JP3762484B2 - Rotary blade for mower - Google Patents

Rotary blade for mower Download PDF

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Publication number
JP3762484B2
JP3762484B2 JP18812696A JP18812696A JP3762484B2 JP 3762484 B2 JP3762484 B2 JP 3762484B2 JP 18812696 A JP18812696 A JP 18812696A JP 18812696 A JP18812696 A JP 18812696A JP 3762484 B2 JP3762484 B2 JP 3762484B2
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Prior art keywords
rotary blade
mower
blade
cutting
tip
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JPH1014352A (en
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福潮 倉光
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福潮 倉光
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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D34/00—Mowers; Mowing apparatus of harvesters
    • A01D34/01—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
    • A01D34/412—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
    • A01D34/63—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis
    • A01D34/73—Cutting apparatus

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  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Harvester Elements (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、エンジンやモータを駆動源とする草刈機に使用する回転刃に関する。
【０００２】
【従来の技術】
実開昭６３−５５８１３号公報に記載のように、複数の切れ刃を備えた回転刃を、エンジン等によって回転駆動する草刈機が知られている。この草刈機に使用する草刈機用回転刃５０を図３、図４に示すが、全体が平面状となった厚みＴが約１．４ｍｍ程度の硬質の板からなって、周囲に複数の突出片５１を備え、それぞれの突出片５１の回転方向先部に切れ刃５２が形成されている。そして、切れ刃５２が切れなくなった場合には、この草刈機用回転刃５０を裏返して、突出片５１の他方側に形成された切れ刃５３を使用できるようになっているのが一般的である。なお、５４は取付け孔である。
【０００３】
【発明が解決しようとする課題】
しかしながら、前記従来例に係る草刈機用回転刃５０においては、以下のような問題があった。
（１）使用時の切れ刃５２、５３の先端が上を向いて、しかも、切れ刃５２、５３の下側に下向き傾斜面５５を有しているので、草刈機用回転刃５０の回転によって発生する風が相対的に下向きになって、刈ろうとする草を押さえ込み、結果として草への食い込みが悪い。また、地面すれすれに草を刈ることが困難である。
（２）切れ刃５２、５３が潰れてすぐ切れなくなる。
（３）切れ刃５２、５３の切れ味が悪いので、結果として動力消費が大きい。
本発明はかかる事情に鑑みてなされたもので、草への食い込みが良く、しかも動力消費の少ない草刈機用回転刃を提供することを目的とする。
【０００４】
【課題を解決するための手段】
前記目的に沿う請求項１記載の草刈機用回転刃は、周囲に複数の突出片を備え、該突出片の回転方向先部に切れ刃が設けられた草刈機用回転刃において、前記突出片の回転方向先部を斜め下方に向け、しかも、前記切れ刃の刃先は下方傾斜した前記回転方向先部の上表面と該回転方向先部の下向き傾斜面との交線によって形成され、更に、前記突出片の回転方向先部の下表面と前記下向き傾斜面との交線によって接地部が形成されている。ここで、突出片の回転方向先部を斜め下方に向けているとは、突出片の回転方向先部を屈曲させて斜め下方に向ける場合の他、突出片全体を傾斜させて回転方向先部を斜め下方に向ける場合も含む。
請求項２記載の草刈機用回転刃は、請求項１記載の草刈機用回転刃において、前記突出片の回転方向先部は屈曲し、水平面に対して１〜４５度の範囲で傾斜している。
請求項３記載の草刈機用回転刃は、請求項１及び２のいずれか１項に記載の草刈機用回転刃において、前記突出片の切れ刃の基部には切欠きが設けられている。
【０００５】
請求項１〜３記載の草刈機用回転刃は、切れ刃が形成されている突出片の回転方向先部を斜め下方に向けているので、回転によって上昇気流が発生し、刈り込もうとする草を立てようとする。
特に、請求項３記載の草刈機用回転刃においては、突出片の切れ刃の基部には切欠きが設けられているので、この部分に草を誘い込むようにして切ることができる。
【０００６】
【発明の実施の形態】
続いて、添付した図面を参照しつつ、本発明を具体化した実施の形態につき説明し、本発明の理解に供する。
ここに、図１は本発明の一実施の形態に草刈機用回転刃の平面図、図２は図１における矢視Ａ−Ａ断面図である。
【０００７】
図１、図２に示すように、本発明の一実施の形態に係る草刈機用回転刃１０は厚みｔが１．４ｍｍの炭素鋼又は工具鋼等の硬い金属板又は硬質合成樹脂からなって、円板状の本体１１の周囲に複数の突出片１２が設けられている。この突出片１２の両側には切れ刃１３、１４が形成されているが、草刈機用回転刃１０は通常平面的に見て反時計方向、即ち図１の矢印方向に回転させるので、突出片１２の回転方向先部１５に切れ刃１３が形成されている。また、この草刈機用回転刃１０を裏返して使用する場合には、突出片１２の他方側に切れ刃１４が形成されていることになる。
【０００８】
前記切れ刃１３（切れ刃１４も同様）は、突出片１２の回転方向先部１５を斜め傾斜して形成されている。この回転方向先部１５の上表面１６の幅ｗは３〜６ｍｍ程度が好ましく、上表面１６の幅ｗがこの程度であれば、斜め傾斜した回転方向先部１５の傾斜角度θ1 は３〜２５度程度である。なお、傾斜角度θ1 は上表面１６の幅ｗが長ければもっと傾斜角度を小さくでき、上表面１６の幅ｗが短ければ傾斜角度θ1 を大きくとることができ、１〜４５度の範囲で適当に選択することになる。この角度が余り小さければ草刈機用回転刃１０の回転に伴う上昇流が発生しないし、大きければ切れ刃１３が下方に突出して欠け易く、更には危険である。
【０００９】
前記切れ刃１３の刃先１７は、上表面１６と下向き傾斜面１８との交線によって形成され、刃先角度θ2 はこの実施の形態では３５度になっているが、鋭角であれば２０〜５０度の範囲であれば他の角度であってもよい。また、切れ刃１３の刃先１７は鋭利である必要はなく、適当に刃潰しが行われている方が刃こぼれが少なく、取扱いも安全である。
そして、回転方向先部１５の下表面１９と下向き傾斜面１８との交線によって接地部２０が形成されている。この接地部２０の本体１１の裏面に対する高さｈは約０．８〜２ｍｍ程度となっている。この高さｈが余り大きいと切れ刃１３が下方に突出しすぎて危険があり、余り小さいと回転方向先部１５を斜め下方に屈曲させた効果が小さい。
【００１０】
前記切れ刃１３、１４の根元部分、即ち突出片１２の基端部には円弧状の切欠き２１、２２がそれぞれ形成されている。この切欠き２１、２２の深さは回転方向先部１５の幅ｗより少し長い程度、例えば６〜８ｍｍ程度あれば十分である。これによって、刈り込もうとする草をこの切欠き２１、２２に引き込んで切り取ることができると共に、切れ刃１３、１４の境界部分が明確となるので、刃研ぎが行い易い。
前記本体１１の中央には取付け孔２３が形成されて、草刈機本体の回転軸に取付けられるようになっている。
【００１１】
従って、この草刈機用回転刃１０を草刈機本体に取付けして使用すると、回転方向先部１５が下り傾斜しているので、回転によって上昇気流が発生し、これによって、草が上方に引き上げられるようになって、切れ刃１３によって切断される。また、刃元の切欠きが下向きのため、刈ろうとする草を呼びこみキャッチングするので、刈り残しが少ない。そして、切れ刃１３の刃先１７は本体１１の上表面から下方に位置しているので、草に対する噛み付きが良くなる。また、下向き傾斜面１８の角度もより水平に近くなるので、刈り込もうとする草の上を押圧する度合いが減少し、更に刃先１７も草のより下部位置を切断するので、より効率的に刈り込みに寄与する。
