JP4550755B2 - Brush cutter grounding body and brush cutter - Google Patents

Brush cutter grounding body and brush cutter Download PDF

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JP4550755B2
JP4550755B2 JP2006077120A JP2006077120A JP4550755B2 JP 4550755 B2 JP4550755 B2 JP 4550755B2 JP 2006077120 A JP2006077120 A JP 2006077120A JP 2006077120 A JP2006077120 A JP 2006077120A JP 4550755 B2 JP4550755 B2 JP 4550755B2
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brush cutter
grounding body
grounding
main body
mounting plate
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JP2007252213A (en
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清司 北村
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Kitamura Manufacturing Co Ltd
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Kitamura Manufacturing Co Ltd
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Priority to JP2006077120A priority Critical patent/JP4550755B2/en
Application filed by Kitamura Manufacturing Co Ltd filed Critical Kitamura Manufacturing Co Ltd
Priority to PCT/JP2007/054459 priority patent/WO2007108326A1/en
Priority to US12/282,863 priority patent/US7661252B2/en
Priority to AU2007228152A priority patent/AU2007228152B2/en
Priority to KR1020087025451A priority patent/KR101038110B1/en
Priority to ES07737972T priority patent/ES2415757T3/en
Priority to CN2007800096820A priority patent/CN101404869B/en
Priority to EP07737972.5A priority patent/EP1997364B1/en
Priority to TW096108764A priority patent/TWI304323B/en
Publication of JP2007252213A publication Critical patent/JP2007252213A/en
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Description

本発明は、刈払機の刈刃の下面に取り付ける接地体、及び刈払機に関するものである。 The present invention relates to a grounding body attached to a lower surface of a cutting blade of a brush cutter and a brush cutter .

従来から、刈払機２０には、図６のように、水平回転する刈刃２６の下面に接地体１´を取り付け、刈払機２０の使用時の姿勢を安定させて刈払機２０に良好な使用性を備えるようにすることがしばしば行われている（たとえば特許文献１参照）。そして従来、この接地体１´としては、別体の、刈刃２６の下面に当接して刈刃２６を駆動軸２３に固定させる金属製の取付板３´と、下面が地面への接地面となる金属製の本体２´とで構成されていた。上記のように別体の本体２´と取付板３´とで構成された接地体１´にあっては、比較的小部品の構成部材である取付板３´が紛失し易く、使い勝手が悪いという問題があった。また、本体２´は軽量化を期して金属薄板２９のプレス加工によって成形されていたが、金属薄板２９は地面との磨耗により簡単に破断されてしまうのであって、耐久性に劣るという問題があった。
特開平９−１７２８４０号公報 Conventionally, as shown in FIG. 6, the brush cutter 20 has a grounding body 1 ′ attached to the lower surface of the horizontally rotating cutting blade 26 to stabilize the posture when the brush cutter 20 is used, so that the brush cutter 20 can be used well. It is often carried out to have the property (see, for example, Patent Document 1). Conventionally, as this grounding body 1 ′, a separate metal mounting plate 3 ′ that abuts against the lower surface of the cutting blade 26 and fixes the cutting blade 26 to the drive shaft 23, and the lower surface is a grounding surface to the ground. And a metal main body 2 '. As described above, in the grounding body 1 ′ composed of the separate main body 2 ′ and the mounting plate 3 ′, the mounting plate 3 ′, which is a component of a relatively small part, is easily lost and is not easy to use. There was a problem. Further, the main body 2 ′ is formed by pressing the thin metal plate 29 in order to reduce the weight. However, the thin metal plate 29 is easily broken due to abrasion with the ground, and has a problem that it is inferior in durability. there were.
Japanese Patent Laid-Open No. 9-172840

本発明は上記の従来の問題点に鑑みて為したものであって、構成部材の紛失の恐れを無くすると共に、軽量化を確保しつつも良好な耐久性を備えた刈払機の接地体、及び刈払機を提供することを課題とするものである。
The present invention was made in view of the above-described conventional problems, and eliminates the risk of losing components, and also provides a grounding body for a brush cutter with good durability while ensuring weight reduction , It is another object of the present invention to provide a brush cutter .

