JP2002142509A - Implement-lifting mechanism of tilling machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the implement-lifting mechanism of a walking tilling machine, which can lift a rotary tilling device without largely lifting a handle. SOLUTION: This implement-lifting mechanism of the walking tilling machine 30 (30a, 30b) in which an implement 4 is linked to the rear portion of the machine frame main body 1, is characterized by interlocking the handle 22, the implement 4 and a rear wheel 46 through links, so that, when the handle 22 is pushed down, when a lifting operation lever 75 is operated, or when an actuator 50 is operated, the implement 4 is perpendicularly lift, and the rear wheel 46 is lowered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevating mechanism for a working machine of a walking type cultivator.

[0002]

2. Description of the Related Art In a conventional walk-type cultivator, a traveling cultivator, such as a rotary cultivator, must be lifted and kept away from the ground during traveling or turning, or it may interfere with traveling.
When running, lower the tail wheel and raise the work equipment to break the ridge. Also, when turning, the working machine was raised by lifting the handle.

[0003]

However, the operation of lowering the tail wheel requires an operation of rotating the screw rod or an operation of lowering and locking the tail wheel support rod, which is a troublesome operation when circling the field end. . In addition, in the method of lifting the handle, the work machine such as the rotary tilling device is also lifted, so that the weight makes the balance unstable, and the elderly and women have been working hard. In addition, when the rotary tilling device is rotated at the revolving end while the tilling claw is turned, the tilling claw is exposed when the handle is raised, and there is a possibility that the field is damaged. As a mechanism for raising and lowering the rotary tilling device, there is a technique disclosed in Japanese Utility Model Application Laid-Open No. 58-29204. However, since the rear part of the body and the front part of the rotary tilling device are connected via a parallel link, the body is limited by the parallel link. The total length is longer and the non-work area at the field edge is larger. In addition, since the vertical link is configured to be moved up and down by the rotation of the screw rod provided on the parallel link, the operation time for moving up and down is lengthened, resulting in a troublesome operation. In view of the above problems, the rotary tillage device is raised without lifting the handle to reduce the burden on the operator during traveling or turning and improve safety.

[0004]

The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described.

More specifically, in a walk-behind cultivator in which a working machine is attached to a rear portion of a body of a machine, a handle and a working machine are interlocked via a lifting link mechanism, and a turning operation is performed by pushing down the handle. The work machine was configured to rise.

According to a second aspect of the present invention, an assist device is provided at a connection portion between the machine body and the work machine for reducing a handle pressing load.

According to a third aspect of the present invention, in a walking type cultivator in which a working machine is mounted on a rear portion of a body of a machine, a handle and a working machine are interlocked via a lifting link mechanism, and a lifting lever is connected to the lifting link mechanism. Then, the working machine is configured to be raised and lowered by rotating the lifting lever.

According to a fourth aspect of the present invention, a rotation restricting mechanism is provided on the rotation operation section.

According to a fifth aspect of the present invention, in a walking cultivator in which a working machine is mounted on a rear portion of a body of the machine, a handle and a working machine are interlocked via a lifting link mechanism, and a lifting actuator is provided between the handle and the working machine. Was placed.

[0010]

Next, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is an overall side view of a walking type cultivator according to a first embodiment, FIG. 2 is a transmission path diagram, and FIG. 3 is a cross-sectional plan view of a chain case. FIG. 4 is a side view showing the elevation of the hitch, and FIG. 5 is a side view of the hitch. FIG. 6 is a partial cross-sectional view of the side surface of the handlebar rotation restricting mechanism, and FIG. 7 is a partial cross-sectional view of the tail wheel. FIG.
FIG. 9 is a side view showing the rear part of the body of the walking-type tiller according to the first embodiment during the tilling operation, and FIG. 9 is a side view showing the rear part of the body during traveling. FIG. 10 is an overall side view of the walk-behind cultivator according to the second embodiment, FIG. 11 is a side view of the same hitch, FIG. 12 is a side view of the same upper link, and FIG. FIG. 14 is a partial cross-sectional side view showing a rotation restricting mechanism of the lifting lever. FIG. 15 is a side view showing the rear part of the body during the tilling operation of the walk-type cultivator according to the second embodiment, and FIG. 16 is a side view showing the rear part of the body during traveling. FIG. 17 is an overall side view of the walking-type cultivator according to the third embodiment, FIG. 18 is a side view showing the rear part of the body during tilling work, and FIG. 19 is a side view showing the rear part of the body during traveling.

First, a first embodiment will be described.

First, an overall configuration of a walking type cultivator 30 using a cultivator as an embodiment will be described with reference to FIGS. The walking type cultivator 30 includes an engine 2 at a front portion, a rotary cultivator 4 as a working machine at a rear portion, and a transmission case 3 at a center portion. The engine 2 is mounted and fixed on an engine base 5. Is fixed to the transmission case 3. Pulleys 6a and 7 are provided on an output shaft 6 of the engine 2 and an input shaft 7 of the transmission case 3, respectively.
a is fixedly provided so that power is transmitted through a transmission belt. A belt tension type main clutch 10 is disposed between the output shaft 6 and the input shaft 7, and these are covered by a transmission case 9.

The rotational power of the rotational power input from the input shaft 7 into the transmission case 3 is adjusted by a transmission, and the axle 11 is supported in the transmission case 3 below the transmission case 3. The wheels 12 are fixed to the axle 11 so that the vehicle can be driven to travel.

