JP2011244799A - Rotary blade for bush-cutting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary blade for a bush-cutting machine which can prevent plants from winding around the distal end of the bush-cutting machine, reduce burdens on a worker and efficiently perform the bush-cutting operation.SOLUTION: A cutting edge is formed in the outer peripheral edge of a disk-shaped metal base, and an attaching surface with an attaching hole which can be attached to an attaching flange of the bush-cutting machine is formed at the central region of the metal base in the rotary blade for the bush-cutting machine. The rotary blade for the bush-cutting machine is characterized by a winding preventive cup which is integrally fixed by a fixing means to the outer peripheral side of the attaching hole on the attaching surface in such a state as to project toward the bush-cutting machine side. The winding preventive cup includes a sidewall which is circular as seen from the top, and a bottom wall having an opening whose inner diameter is larger than the outer diameter of the attaching flange at the center. The height of the sidewall is set not to be brought into contact with a rotation transmitting shaft of the bush-cutting machine, and a discharge hole and a lightweight hole to discharge water or scraps within the cup to outside by centrifugal force are formed on the bottom wall side of the sidewall.

Description

  The present invention relates to a rotary blade for brush cutting that is attached to a brush cutter and used when cutting grass, vines, trees or the like (referred to as grass).

  Conventionally, as shown in FIG. 8, for example, a rotary blade for brush cutting such as a tip saw is known. The rotary blade 101 has a mounting hole 103 for the brush cutter 104 formed in a flat mounting surface 102a at the center of the disk-shaped base metal 102, and swelled downward around the outer surface of the mounting surface 102a. An annular bulging portion 102b is formed. Further, the edge surface 102c is formed outside the bulging portion 102b of the base metal 102 in a state of warping in the direction of the mounting surface 102a.

  A tip having a scooping surface and a tip surface is brazed to the tip fixing portion at the tip of the cutting edge portion 102 c of the base metal 102, and the rotary blade 101 is cut by the attachment bolt 105 using the attachment hole 103. It is attached to the saw receiving flange 104a of the dispenser 104. In addition, as this kind of rotary blade, it is disclosed by patent document 1, for example.

Japanese Utility Model Publication No. 06-24429

  However, in such a rotary blade 101, there is a case where the vegetation or the like cut by the cutting edge (chip) is wound around the saw receiving flange 104a portion of the brush cutter 104 and the rotational speed of the brush cutter 104 is lowered. In order to prevent such wrapping, the operator works in advance in a state where the rotational speed of the brush cutter 104 is increased more than necessary. Also, if a vine has been wound, remove the vine that has been wound by increasing the rotation speed of the brush cutter 104 or if it cannot be removed even if the rotation speed is increased, interrupt the brush cutting work. Since it is removed by hand, the burden on the operator is likely to increase during the mowing operation, and it is difficult to efficiently perform the mowing operation.

  The present invention has been made in view of such circumstances, and its purpose is to prevent winding of the bush or the like on the tip of the brush cutter, to reduce the burden on the operator, and to efficiently perform the brush cutting work. Another object of the present invention is to provide a rotary blade for brush cutting that can be performed and easily mounted on various brush cutters and has excellent versatility.

  In order to achieve this object, the invention according to claim 1 of the present invention is such that a cutting edge is formed on the outer peripheral edge of a disk-shaped base metal, and a mounting flange of a brush cutter is provided at the central part of the base metal. A rotary blade for brush cutting in which a mounting surface having a mounting hole that can be mounted on the outer surface of the mounting surface is formed on the outer peripheral side of the mounting hole of the mounting surface, and the outer diameter of the mounting flange at a substantially circular side wall in the plan view An anti-winding cup provided with a bottom wall having an opening having a larger inner diameter is fixed integrally with the fixing means so as to protrude toward the brush cutter.

