JP2003175832A - Farm working machinery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain stable steering to travel straight without losing control due to ground unevenness and mud, etc., during travel by an operator getting off a working machine. <P>SOLUTION: A manual clutch lever 50 possible to operate by getting off the working machine is provided at the front part of the hood 18 of a riding rice transplanter. Travel and stop of the working machinery 16 is operated by swinging the manual clutch lever 50 back and forth. When the manual clutch lever 50 is turned to the front of the machine, the clutch is disengaged and a parking brake is canceled with declutching and the machine is possible to travel. Simultaneously a lock bar 77 is turned with a rotating support shaft 52, along with the turning operation of the manual clutch lever 50 forward of the machine, the lock lever 77 is engaged with the receiving surface 80a of the locking member 80 fixed to the pitman arm 76, and the machine traveling direction is locked in the nearly straight direction. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to an agricultural work machine such as a riding rice transplanter. 2. Description of the Related Art In an agricultural work machine such as a riding rice transplanter, when the machine is moved into or out of a field,
In some cases, steep ridges are crossed. At the time of crossing the ridge, the body is largely inclined forward and backward. In such a case, it is preferable that the operator can operate the vehicle with the vehicle getting off. In addition, when the aircraft is moved to a remote place, the aircraft may be transported by loading it on a carrier such as a truck. Passing the fuselage plate (inclined plate)
It is desirable to be able to run on the car. On the other hand, for example, Japanese Patent Laid-Open No. 2000-12
As disclosed in Japanese Patent No. 7983, a technique is known in which an auxiliary handle that can be operated by getting off the vehicle is provided at the front of the agricultural work machine. [0004] However, in an agricultural work machine provided with an auxiliary handle that can be operated in a dismounting state as in the above-described conventional example, the on / off operation of the traveling clutch is performed by using a specially provided dedicated operation. Since the switching lever had to be used, it was troublesome to operate the clutch when getting off the vehicle and steering. In addition, if the body continues to travel when the auxiliary handle is released, for example, when the foot slips and falls, it is difficult to safely perform the traveling operation after getting off the vehicle. . Further, for example, during a running operation after getting off the vehicle,
If the traveling direction of the aircraft fluctuates due to irregularities on the ground, mud, or the like, inconveniences such as abrupt removal of the handle may occur. SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to prevent the handle from being accidentally removed due to unevenness or mud on the ground during a running operation after getting off the vehicle. It is another object of the present invention to provide an agricultural work machine that can safely get off from the front and perform an operation using a walking operation tool. [0008] In order to achieve the above object, according to the first aspect of the present invention, the traveling and stopping of the work machine main body (16) is operated by a get-off operation and swinging operation. A walking operation tool (5) which is biased so that the clutch is disengaged and the brake is operated to be braked, and which is operated by the operation on the traveling side such that the clutch of the traveling system is engaged and the brake is released;
0) and a steering lock member (77, 80a) that moves based on the operation of the walking operation tool (50) to the traveling side to lock the steering direction of the steering handle (24) at a predetermined position. It is characterized by having. According to the first aspect of the present invention, when the walking operation tool (50) is operated to the traveling side, the steering lock member (77) moves based on the operation, and the steering handle (24) is operated. Since the direction is locked at a predetermined position, the steering lock keeps the vehicle running in a substantially constant direction. Therefore, when the vehicle is running in this state, even if there is unevenness or mud on the ground, it is possible to safely get off from the front and operate the walking operation tool (50) without accidentally removing the handle (24). Becomes possible. Further, even if the hand is released from the walking operation tool (50), since the walking operation tool (50) is urged so that the clutch is disengaged and the brake is actuated, the machine body is stopped as it is and a safe The traveling operation becomes possible. Note that the reference numerals in parentheses described above are for referring to the drawings, and do not limit the present invention in any way. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall side view of a riding rice transplanter as an agricultural working machine according to the present invention. This riding rice transplanter 10
The vehicle has a traveling body 16 supported by the front wheels 12 and the rear wheels 14, and the traveling body 16 has an engine 20 mounted in a hood 18 at a front portion. A driver's seat 28 having a steering handle 24, a seat 26, various operation levers, and the like is disposed on the traveling body 16. A stepped surface of the driver's seat 28 includes a clutch pedal 30 and a brake pedal. (Not shown) are provided. At the rear of the engine 20, a transmission case 22, which is integral with the engine 20 and in which the front wheel 12 is supported, is mounted.