上記課題を解決するために本発明の請求項１に係る刈払機の接地体は、刈払機の回転刃２６の下面に取り付けられて地面に摺接される接地体１であって、上記接地体１は中空の樹脂製の本体２と該本体２の上部に一体化されて刈払機２０の駆動軸２３に取り付けられる金属製の取付板３とから成り、上記本体２は回転刃２６の下面を覆う被覆部９を有し、この被覆部９の地面に摺接する接地部の中央部分に駆動軸２３の下端部が収容される下方に開口する凹所１１を形成し、凹所１１の下方開口縁部を被覆部９よりも厚肉にした耐磨耗部１７としている。これによると、金属製の取付板３によって接地体１の駆動軸２３への高い取付強度を確保できると共に、この金属製の取付板３と樹脂製の本体２とは一体化されているので、構成部品が紛失するようなこともなくて接地体１に良好な使用性を確保できるのであり、また、中空の本体２を樹脂で製造したことで、接地体１の軽量化を図りつつ、任意箇所の肉厚を自在に形成できる樹脂製の特性を生かして地面に摺接する凹所１１の下方開口縁部に被覆部９よりも厚肉の耐磨耗部１７を設けることができたから、接地体１に高い耐久性を備えることができるのである。また、請求項１に係る刈払機の接地体は、取付板３に穿設した貫通穴８の上部を大径部８ａとすると共に下部を小径部８ｂに形成し、取付板３を本体２にインサート成形で一体化すると共にこのインサート成形時に樹脂を貫通穴８に充填して上記本体２に貫通穴８に嵌合する抜け止め突起１４を形成したことを特徴としている。これによると、樹脂の固化後に貫通穴８に嵌合した抜け止め突起１４は貫通穴８の大径部８ａの充填部分（大径突起部１４ａ）が貫通穴８の小径部８ｂの上方を抑えて取付板３の本体２からの分離を有効に防止できる構造になっており、本体２と取付板３との間に高い接合強度を確保できる。 In order to solve the above-mentioned problem, a grounding body of a brush cutter according to claim 1 of the present invention is a grounding body 1 that is attached to the lower surface of the rotary blade 26 of the brush cutter and is in sliding contact with the ground. 1 includes a hollow resin main body 2 and a metal mounting plate 3 that is integrated with the upper portion of the main body 2 and is attached to the drive shaft 23 of the brush cutter 20. The main body 2 covers the lower surface of the rotary blade 26. A recess 11 is formed in the center portion of the grounding portion that has a covering portion 9 to cover and slides on the ground of the covering portion 9. The lower opening of the drive shaft 23 is accommodated in the lower portion. The wear-resistant part 17 whose edge is thicker than the covering part 9 is used . According to this, the metal mounting plate 3 can secure a high mounting strength of the grounding body 1 to the drive shaft 23, and the metal mounting plate 3 and the resin main body 2 are integrated. It is possible to ensure good usability for the grounding body 1 without losing the components, and the hollow body 2 is made of resin, so that the grounding body 1 can be reduced in weight while being optional. Since the thickness of the resin can be freely formed, the wear-resistant portion 17 thicker than the covering portion 9 can be provided at the lower opening edge of the recess 11 that is in sliding contact with the ground. The body 1 can have high durability. Further, the grounding body of the brush cutter according to claim 1 has an upper portion of the through hole 8 drilled in the mounting plate 3 as a large diameter portion 8 a and a lower portion as a small diameter portion 8 b, and the mounting plate 3 is attached to the main body 2. It is characterized in that it is integrated by insert molding, and at the time of this insert molding, resin is filled into the through-hole 8 to form a retaining protrusion 14 that fits into the through-hole 8 in the main body 2. According to this, the retaining protrusion 14 fitted in the through hole 8 after the resin is solidified is such that the filling portion (large diameter protrusion 14a) of the large diameter portion 8a of the through hole 8 suppresses the upper portion of the small diameter portion 8b of the through hole 8. Thus, separation of the mounting plate 3 from the main body 2 can be effectively prevented, and high bonding strength can be ensured between the main body 2 and the mounting plate 3.

また、請求項２に係る刈払機の接地体は、請求項１において、凹所１１の周壁部１０を耐磨耗部１７と同肉厚に形成したことを特徴とする。これによると、刈払機２０に取り付けた接地体１を地面に接地して使用した際には周壁部１０には刈払機２０の重量が接地部分に向けて負荷されるのであるが、この周壁部１０を耐磨耗部１７と同じ厚肉状の肉厚寸法に形成したので、接地体１に刈払機２０の重量に対する高い耐強度を確保できる。   The grounding body of the brush cutter according to claim 2 is characterized in that, in claim 1, the peripheral wall portion 10 of the recess 11 is formed to have the same thickness as the wear-resistant portion 17. According to this, when the grounding body 1 attached to the brush cutter 20 is used while being grounded to the ground, the peripheral wall portion 10 is loaded with the weight of the brush cutter 20 toward the grounding portion. 10 is formed to have the same thick wall thickness as the wear-resistant portion 17, it is possible to ensure a high strength resistance against the weight of the brush cutter 20 in the grounding body 1.

また、請求項３に係る刈払機は、請求項１又は２に記載の接地体を取り付けたことを特徴としている。 Further, a brush cutter according to claim 3 is characterized in that the grounding body according to claim 1 or 2 is attached.

本発明は、刈払機の接地体の構成部材の紛失の恐れを無くすると共に、接地体の軽量化を有効に図りつつも、刈払機の接地体に良好な耐久性を備えることができる、といった利点を有する。   The present invention eliminates the possibility of losing the components of the grounding body of the brush cutter and can provide the durability of the grounding body of the brush cutter with good durability while effectively reducing the weight of the grounding body. Have advantages.

本発明の実施形態の例の刈払機の接地体１は、図２のように樹脂製で中空の本体２と金属製の取付板３とで構成されている。
取付板３は、図３のように同厚の円盤で形成されており、その中心部には上下に貫通する挿通穴４が穿設され、外縁部には段部５ａによって上方に突出した上段部５が形成されている。上段部５には周方向に所定の間隔で複数の切欠７と貫通穴８が交互に形成されている。切欠７は取付板３の外端縁から切り欠かれて形成されており、貫通穴８はその上部を大径部８ａとすると共に下部を小径部８ｂとするように形成されている。なお、少なくとも取付板３の上面側の段部５ａの端面５ａ１は垂直な端面に形成されている。 The grounding body 1 of the brush cutter according to the embodiment of the present invention includes a resin-made hollow main body 2 and a metal mounting plate 3 as shown in FIG.
As shown in FIG. 3, the mounting plate 3 is formed of a disk having the same thickness, and an insertion hole 4 penetrating vertically is formed in the center of the mounting plate 3, and an upper stage protruding upward by a step part 5a at the outer edge part. Part 5 is formed. A plurality of notches 7 and through-holes 8 are alternately formed in the upper portion 5 at predetermined intervals in the circumferential direction. The notch 7 is formed by notching from the outer edge of the mounting plate 3, and the through hole 8 is formed so that the upper part is a large diameter part 8 a and the lower part is a small diameter part 8 b. The end face 5a 1 of the step portion 5a of at least the upper surface of the mounting plate 3 is formed in the vertical end surface.

