JP2009082081A

JP2009082081A - Portable working implement

Info

Publication number: JP2009082081A
Application number: JP2007257527A
Authority: JP
Inventors: Sakuji Yamada; 策次山田
Original assignee: Yamada Kikai Kogyo KK
Current assignee: Yamada Kikai Kogyo KK
Priority date: 2007-10-01
Filing date: 2007-10-01
Publication date: 2009-04-23

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable working implement capable of conducting operations more lightly with an operative tube swinging around left and right. <P>SOLUTION: The portable working implement includes an operative tube 400, a rotary working element supported on the tip of the operative tube 400, a power source joined via a flexible tube 500 to the basal end of the operative tube 400 and supported on a shoulder frame, and a transmission shaft 300 threaded through the flexible tube 500 or the operative tube 400 and functioning to transmit the rotary output of the power source to the rotary working element. In this portable working implement, a first joint member 600 which is rectangular to the axis of the operative tube 400, extends nearly vertically and is bendable around the stationary axis relative to the operative tube 400 is interposed in between the operative tube 400 and the flexible tube 500, and the transmission shaft 300 is so designed that its portion threaded at least through the flexible tube 500 is made flexible and also penetrated through the first joint member 600. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本願発明は、地表に生育する雑草等の草木をその根元付近から刈払う作業に用いる携帯式動力刈払機等、小型エンジン等の動力源の回転出力を利用して作業を行なう携帯式作業機に関し、特に、背負い枠に搭載したエンジンからの回転出力を利用して作業を行うように構成したものに関する。 The present invention relates to a portable work machine that performs work using the rotational output of a power source such as a small engine, such as a portable power brush cutter that is used to cut off weeds and other plants that grow on the ground surface from the vicinity of the root. In particular, the present invention relates to a configuration in which work is performed using rotational output from an engine mounted on a backpack frame.

本願の発明者はすでに、この種の携帯式作業機を提案している（特許文献１の図９〜図１２）。この従来の携帯式作業機は、操作管の先端に支持した回転作業体を、エンジンと操作管との間をつなぐ可撓管ないし上記操作管に通挿された伝動軸を介して回転させる構成となっている。すなわち、エンジンの回転出力は、上記の伝動軸を介して回転作業体に伝達され、この回転作業体を回転させる。伝動軸は、少なくとも可撓管に通挿される区間において、可撓性を備える。上記特許文献１の構成ではとくに、エンジンと可撓管との間、および、可撓管と操作管との間に関節部材を介装し、この関節部材を伝動軸が貫通するようにしており、操作管を左右に振回して作業を行うに際し、操作管に対して可撓管が自由に屈曲するようにして、作業の軽快性を高めている。 The inventor of the present application has already proposed this type of portable work machine (FIGS. 9 to 12 of Patent Document 1). This conventional portable work machine is configured to rotate a rotating work body supported at the tip of an operation tube via a flexible tube connecting the engine and the operation tube or a transmission shaft inserted through the operation tube. It has become. That is, the rotational output of the engine is transmitted to the rotating work body through the transmission shaft, and the rotating work body is rotated. The transmission shaft has flexibility at least in a section inserted through the flexible tube. In the configuration of Patent Document 1 above, in particular, a joint member is interposed between the engine and the flexible tube, and between the flexible tube and the operation tube, and the transmission shaft passes through the joint member. When the operation tube is swung from side to side, the flexible tube is freely bent with respect to the operation tube to improve the lightness of the operation.

特開２００４−１４７６１０号公報（図９〜１２）JP 2004-147610 A (FIGS. 9 to 12)

しかしながら、上記特許文献１の構成では、操作管と可撓管との間に介在させる関節部材が、操作管に対して自由に軸転する構成としてあったため、かえって作業の軽快性を阻害することを発見した。 However, in the configuration of Patent Document 1, since the joint member interposed between the operation tube and the flexible tube is configured to freely rotate with respect to the operation tube, the lightness of the work is hindered. I found

すなわち、操作管の後端に対し、可撓管が、その自重で垂れ下がったまま操作管の振回操作に伴って揺動するため、第１に、操作管に対する可撓管の屈曲度が所定以上となり、伝動軸が関節部材に接触して回転し、これにともなってエンジンの回転出力が無駄に消費されるとともに、関節部材ないし可撓管が熱を帯びることになっていた。このことは、エンジンの出力低下と作業機の寿命の短縮につながる。また、第２に、可撓管がふらつくため、操作管をスムーズに左右に振回することができず、操作管の振回操作が不安定となっていた。 That is, the flexible tube swings with the swinging operation of the operation tube while hanging down with its own weight with respect to the rear end of the operation tube. First, the bending degree of the flexible tube with respect to the operation tube is predetermined. As described above, the transmission shaft rotates in contact with the joint member, and as a result, the rotational output of the engine is wasted, and the joint member or the flexible tube is heated. This leads to a decrease in engine output and a shortened working machine life. Second, since the flexible tube fluctuates, the operation tube cannot be smoothly swung from side to side, and the swing operation of the operation tube has become unstable.

本願発明は、上記した事情のもとで考え出されたものである。本願発明の目的は、背負い枠に支持したエンジンからの出力を可撓管に通挿された伝動軸を介して操作管の先端に支持した回転作業体に伝達し、これを回転させる携帯式作業機において、より操作の軽快性を高めることができるとともに、伝動軸ないし可撓管の不当な発熱を抑制することができるようにすることである。 The present invention has been conceived under the circumstances described above. The object of the present invention is a portable work in which the output from the engine supported by the back frame is transmitted to the rotating work body supported at the tip of the operation tube via the transmission shaft inserted through the flexible tube, and this is rotated. In the machine, it is possible to further improve the lightness of the operation and to suppress the undue heat generation of the transmission shaft or the flexible tube.

上記の課題を解決するため、本願発明では、次の技術的手段を採用した。 In order to solve the above problems, the present invention employs the following technical means.

すなわち、本願発明によって提供される携帯式作業機は、操作管と、この操作管の先端に支持させた回転作業体と、この操作管の基端に可撓管を介して連結され、かつ背負い枠に支持された動力源と、上記可撓管ないし操作管の内部に通挿され、上記動力源の回転出力を上記回転作業体に伝達する伝動軸とを備えた携帯式作業機において、上記操作管と上記可撓管との間には、略垂直状に延び、かつ上記操作管に対して固定状の軸を中心として屈曲可能な第１の関節部材が介装されおり、かつ、上記伝動軸は、少なくとも上記可撓管に通挿される部分が可撓部とされているとともに、この可撓部が上記第１の関節部材を貫通させられていることを特徴とする。 That is, the portable work machine provided by the present invention is connected to the operating tube, the rotating working body supported at the distal end of the operating tube, and the base end of the operating tube via the flexible tube, and is carried on the back. A portable work machine comprising: a power source supported by a frame; and a transmission shaft that is inserted into the flexible tube or the operation tube and transmits a rotational output of the power source to the rotating work body. Between the operation tube and the flexible tube, a first joint member extending in a substantially vertical shape and capable of being bent around a fixed axis with respect to the operation tube is interposed, and The transmission shaft is characterized in that at least a portion inserted through the flexible tube is a flexible portion, and the flexible portion is passed through the first joint member.

