JP2007274937A - Brush cutter, linear blade rotary unit and tabular rotary blade - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brush cutter which simultaneously cuts soft grass and small sized trees and is suitable for cutting grass from roots, a linear blade rotary unit and a tabular rotary blade used for the brush cutter. <P>SOLUTION: The brush cutter 1 is equipped with an operation rod 2 having a drive shaft 6 at the tip, the linear blade rotary unit 5 connected to the drive shaft 6 below the tip, the tabular rotary blade 4 installed between the operation rod 2 and the linear blade rotary unit 5 and having a blade 4a on the periphery, and a regulation unit 22 for regulating a position of the tabular rotary blade 4 to the linear blade rotary unit by engaging with the tabular rotary blade 4 on the upper surface of the linear blade rotary unit 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a brush cutter for carrying an operator to cut grass, a linear blade rotating unit and a plate-shaped rotating blade used in the brush cutter, and more specifically, extending outward. The present invention relates to a brush cutter or the like that can cut grass using a linear blade rotating unit having a flexible linear blade and a metal disk-like blade that is generally provided with a blade on the periphery.

  Conventionally, as a brush cutter used for cutting grass, a metal plate-like rotary blade such as a tip saw, a circular saw blade, a cutting blade, etc., attached to the main body of a brush cutter such as an operation rod has been widely used. Yes. In the case of the one provided with such a plate-like rotary blade, the plate-like rotary blade is rotated at high speed by an engine or a motor provided in the main body, and this plate-like rotary blade is applied to grass to be used for cutting.

  Further, as other brush cutters, those in which a linear blade rotating unit in which a flexible linear blade such as a nylon cord protrudes outward is attached to a brush cutter body are widely used. In the case of the brush cutter provided with the linear blade rotating unit, when the linear blade rotating unit is rotated at a high speed by an engine or a motor, the flexible linear blade radially protrudes from the rotating shaft due to the centrifugal force generated at that time. Turn in state. And grass is cut | disconnected by the protrusion part of the flexible linear blade which turns.

  Of the above-mentioned brush cutters, those equipped with a plate-like rotary blade can cut small-diameter trees in addition to grass, but when cutting grass or small-diameter trees near the root, the cutting edge is on the ground. It would not be suitable for cutting grasses and small-diameter trees near the roots because they would come in contact with each other and would spread sand around and shorten the life of the plate-like rotary blade.

  On the other hand, in the case of a brush cutter equipped with a linear blade rotating unit, there is an advantage that even if a flexible linear blade comes into contact with the ground, the sand is less scattered, and there is little effect on its life. Cannot cut hard grass. From the above, it was necessary to properly use a brush cutter provided with a plate-like rotary blade and a brush cutter provided with a linear blade rotating unit depending on the purpose.

Furthermore, in addition to the above-described one, a brush cutter having a specially configured rotating body as shown in FIG. 13 is provided (see Patent Document 1). The rotating body 101 is configured such that the center portion is aligned between the upper and lower disks 102, 102 that are opposed to each other, and the cylindrical portion 103 is sandwiched between the upper and lower disks 102, 102. Three pins 104 are installed at equal intervals along the circumferential direction. A nylon cord 105 folded in half is wound around the cylindrical portion 103 of the rotating body 101, and both ends of the nylon cord 105 extend outward through the pins 104. Each pin 104 is individually supported by a saw-shaped cutting blade 106. In the case of this brush cutter, since the nylon cord 105 and the cutting blade 106 are turned together by rotating the rotary body A1, soft grass, a small diameter tree, and the like can be cut at a time.
Japanese Patent Laid-Open No. 11-235113

  However, in the brush cutter disclosed in Patent Document 1, when the nylon cord 105 and the cutting blade 106 are both close to each other between the upper and lower disks 102, 102, the nylon cord 105 is used to cut grass from the root. Thus, it is difficult to avoid contact between the cutting blade 106 and the ground. In addition, during the weeding operation, the cutting blade 106 may be positioned below the nylon cord 105 between the upper and lower disks 102, 102. In this case, contact between the cutting blade 106 and the ground is avoided. Becomes increasingly difficult.

  Therefore, the present invention includes a linear blade rotating unit and a plate-shaped rotating blade, and can cut soft grass and small-diameter trees at the same time, and surround ground sand when cutting grass and the like from the root. It is an object of the present invention to provide a brush cutter that is less scattered and a linear blade rotating unit and a plate-like rotating blade used in the brush cutter. Furthermore, in such a brush cutter, it aims at providing the structure which can prevent the position shift of a linear blade rotation unit and a plate-shaped rotary blade.

  The present invention has been made in view of the above-described circumstances, and a brush cutter according to the present invention is connected to the rotation output unit below the main body having a rotation output unit, and extends outward. A linear blade rotation unit that cuts an object during rotation by a flexible linear blade provided, and is interposed between the main body and the linear blade rotation unit above the linear blade rotation unit, A plate-like rotary blade that cuts an object during rotation by a blade provided in the section is provided.

  With such a configuration, soft grass, a small-diameter tree, or the like can be simultaneously cut by the linear blade rotating unit and the plate-shaped rotating blade rotated by the rotation output unit. Moreover, since the plate-like rotary blade is located above the linear blade rotating unit, and the plate-like rotary blade cannot be located below the linear blade rotary unit during normal use, When cutting, the plate-like rotary blade is less likely to come into contact with the ground, and sand can be prevented from being scattered.

  Moreover, even if the upper surface of the said linear blade rotation unit is provided with the control part which controls the position of the said plate rotation blade with respect to the said linear blade rotation unit by engaging with the said plate rotation blade. Good.

  Such a configuration makes it difficult for positional deviation in the rotational direction to occur between the linear blade rotating unit and the plate-shaped rotating blade due to the restricting portion, and both of them rotate at a high speed integrally. It can be carried out.

  The restricting portion may protrude from the upper surface of the linear blade rotating unit, and the plate-like rotating blade may have a restricted hole into which the restricting portion is inserted. With such a configuration, the restricting portion can be realized with a simple configuration.

  Moreover, the said control part may be provided in the outer peripheral part vicinity in the upper surface of the said linear blade rotation unit. As described above, since the restricting portion is provided in the vicinity of the outer peripheral portion, that is, at a position relatively separated from the rotational axis of the linear rotating body, the rotational force of the linear blade rotating unit acts on the plate-shaped rotating blade with a large moment. Can be made. At the same time, it is possible to reliably prevent the positional deviation in the rotational direction between the linear blade rotating unit and the plate-shaped rotating blade.

  Moreover, the said control part may be opposingly arranged on both sides of the rotating shaft center of the said linear blade rotation unit. With such a configuration, the rotational moment of the linear blade rotating unit can be applied to the plate-shaped rotating blade so that there is no positional bias, and at the same time, the linear blade rotating unit, the plate-shaped rotating blade, Can be reliably prevented.

  The linear blade rotation unit may include a metal contact portion that contacts the rotation output portion of the main body, and the restriction portion may be integrally formed with the contact portion. With such a configuration, the strength of the restricting portion is improved, and transmission of the rotational moment to the plate-like rotary blade and prevention of displacement of the plate-like rotary blade can be reliably realized.

  The rotation output portion of the main body includes a drive bolt that extends downward and rotates about an axis. The contact portion of the linear blade rotation unit and the plate-like rotary blade include the drive bolt. The linear blade rotating unit and the plate-shaped rotating blade are threaded through the insertion holes, and nuts are screwed onto the drive bolts. It may be connected to the main body. By setting it as such a structure, a linear blade rotation unit and a plate-shaped rotary blade can be easily attached or detached by attachment or detachment of a nut.

  Further, the linear blade rotating unit according to the present invention is connected to the brush cutter body from below with a plate-shaped rotating blade interposed therebetween, and an object is rotated during rotation by a flexible linear blade extending outward. The upper surface is provided with a restricting portion for restricting the position of the plate-like rotary blade with respect to the linear blade-rotating unit by being engaged with the plate-like rotary blade.

  Further, the plate-like rotary blade according to the present invention is a linear blade that cuts an object during rotation by a brush cutter body and a flexible linear blade that is positioned below the brush cutter body and extends outward. An object interposed between the rotating unit and a blade provided on the periphery to cut an object during rotation, and a target portion protruding from the upper surface of the linear blade rotating unit. A restriction hole is provided.

