JPH10280481A - Operation lever device for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To pertinently adjust the position of an operation lever relative to an operator's seat, and improve the operability of the operation lever. SOLUTION: A lever holder 35 fitted with an operation lever 47 is mounted on the forward end of an armrest 24 so as to be capable of turning right and left, and the lever holder 35 is formed to be selectively positioned at a plurality of turning positions. As a result, the right and left positional adjustment of each operation lever 47 can be made to suit the breadth of a worker's shoulders or the like by turning the lever holder 35 right and left, and each operation lever 47 can be tilted at a position suitable for the worker's physical constitution.

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, the operation of the lower traveling structure, the turning operation of the upper revolving structure, the operation of the working device, and the like are controlled by an operation lever device provided in the cab of the upper revolving structure.

[0003] Such an operation lever device according to the prior art usually includes a traveling operation lever device for controlling the traveling operation of a lower traveling body and a working lever device for controlling the turning operation of an upper revolving body, the operation of a working device, and the like. Operating lever device,
The operation lever for traveling is provided on the floor plate of the cab together with the traveling pedal, located in front of the driver's seat.

On the other hand, as described in Japanese Utility Model Laid-Open Publication No. Sho 60-452, for example, the operating lever for work is provided at the distal end of armrests provided on the left and right sides of the driver's seat. The operator who is seated on the armrest tilts the operation lever with the elbow or the like resting on the armrest.

[0005]

By the way, in the above-mentioned prior art, a working operation lever is provided on the left and right sides of the driver's seat on the distal end side of the armrest, and this operation lever is fixed to the driver's seat in the left-right direction. Because it is installed in a position,
The position of each operation lever in the left-right direction of the driver's seat may not always match the physique (shoulder width) of the operator, and it may be difficult for some workers to perform the operation of tilting the operation lever smoothly. However, there is a problem that the operator is liable to be tired due to the burden.

[0006] Further, since the operating lever is located on the left and right sides of the driver's seat and is disposed in front of the driver's seat, the operating lever becomes an obstacle when the operator gets on and off the driver's seat, so that the operator can get on and off quickly. There is a problem that is hindered.

The present invention has been made in view of the above-mentioned 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 at the time of 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.

[0008]

According to a first aspect of the present invention, there is provided an armrest disposed in a driver's cab of a construction machine and disposed on at least one side in a left-right direction of a driver's seat. A lever holder whose base end is attached to the armrest and whose distal end is rotated left and right with respect to the armrest about the base end; and an operation provided on the lever holder and operated on the lever holder And a lever.

According to this structure, the position of the operation lever in the left-right direction with respect to the driver's seat can be arbitrarily adjusted by rotating the distal end side of the lever holder in the left-right direction with respect to the armrest. The operation lever can be arranged at a position where the operation can be easily performed.

A second aspect of the present invention is a lever holder locking mechanism for selectively positioning the lever holder at a plurality of turning positions in front of the armrest between the armrest and a base end of the lever holder. Has been established.

With this configuration, the lever holder can be rotated with respect to the armrest, and can be positioned at any of a plurality of rotation positions by the lever holder lock mechanism. The operation lever can be arranged at a position suitable for the above. In addition, for example, the operation lever or the like can be moved to a position where it does not hinder getting on and off the driver's seat.

Further, according to a third aspect of the present invention, the tilting operation signal is not output from the operation lever to the outside until the lever holder is positioned by the lever holder lock mechanism, and the lever is positioned. In such a case, a signal output means for a lever holder that allows output of a tilt operation signal from the operation lever is provided.

According to such a configuration, it is assumed that the lever is accidentally brought into contact with the operation lever until the lever holder is positioned by the lever holder lock mechanism, that is, while the position adjustment of the operation lever in the left-right direction is performed. Also, it is possible to prevent the tilting operation signal from being output from the operation lever to the outside.

According to a fourth aspect of the present invention, the signal output means for the lever holder is provided when the lever holder is rotated left and right beyond a predetermined range with respect to the armrest. The output of the tilt operation signal is prohibited.

