JP7511905B2

JP7511905B2 - Grass cutting equipment

Info

Publication number: JP7511905B2
Application number: JP2021023469A
Authority: JP
Inventors: 太秋中村; 修一天間
Original assignee: 株式会社ササキコーポレーション
Priority date: 2021-02-17
Filing date: 2021-02-17
Publication date: 2024-07-08
Anticipated expiration: 2041-02-17
Also published as: JP2022125723A; JP7685279B2; JP2024107493A

Description

この発明は草刈装置に関する。 This invention relates to a grass cutting device.

支柱等の障害物の近傍周囲を刈る装置として、例えば、特許文献１記載発明がある。この発明は、作業部が走行機体に対して進行方向の左右側方に突出する構成で、作業部が障害物に衝突したら、後方に揺動して回避するものである。
また、ガードレールの支柱等の障害物の近傍に生えた草を刈る草刈装置の例として、特許文献２に記載の発明がある。この発明は、２つの作業部であるカッターヘッドを障害物の両側に位置させて草刈り作業をすることができる草刈り機である。この草刈機はトラクターのフレームに取付けて、ガードレール等の両側を草刈りするために使用されるもので、本体フレームには前後動、上下動及び回動可能に２本のアームが取付けられている。このアームの先端部の夫々にカッターヘッドを取り付けている。 For example, Patent Document 1 discloses an invention for a device for mowing the vicinity of obstacles such as posts. In this invention, the working unit protrudes to the left and right of the traveling body in the direction of travel, and if the working unit collides with an obstacle, it swings backwards to avoid it.
Also, an example of a grass cutting device that cuts grass growing near obstacles such as guardrail posts is disclosed in the invention described in Patent Document 2. This invention is a grass cutter that can perform grass cutting work by positioning two working parts, cutter heads, on both sides of the obstacle. This grass cutter is attached to the frame of a tractor and used to cut grass on both sides of a guardrail or the like, and two arms are attached to the main frame so that they can move back and forth, up and down, and rotate. A cutter head is attached to each tip of the arms.

特開２００２－３１５４１７号公報JP 2002-315417 A 米国公開特許２００５／００００２０２公報U.S. Patent Publication 2005/0000202

特許文献１に記載の発明は、片側一方に向けて作業部が突出しているので、走行機体に対して障害物の陰になっている部分は刈ることができない課題を有する。障害物の全周囲を刈るためには往復作業が必要となる。
しかし、前述の走行機体に対して障害物の陰になっている部分が、走行不可能な場合も存在し、特許文献１の発明では対応できない場所も存在する。この場合、特許文献２に記載の発明を活用することも考えられる。 The invention described in Patent Document 1 has a problem in that the working part protrudes to one side, so the part of the obstacle that is in the shadow of the traveling body cannot be mowed. In order to mow the entire perimeter of the obstacle, back and forth work is required.
However, there are cases where the above-mentioned traveling machine body cannot travel due to an obstacle being in its shadow, and there are also places that cannot be handled by the invention of Patent Document 1. In such cases, it is possible to utilize the invention described in Patent Document 2.

特許文献２の発明は、２つの作業部をそれぞれ支持するために、２つのアームを配置する必要が生じる。このため、構造が複雑になるとともに、走行機体の側方に突出して位置する２つの作業部及び２つのアームによって、作業部を取り付けた走行機体のバランスが悪化し走行機体の走行に支障が生じる課題を有する。
また、走行機体のバランスを解決するためには、大型の走行機体を用意する必要もあり、使用者にとっては経済的に負担を強いている。 The invention of Patent Document 2 requires the placement of two arms to support the two working units, respectively, which results in a complex structure, and the two working units and two arms protruding from the sides of the traveling body cause problems such as poor balance of the traveling body to which the working units are attached, causing problems with the traveling body's movement.
Furthermore, in order to solve the problem of the balance of the traveling machine body, it is necessary to prepare a large traveling machine body, which imposes a financial burden on the user.

この発明は、
走行機体に取り付けて走行される作業部と、
作業部に取り付ける作業アームと、
走行機体側に設けるフレームに、作業アームの一端を回動自在に取り付けることで、作業部をフレームに回転自在に取り付ける支点軸と、
支点軸に取り付けるとともに、支点軸への取り付け箇所より広がりを有する幅広状からなる切換片と、
フレーム側に設け、作業アームと接触して作業アームの移動を規制する回動規制体と、
切換片の幅広状部分に設け、回動規制体をガイドする規制部と、
作業アームの、支点軸との取り付け箇所とは他端寄りに設けるガイドロッド保持部と、
切換片の幅広状部分の規制部を設けた個所とは異なる箇所に設けるガイドロッド支点部と、
一端はガイドロッド支点部に回動自在に取り付け、他端はガイドロッド保持部と摺動可能に取り付けるガイドロッドと、
ガイドロッドのガイドロッド支点部とガイドロッド保持部の間に設置し、その間で付勢する付勢体とを有する、草刈装置において、
前記支点軸に回動自在に取り付ける前記切換片に一方側を回動可能に取付けるとともに、回動によって他方側が前記支点軸を通る進行方向と平行な線を境にした領域である第１領域及び第２領域とに移動可能な前記作業アームと、
前記切換片の支点軸近傍に配置し、前記作業アームに接触することによって前記作業アームの回動を規制する前記回動規制体と、
前記作業アームを前記第１領域あるいは前記第２領域のいずれか一方に突出させるとともに、前記作業アームを前記第１領域あるいは前記第２領域のいずれか一方に付勢する前記付勢体と、
を備えたことを特徴とする草刈装置、
に係る。 The present invention relates to
A working unit that is attached to the traveling body and travels;
A working arm attached to the working unit;
A fulcrum shaft for rotatably mounting the working unit to the frame by rotatably mounting one end of the working arm to the frame provided on the traveling machine body side;
A switching piece that is attached to the fulcrum shaft and has a wide shape that spreads from the attachment point to the fulcrum shaft;
a rotation restricting body provided on the frame side and contacting the working arm to restrict movement of the working arm;
a restricting portion provided on the wide portion of the switching piece and configured to guide the rotation restricting body;
a guide rod holding portion provided on the working arm toward the other end of the working arm from the attachment point of the fulcrum shaft;
a guide rod fulcrum portion provided at a position different from the position where the restriction portion of the wide portion of the switching piece is provided;
a guide rod having one end rotatably attached to the guide rod fulcrum portion and the other end slidably attached to the guide rod holding portion;
A grass cutting device having a biasing body that is installed between a guide rod fulcrum portion of a guide rod and a guide rod holding portion and biases the guide rod fulcrum portion and the guide rod holding portion,
the working arm having one side rotatably attached to the switching piece which is rotatably attached to the fulcrum shaft, and the other side of which is movable by rotation between a first region and a second region which are regions bounded by a line passing through the fulcrum shaft and parallel to the direction of travel;
a rotation restricting body that is disposed near a fulcrum axis of the switching piece and restricts rotation of the working arm by contacting the working arm;
a biasing body that projects the working arm into either the first region or the second region and biases the working arm toward either the first region or the second region;
A grass cutting device comprising:
relates to.

この発明は、更に、
前記切換片に前記支点軸を回動中心として回動可能に設けるととともに、前記回動規制体に接触して回動を規制可能な規制部を有する切換片と、を備え、
前記規制部は、前記切換片が前記第１領域側に回動する方向である第１回動方向への回動を規制する第１規制部と、
前記切換片が前記第２領域側に回動する方向である第２回動方向への回動を規制する第２規制部と、
をさらに備えたことを特徴とする草刈装置、
に係る。 The present invention further comprises:
a switching piece provided on the switching piece so as to be rotatable about the fulcrum shaft as a rotation center, and having a restricting portion capable of restricting rotation by contacting the rotation restricting body,
The restricting portion includes a first restricting portion that restricts rotation of the switching piece in a first rotation direction, which is a direction in which the switching piece rotates toward the first region;
a second restriction portion that restricts rotation of the switching piece in a second rotation direction, which is a direction in which the switching piece rotates toward the second region;
A grass cutting device further comprising:
relates to.

この発明は、更に、
前記第１領域側に位置する前記作業アームを前記付勢体の付勢力に抗して、第１領域側から前記第２領域側に外力を加えると、前記作業アームの位置は第２領域側に位置するように切り換わり、
前記第２領域側に位置する前記作業アームを前記付勢体の付勢力に抗して、第２領域側から第１領域側に外力を加えると、前記作業アームの位置は第１領域側に位置するように切り換わる、
ことを特徴とする草刈装置、
に係る。 The present invention further comprises:
When an external force is applied from the first region side to the second region side against the biasing force of the biasing body, the position of the working arm is switched to be located on the second region side,
When an external force is applied from the second area side to the first area side against the biasing force of the biasing body, the position of the working arm is switched to be located on the first area side.
A grass cutting device,
relates to.

この発明は、更に、
前記第１領域側に位置する前記作業アームを前記第２領域側に移動させると、前記回動規制体が第１規制部に接触して前記切換片の前記第１回動方向への回動を規制し、
前記第２領域側に位置する前記作業アームを前記第１領域側に移動させると、前記回動規制体が第２規制部に接触して前記切換片の前記第２回動方向への回動を規制する、
ことを特徴とする草刈装置、
に係る。 The present invention further comprises:
When the working arm positioned on the first region side is moved to the second region side, the rotation restricting body comes into contact with the first restricting portion to restrict the rotation of the switching piece in the first rotation direction,
When the working arm located on the second region side is moved toward the first region side, the rotation restricting body comes into contact with the second restricting portion to restrict the rotation of the switching piece in the second rotation direction.
A grass cutting device,
relates to.

この発明は、更に、
前記支点軸は、走行機体に装着した機枠及び伸縮手段の先端部に設ける、
ことを特徴とする草刈装置、
に係る。 The present invention further comprises:
The fulcrum shaft is provided at the tip of the machine frame and the telescopic means attached to the traveling machine body.
A grass cutting device,
relates to.

