JPS6112181Y2 - - Google Patents
Info
- Publication number
- JPS6112181Y2 JPS6112181Y2 JP1980153913U JP15391380U JPS6112181Y2 JP S6112181 Y2 JPS6112181 Y2 JP S6112181Y2 JP 1980153913 U JP1980153913 U JP 1980153913U JP 15391380 U JP15391380 U JP 15391380U JP S6112181 Y2 JPS6112181 Y2 JP S6112181Y2
- Authority
- JP
- Japan
- Prior art keywords
- rotary blade
- slide spring
- mounting hole
- rotary
- shaft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000002265 prevention Effects 0.000 claims description 5
- 230000007246 mechanism Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Description
【考案の詳細な説明】
本考案は基端部に原動機を持ち、先端部に回転
刃を設け、原動機より導出されたシヤフトによつ
て回転刃に対して回転力を伝達する如き刈払機に
おける回転刃脱落防止装置に関する。[Detailed description of the invention] This invention has a motor at the base end, a rotary blade at the tip, and a shaft derived from the motor to transmit rotational force to the rotary blade. Regarding a blade fall prevention device.
一般に上記の如き刈払機における回転刃の取付
けは、回転軸に対してネジを用いて締付固定して
いる為、使用中機関の増速又は減速の繰り返しよ
つてゆるみが発生し易く、危険である。よつて従
来より、回転刃の脱落防止機構が種々考えられて
おり、その一例として回転軸に夫々長孔を有する
２枚の回転刃止ワツシヤを嵌合させた機構とか、
ワツシヤに代えて２枚の係合片と、両者を連結す
る爪片によつて固定する機構、更には片側を開放
したスライドスプリング等を用いて、回転刃の下
側に取付け、上下のホルダーによつて固定させた
手段が実施されている。しかるに回転刃止ワツシ
ヤ、係合片等は回転刃の取替え時に着脱に手数を
要し、製作上煩雑であり、片側を開放したスライ
ドスプリングは、取扱いが容易である反面、取替
え時に粉失し易い難点があり、必ずしも満足すべ
き機構が得られなかつた。 Generally, the rotary blade of a brush cutter like the one mentioned above is fixed to the rotary shaft using screws, so it is easy to loosen due to repeated speed increases or decelerations of the engine during use, which is dangerous. be. Therefore, various mechanisms for preventing rotary blades from falling off have been considered in the past, such as a mechanism in which two rotary blade retaining washers each having a long hole are fitted to a rotating shaft.
Instead of a washer, it uses two engaging pieces and a locking mechanism that connects the two, and a slide spring with one side open, which is attached to the lower side of the rotary blade and attached to the upper and lower holders. Therefore, fixed measures are implemented. However, rotary blade stoppers, engaging pieces, etc. require time to attach and detach when replacing the rotary blade, and are complicated to manufacture.Although slide springs with one side open are easy to handle, they are prone to powder loss when replacing them. There were some difficulties, and it was not always possible to obtain a satisfactory mechanism.
本考案は上記に鑑み為されたものであつて、回
転刃の取替、着脱時の操作が極めて容易であり、
操作中粉失する惧れが全く無く、且つ製作コスト
が低廉な上、脱落防止効果も充分に発揮する刈払
機の回転刃脱落防止装置を得る事を目的とするも
のである。 The present invention has been developed in view of the above, and is extremely easy to operate when replacing and attaching/detaching the rotary blade.
To provide a rotary blade fall prevention device for a brush cutter which has no risk of powder being lost during operation, is inexpensive to manufacture, and has a sufficient fall prevention effect.
以下本考案の実施例を図面とともに説明する。
１は原動機（図示せず）よりシヤフトを介して回
転を伝達する駆動伝達部であり、下方に対して回
転軸２が延伸する。軸周部にはスプライン３が設
けられるとともに軸心部にネジ穴４が穿設され、
下方よりボルトガード５及びボルト６が螺挿され
る。尚、スプライン３に代えてキー溝、セレーシ
ヨン構造とするも任意である。７は回転刃であつ
て、円板状周辺に鋸歯部を設けるか、別途の刃体
を取付けて刃部を構成する。８は、上記回転刃を
螺着保持する上部ホルダー、９は同じく下部ホル
ダーであり、ボルト６の締付力によつて回転刃７
を強固に保持する。 Embodiments of the present invention will be described below with reference to the drawings.
Reference numeral 1 denotes a drive transmission unit that transmits rotation from a prime mover (not shown) via a shaft, and a rotating shaft 2 extends downward. A spline 3 is provided on the periphery of the shaft, and a screw hole 4 is bored in the center of the shaft.