With this configuration, for example, when the lever holder is rotated beyond the predetermined range with respect to the armrest at the time of getting on or off the driver's seat, it is determined that the lever holder accidentally comes into contact with the operation lever. Also, it is possible to prevent the tilt operation signal from being output to the outside from the operation lever.

According to a fifth aspect of the present invention, a base end of the armrest is provided so as to be vertically rotatable with respect to a backrest of the driver's seat, and between the backrest and a base end of the armrest. An armrest lock mechanism for selectively positioning the armrest at a plurality of rotation positions is provided.

According to such a structure, the armrest is rotated vertically with respect to the backrest of the driver's seat, and is positioned at an arbitrary position among a plurality of rotational positions by the armrest lock mechanism. Can also be adjusted in the vertical direction. Further, for example, the armrest can be moved to a position where it does not hinder getting on and off the driver's seat.

Further, according to the present invention, the tilting operation signal is prohibited from being output to the outside from the operation lever until the armrest is positioned by the armrest lock mechanism. The present invention is configured to include a signal output unit for an armrest that allows output of a tilt operation signal from the operation lever.

According to such a configuration, even if the operating lever is inadvertently brought into contact with the operating lever until the armrest is positioned by the armrest locking mechanism, that is, while the vertical position of the operating lever is being adjusted. It is possible to prevent the tilt operation signal from being output from the operation lever to the outside.

Further, according to the invention of claim 7, the signal output means for the armrest is provided when the armrest is turned up and down beyond a predetermined range with respect to the backrest of the driver's seat. The output of the tilt operation signal is prohibited.

With this configuration, when the armrest is rotated beyond a predetermined range with respect to the backrest of the driver's seat, for example, when getting on or off the driver's seat, the operation lever is erroneously moved to the operation lever. Even if the contact is made, it is possible to prevent the tilting operation signal 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 12 show a case where 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. It is formed as a box-shaped cab box surrounded by a rear panel 13, left and right side panels 14, 15 and a ceiling panel 16. The left side panel 14 allows a driver to get into and out of the cab 4. Door 14A (see FIG. 1).

Reference numeral 17 denotes an operator's seat located in the operator's cab 4 and disposed on the floor plate 11. The operator's seat 17 is mounted on the floor plate 11 via a support device 18 and a seat on which an operator sits. 19 and a backrest 2 standing upright behind the seat 19
0, armrests 24 to be described later are provided on both left and right sides of the backrest 20.

21 and 21 are located in front of the driver's seat 17;
1 shows a travel pedal provided on a floor plate 11, and an operation lever 22 is attached to each of the travel pedals 21. When the operator seated on the driver's seat 17 operates the travel pedal 21 or the operation lever 22, the traveling speed of the lower traveling body 1 is controlled according to the operation amount at this time. Further, footrests 23, 23 for the driver to rest their feet are provided on the floor plate 11 on both the left and right sides of each traveling pedal 21, and when the traveling pedal 21 is not operated, the operator can rest on each footrest 23. Leave your feet on

Reference numerals 24, 24 denote armrests provided on the left and right sides of the driver's seat 17, and the armrests 24 are used by an operator sitting on the driver's seat 17 to place elbows or the like when operating the operation levers 47 described later. It is for.

Here, as shown in FIGS. 4 to 6, the armrest 24 is formed in a rectangular parallelepiped shape as a whole, and a rod fitting hole 25 extending in the left-right direction is formed on the side surface on the base end side.
Are drilled. A support plate 26 for supporting a later-described lever holder 35 is protrudingly provided on the distal end side of the armrest 24, and a mounting rod 27 is provided upright at the center of the support plate 26.

The backrest 2 constituting the driver's seat 17
The armrest 24 is slidably fitted in a rod fitting hole 25 on the lower side surface of the armrest 24 so that the armrest 24 is supported by the backrest 20 around the mounting rod 28.
Is mounted so as to be rotatable in the vertical direction with respect to. The rod fitting hole 25 of the armrest 24 and the backrest 2
A retaining mechanism (not shown) for preventing the armrest 24 from being pulled out in the axial direction of the mounting rod 28 is provided between the mounting rod 28 and the mounting rod 28.

