JPH054257B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a container hook mechanism in a front arm of a cargo handling device for a cargo handling vehicle.
The present invention relates to a hook mechanism for a front arm in a cargo handling device that is detachably supported by a lift arm and is capable of loading and unloading a container whose front end upper part is held by the front arm onto a vehicle body.

[Conventional technology]

Cargo handling vehicle 1 for transporting container 3 shown in FIG.
A cargo handling device 2 for loading and unloading containers 3 onto and from the vehicle body is attached to the vehicle. In order to handle the container 3 with the cargo handling device 2, it is necessary to support the container 3, and support shafts 4 are protruded from the left and right sides of the container 3. In order to receive the support shaft 4, the cargo handling device 2 is provided with a lift arm 5 on which a support portion 6 is formed, and is attached to the vehicle body 7 via a hydraulic cylinder 8 and a support shaft 9 so as to be rotatable forward and backward.

In the case of the cargo handling device 2 having this type of lift arm, the container 3 is able to support the lift arms 5, 5 via a pair of left and right support shafts 4, 4, and the mounting position of the support shafts 4 is determined. is container 3
Container 3 is placed above the center of gravity of container 3 during cargo handling operations.
Care has been taken to ensure that the posture of the person does not become unstable.

Further, in order to maintain the attitude of the container 3 horizontally during loading and unloading, a front arm 12 is formed in a dogleg shape and rotates in the front and rear directions around a support shaft 11.
is provided at the front center of the vehicle body 7. A hook 14 that opens and closes in accordance with the expansion and contraction of the hydraulic cylinder 13 is attached to the top end of the container 3, and the hook 14 holds a clamping shaft 15 fixed at the center of the upper front end of the container 3.

Note that the imaginary side connecting the support shaft 4 of the container 3 and the clamping shaft 15 and the support shaft 11 of the front arm 12
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 1
5. A parallelogram is formed with the support shafts 11 and 9 as vertices. Then, by the extension of the hydraulic cylinder 8, the container 3 is unloaded onto the ground behind the vehicle body 7 while maintaining a horizontal attitude, and is loaded onto a loading platform by being reduced.

[Problem to be solved by the invention]

By the way, as shown in FIG.
is a fixed hook 14A, a swinging hook 14B,
Hydraulic cylinder 13 that rotates the swinging hook 14B and support shaft 1 that is the center of rotation of the swinging hook 14B.
It consists of 4C. And the hydraulic cylinder 13 is
Its rear part is held by the mounting bracket 14D, and the front part 12a of the front arm 12 (see FIG. 8)
is attached to.

When the container 3 is supported and moved by the cargo handling device 2, the entire weight of the container 3 acts on the lift arm 5 and the front arm 12 from the support shaft 4 and the clamping shaft 15. When the front arm 12 is rotated backward, the hook 14 supported by the clamping shaft 15 changes its attitude as shown in FIG. 9, for example. When the swinging hook 14B is in the downward position shown in the figure, a load acts directly on the swinging hook 14B.

That is, a moment is generated around the support shaft 14C, and the swinging hook 14B receives a force that causes it to rotate in the direction of arrow M. Therefore, a large force in the direction of arrow N is applied to the hydraulic cylinder 13, and the hydraulic cylinder 13 is required to have a large hydraulic pressure capable of resisting the force. In addition, a huge force is transmitted to the front arm 12 via the mounting bracket 14D, so it is necessary to increase the strength and rigidity of the front arm 12 including the attached parts, and the hook 14 and hydraulic cylinder 13 are also large. turned into
There is a problem of high production costs.

By the way, Japanese Utility Model Application No. 61-82834 discloses the above-mentioned swinging hook 14 for closing the opening of the hook.
Instead of rotating B, an engagement safety device is described in which a rod that moves back and forth in the direction in which the arm extends closes a hook attached to the tip of the arm and can hold the clamping shaft. There is. The hook of this example has a structure in which, in principle, the load of the container transmitted from the clamping shaft to the hook does not act on the rod. In other words, even when the arm is in a backward rotation state, the main body of the hook remains below the rod even while the arm is in a forward rotation state.

The fact that no large load is applied to the rod has the advantage that the strength of the rod does not have to be particularly high. However, when grasping the gripping shaft of a container on the ground, the backward rotation angle of the arm that should lower the hook below the gripping shaft must be adjusted to a large degree, and the vehicle must be moved backwards a little so that the hook is located directly below the gripping shaft. After doing this, you must rotate the arm forward. If the hook is open at the bottom as shown in Figure 9, the cargo handling work will be much more troublesome compared to the case where the container can be grabbed by simply positioning the vehicle so that the hook is located directly below the container's clamping shaft. There are some difficulties. Not only this, but the amount of rotation of the arm increases, and the stroke of the cylinder also has to be lengthened, necessitating an increase in the size of the load and handling equipment.

