JP2004224082A - Warning device in load receiving block lifting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a warning device in a load receiving block lifting device capable of preventing an accident such as falling of cargo and performing highly safe work by warning a worker that the load receiving block tilts during a lifting operation. <P>SOLUTION: In the load receiving block lifting device X, the load receiving block 6 is liftably disposed between the ground and a load block 15 located at a predetermined height from the ground via a link mechanism, and the load receiving block 6 is tilted on the ground so that its tip comes into contact with the ground. The load receiving block lifting device is constituted by having a detector 71 for detecting the tilting of the load receiving block 6 during the lifting operation, and actuating a warning means based on the detection of the detector 71. The link mechanism is constituted by having a tilt link 2 for tilting the load receiving block 6 on the ground so that its tip comes into contact with the ground, and detecting the tilting of the tilt link 2 with the detector 71 and actuating the warning means. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a loading / unloading device that is provided at a rear portion or a loading portion side of a cargo vehicle such as a van-type truck, and more particularly to a warning device that warns of this situation when the loading tray is tilted in the middle of lifting / lowering. .
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there have been provided a large number of loading tray lifting / lowering devices in which a loading tray is provided at a rear end portion of a cargo vehicle such that the loading tray can be raised and lowered via a link mechanism.
[0003]
This loading cradle lifting device is configured to be able to move up and down between the highest position where the loading cradle is substantially flush with the loading platform and the lowest descent position where the loading cradle contacts the ground. When it reaches, the operation shifts to the tilting operation, and the tip of the receiving table is grounded on the ground. In addition, at the highest position, the load receiving platform is turned to the loading platform side so as to be in an upright state for storing and traveling (for example, see Patent Document 1).
[0004]
[Patent Document 1]
JP-A-2001-233114
[Problems to be solved by the invention]
By the way, in the above-described conventional loading / unloading device, the loading / unloading platform normally moves up and down while maintaining a horizontal position. In some cases, such as when a load is applied, the tip of the load receiving table may be inclined downward.
[0006]
If the load receiving table is tilted abruptly during the elevating operation, there is a problem that the load may be inadvertently moved on the load receiving table or fall, which is dangerous.
[0007]
SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems. An object of the present invention is to alert a worker of this situation when a loading tray is tilted during a lifting operation to drop a load. An object of the present invention is to provide a warning device for a lifting / lowering device for a loading tray that can perform a highly safe operation by preventing the accident in advance.
[0008]
[Means for Solving the Problems]
The warning device in the loading tray lifting device according to the first aspect of the present invention is configured such that the loading tray is provided between the ground and a loading platform located at a predetermined height from the ground via a link mechanism so as to be able to freely move up and down. In a loading table elevating device in which the table is tilted on the ground so that the tip thereof touches the ground, when the loading table is tilted during the lifting operation, a detector is provided to detect this, The alarm means is activated based on the detection of the detector.
[0009]
In the warning device of the loading tray elevating device according to the second aspect of the present invention, the link mechanism includes a tilt link for tilting the loading tray so that the tip of the loading tray is grounded on the ground, and the tilt is detected by the detector. It is configured to detect the swinging operation of the link and activate the alarm means.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0011]
FIG. 1 to FIG. 4 show a schematic configuration of a loading tray elevating device of the present invention provided in a freight vehicle.
[0012]
In FIG. 1, a loading tray elevating device X is mounted via a support member 10 to a rear portion of a body frame formed of a main frame or the like of the freight vehicle 1. The loading tray lifting device X includes a tilt link 2, a lift arm 3, a tilt cylinder 4, a lifting cylinder 5 (only one of which is shown), and a loading tray 6, which are arranged in pairs on the left and right, respectively.
[0013]
The support member 10 includes a frame member 11 extending below the rear end of the vehicle body frame in the vehicle width direction, a pair of left and right fixed brackets 12 for fixing the frame member 11 to the rear end of the vehicle body frame, And support brackets 13 provided at both left and right positions of the material 11. Each of the support brackets 13 has opposing pieces 13a opposing each other in the vehicle width direction.
[0014]
A carrier 15 is mounted on the vehicle body frame.