Reference numeral 29 denotes an armrest lock mechanism provided between the backrest 20 and the base end side of the armrest 24.
A plurality of positioning holes 30 formed in the side surface of the armrest 24 and a plurality of rotation holes are provided on the base end side of the armrest 24 to engage the armrest 24 with the backrest 20 by engaging with any one of the positioning holes 30. A lock pin 31 which is selectively positioned at a position is roughly constituted by a lock pin 31 described later.

Here, as shown in FIG. 6, each positioning hole 30 is formed on a circumference having a certain radius from the axis center of the mounting rod 28, and is positioned within a predetermined range a, for example. Three of them are the positioning holes 30A for operation, and the four holes drilled beyond the range a are the positioning holes 30B for non-operation. When the lock pin 31 is engaged with any of the positioning holes 30A, the armrest 24 is positioned within a range of an angle θa indicated by a dashed line in FIG. 7, and the tilting operation of the operation lever 47 is performed within this range. It is the operable range that can be performed. on the other hand,
When the lock pin 31 is engaged with any of the positioning holes 30B, the armrest 24 is positioned at a position outside the operable range described above, for example, at a position indicated by a two-dot chain line in FIG. The rotation operation cannot be performed.

Reference numeral 31 denotes a lock pin provided on the side surface of the armrest 24 facing the side surface of the backrest 20 so as to be able to move forward and backward. The lock pin 31 is provided inside the armrest 24 so as to be movable in the left-right direction. The arm spring 24 is always urged by a compression spring 33 in a direction to protrude from the side surface of the armrest 24. The other end of the connecting arm 32 extends into a notch 24A formed on the upper surface of the armrest 24, and
4 is connected to a lock release lever 34 disposed on the upper surface of the lock 4 (see FIG. 5).

The lock pin 31 is normally moved from the side of the armrest 24 by the compression spring 33 to the backrest 2.
0, and engages with any of the positioning holes 30 provided in the backrest 20 to thereby provide the armrest 2.
4 is positioned at an arbitrary rotation position. When the lock release lever 34 is moved in the direction of arrow A, the lock pin 3
The armrest 24 moves toward the armrest 24 against the compression spring 33 and separates from the positioning hole 30, so that the armrest 24 can be rotationally displaced with respect to the backrest 20 around the mounting rod 28.

Reference numerals 35, 35 denote lever holders which are attached to the distal ends of the respective armrests 24 so as to be rotatable in the left-right direction. The lever holders 35 are formed in a substantially rectangular parallelepiped shape as a whole as shown in FIG. An operation lever 47 is tiltably provided on the distal end side, and a rod fitting hole 36 is formed on the proximal end side. And the lever holder 35 is
Mounting rod 27 erected on the tip side of armrest 24
The armrest 24 is mounted so as to be rotatable in the left-right direction around the mounting rod 27 by fitting the rod fitting hole 36 in a slidable manner. In addition,
Mounting rod 27 of armrest 24 and lever holder 35
A retaining mechanism (not shown) for preventing the lever holder 35 from being pulled out in the axial direction of the mounting rod 27 is provided between the rod holder 36 and the rod fitting hole 36.

Reference numeral 37 denotes a lever holder lock mechanism provided between the support plate 26 of the armrest 24 and the lever holder 35. The lever holder lock mechanism 37 has a plurality of positioning holes formed on the upper surface of the support plate 26. A lock pin 39 described later provided in the hole 38 and the lever holder 35 to selectively position the lever holder 35 at a plurality of rotation positions with respect to the armrest 24 by engaging with one of the positioning holes 38. It is roughly composed of

Here, as shown in FIG. 10, each positioning hole 38 is formed on a circumference having a certain radius from the axis center of the mounting rod 27, and for example, is positioned within a predetermined range b. Five of the holes are the positioning holes 38A for operation, and four holes drilled beyond the range b are the positioning holes 38B for non-operation. When the lock pin 39 is engaged with any of the positioning holes 38A, each lever holder 35 is positioned within a range of an angle θb indicated by a dashed line in FIG. It is the operable range where the operation can be performed.
On the other hand, when the lock pin 39 is engaged with any of the positioning holes 38B, the lever holder 35 is positioned at a position other than the operable range described above, for example, at a position indicated by a two-dot chain line in FIG. The tilting operation of 47 cannot be performed.