成形型に樹脂を充填させて成形される樹脂製の本体２は、図１，２及び４のように、全体として下方に凸形状の中空のお椀形状に形成されており、回転刃２６の下面を覆ってその下面が地面に摺接する接地部となる被覆部９を有すると共に、この被覆部９の接地部の中央部分から立ち上がる周壁部１０で囲まれて上下に開口する凹所１１とを備えている。この被覆部９は、本体２の外方ほど上方に位置する下方に凸の円弧面板状の部位であり、その肉厚は同厚にされている。被覆部９はその外縁部分が周壁部１０の上端位置と同高さ位置に形成されていて本体２の最上位置となっている。また、周壁部１０は、被覆部９の肉厚よりも厚肉にされると共に全体が同厚であって、その上端部に本体２の外側に拡径する拡径部１２が形成されている。この拡径部１２によると凹所１１の上端部に設ける取付板収納部１３を形成している。詳しくは、拡径部１２は、略水平且つ外方に延びる横片部１２ａと、横片部１２ａの外縁部から上方に立ち上がる縦片部１２ｂとで形成されている。横片部１２ａからは後述する上方に突出する抜け止め突起１４が複数形成され、縦片部１２ｂからは後述の内方に突出する廻り止め突起１５が複数形成される。また、被覆部９と周壁部１０との間には周方向に等間隔に補強リブ１６が設けられていて中空の本体２の剛性強度の向上が図られている。ここで、接地体１を刈払機２０に取り付けて使用した際には、後述の駆動軸２３の下端部や螺合手段２４が凹所１１内に収容されることとなり、被覆部９の下面である接地部が地面に摺接することとなる。詳しくは、接地体１の最下端部となる被覆部９の中央部分の接地部が主に地面に摺接する箇所となる。この被覆部９の中央部分の接地部は凹所１１の下方開口縁部であって具体的には周壁部１０の下端部分であるが、この部位は被覆部９の肉厚よりも厚肉にした耐磨耗部１７となっている。なお、詳しくは、上記耐磨耗部１７となる周壁部１０の下端部分は接地体１の外方に向けて曲がる屈曲部１０ａとなっており、つまり耐磨耗部１７では周壁部１０の肉厚である水平方向の樹脂の厚み寸法は勿論のこと上下方向の樹脂の厚み寸法も被覆部９の肉厚に比べて厚さのある寸法に形成されている。   A resin main body 2 formed by filling a molding die with resin is formed into a hollow bowl shape that is convex downward as a whole as shown in FIGS. And a recess portion 11 which is surrounded by a peripheral wall portion 10 rising from a central portion of the grounding portion of the covering portion 9 and opens up and down. ing. The covering portion 9 is a downwardly projecting arcuate plate-like portion located on the upper side toward the outer side of the main body 2, and the thickness thereof is the same. The outer edge portion of the covering portion 9 is formed at the same height as the upper end position of the peripheral wall portion 10 and is the uppermost position of the main body 2. Further, the peripheral wall portion 10 is made thicker than the thickness of the covering portion 9 and is the same thickness as a whole, and an enlarged diameter portion 12 is formed on the upper end portion of the peripheral wall portion 10 so as to be expanded outside the main body 2. . According to the enlarged diameter portion 12, the mounting plate storage portion 13 provided at the upper end portion of the recess 11 is formed. Specifically, the enlarged diameter portion 12 is formed by a horizontal piece portion 12a extending substantially horizontally and outward, and a vertical piece portion 12b rising upward from an outer edge portion of the horizontal piece portion 12a. A plurality of retaining projections 14 projecting upward, which will be described later, are formed from the horizontal piece portion 12a, and a plurality of locking projections 15 projecting inward, which will be described later, are formed from the vertical piece portion 12b. Further, reinforcing ribs 16 are provided at equal intervals in the circumferential direction between the covering portion 9 and the peripheral wall portion 10, so that the rigidity strength of the hollow main body 2 is improved. Here, when the grounding body 1 is attached to the brush cutter 20 and used, a lower end portion of a drive shaft 23 and a screwing means 24 described later are accommodated in the recess 11, and the lower surface of the covering portion 9 is A certain grounding part comes into sliding contact with the ground. Specifically, the grounding portion at the center portion of the covering portion 9 that is the lowermost end portion of the grounding body 1 is a location that mainly comes into sliding contact with the ground. The grounding portion in the central portion of the covering portion 9 is the lower opening edge of the recess 11 and specifically the lower end portion of the peripheral wall portion 10, but this portion is thicker than the thickness of the covering portion 9. The wear-resistant part 17 is formed. Specifically, the lower end portion of the peripheral wall portion 10 that becomes the wear-resistant portion 17 is a bent portion 10a that bends toward the outside of the grounding body 1, that is, the wear-resistant portion 17 has a flesh of the peripheral wall portion 10. The thickness dimension of the resin in the vertical direction as well as the thickness dimension of the resin in the horizontal direction, which is the thickness, is also formed with a thickness that is thicker than the thickness of the covering portion 9.

