JP4139768B2 - Cutting blade rotor - Google Patents

Description

  The present invention relates to a cutting blade rotating body mounted on a portable brush cutter used for mowing and the like.

  As a cutting blade rotating body used by being mounted on a conventional brush cutter, for example, there is one shown in FIG. 8 (see, for example, Patent Document 1). The cutting blade rotating body 1 includes a disc-shaped base 2, and an annular outer peripheral plate 3 is provided on the upper surface of the base 2. The outer peripheral plate 3 is formed with a plurality of pairs of insertion holes 4 and 4 extending radially from the center side, and the insertion holes 4 and 4 forming these pairs are cutting blades for cutting grass or the like. Nylon cord 5 is inserted. FIG. 8 shows a pair of insertion holes 4 and 4. The nylon cord 5 inserted into the pair of insertion holes 4 and 4 is formed in a predetermined length, and each end side portion 5a and 5a extends toward the outside of the cutting blade rotating body 1. Yes. And the center part of the nylon cord 5 is arrange | positioned as the U-shaped folding | returning part 6 exposed from the center side opening part opened toward the center of the cutting blade rotary body 1 of the penetration holes 4 and 4 which make a pair. . The folded portion 6 is in contact with a protrusion 7 formed on the upper surface of the base 2, and is pressed toward the inner peripheral edge 3 a of the outer peripheral plate 3 by the protrusion 7.

  As shown in FIG. 8, the protrusion 7 pushes the folded portion 6 of the nylon cord 5 toward the inner peripheral edge 3 a of the outer peripheral plate 3, so that each of the pair of insertion holes 4, 4 in the folded portion 6. The curvature radii of the two bent portions 8 and 8 that are bent in the vicinity of the central opening can be reduced. Accordingly, when one end side portion 5a of the nylon cord 5 is pulled outward, the cord 5 is caused by frictional resistance between the bent portions 8 and 8 and the opening edge on the center side of the insertion holes 4 and 4. Can be prevented from easily coming out of the opening facing the outside of the insertion hole 4. Therefore, it is possible to prevent the operation such as mowing from being interrupted when the cord 5 is detached from the cutting blade rotating body 1.

Next, for example, when the used nylon cord 5 attached to the pair of insertion holes 4 and 4 is replaced with a new one, it is necessary to remove the used cord 5 from the insertion holes 4 and 4. At that time, first, for example, one end side portion 5 a of the cord 5 is pushed into the insertion hole 4, and the folded portion 6 is removed from the protrusion 7. Then, it is possible to remove the cord 5 by pulling the cord 5 from the center opening of the insertion holes 4 and 4 by gripping the folded portion 6 detached from the protrusion 7 with a finger.
JP 2000-83439 A

  However, in the conventional cutting blade rotator 1 shown in FIG. 8, when the nylon cord 5 is removed from the cutting blade rotator 1, it is necessary to pick up the folded portion 6 that is detached from the protrusion 7. Since the cutting blade rotating body 1 is in contact with the upper surface 2a of the base 2 or is disposed close to the upper surface 2a, there is a problem that it is difficult to pick the folded portion 6 with a finger. Therefore, the nylon cord 5 cannot be easily pulled out from the insertion holes 4 and 4. In addition, when the worker wears gloves, this work becomes more difficult.

  The present invention has been made to solve the above-described problems. When a flexible wire blade is attached and used for mowing or the like, the flexible wire blade is difficult to come off, and For example, when exchanging a flexible linear blade, an object is to provide a cutting blade rotating body that allows an operator to easily remove the mounted flexible linear blade.

The cutting blade rotating body of the invention according to claim 1 is a cutting blade rotating body that is used by attaching a flexible wire blade and attached to a brush cutter, and a board main body rotated by the brush cutter, A projection provided on the surface, a pair of insertion holes provided on the projection and penetrating from the center of rotation toward the outside and through which the flexible wire blade is inserted, and a rotation center of the pair of insertion holes A bending protrusion provided between the side openings, and bending the bent portion of the flexible linear blade exposed from each rotation center side opening in a direction away from the surface of the panel body , The bending protrusion is characterized in that its width becomes narrower from the center of rotation toward the outside .