A hitch 13 is provided at a rear portion of the transmission case 3, and a front portion of the rotary tilling device 4 is connected to the hitch 13. On the rotary tilling device 4, a refraction type chain case 26 is disposed on one side (right side) of the transmission case, and a PTO shaft 15 protruding laterally from the transmission case 3 is provided at a front portion of the transmission case 3.
To penetrate and transmit power. And
A rotary (work or PT)
O) A clutch 25 is provided. However, the rotary clutch 25 may be provided in the transmission case 3. At the rear of the chain case 26, a rotary input shaft 27 is pivotally supported, and the rotary input shaft 27 and the tilling claw shaft 16 are wound around a chain in the rotary drive case 14 so that the tilling claw shaft 16
Power is transmitted to. A plurality of cultivating claws 17 are implanted on the shaft of the cultivating claw shaft 16. Covered with.

As shown in FIG. 3, the refraction type chain case 26 comprises two front and rear chain cases 26 of a front case 26a and a rear case 26b, and the rear part of the front case 26a and the front part of the rear case 26b rotate. The shape is freely connected. Then, at the front of the front case 26a, P
A sprocket 52 fitted to the end of the TO shaft 15 is rotatably supported, and a sprocket 55 fitted to the rotary input shaft 27 is rotatably supported at the rear of the rear case 26b. A connecting shaft 58 connects the front case 26a and the rear case 26b in the left-right direction to a connecting portion 26e of the front case 26a and the rear case 26b, and the connecting shaft 58 rotates around the front case 26a and the rear case 26b, respectively. It is movably supported.

A sprocket 53 is fitted in the front case 26a of the connecting shaft 58, and a sprocket 54 is fitted in the rear case 26b of the connecting shaft 58. The sprocket 54 is turned around the rear case 26b. It is movably supported. A transmission chain 56 is wound between the sprocket 52 at the end of the PTO shaft 15 and the sprocket 53 fitted on the connection shaft 58 in the front case 26a. Similarly, in the rear case 26b, the sprocket 54 fitted on the connecting shaft 58 and the sprocket 5
A transmission chain 57 is fitted between the five. Therefore, PTO
With the connecting shaft 58 interposed between the shaft 15 and the rotary input shaft 27, even if the chain case 26 is bent at the connecting portion 26e, the PTO is transmitted by the transmission chains 56 and 57 without any trouble.
The rotational drive of the shaft 15 is transmitted to the rotary input shaft 27 via the connection shaft 58. And the rotary input shaft 2
Reference numeral 7 also has a sprocket fitted at the end opposite to the end inserted into the chain case, and inputs the sprocket to the rotary drive case 14.

As described above, by making the chain case 26 bendable, the rotary tilling apparatus 4 moves up and down as described later, and the position of the rotary input shaft 27 with respect to the PTO shaft 15 changes. Even if there is a change between the cores of the sprockets 52 and 55 fitted in (15.27), the front and rear and central pivot portions of the chain case 26 are bent to cope with this.

Here, the rotary tilling device 4 as a working machine
The connecting portion between the and the body 2 will be described. The rotary tilling device 4 is connected to a rear portion of the body 1 by a hitch 13 provided on a rear surface of the transmission case 3. By connecting the machine body 1 and the rotary tilling device 4 by the hitch 13, the center of gravity of the cultivator 30 can be moved as little as possible, and the change in the posture of the cultivator can be suppressed as much as possible so that the cultivator can slide up and down in a substantially vertical direction. I have. As shown in FIG. 4, the hitch 13 is configured such that the hitch on the rotary tilling device 4 side is vertically movable with respect to the hitch on the body 1. As shown in FIG. 5, the hitch 13 on the body 1 side includes a bracket 61 attached to the right side of the transmission case 3 at the rear and a vertically extending rail 63 fixed to the rear end of the bracket 61. It is configured. Therefore, the position of the hitch 13 on the side of the body 1 is fixed with respect to the body 1.

On the other hand, the hitch 13 on the rotary tiller 4 side
Is composed of a bracket 64 fixed to the rotary drive case 14 and a sliding body 65 screwed to the bracket 64. The sliding body 65 includes a plate 65e on which the bracket 64 is screwed, upper and lower rollers 65a and 65b fitted on the rail 63, and an assist device (6
2) It is composed of an arm 65d supporting one end. The sliding body 65 is configured to be slidable on rails 63 provided on the hitch 13 of the body 1 by rollers 65a and 65b. Of the rollers 65a and 65b, the upper roller 65a is coaxial with the handle 22 of the handle 22. A rod 24 connecting the front end and the hitch 13 of the rotary tilling apparatus 4 is rotatably provided, and the vertical movement of the handle 22 and the vertical movement of the hitch 13 are linked.

In the cultivator 30 according to the present invention, the hitch 13
The rail 63 for guiding the ascending and descending is provided in a substantially vertical direction, and therefore, the hitch 13 slides on the rail 63 in a substantially vertical direction. That is, the rotary tilling apparatus 4 does not change its posture but in a substantially vertical direction. To go up and down. As described above, when the rotary tilling device 4 moves up and down substantially vertically, the angle of the rotary tilling device 4 does not change, so that the angle change between the tilling case 31 and the tilling claws 17, 17,. Are not exposed to the operator when the handle 22 is lifted.

