JP2006006260A - Weeding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a weeding device capable of simply and surely conducting weeding work in a narrow place and a narrow region. <P>SOLUTION: This weeding device is equipped with a rotation shaft 2 at a top end of a holding-type support rod 1, so that the shaft 2 extends in approximately parallel to a working plane, and is rotated and driven. The rotation shaft 2 is equipped with a grounding means the height of which is controlled, so that the shaft 2 is maintained in a fixed height from the ground surface. Blade bodies 3 which extend in the radial direction are mounted on a plurality of positions on the rotation shaft 2 in the longitudinal direction. Bottom parts of the blade bodies 3 are each axially supported by a radially-extending shaft of the rotation shaft 2, so as to be freely rotated, and top parts thereof are each formed into a working blade 5. When the rotation shaft 2 is rotated and the top parts of the blade bodies 3 axially supported on the rotation shaft 2 are contacted with the ground on which weeds are growing, the blade bodies 3 are rotated and moved in the reverse direction of the rotation in accordance with the rotation of the rotation shaft 3, and therefore the working blades 5 formed on the top ends of the blade bodies 3 draw the weeds, by moving in such a manner as to scrape against the ground surface. The weeding device is mounted on a commonly-known weed cutter as an attachment and conducts the weeding work. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  This invention has a working part attached to the tip of a hand-held support rod, and weeding that can efficiently perform operations such as weeding and leveling in a narrow place, a place where a large machine cannot enter, or a narrow range It relates to the device.

As a typical example of a working machine having a working unit that is driven to rotate at the tip of a hand-held support rod, a brush cutter that cuts away weeds and the like with a rotary blade is widely used. In general, weeding work in a narrow place or in a narrow area is generally performed manually, and there is a demand for effective and efficient weeding work by power. In response to such demands, weeding machines as disclosed in Patent Document 1 and Patent Document 2 have been proposed.
Japanese Patent No. 2899799 JP-A-8-187006

The weeding machine disclosed in Patent Document 1 has a cup-shaped wheel attached to the tip of a support rod provided with a driving means that is driven to rotate by an engine, and the paddy paddy mud is stirred by the end surface of the cup-shaped wheel. Weeding is performed. It is also disclosed that by forming protrusions on the end face of the wheel, weeding can be performed by stirring not only the paddy field but also the field soil surface.
Patent Document 2 discloses the idea of a weeding machine in which a rotor that is rotationally driven is attached to both ends of a tip of an operating rod.

The weeding machine disclosed in Patent Document 1 stirs the surface of the muddy soil and the field soil at the end face of the wheel that is rotated by the vertical rotation shaft, so that weed roots in the soil are removed. Is difficult, and the wheel itself is not stable because the wheel is grounded and rotated. Further, in the weeding machine described in Patent Document 2, since the directly grounded rotor rotates at a relatively low speed, a situation where weeding is impossible occurs depending on the situation of the grounding surface, which is sufficient on a hard ground surface or the like. It is hard to say that it can achieve its purpose.
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a weeding device that can perform weeding work in a narrow place or narrow range more easily and reliably. Another object is to provide a structure that can be attached to a widely used brush cutter and used as a weeding device.

  In order to achieve the above-mentioned object, the present invention provides a rotating shaft 2 that extends substantially parallel to the ground surface and is driven to rotate at the tip of a hand-held support rod 1. The rotary shaft 2 rotates at high speed while maintaining a certain height from the ground surface, that is, the work surface, by providing a grounding means capable of adjusting the height. Further, the rotary shaft 2 is provided with blades 3 in a radial direction at a plurality of positions in the axial direction, and the blade body 3 is pivotally supported by a support shaft 4 in the axial direction of the rotary shaft 2 so as to be rotatable. Then, an arbitrarily shaped work blade 5 suitable for weeding work, leveling or grinding of rough soil on the ground surface is formed at the distal end portion of the blade body 3 on which the base end portion is pivotally supported.

  When the rotary shaft 2 rotates and the tip of the blade body 3 supported by the rotary shaft 2 hits the ground on which weeds grow, the blade body 3 moves as the rotary shaft 2 rotates. At this time, the blade body 3 moves so that the front working blade 5 rubs the ground surface and pulls out the weeds. Since the blade body 3 is pivotally supported with respect to the rotating shaft 2, the blade body 3 rotates rearward in the moving direction according to the hardness of the ground surface. That is, in the case of a hard ground, it moves so as to drag the ground surface without applying an excessive load, and in the case of a soft ground, the ground moves to some extent and is pulled.

