JP7129092B2 - Blade replaceable brush cutter - Google Patents

Blade replaceable brush cutter Download PDF

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JP7129092B2
JP7129092B2 JP2019212028A JP2019212028A JP7129092B2 JP 7129092 B2 JP7129092 B2 JP 7129092B2 JP 2019212028 A JP2019212028 A JP 2019212028A JP 2019212028 A JP2019212028 A JP 2019212028A JP 7129092 B2 JP7129092 B2 JP 7129092B2
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blade
brush cutter
desk
cutting blade
disk
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JP2021083317A (en
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孝昭 岩本
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合同会社昊昌林協
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Description

この発明は刈刃交換型の刈刃交換型刈払機に関する。 The present invention relates to a blade replaceable brush cutter.

従来線状刈刃付の刈刃交換型の刈払機として特許文献1に示すように上部開放型の皿状の回転デスク(円盤)の周壁外周から先端が突出するように複数本の刈刃が各別に且つ取付交換可能に取付けられたものが知られている。 As disclosed in Japanese Patent Application Laid-Open No. 2002-100000, a blade-replaceable brush cutter with a conventional linear cutting blade has a plurality of cutting blades whose tips protrude from the outer circumference of the peripheral wall of a dish-shaped rotating disk (disc) with an open top. Separately and interchangeably mounted ones are known.

また、特許文献2に示すように樹脂製のコード刃をデスクと同心に軸支されたリールに巻付け、その先端を必要長さに応じて繰り出すものが提案されている。 Further, as shown in Patent Document 2, there has been proposed a method in which a resin cord blade is wound around a reel concentrically supported on a disk and the tip thereof is fed out according to the required length.

実用新案登録第3136785号公報Utility Model Registration No. 3136785 国際公開2009-37767号公報International Publication No. 2009-37767

しかし上記特許文献1の刈払機は、紐状の刈刃を基端部の結び目を係止部としてデスク周壁に外向きに挿通係止しているので、刈刃の差換交換は可能であるが、刈刃先端が摩耗や切断によって短寸になり又は細くなった場合は、すべて新品の刈刃と交換する必要があるほか、交換の都度定寸へのカッティングや結び目形成が必要である。 However, in the lawn mower of Patent Document 1, the string-like cutting blade is inserted outwardly into the desk peripheral wall with the knot at the base end serving as a locking portion and locked, so that the cutting blade can be replaced. However, when the tip of the cutting blade becomes short or thin due to wear or cutting, it is necessary to replace it with a new cutting blade, and it is necessary to cut it to the specified size and tie a knot each time it is replaced.

また特許文献2に記載の刈払機は、刈刃が摩耗や切断によって欠損した場合は、リールから必要長さだけ繰り出して欠損を補うことができるものの、刈払部に大きいスペースを取り重量のあるリールを設けているので、刈払機自体の重量が過大になり作業者の負担が大きくなるほか、デスク回転のイナーシャも大きく作業性が悪いという欠点がある。 Further, in the brush cutter disclosed in Patent Document 2, when the cutting blade is damaged due to wear or cutting, it is possible to make up for the damage by extending the required length from the reel, but the cutting portion requires a large space and is heavy. Since the reel is provided, the weight of the bush cutter itself becomes excessive, which increases the burden on the operator.

上記課題を解決するための本発明の刈払機は、第1に、回転するデスク3に先端が外周方向に突出する線材状の刈刃6の基端部を着脱交換可能に取付けた刈刃交換型刈払機であって、上記デスク3と刈刃6の基端部側のナット部11とボルト部6aとを備えた刈刃取付用の取付部7を設け、上記ボルト部6aとナット部11ののねじ込み深さを調節することによりデスク外周からの刈刃6の突出長さを調節する機構としたことを特徴としている。 The brush cutter of the present invention for solving the above-mentioned problems is firstly provided with an exchangeable cutting blade in which the base end of a wire-shaped cutting blade 6 whose tip protrudes in the outer peripheral direction is detachably attached to a rotating desk 3. This brush cutter is provided with a mounting portion 7 for mounting the cutting blade, which includes a nut portion 11 on the base end side of the desk 3 and the cutting blade 6, and a bolt portion 6a. The mechanism is characterized by adjusting the projection length of the cutting blade 6 from the outer circumference of the disk by adjusting the screw-in depth of the blade .

に、ボルト部6a側にねじ込まれ、ねじ込み深さを任意の位置でロックするロックナット12を設けてなることを特徴としている。 Secondly , it is characterized in that it is provided with a lock nut 12 that is screwed into the bolt portion 6a and locks the screwing depth at an arbitrary position.

に、取付部7がデスク側に固定的に設けたナット部11と刈刃6側に上記ナット部11にねじ込まれるボルト部6aとを備えてなることを特徴としている。 Thirdly , the mounting portion 7 is characterized by comprising a nut portion 11 fixedly provided on the desk side and a bolt portion 6a screwed into the nut portion 11 on the cutting blade 6 side.

に、刈刃6が所定の弾力性と剛性を備えたスチール製又はプラスチック製又はFRP製であることを特徴としている。 Fourthly , the cutting blade 6 is characterized by being made of steel, plastic, or FRP with predetermined elasticity and rigidity.

に、刈刃6を少なくとも4本以上の複数本設けたことを特徴としている。 Fifth , it is characterized in that a plurality of at least four cutting blades 6 are provided.

に、刈刃6のデスク外周からの突出角が回転方向に傾斜した迎え角θを形成してなることを特徴としている。 Sixthly, it is characterized in that the cutting blade 6 protrudes from the outer circumference of the disk at an angle of attack .theta. inclined in the direction of rotation.

に、取付部7を覆う平面視円形の保護カバー13を設けてなることを特徴としている。 Seventhly, it is characterized in that a protective cover 13 having a circular shape in plan view is provided to cover the mounting portion 7 .

に、デスク3の上面に刈刃6を収容しデスク中心側から外周側に向う凹溝9を形成してなることを特徴としている。 Eighth , the disk 3 is characterized in that a cutting blade 6 is accommodated on the upper surface of the disk 3, and a concave groove 9 extending from the disk center side to the outer peripheral side is formed.

に、デスク3の底面に山形に突出しデスク3と同心円を形成するリング状のガード部8を設けてなることを特徴としている。 A ninth feature is that a ring-shaped guard portion 8 is provided on the bottom surface of the desk 3 so as to protrude in a mountain shape and form a concentric circle with the desk 3 .

10に、保護カバー13をデスク3を回転可能に軸支するギヤボックス2側又はデスク3側のいずれかに取付けてなることを特徴としている。 Tenthly , the protective cover 13 is attached to either the gear box 2 side or the desk 3 side which rotatably supports the desk 3 .

以上のように構成される本発明によれば、以下のような効果を奏する。
(1)デスク外周から突出する刈刃の突出長さが摩耗や欠損等によって所要突出量以下になった際に、ボルト部とナット部によるねじ調節によって任意に長さ調節できる利点があり、ロックナットにより当初の長さの設定を含め、突出長さの固定ができる。
According to the present invention configured as described above, the following effects can be obtained.
(1) When the protruding length of the cutting blade protruding from the outer periphery of the desk becomes less than the required protruding length due to wear or chipping, it has the advantage of being able to be arbitrarily adjusted by adjusting the bolt and nut sections. A nut allows fixing of the protruding length, including setting the initial length.

(2)刈刃は弾力性と剛性を有する線材状なので、デスク回転により確実に草木の刈払を行い、これを4本以上突出させることにより連続的な断ち切りにより太目の草木でも刈払性能を保持し、回転方向に傾斜した迎え角を形成することにより、草木の捕捉性能も向上する。 (2) Since the cutting blades are in the form of wires with elasticity and rigidity, they reliably cut grass and trees by rotating the desk. By holding and forming an angle of attack inclined in the direction of rotation, the ability to catch plants is also improved.

(3)取付部上側の保護カバーにより、デスク回転中のボルト部,ナット部からなる取付部の損傷や摩耗が防止でき、刈刃が放射方向の凹溝内に収容されることによって刈刃の保護ができ、刈払時の刈刃の基端側の支持や姿勢保持が強化される。 (3) The protective cover on the upper side of the mounting portion prevents damage and wear of the mounting portion consisting of bolts and nuts during rotation of the disk. The blade can be protected, and the base end side of the cutting blade can be supported and the posture can be maintained during cutting.

