JP5379755B2

JP5379755B2 - Brush cutter

Info

Publication number: JP5379755B2
Application number: JP2010155143A
Authority: JP
Inventors: 伸幸神原
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-07-07
Filing date: 2010-07-07
Publication date: 2013-12-25
Anticipated expiration: 2030-07-07
Also published as: JP2012016306A

Description

本発明は、雑草等の刈払いに用いる刈払機に関し、特に、刈払機の回転刃の中央部への刈払物の巻込みを防止できる刈払機に関する。 The present invention relates to a brush cutter for use in cutting weeds and the like, and more particularly, to a brush cutter that can prevent the brush cutter from being caught in the central portion of a rotary blade of the brush cutter.

従来、刈払機は、エンジン等の駆動源による駆動力を伝達する部材を内蔵する操作部材の一端にヘッド部材を取付け、このヘッド部材へ中央に回転軸を有する回転刃を回転可能に取付け、操作部材の他端をエンジンに接続し、エンジンによる駆動力により回転刃を高速回転させる構成となっている。この回転刃には、外周に複数の切刃が設けられており、回転刃を高速回転させて左右に揺り動かすことで雑草等の刈払対象物を容易に刈払うことができる。 Conventionally, a brush cutter has a head member attached to one end of an operation member containing a member for transmitting a driving force from a driving source such as an engine, and a rotary blade having a rotation shaft in the center is rotatably attached to the head member for operation. The other end of the member is connected to the engine, and the rotary blade is rotated at high speed by the driving force of the engine. This rotary blade is provided with a plurality of cutting blades on the outer periphery, and an object to be cut off such as weeds can be easily mowed by rotating the rotary blade at high speed and swinging left and right.

また、この刈払機は、操作部材にループハンドル、ツーグリップハンドル又は両手ハンドル等の取っ手を備え、操作部材またはハンドルのグリップにスロットルレバーが設けられる。そして、利用者がハンドルを持って操作部材の上下又は左右の姿勢を調整し、スロットルレバーの操作をすることで、回転刃の回転及び停止を制御できる構成となっている。 In this brush cutter, the operation member includes a handle such as a loop handle, a two-grip handle, or a two-hand handle, and a throttle lever is provided on the grip of the operation member or the handle. The user can control the rotation and stop of the rotary blade by adjusting the vertical or horizontal posture of the operation member with the handle and operating the throttle lever.

このように高速回転する回転刃を有する刈払機に共通する問題として、主に、回転刃にて雑草等を刈り払った際に、この刈払物がヘッド部材、即ち回転刃の中央部に巻込まれて絡まってしまい、回転刃の回転が変動したり停止したりする問題があった。 As a problem common to brush cutters having a rotary blade that rotates at high speed in this way, when the weeds and the like are cut off mainly by the rotary blade, the brushed material is wound around the head member, that is, the central portion of the rotary blade. There is a problem that the rotation of the rotary blade fluctuates or stops.

また、他の問題として、例えば刈払作業中に刈払物対象外のコンクリート等の硬い障害物に誤って回転刃を接触させて破損させてしまったり、回転刃が底面の地面や石等と接触して衝撃や耳障りな接触音を発生してしまったりして、作業性を低下したりする問題があった。また、上述の刈払機は、刈払対象物を刈払う箇所の高さを一定に保ちたい場合に、利用者が地面から回転刃までの高さを常に保持する必要があり、特に刈払対象物が斜面にある場合に利用者に負担となり、長時間の作業が困難となる問題があった。 In addition, as another problem, for example, during cutting work, the rotating blade is accidentally brought into contact with a hard obstacle such as concrete that is not subject to cutting, and the rotating blade may be damaged. There has been a problem in that workability is lowered due to contact and generation of shock and annoying contact sound. In addition, the above-described brush cutter requires that the user always maintain the height from the ground to the rotary blade when the height of the portion to be trimmed is to be kept constant. When an object is on a slope, there is a problem that it becomes a burden on the user and it becomes difficult to work for a long time.

これら問題を解決するために、種々の提案がなされている。例えば、特許文献１には、回転する草刈り刃を先端に備えた草刈り機に取付けられる草寄せ具であり、草刈り刃により切断された切断草を受止めて草刈り機の揺動刈り取り操作に伴って草寄せするようにし、草寄せ具の本体を草刈り刃の上方において横架する棒状体にて形成した寄せ具本体に凸又は凹状の草掛け部を形成した草刈り機が提案されている。 In order to solve these problems, various proposals have been made. For example, Patent Document 1 discloses a grass cutter that is attached to a mowing machine that has a rotating mowing blade at the tip, and receives the cut grass cut by the mowing blade and moves the grass cutter along with the swinging mowing operation of the mowing machine. Thus, there has been proposed a mowing machine in which a main body of a grass cutter is formed of a rod-like body that is horizontally placed above the mowing blade and a convex or concave grass hanging portion is formed.

この発明によれば、草刈り機の草刈り刃によって刈られて飛散される草は草寄せ具にて受止め、切断された草を効率的に一方に寄せることができので、この草寄せ具が障害物となって刈払物の回転刃の中央部への巻込みを防止することができる。 According to the present invention, the grass that is cut and scattered by the mowing blade of the mower can be received by the grass gathering tool, and the cut grass can be efficiently brought to one side. Thus, it is possible to prevent the brushed material from being caught in the central portion of the rotary blade.

また、上述の他の問題を解決するものとして、特許文献２には、外周に刃部を備えた回転刃が回動自在に支持される支持体を、操作部材を介してエンジンに連結して設けた揺動式草刈機において、回転刃の両側面に支持体を地表面に活動自在に保持するためのそり部を設けた揺動式草刈機が提案されている。 In order to solve the other problems described above, Patent Document 2 discloses that a support body on which a rotary blade having a blade portion on its outer periphery is rotatably supported is connected to an engine via an operation member. In the provided oscillating mower, an oscillating mower having a sled portion for actively holding a support on the ground surface on both sides of the rotary blade has been proposed.

この発明によれば、そり部により回転刃の両側面を保護することができ、かつ地面から回転刃までの高さを一定に保持することができるので、利用者への負担を低減することができる。 According to this invention, both sides of the rotary blade can be protected by the sled portion, and the height from the ground to the rotary blade can be kept constant, so the burden on the user can be reduced. it can.

更に、特許文献３には、ハンドルシャフトの先端部に回転駆動される刈払刃が回動自在に設けられた刈払機に用いる刈払機用ガイド部の取付構造であって、刈払刃の下面側にガイド部を取り付け、このガイド部を刈払刃が装着される回転軸に対して軸受を介して相対的に回動自在に設ける刈払機用ガイド部の取付構造を刈払機に適用することが提案されている。 Further, Patent Document 3 discloses a guide structure for a brush cutter used in a brush cutter in which a brush cutter driven to rotate at the tip of a handle shaft is rotatably provided. Applying a mounting structure of a guide unit for a brush cutter that is mounted on a side so that the guide unit can be rotated relative to a rotating shaft on which a brush cutter blade is mounted via a bearing. Has been proposed.

この発明によれば、ガイド部を設けたことにより、草刈作業中に刈払刃が地面や石等との接触による衝撃や耳障りな接触音が発生することを低減することができ、かつ回動自在のガイド部を地面に接触させることによって、利用者が刈払刃を左右に滑らかに揺動させて作業をすることができ、利用者への負担を低減することができる。 According to the present invention, by providing the guide portion, it is possible to reduce the occurrence of an impact or an annoying contact sound caused by the contact between the cutting blade and the ground or stone during mowing work, and rotation. By bringing the flexible guide portion into contact with the ground, the user can work by swinging the brush blade smoothly to the left and right, and the burden on the user can be reduced.

