TECHNICAL FIELD
[0001]
The present invention relates to an operation device of a work
vehicle provided with an up/down lever for selectively switching a
working state in which a work device is positioned at a control
target height set by a position lever and a non-working state in
which the work device is positioned above the control target height.
BACKGROUND ART
[0002]
Patent Literature 1 discloses an operation device of a work
vehicle provided with, as operation levers related to a work device
(for example, tilling device), a position lever for setting a
control target height of the work device, a sensitivity adjustment
lever for adjusting up/down sensitivity of the work device, and an
up/down lever.
[0003]
In order for a worker to switch the working state and the nonworking state by operating the position lever, an operation stroke
of the position lever tends to be long, and it is usually
troublesome for the worker. In addition, if movement between a
working region and a non-working region is made many times, there
is a possibility that a control target height cannot be equalized.
[0004]
By operating the up/down lever, the worker selectively
switches the working state, in which the work device is positioned
at the control target height set by the position lever, and the
non-working state, in which the work device is positioned above the
control target height. When the work vehicle is to move from the
working region in which work by the work device is carried out to
the non-working region in which work by the work device is not
carried out, the worker carries out switching to the non-working
state by operating the up/down lever. On the other hand, after
movement from the non-working region to the working region is made,
the worker selectively switches the non-working state to the working
state by operating the up/down lever. Even when movement between
the working region and the non-working region is made many times,
the worker can easily switch the working state and the non-working
state by operating the up/down lever.
CITATION LIST
3
PATENT LITERATURE
[0005]
Patent Literature 1: JP 2005-185107 A
SUMMARY OF INVENTION
TECHNICAL PROBLEM
[0006]
The worker operates the work device by using the operation
levers related to the work device while driving the work vehicle.
Therefore, there has been room for improvement about operability of
the operation levers related to the work device in consideration of
driving of the work vehicle.
[0007]
Therefore, it is an object to provide an operation device of
a work vehicle capable of improving operability of operation levers
related to a work device, wherein the operation device is an
operation device of the work vehicle provided with an up/down lever
for selectively switching a working state in which the work device
is positioned at a control target height set by a position lever
and a non-working state in which the work device is positioned above
the control target height.
SOLUTION TO PROBLEM
[0008]
An operation device of a work vehicle according to an aspect
includes: a position lever for setting a height of the work device;
a sensitivity adjustment lever for adjusting up/down sensitivity of
the work device; and an up/down lever for selectively switching a
working state and a non-working state, the working state being a
state that the work device is positioned at the height set by the
position lever, the non-working state being a state that the work
device is positioned above the set height. The up/down lever is
disposed in rear with respect to the position lever and the
sensitivity adjustment lever.
BRIEF DESCRIPTION OF DRAWINGS
[0009]
Fig. 1 is a right side view of a work vehicle according to an
embodiment.
Fig. 2 is a right side view of an operation device according
to the embodiment.
Fig. 3 is a perspective view (number 1) viewed from an upper
left front side of the operation device according to the embodiment.
Fig. 4 is an enlarged perspective view of part of the
operation device according to the embodiment viewed from an upper
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left rear side.
Fig. 5 is a perspective view (number 2) viewed from an upper
left front side of the operation device according to the embodiment.
Fig. 6 is a top view of the operation device according to the
embodiment.
Fig. 7 illustrates explanatory diagrams for describing
movement of the operation device according to the embodiment.
Fig. 8 is a right side view of an operation device according
to Modification Example 1.
Fig. 9 is a perspective view (number 1) of the operation
device according to Modification Example 1 viewed from an upper
left front side.
Fig. 10 is a perspective view (number 2) of the operation
device according to Modification Example 1 viewed from an upper
left front side.

We claim,
1. An operation device of a work vehicle comprising:
a position lever for setting a height of the work device;
a sensitivity adjustment lever for adjusting up/down
sensitivity of the work device; and
an up/down lever for selectively switching a working state
and a non-working state, the working state being a state that the
work device is positioned at the height set by the position lever,
the non-working state being a state that the work device is
positioned above the set height, wherein
the up/down lever is disposed in rear with respect to the
position lever and the sensitivity adjustment lever.
2. The operation device of the work vehicle according to claim
1, wherein
the up/down lever is disposed in an inner side in a width
direction of the work vehicle, the inner side being with respect to
a rollover protective frame provided to protect a worker when the
work vehicle rolls over.
3. The operation device of the work vehicle according to claim
1 or 2, further comprising:
a roller portion; and
a contact member that relatively moves with respect to the
roller portion while in contact with the roller portion, wherein
the working state and the non-working state are mutually
switched when the up/down lever moves in a front-rear direction of
the work vehicle,
the roller portion or the contact member moves in the frontrear direction in response to the movement of the up/down lever in
the front-rear direction,
one of the roller portion and the contact member is biased
toward the other one of the roller portion and the contact member,
and
the contact member has a contact surface that moves the roller
portion in a vertical direction of the work vehicle while relatively
moving the roller portion with respect to the contact member in the
front-rear direction.
4. The operation device of the work vehicle according to claim
3, wherein
the contact surface has:
a part projecting toward the roller portion in the
vertical direction; and
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parts in both sides of the projecting part in the frontrear direction, the parts being recessed with respect to the roller
portion.
5. The operation device of the work vehicle according to any one
of claims 1 to 4, wherein
the working state and the non-working state are mutually
switched when the up/down lever moves in the front-rear direction
of the work vehicle,
the operation device further comprises an up/down guide plate
that has an up/down guide hole and guides the up/down lever, the
up/down lever being inserted in the up/down guide hole,
the up/down guide hole has:
a first hole portion that is extending in the frontrear direction and guides the movement of the up/down lever in the
front-rear direction for mutually switching the working state and
the non-working state; and
a second hole portion that is extending in a width
direction of the work vehicle from a one end portion of the first
hole portion in the front-rear direction and guides movement of the
up/down lever in the width direction for maintaining the non-working
state.
6. The operation device of the work vehicle according to claim
5, wherein
the second hole portion is extending toward outside in the
width direction from the one end portion of the first hole portion
in the front-rear direction, and
the operation device further comprises a first biasing member
that biases the up/down lever toward outside in the width direction,
the up/down lever being positioned in the second hole portion.
7. The operation device of the work vehicle according to claim
5 or 6, wherein
the up/down guide hole has a third hole portion that is
extending toward outside in the width direction of the work vehicle
from another end portion of the first hole portion in the frontrear direction and guides the movement of the up/down lever in the
width direction for maintaining the working state, and
the operation device further comprises a first biasing member
that biases the up/down lever toward outside in the width direction,
the up/down lever being positioned in the third hole portion.
8. The operation device of the work vehicle according to any one
of claims 1 to 7, further comprising a restriction member that
33
restricts movement of the up/down lever for maintaining the working
state.
9. The operation device of the work vehicle according to any one
of claims 1 to 8, wherein
the up/down lever is disposed between the position lever and
the sensitivity adjustment lever in the width direction of the work
vehicle.
10. The operation device of the work vehicle according to claim
6 or 7, further comprising:
a feedback mechanism of a hydraulic cylinder; and
a second biasing member that biases the up/down lever in a
direction that gets away from a neutral position of a spool of the
hydraulic cylinder in the front-rear direction, the up/down lever
being positioned in the first hole portion.