JP2011195334A - Safety device of forklift - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safety device of a forklift capable of preventing a fork from colliding with a front obstacle.SOLUTION: This safety device includes a lifting bracket 5 installed on a fork fixing bracket 2b so as to be protrusible-retreatable downward, a noncontact measuring apparatus 6 installed in a position capable of measuring the obstacle 4b existing in front of a lower end part between the forks 2a in a state of projecting this lifting bracket 5, a protruding-retreating mechanism 7 for retreating the lifting bracket 5 to a degree of not contacting the noncontact measuring apparatus 6 with a floor when the fork 2a descends, while projecting the lifting bracket 5 by the predetermined length downward from the fork fixing bracket 2b when the fork 2a lifts, and a notifying means 8 arranged in a position confirmable from an operation seat and notifying the front obstacle 4b measured by the noncontact measuring apparatus 6.

Description

  The present invention relates to a safety device for a forklift.

Conventionally, forklifts have been used for shipping arrangements at shipping sites. In other words, forklifts are used to load and store packages in three to four stages according to type and store them in order to load them onto a transport vehicle such as a trailer.

Further, Patent Document 1 describes that the distance to an obstacle such as an object or a person is measured using a sensor attached near the base of the fork, and the forward function of the forklift is braked at a preset distance. This prevents the tip of the forklift from contacting the obstacle. This sensor prevents the fork from colliding with an object or person.
Measure obstacles at the same height as the fork or slightly higher than the fork. In the forklift constructed as described above, since the forward movement of the forklift is suppressed when there is an obstacle in front of the fork, it is possible to prevent an accident from occurring.

By the way, as shown in FIG. 9, when the packages 90 are arranged using a forklift at the shipping place, if the products of the packages 90 a, 90 b, 90 c, and 90 d are misaligned, there is a possibility that the cargo collapses. There is a problem. Such positional deviation is caused by the difference Dh between the heights Ha and Hb of the luggage 90a and 90b. In addition, the loads 90a and 90b in which the positional deviation has occurred may cause the collapse of the load during traveling when they are loaded on a transport vehicle such as a trailer.

For this reason, as shown in FIG. 10, the operator can move the packages 90a to 90d in which the products are misaligned.
The forklift 91 is used to unload the goods 90a to 90d and lift the luggage 90a to 90d again and stack them on the upper stage of the luggage 90a to 90d. The luggage 90e is blocked by the luggage 90e, the front luggage 90a cannot be confirmed, and a fork claw or pallet or the like touches the product 90a on the front and damages the product 90a while moving the luggage 90e on a tall shelf. Inconvenience may occur.

Therefore, the transporter who operates the forklift 91 gets over the vehicle body and moves forward the forklift 91 while checking the front to stack the loads on the upper stage. At this time, the operator should be careful not to throw it out of the vehicle body, and operate with the body out of the vehicle body, so that the operation of the pedal operation such as steering wheel operation, accelerator, brake, etc. will not be stable. It is possible to induce.

Alternatively, when the worker performs a cargo handling operation, the auxiliary worker is accompanied by another auxiliary worker, and the auxiliary worker monitors the luggage so that it is stacked straight so as not to easily collapse. Similarly, when carrying out the cargo handling work, an auxiliary worker attaches to carry out the work of stacking the luggage on the upper stage according to the instruction of the auxiliary worker.

JP 2006-16202 A

However, by placing an auxiliary worker for each cargo handling work, a lot of manpower is required for the work, which causes a problem of increasing costs. In addition, in the case of a forklift, the fork may move forward with the fork positioned at the bottom of the floor, so it is difficult to detect obstacles by placing sensors on the lower surface of the fork. Obstacles could only be detected at the same height as the top or pallet top or fork.

For this reason, obstacles cannot be detected when a pallet or a load is placed on the fork, and the problem of poor visibility during loading work with the load placed on the fork has not been solved.

The present invention has been made in consideration of the above-mentioned matters, and the forklift provides a safety device for a forklift by checking the presence or absence of an obstacle in front of the lower surface of the fork with the load placed on the fork. This is the issue.

