WO2013054880A1 - Rotary blade for lawn mower and lawn mower using same - Google Patents
Rotary blade for lawn mower and lawn mower using same Download PDFInfo
- Publication number
- WO2013054880A1 WO2013054880A1 PCT/JP2012/076432 JP2012076432W WO2013054880A1 WO 2013054880 A1 WO2013054880 A1 WO 2013054880A1 JP 2012076432 W JP2012076432 W JP 2012076432W WO 2013054880 A1 WO2013054880 A1 WO 2013054880A1
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- WIPO (PCT)
- Prior art keywords
- rotary blade
- mounting shaft
- cord
- main body
- holding member
- Prior art date
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D34/00—Mowers; Mowing apparatus of harvesters
- A01D34/01—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
- A01D34/412—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
- A01D34/416—Flexible line cutters
- A01D34/4161—Means for feeding cutter line
Definitions
- the present invention relates to a rotary blade for a mower and a mower using the same.
- This mower is of a type also called a brush cutter, and is configured to transmit the rotational power generated by a small engine to a rotary blade supported at the tip of an operation tube. Or while controlling the rotation of the rotary blade rotated by this, the operation tube is swung to perform a desired mowing operation.
- Patent Document 1 As a rotary blade suitable for this type of portable power mower, there is one disclosed in Patent Document 1.
- the rotary blade shown in the same document is a nylon cord (cord cutting member) type rotary blade, which is attached to the rotary blade mounting shaft of a mower and rotates with the rotary blade mounting shaft to hold the cord cutting member.
- the guide member is characterized in that the holding member is equipped with a guide member that is supported so as to be rotatable about its rotation axis.
- the cord-like cutting member is held by the holding member in a state of being wound around a reel built in the holding member so that the extension length of the cord-like cutting member can be adjusted.
- the base end is connected with the operation member which can be rotated.
- the present invention has been conceived under the circumstances described above, and is an operation for adjusting the length of a cord-like cutting member in a rotary blade for a mower equipped with an extension length adjusting mechanism for the cord-like cutting member.
- the issue is to improve performance.
- the present invention employs the following technical means.
- the rotary blade for mower provided by the first aspect of the present invention includes a holding member that is attached to a rotary blade mounting shaft of a mowing machine and is rotated, a proximal end side is held inside the holding member, and a distal end side is the holding side
- a rotary blade for a mower provided with a cord-shaped cutting member led out radially outward from a lead-out hole provided in the member, wherein the holding member is connected to the mounting shaft and rotates integrally with the mounting shaft
- a base end side of the cord-shaped cutting member that is movable with a predetermined stroke in the axial direction of the mounting shaft with respect to the main body and capable of relative rotation around the mounting shaft.
- An operating portion that is wound and held, an elastic member that urges the operating portion in one axial direction, and the operating portion is in a predetermined position in the stroke by the elasticity of the elastic member. Relative rotation between the operation unit and the main body is prevented, and when the operation unit is moved from the predetermined position against the elasticity of the elastic member, relative rotation between the operation unit and the main body is prevented. And an allowable clutch mechanism.
- the elastic member constantly urges the operation portion upward
- the clutch mechanism is arranged annularly around the attachment shaft and protrudes downward in the main body portion.
- a plurality of first engaging projections, and a plurality of second engagements arranged annularly around the mounting shaft and projecting upward while being able to engage with the plurality of first engaging projections. And a convex portion.
- the plurality of first engaging convex portions and the plurality of second engaging convex portions are inclined in a predetermined direction on the side surfaces in the direction in which they are arranged.
- a guide member that can rotate relative to the holding member about the rotation axis is provided below the holding member.
- the mower provided by the second aspect of the present invention includes a power source and a rotary blade mounting shaft that is rotationally driven by the power of the power source, and the rotary blade mounting shaft includes the first side surface.
- a rotary blade for a mower according to the above is attached.
- the clutch mechanism rotates relative to the main body portion of the holding member. As long as this is prevented, the cord-shaped cutting member is not unintentionally drawn out. Therefore, the extension length of the cord-like cutting member can be adjusted only when the relative rotation of the operation portion with respect to the main body is allowed, and the operability of adjusting the extension length of the cord-like cutting member can be adjusted. Will improve.
- FIG. 1 is an overall perspective view of an example of a rotary blade for a mower according to an embodiment of the present invention and a mower using the same. It is a principal part enlarged view of FIG. It is a longitudinal cross-sectional view of the rotary blade for mowing machines which concerns on one Embodiment of this invention. It is a principal part longitudinal cross-sectional view in the circumferential direction for description of a clutch mechanism. It is a longitudinal cross-sectional view for effect
- FIG. 1 to 6 show an embodiment of a rotary blade for a mower according to the present invention and a mower using the same.
- a small engine 11 as a drive source is connected to the proximal end side of the operation tube 12, and the rotation output is inserted into the operation tube 12.
- the transmission shaft 13 is transmitted to the distal end portion of the operation tube 12.
- an engine having a displacement of about 25 cc is used in consideration of the portability of the operator.
- the small engine 11 may be directly attached to the base end of the operation tube 12, or an engine mounted on a backpack frame, for example, may be connected via a flexible transmission shaft.
- a rotary blade mounting shaft 14 is supported on the gear case 16 at the tip of the operation tube 12, and the rotary blade mounting shaft 14 and the transmission shaft 13 are connected to a bevel gear mechanism ( (Not shown).
- a spline is formed on the outer periphery of the rotary blade mounting shaft 14, and a screw hole 14a extending in the axial direction is formed at the shaft end.
- a rotating blade holder 17 made of metal is splined to the rotating blade mounting shaft 14.
- Rotating blade A characterized by the present invention is mounted on the rotating blade mounting shaft 14.
- the rotary blade A is attached to the rotary blade mounting shaft 14 and rotated, and holds a nylon cord cutting blade 4a as an example of a cord-like cutting member.
- a guide member 200 that can rotate relative to the holding member 100 around its rotation axis (same axis as the rotary blade mounting shaft 14).
- the holding member 100 includes a main body 100a and an operation unit 100b.
- the main body 100a also includes a support piece 110 and a nylon cord storage case 120.
- the support piece 110 includes a boss portion 111 having a center hole 111a that can be fitted into the lower circular bulging portion 17a of the rotary blade retainer 17, and a flange portion 112 that extends radially outward from the boss portion 111. Formed of resin.
- a first engagement convex portion 161 constituting a clutch mechanism 160 described later is formed on the lower surface of the flange portion 112, which will be described later.
- the nylon cord housing case 120 includes a boss portion 121 having a center hole 121a and an annular housing portion 122 connected to the outer periphery of the boss portion 121, and is formed by resin integral molding, for example.
- the boss portion 121 has the same outer diameter as the outer diameter of the boss portion 111 of the support piece 110, and a circular bulging portion 121 b that fits into the center hole 111 a of the support piece 110 is formed on the upper surface.
- a cylindrical portion 121 c is integrally extended on the lower surface of the boss portion 121.
- the housing portion 122 includes a cylindrical inner peripheral wall 122a, a donut disk-shaped bottom wall 122b extending horizontally from the lower end of the inner peripheral wall 122a, and a cylindrical outer peripheral wall 122c extending vertically upward from the outer peripheral portion of the bottom wall 122b. Is formed in a groove shape that is open at the top.
- the operation part 100b integrally has a cover part 130 positioned so as to close the upper open part of the housing part 122 of the nylon cord housing case 120, and a cord holding part 140 for winding and holding the nylon cord 4.
- the support piece 110 is fitted to the outer periphery of the boss portion 111 of the support piece 110 or the outer periphery of the boss portion 121 of the nylon cord housing case 120 so as to be rotatable and slidable in the vertical direction.
- the operation part 100b can be formed by resin molding, in this embodiment, for convenience of molding, the cover part 130 and the cord holding part 140 are separately molded and then integrated.
- the cover portion 130 is made of a resin having a donut disk shape as a whole, and a stepped portion 131 is formed on the upper surface on the inner peripheral side, and the upper surface of the stepped portion 131 cooperates with the first engaging convex portion 161 described above.
- a second engagement convex portion 162 that works to constitute the clutch mechanism 160 is formed.
- the outer peripheral part of the cover part 130 is a thin dust-proof wall 132 that goes around from the upper part of the outer peripheral wall 122c of the housing part 122 to the outside, leaving a margin for the operation part 100b to move downward.
- a knurl 133 is formed on the outer periphery of the dust-proof wall 132, and the knurl 133 prevents slipping when the operation unit 100b is rotated.
- the cord holding part 140 has a cylindrical body part 141 whose upper end is connected to the lower surface near the inner periphery of the cover part 130, and an outward flange part 142 connected to the lower end of the cylindrical body part 141. In cooperation with, a cord winding portion 143 in the form of an annular groove that opens in the lateral direction is formed.
- the cord holding portion 140 is integrated with the cover portion 130 by fitting an upper portion thereof to a cylindrical portion 134 formed on the inner periphery of the cover portion 130.
- the upper end is an appropriate part of the cord holding part 140 and the lower end is A compression coil spring 150 is incorporated so as to elastically contact the bottom wall 122b of the housing portion 122, whereby the operation portion 100b is always urged upward.
- the clutch mechanism 160 is formed by the plurality of first engagement convex portions 161 provided on the support piece 110 and the plurality of second engagement convex portions 162 provided on the cover portion 130.
- the first engagement protrusions 161 are arranged in an annular shape with a space in which the second engagement protrusions 162 can be fitted, and the second engagement protrusions 162 are formed as the first engagement protrusions 161. They are arranged in an annular region that overlaps the region in the vertical direction. Further, the side surfaces 161a and 162a of the first engaging portion 161 and the second engaging convex portion 162 that are in contact with each other are inclined as shown in FIG.
- the direction of the inclination of the side surfaces 161a and 162a is the direction deviating from the rotational drive direction indicated by N in FIG. 4 toward the tip (downward) as far as the first engagement convex portion 161a is concerned.
- the top surface 161b of the first engaging convex portion 161 and the top surface 162b of the second engaging convex portion 162 are horizontal flat surfaces, and as shown in FIG. 6, the two top surfaces 161b and 162b are connected to each other.
- the operation unit 100b can slide relative to the support piece 110 by sliding in a resilient contact state with each other.
- nylon cord lead-out holes 123 are formed at two locations facing the diameter direction of the housing part 122.
- a collar 125 made of a hard material having excellent wear resistance is fitted into a hole 124 formed in the outer peripheral wall 122c.
- An annular convex portion 126 is formed on the bottom wall 122b of the housing portion 122 to prevent the nylon cord 4 from entering the gap between the bottom wall 122b and the outward flange portion 142 of the cord holding portion 140. .
- a pair of circumferentially adjacent holes 1135 are formed at appropriate positions of the cover portion 130, and the nylon cord 4 is substantially passed through these holes 135 in the vicinity of the center thereof.
- the two nylon cords 4 are wound around the groove-like cord winding portion 143 and are accommodated in the housing portion 122 of the nylon cord housing case 120.
- the leading end sides of the two nylon cords 4 are led out to the outside from nylon cord lead-out holes 123 formed in two locations so as to face the nylon cord housing case 120 in the diametrical direction.
- the side functions as the nylon cord cutting blade 4a.
- the guide member 200 includes a center tube portion 211 and a disk portion 220 extending from the lower end of the center tube portion 211.
- the disk portion 220 extends horizontally to the vicinity corresponding to the outer periphery of the holding member 100, and The outer peripheral side is displaced upward.
- the inner peripheral part of the center cylinder part 211 and the disk part 220 is formed of metal, and the remaining part of the disk part 220 is formed of resin.
- the integration of the metal portion and the resin portion can be performed by an insert molding method.
- Two bearings 230 stacked in the axial direction are held on the inner surface of the central cylindrical portion 211 of the guide member 200 by press-fitting the outer ring 231.
- the guide member 200 is configured so that the inner ring 232 of the upper bearing 230 is in contact with the lower surface of the cylindrical portion 121c of the nylon cord housing case 120 and the center hole 121a of the boss portion 121 of the bearing 230 and the nylon cord housing case 120.
- the bolt 15 that has passed through is screwed into the screw hole 14 a of the rotary blade mounting shaft 14, so that the bolt 15 is supported so as to be relatively rotatable about its axis (axis of the rotary blade mounting shaft 14).
- the support piece 110 and the nylon cord housing case 120 are integrated with the rotary blade mounting shaft 14.
- the nylon cord cutting blade 4a is gradually shortened due to wear.
- the extension length of the nylon cord cutting blade 4a can be extended as follows. That is, the operating portion 100b is pushed down against the urging force of the compression coil spring 150 to release the engagement between the first engaging convex portion 161 and the second engaging convex portion 162, and the operating portion 100b is moved out of the nylon cord 4. Then, the operating portion 100b is moved upward by the elasticity of the compression coil spring 150 to engage the first engaging convex portion 161 and the second engaging convex portion 162. Thereby, the extension length of the nylon cord cutting blade 4a is extended by the amount fed from the cord winding portion 143.
- the nylon cord is cut by the following operation.
- the extending length of the blade 4a can be extended. That is, when the operation portion 100b is pushed downward, the operation portion 100b is moved to the main body portion 100a by the slope effect of the mutual contact side surfaces 161a and 162a of the first engagement convex portion 161 and the second engagement convex portion 162. It moves downward while rotating relative to (support piece 110).
- the operating portion 100b is slightly moved by the return elastic force in the rotational direction of the compression coil spring 150.
- the top surface 162 b of the second engagement convex portion 162 is placed on the top surface 161 b of the first engagement convex portion 161.
- the cord-like cutting member 4a is pulled outward, the top surfaces 161b and 162b of the first engagement convex portion 161 and the second engagement convex portion 162 slide to rotate, and the operation portion 100b is rotated.
- the first engagement convex portion 161 and the second engagement convex portion 162 are automatically engaged by the elasticity of the compression coil spring 150.
- the extension length of the nylon cord cutting blade 4a is extended by the amount that the nylon cord 4 is fed out by rotating the operation portion 100b.
- the holding member 100 of the rotary blade A is rotated by the rotational output of the engine 11.
- the nylon cord cutting blade 4a is rotated.
- the rotational output of the engine 11 is decelerated from the transmission shaft 13 by a bevel gear (not shown) in the gear case 16, and is transmitted to the holding member 100 or the nylon cord cutting blade 4a via the rotary blade mounting shaft 14.
- the number of rotations of the holding member 100 or the nylon cord cutting blade 4a reaches, for example, 5,000 to 6,300 rpm.
- the outer diameter of the rotary blade A (the outer diameter of the guide member 200) is, for example, 300 mm, the peripheral speed of the tip portion of the nylon cord cutting blade 4a will easily reach 350 km / h.
- this rotary blade A is moved along the ground, relatively soft and thin objects such as weeds are prevented from entering further inward in the radial direction by the guide member 200, and nylon that turns at a high speed. It receives a strong collision from the lateral direction by the cord cutting blade 4a and is cut without difficulty by the impact.
- the nylon cord cutting blade 4a has a diameter of about 3 mm at most and is lightweight, but the peripheral speed of the tip is extremely high as described above, so that it is necessary to cut soft weeds and other stems. It has enough kinetic energy.
