JPH0118688Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The invention is equipped with a lever lock safety device for locking the operating lever of a construction machine such as a hydraulic excavator having an upper revolving body, and is linked to an engine throttle lever. This invention relates to operation lever devices for construction machinery, etc.

[Prior art]

As shown in Fig. 1, the operating levers of construction machinery such as hydraulic excavators that have a rotating upper body include the operating lever b that controls the left and right rotation of the upper rotating body and the up and down movement of the arm from the entrance side of the driver's seat a, and the lever b that controls the forward and backward movement of the left crawler. Operation lever c, operation lever d for forward and backward movement of the right crawler,
An operating lever e, etc. for operating the bucket and boom 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 had to be locked to prevent accidents due to malfunction.

However, since the driver can relatively freely enter and exit the operator's cab of conventional construction machinery, after the driver stops the engine using the engine throttle lever f, each operating lever b, c, d, e I often forget to lock my 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]

The present invention provides a machine for fixing the reach rod that operates the control valve, and by interlocking the fixing machine and the engine throttle lever, when the engine is stopped, the fixing mechanism operates and locks each operating lever. The present invention relates to an operating lever device for construction machinery, etc.

〔Example〕

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

FIGS. 2 to 5 show an embodiment of the present invention, and are an example of a construction machine in which operating levers 1 and 2 are disposed on both sides of a driver.

each reach rod 7 of the control valve 5, 6 operated by each operating lever 1, 2, 3, 4;
8, 9, 10, 11, 12, the ring-shaped pieces 13 are connected to the reach rods 7, 8, 9, 10,
A cylindrical member is provided with a lever 16 which is fixed with screws 14 so as to be positioned on a straight line orthogonal to the levers 11 and 12, and has a recess 15 at one end that can fit with the piece 13 as shown in FIGS. 4 and 5. A lock lever 20 is fixed to the longitudinal direction of the outer circumferential surface of the cylindrical member 17 and is formed by fitting a bracket 19 having a long hole 18 onto the outer periphery of the cylindrical member 17 in a direction perpendicular to the mounting direction of the lever 16. The frame 22 of the construction machine is rotatably connected to each piece 13 and the recess 15.
The rods 24 are pivoted so that they can be fitted into each other, and pins 23 are installed at required intervals. It is arranged so that you can get it.

A pin 25 is installed at the upper end of the boss portion 30 of the pin 21 that locks each lock lever 20, and a pin 26 is installed at the upper side near the intermediate portion of the elongated hole 18 of the bracket 19 of each lock lever 20. ,26
A spring 27 is provided in between, and when the recess 15 of each lock lever 20 is fitted with each piece 13, the spring 27 is inserted into the recess 1 as shown in FIG.
5 and the piece 13 are placed in a position where tension is applied in the direction in which they are further fitted together. Furthermore, when the recess 15 is fitted with the piece 13, the bottom surface of the recess 15 is brought into contact with the outer circumferential surface of the piece 13, and the rotation range of the lever 16 is such that the piece 13 is divided by a plane in the axial direction of the reach rod 11. Only one side of the case is considered.

One end of the push-pull cable 28 is connected to one end of the rod 24, and the other end of the push-pull cable 28 is connected to an engine throttle lever 29 provided in the driver's cab, and the engine throttle lever 29 is operated. The rod 24 is moved in conjunction with the lock lever 20, and each lock lever 20 is rotated so that the recess 15 of the lever 16 can be fitted into and removed from the piece 13, respectively.

Here, the relationship between the operating position of the engine throttle lever 29 and the position of each lock lever 20 is such that when the engine throttle lever 29 is rotated to the stop position S to stop the engine, each lock lever 20 is
When the engine throttle lever 29 is rotated to the high idle position H, the recesses 15 and the pieces 1 are fitted into each other.
3 and 3 are arranged to separate from each other.