  According to the present invention, it is possible to simultaneously cut soft grass, small-diameter trees, and the like, and a brush cutter that hardly scatters ground sand when cutting grass or the like from the root, and the brush cutter. A linear blade rotating unit and a plate-shaped rotating blade to be used can be realized. Furthermore, in such a brush cutter, it is possible to realize a configuration that can prevent the positional deviation between the linear blade rotating unit and the plate-shaped rotating blade.

  Hereinafter, a brush cutter according to an embodiment of the present invention, and a linear blade rotating unit and a plate-like rotating blade used in the brush cutter will be described with reference to the drawings.

  FIG. 1 is an assembly diagram of a portable brush cutter 1 according to the present embodiment, and a part thereof is shown in cross section around a blade periphery. As shown in FIG. 1, the brush cutter 1 has a plate-like rotary blade 4 such as a tip saw and a linear blade such as a so-called nylon cord cutter at the front end portion of an operating rod (brusher body) 2 that is gripped by an operator. The unit 5 is assembled in this order. In addition, the concept of the direction (especially up and down direction) used in the following description is to use the posture of the brush cutter 1 during the operation of cutting grass on the ground as being consistent with the reference, and if different, An explanation shall be attached.

  A power source such as an engine or a motor (not shown) is provided at the rear portion of the operation rod 2, and the power generated by the power source is transmitted through a transmission shaft in the operation rod 2 and a gear (not shown) in the tip portion. Then, it is transmitted to the drive shaft (rotation output part) 6 extending downward from the tip part. As a result, when the power source is driven, the drive shaft 6 rotates around the axis 7. A linear blade rotating unit 5 is attached to the drive shaft 6 with a plate-shaped rotating blade 4 interposed therebetween.

  FIG. 2 is an enlarged view of the linear blade rotation unit 5 shown in FIG. 1 and shows a detailed configuration, and shows a cross section when cut along a plane including the rotation axis. FIG. 3 is an exploded perspective view of the linear blade rotating unit 5 shown in FIG. 2 and 3, the linear blade rotating unit 5 includes a bobbin 11 for winding a cord blade 10 which is a flexible linear blade such as a nylon cord, a clutch 12 for rotating the bobbin 11 by a predetermined angle, The bobbin 11 and the clutch 12 are provided.

  The case 13 is composed of an upper case 14 and a lower case 15 made of synthetic resin, and the upper case 14 has a double cylinder shape including an outer cylinder 16 opened at the lower part and an inner cylinder 17 opened both vertically. A slide groove 17 a extending in the vertical direction is formed on the outer peripheral surface of the inner cylinder 17. The clutch 12 has a cylindrical shape with an open top, and a protrusion 12a (see FIG. 2) that extends in the vertical direction to engage with a slide groove 17a of the inner cylinder 17 of the upper case 14 on its inner peripheral surface. ) Is formed. Then, the clutch 12 is externally fitted and assembled to the inner cylinder 17 of the upper case 14 so that the slide groove 17a and the protrusion 12a are engaged. In this state, the clutch 12 and the upper case 14 are configured so as not to be displaced relative to each other around the axis.

  Further, when the clutch 12 is externally fitted to the inner cylinder 17 of the upper case 14, a coil spring 18 is disposed inside the inner cylinder 17. A metal mounting seat (contact portion) 19 having a shaft through hole 19a is provided in the upper opening portion of the inner cylinder 17 so as to pass the drive shaft 6 (see FIG. 1) extending from the tip of the operation rod 2. ing. The coil spring 18 is provided between the inner bottom surface of the clutch 12 and the lower surface of the mounting seat 19 in a state where the clutch 12 is externally fitted to the inner cylinder 17 and urges the clutch 12 downward.

  The bobbin 11 has a cylindrical reel shape, and a cord blade 10 is wound around an outer peripheral portion thereof. On the inner peripheral surface of the bobbin 11, a locked claw 11 a that engages with a locking claw 12 b protruding from the outer peripheral surface of the clutch 12 is provided. The locking claw 12b and the locked claw 11a constitute a clutch mechanism that restricts rotational displacement around the axis of the bobbin 11 relative to the clutch 12 (or the case 13), as will be described later. Such a bobbin 11 is externally fitted to the clutch 12 in a state where it is assembled to the upper case 14 and is assembled from below, and an annular space 14a (formed between the clutch 12 and the outer cylinder 16 of the upper case 14). The bobbin 11 is disposed on the apparatus (see FIG. 3).

