JP5379755B2 - Brush cutter - Google Patents

Description

  The present invention relates to a brush cutter for use in cutting weeds and the like, and more particularly, to a brush cutter that can prevent the brush cutter from being caught in the central portion of a rotary blade of the brush cutter.

  Conventionally, a brush cutter has a head member attached to one end of an operation member containing a member for transmitting a driving force from a driving source such as an engine, and a rotary blade having a rotation shaft in the center is rotatably attached to the head member for operation. The other end of the member is connected to the engine, and the rotary blade is rotated at high speed by the driving force of the engine. This rotary blade is provided with a plurality of cutting blades on the outer periphery, and an object to be cut off such as weeds can be easily mowed by rotating the rotary blade at high speed and swinging left and right.

  In this brush cutter, the operation member includes a handle such as a loop handle, a two-grip handle, or a two-hand handle, and a throttle lever is provided on the grip of the operation member or the handle. The user can control the rotation and stop of the rotary blade by adjusting the vertical or horizontal posture of the operation member with the handle and operating the throttle lever.

  As a problem common to brush cutters having a rotary blade that rotates at high speed in this way, when the weeds and the like are cut off mainly by the rotary blade, the brushed material is wound around the head member, that is, the central portion of the rotary blade. There is a problem that the rotation of the rotary blade fluctuates or stops.

  In addition, as another problem, for example, during cutting work, the rotating blade is accidentally brought into contact with a hard obstacle such as concrete that is not subject to cutting, and the rotating blade may be damaged. There has been a problem in that workability is lowered due to contact and generation of shock and annoying contact sound. In addition, the above-described brush cutter requires that the user always maintain the height from the ground to the rotary blade when the height of the portion to be trimmed is to be kept constant. When an object is on a slope, there is a problem that it becomes a burden on the user and it becomes difficult to work for a long time.

  In order to solve these problems, various proposals have been made. For example, Patent Document 1 discloses a grass cutter that is attached to a mowing machine that has a rotating mowing blade at the tip, and receives the cut grass cut by the mowing blade and moves the grass cutter along with the swinging mowing operation of the mowing machine. Thus, there has been proposed a mowing machine in which a main body of a grass cutter is formed of a rod-like body that is horizontally placed above the mowing blade and a convex or concave grass hanging portion is formed.

  According to the present invention, the grass that is cut and scattered by the mowing blade of the mower can be received by the grass gathering tool, and the cut grass can be efficiently brought to one side. Thus, it is possible to prevent the brushed material from being caught in the central portion of the rotary blade.

  In order to solve the other problems described above, Patent Document 2 discloses that a support body on which a rotary blade having a blade portion on its outer periphery is rotatably supported is connected to an engine via an operation member. In the provided oscillating mower, an oscillating mower having a sled portion for actively holding a support on the ground surface on both sides of the rotary blade has been proposed.

  According to this invention, both sides of the rotary blade can be protected by the sled portion, and the height from the ground to the rotary blade can be kept constant, so the burden on the user can be reduced. it can.

  Further, Patent Document 3 discloses a guide structure for a brush cutter used in a brush cutter in which a brush cutter driven to rotate at the tip of a handle shaft is rotatably provided. Applying a mounting structure of a guide unit for a brush cutter that is mounted on a side so that the guide unit can be rotated relative to a rotating shaft on which a brush cutter blade is mounted via a bearing. Has been proposed.

  According to the present invention, by providing the guide portion, it is possible to reduce the occurrence of an impact or an annoying contact sound caused by the contact between the cutting blade and the ground or stone during mowing work, and rotation. By bringing the flexible guide portion into contact with the ground, the user can work by swinging the brush blade smoothly to the left and right, and the burden on the user can be reduced.

JP 2003-143919 A Japanese Utility Model Publication No. 02-134821 JP 2008-182964 A

  However, in the above-mentioned patent document 1, when the length of the brush cutter is longer than the outer periphery of the head member, the brush cutter is wound around the outer peripheral portion of the head member, that is, the central portion of the rotary blade. There was still a problem that a malfunction such as stopping of rotation occurred. As a result, it is necessary to temporarily suspend the work for removing the wound brushed material, and there is a problem in that workability is significantly reduced. Further, in the invention of Patent Document 1, it is necessary to switch the attachment and detachment of the weeding tool according to the state of mowing such as weeds, which also causes a problem of reducing workability.

  An object of the present invention is to provide a brush cutter that can easily prevent the brush cutter from being caught in the central portion of the rotary blade of the brush cutter.

  Another object of the present invention is to provide a brush cutter that can protect the rotary blade from an external obstacle and can easily keep the height from the ground to the rotary blade constant.

The brush cutter according to the present invention includes an operation member, a head member provided at one end of the operation member, a drive source provided at the other end of the operation member, and a rotary blade rotatably connected to the bottom of the head member When, is composed of a rotary blade protection member is found on the bottom side of the rotary blade, wherein the head member is connected to the rotary blade to form a predetermined elevation angle of the operation member with respect to the upper surface of the rotary blade In the brush cutter that is configured to be rotated by the driving force of the driving source, the upper surface of the rotary blade is concentric with the outer periphery of the rotary blade, and the outer diameter of the bottom portion of the head member is A plurality of protrusions are provided on the concentric circle that is enlarged to be close to the head member and extend in a direction perpendicular to the upper surface. The protrusions, the head member, and the upper surface of the rotary blade Space created between Attached to the operating member, one side surface of the tip is disposed with a gap on the side surface of the projection, and the other side surface of the tip is disposed with a gap on the bottom of the head member. In this case, there is provided a brushed material entrainment preventing member having a tip portion whose bottom surface is disposed with a gap on the upper surface of the rotary blade.

In the brush cutter of the present invention, the upper surface of the rotary blade is concentric with the outer periphery of the rotary blade, and is on a concentric circle larger than the concentric circle larger than the outer diameter of the bottom of the head member. A plurality of other protrusions are provided close to the protrusions and extending in a direction perpendicular to the upper surface, and are generated between the protrusions, the other protrusions, and the upper surface of the rotary blade. Is attached to the head member, and one side surface of the tip is disposed with a gap on the side surface of the projection, and the other side surface of the tip is placed on the side surface of the other projection. And an additional anti-wrinkle material entrainment member having a tip portion with the bottom surface of the tip disposed with a gap on the upper surface of the rotary blade.

Brush cutter of the present invention, also, the rotation on both sides of the blade protection member extends in the longitudinal direction of the operating member, both ends sled member warped rotary blade side provided with a plurality each of both sides of the rotary blade protection member The width dimension between the sled members provided on the outside of the sled members provided on the surface is larger than the outer diameter of the rotary blade, and a predetermined height interval is provided between the sled member and the rotary blade. It is characterized by being provided.

  Since the brush cutter of the present invention is configured as described above, it is possible to easily prevent the brush cutter from being wound around the central portion of the rotary blade, and it is possible to prevent the user from deteriorating workability. In addition, since the user can easily maintain a constant height from the ground to the rotary blade, fatigue due to long-time work by the user can be reduced. Furthermore, since the rotary blade can be protected from external obstacles, significant wear of the rotary blade can be suppressed and can be used economically.

The schematic perspective view which shows the external appearance of the brush cutter which is an Example of this invention. The longitudinal cross-sectional view of the brush cutter which is an Example of this invention. The schematic bottom view of the brush cutter which is an Example of this invention. The schematic side view of the brush cutter of FIG.

  Hereinafter, a brush cutter according to an embodiment of the present invention will be described with reference to the drawings. However, the configuration of the drive source and the detailed configuration of the operation member applied to the brush cutter according to the present embodiment will be described without using a conventional configuration as illustrated.