  According to the second aspect of the present invention, the height dimension of the side wall is set to a dimension that does not contact the rotation transmission shaft of the brush cutter, and the water in the winding prevention cup is cut off on the bottom wall side of the side wall. It is characterized in that a discharge hole capable of discharging wastes and the like by centrifugal force is formed. Furthermore, the invention described in claim 3 is characterized in that a lightweight hole is formed in the side wall, and a round-shaped return portion is formed at an upper end edge thereof. According to a fourth aspect of the present invention, the mounting surface is formed so as to have a step with the cutting edge surface, so that a recess is formed on the back surface side of the mounting surface, and the fixing means is located in the recess. It is characterized by. Further, in the invention according to claim 5, the mounting surface is formed in a flat shape with the cutting edge surface, and protrudes inward from the mounting surface and the bottom wall of the anti-winding cup and can be fitted to each other. Recesses are respectively formed, and the fixing means is located in the recesses.

  According to the invention described in claim 1 of the present invention, the wrapping prevention cup provided with the side wall and the bottom wall having the opening is integrally formed by the fixing means on the outer peripheral side of the mounting hole of the mounting surface of the base metal. Because it is firmly attached to the winder, it is possible to prevent wrapping around the tip of a brush cutter such as vegetation that has been brushed off with a wrapping prevention cup. It can be carried out. In addition, since the anti-winding cup is integrally fixed to the base metal in advance, the rotary blade can be attached to various brush cutters as in the conventional case, and the versatility can be improved.

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, the height of the side wall is set to a size that does not contact the rotation transmission shaft of the brush cutter, and the bottom of the side wall Since the discharge hole is formed on the wall side, the rotary blade with the anti-winding cup can be attached to the brush cutter without adversely affecting its rotation, and water and chips in the cup can be removed from the rotary blade. Smooth rotation of the rotary blade can be obtained, for example, it can be discharged from the discharge hole by centrifugal force during rotation.

  Further, according to the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, a lightweight hole is formed in the side wall, and a round-shaped return portion is formed in the upper edge thereof. Therefore, it is possible to improve the efficiency of the brushing work by reducing the weight of the anti-winding cup by the lightweight hole, and it is possible to increase the rigidity of the anti-winding cup by the return part, and the cup of the While preventing a deformation | transformation etc., the safety | security of a winding prevention cup can be improved.

  According to the invention described in claim 4, in addition to the effects of the invention described in claims 1 to 3, a recess is formed on the back surface side (anti-brusher side) of the mounting surface by the step, and the inside of the recess Since the fixing means is located on the mounting surface, the fixing means such as rivets and spot welding can be positioned in the recesses, and the wearing means is prevented from being worn or deformed. It can be integrated (fixed) in a stable state.

  According to the invention described in claim 5, in addition to the effects of the invention described in claims 1 to 3, recesses projecting inward of the cup are formed on the mounting surface and the bottom wall of the anti-winding cup, respectively. In addition, since the fixing means is located in the recess, even if it is a flat base metal, the fixing means such as a rivet or spot welding can be positioned in the recess to prevent the fixing means from being worn or deformed. Thus, the winding prevention cup can be integrated (fixed) to the mounting surface in a stable state over a long period of time.

  The top view which shows one Embodiment of the rotary blade for brushing concerning this invention   Arrow view along the AA line   Enlarged view of the side wall of the wrapping prevention cup   Arrow view along the BB line   The figure which shows the attachment state to the same brush cutter   The figure which shows the attachment state to the brush cutter of other embodiment of the rotary blade for brush cutting concerning this invention.   The figure which shows the modification of the winding prevention cup of the rotary blade for brushing concerning this invention   The figure which shows the attachment state to the brush cutter of the conventional rotary blade for brush cutting

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
1 to 5 show an embodiment of a rotary blade for brush cutting according to the present invention. As shown in FIGS. 1 and 2, a rotary blade 1 for cutting (referred to as a rotary blade 1) has a base 2 having a disk shape and a large number of lightweight holes 3a and 3b. A mounting hole 4 for a brush cutter 5 described later is formed at the center position.