When attaching a flexible linear blade to the cutting blade rotating body according to any one of claims 1 to 4 , the flexible linear blade is formed to a predetermined length, and both ends of the flexible linear blade are cutting blades. The pair of insertion holes are inserted so as to extend outward in the radial direction of the rotating body. In this state, the folded portion of the flexible linear blade exposed from each rotation center side opening of the pair of insertion holes is arranged in a state straddling the bending protrusion, and the bending protrusion protrudes from the surface of the board body. It is bent in the direction of pulling away. In this state, when both ends of the flexible linear blade are pulled outward in the radial direction of the cutting blade rotating body, each central opening of the pair of insertion holes of the folded portion of the flexible linear blade is opened. A bent portion is formed at each portion of the portion and at a portion of the bending protrusion. These bent portions generate frictional resistance between the center opening edge of each insertion hole and the bending projection when one end of the flexible linear blade is pulled outward. The flexible linear blade can be prevented from easily coming out of the opening portion facing the outside of the insertion hole.

  Next, when the operator removes the flexible linear blade mounted on the cutting blade rotating body, for example, first, one end side portion of the flexible linear blade is pushed into the corresponding insertion hole and turned back. Pull the part away from the bending projection. In this state, the folded portion is originally separated from the surface of the board main body by the bending projection itself, or is further separated from the surface of the board main body by being separated from the bending projection. Therefore, when the folded portion is picked with a finger, the board body does not get in the way, and the folded portion can be easily picked. Therefore, the folded portion can be easily picked with a finger, and the flexible linear blade can be pulled out from the rotation center side opening of the insertion hole and removed.

And according to the cutting blade rotary body of the invention which concerns on Claim 1, when the edge part of a flexible wire blade is pulled toward the outer side, the width | variety of the protrusion for bending becomes narrow as it goes outside. Therefore, the folded portion has a small frictional resistance with the bending projection when moving outward along the bending projection, and can easily move outward. Therefore, the radius of curvature of each bent portion is reduced, and the flexible linear blade can be made difficult to come out from the outer opening of the insertion hole. And since the width | variety protrusion is wide as it goes to the rotation center side, resistance when a folding | turning part moves toward a center side is large, and the movement to a center side can be prevented. Therefore, it is possible to prevent the flexible wire blade from coming out of the rotation center side opening of the insertion hole.

The cutting blade rotator of the invention according to claim 2 is a cutting blade rotator that is used with a flexible linear blade attached to a brush cutter, and a board body that is rotated by the brush cutter; A projection provided on the surface, a pair of insertion holes provided on the projection and penetrating from the center of rotation toward the outside and through which the flexible wire blade is inserted, and a rotation center of the pair of insertion holes A bending protrusion provided between the side openings, and bending the bent portion of the flexible linear blade exposed from each rotation center side opening in a direction away from the surface of the panel body, The bending projection is characterized in that the edge in the width direction of the upper surface is formed as a corner .

According to the cutting blade rotating body of the invention according to claim 2, the corner portion formed at the edge in the width direction of the bending protrusion is formed in the portion straddling the bending protrusion in the folded portion of the flexible linear blade. Thus, a bent portion having a relatively small radius of curvature can be formed. As a result, it is possible to more strongly prevent the flexible wire blade from coming out of the outer opening of the insertion hole.

A cutting blade rotator according to a third aspect of the present invention is a cutting blade rotator that is used by attaching a flexible wire blade to a brush cutter, and a board body rotated by the brush cutter; A projection provided on the surface, a pair of insertion holes provided on the projection and penetrating from the center of rotation toward the outside and through which the flexible wire blade is inserted, and a rotation center of the pair of insertion holes A bending protrusion provided between the side openings, and bending the bent portion of the flexible linear blade exposed from each rotation center side opening in a direction away from the surface of the panel body, The bending protrusion is formed as a reinforcing portion of the panel main body. Thereby, the mechanical strength of the cutting blade rotating body can be improved by the bending protrusion.