With the above configuration, when stopping a construction machine that has been operating with the engine throttle lever 29 rotated to the high idle position H, when the engine throttle lever 29 is rotated to the stop position S, The push-pull cable 28 connected to the lower part of the engine throttle lever 29 is pulled, and the rod 24 connected to the other end of the push-pull cable 28 moves to the cable 28 side and is inserted into the rod 24. The brackets 19 of each lock lever 20 are rotated in the same direction by the provided pins 23, and the lever 16, which is integrally fixed via the brackets 19 and the cylindrical member 17, is rotated in a direction approaching the piece 13, The recess 15 of the lever 16 and the piece 1
3 are fitted, and the movement of each reach rod 7, 8, 9, 10, 11, 12 in the axial direction to which each piece 13 is fixed is restrained, and each operating lever 1, 2,
3 and 4 are in a locked state.

The lock lever 20 rotates to connect the recess 15 and the piece 13.
When the rod 2 is in the fitted state, the tension of the spring 27 strengthens the fitting force, so the engine throttle lever 29 is returned to the neutral position N, and the push-pull cable 28 that has been pushed back moves the rod 2
4 is moved in the anti-push-pull cable 28 direction, the pin 23 remains in the elongated hole 1 of the bracket 19.
Since the bracket 19 is not rotated by simply moving from right to left in FIG. 5 within the bracket 8, the locked state is maintained.

Furthermore, when the engine throttle lever 29 is rotated to the high idle position H, the push-pull cable 28 is further pushed back, and the rod 24 overcomes the tension of the spring 27 and moves in the anti-push-pull cable 28 direction. 23, the bracket 19 is rotated in the same direction, and the lever 1 is rotated in the direction of the push-pull cable 28, so that the recess 1
5 and piece 13 are separated and the locked state is released. In this released state, the spring 27 is located on the opposite side of the pin 21 from when it was in the locked state, and tension in the releasing direction acts on the lock lever 20, so that the engine throttle lever 29 is moved from the high idle position H to the neutral position. Even if it is returned to position N, pin 23
By simply moving from left to right in FIG. 5 within the elongated hole 18, the unlocked state is maintained without becoming locked.

Therefore, the lock is set to be released when the engine is running from a low speed to a high speed, and to be locked when the engine is from a low speed to a stop.

Note that the operating control lever device for construction machinery, etc. of the present invention is not limited to the above-described embodiment, and if it is not necessary to lock all the reach rods, the fixed position of the reach rod piece that does not lock can be moved. Of course, various modifications may be made without departing from the gist of the present invention, such as fixing the piece only to the reach rod to be locked (for example, a reach rod for swing drive).

[Effect of idea]

As described above, according to the operating lever device for construction machinery, etc. of the present invention, a mechanism for fixing the reach rod that operates the control valve is provided, and the fixing mechanism and the engine throttle lever are linked. Therefore, when stopping operation, the operating lever can be reliably locked at the same time as the engine throttle lever is rotated to the engine stop position, and it is impossible to forget to lock the operating lever as in the past. Various excellent effects can be achieved, such as being able to prevent accidents caused by erroneous operation of the lever.

[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
It is a -direction arrow view of a figure. 1 to 4 are operating levers, 5 and 6 are control valves, 7 to 12 are reach rods, 13 is a piece, 15
16 is a recess, 16 is a lever, 18 is a long hole, 19 is a bracket, 20 is a lock lever, 23 is a pin, 24
28 is a push-pull cable, and 29 is an engine throttle lever.

Claims (1)

[Scope of utility model registration request] An engine throttle lever and a fixing mechanism disposed on a reach rod for controlling control valve switching operated by an operating lever so as to restrain the movement of the reach rod in the axial direction are fixed when the engine throttle lever is at the engine stop position. The engine throttle lever is connected so that the operating lever can be locked by the fixing mechanism at one time, and the operating lever is unlocked by the fixing mechanism when the engine throttle lever is in the engine operating position. Operation control lever device for construction machinery, etc.