JP3128859U - Mowing blade - Google Patents

Abstract

[PROBLEMS] To cut sharply and sharply without scattering solid matter even when thick grass or the like grows on a grassy spot mixed with solid matter such as pebbles or small metal pieces. The purpose is to provide a mowing blade.
A metal disc blade 4 and an attachment 1 fixed to the disc blade 4 are provided. A plastic bushing wire 5 having a predetermined length is held on the attachment 1 in a protruding shape from the outer periphery of the disc blade 4 in the outer radial direction R. The brush wire 5 has a polygonal cross section. In addition, a plurality of concavo-convex portions 12 are formed at a predetermined pitch on the ridge line portion of the brush wire 5.
[Selection] Figure 1

Description

  The present invention relates to a mowing blade.

  Conventional grass cutting blades have a metal disk shape with a large number of teeth on the outer circumference, or a thin plastic wire with a circular cross section extending from the rotating disk in the outer diameter direction to form a cutting blade. Are known.

Of the above-mentioned conventional grass cutting blades, those with a metal disc shape are suitable for cutting trees and thick grass, but if solid objects such as pebbles and small metal pieces are mixed in the grass, the surroundings are fast. It is very dangerous for workers and the like. Therefore, using a grass cutting blade having a plastic wire reduces the risk of scattering, but a plastic wire with a circular cross section has a low cutting ability, and it is difficult to cut trees, thick grass, and the like. For this reason, there are few effective methods for cutting off thick grass and the like that grows in the grass that is filled with a lot of solid materials.
Therefore, the present invention cuts sharply and sharply without scattering solid matter even when thick grass grows on the grass with solid matter such as pebbles and small metal pieces mixed in. An object of the present invention is to provide a mowing blade that can be used.

  In order to achieve the above object, a grass cutting blade according to the present invention comprises a metal disk blade and a mounting tool fixed to the disk blade, and the mounting tool has a plastic cutting tool of a predetermined length. It is configured to hold the wire rod in a protruding shape from the outer periphery of the disk blade in the outer diameter direction, the brush wire has a cross-sectional polygonal shape, and the ridge line portion of the brush wire A plurality of concave and convex portions are formed at a predetermined pitch.

  The grass cutting blade according to the present invention includes a metal disk blade and a mounting tool fixed to the disk blade, and a plastic cutting blade having a predetermined length is formed in a holding hole formed in the mounting tool. The wire rod is configured to be detachably inserted in a protruding state from the outer periphery of the disk blade in an outer radial direction, the brush cutting wire has a wire portion having a cross-sectional polygonal shape, and A plurality of concavo-convex portions are formed at a predetermined pitch on the ridge line portion of the wire portion, and the brush wire is locked to the attachment tool in a state of being inserted into the holding hole to counteract rotational centrifugal force. A bulging portion that prevents separation in the outer diameter direction is integrally formed with the proximal end of the wire portion.

  Further, a grass cutting blade according to the present invention includes a metal disc blade and an attaching tool fixed to the disc blade, and a plastic mower having a predetermined length is formed in a holding hole formed in the attaching device. The wire rod is configured to be held in a removably inserted state as a protruding shape from the outer periphery of the disk blade to the outer diameter direction. The brush wire includes a wire portion having a polygonal cross section, and a wire portion of the wire portion. A bulge portion that is formed at the base end and is locked to the attachment tool in a state of being inserted into the holding hole and prevents the centrifugal force from being removed in the outer diameter direction, and the wire portion In the ridge portion, a plurality of concavo-convex portions are formed at a predetermined pitch over a length range of 55% to 75% of the entire length from the tip to the intermediate portion, and the concavo-convex portions are omitted in the remaining portion.