- the extension length of the nylon cord cutting blade 4a can be easily extended by simply rotating the nylon cord 4 in the feeding direction and engaging the first engagement convex portion 161 and the second engagement convex portion 162 again. , As described above. Moreover, since the operation part 100b has the cord winding part 143 integrally, during the high speed rotation of the rotary blade A, the nylon cord cutting blade 4a is not unintentionally fed out as described above. It is as follows.
- the clutch mechanism 160 is released by moving the operation unit 100b downward, but the clutch mechanism may be released by moving the operation unit upward.
- the operation unit and the cord winding unit may be configured integrally.
- the guide member 200 that can rotate relative to the holding member 100 or the rotary blade mounting shaft 14 is also provided, and whether or not the guide member 200 is provided is a matter of choice.
- the mowing machine to which the rotary blade A of the present invention is attached is not limited to the one having the rotary blade mounting shaft 14 at the tip of the operation tube 12 as shown in FIG.
- the rotary blade of the present invention can also be attached to a so-called self-propelled mower having a power source such as an engine and a rotary blade mounting shaft that is rotationally driven by the power source on a frame that can move on the ground. it can.
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Abstract
A rotary blade (A) for use in a lawn mower, said rotary blade being provided with the following: a retention member (100) that is attached to an attachment shaft (14) and rotated; and a cord-shaped cutting member (4a), the base end of which is held inside the retention member (100). The retention member (100) is provided with a main body (100a) coupled to the attachment shaft (14), manipulable parts (100b) that hold the base end of the cord-shaped cutting member in a wound manner, and a clutch mechanism (160). The manipulable parts (100b) are combined so as to be manipulable so as to produce relative rotation and movable, as part of a prescribed stroke, in the axial direction of the attachment shaft (14) relative to the main body (100a). The clutch mechanism (160) prevents relative rotation between the manipulable parts (100b) and the main body (100a) when the manipulable parts (100b) are at a given position in the aforementioned stroke as a result of the elastic restoring force of an elastic member (150), but permits relative rotation between the manipulable parts (100b) and the main body (100a) when the manipulable parts (100b) have been moved from said given position against the elastic restoring force of the elastic member (150).
Description
本発明は、草刈り機用回転刃およびこれを用いた草刈り機に関する。
The present invention relates to a rotary blade for a mower and a mower using the same.
田畑の土手等に生育する雑草等を除去するための器具として、携帯型動力草刈り機がある。この草刈り機は、刈払機とも呼ばれるタイプのものであり、小型エンジンによって発生させられる回転動力を操作管の先端に支持させた回転刃に伝えるように構成されており、作業者は、スロットルレバーによってエンジンないしこれによって回転させられる回転刃の回転を制御しつつ、操作管を振回して所望の草刈り作業を行なう。
There is a portable power mower as a tool for removing weeds growing on the bank of the field. This mower is of a type also called a brush cutter, and is configured to transmit the rotational power generated by a small engine to a rotary blade supported at the tip of an operation tube. Or while controlling the rotation of the rotary blade rotated by this, the operation tube is swung to perform a desired mowing operation.
この種の携帯型動力草刈り機に適した回転刃として、特許文献1に示されたものがある。同文献に示された回転刃は、ナイロンコード(コード状切断部材)式の回転刃であり、草刈り機の回転刃取付け軸に取付けられて、回転刃取付け軸とともに回転し、コード状切断部材を保持する保持部材に加え、この保持部材に対してその回転軸を中心として回転可能に支持されたガイド部材を装備している点に特徴づけられる。
As a rotary blade suitable for this type of portable power mower, there is one disclosed in Patent Document 1. The rotary blade shown in the same document is a nylon cord (cord cutting member) type rotary blade, which is attached to the rotary blade mounting shaft of a mower and rotates with the rotary blade mounting shaft to hold the cord cutting member. In addition to the holding member, the guide member is characterized in that the holding member is equipped with a guide member that is supported so as to be rotatable about its rotation axis.
上記構成を備える特許文献1の回転刃においては、ガイド部材には回転刃取付け軸からの回転力が伝達されないので、たとえば、ガイド部材が地面に接した状態においてはこのガイド部材が回転せず、保持部材のみが高速回転をする。そして、雑草等の切断対象は、ガイド部材により、このガイド部材の外周よりも内方への進入が阻止されるので、高速旋回するコード状切断部材の先端部分によって効率的に切断されるという優れた機能を有する。
In the rotary blade of Patent Document 1 having the above configuration, since the rotational force from the rotary blade mounting shaft is not transmitted to the guide member, for example, when the guide member is in contact with the ground, the guide member does not rotate, Only the holding member rotates at high speed. The cutting target such as weeds is effectively cut by the distal end portion of the cord-like cutting member that turns at high speed because the guide member prevents the guide member from entering inward from the outer periphery of the guide member. It has a function.
また、特許文献1の回転刃においては、コード状切断部材の延出長さを調節できるように、このコード状切断部材は、保持部材に内装されたリールに巻かれた状態で保持部材に保持され、その基端が回転操作可能な操作部材に連結されている。
Moreover, in the rotary blade of Patent Document 1, the cord-like cutting member is held by the holding member in a state of being wound around a reel built in the holding member so that the extension length of the cord-like cutting member can be adjusted. And the base end is connected with the operation member which can be rotated.
しかしながら、リールは、操作部材に直接連携されているわけではないので、この回転刃の実際の使用にあたっては、回転刃の高速回転にともなう遠心力によって、リールに巻かれたコード状切断部材が繰り出されてしまうことが判明した。このような事態を防止するためには、リールを保持部材に対して固定状態とする対策を講じるほかはなく、特許文献1の回転刃は、コード状切断部材の延出長さを調節できる機構の操作性において難点があった。
However, since the reel is not directly linked to the operation member, in actual use of the rotary blade, the cord-shaped cutting member wound around the reel is fed out by the centrifugal force accompanying the high-speed rotation of the rotary blade. Turned out to be. In order to prevent such a situation, there is no other way than to take measures to fix the reel to the holding member. The rotary blade of Patent Document 1 is a mechanism that can adjust the extension length of the cord-shaped cutting member. There was a difficulty in operability.
本発明は、上記した事情のもとで考え出されたものであって、コード状切断部材の延出長さ調節機構を備えた草刈り機用回転刃において、コード状切断部材の長さ調整の操作性を向上させることをその課題としている。
The present invention has been conceived under the circumstances described above, and is an operation for adjusting the length of a cord-like cutting member in a rotary blade for a mower equipped with an extension length adjusting mechanism for the cord-like cutting member. The issue is to improve performance.
上記課題を解決するため、本発明では、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.
本発明の第1の側面によって提供される草刈り機用回転刃は、草刈り機の回転刃取付け軸に取付けられて回転させられる保持部材と、上記保持部材の内部に基端側が保持され、先端側が当該保持部材に設けた導出孔から半径方向外方に導出させられるコード状切断部材と、を備えた草刈り機用回転刃であって、上記保持部材は、上記取付け軸に連結されてこの取り付け軸と一体回転する本体部と、上記本体部に対して上記取付け軸の軸方向に所定のストロークで移動可能かつ上記取付け軸周りに相対回転操作可能に組み合わされ、かつ、上記コード状切断部材の基端側を巻回保持する操作部と、上記操作部を上記軸方向の一方方向に付勢する弾性部材と、上記操作部が上記弾性部材の弾力によって上記ストロークにおける所定位置にあるときこの操作部と上記本体部との相対回転を阻止するとともに、上記操作部が上記弾性部材の弾力に抗して上記所定位置から移動させられたときこの操作部と上記本体部との相対回転を許容するクラッチ機構と、を備えることを特徴とする。
The rotary blade for mower provided by the first aspect of the present invention includes a holding member that is attached to a rotary blade mounting shaft of a mowing machine and is rotated, a proximal end side is held inside the holding member, and a distal end side is the holding side A rotary blade for a mower provided with a cord-shaped cutting member led out radially outward from a lead-out hole provided in the member, wherein the holding member is connected to the mounting shaft and rotates integrally with the mounting shaft And a base end side of the cord-shaped cutting member that is movable with a predetermined stroke in the axial direction of the mounting shaft with respect to the main body and capable of relative rotation around the mounting shaft. An operating portion that is wound and held, an elastic member that urges the operating portion in one axial direction, and the operating portion is in a predetermined position in the stroke by the elasticity of the elastic member. Relative rotation between the operation unit and the main body is prevented, and when the operation unit is moved from the predetermined position against the elasticity of the elastic member, relative rotation between the operation unit and the main body is prevented. And an allowable clutch mechanism.