実験によれば、同一の草刈機を使用してこの草刈機用回転刃１０を使用すると、従来の草刈機用回転刃に比較してき、動力が約半分で済むという利点があった。
そして、使用によって切れ刃１３が損耗した場合は、草刈機用回転刃１０を裏返せば切れ刃１４を使用して草刈りを行うことができ、この場合、切れ刃１３の使用中には、切れ刃１４は上に向かって傾斜しているので、従来の草刈機用回転刃に比較して切れ刃１４のダメージが少ない。
【００１２】
前記実施の形態は、４個の突出片を有する草刈機用回転刃１０について説明したが、その他の複数の突出片を備えた草刈機用回転刃であってもよいし、更には一方向にのみ切れ刃を有する草刈機用回転刃であっても本発明は適用される。
なお、前記実施の形態においては、突出片の回転方向先部を斜め下方に屈曲して刃先を斜め下方に向けて位置させたが、本体に対して突出片全体を斜め（例えば０．２〜３度あるいはそれ以上）に傾斜させて回転方向先部を斜め下方に向けることもできる。この場合には、突出片は扇風機の羽根のような作用もするので、より大きな風が発生する。
【００１３】
【発明の効果】
請求項１〜３記載の草刈機用回転刃は、切れ刃が形成されている突出片の回転方向先部を斜め下方に屈曲させているので、回転によって上昇気流が発生し、これによって草が立ち、より切り易くなる。
従って、この草刈機用回転刃を使用すると、従来の草刈機用回転刃に比較して回転動力が減少し、省エネとなる。
請求項３記載の草刈機用回転刃においては、突出片の切れ刃の基部には切欠きが設けられているので、この部分に草を誘いこむようにして切ることができると共に、切れ刃を研ぎ易いという利点がある。
【図面の簡単な説明】
【図１】本発明の一実施の形態に係る草刈機用回転刃の平面図である。
【図２】図１における矢視Ａ−Ａ断面図である。
【図３】従来例に係る草刈機用回転刃の平面図である。
【図４】図３における矢視Ｂ−Ｂ断面図である。
【符号の説明】
１０ 草刈機用回転刃 １１ 本体
１２ 突出片 １３ 切れ刃
１４ 切れ刃 １５ 回転方向先部
１６ 上表面 １７ 刃先
１８ 下向き傾斜面 １９ 下表面
２０ 接地部 ２１ 切欠き
２２ 切欠き ２３ 取付け孔[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotary blade used in a mower that uses an engine or a motor as a drive source.
[0002]
[Prior art]
As described in Japanese Utility Model Laid-Open No. 63-55813, a mowing machine is known in which a rotary blade having a plurality of cutting blades is driven to rotate by an engine or the like. A rotary blade 50 for a mower used in this mower is shown in FIGS. 3 and 4. The entire blade is a flat plate having a thickness T of about 1.4 mm, and has a plurality of protrusions around it. A piece 51 is provided, and a cutting edge 52 is formed at the front end in the rotational direction of each protruding piece 51. When the cutting blade 52 cannot be cut, the rotary blade 50 for mower is turned over so that the cutting blade 53 formed on the other side of the protruding piece 51 can be used. is there. Reference numeral 54 denotes a mounting hole.
[0003]
[Problems to be solved by the invention]
However, the rotary blade 50 for mower according to the conventional example has the following problems.
(1) Since the tips of the cutting blades 52 and 53 in use face upward and have a downward inclined surface 55 on the lower side of the cutting blades 52 and 53, the rotation of the rotary blade 50 for the mower The generated wind is relatively downward and the grass to be mowed is held down, resulting in poor biting into the grass. Also, it is difficult to mow the grass on the ground.
(2) The cutting edges 52 and 53 are crushed and cannot be cut immediately.
(3) Since the sharpness of the cutting edges 52 and 53 is poor, the power consumption is large as a result.
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a rotary blade for a mower that has good bite into grass and consumes less power.
[0004]
[Means for Solving the Problems]
The rotary blade for mower according to claim 1, which meets the above-mentioned purpose, includes a plurality of projecting pieces around the projecting piece, and the rotary blade for mowers provided with a cutting blade at a rotational direction front portion of the projecting piece. And the cutting edge of the cutting edge is formed by a line of intersection between the upper surface of the rotational direction tip portion inclined downward and the downward inclined surface of the rotational direction tip portion, A grounding portion is formed by a line of intersection between the lower surface of the tip portion in the rotational direction of the protruding piece and the downward inclined surface. Here, the rotation direction front part of the projecting piece is directed obliquely downward means that the rotation direction front part of the protrusion piece is bent and directed obliquely downward, and the entire protrusion piece is inclined to rotate in the rotation direction front part. This includes the case where is directed diagonally downward.