この発明は、更に、
切換片は、扇状からなり、扇状の頂点に支点軸を取り付け、ガイドロッド支点部と規制部を扇状の異なる両端部付近にそれぞれ設ける、
草刈装置、
に係る。 The present invention further comprises:
The switching piece is fan-shaped, a fulcrum shaft is attached to the apex of the fan, and a guide rod fulcrum portion and a regulating portion are provided near different ends of the fan, respectively.
Grass cutting equipment,
Pertaining to.

この発明は、更に、
規制部は、切換片の幅広状の一方端寄りに長孔状に設け、回動規制体をガイドするとともに、長孔状の両端部に切換片が第１領域側に回動する方向である第１回動方向への回動を規制する第１規制部と切換片が第２領域側に回動する方向である第２回動方向への回動を規制する第２規制部とをそれぞれ設ける、
草刈装置、
に係る。 The present invention further comprises:
the restricting portion is provided in the shape of a long hole near one wide end of the switching piece to guide the rotation restricting body, and a first restricting portion that restricts rotation in a first rotation direction in which the switching piece rotates towards the first region and a second restricting portion that restricts rotation in a second rotation direction in which the switching piece rotates towards the second region are provided at both ends of the long hole, respectively;
Grass cutting equipment,
relates to.

この発明は、更に、
切換片の幅広状部分の規制部を設けた個所とは異なる端部に設け、ガイドロッドの先端を取り付けるガイドロッド支点部と、を設ける、
草刈装置、
に係る。 The present invention further comprises:
a guide rod fulcrum portion provided at an end portion of the wide portion of the switching piece different from the end portion where the regulating portion is provided, and to which a tip end of the guide rod is attached;
Grass cutting equipment,
relates to.

この発明は、簡易な構成で障害物の周囲で作業ができる草刈装置を提供する。 This invention provides a grass cutting device that can work around obstacles with a simple configuration.

この発明の実施例に係る草刈装置の正面図である。作業アームが、第１領域での復帰位置のときを示す。Fig. 2 is a front view of the grass cutting device according to the embodiment of the present invention, showing the working arm in a return position in the first region. この発明の実施例に係る草刈装置の側面図である。作業アームが、第１領域での復帰位置のときを示す。Fig. 2 is a side view of the grass cutting device according to the embodiment of the present invention, showing the working arm in a return position in a first region. この発明の実施例に係る草刈装置の平面図である。作業アームが、第１領域での復帰位置のときを示す。Fig. 2 is a plan view of the grass cutting device according to the embodiment of the present invention, showing the working arm in a return position in the first region. この発明の実施例に係る草刈装置の動作を示す平面図である。作業部を一方側である第１領域から他方側である第２領域へ切り換える様子を示した図である。図中左側が進行方向前方である。It is a top view showing the operation of the grass mowing device according to the embodiment of the present invention, and is a view showing the state in which the working unit is switched from a first region on one side to a second region on the other side. In the drawing, the left side is the front in the traveling direction. この発明の実施例に係る草刈装置の動作を示す平面図である。作業部を一方側である第１領域から他方側である第２領域へ切り換える様子を示した図である。図中左側が進行方向前方である。It is a top view showing the operation of the grass mowing device according to the embodiment of the present invention, and is a view showing the state in which the working unit is switched from a first region on one side to a second region on the other side. この発明の実施例に係る草刈装置の動作を示す平面図である。作業部を一方側である第１領域から他方側である第２領域へ切り換える様子を示した図である。図中左側が進行方向前方である。It is a top view showing the operation of the grass mowing device according to the embodiment of the present invention, and is a view showing the state in which the working unit is switched from a first region on one side to a second region on the other side. この発明の実施例に係る草刈装置の動作を示す平面図である。作業部を他方側である第２領域から一方側である第１領域へ切り換える様子を示した図である。図中左側が進行方向前方である。It is a top view showing the operation of the grass mowing device according to the embodiment of the present invention, and is a view showing the state in which the working unit is switched from the second area on the other side to the first area on the one side. In the drawing, the left side is the front in the traveling direction. この発明の実施例に係る草刈装置の動作を示す平面図である。作業部を他方側である第２領域から一方側である第１領域へ切り換える様子を示した図である。図中左側が進行方向前方である。It is a top view showing the operation of the grass mowing device according to the embodiment of the present invention, and is a view showing the state in which the working unit is switched from the second area on the other side to the first area on the one side. In the drawing, the left side is the front in the traveling direction. この発明の実施例に係る草刈装置の動作を示す平面図である。作業部を他方側である第２領域から一方側である第１領域へ切り換える様子を示した図である。図中左側が進行方向前方である。It is a plan view showing the operation of the grass mowing device according to the embodiment of the present invention. It is a view showing the state where the working unit is switched from the second area on the other side to the first area on one side. In the drawing, the left side is the front in the traveling direction. この発明の実施例に係る草刈装置の平面図である。走行機体及び伸縮手段に取り付けた例を示す。障害物である支柱Ｄ２が第１領域Ｓ１にある場合を示す。It is a top view of the grass cutting device according to the embodiment of the present invention, and shows an example of attachment to a traveling machine body and an extension means. It shows a case where a post D2, which is an obstacle, is in a first area S1. この発明の実施例に係る草刈装置の背面図である。走行機体及び伸縮手段に取り付けた例を示す。障害物である支柱が第１領域にある場合を示す。It is a rear view of the grass cutting device according to the embodiment of the present invention. It shows an example in which the traveling machine body and the telescopic means are attached. It shows the case where the post which is an obstacle is in the first area. この発明の実施例に係る草刈装置の平面図である。走行機体及び伸縮手段に取り付けた例を示す。障害物である支柱が第２領域にある場合を示す。It is a top view of the grass cutting device according to the embodiment of the present invention, and shows an example in which the traveling machine body and the telescopic means are attached. It shows the case where the post, which is an obstacle, is in the second area. この発明の実施例に係る草刈装置の背面図である。走行機体及び伸縮手段に取り付けた例を示す。障害物である支柱が第２領域にある場合を示す。It is a rear view of the grass cutting device according to the embodiment of the present invention. It shows an example in which the traveling machine body and the telescopic means are attached. It shows the case where the post which is an obstacle is in the second area. この発明の実施例に係る草刈装置の背面図である。走行機体及び伸縮手段に取り付けた例を示す。伸縮手段の先端部に設けた水平軸で草刈装置を、第１領域側を上方に向けて回動させ、外力である作業部の自重によって、作業部を第１領域から第２領域に回動させた様子を示す。1 is a rear view of a grass cutting device according to an embodiment of the present invention, showing an example of attachment to a traveling body and an extension means, and showing a state in which the grass cutting device is rotated with the first region side facing upward by a horizontal shaft provided at the tip of the extension means, and the working unit is rotated from the first region to the second region by the weight of the working unit, which is an external force. この発明の実施例に係る草刈装置の側面図である。車輪ユニットの作用をあらわす図である。It is a side view of the grass cutting device according to the embodiment of the present invention. この発明の実施例に係る草刈装置の側面図である。車輪ユニットの作用をあらわす図である。It is a side view of the grass cutting device according to the embodiment of the present invention.

この発明の実施例に係る草刈装置について図面にしたがって説明する。
Ａは、走行機体である。走行機体Ａは、トラクターからなる。走行機体Ａは、走行機体Ａ及び伸縮手段Ｃに取り付けた例を示す平面図である図１０、草刈装置Ｅの背面図であって、草刈装置Ｅを走行機体Ａ及び伸縮手段Ｃに取り付けた例を示し、障害物である支柱Ｄ２が第１領域Ｓ１にある場合を示す図１１、草刈装置Ｅの平面図であって、草刈装置Ｅを走行機体Ａ及び伸縮手段Ｃに取り付けた例を示す障害物である支柱Ｄ２が第２領域Ｓ２にある場合を示す図１２、草刈装置Ｅの背面図であって、草刈装置Ｅを走行機体Ａ及び伸縮手段Ｃに取り付けた例を示す。障害物である支柱が第２領域Ｓ２にある場合を示す図１３、草刈装置Ｅの背面図であって、草刈装置Ｅを走行機体Ａ及び伸縮手段Ｃに取り付けた例を示す、伸縮手段Ｃの先端部に設けた水平軸で草刈装置Ｅを、第１領域側Ｓ１を上方に向けて回動させ、外力である作業部の自重によって、作業部を第１領域Ｓ１から第２領域Ｓ２に回動させた様子を示す図１４等に示す。
Ｂは、機枠である。機枠Ｂは、走行機体Ａの後部の３点リンク機構を構成する昇降装置に装着する。Ｃは、伸縮手段である。伸縮手段Ｃは、機枠Ｂに取り付け、伸縮手段Ｃに取り付ける作業機を移動させるために伸縮する。
Ｅは、草刈装置である。草刈装置Ｅは、図１０に図示するように、走行機体Ａの側方に位置する伸縮手段Ｃの先端に取り付ける。 A grass cutting device according to an embodiment of the present invention will now be described with reference to the drawings.
A is a traveling machine body. The traveling machine body A is a tractor. Fig. 10 is a plan view showing an example of the traveling machine body A attached to the traveling machine body A and the telescopic means C, Fig. 11 is a rear view of the grass cutting device E showing an example of the grass cutting device E attached to the traveling machine body A and the telescopic means C, and showing a case where the obstacle pillar D2 is in the first area S1, Fig. 12 is a plan view of the grass cutting device E showing an example of the grass cutting device E attached to the traveling machine body A and the telescopic means C, and showing a case where the obstacle pillar D2 is in the second area S2, and Fig. 13 is a rear view of the grass cutting device E showing an example of the grass cutting device E attached to the traveling machine body A and the telescopic means C. FIG. 13 shows the case where the obstacle, which is a support pole, is in the second area S2; FIG. 14 is a rear view of the grass-cutting device E, showing an example in which the grass-cutting device E is attached to the running body A and the telescopic means C, in which the grass-cutting device E is rotated upward on the first area side S1 by a horizontal axis provided at the tip of the telescopic means C, and the working unit is rotated from the first area S1 to the second area S2 by the weight of the working unit, which is an external force.
B is a machine frame. The machine frame B is attached to a lifting device constituting a three-point link mechanism at the rear of the traveling machine body A. C is an extension means. The extension means C is attached to the machine frame B, and extends and retracts in order to move a working machine attached to the extension means C.
The grass cutting device E is attached to the tip of the extension means C located on the side of the traveling body A as shown in FIG.