好ましい実施の形態では、上記弾性部材は、上記操作部を上方に向けて常時付勢しており、上記クラッチ機構は、上記本体部において、上記取付け軸周りに環状に配列され、かつ下向きに突出する複数の第1係合凸部と、上記操作部において、上記取付け軸周りに環状に配列され、上向きに突出するとともに上記複数の第1係合凸部と係合可能な複数の第2係合凸部と、を備えている。
In a preferred embodiment, the elastic member constantly urges the operation portion upward, and the clutch mechanism is arranged annularly around the attachment shaft and protrudes downward in the main body portion. A plurality of first engaging projections, and a plurality of second engagements arranged annularly around the mounting shaft and projecting upward while being able to engage with the plurality of first engaging projections. And a convex portion.
好ましい実施の形態ではまた、上記複数の第1係合凸部と、上記複数の第2係合凸部とは、それらが並ぶ方向の側面が所定方向に傾斜している。
In a preferred embodiment, the plurality of first engaging convex portions and the plurality of second engaging convex portions are inclined in a predetermined direction on the side surfaces in the direction in which they are arranged.
好ましい実施の形態では、上記保持部材の下位において、当該保持部材に対してその回転軸心を中心として相対回転可能なガイド部材をさらに備える。
In a preferred embodiment, a guide member that can rotate relative to the holding member about the rotation axis is provided below the holding member.
本発明の第2の側面によって提供される草刈り機は、動力源と、この動力源の動力によって回転駆動される回転刃取付け軸と、を備え、上記回転刃取付け軸には、上記第1の側面に係る草刈り機用回転刃が取付けられていることを特徴とする。
The mower provided by the second aspect of the present invention includes a power source and a rotary blade mounting shaft that is rotationally driven by the power of the power source, and the rotary blade mounting shaft includes the first side surface. A rotary blade for a mower according to the above is attached.
本発明に係る草刈り機用回転刃によれば、保持部材における操作部自体がコード状切断部材の基端側を巻回保持しているので、クラッチ機構が保持部材の本体部に対する操作部の相対回転を阻止する限りにおいて、コード状切断部材が不用意に繰り出されることはない。したがって、操作部の本体部に対する相対回転が許容される状態となったときのみ、コード状切断部材の延出長さを調節することができ、コード状切断部材の延出長さ調節の操作性が向上する。
According to the rotary blade for mower according to the present invention, since the operation portion itself of the holding member winds and holds the proximal end side of the cord-like cutting member, the clutch mechanism rotates relative to the main body portion of the holding member. As long as this is prevented, the cord-shaped cutting member is not unintentionally drawn out. Therefore, the extension length of the cord-like cutting member can be adjusted only when the relative rotation of the operation portion with respect to the main body is allowed, and the operability of adjusting the extension length of the cord-like cutting member can be adjusted. Will improve.
本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説明する実施形態の説明から、より明らかとなろう。
Other features and advantages of the present invention will become more apparent from the description of embodiments described below with reference to the drawings.
以下、本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, preferred embodiments of the present invention will be specifically described with reference to the drawings.
図1~図6は、本発明に係る草刈り機用回転刃およびこれが用いられた草刈り機の一実施形態を示している。図1によく表れているように、草刈り機Bにおいては、操作管12の基端側には、駆動源としての小型エンジン11が連結されており、その回転出力が、操作管12に内挿された伝動軸13を介して操作管12の先端部に伝達される構成となっている。小型エンジン11としては、作業者の携帯性を考慮して、たとえば排気量が25cc程度のものが用いられる。操作管12の基端には小型エンジン11が直接的に取り付けられる場合もあるし、フレシキブルな伝動軸を介してたとえば背負い枠に搭載されるエンジンが連結される場合もある。図2および図3によく表れているように、操作管12の先端部のギヤケース16には、回転刃取付け軸14が支持され、この回転刃取付け軸14と伝動軸13とは、ベベルギヤ機構(図示略)によって連携されている。回転刃取付け軸14には、その外周にスプラインが形成されているとともに、軸端には、軸方向に延びるねじ穴14aが形成されている。回転刃取付け軸14には、金属製の回転刃押さえ17がスプライン嵌合させられている。
1 to 6 show an embodiment of a rotary blade for a mower according to the present invention and a mower using the same. As clearly shown in FIG. 1, in the mower B, a small engine 11 as a drive source is connected to the proximal end side of the operation tube 12, and the rotation output is inserted into the operation tube 12. The transmission shaft 13 is transmitted to the distal end portion of the operation tube 12. As the small engine 11, an engine having a displacement of about 25 cc is used in consideration of the portability of the operator. The small engine 11 may be directly attached to the base end of the operation tube 12, or an engine mounted on a backpack frame, for example, may be connected via a flexible transmission shaft. 2 and 3, a rotary blade mounting shaft 14 is supported on the gear case 16 at the tip of the operation tube 12, and the rotary blade mounting shaft 14 and the transmission shaft 13 are connected to a bevel gear mechanism ( (Not shown). A spline is formed on the outer periphery of the rotary blade mounting shaft 14, and a screw hole 14a extending in the axial direction is formed at the shaft end. A rotating blade holder 17 made of metal is splined to the rotating blade mounting shaft 14.
上記回転刃取付け軸14には、本発明によって特徴づけられる回転刃Aが取り付けられる。
Rotating blade A characterized by the present invention is mounted on the rotating blade mounting shaft 14.
この回転刃Aは、図2および図3によく表れているように、上記回転刃取付け軸14に取付けられて回転させられ、かつ、コード状切断部材の一例としてのナイロンコード切断刃4aを保持する保持部材100と、この保持部材100に対してその回転軸心(回転刃取付け軸14と同一軸心)を中心として相対回転可能なガイド部材200とを備えている。
As shown in FIGS. 2 and 3, the rotary blade A is attached to the rotary blade mounting shaft 14 and rotated, and holds a nylon cord cutting blade 4a as an example of a cord-like cutting member. And a guide member 200 that can rotate relative to the holding member 100 around its rotation axis (same axis as the rotary blade mounting shaft 14).
本実施形態では、保持部材100は、本体部100aと、操作部100bとを備える。本体部100aはまた、支持ピース110と、ナイロンコード収容ケース120とを備える。
In the present embodiment, the holding member 100 includes a main body 100a and an operation unit 100b. The main body 100a also includes a support piece 110 and a nylon cord storage case 120.
