JP2603000B2 - Safety devices for vehicle construction machinery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for a vehicle-type construction machine when getting on and off and running.

[0002]

2. Description of the Related Art Recently, a vehicle-type construction machine such as a wheel-type hydraulic excavator has been developed in which a console is arranged beside a driver's seat and an operation lever is provided on the upper surface thereof. In this type of construction machine, the console is often in the way when getting on and off, so that the console can be flipped up or slid backward to improve the getting on and off. And in the vehicle construction machine configured in this way,
A safety device is provided so that the front attachments such as the boom and the arm do not operate even if the operation lever on the console is inadvertently operated when getting on and off.

Conventionally, a safety device of this kind for a vehicle-based construction machine disclosed in Japanese Patent Application Laid-Open No. 63-11727 is known. The construction machine shown in this publication is
It has a console that can slide back and forth beside the driver's seat, and pilot valves for various actuators are operated by operating an operation lever on the console. A lock valve is provided between the pilot valve and the pilot control valve to connect and disconnect the pilot valve and the pilot control valve. The lock valve is connected to the console slide lever via a link or the like, and the console slide lever is turned. When the console is slid forward by a dynamic operation, the lock valve is switched to the communicating position, and when the console is slid backward, the lock valve is switched to the shut-off position. When the lock valve is in the communication position, various actuators can be operated by operating the operation lever on the console, and when the lock valve is in the shut-off position, various actuators do not operate even if the operation lever is operated. Is secured.

[0004]

However, in such a conventional safety device for a vehicle-based construction machine, while the console is slid backward from the front, the lock valve is in the communicating position, and the console is not connected. When it reaches the rear, it switches to the blocking position. Therefore, if the console gets on and off the front and rear halfway and touches the operation lever, various actuators may malfunction.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a safety device for a vehicle construction machine in which the console is retracted from a driver's doorway after the operation of various actuators is locked.

[0006]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described with reference to FIG. 1 which is an embodiment of the present invention. The present invention is directed to a lock means 10 for locking the operation of various actuators when operated to a lock position. A gate lock lever that is operated at least between a first position at which the vehicle enters the driver's doorway and a second position at which the driver retracts from the doorway, and switches the lock means 10 to the lock position in conjunction with the operation. 8 and
A vehicle equipped with a console 2 which moves between a first position at the side of the driver's seat to enter the entrance and a second position retracted from the entrance, and on which operation levers of various actuators are arranged. Applied to safety devices for construction machinery. According to the first aspect of the present invention, there is provided the permitting means 21 for permitting the movement of the console 2 from the first position to the second position only when the lock means 10 is locked. Achieve the goal. The gate lock lever 8 according to the second aspect of the present invention has a third position for operating the permitting means 21 by being further operated from the second position.
Is configured to move from the first position to the second position when the gate lock lever 8 is operated from the second position to the third position. The invention according to claim 3 is the console 2
Has a prohibiting means 20 for prohibiting the operation of the gate lock lever 8 to the first position when is moved to the second position.

[0007]

When the gate lock lever is operated from the first position to the second position, the locking means is switched to the locked position in conjunction with this operation. Only in this locked position, the console 2 is allowed to move from the first position to the second position. When the gate lock lever 8 is operated to the third position after the gate lock lever 8 is operated to the second position and the lock means 10 is switched to the lock position, the console 2 is moved to the third position. Move from the first position to the second position. Claim 3: When the console 2 moves to the second position, the inhibiting means 20
Prohibits the operation of the gate lock lever 8 to the first position.

[0008] In the means and means for solving the above-mentioned problems which explain the constitution of the present invention, the drawings of the embodiments are used to make the present invention easy to understand. It is not limited to.

[0009]

An embodiment will be described below with reference to FIGS. In FIG. 1, reference numeral 1 denotes a driver's seat provided on a vehicle body. A console 2 is disposed on each of the left and right sides of the driver's seat 1, and an operation lever 2b projects from a front portion 2a of the console 2. ing. The rear end of the console 2 is rotatably supported via a hinge pin 4, and a gas spring 5 provided between the console 2 and the vehicle body uses the hinge pin 4 as a fulcrum to move the console 2 to a clock. It is biased in the rotation direction. A pawl 6 is rotatably mounted on the front side of the console 2.
Is engaged with a hook 7 fixed to the vehicle body.