In addition, both the case of FIG. 9 and the case of Japanese Utility Model Application Laid-open No. 61-82834 are as follows. To explain this with reference to FIG. 9, a hydraulic cylinder 13 and a mounting bracket 14D are located on the front portion 12a. Therefore, it is necessary to ensure a space such that the hydraulic cylinder 13 and the like do not come into contact with the cabin 7A (see FIG. 8) when the arm 12 rotates forward. As a result, the loading space for the container 3 on the vehicle body 7 becomes narrower, forcing the capacity of the container 3 to be reduced, or the vehicle must be made larger in order to carry the desired capacity of the container. An unavoidable problem has arisen.

The present invention has been made to solve the above-mentioned problems, and its purpose is to eliminate the moment that occurs when a container is moved to be loaded or unloaded from a vehicle body, while also eliminating the moment that occurs when the container tries to push open the hook. The force acting on the hydraulic cylinder for opening and closing the front arm is reduced, making it more compact and lightweight, and the amount of rotation of the front arm can be reduced as much as possible. It is an object of the present invention to provide a container hook mechanism in a front arm of a cargo handling device for a cargo handling vehicle, which can suppress the increase in size and further secure a wide loading space for a container on a loading platform.

[Means to solve the problem]

The present invention supports the left and right sides of a container by a pair of lift arms provided on the left and right sides of the vehicle body, which are rotatable in the front-rear direction about a support shaft extending in the left-right direction of the vehicle body, and the lift arms are moved by the operation of 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 by rolling forward onto the vehicle, and unload containers on the ground at the rear by rotating the lift arm backwards. .

The feature is that, with reference to FIGS. 1 and 2, in order to maintain the posture of the container 3 during loading and unloading, the front end upper part 3a of the container 3 is always opened rearwardly or downwardly. A front arm 18 is provided with a C-shaped hook 19 on its upper part and rotated by a hydraulic cylinder 10 attached to the vehicle body 7. A lock shaft 20 that moves forward and backward to open and close the hook 19 is attached to the rear surface 18b of the front arm 18, and a support hole 23 through which the lock shaft 20 is inserted is formed in the tip 19a and base 19b of the hook 19. A cylinder 21 for moving the lockshaft 20 forward and backward is attached to the inside of the front arm 18 or to the side surface 18g.

[Effect]

The container 3 loaded onto the vehicle body is supported by a pair of lift arms 5, 5, while the front end upper part 3a of the container 3 is moved from the upper part of the front arm 18 in order to maintain the attitude of the container 3 during loading and unloading. It is held by a hook 19 provided at.
At this time, as the cylinder 21 expands, the lock shaft 20 is inserted into the support holes 23 of the tip 19a and the base 19b. Even if the attitude of the hook 19 changes due to the rotation of the front arm 18, no force is applied to the lock shaft 20 to push the hook 19 open, and a large force is applied via the lock shaft 20 to the cylinder 21 that moves it forward and backward. There's nothing to do. Further, the lock shaft 20 is attached to the rear surface portion 18b of the front arm 18, so that the distance between the front arm 18 and the cabin can be reduced.

The container 3 is lowered onto the ground while maintaining a horizontal attitude, and when the cylinder 21 is contracted, the hook 19 is released and the container 3 is easily removed. When loading the container 3, the front end upper part 3a of the container 3 is held by the reverse operation, and at that time, the hook 19
It is no longer necessary to lower and hold the position excessively. Further, the lift arm 5 and the front arm 18 are rotated forward by the contraction of the hydraulic cylinder 8.

〔Effect of the invention〕

According to the present invention, when the container is moved for loading and unloading from the vehicle body, no load is generated that would force the hooks open. As a result, the force acting on the cylinder that advances and retreats the lockshaft is also reduced.
The hook and cylinder are smaller, and the front arm is smaller and lighter. Furthermore, the front and rear width of the front arm can be made thinner, and since there is no protrusion on the front part of the front arm (i.e., no lockshaft or cylinder for advancing and retracting it), the mounting position of the front arm can be moved to the front of the vehicle body 7. This makes it possible to secure a wide container storage space on the vehicle body and increase the capacity of the container. There is an advantage that the amount of rotation of the front arm does not increase, and the stroke of the hydraulic cylinder for rotating the front arm back and forth does not have to be increased.

〔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 for supporting and loading/unloading are attached, and are supported so as to be rotatable forward and backward about a support shaft 9 fixed to the vehicle body 7.

A recessed support portion 6 is formed on the tip end side of the main body of the lift arm 5, and an edge portion is provided in the front and rear direction. They are adapted to engage and support the container 3. The support shaft 4 is attached above the center of gravity of the container 3, and is mounted on the support part 6 during cargo handling operations.

