JPS6343849A - Pedal locking device circuit - Google Patents

Abstract

PURPOSE:To aim at prevention of an accident attributable to such a case of driving a car without attaching a seat belt, by constituting a locking device of a handling pedal so as to be released only when a seat belt switch has operated after operation of a seat switch. CONSTITUTION:When a driver takes his seat 8, a seat switch 1 is turned on, whereby a solenoid relay R1 is energized with current through a B terminal R2d of a solenoid relay R2, and this solenoid relay R1 is excited. With this excitation, an A terminal R1a of this solenoid relay R1 comes on and the B terminal R1b comes off instead. Next, when the driver wears the seat belt, a seat belt switch 2 is turned on, and afterward, if a key switch 3 is turned on, a solenoid is energized with current whereby a lock of a handling pedal 7 by a stopper 5 is released, coming into a drivable state. Therefore, a after the driver takes his seat 8, the lock of the handling pedal 7 is not released unless he wears the seat belt, thus safety driving is securable.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to improvements in pedal lock devices for industrial vehicles.

More specifically, the present invention relates to an electrical circuit configuration of an electromagnetic cargo handling pedal locking device of a so-called skid steer loader or the like, which drives left and right wheels independently for running and steering.

[Conventional technology]

In a skid steer loader, if the driver does not sit properly in the driver's seat or operates the cargo handling device in an abnormal posture, it is very dangerous and can easily cause a serious accident.

For this reason, on skid steer loaders, the cargo handling pedals are automatically locked when operation is stopped.
The driver will be seated in the seat the next time driving resumes, and
The electromagnetic pedal lock device is released when the seat belt is fastened and the key switch is turned on.

The current electromagnetic cargo handling pedal lock device has a circuit configuration as shown in FIGS. 2 and 3.

That is, the key switch 3 of the skid steer loader,
Seat switch 1 activated by the load when the driver is seated
A seatbelt switch 2, which is activated when the driver fastens (connects) the seatbelt, and a solenoid 4 for unlocking the cargo handling pedal 7 are connected in series. Therefore,
When the seat switch 1, seat belt switch 2, and key switch 3 are all turned on, the unlocking solenoid 4 of the cargo handling pedal 7 is energized, and the stopper 5 of the cargo handling pedal 7 swings around the pin 6. Then, the stopper 5 is removed from the cargo handling pedal 7, and the cargo handling pedal 7 becomes operable.

[Problem that the invention seeks to solve]

With the conventional load handling pedal lock release device circuit, as long as the seat belt is tied, even if it is not attached to the driver's body.
There is a problem with the locking device being released.

In other words, if the seatbelt is tied at its end while it is long, the locking device may come off even if it is placed on the top of the seat, behind the seat, or under the driver's buttocks. , there is a problem that cargo handling operations become possible.

It is extremely dangerous to operate a skid steer loader in such a state, and the inventors of the present invention have conducted extensive studies to solve the above-mentioned problems.

As a result, in the conventional cargo pedal lock release device circuit,
The problem is that if the conditions of the driver being seated in the seat, fastening the seat belt, and turning on the key switch are satisfied, the cargo handling pedal will be released regardless of the order in which the switches are activated. I found out that there is.

[Means for solving problems]

The present invention has been made based on the above-mentioned findings, and includes a seat switch that is activated when a load is applied to the seat, and a seatbelt switch that is activated when the seatbelt is connected, which are arranged in parallel, and which are energized and excited by each switch. The above-mentioned problem is solved by a pedal locking device circuit that includes a relay so that the cargo pedal locking device is released only when the seat belt switch is activated after the seat switch is activated.

(Function) In the present invention, the cargo handling pedal lock device is released only when the seat belt switch is activated after the seat switch is activated, so that the driver can fasten the seat belt around his body after sitting in the seat. If the seat belt is attached to the vehicle, the cargo handling pedal lock device will be released, but if the seat belt is tied while sitting in the seat, the cargo handling pedal lock device will not be released and cargo handling operations cannot be performed. Accidents caused by driving without one can be prevented.

〔Example〕

FIG. 1 shows a circuit diagram of a pedal locking device circuit according to the present invention. An electromagnetic relay R1 is connected in series to a seat switch 1 that is activated when a driver sits on a seat 8.