Reference numeral 39 denotes a lock pin provided on the lower surface of the lever holder 35 facing the support plate 26 of the armrest 24 so as to be able to advance and retreat. The lock pin 39 is provided inside the lever holder 35 as shown in FIG. It is projected downward from the lower end of a connecting arm 40 movably provided in the vertical direction, and is constantly urged by a compression spring 41 in a direction to project from the lower surface of the lever holder 35. Here, the upper end side of the connecting arm 40 is pin-connected to the outer peripheral side of a rotating plate 43 rotatably disposed around the shaft 42 in the lever holder 35, and the rotating plate 43 rotates in the direction of arrow B. Thereby, the connecting arm 40 moves upward against the compression spring 41.

Reference numeral 44 denotes a gear mounted on the rotary plate 43. The gear 44 meshes with a rack 45A formed at the lower end of a connecting arm 45 provided in the lever holder 35 so as to be movable in the left-right direction. doing. Here, the upper end side of the connection arm 45 extends into a notch 35A formed on the upper surface of the lever holder 35, and is connected to a lock release lever 46 provided on the upper surface of the lever holder 35.

The lock pin 39 normally projects downward from the lower surface of the lever holder 35 by the compression spring 41, and engages with one of the positioning holes 38 provided in the support plate 26 of the armrest 24, whereby the lever 39 The holder 35 is positioned at an arbitrary rotation position. When the lock release lever 46 is moved in the direction of arrow C, the rotating plate 43 rotates in the direction of arrow B due to the engagement between the rack 45A of the connecting arm 45 and the gear 44. As a result, the lock pin 39 moves upward against the compression spring 41 and separates from the positioning hole 38 so that the lever holder 35 can be rotationally displaced with respect to the armrest 24.

Reference numerals 47, 47 denote operation levers which are tiltably attached to the distal ends of the respective lever holders 35, and one of the operation levers 47 has an arrow Kx1 as shown in FIG. , Kx2 (left and right directions) to control the bucket 10, and tilt in the directions Ky1 and Ky2 (forward and rearward) to control the boom 8. In addition, the other operation lever 47 is indicated by arrows Kx1, K2.
The arm 9 is tilted in the x2 direction (left and right directions).
To control the turning operation of the upper turning body 2 by tilting in the directions indicated by arrows Ky1 and Ky2 (forward and rearward).

Each operation lever 47 is provided with a displacement sensor (not shown) such as a potentiometer for detecting the tilt angle in each of the four directions indicated by arrows Kx1, Kx2, Ky1, and Ky2. I have. A drive power supply 48 is connected to each displacement sensor, and outputs a tilt operation signal corresponding to the tilt angle of each operation lever 47 to the outside via cables 49, 49,. Each cable 49 is connected to, for example, a controller (not shown) for switching and controlling a bucket control valve, a boom control valve, an arm control valve, and a swing motor control valve. Pressure oil from a hydraulic pump (not shown) is supplied and discharged to a bucket cylinder, a boom cylinder, an arm cylinder, a swing motor, and the like based on an operation signal.

Reference numeral 50 denotes an armrest signal output device for controlling the output of a tilt operation signal from each operation lever 47 in accordance with the operation of the armrest lock mechanism 29, and 51 denotes a signal output device in accordance with the operation of the lever holder lock mechanism 37. A signal output device for a lever holder for controlling the output of the tilt operation signal from each operation lever 47 is shown.
Reference numerals 0 and 51 are arranged in series between the displacement sensor of each operation lever 47 and the drive power supply 48.

