JP2524580Y2 - Work vehicle tilt handle structure - Google Patents

Description

[Detailed description of the invention] [Industrial application field] In the invention, the steering handle is configured to be swingable in the longitudinal direction of the aircraft within a predetermined range around the left-right axis, and the handle can be held at a set position. The present invention relates to a tilt handle structure of a working vehicle provided with a simple lock device.

[Conventional technology]

The conventional tilt handle structure of the work vehicle is actually open
As shown in Japanese Patent Application Laid-Open No. 62-129368, a handle post supporting a steering handle is pivotally connected to the fuselage side via a downwardly open U-shaped bracket, and a mesh type locking device is provided. Was composed.

[Problems to be solved by the invention]

In the prior art, the lock device merely has a function of restricting forward and backward swing of the handle,
Supporting the handle post with sufficient strength without rattling in the left-right direction is performed only by the pivotal connection portion by the U-shaped bracket.

As a result, a lock device that requires more parts than a pivotal connection portion, which is an important component for supporting the handle, such as a meshing engagement portion, a return spring, and a lock lever, has a function of There is a sense of cost and it seems that there is room for improvement in the tilt handle structure of the work vehicle.

It is an object of the present invention to make the tilt handle structure of a working vehicle more rational based on the above situation.

[Means for solving the problem]

In order to achieve the above object, a feature of the present invention is to provide a locking device which is configured to be able to swing in the longitudinal direction of the aircraft within a predetermined range around the left-right axis and to hold the steering wheel at a set position. In the tilt handle structure of a working vehicle provided, a handle post for supporting the steering handle is pivotally connected to a cradle on the body side at the left and right axis, and the handle post and the handle post are located at positions other than the left and right axis. The locking device is configured by providing a tightening press-contact mechanism that can relatively fix and relatively press the receiving table in the left-right direction, and further includes a male screw member on the handle post side in the tightening press-contact mechanism. Further, a male screw body is provided on the receiving table side in a posture along an opposing surface between the handle post and the receiving table, and a tightening by the tightening press-contact mechanism is performed. Lies in that the outer peripheral surface each other having a threaded portion of the male screw member and the male threaded body are mounted in a state of being contact with the.

[Action]

According to the above configuration, when the tightening and pressing mechanism is operated to hold the handle position by the lock device, the male screw member mounted on the handle post side and the male screw body mounted on the receiving table side are relatively moved in the left-right direction. Becoming pressed,
At the same time, the front and rear movement of the handle post and the cradle is prevented, and the left and right pressing force caused by the tightening makes it possible to lock in an integrated state in which the handle post and the pedestal do not move relative to each other in the left and right direction, and further in the up and down direction. Also in the lock device, the function as a connecting device having the strength for fixing and supporting the handle post to the receiving table is exhibited.

That is, it is possible to connect and support the handle post and the cradle in a state where the handle post and the cradle are strong by both the pivotal connection portion at the left and right axes for tilting the steering handle and the locking device portion.

Also, a male screw member and a male screw body having irregularities are attached to the handle post side or the pedestal side, and the relative movement of the handle post and the cradle relative to each other by the relative pressure contact between the male screw member and the male screw body. In comparison to the case where unevenness is formed directly on both the pressure contact surfaces on the handle post side and the pedestal side, and the relative back-and-forth movement between the handle post and the pedestal is prevented by pressing the irregularities. do it,
A structure for preventing the handle from swinging back and forth by pressing the unevenness between the handle post side and the receiving stand side can be easily configured.

[Effect of the invention]

Therefore, the locking device can also be provided with a handle post support function while simplifying the structure, so that it is possible to easily obtain a support structure that can more reliably and firmly support the steering handle as compared with the related art. For example, the pivot connection portion is provided only on one side of the handle shaft so that the structure of the pivot connection portion can be simplified and the cost can be reduced. Could be streamlined.

〔Example〕

Hereinafter, a case where the present invention is applied to a tractor as an example of a work vehicle will be described with reference to the drawings.

FIG. 4 shows the agricultural tractor according to the present invention. This agricultural tractor is configured as a monobody type in which an engine (1), a clutch housing (2), an intermediate transmission case (3), and a transmission case (4) are connected and arranged in this order from the front to the rear of the aircraft. Control unit (B) with driver's seat (5) above transmission case (4)
Also, a hydraulic lift arm (6) for lifting and lowering the work equipment and a PTO for driving the work equipment are provided at the rear of the transmission case (4).
An axis (A) is provided.

Step (9) in the control section (B) of this tractor
A control tower (8) for supporting a steering handle (7) is mounted on a panel frame (10) fixed to the front end of the step (9).

In this tractor, the steering device (7) is configured to be swingable in the longitudinal direction of the vehicle within a predetermined range around the left-right axis (P), and a locking device (L) capable of holding the steering device (7) at a set position. ) Is provided in the tilt structure, which will be described below.

