JP7614895B2 - Cargo handling vehicles and loading equipment - Google Patents

Description

The present invention relates to a cargo handling vehicle, such as a vehicle transporter or container transporter, that has the ability to move part of the cargo bed or to lower part of the cargo bed to the ground.

Patent Document 1 discloses a body loading/unloading vehicle. The body loading/unloading vehicle disclosed in Patent Document 1 is a vehicle transporter used to transport vehicles such as passenger cars and civil engineering machinery. The vehicle transporter described in Patent Document 1 is equipped with a lift frame and a slidable slide body. In the vehicle disclosed in Patent Document 1, the lift frame can be tilted and the slide body (cargo platform) can be slid downward to lower the body to the ground.

All cargo handling vehicles are required to have rear bumpers. To ensure safety in the event of a collision with pedestrians or other vehicles, the rear bumper must protrude rearward from the vehicle body to a certain extent.
However, the above-mentioned vehicle transport vehicles, etc., have the function of tilting the loading platform backwards or lowering the loading platform from the rear to the ground, and since the rear bumper is attached in a protruding state toward the rear of the vehicle, the rear bumper gets in the way when tilting the loading platform, etc.
Therefore, a structure has been proposed in which the rear bumper can be retracted when performing operations such as loading and unloading (Patent Document 2).

Patent Document 2 discloses a freight vehicle having a jack that prevents the vehicle from tilting, and a structure in which the position of the bumper changes in conjunction with the jack.
In the truck disclosed in Patent Document 2, the position of the bumper changes when the jack is extended, preventing interference between the lift frame and the bumper during loading and unloading.

In the truck of Patent Document 2, when the lowering switch is operated, a series of lowering operations are performed according to a predetermined sequence control. In the truck of Patent Document 2, by turning on the lowering switch, the jack is extended, and in conjunction with this, the bumper changes from the extended state to the stored state. Then, the lowering operation starts.
That is, in the truck disclosed in Patent Document 2, when the lowering switch is turned on, the bumper automatically transitions from an extended state to a stored state, and then the lift frame retracts and a series of lowering operations begins.
According to the control adopted in Patent Document 2, the subsequent steps can be executed on the condition that the sensor detects that the lift frame has moved backward.

JP 2000-108768 A Patent No. 3871845

In the truck disclosed in Patent Document 2, when the lowering switch is turned on to perform the unloading operation, the bumper automatically transitions to a stored state, and a sensor detects that the bumper has entered the stored state, after which the actual unloading operation begins.
Conversely, if the detection means cannot detect that the bumper has entered the stored state, the lowering operation cannot be performed.
However, there are cases where there is some kind of malfunction and the bumper does not move even when the lowering switch is operated, making it impossible to lower the vehicle.

The present invention focuses on the above-mentioned problems of the conventional technology and aims to provide a cargo handling vehicle and loading device that can retract the bumper to perform unloading operations.

A mode for solving the above-mentioned problems is a cargo handling vehicle having a vehicle section and a loading device, the loading device being mounted on the vehicle section, the loading device having a loading/unloading device and a control device, and a series of unloading operations consisting of a plurality of operations and a series of loading operations consisting of a plurality of operations being carried out by the loading/unloading device, the cargo handling vehicle having a bumper device, the bumper device having a bumper body, the bumper body being capable of being moved by power between a driving position suitable for driving and a retracted stored position, a bumper switch capable of operating the bumper device, an automatic unloading switch capable of carrying out the unloading operation, and a switching means, the switching means being capable of changing the position of the bumper body between a driving position suitable for driving and a retracted stored position, the bumper switch being capable of operating the bumper device, an automatic unloading switch being capable of carrying out the unloading operation, and a switching means. It is possible to switch between an automatic priority state, in which the automatic lowering switch has priority and the bumper device cannot be operated by the bumper switch, and a bumper switch enabled state, in which the bumper device can be operated by the bumper switch. By turning on the automatic lowering switch in the automatic priority state, the lowering operation and the storage operation of moving the bumper body to a storage position are executed in conjunction with each other. In the lowering operation, there is a specific operation that can be executed on the condition that the bumper body is in a position that satisfies a predetermined condition. In the bumper switch enabled state, the bumper body can be moved by operating the bumper switch.

In the loading vehicle of this aspect, by turning on the automatic lowering switch in the automatic priority state, the lowering operation and the storing operation of moving the bumper body to the storing position are executed in coordination. In the loading vehicle of this aspect, there is a specific operation that can be executed on the condition that the bumper body is in a position that satisfies a predetermined condition.
The "predetermined condition" regarding the position of the bumper body and the "specific operation that can be performed" are not limited, but for example, if the loading vehicle has a lift frame like a vehicle carrier and has a mechanism for tilting the lift frame, the "predetermined condition" is that the bumper body is in the stored position, and the tilting of the lift frame or the retraction of the lift frame are the "specific operation that can be performed."
According to this example, tilting of the lift frame and retraction of the lift frame can be performed on the condition that the bumper body is in the storage position.
Also, without being limited thereto, if the loading vehicle has a loading arm like a container transporter and has a mechanism for swinging the loading arm, the "predetermined condition" is that the bumper body is in the stored position, and the swinging of the loading arm is the "specific action that can be performed."
According to this example, the loading arm can swing or move backward on the condition that the bumper body is in the stored position.
In the loading and unloading device of this embodiment, when the device is in the automatic priority state, the bumper device cannot be operated by the bumper switch, so even if the bumper switch is operated by mistake, the bumper body will not move and the bumper body etc. will not collide with other components.
On the other hand, when the bumper switch is in the enabled state, the bumper body can be moved by operating the bumper switch. Therefore, if the bumper body does not move even though the automatic lowering switch is in the on state, the bumper body can be moved by switching the bumper switch to the enabled state by the switching means, and the lowering operation can be continued.

In the above-mentioned embodiment, it is desirable that the retracting operation of the bumper is started around the time the lowering operation is started.

In each of the above-mentioned aspects, the loading/unloading device has a lift frame that moves in the forward/rearward direction and changes its posture to an inclined posture, and a slide body that moves linearly along the lift frame, and is capable of inclining the lift frame and linearly moving the slide body to land at least a part of the slide body on the ground, and is capable of performing a lowering operation of lowering the slide body to the ground and a loading operation of pulling the slide body onto the vehicle section,
The lowering operation includes a horizontal movement operation for moving the slide body from an initial position toward the rear side of the vehicle unit, and a tilting process for tilting the lift arm, and it is desirable that the horizontal movement operation and/or the tilting process can be executed on the condition that the bumper body is in the storage position.

The "horizontal movement operation of moving the slide body to the rear side of the vehicle unit" includes an operation of moving the slide body on the lift frame to the rear side of the vehicle unit by moving the lift frame to the rear side. There is also a case where the slide body is moved to the rear side of the vehicle unit by itself.
This embodiment is intended for a loading device, such as a vehicle carrier, that has a function of lowering a part of the loading platform to the ground.