Here, the signal output device 5 for the armrest
0 indicates three switches 50A, 50B,
50C, each of these switches 50A-5
0C is, for example, a positioning hole 30 for operation among the positioning holes 30 constituting the armrest lock mechanism 29.
A is arranged one by one in A. When the lock pin 31 is engaged with any of the positioning holes 30A, that is, when the armrest 24 is positioned within the operable range indicated by the dashed line in FIG.
One of the OCs is selectively closed.

On the other hand, a signal output device 51 for the lever holder
Are five switches 51A, 51B, 5 connected in parallel.
Each of the switches 51A to 51E is disposed, for example, in a positioning hole 38A for operation among the positioning holes 38 constituting the lever holder lock mechanism 37. You. When the lock pin 39 is engaged with one of the positioning holes 38A, that is, when the lever holder 35 is positioned within the operation range indicated by the dashed line in FIG. 11, one of the switches 51A to 51E is set. Are selectively closed.

Accordingly, the vertical position adjustment of the armrest 24 is completed, the armrest 24 is positioned within the operable range indicated by the dashed line in FIG. 7, and the horizontal position adjustment of the lever holder 35 is completed. When the lever holder 35 is positioned within the operable range indicated by the dashed line in FIG. 11, a tilt operation signal corresponding to the tilt operation of the operation lever 47 is output to an external controller or the like.

That is, while the position of at least one of the armrest 24 and the lever holder 35 is being adjusted, or when one of the armrest 24 and the lever holder 35 is positioned outside the operable range, the operation is stopped. The output of the tilt operation signal from the lever 47 is prohibited.

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 adjusting the position of the operation lever 47 in the up-down direction, the operator pushes the lock release lever 34 provided on the upper surface of the armrest 24 in the direction of arrow A to release the lock pin 31. The armrest 24 is turned up and down by being detached from the positioning hole 30. Then, in a state where the armrest 24 is rotated within the operable range shown by the dashed line in FIG.
Is released, the lock pin 31 is engaged with one of the positioning holes 30A for operation, and each armrest 24 is positioned at an operation position desired by the operator, thereby adjusting the position of the operation lever 47 in the vertical direction. Can be.

In order to adjust the position of the operation lever 47 in the left and right direction, the operator presses the lock release lever 46 provided on the upper surface of the lever holder 35 in the direction of arrow C to position the lock pin 39. Each lever holder 35 is rotated in the left-right direction by being separated from the hole 38. Then, in a state where each lever holder 35 is rotated within the operable range shown by the dashed line in FIG. 11, the lock release lever 46 is released and the lock pin 39 is engaged with one of the operation positioning holes 38A. By positioning each lever holder 35 at the operation position desired by the operator, the operation lever 4
7 can be adjusted in the left-right direction.

When the armrest 24 is positioned within the operable range by the armrest lock mechanism 29, the switch 50 constituting the signal output device 50
One of A to 50C is closed by the lock pin 31. In a state where the lever holder 35 is positioned within the operable range by the lever holder lock mechanism 37, the switches 51A to 51A constituting the signal output device 51 are arranged.
One of 1E is closed by lock pin 39. As a result, the tilt operation signal from the operation lever 47 is output to an external controller or the like, and the operator seated in the driver's seat 17 operates each of the operation levers 47 to reduce the operation amount at this time. Accordingly, the swing operation of the upper swing body 2, the boom 8, the arm 9, and the bucket 1 of the working device 7 are performed.
0 is controlled, and excavation work such as earth and sand is performed.

Thus, by positioning the armrest 24 with respect to the backrest 20 in the vertical direction and the lever holder 35 with respect to the armrest 24 in the horizontal direction, the operator seated on the driver's seat 17 can easily operate. An operation lever 47 can be arranged. Thus, the operation lever 47 can be tilted at a position suitable for the physique or the like of the worker, and fatigue during excavation work or the like can be reduced, and workability can be improved.