In order to solve the above problems, the first invention is a lifting bracket attached to a fork fixing bracket so as to be able to be retracted downward, and an obstacle in front of a lower end portion between the forks in a state in which the lifting bracket is projected. A non-contact measuring instrument mounted at a position where the fork can be measured, and when the fork is raised, the lifting bracket protrudes downward from the fork fixing bracket by a predetermined length, while the non-contact measuring instrument is lowered when the fork is lowered. A retracting mechanism for retracting the lifting bracket so as not to contact the floor; and a notification means that is installed at a position that can be confirmed from the driver's seat and that notifies a front obstacle measured by the non-contact measuring device. A forklift safety device is provided (claim 1).

The second invention comprises an elevating bracket attached to the fork fixing bracket so as to be retractable,
A non-contact measuring device mounted at a position where an obstacle in front of the lower end portion of each fork can be measured in a state where the lifting bracket is projected, and the lifting bracket is removed from the fork fixing bracket when the fork is raised. It is installed at a position where it can be confirmed from the driver's seat, and an exit / retreat mechanism for retracting the lifting bracket so that the non-contact measuring device does not contact the floor while the fork is lowered while projecting downward by a predetermined length. A forklift safety device is provided, characterized by comprising a notification means for notifying a front obstacle measured by a contact measuring instrument (claim 2).

Since the lifting bracket shown in claims 1 and 2 is attached to the bottom of the fork fixing bracket so as to be retractable by a retracting mechanism, the non-contact measuring device provided on the lifting bracket is a fork between forklifts. Obstacles ahead can be measured with a non-contact measuring instrument. Further, when the fork is raised, the elevating bracket projects the elevating bracket downward from the fork fixing bracket by a predetermined length, while the elevating bracket does not contact the floor when the fork is lowered. Therefore, the non-contact measuring device attached to the lifting bracket does not collide with the floor surface. The advancing / retracting mechanism may use a cylinder that retracts the lifting bracket only when the fork is positioned at the lower end in accordance with the operation of the fork. Since the notification means notifies a front obstacle measured by the non-contact measuring device at a position that can be confirmed from the driver's seat, the operator can check the presence or absence of the obstacle using the notification means.

Therefore, even if the worker's field of view may be obstructed by the package being transported, when the tip of the fork or the tip of the pallet is likely to collide with the obstacle, this can be confirmed by the notification means. Therefore, it is not necessary for the worker to perform a dangerous operation such as getting out of the forklift in order to confirm an obstacle ahead, and no auxiliary worker is required.

As shown in claim 1, when the non-contact measuring device is provided at the lower end portion between the forks, it is possible to measure the obstacle in front of the forklift in a balanced manner with a simple configuration. On the other hand, as shown in claim 2, the obstacle in front of the lower end portion of each fork is measured by each non-contact measuring device, and any one non-contact measuring device measures the obstacle in front of the fork. When the notification means is sometimes configured to notify an obstacle, contact between the load and the fork can be avoided more reliably.

The retracting mechanism is configured such that one end is fixed to the forklift vehicle body, the other end is fixed to the lifting bracket, and the lifting bracket is suspended from the lifting body and is pivotally attached to the inner mast so as to hang the rope. The first pulley and the inner mast are pivotally attached so that the rope is bent and pulled so that the lifting bracket does not hit the floor surface with the fork positioned at the lower end. In the case of including a second pulley that abuts and a measuring device position confirmation switch that is attached to the lower side of the lifting bracket and that enables the non-contact measuring device only in the protruding state of the lifting bracket (Claim 3), Since the lifting bracket is suspended by the rope wound around the first pulley attached to the inner mast, the height of the fork and the lifting bracket The combined location, it is possible to move the lift bracket vertically to follow the height position of the fork. That is, when the fork is raised, the obstacle can be measured in a state where the non-contact measuring device is fixed at a relative position where the non-contact measuring device protrudes from the lower surface of the fork fixing bracket.

In addition, when the fork is in the lowest position, the lifting pulley moves back into the fork rail fixing bracket because the second pulley comes into contact with the rope body to such an extent that it pulls the cable body, so that the non-contact measuring instrument also enters the fork rail fixing bracket. A gap is generated between the floor surface and the non-contact measuring device. That is, the non-contact measuring device does not collide with the floor surface. The cord is preferably a wire, but may be a chain or rope. Moreover, when the rope is a chain, the pulley may be a sprocket.