Further, an electromagnetic relay R2 is connected in series to the seat belt switch 2, which is activated by tying the seat belt.

Further, a key switch 3 for operating the skid steer loader and a solenoid 4 for releasing the cargo handling lock device are provided in series with the seat belt switch 2 and in parallel with the electromagnetic relay R2.

The armature of the solenoid 4 is connected to a stopper 5 that can swing around the bin 6, as shown in FIG. 2, and the stopper 5 swings to engage the cargo handling pedal 7 (to lock the cargo handling pedal). , or detach from the cargo handling pedal 7 (unlocking the cargo handling pedal).

A normally closed contact (B terminal) Rlb of the electromagnetic relay R1 is provided in series with the relay R2, and a normally closed contact (A terminal) Rla is provided in series with the key switch 3 and the solenoid 4. Furthermore, the normally closed contact (B terminal) R2b of electromagnetic relay R2
is provided in series with relay R1.

With the above configuration, under normal conditions it operates as follows.

Initially, seat switch 1, seat belt switch 2, and key switch 3 are all off, and electromagnetic relay R1,
R2 is in a de-energized state.

When the driver sits on the seat 8, the seat switch 1 is turned on, and the 8 terminal R2b of the electromagnetic relay R2 is turned on.

The electromagnetic relay R1 is energized through the seat switch 1 and excited. As a result, the A terminal R1a of the electromagnetic relay R1 is turned on, and the B terminal R1b is turned off.

Next, when the driver seated in the seat 8 puts on a seat belt, the seat belt switch 2 is turned on. However, the electromagnetic relay R2 is not energized because the B terminal R1b of the electromagnetic relay R1 is off.

Furthermore, when the driver turns on the key switch 3, the solenoid 4 is energized through the seat belt switch 2, the A terminal R1a of the electromagnetic relay R1, and the key switch 3, and the cargo handling pedal is unlocked.

When the driver ties the seat belt before sitting in the seat 8 and sets it on the seat 8 or behind the seat 8, the seat switch 1 and the key switch 3 are turned off and the seat belt 2 is turned on. .

In this state, the seat switch 1 is off, and the electromagnetic relay R1 is off. Therefore, the B terminal R1b of the electromagnetic relay R1 is turned on, and the seat belt switch 2 is turned on.
is on, electromagnetic relay R2 is energized and excited, and eight terminals R2b of electromagnetic relay R2 are off.

Even if the driver sits on the seat to operate the cargo handling system in this state, the B terminal R2b of the electromagnetic relay R2 is off, so even if the seat switch 1 is turned on, the electromagnetic relay 1 will not be energized. . Therefore, Am of electromagnetic relay R1
The terminal R1a remains off, the B terminal R1b remains on, and the electromagnetic relay 2 continues to be energized.

Even if the driver turns on key switch 3, electromagnetic relay R1
Since the A terminal R1a is off, the solenoid 4 is not energized and the cargo handling pedal 7 is not unlocked.

As described above, with this circuit configuration, the cargo handling pedal 7 will not be unlocked unless the driver attaches the seat belt to his or her waist or shoulder (in the case of a three-point seat belt) after sitting in the seat 8. .

When the driver gets off the vehicle, turn off either seat switch 1, seat belt switch 2, or key switch 3.
The power to the solenoid 4 is cut off, and the cargo handling pedal 7 is locked.

〔Effect of the invention〕

According to the present invention, the lower pedal pedal cannot be released unless the driver fastens the seat belt after sitting in the seat, so the driver can be assured of fastening the seat belt, and cargo handling work can be carried out safely. can be done.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention, and FIGS. 2 and 3 are conventional circuit diagrams. 1...Seat switch, 2...Seat belt switch, 3...Key switch, 4...Solenoid.

Claims (1)

[Claims] 1. A seat switch that activates when a load is applied to the seat,
A seat belt switch that is activated when the seat belt is connected is placed in parallel, and a relay is provided that is energized and energized by each switch, so that the pedal lock device is released only when the seat belt switch is activated after the seat switch is activated. A pedal lock device circuit characterized in that: