JP3166670U

JP3166670U - Mower blade

Info

Publication number: JP3166670U
Application number: JP2010007775U
Authority: JP
Inventors: 忠浩松本
Original assignee: 剣松産業株式会社
Priority date: 2010-11-29
Filing date: 2010-11-29
Publication date: 2011-03-17
Anticipated expiration: 2020-11-29

Abstract

【課題】耐久性と切れ味を向上させた草刈機用刃を提供する。【解決手段】中間部位Ｍが略一定の基本幅寸法Ｗ０を有する平行帯板部２から成ると共に、先端に向かって幅寸法Ｗ１が次第に増加する拡幅帯板部３が平行帯板部２の各端部に連設され、拡幅帯板部３，３の回転方向に向かって前端６と後端７に鋭利な刃先８，８を形成している。【選択図】図１A blade for a mower with improved durability and sharpness is provided. An intermediate portion is composed of a parallel strip plate portion having a substantially constant basic width dimension W0, and a widened strip portion having a width dimension W1 gradually increasing toward the tip is provided in each of the parallel strip plate portions. Sharp cutting edges 8 and 8 are formed at the front end 6 and the rear end 7 in the direction of rotation of the widened band plate portions 3 and 3. [Selection] Figure 1

Description

本考案は、草刈機用刃に関する。 The present invention relates to a blade for a mower.

従来、回転刃を有する自走式の草刈機が広く用いられている（特許文献１参照）。
特許文献１記載の草刈機には、図５に示すように、中間部位の平行帯板４１の両端各々に平行な刃先４８，４８を有する先端刀身部４２，４２を連設したストレートタイプの回転刃４０が使用されていた。 Conventionally, a self-propelled mower having a rotary blade has been widely used (see Patent Document 1).
As shown in FIG. 5, the mower described in Patent Document 1 has a straight type rotary blade in which tip blade portions 42, 42 having blade edges 48, 48 parallel to both ends of the parallel strip 41 at the intermediate portion are connected. 40 was used.

特開平８−３３６３２２号公報JP-A-8-336322

しかし、従来の回転刃４０は、図６に示すように、草刈作業に使用すると、草木を伐採する刃先４８が摩耗して先端刀身部４２の角部がアール状となり、かつ、刃先４８の横断面形状が丸くなってしまって、切れ味が鈍くなり、草木を伐採することができなくなっていた。従来は、上述の切れ味が鈍くなるまでの使用時間が短いという欠点があり、また、切れ味が悪くなった回転刃４０を草刈機から取外して、新しいものに交換する作業は、とても面倒で、しかも、交換頻度が高くなるとコストが嵩むという問題があった。 However, as shown in FIG. 6, when the conventional rotary blade 40 is used for a mowing operation, the cutting edge 48 for cutting the vegetation is worn, the corner portion of the tip blade 42 is rounded, and the cutting edge 48 is crossed. The surface shape was rounded, the sharpness was dull, and it was impossible to cut vegetation. Conventionally, there is a drawback that the use time until the above-mentioned sharpness becomes dull is short, and it is very troublesome to remove the rotating blade 40 whose sharpness has deteriorated from the mower and replace it with a new one. There is a problem that the cost increases as the replacement frequency increases.

そこで、本考案は、切れ味と耐久性を向上させた草刈機用刃を提供することを目的とする。 Then, an object of this invention is to provide the blade for mowers which improved sharpness and durability.

本考案に係る草刈機用刃は、中間部位が略一定の基本幅寸法を有する平行帯板部から成ると共に、先端に向かって幅寸法が次第に増加する拡幅帯板部が平行帯板部の各端部に連設され、拡幅帯板部の前端と後端に鋭利な刃先を形成したものである。 The blade for a mower according to the present invention is composed of a parallel strip having a substantially constant basic width at the intermediate portion, and a widened strip having a width that gradually increases toward the tip. A sharp cutting edge is formed at the front end and the rear end of the widened band plate portion, which is connected to the end portion.

また、拡幅帯板部に形成された刃先相互の成す角度をβとすると、１０°≦β≦３０°に設定したものである。 Further, if the angle between the blade edges formed on the widened band plate portion is β, 10 ° ≦ β ≦ 30 ° is set.