Ｆは、取付部、Ｇは、フレームである。取付部ＦとフレームＧは相互に固定し、フレームＧは、伸縮手段ＣとフレームＧとの間に取り付ける。フレームＧは、草刈装置Ｅと取付部Ｆとの間に取り付け、作業アームを走行機体Ａ側に取り付ける。
Ｄは、ガードレールである。ガードレールＤは、草刈装置Ｅで草を刈る場合、特にガードレールＤの支柱等の近傍に生えた草を刈る場合の障害物となる。Ｄ１は、ガードレールＤのビーム、Ｄ２は、ガードレールＤの支柱（障害物）である。 F is the attachment portion and G is the frame. The attachment portion F and the frame G are fixed to each other, and the frame G is attached between the extension means C and the frame G. The frame G is attached between the grass cutting device E and the attachment portion F, and the working arm is attached to the traveling body A side.
D is a guardrail. The guardrail D becomes an obstacle when cutting grass with the grass cutting device E, particularly when cutting grass that has grown near the posts of the guardrail D. D1 is a beam of the guardrail D, and D2 is a post of the guardrail D (obstacle).

１１は、作業部である。作業部１１は、草刈装置Ｅに設ける。１２は、作業部１１を構成する天板である。天板１２は、平面視円形の一端を外側に伸ばした水滴状の変形円盤状からなり、中央には貫通孔を設ける。１３は、モータである。モータ１３は、中心に貫通孔を設けた作業部１１である天板１２の中心部に垂直方向に取り付ける。
１４は、接地体である。接地体１４はモータ１３の下部の設置面に設ける。１５は刈刃である。刈刃１５は、モータ１３から放射状に2個対向して設ける。刈刃１５の数は、３個あるいは４個等必要に応じて選択する。
作業部１１は、水平方向に回転する刈刃１５により草刈り作業をする。 Reference numeral 11 denotes a working unit. The working unit 11 is provided in the grass cutting device E. Reference numeral 12 denotes a top plate constituting the working unit 11. The top plate 12 has a deformed disc shape resembling a water drop with one end of a circle extending outward in a plan view, and has a through hole in the center. Reference numeral 13 denotes a motor. The motor 13 is attached vertically to the center of the top plate 12, which is the working unit 11 and has a through hole in the center.
Reference numeral 14 denotes a grounding body. The grounding body 14 is provided on the installation surface below the motor 13. Reference numeral 15 denotes a cutting blade. Two cutting blades 15 are provided radially opposite each other from the motor 13. The number of cutting blades 15 may be selected as necessary, such as three or four.
The working unit 11 performs grass cutting work using a cutting blade 15 that rotates horizontally.

４１は、支点軸である。支点軸４１は、走行機体Ａに装着した機枠Ｂ及び伸縮手段Ｃの先端部である、フレームＧに取り付ける。支点軸４１は、天板１２から突出した作業アーム１６の一端を回動自在に取り付けることで、作業部１１をフレームＧに取り付ける。
４２は、回動規制体である。回動規制体４２は、フレームＧ側の支点軸４１の近傍に配置して設ける。回動規制体４２は、作業アーム１６と接触して作業アーム１６の移動を規制する。 A fulcrum shaft 41 is attached to a frame G, which is the end of the machine frame B and the extension means C mounted on the traveling body A. One end of the working arm 16 protruding from the top plate 12 is rotatably attached to the fulcrum shaft 41, thereby attaching the working unit 11 to the frame G.
Reference numeral 42 denotes a rotation restricting body. The rotation restricting body 42 is disposed near the fulcrum shaft 41 on the frame G side. The rotation restricting body 42 comes into contact with the working arm 16 to restrict the movement of the working arm 16.

１６は、作業アームである。作業アーム１６は、天板１２上に取り付けることで作業部１１に取り付ける。作業アーム１６は、図３に図示するように、平面視、一端を天板１２から突出させる。
作業アーム１６の突出した一端は支点軸４１に取り付ける。他端は、作業部１１の回転中心であるモータ１３寄りに取り付ける。
そのため、作業部１１は作業アーム１６と一体となって支点軸４１を中心に水平回動する。 Reference numeral 16 denotes a working arm. The working arm 16 is attached to the working unit 11 by being attached onto the top plate 12. As shown in FIG. 3, one end of the working arm 16 protrudes from the top plate 12 in a plan view.
One protruding end of the working arm 16 is attached to the fulcrum shaft 41. The other end is attached to the side of the motor 13, which is the center of rotation of the working unit 11.
Therefore, the working unit 11 rotates horizontally together with the working arm 16 about the fulcrum shaft 41 .

Ｓ１は、第１領域である。Ｓ２は、第２領域である。第１領域Ｓ１、第２領域Ｓ２は、支点軸４１を通る進行方向と平行な線ｌ１を境にした領域である。第２領域Ｓ２は、線ｌ１より走行機体Ａ側の領域である。第１領域Ｓ１は、線ｌ１より走行機体Ａとは反対側の領域である。
図３図中左側が、進行方向である。
Ｒ１は、第１回動方向である。第１回動方向Ｒ１は、第１領域Ｓ１側への回動方向である。
Ｒ２は、第２回動方向である。第２回動方向Ｒ２は、第２領域Ｓ２側への回動方向である。 S1 is the first region. S2 is the second region. The first region S1 and the second region S2 are regions bounded by a line l1 that passes through the fulcrum axis 41 and is parallel to the traveling direction. The second region S2 is the region on the running body A side of the line l1. The first region S1 is the region on the opposite side of the line l1 from the running body A.
The left side in FIG. 3 is the traveling direction.
R1 is a first rotation direction. The first rotation direction R1 is a rotation direction toward the first region S1.
R2 is a second rotation direction. The second rotation direction R2 is a rotation direction toward the second region S2.

作業アーム１６は、一方側を支点軸４１に取付けており、第１回動方向Ｒ１あるいは第２回動方向Ｒ２への回動によって、作業アーム１６の他方側が前記支点軸４１を通る進行方向と平行な線ｌ１を境にした領域である第１領域Ｓ１及び第２領域Ｓ２とに移動可能である。 One side of the working arm 16 is attached to the fulcrum shaft 41, and by rotating in the first rotation direction R1 or the second rotation direction R2, the other side of the working arm 16 can move between a first region S1 and a second region S2, which are regions bounded by a line l1 that passes through the fulcrum shaft 41 and is parallel to the direction of travel.

２１は、ガイドロッドである。ガイドロッド２１は、棒状からなる。２２は、ばねからなる付勢体である。２３は、ガイドロッド保持部である。
ガイドロッド保持部２３は、図２、図３に図示するように、円柱状からなり、作業アーム１６に基部を固定する。
ガイドロッド保持部２３は、図２に図示するように、円柱状側面に貫通孔２４を有し、貫通孔２４にガイドロッド２１を貫通させて、ガイドロッド２１を摺動させ、作業アーム１６に水平方向に回動自在に設置するガイドロッド２１の移動をガイドする。 Reference numeral 21 denotes a guide rod. The guide rod 21 is rod-shaped. Reference numeral 22 denotes a biasing body made of a spring. Reference numeral 23 denotes a guide rod holding portion.
As shown in FIGS. 2 and 3 , the guide rod holding portion 23 is cylindrical and has a base portion fixed to the working arm 16 .
As shown in Figure 2, the guide rod holding portion 23 has a through hole 24 on its cylindrical side surface, and the guide rod 21 passes through the through hole 24 to slide the guide rod 21, thereby guiding the movement of the guide rod 21 which is installed on the working arm 16 so as to be freely rotatable in the horizontal direction.

付勢体２２（バネ）は、ガイドロッド２１の周囲に嵌めることで、ガイドロッド２１を介して作業アーム１６と後述する切換片３１間に設け、作業アーム１６と切換片３１を、支点軸４１を軸にした第１回動方向Ｒ１と第２回動方向Ｒ２のそれぞれの方向に付勢する。
付勢体２２は、作業アーム１６を第１領域Ｓ１あるいは第２領域Ｓ２のいずれか一方に突出させるとともに、作業アーム１６を第１領域Ｓ１あるいは前記第２領域Ｓ２のいずれか一方に付勢する。作業部１１は、付勢体（バネ）２２によって一方（第１領域Ｓ１）あるいは他方（第２領域Ｓ２）のいずれか一方に、付勢される。
２５は、付勢体規制部である。付勢体規制部２５は、ガイドロッド２１のガイドロッド支点部３２寄りに取り付け、付勢体２２のガイドロッド支点部３２方向への移動を規制する。ガイドロッド支点部３２については後述する。 The biasing body 22 (spring) is fitted around the guide rod 21 and is disposed between the working arm 16 and the switching piece 31 described later via the guide rod 21, and biases the working arm 16 and the switching piece 31 in each of the first rotation direction R1 and the second rotation direction R2 around the fulcrum shaft 41.
The biasing body 22 projects the working arm 16 to either the first region S1 or the second region S2, and biases the working arm 16 to either the first region S1 or the second region S2. The working unit 11 is biased by the biasing body (spring) 22 to either one side (the first region S1) or the other side (the second region S2).
A biasing body restricting portion 25 is attached to the guide rod 21 near the guide rod fulcrum portion 32, and restricts the movement of the biasing body 22 toward the guide rod fulcrum portion 32. The guide rod fulcrum portion 32 will be described later.

３１は、切換片である。切換片３１は、平面視全体として扇型からなる。
切換片３１は、支点軸４１への取り付け箇所より進行方向に対する左右の幅方向に広がりを有する。この実施例では、切換片３１は扇型からなり、扇状の要位置である頂点に回動可能に支点軸４１に取り付ける。
切換片３１は作業アーム１６と別体であるが、支点軸４１が共通の同軸に設ける。 A switching piece 31 has a sector shape as a whole in a plan view.
The switching piece 31 has a width extending to the left and right of the direction of travel from the point of attachment to the fulcrum shaft 41. In this embodiment, the switching piece 31 is fan-shaped and is attached to the fulcrum shaft 41 so as to be rotatable at the apex, which is a key position of the fan shape.
The switching piece 31 is separate from the working arm 16, but the fulcrum shaft 41 is provided coaxially with the working arm 16.

