Patent Description:
As a riding grass mowing machine as an example of a work vehicle, as disclosed in Patent Document <NUM>, there is known one in which a grass collecting section (corresponding to an "implement") is supported to a rear portion of the machine body. In this, cut grass pieces cut by a mower mounted to the machine body are sent to the grass collecting section to be stored therein. And, at the time of e.g. a maintenance operation, the grass collecting section can be detached from the machine body.

Patent Document <NUM>: <CIT>
<CIT> discloses a lawn sweeper coupled to a tractor.

With such riding grass mowing machine, an electrical unit such as a fullness sensor for detecting fullness of the grass collecting section being full of grass (cut grass pieces) therein may sometimes be provided in this grass collecting section. And, a harness extended from the electrical unit is extended to the machine body to be connected to e.g. a control device provided in this machine body.

In this case, if the grass collecting section is configured to be detachable from the machine body as described above, the harness extending between the grass collecting section and the machine body needs to be provided with a harness separation arrangement using a coupler. So, consideration should be made on the water resistance and dust resistance properties of the coupler when separated.

For such work vehicle having an implement configured to be attachable to and detachable from a machine body, the object of the present invention is to appropriately configure the harness separation arrangement using a coupler in case the harness is provided between the implement and the machine body.

A work vehicle according to the present invention comprises:.

With the present invention described above, under a condition of the implement being attached to the machine body, a worker will keep the implement side coupler and the machine body side coupler connected to each other.

By attaching the cap which is used when the implement is detached from the machine body to the coupler holding portion, the worker will have not much trouble in storage of the cap and accidental loss of the cap will hardly occur. And, thanks to the cap, adhesion of water, dust or the like to the coupler holding portion can be prevented.

When the implement is to be detached from the machine body, if e.g. the coupler holding portion is provided in the implement, the worker can simply separate the implement side coupler from the machine body side coupler and detach the cap from the coupler holding portion of the implement and then attach it to the machine body side coupler and attach the implement coupler to the coupler holding portion of the implement.

On the other hand, when the implement is to be detached from the machine body, if e.g. the coupler holding portion is provided in the machine body, the worker can separate the implement side coupler from the machine body side coupler and detach the cap from the coupler holding portion of the machine body and then attach it to the implement side coupler and attach the machine body side coupler to the coupler holding portion of the machine body.

With execution of the above-described operations, the implement can be smoothly and easily detached from the machine body.

And, as the cap is attached to the machine body side (implement side) coupler, adhesion of water, dust or the like to the machine body side (implement side) coupler can be prevented.

As the implement side (machine body side) coupler is attached to the coupler holding portion, adhesion of water, dust or the like to the implement side (machine body side) coupler can be prevented.

When the implement is attached to the machine body, the cap is attached to the coupler holing portion, thus preventing adhesion of water, dust or the like to the coupler holding portion. Therefore, it is possible to avoid attachment of the implement side (machine body side) coupler to the coupler holding portion to which water, dust or the like has adhered.

In contrast to the present invention described above, it is conceivable to arrange such that when the implement side coupler and the machine body side coupler were separated from each other, a cap is attached to the implement side coupler and another cap is attached to the machine body side coupler. With this arrangement, at least two caps are needed for the one set of implement side harness and the machine body side harness.

On the other hand, in the case of the present invention, as described above, a coupler holding portion capable of holding the implement side coupler or the machine body side coupler is provided in ether the implement or the machine body. Thus, the number of the couplers is reduced and accidental loss of the cap(s) can be prevented.

And, since the coupler holding portion has two functions, namely, a function of holding the implement side coupler or the machine body side coupler and another function of holding the cap. Thus, the inventive arrangement is advantageous for simplification of the arrangement.

In the present invention, preferably, the coupler holding portion is provided in the implement and the non-working state can be set in which the implement side coupler is attached to the coupler holding portion of the implement and the cap is attached to the machine body side coupler.

With the invention described above, the coupler holding portion is provided in the implement. When the implement is to be detached from the machine body, the worker will separate the implement side coupler from the machine body side coupler and detach the cap from the coupler holding portion and then attach it to the machine body side coupler and attach the implement side coupler to the coupler holding portion.