特開２００３−１４３９１９号公報JP 2003-143919 A 実開平０２−１３４８２１号公報Japanese Utility Model Publication No. 02-134821 特開２００８−１８２９６４号公報JP 2008-182964 A

しかしながら、上記の特許文献１の発明では、刈払物の長さがヘッド部材の外周よりも長い場合に、このヘッド部材の外周部即ち回転刃の中央部に刈払物が巻込まれて回転刃の回転が停止する等の不具合が生じる問題が依然としてあった。これにより、巻込まれた刈払物の除去のため作業を一時中止する必要が生じてしまい、作業性が著しく低下してしまう問題があった。また、特許文献１の発明では、雑草等の刈払いの状況に応じて、草寄せ具の着脱を切換える必要があり、これによっても作業性を低下してしまう問題があった。 However, in the above-mentioned patent document 1, when the length of the brush cutter is longer than the outer periphery of the head member, the brush cutter is wound around the outer peripheral portion of the head member, that is, the central portion of the rotary blade. There was still a problem that a malfunction such as stopping of rotation occurred. As a result, it is necessary to temporarily suspend the work for removing the wound brushed material, and there is a problem in that workability is significantly reduced. Further, in the invention of Patent Document 1, it is necessary to switch the attachment and detachment of the weeding tool according to the state of mowing such as weeds, which also causes a problem of reducing workability.

本発明の目的は、刈払機の回転刃の中央部への刈払物の巻込みを容易に防止できる刈払機を提供することにある。 An object of the present invention is to provide a brush cutter that can easily prevent the brush cutter from being caught in the central portion of the rotary blade of the brush cutter.

本発明の目的は、また、回転刃を外部の障害物から保護することができて利用者が地面から回転刃までの高さを容易に一定に保持できる刈払機を提供することにある。 Another object of the present invention is to provide a brush cutter that can protect the rotary blade from an external obstacle and can easily keep the height from the ground to the rotary blade constant.

本発明の刈払機は、操作部材と、該操作部材の一端に設けられるヘッド部材と、該操作部材の他端に設けられる駆動源と、前記ヘッド部材の底部に回転可能に接続される回転刃と、該回転刃の底部側に設けられる回転刃保護部材とから構成され、前記ヘッド部材は前記操作部材を前記回転刃の上部表面に対して所定の仰角を形成して回転刃に接続するように構成され、前記回転刃は前記駆動源による駆動力により回転駆動される刈払機において、前記回転刃の上部表面には該回転刃の外周と同心となり、前記ヘッド部材の底部の外径よりも大きくされた同心円の円上に複数の突起物が前記ヘッド部材に近接して、かつ該上部表面に対して垂直方向に延びるように設けられ、前記突起物とヘッド部材と回転刃の上部表面との間に生成される空間部に、前記操作部材に取付けられ、先端の一方の側面が前記突起物の側面に間隙を置いて配置され、該先端の他方の側面が前記ヘッド部材の底部に間隙を置いて配置され、該先端の底面が前記回転刃の上部表面に間隙を置いて配置される先端部を有する刈払物巻込防止部材が設けられることを特徴している。 The brush cutter according to the present invention includes an operation member, a head member provided at one end of the operation member, a drive source provided at the other end of the operation member, and a rotary blade rotatably connected to the bottom of the head member When, is composed of a rotary blade protection member is found on the bottom side of the rotary blade, wherein the head member is connected to the rotary blade to form a predetermined elevation angle of the operation member with respect to the upper surface of the rotary blade In the brush cutter that is configured to be rotated by the driving force of the driving source, the upper surface of the rotary blade is concentric with the outer periphery of the rotary blade, and the outer diameter of the bottom portion of the head member is A plurality of protrusions are provided on the concentric circle that is enlarged to be close to the head member and extend in a direction perpendicular to the upper surface. The protrusions, the head member, and the upper surface of the rotary blade Space created between Attached to the operating member, one side surface of the tip is disposed with a gap on the side surface of the projection, and the other side surface of the tip is disposed with a gap on the bottom of the head member. In this case, there is provided a brushed material entrainment preventing member having a tip portion whose bottom surface is disposed with a gap on the upper surface of the rotary blade.

本発明の刈払機は、また、前記回転刃の上部表面には該回転刃の外周と同心となり、前記ヘッド部材の底部の外径よりも大きくされた同心円よりも大きくされた同心円の円上に複数の他の突起物が前記突起物に近接して、かつ該上部表面に対して垂直方向に延びるように設けられ、前記突起物と他の突起物と回転刃の上部表面との間に生成される空間部に、前記ヘッド部材に取付けられ、先端の一方の側面が前記突起物の側面に間隙を置いて配置され、該先端の他方の側面が前記他の突起物の側面に間隙を置いて配置され、該先端の底面が前記回転刃の上部表面に間隙を置いて配置される先端部を有する他の刈払物巻込防止部材が設けられることを特徴としている。 In the brush cutter of the present invention, the upper surface of the rotary blade is concentric with the outer periphery of the rotary blade, and is on a concentric circle larger than the concentric circle larger than the outer diameter of the bottom of the head member. A plurality of other protrusions are provided close to the protrusions and extending in a direction perpendicular to the upper surface, and are generated between the protrusions, the other protrusions, and the upper surface of the rotary blade. Is attached to the head member, and one side surface of the tip is disposed with a gap on the side surface of the projection, and the other side surface of the tip is placed on the side surface of the other projection. And an additional anti-wrinkle material entrainment member having a tip portion with the bottom surface of the tip disposed with a gap on the upper surface of the rotary blade.

本発明の刈払機は、また、前記回転刃保護部材の両側には前記操作部材の長手方向に延び、両端が回転刃側に反ったそり部材がそれぞれ複数設けられ、前記回転刃保護部材の両側面に設けられたそり部材のうち外側に設けられた各そり部材間の幅寸法は前記回転刃の外径よりも大きくされ、前記そり部材と前記回転刃との間は所定の高さ間隔が設けられることを特徴としている。 Brush cutter of the present invention, also, the rotation on both sides of the blade protection member extends in the longitudinal direction of the operating member, both ends sled member warped rotary blade side provided with a plurality each of both sides of the rotary blade protection member The width dimension between the sled members provided on the outside of the sled members provided on the surface is larger than the outer diameter of the rotary blade, and a predetermined height interval is provided between the sled member and the rotary blade. It is characterized by being provided.

本発明の刈払機は、上述のように構成しているので、刈払物が回転刃の中央部に巻込むことを容易に防止でき、利用者による作業性の低下を防ぐことができる。また、利用者が地面から回転刃までの高さを容易に一定に保持できるため、利用者による長時間作業による疲労を低減できる。更に、回転刃を外部の障害物から保護することができるため、回転刃の著しい消耗を抑えることができて経済的に用いることができる。 Since the brush cutter of the present invention is configured as described above, it is possible to easily prevent the brush cutter from being wound around the central portion of the rotary blade, and it is possible to prevent the user from deteriorating workability. In addition, since the user can easily maintain a constant height from the ground to the rotary blade, fatigue due to long-time work by the user can be reduced. Furthermore, since the rotary blade can be protected from external obstacles, significant wear of the rotary blade can be suppressed and can be used economically.

本発明の実施例である刈払機の外観を示す概略斜視図。The schematic perspective view which shows the external appearance of the brush cutter which is an Example of this invention. 本発明の実施例である刈払機の縦断面図。The longitudinal cross-sectional view of the brush cutter which is an Example of this invention. 本発明の実施例である刈払機の概略底面図。The schematic bottom view of the brush cutter which is an Example of this invention. 図２の刈払機の概略側面図。The schematic side view of the brush cutter of FIG.

以下、本発明の実施例である刈払機を図面に基づいて説明する。但し、本実施例の刈払機に適用する駆動源の構成および操作部材の詳細構成については、従来構成を用いるものとして図示せずに説明する。 Hereinafter, a brush cutter according to an embodiment of the present invention will be described with reference to the drawings. However, the configuration of the drive source and the detailed configuration of the operation member applied to the brush cutter according to the present embodiment will be described without using a conventional configuration as illustrated.