In the above-mentioned aspect, it is preferable that the vehicle has any one of the following detection means and that the bumper is operated based on detection by any one of the detection means.
(1) An initial position detection means for detecting whether the slide body is in the initial position.
(2) A retracted position detection means for detecting when the slide body reaches the retracted position.
(3) A landing detection means for detecting that the lift frame has landed on the vehicle portion.

The above-mentioned detection means are conditions that determine when any of the equipment of the cargo handling vehicle starts to operate.
Although the use of each detection means is not limited, for example, the initial position detection means can be used as a trigger for moving the bumper body to the driving position during loading operation. That is, during loading operation, the movement of the bumper body to the driving position can be started on the condition that the initial position detection means is in the on state.
Also, during the lowering operation, the bumper body may be configured to start moving to the storage position on the condition that the initial position detection means is in an ON state.
The reverse continuation detection means can be used as a trigger for moving the bumper body to the storage position during the lowering operation. That is, during the lowering operation, the movement of the bumper body to the storage position can be started on the condition that the reverse continuation detection means is in the on state.
The landing detection means can be used, for example, as a trigger for moving the bumper body to the running position during a loading operation. That is, during a loading operation, the bumper body can be configured to start moving to the running position on the condition that the landing detection means is in an on state.

In the above-mentioned aspect, the loading device is for loading a container, and the loading/unloading device has a loading arm, which is equipped with an engagement portion that engages with the container, and is capable of engaging the engagement portion with the container placed on the ground, driving the loading arm to pull the container onto the vehicle section, and performing an unloading operation in which the container placed on the vehicle section is lowered to the ground by the loading arm, and it is desirable that the operation of the loading arm be in a state in which it can start, provided that the bumper body is in the storage position.

This aspect is targeted at container carriers.

In each of the above-mentioned aspects, it is desirable that the actuation switch is a loading switch that performs the loading operation, and that an extension operation that moves the bumper body to the driving position is performed before or after the completion of the loading operation, and that the bumper body be moved to the driving position even if the operation of the loading switch is interrupted.

According to this embodiment, the bumper body can be automatically moved to the driving position following the loading operation.

The loading device is a loading device mounted on a vehicle, and has a loading/unloading device, and a series of unloading operations consisting of a plurality of operations and a series of loading operations consisting of a plurality of operations are performed by the loading/unloading device, the loading vehicle has a bumper device, the bumper device has a bumper body, and the bumper body can be moved by power between a driving position suitable for driving and a retracted storage position, and has a bumper switch that can operate the bumper device, an automatic unloading switch that can perform the unloading operation, and a switching means, and the automatic unloading switch is given priority by the switching means, and the bumper It is possible to switch between an automatic priority state in which the bumper device cannot be operated by the bumper switch and a bumper switch enabled state in which the bumper device can be operated by the bumper switch, and by turning on the automatic lowering switch in the automatic priority state, the lowering operation and the storage operation of moving the bumper body to the storage position are executed in coordination, and the lowering operation includes a specific operation that can be executed on the condition that the bumper body is in a position that satisfies a specific condition, and in the bumper switch enabled state, the bumper body can be moved by operating the bumper switch.

The cargo handling vehicle and loading device of the present invention allow the bumper to be retracted to perform unloading operations.

1 is a side view of a loading vehicle (vehicle transporter) according to an embodiment of the present invention. 2A, 2B, and 2C are side views of the loading vehicle shown in FIG. 1, showing the operation of each part during unloading operation. 2(d), (e), and (f) are side views showing the operation of each part in the unloading operation of the loading vehicle shown in FIG. 1, which is continued from FIG. 2. 2A, 2B, 2C, and 2D are side views of the loading vehicle shown in FIG. 1, showing the operation of each part during loading operation. 5(e), (f) and (g) are side views showing the operation of each part in the loading operation of the loading vehicle shown in FIG. 1, subsequent to FIG. 4. FIG. 2 is a front view of the remote control device. 4 is a flowchart of an automatic unloading operation of the cargo handling vehicle shown in FIG. 1 . 4 is a flowchart of an automatic loading operation of the cargo handling vehicle shown in FIG. 1 . 10 is a flowchart showing an operation of the bumper device in a bumper switch effective mode. 11 is another flowchart showing the operation of the bumper device in the bumper switch effective mode. 13 is a side view and a partially enlarged view of a loading vehicle (container transport vehicle) according to another embodiment of the present invention. FIG. 12A, 12B, and 12C are side views showing the operation of each part during loading operation of the loading vehicle shown in FIG. 11 . 12(d), (e), and (f) are side views showing the operation of each part during loading operation of the loading vehicle shown in FIG. 11 . 12A, 12B, and 12C are side views showing the operation of each part during unloading operation of the loading vehicle shown in FIG. 11 . 12(d), (e), and (f) are side views showing the operation of each part during the unloading operation of the loading vehicle shown in FIG. 11, which is continued from FIG. 14. 12 is a flowchart of the automatic unloading operation of the cargo handling vehicle shown in FIG. 11 . 12 is a flowchart of an automatic loading operation of the cargo handling vehicle shown in FIG. 11 .

Hereinafter, an embodiment of the present invention will be described.
In the following description, the relationship between the front and rear is based on the front and rear of the loading vehicle 1. In other words, the front side means the driver's seat 100 side, and the rear side means the opposite side.
The loading vehicle 1 of this embodiment is a vehicle transporter, in which the slide body 32 that was on the vehicle section 5 is lowered to the ground and an automobile or the like is loaded onto it, and in this state the slide body 32 is pulled up onto the vehicle section 5 for transport.
1, the cargo handling vehicle 1 has a vehicle section 5 and a loading device 18. The loading device 18 has a loading/unloading device 26. The loading/unloading device 26 is roughly composed of a lift frame 30, a tilt mechanism (tilting means) 31, and a slide body 32.

The loading device 18 further includes a control device 6, a hydraulic device 7, and a bumper device 50. The loading device 18 further includes a remote control device 8 (hereinafter referred to as a remote control).
The vehicle section 5 is a vehicle body of a known truck, has an engine, and rotates wheels to travel on a road.
The lift frame 30 is mounted on a subframe 33 of the vehicle section 5, and swings about a pin (not shown) provided on the rear end side of the vehicle section 5. That is, the lift frame 30 can assume an inclined position as shown in Figs.
In addition, the lift frame 30 itself moves in the front-rear direction relative to the vehicle portion 5 by the action of a hydraulic cylinder (not shown).

The tilt mechanism (tilt means) 31 is composed of a hydraulic cylinder 35 and a link mechanism 36, and is used to tilt the lift frame 30 so that the rear side is downward. The tilt mechanism 31 is a tilt means that performs a tilting operation to change the angle of the lift frame 30.