It is input to the transmission case 22 via a belt-type continuously variable transmission. The input power is transmitted to the front wheels 12 after being shifted by the transmission case 22, and is also transmitted to the rear wheels 14 via the traveling PTO shaft 122 (see FIG. 17). Further, from the rear of the transmission case 22,
Power for work is transmitted to a planting section 32 described below via a planting PTO (not shown). A link mechanism 34 is provided behind the traveling body 16.
The planting part 32 is supported so as to be able to move up and down via the vein. The planting part 32 is provided with a large number of planting rods 36, floats 37, and a seedling mounting table 38 on which mat seedlings can be placed. I have. The planting section 32 is controlled to move up and down by a telescopic operation of a hydraulic cylinder device (not shown). The steering handle 24 and the transmission case 22 are connected by a torque generator (not shown). When the steering handle 24 is rotated, the torque generator is activated to generate a hydraulic output to transmit the transmission. The steering is transmitted to the front axle via a speed reduction mechanism in the case 22 and is steered. FIG. 2 shows a body frame constituting the traveling body 16 and a clutch mechanism 2 capable of turning on and off transmission of traveling driving force.
9 and a brake mechanism 1 for applying a braking force to the traveling drive unit
25 shows an outline. Referring to FIG. 1, two main frames 40 extend in the front-rear direction on both left and right sides of the fuselage, and a front portion of the main frame 40 is bent inward at a substantially right angle. It is connected to the engine base 42. A horizontal frame 46 is fixed to a middle portion of the main frame 40 in the longitudinal direction via a bracket 44. A battery mounting frame 47 is provided at the front right side of the main frame 40, and a sub frame 48 is attached to the rear of the main frame 40 and to the side of the main frame 40. A clutch mechanism 29 having a clutch pedal 30, a clutch shaft 56, and the like, and a brake mechanism 125 having a brake link lever 100, a brake shoe 126, and the like are arranged substantially along the body frame. The clutch mechanism 29 and the brake mechanism 1
Details of 25 will be described later. As described above, when the steering handle 24 is rotated, a torque generator (not shown) is rotated, and the sector gear is driven via a sector gear (not shown) at the lower end of the steering handle 24. The rotational power is transmitted to a sector shaft 75 (see FIG. 9) spline-coupled to the pitman arm, and a pitman arm 76 coupled to a lower portion of the sector shaft 75 is operated. Then, the rotational power transmitted to the pitman arm 76 is transmitted to a front axle (both not shown) via a drag link, and the front wheels 12 are steered. In this embodiment, a walking operation tool 50 that is biased so that the clutch is disengaged and the brake is actuated, and the clutch of the traveling system is engaged and the brake is released by operating the traveling side, A steering lock member 77 that moves based on the operation of the walking operation tool 50 toward the traveling side and locks the steering direction of the steering handle 24 at a predetermined position. That is, in FIGS. 1 to 3, a manual clutch lever (walking operation tool) 50 is provided below the front of the bonnet 18 so as to be rotatable back and forth around the rotation fulcrum shaft 52 extending in the body width direction. Have been. The manual clutch lever 50 can be operated after getting off the vehicle, and can be switched between running and stopping of the body by swinging operation. When this is rotated forward (C 'side in FIG. 1), the body Is switched to the traveling side, and when the hand is released from this position, it automatically returns to the original position by the biasing pressure of the spring described later (C side in FIG. 1), and the body is switched to the traveling stop side. As shown in FIGS. 3 and 4, the manual clutch lever 50 has a mounting base side rotatably mounted on the rotation fulcrum shaft 52 so as to be rotatable.