  Further, the base metal 2 is formed with a flat mounting surface 2a having a predetermined width outside the mounting hole 4, and a stepped portion 2b protruding from the mounting surface 2a toward the anti-brusher 5 side with a height dimension h1. Is formed, and a flat cutting edge surface 2c is formed outside the stepped portion 2b. A large number of chip fixing portions 11 and blade chambers 10 are formed at regular intervals on the outer peripheral edge of the base metal 2 which is the tip of the cutting edge surface 2c. Each chip fixing portion 11 has a chip made of a cemented carbide as a cutting edge. Each of 7 is marked with a row. The chip 7 has a scooping surface, a tip surface, and a plurality of fixing surfaces, and each fixing surface is brazed to the chip fixing portion 11 of the base metal 2.

  Further, the base metal 2 is formed with a space-like concave portion 6 having a circular shape when viewed from the back side by the stepped portion 2b, and the mounting surface 2a and the blade edge surface 2c are formed in parallel, whereby the chip 7 is set so that the directivity direction (projecting direction outward) and the mounting surface 2a are parallel (a plane in the same direction).

  A winding prevention cup 12 is integrally fixed to the mounting surface 2 a of the base metal 2. The winding prevention cup 12 is formed into a substantially cup shape having a diameter φ1 substantially equal to the outer diameter of the mounting surface 2a by bending a steel plate or aluminum plate having a thickness of about 1.2 mm or molding various resins. It has a vertical vertical side wall 12a having a predetermined height dimension h2 and a bottom wall 12b connected to the lower end of the side wall 12a. A circular opening 12c is formed at the center position of the bottom wall 12b of the winding prevention cup. The opening 12c is set to have an inner diameter that is substantially equal to or larger than an outer diameter of a saw receiving flange 5a that is a mounting flange of the brush cutter 5 described later, as shown in FIG.

  Further, as shown in FIGS. 3 and 4, a plurality of circular lightweight holes 14 are formed in a zigzag pattern, for example, in a zigzag manner in the circumferential direction at the lower end of the side wall 12a. A plurality of discharge holes 15 are formed at predetermined intervals in the circumferential direction in contact with the bottom wall 12b. Note that the size (diameter) of the lightweight hole 14 and the discharge hole 15 is a predetermined size that does not wind around the wrapping prevention cup 12 due to the entry of trimmed vegetation or the like. For example, the inner diameter is set to 6 mm so that chips, dirt, and the like can be discharged to the outside by centrifugal force.

  Further, the upper end of the side wall 12a of the winding prevention cup 12 is integrally formed with a return portion 16 whose outer peripheral surface is formed into a round shape by bending the side wall 12a inward. The size of the wrapping prevention cup 12 is set such that its outer diameter (diameter φ) is, for example, about 134 mm and the height dimension h2 is, for example, about 27 mm. The larger one is preferable according to the form of the brush cutter 5 and the like.

  As shown in FIGS. 1 and 2, the wrapping prevention cup 12 is integrated with a rivet 13 as a fixing means by using a rivet hole formed in the bottom wall 12b and the mounting surface 2a of the base metal 2. Fixed. At this time, for example, 6 to 8 rivets 13 (eight in FIG. 1) are provided at regular intervals in the circumferential direction, and the base of the rivet 13 is in a state where the anti-winding cup 12 is fixed to the base 2. As shown in FIG. 2, the head on the metal 2 side is located in the recess 6 of the base 2 so that the head of the rivet 13 does not protrude to the back side of the base 2. The wrapping prevention cup 12 prevents wrapping of the vegetation or the like that has been brushed off by the tip 7 as will be described later on the tip of the brush cutter 5.

  As shown in FIG. 5, the rotary blade 1 configured in this way includes a saw retaining cover 5 c, a saw retainer flange 5 d, and a saw receiving flange 5 b as a mounting flange at the tip of the rotation transmission shaft 5 a of the brush cutter 5. It is attached via a mounting bolt 9. At the time of mounting, the mounting bolt 9 is positioned in the recess 6 of the rotary blade 1 by bringing the mounting surface 2a of the rotary blade 1 into contact with the surface of the saw receiving flange 5b of the brush cutter 5, Due to the height dimension h1 of the stepped portion 2b, the head of the mounting bolt 9 is positioned in the recess 6 so as not to protrude outward (downward in FIG. 5).

