JPH0941426A - Operation part structure for working traveling vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate adjustment of a wire by directly connecting left and right passage interrupting levers in such a manner that the left passage interrupting lever is posture-changed interlockingly with the opening operation of the right passage interrupting lever. SOLUTION: When a left passage interrupting lever 16L is opened, only an inner wire is loosened, and a left operating lever box 11L is solely raised. On the other hand, when a right passage interrupting lever 16R is opened, the inner wire is pulled, the left passage interrupting lever 16L is interlockingly changed to opened posture, and a left operating lever box 11L is also interlockingly raised according to this lever posture change. Namely, when the passage interrupting lever 16R arranged on the right entrance side with low getting-on and -off frequency is raised, the left operating lever box 11L is interlockingly raised. Thus, when a person gets off from the right entrance with low getting-on and -off frequency, and gets on from the left entrance with high getting-on and -off frequency, he can get on without particularly raising the left passage interrupting lever 16R.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of working vehicles such as hydraulic excavators.

[0002]

2. Description of the Related Art Generally, in a traveling vehicle of this type, an operation lever box to which operation levers are attached is provided on both left and right sides of a driver's seat provided in an operation section, and a passage for blocking a right and left entry / exit passages. Although there are those that are equipped with a blocking lever (safety lever) respectively, the left and right operation lever boxes may block the entry / exit passage and reduce the entry / exitability. It has been proposed to retract and rotate the rearward raised position in conjunction with the opening operation of the.

[0003]

In the above, however, when getting off from one of the entry / exit passages and then trying to get on from the other entry / exit passage, the operation lever box on the entry / exit passage side to get on is lowered. Because it is in a state, it is necessary to purposely raise the operation lever box when getting on, and in such a situation, when there is a difference in the usage frequency of the left and right passages There is a high possibility that it will occur, and some measure was desired.

Therefore, when the applicant operates to open the passage blocking lever on the side of the entry / exit passage where the boarding / alighting frequency is high, the applicant alone raises only the operating lever box on the same side, as disclosed in Japanese Patent Laid-Open No. 7-62689. On the other hand, when opening / closing the passage blocking lever on the side of the entry / exit passage, which has a low entry / exit frequency, it was proposed that the left and right operation lever boxes be interlocked.

However, in this device, the hook plate that locks the operation lever box in the lowered position is transformed into the unlocked position by pushing the hook plate with the cam plate provided on the passage blocking lever, and the passengers get on and off less frequently. When the hook plate on the aisle side is transformed into the unlocked posture, the other hook plate is also transformed into the unlocked posture so that the hook plates are connected to each other via the wire,
Even if the other operation lever box moves up in a linked manner, the passage blocking lever on the linked upside maintains the passage blocking posture and hinders the passengers from riding, and since the connection between the passage blocking lever and the wire is indirect, Adjustment of wires and the like also becomes difficult, and there is a problem to be solved by the present invention.

Further, it is known that the left and right operation lever boxes are slidable back and forth. However, when one operation lever box slides relatively, the above-mentioned connecting wire is pulled and the other operation lever box is pulled. There was a possibility that the operating lever box would move up in tandem.

Further, in such a device, an engine start safety switch for detecting the rising posture of the operating lever box and a hydraulic operation safety switch for detecting the shutting posture of the passage blocking lever may be provided. When it is slid, relative displacement may occur between the operation lever box and the switch, and the detected load acting on each switch may fluctuate.

[0008]

SUMMARY OF THE INVENTION The present invention was created with the object of providing an operating portion structure for a work vehicle capable of solving these problems in view of the above circumstances. On both left and right sides of the driver's seat provided in the operation section, an operation lever box to which operation levers are attached and passage blocking levers for blocking the left and right entry / exit passages are provided, and the left and right operating levers are further provided. In a working vehicle for retracting and turning a box to a rearwardly raised position in conjunction with an opening operation of a passage blocking lever arranged on the same side, of the left and right passage blocking levers, the one on the side of a boarding / alighting passage that has a high entry / exit frequency is used. When the passage blocking lever is opened, only the control lever box on the same side is raised,
When opening and closing the passage blocking lever on the side of the boarding / alighting passage where the boarding / alighting frequency is low, interlocking with the opening operation of the passage blocking lever installed on the side of the boarding / alighting passage where the boarding / alighting frequency is low Then, the left and right passage blocking levers are connected so that the other passage blocking lever is transformed into the open position. Therefore, when the other operation lever box is interlocked and raised, it is possible to eliminate the inconvenience that the passage blocking lever on the linked raised side maintains the passage blocking posture and obstructs the passengers. Can be simplified to facilitate wire adjustment and the like.