The bolt guard 5 and bolt 6 are screwed in from below. It is also possible to use a key groove or serration structure instead of the spline 3. Reference numeral 7 denotes a rotary blade, and the blade portion is formed by providing a sawtooth portion around the disc-shaped periphery or by attaching a separate blade body. Reference numeral 8 designates an upper holder that screws and holds the rotary blade, and 9 designates a lower holder.
hold firmly.
一方、下部ホルダー９の中心部近辺には円形の
凹部１０が設けてあり、該凹部内において、本考
案の主眼とするスライドスプリング１１が係着保
持される。該スライドスプリング１１は回転軸２
の中途部に設けた係合用溝部１２に軸径を乗り越
えて係合保持されて成り、硬鋼線、バネ鋼線等を
採用することによつて容易に抜去不可能に構成さ
れる。 On the other hand, a circular recess 10 is provided near the center of the lower holder 9, and a slide spring 11, which is the main focus of the present invention, is fixed and held within the recess. The slide spring 11 is connected to the rotating shaft 2
It is engaged and held in an engaging groove 12 provided in the middle of the shaft over the shaft diameter, and is constructed so that it cannot be easily removed by employing hard steel wire, spring steel wire, or the like.
第２図は上記スライドスプリング１１の形状例
を示すものであり、全体が閉状態として構成さ
れ、その略中心部において回転軸２の中途に設け
た係合用溝部に係着されるものである。更に該ス
ライドスプリング１１は抜け止め部１１′を設け
てある為、回転軸の半径方向、即ち第２図示のＡ
方向に対して摺動せしめた際に、該回転軸より抜
去する惧れが全くない事を特徴とする。 FIG. 2 shows an example of the shape of the slide spring 11, which is constructed as a whole in a closed state, and is engaged with an engagement groove provided halfway in the rotating shaft 2 at its substantially central portion. Further, since the slide spring 11 is provided with a retaining portion 11', the slide spring 11 is provided with a retaining portion 11', so that the slide spring 11 is provided with a retaining portion 11'.
It is characterized in that there is no risk of it being pulled out from the rotating shaft when it is slid in any direction.
第３図は本考案に適用するスライドスプリング
の他の実施例を示す。本例は鋼板１３から成り、
その略中心部において回転軸２の中途に設けた係
合用溝部に係着されるものであり、抜け止め部１
３′が設けてある為第２図示例の場合と同様にＡ
方向に対して摺動せしめた際に回転軸より抜去す
る惧れがない。 FIG. 3 shows another embodiment of the slide spring applied to the present invention. This example consists of a steel plate 13,
It is engaged in an engagement groove provided in the middle of the rotating shaft 2 at approximately the center thereof, and the retaining portion 1
3' is provided, so as in the case of the second illustrated example, A
There is no risk of it being removed from the rotating shaft when it is slid in any direction.
スライドスプリング１１は、第１図示の如く係
着保持せしめた際に、回転刃７の脱落防止機能を
有するものであり、その為にその全長が回転刃７
の中心に穿設した取付孔の直径よりも大である事
が要求される。上記の長さを有する事によつてボ
ルト６の弛みにより下部ホルダー９が落下した際
にも回転刃７がスライドスプリング１１に懸着し
て脱落を防ぎ、作業者に対する危険性が防止され
る。そして、スライドスプリング１１を第２図示
のＡ方向に摺動させ回転刃７を傾けた時、第４図
に示す如く、回転刃７の取付孔の一端７ａが回転
軸２の軸端２ａを乗り越える位置で、該取付孔の
反対側７ｂがスライドスプリング１１の端部１
１″と干渉しないよう該取付孔の反対側７ｂと該
スライドスプリング１１の端部１１″の間にスプ
リング１１が短い場合に回転刃７の取り外しを容
易とする回転刃７の取付け孔の反対側７ｂとスラ
イドスプリング１１の端部１１″との間隙Ｈ及び
スプリング１１が長い場合に回転刃７の取り外し
を容易とする回転刃７の取付け孔の反対側７ｂと
スライドスプリング１１の端部１１″とを結ぶ取
り出し方向の間隙Ｃを設けたことによりスライド
スプリング１１を脱着することなく回転刃７を脱
着できるようにした事を特徴とする。 The slide spring 11 has a function of preventing the rotary blade 7 from falling off when the slide spring 11 is engaged and held as shown in FIG.