このような構成によれば、操作管と可撓管は、略水平面内において相互屈曲回動可能となる。すなわち、操作管の後端につづく可撓管が自重によって垂れ下がることがなく、しかも、操作管の左右振回操作に応じて、可撓管と操作管との連結部分が水平面内において柔軟に屈曲する。そのため、操作管の左右振回操作の軽快さが維持されつつ、操作管に対する可撓管の不当な程度までの屈曲が防止され、第１の関節部材に対する伝動軸の長時間接触による出力低下や発熱が防止される。 According to such a configuration, the operation tube and the flexible tube can be bent and bent in a substantially horizontal plane. That is, the flexible tube that follows the rear end of the operation tube does not hang down due to its own weight, and the flexible tube and the operation tube are flexibly bent in the horizontal plane according to the left / right swinging operation of the operation tube. To do. Therefore, while maintaining the lightness of the left and right swinging operation of the operating tube, the flexible tube is prevented from being bent to an unreasonable degree with respect to the operating tube, and the output is reduced due to the long-time contact of the transmission shaft with the first joint member. Heat generation is prevented.

好ましい実施の形態では、上記第１の関節部材は、上記操作管側に位置する第１部材と、上記可撓管側に位置する第２部材とを有しており、上記第１部材は上記操作管に固定状に連結されているとともに、上記第２部材は、上記第１部材に対して上記固定状の軸を中心として回動可能に連結されている。 In a preferred embodiment, the first joint member includes a first member located on the operation tube side and a second member located on the flexible tube side, and the first member is While being fixedly connected to the operation tube, the second member is connected to the first member so as to be rotatable about the fixed shaft.

好ましい実施の形態ではまた、上記第１の関節部材の上記第１部材は、上記操作管に連結される筒部と、この筒部から二股ホーク状に延びる一対の対向壁とを有する一方、上記第１の関節部材の上記第２部材は、上記可撓管に連結される筒部と、この筒部から二股ホーク状に延び、上記第１部材の上記一対の対向壁の内側または外側に隣接して位置する一対の対向壁と、内外に隣接する対向壁どうしを相互回動可能に連結して上記第１部材と上記第２部材間を連結し、かつ、上記固定状の軸を構成する連結軸とを備えており、上記伝動軸は、上記一対の対向壁間を貫通している。 In a preferred embodiment, the first member of the first joint member has a cylindrical portion connected to the operation tube and a pair of opposing walls extending in a bifurcated fork form from the cylindrical portion. The second member of the first joint member extends in a bifurcated fork shape from the cylindrical portion connected to the flexible tube, and is adjacent to the inside or the outside of the pair of opposing walls of the first member. A pair of opposing walls positioned opposite to each other and the opposing walls adjacent to each other inside and outside are connected to each other so that the first member and the second member are connected to each other, and the fixed shaft is configured. A transmission shaft, and the transmission shaft penetrates between the pair of opposed walls.

好ましい実施の形態ではさらに、上記第１の関節部材の上記第１部材の上記筒部、および上記第２部材の上記筒部には、相手部材に向かうにつれて拡開し、上記伝動軸を内包するテーパ孔が形成されている。 In a preferred embodiment, the cylindrical portion of the first member of the first joint member and the cylindrical portion of the second member are further expanded toward the mating member and include the transmission shaft. A tapered hole is formed.

好ましい実施の形態ではまた、上記第１の関節部材は、上記第１部材に対する上記第２部材の上記固定状の軸を中心とした回動範囲を規制する規制手段が設けられており、この規制手段は、上記第１部材に対し、上記第２部材が、上記第１部材の軸線を挟んで片側３０〜４０°、両側６０〜８０°の範囲で回動しうるように構成されている。 In a preferred embodiment, the first joint member is provided with a restricting means for restricting a rotation range around the fixed shaft of the second member with respect to the first member. The means is configured such that the second member can be rotated with respect to the first member in a range of 30 to 40 ° on one side and 60 to 80 ° on both sides across the axis of the first member.

好ましい実施の形態では、上記可撓管と上記動力源との間には、上記動力源の出力軸の軸線と直交し、上記出力軸周りに自由に旋回可能な軸を中心として屈曲可能な第２の関節部材が介装されており、かつ、上記伝動軸の可撓部が上記第２の関節部材を貫通させられている。 In a preferred embodiment, the flexible tube and the power source may be bent between an axis of an output shaft of the power source, which is perpendicular to an axis of the power source and can be freely turned around the output shaft. Two joint members are interposed, and the flexible portion of the transmission shaft is passed through the second joint member.

このような構成によれば、上記した第１の関節部材に加えて可撓管と動力源との間に第２の関節部材が設けられているので、可撓管が動力源の出力軸に対して所定角度屈曲した状態でこの動力源の出力軸を中心として自由揺動しうる。したがって、操作管を左右に振回操作することに伴う可撓管の移動に対する抵抗が少なくなり、操作管のより軽快な振回操作が可能となる。 According to such a configuration, since the second joint member is provided between the flexible tube and the power source in addition to the first joint member described above, the flexible tube serves as the output shaft of the power source. On the other hand, it can freely swing around the output shaft of the power source in a state bent at a predetermined angle. Therefore, resistance to the movement of the flexible tube due to the swinging operation of the operation tube from side to side is reduced, and a lighter swinging operation of the operation tube is possible.

好ましい実施の形態ではまた、上記第２の関節部材は、上記動力源側に位置する第１部材と、上記可撓管側に位置する第２部材とを有しており、上記第１部材は上記動力源に対してその出力軸の軸線周りに軸転可能に連結されているとともに、上記第２部材は、上記第１部材に対して上記第１部材の軸線に直交する軸を中心として回動可能に連結されている。 In a preferred embodiment, the second joint member includes a first member located on the power source side and a second member located on the flexible tube side, and the first member is The second member is connected to the power source so as to be rotatable about the axis of its output shaft, and the second member rotates about an axis perpendicular to the axis of the first member with respect to the first member. It is linked movably.

好ましい実施の形態ではさらに、上記第２の関節部材の上記第１部材は、上記動力源に軸転可能に連結される筒部と、この筒部から二股ホーク状に延びる一対の対向壁とを有する一方、上記第２の関節部材の上記第２部材は、上記可撓管に連結される筒部と、この筒部から二股ホーク状に延び、上記第１部材の上記一対の対向壁の内側または外側に隣接して位置する一対の対向壁と、内外に隣接する対向壁どうしを相互回動可能に連結して上記第１の部材と上記第２の部材間を連結し、かつ、上記軸を構成する連結軸とを備えており、上記伝動軸は、上記一対の対向壁間を貫通している。 In a preferred embodiment, the first member of the second joint member further includes a cylindrical portion connected to the power source so as to be able to rotate and a pair of opposing walls extending from the cylindrical portion in a bifurcated fork shape. On the other hand, the second member of the second joint member includes a cylindrical portion connected to the flexible tube and a bifurcated fork shape extending from the cylindrical portion, and the inside of the pair of opposing walls of the first member. Alternatively, the pair of opposing walls positioned adjacent to the outside and the opposing walls adjacent to the inside and the outside are connected to each other so as to be capable of mutual rotation, and the first member and the second member are connected to each other, and the shaft And the transmission shaft penetrates between the pair of opposing walls.