Moreover, in this embodiment, each operating lever 47
Armrest 2 between the displacement sensor of the
Signal output devices 50 and 51 are provided to allow the operation lever 47 to output a tilt operation signal when the lever 4 and the lever holder 35 are respectively positioned within the operable range. Thereby, until the armrest 24 or the lever holder 35 is positioned, that is, the operation lever 4
While the position of the operation lever 7 is being adjusted, the output of the tilt operation signal from the operation lever 47 is prohibited, and during the position adjustment of the operation lever 47, the tilt operation signal is erroneously output to the outside. And the like can be reliably prevented from being carelessly operated.

Next, for example, when the operator moves the armrest 24 when getting on or off the driver's seat 17, the operator presses the lock release lever 34 provided on the upper surface of the armrest 24 in the direction of arrow A. Thereby, the lock pin 31 is disengaged from the positioning hole 30A, and the armrest 24 is rotated, for example, to a position indicated by a two-dot chain line in FIG. In this state, by releasing the lock release lever 34 and engaging the lock pin 31 with any of the positioning holes 30B, the armrest 24 can be positioned outside the operable range.

In order to move the lever holder 35, the operator pushes the lock release lever 46 provided on the upper surface of the lever holder 35 in the direction of arrow C, thereby moving the lock pin 39 from the positioning hole 38A. Let go,
The lever holder 35 is rotated, for example, to a position indicated by a two-dot chain line in FIG. In this state, the lock release lever 4
The lever holder 35 can be positioned outside the operable range by releasing the 6 and engaging the lock pin 39 with any of the positioning holes 38B.

Therefore, when the operator gets on and off the driver's seat 17 or performs an inspection work or the like in the cab 4,
Armrest 24, lever holder 35, operation lever 47
And the like can be positioned at a position where they do not obstruct, so that movement or inspection work in the cab 4 can be performed smoothly.

Further, when the armrest 24 is positioned outside the operable range, all the switches 50A to 50C constituting the signal output device 50 are kept open, and the lever holder 35 is out of the operable range. In the positioned state, all the switches 51A to 51E constituting the signal output device 51 are kept open. Therefore, when at least one of the armrest 24 and the lever holder 35 is positioned outside the operable range, the output of the tilt operation signal from the operation lever 47 is prohibited.

Thus, even if the operator accidentally comes into contact with the operation lever 47 when the operator gets on or off the driver's seat 17 or performs inspection work or the like in the driver's cab 4, the operation lever 47 is It is possible to reliably prevent the tilting 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, the lever holder 35 provided with the operation lever 47 is
Since the lever holder 35 is selectively positioned at a plurality of rotation positions by the lever holder lock mechanism 37, the lever holder 35 can be rotated left and right. Thereby, the position of each operation lever 47 in the left-right direction can be adjusted according to the shoulder width of the operator. Accordingly, each operation lever 47 can be tilted at a position suitable for the physique of the worker, and thus fatigue of the worker can be reduced and workability can be improved.

The armrest 24 is mounted on the side of the backrest 20 constituting the driver's seat 17 so as to be vertically rotatable, and the armrest lock mechanism 29 selectively positions the armrest 24 at a plurality of rotation positions. Therefore, the vertical position of each operation lever 47 can be adjusted, and the operability of the operation lever 47 can be further improved.

Further, when the operator gets on and off the driver's seat 17 or performs an inspection work or the like in the cab 4,
The armrest 24 and the lever holder 35 can be moved out of the way, so that movement or inspection work in the cab 4 can be performed smoothly.

Further, when the armrest 24 and the lever holder 35 are positioned within the operable range, the tilting operation signal from each of the operation levers 47 is allowed to be output to the outside. Signal output devices 50 and 51 are provided to prohibit the tilting operation signal from being output to the outside. Thereby, the armrest 2
4 or until the lever holder 35 is positioned
Alternatively, when at least one of the armrest 24 and the lever holder 35 is positioned out of the operable range, even if the worker accidentally contacts the operation lever 47, the tilt operation is performed from the operation lever 47 at this time. It is possible to reliably prevent a signal from being output to the outside and inadvertent operation of the working device 7 and the like.