When the non-contact measuring device is a light detection sensor that measures distance using light (Claim 4), the distance is measured using light that does not diffuse, so that more accurate distance measurement can be performed. And reliability is improved. In addition, it is preferable that the light detection sensor has a simple configuration that measures a distance using a single ray like a photoelectric sensor, but this photosensor measures a multipoint distance using a plurality of rays. It may be. Further, it may be an object that measures reflected light accompanying light irradiation, or an object that measures radiated light such as infrared light. When the light detection sensor detects an obstacle at a distance likely to come into contact with the fork in consideration of the length of the fork, a warning is issued using the notification means.

When the non-contact measuring instrument is an ultrasonic detection sensor that measures a distance using ultrasonic waves (Claim 5), the distance in a predetermined region may be measured using ultrasonic waves. Since some diffusion occurs in the ultrasonic wave, it is possible to measure the presence or absence of an obstacle in a predetermined area. By adjusting this area, an obstacle in front of the forklift can be detected appropriately. When the ultrasonic detection sensor detects an obstacle at a distance likely to come into contact with the fork in consideration of the length of the fork, a warning is issued using the notification means.

Note that a light detection sensor and an ultrasonic detection sensor may be used in combination as the non-contact measuring device.

When the non-contact measuring device includes a camera that images the vicinity of the tip of the fork (Claim 6), an obstacle in front can be confirmed by an image obtained by imaging the front from the lower end of the fork. Note that the image captured by the camera is a two-dimensional detection of the light reflected by the obstacle, but the image is captured by detecting the reflected light by irradiating infrared light or the like from the camera side. Even if it exists, you may image using the far infrared rays radiated | emitted from an obstruction. The captured image can be displayed on a monitor as notification means. A signal processing circuit that analyzes the captured image and determines that there is an obstacle that may collide forward,
A warning may be output from the notification means when it is determined by the signal processing circuit that there is an obstacle. The camera may be attached together with the light detection sensor and the ultrasonic detection sensor.

When the notification means includes a sounding device such as a display device, a buzzer, or a speakerphone (Claim 7), a notification when there is an obstacle in front of the fork is notified by a warning sound (melody) and / or warning sound. As a result, the operator can check the presence or absence of an obstacle without moving his eyes from the operation of the forklift, so the work efficiency is good.

In the case where the notification means includes a display device such as a display for displaying a warning or a warning lamp (Claim 8), the state of the obstacle can be visually confirmed, so the certainty increases. In particular, when the display device is a display, an obstacle can be confirmed as if the operator is looking through the lower end of the forklift.

As described above, according to the present invention, a non-contact measuring device for confirming the presence or absence of an obstruction (baggage) in front of the fork is attached in a state where the fork lift protrudes from the lower end of the fork lift. You can check the presence or absence of objects. In addition, the forklift operator can check the information on the confirmation device at the driver's seat and confirm the presence or absence of obstacles in front of the driver's seat.

At the descending end of the fork (claw), a confirmation device for confirming obstacles is stored in the fork and has a retreat function. When the fork is raised, a confirmation device appears at the bottom of the fork, so that an obstacle can be confirmed, and safety is improved accordingly.

It is a figure explaining the whole structure and operation | movement of a forklift which attached the safety device of the forklift of this invention. It is a figure explaining the structure of the safety device of the forklift which concerns on 1st Embodiment. It is a figure explaining operation | movement of the safety device of the said forklift. It is another figure explaining operation | movement of the safety device of the said forklift. It is a figure which shows the structure of the safety device of the forklift which concerns on 2nd Embodiment. It is a figure which shows the structure of the safety device of the forklift which concerns on 3rd Embodiment. It is a figure explaining the whole structure and operation | movement of a forklift which attached the safety device of the forklift which concerns on 4th Embodiment. It is a figure which shows the structure of the safety device of the forklift shown in FIG. It is a figure which shows the example of the load sorted by a forklift. It is a figure which shows the whole structure of the conventional forklift.

Hereinafter, the forklift safety device 1 according to the first embodiment of the present invention will be described with reference to FIGS.
The configuration and operation will be described. FIG. 1 shows a configuration of a forklift 2 to which a forklift safety device 1 according to the present invention is attached. This forklift 2 is loaded with loads 4a and 4 placed on a pallet 3.
b and 4c are conveyed and stacked.

