JPH0137006Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to an operating lever device for construction machinery, etc., which is equipped with a lever lock safety device that locks the operating lever of construction machinery such as a hydraulic excavator, which has an upper revolving body. It is.

[Prior art]

For example, as shown in Figure 1, the operating lever of a construction machine with an upper revolving body such as a hydraulic excavator is located at the driver's seat a.
From the entrance side, there are operating lever b for controlling the left and right rotation of the upper revolving structure and vertical movement of the arm, operating lever c for moving the left crawler forward and backward, operating lever d for moving the right crawler forward and backward, operating lever e for operating the bucket and boom, etc. has been done.

When ending or interrupting the operation of the construction machine, the driver operates the engine control lever f to stop the engine, and then locks the control levers b and e,
We had to take precautions to prevent accidents caused by malfunctions.

However, since the driver can relatively freely enter and exit the cab of conventional construction machinery, after the driver stops the engine using the engine control lever f, the driver can turn each control lever b, c, d, and e. I often forget to lock the car and immediately leave the driver's seat a. Or, when operation is stopped without the upper revolving structure, boom, arm, shovel, etc. of the construction machine being returned to the basic position at the time of operation stoppage, and the operator leaves the driver's seat a immediately after the engine stops. There is also.

In such a case, if the driver accidentally operates the control levers b, c, d, or e, or if the driver's clothes get caught on the control levers b, c, d, or e, the upper revolving structure, etc. It is dangerous because the machine may rotate or move due to its own weight. This is especially dangerous on a slope, and the operating lever b near the entrance is likely to be operated incorrectly, which may cause the upper revolving body to swing and the driver to be thrown out of the driver's cab.

[Purpose of invention]

The purpose of the present invention is to ensure that the control lever is locked when the operation of construction machinery, etc. is stopped, and to eliminate accidents caused by erroneous operation of the control lever when the operation is stopped.

[Structure of the idea]

In this invention, a safety lock lever is installed between the driver's seat and the driver's cabin entrance side so that the operator cannot exit the driver's cabin without operating the safety lock lever, and a reach rod that operates a control valve is fixed to the safety lock lever. This device is applied to a driving control lever device for construction machinery, etc., in which the driver is required to operate the safety lock lever every time he leaves the operator's cab by interlocking the mechanism to lock each control lever.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

2 to 5 show an embodiment of the present invention, and are an example of a construction machine in which operating levers 1 and 1' are arranged so as to be located on both sides of a driver.

A safety lock lever 4 is rotatably mounted on the floor of the doorway 3 of the operator's cab 2 with a bracket and a pin, and one end of a push-pull cable 5 is connected to the lower end of the safety lock lever 4, and the push-pull cable 5 is connected to the lower end of the safety lock lever 4. The outer cylinder 6 of the pull cable 5 is fixed to the underfloor surface with a bracket 7.

Reach rods 10, 1 of control valves 8, 9 operated by respective operating levers 1, 1'
1, 12, 13, 14, 15, each piece 16 has a circular piece 16 attached to each of the reach rods 10, 11, 1.
2, 13, 14, and 15 with screws 17 so that they are located on a straight line orthogonal to each other.
As shown in the figure, a recess 18 that can fit with the piece 16
A lever 19 having one end thereof is pivoted to the frame 21 of the construction machine by a pin 20 so as to be rotatable and fit with each of the pieces 16, respectively, and the other end of each lever 19 is attached to one end. They are connected at required intervals by rods 22, and by pushing and pulling the rods 22, each lever 19 can be rotated.

The push-pull cable 5 is connected to one end of the rod 22, and the outer cylinder 6 of the push-pull cable 5 is fixed to the frame 21 with the bracket 23. When the safety lock lever 4 is rotated, the push-pull cable 5 is connected to one end of the rod 22. The rod 22 is pushed and pulled by the pull cable 5, and each lever 19 is rotated so that the recess 18 of the lever 19 is fitted into and separated from the piece 16 fixed to each reach rod 10.

Here, the relationship between the rotational position of the safety lock lever 4 and the position of each lever 19 is as follows.
When the levers are rotated backwards to the lock position L to facilitate the driver's entry and exit into the driver's cab 2, each lever 1
When the recess 18 of each lever 19 and each piece 16 are fitted into each other, and when the safety lock lever 4 is rotated forward to the unlocked position F to make it difficult to come out from inside the driver's cab 2, the recess 18 of each lever 19 is fitted. is set so that each piece 16 leaves the husband.

With the construction as described above, the driver who has stopped the operation of the construction machine is prevented from exiting the operator's cab 2 because the safety lock lever 4 is in the unlocked position F. Therefore, when leaving the driver's cab 2, the driver must always move the safety lock lever 4 to the lock position L.
must be rotated until.

