JP2915814B2 - Lighting equipment for getting off 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 an illuminating device for a construction machine for illuminating a foot so that a driver can safely get off a construction machine such as a hydraulic shovel after sunset.

[0002]

2. Description of the Related Art Conventionally, in the operation of a construction machine such as a hydraulic excavator, when a driver gets off the construction machine after sunset, the driver can safely get off by checking the state of the ground and the position of steps. For this purpose, it is known to attach a lighting device for illuminating a foot of a getting-off site to a construction machine. For example, an illumination lamp is installed in a cabin door, connected to a battery via a manual switch and a door switch, and is manually turned on, and blinks in synchronization with opening and closing of the door. Are known.

[0003]

However, in this type of conventional lighting device, if the surroundings are bright, such as during the daytime, it is not easy to determine whether or not the get-off light is lit. Often do not notice forgetting. Therefore, not only does the lighting lamp light up needlessly, but also the lighting lamp keeps lighting, so that the battery is discharged, which may hinder later operations.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and is intended to be turned on automatically when a driver gets off a construction machine after sunset. It is to provide a device. According to the present invention, the driver lights up for a certain period of time necessary for the driver to get off the vehicle,
Thereafter, the present invention is to provide a lighting device for getting off a construction machine that can automatically turn off the light and prevent unnecessary lighting of the lighting lamp due to forgetting to turn off the light.

[0005]

According to the first aspect of the present invention, there is provided a first mechanism for detecting a locked position or an unlocked position of a safety lock lever of a construction machine.
A detection device, a second detection device for detecting the brightness around the construction machine, and a control device connected to the first detection device and the second detection device for controlling lighting of the getting-off illumination lamp. In addition, a technical measure is taken such that when the brightness of the surroundings is equal to or less than a predetermined value and the safety lock lever is shifted to the lock position, the lighting of the exit lamp is controlled. According to the second aspect of the present invention, the control device having the above configuration includes:
A technical measure is taken to provide a timer means for controlling the lighting time of the getting-off lamp to a fixed time. Furthermore,
According to the third aspect of the present invention, the first detecting means comprises a detecting switch for detecting a locked position or an unlocked position of the safety lock lever, the second detecting means comprises a photoconductive cell, and the control device uses a vehicle-mounted battery as a power source. An illumination circuit for controlling lighting of a get-off illumination lamp connected in series to the first contact and the second contact, wherein when the detection switch detects the locked position of the safety lock lever,
A first relay for closing a contact; a photoconductive cell circuit including a second relay for closing a second contact of the lighting circuit when a brightness below a certain level is detected in the photoconductive cell; When the locked position of the safety lock lever is detected, a timer relay for closing the third contact connected to the photoconductive cell circuit for a fixed time is provided.

[0006]

According to the first aspect of the present invention, the illumination light is turned on when the surrounding brightness is equal to or less than a predetermined value and the safety lock lever is shifted to the lock position, so that the illumination light may be turned on in daylight. There is no. According to the second aspect of the present invention, the provision of the timer means enables the illumination lamp to be turned off automatically after being turned on for a certain period of time, thereby preventing unnecessary lighting of the illumination lamp and discharge of the battery due to forgetting to turn off as in the conventional case. be able to. Further, in the invention according to claim 3, when the detection switch detects the locked position of the safety lock lever, the first contact of the lighting circuit is closed by the first relay,
The third contact is closed by the timer relay for a predetermined time. When the third contact is closed and the known brightness is detected below a certain level by the photoconductive cell, the photoconductive cell circuit is activated and the second relay is closed by the second relay. As a result, the first and second contacts are closed, so that the illumination lamp is turned on. After a certain period of time, the third contact is opened by the timer relay, the photoconductive cell circuit is turned off, and the second
The relay opens the second contact and turns off the illumination lamp.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a lighting device for a construction machine according to the present invention will be described below with reference to the drawings. FIG. 1 is a diagram schematically showing an example in which a lighting device for alighting a construction machine according to the present invention is applied to, for example, a hydraulic shovel.
11 is a suspension device such as a crawler, and 12 is a suspension device 11
The cab 13 is rotatably supported by the cab, 13 is a console, 14 is a safety lock lever for temporarily locking an operation lever of a hydraulic shovel, and 15 is a lighting lock device for getting off disposed near a lower portion of the safety lock lever 14. It is a control device.

The control device 15 includes a photoconductive cell circuit 1
6, a first relay 17 and a second relay 18, a timer relay 19 and the like are provided, and are also connected to a limit switch 20 for detecting a displacement of the safety lock lever 14. A photoconductive cell 21 using cadmium sulfide or the like is provided on the lower side surface of the cab 12.
An illumination light 22 for illuminating the foot is mounted below the entrance of the vehicle, and the photoconductive cell 21 and the illumination light 22 are connected to the control device 15 of the illumination device.

FIG. 2 shows an example of the lighting circuit C of the control device. The lighting circuit C includes a first circuit C1 provided with a first relay 17 and a timer relay 19 which are activated by detection of a limit switch 20 in a vehicle-mounted battery 23 serving as a power supply, and a photoconductive cell circuit having a photoconductive cell 21. A second circuit C2 including a first relay 17 and a second relay 1 on the power supply side and having a third contact opened and closed by the timer relay 19;
A third circuit C3 having an illuminating light 22 connected in series to a first contact R1 and a second contact R2 opened and closed by a switch 8 is connected in parallel.

That is, the limit switch 2 of the first circuit C1
Reference numeral 0 denotes an example of a detecting means for detecting the shift position of the safety lock lever 14. When the safety lock lever 14 is at the unlocked position shown in the drawing, the NC contact of the limit switch 20 is closed. Then, the timer relay 19 is excited, and the third contact T1 is closed.