上述のように樹脂製の本体２は成形型に樹脂を充填して成形されるが、この本体２の成形時には、あらかじめ取付板３を成形型内に配置しておいた上で成形型内に樹脂を充填するのであり、つまりインサート成形によって樹脂製の本体２と取付板３とを一体成形するようにしている。取付板３は凹所１１の上方を閉塞するように取付板収納部１３にその上段部５が取り付けられるのであるが、成形型に充填された樹脂は取付板３の各貫通穴８や各切欠７にまで充填されるのであり、樹脂が固化すると、周壁部１０の横片部１２ａから抜け止め突起１４が貫通穴８に嵌合した状態で各々一体に突出形成されると共に、周壁部１０の縦片部１２ｂから廻り止め突起１５が切欠７に嵌合した状態で各々一体に突出形成されるのである。ここで、抜け止め突起１４は、その根元部分には貫通穴８の小径部８ｂに嵌合する小径突起部１４ｂが形成され、その先端部分には貫通穴８の大径部８ａに嵌合する大径突起部１４ａが形成される。つまり、貫通穴８に嵌合した抜け止め突起１４は、その大径突起部１４ａが小径部８ｂの上方を塞ぐような嵌合構造になっており、取付板３が本体２から分離することを有効に防止している。このように取付板３は、その上段部５が取付板収納部１３に抜け止め突起１４による上方への抜け防止や廻り止め突起１５による廻り防止が施された状態で固着されるインサート成形によって、良好な製造性のもと、本体２に一体化されるのである。なお、本体２に一体化された取付板３の上段部５の上面は、本体２の最上位置よりも上方に位置していて回転刃２６の下面に当接する刃当接面６を構成する。このように本例の接地体１は本体２と取付板３が一体化された一部材で構成される。したがって、従来の接地体１´のように２部材で構成されたものではなくて構成部材の紛失の恐れはなく、良好な使い勝手が確保されている。   As described above, the resin main body 2 is formed by filling a molding die with resin. When the main body 2 is molded, the mounting plate 3 is placed in the molding die in advance and then placed in the molding die. The resin is filled, that is, the resin main body 2 and the mounting plate 3 are integrally formed by insert molding. The upper plate 5 is attached to the mounting plate storage portion 13 so that the mounting plate 3 closes the upper portion of the recess 11, but the resin filled in the molding die is formed in the through holes 8 and the notches in the mounting plate 3. 7 is filled, and when the resin is solidified, the retaining projections 14 are integrally formed to protrude from the lateral piece 12a of the peripheral wall portion 10 in the through hole 8, and the peripheral wall portion 10 The anti-rotation protrusions 15 are integrally formed so as to protrude from the vertical piece 12b in a state of being fitted into the notches 7. Here, the retaining protrusion 14 is formed with a small-diameter protrusion 14b that fits into the small-diameter portion 8b of the through-hole 8 at the root portion, and is fitted into the large-diameter portion 8a of the through-hole 8 at the tip portion. A large-diameter protrusion 14a is formed. That is, the retaining protrusion 14 fitted in the through hole 8 has a fitting structure in which the large-diameter protruding portion 14a closes the upper portion of the small-diameter portion 8b, and the mounting plate 3 is separated from the main body 2. Effectively preventing. In this way, the mounting plate 3 is formed by insert molding in which the upper step portion 5 is fixed to the mounting plate storage portion 13 in a state in which the mounting plate 3 is prevented from being pulled upward by the retaining projection 14 or from being rotated by the locking projection 15. It is integrated into the main body 2 with good manufacturability. The upper surface of the upper portion 5 of the mounting plate 3 integrated with the main body 2 constitutes a blade contact surface 6 that is located above the uppermost position of the main body 2 and contacts the lower surface of the rotary blade 26. As described above, the grounding body 1 of this example is constituted by a single member in which the main body 2 and the mounting plate 3 are integrated. Therefore, it is not composed of two members as in the conventional grounding body 1 ′, and there is no fear of losing the constituent members, and good usability is ensured.

上述のようにして形成した接地体１は図４のように刈払機２０に取り付けて使用される。ここで、刈払機２０は、回転刃２６を装着する草刈部２１と、草刈部２１から斜め上後方に延出したシャフト２２とを有し、図示はしないがシャフト２２の途中にはハンドルが、シャフト２２の上端部にはエンジンがそれぞれ設けられている。シャフト２２内にはエンジンの駆動で回転される回転軸（図示せず）が挿通されていて草刈部２１で伝達機構を介して垂直な駆動軸２３に連結されている。つまり、駆動軸２３はエンジンの駆動によって垂直な軸周りに回転駆動されるようになっている。この駆動軸２３の下端部には回転刃２６が螺合手段２４を介して着脱自在に取付けられるようになっているが、本例の接地体１もこの螺合手段２４を利用して回転刃２６と共に駆動軸２３の下端部に着脱自在に取付けられるようになっている。また、草刈部２１の下面には駆動軸２３に固定されて一体に回転する金属製の刃受け２５が設けられている。なお、駆動軸２３に固定される回転刃２６は、外周に亙って切断刃が設けられた丸鋸刃であって、その中央部には挿通穴２７が穿設されている。刃受け２５にはその中央部分に下方に突出する突部２５ａが形成されており、回転刃２６の挿通穴２７が嵌合可能にされている。
ここで、刈払機２０が採用する螺合手段２４としては、一般に、たとえば草刈部２１の下面よりも下方に突出された駆動軸２３の下端部分の外周にねじを刻設したことで形成された雄ねじ部２４ａと、雄ねじ部２４ａに螺合するナット２４ｂとを有して構成したものや、図示はしないが駆動軸２３の下面に形成したねじ孔、このねじ孔に螺合するボルトで構成したものがある（図５参照）。本例の接地体１はいずれの螺合手段２４でも刈払機２０に取付け可能であるが、図１には前者の螺合手段２４を採用した刈払機２０に接地体１を取付けた例を示している。 The grounding body 1 formed as described above is used by being attached to the brush cutter 20 as shown in FIG. Here, the brush cutter 20 includes a grass cutting portion 21 to which the rotary blade 26 is attached, and a shaft 22 extending obliquely upward and rearward from the grass cutting portion 21, although not shown, a handle is provided in the middle of the shaft 22. An engine is provided at the upper end of the shaft 22. A rotating shaft (not shown) that is rotated by driving of the engine is inserted into the shaft 22, and is connected to a vertical driving shaft 23 by a mowing unit 21 through a transmission mechanism. That is, the drive shaft 23 is rotationally driven around a vertical axis by driving the engine. A rotary blade 26 is detachably attached to the lower end portion of the drive shaft 23 via a screwing means 24. The grounding body 1 of this example also uses the screwing means 24 to use the rotary blade. 26 is detachably attached to the lower end of the drive shaft 23. Further, a metal blade receiver 25 that is fixed to the drive shaft 23 and rotates integrally with the lower surface of the mowing unit 21 is provided. The rotary blade 26 fixed to the drive shaft 23 is a circular saw blade provided with a cutting blade over the outer periphery, and an insertion hole 27 is formed in the center thereof. The blade receiver 25 is formed with a protrusion 25a projecting downward at the center thereof, and the insertion hole 27 of the rotary blade 26 can be fitted therein.
Here, the screwing means 24 employed by the brush cutter 20 is generally formed by, for example, engraving screws on the outer periphery of the lower end portion of the drive shaft 23 that projects downward from the lower surface of the mowing unit 21. It is configured with a male screw portion 24a and a nut 24b that is screwed into the male screw portion 24a, or a screw hole that is not shown, but is formed on the lower surface of the drive shaft 23, and a bolt that is screwed into the screw hole. There is something (see FIG. 5). The grounding body 1 of this example can be attached to the brush cutter 20 by any screwing means 24, but FIG. 1 shows an example in which the grounding body 1 is attached to the brush cutter 20 employing the former screwing means 24. ing.