FIG. 1 shows the appearance of a brush cutter 100 according to an embodiment of the present invention. Moreover, the longitudinal cross-sectional view of this brush cutter 100, a side view, and a bottom view are shown in FIG.2, FIG.3, FIG.4, respectively.

  As shown in FIG. 1, the brush cutter 100 in the embodiment of the present invention includes an operation member 1, a head member 2 provided at one end of the operation member 1, and a drive source (not shown) provided at the other end of the operation member 1. And a rotary blade 3 rotatably connected to the bottom 2A of the head member 2 and a rotary blade protection member 4 connected to the bottom center 3A of the rotary blade 3.

  The head member 2 is configured to connect the operating member 1 to the rotary blade 3 by forming a predetermined elevation angle 5 with respect to the upper surface 3B of the rotary blade 3, and the rotary blade 3 is driven by a driving force from a driving source. It is configured to be rotationally driven.

  Further, the rotary blade protection member 4 is provided with a sled member 40 having a sled portion 4A at both ends, and one of the sled portions 4A is inclined at the one end toward the rotary blade 3 rather than the sled portion 4A. A protruding portion 51 is provided. One end of the protruding portion 51 and one end of the L-shaped connecting member 52 are connected by a connecting portion 53, and the other end of the connecting member 52 and the operation member 1 are connected by a connecting portion 54. It has a configuration.

  The sled portion connection side 52 </ b> A of the connection member 52 is provided in parallel to the central axis of the operation member 1. Thereby, the user can adjust the elevation angle of the rotary blade 3 with respect to the ground with the bottom 4B of the sled member 40, that is, the grounding portion 4B, as a fulcrum by adjusting the elevation angle of the connection member 52 with respect to the ground. That is, it is possible to appropriately adjust the height of the mowing point from the ground of the mowing object.

  The coupling portions 53 and 54 are provided with female screw portions or through holes 53A and 54A, respectively, and by connecting or fitting a coupling member such as a male screw to the coupling portions 53 and 54, each member 1, 51, 52 is configured to be fastened and fixed.

  The configuration of the operation member 1 and the drive source of the brush cutter 100 described above will be described in detail below. The operation member 1 has a rod-like elongated shape, and a drive transmission shaft for transmitting a driving force from the driving source is provided therein so that the driving force is transmitted from the driving source to the rotary blade 3. It is configured.

  In addition, a U-shaped handle for the user to operate the behavior of the rotary blade 3 during the mowing operation is attached near the center of the operation member 1. A grip is attached. As a result, the user can easily adjust the vertical or horizontal posture of the rotary blade 3 via the operation member 1 while holding the handle with both hands.

  Further, the operating member 1 or the left and right grips are provided with a throttle lever that can control the driving force of a driving source, which will be described later. The driving force is controlled by operating this throttle lever, and the rotational speed of the rotary blade 3 is controlled. Can be freely controlled. For example, the rotation and stop of the rotary blade 3 can be easily switched by operating the throttle lever.

The driving source is configured mounted clutch internal combustion engine for rotating the rotary blade 3 via the drive transmission shaft provided in the operating member 1 through a fitting at the other end of the operating member 1 ing. Further, gasoline is used as the fuel of the clutch type internal combustion engine, and for this reason, a fuel tank is attached to the internal combustion engine.

  The driving source of the brush cutter 100 of this embodiment is configured to rotationally drive the rotary blade 3 by transmitting the driving force generated by the clutch type internal combustion engine to the drive transmission shaft. The driving source of the brush cutter 100 according to the present embodiment is capable of driving the rotary blade 3 at a high speed and controlling the rotational speed of the rotary blade 3 to some extent by a throttle lever capable of controlling the driving force of the drive source described above. Needless to say, another drive source can be applied.

