JP6835490B2 - Small field management machine - Google Patents

Description

The present invention relates to a relatively simple small field management machine called a tiller type or a front tine type, and can sufficiently cultivate even a field in which the cultivated soil is tight and in poor conditions. It is related to the improvement to make it.

From the background that hobby horticulture in so-called kitchen gardens is spreading, a small power-type field management machine that can be easily used is attracting attention. As such a small field management machine, for example, a hand-push operation equipped with an engine-driven tillage rotor called a tiller type or the like is provided on the market. As a result of the demand for simplicity, this one does not have wheels for moving on cultivated soil, and the tiller rotor acts like a wheel even when the aircraft moves, and of course the overall weight of the aircraft is also compared. Light weight.
For this reason, if the cultivated soil is cultivated in advance and the conditions are good, the cultivated soil can be re-digged smoothly, but if the cultivated soil is tightly packed or mixed with boulders, etc. I can't do it smoothly.
That is, in such a small field management machine, when the cultivated soil is hard, the cultivating rotor does not enter the cultivated soil, and on the contrary, the machine body is flipped up and the cultivating action cannot be performed at all. Of course, if it is a so-called full-scale cultivator, such an uncultivable state does not occur, but in the so-called kitchen garden-scale hobby area, the introduction of such a full-scale cultivator cannot be considered.

Japanese Patent No. 3917791

The present invention has been made in consideration of such a background, and is a novel small field capable of reliably cultivating cultivated soil under poor conditions even if the machine is suitable for cultivating work on a kitchen garden scale. The technical issue was to devise a garden management machine.

The small field management machine according to claim 1 includes a drive motor, a drive unit including a transmission mechanism, and a tillage rotor that is rotationally driven by the drive unit, and includes a main body unit. With respect to the main unit, it is a small field management machine provided with an operation handle extending rearward, and the tilling rotor performs a tilling action and a wheel-like action, and the operating handle. Is rotatably provided with respect to the main body unit in a handle pivot located closer to the front of the drive unit, and the operation handle is located between the main body unit at a position between the handle pivot portion and the rear operation end. It is characterized by having an elastic unit, the arrangement position of the elastic unit is above the operating range in the front-rear direction of the tiller rotor, and the connection between the elastic unit and the operation handle and the main body unit is a pin connection. It consists of.

The small field management machine according to claim 2 is characterized in that, in addition to the requirement according to claim 1 , the position of the center of gravity of the drive unit in the front-rear direction is ahead of the center position of the tiller rotor. is there.

First, according to the invention of claim 1, the operation handle is rotatably connected to the main body unit in front of the main body unit, and the elastic unit is provided between the operation handle and the main body unit in the middle of the operation handle. When cultivating cultivated soil in poor conditions, the entire aircraft will be flipped up, and this movement will cause the elastic unit to contract for a moment, but immediately after that, it will become a momentary restoring force in the direction of extension. This restoring force is combined with the force that the operator pushes the aircraft downward through the operation handle, and promotes the action of the tiller rotor to act momentarily strongly on the tillage soil, and as a result, even tightly tightened tillage soil is sufficient. It can be cultivated.
In addition, the elastic unit, which is an important element that exerts the above effect, is provided above the action position of the tiller rotor, and the elastic action of the elastic unit effectively presses the tiller rotor against the tillage soil and tightens it tightly. It can be cultivated smoothly even in bad conditions.

Further, according to the invention of claim 2, the position of the center of gravity of the drive unit in the front direction is in front of the center of the tiller rotor, and the weight of the drive unit effectively presses the tiller rotor against the tillage soil to firmly tighten the drive unit. It can be cultivated smoothly even in bad conditions.

It is a perspective view which shows the small field management machine which concerns on this invention. It is the same side view. It is a side view which shows the other Example of the small field management machine which concerns on this invention. It is explanatory drawing which shows the other embodiment of the elastic unit in this invention. It is a side view which shows still another Example. It is a vertical sectional side view which shows still another Example. It is a side view which shows the form in which the elastic force can be adjusted freely in the same elastic unit.

The embodiment for carrying out the present invention is one of the examples described below, and also includes various improved examples based on this technical idea.