支持ピース110は、回転刃押さえ17の下部円形膨出部17aに嵌合しうる中心孔111aをもつボス部111と、このボス部111から半径方向外方に延びるフランジ部112とを有し、樹脂によって形成される。このフランジ部112の下面には、後記するクラッチ機構160を構成する第1係合凸部161が形成されるが、これについては後述する。
The support piece 110 includes a boss portion 111 having a center hole 111a that can be fitted into the lower circular bulging portion 17a of the rotary blade retainer 17, and a flange portion 112 that extends radially outward from the boss portion 111. Formed of resin. A first engagement convex portion 161 constituting a clutch mechanism 160 described later is formed on the lower surface of the flange portion 112, which will be described later.
ナイロンコード収容ケース120は、中心孔121aを有するボス部121と、このボス部121の外周につながる環状のハウジング部122とを備え、たとえば樹脂一体成形によって形成される。ボス部121は、支持ピース110のボス部111の外径と同一外径を有し、上面には、支持ピース110の中心孔111aに嵌合する円形膨出部121bが形成されている。このボス部121の下面には、筒部121cが一体延出させられている。ハウジング部122は、円筒状の内周壁122a、この内周壁122aの下端から水平に延びるドーナツ円板状の底壁122b、およびこの底壁122bの外周部から垂直上方に延びる円筒状の外周壁122cによって囲まれており、上方が開放する溝状とされている。
The nylon cord housing case 120 includes a boss portion 121 having a center hole 121a and an annular housing portion 122 connected to the outer periphery of the boss portion 121, and is formed by resin integral molding, for example. The boss portion 121 has the same outer diameter as the outer diameter of the boss portion 111 of the support piece 110, and a circular bulging portion 121 b that fits into the center hole 111 a of the support piece 110 is formed on the upper surface. A cylindrical portion 121 c is integrally extended on the lower surface of the boss portion 121. The housing portion 122 includes a cylindrical inner peripheral wall 122a, a donut disk-shaped bottom wall 122b extending horizontally from the lower end of the inner peripheral wall 122a, and a cylindrical outer peripheral wall 122c extending vertically upward from the outer peripheral portion of the bottom wall 122b. Is formed in a groove shape that is open at the top.
操作部100bは、ナイロンコード収容ケース120のハウジング部122の上方開放部分を塞ぐように位置するカバー部130と、ナイロンコード4を巻回保持するためのコード保持部140とを一体的に有し、支持ピース110のボス部111の外周ないしナイロンコード収容ケース120のボス部121の外周に回転可能かつ上下方向スライド移動可能に嵌合している。操作部100bは、樹脂成形により形成することができるが、本実施形態では、成形の都合上、カバー部130とコード保持部140とを別々に成形した後、一体化している。
The operation part 100b integrally has a cover part 130 positioned so as to close the upper open part of the housing part 122 of the nylon cord housing case 120, and a cord holding part 140 for winding and holding the nylon cord 4. The support piece 110 is fitted to the outer periphery of the boss portion 111 of the support piece 110 or the outer periphery of the boss portion 121 of the nylon cord housing case 120 so as to be rotatable and slidable in the vertical direction. Although the operation part 100b can be formed by resin molding, in this embodiment, for convenience of molding, the cover part 130 and the cord holding part 140 are separately molded and then integrated.
カバー部130は、全体としてドーナツ円盤状をした樹脂製であり、内周側上面に段落ち部131が形成され、この段落ち部131の上面に、上記した第1係合凸部161と協働してクラッチ機構160を構成する第2係合凸部162が形成されている。このカバー部130の外周部は、操作部100bが下動する余裕を残して、ハウジング部122の外周壁122cの上方から外側に回り込む薄肉状の防塵壁132としてある。また、この防塵壁132の外周上部にはローレット133が形成されており、このローレット133が操作部100bを回転操作する際の滑りを防止する。
The cover portion 130 is made of a resin having a donut disk shape as a whole, and a stepped portion 131 is formed on the upper surface on the inner peripheral side, and the upper surface of the stepped portion 131 cooperates with the first engaging convex portion 161 described above. A second engagement convex portion 162 that works to constitute the clutch mechanism 160 is formed. The outer peripheral part of the cover part 130 is a thin dust-proof wall 132 that goes around from the upper part of the outer peripheral wall 122c of the housing part 122 to the outside, leaving a margin for the operation part 100b to move downward. Further, a knurl 133 is formed on the outer periphery of the dust-proof wall 132, and the knurl 133 prevents slipping when the operation unit 100b is rotated.
コード保持部140は、カバー部130の内周寄りの下面に上端が接続される筒胴部141と、この筒胴部141の下端につながる外向フランジ部142とを有し、カバー部130の下面と協働して、横方向に開放する環状溝の形態をしたコード巻回部143を形成している。このコード保持部140は、その上部をカバー部130の内周に形成した筒部134に外嵌させて、カバー部130と一体化させられている。また、コード保持部140の筒胴部141の内周面とハウジング部122の内周壁122aの外周面との間に形成された環状空間に、上端がコード保持部140の適部に、下端がハウジング部122の底壁122bに弾接するようにして圧縮コイルバネ150が組みこまれており、これにより、操作部100bは、常時上方に向けて付勢されている。
The cord holding part 140 has a cylindrical body part 141 whose upper end is connected to the lower surface near the inner periphery of the cover part 130, and an outward flange part 142 connected to the lower end of the cylindrical body part 141. In cooperation with, a cord winding portion 143 in the form of an annular groove that opens in the lateral direction is formed. The cord holding portion 140 is integrated with the cover portion 130 by fitting an upper portion thereof to a cylindrical portion 134 formed on the inner periphery of the cover portion 130. In addition, in the annular space formed between the inner peripheral surface of the cylindrical body 141 of the cord holding part 140 and the outer peripheral surface of the inner peripheral wall 122a of the housing part 122, the upper end is an appropriate part of the cord holding part 140 and the lower end is A compression coil spring 150 is incorporated so as to elastically contact the bottom wall 122b of the housing portion 122, whereby the operation portion 100b is always urged upward.
クラッチ機構160は、上記したように、支持ピース110に設けた複数の第1係合凸部161と、カバー部130に設けた複数の第2係合凸部162とによって形成される。第1係合凸部161は、第2係合凸部162が嵌まり込みうる空間をあけて環状に配列されており、第2係合凸部162は、第1係合凸部161の形成領域と上下方向に重なる環状領域に配列されている。さらに、第1係合部161と第2係合凸部162の相互に当接する側面161a,162aは、図4に示すように傾斜させられている。この側面161a,162aの傾斜の方向は、第1係合凸部161aについていえば、先端に向かうほど(下方に向かうほど)図4にNで示す回転駆動方向にずれる方向とされる。また、第1係合凸部161の頂面161bと第2係合凸部162の頂面162bは、水平な平坦面とされており、図6に示すように両頂面161b,162bどうしが当接した状態において、相互に弾接状態で摺動して、支持ピース110に対して操作部100bが相対回動しうるようにしてある。
As described above, the clutch mechanism 160 is formed by the plurality of first engagement convex portions 161 provided on the support piece 110 and the plurality of second engagement convex portions 162 provided on the cover portion 130. The first engagement protrusions 161 are arranged in an annular shape with a space in which the second engagement protrusions 162 can be fitted, and the second engagement protrusions 162 are formed as the first engagement protrusions 161. They are arranged in an annular region that overlaps the region in the vertical direction. Further, the side surfaces 161a and 162a of the first engaging portion 161 and the second engaging convex portion 162 that are in contact with each other are inclined as shown in FIG. The direction of the inclination of the side surfaces 161a and 162a is the direction deviating from the rotational drive direction indicated by N in FIG. 4 toward the tip (downward) as far as the first engagement convex portion 161a is concerned. Further, the top surface 161b of the first engaging convex portion 161 and the top surface 162b of the second engaging convex portion 162 are horizontal flat surfaces, and as shown in FIG. 6, the two top surfaces 161b and 162b are connected to each other. In the abutting state, the operation unit 100b can slide relative to the support piece 110 by sliding in a resilient contact state with each other.
