JPH1136368A - Operation lever device of construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the controllability of an operation lever of which position against the drive seat can be appropriately adjusted. SOLUTION: Each lever 29 is fitted to a lever stand 24 to be inclinable in the forward or rearward direction and selectively positioned in a plurality of inclined positions. In this way, respective levers 29 can be operated at positions appropriate for operators' physiques. And hence, the operator's fatigue can be reduced and the operability can be incleased. When an operator gets in the drive seat 20 or out thereof, the operator's movement into the drive seat can be made rapid and safe, by containing the levers 29 in the lever stand 24 so as not to obstruct his movement.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation lever device for a construction machine, which is provided in a construction machine such as a hydraulic shovel and is preferably used to control the operation of the construction machine.

[0002]

2. Description of the Related Art Generally, construction machines such as hydraulic excavators are
A lower traveling body, an upper revolving body rotatably provided on the lower traveling body, and a working device provided on the upper revolving body so as to be able to ascend and descend are roughly constituted. In this type of construction machine, a traveling operation of a lower traveling body is usually controlled by a traveling operation lever device disposed in front of a driver's seat, and a work operation disposed in a side of the driver's seat. The turning operation of the upper turning body, the operation of the working device, and the like are controlled by the operating lever device.

[0003] Such a conventional operation lever device for work usually comprises a lever stand provided on the left and right sides of a driver's seat, an operation lever provided on the lever stand and operated by an operator, and the like. I have.

However, in the above-described operation lever device according to the related art, since the operation lever extends forward from the lever stand, the operation lever becomes an obstacle when the operator gets on and off the driver's seat, and the operation lever is quickly operated. There is a problem that getting on and off is hindered.

On the other hand, as another prior art, for example, Japanese Unexamined Utility Model Publication No. Hei 3-50225 discloses an entire lever stand on which an operation lever is mounted so as to be rotatable up and down around a base of a driver's seat as a fulcrum. By rotating the lever stand to a position that does not hinder getting on and off the driver's seat,
There is disclosed an operation lever device capable of quickly getting on and off a driver's seat.

[0006]

However, in the operation lever device according to the other prior art described above, the entire heavy lever stand is rotationally displaced in order to move the operation lever to a position where the operation lever does not hinder getting into and out of the driver's seat. There is a problem that complicated work is required.

Further, in another conventional operating lever device, the operating lever is mounted on the lever stand at a specific angle and cannot be adjusted, so that the mounting angle cannot be adjusted. Alternatively, the position in the vertical direction may not be suitable for the physique of the worker sitting in the driver's seat.

In particular, in recent years, the opportunity for small female workers to operate construction machines has increased, and for such female workers, the operation of the operation lever at a position that does not conform to the physique has been smoothly performed. It is difficult to perform the operation, and there is a problem that frequent lever operation or the like becomes a burden and the operator is easily tired.

The present invention has been made in view of the above-described problems of the prior art, and can appropriately adjust the position of an operation lever with respect to a driver's seat, improve operability, and improve the operability when getting on and off the driver's seat. It is an object of the present invention to provide an operation lever device for a construction machine which can prevent the operation lever from being hindered.

[0010]

According to a first aspect of the present invention, there is provided a lever stand provided on at least one side of a driver's seat provided in a construction machine in the left-right direction. An operation lever operated from the driver's seat to operate a construction machine, a tilt support mechanism that supports the operation lever so as to be able to tilt in the front-rear direction with respect to the lever stand, and between the lever stand and the operation lever. And a lock mechanism that adjustably positions a tilt position of the operation lever with respect to a lever stand when the operation lever is tilted by the tilt support mechanism.

With this configuration, the operation lever can be tilted with respect to the lever stand by the tilt support mechanism, and the operation lever can be positioned at a desired tilt position by the lock mechanism. Thereby, the position of the operation lever can be adjusted so that the position in the front-rear direction and the vertical direction of the operation lever matches the physical size of the worker sitting in the driver's seat. Moreover, the operation lever can be easily moved to a position where it does not hinder the getting on / off of the driver's seat or the like only by tilting the operation lever with respect to the lever stand.

According to a second aspect of the present invention, the lever stand is formed as a hollow box in which the operation lever can be stored, and the tilting support mechanism has an operation allowable position in which the operation lever can be operated from a driver's seat and the inside of the lever stand. In a configuration in which it is supported so as to be able to tilt between the storage position where it is stored.

With this configuration, the operation lever supported by the tilt support mechanism is always positioned at the operation allowable position and is operated from the driver's seat, and is positioned at the storage position when getting on and off the driver's seat. Accordingly, the operating lever can be stored in the lever stand when getting on and off the driver's seat, and getting on and off the driver's seat can be performed quickly.

Further, according to a third aspect of the present invention, the tilt support mechanism includes an engaging portion provided on both left and right sides of the lever stand.
And an engaged portion provided on the operating lever and supported by the engaging portion so as to be tiltable.

With this configuration, it is possible to adjust the position of the operating lever to a desired tilt position while tilting the operating lever about the engaged portion supported by the engaging portion of the lever stand.

According to a fourth aspect of the present invention, the lock mechanism selectively engages with the plurality of positioning holes provided on the lever stand centering on the engaging portion and the respective positioning holes provided on the operation lever. And an engaging pin.

With this configuration, the engaging pin provided on the operation lever is engaged with one of the positioning holes provided on the lever stand, and the operation lever is positioned at a desired tilt position with respect to the lever stand. can do.

According to a fifth aspect of the present invention, during the positioning operation of positioning the operation lever at the tilting position by the lock mechanism, the operation signal is prohibited from being output to the outside from the operation lever, and the operation lever is moved to the desired tilting position. The present invention is configured to include a signal output unit that allows an operation signal to be output from the operation lever when the positioning operation is completed.

With this configuration, it is possible to prevent the operation signal from being output from the operation lever to the outside when the tilt position of the operation lever with respect to the lever stand is being adjusted.

Further, in the invention according to claim 6, the lock mechanism includes an operation allowable position at which the operation lever can be operated from a driver's seat, a storage position for storing the operation lever in a lever stand, and an operation prohibition for prohibiting operation from the driver's seat. Position, and the signal output means prohibits an operation signal from being output to the outside from the operation lever when the operation lever is positioned at the storage position or the operation prohibition position. The present invention is configured to allow an operation signal to be output to the outside from the operation lever when positioned at the operation allowable position.

With this configuration, for example, when the operating lever is positioned at the retracted position when getting on or off the driver's seat, or when the operating lever is positioned at the operation prohibiting position during inspection work, the operating lever is erroneously contacted. Even if it does, the operation signal can be prevented from being output to the outside from the operation lever.

[0022]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIGS. 1 to 7 show a case in which the operating lever device according to the embodiment of the present invention is provided in the cab of a hydraulic shovel.

In the drawing, reference numeral 1 denotes a lower traveling body of a hydraulic shovel, 2 denotes an upper revolving body mounted on the lower traveling body 1 so as to be pivotable, and the upper revolving body 2 has a revolving frame 3; An operator cab 4, a machine room 5, a counterweight 6, and the like are provided on 3.

Reference numeral 7 denotes a working device provided at the front of the upper revolving unit 2 so as to be able to move upward and downward. The working device 7 includes a boom 8 which is pin-connected to the front center of the turning frame 3 so as to be able to move upward and downward. The arm 9 is roughly constituted by an arm 9 rotatably pin-connected to the distal end of the boom 8 and a bucket 10 rotatably pin-connected to the distal end of the arm 9.

The operator cab 4 has a floor panel 11 and a front panel 1.
2. Rear plate 13, left and right side plates 14, and ceiling plate 15
The left side plate 14 is provided with a door 14 </ b> A for a driver to get in and out of the cab 4.

Reference numeral 16 denotes a control device provided in the cab 4. The control device 16 can be moved in the front-rear direction on the floor plate 11 via a slide mechanism 17, as shown in FIGS. Slide table 18 provided on the slide table 1
And a driver's seat 20 provided on the top 8 via a slide mechanism 19 so as to be movable in the front-rear direction. The driver's seat 20 includes a seat 20A on which an operator sits, a backrest 20B erected at the rear of the seat 20A, and armrests 20C provided on both left and right sides of the backrest 20B.
20C. Then, by moving the slide table 18 in the front-rear direction with respect to the floor plate 11 or by moving the driver's seat 20 in the front-rear direction with respect to the slide table 18, the driver's seat 20 in the driver's The position can be adjusted.