The present invention has the following remarkable effects.
The grass cutting blade according to the present invention is configured to hold a plastic cutting wire of a predetermined length as a protruding shape from the outer periphery of the disk blade to the outer diameter direction on the attachment tool fixed to the metal disk blade. The brush wire has a cross-sectional polygonal shape, and a plurality of concavo-convex portions are formed at a predetermined pitch on the ridge line portion of the brush wire. Compared to the wire rod, the sharpness is much sharper, and it is possible to effectively cut trees and thick vegetation. Thus, even the grass that is difficult to cut with the conventional brush cutting wire can be cut efficiently. Further, even grass that contains solid objects such as pebbles and small metal pieces can be mowed without being scattered and can be safely operated with less danger to the operator and surroundings.

Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments.
As shown in FIGS. 1 and 2, one embodiment of the grass cutting blade according to the present invention is a metal disk blade 4 having a large number of through holes 7 and two plastic cutting blades of a predetermined length. The wire rods 5 and 5 are provided. The disc blade 4 integrally has a large number of tooth portions 14 on the outer periphery of the disc-shaped base portion 13. Further, the base portion 13 is provided with a large number of through holes 7 in a uniform arrangement (interval) as a whole so that the hole diameter gradually increases from the inner diameter side to the outer diameter side of the base portion 13. That is, a plurality of through holes 7 having the same hole diameter arranged at predetermined intervals in the circumferential direction are formed in a plurality of rows in the inner and outer directions, and the diameter of the through holes 7 gradually decreases in the inner diameter direction. It is formed as follows. Each tooth portion 14 is brazed with a super steel tip blade.
Then, the cutting wire 5 is detachable as a protruding shape from the outer periphery of the disc blade 4 in the outer radial direction R via the attachment 1 that is partially inserted into and fixed to the through hole 7 of the disc blade 4. To be attached.

The cutting wire 5 will be described. As shown in FIGS. 1 to 5, the cutting wire 5 is formed in the wire portion 10 having a polygonal cross section and the base end 10 a of the wire portion 10 in the holding hole 33. A bulging portion 15 that is locked to the attachment tool 1 in the inserted state and prevents separation in the outer diameter direction R against the rotational centrifugal force is integrally formed. That is, the bulging portion 15 has a columnar shape in which the base end 10a of the wire portion 10 is expanded in diameter with a small stepped portion. The wire portion 10 has a rectangular cross section (square shape). In addition, a plurality of concavo-convex parts 12 are formed on the ridge line parts 17 and 17 on the two sides at the symmetrical position among the four ridge line parts 17 of the wire part 10 from the tip 18 to the intermediate part 19 (this will be described later. range say unevenness forming portion 16) is formed at 55% to 75% of the length range predetermined pitch over L ₁₂ of the total length L ₁₀ of the wire portion 10, the remainder 11 (ranging from the intermediate portion 19 toward the proximal end 10a) The concave-convex portion 12 is omitted. The concavo-convex portions 12 are formed so as to have a predetermined pitch at symmetrical positions in the ridge line portions 17 and 17 on the two sides. The concave portion of the concavo-convex portion 12 is formed in a curved shape when viewed from the longitudinal section.

In other words, the wire portion 10 includes a concavo-convex forming portion 16 in which a plurality of concavo-convex portions 12 are formed on the ridge line portions 17 and 17 at the symmetrical positions of two sides in the range from the tip 18 to the intermediate portion 19, and the intermediate portion. And a remaining portion 11 in which the uneven portion 12 is omitted in a range from 19 to the base end 10a. The remaining portion 11 is formed over a length range L ₁₁ of 25% to 45% of the total length L ₁₀ of the wire portion 10, and is slightly increased from the outer periphery of the disc blade 4 when the cutting wire 5 is set on the attachment tool 1. It will be in the state to protrude (refer to Drawing 1). Since the remaining part 11 does not decrease in strength and has high durability, the brushing wire 5 can be prevented from being damaged during the work, and a safe work can be performed.

  Next, the mounting tool 1 will be described with reference to FIGS. The mounting tool 1 has a back part 2 that is in contact with the back surface 4a of the disc blade 4 and that is in contact with the face 4b. And the positioning protrusions 8 and 8 inserted into the two through-holes 7 and 7 adjacent to the disc blade 4 are projected on either one of the parts 3 as the back part 2 and on the other side. The recessed portions 9 and 9 into which the protruding portions 8 and 8 are inserted are recessed. Furthermore, the attachment tool 1 has a set screw 6 for screwing the component 3 to the back component 2 with the protruding portion 8 and the recessed portion 9 penetrating.

  Then, the back part 2 has a contact plate portion 20 that contacts the back surface 4 a of the disk blade 4, and protrudes upward from the contact plate portion 20 into two adjacent through holes 7 and 7 of the disk blade 4 from below. Two positioning protrusions (cylindrical portions) 8 and 8 to be fitted are integrally provided. The two positioning protrusions 8 and 8 are set to have outer diameter dimensions that can be inserted without gaps at positions corresponding to the two through holes 7 and 7 adjacent to the disk blade 4. The protrusions 8 and 8 are fitted into two through-holes 7 and 7 that have the same hole diameter and are close to each other in the circumferential direction among the many through-holes 7 of the disk blade 4. In this embodiment, the protrusions 8 are fitted in the two through holes 7 of the through holes 7 in the second row (second largest hole diameter) from the outer diameter side of the disc blade 4. Although it is formed so as to match, it is free to determine which size of the through holes 7 and 7 can be fitted. Further, the hole (inner peripheral surface) 21 of each protruding portion 8 is indirectly connected to the back surface of the backing plate portion 20. Further, the inner diameter of the hole 21 is set to be smaller than the outer diameter of a screw portion 6b of the set screw 6 described later, and the set screw 6 is screwed in while biting into the hole 21. The back component 2 is formed by integrally forming a backing plate portion 20 and both protruding portions 8 and 8 from plastic.

Next, the part 3 is formed in a plate shape having a substantially elliptical shape in plan view from plastic, and is recessed corresponding to the protrusions 8 and 8 of the back part 2. The protrusions 8 and 8 are inserted from below. And recesses 9 and 9 and screw insertion holes 31 and 31 that are reduced in diameter from the back (upper surface) of the recesses 9 and 9 with a stepped portion and penetrated upward. In addition, on the upper surface of the component 3, two storage recesses 32, 32 for storing a head 6a of a set screw 6 described later are provided, and the bottom surface of each storage recess 32 and the recess 9 are defined as follows. The screw insertion hole 31 is continuous. The inner diameter dimension of each recessed part 9 is formed slightly larger than the outer diameter dimension of the protruding part 8 of the back part 2, and an adhesive described later is provided between the recessed part 9 and the inserted protruding part 8. A void for filling is formed. Further, the screw insertion hole 31 has an inner diameter dimension into which the screw portion 6b of the set screw 6 can be inserted.
In addition, the part 3 has a cylindrical holding hole 33 through which the brush wire 5 is inserted and removed in the outer diameter direction R. The holding hole 33 is disposed in the middle of the two recessed portions 9 and 9 and penetrates in a direction orthogonal to the direction (circumferential direction of the disc blade 4) formed by the two recessed portions 9 and 9. Yes. The inner diameter dimension of the holding hole 33 is set so that the ridge line portions 17 on the four sides of the wire portion 10 are in contact with each other with almost no gap. Further, the outer diameter direction R end portion of the holding hole 33 is formed in a tapered round shape that expands to both sides in the circumferential direction (as shown in FIG. 2). Thereby, it is possible to effectively prevent the cutting wire 5 (the remaining portion 11) from being broken (due to stress concentration).

  Next, the set screw 6 is a tapping screw made of hard plastic, and the screw part 6 b is screwed into the hole 21 of the back part 2 through the screw insertion hole 31 of the part 3, and It is substantially the same surface as the back surface or slightly protrudes.

