JPS642568Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a single-wheel walking type rice transplanter whose body is supported by one wheel.

A single-wheel walking type rice transplanter has a structure in which the engine is located at the front and the seedling planting part and the control handle are located at the rear, with the wheels at the center, in order to maintain the longitudinal balance of the machine. In that case, a pair of side frames are arranged along both left and right sides of the fuselage, and the tips of the side frames are fixed to both left and right ends of a transmission case with an engine to constitute a fuselage frame, and the transmission case is Mounting wheels via a swing case whose front end is pivotally connected to the case is a prior art technique developed in 1983.
This prior art is disclosed in Japanese Patent No. 56514, and in this prior art, a pair of left and right side frames are arranged in parallel along both sides of the fuselage.

By the way, the advantages of a single-wheel rice transplanter are that it is easy to change direction at the edge of a ridge and has a small turning radius, and that the machine can be made lightweight. This is done by lifting the rear part and tilting the entire rice transplanter toward the turning side, so in order to reduce the turning radius and make tight turns, the entire rice transplanter must be tilted significantly toward the turning side. We must make it possible to do so. However, when a pair of left and right side frames are arranged parallel to each other along the outside of the fuselage as in the prior art, the transmission case has to protrude significantly in the lateral direction and this has to fix each side frame. Because the tip of the side frame protrudes significantly to the side of the machine, even a slight tilt of the machine will cause the tip of the side frame to touch the field, preventing the machine from tilting, increasing the turning radius, and causing contact with the field. There was also a risk that the planted seedlings would be knocked over by the front part of the side frame that touched them.

This problem can be solved with parallel side frames by positioning the front of the side frames well above the field.
It is necessary to prevent the side frames from touching the field even if the machine is tilted significantly, but if the tips of the side frames are positioned high in this way, the engine and transmission case will also be located higher, raising the center of gravity at the front of the machine. This causes the inconvenience that the aircraft, which is already unstable, becomes even more unstable.

Furthermore, when the side frames are arranged in parallel, the transmission case must protrude significantly in the lateral direction as described above, which reduces its rigidity. In order to avoid this, the transmission case must have a sturdy structure.
Another problem was that it increased the weight of the aircraft.

The present invention solves the above-mentioned problems when a single-wheel walking type rice transplanter is configured by connecting a pair of left and right side frames to a transmission case with an engine, and also solves the above problems by connecting a pair of left and right side frames to a transmission case with an engine. The purpose of this is to increase the rigidity and reduce the weight of the wheel lifting mechanism.

Therefore, in the present invention, a pair of left and right side frames are provided that extend rearward from a transmission case equipped with an engine, and one wheel is disposed between the two side frames via a swing case that is pivotally connected to the transmission case. On the other hand, in a rice transplanter comprising a seedling stand and a pair of left and right control handles arranged behind the wheels, the distance between the two side frames becomes narrower toward the front of the machine body. While the rice transplanter is arranged in a V-shape in plan view, a wheel lift lever extending in the front-rear direction of the rice transplanter is arranged between one of the two side frames that is close to the swing case and the swing case. and one end of the wheel lift lever is connected to the swing case, and the other end of the wheel lift lever is rotatably pivoted to the one side frame via a pin. This is what I did.

With this configuration, by arranging the side frames extending rearward from the transmission case in a V-shape in plan view, the protrusion dimension of the transmission case can be made shorter than when the side frames are arranged parallel to each other. In addition to strengthening the rigidity and reducing weight, by making both side frames tapered, even when the aircraft is tilted significantly with the side frames positioned downward, the side frames The front part of the rice transplanter can be prevented from touching the field, improving the stability of the machine, while the turning radius of the rice transplanter can be made smaller, making it easier to turn, and the planted seedlings can be planted on the side. The frame can prevent it from falling over,
Moreover, it has the effect of improving the forward visibility.

Also, when moving the wheels up and down, between the swing case and one of the side frames that is closer to the swing case,
A wheel lift lever extending in the front-rear direction of the rice transplanter is provided, one end of the wheel lift lever is connected to a swing case, and the other end of the wheel lift lever is connected to a swing case.
Since it is rotatably connected to the one side frame via a pin, the swing case can be directly rotated by the wheel lift lever that is pivotally connected to the side frame via a pin. The wheels can be raised and lowered by using the wheels, and the mechanism for raising and lowering the wheels can be made into a simple structure. In that case,
When the side frames are arranged in parallel, the distance between the side frame and the wheel lift lever becomes quite wide, so the length of the pin to pivot the wheel lift lever to the side frame becomes longer, reducing its rigidity. However, in the present invention, by arranging both side frames with tapered ends, the distance between the side frames and the wheel lift levers can be reduced. Therefore, the length of the pin for pivotally connecting the wheel lift lever to the side frame can be shortened.
By increasing the rigidity of the pin, the rotation of the wheel lift lever can be made smoother, and by increasing the rigidity of these members, it is possible to reduce the weight of the wheel lift mechanism.