ハウジング部122の外周壁122cには、ナイロンコード導出孔123がハウジング部122の直径方向に対向する2箇所に形成されている。この実施形態では、外周壁122cに開けた孔124に、耐磨耗性に優れた硬質材料でできたカラー125を嵌め込んで形成している。ハウジング部122の底壁122bには、この底壁122bとコード保持部140の外向フランジ部142との間の隙間にナイロンコード4が入り込むのを阻止するための環状凸部126が形成されている。
In the outer peripheral wall 122c of the housing part 122, nylon cord lead-out holes 123 are formed at two locations facing the diameter direction of the housing part 122. In this embodiment, a collar 125 made of a hard material having excellent wear resistance is fitted into a hole 124 formed in the outer peripheral wall 122c. An annular convex portion 126 is formed on the bottom wall 122b of the housing portion 122 to prevent the nylon cord 4 from entering the gap between the bottom wall 122b and the outward flange portion 142 of the cord holding portion 140. .
図3に表れているように、カバー部130の適所には、周方向に隣接する一対の孔1135が形成されており、ナイロンコード4は、その中心付近がこれら孔135に通され、実質的に2本となったナイロンコード4が溝状のコード巻回部143に巻回されることにより、ナイロンコード収容ケース120のハウジング部122に収容されている。2本のナイロンコード4の先端側は、ナイロンコード収容ケース120にその直径方向に対向するように2箇所開けたナイロンコード導出孔123からそれぞれ外部に導出され、このように導出された部分の先端側が、ナイロンコード切断刃4aとして機能することになる。
As shown in FIG. 3, a pair of circumferentially adjacent holes 1135 are formed at appropriate positions of the cover portion 130, and the nylon cord 4 is substantially passed through these holes 135 in the vicinity of the center thereof. The two nylon cords 4 are wound around the groove-like cord winding portion 143 and are accommodated in the housing portion 122 of the nylon cord housing case 120. The leading end sides of the two nylon cords 4 are led out to the outside from nylon cord lead-out holes 123 formed in two locations so as to face the nylon cord housing case 120 in the diametrical direction. The side functions as the nylon cord cutting blade 4a.
ガイド部材200は、中心筒部211およびこの中心筒部211の下端から延出する円板部220を備え、円板部220は、保持部材100の外周と対応する付近までは水平に延び、それより外周側は、上方に変位させられている。この実施形態においては、中心筒部211および円板部220の内周部は金属によって形成され、円板部220のその余の部分は樹脂によって形成されている。金属部分と樹脂部分の一体化は、インサート成形法によって行うことができる。このガイド部材200における中心筒部211の内面には、軸方向に重ねた2個のベアリング230がその外輪231を圧入することにより保持されている。このガイド部材200は、上側のベアリング230の内輪232をナイロンコード収容ケース120の筒部121cの下面に当接させた状態で、これらベアリング230およびナイロンコード収容ケース120のボス部121の中心孔121aを通したボルト15を回転刃取付け軸14のねじ穴14aにねじ込むことにより、当該ボルト15に対し、その軸線(回転刃取付け軸14の軸線)を中心として相対回転可能に支持される。このボルト15の締め込みにより、支持ピース110とナイロンコード収容ケース120とが、回転刃取付け軸14と一体化させられる。
The guide member 200 includes a center tube portion 211 and a disk portion 220 extending from the lower end of the center tube portion 211. The disk portion 220 extends horizontally to the vicinity corresponding to the outer periphery of the holding member 100, and The outer peripheral side is displaced upward. In this embodiment, the inner peripheral part of the center cylinder part 211 and the disk part 220 is formed of metal, and the remaining part of the disk part 220 is formed of resin. The integration of the metal portion and the resin portion can be performed by an insert molding method. Two bearings 230 stacked in the axial direction are held on the inner surface of the central cylindrical portion 211 of the guide member 200 by press-fitting the outer ring 231. The guide member 200 is configured so that the inner ring 232 of the upper bearing 230 is in contact with the lower surface of the cylindrical portion 121c of the nylon cord housing case 120 and the center hole 121a of the boss portion 121 of the bearing 230 and the nylon cord housing case 120. The bolt 15 that has passed through is screwed into the screw hole 14 a of the rotary blade mounting shaft 14, so that the bolt 15 is supported so as to be relatively rotatable about its axis (axis of the rotary blade mounting shaft 14). By tightening the bolt 15, the support piece 110 and the nylon cord housing case 120 are integrated with the rotary blade mounting shaft 14.
図3および図4に示すように、クラッチ機構160の第1係合凸部161と第2係合凸部162とが係合した状態では、保持部材100の本体部100aと操作部100bとの相対回転は阻止される。操作部100bは、圧縮コイルバネ150により常時上向きに付勢されているので、このような第1係合凸部161と第2係合凸部162との相互係合状態は、安定的に維持される。しかも、第1係合凸部161と第2係合凸部162は、図4に示すように相互当接側面161a,162aが傾斜しているので、この傾斜が第1係合凸部161が駆動方向に回転するとき、第2係合凸部162との離脱を阻止する作用をし、このことによっても、第1係合凸部161と第2係合凸部162との相互係合状態は安定的に維持される。また、このとき、図3に示すように、コード保持部140の外向フランジ部142とハウジング部122の底壁122bとの間に隙間ができているが、この隙間に巻回状態から緩んだナイロンコード4が入り込むことは、環状凸部126により阻止され、操作部100bが下動できなくなるといった事態は起こらない。
As shown in FIG. 3 and FIG. 4, when the first engagement convex portion 161 and the second engagement convex portion 162 of the clutch mechanism 160 are engaged, the main body portion 100 a and the operation portion 100 b of the holding member 100 are engaged. Relative rotation is prevented. Since the operation part 100b is always urged upward by the compression coil spring 150, the mutual engagement state between the first engagement convex part 161 and the second engagement convex part 162 is stably maintained. The Moreover, the first engagement convex portion 161 and the second engagement convex portion 162 are inclined at the mutual contact side surfaces 161a and 162a as shown in FIG. When rotating in the driving direction, it acts to prevent detachment from the second engaging convex portion 162, and this also causes the first engaging convex portion 161 and the second engaging convex portion 162 to be in mutual engagement. Is stably maintained. Further, at this time, as shown in FIG. 3, a gap is formed between the outward flange portion 142 of the cord holding portion 140 and the bottom wall 122b of the housing portion 122, and the nylon loosened from the wound state in this gap. The entry of the cord 4 is prevented by the annular convex portion 126, and the operation unit 100b cannot be moved downward.
ナイロンコード切断刃4aは、磨耗によって次第に短くなる。この場合には、次のようにしてナイロンコード切断刃4aの延出長さを延長することができる。すなわち、操作部100bを圧縮コイルバネ150の付勢力に抗して押し下げて第1係合凸部161と第2係合凸部162との係合を解き、操作部100bをナイロンコード4の繰り出し方向に所望量回転させた後、圧縮コイルバネ150の弾力によって操作部100bを上動させて第1係合凸部161と第2係合凸部162とを係合させる。これにより、コード巻回部143から繰り出された分、ナイロンコード切断刃4aの延出長さが延長される。
The nylon cord cutting blade 4a is gradually shortened due to wear. In this case, the extension length of the nylon cord cutting blade 4a can be extended as follows. That is, the operating portion 100b is pushed down against the urging force of the compression coil spring 150 to release the engagement between the first engaging convex portion 161 and the second engaging convex portion 162, and the operating portion 100b is moved out of the nylon cord 4. Then, the operating portion 100b is moved upward by the elasticity of the compression coil spring 150 to engage the first engaging convex portion 161 and the second engaging convex portion 162. Thereby, the extension length of the nylon cord cutting blade 4a is extended by the amount fed from the cord winding portion 143.
