JPH026746Y2 - - Google Patents

Description

【考案の詳細な説明】 ［産業状の利用分野］ 本考案は土手、畦、溝等の雑草、山林の下刈り
や笹刈りを行う刈払機に用いる刈刃であつて、刃
板の周縁部に多数のチツプを接合する刈払機用チ
ツプソーに関するものである。[Detailed description of the invention] [Industrial field of application] The present invention is a cutting blade used in a brush cutter for mowing weeds on banks, ridges, ditches, etc., undergrowth in mountain forests, and mowing bamboo grass. This invention relates to a tip saw for a brush cutter that joins a large number of tips together.

［従来の技術］ 刈払機用の刈刃には工具鋼による刃板Ａの周縁
部に多数の鋸歯状の歯を設けたものがある。刈払
機用の刈刃の切削条件は非常に厳しく、工具鋼の
みにより刃板は摩耗し易く寿命が短かい。この欠
点を補うために、第３図に示すように刃板の周縁
に多数の超硬と通称されるタングステンカーバイ
トなどのチツプＣを等間隔にろう付したものが案
出されている。しかしながら、従来のチツプソー
はチツプが一定方向（回転方向に向けて）配列さ
れるものであつた。[Prior Art] Some cutting blades for brush cutters include a blade plate A made of tool steel with a large number of serrated teeth provided on the peripheral edge thereof. The cutting conditions for brush cutter blades are very strict, and because they are made only of tool steel, the blade plates are prone to wear and have a short lifespan. In order to compensate for this drawback, a blade plate has been devised in which, as shown in FIG. 3, a large number of chips C made of tungsten carbide, commonly known as carbide, are brazed to the periphery of the blade plate at equal intervals. However, in the conventional chip saw, the chips are arranged in a fixed direction (toward the direction of rotation).

［考案が解決しようとする問題点］ 刈払機の刈刃は被切削物を切断するだけでな
く、土や地上にある小石などとチツプの衝突が避
けられず、チツプソーと言えども摩耗やチツピン
グ（欠損）を生じる。そのため、例えば作業の途
中で新しいものと取替えなければならなかつた。[Problems that the invention aims to solve] The cutting blade of a brush cutter not only cuts the object to be cut, but also the chips inevitably collide with the soil or pebbles on the ground, and even with a chipsaw, it can cause wear and chipping ( (defect). Therefore, for example, it was necessary to replace it with a new one during the work.

このような点に鑑み、本考案はチツプの損傷が
少なく、正逆いずれの方向にも切断能力を有する
ものとし、一般に回転方向が一定である刈払機に
用いる場合、刈刃を反転させることによつて再度
良好な切れ味を発揮するものとして使用すること
ができる刈払機用チツプソーを案出したものであ
る。 In view of these points, the present invention has the ability to cut in both forward and reverse directions with less damage to the tips, and when used in a brush cutter whose rotation direction is generally constant, it is possible to reverse the cutting blade. Therefore, we have devised a tipsaw for a brush cutter that can be used again to exhibit good sharpness.

［問題点を解決するための手段］ 円板状の刃板１の周縁に歯形を形成し多数のチ
ツプを接合するに当り、刃板１の回転方向に向け
て突出する切歯２ａを備えたチツプと、これと対
称的に逆方向に向けて突出する切歯２ｂを備えた
チツプとを一対とし、この切刃対２を刃板１の周
縁に等間隔に設ける。[Means for solving the problem] A tooth profile is formed on the periphery of the disc-shaped blade plate 1, and when joining a large number of chips, incisors 2a are provided that protrude in the direction of rotation of the blade plate 1. A chip and a chip having cutting teeth 2b symmetrically projecting in the opposite direction are made into a pair, and the pair of cutting blades 2 are provided at equal intervals on the periphery of the blade plate 1.

切刃対２と２の間には切刃の回転軌跡Ｘより外
方に突出する突出部３を形成するとともに、切刃
２ａと２ｂの間には、切刃の回転軌跡から突出し
ない程度の突部を設け、切刃２ａおよび２ｂの先
方にそれぞれレツト５ａ，５ｂを形成する。 A protruding portion 3 that protrudes outward from the rotation locus X of the cutting blades is formed between the pair of cutting blades 2 and 2, and a protrusion 3 that does not protrude from the rotation locus of the cutting blades is formed between the cutting edges 2a and 2b. A protrusion is provided to form lets 5a and 5b at the front of the cutting edges 2a and 2b, respectively.