As shown in FIGS. 2 to 4, the forklift safety device 1 of the first embodiment is a fork 2a.
The lifting bracket 5 is attached to the fixing bracket 2b so as to be able to be retracted downward, and the obstacle in front of the lower end portion between the forks 2a can be measured in a state where the lifting bracket 5 is projected. The photoelectric sensor 6 as an example of a non-contact measuring device, and when the fork 2a is raised, the elevating bracket 5 protrudes downward from the fork fixing bracket 2b by a predetermined length, while the fork 2a is lowered when the photoelectric sensor 6 is lowered. An exit / retreat mechanism 7 (represented only in FIGS. 3 and 4) for retracting the elevating bracket 5 to such an extent that the sensor 6 does not contact the floor and a non-contact measuring instrument installed at a position that can be confirmed from the driver's seat. A horn type speaker 8a as an example of a notification means for notifying an obstacle ahead, an alarm lamp 8b as an example of a display device, And a part 9.

The forklift 2 has an inner mast 2c that slidably holds the fork fixing bracket 2b, and an outer mast 2d that slidably holds the inner mast 2c. The outer mast 2d can be tilted to the vehicle body 2e. Installed on. The outer mast 2d, the inner mast 2c, and the fork fixing bracket 2b are interlocked by a chain or the like.

The elevating bracket 5 can be switched between two states: a state in which it is projected below the fork fixing bracket 2b and a state in which it is retracted so as to be housed in the fork fixing bracket 2b. The fork fixing bracket 2b is slidable in the vertical direction. Reference numeral 5a denotes a measuring instrument position confirmation switch such as a limit switch for detecting whether or not the elevating bracket 5 protrudes downward from the fork fixing bracket 2b. A signal indicating whether or not the lifting bracket 5 is in a state of projecting downward from the fork fixing bracket 2 b is sent to the control unit 9.

The photoelectric sensor 6 is attached to the lower end portion of the elevating bracket 5, and the fork 2
In the state where b is raised, the laser beam B is irradiated straight forward between the two forks in a state where it protrudes below the fork 2b (see FIGS. 1 and 4), and the reflected light is used. The distance L0 to the obstacle (the luggage 4b) is measured. Further, the photoelectric sensor 6 has a measured distance L0.
Is output to the control unit 9 in the form of an electric signal.

As shown in FIGS. 3 and 4, the retracting mechanism 7 has, for example, a vehicle body 2 e with one end of the forklift 2,
The other end is fixed to the elevating bracket 5 and the wire 10 as an example of a cable body that suspends the elevating bracket 5 and a second structure that is rotatably attached to the inner mast 2c and is configured to hang the cable body. 1 pulley 11 and a wire 10 that is pivotably attached to the inner mast 2c so that the elevating bracket 5 and the photoelectric sensor 6 are lifted from the floor FL by a height h1 with the fork 2a positioned at the lower end. The second pulley 12 that contacts the wire 10 to the extent that it is bent and pulled, and the forklift main body 2e is rotated so that the fork 2a is positioned at a height h2 higher than the first pulley 11 with the fork 2a positioned at the lower end. And a first pulley 13 that is freely attached.

Further, the positional relationship of the pulleys 11 to 13 with the fork 2a positioned at the lowermost end is such that the upper end of the third pulley 13 with respect to the upper end of the first pulley 11 (if the third pulley 13 is omitted, the main body 2e) is a position where the height of the first pulley 11 is increased by the height h2.
The lower end of the second pulley 12 with respect to the upper end is attached at a position where it is lowered by the height h3.
In this case, in a state where the fork 2a is positioned at the lowermost end, the wire 10 is at least represented by the formula (1
It is possible to pull by the length Lh shown in FIG.

  Lh = h3 × 2 + h2 Formula (1)

The horn type speaker 8a is attached at a position where it can be easily heard by a driver operator of the forklift 2, and in this embodiment, the horn type speaker 8a is attached on an unobstructed roof. Also,
The alarm lamp 8a is attached to a position that is conspicuous to the driver's eyes, and is attached to the front protective frame in this embodiment. In addition, although the sound generated from the horn type speaker 8a can be reduced to an uncomfortable feeling by making it a melody, it may be a sound having a warning meaning such as a buzzer sound, a siren or a voice. That is, the sound generation device may be a buzzer as well as a speaker. Similarly, although an example in which the display device is an alarm lamp is shown, a display device such as a display for displaying an alarm message may be used.