The lift frame 30 is provided with a rear end detection means 17. The rear end detection means 17 is a known proximity sensor, photoelectric sensor, or the like, and detects whether the slide body 32 has reached the rear end of the lift frame 30.

The slide body 32 is slidably attached to the lift frame 30, and is suspended by a chain or the like (not shown) so as to move linearly along the lift frame 30. A footboard 37 is provided at the rear end of the slide body 32.
The footboard 37 is located at the rear end of the slide body 32 and can be changed between an upright position and a flat position.

An initial position detection means 15 is provided in either the vehicle section 5 or the loading device 18. The initial position detection means 15 is a known proximity sensor, photoelectric sensor, or the like, and detects whether the lift frame 30 and the slide body 32 are in the initial position or not.
Further, either the vehicle section 5 or the loading device 18 is provided with a reverse position detection means 16 and a continuous reverse detection means 70. The reverse position detection means 16 and the continuous reverse detection means 70 are known proximity sensors, photoelectric sensors, etc. The reverse position detection means 16 detects that the lift frame 30 and the slide body 32 have reached the reverse position. The continuous reverse detection means 70 detects that the lift frame 30 has left the initial position and is in the process of moving toward the reverse position.

Further, a landing detection means 71 is provided in either the vehicle section 5 or the loading device 18 .
The landing detection means 71 is a known proximity sensor, photoelectric sensor, or the like, and detects that the lift frame 30 is in a horizontal position substantially parallel to the subframe 33. That is, the landing detection means 71 detects that the lift frame 30 is landed on the vehicle section 5.
The above-mentioned detection means, specifically, the initial position detection means 15, the retreat position detection means 16, the continued retreat detection means 70 and the landing detection means 71 may be mechanical switches such as limit switches.

The bumper device 50 has a bumper body 10 and a bumper movement mechanism 52 that moves the bumper body 10 back and forth.
The bumper body 10 is a bar- or plate-shaped member extending in the width direction of the vehicle portion 5. The bumper body 10, like known bumpers, serves to absorb the impact of a collision and to prevent other vehicles from slipping under the vehicle portion 5.

The bumper moving mechanism 52 translates the bumper body 10 in the front-rear direction using a hydraulic cylinder 53 .
The bumper moving mechanism 52 has a guide (not shown), and moves the bumper body 10 in parallel in the front-rear direction by extending and retracting the hydraulic cylinder 53 .
The structure of the bumper moving mechanism 52 is not limited, and it may be a mechanism that employs a link mechanism or a mechanism that moves the bumper body 10 by a motor.
Furthermore, the bumper body 10 may not only be moved horizontally but also displaced in the height direction.

The bumper device 50 is capable of changing the position of the bumper body 10 by the bumper movement mechanism 52 between a driving position suitable for driving and a storage position retracted to the vehicle portion 5 side.
In this embodiment, the position in which the hydraulic cylinder 53 is extended and the bumper body 10 projects rearward is the driving position, and the position in which the hydraulic cylinder 53 is retracted and the bumper body 10 is positioned forward is the stored position.

In the cargo handling vehicle 1 of this embodiment, the bumper device 50 is provided with a storage detection means 55 and an extension detection means 56. The storage detection means 55 is a sensor that detects whether the bumper body 10 is in the storage position. The extension detection means 56 is a sensor that detects whether the bumper body 10 is in the traveling position.
The storage detection means 55 and the extension detection means 56 are known proximity sensors, photoelectric sensors, etc. The storage detection means 55 and the extension detection means 56 may be mechanical switches such as limit switches.

The hydraulic device 7 is equipped with a known hydraulic pump, solenoid valves, and the like.
The hydraulic pump rotates by receiving power transmission from the engine of the vehicle section 5. That is, the hydraulic device 7 is connected to the PTO shaft of the vehicle section 5, and when an operator operates a PTO switch (not shown), the hydraulic pump rotates and generates hydraulic pressure.
The hydraulic device 7 is provided with a solenoid valve that supplies hydraulic pressure to the hydraulic cylinder 35, and a solenoid valve that supplies hydraulic pressure to the hydraulic cylinder 53 (neither is shown).

The control device 6 includes a circuit for sending signals to each solenoid valve in accordance with a predetermined procedure. The signals from the control device 6 cause the loading/unloading devices 26 to operate in a predetermined sequence.
The control device 6 has a communication means for communicating with a remote control 8 .

As shown in FIG. 6, the remote control 8 is equipped with an automatic unloading switch 60 and an automatic loading switch 61 as operation switches for operating the loading/unloading device 26.
The remote control 8 is also equipped with a bumper extension switch 67 and a bumper retraction switch 68 as bumper operation switches (bumper switches) for operating the bumper moving mechanism 52 .
These switches 60, 61, 67, and 68 are all button switches that are turned on only while the operator is pressing them and turned off when the operator releases their hand.

Furthermore, the remote control 8 is provided with a mode changeover switch (changing means) 65 .
In this embodiment, by operating the mode change switch 65, it is possible to switch between an automatic priority mode (automatic priority state) in which the activation switch that operates the loading/unloading device 26 has priority and the bumper moving mechanism 52 cannot be activated by the bumper activation switch (bumper switch), and a bumper switch enabled mode (bumper switch enabled state) in which the bumper moving mechanism 52 can be activated by the bumper activation switch (bumper switch).

That is, when the operation mode is set to the automatic priority mode by the mode change switch (switching means) 65, a series of automatic lowering operations can be performed by turning on the automatic lowering switch 60. However, when the operation mode is the automatic priority mode, both the bumper extension switch 67 and the bumper retraction switch 68 are in an inactive state, and the bumper movement mechanism 52 cannot be operated by the bumper extension switch 67 or the bumper retraction switch 68.
The same applies to the automatic loading operation, and a series of automatic loading operations can be performed by turning on the automatic loading switch 61. However, when the operation mode is the automatic priority mode, both the bumper extension switch 67 and the bumper retraction switch 68 are in an inactive state, and the bumper movement mechanism 52 cannot be operated by the bumper extension switch 67 or the bumper retraction switch 68.

On the other hand, when the operating mode is switched to the bumper switch enabled mode (bumper switch enabled state) by the mode change switch (switching means) 65, both the bumper extension switch 67 and the bumper retraction switch 68 become enabled, and the bumper movement mechanism 52 can be operated by operating the bumper extension switch 67 or the bumper retraction switch 68.

The mode change switch (switching means) 65 is a switch that switches the driving mode each time it is pressed. For example, when the current driving mode is the automatic priority mode, pressing the mode change switch 65 switches the driving mode to the bumper switch enabled mode. When the current driving mode is the bumper switch enabled mode, pressing the mode change switch 65 switches the driving mode to the automatic priority mode.

