JP2004075337A - Forklift with lift remote controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a forklift with a lift remote controller capable of preventing a cargo from being taken out while a safety guard is at a use position. <P>SOLUTION: When it is detected that the safety guard 9 is at the use position by safety guard position detection means 16, 17 detecting a position of the safety guard 9, a control circuit body 13 stops a motor 18 and a motor 19 for hydraulic pump to prevent a cargo from being taken out. When the safety guard 9 is at the use position, caution is given to an operator so that running operation and reach operation are not performed while the safety guard 9 is at the use position by lighting or flickering of an alarm means 21. When the operator performs the running operation and the reach operation, a condition in which a cargo is not taken out is realized, and an alarm means 22 composed of an alarm device is operated. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a forklift with a lift remote controller.
[0002]
[Prior art]
As shown in the side view of FIG. 4, the reach type forklift has a mast 102 supported at a front portion of a vehicle body 101 so as to be able to move forward and backward, and a lift bar 103 supported by the mast 102 so as to be able to move up and down. A structure is provided in which a fork 105 is suspended so as to be tiltable, and a backrest 106 is fixed above the tilt bar 104.
[0003]
The reach cylinder for moving the mast 102 is operated by a lever for controlling the reach of the cab, and the lift cylinder 107 for moving the lift bracket 103 up and down is operated by the lever for controlling the lift of the cab. The tilt cylinder for tilting the fork 105, the backrest 106, and the backrest 106 is operated by operating the tilt control lever of the driver's cab to extend and contract, respectively.
[0004]
For example, when the reach control lever is tilted forward, the reach switch is turned on, the position of the direction switching valve is switched to the position A, and hydraulic oil is supplied to and discharged from the reach cylinder in a direction to extend the reach cylinder. The cylinder extends.
[0005]
When the reach control lever is tilted backward, the reach switch is turned on, the position of the direction switching valve is switched to the position B, and hydraulic oil is supplied to and discharged from the reach cylinder in a direction to shorten the reach cylinder. Shorten.
[0006]
When the reach control lever is released, the reach control switch returns to the neutral position, the reach switch is turned off, the direction switching valve is located at the neutral position, the reach cylinder is hydraulically locked, and the reach cylinder is stopped from expanding and contracting.
[0007]
By the way, in addition to this general configuration, for example, the backrest 106 supports a remote controller (hereinafter, referred to as a lift remote controller) 108 for lift control, and the operator rides on the pallet 109 inserted into the fork 105 to lift the lift. There is a so-called forklift with a lift remote control that can control the cylinder 107.
[0008]
In this forklift with a lift remote controller, the backrest 107 supports the left and right safety guards 110, and when the operator operates the lift remote controller 108, the safety guard 110 is positioned at the use position where the operator is laid forward, thereby preventing the operator from falling down. I try to prevent it.
[0009]
When the operator operates the forklift on the cab, the safety guard 110 is stored in an unused position overlapping the backrest 106 as viewed from the side so that the safety guard 110 does not hinder the loading.
[0010]
[Problems to be solved by the invention]
By the way, since the operation of raising the safety guard 110 from the use position to the non-use position depends on the manual operation of the operator, unloading is started while the safety guard 110 is kept in the use position, and the cargo is abutted by the safety guard 110. This can lead to damage or collapse of the cargo.
[0011]
SUMMARY OF THE INVENTION The present invention solves the problem of the prior art, and provides a warning for an unloading operation to an operator when a safety guard is located at a use position or a forklift with a lift remote control that can prevent unloading. For the purpose of providing.
[0012]
[Means for Solving the Problems]
In order to achieve this object, a first forklift with a lift remote controller according to the present invention (hereinafter referred to as the first invention) is a lift remote controller for lifting and lowering a fork on a pallet supported by the fork. And a safety remote control for preventing the operator riding on the pallet from falling down, a forklift with a lift remote control, a position detection switch for detecting the position of the safety guard, and the position detection switch moves the safety guard over the fork. An alarm means for issuing a caution alarm when detecting that the apparatus is located at a use position protruding from the apparatus is provided.