The cutting blade rotator according to claim 4 is the cutting blade rotator according to any one of claims 1 to 3, wherein the bending projection includes a portion of the disc body as it goes toward the center of rotation of the disc body. An inclined surface that is inclined in a direction away from the surface is formed. Thereby, for example, when the cutting blade rotating body rotates and the end of the flexible linear blade is pulled outward, the folded portion of the flexible linear blade goes down the inclined surface, Since the frictional resistance with the inclined surface is reduced, it can be easily moved outward. Accordingly, the radius of curvature of each bent portion formed in the folded portion of the flexible linear blade is reduced, and the flexible linear blade can be prevented from easily coming out of the outer opening of the insertion hole. And since an inclined surface works so that a folding | turning part may stop the movement to the direction toward a rotation center, it can prevent that a flexible wire blade slips out from the rotation center side opening part of an insertion hole.

  According to this invention, a bending part can be formed also in the location of the protrusion part for bending other than each location of each rotation center side opening part of a pair of insertion hole among the folding | returning parts of a flexible wire blade. Accordingly, the frictional resistance when the flexible wire blade comes out from the outer opening of the pair of insertion holes is increased by the increase in the bent portion due to the bending projection, whereby the flexible wire blade is inserted into the insertion hole. Can be reliably prevented from coming out of the outer opening. Therefore, when this cutting blade rotating body is used for a brush cutter, it is possible to prevent the flexible linear blade from being detached from the cutting blade rotating body and interrupting operations such as mowing.

  Since the operator can easily remove the flexible linear blade attached to the cutting blade rotating body from the center side opening of the insertion hole, for example, the used attached to the cutting blade rotating body. It is possible to quickly replace the flexible linear blade and the unused flexible linear blade. Therefore, working efficiency such as mowing can be improved.

  Hereinafter, an embodiment of a cutting blade rotating body according to the present invention will be described with reference to FIG. 1 (A), FIG. 1 (B) and the like. This cutting blade rotating body 11 is used by being attached to a portable brush cutter 12 used for mowing, etc., and is equipped with a flexible linear blade 13 as a cutting blade for mowing grass or the like. used. The cutting blade rotating body 11 includes a panel main body 14.

  As shown in FIGS. 1 (A) and 1 (B), the panel main body 14 is a disk-shaped member. A boss part 15 is formed at the center, and an attachment hole 15a is formed at the center of the boss part 15. Has been. As shown in FIG. 1B, the attachment hole 15a is for attaching the blade cutting body 11 to a rotary shaft 12a connected to an engine provided in the brush cutter 12. That is, the rotary shaft 12a is provided with a male screw 12b at the tip, the male screw 12b is inserted into the mounting hole 15a, and a nut 12c is screwed into the male screw 12b. The cutting blade rotating body 11 can be attached to the rotary shaft 12a by sandwiching and tightening the upper wall 15b of the boss portion 15 between the nut 12c and the bowl-shaped portion 12d formed on the rotary shaft 12a. . Thereby, the cutting blade rotating body 11 rotates with the rotating shaft 12a. The nut 12 c is accommodated in a recess 15 c formed on the bottom surface of the boss portion 15.

  And as shown to FIG. 1 (A) and FIG. 1 (B), the outer peripheral wall 16 is formed in the upper surface of the outer periphery of the panel main body 14 (refer FIG. 4). The outer peripheral wall 16 is provided with two protrusions 17 and 17 at positions facing each other with the boss portion 15 therebetween. Here, since the cutting blade rotating body 11 is formed symmetrically as shown in the respective drawings, the corresponding parts on the left side and the right side are indicated by the same reference numerals, and the left side part is shown. Explain and omit the explanation of the right part.

  As shown in FIG. 1A, the left protrusion 17 is formed with a pair of insertion holes 18 and 18. These two insertion holes 18 and 18 are for inserting the flexible linear blade 13, and penetrate from the boss portion 15 side of the protrusion 17 to the outer peripheral surface 16 a side of the cutting blade rotating body 11. . The pair of insertion holes 18, 18 are spaced apart from each other, are parallel to the radial straight line 39 of the cutting blade rotating body 11, and have the same height from the upper surface 14 a of the bottom wall of the panel body 14. Formed in position.