In this embodiment, the loading/unloading device 26 and the bumper device 50 can be coordinated to perform an automatic unloading operation for automatically unloading the slide body 32. Also, the loading/unloading device 26 and the bumper device 50 can be coordinated to perform an automatic loading operation for automatically loading the slide body 32.
The automatic lowering operation is started by pressing the automatic lowering switch 60 and is executed by continuing to press the automatic lowering switch 60.
Therefore, the automatic lowering switch 60 is a lowering switch that executes the lowering operation, and has a function of starting the lowering operation and a function of continuing the lowering operation.
The automatic loading operation is initiated by pressing the automatic loading switch 61 and is executed by continuing to press the automatic loading switch 61 .
Therefore, the automatic loading switch 61 is a loading switch that executes the loading operation, and has a function of starting the loading operation and a function of continuing the loading operation.

Furthermore, in this embodiment, when the driving mode is the bumper switch enabled mode, it is also possible to operate the bumper extension switch 67 or the bumper retraction switch 68 to move only the bumper body 10 .
The bumper extension switch 67 and the bumper retraction switch 68 are switches that switch the solenoid valve that supplies hydraulic oil to the hydraulic cylinder 53 of the bumper moving mechanism 52.

When the bumper switch is in the valid bumper switch mode, if the bumper extension switch 67 is pressed and held, the bumper body 10 moves rearward toward the driving position. When the bumper body 10 leaves the storage position, the storage detection means 55 goes into a non-detecting state. When the bumper body 10 moves rearward and reaches the driving position, the extension detection means 56 goes into a detecting state.
When the bumper switch is in the enabled mode, if the bumper storage switch 68 is pressed and held, the bumper body 10 moves forward toward the storage position. When the bumper body 10 moves away from the driving position, the extension detection means 56 goes into a non-detection state. When the bumper body 10 moves forward and reaches the storage position, the storage detection means 55 goes into a detection state.

Next, we will explain the operation of the loading/unloading device 26 and other devices when loading the slide body 32.

2A, when the loading vehicle 1 is traveling, the lift frame 30 is in a horizontal position, and the slide body 32 is pulled up onto the lift frame 30. The lift frame 30 is in a horizontal position (on the floor), and is at its front end (initial position) in the front-rear direction. The slide body 32 is also at its front end (initial position).
Since the lift frame 30 and the slide body 32 are in the initial position, the initial position detection means 15 is in the ON state. Since the lift frame 30 is in the landing state, the landing detection means 71 is in the ON state.

Then, the loading/unloading device 26 lowers the slide body 32 to the ground.
The unloading operation is carried out by carrying out the following steps in sequence.
(1) Lift frame retreat process (slide body horizontal movement process)
(2) First tilting step (first tilting operation)
(3) Slide body lowering step (4) Second tilting step

(1) Lift frame retreat process (slide body horizontal movement process)
The lift frame retraction process is a process in which the lift frame 30 is moved backward while remaining in a horizontal position by a hydraulic cylinder (not shown).
The lift frame retracting step is also a horizontal movement operation for moving the slide body from the initial position to the rear side of the vehicle unit. The horizontal movement operation is an operation for moving the slide body relative to the vehicle unit.
When the lift frame 30 starts to move backward, the initial position detection means 15 is turned off, and instead the backward movement continuation detection means 70 is turned on.
As shown in FIG. 2C, when the lift frame 30 is retracted to a predetermined position, the retracted position detection means 16 detects this and turns on.

(2) First tilting step The first tilting step is the first tilting step in the lowering operation. In the first tilting step, the hydraulic cylinder 35 is started, the tilt mechanism 31 is operated, and the lift frame 30 is tilted to a certain angle as shown in Fig. 3(d). When the first tilting step is started and the lift frame 30 is tilted, the landing detection means 71 is turned off.
When the lift frame 30 is tilted to a predetermined angle as shown in FIG. 3(d), the tilt detection means 72 detects this and turns on, stopping the tilt mechanism 31 (tilt of the lift frame 30).

(3) Slide Body Descent Process The slide body descent process is a process in which the slide body 32 is moved in a straight line along the lift frame 30 toward the rear of the vehicle, and the rear end of the slide body 32 is landed on the ground to slide down the slide body 32, as shown in FIG. 3(e).
When the front part of the slide body 32 reaches the rear end of the lift frame 30, the rearmost end detection means 17 detects this and turns on, stopping the movement of the slide body 32 toward the rear of the vehicle.

3(f), the second tilting process is a process in which the lift frame 30 is raised to the maximum angle and the entire bottom surface of the slide body 32 is landed on the ground. The fact that the lift frame 30 has reached the maximum angle is detected by the tilt detection means 72.
The step plate 37 is then placed in a horizontal position, and the vehicle is loaded or unloaded.

The loading operation is generally performed by executing the unloading operation in the reverse order, that is, by sequentially executing the following steps:
(1) First tilt return process (first tilt operation)
(2) Slide body ascending step (3) Second tilt return step (4) Lift frame advancing step

(1) First tilt return process The first tilt return process is the first tilt operation in the loading operation. The first tilt return process is a process in which the tilt angle of the lift frame 30 is lowered from the state in which the entire bottom surface of the slide body 32 is landed on the ground as shown in Fig. 4(a) until the tilt detection means 72 is in the ON state as shown in Fig. 4(b), and the rear end of the lift frame 30 is lifted off the ground.

(2) Slide Body Lifting Process The slide body lifting process is a process in which the slide body 32 is moved along the lift frame 30 toward the front of the vehicle as shown in FIG. 4(c), and the entire slide body 32 is placed on the lift frame 30 as shown in FIG. 4(d).

(3) Second Tilt Returning Step The second tilt returning step is a step of further lowering the angle of the lift frame 30 to return it to the horizontal position, as shown in FIG. 5( e ).
When the lift frame 30 returns to the horizontal position, the retracted position detection means 16 is turned on, and the landing detection means 71 is switched to the on state.

(4) Lift Frame Advancement Process The lift frame advancement process is a process of advancing the lift frame 30 and returning the lift frame 30 to the initial position as shown in Fig. 5(f). When the lift frame 30 starts to advance, the retreat position detection means 16 is turned off and the retreat continuation detection means 70 is turned on.
5G, when the lift frame 30 and the slide body 32 return to their initial positions, the initial position detection means 15 is turned on. When the lift frame 30 returns to its initial position, the continued backward movement detection means 70 is turned off.

Next, the automatic unloading operation of the cargo handling vehicle 1 of this embodiment will be described.
When the automatic unloading operation is to be performed, the operation mode is set in advance to the automatic priority mode by the mode change switch 65 .
In the automatic unloading operation, the loading/unloading device 26 and the bumper device 50 operate in cooperation with each other. That is, in the automatic unloading operation, the loading/unloading device 26 and the bumper device 50 operate according to a series of sequence controls.
The remote control 8 employed in this embodiment has an automatic lowering switch 60. The operation mode is the automatic priority mode, and as long as the automatic lowering switch 60 is kept pressed, a series of bumper operations and lowering operations continues.