45, left and right hollow members 50a, 50a bolted to the lever members 45, 45, and a connecting stay 49 for integrally connecting the left and right hollow members 50a, 50a on the distal end side. Rubber members 50b, 50b cover the distal end grip portions of the hollow members 50a, 50a. The hollow member 50a is designed so that a tensile force is applied to the hollow member 50a when the manual clutch lever 50 is operated toward the traveling side, that is, when the manual clutch lever 50 is rotated forward. It extends substantially linearly from the base side to the distal end gripping side, and the distal end gripping portion is curved. At the connecting stay 49, a center marker 54, which serves as a mark for tracing along a line drawn on the field, is attached at an intermediate portion in the longitudinal direction and substantially at the center position in the machine width direction. Have been. This center marker 54
Is mounted so as to be pivotally adjustable in the front-rear direction by a bolt 55. A lock bar (steering lock member) 77 extending downward and substantially perpendicular to the axial direction of the rotation fulcrum shaft 52 is integrally and vertically suspended from the rotation fulcrum shaft 52. When the fulcrum shaft 52 rotates, it rotates accordingly. On the other hand, one end of a lock arm 78 is fixed to the pitman arm 76 with a bolt 79, and a lock member 80 having a substantially V-shaped receiving surface 80a is integrally formed at the other end of the lock arm 78. Fixed by welding. When the manual clutch lever 50 is rotated forward (C 'side in FIG. 1), the rotation fulcrum shaft 52 is moved.
1 also rotates counterclockwise in FIG. 1, and the lock bar 77 also rotates in the same direction, and the lock bar 77 contacts the receiving surface 80 a of the lock member 80. Accordingly, the left and right swing of the pitman arm 76 fixed integrally with the lock member 80 is restricted, and the steering direction of the steering handle 24 is locked substantially in the straight traveling direction. Next, the linkage between the manual clutch lever 50 and the clutch mechanism 29 will be described. 5 to 7, the clutch pedal 3
By depressing “0”, a clutch arm (not shown) provided on the transmission case 22 operates via the clutch shaft 56 connected to the pedal, and the disc clutch is engaged and disengaged. At an intermediate position between the clutch shaft 56 and the rotation fulcrum shaft 52 of the manual clutch lever 50, substantially in parallel with the rotation fulcrum shaft 52 and the clutch shaft 56,
A fulcrum shaft 59 of the linkage operation lever 58 and a fulcrum shaft 61 of the linkage plate 60 are mounted on the base plate 57 in front of the fulcrum shaft 59 (see FIG. 6). The link plate 60 has an elongated hole 60a having a recess 60b. A lock lever 62 facing the linkage operation lever 58 is rotatably mounted on the fulcrum shaft 59. The lock lever 62 and the linkage operation lever 58 are connected to a pin 64. Are connected so as to be integrally rotatable. The lock lever 62 has a hook-shaped hook portion 62a and an elongated hole 62b formed in the vicinity thereof. An L-shaped engagement plate 66 which can rotate about the fulcrum shaft 59 with a small gap in the axial direction of the fulcrum shaft 59 with respect to the linkage operation lever 58 and the lock lever 62. Are arranged facing each other. An engaging pin 66a is implanted on a horizontal side of the engaging plate 66, and a projection 66b is formed on an upper side of the vertical side. The link operation lever 58 (and the lock lever 62) is arranged so as to be rotatable about the fulcrum shaft 59 and to be slidable in the axial direction of the fulcrum shaft 59. When the linkage operation lever 58 is rotated and slid in a substantially U-shape about the fulcrum shaft 59, the linkage operation lever 58 is moved to two guide portions of the guide plate 68 as shown in FIG. 68a, 68c. That is, in FIG. 8, when the link operation lever 58 is engaged with one of the guide portions 68a (normal position), the clutch ON / OFF operation by only the clutch pedal 30 becomes possible as usual. In addition, the link operation lever 5
After the sliding operation of the shaft 8 in the axial direction of the fulcrum shaft 59, the clutch engagement / disengagement operation by the clutch pedal 30 or the manual clutch lever 50 becomes possible in a state of being engaged with the other guide portion 68c (an interlocking position). Further, when the link operation lever 58 is engaged with the guide portion 68b (release position), the clutch operation and the brake operation by the manual clutch lever 50 cannot be performed. In the present embodiment, the guide plate 6
Since the guide portions 68a to 68c, which are substantially U-shaped in plan view, are formed at 8, the switching position of the link operation lever 58 becomes clear, and erroneous operation can be prevented. Also, this guide section 68
Since the inclined portion 68d is provided between b and the guide portion 68c,
The inclined portion 68d serves to guide the linkage operation lever 58 and also to prevent the linkage operation lever 58 from returning. Further, when the link operation lever 58 is switched between the guide portions 68a and 68c, the switching operation direction is U-shaped.