図１は、本発明の実施例である刈払機１００について、その外観を示す。また、この刈払機１００の縦断面図、側面図、底面図を図２、図３、図４にそれぞれ示す。 FIG. 1 shows the appearance of a brush cutter 100 according to an embodiment of the present invention. Moreover, the longitudinal cross-sectional view of this brush cutter 100, a side view, and a bottom view are shown in FIG.2, FIG.3, FIG.4, respectively.

本発明の実施例における刈払機１００は、図１に示すように、操作部材１と、この操作部材１の一端に設けられるヘッド部材２と、操作部材１の他端に設けられる図示しない駆動源と、ヘッド部材２の底部２Ａに回転可能に接続される回転刃３と、この回転刃３の底部中央部３Ａに接続される回転刃保護部材４とから構成される。 As shown in FIG. 1, the brush cutter 100 in the embodiment of the present invention includes an operation member 1, a head member 2 provided at one end of the operation member 1, and a drive source (not shown) provided at the other end of the operation member 1. And a rotary blade 3 rotatably connected to the bottom 2A of the head member 2 and a rotary blade protection member 4 connected to the bottom center 3A of the rotary blade 3.

また、ヘッド部材２は、操作部材１を回転刃３の上部表面３Ｂに対して所定の仰角５を形成して回転刃３に接続するように構成され、回転刃３は駆動源による駆動力により回転駆動される構成となっている。 The head member 2 is configured to connect the operating member 1 to the rotary blade 3 by forming a predetermined elevation angle 5 with respect to the upper surface 3B of the rotary blade 3, and the rotary blade 3 is driven by a driving force from a driving source. It is configured to be rotationally driven.

更に、回転刃保護部材４には、両端にそり部４Ａを有するそり部材４０が設けられており、これらそり部４Ａの一つは、その一端にそり部４Ａよりも回転刃３側に傾斜した突出部５１が設けられている。そして、この突出部５１の一端とＬ字形状である接続部材５２の一端は結合部５３にて連結されており、更に接続部材５２の他端と操作部材１は結合部５４にて連結される構成となっている。 Further, the rotary blade protection member 4 is provided with a sled member 40 having a sled portion 4A at both ends, and one of the sled portions 4A is inclined at the one end toward the rotary blade 3 rather than the sled portion 4A. A protruding portion 51 is provided. One end of the protruding portion 51 and one end of the L-shaped connecting member 52 are connected by a connecting portion 53, and the other end of the connecting member 52 and the operation member 1 are connected by a connecting portion 54. It has a configuration.

なお、接続部材５２のそり部接続側５２Ａは、操作部材１の中心軸に対して平行に設けられる。これにより、利用者は接続部材５２の地面に対する仰角を目視確認にて調整することにより、そり部材４０の底部４Ｂ即ち接地部４Ｂを支点として回転刃３の地面に対する仰角を調整することができる。即ち、刈払対象物の地面から刈払箇所の高さを適宜調整することができる。 The sled portion connection side 52 A of the connection member 52 is provided in parallel to the central axis of the operation member 1. Thereby, the user can adjust the elevation angle of the rotary blade 3 with respect to the ground with the bottom 4B of the sled member 40, that is, the grounding portion 4B, as a fulcrum by adjusting the elevation angle of the connection member 52 with respect to the ground. That is, it is possible to appropriately adjust the height of the mowing point from the ground of the mowing object.

なお、これら結合部５３、５４には雌ねじ部若しくは貫通穴５３Ａ、５４Ａがそれぞれ設けられており、雄ねじ等の結合部材を結合部５３、５４に螺号若しくは嵌合させることにより各部材１、５１、５２をそれぞれ締付固定するように構成されている。 The coupling portions 53 and 54 are provided with female screw portions or through holes 53A and 54A, respectively, and by connecting or fitting a coupling member such as a male screw to the coupling portions 53 and 54, each member 1, 51, 52 is configured to be fastened and fixed.

上述の刈払機１００の操作部材１と駆動源の構成について、以下詳述する。操作部材１は、棒状に細長い形状をしており、その内部には駆動源からの駆動力を伝えるための駆動伝達軸が設けられて、駆動源から回転刃３へ駆動力を伝達するように構成されている。 The configuration of the operation member 1 and the drive source of the brush cutter 100 described above will be described in detail below. The operation member 1 has a rod-like elongated shape, and a drive transmission shaft for transmitting a driving force from the driving source is provided therein so that the driving force is transmitted from the driving source to the rotary blade 3. It is configured.

また、操作部材１の中央部付近には、利用者が刈払作業時に回転刃３の挙動を操作するためのＵ字状のハンドルが取付けられ、このハンドルの左右両端部にそれぞれ左グリップ、右グリップが装着される。これにより、利用者は両手でハンドルを持って操作部材１を介して容易に回転刃３の上下又は左右の姿勢を調整することができる。 In addition, a U-shaped handle for the user to operate the behavior of the rotary blade 3 during the mowing operation is attached near the center of the operation member 1. A grip is attached. As a result, the user can easily adjust the vertical or horizontal posture of the rotary blade 3 via the operation member 1 while holding the handle with both hands.

また、操作部材１若しくは左右グリップには、後述する駆動源の駆動力を制御できるスロットルレバーが設けられており、このスロットルレバーの操作をすることで駆動力を制御し、回転刃３の回転数を自由に制御できるようになっている。例えば、スロットルレバーの操作により、回転刃３の回転及び停止を容易に切換えることができる。 Further, the operating member 1 or the left and right grips are provided with a throttle lever that can control the driving force of a driving source, which will be described later. The driving force is controlled by operating this throttle lever, and the rotational speed of the rotary blade 3 is controlled. Can be freely controlled. For example, the rotation and stop of the rotary blade 3 can be easily switched by operating the throttle lever.

駆動源としては、操作部材１内に設けられた駆動伝達軸を介して回転刃３を回転駆動するためのクラッチ式内燃エンジンが操作部材１の他端の取付具を介して取り付けられて構成されている。また、このクラッチ式内燃エンジンの燃料としてはガソリンが用いられ、このため内燃エンジンには燃料タンクが付設されている。 The driving source is configured mounted clutch internal combustion engine for rotating the rotary blade 3 via the drive transmission shaft provided in the operating member 1 through a fitting at the other end of the operating member 1 ing. Further, gasoline is used as the fuel of the clutch type internal combustion engine, and for this reason, a fuel tank is attached to the internal combustion engine.

本実施例の刈払機１００の駆動源は、このクラッチ式内燃エンジンが発生する駆動力を駆動伝達軸に伝達することにより回転刃３を回転駆動するようになっている。なお、本実施例の刈払機１００の駆動源は、回転刃３を高速回転駆動でき、上述の駆動源の駆動力を制御できるスロットルレバーにより回転刃３の回転数をある程度制御できるものであれば、別の駆動源を適用できることは言うまでもない。 The driving source of the brush cutter 100 of this embodiment is configured to rotationally drive the rotary blade 3 by transmitting the driving force generated by the clutch type internal combustion engine to the drive transmission shaft. The driving source of the brush cutter 100 according to the present embodiment is capable of driving the rotary blade 3 at a high speed and controlling the rotational speed of the rotary blade 3 to some extent by a throttle lever capable of controlling the driving force of the drive source described above. Needless to say, another drive source can be applied.