Before the automatic unloading operation starts, the loading/unloading device 26 is returned to its initial position as shown in FIG. 2( a ), and this state is detected by the initial position detection means 15 .
2(a), the hydraulic cylinder 53 of the bumper body 10 is in an extended state, and the bumper body 10 is in a driving position, projecting rearward. Therefore, the projection detection means 56 is in a detecting state. Also, the storage detection means 55 is in a non-detecting state.

When the slide body 32 is lowered to the ground, the automatic lowering switch 60 is kept pressed.
The control of the automatic lowering operation will now be described with reference to the flow chart of FIG.
As a prerequisite, an operator operates a PTO switch (not shown), the hydraulic pump rotates, hydraulic pressure is generated, and hydraulic oil can be supplied to each hydraulic cylinder 35, 53 by opening and closing each solenoid valve.
In step 1, the process waits for operation of the automatic lowering switch 60. When the worker presses the automatic lowering switch 60, the automatic lowering switch 60 is turned on, and the process proceeds to step 2 and onward.

In step 2, the lift frame 30 starts to move backward. As shown in Fig. 2(b), the lift frame 30 starts to move backward, and the fact that this is a continuing state is detected by the reverse movement continuation detection means 70. That is, the reverse movement continuation detection means 70 is turned on, step 3 becomes YES, and the process proceeds to step 4, where the bumper body 10 moves toward the storage position.
Specifically, the solenoid valve that supplies hydraulic oil to the hydraulic cylinder 53 of the bumper moving mechanism 52 is switched.
As a result, the hydraulic cylinder 53 of the bumper moving mechanism 52 contracts, and the bumper body 10 moves toward the front side of the vehicle portion 5.

In the following steps 5 and 6, it is confirmed whether the lift frame 30 has reached the retreated position and whether the bumper body 10 has reached the stored position.
That is, the detection state of the retracted position detection means 16 is confirmed, and if the retracted position detection means 16 is in the ON state, step 5 becomes YES.
Furthermore, the storage detection means 55 is turned on to detect that the bumper body 10 is in the storage position, so that the answer to step 6 becomes YES.
In other words, if the lift frame 30 reaches the retreated position and the retreated position detection means 16 is in the ON state, and the bumper body 10 is in the stored position and the storage detection means 55 is in the ON state, the process proceeds to step 7, and the first tilting step is executed.

In this manner, in the present embodiment, the first tilting step is executed on the condition that the bumper body 10 is in the storage position as a predetermined condition. In other words, on the condition that the bumper body 10 is in the storage position, the tilting step as a specific operation can be executed.
In step 7, a first tilting step is performed, and the lift frame 30 is tilted to a certain angle.
Then, the process proceeds to step 8, where a slide body lowering step is performed. Then, the process proceeds to step 9, where a second tilting step is performed, whereby the slide body 32 is lowered to the ground.

In this embodiment, since it is confirmed that the bumper body 10 is in the storage position at the beginning of the automatic lowering operation, the slide body 32 and the like do not come into contact with the bumper body 10 even when the first tilting process or the second tilting process is executed.

When the worker releases the automatic unloading switch 60 during the operation, the loading/unloading device 26 stops at that point. When the worker presses the automatic unloading switch 60 again, the above-mentioned series of operations is restarted from the stopped state. In other words, the operation of the loading/unloading device 26 has already started, and the movement of the loading/unloading device 26 has only been temporarily stopped by the worker releasing the automatic unloading switch 60, so when the worker presses the automatic unloading switch 60 again, the above-mentioned series of operations is restarted from the stopped state.
When the lowering operation is completed, step 10 becomes YES, and the series of automatic lowering operations ends.

If the storage detection means 55 does not detect that the bumper body 10 is in the storage position, the subsequent lowering operation will not start in principle.
According to this embodiment, the lift frame 30 is tilted after it is confirmed that the bumper body 10 has moved to the storage position, so that the slide body 32 and the like do not come into contact with the bumper body 10.

For some reason, even if the worker continues to press the automatic lowering switch 60, the storage detection means 55 may not be able to detect that the bumper body 10 is in the stored position.
To explain this in accordance with the embodiment described above, in step 2, the lift frame 30 begins to retreat, and when the continued retreat detection means 70 detects that this operation is continuing, the bumper body 10 moves toward the storage position.
That is, the reverse movement continuation detection means 70 is turned on, step 3 becomes YES, and the process proceeds to step 4 where the bumper body 10 moves toward the storage position.
If the continued reverse detection means 70 malfunctions or has some other temporary problem and the continued reverse detection means 70 does not turn on, it is not possible to proceed to the subsequent steps and the unloading operation will be interrupted.

When this situation occurs, the operator presses the mode changeover switch (changing means) 65 to temporarily change the driving mode to the bumper switch enabled mode.
As a result, the bumper extension switch 67 and the bumper retraction switch 68 are activated, and the bumper movement mechanism 52 can be operated by operating the bumper extension switch 67 or the bumper retraction switch 68 .

Explaining this with reference to the flowchart in Figure 9, when steps 1 and 2 are both YES, the driving mode is the bumper switch enabled mode, and the bumper storage switch 68 is in the on state, the process proceeds to step 3, in which the bumper moving mechanism 52 is driven to move the bumper body 10 toward the storage position.
If the operation mode remains in the bumper switch effective mode and the worker continues to press the bumper storage switch 68, the bumper body 10 continues to move toward the storage position and finally reaches the storage position. As a result, the storage detection means 55 is turned on, and the series of operations shown in the flow chart of FIG. 9 is completed.

The same is true when moving the bumper body 10 to the driving position. Explaining with reference to the flowchart in Fig. 10, when both steps 1 and 2 are YES, the driving mode is the bumper switch enabled mode, and the bumper extension switch 67 is in the ON state, the process proceeds to step 3, in which the bumper moving mechanism 52 is driven to move the bumper body 10 toward the driving position.
If the operation mode remains in the bumper switch enabled mode and the operator continues to press the bumper extension switch 67, the bumper body 10 continues to move toward the driving position and finally reaches the driving position. As a result, the extension detection means 56 is turned on, and the series of operations ends.

Returning to the explanation of the automatic lowering operation shown in FIG. 7, the operation mode is temporarily switched to the bumper switch enabled mode, and the bumper storage switch 68 is operated, so that the storage detection means 55 is in the ON state.
Under this circumstance, the mode changeover switch (switching means) 65 is pressed again to return the operation mode to the automatic priority mode, and the automatic lowering switch 60 is pressed to resume the automatic lowering operation.
As a result, step 6 in the flow chart of FIG. 7 becomes YES, and the process proceeds to step 7 and onwards, whereby the unloading operation can be completed.