Since the NO-side contact of the limit switch 20 opens, the first contact R1 of the first relay 17 opens.
Therefore, since the first contact R1 of the third circuit C3 is opened, the illumination lamp 22 remains off.

After the operation is completed, when the driver operates the safety lock lever 14 to the locked position, the limit switch 2
Since the NO-side contact of 0 is closed, the first relay 17 is excited and the first contact R1 is closed. At the same time,
Although the contact on the NC side of the limit switch 20 is opened, the timer operation is started while the third contact T1 of the timer relay 19 is closed. Then, while the third contact T1 is closed, the photoconductive cell circuit 16 is energized.

When the surroundings are bright, such as in the daytime, the photoconductive cell 21 has a small resistance value and a current flows therethrough.
6 does not operate, but when the surroundings become darker than a certain level, such as at night, the resistance value of the photoconductive cell 21 increases and current stops flowing, and the photoconductive cell circuit 16 becomes operable. Then, as described above, the third contact T1 is closed, and the second relay 18 is excited by the energization of the photoconductive cell circuit 16, and the second contact R2 is closed.

Thus, the first contact R1 of the third circuit C3
And the second contact R2 is closed and the illumination lamp 22 is turned on.
Therefore, only when the safety lock lever 14 is in the locked position and the surroundings become darker than a certain level such as at night and the photoconductive cell circuit 16 operates, the illuminating lamp 22 is turned on.

When the timer set time of the timer relay 19 has passed, the third contact T1 of the timer relay 19 is set.
Is opened, the photoconductive cell circuit 16 is not energized, and OF
The state becomes F, the second contact R2 of the second relay 18 opens, and the illumination lamp 22 is automatically turned off. It should be noted that a well-known timer means can be appropriately employed in place of the timer relay 19, and the timer setting time can be arbitrarily set or adjusted in advance as needed.

As a result, the operator of the hydraulic excavator finishes the work after evening or sunset, and moves the safety lock lever 14 from the unlocked position (shown by a broken line in FIG. 1) to the locked position (in order to prevent the operation lever from malfunctioning). (Indicated by a solid line in FIG. 1), the lighting lamp 22 is automatically turned on from the moment the shift operation is performed, illuminating a place for dismounting, and when the operator disembarks in the dark surroundings, the feet are bright and the ground conditions and steps You can get off safely while checking the location of the vehicle.

In the above embodiment, a hydraulic excavator is exemplified as an example of a construction machine. However, it is needless to say that any construction machine having a safety lock lever can be applied regardless of its type. Further, the sensor for detecting the shift position of the safety lock lever may be a contact type or a non-contact type, that is, any sensor that can detect the lock position and / or the unlock position may be used. Furthermore,
In the above-described embodiment, a configuration is used in which the illumination time is kept constant by using a timer relay or the like, but in the present invention, a light-off means is separately provided, and a sensor that detects the shift position of the safety lock lever and the surrounding brightness is used. Then, the configuration may be such that the getting-off illumination lamp is turned on.

[0018]

According to the present invention, after work is completed,
Use the lock position of the safety lock lever to prevent malfunctions that must be operated for safety, and use the detection means that operates by sensing the surrounding brightness, when the surroundings are dark below a certain level, and When the two conditions when the safety lock lever is in the lock position are satisfied, the exit light can be turned on. In addition, by using a timer, for a certain period of time required for getting off, the lighting for getting off automatically is turned on, and then automatically turned off,
This is extremely useful because it is possible to reliably prevent unnecessary lighting of the illumination lamp and discharge of the battery due to forgetting to turn off the light as in the related art.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing an application example of a lighting device for a construction machine according to the present invention.

FIG. 2 is a diagram showing a circuit configuration of a lighting device for alighting a construction machine according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 ... Cab 14 ... Safety lock lever 15 ... Control device 16 ... Photoconductive cell circuit 17 ... 1st relay 18 ... 2nd relay 19 ... Timer relay 20 ... Limit switch 21 ... Photoconductive cell 22 ... Exit light 23 ... Battery R1: first contact R2: second contact T1: third contact

Claims (3)

(57) [Claims] A first detecting means for detecting a locked position or an unlocked position of a safety lock lever of the construction machine; a second detecting means for detecting brightness around the construction machine; 2 is connected to the detecting means and controls the lighting of the get-off lighting lamp. When the surrounding brightness is below a certain level and the safety lock lever is shifted to the locked position, the A lighting device for dismounting a construction machine, which controls lighting of a lighting lamp. 2. The illuminating device for a construction machine according to claim 1, wherein the control device is provided with timer means for controlling a lighting time of the illuminating lamp for a dismounting lamp to a predetermined time. 3. The first detection means comprises a detection switch for detecting a locked position or an unlocked position of a safety lock lever, the second detection means comprises a photoconductive cell, and the control device uses a vehicle-mounted battery as a power source and the first Contact and second
A first relay for closing a first contact of the lighting circuit when the detection switch detects a locked position of a safety lock lever, the lighting circuit comprising: a lighting circuit for controlling lighting of a get-off lighting lamp connected in series to the contact; A photoconductive cell circuit having a second relay that closes a second contact of the illumination circuit when the brightness of the photoconductive cell is detected to be equal to or less than a certain value; and a fixed value when the lock position of the safety lock lever is detected by the detection switch. 3. The lighting device according to claim 2, further comprising: a timer relay for closing a third contact connected to the photoconductive cell circuit for a time.