次に、ヘッド部材２、回転刃３の構造について、図２を用いて詳述する。ヘッド部材２の内部は中空構造となっており、駆動機構部１０が設けられている。この駆動機構部１０は操作部材１の駆動伝達部と回転刃３間とを接続して回転刃３に駆動力を伝達するように構成されている。 Next, the structure of the head member 2 and the rotary blade 3 will be described in detail with reference to FIG. The inside of the head member 2 has a hollow structure and is provided with a drive mechanism unit 10. The drive mechanism unit 10 is configured to connect a drive transmission unit of the operation member 1 and the rotary blade 3 to transmit a driving force to the rotary blade 3.

また、ヘッド部材２の底部２Ａは、回転刃３の上部表面３Ｂと略接するように設けられる。また、ヘッド部材２は、この外壁２Ｄにより、操作部材１が回転刃３の上部表面３Ｂに対して所定の仰角５を形成するようになっている。この仰角５は、利用者である人間の操作部材１のハンドルを持つ手の平均的高さ位置、利用者から回転刃３までの距離および操作部材１の長さを検討して、利用者が平均的に利用しやすい角度に設定される。 Further, the bottom portion 2 A of the head member 2 is provided so as to be substantially in contact with the upper surface 3 B of the rotary blade 3. The head member 2 is configured such that the operation member 1 forms a predetermined elevation angle 5 with respect to the upper surface 3B of the rotary blade 3 by the outer wall 2D. The elevation angle 5 is determined by examining the average height position of the hand holding the handle of the human operation member 1, the distance from the user to the rotary blade 3, and the length of the operation member 1. An angle that is easy to use on average is set.

以下、図２を用いて駆動機構部１０について詳述する。この駆動機構部１０は、回転軸３０が回転刃３の中央に形成されている挿通孔３Ｄに挿通すると共に、回転刃３が挟持部材３１と押付部材３２及び内側ケース３３の間に狭持されて回転軸３０に固定して取付けられている。 Hereinafter, the drive mechanism unit 10 will be described in detail with reference to FIG. In the drive mechanism 10, the rotary shaft 30 is inserted into an insertion hole 3 D formed in the center of the rotary blade 3, and the rotary blade 3 is sandwiched between the clamping member 31, the pressing member 32, and the inner case 33. And fixedly attached to the rotary shaft 30.

また、回転軸３０には、ヘッド部材２の内部に図示しない回転動力伝達部が設けられており、回転軸３０と操作部材１の駆動伝達部とは回転動力伝達部を介して連結されている。この回転動力伝達部は、例えば複数の傘歯車により構成されており、駆動伝達部による駆動力を回転軸３０の回転力、即ち回転刃３の回転力に変換するように構成されている。 Further, the rotary shaft 30 is provided with a rotary power transmission unit (not shown) inside the head member 2, and the rotary shaft 30 and the drive transmission unit of the operation member 1 are connected via the rotary power transmission unit. . The rotational power transmission unit is constituted by, for example, a plurality of bevel gears, and is configured to convert the driving force by the drive transmission unit into the rotational force of the rotary shaft 30, that is, the rotational force of the rotary blade 3.

また、挟持部材３１は、円板状体であり、例えば中央に形成されている雌ねじ３１Ａが回転軸３０に形成されている雄ねじ３０Ａに螺合することによって回転軸３０と結合されている。内側ケース３３は、下向きの略カップ状体であり、中央に形成されている挿通孔３３Ａに回転軸３０が挿通している。そして、回転軸３０の先端部にはナット３４が螺合されており、このナット３４の締付けによって、内側ケース３３を、押付部材３２を介して回転刃３及び挟持部材３１に押付けて、回転刃３を回転軸３０に固定して取付けている。 The clamping member 31 is a disk-like body, and is coupled to the rotary shaft 30 by, for example, a female screw 31A formed at the center being screwed into a male screw 30A formed on the rotary shaft 30. The inner case 33 is a substantially cup-shaped body facing downward, and the rotating shaft 30 is inserted through an insertion hole 33A formed at the center. A nut 34 is screwed onto the tip of the rotary shaft 30, and by tightening the nut 34, the inner case 33 is pressed against the rotary blade 3 and the sandwiching member 31 via the pressing member 32, thereby rotating the rotary blade. 3 is fixedly attached to the rotary shaft 30.

また、内側ケース３３は、外周面に軸受３５の内周面が装着されており、その内側には、ナット３４が収容されている。軸受３５としては、例えばラジアル玉軸受のような玉軸受が用いられる。また、挟持部材３１の上部の回転軸３０にも同様に玉軸受である軸受３６が装着される。また、押付部材３２および軸受３５の外周面には、係止部材３７、３８が装着されており、押付部材３２および軸受３５は外側に変位しないように係止されている。 Further, the inner case 33 has an inner peripheral surface of the bearing 35 mounted on the outer peripheral surface, and a nut 34 is accommodated on the inner side. As the bearing 35, for example, a ball bearing such as a radial ball bearing is used. Similarly, a bearing 36, which is a ball bearing, is mounted on the rotary shaft 30 above the clamping member 31. Further, locking members 37 and 38 are mounted on the outer peripheral surfaces of the pressing member 32 and the bearing 35, and the pressing member 32 and the bearing 35 are locked so as not to be displaced outward.

以上により駆動機構部１０が構成されており、回転刃３は、駆動機構部１０の回転軸３０により、挟持部材３１、押付部材３２、内側ケース３３およびナット３４を介して回動自在に構成される。即ち、回転刃３は、駆動機構部１０を介してヘッド部材２の底部２Ａに回動自在に接続されることとなる。 The drive mechanism unit 10 is configured as described above, and the rotary blade 3 is configured to be rotatable by the rotating shaft 30 of the drive mechanism unit 10 via the clamping member 31, the pressing member 32, the inner case 33, and the nut 34. The That is, the rotary blade 3 is rotatably connected to the bottom 2 A of the head member 2 via the drive mechanism unit 10.

本実施例の刈払機１００に用いる回転刃３は、金属製の円板であり、この円板の外周３Ｃに沿って複数の凸部３Ｅと凹部３Ｆとが交互に形成され、凸部３Ｆには刃３Ｇが形成されている。このような回転刃３は、上記の刃３Ｇを超硬チップへ代えて用いてもよい。 The rotary blade 3 used in the brush cutter 100 of the present embodiment is a metal disc, and a plurality of convex portions 3E and concave portions 3F are alternately formed along the outer periphery 3C of the disc, and the convex portions 3F are formed on the convex portions 3F. The blade 3G is formed. Such a rotary blade 3 may be used by replacing the blade 3G with a carbide tip.

本実施例の刈払機１００に用いる回転刃保護部材４は、図３に示すように、上述の係止部材３８の外周面に保護部材底部４Ｃが嵌合されて固定されて構成されている。また、保護部材底部４Ｃは、嵌合穴４１、縦突出部４２、横突出部４３および円筒部４４が設けられている。また、嵌合穴４１が上述の係止部材３８の外周面３８Ａに嵌合接続されて構成される。更に、係止部材３８の底部には、嵌合穴４１の内周面に嵌合するようにして係止蓋３９がねじ締め等によって取付固定される。 As shown in FIG. 3, the rotary blade protection member 4 used in the brush cutter 100 according to the present embodiment is configured such that the protection member bottom portion 4 C is fitted and fixed to the outer peripheral surface of the locking member 38. The protective member bottom 4C is provided with a fitting hole 41, a vertical protrusion 42, a horizontal protrusion 43, and a cylindrical part 44. Further, the fitting hole 41 is configured to be fitted and connected to the outer peripheral surface 38A of the locking member 38 described above. Further, the locking lid 39 is fixedly attached to the bottom of the locking member 38 by screwing or the like so as to be fitted to the inner peripheral surface of the fitting hole 41.