好ましい実施の形態ではまた、上記第２の関節部材の上記第１部材の上記筒部、および上記第２部材の上記筒部には、相手部材に向かうにつれて拡開し、上記伝動軸を内包するテーパ孔が形成されている。 In a preferred embodiment, the cylindrical portion of the first member of the second joint member and the cylindrical portion of the second member are expanded toward the mating member and include the transmission shaft. A tapered hole is formed.

好ましい実施のではさらに、上記第２の関節部材は、上記第１部材に対する上記第２部材の上記軸を中心とした回動範囲を規制する規制手段が設けられており、この規制手段は、上記第１部材に対し、上記第２部材が、上記第１部材の軸線を挟んで片側３０〜４０°、両側６０〜８０°の範囲で回動しうるように構成されている。 In a preferred embodiment, the second joint member is provided with a restricting means for restricting a rotation range around the axis of the second member with respect to the first member. The second member is configured to be rotatable with respect to the first member in a range of 30 to 40 ° on one side and 60 to 80 ° on both sides across the axis of the first member.

本願発明のその他の特徴および利点は、図面を参照して以下に行なう詳細な説明から、明らかとなろう。 Other features and advantages of the present invention will become apparent from the detailed description given below with reference to the drawings.

以下、本願発明の好ましい実施の形態につき、図面を参照して具体的に説明する。 Hereinafter, a preferred embodiment of the present invention will be specifically described with reference to the drawings.

図１は、本願発明の一実施形態に係る携帯式作業機１００の全体構成を示す。この携帯式作業機１００は、いわゆる背負い式に構成されており、動力源としてのエンジン２００を搭載した背負い枠２２と、先端に回転作業体としての回転刃４１０を支持する所定長さ直線状に延びる操作管４００と、この操作管４００と上記エンジン２００との間に介装された可撓管５００を備えて大略構成されている。 FIG. 1 shows an overall configuration of a portable work machine 100 according to an embodiment of the present invention. This portable work machine 100 is configured as a so-called backpack type, and is linear with a predetermined length that supports a backpack frame 22 on which an engine 200 as a power source is mounted and a rotary blade 410 as a rotating work body at the tip. The operation tube 400 extends and the flexible tube 500 interposed between the operation tube 400 and the engine 200 is generally configured.

エンジン２００は、小型２サイクルガソリンエンジンが好ましくは用いられ、図に示す実施形態では、このエンジン２００は、支持フレーム２１に支持された状態で、上記背負い枠２２に対し、垂直方向の軸線周りに回転可能となるように支持されているが、エンジンの形式および背負い枠に対する支持の方法はこれに限られず、たとえば、エンジン２００を背負い枠２２に対して固定状に搭載しても、もちろんよい。 As the engine 200, a small two-cycle gasoline engine is preferably used. In the embodiment shown in the figure, the engine 200 is supported by the support frame 21 around the vertical axis with respect to the back frame 22. Although it is supported so as to be rotatable, the type of engine and the method of supporting the back frame are not limited to this. For example, the engine 200 may be mounted fixedly on the back frame 22.

図５に詳示するように、エンジン２００のクラッチハウジング２１０には、クラッチドラム２２０が基端に連結された出力軸２２１が軸転可能に支持されている。この出力軸２２１には、可撓性の伝動軸３００の基端が嵌合連結されており、出力軸２２１の回転は、この伝動軸３００の軸転として伝えられ、後記するように操作管４００の先端に支持された回転刃４１０を回転させる。 As shown in detail in FIG. 5, the clutch housing 210 of the engine 200 supports an output shaft 221 having a clutch drum 220 connected to the base end so as to be rotatable. A base end of a flexible transmission shaft 300 is fitted and connected to the output shaft 221, and the rotation of the output shaft 221 is transmitted as the rotation of the transmission shaft 300, and the operation tube 400 is described later. The rotary blade 410 supported at the tip of the blade is rotated.

操作管４００と可撓管５００との間には、第１の関節部材６００が介装され、また、可撓管５００とエンジン２００（クラッチハウジング２１０）との間には、第２の関節部材７００が介装されている。伝動軸３００は、第２の関節部材７００を貫通して可撓管５００の内部を延び、第１の関節部材６００を貫通して操作管４００の内部を延び、操作管４００の先端までいたって、ベベルギア機構４２０の入力軸４２１に連結されている（図２参照）。操作管４００の先端部では、図２に示すように、上記ベベルギア機構４２０によって方向が転換された回転刃支持軸４２２に対し、回転刃４１０が取付けられている。 A first joint member 600 is interposed between the operation tube 400 and the flexible tube 500, and a second joint member is interposed between the flexible tube 500 and the engine 200 (clutch housing 210). 700 is interposed. The transmission shaft 300 passes through the second joint member 700 and extends in the flexible tube 500, passes through the first joint member 600 and extends in the operation tube 400, and reaches the tip of the operation tube 400. The bevel gear mechanism 420 is connected to the input shaft 421 (see FIG. 2). As shown in FIG. 2, a rotary blade 410 is attached to the rotary blade support shaft 422 whose direction is changed by the bevel gear mechanism 420 at the distal end portion of the operation tube 400.

操作管４００の内部では、図３に示すように、伝動軸３００は、保持管４４０に通挿された状態で軸転可能に保持されている。また、可撓管５００の内部においては、伝動軸３００は、可撓管５００の内孔５１０に直接通挿され、軸転可能に保持されている。 As shown in FIG. 3, the transmission shaft 300 is held inside the operation tube 400 so as to be rotatable while being inserted through the holding tube 440. Further, in the flexible tube 500, the transmission shaft 300 is directly inserted into the inner hole 510 of the flexible tube 500 and is held so as to be capable of rotating.

可撓管５００は、たとえばコイル状に巻かれた金属心材を筒状に成形した樹脂あるいは合成ゴム内にインサートされた構成をもち、軸方向の圧力に強く、かつ、所定の抵抗をもって撓曲しうる公知のものを用いることができる。 The flexible tube 500 has, for example, a configuration in which a metal core wound in a coil shape is inserted into a resin or synthetic rubber formed into a cylindrical shape, and is flexible with a predetermined resistance against an axial pressure. The well-known thing which can be used can be used.