  As shown in FIG. 1A, between the projection 17 and the boss portion 15, a bending projection 19 is provided on the upper surface 14a of the panel body 14 to connect the two to each other. The cross-sectional shape of the bending projection 19 is substantially trapezoidal (see FIGS. 2 and 3), and is formed so that the lateral width decreases from the boss 15 side toward the outside in the radial direction. That is, on the upper surface (inclined surface 20) of the bending projection 19, the width B1 of the portion coupled to the protrusion 17 is narrower than the width B2 of the portion coupled to the boss portion 15. The position at which the bending projection 19 is coupled to the projection 17 is between the boss portion side opening (rotation center side opening) 21 of the two insertion holes 18. The side surface 22 on the boss portion side of the projection 17 to which the bending projection 19 is coupled is formed as a flat surface.

  Further, as shown in FIG. 1B, the upper surface of the bending projection 19 is formed as an inclined surface 20. The inclined surface 20 is inclined in a direction away from the top surface 14 a of the bottom wall as it goes from the protrusion 17 toward the boss portion 15, and the portion coupled to the protrusion 17 has the same height H1 as the upper surface of the protrusion 17. Is formed. And the part couple | bonded with the boss | hub part 15 is formed in the same height H2 (> H1) as the upper surface of the boss | hub part 15. FIG. And as shown in FIG. 3, each edge part of the both sides of the width direction of this inclined surface 20 is formed as the corner | angular part 23. As shown in FIG.

  Further, as shown in FIGS. 1A and 1B, a concave groove 24 is provided on the upper surface 14 a of the panel body 14. Each concave groove 24 extends from the boss part side opening 21 of each of the two insertion holes 18 in the extending direction of the corresponding insertion hole 18 and terminates in front of the boss part 15. The concave groove 24 is for facilitating the operation when the flexible wire blade 13 is inserted into or removed from each insertion hole 18.

  As shown in FIG. 1A, each of the two insertion holes 18 opens at the outer peripheral surface 16a of the outer peripheral wall 16, and the guide surface for guiding the flexible linear blade 13 at each outer opening edge. 25 and 26 are provided. For example, when the cutting blade rotator 11 is rotationally driven by the brush cutter 12, the guide surfaces 25 and 26 are formed so that the end side portions 27 and 27 of the flexible linear blade 13 inserted into the respective insertion holes 18 have outer peripheries. Although it bends in the direction along the outer peripheral surface 16a of the wall 16, the radius of curvature of the bent portion is made relatively large to prevent breakage at the bent portion.

  As shown in the plan view of FIG. 1A, the guide surfaces 25 and 26 are formed at intersections where the outer opening edges of the respective insertion holes 18 and the outer peripheral surface 16 a of the outer peripheral wall 16 intersect. In this embodiment, two guide surfaces 25, 25 positioned between the insertion hole 18 and the insertion hole 18 are formed as inclined surfaces, and two guide surfaces positioned outside the two insertion holes 18. 26 and 26 are formed as large curved arcuate curved surfaces. FIG. 5 shows a state in which each of the guide surfaces 25, 25, 26, 26 is viewed from the side surface of the cutting blade rotating body 11.

  The flexible linear blade 13 attached to the cutting blade rotating body 11 is a nylon cord formed in a predetermined length and has a rectangular cross-sectional shape. However, the material of the flexible wire blade 13 may be other than nylon, and the cross-sectional shape may be other than a rectangle, for example, a star shape or a triangle.

  When mowing or the like is performed using the cutting blade rotating body 11 configured as described above, as shown in FIGS. 1A and 1B, two pairs formed on the two protrusions 17 are formed. One flexible wire blade 13 is attached to each pair of insertion holes (18, 18) and (18, 18). With the two flexible linear blades 13 attached to the cutting blade rotating body 11 in this way, the four end side portions 27 of the flexible linear blade 13 extend outward from the cutting blade rotating body 11. ing. Then, the cutting blade rotating body 11 to which the flexible wire blade 13 is mounted in this manner is fastened and fixed to the rotating shaft 12a of the brush cutter 12 with a nut 12c as shown in FIG. Next, by driving the engine of the brush cutter 12 and rotating the cutting blade rotator 11, mowing or the like can be performed with the flexible linear blade 13 that rotates with the cutting blade rotator 11. In addition, since the space 29 exists between the boss part side opening 21 of each insertion hole 18 and the cover 28 of the brush cutter 12 in a state where the blade cutter rotating body 11 is attached to the brush cutter 12, the cutter blade rotates. The flexible linear blade 13 can be attached to or removed from the rotary blade rotating body 11 in any state before and after the body 11 is attached to the brush cutter 12.

