JPH1017299A - Safety device of rorklift - Google Patents

Abstract

PROBLEM TO BE SOLVED: To give a warning to a driver on advance operation of an accelerator lever in a condition where a fork height is in the lowest position and a tilt angle inclines forward by providing a control device to actuate an annunciator. SOLUTION: An accelerator lever 6 and a cargo handling operation lever 7 are arranged on a car body of a forklift. A lifting height detecting means 14 to detect a fork height is installed in a mast part, and a tilt angle detecting means 17 is installed on a lift bracket. When a signal in the advance direction of the accelerator lever 6, a signal to show that a fork height from the lifting height detecting means 14 is in the lowest position and a signal to show that a tilt angle from the tilt angle detecting means 17 inclines forward are simultaneously inputted, a voice annunciator 23 or a display annunciator 24 is actuated by a controller 25 arranged on the car body, and a driver is informed of the fact that it is dangerous since the tip of a fork hitches on a projection-recess of a road surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a forklift for informing a driver that, when the accelerator lever is operated in a forward direction, the tip of the fork of the forklift is caught by unevenness of a road surface and is dangerous. It concerns safety devices.

[0002]

2. Description of the Related Art A conventional forklift travels normally with no warning and no forward warning when the fork height is at the lowest position and the tilt angle is forward. Was.

[0003]

In the conventional forklift, when the fork height is at the lowest position and the tilt angle is forward, the accelerator lever is moved.
When the forklift is operated in the forward direction, there arises a problem that the tip of the fork of the forklift may be caught on unevenness of the road surface, which is dangerous.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a fork lift having a fork height detecting means for detecting a fork height and a tilt angle detecting means for detecting a tilt angle. With the output signal of the lift detecting means for detecting that it is at the lower position and the output signal of the tilt angle detecting means for detecting that the tilt angle is forward tilting, the accelerator lever is released. The above-mentioned problem has been solved as a configuration including a control device that operates an alarm that informs a driver that the tip of a fork of a forklift is caught by unevenness of a road surface when operated in a forward direction. It is.

[0005]

The forklift is provided with a lift detecting means for detecting the fork height and a tilt angle detecting means for detecting that the tilt angle is forwardly inclined, and the fork lift detects the fork height. Is the lowest height (the height at which the lower surface of the fork is in contact with the road surface), that is, the fork height is at the lowest position, and the tilt angle is detected. If the tilt angle is detected to be forward tilt by the means, and the accelerator lever is operated in the forward direction in a state where both detection signals are applied to the control device, the tip of the fork is detected by the sound alarm. The driver can be informed of the danger of being caught in the unevenness by voice, or the driver can be informed of the above-mentioned danger by displaying a character or a graphic with a display alarm.

[0006]

Other features In a forklift having a fork height detecting means for detecting a fork height and a tilt angle detecting means for detecting a tilt angle, detecting that the fork height is at the lowest position. When the accelerator lever is operated in the forward direction in a state where the output signal of the tilt height detecting means and the output signal of the tilt angle detecting means for detecting that the tilt angle is tilted forward are applied, the forehead is lowered. It is also possible to provide a control device that activates an alarm that informs the driver that the tip of the fork of the lift is caught on unevenness of the road surface and that the driver is in danger, and also transmits a deceleration signal to the travel control device.

[0007]

The forklift is provided with a lift detecting means for detecting a fork height and a tilt angle detecting means for detecting that the tilt angle is forwardly inclined. To detect that the fork height is at the lowest position, and that the tilt angle detecting means detects that the tilt angle is forward tilt, and that both detection signals are applied to the control device. When the accelerator lever is operated in the forward direction, the tip of the fork is caught by unevenness on the road surface and the driver is informed of the danger by a voice alarm, and at the same time, the travel control device is switched to deceleration and the vehicle falls. It is intended to contribute to high safety by preventing accidents.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a forklift safety device according to the present invention (hereinafter referred to as the present invention) will be described with reference to FIG. The lift bracket 4 is disposed on the mast 3 so as to be movable up and down, and a pair of left and right forks 5 are locked to the lift bracket 4. The forklift 1 has an accelerator lever 6 for determining a traveling direction and a traveling speed, and a loading operation lever 7 for moving the fork 5 up and down and tilting. It is attached to.

The accelerator lever 6 is provided with an accelerator lever.
The running direction and the running speed are controlled by the direction and the angle at which the vehicle 6 is tilted. When the loading operation lever 7 is tilted in a predetermined direction, the micro switch 8 mounted near the loading operation lever 7 is actuated, and the hydraulic motor 9 starts rotating. The pipe 1 to which the valve stem 11 of the switching valve 10 attached to the end of the lever 7 is moved and connected.
2 is switched, the pressurized oil is supplied to the cargo handling cylinder 13 through the pipeline 12, and the cargo handling cylinder 13 performs a predetermined operation.