Further, a mudguard sheet 19 is provided at the rear of the tilling case 31 to prevent the soil from jumping up. However, even if the rotary tilling device 4 rises, the rotary tilling device 4 rises in parallel. The lower end of the mudguard sheet 19 slightly rises compared to when the rotary tilling device 4 is at the position at the time of the tilling operation, but remains at a position relatively close to the ground. Therefore, in the conventional cultivator of the type in which the handle 22 is lifted up during rotation and the rotary tilling device 4 is raised, if the work clutch is forgotten to be disengaged and the vehicle is moved backward, the soil is thrown up to the operator side, as in the present invention. If the work clutch is forcibly disengaged, the rear side is not opened even if the operator forgets to disengage the work clutch, so that the jumped-up soil hits the mudguard sheet and does not hit the operator.

Next, the handle 22 will be described. An upper roller 65a provided on a hitch on the rotary tilling device 4 side and a rod 24 erected on the handle front end 22a, the rotary tilling device 4 and the handle 2
The rotary tilling apparatus 4 is configured to move up and down in conjunction with the vertical rotation of the handle 22.
The handle 22 pivots up and down around a handle pivot shaft 20 that is laterally laid on the handle base 21. A rotation restricting mechanism 69 shown in FIG. 6 is provided on the handle rotation shaft 20 (rotation operation unit).

The rotation restricting mechanism 69 is mounted on the handle base 21.
And comprises a rotation restricting member 70 and a locking member 68. The rotation restricting member 70 includes a boss 70d fixed to the handle rotation shaft 20 and a sector plate 70e fixed to the boss 70d. Handle turning shaft 20
Is rotatably supported by a handle base 21, and the handle rotation shaft 20 and the handle 22 are fixed. A plurality of notches 70a are formed on the arc of the fan-shaped plate 70e.
70b and 70c are provided. These notches 70a
The rotation of the handle 22 is restricted and the position of the handle 22 is maintained by engaging a locking member 68 fixedly mounted inside the handle base 21 which is a mounting portion of the handle 22 with 70b and 70c. It has a configuration.

The locking member 68 is configured to slide substantially forward and backward, and is urged rearward by an urging member. One end of a cam 49 is rotatably connected to the front end of the locking member. The cam 49 is formed in a bell crank shape, the center of which is pivotally supported by a pin protruding from the handle base 21, and an operation wire 48 is connected to the other end of the cam 49. The operation wire 48 is connected to an operation lever (not shown) provided on the handle 22, and when the operation lever is pulled, the operation wire 48 is pulled rearward and the cam 4 is moved.
9 rotates, the locking member 68 slides forward, and comes out of the notches 70a, 70b, 70c of the rotation restricting member 70.
Therefore, when the handle 22 is rotated, the locking member 68 is slid forward as described above, and then the handle 22 is rotated and adjusted to an appropriate position.
Is slid rearward, the rotation of the handle 22 is fixed.

Of the notches 70a, 70b, 70c, the one located at the lowest position is the notch (70b) which engages with the locking member 68 when the handle 22 is lowered, and is also located at the uppermost position. Is a notch (70a) that engages when the handle 22 is raised up. A plurality of notches 70c and 70c are also provided between the notches (70a and 70b) at the time of raising and lowering.
70c are provided so that the position of the handle 22 can be adjusted. Therefore, since the handle 22 is connected to the rotary tillage device 4 as described above, the height of the handle 22 and the height of the rotary tillage device 4 can be reduced by providing a plurality of notches 70a, 70b, and 70c in the rotation restricting member. It is adjustable.

Here, the assist device will be described with reference to FIG. An arm 65d provided on the sliding body 65 of the hitch 13 projects forward from the rail 63, and is provided at an upper end 6 of a gas spring 62 as an assist device.
2a is fixed. In the cultivator 30 according to the present invention,
When the handle 22 is pushed down, the hitch 13 on the rotary tilling device 4 rises, that is, the rotary tilling device 4 is raised. However, the rotary tilling device 4 is heavy, and therefore, a large force is required to push down the handle 22. It is said. Therefore, in order to reduce the force for pushing down the handle 22, the gas spring 62 is used in this embodiment as an assist device for assisting the force for pushing up the rotary tillage device 4 in the ascending direction. Note that an electric actuator, a spring, or the like may be used as the assist device.

The lower end of the gas spring 62 is fixed to the hitch 13 on the machine body 1 side fixed to the transmission case 3, and the upper end is fixed to the hitch 13 on the rotary plow 4. Therefore, the hitch 13 on the rotary tilling apparatus 4 side is urged upward by the extension of the gas spring 62. The gas spring 62 is always provided with an urging force in a direction in which the gas spring 62 is extended, so that the gas spring 62 is not provided with an urging force enough to lift the rotary tillage device 4, and is configured so as not to rapidly expand. Therefore, the rotary tiller 4 can be moved up and down with a small force.

Next, the lifting link mechanism will be described.
As shown in FIG. 1, a parallel link 40 is formed in the rotary tilling device 4, and the rotary tilling device 4, the handle 22, and the tail wheel 46 are linked by the parallel link 40. The parallel link 40 is composed of upper and lower two links of an upper link 41 and a lower link 42 extending in the front-rear direction, a beam 18 and a plate 45 described later, and the upper link 41 and the lower link 42 are curved downward at a rear portion thereof. And it is comprised in the shape of "he" in side view.