  When the bobbin 11 is disposed in the space 14a, the cord blade 10 wound around the bobbin 11 is passed through the two cord through holes 20 formed in the outer cylinder 16 of the upper case 14, and has a predetermined dimension outward. Only extended. In this state, the lower case 15 is put on the lower opening of the upper case 14 from below, and the bobbin 11 is accommodated in the case 13. The lower case 15 has a substantially disk shape in plan view, and an opening 15a is formed at the center thereof. When the lower case 15 is connected to the upper case 14 as described above, the lower portion of the clutch 12 is lowered. It protrudes downward through the opening 15a of the case 15 (see FIG. 2).

  The linear blade rotating unit 5 according to the present embodiment is a semi-automatic nylon cord cutter capable of adjusting the length of the cord blade 10 semi-automatically, and is lightly applied to the ground while being attached to the tip of the operation rod 2. When struck, the clutch 12 protruding from the lower case 15 moves upward relative to the case 13 against the urging force of the coil spring 18. Then, the engaging claw 12b protruding from the outer peripheral surface of the clutch 12 and the engaged claw 11a protruding from the inner peripheral surface of the bobbin 11 are engaged, and the bobbin 11 rotates by a predetermined angle in a predetermined direction. To be fixed. Since such a clutch mechanism is described in detail in Japanese Patent Application No. 2005-155836 by the present applicant, a detailed description thereof is omitted here.

  FIG. 4 is a plan view of the linear blade rotating unit 5. As shown in FIGS. 2 and 4, a circular recess 19b is formed on the upper surface of the mounting seat 19 provided in the upper case 14 of the linear blade rotating unit 5 in a plan view. The already described shaft through hole 19a is formed. The concave portion 19b is adapted to be fitted with an annular blade receiving bracket 21 that is externally fitted to the drive shaft 6 at the tip of the operating rod 2 during assembly.

  Further, from the upper surface of the mounting seat 19, a restricting portion 22 that is fitted into a later-described restricted hole 26 provided in the plate-like rotary blade 4 is projected. The restricting portion 22 is made of metal having a circular shape in plan view, and is formed integrally with the metal mounting seat 19. In addition, two sets of the restricting portions 22 are provided so that two predetermined portions face each other with the shaft through hole 19a of the mounting seat 19 interposed therebetween, and 4 sets are provided at intervals of 90 degrees on the same circumference around the shaft through hole 19a. One is provided. Moreover, these restricting portions 22 are provided in the vicinity of the outer peripheral portion on the upper surface of the upper case 14 when the linear blade rotating unit 5 is viewed in plan.

  On the other hand, as shown in the plan view of FIG. 5, the plate-like rotary blade 4 has a disk shape, and a plurality of blades 4 a are arranged in the outer peripheral edge portion. In addition, a circular opening 25 is formed in a central portion in a plan view through which the drive shaft 6 and the blade bracket 21 of the operation rod 2 are inserted, and the opening 25 is a recess formed on the upper surface of the mounting seat 19. It is consistent with the planar shape of 19b. Further, the plate-shaped rotary blade 4 is formed with a plurality of regulated holes 26 that are fitted into the regulating portions 22 provided on the upper surface of the case 13 of the linear blade rotating unit 5. The restricted hole 26 has a circular shape having substantially the same diameter as the restricting portion 22 in a plan view, and when the plate-like rotary blade 4 is disposed on the upper side of the linear blade rotating unit 5, the linear blade rotates. It is provided at a position corresponding to the restricting portion 22 of the unit 5. More specifically, two sets of the regulated holes 26 are provided such that two predetermined holes face each other across the opening 25, and four are provided at intervals of 90 degrees on the same circumference around the opening 25. Yes.

  FIG. 6 is an assembly diagram for explaining a connection procedure of the operation rod 2, the plate-like rotary blade 4 and the linear blade rotary unit 5 having the above-described configuration, and the linear blade rotary unit 5 is shown in cross section. It is. FIG. 7 is a side view showing a connection form of the operating rod 2, the plate-like rotary blade 4, and the linear blade rotary unit 5. FIG. 8 is a plan view showing a connection form between the plate-like rotary blade 4 and the linear blade rotary unit 5, the operation rod 2 is omitted, and the plate-like rotary blade 4 is indicated by a two-dot chain line. Hereinafter, the connection procedure and connection form of the operation rod 2, the plate-like rotary blade 4, and the linear blade rotary unit 5 will be described.