図１に示すように、操作管４００にはまた、軸方向の適所において、左右に突出するようにしてグリップハンドル４５０が設けられており、また、この操作管４００の適所には、エンジンの回転数を制御するためのスロットルレバー（図示略）が設けられる。この携帯式作業機１００は、背負い枠２２が作業者に背負われた状態において、上記グリップハンドル４５０を把持した作業者が、操作管４００を左右に振回操作して、回転する回転刃４１０を地面に沿って移動させることにより、刈払い作業を行う。 As shown in FIG. 1, the operation tube 400 is also provided with a grip handle 450 so as to protrude right and left at an appropriate position in the axial direction, and the rotation of the engine is provided at an appropriate position of the operation tube 400. A throttle lever (not shown) for controlling the number is provided. In the portable work machine 100, the operator holding the grip handle 450 swings the operation tube 400 right and left to rotate the rotating blade 410 while the back frame 22 is carried by the operator. Mowing work is performed by moving along the ground.

さて、この携帯式作業機１００においては、操作管４００と可撓管５００との間に介装された第１の関節部材６００、および、可撓管５００とエンジン２００との間に介装された第２の関節部材７００の構成に特徴づけられる。以下、説明する。 In the portable work machine 100, the first joint member 600 interposed between the operation tube 400 and the flexible tube 500, and the flexible tube 500 and the engine 200 are interposed. Further, the second joint member 700 is characterized by the configuration. This will be described below.

図３および図４は、第１の関節部材６００の一例を示している。この第１の関節部材６００は、操作管側の第１部材６１０と、可撓管側の第２部材６２０とを有している。 3 and 4 show an example of the first joint member 600. The first joint member 600 includes a first member 610 on the operation tube side and a second member 620 on the flexible tube side.

第１部材６１０は、操作管４００の基端側に回転不能状態に内嵌される筒部６１１と、この筒部６１１から後方に延びる連絡部６１２と、この連絡部６１２の後端において、上下に二股ホーク状に延びる一対の対向壁６１３とを備える。筒部６１１の内部には、保持管４４０の後端部が嵌合連結される。連絡部６１２の内孔６１２ａは、後方に向かうほど水平方向に拡開するテーパ状となっている。上下一対の対向壁６１３の内面間寸法は、連絡部６１２の内孔６１２ａの上下寸法より大となっており、連絡部６１２と上下一対の対向壁６１３との間には、筒部６１１の軸線と直交する垂直状の段部６１４が形成されている。また、一対の対向壁６１３には、厚み方向に貫通する連結孔６１３ａが設けられているとともに、外周には、円弧部６１３ｂが形成されている。 The first member 610 includes a cylindrical portion 611 that is fitted in a non-rotatable state on the proximal end side of the operation tube 400, a connecting portion 612 that extends rearward from the cylindrical portion 611, and a rear end of the connecting portion 612. And a pair of opposing walls 613 extending in a bifurcated fork shape. The rear end portion of the holding tube 440 is fitted and connected to the inside of the cylindrical portion 611. The inner hole 612a of the connecting portion 612 has a tapered shape that expands in the horizontal direction toward the rear. The dimension between the inner surfaces of the pair of upper and lower opposing walls 613 is larger than the dimension of the inner hole 612a of the connecting portion 612, and the axis of the cylinder portion 611 is between the connecting portion 612 and the pair of upper and lower opposing walls 613. A vertical step portion 614 orthogonal to is formed. The pair of opposing walls 613 are provided with a connecting hole 613a penetrating in the thickness direction, and an arc portion 613b is formed on the outer periphery.

第２部材６２０は、可撓管５００の先端に外嵌される筒部６２１と、この筒部６２１から先端に延びる連絡部６２２と、この連絡部６２２の先端において、上下に二股ホーク状に延びる一対の対向壁６２３とを備える。連絡部６２２の内孔６２２ａは、前方に向かうほど水平方向に拡開するテーパ状となっている。上下一対の対向壁６２３の外面間寸法は、上記第１部材６１０の一対の対向壁６１３の内面間寸法に対応させられている。また、上下一対の対向壁６２３の内面間寸法は、少なくとも、伝動軸３００の外径よりもわずかに大に設定されている。さらに、この一対の対向壁６２３には、厚み方向に貫通するねじ穴６２３ａが設けられている。さらに、この一対の対向壁６２３の先端部は、上記第１部材６１０の段部６１４に当接して第１部材６１０に対する第２部材６２０の回動範囲を規制するための規制面６２３ｂが、この第２部材６２０の軸線に対して直交する直線に対して４０°以内の角度をもって形成されている。 The second member 620 has a cylindrical part 621 fitted on the distal end of the flexible tube 500, a communication part 622 extending from the cylindrical part 621 to the distal end, and a bifurcated fork shape at the distal end of the communication part 622. A pair of opposing walls 623. The inner hole 622a of the connecting portion 622 has a tapered shape that expands in the horizontal direction toward the front. The dimension between the outer surfaces of the pair of upper and lower opposing walls 623 is made to correspond to the dimension between the inner surfaces of the pair of opposing walls 613 of the first member 610. Further, the dimension between the inner surfaces of the pair of upper and lower opposing walls 623 is set to be slightly larger than at least the outer diameter of the transmission shaft 300. Further, a screw hole 623a penetrating in the thickness direction is provided in the pair of opposing walls 623. Further, the front ends of the pair of opposing walls 623 come into contact with the stepped portion 614 of the first member 610, and a regulating surface 623b for regulating the rotation range of the second member 620 relative to the first member 610 The second member 620 is formed with an angle of 40 ° or less with respect to a straight line orthogonal to the axis of the second member 620.

上記第１部材６１０と第２部材６２０とは、図３に示すように、第１部材６１０の対向壁６１３に設けた連結孔６１３ａに通したねじ６３０を第２部材６２０の対向壁６２３のねじ穴６２３ａにねじ込むことにより、相互に連結される。このとき、伝動軸３００は、第１部材６１０の内孔６１２ａ、第２部材６２０の一対の対向壁６２３の間、および第２部材６２０の内孔６２２ａを連通挿しており、このようにして、この第１の関節部材６００を貫通させられている。なお、上記ねじ６３０は、その頭部６３１の首下部に第１部材６１０の対向壁６１３の厚みよりやや長い支軸部６３２を有していることにより、第２部材６２０は、第１部材６１０に対し、上記ねじ６３０の軸線を中心として回動自由となる。上記したように、第２部材６２０の対向壁６２３の先端には、規制面６２３ｂが形成されているので、第２部材６２０は、第１部材６１０に対し、第１部材６１０の軸線方向を中心として、片側４０°以内、両側８０°以内の角度範囲内を回動しうる。上記ねじ６３０の延びる方向は、この携帯式作業機の使用時、ほぼ垂直方向を向くように設定される。これにより、操作管４００に対して可撓管５００は、この第１の関節部材６００により、ほぼ水平方向に回動可能となり、操作管４００に対して可撓管５００が自重によって下方に屈曲するという状況は生じなくなる。 As shown in FIG. 3, the first member 610 and the second member 620 include a screw 630 passed through a connection hole 613 a provided in the opposing wall 613 of the first member 610 and a screw of the opposing wall 623 of the second member 620. They are connected to each other by screwing into the holes 623a. At this time, the transmission shaft 300 is inserted through the inner hole 612a of the first member 610, the pair of opposing walls 623 of the second member 620, and the inner hole 622a of the second member 620, and thus, The first joint member 600 is penetrated. The screw 630 has a support shaft portion 632 slightly longer than the thickness of the opposing wall 613 of the first member 610 at the lower neck portion of the head portion 631, so that the second member 620 is the first member 610. On the other hand, it is freely rotatable around the axis of the screw 630. As described above, since the regulation surface 623b is formed at the tip of the opposing wall 623 of the second member 620, the second member 620 is centered about the axial direction of the first member 610 with respect to the first member 610. Can be rotated within an angle range of 40 ° on one side and 80 ° on both sides. The direction in which the screw 630 extends is set so as to face substantially the vertical direction when the portable work machine is used. As a result, the flexible tube 500 can be rotated in the substantially horizontal direction by the first joint member 600 with respect to the operation tube 400, and the flexible tube 500 is bent downward by its own weight with respect to the operation tube 400. This situation no longer occurs.

