JPH0741307Y2 - Rotary blade of brush cutter - Google Patents
Rotary blade of brush cutterInfo
- Publication number
- JPH0741307Y2 JPH0741307Y2 JP1988162353U JP16235388U JPH0741307Y2 JP H0741307 Y2 JPH0741307 Y2 JP H0741307Y2 JP 1988162353 U JP1988162353 U JP 1988162353U JP 16235388 U JP16235388 U JP 16235388U JP H0741307 Y2 JPH0741307 Y2 JP H0741307Y2
- Authority
- JP
- Japan
- Prior art keywords
- blade
- rotary
- blades
- rotary blade
- brush cutter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
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- Harvester Elements (AREA)
Description
【考案の詳細な説明】 [考案の目的] (産業上の利用分野) 本考案は、エンジンの駆動で水平方向に回転し、外周に
設けた刃部によって地上の草等を刈り払うための刈払機
等の刈払装置の回転刃に係るものである。[Detailed Description of the Invention] [Object of the Invention] (Industrial field of application) The present invention is to mow grass and the like on the ground by rotating the blade in the horizontal direction by the drive of an engine and using a blade portion provided on the outer periphery. The present invention relates to a rotary blade of a brush cutter such as a brush cutter.
(従来技術および解決しようとする課題) 従来、この種の刈払装置の回転刃は、第9図に示すごと
く、一枚の平面状の円板の回転刃93の外周に刃部91が設
けられ、回転刃93を高速で回転させてこの刃部93によっ
て地上の草等の刈り払い作業を行なっていたが、回転刃
全体が平面状であったため側方向あるいは斜め方向の荷
重に対して湾曲し易く、切断に必要な強度以上の板厚を
必要としていた。(Prior Art and Problems to be Solved) Conventionally, as shown in FIG. 9, a rotary blade of a brush cutter of this type is provided with a blade portion 91 on the outer circumference of a rotary blade 93 of a single flat disk. Therefore, the rotary blade 93 was rotated at a high speed to mow off grass on the ground with this blade portion 93, but since the rotary blade was flat in its entirety, it was curved with respect to lateral or diagonal loads. It was easy to do, and required a plate thickness greater than the strength required for cutting.
この構成では、回転刃が高速で回転するために、小石等
をはね飛ばして危険であり、また柔らかい草では刈り残
りが生じる欠点があるので、二枚の回転刃を重ね合わせ
て互いに反対方向に回転させることによって回転速度を
遅くしてこの欠点をなくそうとしたものがあるが、回転
刃が平面であったために、湾曲し易く、草が噛み込む欠
点があり、また相対する刃部が浮き上がって切断性が良
好でなかった。また湾曲を防ぐために板厚を厚くする
と、間に草片、塵埃等を噛み込んだとき回転が阻止され
る欠点があった。In this configuration, since the rotary blades rotate at high speed, it is dangerous to bounce off small stones, etc., and there is a drawback that soft grass causes cutting residue.Therefore, two rotary blades are overlapped in opposite directions. There is an attempt to eliminate this drawback by slowing down the rotation speed by rotating the blade to a flat surface, but since the rotary blade is flat, it has the drawback that it is easily bent and grass is bitten. It floated up and the cuttability was not good. Further, if the plate thickness is increased to prevent bending, there is a drawback that rotation is blocked when grass pieces, dust, etc. are caught in between.
[考案の構成] (課題を解決するための手段および作用) 本考案は、上下に重ね合わせて、エンジン13の駆動で互
いに反対方向に往復回動し、円板部の外周に刃部1,3を
備えた対称円板形の回転刃5,7を設け、両回転刃5,7は、
円板部の曲げ剛性を増すため、外縁が前記刃部1,3に近
接し、内縁が中心部を挟持するフランジ部51,27に近接
し、かつ、高さが所定の高さである截頭円錐形の凹部5
7,59を中央に形成してあると共に、強度上許容される限
界の板厚にて形成したものである。[Structure of the Invention] (Means and Actions for Solving the Problem) The present invention is arranged in such a manner that the blades 1, 1 are arranged on the outer periphery of the disc portion by stacking them vertically and reciprocally rotating in the opposite directions by driving the engine 13. Symmetrical disk-shaped rotary blades 5, 7 equipped with 3, both rotary blades 5, 7 are
In order to increase the bending rigidity of the disc portion, the outer edge is close to the blade portions 1 and 3, the inner edge is close to the flange portions 51 and 27 that sandwich the center portion, and the height is a predetermined height. Conical recess 5
In addition to forming 7,59 in the center, it is formed with a plate thickness that is the limit allowable for strength.