Reference numeral 21 denotes a travel pedal provided on the floor plate 11 in front of the control device 16, and a travel lever 22 is attached to the travel pedal 21. Then, the operator seated on the driver's seat 20 is
Alternatively, by operating the traveling lever 22, the traveling direction and traveling speed of the lower traveling body 1 are controlled.

Reference numeral 23 denotes a work operation lever device disposed on the left and right sides of the driver's seat 20.
3 is a slide table 18 located on the left and right sides of the driver's seat 20.
, And an operation lever 29 described later provided on each lever stand 24.

Here, as shown in FIG. 5, the lever stand 24 is formed as a hollow box having left and right side plates 25, 25, a rear plate 26 and the like. The base ends of the flat flexible covers 27, 27 made of a rubber material or the like are adhered to the front edge and the upper edge of each side plate 25,
The distal end side of each flexible cover 27 is openably and closably abutted between the left and right side plates 25. Further, a rod fitting hole 28 is formed in each side plate 25 of the lever stand 24 so that a support rod 35 described later is slidably fitted.

Reference numerals 29, 29 denote operation levers provided on the left and right lever stands 24, respectively.
Reference numeral 9 denotes a cubic base 30 attached to the lever stand 24, and an operation rod 31 provided on the base 30 so as to be tiltable and gripped by an operator, between the base 30 and the operation rod 31. Is a dustproof cover 3 made of a rubber material or the like.
2 are provided.

Here, one of the operation levers 29 is
As shown in FIG. 6, the bucket 10 is controlled by tilting the operation rod 31 in the directions indicated by arrows Kx1 and Kx2 (forward and rearward), and tilted in the directions indicated by arrows Ky1 and Ky2 (left and right). By doing so, the boom 8 is controlled. The other operation lever 29 controls the arm 9 by tilting the operation rod 31 in the directions indicated by arrows Kx1 and Kx2 (forward and rearward), and in the directions indicated by arrows Ky1 and Ky2 (left and right). By tilting, the swing operation of the upper swing body 2 is controlled.

A displacement sensor (not shown) such as a potentiometer for detecting the tilt of the operating rod 31 in four directions indicated by arrows Kx1, Kx2, Ky1, and Ky2 is provided in the base 30 of each operating lever 29. ) Are arranged. A drive power supply 33 is connected to each displacement sensor, and outputs an operation signal corresponding to the amount of tilt of each operation rod 31 to the outside via cables 34, 34,. Each cable 34 is connected to a controller (not shown) for switching and controlling, for example, a bucket control valve, a boom control valve, an arm control valve, or a swing motor control valve. Pressure oil from a hydraulic pump (not shown) is supplied to and discharged from a bucket cylinder, a boom cylinder, an arm cylinder, a swing motor, and the like.

Reference numerals 35, 35 denote support rods provided on the base 30 of the operation lever 29. Each support rod 35 tilts and supports together with a rod fitting hole 28 formed in each side plate 25 of the lever stand 24. It constitutes the mechanism. Then, as shown in FIG. 7, each support rod 35 is formed in a rod fitting hole 2 formed in each side plate 25 of the lever stand 24.
8, the operation lever 29 is attached so as to be tiltable in the front-rear direction about the support rod 35.

That is, in this embodiment, the lever stand 24
The rod fitting hole 28 provided on the operation lever 29 serves as an engagement portion of the tilting support mechanism, and the support rod 35 provided on the base 30 of the operation lever 29.
Are engaged portions.

Reference numeral 36 denotes the lever stand 24 and the operation lever 2
The lock mechanism 36 is provided between the side plates 2 of the lever stand 24.
5 and a plurality of positioning holes 37 formed in the operation lever 2.
9 are provided on the base 30 so as to be able to advance and retreat.
And a lock pin 38 to be described later, which selectively positions the operation lever 29 at a plurality of rotation positions with respect to the lever stand 24 by engaging with any one of the above.