図５および図６は、第２の関節部材７００の一例を示している。この第２の関節部材７００は、エンジン側の第１部材７１０と、可撓管側の第２部材７２０とを有している。 5 and 6 show an example of the second joint member 700. FIG. The second joint member 700 includes a first member 710 on the engine side and a second member 720 on the flexible tube side.

第１部材７１０は、エンジン２００のクラッチハウジング２１０の筒部２２５に軸転可能に内嵌される筒部７１１と、この筒部７１１から先端側に二股ホーク状に延びる一対の対向壁７１３とを備える。筒部７１１の外周には、Ｏリング溝７１１ａと、環状溝７１１ｂとが形成されている。この筒部７１１は、クラッチハウジング２１０の筒部２２５に挿入された状態で、ノックピン２２６が上記環状溝７１１ｂに位置させられることにより、クラッチハウジング２１０に対する抜けが防止されつつ、クラッチハウジング２１０に対して軸転可能となり、かつ、Ｏリング溝７１１ａに装着されたＯリング２２７により、クラッチハウジング２１０の内外の気密性が確保される。この第１部材７１０の筒部７１１の内孔７１１ｃは、前方に向かうほど幅方向に拡開するテーパ状となっている。一対の対向壁７１３の内面間寸法は、筒部７１１の内孔７１１ｃの上下寸法より大となっており、一対の対向壁７１３の基端部に隣接するようにして、筒部７１１の軸線と直交する垂直状の段部７１４が形成されている。また、一対の対向壁７１３には、厚み方向に貫通する連結孔７１３ａが設けられているとともに、外周には、円弧部７１３ｂが形成されている。 The first member 710 includes a cylindrical portion 711 that is fitted into the cylindrical portion 225 of the clutch housing 210 of the engine 200 so as to be rotatable and a pair of opposing walls 713 that extend in a bifurcated fork shape from the cylindrical portion 711 toward the distal end side. Prepare. An O-ring groove 711 a and an annular groove 711 b are formed on the outer periphery of the cylindrical portion 711. The cylindrical portion 711 is inserted into the cylindrical portion 225 of the clutch housing 210, and the knock pin 226 is positioned in the annular groove 711b. The O-ring 227 that can rotate about the shaft and is mounted in the O-ring groove 711 a ensures airtightness inside and outside the clutch housing 210. The inner hole 711c of the cylindrical portion 711 of the first member 710 has a tapered shape that expands in the width direction as it goes forward. The dimension between the inner surfaces of the pair of opposing walls 713 is larger than the vertical dimension of the inner hole 711c of the cylindrical part 711, and is adjacent to the base end part of the pair of opposing walls 713 and the axis of the cylindrical part 711. An orthogonal vertical step 714 is formed. The pair of opposing walls 713 are provided with a connecting hole 713a penetrating in the thickness direction, and an arc portion 713b is formed on the outer periphery.

第２部材７２０は、可撓管５００の基端に外嵌される筒部７２１と、この筒部７２１から後方側に延びる連絡部７２２と、この連絡部７２２の先端において、上下に二股ホーク状に延びる一対の対向壁７２３とを備える。連絡部７２２の内孔７２２ａは、後方に向かうほど幅方向に拡開するテーパ状となっている。上下一対の対向壁７２３の外面間寸法は、上記第１部材７１０の一対の対向壁７１３の内面間寸法に対応させられている。また、上下一対の対向壁７２３の内面間寸法は、少なくとも、伝動軸３００の外径よりもわずかに大に設定されている。さらに、この一対の対向壁７２３には、厚み方向に貫通するねじ穴７２３ａが設けられている。さらに、この一対の対向壁７２３の端部は、上記第１部材７１０に形成された上記段部７１４に当接して第１部材７１０に対する第２部材７２０の回動範囲を規制するための規制面７２３ｂが、この第２部材７２０の軸線に対して直交する直線に対して４０°以内の角度をもって形成されている。 The second member 720 includes a cylindrical portion 721 fitted on the proximal end of the flexible tube 500, a connecting portion 722 extending rearward from the cylindrical portion 721, and a bifurcated fork shape at the tip of the connecting portion 722. And a pair of opposing walls 723 extending in the direction. The inner hole 722a of the connecting portion 722 has a tapered shape that expands in the width direction as it goes rearward. The dimension between the outer surfaces of the pair of upper and lower opposing walls 723 is made to correspond to the dimension between the inner surfaces of the pair of opposing walls 713 of the first member 710. Further, the dimension between the inner surfaces of the pair of upper and lower opposing walls 723 is set to be slightly larger than at least the outer diameter of the transmission shaft 300. Further, the pair of opposing walls 723 are provided with screw holes 723a penetrating in the thickness direction. Further, the end surfaces of the pair of opposing walls 723 are in contact with the stepped portion 714 formed on the first member 710 to restrict the rotation range of the second member 720 relative to the first member 710. 723b is formed with an angle of 40 ° or less with respect to a straight line orthogonal to the axis of the second member 720.