[0013]
According to the first aspect of the invention, if the safety guard is located at the use position, the warning means can give a warning to the operator in advance for taking care of the cargo with the safety guard still being issued.
[0014]
This cautionary alert needs to be given to the operator at the cab for unloading and is sufficient to give to the operator at the cab. Therefore, alarms, such as alarms, musical sounds, and voices, which can be sensed unconsciously by the surrounding people, are undesirable because they cause noise to the surroundings, and do not affect the surroundings such as lighting or blinking of the alarm mark on the indicator panel. It is preferable to employ alarm means for issuing a warning.
[0015]
Next, another forklift with a lift remote controller according to the present invention (hereinafter referred to as the second invention) is a lift remote for lifting and lowering the fork on a pallet supported by the fork in order to achieve the above object. In a forklift with a lift remote controller including a controller and a safety guard for preventing an operator riding on the pallet from falling, a position detection switch for detecting a position of the safety guard, and a traveling operation detection for detecting a traveling operation of the forklift. Means, and warning means for issuing a dangerous driving warning when a driving operation is detected by the driving operation detecting means when the position detection switch detects that the safety guard is projected above the fork. It is characterized by the following.
[0016]
According to the second aspect of the present invention, when the safety guard is located at the use position and the traveling operation is performed, the danger warning that the traveling is a dangerous traveling that may cause damage to the cargo or collapse of the cargo is issued to the operator. Given to.
[0017]
This danger warning is preferably given not only to the operator operating the forklift, but also to workers working around the forklift, so as to encourage evacuation behavior against collapse of the load. Therefore, it is preferable that the danger warning is a warning such as a warning sound, a musical sound, and a sound that can be unconsciously sensed by surrounding people. However, as will be described later, travel inhibition means for inhibiting travel of the vehicle body when the position detection switch detects that the safety guard is located at the use position protruding above the fork, and / or the position inhibition switch. If the detection switch detects that the safety guard is located at the position of use protruding above the fork, and if a reach prohibition means is provided to prohibit advance of the fork, unloading becomes impossible. Since the damage to the load and the collapse of the load can be prevented, a warning means such as a warning light for giving a visually noticeable warning may be used.
[0018]
Next, another forklift with a lift remote controller according to the present invention (hereinafter referred to as the "third invention") is intended to lift and lower the fork on a pallet supported by the fork in order to achieve the above object. And a position detection switch for detecting the position of the safety guard, and a safety guard provided by the position detection switch. A travel prohibition means for prohibiting travel of the vehicle body when detecting that the vehicle body is located at a use position protruding above the fork.
[0019]
According to the third aspect of the present invention, traveling is prohibited if the safety guard is located at the use position. Therefore, in a forklift such as a counterbalance type forklift having no reach function in which the fork moves forward and backward with respect to the vehicle body, the load is not increased. It becomes impossible to take the cargo, and there is no risk of damage to the cargo or collapse of the cargo at the time of taking the cargo.
[0020]
Here, as a method of prohibiting the running of the vehicle body, a method of restraining the operation of the accelerator operation tool and making it impossible to move, a method of generating a control signal to be given to the control circuit corresponding to the accelerator operation that can move the accelerator operation tool A method in which a control signal is supplied to a control circuit in response to an accelerator operation, but the control signal is ignored or invalidated in the control circuit so that a travel command is not given to the travel motor, a travel motor corresponding to an accelerator operation And two or more of these methods are used in combination.
[0021]
Next, still another forklift with a lift remote controller according to the present invention (hereinafter, referred to as a fourth invention) has a reach function in which the fork moves forward and backward with respect to the vehicle body in order to achieve the above object. A forklift with a remote controller for lifting and lowering a fork on a pallet supported by a pallet and a safety guard for preventing an operator on the pallet from falling down, the position of the safety guard And a reach prohibiting means for prohibiting advancement of the fork when it is detected by the position detection switch that the safety guard is located at the use position protruding above the fork. It is characterized by the following.
[0022]
According to the fourth aspect of the present invention, if the safety guard is located at the use position, the reach of the fork is prohibited, so that the cargo cannot be picked up. There is no danger that the cargo will collapse.
