Brush cutter blade unit

Abstract

This product provides a metal brush cutter blade unit that can be used in brush cutting environments with many obstacles, achieves brush cutting efficiency superior to nylon cord, and offers excellent handling, economy, and safety. [Solution] A brush cutter blade unit is provided, comprising a blade body 30 consisting of a mounting portion 31 with an elongated mounting hole 32 and a second cutting blade 34 with an arc-shaped edge 35 and a greatly bent extension portion 33; a base plate 10 having a first cutting blade 20 around its periphery and to which the blade body is mounted; and a mounting member. By making the mounting hole of the blade body an elongated hole, making the edge of the second cutting blade arc-shaped, greatly bending the extension portion, and also providing a first cutting blade on the base plate, grass can be captured well and cut efficiently with the first cutting blade, and the impact caused by collision between the blade body and obstacles 81 can be mitigated.

Description

Technical Field

[0001] The present invention relates to a mowing blade unit used for mowing applications and a blade body thereof.

Background Art

[0002] Conventionally, there has been a grass mowing blade unit in which a plurality of blade bodies are axially attached to the axial attachment holes at the peripheral edge of a base parallel to and rotatably about a rotation axis. For example, Patent Document 1.

[0003] However, conventional grass mowing blade units have only mowed grass with blade bodies axially attached to a base at round holes. Even if the shape of the blade body is flat or bent in the middle, the degree of bending is small, so it is close to a flat plate, and moreover, the cutting edge of the cutting blade is linear.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Non-Patent Documents

[0005]

Summary of the Invention

Problems to be Solved by the Invention

[0006] Although capturing and mowing grass is an important condition for efficient grass mowing, in conventional grass mowing blade units, the blade body has not been able to capture grass.

[0007] Conventional grass mowing blade units have not been able to efficiently mow grass by capturing the grass and then mowing it with another cutting blade.

[0008] Conventional grass mowing blade units have only mowed grass with blade bodies axially attached to a base, so they have not been able to fully obtain the efficiency of grass mowing and the burden on the blade body has been large.

[0009] In conventional grass-cutting blade units, grass is cut only by the blade itself, so grass that cannot be cut by the blade tends to wrap around the rotation axis of the machine, hindering rotation and reducing work efficiency.

[0010] In conventional grass-cutting blade units, when the blade collided with an obstacle, its movement was greatly hindered, and the movement of the grass-cutting blade unit was also hindered, resulting in a large impact due to the kinetic energy generated.

[0011] In previous grass-cutting blade units, the movement of the blade was hindered when it collided with an obstacle, resulting in significant kickback. This new design aims to improve safety, including preventing the scattering of grass-cutting blades to the operator.

[0012] Conventional grass-cutting blade units often have the blade attached to the periphery of a disc-shaped base, and weight reduction of the grass-cutting blade unit has not been considered. However, this invention achieves weight reduction while ensuring strength.

[0013] Currently, nylon cords are widely used for brush cutting in environments with obstacles. While nylon cord cutters have advantages such as high safety and relatively light weight, they have challenges in terms of handling, cost, and environmental impact. [Means for solving the problem]

[0014] The invention described in claim 1 is a brush cutter blade unit comprising: a blade body that is axially attached to the periphery of a base plate, which is mounted on the rotating shaft of a machine through an axial insertion hole drilled in the center, and has an extended portion that is bent and extended downward when viewed from the machine side to capture grass; a base plate having a plurality of cutting blades for cutting the grass captured by the extended portion and having holes attached to each of the cutting blades; and an axial attachment member that axially attaches the blade body to the holes in the base plate. The effect of this is, (1) Catching and cutting grass is an important condition for efficient brush cutting, and by bending the extension of the blade downward when viewed from the machine side, the extension is now able to catch grass. (2) By providing cutting blades on the base plate as well, the efficiency of mowing is improved by cutting the grass captured by the blade body with the cutting blades on the base plate. (3) Since the cutting blades on both the blade body and the base plate are used for mowing, the load on the cutting blades is reduced, and the efficiency of mowing is improved. And so on.