  Further, in the mounted state, the bottom wall 12b of the anti-winding cup 12 has the saw receiving flange 5b of the brush cutter 5 positioned in the opening 12c by the above-described size setting of the opening 12c of the bottom wall 12b. The wall 12b and the saw receiving flange 5b do not interfere with each other, and the rotary blade 1 is attached to the brush cutter 5 without any adverse effects. Further, by setting the height dimension h2 of the side wall 12a of the winding prevention cup 12 to a predetermined value according to, for example, the shape of the brush cutter 5 to be used, the upper end of the side wall 12a and the rotation transmission shaft of the brush cutter 5 are used. A predetermined gap dimension h3 (for example, 5 to 15 mm) is secured between the outer peripheral surfaces of 5a. The width of the mounting surface 2a of the rotary blade 1 is set larger than the outer diameter of the saw receiving flange 5b of the brush cutter 5, and the mounting surface 2a is in close contact with the entire flange surface of the saw receiving flange 5b. It is in a state.

  When the brush cutter 5 is operated while the rotary blade 1 is attached to the brush cutter 5, the rotary blade 1 rotates at a predetermined rotational speed, and the tip 7 at the tip of the blade edge surface 2c is substantially perpendicular to the plant or the like. In this state, the vegetation and the like are cut smoothly. At the same time, the cut vegetation and the like are brought into contact with the outer peripheral surface of the side wall 12a of the anti-winding cup 12 and bounced back. Is prevented from being wound around the saw receiving flange 5b, which is the tip of the brush cutter 5. Further, swarf and dust of vegetation stored in the wrapping prevention cup 12 or water such as water drops or rain of the vegetation is discharged from the cup 12 through the discharge hole 15 provided in the cup 12 as shown by an arrow A in FIG. At that time, chips and the like in the cup 12 are reliably discharged to the outside from the discharge hole 15 having a predetermined inner diameter by the centrifugal force generated by the rotation of the rotary blade 1.

  That is, the anti-winding cup 12 is integrally fixed to the attachment surface 2a of the base metal 2 with the rivet 13 in a state of protruding to the brush cutter 5 side, so that the brush cutter 5 is attached to the side wall 12a of the cup 12. Can be covered with a predetermined distance L (see FIG. 5) to prevent contact between the saw receiving flange 5b of the plant and the like cut by the chip 7 and so on. Can be prevented from being wound around the mower 5 or the like.

  As described above, according to the rotary blade 1, the anti-winding cup 12 including the side wall 12 a and the bottom wall 12 b having the opening 12 c in the central portion on the outer peripheral side of the mounting hole 4 of the mounting surface 2 a of the base metal 2. However, since they are integrally fixed by a plurality of rivets 13, it is possible to prevent wrapping of the bush or the like such as vegetation that has been brushed off by the winding prevention cup 12, and during cutting work The burden on the worker can be reduced and the mowing work can be performed efficiently. Further, since the anti-winding cup 12 is integrally fixed to the base metal 2 in advance and the rotary blade 1 is formed, the rotary blade 1 is attached to the various types of brush cutters 5 by the same operations (procedures) as before. The versatility of the rotary blade 1 can be improved such that it can be mounted or replaced.

  Moreover, since the height dimension h2 of the side wall 12a of the winding prevention cup 12 is set to a dimension that does not contact the rotation transmission shaft 5a of the brush cutter 5, the rotary blade 1 provided with the winding prevention cup 12 is cut. Since it can be attached to the dispenser 5 without adversely affecting its rotation, and the discharge hole 15 is formed on the bottom wall 12b side of the side wall 12a of the anti-winding cup 12, chips, water, etc. in the cup 12 are formed. Can be discharged to the outside from the discharge hole 15 by centrifugal force, and the rotating blade 1 can be easily rotated smoothly. It can be carried out.

  Furthermore, since the lightweight hole 14 is formed in the side wall 12a of the winding prevention cup 12, the cup 12 itself can be reduced in weight, and the weight increase of the rotary blade 1 can be suppressed as much as possible to improve the workability of the brushing work. Can be made. Moreover, since the round-shaped return part 16 is formed in the upper end edge of the side wall 12a of the winding prevention cup 12, the rigidity of the side wall 12a is improved by the return part 16, for example, when the brush cutter 5 is moved. It is possible to prevent deformation or the like of the wrapping prevention cup 12 and improve safety when the operator touches the wrapping prevention cup 12.