A base 8a of the gate lock lever 8 is rotatably supported by a vehicle body via a hinge pin 9, and a lower end of the base 8a is connected to a rod 11 by an arm 10a of a lock valve 10 fixed to the lower surface of the vehicle body floor. It is connected by. The lock valve 10 is provided, for example, in a pilot line of a pilot valve operated by the operation lever 2b.
Is activated, shuts off the pilot line, and operates the operation lever 2b.
Even if is operated, various actuators for driving the boom, the arm and the like are not operated. When the gate lock lever 8 is rotated clockwise, as shown in FIG. 2, the operating portion 8b opens the doorway of the driver's seat 1, and the arm 10a of the lock valve 10 rotates clockwise. To lock the operation of various actuators. When the gate lock lever 8 is rotated counterclockwise from this state, the operating portion 8b shuts off the entrance of the driver's seat 1 and the arm 10a of the lock valve 10 rotates counterclockwise to lock. Cancel.

[0011] As shown in FIG.
A toggle link 12 projecting in a direction substantially perpendicular to the base portion 8a of the toggle lock 8 is fixedly secured. A tip 13 of the toggle link 12 and a pin 13 fixed to the vehicle body are hooked at both ends of a tension spring 14, and are shown by solid lines in FIG. In this state, the arm 12 is urged in the counterclockwise direction, and in this state, the gate lock lever 8 is held at a position for blocking the doorway of the driver's seat. When the gate lock lever 8 is rotated clockwise, the toggle link 12 is rotated integrally with the gate lock lever 8, and when the gate link lever 8 is operated by a certain amount, as shown by a broken line, the tension spring 14 is turned on.
Holds the gate lock lever 8 through the toggle link 12 at a position where the doorway of the driver's seat 1 is opened.

Referring again to FIG. 1, one ends of the first and second outer tubes 15 and 16 are both locked by a plate 17 fixed to the vehicle body, and the other end of the first outer tube 15 is fixed to the vehicle body. The second outer tube 16
The other ends are locked by plates 19 fixed to the console 2, respectively. First and second outer tubes 15,
The first and second inner wires 20 and 21 are slidably inserted into 16 respectively. First and second inner wires 2
One end of each of 0 and 21 is screwed into the first and second fork levers 22 and 23 as shown in detail in FIG. 4, and the other end is fixed to the console 2 and the pawl 6, respectively.

Slots 22a and 23a are formed in the first and second fork levers 22 and 23, respectively.
Pins 24 and 25 fixedly mounted on the base 8a above and below the hinge pin 9 are slidably fitted to 2a and 23a, respectively. On the front side of the second fork lever 23, a hexagonal bolt 26 is disposed via a compression spring 27 so as to be slidable back and forth. When the gate lock lever 8 blocks the doorway of the driver's seat 1, the pin 24 is
, And the pin 25 is engaged with the rear end of the elongated hole 23a.

Next, the operation will be described. In FIG. 1, when the gate lock lever 8 is rotated clockwise, the pins 25 and 24 slide forward and backward through the long holes 23a and 22a, respectively. As shown in FIG.
When the gate lock lever 8 is operated to a position where the lock levers 5 and 24 are engaged with the front ends and the rear ends of the long holes 23a and 22a, the arm 10a of the lock valve 10 rotates clockwise, and the lock valve 10 is turned. When activated, the operation of various actuators is prohibited. Further, as shown in FIG. 5, the arm 12 switches to the position shown by the broken line, and the tension spring 14
The lock lever 8 is biased clockwise.

When the gate lock lever 8 is further rotated from the position shown in FIG. 2, the spring 27 is compressed and the pawl 6
Is pulled backward via the second inner wire 21 and comes off the hook fitting 7. Accordingly, the console 2 is urged by the gas spring 5 to rotate clockwise, as shown in FIG.
As shown in FIG. At this time, the first form
The cleaver 22 is connected to the console via the first inner wire 20.
The front end of the elongated hole 22 a engages with the pin 24. Here, when the power of the hand of the gate lock lever 8 is loosened, the claw 6 is pushed back by the spring 27 via the second inner wire 21 and the second fork lever 23, and
It returns to a position where it can be engaged with the hook fitting 7.

When the console 2 is in the flip-up state as shown in FIG. 3, the operating lever 2b is retracted rearward from the doorway of the cab, so that getting on and off is easy. Further, at this time, the lock valve 10 is operating, and there is no possibility that various actuators will malfunction even if the operation lever 2b is touched by mistake. Further, at this time, the toggle link 12 is urged clockwise by a spring 14 as shown in FIG. 5, the urging force is acting on the gate lock lever 8 and the first inner wire 20 -The lock 8 is pulled clockwise. Therefore, in order to rotate the gate lock lever 8 in the counterclockwise rotation direction when the console is flipped up, a considerably large operation force must be applied against the spring force of the spring 14 and the spring force of the gas spring 5. Not
It is practically impossible to unlock the lock valve 10 by operating the gate lock lever 8 counterclockwise while the console 2 is flipped up. For this reason,
Safety is improved.

