JP7313311B2 - Ride-on grooving machine - Google Patents

Description

The present invention relates to a riding groover.

Hitherto, there has been known a riding ditch cutting machine that cuts a ditch in an agricultural field (paddy field) in order to quickly drain the water. In this riding grooving machine, an operator sits astride a seat provided on the main body frame, and the grooving section at the rear of the main body frame cuts a ditch in the field while the machine advances by the rotation of the wheels driven by the engine. Patent Literature 1 below describes a device that steers wheels to change the traveling direction by a steering wheel operation by an operator.

Patent No. 4032109

However, in the riding grooving machine described in Patent Document 1, it may be difficult to return the handle to the neutral position (neutral position around the rotation axis of the handle; straight forward position) depending on the field when the handle is turned or the handle is removed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a riding grooving machine in which the wheel steering handle can be easily returned to the neutral position and which can maintain stable straight running.

A riding grooving machine (100) according to the present invention is a riding grooving machine (100) in which an operator sits on a seat (12) provided on a body frame (9) and cuts a groove by means of a grooving part (7) while advancing with the rotation of a wheel (6). and the rotary bracket (31) are connected via elastic bodies (25a, 25b) that pull the handle shaft (2) and the rotary bracket (31) toward the neutral position around the rotation axis.

According to such a riding grooving machine (100), when the handle shaft (2) of the handle (1) rotatably connected to the body frame (9) having the seat (12) is cut from the neutral position, the rotating bracket (31) and the handle shaft (2) are pulled toward the neutral position by the elastic bodies (25a, 25b) connecting the rotating bracket 31 and the handle shaft (2), which are rotatably connected to the body frame (9). 1) can be easily returned to the neutral position and can maintain stable straightness.

Here, if the elastic bodies (25a, 25b) are provided on both the left and right sides of the straight line connecting the rotation axes of the handle shaft (2) and the rotation bracket (31) in plan view, the handle (1) can be easily returned to the neutral position even when the handle (1) is turned left or right.

In addition, the handle axis (2) is connected to the front of the body frame (9), the rotation bracket (31) is connected to the rear of the main body frame (9), and when the rotation bracket (31) is fixed, the phase whose handle shaft (2) has rotated, and the phase of the phase where the groove part has rotated. Because the wheel (6) and the grooving portion (7) face the opposite direction, the rotation radius and the inner ring difference can be reduced, and a small turn can be used.

Here, specifically, as a configuration that favorably exhibits the above-described action, a motor (15) that imparts driving force to the wheels (6) and a transmission shaft that transmits the driving force of the motor (15) to the wheels (6) are connected to the handle shaft (2). 5a, 25b) are provided between the transmission shaft housing pipe (13) housing the transmission shaft and the rotary bracket (31).

In addition, if a handle shaft rotation range restricting means (17) for restricting the rotation range of the handle shaft (2) is provided, the rotation range of the handle (1) is restricted, so interference with parts due to excessive cutting of the handle (1) and excessive load can be suppressed.

As described above, according to the present invention, it is possible to provide a ride-on grooving machine in which the handle can be easily returned to the neutral position and stable straightness can be maintained.

1 is a side view showing a riding grooving machine according to an embodiment of the present invention; FIG. Fig. 2 is a schematic perspective view of the riding grooving machine shown in Fig. 1 as seen from the rear upper side; FIG. 3 is a vertical cross-sectional view showing the handle, the handle shaft, and the handle shaft rotation range restricting means in FIGS. 1 and 2, and showing the case where the handle is fixed. 4 is a plan view showing an upper plate and a knob bolt that constitute the handle shaft rotation range restricting means in FIG. 3; FIG. 4 is a plan view showing a middle plate that constitutes the handle shaft rotation range restricting means in FIG. 3. FIG. 4 is a plan view showing a lower plate that constitutes the handle shaft rotation range restricting means in FIG. 3. FIG. It is a partial cross-sectional side view which shows the grooved part in FIG. 1, a grooved part rotation range control means, and a neutral return mechanism. FIG. 8 is a plan view showing a neutral return mechanism in FIG. 7; FIG. 8 is a view taken along line IX-IX in FIG. 7; FIG. 8 is a rear view showing a groove cut portion rotation range restricting means in FIG. 7; FIG. 4 is a plan view showing the phase relationship between the wheel and the grooved portion, and shows a state in which the wheel and the grooved portion are positioned at a neutral position; FIG. 4 is a plan view showing the phase relationship between the wheel and the grooved portion, and shows the state in which the wheel is rotated clockwise from the neutral position. FIG. 4 is a plan view showing the phase relationship between the wheel and the grooved portion, and shows the state in which the wheel is turned counterclockwise from the neutral position.

