loading platform can be secured accordingly, and the container to be loaded can be made larger.

〔Effect of the invention〕

According to the present invention, contents in the container can be discharged from the vehicle, and a locking mechanism for tilting the container is provided on the connecting shaft located inside the lift arm, so that a dump pin or the like can be moved to the outside of the lift arm. You can eliminate the protrusion. Therefore, in a cargo handling vehicle whose vehicle width is restricted by law, it is possible to have a wide effective space for carrying a container, and furthermore, it is possible to increase the container capacity.

In addition, the locking mechanism that realizes container dumping is located on the connecting shaft, and when the lift arm moves back and forth, they move together, so there is very little change in relative position with the container, and the container can be moved during dumping. Damage to the locking mechanism due to undesired changes in posture or impacts caused by such changes is avoided.

〔Example〕

The present invention will be described in detail below based on examples thereof.

FIG. 2 shows an example of a cargo handling vehicle 1, in which a container 3, which can be attached to and detached from a cargo handling device 2, can be loaded and unloaded onto a vehicle body 7. The car body 7 has a container 3
A pair of left and right lift arms 5, 5 (see Figure 3) are attached to support and unload the vehicle body 7.
It is supported so as to be rotatable back and forth around a support shaft 9 fixed to.

A recess-shaped support portion 6 is formed on the tip side of the main body of the lift arm 5, and an edge portion is provided in the front-rear direction. (see FIG. 3) to support the container 3. Support shaft 4
is attached above the center of gravity of the container 3, and is mounted on the support section 6 during cargo handling operation. In addition,
When the lift arm 5 rotates back and forth, the support shaft 4 rotates and slides on the support portion 6 and rolls in response to the back and forth rotation, thereby loading and unloading the container 3.

The lift arms 5, 5 are adapted to be rotated forward and backward by the expansion and contraction operations of a hydraulic cylinder 8 that is swingably mounted on the vehicle body 7. That is, the tip of the piston rod of the hydraulic cylinder 8 is connected to the pin shaft 8.
It is attached to both the left and right lift arms 5 via A, and when the piston rod is extended, the lift arms 5
is rotated backwards, and when it is reduced, it is rotated forward. A connecting shaft 16, which is, for example, a hollow tube, is attached to the rear ends of the left and right lift arms 5, 5, in order to synchronize the forward and backward rotation of both.
The rigidity between the lift arms 5 and 5 can also be increased.

As described above, in the cargo handling vehicle to which the present invention is applied, a pair of lift arms 5 provided on the left and right sides of the vehicle body are rotatable in the front and rear directions in synchronization about the support shaft 9 extending in the left and right direction of the vehicle body 7. , 5 to support the left and right sides of the container 3, and by forward rotation of the lift arm 5 by the operation of the hydraulic cylinder 8, the container 3 on the ground at the rear of the vehicle body is loaded onto the vehicle body, and by backward rotation of the lift arm 5, the container 3 is loaded onto the vehicle body. A certain container 3 can be unloaded onto the ground at the rear.

Flanges 16b are integrated into both ends of the connecting shaft 16 shown in FIG. In order to tilt the container 3, a dump pin 17 that moves back and forth in the left-right direction is provided so as to engage with a dump pin hole, which will be described later.

A ball 18a formed at the tip of the piston rod of the locking cylinder 18 is inserted into the back of the dump pin 17. In this way, the dump pin 17 is connected to the locking cylinder 18 whose rear end is supported by the support member 19, while the tip 17a of the dump pin 17 is connected to the connecting shaft 16.
It is inserted into and held by a support body 20 provided near the center of the upper vehicle body, so that it can be smoothly moved forward and backward in the left and right directions.

This support body 20 includes a cylindrical body 20a and a bracket 20.
It is integrated into the connecting shaft 16 between the lift arms 5, 5 via the bracket 20b. Dump pin 1 in the retracted state shown by the solid line
An engagement frame 22 having a dump pin hole 21 shown by a phantom line attached to the bottom of the container 3 being loaded is disposed close to the inner side of the tip 17a of the container 3.

In this example, the receiving member 23 facing the support body 20 is provided at a position inward of the support body 20 and sandwiching the engagement frame 22, so that when the container 3 is tilted, the dump pin 17 in the forward state is Cylindrical body 20a
and the support hole 23a of the receiving member 23.

When the container 3 and the lift arms 5, 5 are integrated via the dump pin 17 and the engagement frame 22 held in this manner, the container 3 is moved as shown in FIG. 4 by the extension of the hydraulic cylinder 8. can be dumped and discharged. Incidentally, when the lift arm 5 is rotated forward and the container 3 is mounted on the vehicle body 7, as shown in FIG. , is attached so as to be inclined backward at a certain angle with respect to the horizontal line H, so as not to interfere with the bottom of the container 3. Note that when the lift arm 5 rotates back and forth, the dump pin 17 rotates about the support shaft 9 in the direction of arrow 24.