[0015] The invention described in claim 2 is a brush cutter unit according to claim 1, having a substrate from which the cutting blades protrude radially from the center of the substrate. The effect of this is, (1) The cutting blade can now have a cutting edge at any position from the center of the substrate to the outermost edge. (2) It became possible to reduce the weight of the substrate while maintaining its strength. And so on.

[0016] The invention described in claim 3 is a brush cutter unit according to claim 2, wherein the substrate has the cutting edge of the cutting blade provided from the center to the outermost edge of the substrate. The effect of this is, (1) Because grass can be mowed from the center of the substrate to the outermost edge, the efficiency of mowing is improved and the amount of grass left uncut is reduced. (2) In particular, the cutting edge at the center of the base plate suppresses grass from getting tangled around the rotating axis of the machine, thus reducing the decrease in efficiency of the mowing work. And so on.

[0017] The invention described in claim 4 is a brush cutter unit according to claim 3, wherein the substrate has the hole located between the cutting edges of two adjacent cutting blades on the circumference of the substrate. The effect of this design is that by positioning the blade body between the cutting edges of two adjacent cutting blades, it becomes possible to efficiently capture grass and cut it efficiently with the cutting blades on the base, thereby improving the efficiency of grass cutting work.

[0018] In the invention according to claim 5, the mowing blade unit according to claim 3, comprising a substrate mounted on the rotating shaft of the machine, wherein the cutting edge of the substrate has a cutting edge on the left side when viewed from the machine side. The effect thereof is that the rotating shaft of the current mower is made to rotate counterclockwise when viewed from the machine side, and the mowing operation is performed by moving the mowing blade mounted on the machine from the right side to the left side when viewed from the machine side while mowing the grass. Therefore, efficient mowing work can be achieved by providing a cutting edge on the left side of the cutting blade of the substrate when viewed from the machine side.

[0019] In the invention according to claim 6, the mowing blade unit according to claim 1, comprising a blade body having a cutting edge on the extending portion, and the edge of the cutting edge of the extending portion is arc-shaped when viewed from the machine side. The effect thereof is that the inhibition of the movement of the blade body by an obstacle when the edge of the cutting edge of the blade body collides with the obstacle is significantly reduced because the edge of the cutting edge of the blade body is arc-shaped compared to the case where the edge of the cutting edge of the blade body is angular.

[0020] In the invention according to claim 7, the mowing blade unit according to claim 1, comprising a blade body having a shaft mounting hole for mounting the blade body on the substrate, and the shaft mounting hole is an elongated hole. The effect thereof is that when the edge of the cutting edge of the blade body collides with an obstacle, the blade body movable in the long axis direction of the elongated hole is significantly less likely to be inhibited from moving by the bolt for axially mounting the blade body on the substrate compared to the case where the shaft mounting hole is a round hole.

[0021] In the invention according to claim 8, the mowing blade unit according to claim 6, comprising a blade body having a shaft mounting hole for mounting the blade body on the substrate, and the shaft mounting hole is the elongated hole. The effect of this design is that when the edge of the cutting blade collides with an obstacle, the arc shape of the cutting blade edge allows the blade's movement to continue significantly more easily compared to when it is angular. Furthermore, the elongated mounting hole compared to when it is round significantly reduces the likelihood of the bolt obstructing the blade's movement. If the blade's movement continues, the movement of the brush cutter unit also continues, reducing impact and kickback, which is the reaction force of a collision, making brush cutting easier in environments with obstacles.

[0022] The invention described in claim 9 is a brush cutter blade unit according to claim 8, wherein the blade body is rotatably mounted on the substrate and movable in the longitudinal direction of the elongated hole. The effect of this is that when the edge of the blade collides with an obstacle, the rotation of the blade around the bolt is not hindered because the blade is rotatable, and the movement of the blade in the direction of the long axis of the elongated hole that serves as the pivot point is also not hindered, resulting in the continued movement of the brush cutter blade unit.

[0023] The invention described in claim 10 is a brush cutter blade unit according to claim 6, wherein the blade body has the cutting blade on the left side when viewed from the machine side. The effect of this is that the rotation axis of current brush cutters is designed to rotate counterclockwise when viewed from the machine side, and the cutting operation involves moving the cutting blade attached to the machine from right to left when viewed from the machine side to cut the grass. Therefore, by placing the cutting blade on the left side of the blade body when viewed from the machine side, efficient brush cutting work can be performed.