[0015]
Each tilt link 2 is formed in a substantially U-shaped cross section that opens to the rear of the vehicle body frame, and extends in the vertical direction. The upper end (proximal end) of the tilt link 2 is located above the opposing piece 13 a of the support bracket 13 via a pin 21. It is rotatably connected, and the lower end side (tip side) swings in the direction of contacting and separating from the support member 10, that is, in the vehicle longitudinal direction. In this case, each tilt link 2 has a storage position (a position shown in FIG. 1) in which the lower end side is stored in a contact state with the frame material 11 in the opposing piece 13a of the support bracket 13, and a rear end of the vehicle body from the opposing piece 13a. It is configured to be mutually converted to a detached position (the position shown in FIG. 3) at which the sheet is detached.
[0016]
Each lift arm 3 extends in the front-rear direction of the vehicle body, and its front end (base end) is rotatably connected to the upper end of the tilt link 2 via a pin 31. The rear end (front end) of each of the lift arms 3 is rotatably connected to upper and lower left and right positions of the load receiving table 6 via pins 32, respectively.
[0017]
Each tilt cylinder 4 is formed of a hydraulic cylinder, and is disposed below the lift arm 3 so as to extend in the vehicle longitudinal direction. The front end of each tilt cylinder 4 is rotatably connected via a pin 41 between a facing piece 13a outside the support bracket 13 and a bracket piece 16 facing the facing piece 13a from outside. I have. On the other hand, the rear end of each tilt cylinder 4 is rotatably connected via a pin 42 to the left and right ends of the lower end portion of the loading tray 6. In this case, each tilt cylinder 4 is laid out below the lift arm 3 at a position diagonally outward.
[0018]
Each of the lift cylinders 5 is composed of a hydraulic cylinder, and extends below the lift arm 3 in the vehicle longitudinal direction. The front end of each of the lift cylinders 5 is rotatably connected to the lower end of the tilt link 2 via a pin 51. The rear end of each of the lift cylinders 5 is rotatably connected via a pin 52 to a distal end of a substantially intermediate portion of the lift arm 3.
[0019]
The load receiving table 6 is moved to the highest position (the position shown in FIG. 1) by moving the lift cylinders 5 to extend to be substantially flush with the load table 15, while contracting each lift cylinder 5. By moving it, it is positioned at the lowest position (the position shown in FIG. 2) where it descends and comes into contact with the ground (ground) G.
[0020]
The loading table 6 has a substantially triangular cross-section when viewed from the side of the vehicle body, and has a mounting surface 61 (upper surface) which is horizontal (a state shown in FIGS. 1 and 2) and a rear end of the mounting surface 61. The state is converted into a downward tilt (tilt) state (the state shown in FIG. 3) where the (tip) is in contact with the ground G.
[0021]
Then, the loading tray 6 is continuously raised by the operation switch so as to cover the mounting surface 61 so as to cover the rear opening of the loading platform 15 from a rearward state where the mounting surface 61 is horizontal at the highest position. It can be converted to a standing state (a state shown in FIG. 4). On the other hand, the loading tray 6 can be changed from a standing state to a falling state at the highest position by a continuous falling operation using an operation switch.
[0022]
Next, the tilt operation and the undulating operation associated with the lifting / lowering operation of the loading tray 6 by the loading tray lifting device X described above will be described. In this case, it is assumed that the receiving table 6 is positioned at the highest position (the position shown in FIG. 1).
[0023]
First, when the lowering switch (not shown) is turned on when lowering the loading tray 6, the pressure oil in the non-rod side chamber (not shown) of each lift cylinder 5 is gradually increased by the action of a load such as the own weight of the loading tray 6. And each lift cylinder 5 starts to contract and move, and each lift cylinder 5, each lift arm around the pin 51 at the front end of each lift cylinder 5, the pin 31 at the front end of each lift arm 3, and the pin 41 at the front end of each tilt cylinder 4. 3 and each tilt cylinder 4 are rotated downward.
[0024]
Thus, the loading tray 6 is lowered by rotating around the pins 52 at the rear ends of the lift cylinders 5 and the pins 32 at the rear ends of the lift arms 3 while being held in a horizontal state. At this time, since the load of the load receiving cradle is applied to each lift cylinder 5 when the lifting and lowering operation of the load receiving pedestal 6 is performed, each tilt link 2 is directed toward the detached position (the position shown in FIG. 3) behind the vehicle body. No force is applied and it is held in the storage position (the position shown in FIG. 1).