  In addition, a recess 6 is formed by a stepped portion 2b on the back side of the mounting surface 2a of the base metal 2 which is the anti-brusher 5 side, and the rivet 13 is located in the concave part 6, so The head on the second side can be reliably positioned in the recess 6, the head of the rivet 13 is prevented from being worn or deformed, and the anti-winding cup 12 is kept stable on the mounting surface 2 a for a long time. It can be integrated (fixed), and a safe mowing operation can be performed.

  In the case of the rotary blade 1, the following incidental effects can be obtained. That is, the base metal 2 includes an attachment surface 2a, a stepped portion 2b, and a blade edge surface 2c. When the attachment surface 2a is attached to the brush cutter 5 with the attachment bolt 9, the head of the attachment bolt 9 has a circular recess 6. Since the mounting bolt 9 is protected by the recess 6, the head can be prevented from being worn or deformed, and the mounting bolt 9 can be improved when the rotary blade 1 is attached to or removed from the brush cutter 5. The rotating operation can be performed and the rotating blade 1 can be exchanged smoothly.

  Further, since the cutting edge surface 2c that affects the cutting performance is formed in parallel with the mounting surface 2a, the tip 7 as the cutting edge and the mounting surface 2a (the mounting surface to the brush cutter 5) have an angle, and the tip 7 is It is possible to prevent oblique entry into the plant and the like, the chip 7 can be inserted into the plant and the like at a substantially right angle, and a good sharpness can be easily obtained in the rotary blade 1.

  By the way, in the said embodiment, although the attachment surface 2a and the blade edge | tip surface 2c of the base 2 were formed so that it might have a predetermined level | step difference by the level | step-difference part 2b, this invention is not limited to this structure, For example, FIG. As shown, the stepped portion 2b can be eliminated and the mounting surface 2a and the blade edge surface 2c can be applied to a base metal 2 having a flat plate shape. That is, the rotary blade 1 has a flat base metal 2 having an attachment surface 2a in which an attachment hole 4 is formed and a blade edge surface 2c in which a chip 7 is fixed to the outer periphery, and a lightweight hole 14 in the attachment surface 2a. And a winding prevention cup 12 having a discharge hole 15 and the like are integrally fixed by a rivet 13.

  At this time, the mounting surface 2a of the base metal 2 is formed with a recess 18 projecting toward the brush cutter 5, and the bottom wall 12b of the anti-winding cup 12 is formed with a recess 19 projecting inward of the cup 12. Has been. When the concave portions 18 and 19 are overlapped, the concave portion 18 is fitted into the concave portion 19, and the wrapping prevention cup 12 and the base metal 2 are integrated by the rivet 13 in the concave portions 18 and 19. Fixed. The recesses 18 and 19 may have an annular shape that is concentric with the mounting hole 4 or may be a plurality of recesses that are concentrically circular and have a circular shape in plan view. The recesses 18 and 19 are set so that the head of the rivet 13 on the base metal 2 side is located in the concave part 19 of the base metal 2 and does not protrude to the back side of the base metal 2.

  The rotary blade 1 is attached to the saw receiving flange 5b of the brush cutter 5 by a mounting bolt 9 via a bolt protective cover 17, and the concave portions 18 and 19 are positioned on the outer periphery of the bolt protective cover 17. ing. Also in the rotary blade 1 of this embodiment, the same effect as that of the above-described embodiment can be obtained, for example, the winding prevention cup 12 can prevent winding of the chopped plant or the like around the tip of the brush cutter 5. it can.

  Further, the head of the rivet 13 can be positioned in the concave portion 19 of the base metal 2, and the head of the rivet 13 is prevented from being worn or deformed. It is possible to achieve an effect such as being able to be integrated with the mounting surface 2a in a stable state over a long period of time. In addition, the recesses 18 and 19 that can be fitted to each other can surely position the base metal 2 and the anti-winding cup 12 and can increase the fixing strength. In the case of this embodiment, as shown by a two-dot chain line in FIG. 6, the outer diameter of the bolt protection cover 17 is increased so as to cover the rivet 13, and the concave portion 18 of the base metal 2 and the winding prevention cup 12. , 19 can be omitted, and the base metal 2 can be formed into a substantially complete flat plate shape.