[0024] The invention described in claim 11 is a brush cutter blade unit according to claim 9, wherein the blade body is rotatably mounted on the substrate and movable in the longitudinal direction of the elongated hole, with a narrow axial gap between the bolts. The effect of this is that when the edge of the blade collides with an obstacle and the blade moves along the long axis of the elongated hole which is the mounting hole, the blade, which is mounted with a narrow axial gap for the bolt, makes surface contact with the base plate, resulting in less friction and not hindering the blade's movement along the long axis of the elongated hole which is the mounting hole.

[0025] The invention described in claim 12 is a brush cutter unit according to claim 2, having a substrate attached to the cutting blade, with a semicircular center having the hole, which is a round hole, drilled in it. The effect of this is that by drilling round holes in the cutting blade of the thin substrate, which minimize the reduction in strength compared to elongated holes, and drilling them in the semi-circular center that provides both strength and weight reduction, it was possible to ensure the strength required for substrates while also reducing their weight.

[0026] The invention described in claim 13 is a brush cutter blade unit according to claim 6, comprising a blade body having a cutting blade whose cutting edge is on the upper surface side of the extended portion when viewed from the machine side. The benefits of this design are that, because the cutting edge of the blade body of the brush cutter unit is positioned on the upper side of the extension, contact with the ground is suppressed, resulting in less wear on the cutting edge. Furthermore, because the cutting edge of the blade is angled downwards, it is possible to suppress the scattering of soil and stones towards the machine user. [Effects of the Invention]

[0027] This brush cutter unit achieves efficient brush cutting through two characteristics: capturing and cutting grass, and cutting with both the blade body and the base plate. It can be used even in environments with obstacles, and achieves brush cutting efficiency, ease of handling, and cost-effectiveness superior to nylon cord. Furthermore, because it is made entirely of metal, it has no environmental impact. [Brief explanation of the drawing]

[0028] [Figure 1] This is an overall perspective view showing the rotation direction and the direction in which the blade moves when using the embodiment of this invention. [Figure 2] (2-a) is a top view, (2-b) is a front view, and (2-c) is a bottom view of the blade body of the present embodiment, from top to bottom. [Figure 3] This is a plan view of the substrate according to the present embodiment. [Figure 4] This is a diagram illustrating the procedure for attaching the blade shaft to the substrate. [Figure 5](5-a) is a front view and (5-b) is a bottom view of the brush cutter blade unit of the present embodiment, from top to bottom. [Figure 6] This is a perspective view of an example of a usable blade. [Figure 7] These are diagrams illustrating the differences in the grass-catching surface due to the degree of bending of the extended portion of the blade. (7-a) This diagram shows that the position of the blade differs depending on whether or not mowing is being performed. (7-b) This diagram shows the grass-catching surface of a blade with a large degree of bending of the extended portion of the blade. (7-c) This diagram shows the grass-catching surface of a blade with a small degree of bending of the extended portion of the blade. [Figure 8] This diagram illustrates the capture and cutting of grass when using the embodiment of the present invention. (8-a) A diagram illustrating the process of cutting and capturing grass with the blade, cutting the captured grass with the cutting blade of the base plate, and the direction in which the blade moves. (8-b) A perspective view of the blade in (8-a) above. [Figure 9] This diagram illustrates how the impact is mitigated when the blade collides with an obstacle. (9-a) Diagram showing a blade with a square edge on the second cutting edge and a round axial mounting hole colliding with an obstacle. (9-b) Diagram illustrating the movement of the blade in the case of (9-a) above. [Figure 10] This diagram illustrates how the impact is mitigated when the blade collides with an obstacle. (10-a) Diagram showing a blade with an arc-shaped edge on the second cutting edge and a round hole for the pivot point colliding with an obstacle. (10-b) Diagram illustrating the movement of the blade in the case of (10-a) above. [Figure 11] This diagram illustrates how the impact is mitigated when the blade collides with an obstacle. (11-a) Diagram showing a blade with an arc-shaped edge on the second cutting edge and an elongated mounting hole colliding with an obstacle. (11-b) Diagram illustrating the movement of the blade in the case of (11-a) above. [Figure 12] This diagram illustrates how the movement of the pivot member differs depending on the type of hole and pivot hole when the blade body, upon collision with an obstacle, moves along the long axis of the elongated hole which serves as the pivot hole. (12-a) When the pivot hole of the blade body is an elongated hole and the hole in the base plate is a round hole. (12-b) In the case of (12-a) above, only the blade body moves and the pivot member does not move. (12-c) When the pivot hole of the blade body is a round hole and the hole in the base plate is an elongated hole. (12-d) In the case of (12-c) above, both the blade body and the pivot member move. [Figure 13] This diagram illustrates how the contact between the blade and the substrate differs depending on the axial gap of the bolt when the blade, having collided with an obstacle, moves along the long axis of the elongated hole which is the pivot hole. (13-a) When the gap is narrow, the blade and the substrate make surface contact. (13-b) When the gap is wide, surface contact between the blade and the substrate is difficult. [Figure 14] This diagram illustrates the difference in how grass wraps around the gear case depending on whether the cutting edge of the first cutting blade extends from the center to the periphery of the substrate or is only present at the periphery of the substrate. (14-a) When the cutting edge extends from the center to the periphery of the substrate, grass is less likely to wrap around it. (14-b) When the cutting edge is not in the center of the substrate but only at the periphery, grass is more likely to wrap around it. [Figure 15] This diagram illustrates how the scattering of soil and rocks and the wear of the blade edge differ depending on the orientation of the cutting edge of the blade body when using the present invention's brush cutter blade unit. (15-a) Diagram showing soil and rocks being scattered towards the worker by the cutting edge of the blade body. (15-b) When the cutting edge of the cutting blade is on the upper side of the extension (cutting edge is angled downward), soil and rocks are more likely to be scattered angled downward. (15-c) When the cutting edge of the cutting blade is on the lower side of the extension (cutting edge is angled upward), soil and rocks are more likely to be scattered angled upward (towards the worker). [Modes for carrying out the invention]