本考案の草刈機用刃によれば、草刈作業への使用によって刃先が摩耗しても先端が丸くなりにくく、所定の幅以上を維持できるため切れ味が劣化しない。また、先端の幅を広くした分、拡幅帯板部の質量が増加し、刃先の回転モーメントが従来よりも大きくなって、（遠心力の働きにより）草や細い木を刈る際に、回転速度が減少することなく、確実に刈ることができ、作業効率が上がり、燃費を向上できる。 According to the blade for a mowing machine of the present invention, even if the cutting edge is worn due to use in a mowing operation, the tip is not easily rounded, and the sharpness is not deteriorated because a predetermined width or more can be maintained. In addition, the width of the widened strip increases as the width of the tip increases, and the rotational moment of the cutting edge becomes larger than before. When cutting grass or thin trees (by the action of centrifugal force), the rotational speed Therefore, it is possible to surely mow without reducing the operating efficiency, and the working efficiency can be improved and the fuel consumption can be improved.

本考案の草刈機用刃の実施の一形態を示した平面図である。It is the top view which showed one Embodiment of the blade for mowers of this invention. 草刈機用刃を示した斜視図である。It is the perspective view which showed the blade for mowers. 草刈機用刃を示した正面図である。It is the front view which showed the blade for mowers. 本考案の草刈機用刃を一定時間使用した後の状態を示した平面図である。It is the top view which showed the state after using the blade for mowers of this invention for a fixed time. 従来の草刈機用回転刃を示した平面図である。It is the top view which showed the conventional rotary blade for mowers. 従来の草刈機用回転刃を一定時間使用した後の状態を示した平面図である。It is the top view which showed the state after using the conventional rotary blade for mowers for a fixed time. 本考案と従来例とを比較説明するための比較図である。It is a comparison figure for comparing and explaining this invention and a prior art example.

以下、実施の形態を示す図面に基づき本考案を詳説する。
図１〜図３は、本考案に係る草刈機用刃の実施の一形態を示したものであり、刃本体１は、中間部位Ｍが略一定の基本幅寸法Ｗ_０を有する平行帯板部２から成ると共に、先端に向かって幅寸法Ｗ_１が次第に増加する拡幅帯板部３が平行帯板部２の各端部に連設されている。拡幅帯板部３，３の前端６と後端７には、鋭利な刃先８，８を形成している。
刃本体１は、金属製で、全長が２００ｍｍ〜５００ｍｍ、平均厚さが２ｍｍ〜５ｍｍに設定され、平行帯板部２の基本幅寸法Ｗ_０が３０ｍｍ〜５０ｍｍに設定されている。刃本体１は、その中間部位Ｍ（平行帯板部２）に、刃本体１全体の重心点Ｇ_０を中心とする貫孔部４が貫設されており、貫孔部４に軸を通して自走式の草刈機（図示省略）に取付けられ、重心点Ｇ_０を同一線上に有する回転軸心Ｌ廻りに回転駆動されて草木を伐採する目的で使用される。刃本体１は、１台の草刈機に、１枚だけ取付けられて使用されることもあれば、複数枚取付けられて複数の軸心上で回転駆動されるものとしても良い。また、刃本体１は、複数枚を同一軸心上に重ね合わせて放射状に固着して使用するも好ましい。また、刃本体１は、貫孔部４近傍に、固定用孔部９，９を有し、固定用孔部９，９にボルトを挿通して草刈機に固着されている。
また、図３に示すように、平行帯板部２は、貫孔部４及び固定用孔部９，９を有する平坦な取付部２Ａと、取付部２Ａから各端部にかけて下降する傾斜部２Ｂ，２Ｂとを、有している。言い換えると、刃本体１に於て、先端側の拡幅帯板部３，３の位置よりも平行帯板部２の取付部２Ａが一段高い位置に配設されている。この構成により、刃本体１を草刈機に取付けて回転させる際、拡幅帯板部３，３の刃先８，８が地面に近い位置で草木を根元から伐採することが可能となる。 Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments.
1 to 3, which shows an embodiment of a mower blade in accordance with the present invention, the blade body 1, parallel band plate portion intermediate part M has a substantially constant base width W ₀ together consist of 2, it is widened band plate portion 3 progressively increasing the width dimension W ₁ toward the distal end is provided continuously to each end of the parallel band plate portion 2. Sharp blade edges 8 and 8 are formed at the front end 6 and the rear end 7 of the widened strip portions 3 and 3, respectively.
The blade body 1 is made of metal, has a total length of 200 mm to 500 mm, an average thickness of 2 mm to 5 mm, and a basic width dimension W ₀ of the parallel strip 2 is set to 30 mm to 50 mm. Blade body 1 is provided at its intermediate portion M (parallel band plate portion 2), and through-hole portion 4 around the center of gravity G ₀ of the entire blade body 1 is formed through the self through the shaft to the through-hole portion 4 attached to Hashishiki the mowing machine (not shown), it is used the center of gravity G ₀ for the purpose of cutting down is driven to rotate by plants to the rotation axis L around with the collinear. The blade body 1 may be used by being attached to a single mower, or may be attached to a plurality of blades and rotationally driven on a plurality of axes. Moreover, it is also preferable that the blade body 1 is used by superimposing a plurality of blades on the same axis and fixing them radially. Further, the blade body 1 has fixing holes 9 and 9 in the vicinity of the through-hole portion 4, and bolts are inserted into the fixing holes 9 and 9 and fixed to the mower.
Further, as shown in FIG. 3, the parallel strip plate portion 2 includes a flat mounting portion 2A having a through hole portion 4 and fixing hole portions 9 and 9, and an inclined portion 2B descending from the mounting portion 2A to each end portion. , 2B. In other words, in the blade body 1, the mounting portion 2 </ b> A of the parallel strip 2 is disposed at a position higher than the position of the wide strips 3, 3 on the tip side. With this configuration, when the blade body 1 is attached to the mower and rotated, the vegetation can be cut from the root at a position where the blade edges 8, 8 of the wide band plates 3, 3 are close to the ground.