Here, as shown in FIGS. 4 and 5, for example, eight positioning holes 37 are formed on a circumference having a constant radius from the axial center of the rod fitting hole 28. Of the 37, four located in the middle angle range θa are positioning holes 37A for the operation allowable position, and two located in the rear angle range θb are positioning holes 37 for the storage position.
B, two of which are located within the front angle range θc are the positioning holes 37C for the operation prohibition position.

When the lock pin 38 is engaged with any one of the positioning holes 37A, the operation lever 29
Is positioned at a position indicated by a solid line and a dashed line in FIG. When the lock pin 38 is engaged with any one of the positioning holes 37B, the operation lever 29 is positioned at the storage position stored in the lever stand 24 as shown by a two-dot chain line. Further, when the lock pin 38 is engaged with any of the positioning holes 37C, the operation lever 29 prohibits the operation from the position protruding forward of the lever stand 24 as shown by the two-dot chain line, that is, the operation from the driver's seat 20. The operation is prohibited.

Reference numerals 38, 38 denote lock pins provided on the base 30 of the operation lever 29 in the vicinity of the support rods 35. Each lock pin 38 is provided inside the base 30, as shown in FIG. A pair of arms 39, 39 movably provided in the left-right direction are provided at the distal ends of the pair of arms 39, 39.
It is constantly urged by the direction 40 so as to protrude outside the base 30. Here, the base end side of each arm 39 is connected to the base 3
0 is connected to the outer periphery of a rotary plate 42 rotatably provided around a shaft 41. The rotary plate 42 is rotated in the direction of arrow A, and the arm 39 is opposed to the compression spring 40 by arrow B. By moving in the direction, the lock pin 38 is drawn into the base 30.

Reference numeral 43 denotes a gear coaxially mounted on the rotary plate 42. The gear 43 is a rack formed at one end of a connecting arm 44 which is located inside the base 30 and is movably provided in the direction of arrow C. 45. The other end of the connecting arm 44 is connected to the operating rod 31 provided on the base 30.
It is connected to a lock release button 46 provided to be movable in the axial direction outside the operation rod 31.

Therefore, the lock pin 38 always projects in the left-right direction from the side surface of the base 30 by the compression spring 40,
By engaging one of the positioning holes 37 formed in the side plate 25 of the lever stand 24, the operation lever 29 is positioned at a desired tilt position. When the connection arm 44 is moved in the direction of arrow C by the lock release button 46, and the rotating plate 42 is rotated in the direction of arrow A by the engagement of the rack 45 of the connection arm 44 and the gear 43, the lock pin 38 is compressed by the compression spring 40. The operation lever 29 can be tilted with respect to the lever stand 24 by being drawn into the base 30 and being separated from the positioning hole 37 against the lever stand 24.

Reference numerals 47 and 48 denote signal output devices for controlling the output of operation signals from the respective operation levers 29. As shown in FIG.
9 and a drive power supply 33 in series.

Here, the signal output device 47 is composed of an aggregate of four switches 47A connected in parallel, and each of the switches 47A is provided between one (left) operation lever 29 and the lever stand 24. Of the positioning holes 37 that constitute the lock mechanism 36, one is disposed in each of the four operation allowable position positioning holes 37A located within the angle range θa (see FIG. 7). When the lock pin 38 is engaged with one of the positioning holes 37A, that is, when one of the operation levers 29 is positioned at the operation allowable position, one of the switches 47A is selectively closed. Configuration.

On the other hand, the signal output device 48 is composed of an aggregate of four switches 48A connected in parallel, and each of the switches 48A is provided between the operation lever 29 on the other side (right side) and the lever stand 24. Of the positioning holes 37 constituting the locking mechanism 36, one is disposed in each of the four operation allowable position positioning holes 37A located within the angle range θa. When the lock pin 38 is engaged with one of the positioning holes 37A, that is, when the other operation lever 29 is positioned at the operation allowable position, one of the switches 48A is selectively closed. Configuration.

Accordingly, when the signal output devices 47 and 48 are performing a positioning operation for positioning the left and right operation levers 29 to the operation allowable positions within the angle range θa, each of the operation levers 29 is in the angle range. When the operation lever 29 is positioned at the storage position within θb and the operation prohibition position within the angle range θc, the output of the operation signal from each operation lever 29 is prohibited. On the other hand, when the operation of positioning each operation lever 29 at any one of the four operation allowable positions within the angle range θa is completed, the operation signal corresponding to the amount of tilt of each operation lever 29 is output. Things.