  Next, the structure of the head member 2 and the rotary blade 3 will be described in detail with reference to FIG. The inside of the head member 2 has a hollow structure and is provided with a drive mechanism unit 10. The drive mechanism unit 10 is configured to connect a drive transmission unit of the operation member 1 and the rotary blade 3 to transmit a driving force to the rotary blade 3.

  Further, the bottom portion 2 </ b> A of the head member 2 is provided so as to be substantially in contact with the upper surface 3 </ b> B of the rotary blade 3. The head member 2 is configured such that the operation member 1 forms a predetermined elevation angle 5 with respect to the upper surface 3B of the rotary blade 3 by the outer wall 2D. The elevation angle 5 is determined by examining the average height position of the hand holding the handle of the human operation member 1, the distance from the user to the rotary blade 3, and the length of the operation member 1. An angle that is easy to use on average is set.

  Hereinafter, the drive mechanism unit 10 will be described in detail with reference to FIG. In the drive mechanism 10, the rotary shaft 30 is inserted into an insertion hole 3 </ b> D formed in the center of the rotary blade 3, and the rotary blade 3 is sandwiched between the clamping member 31, the pressing member 32, and the inner case 33. And fixedly attached to the rotary shaft 30.

  Further, the rotary shaft 30 is provided with a rotary power transmission unit (not shown) inside the head member 2, and the rotary shaft 30 and the drive transmission unit of the operation member 1 are connected via the rotary power transmission unit. . The rotational power transmission unit is constituted by, for example, a plurality of bevel gears, and is configured to convert the driving force by the drive transmission unit into the rotational force of the rotary shaft 30, that is, the rotational force of the rotary blade 3.

  The clamping member 31 is a disk-like body, and is coupled to the rotary shaft 30 by, for example, a female screw 31A formed at the center being screwed into a male screw 30A formed on the rotary shaft 30. The inner case 33 is a substantially cup-shaped body facing downward, and the rotating shaft 30 is inserted through an insertion hole 33A formed at the center. A nut 34 is screwed onto the tip of the rotary shaft 30, and by tightening the nut 34, the inner case 33 is pressed against the rotary blade 3 and the sandwiching member 31 via the pressing member 32, thereby rotating the rotary blade. 3 is fixedly attached to the rotary shaft 30.

  Further, the inner case 33 has an inner peripheral surface of the bearing 35 mounted on the outer peripheral surface, and a nut 34 is accommodated on the inner side. As the bearing 35, for example, a ball bearing such as a radial ball bearing is used. Similarly, a bearing 36, which is a ball bearing, is mounted on the rotary shaft 30 above the clamping member 31. Further, locking members 37 and 38 are mounted on the outer peripheral surfaces of the pressing member 32 and the bearing 35, and the pressing member 32 and the bearing 35 are locked so as not to be displaced outward.

  The drive mechanism unit 10 is configured as described above, and the rotary blade 3 is configured to be rotatable by the rotating shaft 30 of the drive mechanism unit 10 via the clamping member 31, the pressing member 32, the inner case 33, and the nut 34. The That is, the rotary blade 3 is rotatably connected to the bottom 2 </ b> A of the head member 2 via the drive mechanism unit 10.

  The rotary blade 3 used in the brush cutter 100 of the present embodiment is a metal disc, and a plurality of convex portions 3E and concave portions 3F are alternately formed along the outer periphery 3C of the disc, and the convex portions 3F are formed on the convex portions 3F. The blade 3G is formed. Such a rotary blade 3 may be used by replacing the blade 3G with a carbide tip.

  As shown in FIG. 3, the rotary blade protection member 4 used in the brush cutter 100 according to the present embodiment is configured such that the protection member bottom portion 4 </ b> C is fitted and fixed to the outer peripheral surface of the locking member 38. The protective member bottom 4C is provided with a fitting hole 41, a vertical protrusion 42, a horizontal protrusion 43, and a cylindrical part 44. Further, the fitting hole 41 is configured to be fitted and connected to the outer peripheral surface 38A of the locking member 38 described above. Further, the locking lid 39 is fixedly attached to the bottom of the locking member 38 by screwing or the like so as to be fitted to the inner peripheral surface of the fitting hole 41.