On the other hand, as shown in FIG. 6, the bottom surface 3b of the container 3 consists of an upwardly sloping rear bottom portion 3R and a horizontal front bottom portion 3F. As shown in FIG. 7, a pair of left and right vehicle support legs 25 extend back and forth.
A, 25A, and a total of four grounding support legs 25B, 25B are provided in front and rear of the outside thereof. Then, the reinforcing material 3 at the rear bottom 3R of the container 3
A pair of engagement frames 22 are attached by welding or the like to the inner surface of the rear vertical member 25a where A1 and 3A2 are located.
22 is fixed thereto, and an oval dump pin hole 21 (see FIG. 6) is bored therein.

The tip portion 17a of each dump pin 17, which has moved forward as the locking cylinder 18 shown in FIG. 1 expands, is inserted into the dump pin hole 21. Therefore, when the lift arm 5 rotates backward, the dump pin 17 is rotated about the support shaft 9 in the direction of arrow 24 (see FIG. 5), and is restrained by the dump pin 17 and the support portion 6 of the lift arm 5. The container 3 is also rotated backwards and tilted from a horizontal position.

In addition, since the support part 6 has a structure that allows slight displacement of the support shaft 4, the dump pin hole 21 is formed into an oval shape in order to follow the tilted posture of the container 3 as the support part 6 moves. By the way, the second
Outriggers 26 with built-in hydraulic jacks (not shown) are provided on the rear left and right sides of the vehicle body 7 shown in the figure.
The weight of the container 3 being loaded and unloaded by the cargo handling device 2 prevents the vehicle body 7 from taking the head-up position.

On the other hand, as shown in FIG. 8, the lower frame of the vehicle body 7 is formed by a rectangular vehicle frame 33.
It is reinforced with three sub-frames 33A, 33B, and 33C extending left and right on the same level. Note that two vertical frames 33M and 33N extending in the front and back are mounted on the front frame member 33a of the vehicle frame 33 and the three sub-frames, and the vehicle support legs 25A and 25A (see FIG. 7) of the container 3 are mounted on the front frame member 33a of the vehicle frame 33 and the three sub-frames. It is attached for purposes such as being placed on a table. Among such frame structures, the left and right side frame members 33b of the vehicle frame 33
At the top of the car body 7, from the front to the rear of the car body 7,
Support frame 3 having outer plate material 34A and inner plate material 34B
4 is attached without protruding to the side of the vehicle frame 33.

The support frame 34 extends downward at the rear of the vehicle body 7. In this example, a U-shaped member is employed as the support frame 34 and is mounted on the side frame member 33b, and the above-mentioned hydraulic cylinder 8 (see FIG. 2) is mounted inside the U-shaped member. There is.
Note that the above-mentioned outer plate material 34A and inner plate material 34B extending in the front-rear direction are located inside and outside of each lift arm 5, as shown in FIG. 9, which will be described below.

Referring to FIG. 9, which is an enlarged view of the left side of FIG. 5 as viewed from the - line arrow, the structure of the base end portion of the lift arm 5 will be described below. A holding member 35 is fixed to the lower rear end of the lift arm 5. This includes a small-diameter hole 35b that extends in the left-right direction of the vehicle body 7 and into which the support shaft 9, which is the center of rotation of the lift arm 5, can be inserted, and a small-diameter hole 35b that extends in the left-right direction of the vehicle body 7 and opens toward the inside of the vehicle body 7. A stepped space having a large diameter hole 35a is provided. That is, the opening of the large diameter hole faces inward, and the opening of the small diameter hole faces outward. It goes without saying that the lift arm 5 on the right side is arranged symmetrically with the lift arm 5 on the left side.

A flange portion 35c is provided on the small diameter hole 35b side of this holding member 35, and when the holding member 35 is attached to the lower rear end of the lift arm 5 and fixed by welding or the like, the flange portion 35c is lifted. It is positioned in contact with the outer surface of the arm 5. When the support shaft 9 is inserted into the space formed by the large diameter hole 35a and the small diameter hole 35b, an annular space is formed, into which the two coupling members 36, 36 are inserted. ing.

As will be described later, this coupling member 36 can expand and contract in the radial direction of the support shaft 9 inserted therethrough, and firmly integrates the lift arm 5 and the support shaft 9 via the holding member 35.