３３は、規制部である。規制部３３は、長円形の支点軸４１を中心とする円弧状長孔状に、設ける。更に、規制部３３は、切換片３１のガイドロッド支点部３２取り付け部の反対側寄りに切換片３１に設ける。規制部３３は、回動規制体４２に嵌合し、切換片３１の移動を規制し、回動規制体４２に接触して切換片３１の回動を規制する。
３４は、第１規制部である。第１規制部３４は、規制部３３の一端である、切換片３１の中央部寄りに設ける。
第１規制部３４は、切換片３１が第１領域Ｓ１側に回動する方向である第１回動方向Ｒ１への回動を規制する。 Reference numeral 33 denotes a restricting portion. The restricting portion 33 is provided in the shape of an arc-shaped long hole centered on an oval fulcrum shaft 41. Furthermore, the restricting portion 33 is provided on the switching piece 31 on the opposite side of the mounting portion of the guide rod fulcrum portion 32 of the switching piece 31. The restricting portion 33 fits into a rotation restricting body 42 to restrict the movement of the switching piece 31, and comes into contact with the rotation restricting body 42 to restrict the rotation of the switching piece 31.
A first restricting portion 34 is provided at one end of the restricting portion 33, that is, toward the center of the switching piece 31.
The first restricting portion 34 restricts the switching piece 31 from rotating in a first rotation direction R1, which is the direction in which the switching piece 31 rotates toward the first region S1.

３５は、第２規制部である。第２規制部３５は、規制部３３の他端である、切換片３１の端部寄りであって、第１規制部３４の反対端に設ける。
第２規制部３５は、切換片３１が前記第２領域Ｓ２側に回動する方向である第２回動方向Ｒ２への回動を規制する。
規制部３３の両端部に、長孔状の端部からなる第１規制部３４及び第２規制部３５を設ける。
３２は、ガイドロッド支点部である。ガイドロッド支点部３２は、切換片３１の表面から突設する。
ガイドロッド２１の一端を回動自在に取り付ける。 A second restricting portion 35 is provided at the other end of the restricting portion 33, that is, near the end of the switching piece 31, and at the opposite end to the first restricting portion .
The second restricting portion 35 restricts the rotation of the switching piece 31 in a second rotation direction R2, which is the direction in which the switching piece 31 rotates toward the second region S2.
A first restricting portion 34 and a second restricting portion 35 each having an elongated hole-shaped end are provided at both ends of the restricting portion 33 .
A guide rod fulcrum portion 32 projects from the surface of the switching piece 31.
One end of a guide rod 21 is rotatably attached.

図３に図示するように、規制部３３と、ガイドロッド支点部３２とを切換片３１の幅広状部分である扇状の離れた、異なる両端部付近にそれぞれ設ける。平面扇型の図示右側端の第２領域Ｓ２側付近にガイドロッド支点部３２、左側端の第１領域Ｓ１側付近に規制部３３及び回動規制体４２を設ける。
切換片３１の扇の要位置であり頂点である支点軸４１を挟んだ両端の一方に規制部３３、第２規制部３５を設ける。規制部３３の第２領域Ｓ２側に第１規制部３４を設ける。規制部３３の第１領域Ｓ１側に第２規制部３５を設ける。
支点軸４１と、ガイドロッド支点部３２と、規制部３３、回動規制体４２は別個に設けてある。切換片３１において、ガイドロッド支点部３２と、規制部３３はそれぞれ異なる端部に離して設ける。 3, the restricting portion 33 and the guide rod fulcrum portion 32 are provided near two separate ends of the wide portion of the fan shape of the switching piece 31. The guide rod fulcrum portion 32 is provided near the second region S2 side at the right end of the planar fan shape in the figure, and the restricting portion 33 and the rotation restricting body 42 are provided near the first region S1 side at the left end.
A restricting portion 33 and a second restricting portion 35 are provided on one of the two ends sandwiching a fulcrum shaft 41 which is the apex and key position of the sector of the switching piece 31. A first restricting portion 34 is provided on the second region S2 side of the restricting portion 33. A second restricting portion 35 is provided on the first region S1 side of the restricting portion 33.
The fulcrum shaft 41, the guide rod fulcrum portion 32, the restricting portion 33, and the rotation restricting body 42 are provided separately. In the switching piece 31, the guide rod fulcrum portion 32 and the restricting portion 33 are provided separately at different ends.

第１領域Ｓ１側に位置する作業アーム１６を、付勢体２２の付勢力に抗して、第１領域Ｓ１側から第２領域Ｓ２側に外力を加えると、作業アーム１６の位置は第２領域Ｓ２側に位置するように第２回動方向Ｒ２へ回動して切り換わる。
第２領域Ｓ２側に位置する作業アーム１６を、付勢体２２の付勢力に抗して、第２領域Ｓ２側から第１領域Ｓ１側に外力を加えると、作業アーム１６の位置は第１領域Ｓ１側に位置するように第１回動方向Ｒ１へ回動して切り換わる。 When an external force is applied from the first region S1 side to the second region S2 side to the working arm 16 located on the first region S1 side, against the biasing force of the biasing body 22, the position of the working arm 16 rotates in the second rotation direction R2 so that it is located on the second region S2 side.
When an external force is applied from the second region S2 side to the first region S1 side to the working arm 16 located on the second region S2 side, against the biasing force of the biasing body 22, the position of the working arm 16 rotates in the first rotation direction R1 so that it is located on the first region S1 side.

第１領域Ｓ１側に位置する作業アーム１６を、第２領域Ｓ２側に移動させると、回動規制体４２が第１規制部３４に接触して切換片３１の第１回動方向Ｒ１への回動を規制する。
第２領域Ｓ２側に位置する作業アーム１６を、第１領域Ｓ１側に移動させると、回動規制体４２が第２規制部３５に接触して切換片３１の第２回動方向Ｒ２への回動を規制する。 When the working arm 16 located on the first region S1 side is moved toward the second region S2 side, the rotation restricting body 42 comes into contact with the first restricting portion 34 to restrict the rotation of the switching piece 31 in the first rotation direction R1.
When the working arm 16 located on the second region S2 side is moved toward the first region S1 side, the rotation restricting body 42 comes into contact with the second restricting portion 35 to restrict the rotation of the switching piece 31 in the second rotation direction R2.

草刈装置Ｅ等の作業機に係る、車輪ユニット５１及び車輪ユニット５１を備えた作業機である草刈装置Ｅについて、この発明の実施例に係る草刈装置Ｅである作業機の正面図をあらわす図１、側面図をあらわす図である図２、草刈装置Ｅの側面図で車輪ユニット５１の作用をあらわす図であり、草刈装置Ｅの側面図で作業アーム１６が第１領域Ｓ１での復帰位置のときを示す図１５及び図１６等にしたがって、説明する。
作業アーム１６は、支持部材５２の上方で支点軸４１を中心に回動可能である。作業部１１は、作業アーム１６の回動する半径方向の端部に設けて作業を行う。 The wheel unit 51 and the grass cutting device E, which is a working machine equipped with the wheel unit 51, relating to a working machine such as the grass cutting device E, will be explained with reference to Figure 1, which shows a front view of the working machine which is the grass cutting device E according to an embodiment of the present invention, Figure 2, which shows a side view, Figures 15 and 16, which are side views of the grass cutting device E showing the function of the wheel unit 51 and side views of the grass cutting device E showing the working arm 16 in the return position in the first area S1, etc.
The working arm 16 is rotatable about a fulcrum shaft 41 above the support member 52. The working unit 11 is provided at the end of the working arm 16 in the rotating radial direction and performs work.

４１１は、鉛直軸である。鉛直軸４１１は、支点軸４１の延長上に設け草刈装置Ｅに、鉛直に設置する。
５１は、車輪ユニットである。車輪ユニット５１は、支持部材５２、第１橇部５３、第２橇部５４、車輪５５、回転中心軸５６を有する。ａは第１橇幅、ｂは隙間、ｃは車輪幅である。 A vertical shaft 411 is provided on an extension of the fulcrum shaft 41 and is installed vertically on the grass cutting device E.
Reference numeral 51 denotes a wheel unit. The wheel unit 51 includes a support member 52, a first sled portion 53, a second sled portion 54, a wheel 55, and a rotation center shaft 56. "a" denotes the first sled width, "b" denotes the gap, and "c" denotes the wheel width.

支持部材５２は、鉛直軸４１１周りの水平方向に回動可能に設け、且つ、作業面に接地して回転する車輪５５を挟んで支持する。
支持部材５２で支持する車輪５５の前後方向は開放されているので、草刈装置Ｅの走行時に車輪５５で巻き上げた土や草がそのまま地面に落下、又は、車輪５５外径の回転で車輪５５の前後に放擲することができる。したがって、異物が第１橇部５３及び第２橇部５４に堆積せず、車輪５５の回転に支障をきたさない。
この発明の実施例では、支持部材５２と車輪５５との隙間ｂを広く確保しているので、この隙間ｂへの土の詰まりや草の絡みなどの、隙間ｂへの異物の侵入による車輪５５の回転不良を抑制できる。 The support member 52 is provided so as to be rotatable in the horizontal direction around a vertical axis 411, and supports wheels 55 which rotate while in contact with the work surface.
Because the wheels 55 supported by the support members 52 are open in the front-to-rear direction, soil and grass kicked up by the wheels 55 when the grass-cutting device E is traveling can fall to the ground as is, or can be thrown in front of and behind the wheels 55 by the rotation of the outer diameter of the wheels 55. Therefore, foreign matter does not accumulate on the first sled portion 53 and the second sled portion 54, and does not interfere with the rotation of the wheels 55.
In this embodiment of the present invention, a wide gap b between the support member 52 and the wheel 55 is ensured, thereby preventing the wheel 55 from rotating poorly due to the intrusion of foreign matter into the gap b, such as soil clogging or grass getting tangled.

