JPH0745650Y2 - Working machine operation lever device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an operating lever device for a working machine such as a backhoe.

[Prior Art] Conventionally, in a work machine such as a backhoe, two operation levers that move forward, backward, leftward, and rightward to operate an arm, a boom, a bucket, and the like are provided, and the operation patterns of these operation levers are manufacturer. Depends on.
For example, tilting one of the control levers forward raises the arm, tilting it rearward results in arm scraping, tilting left to turn left, tilting right to turn right, and passing the other control lever forward lowers the boom. When you knock it down, it will raise the boom,
In addition, if it is tilted to the left, it will be a bucket dump and if it is tilted to the right, it will be a bucket dump.

For this reason, the operator has to remember each operation pattern, which is inconvenient, and there is a risk of erroneous operation at the beginning of learning.

In order to solve such a problem, the operation pattern was switched by increasing the number of parts or replacing the parts, but the replacement work was very complicated.

As a means to solve such a problem, the actual exploitation Sho 63-6
In Japanese Patent No. 5764, an operation lever device is proposed in which a bell crank connected to one lever and a bell crank connected to the other lever can be selectively connected to an operation lever by changing a connecting position of a connecting plate. Has been done.

[Problems to be Solved by the Invention] In the prior art, the connection mechanism of one operation lever device is changed so that it can be changed to another different operation pattern. There is a problem that it is not possible to deal with changes in many types of operating lever patterns.

In order to solve the above problems, the present invention provides an operating lever device for a working machine capable of selecting various types of operating patterns by changing the coupling mechanism between a pair of operating levers arranged in parallel. With the goal.

[Means for Solving the Problem] The present invention provides a first device provided on the left and right sides of a control box.
And a second operation lever, a first operation side rod having one end connected to a first joint interlocking with the first operation lever, and a first connection receiving portion formed on a first bracket interlocking with the first operation lever. A second operation-side rod whose one end is connected to the second operation lever; a third operation-side rod whose one end is connected to a second joint that interlocks with the second operation lever; and a second bracket that interlocks with the second operation lever. A fourth operation-side rod whose one end is connected to the second connection receiving portion, a plurality of bell cranks to which the other ends of the first to fourth drive-side rods are connected, and a plurality of which one end is connected to each of the bell cranks A third driven rod, which is formed on the first bracket on the rotation locus of the one end of the fourth operating rod with the other end as the center of rotation and is connectable to the fourth operating rod.
A connection receiving portion, and a fourth connection receiving portion formed on the second operation side rod on the rotation locus of the one end of the second operation side rod about the other end as a rotation center and capable of connecting the second operation side rod. A rod end assembly bolt is interposed between a part of the second and fourth operation side rods and the connection receiving portion, and between the other end of the operation side rod and the bell crank. And a retaining pin is provided on the pivot shaft, and a collar is interposed between the rod end assembly bolt and the bracket.

[Operation] When the operation pattern is changed from the state in which the second operation side rod is connected to the first connection receiving portion in advance and the fourth operation side rod is connected to the second connection receiving portion, the second operation receiving rod is connected to the second operation receiving rod. The operation pattern can be changed by connecting the operation side rod and connecting the fourth operation side rod to the third connection receiving portion. Further, the collar and the rod end assembly bolt can easily connect the tips of the second and fourth operation side rods to the first and second and third and fourth connection receiving portions, and the other end of the operation side rod It can be easily handled with the retaining pin.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the accompanying drawings.

Reference numeral 1 denotes a control box provided in a driver's seat (not shown) of a working machine such as a backhoe, and the control box 1 is provided with first and second operation levers 2 and 3. 3 operates each actuator in an operation pattern as shown in FIG.