なお、本実施形態では、上記したように、第1係合凸部161と第2係合凸部162の側面161a,162aが傾斜させられていることから、次のような操作でナイロンコード切断刃4aの延出長さを延長することができる。すなわち、操作部100bを下方に向けて押し込むと、第1係合凸部161と第2係合凸部162との相互当接側面161a,162aの斜面効果により、操作部100bは、本体部100a(支持ピース110)に対して相対回転しながら下動する。そして、第1係合凸部161と第2係合凸部162の係合が解けるまで下動させた後押圧力を緩めると、圧縮コイルバネ150の回転方向の復帰弾力により操作部100bがわずかに逆転し、図6に示すように、第2係合凸部162の頂面162bが第1係合凸部161の頂面161bに載った状態となる。この状態でコード状切断部材4aを外方に向けて引っ張ると、第1係合凸部161と第2係合凸部162の頂面161b,162bどうしが滑って操作部100bが回転し、やがて圧縮コイルバネ150の弾力により、第1係合凸部161と第2係合凸部162とが自動的に係合するのである。これにより、操作部100bが回転してナイロンコード4が繰り出される分、ナイロンコード切断刃4aの延出長さが延長される。
In the present embodiment, as described above, since the side surfaces 161a and 162a of the first engagement convex portion 161 and the second engagement convex portion 162 are inclined, the nylon cord is cut by the following operation. The extending length of the blade 4a can be extended. That is, when the operation portion 100b is pushed downward, the operation portion 100b is moved to the main body portion 100a by the slope effect of the mutual contact side surfaces 161a and 162a of the first engagement convex portion 161 and the second engagement convex portion 162. It moves downward while rotating relative to (support piece 110). Then, when the post-pressing force is lowered until the engagement between the first engagement convex portion 161 and the second engagement convex portion 162 is released, the operating portion 100b is slightly moved by the return elastic force in the rotational direction of the compression coil spring 150. As shown in FIG. 6, the top surface 162 b of the second engagement convex portion 162 is placed on the top surface 161 b of the first engagement convex portion 161. In this state, when the cord-like cutting member 4a is pulled outward, the top surfaces 161b and 162b of the first engagement convex portion 161 and the second engagement convex portion 162 slide to rotate, and the operation portion 100b is rotated. The first engagement convex portion 161 and the second engagement convex portion 162 are automatically engaged by the elasticity of the compression coil spring 150. Thus, the extension length of the nylon cord cutting blade 4a is extended by the amount that the nylon cord 4 is fed out by rotating the operation portion 100b.
草刈り機Bを用いて草刈り作業を行う際には、たとえば、スロットルレバーを操作するなどしてエンジン11のスロットルの開度を上げると、エンジン11の回転出力により、回転刃Aのうち、保持部材100ないしナイロンコード切断刃4aが回転させられる。エンジン11のスロットルの開度を調節することにより、ナイロンコード切断刃4aの回転数を調節することができる。エンジン11の回転出力は、伝動軸13からギヤケース16内のベベルギヤ(図示略)により減速され、回転刃取付け軸14を介して保持部材100ないしナイロンコード切断刃4aへと伝えられる。保持部材100ないしナイロンコード切断刃4aの回転数は、たとえば5,000~6,300rpmに達する。回転刃Aの外径(ガイド部材200の外径)をたとえば300mmとすると、ナイロンコード切断刃4aの先端部の周速は優に350km/hに達する。この回転刃Aを地面に沿って移動させてゆくと、雑草等の比較的軟質細状の物体は、ガイド部材200によってそれ以上の半径方向内方への進入を阻止され、高速で旋回するナイロンコード切断刃4aによる横方向からの強烈な衝突を受け、その衝撃によって難なく切断される。ナイロンコード切断刃4aは、直径が高々3mm程度であり、かつ軽量であるが、先端部の周速が上記のようにきわめて高速であるため、軟質である雑草等の茎を切断するのには十分な運動エネルギを有しているのである。
When mowing using the mower B, for example, if the throttle opening of the engine 11 is increased by operating a throttle lever or the like, the holding member 100 of the rotary blade A is rotated by the rotational output of the engine 11. Or the nylon cord cutting blade 4a is rotated. By adjusting the throttle opening of the engine 11, the rotational speed of the nylon cord cutting blade 4a can be adjusted. The rotational output of the engine 11 is decelerated from the transmission shaft 13 by a bevel gear (not shown) in the gear case 16, and is transmitted to the holding member 100 or the nylon cord cutting blade 4a via the rotary blade mounting shaft 14. The number of rotations of the holding member 100 or the nylon cord cutting blade 4a reaches, for example, 5,000 to 6,300 rpm. If the outer diameter of the rotary blade A (the outer diameter of the guide member 200) is, for example, 300 mm, the peripheral speed of the tip portion of the nylon cord cutting blade 4a will easily reach 350 km / h. When this rotary blade A is moved along the ground, relatively soft and thin objects such as weeds are prevented from entering further inward in the radial direction by the guide member 200, and nylon that turns at a high speed. It receives a strong collision from the lateral direction by the cord cutting blade 4a and is cut without difficulty by the impact. The nylon cord cutting blade 4a has a diameter of about 3 mm at most and is lightweight, but the peripheral speed of the tip is extremely high as described above, so that it is necessary to cut soft weeds and other stems. It has enough kinetic energy.
ナイロンコード切断刃4aは、使用を継続することによって、先端部において摩耗や切損等が起こり、ナイロンコード導出孔123からの延出長さが次第に短くなっていく。このような場合には、エンジン11を停止して、保持部材100における操作部100bを押し下げて第1係合凸部161と第2係合凸部162との係合を解き、操作部100bをナイロンコード4の繰り出し方向に回転させて再び第1係合凸部161と第2係合凸部162とを係合させるだけで、容易にナイロンコード切断刃4aの延出長さを延長できることは、上述したとおりである。また、操作部100bがコード巻回部143を一体的に有しているため、回転刃Aの高速回転中、不用意にナイロンコード切断刃4aが繰り出されてしまうことがないことも、上述したとおりである。
As the nylon cord cutting blade 4a continues to be used, wear or breakage occurs at the tip, and the extension length from the nylon cord lead-out hole 123 gradually decreases. In such a case, the engine 11 is stopped, the operation part 100b in the holding member 100 is pushed down to disengage the first engagement convex part 161 and the second engagement convex part 162, and the operation part 100b is The extension length of the nylon cord cutting blade 4a can be easily extended by simply rotating the nylon cord 4 in the feeding direction and engaging the first engagement convex portion 161 and the second engagement convex portion 162 again. , As described above. Moreover, since the operation part 100b has the cord winding part 143 integrally, during the high speed rotation of the rotary blade A, the nylon cord cutting blade 4a is not unintentionally fed out as described above. It is as follows.
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範囲内でのあらゆる変更は、すべて本発明の範囲に包摂される。
Of course, the scope of the present invention is not limited to the above-described embodiments, and all modifications within the scope of the claims are all included in the scope of the present invention.
回転刃Aにおいては、操作部100bを下動させることにより、クラッチ機構160を解除するようちしているが、操作部を上動させることによりクラッチ機構を解除するようにしてもよい。要するに、操作部とコード巻回部とが一体的に構成されていればよい。
In the rotary blade A, the clutch mechanism 160 is released by moving the operation unit 100b downward, but the clutch mechanism may be released by moving the operation unit upward. In short, the operation unit and the cord winding unit may be configured integrally.
