JP2002356877A - Operation lever device for construction machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the operability or the like by adjusting the heights of an operation lever and an arm rest in response to operator's physical constitution, liking or the like. SOLUTION: An operation lever 17 and an arm rest 18 are arranged at the upper stand portion 14 of a lever stand 12. Also, a lever support body 15 is provided for the operation lever 17, this lever support body 15 and the arm rest 18 are connected together by a coupling plate 19. Also, a height adjusting mechanism 22 equipped with ball screws 27 and 28 or the like is provided between the lever support body 15 and the arm rest 18. And the coupling plate 19 is moved in up and down direction by the height adjusting mechanism 22 and the height adjustment for both the operation lever 17 and the arm rest 18 can be performed at the same time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction machine such as a hydraulic shovel, and more particularly to an operation lever device for a construction machine equipped with an armrest.

[0002]

2. Description of the Related Art Generally, construction machines such as hydraulic excavators are
The vehicle includes a traveling body, and a revolving body rotatably provided on the traveling body. A working device for excavating earth and sand is provided on the front side of the revolving body so as to be able to move up and down. Further, a cab as an operator's cab is provided on the frame of the revolving superstructure.

A cab of a hydraulic excavator of this type according to the prior art is provided with a cab box provided on a frame of a revolving body and defining an operation cab therein, an operator seat provided on a floor plate of the cab box, An operation lever device that is disposed on both the left and right sides of the driver's seat and to which an operation lever for operating the working device is attached.

In a conventional hydraulic excavator, armrests are disposed on both the left and right sides of a driver's seat. At the time of tilting operation of the operation lever, the operator sits on the driver's seat and places his arm (elbow) on the armrest and performs the operation in this state, thereby reducing the burden on the arm and improving operability. Configuration (for example,
JP-A-6-35356, etc.).

[0005]

By the way, in the above-mentioned prior art, the height position of the armrest can be adjusted using bolts and pins according to the physique and preference of the operator. However, changing the height of the armrest changes the relative position between the armrest and the operation lever. Further, the height position of the armrest can be adjusted stepwise only in three stages, and it is difficult for the operator to necessarily adjust the height position of the armrest optimally.

For this reason, when the operator sits on the driver's seat and places his arm on the armrest, the height position of the operation lever is too high or too low, and the operability of the operation lever can be improved. Therefore, there is a problem that the user tends to be tired at the time of operation.

The present invention has been made in view of the above-mentioned problems of the prior art, and the present invention can appropriately adjust the mounting positions of the operation lever and the armrest according to the physique and preference of the operator. An object of the present invention is to provide an operation lever device of a construction machine capable of improving operability and the like.

[0008]

In order to solve the above-mentioned problems, an operation lever device for a construction machine according to the present invention is arranged on at least one of the left and right sides of a driver's seat provided on the construction machine. A lever stand, an operation lever disposed in front of the lever stand and tilted by an operator seated in the driver's seat, and an operation lever positioned behind the operation lever and disposed on the lever stand and seated in the driver's seat Arm rest for an operator to put his arm on.

A feature of the structure adopted in the first aspect of the invention is that the operation lever and the armrest are moved together in the upward and downward directions.

With this configuration, the operating lever and the armrest can be moved upward and downward together, and the height adjustment of the operating lever and the armrest can be performed simultaneously.

Further, the invention according to claim 2 is configured such that the operating lever and the armrest are integrally connected to each other in the lever stand. With this configuration, the operation lever and the armrest can be integrally moved upward and downward with respect to the lever stand.

The invention according to claim 3 is configured such that the lever stand is provided with a height adjusting mechanism for adjusting the height of the operation lever and the height of the armrest. With this configuration, the height adjustment of the operation lever and the height adjustment of the armrest can be easily performed using the height adjustment mechanism.

Further, in the invention according to a fourth aspect, the height adjusting mechanism is provided with a regulating means for regulating the upward and downward movement of the operation lever and the upward and downward movement of the armrest. With such a configuration, the operation lever and the armrest can be positioned upward and downward by using the restricting means, and it is possible to prevent the operation lever and the armrest from being carelessly moved.