In the present invention, a known brush cutter can be used as it is as a weeding device. That is, the hand-held support rod 1 is provided with a power source for rotational driving such as an engine 6 or a motor at a base end portion, and a brush cutter provided with a drive shaft 7 for rotationally driving a rotary blade at the tip end. The rotary shaft 2 having a blade 3 for weeding instead of the rotary blade is detachably mounted.
The blade body 3 that is pivotally supported with respect to the rotating shaft 2 projects support pieces 8 at a plurality of positions on the rotating shaft 2, and the base end portion of the blade body 3 having the working blade 5 at the tip is parallel to the rotating shaft. It can be supported by the support shaft 4.

  According to the weeding device of the present invention, the blade body 3 extending in the radial direction is provided on the rotating shaft 2 rotating at a certain height from the ground surface. Therefore, the tip of the blade body 3 hits the ground surface by the rotation of the rotary shaft 2, and the weeding work is performed by the rotational movement of the blade body 3. At this time, since the blade body 3 is supported by the support shaft 4 parallel to the rotation shaft 2, the blade body 3 itself freely rotates to the rear of the rotation, and in the case of hard ground, the ground surface or the ground surface is shallow. It moves so that it cuts, weeds can be pulled out efficiently, and weeding work can be performed safely and efficiently without applying an excessive load to the rotating shaft. In the weeding apparatus according to the present invention, not only the weeding work but also the leveling work and the ground surface crushing work can be performed. Such work can be speedily advanced in a standing posture without the operator bending down.

  According to the weeding apparatus of Claim 2, the already used brush cutter can be effectively utilized as a weeding apparatus by providing inexpensively as a weeding attachment to a widely used brush cutter. According to the third aspect of the present invention, the support piece 8 is protruded at a plurality of positions of the rotary shaft 2 and the base end portion of the blade body 3 having the working blade 5 at the tip is pivotally supported. The blade body 3 can be easily exchanged.

Hereinafter, preferred embodiments of a weeding device according to the present invention will be described with reference to the accompanying drawings.
1 is a perspective view of a weeding device with a part cut away, FIG. 2 is a perspective view showing a state in which the weeding device is attached to the tip of a brush cutter, FIG. 3 is a longitudinal sectional view cut in the direction of the rotation axis, and FIG. It is the longitudinal cross-sectional view cut | disconnected in the direction orthogonal to an axis | shaft.

  As shown in FIGS. 1 and 3, a weeding device is attached to the tip of a hand-held support rod 1. The weeding device includes a rotating shaft 2 that extends substantially parallel to the ground surface and is driven to rotate. The rotating shaft 2 can be maintained at a constant height from the ground surface, that is, the work surface by providing a grounding means capable of adjusting the height. That is, a grounding means capable of adjusting the height is provided in the casing 9 on which the rotary shaft 2 is mounted. The grounding means may be, for example, a caster, but in the illustrated example, hook-shaped guide plates 10 are provided on the left and right side portions of the casing 9. This guide plate 10 has a fixed plate 13 having a rear end portion pivotally supported on a side plate 9a of the casing 9 by a shaft 11, and an arc-shaped long hole 12 having a radius up to the shaft 11 at the front end portion. The guide plate 10 is rotated to an arbitrary position and is fixed to the side plate 9a of the casing 9 by using bolts 14. Therefore, the height from the ground surface to the rotating shaft 2 can be freely adjusted by loosening the bolt 14 and rotating the guide plate 10 and tightening the bolt 14 at an arbitrary desired position. In other words, the depth of the blade body 3 that hits the ground surface can be adjusted.

  A gear head 15 is provided at the tip of the support rod 1, and the gear head 15 is fixed to the side plate 9 a of the casing 9 with bolts 16. That is, as shown in FIGS. 2 and 3, the engine 6 is attached to the base end portion of the support rod 1, and the bevel gear 17 in the gear head 15 is driven by the shaft 22 that penetrates the inside of the support rod 1. The drive shaft 7 is driven by engaging the bevel gear 17 with the bevel gear 18 fixed to the drive shaft 7. A mounting screw is formed at the tip of the drive shaft 7, and the rotary shaft 2 is driven by connecting the drive shaft 7 to the rotary shaft 2.