[0023]
There are two ways to prohibit reach-out: a method to disable reach operation tools such as a reach operation lever to a neutral position, and a method to move the reach operation tools, but to give them to the control circuit in response to the reach-out operation. A method of not generating a control signal, a method of giving a control signal to a control circuit in response to a reach-out operation, but disabling or invalidating the control signal to the control circuit so as not to give a position switching command to the direction switching valve, There is a method of checking the advance of the mast, and a method of using two or more of these methods in combination.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
A forklift with a lift remote controller according to an embodiment of the present invention will be specifically described below with reference to the drawings. FIG. 3 is a side view of a forklift with a lift remote controller according to one embodiment of the present invention. As shown in FIG. 3, the appearance of this forklift is the same as a conventional reach-type forklift with a lift remote controller. Are provided with left and right straddle arms 2 on which a mast 3 is supported so as to be able to move back and forth. A lift bracket 4 is supported on the mast 3 so as to be able to move up and down, and a tilt bar 5 and left and right forks 6 are supported on the lift bracket 4 so as to be tiltable.
[0025]
A backrest 7 is supported on the tilt bar 5, and a lift remote controller 8 is attached to the backrest 7, and a fall prevention of an operator riding on a fork 6 to operate the lift remote controller 8. The left and right safety guards 9 are assembled to the backrest 7 for each. Each of the safety guards 9 is disposed between the non-use position overlapping the backrest 7 when viewed from the side and the use position protruding forward from the backrest 7. Is rotated, and is switched between the non-use position and the use position by the switching urging means as required.
[0026]
The driver's cab of the forklift with the lift remote controller includes operating devices such as an accelerator 10, a steering handle 11, a reach operating lever 12, a lift operating lever, a tilt operating lever, and a brake pedal for controlling forward / backward switching and speed. Is provided.
[0027]
The lift operation lever and the tilt operation lever overlap with the reach operation lever 12 in a side view, and thus are omitted in FIG. The brake pedal is omitted from FIG. 3 because it is provided in the vehicle body 1 and cannot be viewed from the side.
[0028]
The backrest 7 is provided with left and right front safety position detection switches for detecting the position of each safety guard 9.
[0029]
FIG. 1 is a circuit block diagram of a control circuit of the forklift with a lift remote controller. The control system includes a control circuit main body 13 composed of, for example, a microcomputer. Switches, sensors, etc., which are operated by operating tools provided on the driver's cab, such as traveling operation detecting means 14 for detecting operation, reach operation detecting means 15 comprising a microswitch which is turned on by operating the reach operating lever 12, Left and right position detection switches 16 and 17 that are turned on when the safety guard 9 is located at the use position are connected.
[0030]
In addition, on the input side of the control circuit body 13, in addition to these, a lift operation detection switch on the vehicle body 1, a lift up operation detection switch on the lift remote controller, a lift down operation detection switch on the lift remote controller, and a tilt operation detection switch However, switches and sensors other than the forward operation detecting means 14, the reach operation detecting means 15, and the safety guard position detecting switches 16 and 17, including these, are not directly related to the present invention and are omitted in FIG. ing.
[0031]
By the way, a traveling motor 18 and a hydraulic pump motor 19 are connected to the output side of the control circuit body 13.
[0032]
In practice, a power steering device and the like are also connected, but these are not shown in FIG. 1 because they are not directly completed in the present invention.
[0033]
FIG. 2 is a flowchart of a control program executed in the control circuit main body 1. As shown in FIG. 2, after the control program starts, in the control circuit main body 13, the accelerator 10 of the cab is operated in the control circuit main body 13. When the operation of the reach operation lever 12 is recognized, that is, when the vehicle body side operation is recognized (S1), one or both of the left and right safety guards 9 are activated based on signals from the left and right detection switches 13 and 14. It is determined whether or not the vehicle is lowered to the use position (S2). When the vehicle is lowered, for example, power supply to the travel motor 18 is cut off to prohibit travel, and the hydraulic pump motor 19 is stopped to reach the vehicle. The operation is prohibited (S4).