With the present invention, in the implement which has been detached from the machine body, the implement side coupler is held by the coupler holding portion of the implement. Thus, the implement side harness can be supported to the implement in a stable manner.

In case various kinds of implements are supposed to be attached to the machine body, according to the present invention, in comparison with an arrangement of the coupler holding portion being provided in the machine body, the coupler holding portion can be readily adapted for use with the implement, for such various kinds of implements respectively.

In the present invention, preferably, the machine body side coupler is provided in a support member provided in the machine body.

With the present invention described above, when the implement side coupler and the machine body side coupler have been separated from each other, since the machine body side coupler is attached to a support member provided in the machine body, the machine body side coupler can be supported to the machine body in a stable manner.

In the present invention, preferably, when the implement is attached to the machine body, a connecting direction to the machine body side coupler by the implement side coupler is set different from an inserting direction to the coupler holding portion by the implement side coupler.

In case the implement which was detached previously from the machine body has now been attached to the machine body, the worker will detach the implement side coupler from the coupler holding portion and then connect it to the machine body side coupler.

In this case, under the condition of the implement being attached to the machine body, if the connecting direction to the machine body side coupler by the implement side coupler were set same as the inserting direction to the coupler holding portion by the implement side coupler, the worker might erroneously attach the implement side coupler to the coupler holding portion of the implement again, after once detaching this implement side coupler from the coupler holding portion of the implement.

With the present invention described above, when the implement is attached to the machine body, the connecting direction to the machine body side coupler by the implement side coupler is set different from the inserting direction to the coupler holding portion by the implement side coupler.

With the above, even if the worker may attempt an erroneous operation of reattaching the implement side coupler to the coupler holding portion of the implement after having detached the former from the latter, thanks to the difference set between the connecting direction and the inserting direction described above, the worker will readily take notice of the contemplated operation being erroneous. As a result, the erroneous operation of reattaching the implement side coupler to the coupler holding portion of the implement after having once detached the former from the latter can be lessened.

<FIG> show a mid-mount riding type grass mowing machine as one example of a "work vehicle". In <FIG>, a sign "F" denotes the front direction, a sign "B" denotes a rear (back) direction, a sign "U" denotes the upper direction, a sign "D" denotes the downward direction, a sign "R" denotes the right direction and a sign "L" denotes the left direction, respectively.

As shown in <FIG>, right and left front wheels <NUM> and right and left rear wheels <NUM> together support a machine body frame <NUM> (corresponding to a "machine body"), and a mower <NUM> is disposed between the front wheels <NUM> and the rear wheels <NUM> and supported to the machine body frame <NUM>.

An engine <NUM> is supported to a front portion of the machine body frame <NUM> and a driver's seat <NUM> is supported to a rear portion of the machine body frame <NUM>. At a position forwardly of the driver's seat <NUM>, there is supported a steering wheel <NUM> for steering the front wheels <NUM>.

As shown in <FIG>, a ROPS frame <NUM> (corresponding also to the "machine body") is coupled to the machine body frame <NUM> to be disposed rearwardly of the driver's seat <NUM> as seen in a side view. The ROPS frame <NUM> includes right and left struts 8a coupled to rear portions of the machine body frame <NUM> and extending upwards, an arch portion 8b connected to and between upper portions of the right and left struts 8a, and a side frame 8c and a side frame 8d (both corresponding to a "support member") coupled to and between vertically intermediate portions of the right and left struts 8a of the ROPS frame <NUM>.

From a left/right center portion of the mower <NUM>, a duct <NUM> is extended obliquely upwards on the rear side, and the duct <NUM> is disposed between the right and left rear wheels <NUM> and between the right and left struts 8a of the ROPS frame <NUM> and is disposed also downwardly of the driver's seat <NUM>.

A grass collecting section <NUM> (corresponding to an "implement") is provided to be attachable to and detachable from the right and left struts 8a of the ROPS frame <NUM>. A control valve unit <NUM> (corresponding also to the "implement") for feeding/discharging work oil to/from a grass collecting section <NUM> is provided to be attachable to and detachable from the side frame 8c of the ROPS frame <NUM>.

