JP2003312990A - Safety display device for on-vehicle crane - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily recognize an unsafe condition if so even when surrounding noise is high or operation is performed from a distant position, and recognize a safe condition if so, that is, that a safety device operates properly. <P>SOLUTION: At an easily visible position of an on-vehicle crane 1, there are provided a plurality of indicating lamps 10G, 10R with different lighting colors, which are lighted up corresponding to whether a working condition is safe or unsafe. <P>COPYRIGHT: (C)2004,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety display device for preventing a vehicle-mounted crane from being damaged or overturning, and performing a safe crane operation. 2. Description of the Related Art As shown in FIG.
Is a base 6 attached to a chassis frame 5 between a driver's cab 3 and a loading bed 4 of a vehicle 2, a column 7 pivoting on the base 6, and a telescopic boom pivotally supported at an upper end of the column 7. 8 and an outrigger 9 that protrudes from the base 6 to the left and right sides to ground and secure stability. At the time of crane operation, the vehicle 2 is stopped,
After the outrigger 9 is extended to secure stability, the boom 8
Is extended, retracted, and swung to suspend the load, load the load 4 and unload the load. At this time, if the load of the suspended load is excessive or the posture of the boom 8 is inappropriate, damage or overturning may occur. Therefore, the on-vehicle type crane 1 generally distinguishes between a safe state and an unsafe state during crane operation and informs an operator of the non-safe state by using an overload prevention device or a safety device such as a fall prevention device. Equipment. In these safety devices, as an alarm device for notifying an operator of a non-safety state, an alarm buzzer 50 provided on a column 7 as shown in FIG. 5 and a display provided on a side surface of a boom 8 as shown in FIG. A lamp 60 is used (Japanese Unexamined Patent Publication No.
No. 70). [0005] The alarm buzzer 50 emits an intermittent sound when approaching a danger state and switches to a continuous sound when the danger state is reached, in order to notify an unsafe state. Call attention. The indicator light 60 lights or flashes when the non-safety state is reached to call attention to a worker or a person around the on-board crane 1. [0006] However, it is difficult to hear a warning by a sound such as the warning buzzer 50 in a place where the surrounding noise is loud. In recent years, the on-vehicle type crane 1 is often used for remote operation, and it is more difficult to hear when operating from a remote position. In addition, both the conventional alarm buzzer 50 and the indicator light 60 are designed to issue an alarm when approaching a non-safety state, that is, approaching a dangerous state or reaching a dangerous state, and nothing is displayed in the safe state, It is not known whether the safety device is working properly. The present invention solves the above-mentioned problem in the alarm device of the on-vehicle crane. The present invention provides an unsafe state, that is, a dangerous state even when the surrounding noise is loud or the operation is performed from a remote position. When approaching or reaching a dangerous state, a vehicle-mounted crane that can easily recognize the state and, even when it is in a safe state, confirm that it is in a safe state and that safety devices are operating normally It is an object to provide a safety display device. [0008] A safety display device for a vehicle-mounted crane according to the present invention is illuminated at a position easily visible to the vehicle-mounted crane according to a safe state and a non-safe state at the time of work. The above problem is solved by providing a plurality of indicator lamps having different lighting colors. In the safety display device of the vehicle-mounted crane of the present invention, during the crane operation, the indicator light of the lighting color indicating the safety state is lit if the safety state, and the lighting color display indicating the non-safety state if the non-safe state. The light comes on. The indicator light is provided at a position where it is easily visible, and displays a lighting color indicating the non-safety state when the non-safety state is reached even when the surrounding noise is loud or when the operation is performed from a remote position. Since the state can be easily recognized by turning on the lamp, the operator can take prompt action to eliminate the unsafe state. When the vehicle is in the safe state, the indicator light of the lighting color indicating the safety state can be lit to confirm that the vehicle is in the safe state and that the safety device is operating normally. Can be operated. FIG. 1 is a side view of a vehicle-mounted crane provided with a safety display device according to an embodiment of the present invention. The on-vehicle type crane 1 includes a base 6 attached to a chassis frame 5 between a driver's cab 3 of a vehicle 2 and a carrier 4.
A column 7 that pivots on the base 6, an expandable and retractable boom 8 pivotally supported at the upper end of the column 7, and an outrigger 9 that protrudes from the base 6 to the left and right sides to contact the ground to ensure stability. And The on-vehicle type crane 1 is provided with a well-known fall prevention device (not shown) for preventing the crane from overturning. The crane 1 is in a safe state or an unsafe state during the crane operation. Can be determined. A safety display device 10 for displaying the determination result, that is, a safety display and a non-safety display, is provided on both side surfaces of the distal end portion of the base boom of the boom 8. Since this installation position is high from the ground, the safety display device 10 can be easily visually recognized even from a long distance. The safety display device 10 includes a green indicator light 10G and a red indicator light 10R. When a safety display is performed, the green indicator light 10G is turned on, and the non-safety indicator is turned on. When displaying, the green indicator light 10G is turned off and the red indicator light 10R is turned on.