[0034]
In addition, the prohibition of running and the prohibition of reach are determined by operating the vehicle body side after the safety guard 9 is located at the non-use position (S1), and subsequently determining that the safety bar has not been lowered (S1). S2), which is released by enabling the running and the reach operation (S4).
[0035]
By the way, in this embodiment, a first alarm means 21 composed of an alarm lamp is connected to the output side of the control circuit main body 13.
[0036]
The first alarm means 21 includes, for example, the vicinity of the reach operation lever 12 of the driver's cab, the vicinity of the accelerator 10, the indicator panel, the back of the mast 3, the back of the lift bracket 4, the back of the backrest 7, and the back of the lift remote controller 8. It is preferable to provide the operator with a line of sight at the time of the loading operation such as the back surface. In particular, the operator can perform the loading operation such as the back of the mast 3, the back of the lift bracket 4, the back of the backrest 7, and the back of the lift remote controller 8. It is preferable to provide it at a position where the line of sight is naturally distributed.
[0037]
The first alarm means 21 is lit when one or both of the safety guard position detection switches 16 and 17 detect that one or both of the left and right safety guards 9 are lowered to the use position. Or, it flashes to warn the operator not to operate the accelerator 10 and the reach operation lever 12 in the driver's seat, whereby the operator can move the vehicle body 1 forward or fork while the safety guard 9 is in the use position. 6 can be prevented from being reached.
[0038]
In the alarm operation of the first alarm means 21, the left or right safety guard 9 is turned on or flashed continuously while one or both of the left and right safety guards 9 are lowered to the use position, and both the left and right safety guards 9 are disabled. It is released by placing it in the use position.
[0039]
In this embodiment, a second alarm means 22 for issuing an alarm consisting of an audible alarm is connected to the output side of the control circuit main body 13.
[0040]
The second alarm means 22 is configured to prohibit the travel and the reach operation as described above when the travel operation or the reach operation is performed in a state where one or both safety guards 9 are lowered to the use position. At the same time, a warning sound is emitted continuously or intermittently to notify the operator that a dangerous driving operation is being performed.
[0041]
The warning operation of the second warning means 22 may be released when the traveling operation and / or the reach operation is released. After the warning is released, the left and right safety guards 9 are moved to the non-use position. , The vehicle body 1 can travel and / or reach. After the warning is released, when the traveling operation and / or the reach operation of the vehicle body 1 is performed again without the left and right safety guards 9 being located at the non-use positions, the second warning means 22 is operated again. Notifies the operator that a dangerous driving operation is being performed.
[0042]
According to this, dangerous driving that may damage the luggage or cause collapse of the load is prohibited, and a warning is given to the surrounding people including the operator that the dangerous driving is about to be performed. In this case, the warning effect on the operator is intimidated and the dangerous driving is canceled, and at the same time, the surrounding people are urged to perform an evacuation action, which is more preferable in improving safety.
[0043]
【The invention's effect】
As described above, the first aspect of the present invention relates to a lift remote controller for lifting and lowering a fork on a pallet supported by a fork, and a safety guard for preventing an operator from falling on the pallet. In a forklift with a lift remote controller comprising: a position detection switch for detecting the position of the safety guard; and the position detection switch detects that the safety guard is located at a use position protruding above the fork. It is characterized by the fact that an alarm means for issuing a caution alarm sometimes is provided, so that it is possible to give an attention to an operator who tries to unload without noticing that the safety guard has been lowered to the use position, whereby The effect that the safety guard can be prevented from being unloaded while lowered to the use position beforehand. Rukoto can.