The control unit 9 detects the protruding state of the photoelectric sensor 6 by the measuring device position confirmation switch 5a, and the distance L0 measured by the photoelectric sensor 6 is the distance L1 for ensuring safety to the length L1 of the fork 2a.
When the value is smaller than the value obtained by adding (optional), it is determined that there is an obstacle ahead, and the horn type speaker 8
The alarm lamp 8a is turned on at the same time as generating a warning sound melody in a, which can be easily formed using a relay circuit or the like, but may be formed using a PLC or a microcomputer.

The wire 10 is preferable because it has sufficient strength to suspend the lifting bracket 5 and the like and flexibility to bend along the pulleys 11 to 13, but a rope or chain may be used instead of the wire. Needless to say.

The forklift safety device 1 configured as described above is provided with the above-described retracting mechanism 7 so that the wire 10 in the state where the fork 2a is disposed at the lowermost end as shown in FIG.
Since the second pulley 12 comes into contact with the wire 10 and the wire 10 is bent in a substantially M shape in the drawing, the wire 1
0 can be pulled at least by the length Lh, and the photoelectric sensor 6 is moved from the floor surface FL to the height h1.
Can only float. At this time, since the measuring instrument position confirmation switch 5a detects that the photoelectric sensor 6 is in the retracted state, the control unit 9 does not wastefully output an alarm.

Further, as shown in FIG. 4, when the fork 2a is raised, the second pulley 12 does not bend the wire 10, so that the photoelectric sensor 6 can protrude from the lower end of the fork 2a. Since the photoelectric sensor 6 protruding from the lower end of the fork 2a is suspended by a wire 10 wound around a first pulley 11 rotatably attached to the inner mast 2c, the photoelectric sensor 6 follows the vertical movement of the fork 2a. By moving in the vertical direction, the relative position of the photoelectric sensor 6 with respect to the fork 2a can be fixed. Therefore, the photoelectric sensor 6 can always confirm that there is no obstacle ahead in the lower end portion of the fork 2a.

At this time, the position of the laser beam B irradiated from the photoelectric sensor 6 is preferably slightly lower than the lower end of the pallet 3 into which the fork 2a is inserted. As a result, the operator can confirm the situation in which the lower end of the pallet 3 is likely to come into contact with an obstacle such as the front luggage 4a, 4b by lighting the alarm melody of the horn type speaker 8a and the alarm lamp 8b. Even if the fork 2a and the pallet 3 cannot be visually confirmed by the load 4c (see FIG. 1), the contact that causes the collapse of the load can be avoided.

That is, when the photoelectric sensor 6 detects a front obstacle, an alarm melody flows from the horn type speaker and an alarm lamp is lit, so that the operator moves forward after confirming that the alarm is stopped by raising the fork 2a slightly. The luggage 4c can be stacked.

According to the forklift safety device 1 of the present invention, safety confirmation can be performed in a state in which the load 4c is placed on the fork 2a, which was not possible with the conventional device, which is extremely useful.

FIG. 5 is a view showing a forklift safety device 1a according to the second embodiment, which is a modification of the first embodiment. In the following description, members described using the same reference numerals as those in FIGS. 1 to 4 are the same or equivalent members, and thus detailed description of the configuration is omitted.

As shown in FIG. 5, the non-contact measuring device attached to the raising / lowering bracket 5 may be the ultrasonic detection sensor 6a. This ultrasonic detection sensor 6a is between the forks 2a in plan view,
The ultrasonic wave W is irradiated on the lower side of the fork 2a, and an obstacle ahead is detected using the ultrasonic wave reflected by the luggage 4b and the like.

By using the ultrasonic detection sensor 6a as in the present embodiment, the detection area can be widened, and an obstacle in front of the forks 2a on both sides is detected by one ultrasonic detection sensor 6.
It can be detected by a. That is, sufficient safety can be ensured with the simplest possible configuration.

FIG. 6 shows a safety device 1 for a forklift according to a third embodiment, which is a modification of the first and second embodiments.
It is a figure which shows b. In the following description, members described using the same reference numerals as those in FIGS. 1 to 5 are the same or equivalent members, and thus detailed description of the configuration is omitted.