The front end of the upper link 41 is rotatably supported by a bracket 18a protruding from the upper surface of the beam 18, and the rear end is rotatably supported by an upper portion of a plate 45 protruding rearward from the tail wheel 46. Have been. A connecting link 4 is provided between the middle of the upper link 41 and the rear end of the arm 23 projecting rearward from the lower portion of the handle 22.
4 is rotatably mounted. A front end of the lower link 42 is rotatably supported on the side surface of the beam 18, and a rear end of the lower link 42 is rotatably supported by a lower portion of a plate 45 projecting rearward from the tail wheel 46.

The tail wheel 46 is located substantially at the center of the rear end of the fuselage on the left and right sides, and a tail wheel support rod 47 having the tail wheel 46 at the lower end is provided at the rear end of the beam 18 as shown in FIG. A guide 18b extending in the vertical direction is slidably supported in a substantially vertical direction. The tail wheel support rod 47 has a double structure of an inner cylinder 47b and an outer cylinder 47a, and the inner cylinder 47b is rotatable with respect to the outer cylinder 47a. Therefore, the outer cylinder 47
a is substantially vertically slidable on a guide 18b of the tilling case 31, the inner cylinder 47b is vertically slidable with respect to the outer cylinder 47a, and a handle shaft 29a is screwed on the upper part of the inner cylinder 47b. The handle 29 is provided at the upper end of the handle shaft 29a, and the tail wheel 46 can be moved up and down by rotating the handle 29. The tail wheel 46 changes its traveling direction freely in response to the movement of the wheels 12, 12, so that the aircraft is supported at the rear of the aircraft.

Further, the tail wheel support rod 47 is provided with a plate 45 projecting rearward. As described above, the rear end of the parallel link 40 is rotatably supported by the plate 45, and thus constitutes one of the components of the parallel link 40. Then, with the movement of the parallel link 40, the plate 45 moves up and down,
The tail wheel support rod 47 and the tail wheel 46, which move together with the plate 45, move up and down substantially while sliding on the guide 18a at the rear end of the beam 18.

In the cultivator 30 configured as described above,
Changes in the attitude of the aircraft during tilling work and traveling will be described. As shown in FIG. 8, during the tilling work, the handle 22 is located above the work position (79a), and the operator moves forward with the body while grasping the handle 22. At this time, the tail wheel 46 is in the raised position.

If the tilling claws 17... 17 are kept down on the ground during turning or running of the machine body, the tilling claws 17. Must be lifted upwards. During this turning, as shown in FIG.
Rotates downward about the handle rotation shaft 20. Then, the rod 24 provided at the front end of the handle 22 moves upward. When the rod 24 moves upward, the sliding body 65 of the hitch 13 connected to the lower end of the rod 24 moves upward on the rail 63. At this time, the sliding body 65
The gas spring 62 connected to the slide member operates in a direction to extend upward, and pushes up the sliding body 65 upward. Therefore, the operator can push down the handle 22 with relatively light force. Thus, the handle 22 is pushed down until the engaging member 68 provided on the handle base 21 engages with the notch 70b of the rotation restricting member 70 provided on the handle rotating shaft 20 (79b).

When the handle 22 is pushed down as described above, the hitch 13 connected to the handle 22 by the rod 24 rises substantially vertically, so that the rotary tilling device 4 rises substantially vertically. Many conventional walking tillers have a configuration in which the rotary tiller 4 is lifted by the operation of lifting the handle 22.
2, the load of the rotary tilling device 4 is applied, and the operator must lift the handle 22 against the load. In particular, when soil or the like adheres to the tilling case 31, the lifting load of the handle 22 further increases, This work,
The work was painful for medium and large tillers. But,
In the cultivator 30 according to the present invention, the rotary tilling device 4 is raised by pushing down the handle 22, and the direction in which the force is applied is opposite to that of the conventional cultivator. Further, the load borne by the operator is reduced by the gas spring 62 as an assist device.

A working clutch (or main clutch)
An interlocking means is provided between the rotary tilling device 4 and the work implement or the elevating link mechanism so that when the rotary tilling device 4 moves up, the work clutch (or the main clutch) is disengaged. That is, a traction device 43 composed of a wire or the like is provided between the clutch lever 39 and the arm 23. When the rotary tilling device 4 is raised, the clutch lever 39 is automatically operated in the “off” direction, and the chain case The rotary clutch 25 provided in 26 is turned off. That is, at the same time as the rotary tilling device 4 is lifted, the transmission of power to the tilling claw shaft 16 is cut off, and the tilling claw 17.
The rotation of 17 stops. However, the interlocking means is not limited to a wire, but may be a link, a cam, an electric switch, an actuator, or the like. The interlocking target is not limited to the clutch lever 39, but may be a work clutch arm or a main clutch. For example, a tension arm may be used, and the handle 22 may be used instead of the arm 23. When the rotary tilling device 4 is raised, it is running and turning, and not during tilling work, so that when the tilling claws 17,... 17 are rotationally driven, the soil jumps or breaks the ridge. It is. Accordingly, the rotary tilling device 4 is raised and the rotary clutch 25
Is turned off, which is convenient in terms of safety.

When the rotary tilling device 4 is raised, the parallel link 40 supported by the beam 18 is also raised. On the other hand, the middle part of the upper link 41 constituting the parallel link 40 is provided below the handle 22. It is connected to the arm 23 by a connection link 44. The distance between the arm 23 and the beam 18 is reduced by the rise of the rotary tilling device 4, and the upper link 41 receives a force pushed down by a connecting link 44 in the middle of the upper link 41.