Note that when the lift arm 5 rotates back and forth, the support shaft 4 rotates and slides on the support portion 6, or rolls in response to the back and forth rotation, and the container 3 is loaded and unloaded. On the other hand, a connecting shaft 28 is attached to the rear lower ends of the left and right lift arms 5, 5, and the two are integrated to synchronize rotation and increase rigidity. And, these lift arms 5, 5 are
It is designed to be rotated forward and backward by the expansion and contraction movement of a hydraulic cylinder 8 that is swingably attached to the vehicle body 7. By the way, outriggers 29 with built-in hydraulic jacks (not shown) are provided on the rear left and right sides of the vehicle body 7.
The weight of the container 3 being loaded and unloaded by the cargo handling device 2 prevents the vehicle body 7 from taking a head-up position.

As described above, in the cargo handling vehicle to which the present invention is applied, the lift arms 5, 5 are provided on the left and right sides of the vehicle body and are rotatable in the front and back directions about the support shaft 9 that extends in the left and right direction of the vehicle body 7. The container 3, which is on the ground at the rear of the vehicle body, is loaded onto the vehicle body by supporting the left and right sides of the container whose top surface is open, and the container 3 on the ground at the rear of the vehicle body is loaded onto the vehicle body by forward rotation of the lift arm 5 by the operation of the hydraulic cylinder 8, and by the backward rotation of the lift arm 5. It is now possible to unload container 3 located at the rear to the ground.

On the other hand, in order to maintain the attitude of the container 3 horizontally during loading and unloading, a front arm 18 that rotates back and forth around the center of the support shaft 11 is provided at the center of the front part of the vehicle body 7, and as shown in FIG. A hook 19 is attached to the upper end 18a. This hook 19
The lock shaft 20 is composed of a hook body 19A, a lock shaft 20 that moves forward and backward to open and close the hook 19, and a cylinder 21 that operates the lock shaft 20. A hydraulic cylinder 10 (see Figure 2) is provided for the front arm 18 via a pin shaft 17, but it is not for loading and unloading the container 3, but for independently rotating the front arm 18 forward and backward. It is.

The front arm 18 includes a main portion 18A and a base portion 18.
B, is attached to the vehicle body 7 via the pivot 11 which is the center of rotation, and is attached to the front end upper part 3 of the container 3.
It is designed to hold the clamping shaft 15 located at a. Note that since the support shaft 11 is located below the container 3, the rotation of the front arm 18 does not hinder the movement of the container 3. Further, the front arm 18 is bent into a dogleg shape so as not to interfere with the container 3.

The main portion 18A of the front arm 18 is shown in FIG.
As shown in FIG. 7, the main portion 18 has box-shaped members 18c and 18d with rectangular cross sections formed on the left and right sides.
The distance between the two box-shaped members 18c and 18d in the left-right direction is widened from slightly below the upper end 18a (see FIG. 1) of A to slightly above the base 18B. Therefore, both box-shaped members 18c and 18d
A space 18e shown in FIG. 3 is formed in the space 18e, which is designed to house the cylinder 21 therein.

Incidentally, the box-shaped member 18 forming the main portion 18A
The front and rear widths of c and 18d are shorter than those of the front arm 12 described in the prior art section due to a reduction in load due to the structure of the hook 19, which will be described later. Furthermore, the lock shaft 20 is attached to the rear surface 18b of the front arm 18 as shown in FIG.
Since there is nothing protruding from the front part 18f of the front arm 18, the front arm 1
8 can be provided close to the cabin 7A (see FIG. 8). As a result, the loading space for the container 3 on the vehicle body 7 can be increased, and the vehicle body 7 can be made smaller.

Hook body 19 constituting the above-mentioned hook 19
A consists of two left and right side plates 19B, 19B shown in FIG. 4, which are formed in a substantially C-shape that always opens rearward or downward and have a support space 22, and a connecting member 19C that connects them. . The connecting member 19C is connected to the open end 19a of the side plate 19B.
Support holes 23, 23 through which the lock shaft 20 is inserted are formed in the base portion 19b. A support member 24 is provided on the rear surface portion 18b of the main portion 18A, and a support hole 25 through which the lock shaft 20 is inserted and supported is formed.

Further, a coupling member 26 is attached to the center of the lockshaft 20, and one end of the coupling member 26 is connected to the cylinder 2.
The lock shaft 20 moves forward and backward as the cylinder 21 expands and contracts, opening and closing the hook 19.

The cylinder 21 is the main part 18 of the front arm 18.
A space 18 formed by the above-mentioned box-shaped members 18c and 18d is attached via the mounting bracket 27 of A.
It is within e. Note that the cylinder 21 is the main part 18
It may be attached to the side surface 18g of A (see FIG. 7). The point is that the mounting position of the cylinder 21 allows the front arm 18 to be positioned as far forward of the vehicle body 7 as possible, and that a large space for accommodating the container 3 can be ensured. By the way, as shown in Fig. 2, the support shaft 4 and the clamping shaft 1
5. A parallelogram is formed by connecting the support shaft 11 and the support shaft 9, and the container 3 is loaded and unloaded while maintaining a horizontal attitude.