刃本体１は、拡幅帯板部３に形成された刃先８，８相互の成す（平面視の）角度をβとすると、１０°≦β≦３０°となるように設定している。拡幅帯板部３，３は、平行帯板部２の両端各々に連設され、先端にゆくに従って幅寸法Ｗ_１が次第に増加する、いわゆる扇形状に形成されている。拡幅帯板部３は、先端角部５が直角よりも鋭い鋭角を成すように形成している。
拡幅帯板部３，３には、草木を切断可能な刃先８，８が、前端６と後端７に両刃状に形成されている。この構成により、回転方向が右回転と左回転の駆動軸を２本有する草刈機に使用する際に、左右の刃本体１，１を交互に入れ替えて使用することが可能である。 The blade body 1 is set so that 10 ° ≦ β ≦ 30 °, where β is an angle (in plan view) between the blade edges 8 and 8 formed on the widened band plate portion 3. Widened band plate portion 3,3 is provided continuously across each parallel band plate portion 2, is increased gradually width W ₁ in accordance Yuku the tip is formed in a so-called fan shape. The widened band plate portion 3 is formed such that the tip corner portion 5 forms an acute angle that is sharper than a right angle.
Blades 8 and 8 capable of cutting vegetation are formed on the widened strips 3 and 3 at the front end 6 and the rear end 7 in a double-edged shape. With this configuration, the left and right blade bodies 1, 1 can be alternately used when used in a mower having two drive shafts whose rotation directions are right rotation and left rotation.

上述した本考案の草刈機用刃の使用方法（作用）について説明する。
まず、草刈機に本考案の草刈機用刃（刃本体１）を取付けて回転駆動させ、草木が茂った路面を走行させる。刃本体１は、刃先８を草木に接触させて根元近くで切断する。この際、刃本体１は、拡幅帯板部３，３の幅寸法Ｗ_１が先端に向かって増加している分、先端側に遠心力が大きく働き、刃先８が草木に接触した場合であっても、その回転速度が減少することなく、力強く草木を刈り取る。 The use method (action) of the above-described mower blade of the present invention will be described.
First, the grass cutter blade (blade body 1) of the present invention is attached to the grass cutter and driven to rotate, and the vehicle runs on a road with grass. The blade body 1 is cut near the root by bringing the blade edge 8 into contact with the plant. At this time, the blade body 1, the partial width dimension W ₁ of the wide band plate portions 3, 3 is increased toward the tip, the centrifugal force acts greatly distally, there when the blade 8 is in contact with the vegetation Even so, the slashing of the vegetation is strong without reducing the rotation speed.