When the upper link 41 is pushed down, the plate 45 provided on the tail wheel 46, which is also a component of the parallel link 40, is pushed down. Plate 4
When the wheel 5 is pushed down, the tail wheel 46 slidably provided up and down on the tilling case 31 is pushed down.
In other words, the connecting link 4 attached to the body of the body
Assuming that the lower end of 4 is the fulcrum,
The rear portion of the upper link 41 is pushed down, and the tail wheel 46 squeezes against the ground, so that the rotary tilling apparatus 4 is relatively lifted.

As described above, since the rotary tilling device 4 is raised and the tail wheel 46 is lowered, the ground and the tilling claw 1 are lowered.
There is a large distance between 7 ... 17. Therefore, the lifting width is smaller than lifting only the rotary tilling device 4, and the movement of the body is small.

By changing the configuration of the parallel link 40, the handle 22 can be lifted to raise the rotary tillage device 4.

Next, a second embodiment according to the present invention will be described. The cultivator 30 according to the first embodiment described above raises the rotary cultivator 4 by an operation of pushing down the handle 22. However, as shown in FIG.
Reference numeral 0a is characterized in that the rotary tilling apparatus 4 is raised and lowered by forming two upper and lower parallel links 33 and 34 and using a lifting lever 75.

First, the connection between the rotary tilling apparatus 4 and the body 2 of the second embodiment will be described. The hitch 13 as a connecting portion between the rotary tilling device 4 as a working machine and the body 2 has the same form as the hitch described in the first embodiment, except that the upper roller 65a of the sliding body 65 is provided.
No rod is provided. The rotary tillage device 4
Is connected to the rear of the body 1 by a hitch 13 provided behind the engine stand 5 and the transmission case 3. The hitch 13 is configured such that the hitch on the rotary tilling apparatus 4 side can be raised and lowered in the horizontal direction with respect to the hitch on the body body 1 side. As shown in FIG.
The hitch 13 on the side includes a bracket 61 attached rearward to the right side of the side of the transmission case 3, and the bracket 61
And a rail 63 fixed to the rear end and extending vertically. Accordingly, the position of the hitch 13 on the side of the body 1 is fixed with respect to the body 1.

On the other hand, the hitch 13 on the rotary tiller 4 side
Is composed of a bracket 64 fixed to the rotary drive case 14 and a sliding body 65 screwed to the bracket 64. The sliding body 65 includes a plate 65e on which the bracket 64 is screwed, upper and lower rollers 65a and 65b fitted on the rail 63, and an assist device (6
2) It is composed of an arm 65d supporting one end. The sliding body 65 is configured to be slidable on rails 63 provided on the hitch 13 of the body 1 by rollers 65a and 65b.

Next, the lifting link mechanism will be described.
As shown in FIG. 10, the rotary tillage device 4 includes two upper and lower parallel links 33 and 34 of an upper parallel link 33 and a lower parallel link 34, and the rotary tiller 4 is formed by these parallel links 33 and 34. And the movement of the lifting lever 75 and the tail wheel 46 are linked.

First, the upper parallel link 33 will be described. The upper parallel link 33 includes a link 44 whose upper end is rotatably supported at the rear end of the arm 23 that projects rearward from the lower portion of the handle 22, an upper link 41 that is a component of the lower parallel link 34, and an upper surface of the beam 18. A link 74 whose lower end is rotatably supported by the bracket 18a protruding from the arm 23, and a link 73 whose rear end is rotatably supported by the rear end of the arm 23 (44, 41, 74.7).
3).

Of the links constituting the upper parallel link 33, a link whose rear end is supported by the rear end of the arm 23 is a drive link 73. As shown in FIG. Connected.

A lever rotation shaft 23 is provided at the rear end of the arm 23.
a on the lever rotating shaft 23a.
The fifth boss 35f is rotatably fitted. As shown in FIG. 13, the rotation restricting member 35 includes a lever fitting cylinder 35e for fixing a lifting lever 75 to a cylindrical boss 35f extending in the left-right direction, and a notch for restricting rotation of the lifting lever 75. A fan-shaped cam 35g provided with 35a, 35b, and 35c is integrally provided. An elevating lever 75 is fitted into the lever fitting cylinder 35e and fixed by a fixing member. On the other hand, as shown in FIG. 12, the cam 35g fixes the drive link 73 at the left end. Therefore, the cam 35g and the lever fitting cylinder 35e rotate integrally about the lever rotation shaft 23a, and their relative angles are fixed by the rotation restricting member 35. Since the lifting operation lever 75 and the drive link 73 are configured to interlock as described above, when the lifting operation lever 75 is rotated backward, the drive link 73 rotates upward, and accordingly,
The upper link 41, which is a component of the lower parallel link 33 and the upper parallel link 33, and the rotary tilling device 4 that supports one end of the upper parallel link 33 slide upward.
Similarly, when the lifting operation lever 75 is rotated forward, the drive link 73 is rotated downward, and the upper link 41 and the rotary tilling device 4 are slid downward.

