JPS6345401Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a work vehicle having two wiper devices.

Figure 1 shows an example of a work vehicle in which traveling and crane work are carried out from the same operator's cab. Since the direction in which the driver looks (upwards) and the direction in which the driver looks while driving (forward and horizontal) are different, the two wiper devices wipe different areas, and the wiped areas of both wiper devices partially overlap. In some cases, it is necessary to prevent the two from interfering with each other.

The present invention avoids such interference by controlling the operation of the wiper arm to be driven only when the other wiper arm is at the end of the wiping area of the other wiper arm at a position where it does not interfere.

Next, the configuration of the present invention will be explained in detail based on one specific embodiment.

1 and 2 are electric motors for driving separate wiper devices. 3 are these electric motors 1 and 2
4 is a power source for controlling the current from this power source 3.

5 is a relay R ₁ , and this relay R ₁ 5 is located in parallel with the electric motor 1 . Therefore, while the electric motor 1 is being driven, it is always excited.

6 is a switch, and this switch 6 is located on the a side when the wiper arm A on the electric motor 1 side is located at the end of the wiping area indicated by A in FIG. When it is away from the ground, it is switched to the b side, which is the ground side. 7 is
This wiper selection switch is switched to the a side and the b side, and the a side and the b side correspond to drive electric motors 1 and 2, respectively.In particular, when connected to the a side, this wiper selection switch 7 The relay R ₂ 8 connected in series with is energized, and this energization connects the C contact switch 9 of the relay R ₂ 8 to the ground side of the a side, and when the relay R ₂ 8 is de-energized, The C contact switch 9 of this relay R ₂ 8 is located on the b side. 10 is a relay R ₃ , and this relay R ₃ 10 is located in parallel with the electric motor 2 . Therefore, while the electric motor 2 is being driven, it is always excited. 11 is a b contact switch of relay R ₃ 10;
When R ₃ 10 is energized, ie when the electric motor 2 is being driven, it is positioned in series with the electric motor 1 to prevent the electric motor 1 from being driven. 12 is a b contact switch of the aforementioned relay R ₁ 5, which prevents the electric motor 2 from being driven when the relay R ₁ 5 is energized, that is, when the electric motor 1 is being driven. In order to do this, it is placed in series with the electric motor 2. 13
is a switch, and this switch 13 is located on the a side when the wiper arm B on the electric motor 2 side is located at the end of its wiping area indicated by B in FIG. In the state away from b
It can be switched to the side.

Next, the operation of the present invention will be explained.

First, turn on the power switch 4 and turn the wiper selection switch 7 to side a.

Then, by energizing relay R ₂ 8,
The C contact switch 9 of the relay R ₂ 8 switches to the a side, the electric motor 1 is driven, and the relay
R ₁ 5 is excited, the b contact switch 12 of the relay R ₁ 5 is turned off, and the electric motor 2 is not driven. Then, when the wiper arm A is not at its end A while the electric motor 1 is being driven, and the wiper selection switch 7 is put in the b side, the switch 6 is in the b side and the relay
Since the C contact 9 of R ₂ 8 is switched to the b side, the relay R ₁ 5 is still in the energized state, the driving state of the electric motor 1 remains unchanged, and the b contact switch 12 of the relay R ₁ 5 remains OFF. Therefore, the electric motor 2 is not driven. Then, when the wiper arm A reaches its end A, the switch 6 is set to the A side, and power supply to the electric motor 1 and the relay R ₁ 5 is stopped. This also turns on the b contact switch 12 of relay R ₁ 5, and relay R ₃ 10
By the excitation, the b contact switch 11 of the relay R ₃ 10 of the power supply circuit to the electric motor 1 is turned off, the electric motor 2 is driven, and the wiper arm B performs a swinging motion. Furthermore, when the wiper selection switch 7 is operated, the relay
In order to reliably prevent relay R ₃ 10 from being energized before C contact switch 9 of R ₂ 8 switches to the b side, a capacitor 1 is installed after relay R ₁ 5.
4, the C contact switch 9 of relay R ₂ 8 will remain connected to capacitor 1 even while it is between a and b.
This can be prevented since the relay R ₁ 5 does not become de-energized due to the accumulation of electricity in the relay R 1 5, and the b contact switch 12 of the relay R ₁ 5 remains OFF. In order to prevent the electric motor 1 from storing electricity in the capacitor 14, a diode 15 may be inserted as shown in FIG. 2.

Next, when the wiper selection switch 7 is switched back to the original side a while the wiper arm B is not at its end position, the switch 13
is on the b side, the electric motor 2 continues to be driven, and the relay R ₃ 10 continues to be energized. Therefore, the b contact switch 11 of the relay R ₃ 10 remains OFF, and the wiper arm A does not move. When the wiper arm B reaches its end, the switch 13 moves to the a side, the relay R ₃ 10 becomes de-energized, the b contact 11 of the relay R ₃ 10 turns on, and the wiper arm A turns on. While the wiper arm B starts moving, it stops at its end.

As described above, in the present invention, the two wiper arms start swinging only when the other wiper arm is at the end of the wiping area where they do not interfere with each other. The effect is great.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of two wiper arms, and FIG. 2 is an electric circuit diagram showing one embodiment of the present invention. 1, 2: Electric motor, A, B: Wiper arm, 7: Wiper selection switch, 11: Relay
_R3 B contact switch, 12: Relay _R1 B contact switch, 6, 13: Switch.

Claims (1)

[Scope of utility model registration request] Two wiper devices each equipped with an electric motor and a wiper arm driven by the electric motor.
In a work vehicle arranged so that each wiping area partially overlaps, a wiper selection switch for selectively supplying power to one of these electric motors is provided, and a drive circuit for each electric motor is installed. Inside, power is supplied to each electric motor in the ON state, and while power is being supplied to the other electric motor,
A relay switch is provided in the drive circuit of each electric motor to supply power to the drive side of the electric motor when the wiper arm is not at the end of its wiping area, regardless of the position of the wiper selection switch. A work vehicle equipped with two wiper devices, characterized in that a switch is provided to set the wiper device to the wiper position.