Hereinafter, the present invention will be specifically described with reference to the illustrated examples.
First, the small field management machine T of the present invention will be described. This machine is mainly used as a cultivator for cultivating cultivated soil, but since it is also used for cultivation and harvesting work in a field, the name is given to a small field. It is a garden management machine T. Specific examples include digging up and harvesting root vegetables, fertilizing and mixing work for cultivation management, and the like.
The small field management machine T includes a drive unit D including a drive prime mover 1, a mission mechanism 2, and a tillage rotor 3 rotationally driven by the drive unit D, and constitutes a main body unit B. The main body unit B is basically provided with an operation handle 5 extending rearward, and a resistance rod 4 is provided behind the tilling rotor 3 as needed.

First, prior to explaining the feature structure of the present invention, each of the above components will be further described. In the explanation, the term "front and back" means that the direction in which the operator operates the small field management machine T to proceed is the front and the opposite side is the rear.

First, the drive prime mover 1 constituting the drive unit D will be described. This engine generally uses a small internal combustion engine, and a 4-stroke or 2-stroke engine is often used. Gasoline is often used as the fuel, but gas or the like may be used as the fuel. In the case of such an internal combustion engine, the fuel tank 11 is mounted in the vicinity of the drive unit D.
Further, the drive prime mover 1 is not necessarily limited to an internal combustion engine, and an electric motor or the like can also be applied.
In the case of an electric motor, a battery is generally suitable as the driving energy source, but if the working conditions are good, a method of pulling a power cord to supply power from a commercial power source or a generator installed near the field can be adopted.

The rotational output is taken out from such a drive prime mover 1, and this is first transmitted to the mission mechanism 2. The drive prime mover 1 and the transmission mechanism 2 may have a common casing as an outer shell member to be a so-called unit type, or a so-called separate type in which separate bodies are connected via a primary transmission means. In many cases, a separate type is provided with both the drive prime mover 1 and the transmission mechanism 2 and a frame F for holding the tiller rotor 3. On the other hand, in the case of a unit type in which the drive prime mover 1 and the mission mechanism 2 are integrated, if a part for attaching the handle to the casing, which is the outer shell member, is formed in advance, the small field management machine is infinitely so-called frameless. Although T can be configured, it is also possible to adopt a configuration including a frame F as in the embodiment described later.
In many cases, the mission mechanism 2 is a gear mechanism that slows down the rotation of the drive prime mover 1 and changes the rotation transmission direction of the tiller rotor 3 that is always horizontally arranged to the rotation shaft 31, such as a worm gear mechanism. Is built-in.

Next, the tilling rotor 3 will be described. The tilling rotor 3 includes a rotating shaft 31 extending in the horizontal width direction from the transmission mechanism 2 and a rotor blade 32 provided on the rotating shaft 31. In reality, it is rare that the rotor blade 32 is directly attached to the rotating shaft 31, and a plurality of rotor blades 32 are fixed by sleeve-shaped bosses at the center, and these bosses are often externally fitted and fixed to the rotating shaft 31. .. Further, above the tilling rotor 3, a rotor guard 33 that contributes to ensuring work safety and preventing mud splashing of the tilling soil S is provided by using a frame F or the like.
The drive unit D including the drive prime mover 1 and the transmission mechanism 2 and the tilling rotor 3 as a whole are used as the main body unit B.

Next, the operation handle 5, which is a characteristic configuration of the present invention, will be described. The operation handle 5 is not fixedly attached to the main body unit B, but is rotatably provided with respect to the main body unit B in a handle pivot 51 provided at a portion closer to the front of the drive unit D. The operation handle 5 includes a repulsion unit 6 between the handle pivot 51 and the rear operation end 52.
First, the operation handle 5 will be described in detail. As an example, the operation handle 5 has a shape called two so-called square handles or bar handles, and adopts a shape extending rearward and upward of the main body unit B. Of course, the left and right handle members may have a loop shape connected on the free end side, that is, on the operation end 52 side.
In addition to externally fitting a grip rubber 52G to improve the work feeling, the operation end 52 is provided with an operation lever 52L or the like for performing various operations such as power transmission according to a conventional method.
In the embodiment shown in FIGS. 1 and 2, since the handle pivot 51 is set in front of the frame F of the main body unit B, it extends diagonally forward in a side view while avoiding interference with the drive unit D. After that, it takes a shape that can be said to be a horizontal L-shape or a "tsu" shape, with its upper end facing slightly diagonally upward.
However, it is not limited to such a shape as long as interference with other constituent members can be avoided.