駆動軸２３への回転刃２６、接地体１の固定は、草刈部２１の下面から突出した駆動軸２３に回転刃２６の挿通穴２７、接地体１の挿通穴４を順に挿通し、その上で駆動軸２３の雄ねじ部２４ａに下方からナット２４ｂを螺合させて上方に締め付けることで行われる。詳しくは、図１のように、回転刃２６はその上面が刃受け２５に当接されると共に、その下面が接地体１の取付板３の刃当接面６に当接され、また、接地体１の取付板３の下面にナット２４ｂが当接されるのであり、つまり、ナット２４ｂの締め付けによって刃受け２５との間に回転刃２６や接地体１の取付板３を挟持し、これにより駆動軸２３に回転刃２６や接地体１が重なるようにして一体に固定されるのである。このとき、刃受け２５の突部２５ａは取付板３における上段部５から段部５ａで一段低くなった部位と刃受け２５との間に締め代を残した状態で収納されるのであって、互いに垂直面状である刃受け２５の突部２５ａの外周端面２５ａ１と段部５ａの端面５ａ１とが略隙間無く対向していることで、回転刃２６や接地体1の取付板３の駆動軸２３への芯出しの伴った装着が可能にされている。また、このときには、駆動軸２３の下端部やナット２４ｂは接地体１の凹所１１内に収納されるようになっている。回転刃２６は略水平面で回転駆動するのであって、使用者のシャフト２２の振り動作も加わって草を撫で切るようにして切断するのであるが、その切断作業時には回転刃２６と一体に回転する接地体１の接地部を地面に滑らせるように摺接させることができるため、良好な作業性で切断作業を行うことができるのである。 The rotary blade 26 and the grounding body 1 are fixed to the drive shaft 23 by inserting the insertion hole 27 of the rotary blade 26 and the insertion hole 4 of the grounding body 1 into the drive shaft 23 protruding from the lower surface of the mowing unit 21 in order. Then, the nut 24b is screwed into the male screw portion 24a of the drive shaft 23 from below and tightened upward. Specifically, as shown in FIG. 1, the upper surface of the rotary blade 26 is in contact with the blade receiver 25, and the lower surface thereof is in contact with the blade contact surface 6 of the mounting plate 3 of the grounding body 1. The nut 24b is brought into contact with the lower surface of the mounting plate 3 of the body 1, that is, the rotary blade 26 and the mounting plate 3 of the grounding body 1 are sandwiched between the blade receiver 25 by tightening the nut 24b, thereby The rotary blade 26 and the grounding body 1 are fixed integrally with the drive shaft 23. At this time, the protrusion 25a of the blade receiver 25 is stored in a state in which a margin is left between the blade receiver 25 and the portion of the mounting plate 3 that is one step lower from the upper step portion 5 to the step portion 5a. by the end face 5a of the outer peripheral end face 25a 1 and the stepped portion 5a of the blade receiving 25 of the projecting portion 25a 1 are mutually perpendicular planar faces without substantially gap, the rotary blade 26 and the grounding member 1 of the mounting plate 3 The drive shaft 23 can be mounted with centering. At this time, the lower end of the drive shaft 23 and the nut 24 b are accommodated in the recess 11 of the grounding body 1. The rotary blade 26 is rotationally driven in a substantially horizontal plane, and is cut by cutting the grass with a scissors by adding a swinging motion of the user's shaft 22, but it rotates integrally with the rotary blade 26 during the cutting operation. Since the grounding portion of the grounding body 1 can be brought into sliding contact with the ground, the cutting operation can be performed with good workability.