The outer plate material 34A of the support frame 34 described above has an outer support ring 3 that supports the support shaft 9 on the outside of the lift arm 5.
7 is attached, and the end of the support shaft 9 is supported by a bearing metal 34m inserted into the outer support ring 37. The inner plate material 34B of the support frame 34 includes a small support tube 39A.
An inner support ring 38 consisting of a large support tube 39B is attached,
The small support cylinder 39A has a bearing metal 39 inserted therein.
The support shaft 9 is supported inside the lift arm 5 at m.
Therefore, the lift arm 5, on which a large load acts, is supported on both sides at its left and right parts,
The lift arm 5 is designed not to be cantilevered on the support shaft 9. Note that an outrigger 26, which is not shown in FIG. 5, is attached to the rear lower end of the support frame 34, as shown in FIG.

In this example, the main support tube 39B is the inner plate material 34B.
When it is attached to and integrated with the inner plate member 34B, the flange portion 39b formed on the main support tube 39B is brought into contact with the inner surface of the inner plate member 34B for positioning. When the support shaft 9 is inserted into the holding member 35 through the insertion hole 39d of the large support tube 39, an annular space for fixing the coupling member 36 is formed within the holding member 35. Small support tube 39A to cover the entrance of the space
is adapted to be fitted inside the main support tube 39B.
At the time of fitting, the flange portion 39a of the small support tube 39A is brought into contact with the large support tube 39B and positioned, and then the two are integrated with the bolt 39c. The inner side portion of the end of the support shaft 9 is supported by the small support cylinder 39A.

The outer diameter of the small support tube 39A and the inner diameter of the large support tube 39B are selected so as to facilitate the diameter adjustment work of the coupling member 36 in the space and to facilitate the assembly of the small support tube 39A.

The above-described coupling member 36 includes an annular inner ring member 47 surrounding the support shaft 9 as shown in FIG.
It has an annular outer ring material 48 located on the hole side of the large diameter hole 35a, and a tapered surface M formed in a conical shape,
The inner ring material 47 and the outer ring material 48 are connected through the tapered surface M.
It consists of a wedge member 49, that is, a conical member 49A, 49B, which is in contact with and is slidable on the tapered surface M, and a bolt 50. At the center of the conical member 49B,
A threaded portion into which the bolt 50 is screwed is formed, and an insertion hole for the bolt 50 is formed in the conical member 49A. Therefore, when a tightening rotary tool is inserted into the hexagonal hole 50a formed in the head of the bolt 50 and screwed in, the conical member 49A moves in the direction of arrow 40, and the conical member 49B moves in the direction of arrow 41.

A slit (not shown) is cut into the inner ring member 47 and the outer ring member 48 in the direction in which the bolt 50 is inserted, so that the inner ring member 47 and the outer ring member 48 can expand and contract in the circumferential direction. As a result, by threading the bolt 50, the conical member 49
A, 49 approach each other, the diameter of the inner ring material 47 is reduced inward through the tapered surface M and the support shaft 9 is pressed, and the diameter of the outer ring material 48 is expanded and the hole surface of the large diameter hole 35a is pressed. I'm starting to be able to do it.

In this way, the large diameter hole 21 in the holding member 35
a and the inserted support shaft 9, by displacing the wedge member 49 in the left-right direction, members 47 and 48 whose diameters change via the tapered surface M are also connected via the holding member 35. The lift arm 5 and the support shaft 9 can be firmly integrated.

The container tilting lock mechanism configured as described above can tilt the container 3 in the following manner.

When the cargo handling vehicle 1 shown in FIG. 2 is in a stopped state with the container 3 on board, the outrigger 26 is grounded. In order to discharge the contents from the container 3 on which the vehicle body 7 is mounted, the locking cylinder 1 shown in FIG.
8 stretches. For the pair of dump pins 17 connected to the tips of the piston rods, the tip portions 17a held by the support body 20 move forward toward the receiving member 23, and the dump pin holes 22 of the engagement frame 22 of the container 3 move forward. and is inserted into the receiving member 23. In this way, the container 3 is connected to the connecting shaft 16 and the lift arms 5, 5 via the engagement frame 22, which is located inside the lift arms 5, 5 and has the dump pin 17 inserted into each dump pin hole 21. be integrated.

Next, when the hydraulic cylinder 8 is extended, both lift arms 5 and both dump pins 17 rotate around the support shaft 9. When the container assumes the tilted position as shown in FIG. 4, the stored items are ejected in a sliding manner. At this time, the triangle formed by the support shaft 9 of the lift arm 5G, the support shaft 4 of the container 3, and the dump pin 17 does not deform in principle while the container 3 is being dumped. This is because the dump pin is fixed to the connecting shaft 16 and therefore always moves as the lift arm 5 rotates. Therefore, the container 3 is dumped based on the three positions in which the relative positions are always maintained, and no wobbling occurs due to fluctuations in the center of gravity of the container 3 during dumping. When the hydraulic cylinder 8 is contracted after being discharged, the container 3 is returned to a horizontal position and placed on the vehicle body 7. Then, when the locking cylinder 18 is retracted as required, the container 3 is released from the lift arm 5.