The forward (arrow A direction) and backward (arrow C direction) movements of the first operating lever 2 are adapted to interlock with the first joint 4, and the first operating lever 2 leftward (arrow B direction) and The movement to the right (in the direction of arrow D) interlocks with the first bracket 5. One end 6A of the first operation side rod 6 is pivotally attached to the first joint 4, and the boss-shaped first connection receiving portion 7 is formed on the first bracket 5. One end 8A of the second operation side rod 8 is pivotally attached to 7. Further, a boss-shaped third connection receiving portion 9 to which the fourth operation-side rod can be connected is formed at a portion of the first bracket 5 on the rotation locus X of the one end 16A of the fourth operation-side rod 16 which will be described in detail later. ing. The first connection receiving portion 7 of the first bracket 5 directly connected to the first operation lever 2 and one end 8A of the second operation side rod 8 are interlocked by a rod end assembly bolt 11 having a pair of collars 10 interposed therebetween. Are connected to each other. Similarly, the forward (arrow E direction) and rearward (arrow G direction) movements of the second operating lever 3 are linked to the second joint 12, and the second operating lever 3 leftward (arrow F). Direction) and rightward (arrow H direction) movement is the second
It is designed to work with the bracket 13. And the second
One end 14A of the third operating side rod 14 is pivotally attached to the joint 12, and a boss-shaped second connection receiving portion 15 is formed on the second bracket 13, and the second connection receiving portion 15 has a fourth connection receiving portion 15. One end 16A of the operation side rod 16 is pivotally attached. Furthermore the other end 8B
A fourth connection receiving portion 17 to which the second operation side rod 8 can be connected with the same rod length at a portion of the second bracket 13 on the rotation locus Y of the one end 8A of the second operation side rod 8 about the rotation center of Are formed.

18 is a support shaft horizontally provided in the control box 1,
The support shaft 18 has first to eighth bell cranks 19, 20, 21, 2
2,23,24,25,26 are rotatably provided, and the third and fourth bell cranks 21,22 are fixed by a first connecting plate 27, and the first and seventh bell cranks 19,25 are provided. Is color 2
It is fixed to the second connecting plate 30 with bolts 31 and 32 via 8, 29, and the fifth bell crank 23 is also fixed with bolts 33. The other end of the first operating side rod 6 is attached to the first bell crank 19.
6B is pivotally attached, and the arm control valve 3 connected to the 7th bell crank 25 and the arm cylinder 35A 3
A first driven rod 36 is interposed between the five. Therefore, when the first operating lever 2 is moved in the directions of arrows A and C,
This operation is performed by the first operating rod 6, the first bell crank 19,
The first control rod 35 can be operated by operating the first driven rod 36 via the second connecting plate 30 and the seventh bell crank 25.

39 is a frame fixed to the control box 1,
An intermediate bell crank 40 is pivotally supported on the frame body 39. Both ends 42A and 42B of the second driven rod 42 are connected to the lever portion 41 of the intermediate bell crank 40 and the third bell crank 21 fixed to the fourth bell crank 22. The interlocking rod 44 is interposed between the upper arm 40A and the turning control valve 43 connected to the turning device 43A. Therefore, the first operating lever 2 is moved to the arrow B, D
When moved in the direction, the operation is performed via the second operating side rod 8, the fourth bell crank 22, the first connecting plate 27, the third bell crank 21, the second driven side rod 42, the intermediate bell crank 40 and the interlocking rod 44. It can be transmitted to the turning control valve 43 connected to the turning device 43A.

The fourth operation side rod 16 has one end on the second connection receiving portion 15.
16A is connected and the other end 16B is connected to the sixth bell crank 24. The bucket control valve 46 connected to the sixth bell crank 24 and the bucket cylinder 46A has both ends of the fourth driven side rod 47. It is connected. Therefore, when the second operating lever 3 is moved in the directions of arrows F and H, the operation is performed by the fourth operating rod 14, the sixth bell crank 24 and the third operating lever 14.
It can be transmitted to the bucket control valve 46 via the driven rod 47.

The third operating side rod 14 has one end 14A on the second joint 12.
And the other end 14B is also connected to the eighth bell crank 26. The eighth bell crank 26 and the boom cylinder.
Both ends of a third driven rod 49 are connected to the boom control valve 48 connected to 48A. Therefore, when the second operation lever 3 is moved in the directions of arrows E and G, the operation is transmitted to the boom control valve 48 via the third operation side rod 14, the eighth bell crank 26 and the third driven side rod 49. It has become.

As shown in FIG. 7, the other end 14B of the third operating side rod 14 is
To replace the 7th and 8th bell cranks 25 and 26, insert the pivot shaft 37 with the tips facing each other, and slidably attach the β type retaining pin 38 to the end portion of the pivot shaft 37. It is provided so that the connection can be changed easily.

Next, the first and second operating levers 2 shown in FIG.
A case where the operation pattern 3 is changed to the operation pattern shown in FIG. 8C will be described.