The rotation range of the lift lever 75 is restricted by a rotation restricting mechanism 36 provided in a rotation operation section described below. As shown in FIG. 14, the rotation restricting mechanism 36 is provided on the arm 23 projecting rearward from the handle base 21 and includes a rotation restricting member 35, a locking member 37 and the like. A plurality of notches 35a, 35b, 3 are formed on the circular arc of the fan-shaped cam 35g of the rotation restricting member 35 connecting the lifting lever 75 and the drive link 73.
5c is provided. These notches 35a, 35b,
The rotation of the elevating lever 75 is restricted by locking the locking member 37 fixed to the arm to the arm 35c, and the position of the rotary tilling device 4 is also restricted.

The locking member 37 is configured to slide substantially forward and backward, and is urged rearward by an urging member. A cam 38a is rotatably connected to the front end of the locking member, and an operation wire 38b is connected to the opposite side of the rotation center of the cam 38a. The operation wire 3
8b is connected to an operation lever (not shown) provided on the handle 22. When the operation lever is pulled, the operation wire 38b is pulled backward, the cam 38a rotates, and the locking member 37 slides forward. The notch 35a of the rotation regulating member 35
・ Exit from 35b ・ 35c. Therefore, the lifting lever 7
To rotate 5, the locking member 37 is slid forward as described above, then the elevating lever 75 is rotated to an appropriate position, and the sliding member 37 is slid rearward. When moved, the lift lever 75 is fixed in its rotation.
The upper and lower ends of the cam 35g of the rotation restricting member 35 protrude forward so as to come into contact with the guide 37a in which the locking member 37 is fitted, so that the lifting lever 75 does not rotate excessively.

Of the notches 35a, 35b and 35c, the one located at the bottom is the notch (35b) which engages with the locking member 37 when the elevating lever 75 is lowered, and is also located at the top. This is a notch (35a) that is engaged when the lifting lever 75 is raised up. A plurality of notches 35 are also provided between the notches (35a and 35b) at the time of raising and lowering.
are provided, and a lifting operation lever 75 is provided.
The position of can be adjusted. Therefore, since the lifting lever 75 is connected to the rotary tillage device 4 via the parallel links 33 and 40, the notch 35a is formed in the rotation restricting member.
By providing a plurality of 35b and 35c, the lifting lever 75
That is, the rotation of the rotary tilling device 4 can be controlled at several pitches, that is, the height of the rotary tilling device 4 can be adjusted.
Therefore, the plowing depth of the soil plowed by the rotary plow 4 can be set before the work.

Next, the lower parallel link 34 will be described. As shown in FIG. 10, the lower parallel link 34 is a plate 45 attached to the upper and lower two links of the upper link 41 and the lower link 42 extending in the front-rear direction, the beam 18 and the tail wheel support rod 47, The link 41 and the lower link 42 are curved downward at a rear portion thereof, and are formed in a U-shape in a side view.

The front end of the upper link 41 is rotatably supported by a bracket 18a projecting from the upper surface of the beam 18, and the rear end is similarly rotatably supported by an upper portion of a plate 45 projecting rearward from the tail wheel 46. Have been. Further, from the middle part of the upper link 41 to the front is also a constituent member of the upper parallel link 33, and accordingly, the upper link 4
1, the movement of the upper and lower parallel links 33 and 34 is linked. Further, the front end of the lower link 42 is
The rear end is also rotatably supported by a lower portion of a plate 45 projecting rearward from the tail wheel 46.

A description will now be given of the change in the attitude of the machine body during the tilling operation and during traveling in the cultivator 30a configured as described above. As shown in FIG. 15, at the time of tilling work, the tail wheel 46 is lifted and the tilling claws 17 tilling the field.

When the lift lever 75 is rotated backward as shown in FIG.
Drive link 73 rotates upward. One end of the upper parallel link 33 is connected to the beam 18 of the rotary tiller 4.
The rotary tilling device 4 starts to slide upward with the rotation of the drive link 73 because it is supported above. At this time, the gas spring 62 connected to the sliding body 65 of the hitch 13 on the rotary tilling apparatus 4 operates in the direction in which it is pulled upward and extends, and pushes the sliding body 65 upward. Therefore, the operator can relatively easily turn the lifting lever 75 backward without applying a large force. Thus, in the rotation restricting mechanism 36 provided on the arm 23 projecting below the handle 22, the rotation restricting member 3
The raising / lowering operation lever 75 is rotated until the engagement member 37 is engaged with the lowermost notch 35b of the lever 5.

When the raising / lowering operation lever 75 is rotated backward as described above, the slide 63 rises substantially vertically because the rail 63 of the hitch 13 extends substantially vertically, that is, the rotary tilling device 4 is moved substantially vertically. To rise. Many conventional walk-type cultivators have a configuration in which the rotary tilling device 4 is lifted by the operation of lifting the handle 22. At this time, the load of the rotary tilling device 4 is applied to the handle 22, and the operator turns the handle 22 against the load. In particular, when soil or the like adheres to the tilling case 31, the lifting load of the handle 22 further increases, and this operation has been a painful operation for medium and large cultivators. However, in the cultivator 30a according to the present invention, when the elevating lever 75 is rotated, the gas spring 62, which is an assist device, is operated to bear the force for lifting the rotary tilling device 4, thereby reducing the load borne by the operator. ing.