As shown in <FIG> and <FIG>, the grass collecting section <NUM> includes a grass collecting container <NUM>, right and left upper links <NUM>, right and left lower links <NUM>, right and left support brackets <NUM>, right and left hydraulic cylinders <NUM>, <NUM>, a fullness sensor <NUM> (corresponding to an "electrical unit"), etc..

The grass collecting container <NUM> is configured as a box-like member, with attachment of a wall face constituted of such a member as an air-permeable mesh or the like having air permeability to a box-like frame. The fullness sensor <NUM> is provided at a front lower portion inside the grass collecting container <NUM> and configured to detect a movement of a movable contact plate (not shown).

Leading ends of the upper links <NUM> and the lower links <NUM> are placed in contact with a right rear portion and a left rear portion of the grass collecting container <NUM>. Between and to base portions of the right upper link <NUM> and the right lower link <NUM>, the right support bracket <NUM> is connected, and between and to base portions of the left upper link <NUM> and the left lower link <NUM>, the left support bracket <NUM> is connected.

The right and left hydraulic cylinders <NUM> are connected to and between the right and left lower links <NUM> and the right and left support brackets <NUM> of the grass collecting section <NUM>. The right and left hydraulic cylinders <NUM> are provided at the connecting portions between the upper links <NUM>, the lower links <NUM> and the grass collecting container <NUM>.

The condition shown in <FIG> is a condition in which the grass collecting section <NUM> is detached from the riding grass mowing machine. As shown from <FIG>, as the right and left support brackets <NUM> are coupled to the right and left struts 8a of the ROPS frame <NUM>, the grass collecting section <NUM> is attached to the ROPS frame <NUM> (riding grass mowing machine).

Under the condition of the grass collecting section <NUM> being attached to the ROPS frame <NUM>, the rear portion of the duct <NUM> will be inserted to a front portion of the grass collecting container <NUM>. When a grass cutting (mowing) work is carried out, grass pieces cut by the mower <NUM> will be conveyed through the duct <NUM> to be charged into the grass collecting container.

When the cut grass pieces cut by the mower <NUM> are to be charged into the grass collecting container <NUM>, these grass pieces will firstly be deposited at a rear lower portion of the inside of the grass collecting container <NUM>. In association with progressive charging of the grass pieces, the position of the cut grass pieces inside the grass collecting container <NUM> will move to the forward side. And, when the grass pieces inside the grass collecting container <NUM> reach a position in contact with the fullness sensor <NUM>, it is determined that the grass collecting container <NUM> has reached fullness.

When the hydraulic cylinders <NUM> are expanded from the state thereof shown in <FIG>, the upper and lower links <NUM>, <NUM> will be elevated, whereby the grass collecting container <NUM>, while kept under the posture thereof shown in <FIG>, will be elevated.

Then, under this elevated state of the grass collecting container <NUM>, if the hydraulic cylinders <NUM> are expanded, the grass collecting container <NUM> will be pivoted clockwise in <FIG>, about the connecting portions with the upper and lower links <NUM>, <NUM>, acting as a "pivot", so that the front portion of the grass collecting container <NUM> will be oriented downwards, thus allowing discharge (dumping) of the cut grass pieces of the grass collecting container <NUM> onto the ground surface.

The control valve unit <NUM> is provided with a plurality of electromagnetic control valves (corresponding to the "electrical unit") (not shown) for carrying out feeding/discharging operations of the work oil to/from the hydraulic cylinders <NUM>, <NUM>.

As shown in <FIG>, the side frames 8c, 8d of the ROPS frame <NUM> are located on the lateral sides of the driver's seat <NUM> as seen in the side view and a support bracket <NUM> is coupled and bound between the right strut 8a and the right end portion of the side frame 8c of the ROPS frame <NUM>.

The control valve unit <NUM> is attached to the support bracket <NUM> via an attaching pin <NUM> and is attached to the ROPS frame <NUM> via the support bracket <NUM>. By detachment of the attaching pin <NUM> from the support bracket <NUM>, the control valve unit <NUM> is detached from the ROPS frame <NUM>.