When the safety lock lever 4 is rotated to the lock position L, the push-pull cable 5 connected to the lower end of the safety lock lever 4 is pulled, and the rod 22 connected to the other end of the push-pull cable 5 is pulled out. The levers 19 connected to the rods 22 rotate about the pins 20, and the recesses 18 at the tips of the levers 19 move toward the reach rods 10, 11, 12, 13, 14, 15. Each reach rod is fitted with a piece 16 fixed thereto, and movement of each reach rod in the axial direction is restrained, and the operating lever is placed in a locked state.

Next, when the driver takes the driver's seat and starts driving, the safety lock lever 4 is moved to the lock release position F.
When the push-pull cable 5 is rotated until it is rotated, the push-pull cable 5 is pushed out, and the rod 22
Move to the side and touch the recess 18 of each lever 19 and each piece 16.
Since the fitting with the construction machine is released and the locking state of the operating lever is released, the construction machine can be operated. In this unlocked state, the safety lock lever 4 is located on the side of the entrance/exit 3 of the operating lever 1, so even if it becomes a hindrance to entering/exiting, it does not impede driving operation at all.

In addition, if you do not want to lock some of the operating levers 1 or do not need to lock them, use the pieces 16 attached to the reach rods 10 to 15 connected to the operating levers 1 that are not locked. After loosening the screw 17 and moving the piece 16 to a position unrelated to the operation of the lever 19,
By tightening the lever 7 and fixing the piece 16, it is extremely easy to keep only the target operating lever 1 in the unlocked state at all times.

Furthermore, in the driving operation lever device of the present invention, only the safety lock lever 4 is added inside the driver's cab 2, and the safety lock lever 4 is located near the entrance/exit of the driver's cab 2 and rotates along the entrance/exit surface. Therefore, even if there are a large number of other operating levers 1, there will be no unnecessary items in the driver's cab 2, and the driving work will not be hindered.

The operation control lever device for construction machinery, etc. of the present invention is not limited to the above-mentioned embodiment, and the safety lock lever can be installed at any position as long as it does not obstruct the entrance or exit and does not interfere with operation. Of course, various modifications may be made without departing from the spirit of the present invention, such as being able to attach it to a location in any direction, or using links instead of push-pull cables.

[Effect of idea]

As described above, according to the operation control lever device for construction machinery, etc. of the present invention, a safety lock lever is disposed near the entrance/exit of the operator's cab so that the operator cannot exit the operator's cab unless the safety lock lever is operated. Since the safety lock lever is linked with a mechanism that fixes the reach rod for operating the control valve, the safety lock lever will prevent the driver from leaving the cab, so the safety lock lever is rotated to the locked position and fixed at the same time. The mechanism ensures that the control lever is locked, so it is impossible to forget to lock the control lever as in the past, and it is possible to prevent accidents caused by erroneous operation of the control lever when the machine is stopped. By moving the lever to a position unrelated to its operation, the corresponding control lever can be unlocked, and since the only thing inside the operator's cab is the safety lock lever that rotates along the entrance/exit surface, there is no need to worry about interfering with the operation. Various excellent effects can be achieved, such as being able to prevent

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of a conventional driving operation lever device.
Fig. 2 is an explanatory diagram of the operation control lever device for construction machinery, etc. of the present invention, Fig. 3 is a view taken in the - direction arrow of Fig. 2, Fig. 4 is a view taken in the - direction arrow of Fig. 3, and Fig. 5 is a view taken along the - direction arrow in FIG. 4; 1 and 1' are operating levers, 2 is a driver's cab, 3 is an entrance/exit, 4 is a safety lock lever, 5 is a push-pull cable, 8 and 9 are control valves, 10-1
5 is a reach rod, 16 is a piece, 18 is a recess, 19
indicates a lever, and 22 indicates a rod.

Claims (1)

[Scope of utility model registration request] A safety lock lever is pivotally installed near the driver's cabin entrance so that it can rotate along the entrance/exit surface, and a piece is attached with a screw to a reach rod for controlling the control valve switching operated by the operating lever, and the piece is fitted into the safety lock lever. The safety lock lever includes a fixing mechanism in which a lever having a concave portion at one end is rotatably attached to a frame of a construction machine or the like, and is capable of restraining movement of the reach rod in the axial direction by engagement of the piece with the lever concave portion. When the safety lock lever is in a position that prevents the driver from getting on and off the vehicle, the locking mechanism is released, and when the safety lock lever is in a position that does not prevent the driver from getting on and off the vehicle, the locking mechanism is activated to lock the operating lever. An operating lever device for construction machinery, etc., characterized by: