JP2003288127A - Operation device for working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a working machine from operating accidentally by touching an operation lever, through carelessness or the like. <P>SOLUTION: This operating device is provided with a lock mechanism 65, which locks an operation lever 27 releasably not to move slidably where the operation device of a working machine performs a first work operation, when the operation lever 27 is operated slidably around a first shaft and performs a second work operation when the operation lever 27 is operated slidably around a second shaft. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating device for a work machine such as a front loader.

[0002]

2. Description of the Related Art For example, in a working machine such as a front loader, a control section near a driver's seat supports an operating lever swingably about a left-right axis (first axis) and a front-rear axis (second axis). When the operating lever is swung in the front-rear direction around the left and right axes, the boom is moved up and down (first work operation), and when the operating lever is swung in the left-right direction around the front-rear axis, There is one that is made to scoop and dump (second work operation).

However, in the conventional operating device for the working machine of this type, a mechanism for locking the operating lever so that it cannot swing is not provided.

[0004]

Therefore, in the past, if the operating lever was inadvertently touched while traveling, the boom could move up and down, the bucket could squeeze and dump, and the work machine could operate unexpectedly. There was a risk of In view of the above problems, the present invention can prevent the working machine from unexpectedly operating even if the operating lever is inadvertently contacted with the operating lever.

[0005]

The technical means of the present invention for solving this technical problem is to operate the operation lever 27 first.
When swinging around the shaft 40, perform the first work motion,
When the operating lever 27 is rocked around the second shaft 35,
In the operating device of the working machine configured to perform the second work operation, a lock mechanism 65 that locks the operation lever 27 so as to be unlocked so as not to swing is provided.

Further, the technical means of the present invention is provided with a first interlocking body 47 which moves in conjunction with the swinging motion of the operating lever 27 around the first shaft 40 in order to perform the first work motion. The second shaft 3 of the operation lever 27 is used to perform the work operation 2
A second interlocking body 56 is provided that moves in association with a swinging movement around five times, and a locking member 66 that engages and disengages the first interlocking body 47 and the second interlocking body 56 so as to be immovable. Is provided in the lock mechanism 65. Further, according to the technical means of the present invention, the locking member 66 is disengaged from the engaging position A1 that engages with the first interlocking body 47 and the second interlocking body 56, and the first interlocking body 47 and the second interlocking body 56. The engagement member 66 is movably held at the engagement release position A2 and the locking member 66 is engaged at the engagement position A1.
And a lock lever 67 for moving to the disengagement position A2.
Is provided.

Further, according to the technical means of the present invention, the lock lever 67 is unlocked by moving the locking member 66 to the engagement position A1 and the locking position B1 by moving the engagement member 66 to the engagement release position A2. A lock lever guide 76 that guides the lock lever 67 to the position B2 is provided to lock the lock lever 67 in the lock position B1.
A positioning mechanism 81 for positioning and holding the lock position B2 and the lock release position B2 is provided. Further, according to the technical means of the present invention, the control valve 21 is provided, and the first spool 51 of the control valve 21 is operated by the movement of the first interlocking body 47 to perform the first work operation via the hydraulic device. However, the second spool 61 of the control valve 21 is operated by the movement of the second interlocking member 56, and the second work operation is performed via the hydraulic device.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 is a tractor (vehicle), and a vehicle body 1a thereof is mainly configured by directly connecting an engine, a flywheel housing, a clutch housing, a transmission case, etc. Have. A front loader (work machine) 4 is attached to the front part of the vehicle body 1a. The front loader 4 includes a pair of left and right masts 6, a boom 7 pivotally supported on the upper end side of each mast 6 so as to be vertically swingable, and a tip end side of the left and right booms 7 so as to be pivotable about a left and right axis. And a bucket (work implement) 8.

A boom cylinder (hydraulic device) 12 for vertically swinging the boom 7 (first working operation) is interposed between each mast 6 and each boom 7, and a bucket 8 is provided.
A bucket cylinder (hydraulic device) 13 for performing a squeeze / dump operation (second operation operation) of the bucket 8 is interposed between the boom cylinder 12 and each boom 7.
The bucket cylinder 13 is composed of a hydraulic cylinder. The lower portions of the left and right masts 6 are removably fitted to the mast mounting bases 14 fixed to the left and right sides of the vehicle body 1a from above, and are fixed to the mast mounting bases 14 by pins 15 and the like.

In order to disengage the front loader 4 from the vehicle body 1a, with the bucket 8 grounded, the pin 1
When the fixing of the mast mount 14 and the mast 6 by means of 5, etc. is released and the boom cylinder 13 is extended, the mast 6 rises and separates from the mast mount 14. The driver's seat is placed between the pair of left and right fenders 16,
A driving control unit 19 including a steering wheel 18 and the like is arranged at the front portion. The front loader 4 performs loading operation and the like by switching the tractor 1 between forward and backward, vertically swinging the boom 7 by expanding and contracting the boom cylinder 12, and performing a squeeze / dump operation of the bucket 8 by expanding and contracting the bucket cylinder 13. A control valve 21 for controlling the bucket cylinder 13 and the bucket cylinder 13 is provided so as to be operable from the driving control unit 19.

As shown in FIG. 2, a valve stay 25 is fixed to the inside of the right (left or right) mast mount 14 on the upper end side in the left-right direction, and the control valve 21 is mounted on the valve stay 25. At the same time, an operation lever 27 is supported by the valve stay 25. The control valve 2 is operated by the operating lever 27.
The boom cylinder 12 and the bucket cylinder 13 are controlled by operating 1. As shown in FIGS. 5 and 6, a block-shaped mounting body 29 is provided at the base end portion of the operating lever 27, and a mounting portion 30 that is recessed downward in a U-shape is provided at the upper end portion of the valve stay 25. The
A cylindrical support cylinder 31 is fixed to the mounting portion 30.
A support shaft 32 is fitted in the support cylinder 31, and is supported by a bolt 33 that is screwed into the support shaft 32 so as to be rotatable around a second shaft 35 that is a bolt shaft of the bolt 33. . The support shaft 32 has a U-shaped fitting portion 36 and a connecting portion 3
7 is fixedly mounted, the fitting body 36 of the operating lever 27 is fitted to the fitting portion 36 of the support member 38, and the fitting body 29 is fixed by the bolt nut 39 in the left-right direction. Left and right first shaft 4 which is the bolt shaft of
It is rotatably supported around 0.

Therefore, the operation lever 27 can be rocked around the first shaft 40 in the left-right direction in the front-rear direction or in the up-down direction with the base end side as a fulcrum.
With the base end side as a fulcrum, the second axis in the direction orthogonal to the first axis 40
A swing operation can be performed in the left-right direction around the shaft 35. Mounting body 2
9, a ball joint 43 is detachably attached via a screw shaft 42 screwed to the attachment body 29, and the ball joint 43 is
The first interlocking body 47 is connected via a screw shaft 46 screwed to the female screw portion 45 of the ball joint 43.

As shown in FIGS. 12 and 13, the first interlocking body 47 is formed in a U-shape, and a screw shaft 46 is fixedly provided at one end portion on the operation lever 27 side and is connected to the other end portion. A piece 48 is projectingly provided, and the first interlocking body 47 is connected to the first spool 51 of the control valve 21 via a connecting piece 48 by a mounting pin 52 so as to be swingable around the mounting pin 52. . As a result, the operating lever 27 is moved to the first shaft 40
By swinging from the neutral position N1 to be described later in the front-rear direction or the up-down direction, the attachment body 29 swings around the first shaft 40 together with the operation lever 27, and the first interlocking body 47 moves the arrows a, b. Direction, and pushes and pulls the first spool 51 in the same direction. As a result, the boom cylinder (in response to the backward or downward swinging operation of the operating lever 27 by the operation of the control valve 21). Hydraulic system) 12
The boom 7 swings upward (first
Of the boom cylinder (hydraulic device) 12 in response to the swinging operation of the operating lever 27 in the forward or upward direction.
The boom 7 swings downward (1st
Work operation).

A connecting shaft 55 is attached to the connecting portion 37 of the supporting member 38.
The second interlocking body 56 is rotatably fitted around the connecting shaft 55 via the connecting cylindrical body 57 around the connecting shaft 55, and is prevented from coming off by a retaining pin 58. Second
As shown in FIGS. 14 and 15, the interlocking body 56 is formed in a U shape, a connecting cylinder 57 is fixedly provided at one end on the operation lever 27 side, and a connecting piece 59 projects at the other end. The second interlocking body 56 is installed on the second side of the control valve 21.
The spool 61 is connected via a connecting piece 59 by a mounting pin 62 so as to be swingable around the mounting pin 62.

As a result, the operation lever 27 is moved to the second shaft 3
By swinging from the neutral position N2 described later about 5 times in the left-right direction, the support member 38 swings around the second shaft 35 together with the operating lever 27, and the second interlocking body 56 moves the arrow a ,.
It moves in the b direction and pushes and pulls the second spool 61 in the same direction. As a result, the operation of the control valve 21 causes
For example, in response to the leftward swinging operation of the operation lever 27, the bucket 8 performs a squeezing operation (second work operation) by the contraction operation of the bucket cylinder (hydraulic device) 13.
In response to the rightward swinging operation of the operation lever 27, the bucket cylinder 8 (hydraulic device) 13 is extended to cause the bucket 8 to perform a dump operation (second work operation).

First spool 51 portion or operating lever 27
The operation lever 27 is configured to automatically return to the neutral position N1 around the first shaft 40 in the front-rear direction or the up-down direction by a return spring or the like (not shown) provided at the base of the operation lever 27. In addition, the operation lever 27 is moved to the second spool 51 part or the return spring (not shown) provided at the base of the operation lever 27.
It is configured to automatically return to the left-right neutral position N2 around the shaft 35. As shown in FIG. 7, a lock mechanism 65 is provided between the control valve 21 of the valve stay 25 and the operation lever 27 to lock the operation lever 27 so as not to swing. The lock mechanism 65 includes a locking member 66, a lock lever 67, and a lock lever guide 76.

2 to 4 and 7, a holding cylinder 70 in the left-right direction is fixed to the valve stay 25 via a support base 69, and the tip (right end) of the locking member 66 is tapered. The locking member 66 is formed and is fitted and held in the holding cylinder 70 so as to be movable left and right. The first interlocking body 47 is provided with the first engaging hole 71, the second interlocking body 56 is provided with the second engaging hole 72, and the operating lever 27 is in the neutral position N1, N2.
The first engaging hole 71 of the first interlocking body 47 and the second
The second engaging hole 72 of the interlocking body 56 moves to a position corresponding to the locking member 66, and at this time, the locking member 66 is moved to the right in the left-right direction, so that the locking member 66 moves to the first position. The first engaging hole 7 is inserted through the first engaging hole 71 and the second engaging hole 72.
The first interlocking body 47 and the second interlocking body 47 through the first and second engaging holes 72.
It is configured to engage with the interlocking body 56, whereby the operation lever 27 is unlockably locked so as not to swing. Therefore, as shown in FIG.
Is movably held at an engagement position A1 that engages the first interlocking body 47 and the second interlocking body 56 and an engagement release position B1 that disengages from the first interlocking body 47 and the second interlocking body 56. There is.

A lock lever 67 is projectingly provided on the base end portion of the locking member 66 via a support arm 75.
This is for moving the locking member 66 to the engagement position A1 and the engagement release position B1. A lock lever guide 76 is provided so as to cover the holding cylinder body 70 and the locking member 66 from the upper side, and the lock lever guide 76 is fixed to the valve stay 25 by an attachment 77 such as a bolt. A U-shaped guide groove 79 is formed in the lock lever guide 76, and the lock lever 67 is vertically inserted through the guide groove 79. One end of the guide groove 79 has a lock position A.
2 and the other end is in the unlocked position B2, and when the lock lever 67 is set to the lock position B1 of the guide groove 79 when the operation lever 27 is in the neutral positions N1 and N2, the locking member is When the lock lever 67 is moved to the engagement position A1 and the lock lever 67 is set to the lock release position B2 of the guide groove 79, the locking member 66 is moved to the engagement release position A2.

Lock lever 67 and lock lever guide 7
A spring 80 is connected between the lock lever 67 and the lock lever 67.
9 is biased to the lock position B1 or the lock release position B2 side, and the lock lever guide 76 and the spring 80 constitute a positioning mechanism 81 for positioning and holding the lock lever 67 at the lock position B1 and the lock release position B2. Has been done. A cover body 83 is attached to the valve stay 25. The cover body 83 is fixed to the valve stay 25 via a plurality of mounting legs 84. The cover body 83 is provided with an insertion groove 86 corresponding to the guide groove 79 and an insertion hole 87 into which the operation lever 27 is inserted.

According to the above-described embodiment, when the front loader 4 is operated, if the lock lever 67 is set to the unlock position B2 of the guide groove 79, the locking member 66 can be obtained.
Moves to the disengagement position A2, the locking member 66 is disengaged from the first interlocking body 47 and the second interlocking body 56, and the locking mechanism 6 is released.
Since the lock of 5 is released, the operation lever 2
7 is swingable around the first shaft 40 and the second shaft 35. Therefore, the operation lever 27 is set to the first shaft 4
The first interlocking body 47 moves in the directions of the arrows a and b by swinging the front-rear direction or the up-down direction about 0, and as a result, the boom cylinder (hydraulic device) 12 expands and contracts by the operation of the control valve 21. By the operation, the boom 7 swings vertically (first working operation). Further, by swinging the operating lever 27 in the left-right direction around the second shaft 35, the second interlocking body 56 moves in the directions of the arrows a and b, and as a result, the control valve 21 is actuated.
The bucket cylinder (hydraulic device) 13 expands and contracts, and the bucket 8 performs a squeezing operation / a dumping operation (second work operation).
do.

