JP2913230B2 - Lighting equipment for large construction machinery - Google Patents

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 for illuminating a hoistway to a cab.

[0002]

2. Description of the Related Art Hitherto, as a lighting device for construction machines such as a large hydraulic excavator, there is an interior light for illuminating a driver's cab. The interior light is turned on and off by a switch operation, but recently, means for turning off the light after a predetermined time after opening the door of the cab has been developed. As an illumination light other than the interior light, there is a headlight for illuminating a work area such as an excavation work, and this headlight is turned off by turning off a changeover switch after the end of nighttime work.

[0003]

Conventional lighting devices for construction machines have been limited to interior lights and headlights as described above. 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 cab in a dark state, there is a danger that the foot is dark and the driver may step on the foot, and safety has been a problem. In this case, the above-mentioned headlight is turned off because the operator leaves the machine, and even if the interior light is turned on for a certain period of time as described above, it only illuminates the driver's cab and the danger is not solved.

An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a lighting device for a large construction machine in which an operator can get out of a driver's cab without danger in a dark surrounding.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a lower structure, a revolving body rotatably supported by the lower structure, and a cab installed on the revolving body. In a large-sized construction machine having a hoistway from the lower structure to the driver's cab, a lighting control unit for illuminating the hoistway and illuminating the lighting lamp under predetermined conditions for a predetermined time is provided. It is characterized by having been provided.

[0006]

According to the operation of the operator, when predetermined conditions are established, for example, when the operation is stopped or the door of the cab is opened, or both of them, the illumination lamp for illuminating the hoistway is turned on for a predetermined time. For this reason, there is no danger of the operator getting off even if the surroundings are dark.

[0007]

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

FIG. 1 is a side view showing a main part of a large-sized hydraulic excavator provided with a lighting device according to an embodiment of the present invention. In the figure, 1 is a lower structure including a traveling device, 2 is a lower structure 1
It is a ladder installed in. Reference numeral 3 denotes a revolving unit arranged on the lower structure 1 so as to be freely rotatable, and 4 denotes a driver's cab arranged on the revolving unit 3. 5 is a door of the cab 4, 6 is a catwalk as a passage leading from the lower side of the door 5 of the cab 4 of the revolving structure 3 to the rear engine room, 7 is a stay on the catwalk 6, 8 is a cab 4 is a step leading from the door 5 to the catwalk 6. The ladder 2, the catwalk 6, and the step 8 constitute a step of getting on and off the cab 4, that is, a hoistway. 9 is an illuminator for illuminating the step 8 and the catwalk 6 near the step 8, and 10 is the ladder 2 and the catwalk 6 near the step.
It is an illumination light for illuminating the. 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 drawing, reference numerals 9 and 10 denote illuminating lamps shown in FIG.
2 is a power supply. Reference numeral 13 denotes a key switch for starting the engine. An OFF position when the engine is stopped is indicated by a terminal a, and an ON position when the engine is driven is indicated by a terminal b. Reference numeral 14 denotes a door switch that operates in response to the opening and closing of the door 5 of the cab 4, and is closed when the door 5 is open and opened when the door 5 is closed. Reference numeral 15 denotes a timer which operates according to the state of the key switch 13 and the door switch 14, and 16 denotes a main switch for turning off the illuminating lights 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 later in the description of the operation.