  By the way, when the flexible wire blade 13 is attached to the cutting blade rotor 11, for example, one end of the flexible wire blade 13 is connected to one outer opening of the pair of insertion holes 18 and 18 shown in FIG. Inserted from the boss portion side opening 21 and inserted from the boss portion side opening 21, and inserted from the boss portion side opening 21 of the other insertion hole 18 and pulled out from the outer opening 30. In this state, the folded portion 31 of the flexible linear blade 13 exposed from each boss portion-side opening 21 of the pair of insertion holes 18 is disposed so as to straddle the bending projection 19, and the bending projection 19 Is bent upwardly away from the upper surface 14a of the board body 14. And in this state, when each end part side part 27 and 27 of the flexible linear blade 13 is pulled toward the radial direction outer side of the cutting blade rotary body 11, among the folding | returning parts 31 of this flexible linear blade 13 Two bent portions 32, 32 are formed at each location of the boss portion side openings 21, 21 of the pair of insertion holes 18 (see FIG. 1A), and the width of the inclined surface 20 of the bending projection 19 Bent portions 33, 33 are formed at the corners 23, 23 on both sides in the direction (see FIG. 3). These four bent portions 32, 32, 33, 33 are boss portion side opening edges of the respective insertion holes 18, 18 when one end side portion 27 of the flexible linear blade 13 is pulled outward. In addition, a frictional resistance is generated between each of the corner portions 23 and 23 of the bending projection 19 so that the flexible wire blade 13 does not easily come out of the outer opening 30 of the insertion hole 18. it can.

  In addition, as shown in FIG. 3, by forming both sides of the inclined surface 20 of the bending projection 19 as the corners 23, 23, a bent portion 33 formed in the folded portion 31 of the flexible linear blade 13, The radius of curvature of 33 can be made relatively small. As a result, it is possible to more strongly prevent the flexible wire blade 13 from coming out of the outer opening 30 of the insertion hole 18.

  As shown in FIG. 1B, the upper surface of the bending projection 19 is formed as an inclined surface 20 that is inclined in a direction away from the upper surface 14a of the panel main body 14 toward the boss portion 15. When the cutting blade rotating body 11 rotates and the end side portion 27 of the flexible linear blade 13 is pulled outward by centrifugal force or the like, the folded portion 31 of the flexible linear blade 13 is inclined to the inclined surface 20. It is possible to easily move outside in the direction of the arrow 34 while descending. That is, when the folded portion 31 moves in the direction of going down the inclined surface 20, the contact pressure (friction resistance) between the folded portion 31 and the bending projection 19 becomes small, so that the folded portion 31 can be easily moved outward. . As a result, the radius of curvature of each of the four bent portions 32, 32, 33, 33 formed in the folded portion 31 of the flexible linear blade 13 is reduced, and the flexible linear blade 13 opens outside the insertion hole 18. It acts to make it difficult to remove from the portion 30. And since the inclined surface 20 works so that the folding | returning part 31 stops the movement of the direction which goes to the boss | hub part 15 side, it can prevent that the flexible wire blade 13 slips out from the boss | hub part side opening part 21 of the penetration hole 18. .

  Further, as shown in FIG. 1A, since the width of the bending projection 19 becomes narrower toward the outside, the end side portion 27 of the flexible linear blade 13 is pulled outward. Sometimes, the contact pressure (friction resistance) with the bending projection 19 when the folded portion 31 moves outward along the bending projection 19 becomes small, and can easily move outward. Therefore, similarly to the above, the curvature radii of the respective bent portions 32, 32, 33, 33 are reduced, and the flexible linear blade 13 can be made difficult to come out from the outer opening 30 of the insertion hole 18. And since the protrusion 19 for bending becomes wide as it goes to the rotation center side, resistance when the folding | returning part 31 moves toward a center side is large, and can prevent the movement to a center side. . As a result, it is possible to prevent the flexible wire blade 13 from coming out of the boss portion side opening 21 of the insertion hole 18.