In the embodiment described above, in step 2, the lift frame 30 is retracted, which is detected by the continued retraction detection means 70, and when the continued retraction detection means 70 is turned on, the bumper body 10 is controlled to move toward the storage position.
However, the present invention is not limited to this configuration, and for example, when the initial position detection means 15 turns off, it may detect that the lift frame 30 is being moved backward, and when the initial position detection means 15 turns off, the bumper body 10 may be controlled to move toward the storage position.
Also, the bumper body 10 may be moved toward the storage position before the lift frame 30 starts to move backward.
In any case, it is desirable to start a storage operation for moving the bumper body 10 to the storage position around the time when the lowering operation starts.
In addition, the lift frame 30 may start to move backward on the condition that the bumper body 10 is in the storage position.

Next, the control of the automatic loading operation will be described with reference to the flow chart of FIG.
In the control of the automatic loading operation, in step 1, the operation of the automatic loading switch 61 is awaited. When the operator presses the automatic loading switch 61, the automatic loading switch 61 is turned on and the process proceeds to step 2.

In step 2, the bumper body 10 is moved toward the storage position, and in step 3, the storage detection means 55 determines whether or not the bumper body 10 is in the storage position.
Usually, when the automatic loading operation starts, the bumper body 10 is in the storage position, so in many cases, step 2 is ignored and the process proceeds to step 3, whereupon the answer to step 3 becomes YES, leading to step 4, where the loading operation begins.

In step 5, the first tilt return process is carried out, and the angle of the lift frame 30 is lowered from the state in which the entire bottom surface of the slide body 32 is on the ground as shown in FIG. 4(a) to the state in FIG. 4(b), and the rear end of the lift frame 30 is lifted off the ground.

In the following step 6, a slide body lifting step is executed, and the slide body 32 is moved toward the front side of the vehicle along the lift frame 30 as shown in FIG. 4(c).
In the following step 7, a second tilt returning step is executed, and the angle of the lift frame 30 is further decreased and returned to the horizontal position.
In the next step 8, the lift frame 30 moves forward. Then, the loading/unloading device 26 returns to the initial position, and the initial position detection means 15 detects this.

As a result, step 9 becomes YES and the process moves to step 10.
In step 10, the automatic loading switch 61 is electrically self-maintained in the on state. As a result, even if the operator releases the automatic loading switch 61, the process from step 10 onwards continues.
In the next step 11, the solenoid valve that supplies hydraulic oil to the hydraulic cylinder 53 of the bumper moving mechanism 52 is switched.
As a result, the hydraulic cylinder 53 of the bumper moving mechanism 52 extends, and the bumper body 10 moves to the rear side of the vehicle portion 5, until the bumper body 10 reaches the driving position.
Therefore, it is possible to prevent the loading vehicle 1 from moving away with the bumper body 10 in the storage position.
When the extension detection means 56 detects that the bumper body 10 has reached the driving position, step 13 becomes YES, and the series of automatic loading operations ends.

Even during automatic loading operation, the loading/unloading device 26 is operated after it is confirmed that the bumper body 10 is in the storage position, so that the slide body 32 and the like do not come into contact with the bumper body 10 during the loading process.
Moreover, step 3 is performed before the lift frame 30 is operated, and the lift frame 30 is operated after it is confirmed that the bumper body 10 is in the storage position, so that the slide body 32 and the like do not come into contact with the bumper body 10 during the loading process.

Even during the automatic loading operation, there are cases where the storage detection means 55 does not detect that the bumper body 10 has moved to the storage position and step 3 does not become YES even though the worker continues to press the automatic loading switch 61. In such a case, the worker presses the mode change switch (changing means) 65 to change from the driving mode to the bumper switch valid mode.
As a result, the bumper extension switch 67 and the bumper retraction switch 68 are activated, and the bumper movement mechanism 52 can be operated by operating the bumper extension switch 67 or the bumper retraction switch 68 .
If the operation mode remains in the bumper switch enabled mode and the worker continues to press the bumper storage switch 68, the bumper body 10 continues to move toward the storage position and finally reaches the storage position. As a result, the storage detection means 55 is turned on, and the loading operation can proceed.

The same applies if the bumper body 10 does not move to the driving position due to a failure of the initial position detection 15 even though the lift frame 30 has returned to its initial position, in which case the worker presses the mode change switch (switching means) 65 to switch from the driving mode to the bumper switch enabled mode.
Then, the operator presses the bumper extension switch 67. If the operation mode remains in the bumper switch enabled mode and the operator continues to press the bumper extension switch 67, the bumper body 10 continues to move toward the traveling position and finally reaches the traveling position. As a result, the extension detection means 56 is turned on, step 12 becomes YES, and the series of automatic loading operations ends.

Although the embodiment has been described above by taking a vehicle transporter as an example of the loading vehicle 1, the present invention can also be applied to a container-carrying vehicle as shown in FIG.
11, the cargo handling vehicle 1 has a vehicle section 5 and a loading device 17. The loading device 17 includes a control device 6, a hydraulic device 7, and a bumper device 50.

The loading device 17 has a container placement section 11 for placing a container 2 thereon, and a loading arm 3 .
The container placement section 11 is a frame on which the container 2 is placed, and has a gate-shaped protective frame 12 at its front end. The protective frame 12 is provided with an initial position detection means 15.

The loading arm 3 is composed of a hook arm 20 and a lift arm 21.
The loading arm 3 has a hook arm 20 attached to the tip of a lift arm 21 so as to be able to swing at an angle, and has a generally L-shaped overall shape. A hydraulic cylinder 22 is attached between the hook arm 20 and the lift arm 21, and the angle of the hook arm 20 relative to the lift arm 21 changes when the hydraulic cylinder 22 is extended or retracted.
A hook (engagement portion) 23 is provided at the tip of the hook arm 20 .
The base end of the lift arm 21 is swingably attached to the vehicle section 5, and the loading arm 3 can swing as a whole. A hydraulic cylinder 25 is attached to the lift arm 21, and the loading arm 3 swings as a whole by the hydraulic cylinder 25.

For the loading vehicle 1, the loading arm 3 and the bumper device 50 can be linked to perform an automatic unloading operation in which the container 2 is automatically unloaded. Also, the loading arm 3 and the bumper device 50 can be linked to perform an automatic loading operation in which the container 2 is automatically loaded.

Next, the operation of the loading arm 3 and the like when loading the container 2 will be described.
When the container 2 placed on the ground is loaded onto the vehicle section 5, the hook (engagement section) 23 of the loading device 17 is engaged with the engagement pin 27 of the container 2, as shown in Figures 11 and 12(a). At this time, the hook arm 20 is in a slightly acute angle position with respect to the lift arm 21.
In this state, the lift arm 21 is swung forward (counterclockwise in the drawing).
As a result, the front side of the container 2 is lifted up as shown in Fig. 12(b), and then, as shown in Fig. 12(c), the container 2 is pulled into the vehicle section 5. Then, as shown in Fig. 13(d), the lift arms 21 are further swung to return the position of the lift arms 21 to a substantially horizontal position.
As a result, the container 2 is placed in a substantially horizontal position, and is loaded onto the loading vehicle 1 with the engagement pin 27 facing forward. Thereafter, as shown in FIG. 13(e), the hook arm 20 is swung to approach a vertical position relative to the lift arm 21, and the container 2 is slid forward.
The state when the loading of the container 2 onto the loading vehicle 1 is completed is as shown in Figure 13 (f), where the hook arm 20 is in an approximately vertical position, the hook arm 20 is close to the protective frame 12, and the initial position detection means 15 detects that the loading arm 3 has returned to its initial position.