Can be made small, so that the space near the lever can be widened. 6 and 7, the arm 30a of the clutch pedal 30 and the link plate 6
0 is connected by a link rod 70 whose both ends are pivotally mounted by pins 72 and 74. Therefore, when the clutch pedal 30 is depressed, the link plate 60 rotates clockwise through the link rod 70. The arm 30a of the clutch pedal 30 is provided with a lock pin 30b. Further, in FIGS. 6 and 7, a lever arm 51 is integrally fixed to the manual clutch lever 50 on the base end side thereof, and the lever arm 51 is rotatable about a rotation fulcrum shaft 52. Is being worn. This rotation fulcrum shaft 52
Has a triangular plate 82 pivotally mounted on it,
One end of a link arm 84 is pivotally attached to the triangular plate 82 via a pin 86. On the other end side of the link arm 84, an elongated hole 84a is formed.
An engagement pin 66a implanted in the engagement plate 66 is fitted to 4a. Also, the link arm 84 and the link plate 60
That is, the pin 87 implanted in the link arm 84 is fitted into the long hole 60 a of the link plate 60. On one side of the triangular plate 82,
One end of a piston rod 91 urged by a spring 90 abuts, and the other side of the triangular plate 82 abuts a pin 53 implanted in the lever arm 51.
Thus, the manual clutch lever 50 is constantly urged in the clockwise direction in the figure around the rotation fulcrum shaft 52 via the pin 53 and the lever arm 51 by the urging pressure of the spring 90 described above. For this reason, when the hand is released from the manual clutch lever 50, the manual clutch lever 50 is configured to automatically return to the original position (running stop side) by the urging pressure of the spring 90. As described above, in a state where the manual clutch lever 50 and the clutch pedal 30 are not linked as shown in FIG. 6, when the clutch pedal 30 is depressed, the link plate 60 is pressed via the link rod 70, It rotates clockwise in the figure around the fulcrum shaft 61. However, in this case, the pin 87 implanted in the link arm 84
Can freely move in the long hole 60 a of the link plate 60, so that the rotation of the link plate 60 is not transmitted to the link arm 84. Therefore, in this state, the manual clutch lever 50 and the clutch mechanism 29 are not linked. On the other hand, as shown in FIG. 9, the manual clutch lever 50 is also linked to a brake mechanism (parking brake mechanism) 125. That is, the brake mechanism 125 includes the brake link lever 100, the brake operating rod 120, the brake shoe 126 (see FIG. 2), and the like, and is implanted in the lever arm 51 on the base end side of the manual clutch lever 50. One end of the brake link lever 100 is connected to the pin 53. The other end of the brake link lever 100 is connected to the switching plate 10 via an engagement pin 102.
4 and the mounting pin 1
06 and one end of an inner wire 110 via a spring 108. The other end of the inner wire 110 is connected to the above-described clutch engagement plate 66. Further, the switching plate 104 has a
As shown in FIG. 0, two holes 11 are provided on the left and right sides of the pivot 112 so as to be swingable about the pivot 112.