上記のように接地体１は切断作業中にその接地部が地面に摺接するのであるから、この接地部は徐々に磨耗していく。殊に、本例の接地体１のように切断作業中に回転刃２６と一体に回転するものは、地面に接触する部位の磨耗は軽視することはできないのであるが、本例の接地体１では上記接地による磨耗にも充分に耐え得る工夫がなされている。つまり、本例の接地体１における地面への主な接地部分は接地体１の最下端部を構成する本体２の周壁部１０の下端部であるが、この部位は地面への接地頻度の低い被覆部９の肉厚よりも厚肉にされた耐磨耗部１７とされている。したがって、本例の接地体１では上記肉厚の比較的厚い耐磨耗部１７で地面に摺接することとなり、接地体１の耐用年数を格段に向上することができたのである。ここで、接地体１に耐磨耗部１７のような特定部位に厚肉部分を形成するのは、耐磨耗部１７を有した本体２が樹脂製であるから容易に行うことができたものである。
また、切断作業時の回転刃２６には切断する草木等から負荷や衝撃がかかるのであり、この負荷や衝撃は回転刃２６の刈払機２０への取付部分へのストレスとなる。しかして、回転刃２６の刈払機２０への取付部分には上記回転刃２６にかかる負荷や衝撃に耐え得るような構造が必要とされる。本例の回転刃２６の刈払機２０への取付構造は叙述のように接地体１の取付板３と刃受け２５との挟持での回転刃２６の固定構造であり、つまり接地体１には取付板３に回転刃２６からの負荷や衝撃がかかるのであるが、取付板３は靭性等の機械的強度に優れた金属製であるためにクラック等の破損の恐れはなく、取付板３の駆動軸２３への取付状態の維持、ひいては回転刃２６の固定維持が確保されている。更に言うと、叙述したように取付板３は本体２に対して抜け止め突起１４による上方への抜け防止や廻り止め突起１５による廻り防止が施された状態で強固に固着されたものであるから、接地体１の本体２と取付板３との固着強度には上記取付板３にかかる負荷や衝撃に対する耐強度も充分に備えられている。 As described above, since the grounding body 1 is in sliding contact with the ground during the cutting operation, the grounding part gradually wears. In particular, the grounding body 1 of this example cannot rotate with the rotating blade 26 integrally during the cutting operation, but the wear of the part in contact with the ground cannot be neglected. Then, the device which can fully endure the abrasion by the said grounding is made | formed. That is, the main grounding portion of the grounding body 1 in this example to the ground is the lower end of the peripheral wall portion 10 of the main body 2 constituting the lowermost end of the grounding body 1, but this part has a low frequency of grounding to the ground. The wear-resistant portion 17 is made thicker than the thickness of the covering portion 9. Therefore, in the grounding body 1 of this example, the relatively thick wear-resistant portion 17 having the above-described thickness is brought into sliding contact with the ground, and the service life of the grounding body 1 can be significantly improved. Here, the thick part can be formed in the specific part such as the wear-resistant portion 17 in the grounding body 1 because the main body 2 having the wear-resistant portion 17 is made of resin. Is.
In addition, a load or impact is applied to the rotary blade 26 during cutting work from a plant or the like to be cut, and this load or impact becomes stress on a portion where the rotary blade 26 is attached to the brush cutter 20. Therefore, the attachment portion of the rotary blade 26 to the brush cutter 20 needs to have a structure that can withstand the load and impact applied to the rotary blade 26. As described above, the mounting structure of the rotary blade 26 to the brush cutter 20 in this example is a fixing structure of the rotary blade 26 between the mounting plate 3 of the grounding body 1 and the blade receiver 25. Although the load and impact from the rotary blade 26 are applied to the mounting plate 3, the mounting plate 3 is made of metal having excellent mechanical strength such as toughness, so there is no risk of damage such as cracks. Maintenance of the attachment state to the drive shaft 23 and, in turn, the fixed maintenance of the rotary blade 26 are ensured. Further, as described above, the mounting plate 3 is firmly fixed to the main body 2 in a state in which the main body 2 is prevented from being pulled upward by the retaining projection 14 and prevented from rotating by the rotation retaining projection 15. In addition, the fixing strength between the main body 2 and the mounting plate 3 of the grounding body 1 is sufficiently provided with a resistance to a load and an impact applied to the mounting plate 3.

このように本例の接地体１は、回転刃２６の固定に係る部位（すなわち取付板３）のみを金属製とし、それ以外の部位である本体２を中空形状で且つ樹脂製としてある。したがって、接地体１の軽量化が有効に図られており、接地体１を取り付けた刈払機２０も軽量にできで扱い易く、つまり刈払機２０の使用性が向上されている。そして、上記のように接地体１の軽量化に資する樹脂製の本体２にあっては、従来の接地体１´のように軽量化を鑑みて金属薄板２９をプレス加工して形成したことで全体で均一な薄い肉厚を備えることになって耐磨耗性が犠牲にされたものではなく、耐磨耗部１７のような特定の部位の肉厚を厚くするといったように肉厚を自在に形成することができたものであり、耐磨耗部１７を設けて接地体１の長寿命化（高い耐久性）を図るべく良好な耐磨耗性を確保することができたのである。なお、接地体１に更に良好な耐磨耗性を備えるべく、本体２を形成する樹脂にたとえばＰＰやナイロン等の機械的強度に優れた樹脂材料を用いることも好ましい。   As described above, in the grounding body 1 of the present example, only the portion related to the fixing of the rotary blade 26 (that is, the mounting plate 3) is made of metal, and the main body 2 which is the other portion is made of a hollow shape and made of resin. Therefore, the weight reduction of the grounding body 1 is effectively achieved, and the brush cutter 20 to which the grounding body 1 is attached can be reduced in weight and is easy to handle, that is, the usability of the brush cutter 20 is improved. And in the resin-made main body 2 contributing to weight reduction of the grounding body 1 as described above, the metal thin plate 29 is formed by pressing in view of weight reduction like the conventional grounding body 1 ′. It is not a sacrificial wear resistance due to the provision of a uniform thin thickness as a whole, but the thickness can be freely increased such that the thickness of a specific part such as the wear resistant portion 17 is increased. Thus, it was possible to ensure good wear resistance in order to extend the life (high durability) of the grounding body 1 by providing the wear-resistant portion 17. In order to provide the grounding body 1 with better wear resistance, it is also preferable to use a resin material having excellent mechanical strength, such as PP or nylon, for the resin forming the main body 2.