図４と図７（Ａ）に示すように、刃本体１は、一定使用時間草木を刈ると、前端６の刃先８が摩耗し、拡幅帯板部３が、図中２点鎖線で示す使用前状態と比較して、摩滅面積Ｓ_０分だけ摩滅し、その幅寸法Ｗ_１が減少する。他方、従来例の回転刃４０では、図６と図７（Ｂ）に示すように、図中２点鎖線で示す使用前状態から摩滅面積Ｓ_０分だけ摩滅して、その幅寸法Ｗ_２が減少する。
図７（Ａ）に於て、長手方向軸心Ｌ_１と平行な平行帯板部２の前縁延長線Ｌ_３を０°とすれば、上記摩滅が始まっても、十分な使用時間に渡って、摩滅後の前端６Ａは、プラスの傾斜角度を保つ（但し、回転方向Ｒをプラスとする）。即ち、上記十分な使用時間に渡って、図５に示した従来例の回転刃４０の使用前状態の刃先４８よりも、プラスの傾斜角度にあり、その分、図６に示すような先細り形状になるまでの使用時間が延びる。
さらに、詳しく追加説明すれば、図７（Ａ）と図７（Ｂ）とを比較すれば分かるように、同一の（面積Ｓ_０にて示す）摩滅が発生した場合、最先端から所定の小寸法Ｅに於て、長手方向軸心Ｌ_１と平行な直線Ｌ_１´に対する前端６Ａ又は前縁４６が成すマイナス角度の絶対値は、本考案の方が、従来例よりも、小さい。つまり、｜θ_１｜＜｜θ_２｜となる。これによって、切れ味が保たれる使用時間が、本考案では十分に長くなることが分る。
このように、本考案の草刈機用刃（刃本体１）は、図４と図７（Ａ）に示す一定時間使用した後の状態であっても、刃先８を大きく後退させることなく保持し、確実に草木を切断可能な切れ味を有している。つまり、本考案の草刈機用刃は、従来のストレートタイプの回転刃４０（図５、図６及び図７（Ｂ）参照）と比較して、長時間の使用に耐え得る耐久性を有する。 As shown in FIG. 4 and FIG. 7A, when the blade body 1 cuts the vegetation for a certain period of time, the cutting edge 8 of the front end 6 is worn, and the widened strip 3 is used as indicated by a two-dot chain line in the figure Compared with the previous state, it is worn out by the worn area S ₀ minutes, and its width dimension W ₁ decreases. On the other hand, in the conventional example of the rotary blade 40, as shown in FIG. 6 and FIG. 7 (B), the by attrition by abrasion area S ₀ minutes from a state prior to use indicated by the two-dot chain line, its width W ₂ Decrease.
At a FIG 7 (A), if the leading edge extension L ₃ in the longitudinal axis L ₁ and parallel parallel band plate portion 2 and 0 °, even the wear begins, over a sufficient use time Thus, the front end 6A after abrasion maintains a positive inclination angle (however, the rotational direction R is positive). That is, over the sufficient use time, it is at a more positive inclination angle than the cutting edge 48 of the conventional rotary blade 40 shown in FIG. 5 in the state before use, and the tapered shape as shown in FIG. Use time until it becomes.
Further, if more detail additional explanation, as can be seen from the comparison between FIGS. 7 (A) and FIG. 7 (B), (indicated by the area S ₀₎ identical if wear occurs, a predetermined from advanced small In the dimension E, the absolute value of the minus angle formed by the front end 6A or the front edge 46 with respect to the straight line L ₁ ′ parallel to the longitudinal axis L ₁ is smaller in the present invention than in the conventional example. That is, | θ ₁ | <| θ ₂ |. As a result, it can be seen that the use time during which the sharpness is maintained is sufficiently long in the present invention.
As described above, the mower blade (blade body 1) of the present invention holds the blade edge 8 without greatly retreating, even after being used for a certain period of time as shown in FIGS. 4 and 7A. It has a sharpness that can cut the vegetation. That is, the blade for a mower of the present invention has durability that can withstand long-term use as compared with a conventional straight type rotary blade 40 (see FIGS. 5, 6, and 7B).