First, as shown in FIG. 3, the rod end assembly bolts 11 are pulled out from the first and second connection receiving portions 7 and 15, and the second and fourth operation side rods 8 and 16 are removed from the first and second operation receiving rods 8 and 16, respectively.
Remove the bracket 5 and 13 together with the collar 10. Then, with the other end 8B as the center of rotation, one end 8A of the second operation side rod 8 is made to coincide with the fourth coupling receiving portion 17, and this is also set to
At the same time, it is pivotally attached by screwing a rod end assembly bolt (11). Therefore, the second operating lever 3
Is moved in the directions of arrows F and H, the operation is performed by the second bracket.
13, second operating rod 16, third and fourth bell cranks
It is transmitted to the turning control valve 43 via 21, 22 and the second driven side rod 42.

Also, with the other end 16B as the center of rotation, one end 16A of the fourth operating side rod 16 is made to coincide with the third connection receiving portion 9 and this together with the collar 10 is used for the rod end assembly bolt.
Pivot by screwing 11. Therefore, when the first operating lever 2 is moved in the directions of arrows B and D, the operation can be transmitted to the bucket control valve 48 via the fourth operating rod 16, the sixth bell crank 24 and the fourth driven rod 47.

Further loosen the bolt 32 and set the collar 29 to the eighth bell crank 26.
The second connecting plate 30 again with the bolt 32, and the retaining pin 38 is pulled out to interlock the rod.
One end of 44 is connected to the lower arm 40B of the intermediate bell crank 40.

Therefore, when the second operating lever 3 is moved in the directions of arrows E and G, the operation is performed by the third operating rod 14 and the seventh bell crank.
It can be transmitted to the arm control valve 35 via 25 and the second driven side rod 36. When the first operating side rod 6 is moved in the directions of arrows A and C, the operation can be transmitted to the boom control valve 48 via the first operating side rod 6, the second connecting plate 30 and the eighth bell crank 26.

Furthermore, when changing to the operation pattern shown in FIG. 8 (D), as shown by the chain line in FIG.
A pair of oil passages 5 connecting A and the arm control valve 35
By replacing a part of 0, 51 with the coupler 52 so as to be crossed, it is possible to change to "arm scraping" or "arm lowering" in the directions of arrows E and G of the second operation lever 3.

When the operation pattern is changed as shown in FIG. 8 (B), the first and second bell cranks 1 as shown in FIG.
By fixing the first connecting plate 27 between 9 and 20, the movement of the first operating lever 2 in the directions of arrows A and C is transmitted to the second operating rod 8 via the first bell crank 19 and the second bell crank 20. In addition, the movement of the first operating lever 2 in the directions of the arrows B and D allows the fourth bell crank 22, the second connecting plate 30, and the seventh bell crank.
25 and the first driven-side rod 36 may be set.

As described above, in the above embodiment, the first operation lever 2
The first bracket 5 which is interlocked with is provided with the first connection receiving portion 7 in which the one end 8A of the second operation side rod 8 is continuous, and the third connection receiver is provided on the rotation locus X of the one end 16A of the fourth operation side rod 16. The second bracket 13 interlocking with the second operation lever 3 is provided with a second connection receiving portion 15 to which one end 16A of the fourth operation side rod 16 is connected, and one end of the second operation side rod 8 is provided. The second bracket 13 on the rotation locus Y of 8A
Since the fourth connection receiving portion 17 is provided in the
The second and fourth operating side rods 8 and 1 rotate around B and 16B as the center of rotation.
6 can be crossed to connect the second operating side rod 8 to the second operating lever 3 and the fourth operating side rod 16 to the first operating lever 2. Therefore, the operation pattern can be changed easily and the change work can be performed without requiring additional parts.

Furthermore, the connection receiving portions 7,9 of the first and second brackets 5,13,
Since the rod end assembly bolts 11 are interposed between 15,17 and the second and fourth operation side rods 8,16, it is easy to attach / detach the joints 4,12 and the connection receiving portions 7,9,15,17. Can be done. In addition, since the collar 10 is also interposed, the rod ends can be positioned in the brackets 5 and 13.

Moreover, since the other ends of the operating side rods 6, 8, 14 and 16 are pivotally attached to 6B, 8B, 14B and 16B by the β type retaining pin 38, the retaining pin
It can be attached and detached by simply moving 38 in one direction, further improving workability.

