JPH10129341A - Lighting device for work lights for vehicles - Google Patents

Abstract

(57) [Summary] [Problem] To turn on a work light only when the vehicle is stopped, turn off the light at the same time as running, and do not turn on the work light until the light switch is operated again. Get the device. A vehicle has a control circuit for controlling a work light.
Is provided. The control circuit 13 includes a lighting switch 16 for turning on the work lamp 12 in an on state, and a lighting switch 16 for turning on the work lamp 12 in an off state.
Switch 17 for turning off the light, a parking switch 18 that is turned on when the parking brake is in operation and turned off when it is inoperative, and a light switch when the on state of the parking switch 18 is added to the on state of the light switch 16. A self-holding circuit is provided which keeps the lighting state of the work light even when the switch is turned off, and releases the holding when the parking switch or the light-off switch is turned off to turn off the work light.

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 work light for a vehicle, which is provided with a control circuit for controlling a work light mounted on a vehicle and illuminating a carrier.

[0002]

2. Description of the Related Art Heretofore, there has been known a vehicle having a carrier such as a truck provided with a work light in order to improve workability at night. In such a vehicle, even at night or in the daytime, it is lit at the time of work in a dim place such as work indoors, thereby illuminating the loading platform and the work place near the vehicle, thereby ensuring the workability and safety of workers. You can do it. Such a work light is normally turned on by a power supply from a battery provided in the vehicle, and is turned off by shutting off the power supply by a manual switch when not in use.

[0003] However, when the turning on and off of the work lamp is controlled only by the manual switch in this way, the state where the work lamp is turned on may be maintained due to the worker forgetting to turn off the light. If the user forgets to turn off the work light, the battery will be consumed, and traveling of the vehicle with the work light turned on will be annoying to the driver of the following vehicle.

In order to solve this problem, as shown in FIG. 6, a work lamp 6 is connected to an output terminal of a parking switch 3 for controlling lighting of the parking lamp 2 via a work lamp switch 4.
And a lighting device for a working lamp for a vehicle, which is capable of lighting the working lamp 6 only when the parking lamp 2 is turned on (Japanese Utility Model Application Laid-Open No. 54-2884).
4). In the lighting device configured as described above, even if the worker forgets to turn off the work light 6, the parking switch 3 is turned off by releasing the parking brake to run the vehicle, and the power supply circuit to the work light 6 is shut off. As a result, the work light 6 is turned off, and a problem caused by the vehicle running with the work light 6 turned on can be eliminated.

[0005]

However, in the above-described conventional lighting device for a work light for an automobile, the work light 6 can be turned off by releasing the parking brake, but when the parking brake is operated again, the work light is turned on. 6 still lights up again and still has a problem to be solved. That is, the work light 6 is not turned on even when the vehicle is running with the work light switch 4 turned on. However, when the driver temporarily activates the parking brake in a state where the vehicle is temporarily stopped at a traffic light or a railroad crossing, the parking is stopped. There is a problem that the switch 3 is turned on and the work lamp 6 is turned on again. SUMMARY OF THE INVENTION An object of the present invention is to provide a lighting device for a work light for a vehicle, which permits lighting of the work light only when the vehicle is stopped, turns off the light at the same time as traveling, and does not turn on the work light until a switch for lighting is operated again. Is to do.

[0006]

The invention according to claim 1 is
As shown in FIGS. 1 and 5, the present invention is an improvement of a lighting device for a work light for a vehicle including a control circuit 13 for controlling a work light 12 attached to a vehicle 11. The characteristic configuration is that the control circuit 13 is turned on when the work light 12 is turned on in the on state, turned off when the work light 12 is turned off in the off state, and turned on when the parking brake is activated. When the ON state of the parking switch 18 is added to the ON state of the parking switch 18 when the ON state of the parking switch 18 is added to the ON state of the lighting switch 16, the lighting state of the work light 12 is maintained even when the lighting switch 16 is OFF. A self-holding circuit 21 is provided to release the holding when the parking switch 16 or the light-off switch 17 is turned off and to turn off the work light 12.