回転刃Aにおいてはまた、保持部材100ないし回転刃取付け軸14に対して相対回転可能なガイド部材200を設けているが、このガイド部材200を設けるかどうかは、選択事項である。
In the rotary blade A, the guide member 200 that can rotate relative to the holding member 100 or the rotary blade mounting shaft 14 is also provided, and whether or not the guide member 200 is provided is a matter of choice.
さらに、本発明の回転刃Aが取付けられて使用される草刈り機は、図1に示したような操作管12の先端に回転刃取付け軸14を備える構成のものに限定されず、車輪を有して地面を移動可能なフレームに、エンジン等の動力源およびこの動力源によって回転駆動される回転刃取付け軸を有する、いわゆる自走式の草刈り機にも本発明の回転刃を取り付けて使用することができる。
Further, the mowing machine to which the rotary blade A of the present invention is attached is not limited to the one having the rotary blade mounting shaft 14 at the tip of the operation tube 12 as shown in FIG. The rotary blade of the present invention can also be attached to a so-called self-propelled mower having a power source such as an engine and a rotary blade mounting shaft that is rotationally driven by the power source on a frame that can move on the ground. it can.
Claims (5)
- 草刈り機の回転刃取付け軸に取付けられて回転させられる保持部材と、
上記保持部材の内部に基端側が保持され、先端側が当該保持部材に設けた導出孔から半径方向外方に導出させられるコード状切断部材と、を備えた草刈り機用回転刃であって、
上記保持部材は、上記取付け軸に連結されてこの取り付け軸と一体回転する本体部と、
上記本体部に対して上記取付け軸の軸方向に所定のストロークで移動可能かつ上記取付け軸周りに相対回転操作可能に組み合わされ、かつ、上記コード状切断部材の基端側を巻回保持する操作部と、
上記操作部を上記軸方向の一方方向に付勢する弾性部材と、
上記操作部が上記弾性部材の弾力によって上記ストロークにおける所定位置にあるときこの操作部と上記本体部との相対回転を阻止するとともに、上記操作部が上記弾性部材の弾力に抗して上記所定位置から移動させられたときこの操作部と上記本体部との相対回転を許容するクラッチ機構と、を備えることを特徴とする、草刈り機用回転刃。 A holding member attached to the rotary blade mounting shaft of the mower and rotated;
A rotary blade for a mowing machine, comprising: a cord-shaped cutting member that has a proximal end held inside the holding member and a distal end side led out radially outward from a lead-out hole provided in the holding member;
The holding member is connected to the mounting shaft and rotates integrally with the mounting shaft;
Operation that is combined with the main body so as to be movable in the axial direction of the mounting shaft with a predetermined stroke and capable of relative rotation around the mounting shaft, and for winding and holding the proximal end side of the cord-shaped cutting member And
An elastic member for urging the operating portion in one axial direction;
When the operation portion is at a predetermined position in the stroke by the elasticity of the elastic member, the operation portion and the main body portion are prevented from rotating relative to each other, and the operation portion resists the elasticity of the elastic member. A rotary blade for a mowing machine, comprising: a clutch mechanism that allows relative rotation between the operation portion and the main body portion when the operation portion is moved. - 上記弾性部材は、上記操作部を上方に向けて常時付勢しており、
上記クラッチ機構は、
上記本体部において、上記取付け軸周りに環状に配列され、かつ下向きに突出する複数の第1係合凸部と、
上記操作部において、上記取付け軸周りに環状に配列され、上向きに突出するとともに上記複数の第1係合凸部と係合可能な複数の第2係合凸部と、
を備えている、請求項1に記載の草刈り機用回転刃。 The elastic member constantly urges the operation unit upward,
The clutch mechanism is
A plurality of first engaging convex portions arranged in an annular shape around the mounting shaft and projecting downward in the main body portion;
A plurality of second engaging protrusions arranged in an annular shape around the attachment shaft and protruding upward and engageable with the plurality of first engaging protrusions;
The rotary blade for mowing machines according to claim 1, comprising: - 上記複数の第1係合凸部と、上記複数の第2係合凸部とは、それらが並ぶ方向の側面が所定方向に傾斜している、請求項2に記載の草刈り機用回転刃。 The rotary blade for mowing machine according to claim 2, wherein the plurality of first engaging convex portions and the plurality of second engaging convex portions are inclined in a predetermined direction on the side surfaces in the direction in which they are arranged.
- 上記保持部材の下位において、当該保持部材に対してその回転軸心を中心として相対回転可能なガイド部材をさらに備える、請求項1ないし3のいずれかに記載の草刈り機用回転刃。 The rotary blade for a mowing machine according to any one of claims 1 to 3, further comprising a guide member that is rotatable relative to the holding member about the rotation axis at a lower position of the holding member.
- 動力源と、この動力源の動力によって回転駆動される回転刃取付け軸と、を備え、
上記回転刃取付け軸には、請求項1ないし4のいずれかに記載の草刈り機用回転刃が取付けられていることを特徴とする、草刈り機。 A power source and a rotary blade mounting shaft that is rotationally driven by the power of the power source;
The mowing machine according to any one of claims 1 to 4, wherein the rotary blade mounting shaft is attached to the rotary blade mounting shaft.
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
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CN104221578A (en) * | 2013-06-09 | 2014-12-24 | 南京德朔实业有限公司 | Grass trimmer and grass trimming head thereof |
JP2015228800A (en) * | 2014-06-03 | 2015-12-21 | 有限会社小林産業 | Rotary blade for grass mower, protection member for grass mower, and portable power grass mower |
JP2018007593A (en) * | 2016-07-12 | 2018-01-18 | 有限会社小林産業 | Portable type power mower, and method for application thereof |
CN108055909A (en) * | 2018-02-06 | 2018-05-22 | 怡天技动力机械研发(临沂)有限公司 | A kind of walking type mower |
WO2020255852A1 (en) * | 2019-06-17 | 2020-12-24 | 寛範 小林 | Rotating blade for work machine and work machine using same |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN107926917B (en) * | 2018-01-15 | 2023-11-21 | 怡天技动力机械研发(临沂)有限公司 | Rotary cutter for mower and portable mower using same |
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WO2007023758A1 (en) * | 2005-08-22 | 2007-03-01 | Sakuji Yamada | Rotary blade for bush cutter and bush cutter using the same |
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- 2012-10-12 WO PCT/JP2012/076432 patent/WO2013054880A1/en active Application Filing
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JPS617932U (en) * | 1984-06-20 | 1986-01-18 | 株式会社 マキタ電機製作所 | grass mower |
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JPH01141518A (en) * | 1987-11-04 | 1989-06-02 | White Consolidated Ind Inc | Method and apparatus for cutting plant |
WO2007023758A1 (en) * | 2005-08-22 | 2007-03-01 | Sakuji Yamada | Rotary blade for bush cutter and bush cutter using the same |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
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CN104221578A (en) * | 2013-06-09 | 2014-12-24 | 南京德朔实业有限公司 | Grass trimmer and grass trimming head thereof |
JP2015228800A (en) * | 2014-06-03 | 2015-12-21 | 有限会社小林産業 | Rotary blade for grass mower, protection member for grass mower, and portable power grass mower |
JP2018007593A (en) * | 2016-07-12 | 2018-01-18 | 有限会社小林産業 | Portable type power mower, and method for application thereof |
CN108055909A (en) * | 2018-02-06 | 2018-05-22 | 怡天技动力机械研发(临沂)有限公司 | A kind of walking type mower |
WO2019153657A1 (en) * | 2018-02-06 | 2019-08-15 | 怡天技动力机械研发(临沂)有限公司 | Walking mower |
WO2020255852A1 (en) * | 2019-06-17 | 2020-12-24 | 寛範 小林 | Rotating blade for work machine and work machine using same |
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