As shown in FIGS. 1 to 3, the control tower (8) includes a handle post (1) supporting a steering handle (7).
1) is pivotally connected to the cradle (12) on the fuselage side at the left and right axis (P), and an operation panel (13) with various instruments is arranged above the cradle (12). I have.

The handle post (11) is composed of a support pipe (15) for rotatably supporting an upper handle shaft (14) on which the handle (7) is mounted, a post cover (16), and the like. Z-shaped mounting plate (1
The lower end of 7) is pivotally connected to the left plate (12a) of the pedestal (12) at the left and right axis (P), and the upper end (17a) of the mounting plate (17) and the right of the pedestal (12). A tightening press-contact mechanism (C) extending over the plate (12b) is formed.

That is, an arc-shaped long hole (18) centering on the left and right axis (P) is formed in the right plate (12b), and a male screw member (19) is depressed and fixed above the long hole (18). At the same time, a guide rod (20) is fixed to the right plate (12b) on the lower side, and each of them is directed in a direction along the longitudinal direction of the long hole (18).

A U-shaped pressure contact plate (21) guided by the bent upper end of the right plate (12b) and the guide bar (20) is inserted into a stepped bolt-shaped rotation shaft (22), and the rotation shaft ( 22) the slot (18)
And screwed and fixed to the mounting plate (17), and a male screw body (23) which can be engaged with the male screw member (19) is depressed and fixed to the inner side surface of the pressing plate (21). Spring (2) for urging the 21) away from the right plate (12b)
4) is externally fitted to the rotating shaft (22) to constitute a tightening press-contact mechanism (C).

A lock lever (25) is attached to the head of the rotating shaft (22).
A boss (26) provided with a left-hand thread is fitted with the boss (26), and these constitute a lock device (L).

The upper handle shaft (14) and the lower handle shaft (27) are connected to a universal joint (28) at the left and right axis (P).

A forward / reverse switching cover (29) is supported on the left side of the handle post (11). The lever support shaft (30) supports the upper surface of the handle post (11) in a spherical shape, and the left and right axes (P) In the lower position, the base lever support shaft (31) is connected by a universal joint (32), and the lower joint portion (32a) and the base lever support shaft (31) can be moved in the axial direction. Spline fitted.

(33) is a direction indicating lever, and (34) is a handle accelerator lever.

Next, the operation of the tilt structure will be described. When the lock lever (25) is swung upward, the left screw is loosened and the boss (26) moves outward from the fuselage. (21) is pushed to disengage the male screw member (19) from the male screw body (23), and the rotating shaft (22) and the right plate (12b)
And the handle post (11), that is, the steering handle (7), can be pivoted back and forth (tilt) around the left and right axis (P) (FIG. 2).

Then, at a predetermined swing position, the lock lever (2
When the 5) is swung downward and pushed down, the left screw is tightened, the boss (26) moves toward the inside of the machine with respect to the rotating shaft (22), and the mounting plate (17) is opposed to the spring (24). The right plate (12b) is pressed against the pressure contact plate (21) and the male screw member (19) engages with the male screw body (23), so that the handle post (11) swings back and forth. And the tilt is fixed.

(Another embodiment)

The pivotal connection between the handle post (11) and the pedestal (12) at the left and right axis (P) may be provided on both sides of the handle shaft (14). Further, the present invention may be applied to a transport vehicle.

Note that, in the claims of the utility model registration, reference numerals are written for convenience of comparison with the drawings, but the present invention is not limited to the structure of the attached drawings by the entry.

[Brief description of the drawings]

Drawings show an embodiment of a tilt handle structure of a work vehicle according to the present invention, FIG. 1 is a partially cutaway rear view showing the structure, FIG. 2 is a partially cutaway side view showing a structure near a handlebar, FIG. 3 is an exploded perspective view showing the lock device, and FIG. 4 is a side view of the tractor. (7) Steering handle, (11) Handle post, (12) Cradle, (19) Male screw member, (2)
3)… male screw body, (P)… left and right axis, (L)… locking device, (C)… tightening pressure contact mechanism.

Claims (1)

(57) [Scope of request for utility model registration] A lock device capable of swinging a steering handle (7) in a longitudinal direction within a predetermined range around a left-right axis (P) and holding the handle (7) at a set position. L), wherein the handle post (11) for supporting the steering handle (7) is pivotally mounted on the pedestal (12) on the machine body side at the left-right axis (P). At the position other than the left and right axis (P), the handle post (11) and the pedestal (12) are pressed against each other in the left and right direction at a position other than the left and right axis (P). The locking device (L) is provided to further provide the male screw member (19) on the handle post (11) side and the pedestal (12) side on the tightening press-contact mechanism (C). Male screw body (23)
The handle post (11) and the cradle (12), respectively.
The outer peripheral surfaces having the threaded portions of the male screw member (19) and the male screw body (23) in the posture along the surface facing the screw member and with the tightening by the tightening pressure contact mechanism (C). The tilt handle structure of the work vehicle that is mounted in a contact state.