(4)デスク裏面側にリング状のガード部を設けることにより、デスク回転時に裏面中心のデスク取付用ボルト,ナット等の地面側の障害物への接衝による損傷が防止されるほか、刈刃も地表からリング状ガード部高さだけ浮かされるので、刈刃の保護にもなり、デスク回転もスムースになる。 (4) By providing a ring-shaped guard on the back side of the desk, damage caused by contact with obstacles on the ground side such as desk mounting bolts and nuts at the center of the back when the desk rotates is prevented. Since the ring-shaped guard is raised above the ground surface, it protects the cutting blade and the desk rotates smoothly.

本発明刈払機の回転デスク部の全体斜視図である。1 is an overall perspective view of a rotating desk portion of the bush cutter of the present invention; FIG. 回転デスク部の断面図である。FIG. 4 is a cross-sectional view of the rotating desk portion; (A)は刈刃の取付構造を示す刈刃方向に沿った拡大断面図、(B)は回転デスクの取付部を示す弦方向の拡大断面図である。(A) is an enlarged cross-sectional view along the cutting blade direction showing the mounting structure of the cutting blade, and (B) is an enlarged cross-sectional view in the chord direction showing the mounting portion of the rotating disk. 刈刃のボルト部と刈刃本体の結合部を示す拡大断面図である。Fig. 4 is an enlarged cross-sectional view showing a coupling portion between the bolt portion of the cutting blade and the cutting blade main body; 本発明の第2実施形態を示すデスク部の断面図である。It is a sectional view of a desk part showing a 2nd embodiment of the present invention. (A)は第2実施形態刈刃方向に沿った拡大断面図、(B)は回転デスクの取付部を示す弦方向の拡大断面図である。(A) is an enlarged cross-sectional view along the cutting blade direction of the second embodiment, and (B) is an enlarged cross-sectional view in the chord direction showing the mounting portion of the rotating disk.

図1~図4は本発明実施形態を示し、図1,図2に示すヘッド部1は、柄1の先端にギヤボックス2、回転駆動する板金製で円板状のデスク3が、回転軸4に軸支されており、デスク3の上面には無負荷状態では直線状を保つ一定の弾力性と剛性を備えた鋼線(ワイヤ),硬質プラスチック材又はFRP等からなる線材状の多数(本例では16本)の刈刃6が、取付部7を介して且つ先端がデスク周面より突出する状態で斜め放射状に取付けられている。刈刃自体は刈払性能を発揮するため少なくとも4本以上が望ましい。 FIGS. 1 to 4 show an embodiment of the present invention. A head portion 1 shown in FIGS. 1 and 2 includes a gear box 2 at the tip of a handle 1, a disc-shaped desk 3 made of sheet metal to be rotationally driven, and a rotating shaft. 4, and on the upper surface of the desk 3, a large number of wire-shaped wires (wires) made of steel wire, hard plastic material, FRP, etc., having a certain elasticity and rigidity that maintains a straight shape in an unloaded state ( In this example, 16 cutting blades 6 are mounted in an oblique radial pattern through mounting portions 7 with their tips protruding from the peripheral surface of the desk. At least four cutting blades are desirable in order to exhibit cutting performance.

デスク3は図示するように、デスク外周より中心寄りの同心円を形成する下向きの山型断面(上面では湾曲断面の溝)からなるガード部8が形成されるとともに、表面(上面)側には上記ガード部8上の溝に通じる凹溝9が、デスク回転方向に傾斜した迎え角θを形成して凹設形成されている。刈刃6はこの凹溝9内に収容されて設置され、取付部7はこの凹溝9内のリング状のガード部8上の溝の外周側に設置されている。迎え角θを付すことにより、デスク回転時の草木類の捕捉と刈刃切断の性能を高めることができる。 As shown in the figure, the desk 3 is formed with a guard portion 8 having a downward mountain-shaped cross section (a groove with a curved cross section on the upper surface) forming concentric circles closer to the center than the outer periphery of the desk, and a guard portion 8 on the surface (upper surface) side. A recessed groove 9 communicating with the groove on the guard portion 8 is recessed to form an angle of attack .theta. The cutting blade 6 is accommodated in the groove 9, and the mounting portion 7 is provided on the outer circumference of the groove on the ring-shaped guard portion 8 in the groove 9. As shown in FIG. By providing the angle of attack θ, it is possible to improve the performance of catching plants and cutting blades during the rotation of the desk.