According to a fifth aspect of the present invention, in the height adjusting mechanism, the operation lever and the armrest are moved upward by using a ball screw.
It is configured to move downward in a stepless manner. With such a configuration, the height adjustment of the operation lever and the height adjustment of the armrest can be performed simultaneously steplessly.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a construction machine according to an embodiment of the present invention; FIG.

FIGS. 1 to 8 show a first embodiment of the present invention, in which 1 is a traveling body of a hydraulic shovel, and 2 is mounted on the traveling body 1 so as to be able to turn, together with the traveling body 1. As shown in FIGS. 1 and 2, the revolving body 2 includes a revolving frame 3, a counterweight 4 mounted on a rear end of the revolving frame 3, and a counterweight 4. An engine cover 5 provided on the front side and covering an engine (not shown) mounted on the turning frame 3 and the like;
The cab 6 has a floor plate 6A and the like, which is disposed on the front left side of the revolving frame 3. The turning frame 3 is provided with a hydraulic actuator such as a turning motor (not shown), and the turning body 2 is driven to turn by the turning motor.

Reference numeral 7 denotes a working device which is provided at the front of the revolving unit 2 so as to be able to move up and down. And a bucket 7C pin-coupled to the distal end of the arm 7B. The boom 7A, the arm 7B, and the bucket 7C are connected to a boom cylinder 7D, an arm cylinder 7
It is rotated by an actuator such as E and the bucket cylinder 7F.

Reference numeral 8 denotes a driver's seat arranged on a floor plate 6A of the cab 6, and the driver's seat 8 is a seat 8 on which an operator sits.
A and a backrest 8B provided at the rear of the seat 8A.

The cab 6 is located on the left side of the driver's seat 8.
The operation lever device 11 includes a lever stand 12 described later,
The operation lever 17, the armrest 18, and the height adjustment mechanism 22 are roughly configured.

Reference numeral 12 denotes a lever stand which forms an outer shell of the operation lever device 11. The lever stand 12 includes a lower stand 13 and an upper stand 14 provided on the lower stand 13. ing. Also,
The lower stand portion 13 includes a bottom plate 13A, a front plate 13B, a rear plate 13C, left and right side plates 13D (only one is shown), and an upper plate 13E. Further, the upper stand portion 14 includes a front plate 14A, a rear plate 14B, and left and right side plates 1.
4C (only one is shown) and an upper plate 14D.

The front plate 14A of the upper stand 14
A lever support insertion hole 14E into which a later-described lever support 15 is inserted is provided at a corner of the upper plate 14D and the upper plate 14D.
Also, the upper plate 14D of the upper stand portion 14 has
A guide plate insertion hole 14F into which a guide plate 24 to be described later is inserted later and an armrest insertion hole 14G into which the armrest 18 is inserted are formed.

Reference numeral 15 denotes a lever support which is inserted into the upper stand portion 14 of the lever stand 12 through the support insertion hole 14E, and has a box structure. An output device 16 is provided. The lever support 15 tiltably supports an operation lever 17 described later via a signal output device 16.

Here, the signal output device 16 has a displacement sensor (not shown) such as a potentiometer for detecting the tilt angle of the operating lever 17 in four directions through four pushers 16A (only three are shown). ) Are arranged. For this reason, a tilt control signal from a displacement sensor corresponding to the tilt angle of the operation lever 17 is input to, for example, a controller (neither is shown) for switching and controlling the bucket control valve and the boom control valve. By switching the control valves in accordance with the tilt control signal, pressure oil from a hydraulic pump (not shown) is supplied to and discharged from the bucket cylinder 7F and the boom cylinder 7D.

Reference numeral 17 denotes an operation lever disposed on the front side of the lever stand 12. The operation lever 17 is mounted above the lever support 15 via a signal output device 16. Here, the operation lever 17 includes an operation shaft 17A whose base end is attached to the signal output device 16, and an operation shaft 17A.
A and a grip 17B attached to the distal end side of A. Then, the operator tilts the operation lever 17 by sitting on the driver's seat 8 and gripping the grip 17B.

Reference numeral 18 denotes an armrest located on the lever stand 12 at the rear side of the operation lever 17, and the armrest 18 is inserted into the upper stand portion 14 upward and downward through an armrest insertion hole 14G. Pillar 1
8A and an armrest 18B integrally provided on the upper end side of the column 18A. At the time of tilting operation of the operation lever 17, the operator moves the armrest 18.
The operation is performed in a state where the elbow part of the arm and the like are placed on the armrest 18B.