上記第１部材７１０と第２部材７２０とは、図５に示すように、第１部材７１０の対向壁７１３に設けた連結孔７１３ａに通したねじ７３０を第２部材７２０の対向壁７２３のねじ穴７２３ａにねじ込むことにより、相互に連結される。このとき、伝動軸３００は、第１部材７１０の内孔７１１ｃ、第２部材７２０の一対の対向壁７２３の間、ないし第２部材７２０の内孔７２２ａを連通挿しており、このようにして、この第２の関節部材７００を貫通させられている。なお、上記ねじ７３０は、その頭部７３１の首下部に第１部材７１０の対向壁７１３の厚みよりやや長い支軸部７３２を有していることにより、第２部材７２０は、第１部材７１０に対し、上記ねじ７３０の軸線を中心として回動自由となる。上記したように、第２部材７２０の対向壁７２３の先端には、規制面７２３ｂが形成されているので、第２部材７２０は、第１部材７１０に対し、第１部材７１０の軸線方向を中心として、片側４０°以内、両側８０°以内の角度範囲内を回動しうる。これにより、可撓管５００は、エンジン２００の出力軸２２１に対し、片側４０°以内、両側８０度以内で自由に屈曲しうると同時に、この屈曲状態において、エンジン２００の出力軸２２１を中心として、自由旋回しうるようになる。 As shown in FIG. 5, the first member 710 and the second member 720 include a screw 730 passed through a connecting hole 713 a provided in the opposing wall 713 of the first member 710 and a screw of the opposing wall 723 of the second member 720. They are connected to each other by screwing into the holes 723a. At this time, the transmission shaft 300 is inserted through the inner hole 711c of the first member 710, the pair of opposing walls 723 of the second member 720, or the inner hole 722a of the second member 720. The second joint member 700 is penetrated. Note that the screw 730 has a support shaft portion 732 that is slightly longer than the thickness of the opposing wall 713 of the first member 710 at the lower neck portion of the head portion 731, so that the second member 720 is the first member 710. On the other hand, it is freely rotatable around the axis of the screw 730. As described above, since the regulation surface 723 b is formed at the tip of the opposing wall 723 of the second member 720, the second member 720 is centered about the axial direction of the first member 710 with respect to the first member 710. Can be rotated within an angle range of 40 ° on one side and 80 ° on both sides. Thereby, the flexible tube 500 can be freely bent with respect to the output shaft 221 of the engine 200 within 40 ° on one side and within 80 ° on both sides. At the same time, the flexible tube 500 is centered on the output shaft 221 of the engine 200 in this bent state. , You can turn freely.

次に、上記構成の携帯式作業機１００の作用について説明する。 Next, the operation of the portable work machine 100 configured as described above will be described.

刈払い作業において、作業者は、背負い枠２２を背負った状態で、グリップハンドル４５０を把持しつつ、操作管４００を支持し、エンジン２００の回転数を上げて操作管４００を左右に振回することによって、回転刃４１０を地面に沿って左右に往復移動させながら前進してゆく。スロットルレバー（図示略）を操作することによってエンジン２００の回転数を制御することができ、エンジン２００の回転数が所定以上となるとクランクチハウジング２１０内のクラッチが作動してエンジン２００の出力が出力軸２２１に伝達され、この出力軸２２１の回転が上記した可撓性の伝動軸３００を軸転させて操作管４００の先端の回転刃４１０を回転させる。 In the mowing work, the operator supports the operation tube 400 while holding the grip handle 450 while carrying the backpack 22 and swings the operation tube 400 left and right by increasing the rotation speed of the engine 200. Accordingly, the rotary blade 410 moves forward while reciprocating left and right along the ground. By operating a throttle lever (not shown), the rotational speed of the engine 200 can be controlled. When the rotational speed of the engine 200 exceeds a predetermined value, the clutch in the crank housing 210 is activated and the output of the engine 200 is output. The rotation of the output shaft 221 is transmitted to the shaft 221, and the flexible transmission shaft 300 is rotated to rotate the rotary blade 410 at the tip of the operation tube 400.

操作管４００は、概ね、作業者の右側を前後方向に延びるように位置するから、可撓管５００は、操作管４００の後端から、大きく湾曲しながら作業者の背中に位置するエンジン２００に至る。操作管４００と可撓管５００との間の第１の関節部材６００は、操作管４００と可撓管５００とを垂直軸線周りに相互回動させるから、操作管４００を左右に振回させる際に、可撓管５００の撓み量が大きく変化することなく上記第１の関節部材６００が屈曲する。したがって、操作管４００の左右の振回操作に無駄な抵抗がなく、その操作に軽快さが増す。また、第１の関節部材６００においては、上記したように、操作管４００に対する可撓管５００の屈曲可能範囲が制限されているから、伝動軸３００が必要以上に屈曲させられることがない。したがって、伝動軸３００の軸転に無駄な抵抗が生じることがなく、エンジン２００の出力低下を抑制することができる。しかも、上記の実施形態では、第１の関節部材６００における第１部材６１０および第２部材６２０の各連絡部６１２，６２２の内孔６１２ａ，６２２ａは上記したように水平方向に拡がるテーパ状となっているから、第１の関節部材６００の屈曲状態において、軸転する伝動軸３００が第１部材６１０および第２部材６２０の内孔６１２ａ，６２２ａに強く接触することを回避することができる。したがって、伝動軸３００が第１の関節部材６００に接触することによる摩擦熱の発生や、出力低下を抑制することができる。 Since the operation tube 400 is generally positioned so as to extend in the front-rear direction on the right side of the operator, the flexible tube 500 extends from the rear end of the operation tube 400 to the engine 200 positioned on the operator's back while being largely curved. It reaches. Since the first joint member 600 between the operation tube 400 and the flexible tube 500 causes the operation tube 400 and the flexible tube 500 to rotate around the vertical axis, the operation tube 400 is swung left and right. In addition, the first joint member 600 bends without greatly changing the amount of bending of the flexible tube 500. Therefore, there is no useless resistance to the left and right swinging operation of the operation tube 400, and the operation is lighter. Further, in the first joint member 600, as described above, the bendable range of the flexible tube 500 with respect to the operation tube 400 is limited. Therefore, the transmission shaft 300 is not bent more than necessary. Therefore, useless resistance is not generated in the rotation of the transmission shaft 300, and the output reduction of the engine 200 can be suppressed. Moreover, in the above-described embodiment, the inner holes 612a and 622a of the connecting portions 612 and 622 of the first member 610 and the second member 620 of the first joint member 600 are tapered so as to expand in the horizontal direction as described above. Therefore, in the bent state of the first joint member 600, it is possible to avoid that the transmission shaft 300 that rotates is strongly in contact with the inner holes 612a and 622a of the first member 610 and the second member 620. Therefore, generation of frictional heat and a decrease in output due to the transmission shaft 300 coming into contact with the first joint member 600 can be suppressed.

しかも、操作管４００に対して可撓管５００が自重によって大きく屈曲するようにして垂れ下がることがないので、作業中、可撓管５００が操作管４００の基端から垂れ下がった状態でぶらぶら揺れるといったこともなく、このことによっても、操作管４００の左右振回操作を軽快に行うことができるようになる。 In addition, since the flexible tube 500 does not hang down so as to be greatly bent by its own weight with respect to the operation tube 400, the flexible tube 500 sways while hanging from the base end of the operation tube 400 during work. This also makes it possible to lightly perform the left / right swinging operation of the operation tube 400.

