JP7184663B2 - planting drill - Google Patents

Description

TECHNICAL FIELD The present invention relates to a planting drill for providing planting holes in the ground for planting seedlings such as trees and agricultural crops, and more particularly to a planting drill capable of coping with various soil conditions.

The following patent document 1 discloses a perforator for planting seedlings for providing planting holes in ridges for planting seedlings such as strawberries.
This seedling planting drilling tool is detachable from a ready-made power tool, and is rotated by a rotational force from a drive-side rotating shaft. It comprises a spiral body wound around the outer periphery of the body and a substantially cylindrical excavated soil scattering prevention cover attached to the outer periphery of the spiral body.
The spiral body is provided for discharging the excavated soil, and the excavated soil scattering prevention cover is provided for preventing the excavated soil discharged by the spiral body from scattering around.

Japanese Patent Application Laid-Open No. 2009-195153

However, with the seedling planting drilling tool described above, there is a concern that excavation efficiency may be lowered due to at least one of the following problems.
(1) When used for drilling work in soil mixed with roots, the roots tend to get entangled in the spiral body, and the drilling may stop.
(2) If the power tool continues to be driven while excavation is not progressing, the battery of the power tool will be consumed rapidly.
(3) Work such as removing the entanglement of gravel is laborious and time consuming.

SUMMARY OF THE INVENTION Accordingly, one object of the present invention is to provide a planting drill suitable for drilling soil mixed with obstacles such as roots and gravel.

The first invention of the present application, which has been made to solve the above problems, is a planting drill for forming a planting hole in the ground for planting seedlings such as trees and plants, which is a manual or electric tool. a rotating shaft rotatable by a driving force from the rotating shaft; two or more tip blades provided near the tip of the rotating shaft and extending outward from the rotating shaft; provided on the outer periphery of the rotating shaft; and a helical blade for excavating and discharging earth and sand upward, wherein the tip blade has a lower end connected to the rotating shaft, and an overhang length extending outward from the rotating shaft is the length of the rotating shaft. A first slanted side having a shape that gradually decreases linearly toward the distal end side , and is provided upward so as to be continuous with the upper end of the first slanted side, and has an overhang length extending outward from the rotation axis. and a connecting side having a shape of approximately equal length, wherein, of the two or more tip blades, the tip blade connected to the spiral blade connects the connecting side to the lowest end of the spiral blade. Among the two or more tip blades, the tip blade that is not connected to the spiral blade has one end connected to the upper end of the connecting side and the other end connected to the rotating shaft, and the rotating shaft and a second slanted side having a shape in which the length of the overhang extending outward from the rotary shaft linearly tapers toward the rear end side of the rotating shaft .

According to the present invention, at least one of the effects described below can be obtained.
(1) Since the first inclined side provided on the tip blade pushes out obstacles such as roots in the soil to the outside and pushes them apart, the roots in the soil are particularly difficult to get entangled with the tip of the boring tool. , there is no risk that the drilling will be delayed due to clogging of obstacles.
(2) Obstacles such as pebbles are guided into the space formed outside the second inclined side provided on the tip blade, so that the periphery of the tip blade is less likely to be clogged with obstacles.
(3) By providing the second inclined side or connecting side, the outer side of the tip vane is not formed with an acute-angled portion that may become a structurally weak portion.
(4) Since the area formed by the first inclined side, the connecting side and the second inclined side has a substantially trapezoidal shape, within the range of the rectangular area defined by the maximum width and maximum length of the tip blade, The area of the tip blade can be secured as large as possible, contributing to the strength improvement of the tip blade.
(5) The lowest end of the spiral blade is connected to one tip blade omitting the second inclined side, and the remaining tip blades are provided with at least the second inclined side. Since a gap is not formed on the circumferential direction side of the rotating shaft between the target tip blade and the spiral blade, problems such as pebbles being caught in the gap can be avoided.
(6) Since the power tool does not continue to be driven in a state where the drilling ability is abnormally lowered due to smooth drilling, wasteful battery consumption of the power tool can be prevented.
(7) Work time is not wasted by work such as removing root tangles.
(8) Compared to the engine type, it is lighter and less noisy, so the physical burden on the worker is reduced, and workability and safety on steep slopes and mountains with poor footing are improved, and labor can be reduced.
(9) Since large tools such as heavy machinery are not used, planting holes can be formed on slopes or in narrow spaces. Moreover, the cost of forming a planting hole can be suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS The whole block diagram of the boring tool for planting which concerns on this invention. FIG. 2 is an image diagram of use of the drilling tool for planting according to the present invention. The figure which shows the other shape example of a front-end|tip blade|wing.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<1> Overall configuration (Fig. 1)
The planting drill A according to the present embodiment (hereinafter also simply referred to as "the drill A") is an attachment type jig that is detachably attached to an electric power tool.
FIG. 1 shows an example of the overall configuration of a planting drill A according to the present invention.
1(a) is a front view of the planting drill A, and FIG. 1(b) is a rear view of the planting drill A. FIG.
The planting drill A according to this embodiment includes at least a rotating shaft 10 , a spiral blade 20 and a tip blade 30 .
Details of each element will be described below.

