JP2003082709A - Warning device of construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a warning device of a construction machine causing no problem such as noise particularly at night when sending a sign and a warning to a drive of a dump truck and the other worker staying around the construction machine. SOLUTION: A warning light 7 is arranged in the construction machine beside a horn 8, and a switch 12a having two contact points 13 and 14 is arranged for turning on the light 7 and the horn 8 in order according to an operation quantity of a push button 12 arranged on a grip 11 of an operation lever 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alarm device mounted on a construction machine such as a hydraulic excavator for sending a signal or an alarm to a dump truck or an operator when working at night. .

[0002]

2. Description of the Related Art A hydraulic excavator, which is an example of a construction machine,
It is composed of a lower traveling structure, an upper revolving structure, and a front attachment such as a boom, an arm, and a bucket. A driver's cab is provided in the upper swing body, and an operator operates a control lever provided in the driver's cab to move a front mechanism to perform various operations. For example, the work of excavating the soil and loading it into the dump truck is performed by operating the front mechanism to excavate the soil with the bucket, and turning to discharge the soil into the dump truck.

For example, the above-mentioned work is performed in the hydraulic excavator. When the driver of the dump truck is notified of the work status such as the start and end of the loading work, the hydraulic shovel is operated to the workers in the vicinity. A horn device is used as an alarm when it is activated.

However, in recent years, civil engineering work is often performed at night, especially in urban areas, and noise to the surroundings is a problem.

From the above, the volume of the horn can be adjusted according to the operation amount of the push button provided on the grip of the operation lever.
Known from the publication.

[0006]

However, in the above-mentioned prior art, the adjustment of the sound volume depends on the human sense after all, and the sound volume varies each time the horn is sounded. Therefore, even at night, it is considered difficult to produce a stable and appropriate volume, for example, by pushing the push button too strongly and producing a louder volume than necessary.

In the conventional technique, the horn is sounded without distinguishing the signal to the dump truck and the alarm to the surrounding workers as described above. for that reason,
Since the horn is frequently used, it causes a noise problem at night. However, without the use of a horn, there is a signal to the dump truck during nighttime work, or when the operator is only in front of the work radius of the hydraulic excavator etc. and the operator warns when he is in his field of view. There are times when it is finished.

An object of the present invention is to provide an alarm device which can solve the above problems.

[0009]

In order to achieve the above-mentioned object, the present invention is characterized by providing an alarm horn as an alarm device in addition to an alarm horn, and selectively using the light and the horn. It is a thing. Therefore, a switch with two contacts that turn on the light and the horn in order according to the amount of operation of the push button on the grip of the operating lever is provided for easy operation. This will cause the alarm light to light when the first switch is on and the horn to sound when the second switch is on. The warning light was installed at a location that was easily visible from the surroundings, and it was a light that emitted a different color from the work lighting so that it could be easily distinguished from the work lighting. Further, the alarm light may be made to blink. Further, it is preferable that the switch is provided inside a grip of an operation lever provided in a driver's cab.

[0010]

In the alarm device of the present invention, the first switch is turned on by lightly pressing the push button, and the light is turned on while the switch is pressed. By pressing harder, it toggles and the second switch is turned on, the light goes off and the horn rings. As a result, the operator does not have to give a warning light to the dump truck during nighttime work or an alarm when the worker is in his field of view, and an alarm or noise when the worker may be behind. For example, a horn can be used as an alarm at the work site, and different alarm methods can be used according to the situation.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. First, FIG. 1 shows a configuration of a hydraulic excavator as an example of a construction machine to which the present invention is applied. In FIG. 1, 1 is a lower traveling structure and 2 is an upper revolving structure. As a front working mechanism on the upper swing body,
A boom 3, an arm 4, a bucket 5, and a driver's cab 6 are attached. The alarm lights 7 used as an alarm device are attached to the boom, the cab, and the front and rear four of the side passages at a total of six locations. The mounting position is just an example, and the mounting position can be appropriately set at a location easily visible.
Further, 8 is a horn for alarm, which is attached to an appropriate position such as a front part or a rear part of the revolving structure.

The hydraulic excavator constructed in this way operates the front mechanism at the work site to excavate the earth and sand, turn it and load it on the dump truck.

FIG. 2 shows the inside of the cab 6 to which the present invention is applied. Reference numeral 9 is a driver's seat, 10 is an operation lever, 11 is a grip of the operation lever, and 12 is a push button provided on the grip 11. The operator sits in the driver's seat 9 and operates the operation levers 11 and 11 to operate the front mechanism.

