JPH0418572B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a cargo handling vehicle, and more particularly, the present invention relates to a cargo handling vehicle, and more specifically, a container that is detachably supported by a lift arm and maintains its posture when being loaded onto or unloaded from a vehicle body. The present invention relates to a cargo handling vehicle equipped with a front arm that can

[Prior art]

A cargo handling vehicle 1 that transports a container 3 shown in FIG.
Some vehicles are equipped with a cargo handling device 2 for loading and unloading containers 3 onto and from the vehicle body. To unload container 3 with device 2, container 3
It is necessary to support the container 3, and support shafts 4 are protruded from the left and right sides of the container 3. The cargo handling device 2 for receiving the support shaft 4 is provided with a pair of left and right lift arms 5 each having a support portion 6 formed thereon, and is rotatable forward and backward via a lift cylinder 8 and a support shaft 9 on the vehicle body 7. can be attached to. A rotatable front arm 10 for maintaining the attitude of the container 3 during forward and backward rotation is provided at the front central position of the vehicle body 7. It is formed in a dogleg shape, and a hook 11 that can be opened and closed is attached to the upper end of the swinging part 10B, and the hook 11 supports and releases the holding shaft 12 on the upper front end 3a of the container 3. . Since the above-mentioned FIG. 1 includes the configuration of the present invention, the technology prior to the present invention will be explained below with reference to FIG. 5 and subsequent figures.

The front arm 10 is attached to the vehicle body 7 at the lower end of the base 10A shown in FIG. 5 via a support shaft 13 that is the center of rotation of the front arm 10. The tip 15a of the piston rod of the auxiliary cylinder 15 is connected to a bracket 14 attached to the lower surface 10a of the front arm 10 (see FIG. 6), and the other end is swingably fixed to the vehicle body 7. The front arm 10 rotates due to expansion and contraction. Therefore, when loading and unloading the container 3 shown in FIG.
rotates together with the lift arm 5 to keep the container 3 in a substantially horizontal position. That is, in the case of this cargo handling device 2, since the front arm 10 and the like form a parallelogram link as described later, it is possible to maintain the posture.

[Problem that the invention seeks to solve]

In the cargo handling device 2 as described above, the front arm 10 can maintain the attitude of the container 3, allowing smooth loading and unloading onto the vehicle body 7. By the way, the height (H+h) to the top surface of the container 3 mounted on the vehicle body 7 shown in FIG. 1 is regulated by vehicle regulations, and is suppressed to a predetermined height or less. On the other hand, in the case of the vehicle body 7, the lower surface 7
Since the height h of b is restricted by various design conditions of the cargo handling vehicle, the height h cannot be made very low. Fifth
The auxiliary cylinder 15 with a long stroke in the conventional cargo handling device 2 shown in the figure is attached to the bracket 1 located on the lower surface 10a of the base 10A of the front arm 10.
It is installed diagonally downward from 4, and generally, its installation posture is often fixed. Due to its attachment, a space is required extending diagonally downward from the center of the vehicle body 7, and the height H1 from the lower surface 7b to the upper surface 7a of the vehicle body 7 increases. the result,
The height of the top surface 7a of the vehicle body 7 from the road surface is H1+h
As a result, the top surface 7a is raised and the height of the container placed on the top surface 7a is limited, which causes a problem in that the height of the container is kept low and its capacity is reduced. In addition, due to the raised top surface 7a of the vehicle body 7, the center of gravity of the vehicle shifts upward, causing problems such as unstable running and difficulty in turning.

The present invention has been made to solve the above-mentioned problems, and its purpose is to reduce the height of the top surface of the vehicle body, facilitate smooth running and turning of the vehicle, and increase container capacity. The aim is to provide cargo handling vehicles.

[Means for solving problems]

The characteristics of the cargo handling vehicle of the present invention will be explained with reference to FIG. In a cargo handling vehicle in which the arm 5 is swung forward and backward to load and unload the container 3, the upper front end 3 of the container 3 is used to maintain the attitude of the container 3 during loading and unloading.
A front arm 18 is provided to support the container 3, and the front arm 18 is rotatably attached to the vehicle body 7 below the container 3, and is bent so as not to interfere with the container 3.
An auxiliary cylinder 15 for rotating the front arm 18 is attached to the base 18A of the front arm 18, and the base 18A has closed sections 21, 2 on the left and right.
2 (see Figure 3) is formed, and its both closed cross sections 2
Recessed part 2 for attaching the auxiliary cylinder 15 between 1 and 22
3 is formed.