  Thus, according to the cutting blade rotating body 11, the two bent portions 32 of the boss portion side openings 21, 21 of the pair of insertion holes 18, 18 among the folded portions 31 of the flexible linear blade 13, In addition to 32, two bent portions 33, 33 can be formed at each corner 23, 23 of the inclined surface 20 of the bending projection 19, so that the flexible linear blade 13 comes out of the insertion hole 18. Is increased by the increase of the two bent portions 33, 33 by the bending protrusion 19, thereby reliably preventing the flexible linear blade 13 from coming out of the outer opening 30 of the insertion hole 18. it can. Therefore, when this cutting blade rotating body 11 is used for the brush cutter 12, it is possible to prevent the flexible linear blade 13 from being detached from the cutting blade rotating body 11 and interrupting operations such as mowing.

  The two bending protrusions 19 and 19 are formed along the radial direction so as to connect the boss 15 and the protrusions 17 and 17, so that the mechanical strength of the cutting blade rotating body 11 is increased. It can also serve as a reinforcing part (rib) that improves the strength.

  Next, when the operator removes the flexible linear blade 13 attached to the cutting blade rotating body 11, for example, first, one end side portion 27 of the flexible linear blade 13 is inserted into the corresponding insertion hole 18. The folded portion 31 is pulled away from the bending projection 19. In this state, the folded portion 31 is originally separated from the upper surface 14a of the panel main body 14 by the height H1 by the bending projection 19 itself, and is also separated from the bending projection 19 so as to be separated from the upper surface 14a of the panel main body 14. Since the board body 14 does not get in the way when the folding part 31 is picked with a finger, the folding part 31 can be easily picked with a finger. Accordingly, the operator can easily remove the flexible wire blade 13 by pulling it from the boss portion side opening 21 of the insertion hole 18 by simply picking the folded portion 31 with a finger.

  Accordingly, the operator can quickly exchange, for example, the used flexible linear blade 13 mounted on the cutting blade rotating body 11 and the unused flexible linear blade 13. Therefore, working efficiency such as mowing can be improved.

  However, in the above embodiment, as shown in FIG. 1B, the inclined surface 20 having a predetermined one inclination angle is formed on the upper surface of the bending projection 19, but instead, as shown in FIG. Alternatively, a portion on the protrusion 17 side of the upper surface of the bending projection 19 may be formed as the steeply inclined surface 35, and a portion on the boss portion 15 side may be formed as the gently inclined surface 36. By setting the portion on the projection 17 side to be the steeply inclined surface 35, the folded portion 31 can be further easily moved to the projection 17 side, and the movement to the boss portion 15 side can be further suppressed.

  And in the said embodiment, as shown to FIG. 1 (A), although the one flexible wire blade 13 was mounted | worn with respect to a pair of insertion holes 18 and 18, it replaces with this and shows in FIG. Thus, a total of four flexible linear blades 38 may be mounted on the cutting blade rotating body 11 by mounting one flexible linear blade 38 to one insertion hole 18. In this case, in order to prevent the flexible wire blade 38 from coming out of the outer opening 30 of the insertion hole 18, a retaining portion 37 is provided at the end of the flexible wire blade 38 on the boss portion 15 side. is there. The diameter of the retaining portion 37 is larger than the inner diameter of the insertion hole 18.

  In the above embodiment, as shown in FIG. 1B, the inclined surface 20 is formed on the upper surface of the bending projection 19, but the inclined surface 20 is omitted and the upper surface is the upper surface 14a of the panel main body 14. You may form as a surface parallel to.

  Further, in the above embodiment, as shown in FIG. 1A, the bending protrusion 19 is formed so that its width becomes narrower from the center of rotation toward the outside. The protrusion 19 may be formed to have a certain width.

  In the above embodiment, each edge in the width direction of the inclined surface 20 of the bending projection 19 is formed as the corner 23. Alternatively, each edge may be formed as an arcuate curved surface. Good.