これにより、本考案は薄い板材を使用しても回転刃両方
共に全体の剛性が増したものとなり、側方向あるいは斜
方向の荷重に対して湾曲しにくくなり、塵埃、草片等の
噛み込みを排除できるものである。As a result, the present invention increases the overall rigidity of both rotary blades even when a thin plate material is used, making it difficult to bend with respect to lateral or oblique loads, and preventing dust, grass chips, etc. from being caught. It can be eliminated.
(実施例) 以下、図面により本考案の一実施例について詳細な説明
を行なう。すなわち、第1図〜第8図に外周に多数の刃
部1,3を備えた2枚の円形の回転刃5,7は、上下重ね合わ
せて軸受ケース9に軸支され、連結杆11を介して軸受ケ
ース9と連結するエンジン13の駆動により、連結杆11を
貫通する伝動軸15を介して回転駆動される。連結杆11の
途中には、握り部17とハンドル19が設けられ、ハンドル
19には握り部21が固着している。軸受ケース9内にはベ
アリング23,24により回転筒43を介して回転軸25が垂直
方向に軸支され、回転軸25下端のフランジ部27にはねじ
29によって、下方の回転刃7が固着し、このねじ29を覆
ってカバー31が回転軸25の下端に螺着している。回転筒
43の下部には、フランジ部51が一体に形成され、フラン
ジ部51には上方の回転刃5がねじ53によって固着されて
いる。回転刃5,7はそれぞれ外周に刃部1,3が形成され、
外縁56,58は刃部1,3の根元に近接し、内縁はフランジ部
51,27に近接する円形凹部57,59は円錐状に形成され、刃
部1,3は第6図、第7図に示すごとく、水平面より相対
する回転刃の方向に僅かに折り曲げた形状に形成され、
刃部1,3が重ね合った位置では第3図〜第5図に示すご
とく、刃部1,3の弾性に抗して押し拡げられて、刃部1,3
の先端および根元位置で互いに当接するが、あるいは根
元位置で僅かに隙間を生じるよう設けられており、刃部
1,3の刃部側縁部60,62が互いに接触する位置は点状とな
って、回転にともなって根元部から先端に向って刃部側
縁部60,62に沿って移動するものである。そして、本実
施例の回転刃5,7では、円形凹部57,59の形成に伴ない、
強度上許容される限界の板厚、即ち破損を生じない、ぎ
りぎりの薄さの板厚の材料を使用するものである。Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings. That is, two circular rotary blades 5 and 7 having a large number of blade portions 1 and 3 on the outer periphery in FIGS. 1 to 8 are vertically supported and axially supported by the bearing case 9, and the connecting rod 11 is provided. Driven by the engine 13 connected to the bearing case 9 via the drive shaft, it is rotationally driven via the transmission shaft 15 penetrating the connecting rod 11. A grip 17 and a handle 19 are provided in the middle of the connecting rod 11.
The grip 21 is fixed to 19. In the bearing case 9, the rotary shaft 25 is vertically supported by the bearings 23 and 24 via the rotary cylinder 43, and the flange portion 27 at the lower end of the rotary shaft 25 is screwed.
The lower rotary blade 7 is fixed by 29, and the cover 31 is screwed to the lower end of the rotary shaft 25 so as to cover the screw 29. Rotating cylinder
A flange portion 51 is integrally formed on the lower portion of 43, and the upper rotary blade 5 is fixed to the flange portion 51 with a screw 53. The rotary blades 5 and 7 have blade portions 1 and 3 formed on the outer circumference,
The outer edges 56 and 58 are close to the roots of the blades 1 and 3, and the inner edge is the flange
The circular recesses 57 and 59 adjacent to 51 and 27 are formed in a conical shape, and the blade portions 1 and 3 are slightly bent in the direction of the rotary blades facing each other from the horizontal plane as shown in FIGS. 6 and 7. Formed,
At the positions where the blade portions 1 and 3 are overlapped, as shown in FIGS. 3 to 5, the blade portions 1 and 3 are pushed and spread against the elasticity of the blade portions 1 and 3,
The blades come into contact with each other at the tip and the root position of the blade, or are provided with a slight gap at the root position.
The positions where the blade-side edge portions 60 and 62 of the blades 1 and 3 come into contact with each other are point-like, and move along the blade-side edge portions 60 and 62 from the root to the tip with rotation. is there. Then, in the rotary blades 5 and 7 of the present embodiment, with the formation of the circular recesses 57 and 59,
A material is used which has a limit thickness which is allowable in terms of strength, that is, a thickness which is as thin as possible without causing damage.