なお、本考案の草刈機用刃は、上述した実施の形態に限定されるものではなく、要旨を変更しない範囲での設計変更が可能であって、例えば、刃本体１の一部に切欠部を形成することや、整流翼を突設するも良い。また、図示省略するが、拡幅帯板部３は、凹状に弯曲する刃先８，８を有するように、例えるならば、銀杏の葉のような形に、形成するも好ましい。また、刃先８を凹凸波形に形成するも良い。なお、刃本体１は、固定用孔部を省略し、貫孔部４に挿通した軸にナットを螺着して、草刈機に固着するも望ましい。 In addition, the blade for mowers of the present invention is not limited to the above-described embodiment, and the design can be changed without changing the gist. For example, a cutout portion is formed in a part of the blade body 1. Or a rectifying blade may be provided. Although not shown, it is also preferable that the widened strip 3 is formed in the shape of a ginkgo leaf, for example, so as to have the cutting edges 8 and 8 bent in a concave shape. Further, the cutting edge 8 may be formed in a corrugated waveform. The blade body 1 is preferably fixed to the mower by omitting the fixing hole and screwing a nut onto the shaft inserted through the through hole 4.

以上のように、本考案に係る草刈機用刃は、中間部位Ｍが略一定の基本幅寸法Ｗ_０を有する平行帯板部２から成ると共に、先端に向かって幅寸法Ｗ_１が次第に増加する拡幅帯板部３，３が平行帯板部２の各端部に連設され、拡幅帯板部３，３の前端６と後端７に鋭利な刃先８，８を形成したので、草刈作業への使用によって刃先８，８が摩耗しても先端が丸くなりにくく、かつ、前記所定の幅以上を維持できるため切れ味が劣化しない。また、先端の幅を広くした分、遠心力の働きにより草を刈る回転慣性モーメントがアップし、作業効率が上がり、燃費を向上できる。 As described above, for mower blade according to the present invention, together with the intermediate portion M is formed of a parallel band plate portion 2 having a substantially constant base width W _0, gradually increases the width dimension W ₁ toward the distal end The widening strips 3 and 3 are connected to the respective ends of the parallel strips 2 and the sharp cutting edges 8 and 8 are formed at the front and rear ends 6 and 7 of the wide strips 3 and 3, respectively. Even if the cutting edges 8 and 8 are worn by use, the tip is not easily rounded, and the sharpness is not deteriorated because the predetermined width or more can be maintained. In addition, the rotational inertia moment that mows the grass by the action of the centrifugal force is increased by increasing the width of the tip, so that work efficiency is increased and fuel efficiency can be improved.

また、拡幅帯板部３に形成された刃先８，８相互の成す角度をβとすると、１０°≦β≦３０°に設定したので、摩滅後の前端６Ａが成すマイナス角度θ_１を小さめに保持でき、耐用使用時間を従来品と比較して延長することができる。 Further, if the angle between the cutting edges 8 and 8 formed on the widened strip 3 is β, 10 ° ≦ β ≦ 30 ° is set, so the minus angle θ ₁ formed by the front end 6A after abrasion is made smaller. The service life can be extended compared to conventional products.

２平行帯板部
３拡幅帯板部
６前端
７後端
８刃先
Ｍ中間部位
Ｗ_０基本幅寸法
Ｗ_１幅寸法
β 角度 2 Parallel strip plate portion 3 Widened strip plate portion 6 Front end 7 Rear end 8 Cutting edge M Intermediate part W ₀ Basic width dimension W ₁ Width dimension β Angle

Claims

The widened strip portion (3) in which the intermediate portion (M) is composed of the parallel strip portion (2) having a substantially constant basic width dimension (W ₀ ) and the width dimension (W ₁ ) gradually increases toward the tip. Are connected to each end of the parallel strip (2), and sharp edges (8) (8) at the front end (6) and rear end (7) of the wide strip (3) (3). A blade for a mower characterized by the formation of

The blade for a mower according to claim 1, wherein an angle between the cutting edges (8) and (8) formed on the widened strip (3) is set to 10 ° ≦ β ≦ 30 °.