取付部7は、凹溝9内に突設されたブロック状又はリブ状のナット部11と、刈刃6の基端部側を構成するボルト部6aとを備え、刈刃6は上記ボルト部6aをナット部11にねじ込むことにより、その先端のデスク外周からの突出長さをねじ操作により調節可能にデスク3に取付けられ、ボルト部6aには、上記刈刃6の取付位置をナット部11との間で固定的にセットするロックナット12がねじ込まれている。
上記ナット部11は、溶接又はスポット溶接等により固着し又はデスク3の板材を打抜いて折り曲げ起立させて形成しても良い。
The mounting portion 7 includes a block-shaped or rib-shaped nut portion 11 projecting into the recessed groove 9, and a bolt portion 6a forming the base end side of the cutting blade 6. The cutting blade 6 is attached to the bolt portion. By screwing the cutting blade 6a into the nut portion 11, the projection length of the distal end from the outer periphery of the desk can be adjusted by screwing. A lock nut 12 is screwed in to be fixedly set between.
The nut portion 11 may be fixed by welding, spot welding, or the like, or may be formed by punching a plate material of the desk 3, bending it, and erecting it.

デスク3の上面側には、上記各刈刃6の取付部7を上面から覆い、草や蔓類のデスク側への巻付けを防止するとともに、上記取付部7を保護するための皿状の保護カバー13が設けられ、保護カバー13の中心側には上端のフランジ部14を介してギヤボックス2の下端に着脱可能に取付けられる上向きの円筒状のジョイント部16が設けられている。また保護カバー13の外周下端は、デスク3上の平坦面に摺動可能に接触しても良いし、図3に示すように、蔓類等を巻込まない程度の僅かなクリアランスを設けても良い。 On the upper surface side of the desk 3, there is a dish-shaped plate which covers the mounting portion 7 of each of the cutting blades 6 from the upper surface to prevent grass and vines from winding around the desk side and to protect the mounting portion 7. A protective cover 13 is provided, and an upward cylindrical joint portion 16 that is detachably attached to the lower end of the gear box 2 via a flange portion 14 at the upper end is provided at the center side of the protective cover 13 . The lower end of the outer circumference of the protective cover 13 may slidably contact the flat surface on the desk 3, or may be provided with a slight clearance to prevent vines and the like from getting caught, as shown in FIG. .

刈刃6は全体を弾力性を備えた線状の鋼材で形成し、その基端部をボルト部6aとして形成することもでき、同様に硬質プラスチック材や炭素繊維強化プラスチック等のFRP製で形成することも可能である。 The cutting blade 6 can be made entirely of elastic linear steel, and its base end can be formed as a bolt portion 6a. It is also possible to

図4は基端部側のボルト部6aを金属製とし、その先端側の中空の筒状部6cに刃部材6bを差込み、かしめ加工又は接着等により一体的に取付けて形成したものを示している。いずれの場合も刃部材6bに相当する部分は無負荷状態では直線状を保ち刈払作業時は刈払抵抗に応じて弾力変形しながら草木の捕捉と切断ができる弾力性を備えており、いずれの場合も刃部材6bの断面は円形断面の他、草木の切断に有利な多角形断面又はその他の異形断面であっても良い。 FIG. 4 shows that the bolt portion 6a on the base end side is made of metal, the blade member 6b is inserted into the hollow cylindrical portion 6c on the tip side, and the bolt portion 6a is integrally attached by caulking or adhesion. there is In either case, the portion corresponding to the blade member 6b maintains a straight shape in an unloaded state and has elasticity that enables it to capture and cut plants while elastically deforming according to the resistance to weeding during mowing work. In the case of (2), the cross section of the blade member 6b may be a circular cross section, a polygonal cross section that is advantageous for cutting plants, or other irregular cross sections.

