JPH0133543Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention is designed to keep the floor surface of the loading platform and the top surface of the platform on the same level when loading and unloading cargo onto the loading platform of a truck or the like using a forklift or the like. This invention relates to a vehicle height regulating device for cargo handling work that can be flattened to improve the efficiency of loading and unloading work.

BACKGROUND TECHNOLOGY Conventionally, when cargo such as a container is loaded from a platform into the luggage compartment of a vehicle such as a container truck using a forklift or the like, or when it is unloaded onto the platform, there is a process as shown in FIGS. 7 and 8. In order for the forklift 1 to move back and forth between the luggage compartment 2 and the platform 3, a gangplank 4 is spanned between the two.

In addition, in a normal vehicle, when the cargo 5 is loaded, the tires are deformed and the chassis springs are deflected, lowering the vehicle height.
is set lower than the floor surface 7 of the luggage compartment 2.

Problems to be Solved by the Invention However, in the past, the gangplank 4 was simply passed between the luggage compartment 2 and the platform 3. Inclined due to the ups and downs of
Also, the slope changes constantly. Therefore, each time the forklift 1 crosses the gangplank 4, the cargo will come into contact with the floor or ceiling of the cargo area of the gangplank 4 unless the forklift 1 performs various operations such as tilting, lifting up or down, and slowing down or stopping. Resulting in.

For example, FIG. 5 shows a situation where the lower part of the cargo 5 has come into contact with the gangplank 4. To avoid such an accident, the forklift 1 is moved to the gangplank 4.
Before the deceleration or stop operation, a tilt operation or a lift-up operation must be performed as shown in FIG. 6.

Furthermore, Fig. 7 shows a situation in which the upper part of the cargo 5 has hit the ceiling of the cargo compartment 2, for example, the cargo compartment of a container truck, but in order to avoid such an accident, the cargo should be stopped in the middle of the gangplank 4. tilt or lift down operations must be performed. That is, the position of the baggage 5, which has been changed by lift-up or tilt operation in the state shown in FIG. 6, must now be further changed by performing the reverse operation. Only through such operations can the luggage 5 be safely stored in the luggage compartment as shown in FIG.

In this way, conventionally, the forklift 1 has to be operated frequently and in a variety of ways, which requires time and effort for cargo handling operations, and increases the risk of damage to the cargo.

In addition, as shown in FIG. 8, in order to increase the loading rate of the luggage 5, the space between the luggage 5 and the interior wall of the luggage compartment is minimized, and the forklift 1 is placed in the luggage compartment 2. When loading and unloading cargo, the cargo may vibrate due to deformation of tires and the like, making the above-mentioned cargo handling work even more troublesome.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a vehicle height regulating device for cargo handling work that can make the floor surface of the cargo compartment of the vehicle and the top surface of the platform almost coplanar. At least one regulation lift is installed on the ground below the luggage compartment of the vehicle, the upper surface of the platform is set at a higher position than the floor of the luggage compartment of the vehicle, and the end of the A gangplank that spans the floor of the luggage compartment is provided so as to be rotatable about the end thereof, and is adapted to the movement of the floor of the luggage compartment of the vehicle that is lifted by the vehicle height regulation lift. A configuration is adopted in which a sensor is fixedly installed at a fixed location other than the vehicle, which detects the position where the gangplank, which rotates along with the platform, is substantially flush with the top surface of the platform and issues a signal to stop the vehicle height regulation lift. are doing.

Operation: When the cargo compartment of the vehicle approaches the platform and stops, the gangplank pivots toward the cargo compartment and hooks onto the rear end of the compartment. Since the top of the platform is set higher than the floor of the cargo area, the gangplank slopes slightly downward.

Next, when the vehicle height regulation lift is operated and the luggage compartment of the vehicle is lifted, the gangplank also rotates upward in synchronization with it. When the gangplank is flush with the top surface of the platform, a sensor detects its position and issues a vehicle height regulation lift stop signal, and the lift stops and maintains its position.

In this state, the top surface of the platform, the gangplank and the floor of the cargo compartment form almost the same plane, and
The cargo compartment will no longer move up and down or vibrate, regardless of whether the cargo is increased or decreased.

Embodiment Next, an embodiment of the present invention will be described based on FIGS. 1 to 4.