[0025]
Thereafter, when the loading tray 6 is positioned at the lowest position (the position shown in FIG. 2) where it comes into contact with the ground G, each tilt link 2 swings backward to the disengaged position (the position shown in FIG. 3), With the pin 42 at the rear end of the tilt cylinder 4 as a fulcrum, the rear end of the load receiving table 6 (the mounting surface 61) is tilted downward and automatically converted to a tilt state (the state shown in FIG. 3).
[0026]
In this case, the conversion of the loading tray 6 into the tilted state is performed by applying a downward load to the rear end of the loading tray 6 when the front end of the lower surface of the loading tray 6 descending while maintaining the horizontal state first contacts the ground G. It is done by doing. In other words, the pins 32 at the rear ends of the lift arms 3 are moved rearward of the vehicle body while the lift cylinders 5 are further contracted from the contact position of the load receiving table 6 by the load at the contact position of the load receiving table 6 to tilt each tilt link 2. This is because the state is converted to a state, whereby the rear end of the load receiving table 6 is tilted downward with the pin 42 at the rear end of the tilt cylinder 4 as a fulcrum.
[0027]
As described above, when the loading tray 6 is lowered to the contact position where the loading tray 6 contacts the ground G, each tilt link 2 automatically swings rearward of the vehicle body to the disengagement position due to a rotational moment of the pin 42 of the loading tray 6 or the like. The pin 32 at the rear end of the lift arm 3 also moves to the rear of the vehicle body in accordance with the swing of each tilt link 2, and the rear end of the loading table 6 is automatically moved downward with the pin 42 at the rear end of the tilt cylinder 4 as a fulcrum. Tilt can be performed, and loading and unloading of luggage can be performed smoothly.
[0028]
On the other hand, when the lift switch (not shown) is turned on to raise the tilted load receiving table 6 from the ground position, pressurized oil is supplied into the non-rod side chambers (not shown) of each lift cylinder 5 to lift each lift cylinder. The cylinder 5 starts to extend and the rear end of the load receiving table 6 is tilted upward with the pin 42 at the rear end of the tilt cylinder 4 as a fulcrum, and is converted into a horizontal state, whereby the load receiving table 6 is moved to the lowest position (load receiving table). 6 where only the front end of the lower surface is in contact with the ground G).
[0029]
Then, by the extension movement of each lift cylinder 5 performed continuously as it is, each lift cylinder 5 around the pin 51 at the front end of each lift cylinder 5, the pin 31 at the front end of each lift arm 3, and the pin 41 at the front end of each tilt cylinder 4, Each lift arm 3 and each tilt cylinder 4 are rotated upward. As a result, the load receiving table 6 is raised by the rotation of the pins 52 at the rear end of each lift cylinder 5 and the pin 32 at the rear end of each lift arm 3 while being held in a horizontal state, and is substantially flush with the load table 15. In the highest position.
[0030]
When the loading stand 6 is erected at the highest position, pressure oil is supplied into the opposite rod side chamber (not shown) of each tilt cylinder 4 so that each tilt cylinder 4 starts to extend and move. The rear end of the load receiving table 6 rotates upward with the pin 32 at the rear end of the lift arm 3 as a fulcrum, and converts the load receiving table 6 from the elevating operation state (horizontal state) to the standing state (state shown in FIG. 4). . As described above, since the respective tilt cylinders 4 are extended and moved at the highest position to extend and rotate the load receiving table 6 around the pins 32 at the rear end of the lift arm 3, the load receiving table 6 is raised. The raising and lowering operation of the platform 6 can be easily performed by the extension movement of each tilt cylinder 4, and can be used as an opening / closing door that covers the rear opening of the cargo platform 15 of the freight vehicle 1 from the rear by raising the cargo receiving platform 6. Can be.
[0031]
Further, in order to convert the load receiving table 6 from the standing state to the elevating operation state, when the tilting operation is performed, the pressure oil in the rod side chamber (not shown) of each tilt cylinder 4 is actuated by the action of a load such as the own weight of the load receiving table 6. After being discharged, each tilt cylinder 4 contracts and moves, whereby the loading tray 6 is converted into an elevating operation state by an operation reverse to the above.
[0032]
By the way, the loading cradle lifting / lowering device X configured as described above is provided with a warning device 7 (see FIG. 5) for warning when the loading cradle 6 is inclined at the time of lifting / lowering.