Further, in the above-mentioned one, when the left and right passage blocking levers are respectively assembled to the operation lever box on the same side, the left and right operation lever boxes are integrally slidable back and forth. It is possible to eliminate the inconvenience that the connecting member such as the connecting wire is pulled and the other operation lever box is interlocked and raised as in the case where the relative sliding of the box is allowed.

In addition, in the above-mentioned one in which the engine start safety switch for detecting the rising posture of the operation lever box is made to follow the slide of the operation lever box integrally, in the operation lever box and the engine start safety. It is possible to eliminate the inconvenience that the detected load of the engine start safety switch fluctuates based on the positional deviation from the switch.

Further, in the above-mentioned one in which the hydraulic operation safety switch for detecting the shut-off posture of the passage shut-off lever is made to follow integrally with the forward and backward slide of the operating lever box, the passage provided in the operating lever box is provided. It is possible to eliminate the inconvenience that the detected load of the hydraulic operation safety switch fluctuates based on the positional deviation between the cutoff lever and the hydraulic operation safety switch.

[0012]

Next, one embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a hydraulic excavator, and the hydraulic excavator 1 includes a crawler type lower traveling body 2, an upper revolving body 3 rotatably provided above the lower traveling body 2 and a front end of the upper revolving body 3. Each of the above-mentioned parts is hydraulically operated by the power of an engine (not shown) mounted on the rear part of the upper revolving superstructure 3 and has a basic structure. Are conventional.

Reference numeral 5 denotes an operation section provided on the upper revolving structure 3, and the access ports 5a and 5b are provided on both left and right sides of the operation section 5.
However, normally, the left side entrance / exit 5a is exclusively used and the right side entrance / exit 5b is used auxiliary.

Reference numeral 6 denotes a slide frame provided on the operation portion 5, and the slide frame 6 is supported by a pair of left and right guide rails 8 laid on the seat frame 7 so as to be slidable back and forth. Then, on the upper portion of the slide frame 6, a driver's seat 1 is provided via a seat bracket 9.
On the other hand, the operation lever boxes 11L and 11R are respectively attached to the left and right sides of the slide frame 6, so that the driver's seat 10 and the left and right operation lever boxes 11L can be operated based on the forward and backward slide operation of the slide frame 6. , 11R slides back and forth integrally, but since the driver's seat 10 is attached to the seat bracket 9 so as to be slidable forward and backward, the driver's seat 10 and the left and right are operated based on the independent sliding operation of the driver's seat 10. It is also possible to adjust the front-rear position relative to the lever boxes 11L and 11R.

The left and right operation lever boxes 11L, 1
1R is an assembly of operation levers 12L and 12R (including a pilot valve 13 that operates based on lever operation) for operating the working unit 4 and the swing operation of the upper swing body 3. Box 11L, 11R
The boss 11a provided at the rear end of the boss 11a is rotatably supported by the box support shaft 14 protruding leftward and rightward from the slide frame 6, so that the box support shaft 14 serves as a fulcrum to operate the lever box 11L. , 11R can be retracted and rotated to the rearward rising position.

Reference numeral 15 is an operation lever box 11L, 11R
Is a damper that constantly urges the
5 is provided between the operation lever boxes 11L and 11R and the slide frame 6. In other words, the operation lever boxes 11L and 11R can be always retracted and raised at a constant speed in order to maintain a constant distance from the box support shaft 14 regardless of the front and rear sliding of the operation lever boxes 11L and 11R.

Reference numerals 16L and 16R denote passage blocking levers arranged on both the left and right sides of the driver's seat 10. The passage blocking levers 16L and 16R have a blocking posture in which they are tilted forward to block the entry / exit passage, and rearward. It can be freely rotated to the open posture in which it stands up and opens the entry / exit passage.
The boss portion 16a of 16R is assembled to the operation lever boxes 11L and 11R via the lever support shaft 17. Further, 16b is a connecting plate protruding upward from the boss portion 16a, and the passage blocking lever 1 is provided between the connecting plate 16b and the operating lever boxes 11L and 11R.
Ammunition 1 for urging 6L and 16R to the normally closed posture
8 is installed.