第１橇部５３は、支持部材５２に設けるとともに車輪５５を挟んで配置し、車輪５５の接地面より上方且つ前記車輪５５の回転中心軸５６より下方に位置させる。
第１橇部５３は水平面を有しており、土や草等に覆われた軟弱地の作業で車輪５５が沈んだ際、第１橇部５３の底面全体で地面を受け止めることによって、車輪５５全体の沈み込みを抑制する。なお、１つの第１橇部５３の左右幅は車輪５５の左右幅より広く設ける。
実施例では車輪５５幅を２５ｍｍ、第１橇部５３の左右幅を４０ｍｍとしている。第１橇部５３全体としての左右幅は車輪幅ｃの３倍以上が望ましい。１つの第１橇部５３の幅を車輪幅ｃより広くすることで、車輪５５のみと比較して面圧を低下させることができる。実施例では、第１橇部５３全体の接地圧は車輪５５のみの接地圧と比較して、１／３程度まで減少させている。 The first sled portion 53 is provided on the support member 52 and disposed across the wheel 55 , and is positioned above the ground contact surface of the wheel 55 and below the central axis of rotation 56 of the wheel 55 .
The first sled section 53 has a horizontal surface, and when the wheels 55 sink during work on soft ground covered with soil or grass, the entire bottom surface of the first sled section 53 receives the ground, thereby preventing the entire wheels 55 from sinking. The lateral width of one first sled section 53 is set to be wider than the lateral width of the wheels 55.
In the embodiment, the width of the wheel 55 is 25 mm, and the left-right width of the first sled portion 53 is 40 mm. The left-right width of the entire first sled portion 53 is preferably three times or more the wheel width c. By making the width of one first sled portion 53 wider than the wheel width c, the surface pressure can be reduced compared to the wheel 55 alone. In the embodiment, the ground pressure of the entire first sled portion 53 is reduced to about 1/3 compared to the ground pressure of the wheel 55 alone.

第２橇部５４は、車輪５５を挟み込んで支持部材５２に設け、第１橇部５３の進行方向前端から連続するように第１橇部５３に対し上方に傾斜させる。
第２橇部５４は、走行面に対しておおよそ４５度角程度の傾斜面をなし、車輪５５径で乗り越えできない段差、起伏等の障害物を傾斜面に沿って滑りながら、すなわち草刈装置Ｅの上昇も伴い、乗り越える。実施例において、第２橇部５４の左右幅は第１橇部５３の左右幅と同じ４０ｍｍとしていて、第２橇部５４に乗り上げた場合の、第２橇部５４にかかる接地圧を減少させることができる。また、実施例の場合、第１橇部５３及び第２橇部５４の幅を車輪幅ｃより幅広に設けるとともに、第１橇部５３及び第２橇部５４を車輪５５の左右側方のそれぞれに設けているので、第１橇部５３及び第２橇部５４による接地圧を効果的に低減させている。したがって、図１５に示すような車輪５５が走行面Ｌ１より下方に埋まってしまうような軟弱地であっても、第１橇部５３及び第２橇部５４で走行面Ｌ１を捉えて、草刈装置Ｅが走行面Ｌ１の下方に埋まらないようにできる。
なお、実施例での傾斜面は４５度角程度としているが、３０乃至４５度角であれば、走行面に存在する走行面Ｌ２から車輪５５の回転半径の１／２より高い起伏等の障害物Ｄ３の乗り越えに支障はきたさない。また、傾斜面は湾曲させてもよく、湾曲させた湾曲面の接線が走行面に対して３０乃至４５度角であれば、図１６に示すような走行面Ｌ２に存在する障害物Ｄ３を乗り越えることができる。 The second sled portion 54 is attached to the support member 52 with the wheels 55 sandwiched therebetween, and is inclined upward with respect to the first sled portion 53 so as to be continuous with the front end of the first sled portion 53 in the traveling direction.
The second sled portion 54 forms an inclined surface at an angle of about 45 degrees with respect to the traveling surface, and overcomes obstacles such as steps and undulations that cannot be overcome with the diameter of the wheels 55 while sliding along the inclined surface, i.e., with the grass cutting device E rising. In the embodiment, the left-right width of the second sled portion 54 is 40 mm, the same as the left-right width of the first sled portion 53, so that the ground pressure applied to the second sled portion 54 when it rides up on the second sled portion 54 can be reduced. In addition, in the embodiment, the width of the first sled portion 53 and the second sled portion 54 is set wider than the wheel width c, and the first sled portion 53 and the second sled portion 54 are provided on the left and right sides of the wheels 55, respectively, so that the ground pressure by the first sled portion 53 and the second sled portion 54 is effectively reduced. Therefore, even on soft ground such that the wheels 55 become buried below the running surface L1 as shown in Figure 15, the first sled section 53 and the second sled section 54 can grasp the running surface L1, preventing the grass cutting device E from becoming buried below the running surface L1.
In the embodiment, the inclined surface is about 45 degrees, but if the angle is between 30 and 45 degrees, there is no problem in getting over obstacles D3 such as undulations that exist on the running surface L2 and are higher than half the turning radius of the wheels 55. The inclined surface may be curved, and if the tangent of the curved surface is at an angle of 30 to 45 degrees to the running surface, it will be possible to get over obstacles D3 that exist on the running surface L2 as shown in FIG.

第２橇部５４の前縁面、または傾斜面の延長線が車輪５５外周に接する位置にある。また、第２橇部５４と第１橇部５３の遷移点である第２橇部５４の傾斜面の下端部は、走行面から車輪５５の回転半径の１／２程度の高さに設ける。これらによって、車輪５５では乗り越えできない高さの障害物があっても、第２橇部５４によって車輪５５が障害物Ｄ３に乗り上がることを可能とし、車輪５５では乗り越えできない高さの障害物が車輪５５に衝突して、障害物Ｄ３を乗り越えることができなくなることを防ぐ。
第１橇部５３及び前記第２橇部５４は、進行方向に対する前方から見たときにおいて、車輪５５と重複しないように配置している。車輪５５の前後に他の部材を存在させないことにより、車輪５５の回転に伴って回転方向に巻き上げられる走行面の土砂や夾雑物等の異物が、車輪５５と、第１橇部５３及び第２橇部５４との間に噛み込んで、車輪５５が回転できなくなることを防ぐ。すなわち、車輪５５は走行面の状態によらず、車輪５５の回転を阻害されることがない。 The leading edge surface of the second sled section 54, or an extension of the inclined surface, is located in a position that contacts the outer periphery of the wheel 55. In addition, the lower end of the inclined surface of the second sled section 54, which is the transition point between the second sled section 54 and the first sled section 53, is located at a height of about 1/2 the turning radius of the wheel 55 from the running surface. As a result, even if there is an obstacle that is too high for the wheel 55 to overcome, the second sled section 54 enables the wheel 55 to climb up the obstacle D3, and prevents the wheel 55 from colliding with the obstacle that is too high for the wheel 55 to overcome, making it impossible to overcome the obstacle D3.
The first sled unit 53 and the second sled unit 54 are positioned so as not to overlap the wheels 55 when viewed from the front in the direction of travel. By not having other members in front of or behind the wheels 55, foreign objects such as sand and debris on the traveling surface that are kicked up in the rotational direction as the wheels 55 rotate are prevented from becoming caught between the wheels 55 and the first sled unit 53 and the second sled unit 54, preventing the wheels 55 from being unable to rotate. In other words, the rotation of the wheels 55 is not hindered regardless of the condition of the traveling surface.

回転中心軸５６は、車輪５５の回転中心軸であって、車輪５５を回転させる。
車輪５５の側面と支持部材５２の側面とで形成する隙間ｂの距離は前記車輪５５の接地幅の０．２～０．８倍の距離である。
車輪５５の回転外周面５５１は、第２橇部５４が有する面と同じ又は第２橇部５４が有する面から進行方向に対するやや後方に位置する。これにより、第２橇部５４が起伏等の障害物を乗り越えた次の瞬間に、車輪５５の回転外周面５５１の下部側を起伏等の障害物に接地させることができる。したがって、車輪ユニット５１は起伏等の障害物を容易に乗り越えることができる。
車輪幅ｃは、第１橇部５３及び前記第２橇部５４の進行方向に対する前方から見たときの幅より狭く設ける。車輪幅ｃは幅広く設けないので、車輪５５が接地状態で鉛直軸４１１周りに回動しても、車輪幅ｃによる旋回抵抗を低くできる。すなわち、前進する草刈装置Ｅが走行面に対して左右方向に移動することがあっても、車輪５５を移動方向に容易に向けることが可能である。 The rotation center shaft 56 is the rotation center shaft of the wheel 55 and causes the wheel 55 to rotate.
The distance of the gap b formed between the side surface of the wheel 55 and the side surface of the support member 52 is 0.2 to 0.8 times the ground contact width of the wheel 55 .
The rotating outer circumferential surface 551 of the wheel 55 is located at the same position as the surface of the second sled unit 54 or slightly behind the surface of the second sled unit 54 in the traveling direction. This allows the lower side of the rotating outer circumferential surface 551 of the wheel 55 to contact the obstacle such as an undulating surface the moment the second sled unit 54 overcomes the obstacle such as an undulating surface. Therefore, the wheel unit 51 can easily overcome the obstacle such as an undulating surface.
The wheel width c is set narrower than the width of the first sled unit 53 and the second sled unit 54 when viewed from the front in the traveling direction. Since the wheel width c is not set wide, the turning resistance due to the wheel width c can be reduced even when the wheels 55 rotate around the vertical shaft 411 in a grounded state. In other words, even if the advancing grass cutting device E moves left and right relative to the traveling surface, the wheels 55 can be easily oriented in the traveling direction.

伸縮手段Ｃは、作業アーム１６及び作業部１１を上下左右に移動させることができるとともに走行機体Ａに装着可能である。伸縮手段Ｃを介して装着することで、作業部１１を多様な方向からアプローチさせることができるので、作業場所に対する作業部１１の適応性を拡大できる。
この車輪ユニット５１を装着した作業機である草刈装置Ｅによれば、車輪５５を舗装路面等の硬い路面を走行させて作業部１１で作業する場合や、車輪５５を土や草の生い茂った軟弱地を走行させて作業部１１で作業する場合が混在しても、車輪ユニット５１を走行面に合わせた専用品にせずとも、同一のユニットで使用することが可能で、段差等の障害物を乗り越えることができる。 The telescopic means C can move the working arm 16 and the working unit 11 up, down, left and right, and can be attached to the traveling machine body A. By attaching it via the telescopic means C, the working unit 11 can be approached from various directions, thereby expanding the adaptability of the working unit 11 to the work location.
With the grass cutting device E, which is a working machine equipped with this wheel unit 51, even if there is a mixture of cases where the wheels 55 are driven on hard surfaces such as paved roads to work on the working part 11, and cases where the wheels 55 are driven on soft ground overgrown with soil or grass to work on the working part 11, the wheel unit 51 can be used as the same unit without being a dedicated item for the running surface, and it can overcome obstacles such as steps.