Next, the operation of this embodiment will be described. When the operation is completed in a dark state, the operator turns off the key switch 13 to stop the engine, whereby the key switch 13 is connected to the terminal a. Subsequently, the operator opens the door 5 of the cab 4 and goes out. Thereby, the door switch 14 is turned on. It is assumed that the main switch 16 is closed. By the switching of the key switch 13 and the door switch 14, the timer 15
Is established, the circuit to the lighting lamps 9 and 10 is turned on in the timer 15, and the lighting lamps 9 and 10 are turned on. At the same time, the timer 15 starts counting time. The ladder 2, the catwalk 6, the stay 7, and the step 8 in the hoistway to the cab 4 are brightly illuminated by the lighting of the illumination lights 9 and 10. This state is maintained while the timer 15 is performing the counting operation, and does not change even if the operator closes the door 5 and opens the door switch 14. This allows the operator to safely and quickly exit step 8, cross the catwalk 6, and further down the ladder 2 to leave the excavator to the ground. When the time set in the timer 15 elapses, the timer 1
5 stops operating, the circuit to the lighting lamps 9 and 10 that were in the conductive state is cut off, and the lighting lamps 9 and 10 are turned off. Thereafter (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
5 is supplied with a voltage for reset, and the reset operation of the timer 15 is performed. Thereby, the timer 15
Does not hinder the next operation even if the counting is interrupted for some reason.

As described above, in this embodiment, when the operator stops the engine and further opens the door, the illuminating lights 9 and 10 are turned on automatically, and the ladder 2 in the hoistway to the cab 4 is turned on. , The catwalk 6, the stay 7, and the step 8 are illuminated, so that the operator can safely and quickly descend the hoistway and move off the large excavator to the ground. Further, since the lighting time of each of the illuminating lights 9 and 10 is controlled by the timer 15, after the operator leaves the large excavator, each of the illuminating lights 9 and 10 is turned off.
Does not continue to be turned on unnecessarily, and does not disturb the power supply 12, so that the operator does not need to care about turning off the illumination lights 9, 10.

In the above description of the embodiment, a large-sized hydraulic excavator has been exemplified, but it is needless to say that the present invention can be applied to other large-sized construction machines. Also, the example in which two lighting lamps are provided has been described, but the installation location and the number of the lighting lamps can be arbitrarily selected according to various conditions. Furthermore, the example in which the key switch and the door switch are used as the operation condition of the timer has been described. However, the present invention is not limited to this, and only one of them may be used. Still further, instead of the key switch, a switch or the like that detects that all the operation levers of the large construction machine have been turned off (neutral position) can be used. In addition, it is natural that the timer can be set to an arbitrary time. If the power supply is greatly consumed, the main switch 16 may be opened.

[0013]

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

[Brief description of the drawings]

FIG. 1 is a side view showing a main part of a large-sized 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]

 DESCRIPTION OF SYMBOLS 1 Lower structure 2 Rudder 3 Revolving body 4 Operator's cab 5 Door 6 Catwalk 8 Step 9,10 Illumination light 13 Key switch 14 Door switch 15 Timer 16 Main switch

Claims (6)

(57) [Claims] 1. A lower structure, a revolving body rotatably supported by the lower structure, a cab installed on the revolving body, and a hoistway from the lower structure to the cab. A lighting device for a large construction machine, comprising: a lighting device for illuminating the hoistway; and lighting control means for lighting the lighting lamp under a predetermined condition for a predetermined time. 2. The lighting control means according to claim 1, wherein the lighting control means comprises a lighting instruction means, and a timer for shutting off a circuit of the lighting lamp after a lapse of a predetermined time since the lighting lamp is turned on by the lighting instruction means. A lighting device for a large construction machine, wherein the lighting device is used. 3. The switch according to claim 2, wherein the lighting command means is a switch that opens and closes when the operation is stopped in relation to the operation of the operation command means of the large construction machine, and interlocks with opening and closing of a door of the cab. A lighting device for a large construction machine, comprising at least one of a switch which is closed when a 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 set lighting time by an operation of an operator. 5. The lighting of the illumination lamp according to claim 1, 2 or 3, irrespective of whether or not each of the switches is operated, by a switch operation of an operator or by a sensor output which automatically detects the brightness of the outside world. A lighting device for a large construction machine, comprising lighting prohibiting means for prohibiting the lighting. 6. The hoistway according to claim 1, wherein the hoistway includes a step, a rudder, or a catwalk on the way, and the illuminating light is located at a position to individually illuminate the step, the rudder, or the catwalk. A lighting device for a large construction machine, wherein the lighting device is arranged.