The rotary blade for a mower according to claim 2 is the rotary blade for a mower according to claim 1, wherein the rotation direction tip portion of the protruding piece is bent and inclined in a range of 1 to 45 degrees with respect to a horizontal plane. Yes.
A rotary blade for a mower according to a third aspect is the rotary blade for a mower according to any one of the first and second aspects, wherein a notch is provided in a base portion of the cutting blade of the protruding piece.
[0005]
Since the rotary blade for mowers according to claims 1 to 3 has the tip in the rotational direction of the projecting piece on which the cutting blade is formed facing obliquely downward, an upward airflow is generated by the rotation, and an attempt is made to trim. Try to stand grass.
In particular, in the rotary blade for a mower according to claim 3 , since the notch is provided in the base of the cutting blade of the protruding piece, it can be cut as if the grass is drawn into this portion.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
FIG. 1 is a plan view of a rotary blade for a mower according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line AA in FIG.
[0007]
As shown in FIGS. 1 and 2, a rotary blade 10 for a mower according to an embodiment of the present invention is made of a hard metal plate or hard synthetic resin such as carbon steel or tool steel having a thickness t of 1.4 mm. A plurality of projecting pieces 12 are provided around the disc-shaped main body 11. Cutting blades 13 and 14 are formed on both sides of the protruding piece 12, but the rotary blade 10 for a mower usually rotates counterclockwise as viewed in a plan view, that is, in the direction of the arrow in FIG. A cutting edge 13 is formed at the front end 15 of the twelve rotational directions. Further, when the rotary blade 10 for mower is turned over and used, the cutting blade 14 is formed on the other side of the protruding piece 12.
[0008]
The cutting edge 13 (same for the cutting edge 14) is formed by inclining the rotational direction tip 15 of the protruding piece 12 obliquely. The width w of the upper surface 16 of the rotational direction tip 15 is preferably about 3 to 6 mm. If the width w of the upper surface 16 is about this level, the tilt angle θ 1 of the rotational direction tip 15 inclined obliquely is 3 to 3. It is about 25 degrees. Note that the inclination angle θ 1 can be made smaller if the width w of the upper surface 16 is longer, and the inclination angle θ 1 can be made larger if the width w of the upper surface 16 is shorter, in the range of 1 to 45 degrees. It will be selected appropriately. If this angle is too small, an upward flow accompanying the rotation of the rotary blade 10 for the mower does not occur, and if it is large, the cutting edge 13 tends to protrude downward and become chipped, which is dangerous.
[0009]
The cutting edge 13 of the cutting edge 13 is formed by a line of intersection between the upper surface 16 and the downward inclined surface 18, and the cutting edge angle θ 2 is 35 degrees in this embodiment. Other angles may be used within the range of degrees. Further, the cutting edge 13 of the cutting edge 13 does not need to be sharp, and blade spilling is less when the blade is properly crushed, and handling is safe.
A grounding portion 20 is formed by a line of intersection between the lower surface 19 of the rotation direction tip portion 15 and the downward inclined surface 18. The height h of the grounding portion 20 with respect to the back surface of the main body 11 is about 0.8 to 2 mm. If the height h is too large, the cutting edge 13 protrudes too much and there is a danger, and if it is too small, the effect of bending the rotational direction tip 15 obliquely downward is small.
[0010]
