JPH0431329Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a type of shovel loader in which cargo handling work is performed by pedal operation, and more specifically, to prevent careless depression of the cargo handling pedal when getting on or off the vehicle. This invention relates to a locking device.

(Prior Art) Fig. 2 shows a skid steer type in which the lifting action of the lift arm 1 by the lift cylinder 1a and the dumping action of the bucket cart 2 by the dump cylinder 2a are performed by the cargo handling pedal 3, and the traveling is performed by lever operation. The figure shows a shovel loader. In this type of shovel loader, for example, when a driver steps on the cargo handling pedal 3 carelessly or erroneously when getting on or off, there is a risk that the lift arm 1 or the bucket 2 will suddenly move.

Therefore, as a conventional cargo handling pedal lock device to solve this problem, a pedal lock is arranged on the floor so that it can be rotated about a horizontal axis, and is engaged with an engaging part formed on the back side of the cargo handling pedal. It is known that the cargo handling pedal is held in a neutral position by locking the cargo handling pedal, and the pedal lock is generally operated using an electromagnetic solenoid or manual operation (for example, (Refer to Japanese Utility Model Application Publication No. 61-97468). In either the electromagnetic type or the manual type mentioned above, the electromagnetic solenoid or operating lever (in the case of Japanese Utility Model Application Publication No. 61-97468, a foldable step for boarding and alighting) is a link mechanism. The pedal lock is rotated through the pedal lock.

(Problem that the invention aims to solve) By the way, in the case of skid steer type shovel loaders, the foot area of the driver's seat is formed in a box shape, and the front side in particular is designed to prevent dirt, chicken manure, etc. from getting in during cargo handling operations. Since it is surrounded by a full-face board, it is very easy for dust to accumulate once it gets inside. On the other hand, the above-mentioned front panel does not completely protect against the intrusion of dirt, sand, etc., and dirt adhering to shoes is brought in when getting on and off the vehicle, so dirt and chicken droppings actually accumulate under the feet of the driver's seat. There are many cases. As shown in Fig. 7, dust 31 such as earth and sand and chicken droppings tends to accumulate under the feet, especially in the corners, while the link 33 connected to the pedal lock 32 is moved to the corner side so as not to get in the way of the driver. For example, since the dust 31 is normally arranged near the front plate 34,
There is a problem in that the movement of the link 33 is obstructed by this, resulting in malfunction of the pedal lock 32.

Therefore, in view of the above problems, the object of the present invention is to provide a cargo handling pedal lock device that can reliably operate the pedal lock without being affected by the accumulation of dust, for example, under the feet of the driver's seat. do.

(Means for solving the problem) The technical means for solving the above problem is to attach the locking part of the pedal lock, which is arranged on the floor so that it can rotate about a horizontal axis, to the back side of the cargo handling pedal. In a cargo handling pedal lock device that holds the cargo handling pedal in a neutral position by engaging with a formed engagement portion, one end of the horizontal shaft portion of the pedal lock is rotatably supported by a bracket, while the other end of the horizontal shaft portion is rotatably supported by a bracket. The output shaft of the actuating means whose drive source is an electric motor is directly connected to the end.

(Function) In the cargo handling pedal lock device configured as described above, the pedal lock is directly rotated around the horizontal axis by the output shaft of the actuating means using an electric motor as the drive source, so that dust can easily cover the pedal lock. As long as it does not accumulate, it can perform its intended function without being affected by dust.

(Example) Hereinafter, an example of the present invention will be specifically described based on the drawings. As shown in FIG. 1, a cargo handling pedal 3 for lift or dumping is attached to a pedal bracket 4 on the floor so as to be rotatable around a horizontal axis, and is attached via a rod 5 to a pedal 3 for lifting or dumping. The control valve 6 is connected to the control valve 6, and is normally in the neutral position shown in the figure, but is operated to the drive position by stepping on the front or rear side.

A pedal lock 7 for holding the cargo handling pedal 3 in a neutral position is arranged below the front side of the cargo handling pedal 3 so as to be rotatable around a horizontal axis.
Specifically, as shown in FIGS. 3 and 4, the pedal lock 7 has a horizontal shaft portion 8 extending horizontally in the width direction of the vehicle.
and two lock bars 9 protruding radially from this horizontal shaft portion 8, and a locking portion 9a formed at the tip of each lock bar 9 is attached to the front back surface of each of the lift and dump cargo handling pedals 3. Engagement part 3 formed
By being locked to a, the cargo handling pedal 3 is held at a neutral position.

The horizontal shaft portion 8 of the pedal lock 7 is formed in a hollow shape, and one end thereof is connected to the bracket 10.
is rotatably supported via an oil-free bearing 12 on a support shaft 11 fixed to the
It is directly connected to the output shaft 16 at. That is, the actuating means 13 of the pedal lock 7 consists of an electric motor 14 capable of forward and reverse rotation, and a worm gear type reduction gear 15, and an output shaft 16 of the reduction gear 15 is connected to the other end of the horizontal shaft portion 8 and the key. They are connected via 17. Note that an electric motor 14 and a reduction gear 15 constituting the actuating means 13 are fixed to a motor bracket 18. In addition, the reducer 15
A cam 1 is attached to the output shaft 16 in the box.
9 is installed, and two limit switches LS1 and LS for left rotation and right rotation for motor control are installed.
2 is turned on and off. In FIG. 1, reference numeral 20 indicates a front plate for preventing dirt, chicken droppings, etc. from entering the driver's seat.