[Effect]

When the container 3 is mounted on the vehicle body 7, the container 3 is supported by a pair of lift arms 5, and the front end upper part 3a of the container 3 is supported by a front arm 18. When unloading the container 3, both the lift cylinder 8 and the auxiliary cylinder 15 are extended, and the lift arm 5 and front arm 18 are rotated backwards, so that the container 3 is
be lifted and moved towards the rear of the During the movement, the front arm 18 rotates together with the lift arm 5, and the front end upper part 3a is supported by the front arm 18, so that the container 3
The posture is maintained. Since the auxiliary cylinder 15 is installed in the recessed part 23 between the closed sections 21 and 22 formed in the base 18A of the front arm 18, the upper surface 7a of the vehicle body 7 can be lowered. As a result, the capacity of the container 3 can be increased, and the stability of running and turning of the cargo handling vehicle 1 can be improved.

〔Effect of the invention〕

In order to maintain the attitude of the container during loading and unloading, the present invention is provided with a front arm that supports the upper part of the front end of the container, and the front arm is rotatably attached to the vehicle body below the container. The front arm is bent to prevent interference, and an auxiliary cylinder for rotating the front arm is attached to the base of the front arm.The base has closed sections on the left and right sides, and a recess is formed between the closed sections. Therefore, it is possible to install an auxiliary cylinder for rotating the front arm inside the base of the front arm. Therefore, the installation space for the auxiliary cylinder is small, and the front arm can be supported at a low position. Therefore, the center of gravity of the vehicle is lowered, and the height of the container can be increased accordingly to increase the capacity. Furthermore, stability during driving and turning can be increased.

〔Example〕

Hereinafter, the present invention will be explained in detail based on examples thereof. FIG. 1 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 onto a vehicle body 7. A pair of left and right lift arms 5 (one shown in the figure) are attached to the vehicle body 7 to support and unload the container 3, and are supported so as to be rotatable forward and backward about a support shaft 9 fixed to the vehicle body 7. be done.

The distal end side of the main body of the lift arm 5 is bifurcated, and the base of the lift arm 5 forms a support portion 6 that engages with a support shaft 4 extending to the left and right of the container 3 to 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 operation. It should be noted that when the lift arm 5 rotates back and forth, the support shaft 4 comes into sliding contact with the support portion 6 by rotating and sliding thereon. By the way, above the spindle 9,
A connecting shaft 16 for integrating the left and right lift arms 5, 5 and increasing rigidity is installed at a position that does not impede the movement of the container 3 being loaded and unloaded.

The lift arm 5 is configured to be rotated forward and backward by the expansion and contraction movement of a lift cylinder 8 that is swingably mounted on the vehicle body 7. The tip of each piston rod is attached to both the left and right lift arms 5 via a pin shaft 17, and when the piston rod extends, the lift arm 5 rotates backward, and the container 3 is lowered to the ground at a position behind the vehicle body 7 (not shown). .

On the other hand, a front arm 18 is provided at the front central position of the vehicle body 7 to maintain the attitude of the container 3 during loading and unloading. It consists of a base portion 18A and a swinging portion 18B, and a pivot 13 that is the center of rotation.
The holding shaft 12 is attached to the vehicle body 7 via the holding shaft 12 and supports the holding shaft 12 located at the upper front end 3a of the container 3. Note that since the support shaft 13 shown in FIG. 2 is located below the container, the rotation of the front arm 18 does not hinder the movement of the container 3. Moreover, the shape of the front arm 18 is
It is formed in a bent dogleg shape so as not to interfere with the container 3. Upper end part 1 of swinging part 18B
8a (see FIG. 4) is equipped with a hook 11 that can be opened and closed to support and release the holding shaft 12. The hook 11 is, as shown in FIG.
A fixed hook 11A, a swinging hook 11B, a hook cylinder 11C for rotating the swinging hook 11B, and a pin shaft 11 attached to the fixed hook 11A and serving as the center of rotation of the swinging hook 11B.
D and more. The fixed hook 11A is integrated with the front arm 18, and the fixed hook 11A is further formed with an opening that is closed when the swinging hook 11B comes into contact with the fixed hook 11A. A line connecting support shafts 9 and 13 of lift arm 5 and front arm 18 and a line connecting support shaft 4 and holding shaft 12 form two opposing sides of a parallelogram, and Since the line connecting the shaft 13 and the holding shaft 12 and the line connecting the support shaft 4 and the support shaft 9 form the other two sides of the parallelogram, the lift arm 5 and the front arm 18 rotate together. can do. Therefore, if the hook 11 supports the holding shaft 12, the desired horizontal posture of the container 3 can be easily maintained.