In the above embodiment, three positioning holes 30A for positioning the armrest 24 within the operable range are provided in each of the positioning holes 30 constituting the armrest lock mechanism 29. However, the present invention is not limited to this. For example, the armrest 24 may be positioned within the operable range using two or less or four or more positioning holes 30A.

Also, in the above-described embodiment, five positioning holes 38A for positioning the lever holder 35 within the operable range are provided in each of the positioning holes 38 constituting the lever holder locking mechanism 37. The present invention is not limited to this, and the lever holder 35 may be positioned within the operable range using, for example, four or less or six or more positioning holes 38A.

Further, in the above-described embodiment, the operation lever device for operating the working device of the hydraulic shovel 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.

[0067]

As described in detail above, according to the first aspect of the present invention, the lever holder provided with the operation lever is configured to be rotatable left and right with respect to the armrest. By adjusting the position of the operation lever in the left-right direction, the operation lever can be arranged at a position suitable for the shoulder width of the worker. Accordingly, each operation lever can be tilted at a position where the operator can easily operate, and thus fatigue of the operator can be reduced and workability can be improved.

According to the second aspect of the present invention, the lever holder locking mechanism for selectively positioning the lever holder at a plurality of rotation positions in front of the armrest is provided between the armrest and the lever holder. By positioning the lever holder at an arbitrary position among a plurality of rotation positions by the holder lock mechanism, the operation lever can be arranged at a position suitable for the width of a worker's shoulder and the like, and the operation lever can be stably tilted. Operations can be performed. In addition, for example, the operation lever can be moved to a position that does not interfere with the getting on / off of the driver's seat or the inspection work in the cab, so that the getting on / off to the driver's seat, the inspection work in the cab can be performed quickly. it can.

Further, according to the third aspect of the present invention, the output of the tilting operation signal from the operating lever to the outside is prohibited until the lever holder is positioned by the lever holder lock mechanism, and the lever is positioned. Signal output means for the lever holder that permits the output of the tilting operation signal when the tilting operation signal is output. Thus, even if the lever is locked by the lever holder locking mechanism, that is, while the lever is inadvertently in contact with the lever while the lever is being adjusted in the left-right direction, the lever is tilted outward from the lever. It is possible to prevent the output of the rotation operation signal, and it is possible to reliably prevent the working device and the like from being carelessly operated.

According to the fourth aspect of the present invention, the signal output means for the lever holder tilts when the lever holder is rotated left and right with respect to the armrest beyond a predetermined range. Since the output of the operation signal is prohibited, for example, when the lever holder is positioned at a position beyond the operable range when getting on or off the driver's seat, even if the lever is accidentally touched, It is possible to prevent the tilt operation signal from being output to the outside from the lever.

According to the fifth aspect of the present invention, the base end of the armrest is provided so as to be vertically rotatable with respect to the backrest of the driver's seat, and a plurality of armrests are provided between the backrest and the armrest. Since the armrest lock mechanism that selectively positions the operation lever is provided, the armrest is rotated vertically with respect to the backrest of the driver's seat, and is positioned at an arbitrary position by the armrest lock mechanism. Can also be adjusted. Further, for example, the armrest can be moved to a position where it does not hinder getting on and off the driver's seat.

Further, according to the invention of claim 6, until the armrest is positioned by the armrest lock mechanism, the output of the tilting operation signal from the operation lever to the outside is prohibited, and when the armrest is positioned. Since the armrest signal output means for allowing the output of the tilting operation signal is provided, until the armrest is positioned by the armrest lock mechanism, that is, while the vertical adjustment of the operation lever is performed. Therefore, even if the operation lever accidentally contacts the operation lever, it is possible to prevent the tilt operation signal from being output from the operation lever to the outside, and it is possible to reliably prevent the working device or the like from being carelessly operated.

