JPH035Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a so-called single-wheel walk-behind rice transplanter that is equipped with only one wheel approximately at the center of the body frame of the rice transplanter.

[Conventional technology]

Conventionally, this type of single-wheel walking type rice transplanter has been described, for example, in Japanese Utility Model Application Publication No. 55-56514,
A pair of left and right side frames disposed on the left and right sides of one wheel are connected to each other by a transmission case with an engine in front of the wheel, while the rear ends of both side frames are connected to the rear end of the side frames located behind the wheel. By extending to the rear of the tilting seedling stand and connecting them to each other at the rear of the seedling stand, the entire vehicle body frame is constructed in the form of an enclosing frame in plan view, and the rear ends of both side frames To,
A seedling planting case equipped with a seedling planting mechanism located at the front of the seedling platform is configured to be attached.

[Problem that the invention attempts to solve]

However, when constructing the vehicle body frame into an enclosing frame shape in plan view in order to improve its rigidity, both side frames are extended to the rear of the seedling stand as in the prior art, and the rear ends are connected to each other. Connecting them increases the length of both side frames, which increases the weight of the rice transplanter. Therefore, when the rice transplanter is rotated, crossed over ridges, or driven on the road, the load on the hands of the operator increases when the rice transplanter is held in a certain position by the operator. It was because I couldn't do it easily.

In this type of single-wheel rice transplanter, when the body frame with both side frames is structured into an enclosing frame shape in plan view, the entire seedling planting case with a seedling loading mechanism is placed in front of the seedling loading stand. On the other hand, by connecting the two seedling planting cases or both side frames to a gate-shaped connecting body in front of the seedling platform, it is possible to reduce the weight of the rice transplanter without sacrificing rigidity. The gate-shaped connecting member is designed to also serve as a mounting member for a hand-operated part of a rice transplanter.

[Means to solve the problem]

In other words, the present invention has a vehicle body frame having side frames on both the left and right sides of one wheel, an engine in front of the wheel, and a rear-tilting seedling stand and a control handle behind the wheel. In the walk-behind rice transplanter, a seedling planting case with a seedling planting mechanism is attached to the rear ends of both side frames, and the seedling planting case is installed at a position forward of the lower end of the seedling platform, and A connecting body formed in a gate shape when viewed from the front of the rice transplanter is installed between the two seedling planting cases located or between the rear parts of both side frames, and the gate-shaped connector is connected to the rear part of the rice transplanter when viewed from the side of the rice transplanter. The upper horizontal member of the gate-shaped connected body is configured to be inclined backward so as to approach the seedling stand, and the hand operation unit of the rice transplanter is attached to the upper horizontal member of this gate-shaped connected body. It is characterized by:

[Functions and effects of the idea]

In this way, a seedling planting case with a seedling mechanism is attached to the rear end of both side frames of the vehicle body frame, which is located forward of the lower end of the seedling platform. A gate-shaped connector is installed between the cases or between the rear parts of both side frames, so that the body frame with both side frames is located in front of the seedling stand. Although the gate-shaped connecting body is connected between both side frames or between both seedling planting cases to form an enclosing frame shape in plan view, the rear ends of both side frames of the vehicle body frame are Since there is no need to extend to the rear of the seedling stand, the length of both side frames can be shortened.

On the other hand, by attaching the hand control section of the rice transplanter to the upper horizontal member of the gate-type connector for configuring the vehicle body frame in an enclosing frame shape in plan view as described above, the gate-type connector can be Since it can also be used as a support member when the hand operation part of the rice transplanter is provided on the front side of the rear-tilting seedling stand, the support member when the hand operation part is provided on the front side of the seedling stand can be omitted.

In addition, the gate-shaped connecting body when viewed from the front of the rice transplanter is tilted backward so that the upper horizontal member of the gate-shaped connecting body approaches the seedling stand when viewed from the side of the rice transplanter. The height of the gate type connector can be reduced.

In other words, since the wheels of this type of rice transplanter are moved up and down relative to the body frame, the gate-shaped connecting body that connects both seedling planting cases or both side frames can be seen from the side of the rice transplanter. In order to make it point straight upwards, the height of the gate-shaped connecting body must be made considerably high so that the wheels that move up and down do not come into contact with the upper horizontal member of the gate-shaped connecting body. However, if the gate-shaped connector is tilted backward so that the upper horizontal member portion of the gate-type connector approaches the seedling stand when viewed from the side of the rice transplanter as described above, the upper part of the gate-type connector Since the horizontal member part of is located in the direction where the height to the top surface of the wheel is lower than the wheel, the height of the gate-shaped connecting body is determined by the height of the upper horizontal member part to the wheel. On the other hand, the height to the top surface of the wheel can be lowered by an amount corresponding to the location where the height to the top surface of the wheel is lowered.