Next, the cutting wire 5 shown in FIG. 6 and FIG. 7 is that the uneven portions 12... Formed on the ridges 17 and 17 on the two sides are provided in a staggered manner, as shown in FIGS. It is different from the one.
Next, the brush wire 5 shown in FIGS. 8 and 9 is different from that of FIGS. That is, the brush wire 5 of FIG. 8 has a wire portion 10 having a triangular cross section, and a plurality of concavo-convex portions 12 are formed at predetermined pitches on ridge line portions 17 on three sides. 9 has a wire section 10 having a hexagonal cross section. For example, a plurality of concavo-convex sections 12 are formed on every other ridge line section 17 of the ridge line sections 17 of the six sides. It is formed at a predetermined pitch. In addition, even when the cross-sectional shape of the wire portion 10 is triangular or hexagonal, the uneven portions 12 may be provided in a staggered manner with different ridge line portions 17 (not shown).

Next, the usage method of the grass cutting blade of this invention is demonstrated.
First, as shown in FIGS. 1 and 10, the two attachment tools 1 and 1 are attached to the disc blade 4 at positions substantially opposite to the rotation axis P.
Specifically, the protrusions 8 and 8 of the back part 2 of each attachment 1 are fitted into the two adjacent through holes 7 and 7 of the disc blade 4 from below. Then, an adhesive is applied to the outer periphery of the protrusions 8 and 8 of the back part 2 protruding from the surface 4b of the disk blade 4 so that the two recessed parts 9 and 9 of the part 3 appear as protrusions 8 and 8. 8 and the disc blade 4 is sandwiched between the part 3 and the back part 2. Then, the set screw 6 is screwed while being inserted into the hole 21 of the back part 2 while passing through the screw insertion hole 31 of the part 3. When the screw 6 is screwed in until the head 6a of the set screw 6 appears and comes into contact with the housing recess 32 of the component 3, the attachment of the attachment 1 to the disc blade 4 is completed. In this way, the part 3, which is represented as the back part 2, has the protruding portion 8 and the recessed portion 9 fitted through the adhesive and screwed with the set screw 6. It is very firmly attached to the disc blade 4 and does not come off during the brushing operation. If the mounting tool 1 is detached, each component is made of plastic, so that the specific gravity is small, the hardness is low, and the danger is low.

And this disc blade 4 is attached to the rotation part of the front-end | tip of the bush for operation of a brush cutter (not shown), and the wire rod portion 10 of the brush cutter wire 5 is attached to each attachment 1 as shown in FIG. It is inserted into the holding hole 33 of the component 3 from the inner diameter side. Then, when the bulging portion 15 appears and is locked to the component 3, the setting is completed.
Then, as the disc blade 4 rotates, the brushing wires 5 and 5 are subjected to centrifugal force, and the bulging portion 15 is maintained in a state of being locked to the mounting tool 1. The brush cutting wire 5 does not leave the mounting tool 1. The wire portion 10 of the brush wire 5 is not fixed in the holding hole 33 of the attachment 1 and can rotate about the longitudinal axis. And this brush cutting wire 5 has a cross-sectional polygonal shape (square), and since the ridge line part 17 is formed with a plurality of concave and convex parts 12... The sharpness is much sharper, and it is possible to cut trees, thick grass, and the like that have been difficult to cut with conventional grass cutting blades.
Further, according to the brush cutting wires 5 and 5, the scattering of solid objects is suppressed as much as possible, and the brush cutting work is possible even in a narrow place near a fence, a building, or a stone wall.
Further, the remaining portion 11 on the proximal end side of the wire portion 10 is omitted from the uneven portion 12 and does not decrease in strength, so that it has high durability and is not easily damaged and is safe.

Further, by removing the cutting wire 5 and 5, it becomes possible to perform the cutting operation by the tooth portions 14 of the metal disk blade 4 and the cutting by the tooth portions 14 of the metal disk blade 4 Therefore, it is possible to easily switch to the brush cutting with the brush cutting wire 5 and use them properly according to the situation of the place of use. In addition, since the brush cutting wires 5 and 5 can be attached and detached while the disc blade 4 is attached to the operating rod, it can be easily and quickly switched, and no labor is required.
Moreover, since each member which comprises the attachment tool 1 is all formed from a plastics, even if the attachment tool 1 should be damaged during rotation of the disk blade 4 and a fragment | piece will fly, specific gravity is also more than a metal piece. Because it is small and has low hardness, there is little danger. In addition, in FIG. 1 of this invention, it is also preferable to perform attachment which makes this FIG. 1 a bottom view. That is, the attachment tool 1 is disposed on the back surface (lower surface) side of the disc blade 4 and the brushing wires 5 and 5 are provided on the back surface (lower surface) side.

