JPH08104169A - Lighting system for step for getting-on/off vehicle for work - Google Patents

Abstract

PURPOSE: To permit the getting-on/off of an operator in safety, by putting on an illuminating lamp by the output of a door interlocked switch for detecting the opening of the door of a operator's cab, when the operator gets off the operator's cab in the night work by a working vehicle and illuminating the periphery of a step for getting-on/off. CONSTITUTION: In the night work by a shiftable crane, a main switch 10 interposed in series with a switch means 8 is closingly operated in the carrying- current circuit for an illuminating lamp 5. When an operator gets off from a driver's room, a door interlocked switch 7 detects the opening of the door of the driver's room and is operated, and the illumination lamp 5 is put on, and the periphery of a step for getting-ON/OFF is illuminated. While, when the operator gets on the driver's room, an approach sensor 6 detects the approach of the operator to the step and is operated, and the illuminating lamp 5 is put ON. The approach sensor 6 is installed on a turning board or at the proper place of the vehicle, and installed so as to detect the approach of the operator to the step or the approach to a portable oscillator carried by the operator.

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 step for getting on and off a work vehicle such as a mobile crane.

[0002]

2. Description of the Related Art A working vehicle such as a mobile crane is shown in FIG.
As shown in FIG. 1, a swivel base 2 mounted on the vehicle 1 so as to freely swivel.
A working cab 2a is mounted on the top. For this reason, this type of work vehicle is equipped with a step 4 for getting on and off, which is used when a worker (a crane operator) gets on and off the ground from the ground to the operator's cab 2a, at a high position. It is possible to get on and off without difficulty in the driver's cab 2a.

In the cab 2a of this type of working vehicle, an interior light (not shown) is lit when the door of the cab 2a is opened.
Is attached, and when the worker gets on and off the operator's cab 2a at night, the step 4 for getting on and off is confirmed by the illumination of the interior light.

[0004]

However, there is a problem in that the interior light cannot sufficiently illuminate the area around the boarding / alighting step 4. In addition, the worker is in the cab 2a
Since the door of the driver's cab 2a is normally closed when getting off the vehicle, when the worker tries to board the operator's cab 2a, the interior light in the operator's cab 2a is turned off. Cannot be turned on unless the driver's cab 2a door is opened by climbing the passenger's cab 2a. Therefore, when the worker is boarding the operator's cab 2a, the passenger's cab 4 must be checked by hand. There was a problem that it was dangerous.

According to the present invention, it is possible to sufficiently illuminate the area around the boarding / alighting step 4 when a worker gets on and off the driver's cab 2a, and moreover, when the worker gets on and off the driver's cab 2a, it is turned on in advance to get on and off. It is an object of the present invention to provide an illuminating device for a step for getting on and off a work vehicle capable of sufficiently illuminating the surroundings of the operation step 4.

[0006]

In order to achieve the above-mentioned object, the illuminating device for the step of getting on and off the working vehicle according to the present invention is constructed as follows. A working vehicle having a working cab 2a at a high position of the vehicle 1, particularly a step 4 for getting on and off, which is used at the side of the vehicle 1 when getting on and off the ground from the cab 2a. An illuminating device for a step for getting on and off, which is used for a working vehicle, which is attached to the vehicle 1, and an illuminating lamp for illuminating the step 4 for getting on and off, which is attached at an appropriate place for the step 1 for getting on and off the vehicle 1. A proximity sensor that operates by detecting the approach of a worker or a proximity of a portable transmitter carried by the worker, and a door interlock switch that operates by detecting the opening of the door of the cab 2a, The proximity sensor and the door interlocking switch are interposed in the energizing circuit of the illumination light so that the illumination light is turned on when at least one of the proximity sensor and the door interlocking switch is activated. Lighting device ingress-egress step of use vehicle.

[0007]

In the lighting device for the step of getting on and off the working vehicle according to the present invention, which is constructed as described above, when the worker is about to get off the operator's cab 2a to the ground, the door interlocking switch is the door of the operator's cab 2a. Since the opening of the vehicle is detected and activated, the illumination lamp is turned on in advance to illuminate the area around the boarding / alighting step 4. On the other hand, when the worker tries to get into the operator's cab 2a, the proximity sensor operates by detecting the proximity of the worker to step 4 for getting on and off, so that the illumination light is turned on in advance and the step 4 around step 4 for getting on and off Can be illuminated.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an illuminating device for a step for getting on and off a work vehicle according to the present invention will be described below with reference to FIG. 1 as an example applied to a mobile crane. FIG. 1 is an explanatory diagram showing the configuration of the lighting device of the present invention. As shown in FIG. 1, the illuminating device includes an illuminating lamp 5 for illuminating the boarding / alighting step 4, a proximity sensor 6, and a door interlocking switch 7.

