JPH02273815A - Structure of lever attachment part of work vehicle - Google Patents

Abstract

PURPOSE:To always keep a proper operation linking state of an operation lever regardless of its retreating movement by using an operation wire which can be freely bent to secure the linking of the operation lever and attaining the retreating oscillation of the operation lever around an axial center having no relation with the operation axial center. CONSTITUTION:The linking is secured between an operation lever 12 and a control subject via an operation wire 24. At the same time, a lever support member 13 is attached a device body so that the member 13 can freely oscillate with switch around a lower axial center in a range covering an operating position where the lever 12 is set at the side front part of a driving seat through a lever retreating position where the lever 12 is retreated to the outer rear side. A linking mechanism is provided to move the member 13 to the lever retreating position in response to the movement of a lever lock member 17 to the locking position from the lock release position. Thus the lever 12 can be retreated from the get-on/get-off route of a driver just with the operation of the member 27. Furthermore a safe operation of the lever 12 is secured for a long period of time with no different operating feeling caused.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention provides an operating lever that is disposed on the side of a driver's seat, is supported by a lever support member so as to be swingable, and that the operating lever is The present invention relates to a lever mounting structure for a working vehicle, which is provided with a lever locking member that locks the lever at a predetermined operating position and that can be freely operated to release the six levers.

[Conventional technology]

As for the conventional structure of the above-mentioned lever mounting part, for example,
As disclosed in Japanese Patent No. 0-115964, the operating lever and the operated object are interlocked by a link mechanism, and the link mechanism is operated by a linking pusher in conjunction with the switching operation of the lock lever to the locking position. Some models were designed so that the middle part of the pull rod was bent, and the operating lever was retracted and swung rearward accordingly.

[Problem to be solved by the invention]

The structure in the above reference improves operability by locating the control lever at the side and front of the driver's seat during normal driving work, and by retracting and swinging the control lever to the rear when getting on and off, allowing the driver to get in and out of the vehicle. The front and back width of the passageway was increased to make it easier to get on and off the train.

However, as mentioned above, since the linking push/pull rod is bent, after long-term use, the bending pivot portion becomes loose when the lever is operated, resulting in a different feeling when operating the operating lever. This has the disadvantage that there is a risk that the In addition, the operating lever is structured to retract and swing rearward around the operating swing axis.
Since it is located above the side of the driver's seat, there is a problem that, for example, there is a risk that the buttocks will hit the control lever when getting into the aircraft in a hurry, so there is room for improvement.

An object of the present invention is to eliminate the above-mentioned disadvantages through rational structural improvements.

[Means for Solving the Problems] A feature of the present invention is that in the lever mounting structure of a working vehicle described at the beginning, the operating lever and the operated object are interlocked and linked via an operating wire, and the lever support The member can be freely switched and swung around a lower axis between an operating position in which the operating lever is in the front side of the driver's seat and a lever retracted position in which the operating lever is retracted and tilted to the rear and outward side. The mechanism is attached to the lever and is provided with a linkage mechanism that changes the position of the lever support member to the lever retracted position as the lever lock member is operated from the unlocked position to the locking position. It is as follows.

[For production]

In other words, since the operating lever is linked with a bendable and deformable operating wire, the operating lever can be retracted and swung around an axis that is unrelated to the operating axis, and it is always properly adjusted regardless of the retracting movement. It is possible to maintain a state of operational coordination.

Moreover, as the lever lock member is switched, the operating lever retracts around the axis of the lower part of the lever support member that supports it, and backward, outward, that is, diagonally rearward, so the amount of retraction movement is large and will move away from the driver's seat.

〔Effect of the invention〕

As a result, the operating lever can be moved out of the driver's boarding and alighting path simply by operating the lever lock member, and work can be carried out safely over a long period of time without changing the operating feel of the operating lever. In addition, since the control lever is retracted in a direction away from the driver's seat and in a direction that widens the path for the driver to get on and off the vehicle, the risk of the driver's body coming into contact with the control lever is further reduced, making boarding and alighting easier. Became.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 7 shows a backhoe which is an example of a working vehicle according to the present invention. This backhoe has a swivel base (1) mounted on the traveling body that can rotate freely around the vertical axis, an excavation work device (2) attached to the swivel base (1), and a driving unit (3) mounted on the top. It is arranged.

The excavation work device (2) includes a swing bracket (4)
The boom (8), arm (9), and packet (10
), this excavation work equipment (2) and a swivel table (1)
The driving operation is performed by controlling a hydraulic control valve (not shown) by operating an operating lever (12) disposed on the side of the driver's seat (11).

Next, the structure of the mounting portion of the operating lever (12) will be explained.