4,116 are drilled. These two holes 114,1
The torsion spring 118 is mounted in one of the holes 114, and one end of a brake operating rod 120 is axially mounted in the other hole 116. In the state shown in FIG. 9, the engagement pin 102 of the brake link lever 100 and the switching plate 104 are not linked to each other due to the interposition of the elongated hole 104a. For this reason, the manual clutch lever 50 and the parking brake do not interlock. Then, as shown in FIG. 11, the clutch pedal 30 is depressed, the link operation lever 58 is pulled together with the lock lever 62 in the direction of the arrow, and the lock pin 30b of the clutch pedal 30 is hooked on the hook portion 62a of the lock lever 62. Then, the clutch pedal 30 is locked in the depressed state. As described above, since the clutch can be fixed while the clutch pedal 30 is depressed, as described later, the aircraft does not start moving even if the user gets off the aircraft in that state. Next, as shown in FIG. 12, when the linkage operation lever 58 is slid in the axial direction of the fulcrum shaft 59 from this pedal locked state, the long hole 6 of the lock lever 62 is moved.
When the projection 66b of the engagement plate 66 is fitted into 2b, the linkage operation lever 58 and the engagement plate 66 are integrated, and when the linkage operation lever 58 is operated in the direction of the arrow in this state, both levers rotate integrally in the same direction. I do. Accordingly, the long hole 84a of the link arm 84
The engagement pin 66a of the engagement plate 66 fitted into the hole contacts the end of the long hole 84a, and pulls the link arm 84 in the longitudinal direction. As a result, the pin 87 is connected to the link plate 60.
, The manual clutch lever 50 and the clutch pedal 30 are linked to each other to form an interlocking relationship. Then, the hook portion 62 of the lock lever 62
a separates from the lock pin 30b of the clutch pedal 30,
The pedal lock is released. However, clutch pedal 3
0 is restored (even if the connecting rod 70 is moved in the direction of the arrow), the pin 87 is indented 60b.
And the urging force of the spring 90 is stronger than the urging force of the clutch pedal 30, so that the spring 90 cannot return and the clutch disengaged state is maintained. On the other hand, as shown in FIG. 13, when the linkage operation lever 58 is operated to a position where the operation with the manual clutch lever 50 becomes possible, the engagement plate 66 moves counterclockwise around the fulcrum shaft 59 in the figure. The inner wire 110 rotates and the inner wire 110 is pulled. Next, as shown in FIG. 14, when the manual clutch lever 50 is turned forward (toward the arrow C 'side), the clutch pedal 30 returns to the original position, and the clutch is connected. Thereby, the traveling body 16 can travel with the power of the engine 20. As described above, with the manual clutch lever 50 and the clutch interlocked, the manual clutch lever 50
When the clutch pedal 30 is tilted forward, the clutch pedal 30 is lifted, and when the manual clutch lever 50 is returned, the clutch pedal 30 is lowered, so that it can be visually confirmed whether or not the clutch is disengaged. On the other hand, as shown in FIG. 15, when the manual clutch lever 50 is rotated forward (in the direction of the arrow C ') about the rotation fulcrum shaft 52, the brake link lever 100 is moved in the direction of the arrow (in the figure). Right) and the other end of the brake linkage lever 100 is
0 and the spring 108, the engagement pin 102 is moved rightward and engages with the recess 104b of the elongated hole 104a. That is, by operating the linkage operation lever 58 in the direction of the arrow, the inner wire 110 connected to the engagement plate 66 is pulled, and while the brake linkage lever 100 is urged upward in FIG. Once the clutch is turned on by rotating it forward, the brake mechanism 125 is activated when the manual clutch lever 50 is returned. At this time, since the force for urging the brake link lever 100 upward against the force of the torsion spring 118 only needs to be such that the torsion spring 118 is bent, the operation load of the link operation lever 58 is small. Good. In this state, when the manual clutch lever 50 is returned to the rear of the machine (arrow C side) as shown in FIG. 16, the brake link lever 100 is pulled in the arrow direction (left side in the figure), and the switching plate is switched. 104 rotates clockwise (in the direction of the arrow) about the pivot 112, whereby the brake operating rod 120 moves downward in the drawing (in the direction of the arrow), and the brake mechanism 125 performs the braking operation. Therefore, according to the present embodiment, the vehicle can travel only when the manual clutch lever 50 is operated and held in front of the vehicle (running side). It returns to the position and the parking brake is activated.