Reference numeral 19 denotes the passage blocking levers 16L and 16R.
Guide plate 1 which is provided integrally with the boss 16a of the guide plate 19 and has a guide groove 1 which is arcuate as a whole and has a locking groove 19b at one end.
9a is formed, and a guide pin 26 protruding outward from the slide frame 6 to the left and right is movably fitted in the guide hole 19a. That is, when the passage blocking levers 16L and 16R are in the blocking posture, the guide pin 26 is located in the locking groove portion 19b, so the damper 15
The operation lever boxes 11L and 11R are locked in the lowered position against the biasing force of the passage blocking levers 16L and 16R.
When the opening operation is performed, the movement of the guide plate 19 along the guide hole 19a is allowed, so that the operation lever boxes 11L and 11R and the passage blocking levers 16L and 16L are provided.
R receives the biasing force of the damper 15 and automatically rises.

20 is a left and right operation lever box 11L,
A connecting wire for interlocking 11R, the connecting wire 20 is a so-called Bowden wire consisting of a flexible inner wire and an outer tube for inserting and guiding the inner wire, and both ends of the outer tube are , The left and right operation lever boxes 11L and 11R are locked, but of the both ends of the inner wire protruding from both ends of the outer tube, the left end is upward from the boss portion 16a of the left passage blocking lever 16L. While being connected to the above-mentioned connecting plate 16b that protrudes, the right end is
It is connected to a second connecting plate 16c protruding downward from the boss portion 16a of the right passage blocking lever 16R. That is, when the left side passage blocking lever 16L is operated to open, the inner wire is only loosened. Therefore, the left operation lever box 11L rises alone, while when the right side passage blocking lever 16R is operated to open, the inner wire is released. Since it is pulled, the left passage blocking lever 16L is interlocked to change to the open posture, and the left operation lever box 11L is also interlocked to rise with this lever change.

Reference numeral 21 denotes an engine start safety switch, which includes a starter motor (not shown) for starting the engine and a battery (not shown) for supplying an operating current to the starter motor. , A contact switch of a key switch (not shown) and an a-contact detection switch connected in series. Then, this one allows the engine to be started by detecting the rising posture of the left operation lever box 11L, but since it is attached to the slide frame 6, it is possible to integrally follow the front-rear slide of the left operation lever box 11L. Has become. That is, the detected load (the operation lever box 11L) is irrespective of the front and rear sliding position of the left operation lever box 11L.
Since the moment load of L) is constant, the urging force of the damper 15 can be set to a necessary minimum and the left operation lever box 11L can be gently raised.

Reference numeral 22 is a hydraulic operation safety switch, and the hydraulic operation safety switch 22 is a detection switch which functions as a restriction release switch of a hydraulic operation restricting mechanism (not shown) for restricting hydraulic operation of the working section 4 and the like. is there. Then, this one detects the blocking posture of the left side passage blocking lever 16L based on the contact with the connecting plate 16b, and releases the regulation of the hydraulic operation regulation mechanism. It is assembled so that it can follow them together. That is, since the detected load is constant regardless of the front-rear slide position of the left operation lever box 11L,
The operating force and the like of the left passage blocking lever 16L can be made constant.

Reference numeral 23 denotes a stopper bracket projectingly provided on one side of the driver's seat 10. A pipe 23a facing the front-rear direction is integrally welded to the tip of the stopper bracket 23. A stopper body 24 having a cushioning rubber 24a at the rear end is fitted into the pipe 23a and is locked by a snap pin 25. The stopper body 24 functions as a driver's seat slide stopper that restricts further sliding when the driver's seat 10 slides to the rear limit position, but the stopper body 24 has an insertion hole (not shown) for the snap pin 25. ) Are formed, and the front and rear set positions of the stopper body 24 can be changed by appropriately selecting the insertion holes. That is, even if the rear member with which the stopper body 24 abuts and the slide limit position of the driver's seat 10 are different for each specification (canopy specification, cab specification without cooler, cab specification with cooler). It is possible to avoid the contact between the driver's seat 10 and the rear member only by changing the set position.

In the vehicle constructed as described above, when getting off, the operation lever boxes 11L and 11R are raised to the rearward retracted positions based on the operation of the passage blocking levers 16L and 16R, and then get off. After that, the raised operation lever boxes 11L and 11R are directly pushed by a hand to descend, but the passage blocking lever 1 disposed on the right side entrance / exit opening 5b side where the entry / exit frequency is low.
When 6R is operated to be lifted, the left operation lever box 11L is also automatically lifted in conjunction with it. That is, when getting off from the right-hand side entrance / exit 5b with low ingress / egress frequency and then getting on from the left-hand entrance / exit 5a with high ingress / egress frequency, the left operation lever box 11L is retracted to the ascending position in advance, so It is possible to get on the vehicle without operating the left passage blocking lever 16L to move up.

