JPH05112967A - Lighting device of large size construction machine - Google Patents

Abstract

PURPOSE:To enable an operator to safely and rapidly get off on the ground from the driving cab even if it is dark in the surrounding, by providing a light illuminating the descending way and a light controller lighting for a specified period in a specified condition. CONSTITUTION:When an operator turns off a key switch 13 to stop the engine, the key switch 13 is connected to a terminal (a). Next, when the operator opens the door 5 of the driving cab 4 to get off therefrom, a door switch 14 is turned on. In this case, a main switch 16 is closed. Next, the actuation condition of a timer 15 becomes effective by changingover of the key switch 13 and the door switch 14 and then the illuminators 9, 10 are turned on and the time of the timer 15 starts counting. Accordingly, a ladder 2, a cat walk 6, a stay 7, and a step 8 are illuminated brightly by the illuminators 9, 10. This condition is kept while the timer continues the counting work and after a specified time interval, the illuminators are put off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device for a large construction machine that illuminates a hoistway to a driver's cab.

[0002]

2. Description of the Related Art Conventionally, as a lighting device for construction machines such as large hydraulic excavators, there is an interior light that illuminates the inside of a driver's cab. This indoor light is turned on / off by a switch operation, but recently, a means for turning off the light after a predetermined time has passed since the door of the cab was opened has been developed. Further, as an illumination light other than the indoor light, there is a headlight that illuminates a work area such as excavation work, and the headlight is turned off by turning off the changeover switch after the work at night is completed.

[0003]

As described above, conventional lighting devices for construction machines have been limited to indoor lights and headlights. By the way, in a large construction machine such as a large hydraulic excavator, the height of the cab from the ground is high (for example, 5 to 5).
6m), the journey to the cab is long and steps and catwalks are provided along the way. For this reason, when the operator leaves the driver's cab in a dark environment, there is a danger that the operator's foot is dark and the operator may step off the foot. In this case, the above-mentioned headlight is turned off because the operator leaves the machine, and even if the interior light is on for a certain period of time as described above, it only illuminates the inside of the driver's cab and the danger cannot be eliminated.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art and to provide a lighting device for a large construction machine in which the operator can get out of the cab without danger in a dark environment.

[0005]

To achieve the above object, the present invention provides a lower structure, a revolving structure rotatably supported by the lower structure, and a driver's cab installed on the revolving structure. In a large-sized construction machine having a hoistway from the lower structure to the operator's cab, a lighting control means for lighting the hoistway and lighting the lamp under a predetermined condition for a predetermined time is provided. It is characterized by being provided.

[0006]

When a predetermined condition is created by the operation of the operator, for example, the operation is stopped or the driver's door is opened, or both of them are formed, the illumination lamp for illuminating the hoistway is turned on for a predetermined time. Therefore, there is no danger of the operator getting off the vehicle even when the surroundings are dark.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to illustrated embodiments.

FIG. 1 is a side view showing a main part of a large hydraulic excavator equipped with a lighting device according to an embodiment of the present invention. In the figure, 1 is a lower structure including a traveling device, and 2 is a lower structure 1.
It is a ladder installed in. Reference numeral 3 denotes a revolving structure which is rotatably arranged on the lower structure 1, and 4 denotes an operator cab arranged on the revolving structure 3. 5 is a door of the driver's cab 4, 6 is a catwalk as a passage leading from the lower side of the door 5 of the driver's cab 4 of the revolving structure 3 to the rear engine room, 7 is a stay on the catwalk 6, and 8 is a driver's cab It is a step leading from the door 5 of 4 to the catwalk 6. The ladder 2, the catwalk 6, and the step 8 constitute a process of getting on and off the cab 4, that is, a hoistway. Reference numeral 9 is a lamp for illuminating the step 8 and the catwalk 6 in the vicinity thereof. 10 is a ladder 2 and the catwalk 6 in the vicinity thereof.
Is a lighting lamp that illuminates. The hoistway is illuminated by turning on these illumination lamps 9 and 10.

FIG. 2 is a circuit diagram showing an electric circuit of the illumination lamp shown in FIG. In the figure, 9 and 10 are the illumination lamps shown in FIG.
2 is a power supply. Reference numeral 13 denotes a key switch for starting the engine. The OFF position when the engine is stopped is indicated by the terminal a, and the ON position when the engine is driven is indicated by the terminal b. Reference numeral 14 denotes a door switch that operates in response to opening and closing of the door 5 of the operator's cab 4, which is closed when the door 5 is open and opened when the door 5 is closed. Reference numeral 15 is a timer that operates according to the states of the key switch 13 and the door switch 14, and 16 is a main switch that turns off the illumination lamps 9 and 10 regardless of whether the key switch 13 or the door switch 14 is opened or closed. The timer 15 will be described in detail in the description of the operation described later.