Reference numeral 19 denotes a lever support 15 and an armrest 1
8 is a connecting plate as a connecting member integrally connected in the lever stand 12, and the connecting plate 19 is a substantially rectangular plate-like body extending forward and backward in the upper stand portion 14 of the lever stand 12. Is formed. And the connecting plate 1
Reference numeral 9 denotes a front end attached to the lever support 15 via bolts 20 and the like, and a rear end attached to the column 18A of the armrest 18 via bolts 21 and the like.

Reference numeral 22 denotes the lever support 15 and the armrest 1
8, a height adjusting mechanism provided on the lower stand portion 13 of the lever stand 12. The height adjusting mechanism 22 has a lower end on the lower stand portion 13 via a bolt 23 or the like. A guide plate 24 fixed to the plate 13E, guide rails 25, 25 provided on the guide plate 24 along the upper and lower directions, and fitted on the respective guide rails 25 to move up and down along the guide rails 25; A table 26 made of a rectangular flat plate guided downward, an upper ball screw 27 provided on the guide plate 24 side, and a table 26
A lower ball screw 28, 28 provided on the side and a male screw screwed to each of these ball screws 27, 28 in the longitudinal direction of the outer peripheral surface are provided.
It is roughly constituted by a screw shaft 29 movably supported in a downward direction and a rotation restricting mechanism 32 described later.

A knob 30 is provided on the upper end side of the screw shaft 29.
A handle 30 having an A is provided integrally. A substantially intermediate portion in the longitudinal direction before and after the connecting plate 19 is integrally attached to the table 26 with bolts 31 or the like.

For this reason, when operating the height adjusting mechanism 22, the operator rotates the handle 30 via the knob 30A, and the screw shaft 29
The table 26 moves along with the connecting plate 19 along the guide rail 25 while being screwed with 7, 7, and accordingly, the operating lever 17 and the armrest 18 move up and down together.

Reference numeral 32 denotes a rotation restricting mechanism as a restricting means provided between the guide plate 24 and the screw shaft 29. The rotation restricting mechanism 32 has a male screw 33A as shown in FIG. One end side is constituted by a screw member 33 fixedly provided to the guide plate 24 and a fastening nut 34 screwed into the external thread portion 33A of the screw member 33. Further, a through hole 33B is formed in the screw member 33 in an upward and downward direction, and the screw shaft 29 is inserted into the through hole 33B.

Therefore, when the fastening nut 34 is tightened to the screw shaft 29, the screw shaft 29 is pressed into the through hole 33B of the screw member 33, and the rotation of the screw shaft 29 is regulated with respect to the through hole 33B. Further, when the fastening nut 34 is loosened, the screw shaft 29 is placed in a rotatable state with respect to the through hole 33B of the screw member 33.

Reference numeral 35 denotes a dustproof cover on the operation lever 17 side, and reference numeral 36 denotes a dustproof cover on the armrest 18 side.

Reference numeral 41 denotes a right operating lever device as shown in FIG. 3. The operating lever device 41 has a shape which is symmetrical to the left operating lever device 11 in the left and right directions. The shape of the member does not change significantly. Therefore, the reference numerals indicating the members constituting the right operation lever device 41 are described by adding “′” to the reference numerals used to describe the left operation lever device 11.

The right operating lever device 41 has substantially the same configuration as the left operating lever device 11, and a description thereof will be omitted.

By operating the operating lever 17 ', the operating lever device 41 operates, for example, the arm cylinder 7E to operate the arm 7B, or controls the swing motor to cause the swing body 2 to swing. This is different from the operation lever device 11 in this point.

The hydraulic shovel according to the present embodiment has the above-described configuration. Next, the operation of the hydraulic shovel will be described.

First, when performing an excavation operation or the like, the operator sitting in the driver's seat 8 needs to use the armrests 18, 18 '.
And the left and right operation levers 17 and 17 'are tilted, whereby a tilt control signal corresponding to the tilt angles of the operation levers 17 and 17' is transmitted from the signal output device 16 or the like to the bucket control. It is output to a valve or the like to control the operation of the working device 7 or the like to perform excavation of earth and sand.