  Moreover, in the said Example, although the two protrusions 17 were provided in the board | substrate body 14, you may provide the protrusion 17 of a number other than this.

  As described above, when the cutting blade rotating body according to the present invention is used for mowing with a flexible wire blade, the flexible wire blade is difficult to come off, and for example, the flexible wire blade When exchanging the blade, the operator has an excellent effect of easily removing the mounted flexible linear blade, and is suitable for application to such a cutting blade rotating body. .

(A) is a partial sectional plan view showing a cutting blade rotator according to an embodiment of the present invention, (B) is a cross section of the cutting blade rotator according to the embodiment as viewed from the IB-IB direction of FIG. FIG. It is the fragmentary sectional view which looked at the cutting blade rotary body which concerns on the same embodiment from the II-II direction of FIG. 1 (A). It is the fragmentary sectional view which looked at the cutting blade rotary body which concerns on the same embodiment from the III-III direction of FIG. 1 (A). It is sectional drawing which looked at the cutting blade rotary body which concerns on the same embodiment from the IV-IV direction of FIG. 1 (A). It is a side view which shows the cutting blade rotary body which concerns on the same embodiment. It is a longitudinal cross-sectional view which shows the cutting blade rotary body which concerns on other embodiment of this invention. It is a fragmentary top view which shows the other usage example of the cutting blade rotary body which concerns on the same embodiment shown to FIG. 1 (A). It is a partial top view which shows the conventional cutting blade rotary body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Cutting blade rotary body 12 Brush cutter 12a Rotating shaft 13, 38 Flexible wire blade 14 Panel main body 14a Top surface 15 of board main body Boss part 16 Outer peripheral wall 17 Protrusion 18 Insertion hole 19 Bending protrusion 20 Inclined surface 21 Boss portion side opening portion 22 Side surface 23 of projection on boss portion side Corner portion 25, 26 Guide surface 27 End portion side portion 30 of flexible linear blade Outside opening portion 31 of insertion hole Folded portion 32, 33 Bent portion 35 Steep slope 36 Slowly inclined surface 37 Retaining part

Claims (4)

In a cutting blade rotating body used by attaching a flexible linear blade and attaching to a brush cutter,
A pair of board main bodies rotated by the brush cutter, a protrusion provided on the surface of the board main body, a pair of protrusions provided on the protrusion through which the flexible linear blade penetrates from the center of rotation to the outside. Provided between the insertion hole and the rotation center side opening of the paired insertion hole, the folded portion of the flexible linear blade exposed from each rotation center side opening is formed from the surface of the panel main body. A bending projection that bends in the direction of separation ,
The cutting blade rotating body according to claim 1, wherein the bending protrusion has a width that decreases from the center of rotation toward the outside. In the cutting blade rotating body used by attaching a flexible linear blade and attaching to a brush cutter,
A pair of board main bodies rotated by the brush cutter, a protrusion provided on the surface of the board main body, a pair of protrusions provided on the protrusion through which the flexible linear blade penetrates from the center of rotation to the outside. Provided between the insertion hole and the rotation center side opening of the paired insertion hole, the folded portion of the flexible linear blade exposed from each rotation center side opening is formed from the surface of the panel main body. A bending projection that bends in the direction of separation,
The cutting blade rotating body characterized in that the bending protrusion is formed with an edge in the width direction of its upper surface as a corner. In the cutting blade rotating body used by attaching a flexible linear blade and attaching to a brush cutter,
A pair of board main bodies rotated by the brush cutter, a protrusion provided on the surface of the board main body, a pair of protrusions provided on the protrusion through which the flexible linear blade penetrates from the center of rotation to the outside. Provided between the insertion hole and the rotation center side opening of the paired insertion hole, the folded portion of the flexible linear blade exposed from each rotation center side opening is formed from the surface of the panel main body. A bending projection that bends in the direction of separation,
A cutting blade rotating body, wherein the bending protrusion is formed as a reinforcing portion of the panel body. 4. The inclined surface according to claim 1, wherein the bending protrusion is formed with an inclined surface that is inclined in a direction away from the surface of the panel main body toward the center of rotation of the panel main body. Cutting blade rotating body.

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