As shown in <FIG> and <FIG>, under the condition of the control valve unit <NUM> is attached to the ROPS frame <NUM>, the control unit <NUM> is disposed at substantially same height as the seat portion of the driver's seat <NUM> as seen in the side view and disposed also rearwardly of the seat portion of the driver's seat <NUM> and is disposed on the right side of the driver's seat <NUM> as seen in a front view (rear view) and is also disposed upwardly of a fender <NUM> covering the upper side of the right rear wheel <NUM>.

A cover <NUM> made of synthetic resin is provided and this cover <NUM> is attached to a front portion of the control valve unit <NUM> in such a manner as to cover the front face portion of the control valve unit <NUM>.

As shown in <FIG>, a support bracket <NUM> is coupled to an upper face portion of the duct <NUM> and feeding and discharging hydraulic hoses <NUM> are connected to the support bracket <NUM>, and work oil of a hydraulic pump (not shown) driven by power of the engine <NUM> is fed to the feeding hydraulic hose <NUM>.

As shown in <FIG>, feeding and discharging hydraulic hoses <NUM> are extended from the control valve unit <NUM> and these hydraulic hoses <NUM> are connected to the respective hydraulic hoses <NUM> via work oil couplers <NUM>. Further, a plurality of hydraulic hoses <NUM> are extended from the control valve unit <NUM> and these hydraulic hoses <NUM> are connected to the hydraulic cylinders <NUM>, <NUM>.

With the above-described arrangements, in operation, the work oil of the hydraulic pump is fed/discharged via the control valve unit <NUM> to/from the hydraulic cylinders <NUM>, <NUM> to expand/contract the hydraulic cylinders <NUM>, <NUM>.

As shown in <FIG>, <FIG> and <FIG>, a water-proof type machine body side harness <NUM> is extended to the side frame 8d of the ROPS frame <NUM> and a water-proof type coupler <NUM> is connected to an end portion of a machine body side harness <NUM>. The coupler <NUM> of the machine side harness <NUM> is attached to the side frame 8d of the ROPS frame <NUM> to be disposed downwardly of the control valve unit <NUM> as seen in the front view.

As shown in <FIG>, in the coupler <NUM> of the machine body side harness <NUM>, an upper portion 29a, two side (lateral) portions 29b and a lower portion 29c are formed in continuation thus forming a cylindrical body. And, this coupler <NUM> of the machine body side harness <NUM> is formed of synthetic resin.

At the lower portion 29c of the coupler <NUM> of the machine body side harness <NUM>, there is formed a recess portion 29d having a channel-like cross section and bulging downwards. And, at opposed ends of the entrance of this recess portion 29d, a pair of protruding portions 29e are formed.

As shown in <FIG>, <FIG> and <FIG>, a water-proof type implement side harness <NUM> is extended from the control valve unit <NUM> and a water-proof type coupler <NUM> is connected to the end portion of the implement side coupler <NUM>.

As shown in <FIG>, in the coupler <NUM> of the implement side harness <NUM>, there are formed a body portion 31a having a same outer shape as the inner faces of the upper portion 29a, the side portions 29b and the lower portion 29c of the coupler <NUM> (see <FIG>) of the machine body side harness <NUM>, a longitudinally elongate protruding portion 31b provided at the lower face portion of the body portion 31a and protruding portions 31c provided at opposed side (lateral) portions of the protruding portion 31b, and the coupler <NUM> of the implement side harness <NUM> is formed of synthetic resin.

As shown in <FIG>, <FIG>, the implement side coupler <NUM> of the implement side harness <NUM> will be inserted into the coupler <NUM> of the machine body side harness <NUM> in such a manner that the protruding portions 31b, 31c of the coupler <NUM> of the implement side harness <NUM> are fitted into the recess portion 29d of the coupler <NUM> of the machine body side harness <NUM>. With this, connection is established between the coupler <NUM> of the implement side harness <NUM> and the coupler <NUM> of the machine body side harness <NUM>.