またデスク3は、図2に示すようにリング状のガード部8を形成することにより、中心部の裏側に皿状の凹部17が形成されており、回転軸4はこの皿状凹部17が形成されている。回転軸4はこの皿状部17の中心にナット締めによってデスク3を取付け固定されている。さらに皿状凹部17(ガード部8の裏面内側)には、中心のデスク3の取付機構を保護する裏面カバー18がねじ込みその他の固定手段により、着脱可能に取付けられている。 As shown in FIG. 2, the desk 3 is formed with a ring-shaped guard portion 8 to form a dish-shaped recess 17 on the back side of the central portion. It is The rotating shaft 4 has the desk 3 attached and fixed to the center of the dish-shaped portion 17 by tightening a nut. Further, a back cover 18 for protecting the attachment mechanism of the central desk 3 is detachably attached to the dish-shaped concave portion 17 (inside the back surface of the guard portion 8) by screwing or other fixing means.

図5,図6はこの発明の他の実施形態を示し、この例では保護カバー13が、刈刃6の取付部7を覆うようにデスク3の上面側に固定的に取付けられ、この例ではブロック状のナット部11にスポット溶接等により一体的に取付けられている。 5 and 6 show another embodiment of the present invention. In this example, a protective cover 13 is fixedly attached to the upper surface of the desk 3 so as to cover the attachment portion 7 of the cutting blade 6. It is integrally attached to the block-shaped nut portion 11 by spot welding or the like.

したがって図示する例では、ロックナット12をねじ操作するためには、デスク中心側から挿入する筒状のボックススパナ(図示しない)が必要となる。尚、保護カバー13は、ボルト等によりデスク3上に浮上状態で着脱可能に取付けることもできる。このタイプの保護カバーはデスク3と一体回転する機構である。 Therefore, in the illustrated example, a cylindrical box spanner (not shown) inserted from the center side of the desk is required to screw the lock nut 12 . The protective cover 13 can also be detachably mounted on the desk 3 in a floating state by means of bolts or the like. This type of protective cover is a mechanism that rotates together with the desk 3 .

また、図1~4に示す実施形態のものでは、取付部7の刈刃6の軸線の傾きにより刈刃6がデスク3の水平面に対し外側に向って下向きに取付られている。図5~6に示す例ではデスク3と同様に水平方向に突出しているが、両者は草木の刈払高さに多少の違いがある。図5~6に示す実施形態のその他の部分は前述した実施形態のものと共通しており、部材等の符号も共通させて図示している。 1 to 4, the cutting blade 6 is mounted outward and downward with respect to the horizontal surface of the desk 3 due to the inclination of the axis of the cutting blade 6 of the mounting portion 7. As shown in FIG. In the example shown in FIGS. 5 and 6, the desk 3 protrudes in the horizontal direction like the desk 3, but there is a slight difference in the grass cutting height between the two. Other parts of the embodiment shown in FIGS. 5 and 6 are common to those of the above-described embodiment, and reference numerals for members and the like are also shown in common.

2 ギヤボックス
3 デスク
4 回転軸
6 刈刃
6a ボルト部
7 取付部
8 ガード部
9 凹溝
11 ナット部
12 ロックナット
13 保護カバー
17 皿状凹部
18 裏面カバー
2 gear box 3 desk 4 rotary shaft 6 cutting blade 6a bolt portion 7 attachment portion 8 guard portion 9 concave groove 11 nut portion 12 lock nut 13 protective cover 17 dish-shaped concave portion 18 rear cover

Claims (10)