FIG. 6 shows a control circuit for the electric motor 14. As shown in the figure, the rotation of the electric motor 14 is controlled by switching contacts RU1 of relay RU and switching contacts RU1 of relay RD.
It is designed to be converted by switching RD1 and changing the current direction from battery B.
And relay RU is a limit switch for left rotation.
LS1 and control relay RL's opening/closing contact RLb are both
The relay RD is energized when it is in the ON state, and the relay RD is energized when the limit switch RS2 for clockwise rotation and the normally open contact RLa of the control relay RL are both in the ON state. Further, the control relay RL is energized when both the key switch 21 and the seat belt switch 22 are in the ON state.

This embodiment is configured as described above,
The effect will be explained below. As shown in Figure 4,
In the pedal lock state in which the locking portion 9a of the lock bar 9 is locked with the engaging portion 3a of the cargo handling pedal 3, the limit switch LS1 for clockwise rotation is turned on by the convex portion 9a of the cam 19, as shown in FIG. 5A. Further, the limit switch LS2 for left rotation is in an OFF state corresponding to the recess 9b of the cam 19.

In this state, when the key switch 21 and seat belt switch 22 are turned on, the control relay RL is energized, so its normally open contact RLa is turned on.
It turns ON, and the normally closed contact RLb turns OFF. Therefore, the switching contact RD1 of the switching relay RD is switched, and the current direction to the electric motor 14 is changed to the sixth direction.
In this case, the electric motor 1
4 is rotated to the right, the pedal lock 7 is rotated clockwise via the worm gear type reducer 15, and the locking portion 9a of the lock bar 9 is disengaged from the engaging portion 3a of the cargo handling pedal 3 to lock the pedal. Release. As shown in FIG. 5B, this rotation stops when the limit switch LS2 for right rotation is turned OFF in correspondence with the recess 19b of the cam 19, and at this time, the limit switch LS1 for left rotation is turned OFF by the cam 19. The ON state is maintained by the convex portion 19a of No. 19.

On the other hand, when the key switch 21 or the seat belt switch 22 is turned OFF, the power to the control relay RL is cut off, its normally open contact RLa is turned OFF, and its normally closed contact RLb is turned ON. At this time, as mentioned above, use the limit switch LS for left rotation.
1 is in the ON state, the switching relay RU is energized and its switching contact RU1 is switched, so the current direction to the electric motor 14 is opposite to that described above.
The electric motor 14 is rotated to the left. Therefore, the pedal lock 7 rotates to the left in the drawing, and the locking portion 9a of the lock bar 9 locks the engaging portion 3a of the cargo handling pedal 3, thereby locking the cargo handling pedal 3 in the neutral position. At this time of locking, the limit switch LS1 for left rotation corresponds to the recess 19b of the cam 19.
OFF, the electric motor 14 stops, and the limit switch LS2 for clockwise rotation is held in the ON state by the convex portion 19a of the cam 19.

Therefore, the cargo handling pedal locking device configured and operating as described above locks the output shaft 1 of the reduction gear 15.
Since the pedal lock 7 is directly rotated by the pedal lock 7, even if dirt, etc. gets under the feet of the driver's seat and accumulates near the pedal lock 7 during actual cargo handling work, the amount of accumulated dirt will be reduced by the pedal lock 7 itself. As long as it does not become so large that it covers the soil, it is possible to perform its function satisfactorily without being affected by the accumulated sediment.

In this embodiment, a cam 19 and a limit switch LS1,
We have explained the case where LS2 is installed, but this can be done on the outside of the box or on the horizontal shaft part 8 of the pedal lock 7.
It is also possible to have a structure in which it is attached to the holder and covered with a cover as appropriate. In that case, the actuation means 1
Since the motor with a speed reducer can be used as a general commercially available product, compared to the conventional link-type cargo handling pedal lock device using an electromagnetic solenoid as a drive source or a manually operated mechanical link-type cargo handling pedal lock device. Therefore, assembly and adjustment thereof can be facilitated. In addition, in this embodiment, the horizontal shaft portion 8 of the pedal lock 7 is controlled by the oil-free bearing 12.
Since the structure supports the structure, it is possible to effectively prevent dust from entering or getting caught.

(Effects of the invention) As detailed above, the present invention directly connects the output shaft of the actuating means using an electric motor as a drive source to the horizontal shaft of the pedal lock, so that dust such as earth and sand can accumulate to the extent that it covers the pedal lock. It can perform its intended function without being affected by dust unless it is exposed to dust, and solves the problem of malfunction seen with conventional link type pedal lock devices, making it possible to securely lock the pedal and improving safety. It is of great help.

[Brief explanation of drawings]

Fig. 1 is a side view of a pedal lock device showing an embodiment of the present invention, Fig. 2 is a schematic side view of a shovel loader to which the pedal lock device is applied, Fig. 3 is a front sectional view of the pedal lock device as seen from the driver's seat side, and Fig. 4 The figure is a side view showing the operation mode of the pedal lock device, Figure 5 is an explanatory diagram showing the operation mode of the cam and limit switch, Figure 6 is a control circuit diagram of the electric motor, and Figure 7 is a diagram showing the operation mode of the cam and limit switch.
The figure is an explanatory diagram illustrating a link type pedal lock device. 3... Cargo handling pedal, 3a... Engaging portion, 7... Pedal lock, 8... Horizontal shaft portion, 9... Lock bar, 9a... Locking portion, 11... Support shaft, 13... Operating means, 14 ...Electric motor, 15...Reducer,
16...Output shaft.

Claims (1)

[Scope of utility model registration request] The cargo handling pedal is held in a neutral position by locking the locking portion of the pedal lock, which is arranged on the floor surface so as to be rotatable around a horizontal axis, to the engaging portion formed on the back surface of the cargo handling pedal. In the cargo handling pedal lock device, one end of the horizontal shaft of the pedal lock is rotatably supported by a bracket, and the other end of the horizontal shaft is directly connected to the output shaft of an actuating means using an electric motor as a drive source. Device.