さらには、可撓管５００とエンジン２００との間の第２の関節部材７００は、エンジン２００の出力軸２２１に対して可撓管５００を所定の範囲内で屈曲させることができ、しかも、この屈曲状態でエンジン２００の出力軸２２１を中心として旋回することができるので、操作管４００の左右振回操作によって、可撓管５００に軸方向の往復移動があっても、可撓管５００の撓み量を大きく変化させずに上記の往復移動を吸収することができる。このことによっても、可撓管５００の撓み量が大きく変化することによるエンジン２００の出力低下を抑制することができるし、また、操作管４００の左右振回操作の軽快さを維持することができる。しかも、上記の実施形態では、第２の関節部材７００における第１部材７１０および第２部材７２０の筒部７１１，連絡部７２２の内孔７１１ｃ，７２２ａは上記したようにテーパ状となっているから、第２の関節部材７００の屈曲状態において、軸転する伝動軸３００が第１部材７１０および第２部材７２０の内孔７１１ｃ，７２２ａに強く接触することを回避することができる。したがって、伝動軸３００が第２の関節部材７００に接触することによる摩擦熱の発生や、出力低下を抑制することができる。 Further, the second joint member 700 between the flexible tube 500 and the engine 200 can bend the flexible tube 500 within a predetermined range with respect to the output shaft 221 of the engine 200, and this Since it can turn around the output shaft 221 of the engine 200 in a bent state, even if the flexible tube 500 is reciprocated in the axial direction by the left and right swinging operation of the operation tube 400, the flexible tube 500 is bent. The above-described reciprocating movement can be absorbed without greatly changing the amount. Also by this, it is possible to suppress a decrease in the output of the engine 200 due to a large change in the amount of bending of the flexible tube 500, and it is possible to maintain the lightness of the left and right swinging operation of the operation tube 400. . In addition, in the above-described embodiment, the first member 710 in the second joint member 700 and the cylindrical portion 711 of the second member 720 and the inner holes 711c and 722a of the connecting portion 722 are tapered as described above. In the bent state of the second joint member 700, it is possible to avoid the pivoting transmission shaft 300 from coming into strong contact with the inner holes 711c and 722a of the first member 710 and the second member 720. Therefore, it is possible to suppress the generation of frictional heat and the decrease in output due to the transmission shaft 300 coming into contact with the second joint member 700.

以上の結果、上記構成の携帯式作業機１００は、操作管４００を左右に振回して行う作業をより軽快に行うことができ、しかも、エンジン２００の出力低下や、関節部材における摩擦熱の発生を抑制して、長寿命化を図ることができる。 As a result, the portable work machine 100 configured as described above can more easily perform the work performed by swinging the operation tube 400 to the left and right, and the output of the engine 200 is reduced and the frictional heat is generated in the joint member. It is possible to extend the life by suppressing the above.

さらには、伝動軸３００の各関節部材６００，７００への必要以上に大きな圧力での接触や、可撓管５００の必要以上の撓みを防止してエンジン２００の出力低下を抑制することができることは、エンジン２００をより小出力の小型のものを採用できることにつながる。このことは、携帯式作業機１００のさらなる軽量化に寄与し、操作性の向上につながる。 Furthermore, it is possible to prevent the output reduction of the engine 200 by preventing the contact of the transmission shaft 300 to the joint members 600 and 700 with an unnecessarily large pressure and the bending of the flexible tube 500 more than necessary. As a result, a smaller engine 200 having a smaller output can be adopted. This contributes to further weight reduction of the portable work machine 100 and leads to improvement in operability.

もちろん、この発明の範囲は上述した実施形態に限定されることはなく、各請求項に記載した事項の範囲内でのあらゆる変更は、すべて本願発明の範囲に含まれる。 Of course, the scope of the present invention is not limited to the above-described embodiments, and all modifications within the scope of the matters described in each claim are included in the scope of the present invention.

実施形態では、背負い枠２２に搭載されるエンジン２００は、その出力軸２２１が横方向に延びるようにして搭載しているが、出力軸２２１を上方に向けて搭載してもよい。また、各関節部材６００，７００の具体的構成についても、実施形態のものに限定されず、種々の変更が可能である。なお、各関節部材６００，７００は、たとえば、ジャバラ状のカバーによって、内部を覆い隠すのが望ましい。また、実施形態では、伝動軸３００はその全長が可撓性を有しているが、少なくとも、第１の関節部材６００、可撓管５００ないし第２の関節部材７００に通挿される部分が可撓部となっておればよい。 In the embodiment, the engine 200 mounted on the back frame 22 is mounted such that the output shaft 221 extends in the lateral direction, but the output shaft 221 may be mounted upward. Further, the specific configuration of each joint member 600, 700 is not limited to that of the embodiment, and various changes can be made. In addition, as for each joint member 600,700, it is desirable to cover the inside with a bellows-like cover, for example. In the embodiment, the entire length of the transmission shaft 300 is flexible. However, at least a portion inserted through the first joint member 600 and the flexible tube 500 or the second joint member 700 is possible. What is necessary is just to be a bending part.

本願発明に係る携帯式作業機の一例を示す概略斜視図である。It is a schematic perspective view which shows an example of the portable working machine which concerns on this invention. 図１のＩＩ−ＩＩ線に沿う断面図である。It is sectional drawing which follows the II-II line | wire of FIG. 図１のＩＩＩ−ＩＩＩ線に沿う断面図である。It is sectional drawing which follows the III-III line of FIG. 図３のＩＶ−ＩＶ線に沿う断面図である。It is sectional drawing which follows the IV-IV line of FIG. 図１のＶ−Ｖ線に沿う断面図である。It is sectional drawing which follows the VV line of FIG. 図５のＶＩ−ＶＩ線に沿う断面図である。It is sectional drawing which follows the VI-VI line of FIG.

符号の説明Explanation of symbols

２２背負い枠
１００携帯式作業機
２００エンジン（動力源）
２１０クラッチハウジング
２２１出力軸
３００伝動軸
４００操作管
４１０回転刃
５００可撓管
６００第１の関節部材
６１０第１部材（第１の関節部材の）
６１３対向壁
６２０第２部材（第１の関節部材の）
６２３対向壁
７００第２の関節部材
７１０第１部材（第２の関節部材の）
７１３対向壁
７２０第２部材（第２の関節部材の） 22 Back frame 100 Portable work machine 200 Engine (power source)
210 Clutch housing 221 Output shaft 300 Transmission shaft 400 Operation tube 410 Rotary blade 500 Flexible tube 600 First joint member 610 First member (of the first joint member)
613 Opposing wall 620 Second member (of the first joint member)
623 Opposite wall 700 Second joint member 710 First member (second joint member)
713 opposing wall 720 second member (second joint member)

Claims

操作管と、この操作管の先端に支持させた回転作業体と、この操作管の基端に可撓管を介して連結され、かつ背負い枠に支持された動力源と、上記可撓管ないし操作管の内部に通挿され、上記動力源の回転出力を上記回転作業体に伝達する伝動軸とを備えた携帯式作業機において、
上記操作管と上記可撓管との間には、略垂直状に延び、かつ上記操作管に対して固定状の軸を中心として屈曲可能な第１の関節部材が介装されおり、かつ、上記伝動軸は、少なくとも上記可撓管に通挿される部分が可撓部とされているとともに、この可撓部が上記第１の関節部材を貫通させられていることを特徴とする、携帯式作業機。 An operating tube, a rotating work body supported at the distal end of the operating tube, a power source connected to the proximal end of the operating tube via a flexible tube and supported by a back frame, the flexible tube or In a portable work machine having a transmission shaft that is inserted into the operation tube and transmits the rotational output of the power source to the rotating work body,
Between the operation tube and the flexible tube, a first joint member extending in a substantially vertical shape and bendable about a fixed axis with respect to the operation tube is interposed, and The power transmission shaft has at least a portion inserted into the flexible tube as a flexible portion, and the flexible portion is allowed to penetrate the first joint member. Work machine.