In the course of the above process, the protruding portion 31c of the coupler <NUM> of the implement side harness <NUM> and the protruding portion 29e of the coupler <NUM> of the machine body side harness <NUM> are elastically deformed and the protruding portion 31c of the coupler <NUM> of the implement side harness <NUM> rides over the protruding portion 29e of the coupler <NUM> of the machine body side harness <NUM> and engagement is established between the protruding portion 31c of the coupler <NUM> of the implement side harness <NUM> and the protruding portion 29e of the coupler <NUM> of the machine body side harness <NUM>. With this, the connection between the coupler <NUM> of the implement side harness <NUM> and the coupler <NUM> of the machine body side harness <NUM> is maintained.

As shown in <FIG>, the implement side harness <NUM> is bifurcated into two branches, and a water-proof type coupler <NUM> is connected to an end portion of one branch of the implement side harness <NUM> and this coupler <NUM> is connected to the control valve unit <NUM>. And, a water-proof type coupler <NUM> is connected to an end portion of the other branch of the implement side harness <NUM> and this coupler <NUM> is connected to the fullness sensor <NUM>.

With the above-described arrangements in operation, when a worker operates an operational tool (not shown) provided in the riding grass mowing machine, an operational signal of the operational tool is inputted to a control device (not shown), and an operational signal from this control device is outputted to the machine body side harness <NUM>. And, the operational signal of the control device is transmitted from the machine body side harness <NUM> via the implement side harness <NUM> to the control valve unit <NUM>, whereby the control valves of the control valve unit <NUM> are operated to expand/contract the hydraulic cylinders <NUM>, <NUM>.

When the grass collecting container <NUM> becomes full of cut grass pieces, a detection signal is outputted from the fullness sensor <NUM> and this detection signal of the fullness sensor <NUM> is inputted from the implement side harness <NUM> via the machine body side harness <NUM> to the control device. Then, based on this input of the detection signal of the fullness sensor <NUM>, the control device activates an alarm lamp (not shown) or an alarm buzzer (not shown) to alert the worker.

As shown in <FIG> and <FIG>, in the cover <NUM> attached to the front portion of the control valve unit <NUM>, at a right end portion of the lower portion of the front face portion, a coupler holding portion <NUM> is formed integral with the cover <NUM>.

In the coupler holding portion <NUM>, an upper portion 35a, two side (lateral) portions 35b and a lower portion 35c are formed in continuation to form a cylindrical body and a wall portion 35d is formed integrally at the inner depth portion of the upper portion 35a, the side portions 35b and the lower portion 35c.

At the lower portion 35c of the coupler holding portion <NUM>, there is formed a recess portion 35e having a channel-like cross section and bulging downwards. And, at opposed ends of the entrance of this recess portion 35e, a pair of protruding portions 35f are formed. With these, coupler holding portion <NUM> is provided with the same shape as that of the coupler <NUM> of the machine body side harness <NUM> (see <FIG>).

As shown in <FIG> and <FIG>, a cap <NUM> is provided to be attachable to and detachable from the coupler holding portion <NUM>.

In this cap <NUM>, there are formed a body portion 36a having the same outer shape as the inner faces of the upper portion 29a, the side portions 29b and the lower portion 29c of the coupler <NUM> (see <FIG>) of the machine body side harness <NUM>, a longitudinally elongate protruding portion 36b provided at the lower face portion of the body portion 36a, protruding portions 36c provided at the opposed side portions of the protruding portion 36b, and a grip portion 36d provided at a rear portion of the body portion 36a, and this cap <NUM> is formed of synthetic resin.

The cap <NUM> is configured with the same shape as the coupler <NUM> (see <FIG>) of the implement side harness <NUM>, and the cap <NUM> differs from the coupler <NUM> of the implement side harness <NUM> in that the cap <NUM> has no connecting terminal and the cap <NUM> has the grip portion 36d.

As described above in the foregoing sections under the headings: (Attaching Operation of Grass Collecting Section to Riding Grass Mowing Machine and Grass Cutting Work) and (Arrangement of Control Valve Unit), under the condition of the grass collecting section <NUM> and the control valve unit <NUM> being attached to the riding grass mowing machine, there will arise a situation to be explained next.

As shown in <FIG> and <FIG>, the worker will connect the coupler <NUM> of the implement side harness <NUM> with the coupler <NUM> of the machine body side harness <NUM> (see the forgoing section: (Arrangements of Implement Side Harness and Coupler)) and will attach the cap <NUM> to the coupler holding portion <NUM> while holding the grip portion 36d of the cap <NUM>.