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of a riding groover according to the present invention will be described below with reference to the accompanying drawings. 1 and 2 are views showing a riding grooving machine according to an embodiment of the present invention, FIG. 3 is a vertical cross-sectional view showing a handle, a handle shaft and a handle shaft rotation range restricting means in a case where the handle is fixed, FIGS. 4 to 6 are views showing the handle shaft rotation range restricting means, FIG. FIG. 10 is a rear view showing the grooving portion rotation range restricting means, and FIGS. 11 to 13 are plan views showing the phase relationship between the wheel and the grooving portion. In the following description, terms such as "front", "rear", "up", "down", "left", and "right" are based on the forward direction when the riding grooving machine is placed on a horizontal plane.

As shown in FIGS. 1 and 2, a riding grooving machine 100 has a handle 1 gripped by an operator, a handle shaft 2 extending obliquely downward and forward from the lower portion of the handle 1, a connecting bracket 3 connected to the lower end of the handle shaft 2 and offset to the front side of the paper surface and extending downward at the same inclination as the handle shaft 2, a gear case 4 connected to the connecting bracket 3, and flat plate-shaped anti-slips 5 connected to the hub inside the gear case 4 and along the circumferential direction of the outer periphery. A wheel 6 provided with a , and a grooving part 7 for cutting a ditch in a farm field and a grooving part shaft 8 connected to the grooving part 7 and extending obliquely upward and rearward are provided at its rear part.

In addition, the riding grooving machine 100 is provided with a body frame 9 extending rearwardly downward in the front-rear direction. A handle shaft rotation support pipe 10 is provided at the front portion of the body frame 9, and the handle shaft 2 is inserted into and rotatably connected to the handle shaft rotation support pipe 10. As shown in FIG.

The main body frame 9 is provided with a seat 12 on which a worker straddles and sits on the upper part of the center in the axial direction. The seat 12 is adjustable in vertical position. Further, on the rear side of the center of the body frame 9 in the axial direction, there is provided a curved portion 14 that bulges laterally (towards the back side of the paper surface) in a substantially U shape so that a transmission shaft housing pipe 13, which will be described later, enters and swings in the left-right direction (perpendicular to the paper surface) about the handle shaft 2 as the rotation axis. A grooved shaft rotation support pipe 11 is provided at the rear end portion extending rearward from the curved portion 14 of the body frame 9, and the grooved shaft 8 is inserted into the grooved shaft rotation support pipe 11 to be rotatably connected.

The grooved portion 7 has a tapered V-shape when viewed from the top, and is configured by connecting flat plates so as to form a V-shaped groove when viewed from the front and back, and a flat plate extending horizontally outward along the V-shape is connected to the upper end of the flat plate forming the V-shaped groove. When grooving by the grooving section 7, the tip of the V-shaped groove is made to bite into the field, and the soil pushed up to the outside of the V-shaped groove is spread to the left and right.

The gear case 4 accommodates a curved bevel gear or the like, and is connected to a transmission shaft housing pipe 13 that houses a transmission shaft therein and extends rearwardly upward in the front-rear direction. The transmission shaft housing pipe 13 extends rearward while being slightly inclined to the right (back side of the paper) by the curved bevel gear of the gear case 4 . The motor 15 is arranged behind the seat 12 , and the transmission shaft housing pipe 13 is arranged to pass under the seat 12 and inside the curved portion 14 of the body frame 9 to reach the motor 15 . The driving force of the prime mover 15 is transmitted to the hub of the gear case 4 via the transmission shaft to rotate the wheels 6 . The connection bracket 3 and the transmission shaft housing pipe 13 are connected by a reinforcing frame 29 .