回転軸25と回転筒43の上部にはそれぞれスプライン61,6
3を介して、揺動アーム65,67が係合している。回転軸25
と平行にクランク軸69がベアリング71によって軸受ケー
ス9に軸支され、クランク軸69に一体に形成された偏心
の円形カム板73,75が対称位置に設けられ、外周にそれ
ぞれ嵌合する連結杆77,79の他端はそれぞれ揺動アーム6
5,67の先端に軸81,83によって枢着されている。クラン
ク軸69の下部には、伝動軸15の先端に係合してベアリン
グ39によって軸受ケース9に軸支されたベベルギヤー41
に係合するベベルギヤー33が係合している。伝動軸15の
動力は、ベベルギヤー41,33を経て円形カム板73,75を回
転させ、揺動アーム65,67を反対方向に揺動させ、刃部
1,3の一〜二歯の範囲に回転刃5,7を反対方向に往復回動
させるものである。On the upper part of the rotary shaft 25 and the rotary cylinder 43, splines 61 and 6 respectively.
Swing arms 65 and 67 are engaged via 3. Rotating shaft 25
A crankshaft 69 is axially supported by the bearing case 9 in parallel with the crankshaft 69, and eccentric circular cam plates 73, 75 integrally formed with the crankshaft 69 are provided at symmetrical positions, and the connecting rods are fitted to the outer circumferences. The other ends of 77 and 79 are swing arm 6 respectively.
It is pivotally attached to the tip of 5,67 by shafts 81,83. A bevel gear 41, which engages with the tip of the transmission shaft 15 and is axially supported by the bearing case 9 by a bearing 39, is provided under the crankshaft 69.
Is engaged with the bevel gear 33. The power of the transmission shaft 15 causes the circular cam plates 73, 75 to rotate via the bevel gears 41, 33, the swing arms 65, 67 to swing in the opposite direction, and the blade portion
The rotary blades (5, 7) are reciprocally rotated in opposite directions within a range of one or two teeth (1, 3).
作業者は、握り部17,21を両手で把持してエンジン9の
駆動で低速で反対方向に往復回動する2枚の回転刃5,7
によって地上の草等の刈り払い作業を行なうものであ
る。The operator grips the grips 17, 21 with both hands, and drives the engine 9 to reciprocally rotate the rotary blades 5 and 7 in opposite directions at low speed.
By this, the work of cutting grass on the ground is performed.
回転刃5,7に斜めあるいは側方向の荷重が加わっても、
凹部57,59によって回転刃5,7全体の剛性が増しているた
め、回転刃5,7が湾曲することがない。Even if a load is applied diagonally or laterally to the rotary blades 5 and 7,
The rigidity of the entire rotary blades 5, 7 is increased by the recesses 57, 59, so that the rotary blades 5, 7 do not curve.
また回転刃5,7はクランク軸69の一回転について一往復
するが、その往復運動の範囲は一〜二歯分であるので円
周速度は大きく低下し、特別な減速機構は必要としな
い。Further, the rotary blades 5 and 7 make one reciprocation for one revolution of the crankshaft 69, but the reciprocating motion range is one to two teeth, so the circumferential speed is greatly reduced, and no special reduction mechanism is required.
[考案の効果] 本考案によれば、重ね合わせた二枚の回転刃を反対方向
に往復回動させることにより、特別な減速機構を設ける
ことなく低速回転で作業を行なうことができ、したがっ
て小石等をはねとばすことなく安全に作業を行なうこと
ができ、かつ柔らかい草でも刈り取ることができるとと
もに、回転刃に凹部を設けることにより、回転刃全体の
剛性を増し、薄い材料でも大きく変形することなく、し
かも薄い材料によって刃部付近のみを弾性的に密接する
ことができ、草片等の噛み込みをなくし、刃部を互いに
押圧、接触せしめることを可能とするもので、切断性能
が向上するものである。[Advantage of the Invention] According to the present invention, by rotating two superposed rotary blades reciprocally in opposite directions, it is possible to perform work at low speed without providing a special reduction mechanism, and thus pebble. You can work safely without splashing, etc., and you can mow even soft grass, and by providing the rotary blade with a recess, the overall rigidity of the rotary blade is increased, and even thin materials can be greatly deformed. In addition, it is possible to elastically closely contact only the blade portion with a thin material, and it is possible to press the blade portions against each other by eliminating the biting of grass pieces etc., improving the cutting performance It is a thing.
なお、第9図は従来例を示すもので、平面状の一枚の回
転刃を高速で回転させるものである。Incidentally, FIG. 9 shows a conventional example, in which one flat rotary blade is rotated at high speed.
すなわち、軸受ケース85にはベアリング87によって回転
軸89が軸支され、外周に刃部91を備えた円形の回転刃93
が、上下の座金95,97によって挟持されている。座金95,
97はスプライン99によって回転軸89に係合し、ナット10
1によって固着されている。回転軸89の上端に一体に形
成されたベベルギヤー103にはベベルギヤー105が係合
し、ベベルギヤー105はベアリング107によって軸支さ
れ、連結杆109を貫通する伝動軸111の先端が螺合してい
る。That is, the bearing case 85 has a rotary shaft 89 supported by a bearing 87, and a circular rotary blade 93 having a blade portion 91 on the outer circumference.