When the cap <NUM> is to be attached to the coupler holding portion <NUM>, as shown in <FIG> and <FIG>, the cap <NUM> will be inserted into the coupler holding portion <NUM> in such a manner that the protruding portions 36b, 36c of the cap <NUM> are fitted into the recess portion 35e of the coupler holding portion <NUM>.

In the course of the above, while the protruding portion 36c of the cap <NUM> and the protruding portion 35f of the coupler holding portion <NUM> will be elastically deformed and the protruding portion 36c of the cap <NUM> will ride over the protruding portion 35f of the coupler holding portion <NUM>, thereby to establish connection between the protruding portion 36c of the cap <NUM> and the protruding portion 35f of the coupler holding portion <NUM>. With this, the cap <NUM> is held and retained to the coupler holding portion <NUM>.

The above-described situation is the working state.

In this working state, as the cap <NUM> is inserted to and held by the coupler holding portion <NUM>, the cap <NUM> is stored in the coupler holding portion <NUM>, so that intrusion or adhesion of water, dust, or the like to the interior of the coupler holding portion <NUM> is prevented by the cap <NUM>.

As described above in the foregoing sections under headings of: (Attaching Operation of Grass Collecting Section to Riding Grass Mowing Machine and Grass Cutting Work) and (Arrangement of Control Valve Unit), under the condition of the grass collecting section <NUM> and the control valve unit <NUM> being detached from the riding grass mowing machine, there will arise a situation to be explained next.

As shown in <FIG> and <FIG>, the worker will detach the coupler <NUM> of the implement side harness <NUM> from the coupler <NUM> of the machine body side harness <NUM> (see the foregoing section: (Arrangements of Implement Side Harness and Coupler).

The worker, while holding the grip portion 36d of the cap <NUM>, will detach the cap <NUM> from the coupler holding portion <NUM> and then attach this cap <NUM> to the coupler <NUM> of the machine body side harness <NUM>.

Like the above case of the cap <NUM> being attached to the coupler holding portion <NUM>, as shown in <FIG>, the cap <NUM> is inserted into the coupler <NUM> of the machine body side harness <NUM> in such a manner that the protruding portions 36b, 36c of the cap <NUM> are fitted into the recess portion 28d of the coupler <NUM> of the machine body side harness <NUM>, thus establishing connection between the protruding portion 36c of the cap <NUM> and the protruding portion 29e of the coupler <NUM> of the machine body side harness <NUM>. With this, the cap <NUM> is held and retained to the coupler <NUM> of the machine body side harness <NUM>.

The worker will attach the coupler <NUM> of the implement side harness <NUM> to the coupler holding portion <NUM>.

Like the above-described case of the coupler <NUM> of the implement side harness <NUM> being attached to the coupler <NUM> of the machine body side harness <NUM>, as shown in <FIG> and <FIG>, the coupler <NUM> of the implement side harness <NUM> will be inserted into the coupler holding portion <NUM> in such a manner that the protruding portions 31b, 31c of the coupler <NUM> of the implement side harness <NUM> are inserted into the recess portion 35e of the coupler holding portion <NUM>, thus establishing connection between the protruding portion 31c of the coupler <NUM> of the implement side harness <NUM> and the protruding portion 35f of the coupler holding portion <NUM>. With this, the coupler <NUM> of the implement side harness <NUM> is held and retained to the coupler holding portion <NUM>.

The above-described situation is the non-working state.

In this non-working state, as the cap <NUM> is stored in the coupler <NUM> of the machine body side harness <NUM>. And, as the cap <NUM> is attached to the coupler <NUM> of the machine body side harness <NUM> in such as manner as to cover the connection terminal of the coupler <NUM> of the machine body side harness <NUM>, intrusion and adhesion of water, dust or the like to the coupler <NUM> of the machine body side harness <NUM> can be prevented.

In the non-working state, as the coupler <NUM> of the implement side harness <NUM> is inserted and attached to the coupler holding portion <NUM>, intrusion and adhesion of water, dust or the like to the coupler <NUM> of the implement side harness <NUM> can be prevented.