<2> Rotating shaft (Fig. 1)
The rotating shaft 10 is an element for transmitting rotational force to the helical blade 20 and the tip blade 30 .

<2.1> Rear End Side of Rotating Shaft In the present invention, means for applying a rotational force to the rotating shaft 10 is not particularly limited.
In this embodiment, one end (rear end) of the rotary shaft 10 is configured to be attachable to and detachable from the power tool, so that the rotary shaft 10 can be rotated by the power tool.
In addition, the punch A according to the present invention may be configured such that a separately provided handle or the like is used to manually apply a rotational force to the rotating shaft 10 .

<2.2> Tip Side of Rotating Shaft On the other end (tip) side of the rotating shaft 10, there is provided a sharpened portion 11 that pierces the ground at the start of excavation work to prevent the entire drilling tool from shaking.
In this embodiment, the tip of the sharpened portion 11 has a cross shape like a Phillips screwdriver.

<3> Spiral blade (Fig. 1)
The spiral blade 20 is an element for excavating the ground and discharging excavated soil.
In this embodiment, the helical blade 20 is configured by blades (blades) spirally provided around the rotating shaft 10 substantially above the tip blade 30 to be described later.

<3.1> Shape example of spiral blade The gradient of the spiral blade 20 may be constant, or may be configured to increase upward.
Further, the spiral blades 20 may be arranged such that the blade portions are continuous, or the blade portions may be intermittently arranged in a substantially stepped manner.
Note that the length of the spiral blade 20 may be appropriately determined according to the depth of the hole for planting. In this embodiment, the length of the spiral blade 20 is set longer than the depth of the hole.

<4> Tip blade (Fig. 1)
The tip blade 30 is an element for promoting excavation and earth removal of the ground by the spiral blade 20 .
In the present invention, the number of tip blades 30 must be two or more.
In this embodiment, four tip blades 30 are provided on the side circumference of the rotating shaft 10 between the helical blade 20 and the sharpened portion 11 at intervals of 90° in plan view. .
In the present invention, the tip blade 30 has a shape extending outward from the rotating shaft 10, and has at least a first inclined side 31, a second inclined side 32, and a connecting side 33. It can be set arbitrarily.
In the present invention, it is not essential that all tip blades 30 have the same shape.
The details of each side will be described below.

<4.1> First Inclined Side The first inclined side 31 is a part for promoting at least penetration of the tip blade 30 into the soil.
The first inclined side 31 has a shape in which the extension length toward the outside from the rotating shaft 10 gradually decreases toward the tip side of the rotating shaft 10 .
In the present invention, the angle of the acute-angled portion forming between the rotary shaft 10 and the first inclined side 31 is not particularly limited, but is preferably about 30°.
Since the first inclined side 31 pushes out obstacles such as roots in the soil to the outside as the penetration progresses, it is particularly difficult for the roots in the soil to get entangled with the tip of the boring tool A.

<4.1.1> Other Aspects In the present invention, the first inclined side 31 is any aspect within the range that it can act to push out obstacles such as roots in the soil to the outside. can be selected.
Therefore, in the present invention, it is not essential that the angle of inclination of the first inclined side 31 is always constant, but the first inclined side 31 may be curved or composed of a plurality of sides. can also

<4.2> Second slanted side The second slanted side 32 at least promotes the movement of obstacles such as gravel inside the soil and prevents clogging of the obstacles around the tip blade 30 . It is a part.
The second inclined side 32 has a shape in which the extension length toward the outside from the rotating shaft 10 gradually decreases toward the rear end side of the rotating shaft 10 .
In the present invention, the inclination angle of the second inclined side 32 is not particularly limited.