また、回転刃保護部材４は、保護部材底部４Ｃの両側の円筒部４４の外周近傍であり、横突出部４３の底部にそれぞれ内側そり部材４５がそれぞれ設けられる。また、このそり部材４５の両端には、回転刃３側に反ったそり部４Ａがそれぞれ設けられている。また更に、横突出部４２の端部、即ち内側そり部材４５の外側にはそれぞれそり部材４０が設けられる。このそり部材４０の両端には、上記のそり部材４５同様に回転刃３側に反ったそり部４Ａがそれぞれ設けられている。なお、そり部４Ａの一つは、上述の通り突出部５１が設けられている。 Further, the rotary blade protection member 4 is in the vicinity of the outer periphery of the cylindrical portion 44 on both sides of the protection member bottom portion 4 C, and inner sled members 45 are respectively provided on the bottom portions of the lateral protrusions 43. Further, at both ends of the sled member 45, a sled portion 4A warped toward the rotary blade 3 is provided. Furthermore, a sled member 40 is provided at each end of the lateral protrusion 42, that is, outside the inner sled member 45. At both ends of the sled member 40, similarly to the sled member 45 described above, sled portions 4A that warp toward the rotary blade 3 are provided. One of the sled portions 4A is provided with the protruding portion 51 as described above.

また、これら縦突出部４２、そり部材４０、４５は、操作部材１の長手方向に延びるようにそれぞれ設けられる。これは、利用者が操作部材１の押出方向即ち操作部材１の長手方向に滑らかに移動させるためである。 Further, the vertical protrusion 42 and the sled members 40 and 45 are provided so as to extend in the longitudinal direction of the operation member 1. This is because the user smoothly moves the operation member 1 in the pushing direction, that is, the longitudinal direction of the operation member 1.

更に、そり部材４０、４５には、図２に示すように、回転刃３と所定の高さ間隔６を置いて設けられる。また、回転刃保護部材４の両端に設けられた外側のそり部４Ａは、それぞれ両端の幅寸法７が回転刃の外周３Ｃよりも大きくなるように設けられる。 Further, as shown in FIG. 2, the sled members 40 and 45 are provided at a predetermined height interval 6 from the rotary blade 3. Further, the outer sled portions 4A provided at both ends of the rotary blade protection member 4 are provided such that the width dimension 7 at each end is larger than the outer periphery 3C of the rotary blade.

本実施例の刈払機１００は、更に、図４に示すように、回転刃３の上部表面３Ｂにはこの回転刃３の外周３Ｃと同心となり、ヘッド部材２の底部２Ａの外径２Ｃよりも大きくされた同心円１３の円上に複数の突起物１１がヘッド部材２に近接して、かつこの上部表面３Ｂに対して垂直方向に延びるように設けられている。 Further, as shown in FIG. 4, the brush cutter 100 of the present embodiment is concentric with the outer surface 3 C of the rotary blade 3 on the upper surface 3 B of the rotary blade 3 and is larger than the outer diameter 2 C of the bottom 2 A of the head member 2. A plurality of protrusions 11 are provided on the enlarged concentric circle 13 so as to be close to the head member 2 and extend in a direction perpendicular to the upper surface 3B.

また、操作部材１に刈払物巻込防止部材２１が取付けられる。この刈払物巻込防止部材２１は、突起物１１とヘッド部材２と回転刃３の上部表面３Ｂとの間に生成される空間部１６に配置される。また、この刈払物巻込防止部材２１の先端部２１Ａは、先端の一方の側面２１Ｂが突起物１１の側面１１Ａに間隙を置いて配置され、上記先端の他方の側面２１Ｃがヘッド部材２の底部２Ａに間隙を置いて配置され、上記先端の底面２１Ｄが回転刃３の上部表面３Ｂに間隙を置いて配置されるように構成されている。 Further, the brushed material entrainment preventing member 21 is attached to the operation member 1. The brushed material entrainment preventing member 21 is disposed in the space 16 generated between the projection 11, the head member 2, and the upper surface 3 B of the rotary blade 3. Further, the front end portion 21A of the brushed material entrainment preventing member 21 is arranged such that one side surface 21B of the front end is spaced from the side surface 11A of the projection 11 and the other side surface 21C of the front end is the head member 2. The bottom 2A is arranged with a gap, and the bottom 21D of the tip is arranged with a gap on the upper surface 3B of the rotary blade 3.

本実施例の刈払機１００は、好ましい構成として、回転刃３の上部表面３Ｂには回転刃３の外周３Ｃと同心となり、上記の同心円１３よりも大きくされた同心円１４の円上に複数の他の突起物１２が突起物１１に近接して、かつ上部表面３Ｂに対して垂直方向に延びるように設けられている。 In a preferred configuration, the brush cutter 100 according to the present embodiment is preferably configured such that the upper surface 3B of the rotary blade 3 is concentric with the outer periphery 3C of the rotary blade 3 and is arranged on a circle of the concentric circle 14 larger than the concentric circle 13 described above. The protrusions 12 are provided so as to extend close to the protrusions 11 and in a direction perpendicular to the upper surface 3B.

また、ヘッド部材２に刈払物巻込防止部材２２が取付けられる。この刈払物巻込防止部材２２は、突起物１１と他の突起物１２と回転刃３の上部表面３Ｂとの間に生成される空間部１７に配置される。また、この刈払物巻込防止部材２２の先端部２２Ａは、先端の一方の側面２２Ｂが突起物１１の側面１１Ｂに間隙を置いて配置され、上記先端の他方の側面２２Ｃが他の突起物１２の側面１２Ａに間隙を置いて配置され、上記先端の底面２２Ｄが回転刃３の上部表面３Ｂに間隙を置いて配置されるように構成されている。以下、突起物１１、１２および刈払物巻込防止部材２１、２２について詳述する。 Further, the brushed material entrainment preventing member 22 is attached to the head member 2. The brushed material entrainment preventing member 22 is disposed in the space 17 generated between the protrusion 11, the other protrusion 12, and the upper surface 3 B of the rotary blade 3. Further, the distal end portion 22A of the brushed material entrainment preventing member 22 is arranged such that one side surface 22B of the distal end is spaced from the side surface 11B of the projection 11, and the other side surface 22C of the distal end is the other projection. Twelve side surfaces 12 A are arranged with a gap, and the bottom surface 22 D of the tip is arranged with a gap on the upper surface 3 B of the rotary blade 3. Hereinafter, the protrusions 11 and 12 and the brushed material entrainment preventing members 21 and 22 will be described in detail.

本実施例の刈払機１００に用いる回転刃３の突起物１１、１２としては、皿部１１Ｃ、１２Ｃと突起部１１Ｄ、１２Ｄを有するリベットピン等の鋲がそれぞれ用いられ、回転刃３の下部表面３Ｈから装着し、回転刃３の上部表面３Ｂに対して突起部１１Ｄ、１２Ｄがそれぞれ垂直方向に延びるように設けられる。このため、回転刃３には、図２に示すように、これら突起部１１Ｄ、１２Ｄを下部表面３Ｈから上部表面３Ｂへ貫通させるための貫通孔３Ｊが設けられている。これら突起物１１、１２は、回転刃３から外れないように貫通孔３Ｊにかしめて固定される。 As the protrusions 11 and 12 of the rotary blade 3 used in the brush cutter 100 of the present embodiment, scissors such as rivet pins having dish portions 11C and 12C and protrusion portions 11D and 12D are used, respectively, and the lower surface of the rotary blade 3 is used. Mounted from 3H, the protrusions 11D and 12D are provided so as to extend in the vertical direction with respect to the upper surface 3B of the rotary blade 3, respectively. For this reason, as shown in FIG. 2, the rotary blade 3 is provided with a through-hole 3J for allowing the protrusions 11D and 12D to penetrate from the lower surface 3H to the upper surface 3B. These protrusions 11 and 12 are caulked and fixed to the through hole 3J so as not to be detached from the rotary blade 3.