It is required that the diameter be larger than the diameter of the mounting hole drilled in the center of the By having the above length, even if the lower holder 9 falls due to loosening of the bolt 6, the rotary blade 7 is suspended from the slide spring 11 to prevent it from falling off, thereby preventing danger to the operator. When the slide spring 11 is slid in the direction A shown in the second figure and the rotary blade 7 is tilted, one end 7a of the mounting hole of the rotary blade 7 passes over the shaft end 2a of the rotary shaft 2, as shown in FIG. At this position, the opposite side 7b of the mounting hole is located at the end 1 of the slide spring 11.
1" between the opposite side 7b of the mounting hole and the end 11" of the slide spring 11 to facilitate removal of the rotary blade 7 when the spring 11 is short. A gap H between 7b and the end 11'' of the slide spring 11, and a gap H between the end 11'' of the slide spring 11 and the opposite side 7b of the mounting hole of the rotary blade 7, which facilitates removal of the rotary blade 7 when the spring 11 is long. The rotary blade 7 can be attached and detached without attaching and detaching the slide spring 11 by providing a gap C in the removal direction connecting the two.
組立時における回転刃７の取付、及び交換時に
はスライドスプリング１１を第２図示のＡ方向に
引張ることにより、回転軸２の半径方向に対し
て、係合用溝部１２に沿つて摺動し、抜け落ちる
事なく停止する。この状態にすれば回転軸２に対
してスライドスプリング１１が片側に偏位する事
なり、回転刃７を容易に着脱させる事ができる。
尚係合用溝部１２は回転軸に対して円周状に設け
ても良いが、摺動させる為に相対抗する周面上に
のみ局部的に設けても同様な目的を達することが
できる。 By attaching the rotary blade 7 during assembly and pulling the slide spring 11 in the direction A shown in the second figure during replacement, the rotary blade 7 will slide along the engagement groove 12 in the radial direction of the rotary shaft 2 and will not fall off. Stop without any problem. In this state, the slide spring 11 is deviated to one side with respect to the rotary shaft 2, and the rotary blade 7 can be easily attached and detached.
The engagement groove 12 may be provided circumferentially around the rotating shaft, but the same purpose can be achieved even if it is provided locally only on opposing circumferential surfaces for sliding movement.
以上詳細に本考案に係る刈払機の回転刃脱落防
止機能の説明を行つたが、本考案は製造コストの
低廉なスライドスプリングの採用によつて、回転
刃の脱落防止機能を有する上、回転刃の取替、交
換時にスライドスプリングを摺動させて、回転刃
を片側に傾けるだけで回転刃を脱着することがで
きるので組立作業が容易であり、且つ操作時にス
ライドスプリングが外れないようになつているの
で不用意に粉失する惧れが全くない装置を実現す
るものであり、刈払機に適用して有効な手段を提
供するものである。 The function of preventing the rotary blade from falling off of the brush cutter according to the present invention has been explained in detail above.The present invention has a function of preventing the rotary blade from falling off by adopting a slide spring that is inexpensive to manufacture. When replacing or replacing the rotary blade, the rotary blade can be attached and removed by simply sliding the slide spring and tilting the rotary blade to one side, making assembly work easy and preventing the slide spring from coming off during operation. Therefore, it is possible to realize a device in which there is no risk of inadvertently losing powder, and it provides an effective means when applied to a brush cutter.
第１図は本考案の実施例を示す一部破断した断
面図、第２図は本考案に適用するスライドスプリ
ングの形状を示す平面図、第３図はスライドスプ
リングの他の形状例を示す平面図である。第４図
は回転刃を回転刃脱落防止装置から脱着するとき
の説明図である。
１……駆動伝達部、２……回転軸、３……スプ
ライン、４……ねじ穴、５……ボルトガード、６
……ボルト、７……回転刃、８……上部ホルダ
ー、９……下部ホルダー、１０……凹部、１１…
…スライドスプリング、１２……係合用溝部、１
１′，１３′……抜け止め部、１３……鋼板。
Fig. 1 is a partially broken sectional view showing an embodiment of the present invention, Fig. 2 is a plan view showing the shape of a slide spring applied to the present invention, and Fig. 3 is a plan view showing another example of the shape of the slide spring. It is a diagram. FIG. 4 is an explanatory diagram when the rotary blade is attached and detached from the rotary blade drop-off prevention device. 1... Drive transmission unit, 2... Rotating shaft, 3... Spline, 4... Screw hole, 5... Bolt guard, 6
... Bolt, 7 ... Rotating blade, 8 ... Upper holder, 9 ... Lower holder, 10 ... Recess, 11 ...