When the operator is seated in the driver's seat 8, the height of the operating lever 17 and the height of the armrest 18 may be too high or too low, respectively, due to differences in the physique and preferences of the operator. May be.

Therefore, in the operating lever device 11 used in the present embodiment, the lever support 15 and the armrest 18 are integrally connected via a connecting plate 19, and this connecting plate 19 is moved up and down by a height adjusting mechanism 22. The screw shaft 29 is held so as to be movable downward, and the rotation of the screw shaft 29 is restricted by a rotation restriction mechanism 32.

Therefore, when adjusting the height position of the operation lever 17 and the height position of the armrest 18, first,
The screw shaft 29 is rotated by loosening the fastening nut 34 of the rotation restricting mechanism 32 and then rotating the handle 30 via the knob 30A, thereby moving the table 26 to the guide rail 25.
Move up and down along.

As a result, the operation lever 17 and the armrest 18 can be moved upward and downward integrally with the connecting plate 19, and the height position of the operation lever 17 and the height position of the armrest 18 are adjusted steplessly together. be able to.

Thus, in the present embodiment, the operating lever 17 and the armrest 18 can be simultaneously arranged at positions suitable for the physique and the like of the operator.
The operation lever 17 can be smoothly operated with the elbow resting on 8, and the workability and the like can be improved by reducing the fatigue of the operator.

The screw shaft 2 is rotated by using the rotation restricting mechanism 32.
9, the table 26 can be positioned up and down with respect to the guide plate 24 and can be fixed. The operator places the elbow on the armrest 18 and grips the operation lever 17. At times, the operation lever 17,
It is possible to prevent the armrest 18 from moving carelessly.

Further, since the height adjustment of the operation lever 17 and the height adjustment of the armrest 18 are continuously performed by the height adjustment mechanism 22 using the ball screws 27 and 28, the height of the operation lever 17 and the armrest are adjusted. Fine adjustment of the height of 18 can be performed, and the operation lever 17 and the armrest 18 can be more reliably arranged at a position suitable for the physique and the like of the operator.

Next, FIG. 9 shows a second embodiment of the present invention, which is characterized in that the screw shaft of the height adjusting mechanism is rotated using an electric motor. It is in. In the present embodiment, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 51 denotes a left operating lever device according to the present embodiment. The operating lever device 51 is roughly constituted by a lever stand 52, a height adjusting mechanism 54, an operating lever 17, and an armrest (all not shown). Have been.

The lever stand 52 includes the lower stand 13 and an upper stand 53 provided on the lower stand 13. Also,
The upper stand 53 has left and right side plates 53A (only one is shown), an upper plate 53B, and the like.

Reference numeral 54 denotes a height adjusting mechanism provided in the lower stand portion 13 of the lever stand 52 for use in the present embodiment. The height adjusting mechanism 54 is the height adjusting mechanism described in the first embodiment. Almost like the mechanism 22, the guide rail 55,
A guide plate 56 having a guide plate 55; a table 57 guided upward and downward along the guide rail 55;
6 is substantially constituted by a screw shaft 58 rotatably supported on the upper end side and an electric motor 59 described later. The guide plate 56 and the table 57 are provided with upper and lower ball screws (not shown) which are screwed with the screw shaft 58.

Reference numeral 59 denotes an electric motor provided on the upper end side of the guide plate 56. The electric motor 59 is connected to a switch 61 by a wiring 60. And switch 6
Reference numeral 1 is provided on the upper stand portion 53 of the lever stand 52, and operates the switch 61 to rotate the screw shaft 58 or stop the rotation. The screw shaft 58
For example, a method using an electromagnetic clutch (not shown) or the like can be considered as a rotation restricting mechanism for restricting the rotation of the motor.

Thus, also in the present embodiment configured as described above, it is possible to obtain substantially the same operation and effect as in the first embodiment. In particular, in the present embodiment, the screw shaft 58 can be automatically rotated using the electric motor 59,
The turning operation of the screw shaft 58 can be easily performed.

In each of the embodiments, a hydraulic excavator has been described as an example of a construction machine. However, the present invention is not limited to this and can be widely applied to other construction machines such as a hydraulic crane.