The operation lever device of the construction machine according to the present embodiment has the above-described configuration. Next, the operation thereof will be described.

First, when positioning the operation lever 29 to the operation allowable position, the operator presses the lock release button 46 provided on the operation rod 31 of the operation lever 29 in the axial direction, and moves the connecting arm 44 in FIG. The lock pin 38 is pulled into the base 30 by moving the lock pin 38 in the direction of the arrow C in FIG.
In this state, the operation lever 29 is tilted with respect to the lever stand 24, the lock release button 46 is released within the angle range θa in FIG. 4, and the lock pin 38 is engaged with any of the four positioning holes 37A. By doing so, the operation lever 29 can be positioned at the operation allowable position indicated by the solid line and the dashed line in FIG.

When the operation of positioning the left and right operation levers 29 at the operation allowable positions (any of the four positioning holes 37A) is completed, the signal output device 47 is set.
And one of the switches 48A constituting the signal output device 48 are closed by the lock pin 38. As a result, an operation signal is output from each operation lever 29, and the turning operation of the upper turning body 2 and the operation of the boom 8, the arm 9, and the bucket 10 of the working device 7 are performed according to the operation amount at this time. Excavation work such as earth and sand is performed under control.

Thus, by positioning each operation lever 29 at a desired operation allowable position, the position of the operation lever 29 in the front-rear direction and the vertical direction is appropriately adjusted according to the physique of the worker sitting in the driver's seat 20. can do. Accordingly, the operator can operate the operation lever 29 at a position where it is easy to operate, so that fatigue during excavation work or the like can be reduced, and workability can be improved.

Further, in this embodiment, each operating lever 29
The operation lever 2 is disposed between the displacement sensor of the
Signal output devices 47 and 48 are provided to allow the operation signals to be output from the respective operation levers 29 when the 9 is positioned at the operation allowable position. Thereby, each operation lever 2
When the positioning operation of No. 9 is performed, an operation signal is erroneously output to the outside, and it is possible to reliably prevent the working device 7 and the like from inadvertently operating.

Next, when the operator moves the operation lever 29 out of the way, for example, when the operator gets on or off the driver's seat 20 or performs an inspection work or the like in the cab 4, Presses the lock release button 46 to move the connecting arm 44 in the direction of arrow C in FIG. 7, thereby releasing the lock pin 38 from the positioning hole 37A. In this state, the operation lever 29 is moved to the lever stand 24.
4, the lock release button 46 is released within the angle range θb in FIG. 4, and the lock pin 38 is engaged with one of the two positioning holes 37B. It can be positioned at the storage position indicated by the two-dot chain line (any one of the two positioning holes 37B). Similarly, the operation lever 29 is tilted with respect to the lever stand 24, and the angle range θ in FIG.
4C, the lock release button 46 is released, and the lock pin 38 is engaged with one of the two positioning holes 37C, so that the operation lever 29 is moved to the operation prohibition position (two dashed lines in FIG. 4). (Any position of the positioning hole 37C)
Can be positioned.

Thus, when the operator gets on or off the driver's seat 20 or performs an inspection work or the like in the driver's cab 4, the operator only tilts the operation lever 29 with respect to the lever stand 24 and operates the operation lever 29. It can be stored easily out of the way, for example, in the lever stand 24, so that getting on and off the driver's seat 20 and checking work in the cab 4 can be performed quickly and safely.

Further, when the operation lever 29 is positioned at the storage position or the operation prohibition position, the switches 47A constituting the signal output device 47 or the switches 48A constituting the signal output device 48 are both opened. And the output of the operation signal from each operation lever 29 is prohibited.

Thus, even if the operator accidentally comes into contact with the operation lever 29 when the operator gets on or off the driver's seat 20 or performs an inspection work or the like in the driver's cab 4, the operation lever 29 is It is possible to reliably prevent the operation signal from being output to the outside and inadvertent operation of the working device 7 and the like.