回転するデスク(3)に先端が外周方向に突出する線材状の刈刃(6)の基端部を着脱交換可能に取付けた刈刃交換型刈払機であって、上記デスク(3)と刈刃(6)の基端部側のナット部(11)とボルト部(6a)とを備えた刈刃取付用の取付部(7)を設け、上記ボルト部(6a)とナット部(11)ののねじ込み深さを調節することによりデスク外周からの刈刃(6)の突出長さを調節する機構とした刈刃交換型刈払機。 A blade-exchangeable brush cutter in which the base end of a wire-shaped cutting blade (6) whose tip protrudes in the outer peripheral direction is detachably attached to a rotating disk (3), wherein the disk (3) and the cutting blade are attached. A mounting portion (7) for mounting the cutting blade, which includes a nut portion (11) on the base end side of the blade (6) and a bolt portion (6a), is provided, and the bolt portion (6a) and the nut portion (11) are provided. A blade replaceable brush cutter having a mechanism for adjusting the projection length of the blade (6) from the outer periphery of the desk by adjusting the screw-in depth of the blade. ボルト部(6a)側にねじ込まれ、ねじ込み深さを任意の位置でロックするロックナット(12)を設けてなる請求項に記載の刈刃交換型刈払機。 2. A brush cutter of replaceable blade type according to claim 1 , further comprising a lock nut (12) which is screwed into the bolt portion (6a) and locks the screwing depth at an arbitrary position. 取付部(7)がデスク側に固定的に設けたナット部(11)と刈刃(6)側に上記ナット部(11)にねじ込まれるボルト部(6a)とを備えてなる請求項1又は2のいずれかに記載の刈刃交換型刈払機。 2. The mounting portion (7) comprises a nut portion (11) fixedly provided on the desk side and a bolt portion (6a) screwed into the nut portion (11) on the cutting blade (6) side. 3. The blade-exchangeable brush cutter according to any one of 2 . 刈刃(6)が所定の弾力性と剛性を備えたスチール製又はプラスチック製又はFRP製である請求項1~のいずれかに記載の刈刃交換型刈払機。 The blade-exchangeable brush cutter according to any one of claims 1 to 3 , wherein the cutting blade (6) is made of steel, plastic, or FRP having predetermined elasticity and rigidity. 刈刃(6)を少なくとも4本以上の複数本設けた請求項1~のいずれかに記載の刈刃交換型刈払機。 The blade-exchangeable brush cutter according to any one of claims 1 to 4 , wherein at least four or more cutting blades (6) are provided. 刈刃(6)のデスク外周からの突出角が回転方向に傾斜した迎え角(θ)を形成してなる請求項1~のいずれかに記載の刈刃交換型刈払機。 The blade-exchangeable brush cutter according to any one of claims 1 to 5 , wherein the angle of projection of the cutting blade (6) from the outer circumference of the disk forms an angle of attack (θ) inclined in the direction of rotation. 取付部(7)を覆う平面視円形の保護カバー(13)を設けてなる請求項1~のいずれかに記載の刈刃交換型刈払機。 The blade replaceable brush cutter according to any one of claims 1 to 6 , further comprising a protective cover (13) which is circular in plan view and covers the mounting portion (7). デスク(3)の上面に刈刃(6)を収容しデスク中心側から外周側に向う凹溝(9)を形成してなる請求項1~のいずれかに記載の刈刃交換型刈払機。 The blade-exchangeable brush cutter according to any one of claims 1 to 7 , wherein the cutting blade (6) is accommodated on the upper surface of the disk (3), and a recessed groove (9) extending from the center side of the disk to the outer peripheral side is formed. . デスク(3)の底面に山形に突出しデスク(3)と同心円を形成するリング状のガード部(8)を設けてなる請求項1~のいずれかに記載の刈刃交換型刈払機。 The blade replaceable brush cutter according to any one of claims 1 to 7 , wherein a ring-shaped guard portion (8) projecting in a mountain shape from the bottom surface of the disk (3) and forming a concentric circle with the disk (3) is provided. 保護カバー(13)をデスク(3)を回転可能に軸支するギヤボックス(2)側又はデスク(3)側のいずれかに取付けてなる請求項7~9のいずれかに記載の刈刃交換型刈払機。 A cutting blade replacement according to any one of claims 7 to 9 , wherein the protective cover (13) is attached to either the side of the gear box (2) that rotatably supports the desk (3) or the side of the desk (3). type lawn mower.
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JP3187238U (en) 2013-09-05 2013-11-14 豊 粟野 Nylon cord type brush cutter cutter head

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JPS5281250A (en) * 1975-12-22 1977-07-07 British Shiyugaa Corp Ltd Weed mower
US4199926A (en) * 1978-10-19 1980-04-29 Petty Richard H Grass cutter and mulcher for rotary lawn mower
JPS63267214A (en) * 1987-04-24 1988-11-04 Kazuo Nomura Stretchable mowing edge
JPH0733619Y2 (en) * 1991-11-29 1995-08-02 信一 大宮 Disc type mowing blade

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