  In each of the embodiments described above, the anti-winding cup 12 has the vertical side wall 12a having the height dimension h2. However, for example, as shown in FIG. 7A, the side wall 12a is connected to the inclined surface 12a2. For example, it is formed by the vertical surface 12a1, the side wall 12a is formed as an inclined surface as shown in FIG. 7 (b), or the side wall 12a is formed as a curved surface as shown in FIG. 7 (c). An appropriate shape that can cover the entire area of the front end of the machine 5 with a predetermined distance L can be adopted.

  In each of the above embodiments, the rivet 13 is used as the fixing means. However, for example, welding such as spot welding is used, the wrapping prevention cup 12 is formed integrally with the base metal 2, or the base metal 2 and Appropriate means for obtaining a surely fixed state, such as detachably fixing the winding prevention cup 12 with a bolt, can be employed. Further, the number and shape of the chips 7, the width of the mounting surface 2a of the base metal 2, the height h1 of the stepped portion 2b, the size and position of the lightweight holes 3a, 3b, 14 and the discharge hole 15 in each of the above embodiments. This is also an example, and an appropriate configuration can be adopted without departing from the scope of the present invention.

  The present invention is not limited to a rotary blade (tip saw) in which a chip is fixed to the outer peripheral edge of a disk-shaped base metal, and is used for cutting off vegetation such as a rotary blade whose blade edge is integrally formed with the base metal. Available for all rotating blades.

  DESCRIPTION OF SYMBOLS 1 ... Rotary blade, 2 ... Base metal, 2a ... Mounting surface, 2b ... Step part, 2c ... Cutting edge surface, 4 ... Mounting hole, 5 ... Brush cutter, 5a: Rotation transmission shaft, 5b: Saw receiving flange, 5d: Saw retainer flange, 6 ... Recess, 7 ... Tip, 9 ... Mounting bolt, 12 ... Winding prevention Cup, 12a ... side wall, 12b ... bottom wall, 12c ... opening, 13 ... rivet, 14 ... lightweight hole, 15 ... discharge hole, 16 ... return part, 17. ..Bolt protection cover, 18, 19...

Claims (5)

A rotary blade for brush cutting in which a cutting edge is formed on the outer peripheral edge of the disk-shaped base metal, and a mounting surface having a mounting hole that can be attached to the mounting flange of the brush cutter is formed in the central part of the base metal. There,
An anti-wrapping cup provided with a side wall having a predetermined height which is substantially circular in plan view on the outer peripheral side of the mounting hole of the mounting surface, and a bottom wall having an opening having an inner diameter larger than the outer diameter of the mounting flange at the center portion. A rotary blade for brush cutting, which is fixed integrally with the fixing means in a state of protruding toward the brush cutter.   The height of the side wall is set to a size that does not come into contact with the rotation transmission shaft of the brush cutter, and the inside of the anti-winding cup and water and chips can be discharged to the outside by centrifugal force on the bottom wall side of the side wall. 2. A rotary blade for brush cutting according to claim 1, wherein a discharge hole is formed in the blade.   The rotary blade for brush cutting according to claim 1 or 2, wherein a lightweight hole is formed in the side wall, and a round-shaped return portion is formed at an upper end edge thereof.   4. The mounting surface according to any one of claims 1 to 3, wherein the mounting surface is formed to have a step with the blade edge surface, thereby forming a recess on the back side of the mounting surface, and the fixing means is located in the recess. The rotary blade for mowing according to crab.   The mounting surface is formed in a flat plate shape with the cutting edge surface, and a recess that protrudes inwardly of the cup and can be fitted to each other is formed on the mounting surface and the bottom wall of the wrapping prevention cup, and the recess is formed in the recess. The rotary blade for brush cutting according to any one of claims 1 to 3, wherein a fixing means is located.

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