  As described above, the grass cutting blade according to the present invention includes the metal disc blade 4 and the attachment 1 fixed to the disc blade 4, and the attachment 1 is provided with a plastic cutting wire having a predetermined length. 5 is configured so as to protrude from the outer periphery of the disc blade 4 in the outer diameter direction R, and the brush wire 5 has a polygonal cross section and is formed on the ridge line portion 17 of the brush wire 5. Since a plurality of irregularities 12 are formed at a predetermined pitch, the sharpness is much sharper than conventional (circular cross-section) cutting wire, and trees and thick plants can be cut effectively. Become. Thus, even the grass that is difficult to cut with a conventional cutting wire can be efficiently cut. In addition, by attaching the brush cutting wires 5 and 5 to the disc blade 4, even if the grass is mixed with solid objects such as pebbles and small metal pieces, the cutting can be performed without scattering, such as workers. It is possible to carry out safe work with less danger.

The mowing blade according to the present invention includes a metal disk blade 4 and a mounting tool 1 fixed to the disk blade 4, and a holding hole 33 formed in the mounting tool 1 has a predetermined length of plastic. It is configured to hold the remanufactured wire 5 in an inserted state in a detachable manner as a protruding shape from the outer periphery of the disc blade 4 in the outer diameter direction R,
The brush wire 5 has a wire portion 10 having a polygonal cross section, and a plurality of concave and convex portions 12 are formed on the ridge line portion 17 of the wire portion 10 at a predetermined pitch. Is formed integrally with the base end 10a of the wire portion 10 so that the bulging portion 15 is locked to the attachment 1 in the state of being inserted into the holding hole 33 and is prevented from detaching in the outer radial direction R against the rotational centrifugal force. Therefore, the sharpness is much sharper than that of the conventional (round cross section) cutting wire, and it is possible to effectively cut trees and thick vegetation. Thus, even the grass that is difficult to cut with the conventional brush cutting wire can be cut efficiently. In addition, by attaching the brush cutting wires 5 and 5 to the disk blade 4, even if the grass is mixed with solid objects such as pebbles and small metal pieces, the cutting can be performed without scattering, such as workers. It is possible to carry out safe work with less danger.
And since the bulging part 15 is integrally molded with the wire part 10, durability is large and there is little danger that the bulging part 15 and the wire part 10 will be separated and damaged by centrifugal force. Therefore, there is no accident of pulling out the brush wire 5 from the attachment 1 during the work, and a safe work can be performed. In addition, the bush wire 5 has high productivity and can be easily mass-produced.

The mowing blade according to the present invention includes a metal disk blade 4 and a mounting tool 1 fixed to the disk blade 4, and a holding hole 33 formed in the mounting tool 1 has a predetermined length of plastic. The trimming wire 5 is configured to be held in a removably inserted state as a protruding shape from the outer periphery of the disc blade 4 in the outer diameter direction R, and the trimming wire 5 has a wire portion 10 having a polygonal cross section. And a bulging portion 15 that is formed at the base end 10a of the wire portion 10 and is engaged with the attachment tool 1 in a state of being inserted into the holding hole 33 to prevent the rotation centrifugal force from detaching in the outer diameter direction R. a, and the ridge line portion 17 of the wire portion 10, a plurality of uneven portions 12 are formed at a predetermined pitch over 55% to 75% of the length range L ₁₂ of total length L ₁₀ from the tip 18 to the intermediate portion 19 The remaining part 11 has an uneven part 12 omitted, so it has a sharper sharpness compared to conventional (round cross-section) cutting wire, and wood and thick vegetation are also effective. It becomes possible to take Ri. Thus, even the grass that is difficult to cut with the conventional brush cutting wire can be cut efficiently. In addition, by attaching the brush cutting wires 5 and 5 to the disk blade 4, even if the grass is mixed with solid objects such as pebbles and small metal pieces, the cutting can be performed without scattering, such as workers. It is possible to carry out safe work with less danger.
In addition, the trimming wire 5 has a large durability because it does not reduce the strength of the base portion other than the portion to be actually trimmed (unevenness forming portion 16) by omitting the uneven portion 12 in the remaining portion 11. Can be prevented, and safe work can be performed.