As shown in FIGS. 1 to 5, the operating lever (1
2) is the front-back axis (Xl) and the left-right axis (Yl).
), and the lever support member (13) is supported by a lever support member (13) so as to be swingable around the lower axis (
) is attached to the fuselage side so that it can swing freely between an operating position operating lever (12) located at the front side of the lever (12) and a lever retracted position in which it is retracted and tilted outward to the rear side. In detail, the operation lever (1
The support bracket (15) is attached and fixed to the lever case (14), which is a member on the machine body that surrounds the proximal end of The lever support member (
13) is pivotally supported by a pin (16), and the lever support member (
The vertical cylinder boss part (17) integrally formed with the lever pivot support member (18) is fitted inside the vertical cylinder boss part (17) to rotatably support the lever pivot support member (18). The lever pivot member (18) supports the first rotating member (21) rotatably around the longitudinal axis (Yl) via the bearing (20), and also supports the first rotating member (21 ), the second rotating member (22) is attached so as to be relatively rotatable around the left and right axis (Yl). Said second
Via a relatively rotatable ball joint (23) on the front-back axis (X,) of the rotating member (22) and at a position eccentrically forward from the left-right axis (Y,) While linking the first operating wire (24), the second rotating member (22)
The second operating wire (26) is connected via a ball joint (25) that is relatively rotatable on the left-right axis (Yl) and at a position eccentrically inward from the front-rear axis (Xl). The operating wires (24) and (26) are linked to a hydraulic control valve (not shown) to be operated.

In this way, by swinging the operating lever (12) back and forth from the neutral position, only the first operating wire (24) can be operated, and by swinging it left and right, only the second operating wire (26) can be operated. It is. Further, the lever pivot member (18) is configured to support both the first rotating member (21) and the second rotating member (22) in a cantilevered manner.

A lever locking member (27) for locking the operating lever (12) at a neutral position is located at an operating position protruding outward from the front side of the lever case (14) and close to the front surface of the lever case (14). It is provided so that it can be freely switched between the released position and the released position. Specifically, the horizontal support shaft (28) on the proximal end side of the lever lock member (27) is inserted into and supported by a boss part (29) fixed to the lower surface of the support bracket (15). 29) and horizontal support shaft (28
) A position-holding coil spring (30) is interposed between the two. Then, as the lever lock member (27) is operated from the release position to the operating position, the lever support member (27) is moved from the release position to the operating position.
13) is provided with an interlocking mechanism for repositioning it to an outward rearward tilting position. That is, the L-shaped drive arm (31) is connected to the middle part of the horizontal support shaft (28), and the slide rod (32) is slidably inserted into the vertical cylinder part (19) of the lever pivot support member (18). ) is fitted inside, and the free end side of the drive arm (31) is engaged with the elongated hole (34) of the plate-like part (33) connected to the lower end of the slide rod (32). In other words, the slide rod (32) slides up and down in conjunction with the switching swing of the lever lock member (27), and when it slides to the upper end, the upper part is moved to the second position.
It is configured to engage an engagement hole (35) formed in the lower part of the rotating member (22) to restrict the swinging of the operating lever (12) and lock it in the neutral position.

Then, the slide rod (32) is inserted into the engagement hole (3).
5) From the lock position where the lever lock member (
27) to the locking position, the tip of the slide rod (32) comes into contact with the lower surface of the first rotating member (21) and pushes it up, causing the first and second rotating members ( 21
), (22) The lever pivot support member (18) and the lever support member (13) integrally tilt laterally outward and rearward around the diagonal axis (X2).

In the tilted state, the position is maintained by the pressing friction force of the coil spring (30). As a result, the operating lever (12) can be prevented from swinging outward and becoming an obstacle when the driver gets on and off the vehicle.

The drive arm (31) and the slide rod (32) constitute the linkage mechanism.

Further, a hook portion (36) is provided on the other end side of the horizontal support shaft (28) that rotates together with the lever lock member (27), so that the hook portion (36) can be returned to the operating position when the lever neutral lock is released. Locking pin (37) of lever support member (13)
The hook portion (36) engages with the lever support member (
13) is configured to be fixed in the operating position, and consideration is given to preventing the operating lever (12) from wobbling.

Note that the present invention is applicable not only to backhoes but also to various work vehicles such as front loader work vehicles and agricultural vehicles such as combines.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

The drawings show an embodiment of the structure of the lever attachment part of a working vehicle according to the present invention, and FIG. 1 is a cross-sectional plan view of the lever support member installation part;
2 and 4 are vertical side views, FIGS. 3 and 5 are vertical rear views, FIG. 6 is a cross-sectional plan view of the operating wire linking section, and FIG. 7 is an overall side view of the backhoe. (11)... Driver's seat, (12)...
Operation lever, (13)... Lever support member, (
24), (26)... operation wire, (27)
・・・・・・Lever lock member, (X2)・・・・・・
Axial core.

Claims (1)

[Claims] An operating lever (12) is disposed on the side of the driver's seat (11), and the operating lever (12) is supported by a lever support member (13) so as to be swingable for operation.
12) is provided with a lever locking member (27) that locks the operating lever (12) at a predetermined operating position and is operable to release the lock, the operating lever (12)
and the object to be operated are interlocked and linked via the operation wires (24) and (26), and the lever support member (13)
), the operating lever (12) is connected to the driver's seat (11).
attached to the fuselage side so as to be able to freely switch and swing around the lower axis (X_2) between an operating position located at the front side of the lever and a lever retracted position where the operating lever (12) is retracted and tilted to the rear and outward side; A lever mounting part of a working vehicle, which is provided with a linkage mechanism that changes the position of the lever support member (13) to the lever retracted position when the lever lock member (27) is operated from the unlock position to the lock action position. structure.