The container hook mechanism configured as described above supports the front end upper part 3a of the container 3 in the following manner, and facilitates loading/unloading and transportation of the container 3.

When the cargo handling vehicle 1 shown in FIG. 2 is in a stopped state with the container 3 on board, the outriggers 29 are grounded. Front arm 1 to unload container 3
When the hydraulic cylinder 8 of the lift arm 5 is extended with the hydraulic cylinder 10 of 8 in a free state, the lift arm 5 moves in the direction of arrow 30 around the support shaft 9 via the pin shaft 16, and the front arm 18 moves toward the support shaft. 11
Rotate in the direction of arrow 31 around . Most of the load of the container 3 is supported by the support part 6 of the lift arm 5, and the gripping shaft 15 is held by the hook 19 of the front arm 18, so that the container 3 is lowered to the ground while maintaining a horizontal attitude.

In the support space 22 of the hook body 19A located at the upper end 18a of the front arm 18, the hook 19, which holds the clamping shaft 15 by extension of the cylinder 21, changes its posture as the front arm 18 rotates backward. For example, the attitude of the hook 19 is as shown in FIG. 9 which shows the prior art, even if the lockshaft 21 is under the hook body 19A, no force is applied to retract the lockshaft 21 in the direction in which the cylinder 21 is contracted. 21 is only bent. Therefore, the clamping shaft 15 does not exert a large force on the cylinder 21 via the lock shaft 21.

The container 3 unloaded in this manner while maintaining a horizontal position is released from the hook 19 by the contraction operation of the cylinder 21. When loading a new container 3 onto the vehicle body 7, a hook 19 is attached to the clamping shaft 15.
, extend the lock shaft 21 and insert its tip into the support hole 23 , and insert the hydraulic cylinder 8 into the support hole 23 .
When the container 3 is reduced, the lift arm 5 and the front arm 18 are rotated forward, and the container 3 can be loaded.

In such a cargo handling operation, when grasping the clamping shaft 15 of the container 3 on the ground, it is only necessary to place the hook 19 above the clamping shaft 15 and lower it. In the conventional technology, such as the one disclosed in Japanese Utility Model Application Publication No. 61-82834, the hook must be lowered in advance from the gripping shaft, and then the vehicle must be moved backwards, the hook placed directly under the gripping shaft, and then rotated forward. However, in the structure of this example, there is no such need. Conversely, the same applies when removing the clamping shaft from the front arm. Therefore, the rotation angle of the front arm 18 is not increased, and the stroke of the hydraulic cylinder 10 is not increased.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of main parts of a front arm including a container hook mechanism of the present invention, FIG. 2 is an explanatory diagram of the configuration of a cargo handling device in a cargo handling vehicle to which the present invention is applied, and FIG. 3 is a line drawn along the line shown in FIG. 1. 4 is a sectional view taken along the - line in FIG. 1, FIG. 5 is a sectional view taken along the - line in FIG. 7 is a sectional view taken along the line -- in FIG. 1, FIG. 8 is an overall view of a cargo handling vehicle equipped with a conventional hook, and FIG. 9 is a diagram showing a backward rotation state of the conventional hook. 1...Cargo handling vehicle, 2...Cargo handling device, 3...Container, 3a...Front end upper part, 5...Lift arm,
7... Vehicle body, 8, 10... Hydraulic cylinder, 9...
Support shaft, 18... Front arm, 18b... Rear part, 18g... Side, 19... Hook, 19a...
...Tip, 19b...Base, 20...Lockshaft, 21...Cylinder, 23...Support hole.

Claims (1)

[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 around a support shaft extending in the left and right direction of the vehicle body, and In a cargo handling device for a cargo handling vehicle, in which a container on the ground at the rear of the vehicle can be loaded onto the vehicle by rotating the lift arm forward, and a container on the vehicle can be unloaded onto the ground at the rear by rotating the lift arm backwards. In order to maintain the attitude of the container during loading and unloading, it is equipped with a roughly C-shaped hook on the top that holds the top of the front end of the container and always opens backwards or downwards, and is rotated by a hydraulic cylinder attached to the vehicle body. A front arm is provided, and a lock shaft that moves forward and backward to open and close the hook is attached to the rear surface of the front arm, and a support hole through which the lock shaft is inserted is formed at the tip and base of the hook. The cylinder that moves forward and backward is
A container hook mechanism in a front arm of a cargo handling device for a cargo handling vehicle, characterized in that the container hook mechanism is attached to the inside or side of the front arm.