また、上述の突起物１１は、この突起物１１の中心軸が図３に示される同心円１３の円上に配置されるようにして複数個設けられている。この同心円１３は、回転刃３の外周３Ｃと同心の円であり、ヘッド部材２の底部２Ａの外径２Ｃよりも大きくされる。また、上述の突起物１２も突起物１１同様に、突起物１２の中心軸が図４に示される同心円１４の円上に配置されるようにして複数個設けられている。この同心円１４は、同心円１３同様に回転刃３の外周３Ｃと同心の円であり、上記の同心円１３よりも大きくされる。 Further, a plurality of the protrusions 11 are provided in such a manner that the central axis of the protrusion 11 is arranged on a concentric circle 13 shown in FIG. The concentric circle 13 is a concentric circle with the outer periphery 3C of the rotary blade 3, and is larger than the outer diameter 2C of the bottom 2A of the head member 2. Further, like the protrusion 11, a plurality of the protrusions 12 described above are provided so that the central axis of the protrusion 12 is arranged on a concentric circle 14 shown in FIG. 4. The concentric circle 14 is a circle concentric with the outer periphery 3C of the rotary blade 3 like the concentric circle 13, and is larger than the concentric circle 13 described above.

より具体的には、突起物１１、１２は、同心円１３の中心角９０度毎に４つずつ設ける。また、これら突起物１１、１２の設けられる位置は、相互に中心角４５度の相違がある。即ち、回転刃３の上部表面３Ｂには、中心角４５度毎に突起物１１、１２のいずれかが設けられている。 More specifically, four protrusions 11 and 12 are provided for every 90 degrees of the central angle of the concentric circle 13. Further, the positions where these protrusions 11 and 12 are provided are different from each other by a central angle of 45 degrees. That is, one of the protrusions 11 and 12 is provided on the upper surface 3B of the rotary blade 3 every 45 degrees of the central angle.

また、突起物１１を設ける同心円１３の外径は、突起物１１がヘッド部材２に近接する程度の大きさとし、突起物１２を設ける同心円１４の外径は、突起物１２が突起物１１に近接する程度の大きさとして過大にはされない。 Further, the outer diameter of the concentric circle 13 on which the protrusion 11 is provided is set to a size such that the protrusion 11 is close to the head member 2, and the outer diameter of the concentric circle 14 on which the protrusion 12 is provided is that the protrusion 12 is close to the protrusion 11. It is not oversized as large as you want.

本実施例の刈払機１００に用いる刈払物巻込防止部材２１は、図４に示すように、カバー部材２６と所定の板厚を有する板材２７とからなり、カバー部材２６を操作部材１に覆ってカバー部材２７の端部に設けられる接続部２８により操作部材に取付けて用いる。 As shown in FIG. 4, the brushed material entrainment preventing member 21 used in the brush cutter 100 according to the present embodiment includes a cover member 26 and a plate material 27 having a predetermined plate thickness, and the cover member 26 is used as the operation member 1. The cover member 27 is used by being attached to the operation member by a connecting portion 28 provided at the end of the cover member 27.

上記の板材２７は、操作部材１の下部に設けられ、板材２７の両側面は回転刃３の上部表面３Ｂの垂直方向と平行になるように設けられる。また、板材２７には、所定の形状の先端部２１Ａが設けられている。この先端部２１Ａは、突起物１１とヘッド部材２と回転刃３の上部表面３Ｂとの間に生成される空間部１６に配置される。以下先端部２１Ａについて詳述する。 The plate member 27 is provided in the lower part of the operation member 1, and both side surfaces of the plate member 27 are provided in parallel with the vertical direction of the upper surface 3 B of the rotary blade 3. The plate member 27 is provided with a tip 21A having a predetermined shape. The distal end portion 21 A is disposed in the space portion 16 generated between the protrusion 11, the head member 2, and the upper surface 3 B of the rotary blade 3. Hereinafter, the tip portion 21A will be described in detail.

先端部２１Ａは、一方の側面２１Ｂが突起物１１の側面１１Ａに間隙を置いて配置され、上記先端の他方の側面２１Ｃがヘッド部材２の底部２Ａに間隙を置いて配置され、そして上記先端の底面２１Ｄが回転刃３の上部表面３Ｂに間隙を置いて配置されるような先端形状とされている。従って、先端部２１Ａは、縦断面が略矩形形状となる。なお、これらの間隙は、回転刃３の回転時に先端部２１Ａが突起部１１や回転刃３の上部表面３Ｂと接触しない程度で、略零に等しい隙間を持つように設定される。 The front end portion 21A has one side surface 21B disposed with a gap on the side surface 11A of the projection 11, the other side surface 21C of the front end disposed with a gap on the bottom portion 2A of the head member 2, and the front end portion 21A. The bottom surface 21 D has a tip shape such that the bottom surface 21 D is arranged with a gap on the upper surface 3 B of the rotary blade 3. Accordingly, the distal end portion 21A has a substantially rectangular shape in longitudinal section. These gaps are set to have a gap substantially equal to zero so that the tip 21A does not come into contact with the protrusion 11 or the upper surface 3B of the rotary blade 3 when the rotary blade 3 rotates.

また、刈払物巻込防止部材２２は、所定の板厚を有する板材２３に複数の接続部２４が設けられる構成となっており、ヘッド部材２の側面と接続部２３、２４それぞれとをねじ等によって取付固定して用いる。 Further, the brushed material entrainment preventing member 22 is configured such that a plurality of connection portions 24 are provided on a plate member 23 having a predetermined plate thickness, and the side surface of the head member 2 and each of the connection portions 23 and 24 are screwed together. It is used by attaching and fixing by, for example.

上記の板材２３は、操作部材１と平行に設けられる。また、板材２３は、所定の形状の先端部２２Ａが設けられている。この先端部２２Ａは、突起物１１、１２と回転刃３の上部表面３Ｂとの間に生成される空間部１７に配置される。以下先端部２２Ａについて詳述する。 The plate member 23 is provided in parallel with the operation member 1. The plate member 23 is provided with a tip 22A having a predetermined shape. The tip portion 22 A is disposed in the space portion 17 generated between the protrusions 11 and 12 and the upper surface 3 B of the rotary blade 3. Hereinafter, the tip portion 22A will be described in detail.

先端部２２Ａは、一方の側面２２Ｂが突起物１１の側面１１Ｂに間隙を置いて配置され、上記先端の他方の側面２２Ｃが突起物１２の側面１２Ａに間隙を置いて配置され、上記先端の底面２２Ｄが回転刃３の上部表面３Ｂに間隙を置いて配置されるような先端形状とされている。従って、先端部２２Ａは、上述の先端部２１Ａ同様に縦断面が略矩形形状となる。また、これらの間隙も先端部２１Ａ同様に、回転刃３の回転時に先端部２２Ａが突起部１１、１２や回転刃３の上部表面３Ｂと接触しない程度で、略零に等しい隙間を持つように設定される。 The tip 22A has one side 22B arranged with a gap on the side 11B of the projection 11, the other side 22C of the tip is arranged with a gap on the side 12A of the projection 12, and the bottom of the tip The tip shape is such that 22D is disposed on the upper surface 3B of the rotary blade 3 with a gap. Accordingly, the front end portion 22A has a substantially rectangular shape in the longitudinal section like the above-described front end portion 21A. Similarly to the tip portion 21A, these gaps have a gap substantially equal to zero so that the tip portion 22A does not contact the protrusions 11 and 12 and the upper surface 3B of the rotary blade 3 when the rotary blade 3 rotates. Is set.