  Further, the rotary blade protection member 4 is in the vicinity of the outer periphery of the cylindrical portion 44 on both sides of the protection member bottom portion 4 </ b> C, and inner sled members 45 are respectively provided on the bottom portions of the lateral protrusions 43. Further, at both ends of the sled member 45, a sled portion 4A warped toward the rotary blade 3 is provided. Furthermore, a sled member 40 is provided at each end of the lateral protrusion 42, that is, outside the inner sled member 45. At both ends of the sled member 40, similarly to the sled member 45 described above, sled portions 4A that warp toward the rotary blade 3 are provided. One of the sled portions 4A is provided with the protruding portion 51 as described above.

  Further, the vertical protrusion 42 and the sled members 40 and 45 are provided so as to extend in the longitudinal direction of the operation member 1. This is because the user smoothly moves the operation member 1 in the pushing direction, that is, the longitudinal direction of the operation member 1.

Further, as shown in FIG. 2, the sled members 40 and 45 are provided at a predetermined height interval 6 from the rotary blade 3. Further, the outer sled portions 4A provided at both ends of the rotary blade protection member 4 are provided such that the width dimension 7 at each end is larger than the outer periphery 3C of the rotary blade.

Further, as shown in FIG. 4, the brush cutter 100 of the present embodiment is concentric with the outer surface 3 </ b> C of the rotary blade 3 on the upper surface 3 </ b> B of the rotary blade 3 and is larger than the outer diameter 2 </ b> C of the bottom 2 </ b> A of the head member 2. A plurality of protrusions 11 are provided on the enlarged concentric circle 13 so as to be close to the head member 2 and extend in a direction perpendicular to the upper surface 3B.

  Further, the brushed material entrainment preventing member 21 is attached to the operation member 1. The brushed material entrainment preventing member 21 is disposed in the space 16 generated between the projection 11, the head member 2, and the upper surface 3 </ b> B of the rotary blade 3. Further, the front end portion 21A of the brushed material entrainment preventing member 21 is arranged such that one side surface 21B of the front end is spaced from the side surface 11A of the projection 11 and the other side surface 21C of the front end is the head member 2. The bottom 2A is arranged with a gap, and the bottom 21D of the tip is arranged with a gap on the upper surface 3B of the rotary blade 3.

In a preferred configuration, the brush cutter 100 according to the present embodiment is preferably configured such that the upper surface 3B of the rotary blade 3 is concentric with the outer periphery 3C of the rotary blade 3 and is arranged on a circle of the concentric circle 14 larger than the concentric circle 13 described above. The protrusions 12 are provided so as to extend close to the protrusions 11 and in a direction perpendicular to the upper surface 3B.

  Further, the brushed material entrainment preventing member 22 is attached to the head member 2. The brushed material entrainment preventing member 22 is disposed in the space 17 generated between the protrusion 11, the other protrusion 12, and the upper surface 3 </ b> B of the rotary blade 3. Further, the distal end portion 22A of the brushed material entrainment preventing member 22 is arranged such that one side surface 22B of the distal end is spaced from the side surface 11B of the projection 11, and the other side surface 22C of the distal end is the other projection. Twelve side surfaces 12 </ b> A are arranged with a gap, and the bottom surface 22 </ b> D of the tip is arranged with a gap on the upper surface 3 </ b> B of the rotary blade 3. Hereinafter, the protrusions 11 and 12 and the brushed material entrainment preventing members 21 and 22 will be described in detail.