As shown in FIG. 5, the non-contact measuring devices attached to the lifting bracket 5 are photoelectric sensors 6b and 6c arranged at the lower end portions of the left and right forks 2a according to the position of the forks 2a.
It may be. The photoelectric sensors 6b and 6c detect a front obstacle by irradiating a laser beam B on the extension line of the fork 2a in plan view. The control unit 9 outputs an alarm when one of the photoelectric sensors 6b and 6c detects an obstacle. Obstacle detection accuracy is improved and reliability is excellent.

7 and 8 are views showing a forklift safety device 1c according to a fourth embodiment of the present invention. Also, in the description of FIGS. 7 and 8, the members described using the same reference numerals as those in FIGS. 1 to 6 are the same or equivalent members, and thus detailed description of the configuration is omitted.

The forklift safety device 1c according to the fourth embodiment has a camera 6 as an example of a non-contact measuring device at a position between the bottom end of the lifting bracket 5 and the base end of the fork 2a in plan view.
The second embodiment is different from the first to third embodiments in that e is provided and a monitor 8c is provided as a display device that displays an image captured by the camera 6e as an example of a notification unit.

The camera 6e captures an image having an imaging range A from the lower end of the fork 2a that is difficult for the operator to reach. The control unit 9 includes a signal processing device such as a microcomputer and is captured by the camera 6e. The horn type speaker 8a is used to output an alarm sound when a state where there is an obstacle ahead is detected by analyzing the image using the obtained image. When the horn type speaker 8a is omitted, the control unit 9 may be a relay circuit.

By configuring as in the present embodiment, a portion that becomes a blind spot for the operator is monitored 8c.
Therefore, it is possible to ensure sufficient safety while having an extremely simple configuration.

DESCRIPTION OF SYMBOLS 1,1a-1c Forklift safety device 2 Forklift 2a Fork 2b Fork fixing bracket 5 Lifting bracket 5a Measuring device position confirmation switch 6, 6a-6e Non-contact measuring device 7 Retracting mechanism 8a-8c Notification means 10 Rook 11 1 pulley 12 2nd pulley

Claims (8)

A lifting bracket attached to the fork fixing bracket so as to be able to be withdrawn downward;
A non-contact measuring instrument attached at a position where an obstacle in front of the lower end portion between the forks can be measured in a state in which the lifting bracket is projected;
When the fork is raised, the elevating bracket protrudes downward from the fork fixing bracket by a predetermined length, and when the fork is lowered, the elevating / retracting mechanism retracts the elevating bracket so that the non-contact measuring instrument does not contact the floor. When,
A forklift safety device comprising: a notification unit that is installed at a position that can be confirmed from a driver's seat and that notifies a front obstacle measured by the non-contact measuring device. An elevating bracket attached to the fork fixing bracket so as to be able to move in and out;
A non-contact measuring instrument attached at a position where each obstacle can be measured in front of the lower end portion of each fork in a state in which the lifting bracket is projected;
When the fork is raised, the elevating bracket protrudes downward from the fork fixing bracket by a predetermined length, and when the fork is lowered, the elevating / retracting mechanism retracts the elevating bracket so that the non-contact measuring instrument does not contact the floor. When,
A forklift safety device comprising: a notification unit that is installed at a position that can be confirmed from a driver's seat and that notifies a front obstacle measured by the non-contact measuring device. The retracting mechanism is configured such that one end is a forklift vehicle body, the other end is fixed to the elevating bracket and the elevating bracket is suspended, and the elevating bracket is pivotally attached to an inner mast and is hooked on the rope. The first pulley and the inner mast are pivotally attached so that the rope is bent and pulled so that the lifting bracket does not hit the floor surface with the fork positioned at the lower end. 3. A second pulley that abuts, and a measuring instrument position confirmation switch that is attached to the lower side of the elevating bracket and that enables the non-contact measuring instrument only when the elevating bracket protrudes. Forklift safety device. The non-contact measuring device is a light detection sensor that measures a distance using light.
The forklift safety device according to any one of the above. The non-contact measuring instrument is an ultrasonic detection sensor that measures a distance using ultrasonic waves.
The forklift safety device according to claim 3. The said non-contact measuring device is provided with the camera which images the fork front-end | tip part vicinity.
The forklift safety device according to any one of the above. The forklift safety device according to any one of claims 1 to 6, wherein the notification means includes a sounding device such as a display device, a buzzer, and a speakerphone. The forklift safety device according to any one of claims 1 to 7, wherein the notification means includes a display device such as a display for displaying a warning and a warning lamp.

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