[0029] The present invention's brush cutter unit is mounted on the rotating shaft of a machine through an axial insertion hole drilled in the center of the base plate, and cuts grass using multiple first cutting blades provided on the base plate and multiple second cutting blades attached to holes in the first cutting blades.

[0030] The blade body, which is pivotally attached to the substrate mounted on the machine, is bent and extended downwards when viewed from the machine side, the edge of the second cutting blade in the extended portion is arc-shaped, and the pivot hole for the blade body to be pivotally attached to the substrate is an elongated hole.

[0031] The present invention comprises a base plate, a blade body axially attached to the base plate, and a mounting member, wherein the blade body axially attached to the base plate is rotatable around a bolt and movable in the longitudinal direction of the elongated hole which is the mounting hole.

[0032] If no vibration occurs when using the present invention's brush cutter blade unit, the number of blades attached to the first cutting blade on the base plate and the holes in the first cutting blade may be odd, but it is preferable to have an even number and to arrange them symmetrically with respect to the center of the base plate and evenly on the circumference of the base plate. [Examples]

[0033] The present invention will be described in the case where the number of first cutting blades 20 and blade bodies 30 is four. (Figure 1)

[0034] In the present invention, the brush cutter blade unit has a base plate 10 mounted on the gear case 51 of the machine 50, the base plate has the first cutting blade 20, and the blade body 30 is pivotally attached to the first cutting blade by a pivoting member 40. (Figure 1)

[0035] In the present invention's brush cutter blade unit in use, when the first cutting blade 20 is viewed from the machine 50 side, the left side is the first cutting edge 21. (Figure 1)

[0036] The present invention's brush cutter blade unit rotates in the rotational direction 61 while in use, and the blade body 30 is rotatable around the bolt 44 63 and, to a limited extent, can move linearly 64. (Figure 1)

[0037] The blade body 30 consists of a pivot portion 31 and an extension portion 33. When the brush cutter blade unit of this invention is in use, the extension portion is bent and extended downward when viewed from the machine 50 side, and the left side is the second cutting blade 34. (Figure 1)