  As shown in FIGS. 6 to 8, the plate-like rotary blade 4 is configured such that the restriction portion 22 of the upper case 14 constituting the linear blade rotation unit 5 is fitted into the restricted hole 26 of the plate-like rotary blade 4. The linear blade rotating unit 5 is mounted on the upper surface. At this time, the axis of the opening 25 formed at the center of the plate-like rotary blade 4 and the axis of the concave portion 19b having a circular shape in plan view formed on the upper surface of the mounting seat 19 of the linear blade rotary unit 5 coincide. It is like that.

  An annular blade receiving bracket 21 is externally fitted to the drive shaft 6 provided at the tip of the operation rod 2. Then, the blade bracket 21 is passed through the opening 25 of the plate-like rotary blade 4 and further fitted into the recess 19 b of the mounting seat 19 of the upper case 14. Thus, the drive shaft 6 is inserted from above into a shaft through hole 19 a provided in the center of the mounting seat 19. A thread is engraved on the lower portion of the drive shaft 6, and a nut 28 is screwed onto the lower portion of the drive shaft 6 protruding from the lower surface of the mounting seat 19 into the inner cylinder 17 of the upper case 14. Thereafter, as already described with reference to FIG. 3, the clutch 12, the bobbin 11, and the lower case 15 are sequentially assembled to the upper case 14, and the linear blade rotating unit 5 sandwiches the plate-shaped rotating blade 4. It is connected to the operation rod 2 in the interposed state. That is, the brush cutter 1 is assembled such that the plate-like rotary blade 4 is positioned above the linear blade rotary unit 5.

  The brush cutter 1 having such a configuration is used with the linear blade rotating unit 5 positioned below the plate-shaped rotating blade 4. When an engine or motor (not shown) is driven, the drive shaft 6 at the tip of the operating rod 2 rotates, and the plate-like rotary blade 4 and the linear blade rotary unit 5 rotate accordingly. During use, the plate-like rotary blade 4 can cut relatively hard grasses, small-diameter trees, and the like, and at the same time, the cord blades 10 extending radially from the linear blade rotary unit 5 are relatively soft grasses or the like. Can be cut from its root. And the plate-shaped rotary blade 4 is hard to contact the ground, and can suppress scattering of sand around.

  Further, in the state where the plate-like rotary blade 4 and the linear blade rotary unit 5 are connected to the operation rod 2, the plate-like rotary blade 4 and the linear blade rotary unit 5 are arranged as described above. The regulating portion 22 of the linear blade rotating unit 5 is passed through the regulated hole 26. Therefore, when the brush cutter 1 is used, there is no positional deviation in the rotational direction between the plate-like rotary blade 4 and the linear blade rotary unit 5.

  Further, as shown in FIG. 4, the restricting portion 22 protrudes from the upper surface of the linear blade rotating unit 5 in the vicinity of the outer peripheral portion which is a position relatively separated from the rotation axis. Therefore, the rotational force of the linear blade rotating unit 5 can be applied to the plate-shaped rotating blade 4 with a large moment, and relatively hard grasses and small-diameter trees can be easily cut. At the same time, it is possible to reliably prevent the displacement of the linear blade rotating unit 5 and the plate-shaped rotating blade 4 in the rotational direction.

  Further, since the linear blade rotating unit 5 is disposed so as to face the rotation axis, the rotational moment of the linear blade rotating unit 5 is allowed to act on the plate-shaped rotating blade 4 without causing positional bias. At the same time, the positional deviation between the linear blade rotating unit 5 and the plate-like rotating blade 4 can be more reliably prevented.

  Furthermore, since the restricting portion 22 is formed integrally with the mounting seat 19 and is made of metal, sufficient strength as the restricting portion 22 is ensured. Therefore, transmission of the rotational moment to the plate-like rotary blade 4 and prevention of displacement of the plate-like rotary blade 4 can be reliably realized. If an appropriate strength can be ensured, it is not necessary to be made of metal integrally with the mounting seat 19, and is formed integrally with the resin outer tube 16 of the upper case 14, as shown in FIG. May be. In addition to the number of four, the number may be one to three, may be five or more, and the arrangement of the restricting portions 22 is not necessarily on the same circumference. In the present embodiment, the restricting portion 22 that protrudes from the linear blade rotating unit 5 is provided and the regulated hole 26 into which the restricting portion 22 is inserted is provided in the plate-like rotating blade 4. The plate-like rotary blade 4 may be provided with a protrusion, and a hole or a recess into which the protrusion is inserted may be formed on the upper surface of the linear blade rotation unit 5.

