JPH0431328Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention locks the cargo handling pedal in a skid steer loader with a cabin when the door for getting on and off is open, thereby preventing accidents caused by malfunction of the cargo handling device. It relates to a safety device that prevents.

[Prior Art] As shown in FIG. 5, in a general skid steer loader with a cabin, the lift arm 1 passes through the side of the cabin 2. In skid steer loaders, which are designed to be opened and closed for boarding and alighting, running operations are performed using steering levers 4 provided on each side of the left and right sides of the cabin 2, and cargo handling operations are performed using pedals. It's getting old. Since this cargo handling pedal is installed near the steps at the entrance/exit, the driver may accidentally step on the cargo handling pedal when getting on or off the vehicle, causing the cargo handling device to start moving on its own and the driver getting caught in the cargo handling device. There was a risk of accidents such as

Therefore, in order to prevent such malfunctions of cargo handling equipment, a safety device as shown in FIG. 6 has been conventionally employed.

That is, in FIG. 6, a protrusion 8 is formed in the middle of a connecting rod 7 that connects the cargo handling pedal 5 and the control valve 6 of the cargo handling hydraulic circuit, and a groove 10 at the lower end of the lock rod 9, which is provided to be movable up and down, It is adapted to engage with this protrusion 8. Further, a presser bar 12 for holding the driver during driving is swingably attached to the front pillar 11 of the cabin 2.

When the driver sits on the driver seat 13 to operate the skid steer loader and lowers the presser bar 12, the bent side portion of the presser bar 12 contacts the upper end of the lock rod 9 and pushes it down, causing the groove 10 at the lower end of the lock rod to be pressed down. and the protrusion 8 of the connecting rod 7 are separated, so that the cargo handling pedal 5 can be operated freely.

Furthermore, when getting on and off, the presser bar 12 is raised. At this time, the lock rod 9 is pushed up by the compression spring 14, and the groove 10 and the protrusion 8 engage to restrain the movement of the connecting rod 7. Lock 5. Therefore, even if the cargo handling pedal 5 is stepped on when getting on or off the vehicle, there is no fear that the cargo handling device will start moving.

[Problems to be solved by the invention] With the conventional safety device described above, it is possible to prevent the malfunction of the cargo handling device when the driver gets on and off the vehicle, but it is difficult to raise and lower the relatively heavy presser bar. In addition, the operator had to wear a seatbelt, which was cumbersome to operate.
Additionally, if the door is left ajar, for example, there is a risk that the door may open unexpectedly during cargo handling operations. There was a risk that the door would be damaged by the cargo handling equipment.

The purpose of this invention is to provide a safety device that eliminates such problems.

[Means for solving the problem] The safety device of this invention is a skid steer loader with a cabin that includes a sensing device that detects whether the door for boarding and exiting is open, and a signal from this sensing device that detects the opening of the cargo handling pedal. and a pedal locking device configured to lock the pedal.

[Operation] In the safety device according to this invention as described above, the cargo handling pedal is automatically locked when the door is opened.

[Embodiment] Hereinafter, a preferred embodiment of the safety device for a skid steer loader with a cabin according to this invention will be described in detail with reference to the drawings.

FIG. 1 of the drawings shows a circuit diagram of a safety device according to this invention. In the figure, numeral 20 is a button switch. This button switch 20 is
As clearly shown in the figure, one front pillar 1
1 and pivoted to the other front pillar (not shown) is closed, the door 3
The switch button 21 is pressed by the free edge of the switch button 21 to open the circuit. Further, reference numeral 30 indicates an electric pedal lock device, and a solenoid 31 thereof is connected in series to the button switch 20.

As shown in FIGS. 3 and 4, the petal lock device 30 includes a shaft 3 located below the front of the cargo handling pedal in parallel with the swing shaft 32 of the cargo handling pedal 5.
3 is rotatably supported. This shaft 3
A lever 34 extending downward is integrally provided at one end of the lock lever 3, and a lock lever 35 extends upward from the center. A solenoid 31 is mounted on a frame 36 behind the lever 34, and a rod 37 of the solenoid 31 and the lever 34 are connected by a connecting rod 38. When the solenoid 31 is energized and energized, the rod 37 retracts and the lever 34 is drawn rearward via the connecting rod 38. As a result, the lock bar 35 rotates forward, the rod portion 41 of the lock bar 35 fits into the groove 40 of the lock guide 39 fixed to the lower surface of the cargo handling pedal 5, and the head 42 is attached to the upper surface of the lock guide 39. and the lower surface of the cargo handling pedal 5 to restrain movement of the cargo handling pedal 5. Also, lever 3
4 and the front frame 36 is a tension spring 4
3 is provided, and the lever 34 is always pulled forward. Therefore, when the solenoid 31 is not energized, the lock bar 35 closes the lever 3.
4, the cargo handling pedal 5 is rotated rearward, separated from the lock guide 39, and the cargo handling pedal 5 is unlocked.

In such a configuration, the operation of the safety device according to this invention will be explained next.

When the door 3 is installed when getting on or off the vehicle, the button switch 20 is closed and a signal current flows from the battery 50 (FIG. 1) to the solenoid 31. As a result, the solenoid 31 is energized and the rod 37 is retracted, and as described above, the lock bar 35 is rotated forward and the cargo handling pedal 5 is locked.

Conversely, when door 3 is closed, switch button 21
is pressed to open the switch 20, the rod 37 of the solenoid 31 loses its tension, and the tension spring 43 pulls the lever 34 forward. As a result, the lock bar 35 is separated from the lock guide 39 and the cargo handling pedal 5 can be operated freely.

In the above embodiment, a button switch 20 is used which opens when the door 3 is closed, and a pedal lock device 30 is adapted to the button switch 20 and releases the lock when the current is cut off.
However, the sensing device for sensing the opening and closing of the door is not limited to the button switch 20 described above, and the electric circuit and pedal lock device can easily be changed as appropriate depending on the type of sensing device employed. be understood.

[Effects of the invention] As described above, according to this invention, the cargo handling pedal is automatically locked when the door opens, which ensures the safety of the driver when getting on and off the vehicle, and prevents the door from opening unexpectedly. Also, the door will not be damaged by the cargo handling equipment. Further, there is no need to perform special operations for locking and releasing the cargo handling pedal as in the conventional case, and the burden on the driver is reduced.

[Brief explanation of the drawing]

A circuit diagram of a safety device according to this invention shown in FIG.
Figure 2 is a partial horizontal sectional view of the front of the cabin showing the button switch that detects the opening and closing of the door; Figure 3 is a side view of the pedal lock device applied to this invention;
4 is a partial perspective view of the pedal lock device shown in FIG. 3, FIG. 5 is a perspective view of a skid steer loader with a cabin, and FIG. 6 is a schematic explanatory diagram showing a conventional general safety device. In the diagram, 2...cabin, 3...door, 20...
Button switch, 30...Pedal lock device, 3
1... Solenoid, 35... Lock bar, 39...
...Lock guide, 50...Battery.

Claims (1)

[Scope of utility model registration request] A skid steer loader with a cabin that has a door for getting on and off at the front of the cabin includes a sensing device for sensing that the door is open, and a signal from the sensing device to lock the cargo handling pedal. A safety device for a skid steer loader with a cabin consisting of a pedal lock device and a pedal lock device.