［作用］ 刃板１を第２図矢印方向に回転させ刈払に使用
する場合、小石や被切断物である草木は、まず突
出部３に当つて一旦外方に排除される。草木な
ど、一旦外方に押し出された草木などの被切断物
は自らの弾性によつて刃板方向にはね返し、また
刃板自体が平面的に移動するため、被切断物は後
向きである切刃２ｂおよび突部６部分を通過し、
次位の切刃２ａによつて切断される。このとき、
切刃前方の突部６の存在によつて、被切断物は全
体がガレツトの奥に入り込むようなことがなく、
切刃２ａ、少なくともチツプ４の前縁で切断す
る。[Operation] When the blade plate 1 is rotated in the direction of the arrow in FIG. 2 and used for cutting, pebbles and plants to be cut first hit the protrusion 3 and are once removed outward. Objects to be cut such as plants that have been pushed outward will bounce back toward the blade plate due to their own elasticity, and the blade itself moves in a plane, so the object to be cut will be cut by the cutting blade facing backwards. 2b and the protrusion 6,
It is cut by the next cutting edge 2a. At this time,
Due to the presence of the protrusion 6 in front of the cutting blade, the entire object to be cut will not go into the depths of the gullet.
The cutting blade 2a cuts at least at the leading edge of the chip 4.

刃板１を逆回転させた場合、上記場合とは逆に
切刃２ｂによつて刈払が行なわれる。しかしなが
ら、刈払機の場合刃板を逆回転させて使用するよ
うなことがないため、切刃２ａが磨滅してきた場
合は、刃板１を反転させて使用する。刃板を反転
させると実質的に刃板を逆転させたのと同様、刃
板２ｂが切断作用を行う。 When the blade plate 1 is rotated in the opposite direction, grass cutting is performed by the cutting blade 2b, contrary to the above case. However, in the case of a brush cutter, the blade plate is not rotated in the opposite direction when used, so when the cutting blade 2a becomes worn out, the blade plate 1 is used by reversing it. When the blade plate is reversed, the blade plate 2b performs a cutting action in substantially the same way as when the blade plate is reversed.

［実施例］ 以下、本考案の実施例を添付の図面に基づいて
説明する。[Example] Hereinafter, an example of the present invention will be described based on the attached drawings.

刃板１自体は工具鋼もしくはより安位な材質と
し、周縁には刃形を形成してその頂部には斜め後
方に向けてチツプ４をろう付する。チツプ４は刃
先２ａが回転方向に向くものと、刃先２ｂが逆転
方向に向くものとを一対としているが、この切刃
対２は刃板の周縁に、しかも等間隔で例えば10以
上（図示例の場合12）の多数を配置する。そして
各切刃対２と２の間には刃板と一体である突出部
３を必ず配置する。 The blade plate 1 itself is made of tool steel or a cheaper material, a blade shape is formed on the periphery, and a tip 4 is brazed to the top of the blade shape diagonally backward. The tip 4 has a pair of cutting edges 2a facing in the direction of rotation and a pair of cutting edges 2b facing in the direction of rotation, and the pairs of cutting blades 2 are arranged on the periphery of the blade plate and spaced at equal intervals, for example, 10 or more (example shown). 12) Place a large number of cases. A protrusion 3, which is integral with the blade plate, is always disposed between each pair of cutting blades 2.

チツプソーの場合、チツピングと称しろう付さ
れているチツプが欠けたり、特にろう付の背後か
ら衝撃が加えられると脱落し易いものであるが、
本考案の場合回転方向を向かない切刃の直前に必
ず突出部３が位置することになり、チツプの背後
から衝撃が加えられる虞れがない。つまり、切刃
２ａ，２ｂの回転軌跡Ｘから突出する突出部３の
突出寸法は、隣接する切刃を保護するものであ
り、刃板の回転速度、刃数などを勘案して決定す
るとよい。なお、図示実施例では、チツプの基端
部を刃板に埋設するようにろう付しチツプ４を刃
板１に強力に接合させている。 In the case of a chip saw, the soldered chips tend to chip, which is called chipping, or fall off easily, especially if an impact is applied from behind the soldered part.
In the case of the present invention, the protrusion 3 is always located just in front of the cutting blade that does not face the direction of rotation, so there is no risk of impact being applied from behind the chip. In other words, the protrusion dimension of the protrusion 3 that protrudes from the rotation locus X of the cutting blades 2a, 2b is to protect the adjacent cutting blades, and is preferably determined by taking into consideration the rotational speed of the blade plate, the number of blades, etc. In the illustrated embodiment, the tip 4 is strongly joined to the blade plate 1 by brazing so that the proximal end of the tip is embedded in the blade plate.

切刃２ａと２ｂの間に形成する突部６は、その
大きさ、高さを特に限定するものではないが、突
部６の存在によつて切刃の前方に形成されるガレ
ツト５ａ，５ｂが、ガレツトとして好適な形状と
なるようにする。 The size and height of the protrusion 6 formed between the cutting blades 2a and 2b are not particularly limited; The shape of the gullet should be suitable for use as a gullet.