By the way, in the base portion 18A of the front arm 18 shown in FIG. 3, a pair of left and right closed cross sections 21 and 22 are formed to improve the strength, and the upper sides of both are integrated with the upper member 18b. Furthermore, a recessed portion 23 for mounting the auxiliary cylinder 15 is formed surrounded by the upper member 18b and the inner surfaces of both closed sections 21 and 22. In this example, sleeves 24, 24 passing through both closed sections 21, 22 are fixed at approximately the center of the concave portion 23, and both sleeves 24, 24 are fixed to each other.
A pin shaft 25 is provided which is inserted and fixed in the. The tip 15a of the piston rod of the auxiliary cylinder 15 is rotatably fitted into the center of the pin shaft 25. As a result, the mounting position of the front arm 18 of this example can be lowered compared to the mounting position of the conventional front arm 10 shown in FIG. Therefore, from the lower surface 7b of the vehicle body 7 to the upper surface 7a
The height H2 (see Figure 2) is the conventional height H1
(See FIG. 5).
Note that the cross section of the swinging portion 18B is formed into one closed cross section to increase strength, and is tapered upward, and the above-mentioned fixing hook 11A is attached to the upper end portion 18a. Further, in this example, a plate member 18c is attached to the front arm 18 at its bent position to enhance the integration of the base portion 18A and the swinging portion 18B. Incidentally, outriggers 26 with built-in hydraulic jacks (not shown) are provided on the rear left and right sides of the vehicle body 7 to prevent the vehicle body 7 from being in a head-up position due to the weight of loading and unloading the container 3 by the cargo handling device 2. It is becoming more and more like this.

The cargo handling vehicle 1 configured as described above can load and unload the container 3 onto the vehicle body 7 in the following manner.

In the case of the loading vehicle 1 shown in FIG. Front end upper part 3 in 3
A holding shaft 12 is supported by a hook 11 located at the upper end 18a of the front arm 18.
When the destination is reached, the outriggers 26 are extended to support the vehicle body 7, and the lift cylinder 8 and the auxiliary cylinder 15 are both extended. Container 3 is the support shaft 9,1
As the lift arm 5 and the front arm 18 rotate together about 3, the upper surface 7a of the vehicle body 7
It moves while being lifted up in the direction of arrow 27 while drawing a circular arc. At this time, since the holding shaft 12 is supported by the hook 11 of the front arm 18, the posture of the container 3 is maintained and moved, and the contents in the container 3 do not fall during the movement. When the container 3 is lowered to the rear position of the vehicle body 7, the hook cylinder 11C of the hook 11 is contracted, the swinging hook 11B is separated from the fixed hook 11A, and the holding shaft 12 is released from the opening thereof.
is released. Furthermore, when the container 3 is loaded onto the vehicle body 7, the hook cylinder 11C also extends.
The holding shaft 12 is supported by the hook 11, and as the lift arm 5 and the front arm 18 rotate in the direction of arrow 28, the container 3 is loaded onto the upper surface 7a of the vehicle body 7 while maintaining a horizontal attitude.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the configuration of a cargo handling device in a cargo handling vehicle to which the present invention is applied, Fig. 2 is an enlarged view of the base of a front arm in the cargo handling vehicle, and Fig. 3 is a cross-sectional view taken along the - line in Fig. 2; FIG. 4 is a front view of a cargo handling device having a front arm, FIG. 5 is an enlarged view of the base of the front arm in the prior art, and FIG. 6 is a sectional view taken along the - line in FIG. 5. 1... Cargo handling vehicle, 3... Container, 3a... Upper front end, 5... Lift arm, 7... Vehicle body, 8...
...Lift cylinder, 15...Auxiliary cylinder, 18
...Front arm, 18B...Base, 21,2
2...Closed section, 23...Concave portion.

Claims (1)

[Claims] 1. A removable container is supported by a pair of lift arms provided on the left and right sides of the vehicle body, and the lift arms are swung back and forth by the operation of a lift cylinder to load and unload the container. In the cargo handling vehicle, in order to maintain the attitude of the container during loading and unloading, a front arm is provided to support the upper front end of the container, and the front arm is rotatably attached to the vehicle body below the container, and the front arm is attached to the vehicle body below the container. An auxiliary cylinder for rotating the front arm is attached to the base of the front arm, and closed sections are formed on the left and right sides of the base, and between the closed sections, the auxiliary cylinder is attached to the base of the front arm. A cargo handling vehicle, characterized in that a recessed portion for attachment is formed.