この発明の実施例に係る草刈装置の側面図であって、車輪ユニット５１の作用をあらわす図である図１５に図示する、Ｌ１は、車輪５５の走行面Ｌ１が軟弱地である場合の走行面である。車輪５５は、軟弱地の走行面Ｌ１にめり込んでいる。
この発明の実施例に係る草刈装置の側面図であって、作業アーム１６が第１領域Ｓ１での復帰位置のときを示す図１６に図示するＬ２は、車輪５５の走行面Ｌ１に障害物Ｄ３が突出している場合の走行面である。支持部材５２が、障害物Ｄ３に衝突し、車輪５５は、走行面Ｌ２から浮遊している。 15 is a side view of the grass cutting device according to the embodiment of the present invention, showing the operation of the wheel unit 51. L1 is the running surface when the running surface L1 of the wheels 55 is soft ground. The wheels 55 are embedded in the running surface L1 of the soft ground.
16 is a side view of the grass cutting device according to an embodiment of the present invention, showing the working arm 16 in a return position in the first region S1, L2 is the running surface when an obstacle D3 protrudes from the running surface L1 of the wheels 55. The support member 52 collides with the obstacle D3, and the wheels 55 are floating above the running surface L2.

この発明の実施例の作業部１１を一方側である第１領域Ｓ１から他方側である第２領域Ｓ２へ切り換える様子を示す作用をあらわす図４乃至図６について説明する。図４至図６は、作業部１１を一方側である第１領域Ｓ１から他方側である第２領域Ｓ２へ切り換える様子を示した図である。図中左が進行方向前方である。
図４では、作業部１１が第１領域Ｓ１にあり、付勢体２２で第１の復帰位置（元の位置）にある状態である。作業アーム１６は回動規制体４２に接触し、切換片３１の第２規制部３５が回動規制体４２に接触している。
付勢体２２は、伸状態をとる。 4 to 6, which show the operation of switching the working unit 11 of the embodiment of the present invention from the first area S1 on one side to the second area S2 on the other side, will be described. Figures 4 to 6 are views showing the operation of switching the working unit 11 from the first area S1 on one side to the second area S2 on the other side. The left side of the figures is the forward direction of travel.
4, the working unit 11 is in the first region S1 and is in the first return position (original position) by the biasing body 22. The working arm 16 is in contact with the rotation restricting body 42, and the second restricting portion 35 of the switching piece 31 is in contact with the rotation restricting body 42.
The biasing body 22 is in an extended state.

図５では、作業アーム１６を、自重あるいは人力など外力によって、第１領域Ｓ１から第２領域Ｓ２側に回動させ、作業アーム１６は回動規制体４２に接触する直前となっている。
切換片３１の第２規制部３５が回動規制体４２に接触したままであって、付勢体２２によって切換片３１が第１回動方向Ｒ１側に回動する直前の状態である。
切換片３１は、図４から支点軸４１を回動中心として回動しておらず、図４と同じ回転状態にある。 In FIG. 5, the working arm 16 has been rotated from the first region S1 to the second region S2 by its own weight or an external force such as human force, and the working arm 16 is about to come into contact with the rotation restricting body 42.
In this state, the second restricting portion 35 of the switching piece 31 remains in contact with the rotation restricting body 42, and the switching piece 31 is about to be rotated in the first rotation direction R1 by the biasing body 22.
The switching piece 31 has not rotated about the fulcrum shaft 41 from FIG. 4, and is in the same rotational state as in FIG.

作業アーム１６は、支点軸４１を回動中心として図４に示す状態から、図５に図示する図中上側である第２領域Ｓ２側に回動しているが、切換片３１は図５に図示する状態は、図４に図示する状態から第２規制部３５に規制されて第２領域Ｓ２側に回動していない。ガイドロッド支点部３２は、切換片３１の図５の図中上側である第２領域Ｓ２側に位置してある。そのため、作業アーム１６の図４に図示する状態から図５に図示する状態への移動により、ガイドロッド保持部２３及び付勢体規制部２５とガイドロッド支点部３２との間隔は、狭くなる。そのため、ガイドロッド２１は、ガイドロッド保持部２３を摺動して、付勢体２２は、縮状態をとる。
支点軸４１を回動中心とする作業部１１の回動に伴い、ガイドロッド２１はガイドロッド支点部３２からガイドロッド保持部２３側に押され、付勢体２２は、ガイドロッド保持部２３と付勢体規制部２５に押されて縮状態をとる。ガイドロッド保持部２３とガイドロッド２１のモータ１３側である作業部１１中心側端部との間に付勢体２２で覆われていない部分が多くなる。 The working arm 16 rotates from the state shown in Fig. 4 to the second region S2 side, which is the upper side in Fig. 5, with the fulcrum shaft 41 as the center of rotation, but the switching piece 31 does not rotate from the state shown in Fig. 4 to the second region S2 side in Fig. 5 because it is restricted by the second restricting portion 35. The guide rod fulcrum portion 32 is located on the second region S2 side, which is the upper side in Fig. 5, of the switching piece 31. Therefore, the distance between the guide rod holding portion 23 and the biasing body restricting portion 25 and the guide rod fulcrum portion 32 becomes narrower as the working arm 16 moves from the state shown in Fig. 4 to the state shown in Fig. 5. Therefore, the guide rod 21 slides on the guide rod holding portion 23, and the biasing body 22 takes the contracted state.
As the working unit 11 rotates about the fulcrum shaft 41, the guide rod 21 is pushed from the guide rod fulcrum portion 32 toward the guide rod holding portion 23, and the biasing body 22 is pushed by the guide rod holding portion 23 and the biasing body regulating portion 25 to assume a contracted state. A large portion is not covered by the biasing body 22 between the guide rod holding portion 23 and the end of the guide rod 21 on the motor 13 side of the working unit 11.

図６では、図５の状態のとき、平面視で、ガイドロッド支点部３２が支点軸４１とガイドロッド保持部２３を結ぶ直線より第１領域Ｓ１側にあるので、切換片３１が付勢体２２によって第１回動方向Ｒ１に回動し、切換片３１の第１規制部３４が回動規制体４２に接触するまで回動する。
作業部１１が第２領域Ｓ２で付勢体２２によって、作業アーム１６を回動規制体４２に接触するまで回動し、第２の復帰位置にある状態となる。
付勢体２２は、伸状態をとる。付勢体２２は、伸状態をとるため、切換片３１は、ガイドロッド支点部３２側が、図５に図示する第２領域Ｓ２側にある状態から第１領域Ｓ１側の第１回動方向Ｒ１へ回転する。 In Figure 6, when in the state of Figure 5, when viewed in a plan view, the guide rod fulcrum portion 32 is located on the first region S1 side of the straight line connecting the fulcrum axis 41 and the guide rod holding portion 23, so that the switching piece 31 rotates in the first rotation direction R1 by the biasing body 22, and rotates until the first regulating portion 34 of the switching piece 31 comes into contact with the rotation regulating body 42.
In the second region S2 of the working unit 11, the biasing member 22 rotates the working arm 16 until the working arm 16 contacts the rotation restricting member 42, and the working unit 11 is in the second return position.
The biasing body 22 is in an extended state. Since the biasing body 22 is in an extended state, the switching piece 31 rotates in the first rotation direction R1 from a state in which the guide rod fulcrum portion 32 side is located on the second region S2 side shown in FIG. 5 to the first region S1 side.

この発明の実施例の作業部１１を他方側である第２領域Ｓ２から一方側である第１領域Ｓ１へ切り換える様子を示す作用をあらわす図７乃至図９について説明する。図中左が進行方向前方である。図７では、作業部１１が第２領域Ｓ２に有り、付勢体２２で第２の復帰位置（元の位置）にある状態である。
図７では、作業アーム１６は、回動規制体４２に接触し、切換片３１の第１規制部３４が回動規制体４２に接触している。
付勢体２２は、伸状態をとる。 7 to 9, which show the operation of switching the working unit 11 of the embodiment of the present invention from the second region S2 on the other side to the first region S1 on one side. The left side of the figure is the front in the direction of travel. In Fig. 7, the working unit 11 is in the second region S2 and is in the second return position (original position) by the biasing body 22.
In FIG. 7 , the working arm 16 is in contact with the rotation restricting body 42 , and the first restricting portion 34 of the switching piece 31 is in contact with the rotation restricting body 42 .
The biasing body 22 is in an extended state.

図８では、作業アーム１６を、自重あるいは人力など外力によって、第２領域Ｓ２から第１領域Ｓ１側に回動させ、作業アーム１６は回動規制体４２に接触する直前となっている。
切換片３１の第１規制部３４が回動規制体４２に接触したままであって、付勢体２２によって切換片３１が第２回動方向Ｒ２に回動する直前の状態である。
切換片３１は、図７から支点軸４１を回動中心として回動しておらず、図７と同じ回転状態にある。 In FIG. 8, the working arm 16 has been rotated from the second region S2 to the first region S1 by its own weight or an external force such as human force, and the working arm 16 is about to come into contact with the rotation restricting body 42.
In this state, the first restricting portion 34 of the switching piece 31 remains in contact with the rotation restricting body 42, and the switching piece 31 is about to be rotated in the second rotation direction R2 by the biasing body 22.
The switching piece 31 has not rotated about the fulcrum shaft 41 from FIG. 7, and is in the same rotational state as in FIG.