When the crane operation is performed with the on-board crane 1, if the vehicle is in a safe state, the safety display device 10 turns on the green indicator light 10 </ b> G to indicate that the vehicle is in the safe state, and the fall prevention device is operating normally. Indicates that When the vehicle enters the non-safety state, the lighting is switched to the red indicator lamp 10R to indicate that the vehicle is in the non-safety state. The indicator lights 10G, 1
0R is provided at a position where it is easily visible, and even when the surrounding noise is loud or when the operation is performed from a remote position,
In the case of the non-safety state, the operator can take prompt action to eliminate the danger state. Further, when the vehicle is in the safe state, it can be confirmed that the vehicle is in the safe state and that the overturn prevention device is operating normally, and the operator can operate the on-vehicle crane 1 with ease. The indicator lamps 10G and 10R can be used not only continuously but also blinking or rotating lamps in order to improve visibility. In this case, the blinking time may be changed or the rotation speed may be changed. For example, the blinking speed of the indicator light 10R can be changed, the safety indicator blinks the green indicator light 10G at a predetermined interval, and the non-safety indicator is displayed when the danger state is approached. The 10G is turned off and the red indicator light 10R blinks at a predetermined interval to perform a fall danger warning display. When a dangerous state is reached, the blinking time of the red indicator light 10R is increased to perform a fall danger warning display. can do. Further, the indicator lamp 10G of the safety display device 10,
A rotating light is used for the 10R, and the safety indicator is a green indicator light 10
When G is turned on to rotate at a predetermined rotation speed and the non-safety display is performed, the green indicator light 1
0G is turned off to stop the rotation, and the red indicator light 10
R is turned on and rotated at a predetermined rotation speed to give a fall danger notice display. When the danger state is reached, a red indicator light 10R
It is also possible to increase the rotation speed of the vehicle and display a falling danger warning. Here, the lighting color is switched from green to red at the time of switching from the safety display to the fall danger notice display, but the lighting color may be selected from other combinations of colors such as blue and yellow. it can. If the indicator lights 10G and 10R and the alarm buzzer are used together, the safety can be further improved. In this case, the alarm buzzer does not sound when performing the safety display, the intermittent sound when performing the fall danger notice display, and the continuous sound when performing the fall danger warning display. In addition, a known overturn prevention device that stops operation of the crane when the overturn danger state is reached during crane operation.
Even when combined with the overload prevention device, it is effective because it is possible to strongly complain to the worker that the state is dangerous. FIG. 2 is a side view of a vehicle-mounted crane provided with a safety display device according to another embodiment of the present invention. The safety display device 20 is an example in which the lighting color is switched when a fall (or overload) danger warning display is switched to a fall (or overload) danger warning display.
That is, the safety indicator 20 is a green indicator light 20.
G, a yellow indicator light 20Y, a yellow indicator light 20R, and a red indicator light 20R. A green indicator light 20G is provided for performing a safety display, and a yellow display is provided for performing a fall danger notice display. The light 20Y and the red indicator light 20R are turned on when a fall danger warning display is performed. When a crane operation is performed with the on-board crane 1, if the vehicle is in a safe state, the safety display device 20 turns on the green indicator light 20G to indicate that the vehicle is in the safe state, and the fall prevention device operates normally. Indicates that you are doing. When approaching the danger of falling, the yellow indicator lamp 20Y is switched on, and a warning is displayed indicating that the danger of falling may occur. When the danger of falling is reached, the red indicator lamp 20R is switched on and a warning is displayed to indicate that the danger of falling is present. The indicator lamps 20G, 2
The 0Y and 20R are provided at positions that are easily visible, so that even if the surrounding noise is loud or the operation is performed from a remote position, the operator can quickly cancel the non-safety state if the non-safety state is reached. Can be dealt with. Further, when the vehicle is in the safe state, it can be confirmed that the vehicle is in the safe state and that the overturn prevention device is operating normally, and the operator can operate the on-vehicle crane 1 with ease. Indicator lights 20G, 20 of the safety display device 20
As shown in FIG. 3, Y and 20R can be arranged on the upper end of the column 7 so as to be vertically stacked. Further, as shown in FIG. 4, it may be arranged at a plurality of places such as both side surfaces of the distal end portion of the base end boom of the boom 8 and the upper end portion of the column 7. In addition, in order to improve visibility, the indicator lights 20G, 20Y, and 20R can be used not only continuously but also blinking or using a rotating light.
In this case, the blinking time may be changed or the rotation speed may be changed. As described above, the safety display device of the on-vehicle crane according to the present invention can be used when the ambient noise is large,
Even when operating from a distant position, the user must be able to easily recognize the non-safety state, that is, approaching or reaching the danger state, and also be in the safe state when in the safe state. It can be confirmed that the safety device is operating normally. Therefore, the work state can be always grasped, and the safety is improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a vehicle-mounted crane provided with a safety display device according to an embodiment of the present invention. FIG. 2 is a side view of a vehicle-mounted crane provided with a safety display device according to another embodiment of the present invention. FIG. 3 is a side view of a vehicle-mounted crane in which a safety display device is disposed at an upper end of a column. FIG. 4 is a side view of a vehicle-mounted crane in which a safety display device is disposed at a distal end portion of a base boom and an upper end portion of a column. FIG. 5 is a side view of a vehicle-mounted crane provided with a conventional alarm buzzer. FIG. 6 is a side view of a vehicle-mounted crane provided with a conventional indicator light. [Description of Signs] 1 On-board crane 2 Vehicle 3 Operator's cab 4 Carrier 5 Chassis frame 6 Base 7 Column 8 Boom 9 Outrigger 10 Safety indicator 10G, 10R Indicator 20 Safety indicator 20G, 20R, 20Y Indicator

Claims (1)

Claims 1. A plurality of indicator lights of different lighting colors which are lit according to a safe state and a non-safe state at the time of work are provided at a position easily visible on a vehicle-mounted crane. Characteristic safety display device for on-board cranes.