In addition, by securing a larger angle between the second inclined side 32 and the first inclined side 31 or the connecting side 33, an acute-angled portion that can be a weak portion is formed on the outer side of the tip blade 30. It also leads to the deterrence of
In addition, the tip blade 30 provided with the second inclined side 32 has a space (discharge space 40) formed on its upper side, and the discharge space 40 allows gravel to enter and exit. The surrounding area is less likely to be clogged with gravel.

<4.2.1> Other Aspects The inclination angle of the second inclined side 32 does not always have to be constant, and can be configured with a curved aspect or a plurality of sides.
Therefore, the configuration may be such that a side extending substantially horizontally from the other end side of the second inclined side 32 is connected to the rotating shaft 10 .
Any shape can be selected for these configurations as long as the purpose of preventing formation of an acute angle portion by the second inclined side 32 and preventing clogging of the discharge space 40 with gravel or the like is met.

<4.3> Connecting Edge The connecting edge 33 is a part for improving the strength of at least the tip blade 30 .
The connecting side 33 is a side whose overhanging length toward the outside from the rotating shaft 10 is substantially equal. By securing a large angle between the tip blade 30 and the tip blade 30, it is possible to suppress the formation of an acute-angled portion that may be a weak portion.
Further, in this embodiment, since the connecting side 33 is provided between the first inclined side 31 and the second inclined side 32, the shape of the tip blade 30 is such that the upper side is the connecting side 33 and the lower side is the rotation axis. A substantially trapezoidal shape with a contact side with 10 is exhibited.
This substantially trapezoidal tip blade leads to securing the area of the tip blade 30 as large as possible within the range of the rectangular region defined by the maximum width and maximum length of the tip blade 30, thereby improving the strength of the tip blade 30. can contribute to

<5> Relationship Between Spiral Blade and Tip Blade In the present invention, the following structure can be adopted for the relationship between the spiral blade 20 and the tip blade 30 .

<5.1> Setting the height of tip blade and spiral blade In the present invention, the top of each tip blade 30 and the bottom of the spiral blade 20 may be configured to be positioned at the same height.
According to the above configuration, since the soil in the portion where the tip blade 30 has completely penetrated is guided to the spiral blade 20 as it is, the soil removal effect by the spiral blade 20 is improved.

<5.2> Connection Height of Tip Blade and Spiral Wing A configuration in which it is connected to the blade 30 is also possible.
According to the above configuration, a gap is not formed on the circumferential direction side of the rotating shaft 10 between the tip blade 30 and the spiral blade 20, which are to be connected, so that problems such as pebbles being caught in the gap can be avoided. .

In this embodiment, three of the four tip blades 30 are provided with the first inclined side 31, the second inclined side 32 and the connecting side 33, and the remaining one blade (Fig. 1 The tip blade 30 on the front side of the spiral blade 20 is provided with a first inclined side 31 and a connecting side 33 , and the lowermost end 21 of the spiral blade 20 is connected to the connecting side 33 .
Further, in this embodiment, the second inclined sides 32 provided on three of the four tip blades 30 and the lower end portion of the spiral blade 20 connected to the remaining one tip blade 30 are arranged vertically. , but the present invention is not limited to this arrangement.
For example, by extending the length of the connecting side 33 connecting the lowermost end 21 of the spiral blade 20 to the contact position of the second inclined side 32 of the remaining tip blade 30 with the rotating shaft 10 , the tip blade 30 and the spiral blade 20 may be configured so as not to overlap in the vertical direction.