Thus, according to the present embodiment, each operating lever 29 is attached to the lever stand 24 so as to be tiltable in the front-rear direction, and each operating lever 29 is locked by the lock mechanism 36.
Is selectively positioned at a plurality of tilting positions, so that the operating lever 2 can be appropriately adjusted to suit the physique of the operator.
9 can be performed. Accordingly, each of the operation levers 29 can be operated at a position suitable for the physique of the worker, and thus fatigue of the worker can be reduced and workability can be improved.

When the operator gets on or off the driver's seat 20 or performs an inspection work or the like in the cab 4,
By storing each operation lever 29 in the lever stand 24 so as not to be in the way, it is possible to get on and off the driver's seat 20,
Inspection work and the like in the cab 4 can be performed quickly and safely.

Further, when each operation lever 29 is in the middle of the operation of positioning, each operation lever 29 is moved to the storage position,
Alternatively, signal output devices 47 and 48 are provided to prohibit the operation signal from being output from each operation lever 29 when the operation lever 29 is positioned at the operation prohibition position. If the operator accidentally touches the operation lever 29 when the operation lever 29 is positioned at the operation prohibition position, the operation lever 2
An operation signal is output from the control unit 9, and it is possible to reliably prevent the working device 7 and the like from inadvertently operating.

In the above embodiment, four positioning holes 37A for positioning the operation lever 29 at the operation allowable position within the angle range θa are provided in each of the positioning holes 37 constituting the lock mechanism 36. Although described in the example, the present invention is not limited to this. For example, three or less or five or more positioning holes 37A may be provided.

Further, in the above-described embodiment, the operation lever device for operating the working device of the hydraulic excavator has been described as an example. However, the present invention is not limited to this, and for example, a wheel loader, a hydraulic crane, a bulldozer, etc. The present invention may be applied to an operation lever device for operating a working device of another construction machine.

[0060]

As described in detail above, according to the first aspect of the present invention, the tilt support mechanism for supporting the operation lever so as to be tiltable in the front-rear direction with respect to the lever stand is provided, and the tilt is supported by the tilt support mechanism. The operation lever is positioned at a desired tilting position by the lock mechanism, so that the position of the operation lever in the front-rear direction and the up-down direction is appropriately adjusted so that the position of the operation lever matches the physical size of the worker seated in the driver's seat. Adjustments can be made. Accordingly, the operation lever can be operated at a position where the operator can easily operate, and the fatigue of the operator can be reduced, and the workability can be improved.

Further, by merely tilting the operation lever with respect to the lever stand, it is possible to easily move the operation lever to a position where it does not hinder getting into and out of the driver's seat or inspection work in the driver's cab. Getting in and out of the vehicle, inspection work in the cab, and the like can be performed quickly.

According to the second aspect of the present invention, the lever stand is formed as a hollow box, and the tilt support mechanism is configured to allow the operation lever to be operated from the driver's seat and to be stored in the lever stand. The operating lever is stored in the lever stand when entering or exiting the driver's seat or during inspection work, so that workers can be inadvertently contacted with the operating lever. It is possible to quickly and safely get on and off the driver's seat and perform inspection work.

According to the third aspect of the present invention, the operation lever is tilted about the engaged portion supported by the engagement portion of the lever stand. The operability of the operation lever can be improved by appropriately adjusting the position so as to match the physique of the worker sitting in the driver's seat.

Further, according to the fourth aspect of the present invention, the operating pin is selectively engaged with the plurality of positioning holes provided in the lever stand centering on the engaging portion, so that the operating lever is selectively engaged. With the configuration in which the lever is positioned at the desired tilting position, the worker seated on the driver's seat engages the engaging pin with any of the positioning holes while moving the operating lever to the desired tilting position. Only with this, the operation lever can be easily and reliably positioned at a position where the operation lever can be easily operated.

According to the fifth aspect of the present invention, during the positioning operation for positioning the operation lever at a desired tilt position, the operation signal is prohibited from being output to the outside from the operation lever, and the positioning operation is completed. In the state, the signal output means that allows the output of the operation signal from the operation lever is provided, so when the position of the operation lever is adjusted, the operation signal is output from the operation lever, and the working device, etc. operates inadvertently Can be reliably prevented, and safety when adjusting the position of the operation lever can be ensured.