上述の構成である本実施例の芝払機１００の刈払物の巻込み防止状況を以下に説明する。まず、刈払機１００の回転刃３を高速回転させる。従って、突起物１１、１２も高速回転する。そして、この回転する回転刃３により雑草等を刈り払った際に、刈払物の長さがヘッド部材２の底部２Ａの外径２Ｂよりも大きい場合は、ヘッド部材の底部２Ａ即ち回転刃３の中央部へ飛散して巻付こうとする。 The state of preventing the brushed material from being caught in the lawn mower 100 of the present embodiment having the above-described configuration will be described below. First, the rotary blade 3 of the brush cutter 100 is rotated at high speed. Accordingly, the protrusions 11 and 12 also rotate at high speed. Then, when weeds or the like are cut off by the rotating rotary blade 3, if the length of the cut material is larger than the outer diameter 2B of the bottom 2A of the head member 2, the bottom 2A of the head member, that is, the rotary blade 3 Try to scatter and wrap around the center.

上記の長い刈払物は、回転刃３の中央部に巻付く際に必ず刈払物巻込防止部材２１、２２の先端部２１Ａ若しくは２２Ａに接触する。しかし、これら刈払物巻込防止部材２１、２２の先端部２１Ａ、２２Ａは、両側面２１Ｂ、２１Ｃ、２２Ｂ、２２Ｃがそれぞれヘッド部材２の底部２Ａや突起物１１の側面１１Ａまたは突起物１１の側面１１Ｂや突起物１２の側面１２Ａと略隙間がなく設けられているので、先端部２１Ａ、２２Ａに接触した上記の長い刈払物は、回転する各突起物１１、１２が各先端部２１Ａ、２２Ａの側面２１Ｂ、２２Ｃを通過する際に、回転によるトルクにより長い刈払物を巻き込んで回転刃３の外部へ払い出す若しくは長い刈払物を切断し、長い刈払物が回転刃３の中央部へ巻き込むことを防止する役割を果たす。 The long brush cutter always comes into contact with the tip portion 21A or 22A of the brush cutter entanglement member 21 or 22 when it is wound around the central portion of the rotary blade 3. However, the front end portions 21A and 22A of the brushed material entrainment preventing members 21 and 22 have both side surfaces 21B, 21C, 22B, and 22C, respectively, of the bottom portion 2A of the head member 2, the side surface 11A of the projection 11, or the projection 11 respectively. Since the side surface 11B and the side surface 12A of the projection 12 are provided without a substantial gap, the long cut brush that comes into contact with the tip portions 21A and 22A has the rotating projections 11 and 12 respectively connected to the tip portions 21A and 21A. When passing through the side surfaces 21B and 22C of 22A, a long brushed product is taken up by the torque caused by the rotation and discharged to the outside of the rotary blade 3, or the long brushed product is cut, and the long brushed product is in the center of the rotary blade 3. It plays a role to prevent the part from getting caught.

また、刈払物巻込防止部材２１、２２の先端部２１Ａ、２２Ａは、底面２２Ｄ、２２Ｄも回転刃３の上部表面３Ｂとほとんど隙間がなく設けられているので、上記の長い刈払物が突起物１１、１２のトルクによって払い出される時に先端部の底面２１Ｄ、２２Ｄと回転刃３の上部表面３Ｂの隙間に回り込むこともできない。 In addition, since the front end portions 21A and 22A of the brushed material entrainment preventing members 21 and 22 are also provided with almost no gap between the bottom surfaces 22D and 22D and the upper surface 3B of the rotary blade 3, When paid out by the torque of the projections 11, 12, it is not possible to go around the gap between the bottom surfaces 21 D, 22 D of the tip and the upper surface 3 B of the rotary blade 3.

本実施例の刈払機１００は、上述のように、突起物１１、１２と刈払物巻込防止部材２１、２２を設けただけで、回転軸３０を含めた回転刃３の中央部への長い刈払物の巻込みを確実に防止できる。なお、本実施例の刈払機１００は、突起物１１と刈払物巻込防止部材２１のみでも、上述のように長い刈払物の回転刃の中央部への巻込みを防止できるが、突起物１２と刈払物巻込防止部材２２を設けるとより効果的に刈払物の回転刃の中央部への巻込みを防止することができる。 As described above, the bush cutter 100 according to the present embodiment is provided with the protrusions 11 and 12 and the bush cutter entanglement preventing members 21 and 22, and the central portion of the rotary blade 3 including the rotary shaft 30 is provided. It is possible to reliably prevent long cuts from being caught. The brush cutter 100 according to the present embodiment can prevent the long brush cutter from being caught in the central portion of the rotary blade as described above by using only the protrusion 11 and the brush cutting prevention member 21. Providing the object 12 and the brushed material entrainment preventing member 22 can more effectively prevent the mowing object from being caught in the central portion of the rotary blade.

また、本実施例の刈払機１００は、各突起物１１、１２の上面側の先端部２１Ａ、２１Ｂの近傍に、各突起物１１、１２の上面に略零に等しい隙間を置くようにして形状２１Ｅ、２２Ｅをそれぞれ設けると、より効果的に刈払物の回転刃の中央部への巻込みを防止することができる。 Further, the brush cutter 100 of the present embodiment is shaped so that a gap substantially equal to zero is placed on the upper surface of each projection 11, 12 in the vicinity of the tip portions 21 A, 21 B on the upper surface side of each projection 11, 12. Providing 21E and 22E, respectively, can more effectively prevent the brushed material from being caught in the central portion of the rotary blade.

なお、本実施例の刈払機１００は、突起物の突起部の高さ、突起物の配置数、突起物と他の突起物の配置ピッチ、巻込防止部材の先端部の回転刃半径方向の大きさおよび突起物の突起部の外径の大きさ、即ち空間部の回転半径方向の大きさ等は、刈払機１００の使用状況によって適宜変更され得るものであって、上述の記載の構成に限定されないことは言うまでもない。また、本実施例の刈払機１００を構成する刈払物巻込防止部材２１、２２の形状は、上述の効果を達成できる範囲内において、図に示した形状に限定されないことは言うまでもない。 The brush cutter 100 according to the present embodiment includes the height of the protrusions of the protrusions, the number of protrusions, the arrangement pitch of the protrusions and other protrusions, and the radial direction of the tip of the anti-roll member in the rotary blade direction. The size and the size of the outer diameter of the projection of the projection, that is, the size of the space portion in the rotational radius direction, and the like can be changed as appropriate according to the usage state of the brush cutter 100, and have the above-described configuration. It goes without saying that it is not limited. Moreover, it cannot be overemphasized that the shape of the brushing thing entrainment prevention members 21 and 22 which comprise the brush cutter 100 of a present Example is not limited to the shape shown in the figure within the range which can achieve the above-mentioned effect.

本実施例の刈払機は、また、上述したように回転刃保護部材に回転刃と所定の高さ位置を置いたそり部を備えることにより、利用者が回転刃の高さ位置を安易に保持することができて、特に操作部材の進行方向即ち前後方向に沿って滑らかに回転刃を移動することができるので、利用者による刈払作業が安定し、長時間作業による疲労を低減できる。更に、そり部間の両端間の幅寸法を回転刃の外径より大きくしたので、回転刃を外部の硬い障害物への接触による刃の消耗を低減できる。 As described above, the brush cutter according to the present embodiment includes the sled portion having the rotary blade and a predetermined height position on the rotary blade protection member, so that the user can easily hold the height position of the rotary blade. In particular, since the rotary blade can be moved smoothly along the traveling direction of the operation member, that is, the front-rear direction, the brushing work by the user is stabilized, and fatigue due to long-time work can be reduced. Furthermore, since the width dimension between both ends between the sled portions is made larger than the outer diameter of the rotary blade, the wear of the blade due to contact of the rotary blade with an external hard obstacle can be reduced.