作業アーム１６は、支点軸４１を回動中心として図７に示す状態から、図８に図示する図中下側である第１領域Ｓ１側に回動しているが、切換片３１は図８に図示する状態は、図７に図示する状態から第１規制部３４に規制されて第１領域Ｓ１側に回動していない。ガイドロッド支点部３２は、切換片３１の図８の図中下側である第１領域Ｓ１側に位置している。そのため、作業アーム１６の図７に図示する状態から図８に図示する状態への移動により、ガイドロッド保持部２３及び付勢体規制部２５とガイドロッド支点部３２との間隔は、狭くなる。そのため、ガイドロッド２１は、ガイドロッド保持部２３を摺動して、付勢体２２は、縮状態をとる。
支点軸４１を回動中心とする作業部１１の回動に伴い、ガイドロッド２１はガイドロッド支点部３２からガイドロッド保持部２３側に押され、付勢体２２は、ガイドロッド保持部２３と付勢体規制部２５に押されて縮状態をとる。ガイドロッド保持部２３とガイドロッドのモータ１３側である作業部１１中心側端部との間に付勢体２２で覆われていない部分が多くなる。 The working arm 16 rotates from the state shown in Fig. 7 around the fulcrum shaft 41 toward the first region S1, which is the lower side in Fig. 8, but the switching piece 31 does not rotate toward the first region S1 from the state shown in Fig. 7 in the state shown in Fig. 8 because it is restricted by the first restricting portion 34. The guide rod fulcrum portion 32 is located on the first region S1 side, which is the lower side in Fig. 8, of the switching piece 31. Therefore, the distance between the guide rod holding portion 23 and the biasing body restricting portion 25 and the guide rod fulcrum portion 32 becomes narrower as the working arm 16 moves from the state shown in Fig. 7 to the state shown in Fig. 8. Therefore, the guide rod 21 slides on the guide rod holding portion 23, and the biasing body 22 takes the contracted state.
As the working unit 11 rotates about the fulcrum shaft 41, the guide rod 21 is pushed from the guide rod fulcrum portion 32 toward the guide rod holding portion 23, and the biasing body 22 is pushed by the guide rod holding portion 23 and the biasing body regulating portion 25 to assume a contracted state. A large portion is not covered by the biasing body 22 between the guide rod holding portion 23 and the end of the guide rod on the motor 13 side of the working unit 11.

図９では、図８の状態のとき、平面視で、ガイドロッド支点部３２が支点軸４１とガイドロッド保持部２３を結ぶ直線より第２領域Ｓ２側にあるので、切換片３１が付勢体２２によって第２回動方向Ｒ２に回動し、切換片３１の第２規制部３５が回動規制体４２に接触するまで回動する。
作業部１１が第１領域Ｓ１で付勢体２２によって、作業アーム１６を回動規制体４２に接触するまで回動させ、第１の復帰位置にある状態となる。
付勢体２２は、伸状態をとる。付勢体２２は、伸状態をとるため、切換片３１は、図８の第１領域Ｓ１側にある状態から第２領域Ｓ２側の第２回動方向Ｒ２に回転する。 In Figure 9, when in the state of Figure 8, when viewed in a plan view, the guide rod fulcrum portion 32 is located on the second region S2 side of the straight line connecting the fulcrum axis 41 and the guide rod holding portion 23, so that the switching piece 31 rotates in the second rotation direction R2 by the biasing body 22, and rotates until the second regulating portion 35 of the switching piece 31 comes into contact with the rotation regulating body 42.
When the working unit 11 is in the first region S1, the biasing member 22 causes the working arm 16 to rotate until it contacts the rotation restricting member 42, and the working unit 11 is in the first return position.
The biasing body 22 is in an extended state. Since the biasing body 22 is in an extended state, the switching piece 31 rotates in the second rotation direction R2 from the state on the first region S1 side in FIG.

水平揺動する作業部１１の回動支点である支点軸４１と同軸に配した切換片３１と、作業アーム１６の他端側で回動自由に取り付けたガイドロッド保持部２３の間にバネである付勢体２２を配置している。切換片３１に設けた切欠きの終端である規制部３３と、作業部１１を支持するフレームＧに固定された回動規制体４２が接触することで切換片３１の回動が規制され、作業部１１が第１回動方向か第２回動方向のいずれか一方側へ付勢される。 A spring biasing body 22 is disposed between a switching piece 31 arranged coaxially with a fulcrum shaft 41 that is the pivot point of the horizontally swinging working unit 11, and a guide rod holding part 23 that is attached to the other end of the working arm 16 so that it can rotate freely. The rotation of the switching piece 31 is restricted by contact between a restricting part 33, which is the end of a notch provided in the switching piece 31, and a rotation restricting body 42 fixed to a frame G that supports the working unit 11, and the working unit 11 is biased in either the first rotation direction or the second rotation direction.

障害物、この実施例ではガードレールＤの支柱Ｄ２は、支点軸４１を境にした第１領域Ｓ１あるいは第２領域Ｓ２のいずれか一方を通過する。障害物が衝突した場合の作業部１１は、付勢体２２（バネ）の付勢に抗して元の位置から後方へ押されて後方側に移動する回避動作をする。回避後は付勢体２２（バネ）の付勢力により、作業部１１は、再び元の位置である第１の復帰位置または第２の復帰位置に復帰する。 An obstacle, in this embodiment, a support post D2 of a guardrail D, passes through either a first area S1 or a second area S2, which are separated by a fulcrum axis 41. When an obstacle collides, the working unit 11 performs an avoidance operation in which it is pushed backward from its original position against the force of the biasing body 22 (spring) and moves backward. After avoidance, the biasing force of the biasing body 22 (spring) causes the working unit 11 to return to its original position, the first return position or the second return position.

作業部１１を一定以上の手で押す又は自重等外力で他方側の回動範囲の終端付近まで揺動させると、バネである付勢体２２が最縮を経て支点越えする。これにより、切換片３１が接触する規制部３３が、第１規制部３４から第２規制部３５へ切り替わり、あるいは、第２規制部３５から第１規制部３４へ、切り換わり、切換片３１が他方へ回動する。
作業部１１は付勢体２２の付勢方向が反転することで付勢される方向が切り換わる。他方側の規制部３３が回動規制体４２に接触し、作業部１１が他方側へ付勢された状態が維持される。 When the working unit 11 is pushed by hand by a certain amount or swung by an external force such as its own weight to the end of the rotation range on the other side, the biasing body 22, which is a spring, contracts to the maximum and exceeds the fulcrum. As a result, the restricting portion 33 with which the switching piece 31 comes into contact switches from the first restricting portion 34 to the second restricting portion 35, or from the second restricting portion 35 to the first restricting portion 34, and the switching piece 31 rotates to the other side.
The biasing direction of the working unit 11 is switched by reversing the biasing direction of the biasing body 22. The restricting portion 33 on the other side comes into contact with the rotation restricting body 42, and the state in which the working unit 11 is biased to the other side is maintained.

図１０に図示するのは、この発明の実施例に係る草刈装置Ｅの平面図である。草刈装置Ｅを、走行機体Ａ及び伸縮手段Ｃに取り付けた状態を示す。障害物であるガードレールＤの支柱Ｄ２が第１領域Ｓ１にある状態である。
図１１に図示するのは、この発明の実施例に係る草刈装置Ｅの、図１０に図示する状態の背面図である。草刈装置Ｅを、走行機体Ａ及び伸縮手段Ｃに取り付けた状態を示す。障害物であるガードレールＤの支柱Ｄ２が第１領域Ｓ１にある状態である。 10 is a plan view of a grass cutting device E according to an embodiment of the present invention. The grass cutting device E is shown attached to a traveling body A and an expandable means C. In this state, a post D2 of a guardrail D, which is an obstacle, is in the first area S1.
Figure 11 is a rear view of the grass mowing device E according to the embodiment of the present invention in the state shown in Figure 10. The grass mowing device E is shown attached to the traveling body A and the telescopic means C. In this state, the post D2 of the guardrail D, which is an obstacle, is in the first area S1.

図１２に図示するのは、この発明の実施例に係る草刈装置Ｅの平面図である。草刈装置Ｅを、走行機体Ａ及び伸縮手段Ｃに取り付けた状態を示す。障害物であるガードレールＤの支柱Ｄ２が第２領域Ｓ２にある状態である。
図１３に図示するのは、この発明の実施例に係る草刈装置Ｅの、図１２に図示する状態の背面図である。草刈装置Ｅを、走行機体Ａ及び伸縮手段Ｃに取り付けた状態を示す。障害物であるガードレールＤの支柱Ｄ２が第２領域Ｓ２にある状態である。 12 is a plan view of the grass cutting device E according to an embodiment of the present invention. The grass cutting device E is shown attached to the traveling body A and the telescopic means C. In this state, the post D2 of the guardrail D, which is an obstacle, is in the second area S2.
Figure 13 is a rear view of the grass mowing device E according to the embodiment of the present invention in the state shown in Figure 12. The grass mowing device E is shown attached to the traveling body A and the telescopic means C. In this state, the post D2 of the guardrail D, which is an obstacle, is in the second area S2.

図１４に図示するのは、この発明の実施例に係る草刈装置Ｅの背面図である。走行機体Ａ及び伸縮手段Ｃに取り付けた状態を示す。伸縮手段Ｃの先端部に設けた水平軸Ｃ１で草刈装置Ｅを、第１領域Ｓ１側を上方に向けて実線で示すように回動させ、外力である作業部の自重によって、作業部１１を破線であらわした第１領域Ｓ１にある状態から、実践であらわした第２領域Ｓ２にある状態に、矢示するように、回動させた様子を示す。 Figure 14 shows a rear view of the grass cutting device E according to an embodiment of the present invention. It shows the state in which it is attached to the traveling body A and the telescopic means C. The grass cutting device E is rotated with the first area S1 side facing upward as shown by the solid line by the horizontal axis C1 provided at the tip of the telescopic means C, and the state in which the working unit 11 is rotated from the state in the first area S1 shown by the dashed line to the state in the second area S2 shown by the solid line by the weight of the working unit, which is an external force, as shown by the arrow.