It is a top view which shows one Embodiment of the mowing blade which concerns on this invention. It is a principal part enlarged plan view. It is a top view which shows a brush cutting wire. It is a principal part enlarged plan view. It is sectional drawing of FIG. 4, Comprising: (A) is BB sectional drawing, (B) is CC sectional drawing. It is a principal part enlarged plan view which shows the trimming wire of another shape. It is sectional drawing of FIG. 6, Comprising: (a) is DD sectional drawing, (b) is EE sectional drawing. It is an expanded cross-sectional view which shows the brush cutting wire of another shape. It is an expansion cross-sectional view which shows the brushing wire of another shape. It is an AA expanded sectional view of FIG.

Explanation of symbols

1 Mounting tool 4 Disc blade 5 Brush cutting wire
10 Wire part
10a proximal
11 balance
12 Concavity and convexity
15 bulge
17 Ridge line
18 Tip
19 Intermediate part
33 Holding hole L ₁₀ Overall length L ₁₂ Length range R Outer diameter direction

Claims (3)

A metal disc blade (4) and an attachment (1) fixed to the disc blade (4) are provided, and a plastic trimmer wire (5) having a predetermined length is attached to the attachment (1). Is held as a protruding shape from the outer periphery of the disk blade (4) in the outer radial direction (R),
The brush wire (5) has a polygonal cross section, and a plurality of concavo-convex portions (12) are formed at a predetermined pitch on the ridge line portion (17) of the brush wire (5). Mowing blade characterized by. A metal disc blade (4) and a mounting tool (1) fixed to the disc blade (4) are provided, and the holding hole (33) formed in the mounting tool (1) has a predetermined length. The plastic brush wire (5) is configured to be held in a removably inserted state as a protruding shape from the outer periphery of the disc blade (4) to the outer diameter direction (R),
The brush wire (5) has a wire portion (10) having a polygonal cross section, and the ridge line portion (17) of the wire portion (10) has a plurality of uneven portions (12), Formed at a predetermined pitch,
Furthermore, the brush wire (5) is locked to the attachment (1) while being inserted into the holding hole (33) to prevent it from being detached in the outer diameter direction (R) against the rotational centrifugal force. A grass cutting blade characterized in that the bulging portion (15) is integrally formed with the base end (10a) of the wire portion (10). A metal disc blade (4) and a mounting tool (1) fixed to the disc blade (4) are provided, and the holding hole (33) formed in the mounting tool (1) has a predetermined length. The plastic brush wire (5) is configured to be held in a removably inserted state as a protruding shape from the outer periphery of the disc blade (4) to the outer diameter direction (R),
The cutting wire (5) is formed by inserting the wire portion (10) having a polygonal cross section and the base end (10a) of the wire portion (10) into the holding hole (33) in the inserted state. A bulging portion (15) which is locked to the tool (1) and prevents the centrifugal force from separating in the outer diameter direction (R),
In addition, the ridge line portion (17) of the wire portion (10) has a plurality of uneven portions (12) that are 55% to 75% of the total length (L ₁₀ ) from the tip (18) to the intermediate portion (19). A mowing blade characterized in that it is formed at a predetermined pitch over a range (L ₁₂ ), and the uneven portion (12) is omitted from the remaining portion (11).

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