As shown in FIG. 3, the handle shaft 2 is rotatably supported via a flange-type bearing (oil-free bearing) 16 housed in the handle shaft rotation support pipe 10. A handle shaft rotation range restricting means 17 for restricting the rotation range of the handle shaft 2 is provided on the front surface of the handle shaft rotation support pipe 10 and, as shown in FIGS.

As shown in FIG. 3, the handle shaft rotation range restricting means 17 includes an upper plate 18 fixed to the front surface of the handle shaft rotation support pipe 10, and a middle plate 19 and a lower plate 20 which are fixed to the front surface of the bracket portion 37 and are stacked under the upper plate 18 with a space therebetween.

As shown in FIGS. 3 and 4, a knob bolt 21 is screwed into the upper plate 18 . As shown in FIG. 5, the intermediate plate 19 is formed with an elongated hole 22 that extends in an arc shape in a plan view with the handle shaft 2 as the rotation axis. As shown in FIG. 6, the lower plate 20 is formed with a through hole 23 below the knob bolt 21 into which the tip of the knob bolt 21 can enter. Then, as shown in FIG. 3, by screwing a knob bolt 21 into the upper plate 18 and inserting the tip of the knob bolt 21 into the long hole 22 (see FIG. 5) of the middle plate 19, the handle shaft 2 and the handle 1 are made rotatable. The rotation range of the handle shaft 2 and the handle 1 is the range until the left and right ends of the elongated hole 22 of the intermediate plate 19 move and hit the tip of the knob bolt 21 .

Further, by further screwing the knob bolt 21 into the upper plate 18 and inserting the tip of the knob bolt 21 into the through hole 23 (see FIG. 6) of the lower plate 20, the handle shaft 2 and the handle 1 can be non-rotatably fixed. 3 shows the case where the handle shaft 2 and the handle 1 are fixed.

Here, in this embodiment, the tip of the knob bolt 21 does not enter the through hole 23 of the lower plate 20, but is loosely fitted in the elongated hole 22 of the middle plate 19. Referring to FIG. A lever bolt or an index plunger may be used instead of the knob bolt 21 .

Further, as shown in FIGS. 1 and 2, a neutral return mechanism 24 is interposed between the transmission shaft housing pipe 13 and the grooved shaft 8 . As shown in FIGS. 1, 7, and 8, the neutral return mechanism 24 connects the transmission shaft housing pipe 13 and the grooved shaft 8 via coil springs 25a and 25b as elastic bodies that pull each other toward the neutral position about the rotation axis. A front adjustment plate 26 extending in the left-right direction is connected to the transmission shaft housing pipe 13, and a rear adjustment plate 27 extending in the left-right direction is fixed to the grooved shaft 8 via a rotary bracket 31. A plurality of locking portions (locking holes) 28 for locking ends of the coil springs 25a and 25b are provided in the left-right direction (see FIG. 8) in the front adjustment plate 26 and the rear adjustment plate 27.

As shown in FIGS. 1 and 2, the rotary bracket 31 is formed of a flat plate in an L shape. The rotation bracket 31 has an L-shaped bottom plate 31a whose front end is fixed to the rear end of the rear adjustment plate 27, and the groove shaft 8 is fixed to the bottom plate 31a so as to penetrate therethrough.

As shown in FIGS. 2 and 8, the coil springs 25a and 25b are provided on both left and right sides of a straight line connecting the rotation axes of the handle shaft 2 and the transmission shaft housing pipe 13 in a plan view. Here, the right coil spring 25a is arranged below the front and rear adjustment plates 26 and 27, and the left coil spring 25b is arranged above the front and rear adjustment plates 26 and 27, respectively.

In addition, the locking position of the left coil spring 25b with respect to the front adjustment plate 26 is offset to the left so that the grooving portion 7 connected via the neutral return mechanism 24 to the transmission shaft housing pipe 13, which is oblique in plan view, is positioned at a neutral position facing forward in the traveling direction of the riding grooving machine 100 (aligned with the neutral position of the wheel 6), exerting a stronger pulling force than the right coil spring 25a.