この発明の実施例では、作業部１１を回動支点部に対して一方側（第１領域Ｓ１）である進行方向左側の左出し状態と、他方側（第２領域Ｓ２）である進行方向右側の右出し状態とを、バネである付勢体２２による付勢方向の切替えによって選択が可能となる。
この発明の実施例では、付勢体２２の付勢方向の切換によって、障害物である支柱Ｄ２の進行方向に対する左右両側から作業部１１を到達させて作業が出来る。 In this embodiment of the invention, the working unit 11 can be positioned to the left, on one side (first region S1) of the pivot point in the direction of travel, or to the right, on the other side (second region S2) in the direction of travel, by switching the biasing direction of the biasing body 22, which is a spring.
In this embodiment of the invention, by switching the biasing direction of the biasing body 22, the working unit 11 can reach both the left and right sides of the direction of travel of the pillar D2, which is an obstacle, and perform work.

この発明の実施例では、作業部１１の第１領域Ｓ１及び第２領域Ｓ２のいずれか一方への突出をさせる場合、各部品の交換作業や、組み換え、着脱を要さずに付勢する方向を切り換えるので、作業者は容易に作業部１１の作業領域の切り換えができる。 In this embodiment of the invention, when the working unit 11 is caused to protrude into either the first area S1 or the second area S2, the direction of the force is switched without the need to replace, reassemble, or remove each part, so the worker can easily switch the working area of the working unit 11.

この発明の実施例である草刈装置Ｅを機枠Ｂあるいは機枠Ｂに備えた伸縮手段Ｃに水平軸周りに回動駆動可能に取り付けた場合、草刈装置Ｅを上下方向に回動させ、鉛直軸４１１である支点軸４１が水平に近づくと、即ち、草刈装置Ｅが鉛直状態に近づくと、作業部１１は作業部１１の自重によって付勢体２２（バネ）の付勢力に抗して、他方側に回動する。この時、切換片３１の回動規制体４２が接触する規制部３３も他方側に切り換わり、作業部１１の付勢方向が切り換わる。このため、作業者は草刈装置Ｅに触れることなく、作業部１１の作業領域の切り換えを完了させることができる。 When the grass cutting device E according to the embodiment of the present invention is attached to the machine frame B or the expansion means C provided on the machine frame B so that it can be rotated around a horizontal axis, the grass cutting device E is rotated in the vertical direction, and when the fulcrum shaft 41, which is the vertical shaft 411, approaches horizontal, that is, when the grass cutting device E approaches a vertical state, the working unit 11 rotates to the other side against the biasing force of the biasing body 22 (spring) due to its own weight. At this time, the restricting part 33, which the rotation restricting body 42 of the switching piece 31 comes into contact with, also switches to the other side, and the biasing direction of the working unit 11 switches. Therefore, the operator can complete the switching of the working area of the working unit 11 without touching the grass cutting device E.

この発明の実施例では、一方側（第１回動方向Ｒ１）と他方側（第２回動方向Ｒ２）に１つの作業部１１の突出方向を、１つの付勢体２２（バネ）で切り換えるとともに、一方側（第１回動方向Ｒ１）と他方側（第２回動方向Ｒ２）のそれぞれに付勢が可能であるため、草刈装置Ｅの簡略化ができる。
すなわち、草刈装置Ｅ全体が軽量化につながり、走行機体Ａの重心バランスが良好となる。 In an embodiment of the present invention, the protruding direction of one working part 11 can be switched between one side (first rotation direction R1) and the other side (second rotation direction R2) by one biasing body 22 (spring), and biasing can be performed to both one side (first rotation direction R1) and the other side (second rotation direction R2), thereby simplifying the grass cutting device E.
In other words, the overall weight of the grass cutting device E is reduced, and the center of gravity of the traveling body A is well balanced.

この発明の実施例では、付勢体２２の力に抗して、作業部１１及び作業アーム１６を、強制的に外力を加えて回動させることで、作業部１１の突出方向が切り替わる。この作業部１１の突出方向を切り換え時は、部品の組み換えや着脱作業が不要であるため、機構が簡便で作業者が扱いやすい。
また、作業部１１の突出方向の切り換え操作は、草刈装置Ｅを水平軸周りに回動するロール角度を操作することで、自重により作業部１１が回動し、作業部１１の突出方向を切り替えることも可能。すなわち、自重による回動方向への力を外力とすることで、より簡単に切り換えることができる。 In the embodiment of the present invention, the protruding direction of the working unit 11 is switched by forcibly applying an external force to the working unit 11 and the working arm 16 to rotate them against the force of the biasing body 22. When switching the protruding direction of the working unit 11, no reassembly or attachment/detachment of parts is required, so the mechanism is simple and easy for the worker to handle.
In addition, the protruding direction of the working unit 11 can be switched by manipulating the roll angle at which the grass cutting device E rotates around the horizontal axis, causing the working unit 11 to rotate under its own weight, thereby switching the protruding direction of the working unit 11. In other words, by using the force in the rotation direction due to its own weight as an external force, switching can be made even easier.

この発明の実施例では、作業部１１の第１領域Ｓ１または第２領域Ｓ２への突出方向の選択が可能であるので、走行機体Ａの進行方向は同一で障害物の手前側と奥側の両方向へのアプローチが可能となる。したがって、障害物に対して、走行機体Ａの陰になっている部分での作業（草刈作業）か可能となる。 In this embodiment of the invention, the direction of the working unit 11's projection into the first area S1 or the second area S2 can be selected, so the traveling direction of the traveling body A is the same and it is possible to approach the obstacle in both directions, in front of and behind it. Therefore, it is possible to work on the part of the obstacle that is shaded by the traveling body A (grass cutting work).

この発明の実施例では、作業部１１及び作業アーム１６は複数個を備えずとも１つ備えれば良いので、装置全体の構成が簡略化でき、装置の大型化の抑制に寄与する。すなわち、走行機体Ａの重心バランスを良好に保つことができる。また、障害物に対して一方側にだけ走行機体Ａを配置するだけでよいので、障害物の周囲の走行路面に左右されることを抑制しながらも、障害物の周囲での作業が可能となる。 In this embodiment of the invention, only one working unit 11 and one working arm 16 is required instead of multiple units, which simplifies the overall configuration of the device and contributes to preventing the device from becoming too large. In other words, the center of gravity balance of the traveling body A can be maintained well. In addition, since it is only necessary to place the traveling body A on one side of the obstacle, it is possible to work around the obstacle while reducing the influence of the traveling road surface around the obstacle.

１６作業アーム
２２付勢体
３１切換片
４１支点軸
４２回動規制体
Ｓ１第１領域
Ｓ２第２領域
Ｅ草刈装置

16 Working arm 22 Pressurizing body 31 Switching piece 41 Pivot shaft 42 Rotation restricting body S1 First region S2 Second region E Grass cutting device

Claims

A working unit that is attached to the traveling body and travels;
A working arm attached to the working unit;
A fulcrum shaft for rotatably mounting the working unit to the frame by rotatably mounting one end of the working arm to the frame provided on the traveling machine body side;
A switching piece that is attached to the fulcrum shaft and has a wide shape that spreads from the attachment point to the fulcrum shaft;
a rotation restricting body provided on the frame side and contacting the working arm to restrict movement of the working arm;
a restricting portion provided on the wide portion of the switching piece and configured to guide the rotation restricting body;
a guide rod holding portion provided on the working arm toward the other end of the working arm from the attachment point of the fulcrum shaft;
a guide rod fulcrum portion provided at a position different from the position where the restriction portion of the wide portion of the switching piece is provided;
a guide rod having one end rotatably attached to the guide rod fulcrum portion and the other end slidably attached to the guide rod holding portion;
A grass cutting device having a biasing body that is installed between a guide rod fulcrum portion of a guide rod and a guide rod holding portion and biases the guide rod fulcrum portion and the guide rod holding portion,
the working arm having one side rotatably attached to the switching piece which is rotatably attached to the fulcrum shaft, and the other side of which is movable by rotation between a first region and a second region which are regions bounded by a line passing through the fulcrum shaft and parallel to the direction of travel;
a rotation restricting body that is disposed near a fulcrum axis of the switching piece and restricts rotation of the working arm by contacting the working arm;
a biasing body that projects the working arm into either the first region or the second region and biases the working arm toward either the first region or the second region;
A grass cutting device comprising:

a switching piece provided on the switching piece so as to be rotatable about the fulcrum shaft as a rotation center, and having a restricting portion capable of restricting rotation by contacting the rotation restricting body,
The restricting portion includes a first restricting portion that restricts rotation of the switching piece in a first rotation direction, which is a direction in which the switching piece rotates toward the first region;
a second restriction portion that restricts rotation of the switching piece in a second rotation direction, which is a direction in which the switching piece rotates toward the second region;
The grass cutting device according to claim 1, further comprising:

When an external force is applied from the first region side to the second region side against the biasing force of the biasing body, the position of the working arm is switched to be located on the second region side,
When an external force is applied from the second area side to the first area side against the biasing force of the biasing body, the position of the working arm is switched to be located on the first area side.
3. The grass cutting device according to claim 1 or 2.

When the working arm positioned on the first region side is moved to the second region side, the rotation restricting body comes into contact with the first restricting portion to restrict the rotation of the switching piece in the first rotation direction,
When the working arm located on the second region side is moved toward the first region side, the rotation restricting body comes into contact with the second restricting portion to restrict the rotation of the switching piece in the second rotation direction.
4. The grass cutting device according to claim 2 or 3.

The fulcrum shaft is provided at the tip of the machine frame and the telescopic means attached to the traveling machine body.
5. The grass cutting device according to claim 1, 2, 3 or 4.

The switching piece is fan-shaped, a fulcrum shaft is attached to the apex of the fan, and a guide rod fulcrum portion and a regulating portion are provided near different ends of the fan, respectively.
A grass cutting apparatus according to any one of claims 1 to 5.

the restricting portion is provided in the shape of a long hole near one wide end of the switching piece to guide the rotation restricting body, and a first restricting portion that restricts rotation in a first rotation direction in which the switching piece rotates towards the first region and a second restricting portion that restricts rotation in a second rotation direction in which the switching piece rotates towards the second region are provided at both ends of the long hole, respectively;
A grass cutting apparatus according to any one of claims 1 to 6, wherein the grass cutting apparatus is a grass cutting apparatus.

a guide rod fulcrum portion provided at an end portion of the wide portion of the switching piece different from the end portion where the regulating portion is provided, and to which a tip end of the guide rod is attached;
A grass cutting apparatus according to any one of claims 1 to 7, wherein the grass cutting apparatus is a grass cutting apparatus.