JPH0137007Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is equipped with a lever lock safety mechanism and an operation lever bending mechanism that lock the operation lever of a construction machine having an upper rotating body such as a hydraulic excavator, and the two mechanisms are linked. The present invention relates to a driving control lever device for construction machinery, etc., which is designed to force the driver to move the vehicle.

[Prior art]

For example, as shown in Fig. 1, the operating levers of a construction machine such as a hydraulic excavator having a rotating upper body include an operating lever b that operates the left and right rotation of the upper rotating body and the vertical movement of the arm from the entrance side of the driver's seat a, and a left side crawler. An operating lever c for forward and backward movement, an operating lever d for forward and backward movement of the right crawler, an operating lever e for operating the bucket cart and boom, etc. are arranged.

When ending or interrupting the operation of the construction machine, the operator operates the engine throttle lever f to stop the engine, and then operates each operating lever b, c, d,
e should have been locked to prevent accidents due to incorrect operation.

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

In such a case, if the driver accidentally operates control levers b, c, d, and e, or if the driver's clothes get caught on control levers b and e, the upper revolving structure may rotate due to its own weight. Otherwise, it may move and be dangerous. 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]

The present invention provides a reach rod that has an operating lever bending mechanism installed on the operating lever at the entrance/exit of the driver's cab so that the operator cannot exit the cab without operating the operating lever bending mechanism. By interlocking the mechanism that fixes the levers, the driver must operate the operating lever bending mechanism whenever he exits the driver's cab, ensuring that each operating lever is locked and moving the operating lever on the driver's cab entrance/exit side. This applies to operation control lever devices for construction machinery, etc. that facilitate entry and exit.

〔Example〕

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

2 to 6 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 modified cross-shaped safety lock lever 9 having four long and short arms 5, 6, 7, 8 is attached to the casing 4 of the operating lever 1 on the side of the entrance/exit 3 of the driver's cab 2 with a bracket and pin 10 to the entrance/exit surface of the driver's cab. The arms 5, 6, 7, and 8 are pivoted at the intersections thereof so that they can freely rotate along the long arm 5, and the long arm 5 can block access to the driver's cab.

The reach rod 11, which is operated by the forward and backward movement of the operating lever 1, is divided into two halves and can be bent by pivoting a pin 12, and springs 13 are tensioned at the upper and lower parts of the safety lock lever 9 pivoting part side of the pin pivoting part of the reach rod 11. , tension is applied to the reach rod 11. A roller 14 is provided on the side of the arm 6 of the safety lock lever 9 on the side opposite to the side where the spring 13 of the reach rod 11 is attached.
When the long arm 5 of the safety lock lever 9 is rotated from the unlocking position F to the locking position L, the roller 14 moves to the reach rod 11.
When pressed, the reach rod 11 is bent at the pin pivot point, and the operating lever 1 is moved rearward.

Reach rods 17 of control valves 15, 16 operated by respective operating levers 1, 1',
18, 19, 20, 21, 22, circular piece 23
Each piece 23 is connected to each reach rod 17, 18,
19, 20, 21, and 22 with screws 24 so as to be located on a straight line orthogonal to each other, and as shown in FIGS. 5 and 6, a recess 2 into which the piece 23 can fit.
A lever 26 having a lever 26 provided at one end is pivoted to the frame 28 of the construction machine by a pin 27 so as to be rotatable and fit with each of the pieces 23, respectively, and the other end of each lever 26 is attached to a frame 28 of the construction machine. The levers 26 are connected at required intervals by rods 29, and each lever 26 can be rotated by pushing or pulling the rods 29.

A push-pull cable 3 is connected to one end of the rod 29.
0, the outer cylinder 31 of the cable 30 is fixed to the frame 28 with a bracket 32, the other end of the cable 30 is connected to the short arm 7 of the safety lock lever 9, and the outer cylinder 31 of the cable 30 is connected to the short arm 7 of the safety lock lever 9. is fixed to the casing 4 with the bracket 33, and when the safety lock lever 9 is rotated, the push-pull cable 30 pushes and pulls the rod 29, and each lever 26 is rotated so that the recess 25 of the lever 26 is It is designed to fit into and separate from a piece 23 fixed to each reach rod 17.

Here, the relationship between the rotational position of the safety lock lever 9 and the position of each lever 26 is as follows.
When the levers 2 are rotated backwards to the locked position L to facilitate the driver's entry and exit into the driver's cab 2, each lever 2
When the recess 25 of each lever 26 and each piece 23 are fitted into each other, and when the safety lock lever 9 is rotated forward to the unlocked position F to make it difficult to come out of the driver's cab 2, the recess 25 of each lever 26 and Each piece 23 is arranged to separate from the other pieces.

Further, a pin 34 is installed in the casing 4 above the pivot point of the pin 10 of the safety lock lever 9, and a spring 35 is tensioned between the pin 34 and the short arm 8 of the safety lock lever 9. When the lock is rotated to the lock position L or the unlock position F, a backlock action is activated by the tension of the spring 35, respectively.

With the construction as described above, the operator who has stopped the operation of the construction machine is prevented from exiting the operator's cab 2 because the safety lock lever 9 is in the unlocked position F. Therefore, when leaving the driver's cab 2, the driver must always rotate the safety lock lever 9 to the lock position L.