...Slide spring, 12...Engagement groove, 1
1', 13'... Retaining part, 13... Steel plate.
Claims (1)
係合した上部ホルダー８及び下部ホルダー９の間
に、前記回転軸２のネジに締付けネジ６を螺挿す
ることによつて挾持される着脱自在の回転刃７を
有する刈払機において、前記下部ホルダー９の上
部に凹部を設け、前記回転軸２の該凹部に当たる
中途部に回転刃７の脱着を容易とし、かつ締付け
ネジ６のゆるみによる回転刃７の脱落を防ぐスラ
イドスプリング１１の係合用溝部を設け、前記凹
部内に全長が回転刃７の取付孔の直径よりも大き
く、回転軸２の半径方向に摺動可能で、抜け止め
部１１′を有するスライドスプリング１１を係着
保持せしめ、該スライドスプリング１１を摺動さ
せ、回転刃７を傾けた時、前記回転刃７の取付孔
の一端７ａが前記回転軸２の軸端２ａを乗り越え
る位置で、該取付け孔の反対側７ｂがスライドス
プリング１１の端部１１″と干渉しないよう該取
付け孔の反対側７ｂと該スライドスプリング１１
の端部１１″の間にスプリング１１が短い場合に
回転刃７の取り外しを容易とする回転刃７の取付
け孔の反対側７ｂとスライドスプリング１１の端
部１１″との間隙Ｈ及びスプリング１１が長い場
合に回転刃７の取り外しを容易とする回転刃７の
取付け孔の反対側７ｂとスライドスプリング１１
の端部１１″とを結ぶ取り出し方向の間隙Ｃを設
けたことによりスライドスプリング１１を脱着す
ることなく回転刃７を脱着できるようにした事を
特徴とする刈払機の回転刃脱落防止装置。 A removable device that is held between an upper holder 8 and a lower holder 9 engaged with a spline of a rotating shaft 2 connected to a drive source by screwing a tightening screw 6 into a screw of the rotating shaft 2. In a brush cutter having a rotary blade 7, a recess is provided in the upper part of the lower holder 9, and the rotary blade 7 can be easily attached and removed in the middle part of the rotary shaft 2 corresponding to the recess, and the rotary blade can be removed by loosening the tightening screw 6. A groove for engaging the slide spring 11 to prevent the slide spring 7 from falling off is provided, and a retaining portion 11' is provided in the recess, the entire length of which is larger than the diameter of the mounting hole of the rotary blade 7, and which is slidable in the radial direction of the rotary shaft 2. When the slide spring 11 having a slide spring 11 is engaged and held and the slide spring 11 is slid and the rotary blade 7 is tilted, one end 7a of the mounting hole of the rotary blade 7 is at a position where it passes over the shaft end 2a of the rotary shaft 2. Then, the opposite side 7b of the mounting hole and the slide spring 11 are connected so that the opposite side 7b of the mounting hole does not interfere with the end 11'' of the slide spring 11.
There is a gap H between the end 11'' of the slide spring 11 and a gap H between the opposite side 7b of the mounting hole of the rotary blade 7 and the end 11'' of the slide spring 11, which facilitates the removal of the rotary blade 7 when the spring 11 is short. The opposite side 7b of the mounting hole of the rotary blade 7 and the slide spring 11, which facilitates the removal of the rotary blade 7 when the rotary blade 7 is long.
A rotary blade fall prevention device for a brush cutter, characterized in that a gap C is provided in the take-out direction connecting the end portion 11'' of the rotary blade 7 to the rotary blade 7 so that the rotary blade 7 can be attached and detached without detaching the slide spring 11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1980153913U JPS6112181Y2 (en) | 1980-10-28 | 1980-10-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1980153913U JPS6112181Y2 (en) | 1980-10-28 | 1980-10-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5776432U JPS5776432U (en) | 1982-05-12 |
| JPS6112181Y2 true JPS6112181Y2 (en) | 1986-04-16 |
Family
ID=29513156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1980153913U Expired JPS6112181Y2 (en) | 1980-10-28 | 1980-10-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6112181Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59119128U (en) * | 1983-02-01 | 1984-08-11 | 株式会社クボタ | Mower grass intrusion prevention structure |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5478746U (en) * | 1977-11-15 | 1979-06-04 |
-
1980
- 1980-10-28 JP JP1980153913U patent/JPS6112181Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5776432U (en) | 1982-05-12 |
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