Next, the operation of the loading arm 3 and the like when the container 2 is lowered will be described.
When the container 2 is lowered from the cargo handling vehicle 1, the hook arm 20 is swung backward (clockwise in the drawing) and then the lift arm 21 is changed to an inclined posture as shown in Figures 14 and 15. As a result, the container 2 is slowly lowered to the ground.
That is, as shown in FIG. 14(c), the hook arm 20 is swung backward (clockwise in the drawing), the position of the lift arm 21 is changed at an acute angle, and the container 2 is slid backward.
Next, as shown in Fig. 15(d), the lift arm 21 is swung backward (clockwise in the drawing) to tilt the attitude of the lift arm 21. As shown in Fig. 15(e), the lift arm 21 is swung further backward (clockwise in the drawing) to land the rear end of the container 2 on the ground.
Then, the lift arm 21 is swung further backward (clockwise in the drawing) and the hook arm 20 is swung slightly forward (counterclockwise in the drawing) until the front end of the container 2 lands on the ground as shown in Figure 15 (f), and the container 2 is lowered to the ground.

Next, the automatic unloading operation of the cargo handling vehicle 1 of this embodiment will be described.
In the automatic lowering operation, the loading arm 3 and the bumper device 50 operate in cooperation with each other. That is, in the automatic lowering operation, the loading arm 3 and the bumper device 50 operate according to a series of sequence controls.

When the container 2 is loaded onto the vehicle section 5, the hook arm 20 is in an approximately vertical position as shown in Figure 14 (a), and the loading arm 3 is returned to its initial position, and this state is detected by the initial position detection means 15.
14(a), the hydraulic cylinder 53 of the bumper body 10 is in an extended state, and the bumper body 10 is in a driving position protruding rearward. Therefore, the protruding detection means 56 is in a detecting state. Also, the retracting detection means 55 is in a non-detecting state.

When lowering the container 2 to the ground, the automatic lowering switch 60 is pressed and held down.
The control of the automatic lowering operation will be described below with reference to the flow chart of FIG.
In step 1, the process waits for operation of the automatic lowering switch 60. When the worker presses the automatic lowering switch 60, the automatic lowering switch 60 is turned on, and the process proceeds to step 2, where the bumper body 10 moves to the storage position.
When the bumper body 10 moves forward, it reaches the front end and reaches the storage position as shown in Figure 14 (b), and the storage detection means 55 detects that the bumper body 10 is in the storage position.

When the storage detection means 55 detects that the bumper body 10 is in the storage position, step 3 becomes YES and the process proceeds to step 4. In step 4, a series of lowering operations are performed.

If the storage detection means 55 does not detect that the bumper body 10 is in the storage position, the subsequent lowering operation will not start in principle.
In this case, as described above, the mode changeover switch (changing means) 65 is pressed to change from the driving mode to the bumper switch effective mode, and the bumper storage switch 68 is pressed to move the bumper body 10 toward the storage position.

When loading a container 2 on the ground onto the vehicle section 5, as shown in Figures 11 and 12(a), the hook 23 of the loading device 17 is engaged with the engagement pin 27 of the container 2, and the automatic loading switch 61 is kept pressed.
The control of the automatic loading operation will now be described with reference to the flow chart of FIG.
In step 1, the process waits for operation of the automatic loading switch 61. When the operator presses the automatic loading switch 61, the automatic loading switch 61 is turned on and the process moves to step 2.

In step 2, the bumper body 10 moves to the storage position. Usually, at the start of the automatic loading operation, the bumper body 10 is in the storage position, so in many cases, step 2 is ignored and the process proceeds to step 3, and if step 3 is YES, the process proceeds to step 4, and the series of loading operations begins.
12(b) to 13(f), the front side of the container 2 is lifted and pulled into the vehicle section 5, the lift arm 21 is returned to a substantially horizontal position, and the hook arm 20 is further swung to approach a vertical position relative to the lift arm 21, causing the container 2 to slide forward. Then, the loading arm 3 returns to its initial position, which is detected by the initial position detection means 15.

As a result, step 5 becomes YES and the process moves to step 6.
Steps 6 and after are the same as steps 10 and after in Figure 8. Even if the worker releases his/her hand from the automatic loading switch 61, the process from step 6 onwards continues, and in step 7 the bumper body 10 moves to the rear side of the vehicle section 5, and the bumper body 10 reaches the driving position.
When the extension detection means 56 detects that the bumper body 10 has reached the driving position, step 8 becomes YES, and the series of automatic loading operations ends.
If the bumper body 10 does not move to the traveling position during the automatic loading operation, the mode changeover switch (changing means) 65 is pressed to change over to the bumper switch valid mode.
Then, the bumper extension switch 67 is pressed to move the bumper body 10 toward the traveling position, and the automatic loading operation is completed.

The loading arm 3 described above is of a type called a swing type, and both the hook arm 20 and the lift arm 21 can only swing and cannot move linearly.
In contrast to this, a loading arm called a sliding type is known, in which some members of the loading arm move linearly.
The present invention is not limited to those employing a swing-type loading arm 3, but can also be applied to loading vehicles employing a sliding-type loading arm.

In the embodiment described above, the mode changeover switch 65 is exemplified as a changeover means for changing over between the automatic priority state and the bumper switch enabled state. The mode changeover switch 65 employed in the embodiment changes the driving mode every time it is pressed, and is easy to use.
However, the present invention is not limited to this type of switch as the switching means, and other types may be used. For example, a switch for changing to the automatic priority state and a switch for changing to the bumper switch enabled state may be provided. Also, other switches and switching means may be used in combination. For example, the driving mode may be switched by pressing and holding the bumper retracting switch 68 or the bumper extending switch 67.
Moreover, the mode changeover switch 65 may be provided in the vehicle section 5 (near the control device).

In the embodiment described above, the loading/unloading device 26 is equipped with an automatic unloading switch 60 and an automatic loading switch 61 as operation switches for operating the loading/unloading device 26, but there may also be further switches for operating each part of the loading/unloading device 26 individually.
For example, the remote control 8 may have the following switches:
(1) A switch for moving the lift frame 30 rearward.
(2) A switch for moving the lift frame 30 forward.
(3) A switch that swings the lift frame 30 in a direction that makes the lift frame 30 more inclined.
(4) A switch that swings the lift frame 30 in a direction that makes the inclination of the lift frame 30 gentler.
(5) A switch for lowering the slide body 32.
(6) A switch for raising the slide body 32.