  By the way, although the semiautomatic nylon cord cutter was illustrated as the linear blade rotation unit 5 in the above-mentioned description, you may employ | adopt another type of linear blade rotation unit. FIG. 10 is a drawing showing the configuration of a centrifugal force type linear blade rotating unit 51 that can be employed in the brush cutter 1, wherein (a) is a plan view thereof and (b) is a side view thereof. FIG. 11 is a drawing showing a configuration of a simple linear blade rotating unit 52 that can be employed in the brush cutter 1, (a) is a plan view thereof, and (b) is a side view thereof.

  The centrifugal force type linear blade rotating unit 51 shown in FIG. 10 has a configuration in which the cylindrical portion 60 is sandwiched with the centers thereof being matched between upper and lower disks 61 and 62 arranged opposite to each other. Further, three pins 63 are installed between the disks 61 and 62 at equal intervals along the circumferential direction. A cord blade 64 folded in half is wound around the cylindrical portion 60 of the linear blade rotating unit 51, and both ends of the cord blade 64 extend outward through the pins 63. And the control part 65 is protrudingly provided by the upper surface of the upper disk 61 similarly to the linear blade rotation unit 5 mentioned above.

  Further, the simple linear blade rotating unit 52 shown in FIG. 11 has a reel-like configuration in which the center portion is matched between the upper and lower disks 71 and 72 arranged to face each other and the cylindrical portion 70 is sandwiched. A cord blade 74 that is folded in half is wound around the cylindrical portion 70. Further, either one of the upper and lower disks 71 and 72 is provided with a locking portion (not shown) for locking the cord blade 74 extending outward from the cylindrical portion 70. And the control part 75 is protrudingly provided by the upper surface of the upper disk 71 similarly to the linear blade rotation unit 5 mentioned above.

  Even when the linear blade rotating units 51 and 52 shown in FIGS. 10 and 11 as described above are employed, the brush cutter 1 has the same operation and effect as when the linear blade rotating unit 5 described above is employed. Can play.

  Further, the brush cutter 1 according to the present embodiment is not limited to a tip saw such as the plate-like rotary blade 4 shown in FIG. 5, and a plate-like rotary blade having another configuration can be adopted. FIG. 12 is a plan view showing the configuration of another plate-like rotary blade that can be employed in the brush cutter 1. FIG. 12A is a two-blade type cutting blade 81, and FIG. 12B is a four-blade type cutting blade. The blades 82 and (c) show the circular saw blade 83, respectively. Each of these types of blades 81 to 83 is generally widely distributed. Two opposed regulated holes 85 are formed for the two-blade type cutting blade 81, and the four-blade type cutting blade 82 and the circular saw blade 83 for the plate-like rotary blade 4 shown in FIG. 5. Similarly to the above, four regulated holes 85 are formed. Even when the cutting blades 81 and 82 and the circular saw blade 83 having such a configuration are employed, the brush cutter 1 can achieve the same operational effects as the case where the plate-like rotary blade 4 described above is employed. it can.

  The present invention is capable of simultaneously cutting soft grass and small-diameter trees and the like, and a brush cutter suitable for cutting grass and the like from the root, and a linear blade rotating unit and plate-like rotation used for the brush cutter Can be applied to blades.