  As the protrusions 11 and 12 of the rotary blade 3 used in the brush cutter 100 of the present embodiment, scissors such as rivet pins having dish portions 11C and 12C and protrusion portions 11D and 12D are used, respectively, and the lower surface of the rotary blade 3 is used. Mounted from 3H, the protrusions 11D and 12D are provided so as to extend in the vertical direction with respect to the upper surface 3B of the rotary blade 3, respectively. For this reason, as shown in FIG. 2, the rotary blade 3 is provided with a through-hole 3J for allowing the protrusions 11D and 12D to penetrate from the lower surface 3H to the upper surface 3B. These protrusions 11 and 12 are caulked and fixed to the through hole 3J so as not to be detached from the rotary blade 3.

Further, a plurality of the protrusions 11 are provided in such a manner that the central axis of the protrusion 11 is arranged on a concentric circle 13 shown in FIG. The concentric circle 13 is a concentric circle with the outer periphery 3C of the rotary blade 3, and is larger than the outer diameter 2C of the bottom 2A of the head member 2. Further, like the protrusion 11, a plurality of the protrusions 12 described above are provided so that the central axis of the protrusion 12 is arranged on a concentric circle 14 shown in FIG. 4. The concentric circle 14 is a circle concentric with the outer periphery 3C of the rotary blade 3 like the concentric circle 13, and is larger than the concentric circle 13 described above.

  More specifically, four protrusions 11 and 12 are provided for every 90 degrees of the central angle of the concentric circle 13. Further, the positions where these protrusions 11 and 12 are provided are different from each other by a central angle of 45 degrees. That is, one of the protrusions 11 and 12 is provided on the upper surface 3B of the rotary blade 3 every 45 degrees of the central angle.

  Further, the outer diameter of the concentric circle 13 on which the protrusion 11 is provided is set to a size such that the protrusion 11 is close to the head member 2, and the outer diameter of the concentric circle 14 on which the protrusion 12 is provided is that the protrusion 12 is close to the protrusion 11. It is not oversized as large as you want.

  As shown in FIG. 4, the brushed material entrainment preventing member 21 used in the brush cutter 100 according to the present embodiment includes a cover member 26 and a plate material 27 having a predetermined plate thickness, and the cover member 26 is used as the operation member 1. The cover member 27 is used by being attached to the operation member by a connecting portion 28 provided at the end of the cover member 27.

  The plate member 27 is provided in the lower part of the operation member 1, and both side surfaces of the plate member 27 are provided in parallel with the vertical direction of the upper surface 3 </ b> B of the rotary blade 3. The plate member 27 is provided with a tip 21A having a predetermined shape. The distal end portion 21 </ b> A is disposed in the space portion 16 generated between the protrusion 11, the head member 2, and the upper surface 3 </ b> B of the rotary blade 3. Hereinafter, the tip portion 21A will be described in detail.

  The front end portion 21A has one side surface 21B disposed with a gap on the side surface 11A of the projection 11, the other side surface 21C of the front end disposed with a gap on the bottom portion 2A of the head member 2, and the front end portion 21A. The bottom surface 21 </ b> D has a tip shape such that the bottom surface 21 </ b> D is arranged with a gap on the upper surface 3 </ b> B of the rotary blade 3. Accordingly, the distal end portion 21A has a substantially rectangular shape in longitudinal section. These gaps are set to have a gap substantially equal to zero so that the tip 21A does not come into contact with the protrusion 11 or the upper surface 3B of the rotary blade 3 when the rotary blade 3 rotates.

  Further, the brushed material entrainment preventing member 22 is configured such that a plurality of connection portions 24 are provided on a plate member 23 having a predetermined plate thickness, and the side surface of the head member 2 and each of the connection portions 23 and 24 are screwed together. It is used by attaching and fixing by, for example.

  The plate member 23 is provided in parallel with the operation member 1. The plate member 23 is provided with a tip 22A having a predetermined shape. The tip portion 22 </ b> A is disposed in the space portion 17 generated between the protrusions 11 and 12 and the upper surface 3 </ b> B of the rotary blade 3. Hereinafter, the tip portion 22A will be described in detail.