Therefore, according to the present invention, the lengths of both side frames of the vehicle body frame can be shortened as described above, and the support member when the hand operation part of the rice transplanter is provided on the front side of the rear-tilting seedling stand.
Three things are possible in combination: the gate-type connecting body that forms the vehicle body frame in the shape of a planar enclosure frame can be used for both purposes, and the height of the gate-type connection body for configuring the vehicle body frame in the shape of a planar enclosure frame can be reduced. As a result, the weight of the rice transplanter can be reduced without compromising the rigidity of the body frame, which reduces the load on hand when holding the rice transplanter in a fixed position when turning, crossing ridges, or running on the road. It is easy to operate and has the effect of improving work efficiency.

Moreover, the present invention provides a gate-shaped connecting body for forming the vehicle body frame into an enclosing frame shape in a plan view, so that the upper horizontal member of the gate-shaped connecting body approaches the seedling stand when viewed from the side of the rice transplanter. By tilting backwards, the hand control unit attached to the horizontal member at the upper end of the gate-shaped connecting member is brought closer to the front of the seedling stand, that is, to the operator, so that the hand control unit can be easily operated. However, since the lower end of the gate-shaped connected body can be separated from the seedling platform, the gate-shaped connected body can be used for tasks such as arranging seedlings supplied to the front of the seedling platform. It also has the effect of avoiding getting in the way.

〔Example〕

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 to which an engine 2 is attached on the top surface, and a rearward side from both left and right ends of the transmission case 3. A pair of left and right hollow side frames 4 extending from
5, the transmission case 3 is configured in a U-shape in plan view.
The traveling mission case 6, which is integrated with the
A front end of a swing case 7 extending rearward between the side frames 4 and 5 is rotatably pivoted, and a wheel 8 located on the center line of the vehicle body frame 1 is provided at the tip of the swing case 7. The wheels 8 are rotationally driven by the engine 2 from the traveling transmission case 6 via a chain (not shown) in the swing case 7.

Seedling planting cases 9 and 10 disposed in front of a rearward-tiling seedling stand 17, which will be described later, are fixed to the rear ends of both side frames 4 and 5, respectively. , 10 are connected by a connecting body 11 formed in a gate shape when looking at the front of the rice transplanter, thereby forming the vehicle body frame 1 in the shape of an enclosing frame in a plan view. , is configured to be inclined backward so that the upper horizontal member portion approaches the seedling stand 17 when viewed from the side.

Further, a wheel lifting mechanism 12, which will be described in detail later, is provided between the upper horizontal member portion of the gate-shaped connecting body 11 and the swing case 7, and by moving the wheels 8 up and down, the entire rice transplanter can be moved up and down. It is designed to move up and down.

Reference numerals 13 and 14 indicate a pair of left and right operating handles extending rearward from the seedling planting cases 9 and 10, and the operating handles 13 and 14 are bent in an upwardly inclined shape, and the upper surface of the inclined portion has a both handles 1
A rear-tilting seedling stand 17 supported movably in left and right directions by a guide rail 15 and a rail mechanism 16 mounted horizontally and horizontally between 3 and 14 is provided. A transverse feed shaft 18 having a reciprocating thread groove 19 on the outer periphery is supported by bearings 20 and 21 in parallel to the moving direction of the seedling stand 17 on both handles 13 and 14 at the location, and the transverse feed shaft 18 is slidable. A reciprocating screw groove 19 is provided in the boss body 22 that is movably fitted.
By providing a boat-shaped key 23 that engages the boss body 22 with the seedling stand 17, the horizontal feed shaft 18
The structure is such that the seedling platform 17 is reciprocated from side to side by the rotation of .

Note that seedling stands 17 are provided at both ends of the horizontal feed shaft 18.
Cams 44 and 45 are provided to vertically feed the seedling pine at the end of the horizontal feed.

In both the seedling planting cases 9 and 10, claw shafts 24 and 25 are supported horizontally and laterally, respectively.
Swing-type seedling planting mechanisms 26 and 27 are provided at the inner end of the seedling planting case 25, respectively, and the bevel gear 28 on the claw shaft 25 in the right seedling planting case 10 is attached to the right side frame 5.
The bevel gear 30 at the tip of the shaft 29 inserted therein is inserted into the bevel gear 31 on the claw shaft 24 in the left seedling planting case 9.
The shaft 32 inserted into the left side frame 4 is
The bevel gears 33 at the tips are meshed with each other to transmit power from the engine 2 to both claw shafts 24 and 25 to drive the seedling planting mechanisms 26 and 27, and the claw shaft 24 in the left seedling planting case 9. A chain 37 in a chain case 36 is wound around the sprocket 34 at the outer end of the shaft and the sprocket 35 at the outer end of the lateral feed shaft 18 to rotate from the pawl shaft 24 to the lateral feed shaft 18. .

Further, 38 and 39 are on both sides of the wheel 8, and both side frames 4 and 5 and both seedling planting cases 9,
10, the rear portions of both floats 38, 39 are attached to the bases of the handles 13, 14 via planting depth adjustment rods 40, and the front ends are attached to both side frames 4. ，
5 via a link 41 so as to be vertically movable. In this case, both floats 38, 39
The inner surface thereof is integrally provided with flattened portions 42 and 43 having a planar triangular shape, and the two seedling planting mechanisms 26 and 27 are located above the flattened portions 42 and 43, respectively. Seedling planting mechanism 26 at the rear part of 42, 43,
Seedlings will be planted on the 27th.