更に言うと、本例の接地体１では、樹脂製の本体２の周壁部１０全体を耐磨耗部１７と均一の肉厚に形成している。接地体１を取り付けた刈払機２０の使用状態では接地体１が地面に接地されるのであるが、そのとき刈払機２０の重量は周壁部１０を介して地面に支持されるのであり、つまり周壁部１０は刈払機２０の重量がかかる部位であって強度が必要とされる部位であるが、上記のように周壁部１０全体を耐磨耗部１７と均一の肉厚に形成しているので、刈払機２０の重量に対する耐強度も充分に備えられているのである。   Furthermore, in the grounding body 1 of this example, the entire peripheral wall portion 10 of the resin main body 2 is formed to have a uniform thickness with the wear resistant portion 17. When the brush cutter 20 to which the grounding body 1 is attached is used, the grounding body 1 is grounded to the ground. At this time, the weight of the brush cutter 20 is supported by the ground via the peripheral wall portion 10, that is, the peripheral wall. The portion 10 is a portion where the weight of the brush cutter 20 is applied and requires strength, but the entire peripheral wall portion 10 and the wear-resistant portion 17 are formed to have a uniform thickness as described above. The strength against the weight of the brush cutter 20 is sufficiently provided.

上記のように本例の接地体１によると、金属製の取付板３と樹脂製の本体２が製造性の良いインサート成形で強固に一体化されたことで、回転刃２６からの負荷や衝撃に耐え得る耐強度が確保されると共に、構成部品が紛失するようなこともなくて良好な使用性が確保されたものであり、また、上記強度が必要とされる取付板３のみを金属製としてその他の部位である本体２は中空で且つ樹脂製としたことで、接地体１の軽量化も有効に図られると共に、任意箇所の肉厚を自在に形成できる樹脂製の特性を生かして地面に摺接する部位に肉厚の厚い耐磨耗部１７を設けて接地体１の長寿命化も有効に図られているのである。なお、任意箇所の肉厚を自在に形成できる樹脂製の特性を生かして、たとえば図５のように耐磨耗部１７の肉厚を被覆部９や周壁部１０の肉厚よりも厚みを有するように形成して耐磨耗性を向上させて接地体１の耐用年数の向上を図ってもよいのは言うまでもない。   As described above, according to the grounding body 1 of the present example, the metal mounting plate 3 and the resin body 2 are firmly integrated by insert molding with good manufacturability, so that the load and impact from the rotary blade 26 can be reduced. In addition to ensuring the strength to withstand the above, the component parts are not lost and good usability is ensured, and only the mounting plate 3 that requires the above strength is made of metal. As the other part of the main body 2 is hollow and made of resin, it is possible to effectively reduce the weight of the grounding body 1 and to take advantage of the characteristics of the resin that can freely form the wall thickness of any part. The thick wear-resistant portion 17 is provided at the portion that is in sliding contact with the surface, so that the life of the grounding body 1 is effectively extended. Note that the thickness of the wear-resistant portion 17 is larger than the thickness of the covering portion 9 and the peripheral wall portion 10 as shown in FIG. Needless to say, it is possible to improve the wear life of the grounding body 1 by improving the wear resistance.

本発明の実施の形態の例の接地体を刈払機に取り付けた状態の要部の側断面図である。It is side sectional drawing of the principal part in the state which attached the grounding body of the example of embodiment of this invention to the brush cutter. 同上の接地体であり、（ａ）は上方側から見た斜視図であり、（ｂ）は下方側から見た斜視図である。It is a grounding body same as the above, (a) is a perspective view seen from the upper side, (b) is a perspective view seen from the lower side. 同上の接地体の取付板であり、（ａ）は上面図であり、（ｂ）は（ａ）のＡ−Ａ線断面図である。It is a mounting plate of the grounding body same as the above, (a) is a top view, and (b) is a cross-sectional view taken along line AA of (a). 同上の接地体を刈払機に取り付けた状態の要部の側面図である。It is a side view of the principal part of the state which attached the grounding body same as the above to a brush cutter. 本発明の実施の形態の他例の接地体を刈払機に取り付けた状態の要部の側断面図である。It is a sectional side view of the principal part of the state which attached the grounding body of the other example of embodiment of this invention to the brush cutter. 従来技術の例の接地体を刈払機に取り付けた状態の要部の側断面図である。It is a sectional side view of the principal part of the state which attached the grounding body of the example of the prior art to the brush cutter.