また、本実施例の刈払機においては、回転刃の底部にそり部を設けることで、上述のように利用者による刈払作業が安定したものとなる。その結果、そり部を備えずに左右に回転刃を揺動させて雑草等を刈払うような刈払機に比べて、より雑草等を容易に根元から刈払うことができて、容易に長さの長い刈払物を生じさせることとなる。従って、本実施例の刈払機は、長い刈払物の回転刃の中央部への巻込みを防止できるので、回転刃の底部にそり部を設ける汎用の刈払機に対して特に効果的である。 Moreover, in the brush cutter of a present Example, the shaving operation by a user becomes stable as mentioned above by providing a sledge part in the bottom part of a rotary blade. As a result, weeds and the like can be more easily cut off from the root, and the length can be easily reduced compared with a brush cutter that does not have a sledge and swings the rotary blade to the left and right to cut off the weeds and the like. Will produce a long cut. Therefore, the brush cutter according to the present embodiment can prevent a long brush cutter from being wound around the central portion of the rotary blade, and is particularly effective for a general-purpose brush cutter having a sled portion at the bottom of the rotary blade. .

本発明は、上述のように構成しているので、刈払物が回転刃の中央部に巻込むことを容易に防止でき、利用者による作業性の低下を防ぐことができる。また、利用者が地面から回転刃までの高さを容易に一定に保持できるため、利用者による長時間作業による疲労を低減できる。更に、回転刃を外部の障害物から保護することができるため、回転刃の著しい消耗を抑えることができて経済的に用いることができる。 Since the present invention is configured as described above, it is possible to easily prevent the brushed material from being wound around the central portion of the rotary blade, and it is possible to prevent the workability by the user from being deteriorated. In addition, since the user can easily maintain a constant height from the ground to the rotary blade, fatigue due to long-time work by the user can be reduced. Furthermore, since the rotary blade can be protected from external obstacles, significant wear of the rotary blade can be suppressed and can be used economically.

１…操作部材、２…ヘッド部材、２Ａ…ヘッド部材の底部、２Ｂ…ヘッド部材の底部の外径、３…回転刃、３Ａ…回転刃の底部中央部、３Ｂ…回転刃の上部表面、３Ｃ…回転刃の外径（外周）、４…回転刃保護部材、４Ａ…そり部、４Ｃ…底部、５…仰角、１１、１２…突起物、１１Ｃ、１２Ｃ…突起物の側面、１３、１４…回転刃外径の同心円、１６、１７…空間部、２１、２２…刈払物巻込防止部材、２１Ｃ、２２Ｃ…先端部、２１Ｄ、２２Ｄ、２１Ｅ、２２Ｅ…先端部側面、２１Ｆ、２２Ｆ…先端部底面、６０…両側そり部間幅寸法、６１…高さ間隔、１００…刈払機。 DESCRIPTION OF SYMBOLS 1 ... Operation member, 2 ... Head member, 2A ... Bottom part of head member, 2B ... Outer diameter of bottom part of head member, 3 ... Rotary blade, 3A ... Center part of bottom part of rotary blade, 3B ... Upper surface of rotary blade, 3C ... outer diameter (outer circumference) of rotating blade, 4 ... rotating blade protecting member, 4A ... sled portion, 4C ... bottom, 5 ... elevation angle, 11, 12 ... projection, 11C, 12C ... side surface of projection, 13, 14 ... Rotating blade outer diameter concentric circles, 16, 17 ... space part, 21, 22 ... cutting material entrainment prevention member, 21C, 22C ... tip part, 21D, 22D, 21E, 22E ... tip part side face, 21F, 22F ... tip Bottom surface, 60 ... width dimension between both side sled parts, 61 ... height interval, 100 ... brush cutter.

Claims

操作部材と、該操作部材の一端に設けられるヘッド部材と、該操作部材の他端に設けられる駆動源と、前記ヘッド部材の底部に回転可能に接続される回転刃と、該回転刃の底部中央部に接続される回転刃保護部材とから構成され、前記ヘッド部材は前記操作部材を前記回転刃の上部表面に対して所定の仰角を形成して回転刃に接続するように構成され、前記回転刃は前記駆動源による駆動力により回転駆動される刈払機において、
前記回転刃の上部表面には該回転刃の外周と同心となり、前記ヘッド部材の底部の外径よりも大きくされた同心円の円上に複数の突起物が前記ヘッド部材に近接して、かつ該上部表面に対して垂直方向に延びるように設けられ、前記突起物とヘッド部材と回転刃の上部表面との間に生成される空間部に、前記操作部材に取付けられ、先端の一方の側面が前記突起物の側面に間隙を置いて配置され、該先端の他方の側面が前記ヘッド部材の底部に間隙を置いて配置され、該先端の底面が前記回転刃の上部表面に間隙を置いて配置される先端部を有する刈払物巻込防止部材が設けられること
を特徴とする刈払機。 An operation member, a head member provided at one end of the operation member, a drive source provided at the other end of the operation member, a rotary blade rotatably connected to the bottom of the head member, and a bottom of the rotary blade A rotary blade protection member connected to a central portion, and the head member is configured to connect the operation member to the rotary blade by forming a predetermined elevation angle with respect to the upper surface of the rotary blade, In the brush cutter that is driven to rotate by the driving force of the driving source,
The upper surface of the rotary blade is concentric with the outer periphery of the rotary blade, and a plurality of protrusions are close to the head member on a concentric circle made larger than the outer diameter of the bottom of the head member, and It is provided so as to extend in a direction perpendicular to the upper surface, and is attached to the operation member in a space generated between the protrusion, the head member, and the upper surface of the rotary blade, and one side surface of the tip is The protrusion is disposed with a gap on the side surface, the other side surface of the tip is disposed with a gap at the bottom of the head member, and the bottom surface of the tip is disposed with a gap on the upper surface of the rotary blade. A brush cutter comprising: a brush cutter prevention member having a tip portion that is provided.

請求項１において、前記回転刃の上部表面には該回転刃の外周と同心となり、前記ヘッド部材の底部の外径よりも大きくされた同心円よりも大きくされた同心円の円上に複数の他の突起物が前記突起物に近接して、かつ該上部表面に対して垂直方向に延びるように設けられ、前記突起物と他の突起物と回転刃の上部表面との間に生成される空間部に、前記ヘッド部材に取付けられ、先端の一方の側面が前記突起物の側面に間隙を置いて配置され、該先端の他方の側面が前記他の突起物の側面に間隙を置いて配置され、該先端の底面が前記回転刃の上部表面に間隙を置いて配置される先端部を有する他の刈払物巻込防止部材が設けられることを特徴とする刈払機。 2. The upper surface of the rotary blade according to claim 1, wherein the upper surface of the rotary blade is concentric with the outer periphery of the rotary blade, and a plurality of other concentric circles are formed on a concentric circle larger than the concentric circle larger than the outer diameter of the bottom of the head member. A space formed between the protrusion, another protrusion, and the upper surface of the rotary blade, the protrusion being provided so as to extend in a direction perpendicular to the upper surface and the protrusion. Attached to the head member, one side surface of the tip is disposed with a gap on the side surface of the projection, and the other side surface of the tip is disposed with a gap on the side surface of the other projection, brush cutter, wherein the other harvest払物winding prevention member having a tip bottom surface of the tip is placed with a gap on the upper surface of the rotary blade is provided.

請求項１または２において、前記回転刃保護部材の両側には前記操作部材の長手方向に延び、両端が回転刃側に反ったそり部材がそれぞれ複数設けられ、前記回転刃保護部材の両側面に設けられたそり部材のうち外側に設けられた各そり部材間の幅寸法は前記回転刃の外径よりも大きくされ、前記そり部材と前記回転刃との間は所定の高さ間隔が設けられることを特徴とする刈払機。 According to claim 1 or 2, wherein the rotation on both sides of the blade protection member extends in the longitudinal direction of the operating member, both ends sled member warped rotary blade side are provided a plurality respectively, on both sides of the rotary blade protection member The width dimension between each sled member provided outside among the provided sled members is larger than the outer diameter of the rotary blade, and a predetermined height interval is provided between the sled member and the rotary blade. A brush cutter characterized by that.