In Figures 1 and 2, the reference numeral 8 is a platform as an accessory equipment for a warehouse or the like (not shown), and for vehicles arriving and departing, the rear end of the vehicle is restricted and the platform is stopped at a fixed position. A stopper 9 is installed for this purpose. In this case, the upper surface 10 of the platform 8 is set at a higher position than the floor surface 7 of the luggage compartment 2 of the vehicle. Floor surface 7 of luggage compartment 2
Although the height differs depending on the vehicle type, vehicle manufacturer, etc., it is formed higher than the general height of all of them, and is also formed higher than the height when the luggage compartment 2 is empty.

Further, reference numeral 11 denotes a span plate provided at the end of the platform 8, and as shown in FIG. 12, and its length is set to such an extent that it protrudes slightly ahead of the stopper 9, and the protruding portion 1
3 is formed into a thin plate shape, and is designed to prevent a large level difference from occurring between it and the floor surface 7 of the luggage compartment 2.

The span plate 11 is mechanically rotatable as shown in the second figure, and one end of a lever 13 rotatably supported by the shaft 12 is brought into contact with the lower surface of the span plate 11, and the other end is brought into contact with the lower surface of the span plate 11. is platform 8
It extends laterally and is connected to a rod 15 of a hydraulic cylinder 14 located in a cavity in the platform 8. Shape and size of lever 13, rod 1
The stroke etc. of No. 5 are set so that the gangplank 11 can rotate between position A and position C.

Therefore, when the rod 15 of the cylinder 14 acts to protrude, the spanning plate 11 is pushed up by the lever 13 from below and stops rotating to position A. Conversely, when the rod 15 is retracted, the spanning plate 11 is pushed up by the lever 13.
It rotates downward together with the rotation of , and reaches position C. At this time, the luggage compartment floor 7 of the vehicle is at position D, and the protrusion 13 of the spanning board 11 rests on the rear end of the luggage compartment floor and stops, while the lever 13 rotates a little more and the spanning board 11 stops.
Stop after releasing 1.

A vehicle height regulating lift 16 is installed on the ground below the luggage compartment of the vehicle stopped at the position D, as shown in FIG.

This lift 16 is shown in more detail in FIGS. 3 and 4. In these figures, reference numeral 17 is a base in contact with the ground 18, and on this base there are two
A hydraulic cylinder 19 is provided so as to be able to rise and fall. That is, the lower part of the cylinder 19 is connected to the base 17 via a shaft 20, and a block 21 is fixed to the middle part, and this block 21 and the base 17 are connected to the hydraulic cylinder 22 and the rod 23. are connected.

Therefore, when the luggage compartment 2 of the vehicle arrives, the hydraulic cylinder 22 is retracted to move the rear bumper 2 of the vehicle from the solid line position to the chain line position in FIG.
4 etc., and after the bumper 24 etc. has passed, the cylinder 22 is extended to the solid line position.

The thrust of the cylinder 19 is, for example, per one cylinder.
10 tons, two cylinders 19 rods 25
A chassis support beam 26 for supporting the vehicle's chassis is spanned between them to integrate them, and both cylinders 19 are also connected by a cross beam 27 to strengthen their integration. In addition, the above-mentioned chassis support beam 26
and the horizontal beam 27, the upper end is the chassis support beam 26.
Two guide rods 29 are provided on the left and right sides, and the lower part thereof is inserted into the bearing 28 of the cross beam 27.
Thereby, the hydraulic cylinder 19 is protected from the horizontal force caused by starting and stopping the forklift on the loading platform of the vehicle. Furthermore, the above two blocks 2
A rotating shaft 30 is spanned over the shaft 1, and a counter gear 31 is pivotally attached to both ends of the rotating shaft 30, and a rack 32 hanging from the chassis support beam 26 is engaged with the counter gear 31. This allows the two hydraulic cylinders 1
Even if an unbalanced load is applied due to a 9 differential, unbalanced load, misalignment of the vehicle's stopping position, etc.
Since the operations of the rods 25 of both hydraulic cylinders 19 are always synchronized, the chassis etc. lifted by the lift 16 will not tilt.