That is, when the manual clutch lever 50 is being rotated forward of the fuselage, the vehicle can travel, and when the manual clutch lever 50 has returned to the upper portion of the fuselage (travel stop side), the parking brake is activated. Travel is stopped. FIG. 17 shows a main structure of the brake mechanism (parking brake mechanism) 125 described above. In the same drawing, a grooved pulley 124 is disposed on the outer periphery of the traveling PTO shaft 122 so as to be integrally rotatable, and a brake shoe 126 is disposed above the grooved pulley 124 so as to face the same. One end of the brake shoe 126 is rotatably mounted on a rotation fulcrum 128, an intermediate portion is urged by a spring 130 in a direction to release the brake, and a collar 132 is fixed to the other end. The brake actuation rod 120 is slidably fitted to the collar 132, and the collar 132 includes a spring (compression) 134.
Is always biased downward in the drawing. When the collar 132 moves downward due to the pressure of the spring (compression) 134, the brake shoe 126 rotates downward about the rotation fulcrum 128 integrally with the collar 132, and the parking brake operates. On the other hand, when the downward movement of the collar 132 is restricted by the switching plate 104, the brake shoe 126
Moved upward by 30 and the parking brake is not activated. Next, the operation will be briefly described. During traveling on a road or working in a field, the steering wheel 24, the clutch pedal 30, and a brake pedal (not shown) are operated to travel the aircraft. Here, for example, when going over a ridge, in the case of a steep ridge, the body is greatly inclined back and forth, so it is desirable that the operator get off and steer. Then, the operator moves the airframe to the ridge, depresses the clutch pedal 30 while riding, and operates the link operation lever 58 in a substantially U-shape along the guide portions 68a to 68c. Operate to the linked position. At this time,
As shown in FIG. 12, the projection 66b of the engagement plate 66 fits into the long hole 62b of the lock lever 62, and the link operation lever 58
And the engaging plate 66 are integrally rotated in the same direction. Accordingly, the engaging pin 66a fitted in the long hole 84a of the link arm 84 comes into contact with the end of the long hole 84a, and pulls the link arm 84 in its longitudinal direction. As a result, the pin 87 is connected to the link plate 60.
, The manual clutch lever 50 and the clutch pedal 30 are linked. At this time, the clutch is disconnected. On the other hand, as shown in FIG.
However, when the inner wire 110 is pulled in the same direction about the fulcrum shaft 59 together with the linkage operation lever 58, the inner wire 110 is pulled, but the engagement pin 102 of the brake linkage lever 100 and the switching plate 104 are linked by the elongated hole 104a. Therefore, the brake mechanism 125 does not operate. In this state, when the operator gets off the vehicle and turns the manual clutch lever 50 forward (arrow C 'side) as shown in FIG. 14, the clutch pedal 30 returns to the original position and the clutch is engaged. . In this way, the aircraft starts traveling uphill along the slope at the ridge. At this time, when the manual clutch lever 50 is rotated forward, the rotation fulcrum shaft 52 and the lock bar 77 also rotate counterclockwise in FIG.
With the rotation of the lock bar 77, the lock bar 77 comes into contact with the receiving surface 80a of the lock member 80, whereby the left and right swing of the pitman arm 76 is restricted, and the steering direction of the steering handle 24 is locked in a predetermined forward direction. As a result, the aircraft travels substantially straight, and can safely travel without the handle being accidentally removed due to unevenness or mud on the ground. Also, the brake link lever 100 is shown in FIG.
As shown in FIG. 5, while being pushed in the direction of the arrow (rightward in the figure), the engaging pin 102 is moved rightward by the inner wire 110, and is engaged with the concave portion 104b of the long hole 104a.
The brake mechanism 125 enters the interlockable state. For this reason, if the hand is released from the manual clutch lever 50 in the middle of climbing a hill, the manual clutch lever 50 automatically returns to the rear of the machine (arrow C side) as shown in FIG. . As a result, the brake link lever 100 is pulled in the direction of the arrow (to the left in the figure), the switching plate 104 rotates clockwise (in the direction of the arrow) about the pivot 112, and the brake actuation rod 120 is moved downward (in the direction of the arrow). Direction), and the brake mechanism 125 performs the braking operation. This prevents the aircraft from slipping off the ridge due to its own weight. When the crossing of the ridge ends, the operator releases the manual clutch lever 50. At this time, the brake mechanism 125 of the body is stopped by the braking operation. Then, the operator gets on the vehicle and operates the link operation lever 58.