上記第１の関節部材は、上記操作管側に位置する第１部材と、上記可撓管側に位置する第２部材とを有しており、上記第１部材は上記操作管に固定状に連結されているとともに、上記第２部材は、上記第１部材に対して上記固定状の軸を中心として回動可能に連結されている、請求項１に記載の携帯式作業機。 The first joint member includes a first member located on the operation tube side and a second member located on the flexible tube side, and the first member is fixed to the operation tube. The portable work machine according to claim 1, wherein the second member is connected to the first member so as to be rotatable about the fixed shaft.

上記第１の関節部材の上記第１部材は、上記操作管に連結される筒部と、この筒部から二股ホーク状に延びる一対の対向壁とを有する一方、上記第１の関節部材の上記第２部材は、上記可撓管に連結される筒部と、この筒部から二股ホーク状に延び、上記第１部材の上記一対の対向壁の内側または外側に隣接して位置する一対の対向壁と、内外に隣接する対向壁どうしを相互回動可能に連結して上記第１部材と上記第２部材間を連結し、かつ、上記固定状の軸を構成する連結軸とを備えており、上記伝動軸は、上記一対の対向壁間を貫通している、請求項２に記載の携帯式作業機。 The first member of the first joint member has a cylindrical portion connected to the operation tube and a pair of opposing walls extending in a bifurcated fork form from the cylindrical portion, while the first joint member has the pair of opposing walls. The second member includes a cylindrical portion connected to the flexible tube, and a pair of opposing ends extending from the cylindrical portion in a bifurcated fork shape and positioned adjacent to the inside or the outside of the pair of opposing walls of the first member. And a connecting shaft that connects the first member and the second member by connecting the opposing walls adjacent to each other inside and outside in a mutually rotatable manner, and that constitutes the fixed shaft. The portable work machine according to claim 2, wherein the transmission shaft penetrates between the pair of opposed walls.

上記第１の関節部材の上記第１部材の上記筒部、および上記第２部材の上記筒部には、相手部材に向かうにつれて拡開し、上記伝動軸を内包するテーパ孔が形成されている、請求項３に記載の携帯式作業機。 The cylindrical portion of the first member of the first joint member and the cylindrical portion of the second member are formed with tapered holes that expand toward the mating member and contain the transmission shaft. The portable work machine according to claim 3.

上記第１の関節部材は、上記第１部材に対する上記第２部材の上記固定状の軸を中心とした回動範囲を規制する規制手段が設けられており、この規制手段は、上記第１部材に対し、上記第２部材が、上記第１部材の軸線を挟んで片側３０〜４０°、両側６０〜８０°の範囲で回動しうるように構成されている、請求項２ないし４のいずれかに記載の携帯式作業機。 The first joint member is provided with a restricting means for restricting a rotation range around the fixed shaft of the second member with respect to the first member, and the restricting means includes the first member. In contrast, any one of claims 2 to 4, wherein the second member is configured to be rotatable in a range of 30 to 40 ° on one side and 60 to 80 ° on both sides across the axis of the first member. The portable work machine according to Crab.

上記可撓管と上記動力源との間には、上記動力源の出力軸の軸線と直交し、上記出力軸周りに自由に旋回可能な軸を中心として屈曲可能な第２の関節部材が介装されており、かつ、上記伝動軸の可撓部が上記第２の関節部材を貫通させられている、請求項１ないし５のいずれかに記載の携帯式作業機。 Between the flexible tube and the power source, there is a second joint member that is orthogonal to the axis of the output shaft of the power source and can be bent around an axis that can freely turn around the output shaft. The portable work machine according to any one of claims 1 to 5, wherein the portable work machine is mounted and a flexible portion of the transmission shaft is passed through the second joint member.

上記第２の関節部材は、上記動力源側に位置する第１部材と、上記可撓管側に位置する第２部材とを有しており、上記第１部材は上記動力源に対してその出力軸の軸線周りに軸転可能に連結されているとともに、上記第２部材は、上記第１部材に対して上記第１部材の軸線に直交する軸を中心として回動可能に連結されている、請求項６に記載の携帯式作業機。 The second joint member has a first member located on the power source side and a second member located on the flexible tube side, and the first member is located with respect to the power source. The second member is coupled to be rotatable about an axis of the output shaft, and the second member is coupled to the first member so as to be rotatable about an axis orthogonal to the axis of the first member. The portable work machine according to claim 6.

上記第２の関節部材の上記第１部材は、上記動力源に軸転可能に連結される筒部と、この筒部から二股ホーク状に延びる一対の対向壁とを有する一方、上記第２の関節部材の上記第２部材は、上記可撓管に連結される筒部と、この筒部から二股ホーク状に延び、上記第１部材の上記一対の対向壁の内側または外側に隣接して位置する一対の対向壁と、内外に隣接する対向壁どうしを相互回動可能に連結して上記第１の部材と上記第２の部材間を連結し、かつ、上記軸を構成する連結軸とを備えており、上記伝動軸は、上記一対の対向壁間を貫通している、請求項７に記載の携帯式作業機。 The first member of the second joint member includes a cylindrical portion that is rotatably connected to the power source, and a pair of opposing walls that extend in a bifurcated fork form from the cylindrical portion. The second member of the joint member is positioned adjacent to an inner side or an outer side of the pair of opposing walls of the first member, and a cylindrical portion connected to the flexible tube and extending from the cylindrical portion into a forked fork. A pair of opposing walls that are connected to each other so that the opposing walls adjacent to each other inside and outside are connected to each other so as to connect the first member and the second member, and a connecting shaft that constitutes the shaft. The portable work machine according to claim 7, further comprising: the transmission shaft penetrating between the pair of opposed walls.

上記第２の関節部材の上記第１部材の上記筒部、および上記第２部材の上記筒部には、相手部材に向かうにつれて拡開し、上記伝動軸を内包するテーパ孔が形成されている、請求項８に記載の携帯式作業機。 The cylindrical portion of the first member of the second joint member and the cylindrical portion of the second member are formed with tapered holes that expand toward the mating member and contain the transmission shaft. The portable work machine according to claim 8.

上記第２の関節部材は、上記第１部材に対する上記第２部材の上記軸を中心とした回動範囲を規制する規制手段が設けられており、この規制手段は、上記第１部材に対し、上記第２部材が、上記第１部材の軸線を挟んで片側３０〜４０°、両側６０〜８０°の範囲で回動しうるように構成されている、請求項７ないし９のいずれかに記載の携帯式作業機。 The second joint member is provided with a restricting means for restricting a rotation range around the axis of the second member with respect to the first member, and the restricting means is provided with respect to the first member. The said 2nd member is comprised so that it can rotate in the range of one side 30-40 degrees and both sides 60-80 degrees on both sides of the axis line of the said 1st member. Portable work machine.