Further, according to the present invention, when the operation lever is positioned at the storage position or the operation prohibition position, the operation signal is prohibited from being output to the outside from the operation lever, and the operation lever is moved to the operation allowable position. The operation lever is configured to allow the operation signal to be output to the outside when it is positioned at the position.For example, the operation lever is positioned at the stowed position when getting on or off the driver's seat, or the operation lever is prohibited during inspection work. In the state where the operation lever is positioned, even if the operation lever is inadvertently contacted, the operation signal can be prevented from being output to the outside from the operation lever. Thereby, it is possible to reliably prevent the working device or the like from inadvertently operating at the time of getting on or off the driver's seat or at the time of inspection work, and to secure safety at the time of getting on or off the driver's seat or at the time of inspection work.

[Brief description of the drawings]

FIG. 1 is an external view showing a hydraulic excavator to which an operation lever device of a construction machine according to an embodiment of the present invention is applied.

FIG. 2 is a side view showing a driver's seat, an operation lever, and the like of a control device provided in a cab in FIG. 1;

FIG. 3 is a front view of the control device as viewed from a direction indicated by arrows III-III in FIG. 2;

FIG. 4 is a side view of the control device showing a state where the operation lever is tilted to an operation allowable position, a storage position, and an operation prohibition position.

FIG. 5 is an exploded perspective view showing a lever stand, an operation lever, and the like in an enlarged manner.

FIG. 6 is a circuit diagram showing an operation lever, a driving power supply, a signal output device, and the like.

FIG. 7 is a cross-sectional view showing an operation lever, a lock mechanism, and the like as viewed from a direction indicated by arrows VII-VII in FIG.

[Explanation of symbols]

 Reference Signs List 16 control device 20 driver's seat 24 lever stand 28 rod fitting hole (tilt support mechanism) 29 operating lever 35 support rod (tilt support mechanism) 36 lock mechanism 37 positioning hole 38 lock pin 47, 48 signal output device 47A, 48A switch

Claims (6)

[Claims] 1. A lever stand provided on at least one side in the left-right direction of a driver's seat provided on a construction machine, an operation lever operated from the driver's seat to operate the construction machine, and the operation lever A tilt support mechanism that supports the lever stand so as to be tiltable in the front-rear direction with respect to the lever stand, and a lever of the operation lever that is provided between the lever stand and the operation lever when the operation lever is tilted by the tilt support mechanism. An operation lever device for a construction machine, comprising: a lock mechanism that adjustably positions a tilting position with respect to a stand. 2. The lever stand is formed as a hollow box body capable of storing the operation lever, and the tilt support mechanism stores the operation lever in an operation allowable position where the operation lever can be operated from the driver's seat and in the lever stand. The operation lever device for a construction machine according to claim 1, wherein the operation lever device is configured to be tiltably supported between the storage position and the storage position. 3. The tilt support mechanism includes an engaging portion provided on each of the left and right sides of the lever stand, and an engaged portion provided on the operation lever and supported by the engaging portion so as to be tiltable. The operating lever device for a construction machine according to claim 1 or 2, wherein the operating lever device is provided. 4. A lock mechanism comprising: a plurality of positioning holes provided on the lever stand centering on the engagement portion; and an engagement pin provided on the operation lever to selectively engage with each of the positioning holes. Claims 1 and 2 comprising
Or an operation lever device for a construction machine according to item 3. 5. An operation signal is prohibited from being output to the outside from the operation lever during a positioning operation of positioning the operation lever at a tilt position by the lock mechanism.
The operation lever device for a construction machine according to claim 1, 2, 3, or 4, further comprising a signal output unit configured to output an operation signal from the operation lever when the positioning operation to the desired tilt position is completed. . 6. The lock mechanism includes an operation allowable position at which the operation lever can be operated from the driver's seat, a storage position at which the operation lever is stored in the lever stand, and an operation inhibition position at which operation from the driver's seat is prohibited. And the signal output means prohibits an operation signal from being output to the outside from the operation lever when the operation lever is positioned at the storage position or the operation prohibition position,
The operation lever device for a construction machine according to claim 5, wherein the operation lever is configured to allow an operation signal to be output to the outside when the operation lever is positioned at the operation allowable position.