Arc-shaped cutouts 21 and 22 are formed at the base portions of the cutting edges 13 and 14, that is, at the base end portion of the protruding piece 12, respectively. It is sufficient that the depths of the notches 21 and 22 are slightly longer than the width w of the rotation direction front portion 15, for example, about 6 to 8 mm. As a result, the grass to be trimmed can be pulled into the cutouts 21 and 22 and cut out, and the boundary between the cutting edges 13 and 14 is clarified, so that sharpening is easy.
An attachment hole 23 is formed in the center of the main body 11 so as to be attached to the rotary shaft of the mower main body.
[0011]
Accordingly, when the rotary blade 10 for mower is attached to the mower body and used, the rotational direction tip portion 15 is inclined downward, so that an updraft is generated by the rotation, and thereby the grass is pulled upward. In this way, the cutting blade 13 cuts. Moreover, since the notch at the base of the blade faces downward, the grass to be cut is drawn and caught, so there is little uncut. And since the blade edge | tip 17 of the cutting blade 13 is located below from the upper surface of the main body 11, the biting with respect to a grass becomes good. Further, since the angle of the downward inclined surface 18 becomes closer to the horizontal, the degree of pressing on the grass to be trimmed is reduced, and the cutting edge 17 also cuts the lower position of the grass, so that it is more efficient. Contributes to pruning.
According to the experiment, using the rotary blade 10 for the mower using the same mower has the advantage that the power is about half that of the conventional rotary blade for the mower.
When the cutting edge 13 is worn out by use, the cutting blade 14 can be used for mowing by turning the rotary blade 10 for mowing machine upside down. In this case, while the cutting edge 13 is being used, Since 14 inclines upward, there is little damage of the cutting blade 14 compared with the conventional rotary blade for mowers.
[0012]
Although the said embodiment demonstrated the rotary blade 10 for mowers which has four protrusion pieces, the rotary blade for mowers provided with several other protrusion pieces may be sufficient, and also in one direction. The present invention is applicable even to a rotary blade for a mower having only a cutting edge.
In the above-described embodiment, the front end of the protruding piece in the rotational direction is bent obliquely downward and the blade edge is positioned obliquely downward. It is also possible to tilt the tip in the rotational direction diagonally downward by tilting it by 3 degrees or more. In this case, the protruding piece also acts like a fan blade, so that a larger wind is generated.
[0013]
【The invention's effect】
Since the rotary blade for a mower according to claims 1 to 3 is bent in a diagonally downward direction in the rotational direction of the protruding piece on which the cutting blade is formed, an upward air flow is generated by the rotation, whereby the grass is Standing and cutting easier.
Therefore, when this rotary blade for mowers is used, the rotational power is reduced as compared with the conventional rotary blade for mowers, resulting in energy saving.
In the rotary blade for a mower according to claim 3 , since the notch is provided in the base of the cutting blade of the protruding piece, the cutting blade can be cut so as to attract the grass, and the cutting blade can be easily sharpened. There is an advantage.
[Brief description of the drawings]
FIG. 1 is a plan view of a rotary blade for a mower according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line AA in FIG.
FIG. 3 is a plan view of a rotary blade for a mower according to a conventional example.
4 is a cross-sectional view taken along the line BB in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Rotating blade for mower 11 Main body 12 Projection piece 13 Cutting blade 14 Cutting blade 15 Rotation direction front part 16 Upper surface 17 Cutting edge 18 Downward inclined surface 19 Lower surface 20 Grounding part 21 Notch 22 Notch 23 Mounting hole