In addition, in FIGS. 3 and 4, reference numeral 33 is a liner fixed to the upper end of the chassis support beam 26. The upper part is curved so that the load is applied to the center of the cylinder 19, and the liner 33 is attached to the chassis support beam 26 to protect the chassis. It is made from a softer resin material. Also, code 3
Reference numeral 4 denotes a cover that is stretched between the base 17 and the chassis support beam 26 so that it can be unrolled and inserted in a blind manner.
When it falls down to the chain line position due to the action of step 2, it is unwound and covers the cylinder 19, guide rod 29, etc., and prevents muddy water, snow and ice, etc. adhering to the shaft etc. from splashing on it, thereby preventing rusting of the equipment and damage to the cylinder. be.

The lift 16 may be made movable by providing wheels under the base 17 (not shown), and may be moved to the side each time a vehicle enters or leaves the lift 16. In such a case, cylinder 19
may be fixed upright on the base 17, and the shaft 20 and cylinder 22 may be omitted.

In addition, the lift 16 is buried in the ground directly below the vehicle departure and arrival position together with the base 17, and when the vehicle approaches, the rod 25 is pulled to retract the chassis support beam 26 below the ground, and after the vehicle approaches, it protrudes to the ground. (not shown). In that case as well, the shaft 20 and cylinder 22 can be omitted.

After the vehicle has stopped, the lift 16 is brought into a state in which it starts lifting the chassis by first operating the cylinder 22 to raise the chassis support beam 26 and the like from the chain line position to the solid line position using the shaft 20 as a fulcrum. Then, by operating the cylinder 19, the chassis support beam 26 pushes up the chassis of the vehicle from below. During this time, the base 17 supports the entire load of the vehicle, lift, etc. via the lower end of the cylinder 19,
Further, the guide rod 29, counter gear 31, etc. prevent the two rods 25 from twisting. Then, when the cargo compartment floor surface 7 of the vehicle rises to a predetermined height, the cylinder 19 stops driving and is held at that position for a predetermined period of time. Therefore, during this period, the vehicle becomes almost unaffected by deformation of the chassis spring, tires, etc.

The lift 16 is interlocked with the gangplank 11, and is provided with a control device for this purpose.
As shown in FIG.
In this case, it is fixedly installed on the stopper 9. This sensor 35 is a limit switch, and
The contact point is closed or opened by being pushed by a dog 36 provided at the bottom of the contact point. The mounting positions of the sensor 35 and the dog 36 are set so that the dog 36 touches the sensor 35 when the spanning plate 11 is substantially flush with the upper surface 10 of the platform 8.

In addition to the sensor 31, the control device is also equipped with an operation panel (not shown), and the cylinder 19 of the lift is started by operating the operation panel, and the dog 36 is connected to the sensor 35. cylinder 19 of the lift based on the signal generated when touching the
It also has a function to stop the. The specific content of this control device is a known technical means, so a description thereof will be omitted. In addition, the sensor 3
In addition to the limit switch, 5 can be replaced with a light emitter/receiver made of a phototube or a proximity switch, or a similar effect can be obtained by attaching an angle meter using an inclinometer or potentiometer to the gangplate 11. Yes (not shown).

Therefore, when the protrusion 13 of the spanning board 11 is placed on the rear end of the cargo compartment floor 7 of the vehicle as described above, the dog 36 is at position F in FIG. 2 and is away from the limit switch 35. When the cylinder 19 of the lift 16 is driven by operating the operation panel, the cargo compartment floor 7 rises from position D to position E, and when the gangplank 11 rotates and comes to position B, the dog 36 hits limit switch 35. As a result, a signal for stopping the lift 16 is issued in the control device, the driving of the cylinder 19 is stopped, and the cargo compartment floor 7 is held at position E.

At this time, since the length of the vehicle and its luggage compartment is quite large compared to the length of the gangplank 11, the ground 1
8 is flat, it can be seen that the gangplank 11 and the cargo compartment floor 7 are substantially on the same plane.
If it is necessary to further improve the accuracy of this coplanarization, it is possible to set a plate under the front wheels of the vehicle in advance, or create a slope on the ground (not shown). .

Next, a series of operations of the vehicle height regulating device for cargo handling work will be described.

First, the luggage compartment 2 of the vehicle approaches the stopper 9 as indicated by the chain line D in FIG. Next, the driver of the vehicle or forklift operates the operation panel to bring the lift 16 into the upright position as shown in FIG. 4, and before or after that, also operates the cylinder 14 by operating the operation panel. The gangplank 11 at position A is rotated to position C. In position C, the gangplank 11 is released from the lever 13 and is supported downward by the luggage compartment 2.