Below, an embodiment of the present invention will be explained with reference to the drawings. In the drawing, 1 is a body frame of a rice transplanter, and the body frame 1 includes a transmission case 3 with an engine 2 mounted on the upper surface, and a rearward side from both left and right ends of the transmission case 3. It has a substantially U-shape in plan view with a pair of left and right hollow side frames 4 and 5 extending from the left to the right. In this case, the side frames 4 and 5 are arranged in a V-shape in plan view so that the distance between them becomes narrower toward the front of the fuselage.

The traveling transmission case 6 provided integrally with the transmission case 3 includes both side frames 4 and 5.
The front end of a swing case 7 is rotatably connected between the swing case 7 and the rear end of the swing case 7, which is disposed so as to extend rearward. It is equipped with two wheels 8. The wheels 8 are rotationally driven by power transmitted from the traveling transmission case 6 via a chain (not shown) in the swing case 7.

Seedling planting cases 9 and 10 are fixed to the rear ends of both side frames 4 and 5, respectively, and the two seedling planting cases 9 and 10 are connected by a gate-shaped connecting frame 11, The gate-shaped connecting frame 11 is configured to support a wheel lifting device 12, which will be described in detail later, to move the wheels 8 up and down.

Reference numerals 13 and 14 denote a pair of left and right operating handles extending rearward and diagonally upward from the rear surfaces of the seedling planting cases 9 and 10, and a pair of control handles 13 and 14 are fixed to the front surfaces of the two handles 13 and 14. A seedling stand 17 is supported so as to be laterally movable via a guide rail 15 and a rail mechanism 16. A transverse feed shaft 18 having a reciprocating screw groove 19 carved on its outer periphery is horizontally disposed on the back side of the lower part of the seedling stand 17, and is rotatably supported by bearings 20 and 21. A boss body 22 equipped with a key 23 that engages with the reciprocating thread groove 19 is slidably fitted onto the horizontal feed shaft 18, and this boss body 22 is locked to the back surface of the seedling stand 17. Accordingly, the seedling table 17 is configured to be able to reciprocate from side to side as the transverse feed shaft 18 rotates. Incidentally, cams 44 and 45 are provided at both ends of the horizontal feed shaft 18 for vertically feeding the seedling pine at the end of the horizontal feed of the seedling table 17.

In both the planting cases 9 and 10, claw shafts 24 and 25 extending in the horizontal and lateral directions are respectively pivotally supported, and at the inner ends of the both claw shafts 24 and 25, a swinging type seedling planting mechanism 2 is installed.
6, 27 respectively, while each claw shaft 24, 2
Bevel gears 28 and 31 are respectively fixed to the outer ends of the side frames 4 and 5, and these bevel gears 28 and 31 are connected to bevel gears 28 and 33 that are fixed to transmission shafts 29 and 32 inserted into the respective side frames 4 and 5. By meshing with each other, the planting claws 26 and 27 are configured to be driven in response to power transmission from the engine 2. Further, the outer end of one of the pawl shafts 24 protrudes from the planting case 9, and a sprocket 34 is fitted to the protrusion, and the sprocket 34 is fitted to the sprocket 34 and to one end of the horizontal shaft 18.
Wrap the chain 37 around 5 and the seedling planting mechanism 26,
The seedling table 17 and the seedling pine are linked to be fed in conjunction with the swinging movement of the seedling 27. The sprockets 34, 35 and chain 37 are protected by a case 36.

Further, 38 and 39 are the above-mentioned both side frames 4,
The floats 38 and 39 have their front ends connected to both side frames 4 and 5.
5 via a link 41 so as to be vertically movable, while the rear end is attached to the lower end portions of both the control handles 13, 14 via a planting depth adjusting rod 40. In this case, flattened portions 42 and 43 having a planar triangular shape are formed on the inner surfaces of both bloats 38 and 39,
Both the seedling planting mechanisms 2 are placed above the both level parts 42 and 43.
6 and 27, respectively, so that seedlings can be planted at the rear portions of both the leveled portions 42 and 43.