Such an operation handle 5 includes a repulsion unit 6 between the handle pivot 51 and the operation end 52 at a position between the main body unit B, and the repulsion unit 6 will be described below. ..
As a basic embodiment of the elastic unit 6, the type of the compression spring unit 61 as shown in FIGS. 1, 2, 3, 4 (a) can be mentioned. As shown in FIG. 4A, for example, a slide guide 61A in which a slidable rod is incorporated in a cylinder is provided with an upper bracket 61B at the upper end thereof, and an under bracket 61C is profitable at the lower end thereof. In the meantime, the spring body 61D is compressed and arranged. Then, the upper bracket 61B is pin-connected to the receiving bracket 53 of the operation handle 5, while the under bracket 61C is pin-connected to the main body receiving bracket Fb of the frame F which is a part of the main body unit B.

The present invention is based on the above-described embodiment, and its operating state will be described below.
The basic tillage work itself uses a general method. That is, the drive prime mover 1 is appropriately operated, and the rotation is transmitted to the tiller rotor 3 by operating the clutch or the like. At this time, the worker M presses the entire body of the small field management machine T against the cultivated soil S of the field and holds it moderately while grasping the operation end 52 of the operation handle 5. At this time, when the cultivated soil S is tightly tightened, in the conventional type, the cultivated rotor 3 can be flipped up without biting into the cultivated soil S, and acts like a wheel to simply move forward. However, in the present invention, although the tilling rotor 3 tends to be flipped up by the hard cultivated soil S, when the worker M stays at that position without advancing, the movement of the tilling rotor 3 due to the flipping up is caused. It has the effect of promoting tillage.

That is, when the tilling rotor 3 is flipped up, the elastic unit 6 interposed between the tillage rotor 3 is momentarily compressed, but immediately after that, the elastic unit 6 is extended by the reaction. It becomes. This movement, coupled with the force with which the operator M pushes the operating handle 5 slightly downward, is instantaneously transmitted to the tiller rotor 3. As a result, the rotor blade 32 in contact with the cultivated soil S enters the cultivated soil S in a state where the force is momentarily concentrated. By continuing such movements, the rotor blades 32 will sequentially bite into the tightly packed cultivated soil S.
Because more to effectively perform such an action, the pressing action position of downward spring unit 6, i.e. substantially in the connecting position of the under bracket 61C of the elastic unit 6 barrel compression spring unit 61, tilling rotor and the operating range of 3, even the upper rotary shaft 31. In addition, considering the downward pressing of the tilling rotor 3, the position of the center of gravity of the drive unit D, which is a heavy member, is preferably in front of the center position of the tilling rotor 3.

[Other Embodiments]
The present invention is based on the above-described embodiment as one basic technical idea, and the following modifications can be further considered.
<Example of overall shape>
The small field management machine T of the present invention can take various forms depending on the shape and size of the main body unit B. For example, in the one shown in FIG. 3 for further miniaturization, the handle pivot 51 is provided at the upper end of the subframe-shaped frame F raised in the front upper part of the main body unit B, while the elastic unit 6 is driven by the drive unit D. It is provided above the prime mover 1. This position is substantially directly above the rotating shaft 31 of the tiller rotor 3.

<Example of elastic unit 6>
The elastic unit 6 is located between the operation handle 5 and the main body unit B and acts to urge the tiller rotor 3 so to speak, and various forms can be applied as long as this object can be achieved.
(I) Rubber combined unit 62
Instead of the compression spring unit 61, a so-called erigo type elastic unit 6 in which the core spring 62A is molded with the mold rubber 62B as shown in FIG. 4C can be applied. This is equipped with an upper bolt 62C and a lower bolt 62D for mounting as shown in the figure.

(Ii) Link type unit 63
A component including a center-folding link mechanism can also be applied as a component of the elastic unit 6. That is, this type is a combination of the upper link 631 connected to the operation handle 5 side and the lower link 632 connected to the main body unit B side, and both are rotatably connected by the connection pivot 633. The operation handle 5 side and the upper link 631 are pin-connected by the upper pivot 631P, and the main body unit B and the lower link 632 are pin-joined by the lower pivot 632P.
As an example of imparting elasticity to such a link type unit 63, in addition to the tension spring 64 horizontally arranged as shown in FIG. 5A, the compression spring 65 is used as shown in FIG. 5B. Can be applied.

