JPS603603Y2 - Forward/forward switching accelerator mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a forward/reverse switching accelerator mechanism particularly suitable for battery forklift trucks.

Conventionally, switching between forward and backward movement in a battery forklift truck has been performed by switching a direction switch to a forward or reverse position.

That is, when the direction switch is switched to the forward (reverse) position, the traveling motor is set in the forward (reverse) direction, and when the accelerator pedal 17 shown in FIG. 3 is depressed in this state, the accelerator pedal rod 18 and the accelerator link The accelerator arm 21 is rotated via the accelerator arm 20, whereby the accelerator device 22 is actuated to move forward (reverse).

However, the above accelerator mechanism requires manual switching of the direction switch.
The drawback was that they could not concentrate their hands solely on cargo handling.

In addition, there was a conventional system in which a pair of accelerator pedals were connected to a pair of accelerator devices to perform forward/reverse switching operations, but this required two accelerator devices, making the entire mechanism complex and complicated. The drawback was that it was expensive.

The purpose of the present invention is to eliminate the above-mentioned conventional defects by using a single accelerator device with forward and reverse accelerator pedals that are operated independently of each other, and with a forward and reverse limit switch. To provide a forward/reverse switching accelerator mechanism for a battery forklift truck or the like, which can easily perform forward/reverse switching operation simply by stepping on an accelerator pedal by providing corresponding accelerator pedals.

Hereinafter, an embodiment in which the present invention is embodied in a battery forklift truck will be described with reference to FIGS. 1 and 2.

1 in the figure is an accelerator device disposed inside a front protector (not shown) of a battery forklift, and an L-shaped accelerator arm 3 is attached to the outer periphery of the accelerator device 1 by an actuating shaft 2 protruding from the inside. The middle part is fixed.

A tension spring 4 is stretched between one end of the accelerator arm 3 and a pin 5 fixed to the outer circumference of the accelerator device 1, and urges the accelerator arm 3 to rotate toward the non-operating side.

6 is a rod portion 6A, a U-shaped portion 6B, and an extension portion 6.
C and a connecting portion 6D that rotatably connects the lower end of the rod member 6A and one end of the U-shaped portion 6B. The rod member 6A is movably supported, and the upper end portion of the rod member 6A is connected to the other end of the accelerator arm 3.

Further, rollers 8 and 9 are rotatably attached to the extension portion 6C at positions where the back surfaces of the tip portions of a forward accelerator pedal 10 and a reverse accelerator pedal 11, which will be described later, come into contact.

Reference numeral 10.11 denotes a forward accelerator pedal and a reverse accelerator pedal, whose base end is rotatably supported on the vehicle body frame, and whose back end abuts the rollers 8 and 9, and between the front end and the vehicle body frame. Said rollers 8, 9 in the free state due to tensioned tension springs 12.13.
Movement to the side is restricted.

Furthermore, LSF and LSR are a forward limit switch and a reverse limit switch that are pressed by the back surfaces of the respective accelerator pedals when the accelerator pedals 10 and 11 are depressed.
It is fixed to the vehicle body frame on the back side.

Note that 14 is a tension spring stretched between a part of the U-shaped portion 6B and the vehicle body frame, and prevents the accelerator arm 3 from being operated due to the weight of the accelerator link 6, and also prevents the accelerator pedal 10.11 from being actuated. This is a tension spring that provides operational resistance when stepping on the pedal.

Next, the aforementioned reverse limit switch LSF.

The operation will be explained using a control circuit shown in FIG. 2 in which the LSR and the accelerator device 1 are used to perform forward or reverse movement.

Now, when you want to move the forklift truck forward, when you step on the forward accelerator pedal 10, the accelerator link 6 is rotated in the X direction, and the operating shaft 2 of the accelerator device 1 is rotated in the Y direction via the accelerator arm 3. Ru.

Further, at this time, the forward limit switch LSF is operated by the back surface of the forward accelerator pedal 10.

When the forward limit switch LSF is activated, the normally open contact LSF-a in FIG. The current from B is supplied to forward electromagnetic relay MF through fuse F1, key switch SW1, limit switch LSA l, and normally open contact LSF-a.
is activated and its contactor MFS is switched to the forward position.

When a pulse from the control device circle set by the variable resistor VRA of the accelerator device 1, which is activated according to the amount of depression of the pedal 10, is input to the chopper circuit CH, the traveling motor DM rotates in the forward direction. be done.

In addition, if the forward accelerator pedal 10 is depressed beyond a certain level,
The limit switch LSA 2 of the accelerator device 1 is closed, and the high-speed electromagnetic relay MS is activated to open its normally open contact M.
S-a is closed to stop the pulse to the chopper circuit CH, and the normally open contact MS-a' connected in parallel to the chopper circuit is closed, causing the travel motor DM to rotate at high speed.

On the other hand, when the reverse accelerator pedal 11 is depressed, the reverse limit switch LSR is activated in the same manner as in the forward operation described above.
is activated and its normally open contact LSR-a is closed, so the current from battery B is supplied to the reverse electromagnetic relay MR through the normally open contact LSR-a, which activates the relay MR and switches it. Contact MR3 is switched to the reverse position,
The traveling motor DM is rotated in the backward direction.

Note that when one of the accelerator pedals is depressed, the other accelerator pedal is activated by the tension spring 12 or 13.
As a result, the corresponding limit switches LSF, I, and SR are not activated.

In addition, the limit switch must be activated immediately when the accelerator pedal is depressed, and must remain activated until the maximum depression is reached, so it is placed near the base end of the accelerator pedal, where the amount of rotation is small. is desirable.

As described above, in the device of the present invention, the forward and reverse accelerator pedals 10.11 are connected to the extension part 6 of the accelerator link 6.
C, and each accelerator pedal 1
0.11 Spring 12.13 that restrains movement in the depression direction in the free state is attached to the vehicle body frame and each pedal 1.
0.11, and each accelerator pedal 10.1.
By disposing a forward limit switch LSF and a reverse limit switch LSR, which are activated by each pedal 10, 11 when step 1 is depressed, in the vehicle body frame, 11 accelerator devices and accelerator pedals 10, 11 are installed.
It is possible to have an extremely simple structure with only two limit switches LSF and LSR for forward and reverse travel, and it is possible to easily switch between forward and reverse travel simply by pressing the accelerator pedal 10 and 11. As a result, the child can be used exclusively for cargo handling work, thereby improving work efficiency and safety.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the accelerator mechanism for forward and backward movement of the present invention, FIG. 2 is an electric circuit diagram of the accelerator device, and FIG. 3 is a perspective view showing a conventional accelerator mechanism. 1...Accelerator device, 3...Accelerator arm, 6...Accelerator link, 6C...
... Extension part, 10 ... Accelerator pedal for forward movement, 11 ... Accelerator pedal for reverse movement, 12, 13
...Tension spring, LSF...Forward limit switch, LSR...Reverse limit switch.

Claims (1)

[Scope of utility model registration request] One end is connected to the accelerator arm of the accelerator device, the middle part is rotatably supported, and the other end includes an accelerator link that abuts the accelerator pedal, and when the accelerator pedal is depressed, the accelerator is In the accelerator mechanism whose operation is controlled by the device,
The part of the accelerator link that contacts the accelerator pedal is extended to form an extended part, and a forward accelerator pedal and a reverse accelerator pedal are disposed in the extended part, and each accelerator pedal can be depressed in a free state. A spring that restricts movement in this direction is placed between the body frame and each pedal, and a forward limit switch and a reverse limit switch that are activated by each pedal when each accelerator pedal is depressed are placed on the body frame. This is an accelerator mechanism that switches forward and backward.