A pin 47 is attached to the right side frame 5 so that the base end of the bell crank lever 46 can be rotated.
The bell crank lever 46 is pivotally mounted, and the tip of the bell crank lever 46 is connected to the upper surface of the swing case 7 via a link 48.

The wheel lifting mechanism 12 consists of a threaded shaft 49 and a tubular 50 that is threaded onto the threaded shaft 49 and expands and contracts in the axial direction as the threaded shaft rotates. A pin 52 at the other end of the bell crank lever 46 is engaged, and a tube shaft 50 is disposed between the other end of the bell crank lever 46 and the tube shaft 50.
The buffer spring 53 is fitted onto the screw shaft 49 to elastically bias the swing case 7 downward.
A crank-shaped handle 54 for rotating the handle is fixed to the upper end of the handle, and a ball bearing 55 is fitted to the upper end of the handle. When bearing the wheel load by contacting the upper surface of the bracket 56 fixed to the side member portion, the portion where the ball bearing 55 contacts the bracket 56 is located on the axis of the screw shaft 49 with a radius having a center point O. The screw shaft 49 is formed in a spherical recess 57 of R so that the screw shaft 49 can swing, and a tension spring 58 fitted therein is mounted between the screw shaft 49 and the tube shaft 50. The tension spring 58 is configured to elastically bias the screw shaft 49 and tube shaft 50 in the direction of their contraction.

Note that a ball bearing 5 is provided on the upper surface of the bracket 56.
A cover plate 58' and its cover body 59 are attached to the spherical recess 57 into which the spherical recess 57 is fitted, and a ring body 61 made of a soft elastic material such as rubber is installed between the cover body 59 and the screw shaft 49. It's stuck. In addition, the buffer spring against the wheel load is not limited to the spring 53 fitted on the tube shaft 50 of the above embodiment, but may also be formed by twisting a part of the bell crank lever 46 into a plate spring 46 as shown in FIG. It goes without saying that other means may be used, and furthermore, the gate-shaped connecting body 11 may be provided between the rear portions of both side frames 4 and 5.

In this configuration, if seedling mats are supplied onto the seedling platform 17 and the wheels 8 and the seedling planting mechanisms 26 and 27 are driven by starting the engine 2, the rice transplanter will
While moving forward, the seedling platform 17 is reciprocated from side to side by the rotation of the transverse feed shaft 18, and
The seedlings on the seedling table 17 are placed on the seedling planting mechanism 2 that swings up and down.
After the plants are divided one by one by means 6 and 27, they are planted sequentially along two rows in a field that has been leveled in advance by the leveling parts 42 and 43 of floats 38 and 39, respectively.

During this rice planting work, when the plow in the field is deep, the wheel 8 is lowered by rotating the handle 54 in the wheel lifting mechanism 12, and the height H from the lower surface of the floats 38, 39 to the lower surface of the wheel 8 is lowered.
By increasing the height H and lowering the height H when the plowing platform in the field is shallow, the ground pressure of the floats 38 and 39 relative to the field is adjusted to a substantially constant level. When traveling over a ridge or on a road, the wheels 8 are lowered by rotating the handle 51 in the wheel lifting mechanism 12, thereby raising the entire body.

In addition, in place of or in addition to the handle 54 of the wheel lifting mechanism 12, the upper horizontal member of the gate-shaped connector 11 is provided with various hand-operated parts such as a manual shifter pull of the engine 2 or a travel gear shift lever. It is possible.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view of a rice transplanter, Fig. 2 is a plan view of the rice transplanter, Fig. 3 is an enlarged plan cross-sectional view of Fig. 1, and Fig. 4 is a wheel. FIG. 5 is an enlarged sectional view of a main part of FIG. 4, and FIG. 6 is a diagram showing another embodiment. 1...Vehicle frame, 2...Engine, 3...
Transmission case, 4, 5...Side frame, 8...
Wheel, 7... Swing case, 9, 10... Seedling planting case, 26, 27... Seedling planting mechanism, 13, 14
... Control handle, 17 ... Seedling stand, 11 ... Gate-shaped connection body, 12 ... Wheel lifting mechanism, 54 ... Handle.

Claims (1)

[Scope of utility model registration request] A walk-behind rice transplanter comprising a vehicle body frame having side frames on both the left and right sides of one wheel, an engine in front of the wheel, and a rear-tilting seedling stand and a control handle behind the wheel. At the rear ends of both side frames, a seedling planting case with a seedling mounting mechanism, which is located forward of the lower end of the seedling platform, is attached, while a seedling planting case located forward of the seedling platform is attached to the rear ends of the side frames. Between the cases or between the rear parts of both side frames, a connecting body formed in a gate shape when viewed from the front of the rice transplanter is installed. A walking device characterized in that the upper horizontal member portion is configured to be inclined backward so as to approach the seedling platform, and the hand control unit of the rice transplanter is attached to the upper horizontal member portion of the gate-shaped connected body. Type rice transplanter.