[0044]
Further, the second invention provides a lift remote controller including a lift remote controller for lifting and lowering the fork on a pallet supported by a fork, and a safety guard for preventing an operator riding on the pallet from falling down. In a forklift equipped with a forklift, a position detection switch for detecting the position of the safety guard, traveling operation detecting means for detecting a traveling operation of the forklift, and that the position detection switch detects that the safety guard is projected above the fork. When the driving operation is detected by the driving operation detecting means while the vehicle is running, a warning means for issuing a dangerous driving warning is provided, so that dangerous driving which may cause damage to the luggage or collapse of the load is started. Can be given to the operator, and this warning can be given to the driver to stop dangerous driving. To, it is possible to prevent that the package of damage or collapse of cargo takes place, it is possible to obtain the effect that it is possible to prompt the evacuation action to notify the risk of collapsing occurs around the workers.
[0045]
Further, the third invention provides a lift remote controller having a lift remote controller for performing a lifting operation of a fork on a pallet supported by a fork, and a safety guard for preventing an operator riding on the pallet from falling down. A forklift with a position detection switch for detecting the position of the safety guard, and when the position detection switch detects that the safety guard is located at a use position protruding above the fork, the vehicle body travels. It is characterized by the provision of a driving prohibition means to prohibit, so that it is not possible to unload freely while the safety guard is lowered to the use position,
In particular, in forklifts that do not have a reach function, such as counterbalanced forklifts, this makes it impossible to reliably unload, so it is necessary to reliably prevent the luggage from being damaged or collapsed by the safety guard. Can be obtained.
[0046]
In addition, the present invention provides a lift remote controller having a reach function for moving the fork forward and backward with respect to the vehicle body, performing a lifting operation of the fork on a pallet supported by the fork, and A forklift equipped with a remote control for a lift provided with a safety guard for preventing a fall of an operator, and a position detection switch for detecting a position of the safety guard, and a use position where the safety guard is projected above the fork by the position detection switch. The device is provided with a reach inhibiting means for inhibiting the fork from advancing when it is detected that the fork is positioned at the position, so that it is impossible to load while the safety guard is lowered to the use position, This ensures that the safety guard does not damage or collapse the load. It is possible to obtain the effect that it is possible.
[Brief description of the drawings]
FIG. 1 is a block circuit diagram of a control circuit according to the present invention.
FIG. 2 is a flowchart of a control program of the present invention.
FIG. 3 is a side view of the present invention.
FIG. 4 is a side view of a conventional example.
[Explanation of symbols]
Reference Signs List 10 Control circuit body 16 Detection switch 17 Detection switch 18 Traveling motor 19 Hydraulic pump motor 21 Alarm means 22 Alarm means

Claims (4)

A forklift with a lift remote controller including a lift remote controller for performing a lifting operation of the fork on a pallet supported by a fork and a safety guard for preventing a fall of an operator on the pallet,
A position detection switch for detecting the position of the safety guard and alarm means for issuing a caution alarm when the position detection switch detects that the safety guard is located at a use position protruding above the fork are provided. A forklift with a lift remote control characterized by being able to be operated. A forklift with a lift remote controller including a lift remote controller for performing a lifting operation of the fork on a pallet supported by a fork and a safety guard for preventing a fall of an operator on the pallet,
A position detection switch for detecting a position of the safety guard, a traveling operation detecting means for detecting a traveling operation of the forklift, and traveling when the safety guard is detected to be protruded above the fork by the position detection switch. A forklift with a lift remote controller, further comprising alarm means for issuing a dangerous driving alarm when a driving operation is detected by the operation detecting means. A forklift with a lift remote controller including a lift remote controller for performing a lifting operation of the fork on a pallet supported by a fork and a safety guard for preventing a fall of an operator on the pallet,
A position detection switch for detecting the position of the safety guard, and a travel prohibition for prohibiting traveling of the vehicle body when the position detection switch detects that the safety guard is located at a use position protruding above the fork. A forklift with a lift remote control, characterized in that means are provided. A lift remote controller for raising and lowering the fork on the pallet supported by the fork, having a reach function for the fork to move forward and backward with respect to the vehicle body; and a safety for preventing the operator riding on the pallet from falling down. In a forklift with a lift remote control having a guard,
A position detection switch for detecting the position of the safety guard, and a reach prohibition for prohibiting advance of the fork when the position detection switch detects that the safety guard is located at a use position protruding above the fork. A forklift with a lift remote control, characterized in that means are provided.

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