Is sandwiched between the upper and lower washers 95 and 97. Washer95,
97 is engaged with the rotating shaft 89 by the spline 99, and the nut 10
It is fixed by 1. A bevel gear 105 is engaged with a bevel gear 103 integrally formed at the upper end of the rotating shaft 89, the bevel gear 105 is axially supported by a bearing 107, and the tip of a transmission shaft 111 penetrating the connecting rod 109 is screwed.
第1図は本考案に係る回転刃を備えた刈払機の斜視説明
図、第2図は本考案の一実施例の側断面図、第3図は要
部の平面図、第4図は第3図のIV-IV線の側断面図、第
5図は第3図のV−V線の側断面図、第6図は他の状態
における要部の平面図、第7図は第6図のVII-VII線の
側断面図、第8図は同要部の平断面図、第9図は従来例
の側断面図である。 1,3……刃部、5,7……回転刃 27,51……フランジ部 57,59……凹部1 is a perspective explanatory view of a brush cutter having a rotary blade according to the present invention, FIG. 2 is a side sectional view of an embodiment of the present invention, FIG. 3 is a plan view of essential parts, and FIG. 3 is a side sectional view taken along the line IV-IV of FIG. 3, FIG. 5 is a side sectional view taken along the line VV of FIG. 3, FIG. 6 is a plan view of an essential part in another state, and FIG. 7 is FIG. 7 is a side sectional view taken along line VII-VII of FIG. 8, FIG. 8 is a plan sectional view of the same portion, and FIG. 9 is a side sectional view of a conventional example. 1,3 …… Blade part, 5,7 …… Rotating blade 27,51 …… Flange part 57,59 …… Cavity
Claims (1)
互いに反対方向に往復回動し、円板部の外周に刃部1,3
を備えた対称円板形の回転刃5,7を設け、前記両回転刃
5,7は、円板部の曲げ剛性を増すため、外縁が前記刃部
1,3に近接し、内縁が中心部を挟持するフランジ部51,27
に近接し、かつ、高さが所定の高さである截頭円錐形の
凹部57,59を中央に形成してあると共に、強度上許容さ
れる限界の板厚にて形成してあることを特徴とする刈払
装置の回転刃。1. The blades 1, 3 are vertically overlapped with each other and driven by an engine 13 to reciprocally rotate in opposite directions so that the blades 1, 3 are formed on the outer circumference of the disc.
Symmetric disk-shaped rotary blades 5 and 7 equipped with
In Nos. 5 and 7, the outer edge is the blade part to increase the bending rigidity of the disk part.
Flange part 51,27 which is close to 1,3 and whose inner edge holds the center part
And the truncated conical recesses 57 and 59 that are close to the center and have a predetermined height are formed in the center, and that they are formed with a plate thickness that is the maximum allowable strength. The rotary blade of the characteristic brush cutter.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1988162353U JPH0741307Y2 (en) | 1988-12-16 | 1988-12-16 | Rotary blade of brush cutter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1988162353U JPH0741307Y2 (en) | 1988-12-16 | 1988-12-16 | Rotary blade of brush cutter |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH01163921U JPH01163921U (en) | 1989-11-15 |
JPH0741307Y2 true JPH0741307Y2 (en) | 1995-09-27 |
Family
ID=31446100
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1988162353U Expired - Lifetime JPH0741307Y2 (en) | 1988-12-16 | 1988-12-16 | Rotary blade of brush cutter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0741307Y2 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2794507B2 (en) * | 1991-11-14 | 1998-09-10 | 光司 坂田 | Brush cutter |
JP5024681B2 (en) * | 2008-09-10 | 2012-09-12 | ニシガキ工業株式会社 | Handheld brush cutter |
JP5924621B2 (en) * | 2013-09-24 | 2016-05-25 | 重井 晴雄 | A new mower with a function that does not rebound greatly even if the cutting edge comes in contact with a hard foreign object during mowing. |
JP2019054753A (en) * | 2017-09-21 | 2019-04-11 | 株式会社大成モナック | Mower |
US11895946B2 (en) * | 2019-02-19 | 2024-02-13 | Husqvarna Ab | Reciprocating mower unit, system and methods |
CN111201893A (en) * | 2020-01-19 | 2020-05-29 | 陕西科技大学 | Portable cherry picking device |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5722499Y2 (en) * | 1976-11-05 | 1982-05-15 | ||
JPS5932255U (en) * | 1982-08-25 | 1984-02-28 | 古河電気工業株式会社 | Piping structure of solar heat collector |
JPH0221871Y2 (en) * | 1984-09-15 | 1990-06-12 |
-
1988
- 1988-12-16 JP JP1988162353U patent/JPH0741307Y2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH01163921U (en) | 1989-11-15 |
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