A lift detecting means 14 for detecting that the fork height is at the lowest position is provided with a limit switch 15 attached to the mast 3 at a fixed height from the traveling road surface. Is the limit switch 1
The tog 16 which keeps pushing the button 5 at the lowest position is fixed. The tilt angle detecting means 17 is (for this embodiment, a contact-type forklift is assumed.
A means for detecting the tilt angle of the fork 5 when the fork 5 is tilted back and forth will be described), and a shaft 18 for rotatably supporting the fork 5 is provided on the upper part of the lift bracket 4. A bracket 20 to which the rotary position detector 19 is fixed is penetrated and supported, and a cylindrical body 22 made of a rubber body which is in contact with the member surface of the fork 5 is fixed to a rotation shaft 21 of the rotary position detector 19. -K5
Tilting operation rotates the cylindrical body 22, and the rotary position detector 19 can detect the tilt angle.

An accelerator lever 6, a loading operation lever 7 disposed on the body 2 of the forklift 1, a height detecting means 14 mounted on the mast 3, and a tilt angle detecting means 17 mounted on the lift bracket 4. The signals are applied to the accelerator lever 6 in the forward direction, a signal indicating that the fork height from the lift detecting means 14 is at the lowest position, and a signal from the tilt angle detecting means 17. When a signal indicating that the tilt angle of the forklift 1 is tilted forward is input at the same time, the tip of the fork 5 of the forklift 1 is caught on unevenness of the road surface to inform the driver that there is a danger. A control device 25 for operating the display 23 or the display alarm 24 is provided in the vehicle body 2.

An accelerator lever 6, a cargo handling lever 7 disposed on the body 2 of the forklift 1, a height detecting means 14 mounted on the mast 3, and a tilt angle detecting means 17 mounted on the lift bracket 4. The signals are applied to the accelerator lever 6 in the forward direction, a signal indicating that the fork height from the lift detecting means 14 is at the lowest position, and a signal from the tilt angle detecting means 17. When a signal indicating that the tilt angle of the forklift 1 is tilted forward is input at the same time, the tip of the fork 5 of the forklift 1 is caught on unevenness of the road surface to inform the driver that there is a danger. A control device 25 for operating the display 23 or the display alarm 24 and decelerating the same at the same time is provided in the vehicle body 2.

As described above, the present invention relates to a forklift having a fork height detecting means for detecting a fork height and a tilt angle detecting means for detecting a tilt angle. The accelerator lever is moved forward with the output signal of the lift detecting means for detecting that the vehicle is at the position indicated by the arrow and the output signal of the tilt angle detecting means for detecting that the tilt angle is tilted forward. Operating in the direction,
The forklift is provided with a control device that activates or decelerates the forklift to notify the driver that the tip of the fork is caught by the unevenness of the road surface and that there is a danger. The risk of getting stuck on the irregularities can be avoided.

[Brief description of the drawings]

FIG. 1 shows a side view of a forklift.

FIG. 2 shows a side view of the cargo handling lever.

FIG. 3 shows a side view of the lift detecting means.

FIG. 4 shows a side view of the tilt angle detecting means.

FIG. 5 shows a block diagram of a control device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Forklift 2 Body 3 Mast 4 Lift bracket 5 Fork 6 Accelerator lever 7 Loading lever 14 Lift height detecting means 17 Tilt angle detecting means

Claims (4)

[Claims] 1. A forklift having a fork height detecting means for detecting a fork height and a tilt angle detecting means for detecting a tilt angle, detects that the fork height is at the lowest position. When the accelerator lever is operated in the forward direction in a state where the output signal of the tilt height detecting means and the output signal of the tilt angle detecting means for detecting that the tilt angle is tilted forward are applied, the forehead is lowered. Clift Fore
A safety device for a forklift, comprising a control device for activating an alarm which informs a driver that the tip of a fork is caught by unevenness of a road surface and is dangerous. 2. A forklift having a fork height detecting means for detecting a fork height and a tilt angle detecting means for detecting a tilt angle, detecting that the fork height is at the lowest position. When the accelerator lever is operated in the forward direction in a state where the output signal of the tilt height detecting means and the output signal of the tilt angle detecting means for detecting that the tilt angle is tilted forward are applied, the forehead is lowered. Clift Fore
A safety device for a forklift comprising a control device that activates an alarm that informs a driver that the tip of a fork is caught by unevenness of a road surface and is dangerous and that also transmits a deceleration signal to a traveling control device. 3. An alarm according to claim 1 or 2, wherein the alarm is a voice alarm which informs the driver by voice that the tip of the fork is in danger of being caught on uneven road surfaces.
Clift safety device. 4. An indicator according to claim 1 or 2, wherein the indicator is a display indicator which informs the driver of the danger of the danger of the tip of the fork being caught on unevenness of the road surface by text or graphics. Clift safety device.