[0038] When the present invention's brush cutter blade unit is in use, the edge 35 of the second cutting blade 34 of the blade body 30 has an arc shape. (Figure 1)

[0039] When using the present invention's brush cutter blade unit, the second cutting edge 361 of the blade body 30 is provided on the upper surface side of the extension portion 33 when viewed from the machine 50 side. (Figure 1, Figure 2)

[0040] A long hole, known as a mounting hole 32, is drilled in the mounting portion 31, with its long axis aligned with the longitudinal direction of the blade body 30. (Figure 2)

[0041] A shaft insertion hole 11 is drilled in the center of the substrate 10, and the first cutting blade 20 protrudes radially from the center of the substrate and is evenly distributed on the circumference of the substrate. (Figure 3)

[0042] The first cutting edge 21 of the first cutting blade 20 extends from the center of the substrate 10 to the outermost edge 22. (Figure 3)

[0043] Hole 23 is a circular hole drilled in the semicircular center attached to the first cutting blade 20. (Figure 3)

[0044] The hole 23 is drilled between two adjacent first cutting edges 21 on the circumference of the substrate 10. (Figure 3)

[0045] The blade body 30 is attached to the base plate 10 by arranging the components in the following order from top to bottom when viewed from the machine 50 side when using the present invention's brush cutter blade unit: nut 41, first washer 42, hole 23, mounting hole 32, and second washer 43, and then the bolt 44 is passed through from bottom to top and the nut is tightened. (Figure 4)

[0046] The blade 30 is pivotally mounted to the substrate 10 such that it can rotate freely around the bolt 44 and move freely in a straight line along the long axis of the elongated hole, which is the pivot hole 32. (Figure 5)

[0047] An example of a usable blade 30 is shown in a perspective view. (Figure 6)

[0048] The blade body 30 of the present invention's brush cutter blade unit in use is in position 37 when not cutting, and in position 38 when cutting. (7-a)

[0049] As can be seen from the diagram showing the blade body line 71 as viewed from the direction of movement 62 of the brush cutter blade unit of this invention during brush cutting, the degree of bending of the extension portion 33 is large (the angle 72A between the pivot portion 31 and the extension portion is small), and the surface 73A that catches grass is wide. (7-a 7-b)

[0050] As can be seen from the line of sight 71 of the blade body as viewed from the direction of movement 62 of the brush cutter blade unit of this invention during brush cutting, when the blade body 30 at position 38 is viewed, the degree of bending of the extended portion 33 is small (the angle 72B between the pivot portion 31 and the extended portion is large), the surface 73B that catches grass is narrow. (7-a 7-c)

[0051] The wider the grass-catching surface of the blade 30, the more grass it can catch. Therefore, a blade with a greater degree of bending in the extended portion 33 can catch grass 90 better, and the first cutting blade 20 cuts the caught grass 92, resulting in efficient mowing work where the grass 93 is cut by the mowing blade unit together with the grass 91 cut by the blade. (8-a 8-b)

[0052] The blade 30 cuts and captures the grass 90, and has functions such as mitigating the impact when it collides with an obstacle 81. (8-a 8-b)

[0053] Consider the case where the blade body 30, in which the edge portion 35 of the second cutting blade 34 is angular and the shaft mounting hole 32 is a round hole, collides with the obstacle 81 at its edge while rotating in the direction of rotation 61. (9-a)

[0054] Because the edge portion 35 is angular, the movement of the blade body 30 is obstructed by the obstacle 81, and because the shaft mounting hole 32 is round, the movement of the blade body is also obstructed by the bolt 44, and the movement of the brush cutter blade unit of this invention is also obstructed, causing the kinetic energy to generate a large impact. (9-b)

[0055] Consider the case where the blade body 30, whose edge 35 of the second cutting blade 34 is arc-shaped and whose shaft mounting hole 32 is a round hole, collides with the obstacle 81 at its edge while rotating in the direction of rotation 61. (10-a)

[0056] Because the edge portion 35 is arc-shaped, the movement of the blade body 30 is not easily obstructed by the obstacle 81. However, because the shaft mounting hole 32 is a round hole, the movement of the blade body is obstructed by the bolt 44, and the movement of the brush cutter blade unit of this invention is also obstructed, causing the kinetic energy to generate a large impact. (10-b)