Claims (3)

周囲に複数の突出片を備え、該突出片の回転方向先部に切れ刃が設けられた草刈機用回転刃において、
前記突出片の回転方向先部を斜め下方に向け、しかも、前記切れ刃の刃先は下方傾斜した前記回転方向先部の上表面と該回転方向先部の下向き傾斜面との交線によって形成され、更に、前記突出片の回転方向先部の下表面と前記下向き傾斜面との交線によって接地部が形成されることを特徴とする草刈機用回転刃。In the rotary blade for a mower provided with a plurality of projecting pieces around, and provided with a cutting blade at the tip in the rotational direction of the projecting piece,
The tip of the protruding piece is directed obliquely downward, and the cutting edge of the cutting edge is formed by a line of intersection between the upper surface of the tip of the rotation direction inclined downward and the downward inclined surface of the tip of the rotation direction. Further, the rotary blade for a mower is characterized in that a grounding portion is formed by a line of intersection between the lower surface of the tip portion in the rotational direction of the protruding piece and the downward inclined surface. 前記突出片の回転方向先部は屈曲し、水平面に対して１〜４５度の範囲で傾斜している請求項１記載の草刈機用回転刃。  The rotary blade for a mower according to claim 1, wherein a tip portion in the rotation direction of the protruding piece is bent and inclined within a range of 1 to 45 degrees with respect to a horizontal plane. 前記突出片の切れ刃の基部には切欠きが設けられている請求項１及び２のいずれか１項に記載の草刈機用回転刃。The rotary blade for a mower according to any one of claims 1 and 2 , wherein a notch is provided in a base portion of the cutting blade of the protruding piece.
JP18812696A 1996-06-29 1996-06-29 Rotary blade for mower Expired - Fee Related JP3762484B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18812696A JP3762484B2 (en) 1996-06-29 1996-06-29 Rotary blade for mower

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JP18812696A JP3762484B2 (en) 1996-06-29 1996-06-29 Rotary blade for mower

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JPH1014352A JPH1014352A (en) 1998-01-20
JP3762484B2 true JP3762484B2 (en) 2006-04-05

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Cited By (1)

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KR101885613B1 (en) * 2017-04-19 2018-08-06 정태근 Double-sided cutter for lawn trimmer

Families Citing this family (2)

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Publication number Priority date Publication date Assignee Title
JP3558125B2 (en) 2000-10-17 2004-08-25 日本電気株式会社 Wireless communication connection destination identification method
JP2014082974A (en) * 2012-10-23 2014-05-12 Diatop Kk Blade and blade cutter of bush cutter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101885613B1 (en) * 2017-04-19 2018-08-06 정태근 Double-sided cutter for lawn trimmer

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