Further, since the other ends 6B, 8B, 14B, 16B of the operation side rods 6, 8, 14, 16 are opposed to each other at the tips of the pivot shafts 37 for connecting the other ends,
The operation side rods 6, 8, 14, 16 can be easily moved.

The present invention is not limited to the above embodiment, but various modifications can be made, for example, by changing the arrangement of the first to eighth bell cranks in various ways.

[Advantages of the Invention] The present invention includes first and second operation levers provided on the left and right of a control box, a first operation side rod having one end connected to a first joint interlocking with the first operation lever, and A second operation side rod having one end connected to a first connection receiving portion formed on a first bracket interlocking with the first operation lever, and a third operation side having one end connected to a second joint interlocking with the second operation lever. A rod, a fourth operation-side rod whose one end is connected to a second connection receiving portion formed on a second bracket that interlocks with the second operation lever, and the other ends of the first to fourth operation-side rods are connected. A plurality of bell cranks and a plurality of driven rods having one end connected to each of the bell cranks, and the other end having the other end as a rotation center.
A third connection receiving portion formed on the first bracket on the rotation locus of one end of the operation side rod and capable of connecting the fourth operation side rod, and rotation of one end of the second operation side rod about the other end as a rotation center. The second operation-side rod on the locus is provided with a fourth connection receiving portion to which the second operation-side rod can be connected, and it is easy and short to change various types of operation patterns than ever before. This can be done in a short time, and since no additional parts are required for changing the pattern, it is possible to easily change to various operation patterns even at the work site. Further, since the rod end assembly bolt is interposed between the second and operation side rods and the connection receiving portion, it is possible to easily replace the portion, and since the bolt is provided with the collar, the second and fourth operation is performed. The side rod can be easily replaced. Moreover, since the retaining pin is provided in the connection between the operation side rod and the bell crank, the location can be easily replaced.

[Brief description of drawings]

1 shows a perspective view, FIG. 2 an exploded perspective view, FIG. 3 a modified perspective view, and FIG. 4 another modified perspective view. FIG. 5 is a vertical sectional view, FIG. 6 is a sectional view around the coupling receiving portion, FIG. 7 (A) is a sectional view around the bell crank, and FIG. 7 (B) is a front view of the retaining pin, and FIG. FIGS. 8A to 8D are explanatory views showing operation patterns. 1 …… Control box 2 …… First operation lever 3 …… Second operation lever 4 …… First joint 5 …… First bracket 6 …… First operation side rod 7 …… First connection receiving part 8 …… Second operation side rod 9 …… Third connection receiving part 10 …… Color 12 …… Second joint 13 …… Second bracket 14 …… Operation side rod 15 …… Second connection receiving part 16 …… Fourth operation side Rod 17 …… 4th coupling receiving part 19,20,21,22,23,24,25,26 …… Bell crank 36 …… First driven side rod 42 …… Second driven side rod 47 …… Fourth driven Side rod 49 …… Third driven side rod X, Y …… Path

Claims (4)

[Scope of utility model registration request] 1. A first and second operation lever provided on the left and right of a control box, a first operation rod having one end connected to a first joint interlocking with the first operation lever, and the first operation lever. A second operation side rod whose one end is connected to a first connection receiving portion formed on the first bracket interlocking with, a third operation side rod whose one end is connected to a second joint interlocking with the second operation lever, A fourth operation side rod having one end connected to a second connection receiving portion formed on a second bracket that interlocks with the second operation lever, and a plurality of the other ends of the first to fourth operation side rods are connected. A bell crank and a plurality of driven rods, one end of which is connected to each of the bell cranks, are provided, and the one end of the fourth operation-side rod is formed on the first bracket on the rotation locus with the other end as a rotation center. A third connection receiving portion to which the fourth operation side rod can be connected, and the second operation side formed on the second operation side rod on the rotation locus of one end of the second operation side rod with the other end as a rotation center. 4th that rod can be connected
An operating lever device for a working machine, comprising: a coupling receiving portion. 2. An operating lever device for a working machine according to claim 1, wherein a rod end assembly bolt is interposed between a part of the second and fourth operation side rods and the connection receiving portion. . 3. The work according to claim 1, wherein a pivot shaft is interposed between the other end of the operation side rod and the bell crank, and a retaining pin is provided on the pivot shaft. Machine control lever device. 4. The operating lever device for a working machine according to claim 2, wherein a collar is provided between the rod end assembly bolt and the bracket.