[0033]
The warning device 7 includes a detector 71 that detects the swing of the tilt link 2 toward the disengagement position as shown in FIG. The detector 71 is provided on the bottom of the frame member 11 via a bracket 11 a so as to face the lower end of the tilt link 2.
[0034]
As the detector 71, for example, a proximity switch or the like is used. For example, when the tilt link 2 is turned off in a state where the tilt link 2 is located at the storage position, the tilt link 2 swings to the disengagement position side to be in a separated state. The circuit is configured to be turned on, and when the detector 71 is turned on, the alarm means is activated to warn an operator or the like.
[0035]
In other words, if the leading end (rear end) of the load receiving table 6 is inclined during the elevating operation, the tilt link 2 always swings from the storage position to the detached position side as shown in FIG. By detecting the swing of the tilt link 2 by the detector 71, it is possible to indirectly detect that the inclination of the load receiving table 6 has occurred.
[0036]
The alarm means is, for example, a buzzer or a lamp, and informs an operator of the situation by sounding a buzzer or lighting a lamp.
[0037]
As described above, when the loading tray 6 is tilted during the elevating operation, the warning means is activated to warn the worker of the situation and call attention, so that the cargo is accidentally moved or the cargo is dropped. Can be prevented beforehand, and safe work can be performed.
[0038]
Further, in the warning device 7 configured as described above, the warning means is similarly activated when the loading tray 6 is grounded on the ground and the tilting operation is performed, but the loading tray 6 is moved to the normal tilt operation to the worker. It is preferable from the viewpoint of safety, because the warning of the worker can be brought out by giving a warning even when the operation is performed. In addition, when the loading tray 6 is performing a normal tilt operation on the ground, the detection by the detector 71 may be invalidated and the warning device 7 may not be operated.
[0039]
In the present embodiment, the proximity switch is described as an example of the detector 71. However, the detector 71 is not limited to the proximity switch, and can detect the swing state of the tilt link 2 such as a photoelectric switch or a limit switch. Anything should do.
[0040]
Further, the loading / unloading device elevating device X is not limited to the device provided in the cargo vehicle as in the present embodiment, but is a facility for unloading cargoes between the ground and a loading platform located at a predetermined height from the ground. And so on.
[0041]
【The invention's effect】
As described above, according to the warning device in the loading tray elevating device of the present invention, when the loading tray is tilted during the elevating operation, the detector that detects this is provided, and an alarm is issued based on the detection of the detector. By operating the means, if the loading tray tilts during the elevating operation, the alarm means can be activated to warn the worker of the situation and call attention, which causes the cargo to move carelessly Accidents such as dropping or falling of cargo can be prevented, and safe work can be performed.
[Brief description of the drawings]
FIG. 1 is a side view showing a schematic configuration of a loading tray elevating device in which a loading tray is in a down state at a highest position.
FIG. 2 is a side view showing a schematic configuration of a loading tray lifting device in which the loading tray is in a lifting operation at a lowermost position.
FIG. 3 is a side view showing a schematic configuration of a loading tray elevating device in which the loading tray is tilted at a lowermost position.
FIG. 4 is a side view showing a schematic configuration of a loading tray elevating device in which the loading tray is in an upright state at a highest position.
FIG. 5 is a side view showing the warning device.
FIG. 6 is a side view showing an abnormal state in which an inclination is generated in the load receiving tray and the warning device operates.
[Explanation of symbols]
DESCRIPTION OF REFERENCE NUMERALS 1 freight vehicle 15 carrier 2 tilt link 6 carrier 7 warning device 71 detector G ground (ground)
X Loading platform lifting device

Claims (2)

A loading platform is provided between the ground and the loading platform located at a predetermined height from the ground via a link mechanism so as to be able to move up and down, and the loading platform is tilted on the ground so that the tip of the loading platform contacts the ground. In the loading platform lifting device adapted to
A detector for detecting when the receiving table is tilted during the elevating operation is provided, and a warning means is activated based on the detection of the detector. Warning device. The link mechanism is provided with a tilt link for tilting the receiving table on the ground so that the tip end thereof is in contact with the ground. The warning device in the loading tray lifting device according to claim 1, wherein the warning device is configured.

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