[0057] Consider the case where the blade body 30, in which the edge portion 35 of the second cutting blade 34 is arc-shaped and the shaft mounting hole 32 is an elongated hole, collides with the obstacle 81 at its edge while rotating in the direction of rotation 61. (11-a)

[0058] Because the edge portion 35 is arc-shaped, the movement of the blade body 30 is less likely to be obstructed by the obstacle 81, and because the shaft mounting hole 32 is elongated, the movement of the blade body is less likely to be obstructed by the bolt 44, and as a result, the movement of the brush cutter blade unit of this invention continues and the kinetic energy it possesses does not generate a large impact. (11-b)

[0059] When the blade body 30, whose mounting hole 32 is an elongated hole, is mounted to the substrate 10, whose hole 23 is a round hole, and moves linearly 64 to position 301, the mounting member 40 (the nut 41, the first washer 42, the second washer 43, and the bolt 44) does not move, and only the blade body moves, making linear movement easier. Furthermore, since no elongated hole is drilled in the substrate, a decrease in the strength of the substrate can be suppressed. (12-a 12-b)

[0060] When the blade body 30, whose mounting hole 32 is a round hole, is mounted to the substrate 10, whose hole 23 is an elongated hole, and moves linearly 64 to the position 301, the mounting member 40 (the nut 41, the first washer 42, the second washer 43, and the bolt 44) also moves with the blade body, making linear movement difficult. Furthermore, the strength of the substrate is greatly reduced due to the drilling of an elongated hole in the substrate. (12-c 12-d)

[0061] When the blade body 30, which is pivotally mounted to the substrate 10 with a narrow axial gap between the bolt 44 and the substrate, moves linearly 64 to the position 301, the blade body makes surface contact with the substrate, reducing the resistance to the linear movement and not hindering the linear movement; therefore, a narrow gap is preferable. (13-a)

[0062] When the blade body 30, which is pivotally attached to the substrate 10 with a wide axial gap between the bolt 44 and the substrate, moves linearly 64 to the position 301, the blade body does not make surface contact with the substrate, resulting in high resistance to the linear movement and hindering the linear movement. Therefore, a wide gap is undesirable. (13-b)

[0063] When the first cutting edge 21 of the first cutting blade 20 extends from the center of the substrate 10 to the outermost edge 22, grass can be cut from the center of the substrate to the outermost edge, making it less likely for grass to wrap around the gear case 51. (14-a)

[0064] If the first cutting edge 21 of the first cutting blade 20 is located only on the outer periphery of the substrate 10, grass cannot be cut in the center of the substrate where the first cutting edge is absent, making it easier for grass to wrap around the gear case 51. (14-b)

[0065] This is a type of mowing operation where a lot of soil and rocks (82) are scattered towards the user of the present invention's brush cutter blade unit. (15-a)

[0066] When the second cutting edge 361 of the second cutting blade 34 is on the upper side of the extension 33 when the present invention's brush cutter unit is in use, the cutting edge 362 of the second cutting blade is angled downward when viewed from the machine 50, so there is less scattering of soil and stones 82 to the user, and the contact of the second cutting edge with the ground is also less compared to when the second cutting edge is on the lower side of the extension, thus suppressing wear of the second cutting edge. Therefore, it is preferable to provide the second cutting edge on the upper side of the extension. (15-a 15-b)

[0067] When the second cutting edge 361 of the second cutting blade 34 is located on the lower side of the extension 33 when the present invention's brush cutter unit is in use, the cutting edge 362 of the second cutting blade faces diagonally upward when viewed from the machine 50, resulting in increased scattering of soil and rocks 82 to the user. Furthermore, the contact between the second cutting edge and the ground is greater compared to when the second cutting edge is located on the upper side of the extension, making the second cutting edge more prone to wear. Therefore, it is undesirable to position the second cutting edge on the lower side of the extension. (15-a 15-c) [Industrial applicability]

[0068] The present invention's brush cutter blade unit and blade body demonstrate their characteristics in brush cutting operations in agriculture, forestry, and environmental maintenance work, particularly in environments with obstacles such as stones, concrete, and metal, providing superior brush cutting operations in terms of workability, economy, and safety. [Explanation of symbols]