In the working state, as the cap <NUM> is attached to the coupler holding portion <NUM>, intrusion and adhesion of water, dust or the like to the interior of the coupler holding portion <NUM> is prevented, so that the undesirable event of attachment of the coupler <NUM> of the implement side harness <NUM> to the coupler holding portion <NUM> to which water, dust or the like has adhered can be avoided advantageously.

As shown in <FIG>, under the condition of the grass collecting section <NUM> and the control valve unit <NUM> being attached to the riding grass mowing machine, the direction of connection to the coupler <NUM> of the machine body side harness <NUM> by the coupler <NUM> of the implement side harness <NUM> is the left/right direction, whereas the direction of insertion to the coupler holding portion <NUM> by the coupler <NUM> of the implement side harness <NUM> is the front/rear direction, thus, the connecting direction (left/right direction) and the inserting direction (front/rear direction) being set different from and orthogonal to each other.

The control valve unit <NUM> may be attached to the grass collecting section <NUM>. With this arrangement, when the grass collecting section <NUM> is attached to or detached from the riding grass mowing machine, the control valve unit <NUM> too will be attached to or detached from the riding grass mowing machine.

As the implement side harness <NUM>, there may be employed an implement side harness <NUM> for a signal from a detection sensor (not shown) for detecting an expanded/contracted state of the hydraulic cylinders <NUM>, <NUM> of the grass collecting section <NUM>.

Under the condition of the grass collecting section <NUM> and the control valve unit <NUM> being attached to the riding grass mowing machine, the connecting direction to the coupler <NUM> of the machine body side harness <NUM> by the coupler <NUM> of the implement side harness <NUM> may be set as the front/rear direction and the inserting direction to the coupler holding portion <NUM> by the coupler <NUM> of the implement side harness <NUM> may be set as the left/right direction.

The coupler holding portion <NUM> may be provided in the machine body frame <NUM> or the ROPS frame <NUM> of the riding grass mowing machine.

With this arrangement, in the working state, connection will be established between the coupler <NUM> of the implement side harness <NUM> and the coupler <NUM> of the machine body side harness <NUM> and the cap <NUM> will be attached to the coupler holding portion <NUM> provided in the machine body frame <NUM> or the ROPS frame <NUM> of the riding grass mowing machine.

In the non-working state, the coupler <NUM> of the machine body side harness <NUM> will be attached to the coupler holding portion <NUM> provided in the machine body frame <NUM> or the ROPS frame <NUM> of the riding grass mowing machine and the cap <NUM> will be attached to the coupler <NUM> of the implement side harness <NUM>.

Claim 1:
A work vehicle comprising:
an implement (<NUM>, <NUM>) attachable to and detachable from a machine body (<NUM>, <NUM>);
an implement side harness (<NUM>) extended from an electrical unit (<NUM>) provided in the implement (<NUM>, <NUM>);
an implement side coupler (<NUM>) connected to an end portion of the implement side harness (<NUM>);
a machine body side harness (<NUM>) extended from the machine body (<NUM>, <NUM>);
an machine body side coupler (<NUM>) connected to an end portion of the machine body side harness (<NUM>);
a coupler holding portion (<NUM>) provided in the implement or the machine body (<NUM>, <NUM>), the coupler holding portion (<NUM>) being configured to hold and cover either the implement side coupler (<NUM>) or the machine body side coupler (<NUM>) in association with insertion thereto of the implement side coupler (<NUM>) or the machine body side coupler (<NUM>); and
a cap (<NUM>) attached to the implement side coupler or the machine body side coupler, or attached to the coupler holding portion;
wherein under a working state, the implement side coupler (<NUM>) and the machine body side coupler (<NUM>) are connected to each other and the cap (<NUM>) is attached to the coupler holding portion (<NUM>); and
characterized in that
under a non-working state, the implement side coupler (<NUM>) is attached to the coupler holding portion (<NUM>) of the implement and the cap (<NUM>) is attached to the machine body side coupler (<NUM>), or the machine body side coupler (<NUM>) is attached to the coupler holding portion (<NUM>) of the machine body (<NUM>, <NUM>) and the cap (<NUM>) is attached to the implement side coupler (<NUM>).