In the lighting device for a working light for a vehicle according to the first aspect, when the ON state of the parking switch 18 is added to the ON state of the lighting switch 16, the self-holding circuit 21 is turned on even if the lighting switch 16 is turned OFF. The lighting state of the work lamp 12 is maintained. On the other hand, the self-holding circuit 21 releases the lighting state of the work light 12 and turns off the work light 12 when the parking switch 16 or the light-off switch 17 is off.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings. As shown in FIG. 5, a work bed 12 is provided on a bed 11a of a truck 11, which is a vehicle, to improve workability at night. Work light 12
Is attached to the torii 11b of the loading platform 11a toward the rear downward, and lights up to illuminate the loading platform 11a and the work place near the truck 11, thereby improving the workability and safety of the worker in a dark place such as at night or indoors. Is to be secured. The vehicle 11 is provided with a control circuit 13 (FIG. 1) for controlling the work light 12 attached in this manner, and the control circuit 13 controls turning on and off of the work light 12.

As shown in FIG. 1, the control circuit 13 includes a lighting switch 16, a lighting switch 17, a parking switch 18, and a self-holding circuit 21. The lighting switch 16 is a normally open manual operation automatic reset type switch, and is connected in series to the work light 12. Light switch 1
Reference numeral 7 denotes a normally closed manual operation automatic reset type switch, which is connected in series between the lighting switch 16 and the work lamp 12. The parking switch 18 is provided on a parking lever (not shown). The parking switch 18 is turned on when the parking lever (not shown) is operated by pulling the parking lever, and is returned when the parking lever is returned and the parking brake is inoperative. It is configured to turn off.

The self-holding circuit 21 includes first and second electromagnetic relays 22 and 23. The first electromagnetic relay 22 is a normally open first contact 22a connected in parallel to the lighting switch 16, and the first contact 22a. And a first coil section 22b for exciting the first coil section. One end of the first coil portion 22b is connected to the switch 17 for turning off the light.
And the work light 12. The second electromagnetic relay 23 has a normally open second contact 23a having one end connected to the other end of the first coil portion 22b, and a second coil portion 23b for exciting the second contact 23a. The second coil portion 23b is connected in series between the parking switch 18 and the battery 24, and the other end of the second contact 23a is connected to the second coil portion 23b and the battery 2
4 are connected. In addition, a diode 26 for preventing a current from flowing from the work lamp 12 to the parking switch 18 is connected to one end of the first coil portion 22b. Reference numeral 27 denotes a parking lamp that calls the driver's attention while the parking brake is operating.

The operation of the lighting device of the vehicle work light 12 thus configured will be described with reference to FIGS. (a) Operation During Vehicle Travel (FIG. 1) In this state, the parking switch (not shown) is inactive, so that the parking switch 18 is off, and the first and second electromagnetic relays 22, 23 are Since no current flows through the coil portions 22b and 23b, the first and second contacts 22a and 23a maintain the off state. The manual operation automatic reset type lighting switch 16 is maintained in the OFF state without manual operation by the driver, and the work light 12 is maintained in the OFF state.

(B) Operation when the vehicle is stopped (FIG. 2) When the vehicle is stopped, the driver activates the parking brake. For this reason, the parking switch 18 is turned on to turn on the parking lamp 27, and at the same time, a current flows through the second coil portion 23b of the second electromagnetic relay 23 to excite the second contact 23a to be turned on. However, the lighting switch 16 of the manual operation automatic return type is maintained in the off state until the driver manually operates the work light 12.
Keep the light-off state.

(C) Operation of turning on the work light 12 (FIG. 3) In order to turn on the work light 12 with the vehicle stopped, the driver manually operates the parking switch 18 while keeping the parking switch 18 on. The lighting switch 16 is turned on as shown by the solid line. When the lighting switch 16 is switched to the ON state, a current flows to the work lamp 12 via the normally closed light-extinguishing switch 17, and the work lamp 12 is turned on. At the same time, a current flows from the second contact 23a in the ON state through the first coil portion 22b to the lighting switch 16 side, as indicated by the arrow in the figure, and the first contact 22a of the first electromagnetic relay 22 is turned on. It is excited and turned on. For this reason,
Even if the driver terminates the operation and makes the lighting switch 16 self-reset as shown by the broken line in the figure to turn it off, the first
Since the contact 22a keeps the ON state, the current continues to flow through the work lamp 12, and the lighting state of the work lamp 12 is maintained.