[0069] 10 circuit boards 11. Shaft insertion hole 20 1st cutting blade 21 First cutting edge 22. Outermost edge 23 holes 30 Blade 301 Position where the blade body moves linearly along the long axis of the elongated hole which is the pivot hole. 31 Shaft attachment part 32 Shaft mounting hole 33 Extension section 34 2nd cutting blade 35 Edge 361 Second cutting edge 362 Cutting edge 37. Position of the blade when the brush cutter blade unit is not cutting. 38. Position of the blade when the brush cutter blade unit is in use and cutting. 40. Mounting components (nut, first washer, second washer, bolt) 41 Nuts 42. First Washer 43. Second Washer 44 volts 45 bolt cross-section 50 machines 51 Gear Case 61 Rotation direction of the brush cutter blade unit in use 62 Direction of movement of the brush cutter blade unit during brush cutting. 63 Movement of the bolts around the blade body while the brush cutter blade unit is in use. 64. Movement of the axial mounting hole (elongated hole) of the blade body while the brush cutter blade unit is in use. 65 Direction of blade movement during use of the brush cutter blade unit 71 The blade body (38) as seen from the direction of movement (62) of the brush cutter blade unit in use. 72A Angle between the pivot point and the extension when the degree of bending of the extension of the blade is large. 72B Angle between the pivot point and the extension when the degree of bending of the extension of the blade is small. 73A The degree of bending of the blade's extended portion and the grass-catching surface of the blade. 73B The grass-catching surface of the blade when the degree of bending of the extended portion of the blade is small. 81 Obstacles 82 Earth and stone 90 Grass before being captured and cut by the blade. 91 Grass cut by the blade 92 Grass captured by the blade 93 Grass cut by the brush cutter blade unit 94 Grass wrapped around the gear case of a machine

Claims

1. A blade body is attached to the periphery of a base plate, which is mounted on the rotating shaft of a machine through a centrally drilled shaft insertion hole, and has an extended portion that is bent downwards when viewed from the machine side to capture grass. The substrate has a plurality of cutting blades for cutting away grass captured by the extension, and each of the cutting blades has a hole attached to it. A mounting member that pivotally mounts the blade body into the hole in the substrate, A brush cutter blade unit equipped with a cutting blade.

2. The brush cutter blade unit according to claim 1, having the substrate from which the cutting blades protrude radially from the center of the substrate.

3. The brush cutter blade unit according to claim 2, having a substrate on which the cutting edge of the cutting blade extends from the center to the outermost edge.

4. The brush cutter blade unit according to claim 3, comprising a substrate having the hole located midway between the cutting edges of two adjacent cutting blades on the circumference of the substrate.

5. The brush cutter blade unit according to claim 3, wherein the substrate mounted on the rotating shaft of the machine has a cutting blade on the left side when viewed from the machine side.

6. The brush cutter blade unit according to claim 1, comprising a blade body having a cutting blade in the extended portion, wherein the edge of the cutting blade is arc-shaped when viewed from the machine side of the extended portion.

7. The brush cutter blade unit according to claim 1, wherein the blade body that is axially attached to the substrate has an elongated mounting hole for the blade body.

8. The brush cutter blade unit according to claim 6, wherein the blade body that is axially attached to the substrate has an elongated hole for axial attachment of the blade body.

9. The brush cutter blade unit according to claim 8, further comprising the blade body rotatably mounted on the substrate and movable in the longitudinal direction of the elongated hole.

10. The brush cutter blade unit according to claim 6, wherein the blade body has the cutting blade on the left side when viewed from the machine side of the extension portion.

11. The brush cutter blade unit according to claim 9, wherein the blade body is rotatably mounted on the substrate and movable in the longitudinal direction of the elongated hole, with a narrow gap in the axial direction of the bolt.

12. The brush cutter unit according to claim 2, having the substrate attached to the cutting blade, with the semicircular center of which the circular hole is drilled.

13. The brush cutter blade unit according to claim 6, comprising a blade body having a cutting blade whose cutting edge is on the upper surface side of the extended portion when viewed from the machine side.

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