As shown in FIG. 7, the grooved shaft 8 is rotatably supported via a flange type bearing (non-lubricating bearing) 36 housed in the grooved shaft rotation support pipe 11. As shown in FIGS.

The grooving portion rotation range restricting means 30 includes a bolt 32 as a protruding member that protrudes rearward from the grooving portion shaft rotation support pipe 11, and a restricting bracket 31b that forms the L shape of the rotation bracket 31 and protrudes upward.

As shown in FIGS. 2, 7, 9 and 10, the regulation bracket 31b has a recess 33 which opens upward and extends in the left-right direction, into which the bolt 32 enters. Therefore, when the grooved portion 7 and the grooved portion shaft 8 rotate, the regulation bracket 31 b rotates around the grooved portion shaft rotation support pipe 11 . The rotation range of the grooved portion 7 and the grooved portion shaft 8 is a range until the bolt 32 abuts against the left and right ends of the regulation bracket 31b forming the recess 33 when the regulation bracket 31b rotates.

When using the riding grooving machine 100 having such a configuration, an operator sits astride the seat 12 and drives the prime mover 15. The driving force of the prime mover 15 is transmitted to the gear inside the gear case 4 and the inner hub through the transmission shaft housed in the transmission shaft housing pipe 13, and the wheels 6 rotate as driving wheels.

At this time, the handle shaft 2 and the grooving shaft 8 are positioned at a neutral position around the rotation axis, and as shown in FIG. 11, the direction of the wheels 6 and the direction of the grooving portion 7 are the same, so the riding grooving machine 100 moves forward. At this time, the weight of the riding grooving machine 100 and the operator is applied to the wheels 6 and the grooving section 7, so that the grooving section 7 following the wheels 6 forms grooves in the field.

When the handle 1 is rotated while the riding grooving machine 100 is moving forward, the handle shaft 2, the connecting bracket 3, the wheel 6, the gear case 4, the transmission shaft housing pipe 13, and the motor 15 rotate about the rotation axis of the handle shaft 2. For example, when the steering wheel 1 is turned to the right, the wheels 6 turn to the right as shown in FIG. Further, for example, when the steering wheel 1 is turned to the left, the wheels 6 turn to the left as shown in FIG. 13, and the traveling direction of the riding groover 100 is changed to the left.

At this time, since the grooved shaft 8 is connected to the transmission shaft receiving pipe 13 via the neutral return mechanism 24 having the coil springs 25a and 25b, the grooved portion 7 rotates counterclockwise around the rotational axis of the grooved shaft 8 when the handle 1 is turned to the right as shown in FIG. 12, and rotates clockwise as shown in FIG. 13 when the handle 1 is turned to the left. That is, the phase in which the handle shaft 2 rotates and the phase in which the grooving portion 7 rotates are in opposite phases, and the riding grooving machine 100 moves with the wheels 6 and the grooving portion 7 facing in opposite directions.

In this state, the neutral return mechanism 24 acts so that the operating direction of the handle 1 does not stay as it is, and the coil springs 25a and 25b rotate the handle 1 and the grooved portion 7 in the reverse direction to return to the neutral position.

As described above, according to the present embodiment, when the handle shaft 2 of the handle 1 rotatably connected to the body frame 9 having the seat 12 is cut from the neutral position, the coil springs 25a and 25b as elastic bodies connecting the rotation bracket 31 (grooved portion 7) rotatably connected to the body frame 9 and the handle shaft 2 pull the rotation bracket 31 and the handle shaft 2 toward the neutral position. can maintain progress.

In addition, since the coil springs 25a and 25b are provided on both the left and right sides of the straight line connecting the rotation axes of the handle shaft 2 and the rotary bracket 31 (grooved portion 7) in a plan view, the handle 1 can be easily returned to the neutral position even when the handle 1 is turned left or right.