  A plurality of blade bodies 3 extending in the radial direction are attached to the rotating shaft 2. That is, the support pieces 8 and 8 are fixed at a plurality of positions in the axial direction, and the blade body 3 is pivotally supported by the support piece 8 by the support shaft 4 in the same direction as the rotary shaft 2. At this time, as shown by a two-dot chain line in FIG. 4, the blade body 3 has a dimension that can be adjusted to a length that the tip of the blade body 3 reaches deeper than the ground surface as indicated by a solid line from the position that reaches the ground surface. deep. Further, the blade body 3 may be supported by the rotary shaft 2 itself so that a recess is formed on the surface of the rotary shaft 2 and the base end portion of the blade body 3 is pivotally supported in the recess. However, by fixing the support piece 8 to the rotary shaft 2 and pivotally supporting the blade body 3 on the support piece 8 as in the illustrated example, the blade body 3 can be easily attached and the blade body 3 can be attached. Can be easily replaced.

  When performing the weeding operation with the above-described weeding apparatus according to the present invention, the rotating shaft 2 rotates at a high speed regardless of the forward speed of the airframe. When the rotating shaft 2 rotates and the working blade 5 of the blade body 3 attached to the rotating shaft 2 reaches the ground surface as shown in FIG. 5A, the working blade 5 of the blade body 3 is rotated by the rotating shaft 2. It moves so as to be dragged by the ground surface. That is, the rotation trajectory of the three support shafts 4 supporting the base end portion of the blade body 3 moves in the rotation direction and moves downward by the rotation of the rotation shaft 2. Then, due to the resistance acting on the working blade 5, the blade body 3 itself rotates about the support shaft 4, and the working blade 5 moves so as to drag the ground surface as shown in FIG. Remove. When the working blade 5 passes through the ground contact portion, the blade body 3 that is pivotally supported by the inertia of rotation returns to the radial direction of the rotating shaft 2, and the rotating shaft 2 rotates in a balanced manner.

  If the work surface to be weeded, that is, the ground surface is hard and has a high resistance, the work blade 5 enters the ground surface to a slight extent, and if the ground surface is soft, the work blade 5 enters a little deeper. . As described above, the blade body 3 can be effectively weeded without being subjected to excessive resistance regardless of the state of the work surface. However, the inertia of the blade body 3 is caused by the rotation of the rotary shaft 2, and the work blade 5 strongly collides with the ground surface at the moment of grounding and enters from the ground surface to some extent, so that weeds behind this position can be reliably secured. Can be weeded. Further, although depending on the traveling speed of the entire weeding device, the work blade can be leveled by passing a position very close to the previous rotation locus. Moreover, when the working blade 5 of the blade body 3 strongly collides with the ground surface, the lump on the ground surface can be effectively pulverized.

  Conventional blades that perform weeding work with rotating blades, such as those attached to paddy field weeding devices and tillers and used for leveling and weeding, have relatively low-speed rotation. On the other hand, in a general brush cutter, the operation is performed by cutting the weeds by high-speed rotation of the blade plate. Specifically, as an example, an engine output of 6000 to 8000 revolutions per minute is carried out with a reduction of the gear of the gear head while the drive shaft 7 is rotating at a high speed of 2000 to 3000 revolutions per minute. Yes. Therefore, it cannot be used as a weeding machine by using the power mechanism of the brush cutter as it is and changing the blade body of the brush cutter. On the other hand, in the present invention, the blade body 3 is freely rotated with respect to the rotary shaft 2 and is not subjected to an excessive load. Therefore, the power transmission means of a generally used brush cutter is used as it is. Can be used as a weeder.

  That is, the weeding device shown in FIG. 1 in which the rotating shaft 2 is stored in the casing 9 is used as a weeding attachment, and as shown in FIG. 2, the brush cutter can be used as a weeding machine by attaching it to the gear head portion of the brush cutter. . Specifically, the flange portion of the gear head 15 from which the rotary blade for trimming is removed is fixed to the side plate 9 a of the casing 9. At this time, the drive shaft 7 protruding from the gear head 15 is connected to the rotating shaft in the casing 9. The gear head 15 is used in a state in which the drive shaft 7 faces in the lateral (horizontal) direction in a state where the operator supports it.