When the rotary tilling device 4 rises, the lower parallel link 34 supported by the beam 18 also rises, but the middle part of the upper link 41 constituting the lower parallel link 34 moves downward from the arm 23. Since it is connected to the link 44 which is a component of the extending upper parallel link 33, the distance between the arm 23 and the beam 18 is reduced by the rise of the rotary tilling device 4, and the upper link 4
1 receives a force which is pushed downward by the link 44 in the middle of the upper link 41.

When the upper link 41 is pushed down, the plate 45 provided on the tail wheel 46, which is also a component of the lower parallel link 34, is pushed down. When the plate 45 is pushed down, the tail wheel 46 slidably provided up and down on the beam 18 is pushed down, and the lower end of the tilling claw 17 shown in FIG. 16 can be raised by a height 96 from the ground surface.

Next, a third embodiment according to the present invention will be described. The tilling machine 30 according to the first embodiment described above raises the rotary tilling device 4 as a working machine by an operation of pushing down the handle 22. On the other hand, as shown in FIG. The machine 30b is characterized in that the rotary tillage device 4 is moved up and down by the actuator 50.

Here, the actuator 50 for raising and lowering the rotary plow 4 will be described. In the third embodiment, an electric actuator is employed as the actuator 50. However, the present invention is not limited to this, and an actuator using the power of an engine or an actuator using an elastic force such as a spring may be used.

The actuator 50 provided on the handle base 21 is electrically driven and includes an arm 50a extending substantially vertically, and a lower end 50b of the arm 50a.
Is fixed to the front of the beam 18. Although the mounting position of the actuator 50 is not limited to the present embodiment, the center of gravity of the rotary tilling device 4 is
The arm 50 a of the actuator 50 is preferably attached to a position as close as possible to the center of gravity of the rotary tilling device 4, because it is near the joint between the rotary drive case 14 and the beam 18 with 6.

The actuator 50 includes a handle 22
Arm 5 by an elevating switch (not shown)
The configuration is such that the degree of expansion / contraction of Oa can be controlled in a stepwise manner, that is, the height of the rotary tilling device 4 can be adjusted. Therefore, even before the tilling operation is started, the tilling depth can be adjusted, so that the target of the tilling depth is easy to set, and the test tilling operation for adjusting the tilling depth is not required, so that the workability is improved. is there.

A description will be given of the change in the attitude of the machine body during the tilling operation and the running in the cultivator 30b configured as described above. As shown in FIG. 18, at the time of tilling work, the tail wheel 46 is raised, and the tilling claws 17 tilling the field.

As shown in FIG. 19, when the elevator switch (not shown) provided on the handle 22 is operated at the time of turning, the actuator 50 is operated and the arm 50a of the actuator 50 is contracted. Lifted up. At this time, the arm 50a of the actuator 50 expands and contracts in a substantially vertical direction, and the rail 63 of the hitch 13 is provided in a substantially vertical direction, and the sliding body 65 slides in a substantially vertical direction. It rises almost vertically.

In the conventional walk-type cultivator, the rotary tilling device 4 is a heavy object, so that the lifting load of the handle 22 is large. However, in the cultivator 30b according to the present invention,
Rotary tilling device 4 using electric actuator 50
Is lifted, the operator simply operates the lifting switch for controlling the electric actuator 50, and the rotary tilling device 4 rises and does not require a large force. Therefore, the rotary tilling device 4 can be easily raised and lowered even with a weak force. Since the operation can be performed and the handle 22 does not need to be lifted, the balance of the body is not lost, thereby improving safety.

When the rotary tilling apparatus 4 is raised, the parallel link 40 supported by the beam 18 is also raised. On the other hand, the middle part of the upper link 41 constituting the parallel link 40 is provided below the handle 22. It is connected to the arm 23 by a connection link 44. The distance between the arm 23 and the beam 18 is reduced by the rise of the rotary tilling device 4, and the upper link 41 receives a force pushed down by a connecting link 44 in the middle of the upper link 41.

When the upper link 41 is pushed down, the plate 45 provided on the tail wheel 46, which is also a component of the parallel link 40, is pushed down. Plate 4
When the 5 is pushed down, the tail wheel 46 slidably provided up and down on the beam 18 is pushed down.

As described above, since the rotary tilling device 4 is raised and the tail wheel 46 is lowered, the ground and the tilling claw 1 are lowered.
There is a large distance between 7 ... 17. In other words, a lifting width smaller than lifting only the rotary tilling device 4 is sufficient, and the movement of the airframe is small. In addition, the operator moves the rotary tilling device 4 up and down by operating the switch at hand without applying force, so that the operator does not apply force to the body, so that the movement of the body is small, and accordingly, the movement of the center of gravity of the body is small, By moving the center of gravity, the steering wheel 22 can be steered stably without losing the balance. In the case of the second embodiment and the third embodiment, since the height of the handle 22 does not change even when the working machine is raised and lowered, the same posture is attained during running and working, and steering operation and the like can be easily performed.

[0067]

As described above, the present invention has the following advantages.

That is, according to the first aspect of the present invention, in a walking cultivator in which a working machine is mounted on a rear portion of a body of a machine, a handle and a working machine are interlocked via a lifting link mechanism, and the handle is rotated by pushing down the handle. Since the work implement is configured to be raised, the work implement is raised in conjunction with the pushing down of the handle, so that the work implement can be moved up and down by one operation, thereby simplifying the operation. In addition, raising the work implement by pushing down the handle means that the direction of force input is opposite to that of a conventional walking type cultivator that lifts the work implement by lifting the handle, and that pushing down is more powerful than lifting up. Is easy to add,
Further, the load borne by the operator is reduced by the assist device.