Thereafter, the cylinder 19 of the lift 16 is driven by operating the operation panel, and the chassis support beam 26 is raised to lift the luggage compartment 2 of the vehicle to position E. Along with this, the gangplank 11 also rotates upward around the shaft 12, and the dog 36 also moves from the chain line position F to the solid line position G, and the limit switch 35 causes the gangplank 11 to be flush with the platform top surface 10. Detected. Based on the detection signal from the limit switch 35, the driving of the cylinder 19 of the lift 16 is stopped, and the chassis of the vehicle is in a state in which the luggage compartment 2 on the rear wheel 37 side shown in the first diagram is tilted and floated with the front wheels (not shown) as a fulcrum. is retained. Since the length of the luggage compartment 2 is considerably larger than the length of the spanning board 11, the upper surface 10 of the platform 8, the spanning board 11, and the floor surface 7 of the luggage compartment are substantially on the same plane. Moreover, lift 1
Since it is supported by 6, its state hardly changes even if external force is applied. Therefore, as shown in FIG.
It is possible to move back and forth between the platform 8, gangplank 11, and luggage compartment 2 without performing any tilting operations.

When the cargo handling work is completed, the lift 16 is lowered by the reverse operation to the above, and the rear wheels 37 of the vehicle are grounded.
The lift 16 is brought down and the gangplank 11 is further flipped upward. The vehicle then leaves platform 8.

Effects of the invention Since the present invention has the above-mentioned configuration and function, it is possible to make the floor surface of the luggage compartment of the vehicle, the gangplank, and the top surface of the platform almost on the same plane, and even when a load is applied to the luggage compartment, the tire It is possible to eliminate the relationship with deformation, etc., and prevent vibrations from occurring in the luggage compartment. Therefore, when loading and unloading cargo using a forklift or the like, there is no need to frequently repeat tilting, lifting up, down, deceleration, etc. of the forklift. This also means that even if the size of the cargo is set to minimize the space between the inner wall of the container and the cargo, the efficiency of cargo handling can be improved.
This also means that damage to the luggage can be suitably prevented.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the vehicle height regulating device for cargo handling work according to the present invention, and FIG. 1 is a portion showing the positional relationship between the device and the luggage compartment of a vehicle lifted by the device. Fig. 2 is a partially cutaway side view showing an enlarged view of the gangplate portion of the device, and Fig. 3 is a partially cutaway front view of the vehicle height regulation lift in the device, with the left half showing the lift-up state. The right half shows the lift-down state, Fig. 4 is a partially cutaway side view, Figs. 5 to 8 are illustrations of conventional cargo handling operations, and Fig. 5 shows the forklift in the standard state. A side view when crossing the gangplank, Figure 6 is a side view when crossing the gangplank by performing a tilt operation, and Figure 7 is a side view showing the relationship with the container when crossing the gangplank in the state shown in Figure 6. FIG. 8 is a side view of a state in which the container is about to enter the container by performing a tilt operation. 1: Forklift, 2: Loading platform, 5: Luggage,
7: Floor, 8: Platform, 9: Stopper,
10: Top surface, 11: Gangplank, 16: Lift, 1
9: cylinder, 25: rod, 35: sensor.

Claims (1)

[Scope of utility model registration request] In a vehicle height regulating device for cargo handling work that can make the floor surface of a cargo compartment of a vehicle substantially flush with the top surface of a platform, at least one vehicle height regulating lift is installed on the ground below the cargo compartment of the vehicle. , the upper surface of the platform is set at a higher position than the floor of the luggage compartment of the vehicle, and at its end there is a gangplank that spans the floor of the luggage compartment and rotates around the end of the platform as a fulcrum. a position where the gangplank, which is movably provided and rotates with the movement of the floor surface of the luggage compartment of the vehicle lifted by the vehicle height regulating lift, is substantially flush with the top surface of the platform; The vehicle height regulating device for cargo handling work is characterized in that a sensor is fixedly installed at a fixed location other than the vehicle to detect the vehicle height regulating lift and issue a stop signal for the vehicle height regulating lift.