Here, as shown in FIG. 3, when the driver jumps into the driver's seat 1 by flipping up the console 2 and operates the driver, the console 2 is pushed down and the claws 6 are engaged with the hook fittings 7. As shown in FIG. Lock valve 1
0 holds the operating state, and there is no possibility of erroneous operation.
When the driving operation is performed in the state of FIG. 2, the lock valve 10 is in the locked state even if the driver does not particularly perform the operation, and the erroneous operation during the driving operation can be reliably prevented. Not only that,
The operation lever 2b is located at the front left of the driver's seat and does not hinder the traveling operation.

If the work is to be continued after traveling, the operation is performed as shown in FIG.
In this state, the gate lock lever 8 is rotated counterclockwise to the position shown in FIG. 1 to bring the lock valve 10 into the unlocked state.

Next, a modification of the above embodiment will be described with reference to FIG. In this modification, the control of the lock valve is performed electrically. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. The power supply 31 is connected to a solenoid 34a of an electromagnetic switching lock valve 34 via limit switches 32 and 33 connected in series to each other.
The state shown is the state at the time of work, and the limit switch 3
2 and 33 are closed, and the electromagnetic switching type lock valve 34 is switched to the low position. When the lock valve 34 is in the position B,
The pilot pipeline of the pilot valve operated by the operation lever 2b is in communication, and various actuators can be operated by operating the operation lever 2b. When the gate lock lever 8 is rotated clockwise from this state, the limit switch 33 is turned off, the solenoid portion 34a of the lock valve 34 is demagnetized, the lock valve 34 is switched to the a position, and the various actuators operate. Locked. When the gate lock lever 8 is further rotated, the console 2
The limit switch 32 is turned off. The console 2 is returned to the original state, and the limit switch 3
Even if the switch 2 is turned on, the limit switch 33 remains off, the lock valve 34 keeps the a position, and the operation of various actuators is prohibited. When the gate lock lever 8 is rotated to the position shown in FIG.
Is turned on, the solenoid 34a of the lock valve 34 is excited again, the lock valve 34 is switched to the low position, the lock is released, and the work operation becomes possible.

In the configuration of the above embodiment, the lock valve 1
0 constitutes a locking means, the first inner wire 20 constitutes a prohibiting means, and the second inner wire 21 constitutes a permitting means.

[0021]

According to the present invention, since the console is moved from the first position to the second position only when the locking means is locked, there is a possibility that the console may malfunction during the console moving operation. Disappears. According to the third aspect, when the console is moved to the second position, the operation of the gate lock lever to the first position is prohibited. The lock is never released.

[Brief description of the drawings]

FIG. 1 is a view showing one embodiment of a safety device for a construction machine according to the present invention.

FIG. 2 is a view for explaining the operation of the embodiment of FIG. 1;

FIG. 3 is a diagram illustrating the operation of the embodiment of FIG. 1;

FIG. 4 is an enlarged view of a main part of FIG. 1;

FIG. 5 is a diagram showing details of one embodiment of FIG. 1;

FIG. 6 is a diagram showing a modification of the embodiment of FIG. 1;

[Explanation of symbols]

 2 Console 8 Gate lock lever 10 Lock valve 20 First inner wire 21 Second inner wire

Continuing from the front page (72) Inventor Kazuo Asano 650, Kandamachi, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Inside the Tsuchiura Plant (72) Inventor Junichi Hosono 2-6-1 Otemachi, Chiyoda-ku, Tokyo Hitachi Construction Machinery Stock In-house (72) Inventor Akira Tatsumi 650 Kandamachi, Tsuchiura-shi, Ibaraki Pref.

Claims (3)

(57) [Claims] At least a lock means for locking the operation of various actuators when operated to a lock position, a first position for entering an entrance of a driver's seat, and a second position retracting from the entrance. A gate lock lever which is operated and switches the lock means to a lock position in conjunction with the operation, and a first which enters the entrance at a side of a driver's seat.
And a second position retreating from the entrance and exit and a console provided with operation levers for the various actuators. A safety device for a vehicle-based construction machine, comprising: a permitting means for permitting the console to move from a first position to a second position only in a locked state. 2. The safety device according to claim 1, wherein the gate lock lever has a third position to be further operated from the second position to drive the permitting means, and the console is , Wherein the gate lock lever is configured to move from the first position to the second position when the gate lock lever is operated from the second position to the third position. Safety device. 3. The safety device according to claim 2, further comprising prohibition means for prohibiting operation of the gate lock lever to the first position when the console is moved to the second position. A safety device for a vehicle construction machine characterized by the above-mentioned.