<6> How to Use FIG. 2 shows an image diagram of how the planting drill A according to the present invention is used.
(1) Start of excavation work (Fig. 2(a))
First, with the planting drill A according to the present invention attached to the power tool B, the pointed portion 11 is pierced into the substantially central portion of the planned excavation site for positioning.
After that, the power tool B is driven to start rotating the tip blade 30 and the spiral blade 20 .
(2) Formation of planting holes (Fig. 2(b))
Next, the drilling tool A for planting is inserted, and the excavation work is advanced to a predetermined depth to form a hole D to be a planting hole.
At that time, even if an obstacle such as the root C exists in the ground, the root C is pushed out into the soil outside the hole D first by the first inclined side 31 of the tip blade 30. It will be divided as follows.
As a result, the tip vane 30 and the helical blade 20 of the drilling tool A are less likely to be entangled with the root C, and the entanglement of the root C prevents the rotation of the tip vane 30 and the helical blade 20 to be interrupted, thereby eliminating the risk of boring.
In addition, since the gravel in the soil can enter and exit between the tip blades 30 by the discharge space formed outside the second inclined side 32 provided in the tip blade 30, clogging of gravel around the tip blade 30 is prevented. less likely to occur.
(3) Planting seedlings (Fig. 2(c))
After the excavation work has progressed to a predetermined depth, the seedling E is put into the hole D, and the excavated soil is returned to the hole D to fix the seedling E.

<7> Modification (Fig. 3)
Hereinafter, examples of the shape of the tip blade of the punching tool according to the present invention will be described.

<7.1> Configuration of only the first inclined side (Fig. 3(a))
In this embodiment, the tip blade 30 does not have the second inclined side 32 and the connecting side 33 provided in the first embodiment.
The upper end of the first inclined side 31 is connected to a substantially horizontal connecting side 34 extending from the rotating shaft 10, and the lowest end 21 of the spiral blade 20 is connected to the connecting side 34 at one tip blade 30. there is
According to this example as well, the first inclined side 31 can be used to push out the obstacle to the outside, thereby exerting a working effect.

<7.2> Configuration of only the first inclined side and the second inclined side (Fig. 3(b))
In the tip blade 30, the connection side 33 provided in the first embodiment is omitted.
This example also has the effect of pushing out obstacles to the outside and securing a large angle between the first slanted side 31 and the second slanted side 32 to suppress the formation of an acute-angled portion that can be a weak point. can be effective.
However, between the second inclined side 32 and the lowest end 21 of the helical blade, a gap having a width that gradually increases toward the outside of the rotating shaft is formed, so an obstacle such as gravel may be caught in the gap. It is also conceivable that
Therefore, it is necessary to pay attention to the use of the drilling tool according to this example at a site where relatively large pebbles or the like are assumed to exist in the soil.

<7.3> Configuration of only first inclined side and connecting side (Fig. 3(c))
In this embodiment, the tip blade 30 does not have the second inclined side 32 provided in the first embodiment.
This example also has the effect of pushing out obstacles to the outside and securing a large angle between the first slanted side 31 and the second slanted side 32 to suppress the formation of an acute-angled portion that can be a weak point. can be effective.

A Planting drill 10 Rotating shaft 11 Pointed part 20 Spiral blade 21 Bottom end 30 Tip blade 31 First inclined side 32 Second inclined side 33 Connecting side 34 Connecting side 40 Discharge space B Electric tool C Root D Hole E seedling

Claims (1)

A planting drill for forming a planting hole in the ground for planting seedlings such as trees and plants,
a rotating shaft rotatable by human power or driving force from an electric tool;
two or more tip blades provided near the tip of the rotating shaft and extending outward from the rotating shaft;
a helical blade provided on the outer periphery of the rotating shaft for excavating and discharging earth and sand upward;
at least
The tip blade is
a first inclined side having a lower end connected to the rotating shaft and having a shape in which the length of the projecting outward from the rotating shaft gradually decreases linearly toward the tip side of the rotating shaft ;
at least a connecting side that is provided upward so as to be continuous with the upper end of the first inclined side and has a shape in which the length of the protrusion outward from the rotation axis is approximately equal;
Of the two or more tip blades, the tip blade connected to the spiral blade,
The connecting side is connected to the lowest end of the spiral blade,
Of the two or more tip blades, the tip blade that is not connected to the spiral blade,
One end is connected to the upper end of the connecting side and the other end is connected to the rotating shaft, and the overhang length extending outward from the rotating shaft gradually decreases linearly toward the rear end side of the rotating shaft. and a second slanted side having a shape ,
Planting drill.

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