Next, the operation of this embodiment will be described. When the work is finished in the dark surroundings, the operator turns off the key switch 13 to stop the engine, so that the key switch 13 is connected to the terminal a. Then, the operator opens the door 5 of the cab 4 and goes outside. As a result, the door switch 14 is turned on. The main switch 16 is assumed to be closed. By the switching of the key switch 13 and the door switch 14, the timer 15
The operating condition is satisfied, and in the timer 15, the circuits to the illuminating lamps 9 and 10 are turned on to turn on the illuminating lamps 9 and 10, and at the same time, the timer 15 starts counting the time. By turning on the illumination lights 9 and 10, the ladder 2, the catwalk 6, the stay 7, and the step 8 in the hoistway to the cab 4 are illuminated brightly. This state is maintained while the timer 15 is counting, and does not change even if the operator closes the door 5 and opens the door switch 14. Therefore, the operator can safely and quickly get off the step 8, cross the catwalk 6, and further get off the rudder 2 to leave the excavator on the ground. When the time set in timer 15 has elapsed, timer 1
5 stops operating, the circuit to the illuminating lamps 9 and 10 in the conductive state is cut off, and the illuminating lamps 9 and 10 are turned off. After that (for example, the next morning), when the operator enters the cab 4 to start the work and operates the key switch 13 to the ON position, the key switch 13 is connected to the terminal b and the timer 1
A voltage for resetting is applied to 5, and the timer 15 is reset. This allows the timer 15
However, even if the count is interrupted for some reason, the next operation will not be hindered.

As described above, in this embodiment, when the operator stops the engine and further opens the door, the illumination lamps 9 and 10 are automatically turned on and the ladder 2 in the hoistway to the operator cab 4 is opened. Since the catwalk 6, the stay 7, and the step 8 are illuminated, the operator can safely and quickly exit the hoistway and leave the large hydraulic excavator to the ground. Further, since the lighting time of each of the illumination lamps 9 and 10 is controlled by the timer 15, each of the illumination lamps 9 and 10 is operated after the operator leaves the large hydraulic excavator.
Does not continue to light up unnecessarily and the power source 12 is not hindered, and therefore the operator need not worry about turning off the illumination lamps 9 and 10.

In the description of the above embodiment, a large hydraulic excavator was illustrated, but it goes without saying that it can be applied to other large construction machines. Also, an example in which two illumination lights are provided has been described, but the installation location and the number of installation of the illumination lights can be arbitrarily selected according to various conditions. Furthermore, although an example of using a key switch and a door switch has been described as the operating condition of the timer, the present invention is not limited to this, and only one of them may be used. Furthermore, in place of the key switch, a switch or the like that detects that all the operation levers of the large construction machine are OFF (neutral position) can be used. Further, it goes without saying that the timer setting time can be set to an arbitrary time. If the power consumption is extremely high, the main switch 16 may be opened.

[0013]

According to the present invention, since an illumination lamp is provided in the hoistway of a large construction machine and the illumination lamp is turned on for a predetermined time under a predetermined condition, the operator can operate even in dark surroundings. You can safely and quickly descend the hoistway and leave the ground. In addition, it is not necessary to consider the turning off of the illumination lamp.

[Brief description of drawings]

FIG. 1 is a side view showing a main part of a large hydraulic excavator provided with a lighting device according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing an electric circuit of the illumination lamp shown in FIG.

[Explanation of symbols]

 1 Lower structure 2 Ladder 3 Revolving structure 4 Operator's cab 5 Door 6 Catwalk 8 Steps 9, 10 Lighting 13 Key switch 14 Door switch 15 Timer 16 Main switch

Claims (6)

[Claims] 1. A lower structure, a revolving structure rotatably supported by the lower structure, a cab installed on the revolving structure, and a hoistway from the lower structure to the cab. A large construction machine equipped with an illumination lamp for illuminating the hoistway, and a lighting control means for lighting the illumination lamp under a predetermined condition for a predetermined time. 2. The lighting control means according to claim 1, comprising a lighting command means, and a timer which shuts off a circuit of the lighting lamp after a predetermined time has elapsed since the lighting lamp was lighted by the lighting command means. Lighting equipment for large construction machines characterized by being used. 3. The switch according to claim 2, wherein the lighting command means is a switch that is opened / closed when the operation is stopped in association with the operation of the operation command means of the large-sized construction machine, and the opening / closing of a door of the cab is interlocked. A lighting device for a large construction machine, comprising at least one switch that is closed when the door is opened. 4. The lighting device for a large construction machine according to claim 1, wherein the lighting control means can appropriately change a lighting set time by an operator's operation. 5. The lighting of the illumination lamp according to claim 1, 2 or 3, regardless of whether or not each switch is operated by a switch operation by an operator or by a sensor output that automatically detects the brightness of the outside world. A lighting device for a large construction machine, which is provided with a lighting prohibition means for prohibiting lighting. 6. The hoistway according to claim 1, wherein the hoistway includes a step, a ladder, or a catwalk on the way, and the illumination lamp is located at a position where the step, the ladder, or the catwalk is individually illuminated. A lighting device for a large construction machine characterized by being arranged.