In the embodiment described above, control is adopted in which the loading/unloading device 26 is ready to start operating when the storage detection means 55 detects that the bumper body 10 is in the storage position, not only when the unloading operation is performed but also when the loading operation is performed, but this control may be adopted only when the unloading operation is performed.

In the above-described embodiment, a button switch is used as the switch of the remote control. The button switch used in the above-described embodiment is a type of momentary switch that is turned on only while the operator is pressing it and turns off when the operator releases the button.
However, the present invention is not limited to using this type of switch, and it is also possible to use a switch that, once the on switch is operated, maintains the on state until it is turned off (alternate switch), or a switch that electrically maintains the on state by itself.

The loading vehicle 1 described above performs (1) the lift frame retraction process, (2) the first tilting process, (3) the slide body lowering process, and (4) the second tilting process in that order during the unloading operation, but it is not essential to execute all of these processes. For example, the lift frame retraction process may be omitted. Also, the second tilting process may be omitted.

In the embodiment described above, tilting the lift frame and retracting the lift frame are given as examples of "specific operations that can be performed when the bumper body is in a position that satisfies certain conditions," but the present invention is not limited to this and includes any operation in which the bumper body 10 or its moving mechanism 32 interferes with the lift frame or slide body.

The loading and unloading vehicle 1 described above is designed to load and unload vehicles by lowering the slide body 32 completely to the ground and placing it horizontally and upright, but it may also be designed to load and unload vehicles with the slide body 32 in an inclined state.

As the horizontal movement operation for moving the slide body from the initial position to the rear side of the vehicle part (moving the slide body backward with respect to the vehicle part), the lift frame retraction process for moving the slide body 32 backward by moving the lift frame 30 backward was performed, but the horizontal movement operation may be a slide body retraction process for moving the slide body 32 backward with respect to the lift frame 30 without moving the lift frame 30. In this case, the slide body retraction process moves the slide body 32 backward by a chain or the like provided on the lift frame 30. When the slide body 32 retracts to a predetermined position, the retraction position detection means 16 detects the slide body 32 and turns on, stopping the movement of the slide body 32. In this case, the retraction position detection means 16 may be provided at the middle position of the lift frame 30.
The lift frame advancement process is similar.

Reference Signs List 1: cargo handling vehicle 2: container 3: cargo handling arm 5: vehicle section 6: control device 8: remote control 10: bumper body 11: container placement section 15: initial position detection means 16: retreat position detection means 17: loading device 18: loading device 20: hook arm 21: lift arm 23: hook (engagement section)
26 Loading/unloading device 30 Lift frame 31 Tilt mechanism (tilt means)
32 Slide body 50 Bumper device 52 Bumper moving mechanism 55 Storage detection means 56 Extension detection means 60 Automatic lowering switch 61 Automatic loading switch 65 Mode changeover switch (changeover means)
67 Bumper extension switch 68 Bumper storage switch 70 Reverse continuation detection means 71 Landing detection means

Claims (7)

A cargo handling vehicle having a vehicle section and a loading device, the loading device being mounted on the vehicle section,
The loading device has a loading/unloading device and a control device,
In a cargo handling vehicle in which a series of unloading operations consisting of a plurality of operations and a series of loading operations consisting of a plurality of operations are performed by the loading and unloading device,
A bumper device is provided, the bumper device having a bumper body, and the bumper body can be moved between a traveling position suitable for traveling and a retracted storage position by power,
a bumper switch capable of operating the bumper device; and an automatic lowering switch capable of carrying out the lowering operation ;
The vehicle further includes a switching means capable of switching between a bumper switch enabled state and an automatic priority state,
The bumper body can be moved by operating the bumper switch in the bumper switch enabled state, and
In the automatic priority state,
The bumper device cannot be operated by the bumper switch,
and,
By turning on the automatic lowering switch,
A specific operation that can be performed on the condition that the bumper body is in a position that satisfies a predetermined condition is included.
The lowering operation,
and
A storage operation that is performed in conjunction with the lowering operation,
moving the bumper body to the storage position ;
A loading vehicle characterized in that a storage operation is performed . 2. The cargo handling vehicle according to claim 1, wherein the storing operation is started around the time when the unloading operation is started. The loading/unloading device has a lift frame that moves in a front-rear direction and changes its posture to an inclined posture, and a slide body that moves linearly along the lift frame,
The lift frame can be tilted to move the slide body linearly so that at least a portion of the slide body can land on the ground;
The lowering operation includes an operation of lowering the slide body to the ground,
The loading operation includes an operation of pulling the slide body onto the vehicle section,
The lowering operation further includes a horizontal movement operation for moving the slide body from an initial position toward the rear side of the vehicle part, and a tilting step for tilting a lift arm,
3. The cargo handling vehicle according to claim 1, wherein the horizontal movement operation and/or the tilting step can be performed on the condition that the bumper body is in the stored position. 4. The loading vehicle according to claim 3, wherein the movement of the bumper body is started upon detection by any one of the following detection means:
( 1 ) An initial position detection means for detecting whether the slide body is in the initial position.
(2) A retracted position detection means for detecting when the slide body reaches the retracted position, which is the rear position .
(3) A landing detection means for detecting that the lift frame is landed on the vehicle portion. The loading device is for loading a container, and the loading/unloading device has a loading arm,
The loading arm has an engagement portion that engages with the container,
the loading operation includes an operation of engaging the engagement portion with the container placed on the ground and driving the loading arm to pull the container onto the vehicle portion;
the lowering operation includes an operation of lowering the container placed on the vehicle section to the ground by the loading arm,
3. The loading vehicle according to claim 1, wherein the loading arm is capable of starting to move on the condition that the bumper body is in the stored position. a loading switch for performing the loading operation;
A loading vehicle as described in any one of claims 1 to 5, characterized in that an extension operation is performed to move the bumper body to the traveling position before or after the completion of the loading operation, and the bumper body is moved to the traveling position even if the operation of the loading switch is interrupted. A loading device mounted on a vehicle,
Having loading and unloading equipment,
A loading device in which a series of unloading operations consisting of a plurality of operations and a series of loading operations consisting of a plurality of operations are performed by the loading/unloading device,
The vehicle has a bumper device having a bumper body, the bumper device being capable of changing the position of the bumper body between a driving position suitable for driving and a retracted storage position by power;
The loading device has a bumper switch capable of operating the bumper device and an automatic unloading switch capable of carrying out the unloading operation,
The loading device further includes a switching means capable of switching between a bumper switch enabled state and an automatic priority state,
The bumper body can be moved by operating the bumper switch in the bumper switch enabled state, and
In the automatic priority state,
The bumper device cannot be operated by the bumper switch,
and,
By turning on the automatic lowering switch,
A specific operation that can be performed on the condition that the bumper body is in a position that satisfies a predetermined condition is included.
The lowering operation,
and
A storage operation that is performed in conjunction with the lowering operation,
moving the bumper body to the storage position ;
A loading device characterized in that a storage operation is performed .

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