Furthermore, as another form of imparting elasticity to the link type unit 63, the deformed elastic rubber 66 can be applied. That is, for example, the deformed elastic rubber 66 acts on the portion of the connecting pivot 633, which is a so-called Knighthardt type elastic structure. Specifically, an outer casing 661 that creates a side-viewing square-shaped space is provided on the upper link 631 side, and a side-viewing square-shaped as an example that can rotate in the outer casing 661 on one lower link 632 side. An inner boss 662 is provided. Then, the space created by both is set as a compression chamber 663, and for example, a deformed elastic rubber 66 having a triangular side view is arranged here. In this structure, when the upper link 631 and the lower link 632 rotate with each other, the deformed elastic rubber 66 is compressed, and the reaction force pushes the main body unit B downward. If necessary, such a mechanism can be configured alone or in combination with other parts in the upper pivot 631P and the lower pivot 632P in addition to the connection pivot 633, and as a result, the elastic force can be set.
By the way, as long as the form of giving elasticity such as the deformed elastic rubber 66 can be considered, other twisting coil springs, air elastic units and other member elements capable of giving elasticity are applied. Of course, it can be done.

<Variable adjustment mechanism 641>
As mentioned in the modified elastic rubber 66 type, the elastic strength of the elastic unit 6 can also be adjusted. The embodiment shown in FIG. 7A is basically applied to the compression spring unit 61, and a receiving seat 61E whose receiving height can be adjusted is provided below the slide guide 61A that receives the spring body 61D. As a result, the initial load of the spring body 61D is adjusted, and the elastic strength can be set.
Furthermore, in the embodiment shown in FIG. 7B, the receiving bracket 53 on the operation handle 5 has a curved elongated hole-shaped adjusting hole 53A in which the mounting position can be freely selected so that the installation angle of the compression spring unit 61 itself can be changed. To form. If the fixed position of the upper bracket 61B of the compression spring unit 61 is changed, the setting angle of the compression spring unit 61 changes, and the elastic force can be selected and set to be the strongest when standing upright and weaker when arranged in an inclined manner.
Furthermore, various measures can be taken, such as changing the wire diameter and winding diameter of the spring body 61D to exert a progressive effect as an elastic characteristic.
By the way, as long as the technical idea that the impact strength can be adjusted on the impact unit 6 side can be taken into consideration, the position of the handle pivot 51 on the operation handle 5 can be selected several positions back and forth or up and down, and the same purpose is achieved. The technical idea to be done is also included in the technical idea of the present invention.

T Small field management machine S Tillage soil M Worker D Drive unit B Main body unit F frame Fb Main body receiving bracket 1 Drive prime mover 2 Mission mechanism 3 Tillage rotor 4 Resistance rod 5 Operation handle 6 Repulsion unit

1 Drive motor 11 Fuel tank

2 Mission mechanism

3 Tilling rotor 31 Rotating shaft 32 Rotor blade 33 Rotor guard

4 Resistance rod

5 Operation handle 51 Handle pivot 52 Operation end 52G Grip rubber 52L Operation lever 53 Receiving bracket 53A Adjustment hole

6 Repulsion unit 61 Compression spring unit 61A Slide guide 61B Upper bracket 61C Under bracket 61D Spring body 61E Receiving seat 62 Rubber combined unit 62A Core spring 62B Mold rubber 62C Upper bolt 62D Lower bolt 63 Link type unit 631 Upper link 631P Upper pivot 632 Link 632P Lower pivot 633 Connection pivot 64 Tensile spring 65 Compression spring 66 Deformed elastic rubber 661 Outer casing 662 Inner boss 663 Compression chamber 641 Variable adjustment mechanism

Claims (2)

The main body unit is composed of a drive unit including a drive prime mover, a transmission mechanism, and a tillage rotor that is rotationally driven by the drive unit.
For this main body unit, it is a small field management machine provided so that the operation handle extends rearward.
The tilling rotor performs a tilling action and a wheel-like action.
Further, the operation handle is rotatably provided with respect to the main body unit in a handle pivot located closer to the front of the drive unit, and the operation handle is a main body at a position between the handle pivot portion and the rear operation end. An elastic unit is provided between the unit, and the position of the elastic unit is above the operating range in the front-rear direction of the tiller rotor, and the connection between the elastic unit and the operation handle and the main body unit is a pin connection. A small field management machine characterized by being present.
Claim 1 Small圃園management machine, wherein the position of the center of gravity is forward of the center position of the tiller rotor in the longitudinal direction of the drive unit.

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