On the other hand, when the container 3 is unloaded to the rear of the vehicle body 7, when the hydraulic cylinder 8 is extended while the locking cylinder 18 is contracted, the container 3 is unloaded onto the ground by the backward rotation of the lift arm 5. In addition,
When the front arm 27, which is formed in a dogleg shape and rotates in the front-rear direction about a support shaft 28 shown in FIG. be able to.

That is, at the upper tip of the Floton arm 27,
A hook 30 that opens and closes as it expands and contracts is attached to the hydraulic cylinder 29, and the hook 30 holds a clamping shaft 31 fixed at the center of the upper front end of the container 3. Support shaft 4 of container 3
The imaginary side connecting the support shaft 4 and the clamping shaft 31 and the imaginary side connecting the support shaft 28 of the front arm 27 and the support shaft 9 of the lift arm 5 are parallel and have the same length, and the support shaft 4 and the clamping shaft 31 This is because the support shaft 28 and the support shaft 9 are arranged so as to form a parallelogram.

The container 3 unloaded in this manner while maintaining a horizontal position is released from the hook 30 by the contraction operation of the cylinder 29. When loading a new container 3 onto the vehicle body 7, the hook 30 is fitted onto the clamping shaft 31 and secured, and the hydraulic cylinder 8 is contracted.
Since the lift arm 5 and the front arm 18 rotate forward, the container 3 can be loaded while maintaining a horizontal position. Note that the container tilting lock mechanism of the present invention can also be applied to a cargo handling device such as that shown in FIG. 11, in which the front arm 27 is not attached.

In the above explanation, the container tilting lock mechanism according to the present invention is not located on the outside of the lift arm as shown in FIG. There isn't. Therefore, the lift arm can be positioned to the side across the full width of the vehicle, ensuring a wide loading platform, increasing the space for loading containers, and making it possible to load large containers.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the main part of a container tilting lock mechanism of the present invention, FIG.
Figure 4 is an explanatory diagram of the tilting posture of the container, Figure 5 is an explanatory diagram showing the installation position of the dump pin, Figure 6 is a front view of the container, and Figure 7 is the diagram shown in Figure 6. Fig. 8 is a plan view of the loading platform, and Fig. 9 shows the structure as seen from the - line in Fig. 5, showing the mounting state of the rear lower end of the lift arm and the support shaft supporting the tilting center. 10 is a sectional view of a holding member interposed with a coupling member that fixes the lift arm to the support shaft, FIG. 11 is a front view of a cargo handling vehicle equipped with a conventional dump pin and a side wall hole of the lift arm, and FIG.
FIG. 2 is an explanatory diagram of the mechanism for inserting and removing the dump pin. 1...Cargo handling vehicle, 2...Cargo handling device, 3...Container, 3R...Rear bottom, 5...Lift arm,
7... Vehicle body, 8... Hydraulic cylinder, 9... Support shaft,
16... Connection shaft, 16a... End, 17...
...Dump pin, 18...Lock cylinder, 20
... Support body, 21 ... Dump pin hole.

Claims (1)

[Scope of Claims] 1. The left and right sides of the container are supported by a pair of lift arms provided on the left and right sides of the vehicle body, which are rotatable in the front and rear directions in synchrony around a support shaft extending in the left and right direction of the vehicle body, and the container is supported by a hydraulic cylinder. In cargo handling vehicles, containers on the ground at the rear of the vehicle can be loaded onto the vehicle by forward rotation of the lift arm, and containers on the vehicle can be unloaded onto the ground at the rear by rotation of the lift arm backwards. In the cargo handling equipment, a connecting shaft for synchronizing the forward and backward rotation of the lift arms is attached to the rear ends of both the lift arms, and a connecting shaft for tilting the container is attached to both ends of the connecting shaft located between the two lift arms. Therefore, the dump pin moves back and forth in the left and right direction so as to engage with the dump pin hole provided at the rear bottom of the container.
A locking cylinder that is provided inside the pair of left and right lift arms and moves the dump pin forward and backward, and a support body that guides the dump pin back and forth.
A container tilting lock mechanism in a cargo handling device for a cargo handling vehicle, characterized in that the lock mechanism is mounted on a connecting shaft located between both lift arms.