On the other hand, between the side frame 5 which is close to the swing case 7 among both side frames 4 and 5 and the swing case 7, a long bell crank-shaped wheel lift lever 16 is disposed along the front-rear direction of the aircraft body. One end of the wheel lift lever 46 is connected to the swing case 7 via a link 48, and a portion near the other end of the wheel lift lever 46 is connected to a pin 47.
The wheel lifting lever 46 is rotatably connected to the one side frame 5 via the wheel lifting lever 46, and the other end of the wheel lifting lever 46 is connected to the wheel lifting device 12. This wheel lifting device 12 is of a screw type, and a handle 49, which is one embodiment of the operation lever, is used to turn a female threaded pipe 50, and a rod 51 screwed into the female threaded pipe 50 is expanded and contracted to operate the lifting lever. 46, and the swing case 7 moves up and down in conjunction with the rotation of the lift lever 46.
It is configured to move up and down.

In this configuration, if the seedling pine is placed on the seedling platform 17 and the engine 2 is started, and the power is transmitted to the wheels 8 and the seedling planting mechanisms 26 and 27, the rice transplanter is
In conjunction with this, the seedling planting mechanisms 26 and 27 move forward and the seedling platform 17 is moved horizontally. Therefore, the plants are divided one by one and planted successively along two rows in a field that has been leveled in advance using the leveling parts 42 and 43 of the floats 38 and 39, respectively. When the handle 49 of the wheel lifting device 12 is rotated, the wheels 8 are raised and lowered in accordance with changes in the depth of the tiller.

In this case, since both side frames 4 and 5 are arranged in a V-shape with tapered ends, the protrusion dimension of the transmission case 3 in the left-right direction is such that the side frames 4 and 5 are It can be made shorter than when it is arranged in parallel with the same spacing as 9 and 10, and the rigidity of the transmission case 3 can be strengthened, so that it can be made lighter accordingly. Furthermore, by arranging both side frames 4 and 5 in a tapered V-shape in plan view, the tips of both side frames 4 and 5 can be positioned closer to the center of the fuselage. Even when the front portions of both side frames 4 and 5 are positioned downward, the side frames can be prevented from touching the field even if the machine body is tilted greatly toward the turning side when changing the direction of the rice transplanter. Therefore,
Although it can improve the stability of the aircraft by lowering the center of gravity at the front of the aircraft, it also improves forward visibility and improves maneuverability by making tight turns.Furthermore, when changing direction, the side frames can be used to protect the seedlings after planting. It is possible to prevent it from being defeated.

In addition, when raising and lowering the wheels 8, the wheel raising/lowering lever 46 is attached to one side frame 5 by the pin 4.
Since the swing case 7 is pivoted via the wheel lift lever 46 and the swing case 7 is directly rotated by the wheel lift lever 46, the wheel lift mechanism can be simplified. In that case, if both side frames 4 and 5 are arranged parallel to each other, the distance between one side frame 5 and the wheel lift lever 46 is widened, so that the wheel lift lever 46
The length of the pin 47 for pivotally mounting the wheel becomes longer and its rigidity decreases, which impedes the smooth rotation of the wheel lift lever 46. At the same time, the mounting structure of the pin must also be made strong, which increases the stability of the wheel lift mechanism. Although there is a risk of the problem of increased weight, in the present invention, by arranging both the side frames 4 and 5 in a V-shape in plan view, the side frame 5 and the wheel lift lever 46 can be easily connected to each other. The wheel lift lever 46 is moved under a condition in which the distance between the wheels is reduced and the length of the pin 47 is shortened.
Since the pin 47 is pivotally mounted, the rigidity of the pin 47 can be strengthened and its mounting structure can be simplified. This not only simplifies the structure of the wheel lifting mechanism, but also improves its rigidity and reduces weight. It is possible to achieve this.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a side view of a rice transplanter, FIG. 2 is a plan view of the rice transplanter, and FIG. 3 is an enlarged plan view of FIG. 1...Vehicle frame, 2...Engine, 3...
Transmission case, 4, 5...Side frame, 7...
Swing case, 8... Wheels, 13, 14... Control handle, 17... Seedling stand, 26, 27... Seedling planting mechanism, 12... Wheel lifting device, 46... Wheel lifting lever, 47... Pin .

Claims (1)

[Scope of utility model registration request] A pair of left and right side frames are provided that extend rearward from a transmission case equipped with an engine, and one wheel is disposed between the two side frames via a swing case that is pivotally connected to the transmission case. In this rice transplanter, the rice transplanter is equipped with a seedling stand and a pair of left and right control handles at the rear of the machine. On the other hand, a wheel lift lever extending in the front-rear direction of the rice transplanter is arranged between one of the side frames that is close to the swing case and the swing case, and the wheel lift lever A walk-behind rice transplanter characterized in that one end of the wheel lift lever is connected to a swing case, and the other end of the wheel lift lever is rotatably pivoted to the one side frame via a pin.