The illuminating lamp 5 is mounted at an appropriate place on the swivel base 2a or the vehicle 1, that is, at a position where it can illuminate the area around the boarding / alighting step 4 when it is turned on. As for the mounting position of the illuminating lamp 5, as shown in FIG. 2, either the proper position of the swivel base 2a (the position shown in FIG. 2A) or the proper position of the vehicle 1 (the position shown in FIG. Good to do.

The proximity sensor 6 is attached to the swivel base 2a or an appropriate place of the vehicle 1 to detect the approach of the worker to the step 4 for getting on and off, and to detect the proximity of a portable oscillator carried by the worker or carried by the worker. It works. Proximity sensor 6
Is to detect the approach of the worker to the boarding / alighting step 4, the proximity sensor 6 uses a well-known ultrasonic proximity sensor (the ultrasonic transmitter and the ultrasonic transmitter to transmit the same. A receiver that receives reflected waves that ultrasonic waves reflect back to an object, and that detects the proximity of an object from the time lag between ultrasonic wave transmission and reception), or a proximity sensor that uses infrared rays ( The one that detects the proximity of a person by detecting the infrared rays emitted by the person) is used.

When the proximity sensor 6 detects the proximity of a portable transmitter carried by a worker, the proximity sensor 6 is composed of a radio wave receiver and receives the radio wave transmitted by the mobile transmitter. The one that detects the proximity state of the portable transmitter by the strength is used.

The door interlocking switch 7 detects the opening of the door when the driver's cab 2a is getting on and off.

Reference numeral 8 is a switch means interposed in the energizing circuit of the illuminating lamp 5 and is controlled by an operation signal from the proximity sensor 6 and an operation signal from the door interlocking switch 7. . The switch means 8 is configured to conduct the energizing circuit of the illuminating lamp 5 when receiving an operation signal from at least one of the proximity sensor 6 and the door interlocking switch 7.

As described above, the proximity sensor 6 and the door interlocking switch 7 are arranged so that the illumination lamp 5 is turned on when at least one of the sensors 6 and 7 is activated.
It is installed in the energizing circuit of.

Reference numeral 9 is a timer provided in an operation signal transmission path for transmitting the operation signal of the proximity sensor 6 to the switch means 8. The timer 9 transmits the operation signal of the proximity sensor 6 to the switch means 8 while maintaining the operation signal for a certain period of time. To do. When the timer 9 is attached, the worker or the transmitter carried by the worker can continue to turn on the illumination lamp 5 for a certain period of time even if the worker moves away from the operating range of the proximity sensor 6.

Further, 10 is in the energizing circuit of the illumination lamp 5,
The main switch is provided in series with the switch means 8 and is to be closed during the night work of the mobile crane.

[0017]

[Effects] The lighting device for the step of getting on and off the working vehicle according to the present invention configured as described above is used by closing the main switch 10 during nighttime working of the working vehicle. In the state where the main switch 10 is closed, the door interlocking switch 7 operates by detecting the opening of the door of the driver's cab 2a when the worker tries to get off the driver's cab 2a to the ground. Can be turned on in advance to illuminate the area around the boarding / alighting step 4. On the other hand, when the worker tries to get into the driver's cab 2a, the proximity sensor 6 operates by detecting the proximity of the worker to the step-on / off step 4, so that the illumination lamp 5 is turned on in advance and the step-on / off step is performed. It is possible to illuminate the surroundings. Therefore, there is an effect that a worker can safely get on and off the operator's cab 2a.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an illumination device for a step of getting on and off a work vehicle according to the present invention.

FIG. 2 is an explanatory diagram of a mobile crane as an example of a working vehicle.

[Description of sign]

1; vehicle, 2; swivel base, 2a; cab, 3; boom,
4; step for getting on and off; 5; illumination light; 6; proximity sensor;
7: Door interlock switch, 8: Switch means, 9: Timer, 10: Main switch,

Claims (1)

[Claims] 1. A working vehicle having a working cab at a high position of the vehicle, and in particular, a step for getting on and off which is used at the side of the vehicle when getting on and off the ground from the cab. An illuminating device for a boarding / alighting step used for a working vehicle to be installed, which is an illumination light installed in a proper place of the vehicle to illuminate the boarding / alighting step, and a worker's approach to the boarding / alighting step installed in a proper place of the vehicle And a door interlock switch that operates by detecting the opening of a driver's cab door, and a proximity sensor that operates by detecting the proximity of a portable transmitter carried by a worker A working vehicle rider characterized in that the proximity sensor and the door interlocking switch are interposed in the energizing circuit of the illumination lamp so that the illumination lamp is turned on when at least one of the interlocking switches is activated. Lighting device use step.