(D) Operation of turning off the work light 12 (FIG. 4) To turn off the work light 12 from the lit state, the driver manually turns off the normally closed light switch 17. When the light-off switch 17 is turned off, the current circuit of the work light 12 is opened, and the work light 12 is turned off.
Turns off. At the same time, the current flowing through the first coil portion 22b is also cut off, and the first electromagnetic relay 22
The contact 22a is turned off. Therefore, even if the driver terminates the operation and self-returns the light-extinguishing switch 17 as shown by the dashed line in the figure to turn it on, the first contact 22a and the lighting switch 16 remain off. In this case, the work lamp 12 is kept off.

(E) When the vehicle is driven with the work light 12 turned on (FIGS. 1 and 3) In order to run the vehicle from the state shown in FIG. 3, the parking brake (not shown) is inoperative. , The parking switch 18 is turned off. As shown in FIG.
When the parking switch 18 is turned off, no current flows through the second coil portion 23b, and the second contact 23a is turned off. When the second contact 23a is turned off, the current to the first coil portion 22b is cut off and the first contact 22a is turned off.
Switches to the off state. As a result of the lighting switch 16 being kept in the off state, the work lamp 12 is released from being held and turned off when the first contact point 22a is in the off state.

That is, the self-holding circuit 21 has the above-described (a) to
By operating as shown in (e), the lighting switch 16
When the ON state of the parking switch 18 is added to the ON state of the vehicle, the work light 12 is turned on even if the lighting switch 16 is turned OFF.
, And release the holding when the parking switch 18 or the extinguishing switch 17 is in the off state, and
Turn off the light.

[0017]

As described above, according to the present invention, the control circuit includes a lighting switch for turning on a work light in an on state, a light-off switch for turning off a work light in an off state, and a parking brake. The self-holding circuit includes a parking switch that is turned on in an operating state and turned off in a non-operating state, and the self-holding circuit turns off the lighting switch when the on state of the parking switch is added to the on state of the lighting switch. Even so, the lighting state of the work light is maintained, and the holding is released in the off state of the parking switch or the light-off switch to turn off the work light. As a result, in the lighting device for a work light for a vehicle according to the present invention, the lighting of the work light is permitted only when the vehicle is stopped, and the work light is not turned on until the light is turned off at the same time as traveling and the lighting switch is operated again.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a lighting device for a work light for a vehicle including a control circuit according to an embodiment of the present invention.

FIG. 2 is a diagram corresponding to FIG. 1 in a state where a parking brake of the vehicle is operated.

FIG. 3 is a diagram corresponding to FIG. 1 in which a lighting switch of the vehicle is turned on.

FIG. 4 is a view corresponding to FIG. 1 in which a light-off switch of the vehicle is turned off.

FIG. 5 is a side view of a vehicle provided with the device.

FIG. 6 is a configuration diagram of a conventional control device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Vehicle 12 Work light 13 Control circuit 16 Lighting switch 17 Lighting switch 18 Parking switch 21 Self-holding circuit

Claims (1)

[Claims] 1. A lighting device for a work light for a vehicle, comprising a control circuit (13) for controlling a work light (12) attached to a vehicle (11), wherein the control circuit (13) is turned on when the control circuit (13) is turned on. A lighting switch (16) for turning on the work light (12), and a light-off switch for turning off the work light (12) in an off state
(17), a parking switch (18) that is turned on when the parking brake is in operation and is turned off when not in operation, and an on state of the parking switch (18) when the lighting switch (16) is on. When added, the lighting switch (1
6) Even if the work light (12) is in the off state, the lighting state of the work light (12) is maintained, and the holding is released in the off state of the parking switch (18) or the light-off switch (17) to release the work light (12). )
And a self-holding circuit (21) for extinguishing the work light.