Is operated to the normal position in FIG. Thus, the linkage between the manual clutch lever 50 and the clutch mechanism 29 and the brake mechanism 125 is released, and the normal steering handle 24, the clutch pedal 30, and the brake pedal (not shown) are used.
Traveling operation can be performed. As described above, according to the first aspect of the present invention, the operating tool which can be operated by getting off the vehicle is urged so that the clutch is disengaged and the brake is operated. ,
And a walking operation tool in which the clutch of the traveling system is engaged and the brake is released by an operation on the traveling side; and When the steering is locked, the vehicle body running is held in a substantially constant direction (for example, the straight running direction). Without being taken off, it is possible to safely get off from the front and perform the operation using the walking operation tool. Also,
When the hand is released from the walking operation tool, the traveling clutch is disengaged and the brake enters the braking operation state, and the aircraft stops, so that the traveling operation after getting off the vehicle can be performed safely.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a riding rice transplanter to which the present invention is applied. FIG. 2 is a plan view showing an outline of an airframe, a clutch and a brake mechanism constituting the traveling airframe. FIG. 3 is a front view of the same. FIG. 4 is a front view of a state where a center marker is attached. FIG. 5 is an enlarged plan view of a main part of FIG. 2; FIG. 6 is a side view in a state where the manual clutch lever and the clutch mechanism are not linked. FIG. 7 is an enlarged side view of a main part of the above. FIG. 8 is a plan view showing an operation position of a link operation lever. FIG. 9 is a side view of a state where the manual clutch lever, the clutch mechanism, and the brake mechanism are not linked. FIG. 10 is a front view of a switching plate. FIG. 11 is a side view showing a state where the clutch pedal is depressed and the pedal is locked. FIG. 12 is a side view showing a state in which a manual clutch lever and a clutch mechanism are linked. FIG. 13 is a side view showing a state in which the manual clutch lever and the clutch mechanism are linked and not linked to the brake mechanism. FIG. 14 is a side view showing a state where the clutch is engaged by a forward operation of the manual clutch lever. FIG. 15 is a side view of a state in which the clutch is engaged and the brake is released by a forward operation of the manual clutch lever. FIG. 16 is a side view showing a state in which the clutch is disengaged and the brake is operated by the returning operation of the manual clutch lever. FIG. 17 is a front view of the brake mechanism. DESCRIPTION OF SYMBOLS 10 Riding rice transplanter 12 Front wheel 14 Rear wheel 16 Running machine body 20 Engine 22 Transmission case 29 Clutch mechanism 30 Clutch pedal 29a Clutch arm 29b Lock pin 50 Manual clutch lever (walking operation tool) 52 Rotating fulcrum shaft 54 Center Marker 56 Clutch shaft 58 Link operation lever 59 Support shaft 60 Link plate 61 Support shaft 62 Lock lever 66 Engagement plate 68 Guide plates 68a to 68c Guide portion 76 Pitman arm 77 Lock lever (steering lock member) 79 Bolt 80 Lock member 80a 90 Spring 104 Switching plate 104a Slot 104b Recess 125 Brake mechanism 126 Brake shoe

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Yoji Ishida             667 Iya-cho, Higashiizumi-cho, Yatsuka-gun, Shimane Prefecture             1 Mitsubishi Agricultural Machinery Co., Ltd. F-term (reference) 3D030 DH21                 3J070 AA03 BA05 BA41 CC02 DA24                       EA11

Claims (1)

Claims: 1. An operating tool which is operable after getting off a vehicle and operated to move and stop a work machine main body by a swing operation, wherein the operating device is biased so that a clutch is disengaged and a brake is operated. And a walking operation tool in which the clutch of the traveling system is engaged and the brake is released by the operation on the traveling side, and the walking operation tool is moved based on the operation on the traveling side,
An agricultural work machine comprising: a steering lock member that locks a steering direction of a steering handle at a predetermined position.