As described above, in the above-mentioned one, of the left and right passage blocking levers 16L and 16R, the right passage blocking lever 16
When the opening operation of R is performed, the left and right operation lever boxes 11L and 11R are interlocked and raised, but the opening operation of the right passage blocking lever 16R is interlocked with the left passage blocking lever 16L.
Left and right passage blocking levers 16 to transform L to the open position
Since the L and 16R are directly connected to each other via the connecting wire 20, it is possible to eliminate the inconvenience that the left passage blocking lever 16L maintains the passage blocking posture and interferes with the riding even though the left operation lever box 11L is moved upward. Forgive me,
By simplifying the connection structure between the passage blocking levers 16L and 16R, it is possible to facilitate wire adjustment and the like.

Moreover, when the passage blocking levers 16L and 16R are assembled to the operation lever boxes 11L and 11R, respectively, the left and right operation lever boxes 11L and 11R are integrally slidable in the front and rear directions. It is possible to eliminate the inconvenience that the connecting wire 20 is pulled and the left operation lever box 11L rises without permission as in the case where the boxes 11L and 11R relatively slide.

Further, an engine start safety switch 21 for detecting the rising posture of the left operation lever box 11L is
Since the front and rear slides of the left operation lever box 11L are made to follow integrally, it is possible to prevent the detected load of the engine start safety switch 21 from varying based on the positional deviation between the left operation lever box 11L and the engine start safety switch 21. As a result, the urging force of the damper 15 is set to the necessary minimum and the left operation lever box 11L
Can be gradually increased.

Furthermore, since the hydraulic operation safety switch 22 for detecting the shut-off posture of the left side passage shutoff lever 16L is made to follow the slide of the left side actuated lever box 11L integrally, the left actuated lever box 11
The detection load of the hydraulic operation safety switch 22 can be prevented from fluctuating based on the positional deviation between L and the hydraulic operation safety switch 22, and as a result, the operating force of the left passage blocking lever 16L and the like can be made constant.

[Brief description of drawings]

FIG. 1 is a side view of a hydraulic excavator.

FIG. 2 is a plan view of the same.

FIG. 3 is a front view of an operation unit.

FIG. 4 is a plan view of a main part of the same.

FIG. 5 is a side view of a main part of the above.

FIG. 6 is an exploded perspective view of a main part of the same.

FIG. 7 is a side view of an essential part showing the action of the stopper.

[Explanation of symbols]

 1 hydraulic excavator 5 operation part 6 driver's seat 11 operation lever box 16 passage blocking lever 20 connecting wire 21 engine start safety switch 22 hydraulic operation safety switch

Continuation of the front page (72) Inventor Naoshi Funo 667 Isuya-cho, Hijizumo-cho, Yatsuka-gun, Shimane Prefecture 1 Mitsubishi Agricultural Machinery Co., Ltd.

Claims (4)

[Claims] 1. An operation lever box in which operation levers are attached to both left and right sides of a driver's seat provided in an operation section,
A passage blocking lever for blocking the left and right entry / exit passages is provided, and the left and right operation lever boxes are
In a working vehicle that is retracted and rotated to a rearward rising position in conjunction with the opening operation of the passage blocking lever arranged on the same side,
Of the left and right passage blocking levers, when the passage blocking lever on the side of a boarding / alighting passage with a high loading / unloading frequency is opened, only the operation lever box on the same side is raised alone, while the passage on the boarding / alighting passage side with a low loading / unloading frequency When the cutoff lever is opened, the other passage cutoff lever is opened in conjunction with the opening operation of the passage cutoff lever arranged on the side of the entry / exit passageway where passengers get on and off infrequently when raising and lowering the left and right operation lever boxes. The structure of the operation part of the work vehicle that connects the left and right passage blocking levers to change the posture. 2. The operating unit for a working vehicle according to claim 1, wherein when the left and right passage blocking levers are respectively attached to the operation lever boxes on the same side, the left and right operation lever boxes are integrally slidable back and forth. Construction. 3. The operation part structure for a working vehicle according to claim 2, wherein an engine start safety switch for detecting a rising posture of the operation lever box is integrally followed by a front and rear slide of the operation lever box. 4. The operation part structure for a working vehicle according to claim 2, wherein the hydraulic operation safety switch for detecting the shut-off posture of the passage shut-off lever is integrally followed by the front-back slide of the operation lever box.