The specific shapes of the blade body 3 attached to the rotary shaft 2 and the working blade 5 formed on the blade body 3 are not particularly limited, and can be formed in an arbitrary shape according to the application.
In the embodiment shown in FIG. 6, the working blade 5 is formed on the blade body 3 so as to be substantially L-shaped, and the blade portions 5 a are formed on both front and rear edges of the working blade 5. In the blade body 3 shown in FIG. 6, when the blade portion 5a formed on one side edge is worn out by use, the blade portion 5a formed on the other side edge is inverted by turning the blade body 3 at the front end of rotation. Can be used. An attachment hole 19 for attaching to the support piece of the rotating shaft is formed in the upper part of the working blade body 3 for weeding.

The angle α formed by the main portion of the blade body 3 and the working blade 5 may be an L-shape of approximately 90 degrees as shown in FIG. 6, but is formed into an acute-angle V-shape smaller than 90 degrees. May be. In this case, the V-shaped tip is grounded, and it is easy to bite into the ground surface, which is effective for removing the roots of weeds. Moreover, as shown in FIG. 8, it can also form in the obtuse angle | corner shape larger than 90 degree | times. In this case, the distal end portion of the blade-shaped blade 3 that is in the shape of a letter can penetrate deeper into the ground from the ground surface, and can reliably dig up the roots of weeds. At this time, since the blade body 3 enters obliquely with respect to the ground surface, there is little entry resistance and the operation can proceed smoothly.
As shown in FIG. 9 as an example, the working blade 5 of the blade body 3 can be formed in a triangular shape in order to improve the cutting.

  The embodiment shown in FIG. 7 shows another embodiment of the blade body 3, in which a flat work blade 5 is fixed to the tip of the main portion of the blade body 3 in the tangential direction of rotation. V-shaped cuts 20 and 20 are formed at the front end and the rear end of the flat work blade 5, and a blade portion 21 is formed at the inner edge of the V-shaped cut 20. In this embodiment, the roots of the weeds enter the cut 20 of the working blade 5 that moves slightly in contact with the ground surface or moves substantially in contact with the ground surface, so that the roots of the weeds are pulled out, and the roots are effectively left as much as possible. Can be realized. The blade body 3 shown in FIG. 7 can use the new blade portion 21 for weeding work by reversing the blade body 3 when the blade portion 21 is worn away by use.

FIG. 1 is a perspective view of a weeding device with a part cut away, FIG. 2 is a perspective view showing a state in which the weeding device is mounted on the tip of a brush cutter and used. FIG. 3 is a longitudinal sectional view of the whole weeding device cut in the direction of the rotation axis, FIG. 4 is a longitudinal sectional view cut in a direction perpendicular to the rotation axis, FIG. 5 is a schematic diagram showing the process of weeding work by the weeding device, FIG. 6 is a perspective view showing an embodiment of the blade body, FIG. 7 is a perspective view showing another embodiment of the blade body. FIG. 8 is a perspective view showing still another embodiment of the blade body, FIG. 9 is a perspective view of a blade body showing still another embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Support rod, 2 ... Rotating shaft, 3 ... Blade body, 4 ... Support shaft, 5 ... Work blade, 5a ... Blade part, 6 ... Engine, 7 ... Drive shaft, 8 ... Support piece, 9 ... Casing, 9a ... Side plate, 10 ... guide plate, 11 ... shaft, 12 ... long hole, 13 ... fixing plate, 14 ... bolt, 15 ... gear head, 16 ... bolt, 17,18 ... bevel gear, 19 ... mounting hole, 20 ... notch, 21 ... Blade, 22 ... Shaft.

Claims (3)

  Provided at the tip of the hand-held support rod is a rotating shaft that extends substantially parallel to the work surface and is driven to rotate, and the rotating shaft is provided with a grounding means to maintain a constant height from the ground surface, and the rotating shaft. Is provided with a blade in a radial direction at a plurality of positions in the axial direction, the blade supports the base end of the blade so as to be rotatable with respect to the axis in the axial direction of the rotating shaft, and a working blade at the tip. A weeding device characterized by being formed.   A hand-held support rod is a brush cutter having a power source for an engine or a motor at the base end and a drive shaft for rotating the rotary blade at the tip, and the rotary shaft is replaced with the rotary blade of the brush cutter. The weeding device according to claim 1, wherein the weeding device is detachably attached.   The weeding device according to claim 1 or 2, wherein a support piece is protruded at a plurality of positions of the rotating shaft, and a base end portion of a blade body having a working blade at the tip is pivotally supported.

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