When the front loader 4 is not operated, the lock lever 67 is moved to the lock position B of the guide groove 79.
When set to 1, the locking member 66 moves to the engagement position A1, the locking member 66 engages with the first interlocking body 47 and the second interlocking body 56, and is locked by the lock mechanism 65. As a result, the operating lever 27 cannot be oscillated around the first shaft 40 and the second shaft 35, so that the boom 7 cannot be unexpectedly contacted even if the operating lever 27 is inadvertently contacted during traveling or the like. There is no possibility of swinging to the end or the bucket 8 performing a squeeze / dump operation.

[0022]

According to the present invention, the lock mechanism 65 allows the operation lever 27 to be easily locked so as not to swing, and the work machine is unexpectedly contacted with the operation lever 27 even if the operation lever 27 is inadvertently contacted. It can be prevented from operating.

[Brief description of drawings]

FIG. 1 is a side view of a front loader.

FIG. 2 is a side sectional view of the operating device.

FIG. 3 is a front view of the operating device.

FIG. 4 is a front view of the operating device with a cover body removed.

5 is a cross-sectional view taken along the line AA of FIG.

6 is a cross-sectional view taken along the line BB of FIG.

7 is a cross-sectional view taken along the line CC of FIG.

FIG. 8 is a front view of a locking member and a lock lever.

FIG. 9 is a plan view of a locking member and a lock lever.

FIG. 10 is a plan view of a lock lever guide.

FIG. 11 is a plan view of a cover body.

FIG. 12 is a side view of the first interlocking body.

FIG. 13 is a plan view of a first interlocking body.

FIG. 14 is a side view of a second interlocking body.

FIG. 15 is a side view of a second interlocking body.

FIG. 16 is a side view of an operation lever.

FIG. 17 is a plan view of an operation lever.

[Explanation of symbols]

4 Front loader (working machine) 21 Control valve 27 Operation lever 35 Second axis 40 First axis 47 First interlocking body 51 first spool 56 Second interlocking body 61 Second spool 65 Lock mechanism 66 Locking member 67 Lock lever 76 Lock lever guide 81 Positioning mechanism

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 2D003 BA07 EA04                 3J070 AA03 BA03 BA09 BA35 BA41                       CB39 CC63 CC64 CD11 DA21                       EA11

Claims (5)

[Claims] 1. When the operating lever (27) is swung about the first shaft (40), a first work operation is performed, and the operating lever (27) is swung around the second shaft (35). When I did
The operation device for a working machine configured to perform the second work operation is provided with a lock mechanism (65) for unlocking the operation lever (27) so that the operation lever (27) is not rocked. Machine operation device. 2. A first interlocking body (47) is provided which moves in conjunction with the swinging motion of the operating lever (27) around the first shaft (40) in order to perform the first work motion. A second interlocking body (56) is provided that moves in conjunction with the swinging motion of the operation lever (27) around the second shaft (35) to perform a work operation. The first interlocking body (47) and the second interlocking body (47) are provided. A locking member (66) that engages and disengages so as to immobilize the body (56),
The operating device for a working machine according to claim 1, wherein the operating mechanism is provided in the lock mechanism (65). 3. The locking member (66) comprises a first interlocking body (4).
7) and the engaging position A1 for engaging the second interlocking body (56)
And a disengagement position A2 that is disengaged from the first interlocking body (47) and the second interlocking body (56), and the locking member (66) is movably held, and the engaging position A1 and the disengagement position A2. The operating device for a working machine according to claim 2, wherein a lock lever (67) for moving and operating is provided. 4. The lock lever (67) is attached to a locking member (6).
A lock lever guide (76) for guiding a lock position B1 for moving 6) to the engagement position A1 and a lock release position B2 for moving the engagement member (66) to the engagement release position A2 is provided. A positioning mechanism (8) for positioning and holding (67) at the lock position B1 and the lock release position B2.
1) The operating device for a working machine, wherein the operating device is provided. 5. A control valve (21) is provided, and the first spool (51) of the control valve (21) is operated by the movement of the first interlocking body (47) to move the first spool through a hydraulic device. When a work operation is performed, the second spool (61) of the control valve (21) is operated by the movement of the second interlocking body (56), and the second spool (61) is moved to a second position via a hydraulic device.
An operating device for a working machine, wherein the operating device is configured to perform the working operation of.