According to a second aspect of the present invention, an assist device is provided at a connecting portion between the machine body and the working machine for reducing a handle pushing load, so that a relatively heavy rotary tiller can be easily lifted. You can do it.

According to a third aspect of the present invention, in a walking type cultivator in which a working machine is mounted on a rear portion of a body of a machine, a handle and a working machine are interlocked via a lifting link mechanism, and a lifting lever is connected to the lifting link mechanism. Since the working machine is lifted and lowered by rotating the lifting lever, the tilling claw and the tilling case rise while maintaining the posture at the time of the tilling work, so that the angle of the tilling case does not change, and the tilling claw does not change. The tilling claws are not exposed, so there is no danger of the tilling claws being exposed and caught in the rotary tilling device that is rotated up and down, contributing to improved safety. It is. Further, since it is not necessary to raise the steering wheel, the operation of lifting the steering wheel, which requires a relatively large force, can be omitted, and the burden on the operator can be reduced.

According to a fourth aspect of the present invention, the rotation operation mechanism is provided with a rotation restricting mechanism, so that the position of the rotary tillage device can be restricted by restricting the position of the elevating lever. The workability can be improved by changing the height of the device or setting the tilling depth of the soil by the rotary tilling device before the work.

According to a fifth aspect of the present invention, in a walking cultivator in which a working machine is mounted on a rear portion of a body of a machine, a handle and a working machine are interlockingly connected via a lifting link mechanism, and a lifting actuator is provided between the handle and the working machine. The operator can operate the actuator with a simple operation, and the rotary tilling device moves up and down.By using an electric actuator, the extension width of the arm can be easily changed. The tilling depth can be adjusted even before the work is started, and fine adjustment of the tilling depth at the time of the tilling work can be easily performed. In addition, since the lifting and lowering of the rotary tilling device can be operated without applying force regardless of the load of the rotary tilling device, the burden on the operator is reduced, and the balance is lost even when the relatively heavy rotary tilling device is raised and lowered. It is difficult.

[Brief description of the drawings]

FIG. 1 is an overall side view of a walking type cultivator according to a first embodiment.

FIG. 2 is a transmission path diagram.

FIG. 3 is a cross-sectional plan view of the same chain case.

FIG. 4 is a side view showing elevation of the hitch.

FIG. 5 is a side view of the hitch.

FIG. 6 is a partial cross-sectional side view showing a handle rotation restricting mechanism.

FIG. 7 is a partial side sectional view of a tail wheel.

FIG. 8 is a side view showing a rear portion of the machine body during tilling work of the walking type cultivator according to the first embodiment.

FIG. 9 is a side view showing the rear part of the aircraft during traveling.

FIG. 10 is an overall side view of a walking-type cultivator according to a second embodiment.

FIG. 11 is a side view of the hitch.

FIG. 12 is a side view showing the upper link.

FIG. 13 is a plan view of the rotation restricting member.

FIG. 14 is a partial cross-sectional side view showing the mechanism for restricting the rotation of the elevating lever.

FIG. 15 is a side view showing the rear part of the machine body during tilling work of the walking type cultivator according to the second embodiment.

FIG. 16 is a side view showing the rear part of the aircraft during traveling.

FIG. 17 is an overall side view of a walkable cultivator according to a third embodiment.

FIG. 18 is a side view showing the rear part of the machine body during the tilling operation.

FIG. 19 is a side view showing the rear part of the aircraft during traveling.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Airframe main body 4 Rotary tilling device (working machine) 13 Hitch (connecting tool) 18 Beam (tail wheel support rod) 22 Handle 25 Rotary clutch (working clutch) 30 (30a / 30b) Walking cultivator 40 Parallel link 41 Upper link 42 Lower link 43 Checking device 44 Connecting link 46 Tail 50 Actuator 62 Assist device 63 Sliding rail 75 Lifting lever

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shoji Teramoto 428 Enami, Okayama City Seirei Industrial Co., Ltd. In-house F-term (reference) 2B304 KA08 LA01 LA06 LB05 LB12 PA02 PA11 PA12 PC06

Claims (5)

[Claims] 1. A walk-behind cultivator having a working machine mounted on a rear portion of a body of a machine, wherein a handle and a working machine are interlocked and connected via an elevating link mechanism, and the working machine is raised by a rotating operation of pushing down the handle. The lifting and lowering mechanism of the work machine of the cultivator. 2. The tilling machine working machine lifting / lowering mechanism according to claim 1, wherein an assist device for reducing a handle pushing-down load is provided at a connecting portion between the machine body and the working machine. 3. A walking type cultivator having a working machine mounted on a rear portion of a body of a body, wherein a handle and a working machine are interlocked via a lifting link mechanism, and a lifting lever is connected to the lifting link mechanism. A work implement lifting / lowering mechanism for a cultivator, wherein the work implement is raised / lowered by a rotation operation of a cultivator. 4. The cultivator working machine elevating mechanism according to claim 1, wherein a rotation restricting mechanism is provided in the rotation operation unit. 5. A walking cultivator in which a working machine is mounted on a rear portion of a body of a machine, wherein a handle and a working machine are interlocked and connected via a lifting link mechanism, and a lifting actuator is disposed between the handle and the working machine. A feature of the tiller working machine lifting mechanism.