切刃２ａとこれと逆向きの切刃２ｂは図示例の
ように同じ形状で同じ切削機能を有するものと
し、反転することによつて長時間の使用を可能と
することもできるが、切刃２ａと２ｂを形状、切
削機能の異なるものとし、使用場所、被切断物の
種類などによつて反転して使い分けるようにして
もよい。 The cutting blade 2a and the cutting blade 2b facing opposite to this are assumed to have the same shape and the same cutting function as shown in the example shown in the figure, and can be used for a long time by being reversed. 2a and 2b may have different shapes and cutting functions, and may be reversed and used depending on the place of use, the type of object to be cut, etc.

［考案の効果］ 本考案刈払機用チツプソーによれば、正逆いず
れの方向においても使用することができる。この
とき、切断作用を行なわない切刃は常に回転方向
前方にある突出部によつて保護され、チツプの背
部に小石や被切断物が衝突するのを防止すること
ができる。勿論、一旦外方へ排除された小石は草
木のように旧位に帰らないため切断作用を行なう
切刃に対し小石などが衝突することもない。[Effect of the invention] According to the tipsaw for a brush cutter of the present invention, it can be used in either the forward or reverse direction. At this time, the cutting blade that does not perform a cutting action is always protected by the protrusion located forward in the direction of rotation, thereby preventing pebbles or objects to be cut from colliding with the back of the chip. Of course, once the pebbles are pushed outward, they do not return to their previous positions like plants do, so the pebbles do not collide with the cutting blade that performs the cutting action.

更に、本考案によれば、切刃前方の突部の存在
によつて好ましい形状のガレツトが形成され、ガ
レツトの内奥に被切断物が入り込むようなことが
なく、チツプの切削能力を有効に発揮させること
ができる。 Furthermore, according to the present invention, a gullet with a preferable shape is formed due to the presence of the protrusion in front of the cutting blade, and the object to be cut does not enter deep into the gullet, making the cutting ability of the chip effective. It can be demonstrated.

【図面の簡単な説明】[Brief explanation of the drawing]

添付図面の第１図および第２図は本考案刈払機
用チツプソーの実施例を示すもので、第１図は全
体の正面図、第２図は第１図の部分拡大図、第３
図は従来品の一例を示す一部分のみの正面図、で
ある。 １……刃板、２……切刃対、２ａ，２ｂ……切
刃、３……突出部、４……チツプ、５ａ，５ｂ…
…ガレツト、６……突部。 Figures 1 and 2 of the accompanying drawings show an embodiment of the tipsaw for a brush cutter according to the present invention. Figure 1 is an overall front view, Figure 2 is a partially enlarged view of Figure 1, and Figure 3 is a partially enlarged view of Figure 1.
The figure is a partial front view showing an example of a conventional product. DESCRIPTION OF SYMBOLS 1... Blade plate, 2... Cutting blade pair, 2a, 2b... Cutting blade, 3... Projection, 4... Chip, 5a, 5b...
...Garetsu, 6...protrusion.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 円板状の刃板１の周縁部に多数のチツプを接合
する刈払機用チツプソーにおいて、切刃２ａが刃
板の回転方向に向けて突出するチツプと、切刃２
ｂが切刃２ａとは逆方向に向けて突出するチツプ
とを一対の切刃対２とし多数の切刃対を刃板１の
周縁に等間隔に設け、隣接する切刃対２と切刃対
２との間に切刃２ａおよび切刃２ｂの回転軌跡Ｘ
より外方に突出する突出部３を形成するととも
に、切刃２ａと２ｂの間には、切刃の回転軌跡か
ら突出しない程度の突部６を設け、切刃２ａおよ
び２ｂの先方にそれぞれガレツト５ａ，５ｂを形
成してなる刈払機用チツプソー。 In a tipsaw for a brush cutter in which a large number of tips are joined to the peripheral edge of a disc-shaped blade plate 1, a tip with a cutting blade 2a protruding toward the rotation direction of the blade plate, and a cutting blade 2 are used.
A tip b protruding in the opposite direction to the cutting edge 2a is used as a pair of cutting blade pairs 2, and a large number of cutting blade pairs are provided at equal intervals on the periphery of the blade plate 1, and adjacent cutting blade pairs 2 and cutting blades Rotation locus X of cutting blade 2a and cutting blade 2b between pair 2
In addition to forming a protrusion 3 that protrudes further outward, a protrusion 6 that does not protrude from the rotation locus of the cutting blade is provided between the cutting blades 2a and 2b, and a gullet is provided at the tip of the cutting blade 2a and 2b, respectively. A tipsaw for a brush cutter formed with 5a and 5b.