[0052]

As described above in detail, according to the first aspect of the present invention, the operation lever and the armrest are moved up and down together, so that the height adjustment of the operation lever and the armrest can be performed. Height adjustment can be performed simultaneously. As a result, the operating lever and the armrest can be arranged at positions suitable for the physique and the like of the operator, and the operator can smoothly operate the operating lever with the elbow placed on the armrest, thereby reducing operator fatigue and reducing workability. Can be improved.

According to the second aspect of the present invention, since the operation lever and the armrest are integrally connected to each other in the lever stand, the operation lever and the armrest are integrally moved upward and downward with respect to the lever stand. Can be
The height adjustment of the operation lever and the height adjustment of the armrest can be easily performed.

According to the third aspect of the present invention, since the lever stand is provided with a height adjusting mechanism for adjusting the height of the operating lever and the height of the armrest, the height of the operating lever is adjusted using the height adjusting mechanism. The height adjustment and the height adjustment of the armrest can be performed smoothly, and the workability at the time of height adjustment can be improved.

Further, in the invention according to claim 4, since the upward and downward movement of the operation lever and the upward and downward movement of the armrest are regulated by the regulating means, the operating lever and the armrest are regulated by the regulating means. , The position of the operation lever and the armrest can be prevented from being carelessly moved.

Further, according to the fifth aspect of the present invention, the operation lever and the armrest are moved steplessly upward and downward by using a ball screw. Therefore, the height of the operation lever and the height of the armrest are increased by using the ball screw. Fine adjustment of the height can be performed, and the operation lever and the armrest can be more reliably arranged at a position suitable for the physique and the like of the operator.

[Brief description of the drawings]

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

FIG. 2 is an enlarged perspective view showing the inside of the cab in FIG.

FIG. 3 is an enlarged perspective view showing a driver's seat and an operation lever device in FIG. 2;

FIG. 4 is an enlarged cross-sectional view of the operation lever, the armrest, the height adjustment mechanism, and the like, which are enlarged from the direction of arrows IV-IV in FIG.

5 is a partially enlarged cross-sectional view showing a height adjusting mechanism and the like in FIG. 4 in an enlarged manner.

6 is a sectional view of the height adjusting mechanism and the like as viewed from the direction indicated by arrows VI-VI in FIG. 5;

FIG. 7 is an enlarged sectional view of a main part showing a rotation restricting mechanism and the like in FIG. 6 in an enlarged manner.

FIG. 8 is a perspective view showing a single screw member in FIG. 7;

FIG. 9 is a sectional view of a height adjusting mechanism and the like of an operation lever device according to a second embodiment of the present invention, as viewed from the same position as in FIG.

[Explanation of symbols]

 6 Cab 8 Driver's seat 11, 41, 51 Operating lever device 12, 12 ', 52 Lever stand 15, 15' Lever support 16 Signal output device 17, 17 'Operating lever 18, 18' Armrest 19 Connecting plate 22, 22 ' , 54 Height adjustment mechanism 27, 28 Ball screw 32 Rotation regulation mechanism (regulation means)

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Takeshi Higuchi 650 Kandate-cho, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. F-term in Tsuchiura Plant (reference) 2D003 AA01 EA04 EA05 2D015 EB01 3J070 AA03 AA41 BA25 CE04 DA21 EA01

Claims (5)

[Claims] 1. A lever stand provided on at least one of a left side and a right side of a driver seat provided on a construction machine, and a tilting operation by an operator disposed on a front side of the lever stand and seated on the driver seat. An operation lever device for a construction machine, comprising: an operation lever to be operated; and an arm rest that is disposed on the lever stand located behind the operation lever and on which an operator seated on a driver's seat puts an arm. An operating lever device for a construction machine, wherein the lever and the armrest are moved together in the upward and downward directions. 2. The operation lever device for a construction machine according to claim 1, wherein the operation lever and the armrest are integrally connected to each other in the lever stand. 3. The operating lever device for a construction machine according to claim 1, wherein the lever stand is provided with a height adjusting mechanism for adjusting the height of the operating lever and the height of an armrest. 4. The operation of a construction machine according to claim 3, wherein the height adjustment mechanism includes a regulating unit that regulates upward and downward movement of the operation lever and upward and downward movement of the armrest. Lever device. 5. The operation lever device for a construction machine according to claim 3, wherein the height adjustment mechanism is configured to move the operation lever and the armrest upward and downward steplessly using a ball screw.