FIG. 3 is a vertical sectional view of the grip 11 shown in FIG. Reference numeral 11a is made of an elastic material having elasticity and forms a part of the grip 11. When the push button 12 is pressed, it can be pushed down by the driver's finger from the outside of the elastic material. 12a is one terminal of a switch that operates in conjunction with the push button 12, and 13 is a warning light 7.
, And 14 is a switch terminal of the horn 8. Further, when the push button 12 is pushed, the terminal 12a is lowered downward in FIG. 3, and when the pushing is stopped, the terminal 12a is returned upward by a spring (not shown) incorporated therein. The push button 12 may be attached to any one of the operation levers or a plurality of operation levers.

FIG. 4 shows an electric circuit diagram of the alarm device of the present invention. In FIG. 4, reference numeral 15 is a power source, which is usually composed of a battery mounted on a hydraulic excavator.

The operation of the present invention configured as described above will be described. In FIGS. 3 and 4, first, the push button 1
Light 7 for alarm until the pushing stroke of 2 is up to S
The switch terminal 13 is turned on, and the alarm light 7 is turned on. When the push button 12 is further pushed and the stroke becomes S or more, the alarm light 7 is switched off, that is, the terminal 12a and the switch terminal 13 are turned off, and the switch terminal 14 of the horn 8 comes into contact with the terminal 12a and is turned on. And the horn 8 rings.

Therefore, when the operator gives a signal to the dump truck or when the operator is only in the field of view or during nighttime work, the push button 12 is slightly pushed to turn on the warning light 7 only. At that time, the alarm light 7 may be blinked by intermittently pressing the push button 12.

The alarm light 7 emits light of different colors such as blue, red and green so that it can be easily distinguished from a working lamp. The push button 12 is used for alarms by the alarm light 7 that are not noticed, alarms for workers behind, or when daytime noise is not a problem.
Is further pressed and the horn 8 is sounded to give an alarm. As a result, it is possible to avoid using the horn as much as possible during nighttime work, etc., and it is possible to reduce noise to the surroundings.

Although a plurality of warning lights 7 are provided in the above embodiment, one warning light 7 may be provided, for example, in the upper part of the cab 6 so that the warning lights 7 can be visually recognized from all directions around the hydraulic excavator. May be.

Although it has been described that the alarm light 7 is made to blink by pressing the push button 12, the terminal 12 is provided on the circuit connecting the power supply 15 and the alarm light 7 in FIG.
A means for automatically blinking the warning light 7 when a and the switch terminal 13 for the warning light 7 are turned on may be incorporated.

Further, although the switch of the alarm light 7 is turned off when the switch of the horn 8 is turned on, the switch may be kept on without being turned off.

[0022]

According to the alarm device of the present invention, the operator can selectively use the alarm light and the horn by only lightly or strongly pressing the push button of the operation lever. Since the stroke S of the push button required to turn on the alarm light is sufficient, it is possible to prevent the horn from erroneously ringing even if the push button is pushed a little hard and the amount of push button variation varies with each operation. As a result, it is possible to easily use the light and then the horn to give a signal and an alarm to the surroundings without the troublesome operation, depending on the situation. Therefore, nighttime work and noise problems in urban areas can be solved.

[Brief description of drawings]

FIG. 1 is a side view of a hydraulic excavator as an example of a construction machine equipped with an alarm device of the present invention.

FIG. 2 is a front view of the inside of a driver's cab provided in the hydraulic excavator of FIG.

FIG. 3 is a vertical cross-sectional view of the grip of the operation lever in FIG. 2, showing a push button type switch portion provided on the grip.

FIG. 4 is an electric circuit diagram of the alarm device of the present invention.

[Explanation of symbols]

6 cab 7 Warning light 8 horns 10 Operation lever 11 Grip of operating lever 12 Grip push button 12a Pushbutton 12 switch terminal 13 Alarm light switch terminal 14 Horn switch terminal 15 power supply

Claims (5)

[Claims] 1. In a construction machine having a horn as an alarm device, an alarm light is provided in addition to the horn, and when the operator sends a signal or an alarm to the surroundings, the alarm light, An alarm device for a construction machine, which is equipped with a switch that turns on in the order of a horn. 2. The alarm device for a construction machine according to claim 1, wherein the alarm light is a light which emits light of a color different from that of a work illumination lamp provided in the construction machine. 3. The alarm device for a construction machine according to claim 1, wherein at least one of the warning lights is provided at a position visible from all directions around the construction machine. 4. The alarm device for a construction machine according to claim 1, wherein the alarm light is turned on while blinking automatically when the switch is turned on. 5. The alarm device for a construction machine according to claim 1, wherein the switch is provided inside a grip of an operation lever included in the construction machine.