符号の説明Explanation of symbols

１ 接地体
２ 本体
３ 取付板
８ 貫通穴
８ａ 大径部
８ｂ 小径部
９ 被覆部
１０ 周壁部
１１ 凹所
１４ 抜け止め突起
１７ 耐磨耗部 DESCRIPTION OF SYMBOLS 1 Grounding body 2 Main body 3 Mounting plate 8 Through-hole 8a Large diameter part 8b Small diameter part 9 Covering part 10 Perimeter wall part 11 Recess 14 Retaining protrusion 17 Wear-resistant part

Claims (3)

刈払機の回転刃の下面に取り付けられて地面に摺接される接地体であって、上記接地体は、中空の樹脂製の本体と、該本体の上部に一体化されて刈払機の駆動軸に取り付けられる金属製の取付板とから成り、上記本体は、回転刃の下面を覆う被覆部を有し、この被覆部の地面に摺接する接地部の中央部分に駆動軸の下端部が収容される下方に開口する凹所を形成し、凹所の下方開口縁部を被覆部よりも厚肉にした耐磨耗部とし、取付板に穿設した貫通穴の上部を大径部とすると共に下部を小径部に形成し、取付板を本体にインサート成形で一体化すると共にこのインサート成形時に樹脂を貫通穴に充填して上記本体に貫通穴に嵌合する抜け止め突起を形成したことを特徴とする刈払機の接地体。 A grounding body that is attached to the lower surface of the rotary blade of the brush cutter and is in sliding contact with the ground, the grounding body being integrated with a hollow resin main body and an upper portion of the main body, and a driving shaft of the brush cutter The main body has a covering portion that covers the lower surface of the rotary blade, and the lower end portion of the drive shaft is accommodated in the central portion of the grounding portion that is in sliding contact with the ground surface of the covering portion. The lower opening edge of the recess is a wear-resistant part that is thicker than the covering part , and the upper part of the through-hole drilled in the mounting plate is the large-diameter part. The lower part is formed in a small diameter part, and the mounting plate is integrated with the main body by insert molding, and at the time of this insert molding, a resin-filled through hole is formed and a retaining protrusion that fits into the through hole is formed in the main body. The grounding body of the brush cutter. 凹所の周壁部を耐磨耗部と同肉厚に形成したことを特徴とする請求項１記載の刈払機の接地体。 The grounding body of a brush cutter according to claim 1, wherein the peripheral wall portion of the recess is formed to have the same thickness as the wear-resistant portion. 請求項１又は２に記載の接地体を取り付けたことを特徴とする刈払機。3. A brush cutter comprising the grounding body according to claim 1 attached thereto.
JP2006077120A 2006-03-20 2006-03-20 Brush cutter grounding body and brush cutter Active JP4550755B2 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
JP2006077120A JP4550755B2 (en) 2006-03-20 2006-03-20 Brush cutter grounding body and brush cutter
US12/282,863 US7661252B2 (en) 2006-03-20 2007-03-07 Ground surface slide guide of a grass cutter and grass cutter
AU2007228152A AU2007228152B2 (en) 2006-03-20 2007-03-07 Ground surface slide guide of a grass cutter and grass cutter
KR1020087025451A KR101038110B1 (en) 2006-03-20 2007-03-07 Ground surface slide guide of lawn mower and lawn mower
PCT/JP2007/054459 WO2007108326A1 (en) 2006-03-20 2007-03-07 Ground surface slide guide of lawn mower and lawn mower
ES07737972T ES2415757T3 (en) 2006-03-20 2007-03-07 Sliding guide on the ground surface of a grass cutter and grass cutter
CN2007800096820A CN101404869B (en) 2006-03-20 2007-03-07 Ground surface slide guide of lawn mower and lawn mower
EP07737972.5A EP1997364B1 (en) 2006-03-20 2007-03-07 Ground surface slide guide of lawn mower and lawn mower
TW096108764A TWI304323B (en) 2006-03-20 2007-03-14 Ground sliding guide for a grass trimmer and a grass trimmer

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JP2006077120A JP4550755B2 (en) 2006-03-20 2006-03-20 Brush cutter grounding body and brush cutter

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JP2007252213A JP2007252213A (en) 2007-10-04
JP4550755B2 true JP4550755B2 (en) 2010-09-22

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Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102301861A (en) * 2011-06-28 2012-01-04 浙江亚特电器有限公司 Portable complementary unit of grass cutter
KR101170046B1 (en) * 2012-06-07 2012-07-31 임지훈 Shock absorption device of plate for bush cutting machine
CN103535203A (en) * 2013-11-08 2014-01-29 南京林业大学 Circular saw blade and cutter for shrub stumping
JP2017143797A (en) * 2016-02-18 2017-08-24 株式会社北村製作所 Grounding body and bush cutter with the same
JP2018102235A (en) * 2016-12-27 2018-07-05 本田技研工業株式会社 Cutter blade and lawn mower
CN114145124B (en) * 2021-12-16 2022-09-27 江苏共立科技有限公司 Grass mowing head and grass mowing machine with same

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JPH11168956A (en) * 1997-12-12 1999-06-29 Kioritz Corp Portable grass cutter
JP2000106735A (en) * 1998-10-03 2000-04-18 Yoshihiko Fujii Blade for reaper
JP2002136208A (en) * 2000-11-06 2002-05-14 Oppama Kogyo Kk Ground contact disc structure for bush cutter
JP2004141075A (en) * 2002-10-25 2004-05-20 Yoshiyuki Fujii Attachment plate on blade for grass cutter
JP2005333871A (en) * 2004-05-26 2005-12-08 Diatop Kk Protective cover and bush cutter

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11168956A (en) * 1997-12-12 1999-06-29 Kioritz Corp Portable grass cutter
JP2000106735A (en) * 1998-10-03 2000-04-18 Yoshihiko Fujii Blade for reaper
JP2002136208A (en) * 2000-11-06 2002-05-14 Oppama Kogyo Kk Ground contact disc structure for bush cutter
JP2004141075A (en) * 2002-10-25 2004-05-20 Yoshiyuki Fujii Attachment plate on blade for grass cutter
JP2005333871A (en) * 2004-05-26 2005-12-08 Diatop Kk Protective cover and bush cutter

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JP2007252213A (en) 2007-10-04
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