When the safety lock lever 9 is rotated to the lock position L, the push-pull cable 30 connected to the short arm 7 of the safety lock lever 9 is pushed, and the rod 2 connected to the other end of the push-pull cable 30 is pushed.
9 is pushed to the side opposite to the cable 30, each lever 26 connected to the rod 29 rotates about the pin 27, and the concave portion 25 at the tip of each lever 26 engages each reach rod 17, 18, 19, 20. ,21,22
Each reach rod is fitted with a piece 23 fixed thereto, and movement of each reach rod in the axial direction is restrained, and the operating lever is placed in a locked state.

At the same time, as shown in Figure 7, the safety lock lever 9
The roller 14 attached to the arm 6 of the driver is rotated to push the reach rod 11, which bends at the pin pivot joint, and the operating lever 1 is moved rearward. It gets out of the way.

Next, when the driver takes the driver's seat and starts driving, the safety lock lever 9 is moved to the lock release position F.
When the push-pull cable 30 is rotated until it is rotated, the push-pull cable 30 is pulled out and the rod 29
0 side, and the concave portion 25 of each lever 26 is
3 and the operating lever is released from the locked state, making it possible to operate the construction machine. At the same time, the bending force of the arm 6 of the safety lock lever 9 by the roller 14 is released, the reach rod 11 is returned from the bent state to the straight state by the spring 13, and the operating lever 1 is also returned from the retracted position to the operating position. It becomes possible to drive the vehicle.

In the unlocked state, the safety lock lever 9 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 or need to lock some of the operating levers 1, use the pieces 23 attached to the reach rods 17 to 22 connected to the operating levers 1 that are not locked. After loosening the screw 24 and moving the piece 23 to a position unrelated to the operation of the lever 26,
4 and fixing the piece 23, 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 9 is added inside the driver's cab 2, and the safety lock lever 9 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.

Furthermore, in the driving operation lever device of the present invention, when the safety lock lever 9 is rotated to the lock position, the bendable reach rod 11 is bent and moves the operation lever 1 backward, so that the operation lever 1 can be used when the driver gets on or off the vehicle. will no longer be a hindrance.

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 in any position as long as it does not obstruct entry and exit and does not impede operation. It goes without saying that various modifications may be made without departing from the gist of the present invention, such as being able to attach it to any position and in any direction, or using links instead of push-pull cables.

[Effect of idea]

As described above, the operation control lever device for construction machinery, etc. of the present invention can achieve various excellent effects as described below.

() The reach rod of the operating lever on the driver's cab entrance side is bendable, and a safety lock lever is provided on the casing of the operating lever so that the operator cannot exit the cab unless the safety lock lever is operated. By bending the reach rod and retracting the operating lever, the mechanism for fixing the reach rod for operating the control valve is linked, so the safety lock lever is blocked when the driver attempts to exit the cab. The control lever is reliably locked by the fixing mechanism at the same time as it is rotated to the position, so it is impossible to forget to lock the control lever as in the past, and accidents caused by incorrect operation of the control lever when the operation is stopped are prevented. can do.

() At the same time as the control lever is locked, the control lever on the driver's cab entrance side can also be moved backwards.
Even if the control levers are located on both sides of the driver's seat and would obstruct the driver when getting on and off, the driver can easily get on and off the vehicle.

() By shifting the position of the piece to a position unrelated to the operation of the lever, the lock of the corresponding operating lever can be released.

() Since the only thing added to the operator's cab is the safety lock lever that rotates along the entrance/exit surface, it is possible to prevent any hindrance to the operation work.

() When the safety lock lever is rotated to the safety lock position, the reach rod bends and moves the operating lever rearward, thereby preventing the operating lever from interfering with the driver's getting on and off the vehicle.

[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 detailed view of the part shown in Fig. 2, and Fig. 5 is 3
The - direction arrow view of the figure, Figure 6 is the - direction of Figure 5.
The direction arrow view, FIG. 7 is an explanatory view showing the locked state of the safety lock lever in FIG. 2. 1 and 1' are operating levers, 2 is a driver's cab, 3 is an entrance/exit, 9 is a safety lock lever, 11 is a reach rod, 14 is a roller, 17 to 22 are reach rods,
23 is a piece, 25 is a recess, 26 is a lever, 29 is a rod, and 30 is a push-pull cable.

Claims (1)

[Scope of utility model registration request] A reach rod that moves vertically by the back and forth movement of an operating lever located on the driver's cabin entrance side of the driver's seat can be bent, and a piece is attached to the reach rod for controlling control valve switching with a screw, and a recess is fitted into the piece. A lever having a lever at one end is rotatably attached to a frame of a construction machine, etc., and a fixing mechanism is provided which can restrain the movement of the reach rod in the axial direction by engagement of the piece with the lever recess; A safety lock lever is disposed on the casing of the operating lever so as to be able to rotate along the driver's cabin entrance surface and bend the reach rod, and the safety lock lever and the fixing mechanism are connected to each other so that the safety lock lever prevents the driver from getting on and off the vehicle. When the safety lock lever is in the position, the locking mechanism is released, and when the safety lock lever is in a position where it does not interfere with the driver's getting on and off, the locking mechanism is activated and connected to lock the operating lever, and the safety lock lever is in the lock position. An operation control lever device for construction machinery, etc., characterized in that the bendable reach rod is bent to move the control lever rearward.