In addition to the above configuration, the handle shaft 2 is rotatably connected to the front portion of the body frame 9, and the grooved portion 7 is rotatably connected to the rear portion of the body frame 9 via the rotating bracket 31. Therefore, the rotation phase of the handle shaft 2 and the grooved portion 7 can be reversed, and the wheels 6 and the grooved portion 7 are oriented in opposite directions, so that the radius of rotation and the difference between the inner rings can be reduced, and the turning radius can be reduced.

Further, since the handle shaft rotation range restricting means 17 for restricting the rotation range of the handle shaft 2 is provided, the rotation range of the handle 1 is restricted, and interference with parts due to excessive turning of the handle 1 and excessive load can be suppressed.

Moreover, according to this embodiment, the following functions and effects are also obtained. That is, by screwing in the knob bolt 21, inserting the tip portion into the through hole 23 of the lower plate 20, and fixing and locking the handle shaft 2, the grooving portion 7 is lifted while the wheel 6 is rolled while the handle 1 does not rotate.

Further, by changing the mounting positions of the coil springs 25a and 25b with respect to the engagement portion 28 of the front side adjusting plate 26 and the rear side adjusting plate 27 of the neutral return mechanism 24, the angle of the coil springs 25a and 25b can be adjusted to change the load.

The present invention has been specifically described above based on the embodiments, but the present invention is not limited to the above-described embodiments. For example, in the above-described embodiments, the grooved portion 7 has a V-shaped shape in plan view and is configured by connecting flat plates so as to form a V-shaped groove in the front-rear direction, but it may be shaped like an abacus ball.

In the above-described embodiment, the rotary bracket 31 is fixed to the grooving shaft 8 so that the grooving portion 7 is also rotated in conjunction with the handle operation. Alternatively, the groove shaft 8 may be fixed to the groove shaft rotation support pipe 11 so that the groove shaft 7 faces the forward direction, and the rotation bracket 31 may be rotatably connected to the groove shaft 8 .

DESCRIPTION OF SYMBOLS 1... Handle 2... Handle shaft 6... Wheel 7... Grooving part 8... Grooving part shaft 9... Body frame 12... Seat 13... Transmission shaft accommodation pipe 15... Prime mover 17... Handle shaft rotation range restricting means 25a, 25b... Coil spring (elastic body) 31... Rotating bracket 100... Riding grooving machine.

Claims (5)

In a riding grooving machine (100) in which an operator sits on a seat (12) provided on a body frame (9) and advances with the rotation of wheels (6), a groove is cut by a grooving part (7),
A handle shaft (2) of a steering wheel (1) for steering the wheels (6) is rotatably connected to the body frame (9), and a rotating bracket (31) is rotatably connected to the body frame (9),
A riding grooving machine (100) characterized in that said handle shaft (2) and said rotary bracket (31) are connected via elastic bodies (25a, 25b) for drawing said handle shaft (2) and said rotary bracket (31) toward a neutral position around the center of rotation. 2. The riding groover (100) according to claim 1, wherein said elastic bodies (25a, 25b) are respectively provided on both left and right sides of a straight line connecting respective rotational axes of said handle shaft (2) and said rotary bracket (31) in a plan view. The handle shaft (2) is connected to the front part of the body frame (9), and the rotating bracket (31) is connected to the rear part of the body frame (9),
3. Riding grooving machine (100) according to claim 1 or 2, characterized in that said grooving part (7) is fixed to said rotating bracket (31). The handle shaft (2) is connected to a prime mover (15) that provides a driving force to the wheels (6) and a transmission shaft that transmits the drive power of the prime mover (15) to the wheels (6),
The motor (15) is arranged behind the seat (12), and the transmission shaft is arranged to extend from the wheel (6) under the seat (12) to the motor (15),
The riding grooving machine (100) according to any one of claims 1 to 3, wherein the elastic bodies (25a, 25b) are provided between a transmission shaft housing pipe (13) housing the transmission shaft and the rotary bracket (31). The riding groover (100) according to any one of claims 1 to 4, further comprising handle shaft rotation range restricting means (17) for restricting the rotation range of the handle shaft (2).

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