FIG. 1 is an assembly diagram of a portable brush cutter according to the present embodiment, and a part thereof is shown in cross section around a blade periphery. FIG. 2 is an enlarged view showing the detailed configuration of the linear blade rotation unit shown in FIG. 1, and shows a cross section when cut along a plane including the rotation axis. 3 is an exploded perspective view of the linear blade rotating unit shown in FIG. FIG. 4 is a plan view of the linear blade rotating unit. FIG. 5 is a plan view of the plate-like rotating body. FIG. 6 is an assembly diagram for explaining a connection procedure of the operation rod, the plate-like rotary blade, and the linear blade rotary unit, and the linear blade rotary unit is shown in cross section. FIG. 7 is a side view showing a connection form of the operating rod, the plate-like rotary blade, and the linear blade rotary unit. FIG. 8 is a plan view showing a connection form between the plate-like rotary blade and the linear blade rotary unit, the operation rod is omitted, and the plate-like rotary blade is indicated by a two-dot line. It is side surface sectional drawing which shows the other structure of the control part provided in a linear blade rotation unit. FIG. 10 is a drawing showing a configuration of a centrifugal force type linear blade rotating unit that can be employed in a brush cutter, wherein (a) is a plan view thereof and (b) is a side view thereof. FIG. 11 is a drawing showing the configuration of a simple linear blade rotating unit that can be employed in a brush cutter, where (a) is a plan view thereof and (b) is a side view thereof. FIG. 12 is a plan view showing the configuration of another plate-shaped rotary blade that can be employed in the brush cutter, where (a) is a two-blade type cutting blade and (b) is a four-blade type cutting blade. (C) shows a circular saw blade, respectively. FIG. 13 is an exploded perspective view showing a configuration of a conventional brush cutter.

Explanation of symbols

1 Brush cutter 2 Operating rod (main unit)
4 plate-like rotary blade 4a blade 5 linear blade rotary unit 6 drive shaft (rotation output part)
DESCRIPTION OF SYMBOLS 10 Code blade 13 Case 14 Upper case 15 Lower case 16 Outer cylinder 17 Inner cylinder 19 Mounting seat (contact part)
22 restricting part 26 restricted hole 51 centrifugal force type linear blade rotating unit 52 simple linear blade rotating unit 65 restricting part 75 restricting part 81 two blade cutting blade 82 four blade cutting blade 83 circular saw blade 85 Regulated hole

Claims (9)

A main body having a rotation output section;
A linear blade rotating unit that is connected to the rotation output unit below the main body and that cuts an object during rotation by a flexible linear blade extending outward, and above the linear blade rotating unit A brush cutter comprising a plate-like rotary blade that is interposed between the main body and the linear blade rotating unit and cuts an object during rotation by a blade provided on a peripheral portion.   The upper surface of the linear blade rotating unit is provided with a regulating portion that regulates the position of the plate rotating blade with respect to the linear blade rotating unit by engaging with the plate rotating blade. The brush cutter according to claim 1.   3. The brush cutter according to claim 2, wherein the restricting portion protrudes from an upper surface of the linear blade rotating unit, and the plate-like rotating blade has a restricted hole into which the restricting portion is inserted. .   The brush cutter according to claim 2 or 3, wherein the restricting portion is provided in the vicinity of an outer peripheral portion on an upper surface of the linear blade rotating unit.   The brush cutter according to any one of claims 2 to 4, wherein the restricting portion is disposed to face the rotation axis of the linear blade rotating unit.   The linear blade rotation unit has a metal contact portion that contacts the rotation output portion of the main body, and the restriction portion is integrally formed with the contact portion. The brush cutter according to any one of 2 to 5.   The rotation output portion of the main body includes a drive bolt that extends downward and rotates about an axis, and the contact portion of the linear blade rotation unit and the plate-shaped rotation blade are passed through the drive bolt. The linear blade rotating unit and the plate-shaped rotating blade are inserted into the main body by screwing a nut onto the drive bolt in a state of being passed through the insertion holes. The brush cutter according to any one of claims 2 to 6, wherein the brush cutter is connected. A linear blade rotating unit that cuts an object during rotation by a flexible linear blade that is connected to the brush cutter body from below with a plate-shaped rotating blade interposed therebetween, and extends outward,
A linear blade rotating unit for a brush cutter, comprising a restricting portion on an upper surface for restricting a position of the plate rotating blade with respect to the linear blade rotating unit by engaging with the plate rotating blade. Interposed between a brush cutter main body and a linear blade rotating unit that is positioned below the brush cutter main body and that cuts an object during rotation by a flexible linear blade extending outward. A plate-like rotary blade that cuts an object during rotation by a blade provided in
A plate-shaped rotary blade of a brush cutter, comprising a regulated hole into which a regulating portion protruding from the upper surface of the linear blade rotating unit is fitted.

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