Further, according to the invention of claim 7, the signal output means for the armrest is provided when the armrest is turned up and down beyond a predetermined range with respect to the backrest of the driver's seat. Since the output of the tilting operation signal is prohibited, for example, when the armrest is positioned at a position beyond the operable range at the time of getting on or off the driver's seat, even if it accidentally touches the operation lever,
It is possible to prevent the tilt operation signal from being output to the outside from the operation lever.

[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 plan view showing the cab as viewed from the direction of arrows II-II in FIG. 1;

FIG. 3 is a side view showing the cab as viewed from a direction indicated by arrows III-III in FIG. 2;

FIG. 4 is an exploded perspective view showing a driver's seat, an armrest and the like in an enlarged manner.

FIG. 5 is a longitudinal sectional view showing an armrest, an armrest lock mechanism, and the like, as viewed from a direction indicated by arrows VV in FIG. 2;

6 is a cross-sectional view showing a positioning hole of the armrest lock mechanism as viewed from a direction indicated by arrows VI-VI in FIG. 5;

FIG. 7 is a side view showing a state in which the armrest is rotated and displaced.

FIG. 8 is an exploded perspective view showing an armrest, a lever holder and the like in an enlarged manner.

FIG. 9 is a longitudinal sectional view showing a lever holder, an armrest lock mechanism, and the like, as viewed from a direction indicated by arrows IX-IX in FIG. 2;

FIG. 10 is a sectional view showing a positioning hole of the lever holder lock mechanism as viewed from the direction of arrows XX in FIG. 9;

FIG. 11 is a plan view showing a state in which the lever holder is rotationally displaced.

FIG. 12 is a circuit diagram showing an operation lever, a driving power supply, a signal output device, and the like.

[Explanation of symbols]

 4 Operator's Cab 17 Driver's Seat 24 Armrest 29 Armrest Lock Mechanism 30 Positioning Hole 31 Lock Pin 35 Lever Holder 37 Lever Holder Locking Mechanism 38 Positioning Hole 39 Lock Pin 50 Signal Output Device for Lever Holder 51 Signal Output Device for Arm Rest

Claims (7)

[Claims] An armrest located in a cab of a construction machine and disposed on at least one side in a left-right direction of a driver's seat, a base end attached to the armrest, and a distal end provided with an armrest centered on the base end. An operation lever device for a construction machine, comprising: a lever holder that is rotated in the left-right direction with respect to the lever; and an operation lever provided on the lever holder and operated on the lever holder. 2. A lever holder locking mechanism for selectively positioning the lever holder at a plurality of rotation positions in front of the armrest is provided between the armrest and a base end side of the lever holder. An operation lever device for a construction machine according to item 1. 3. An output of a tilt operation signal from the operation lever to the outside is prohibited until the lever holder is positioned by the lever holder lock mechanism. The operation lever device for a construction machine according to claim 2, further comprising a signal output unit for a lever holder that permits output of a tilt operation signal. 4. The signal output means for the lever holder,
4. A structure in which output of the tilt operation signal is prohibited when the lever holder is rotated left and right with respect to the armrest beyond a predetermined range.
An operation lever device for a construction machine according to item 1. 5. A base end side of the armrest is provided so as to be vertically rotatable with respect to a backrest of the driver's seat, and a plurality of pivots are provided between the backrest and the base end side of the armrest. 5. The operating lever device for a construction machine according to claim 1, further comprising an armrest lock mechanism for selectively positioning the armrest at a position. 6. An output of a tilt operation signal from the operation lever to the outside is inhibited until the armrest is positioned by the armrest lock mechanism, and when the armrest is positioned, the tilt from the operation lever is tilted. The operation lever device for a construction machine according to claim 5, further comprising a signal output unit for an armrest that permits output of an operation signal. 7. The signal output means for the armrest,
When the armrest is rotated vertically beyond a predetermined range with respect to the backrest of the driver's seat,
The operation lever device for a construction machine according to claim 6, wherein output of the tilt operation signal is prohibited.