  The tip 22A has one side 22B arranged with a gap on the side 11B of the projection 11, the other side 22C of the tip is arranged with a gap on the side 12A of the projection 12, and the bottom of the tip The tip shape is such that 22D is disposed on the upper surface 3B of the rotary blade 3 with a gap. Accordingly, the front end portion 22A has a substantially rectangular shape in the longitudinal section like the above-described front end portion 21A. Similarly to the tip portion 21A, these gaps have a gap substantially equal to zero so that the tip portion 22A does not contact the protrusions 11 and 12 and the upper surface 3B of the rotary blade 3 when the rotary blade 3 rotates. Is set.

  The state of preventing the brushed material from being caught in the lawn mower 100 of the present embodiment having the above-described configuration will be described below. First, the rotary blade 3 of the brush cutter 100 is rotated at high speed. Accordingly, the protrusions 11 and 12 also rotate at high speed. Then, when weeds or the like are cut off by the rotating rotary blade 3, if the length of the cut material is larger than the outer diameter 2B of the bottom 2A of the head member 2, the bottom 2A of the head member, that is, the rotary blade 3 Try to scatter and wrap around the center.

  The long brush cutter always comes into contact with the tip portion 21A or 22A of the brush cutter entanglement member 21 or 22 when it is wound around the central portion of the rotary blade 3. However, the front end portions 21A and 22A of the brushed material entrainment preventing members 21 and 22 have both side surfaces 21B, 21C, 22B, and 22C, respectively, of the bottom portion 2A of the head member 2, the side surface 11A of the projection 11, or the projection 11 respectively. Since the side surface 11B and the side surface 12A of the projection 12 are provided without a substantial gap, the long cut brush that comes into contact with the tip portions 21A and 22A has the rotating projections 11 and 12 respectively connected to the tip portions 21A and 21A. When passing through the side surfaces 21B and 22C of 22A, a long brushed product is taken up by the torque caused by the rotation and discharged to the outside of the rotary blade 3, or the long brushed product is cut, and the long brushed product is in the center of the rotary blade 3. It plays a role to prevent the part from getting caught.

  In addition, since the front end portions 21A and 22A of the brushed material entrainment preventing members 21 and 22 are also provided with almost no gap between the bottom surfaces 22D and 22D and the upper surface 3B of the rotary blade 3, When paid out by the torque of the projections 11, 12, it is not possible to go around the gap between the bottom surfaces 21 D, 22 D of the tip and the upper surface 3 B of the rotary blade 3.

  As described above, the bush cutter 100 according to the present embodiment is provided with the protrusions 11 and 12 and the bush cutter entanglement preventing members 21 and 22, and the central portion of the rotary blade 3 including the rotary shaft 30 is provided. It is possible to reliably prevent long cuts from being caught. The brush cutter 100 according to the present embodiment can prevent the long brush cutter from being caught in the central portion of the rotary blade as described above by using only the protrusion 11 and the brush cutting prevention member 21. Providing the object 12 and the brushed material entrainment preventing member 22 can more effectively prevent the mowing object from being caught in the central portion of the rotary blade.

  Further, the brush cutter 100 of the present embodiment is shaped so that a gap substantially equal to zero is placed on the upper surface of each projection 11, 12 in the vicinity of the tip portions 21 A, 21 B on the upper surface side of each projection 11, 12. Providing 21E and 22E, respectively, can more effectively prevent the brushed material from being caught in the central portion of the rotary blade.

  The brush cutter 100 according to the present embodiment includes the height of the protrusions of the protrusions, the number of protrusions, the arrangement pitch of the protrusions and other protrusions, and the radial direction of the tip of the anti-roll member in the rotary blade direction. The size and the size of the outer diameter of the projection of the projection, that is, the size of the space portion in the rotational radius direction, and the like can be changed as appropriate according to the usage state of the brush cutter 100, and have the above-described configuration. It goes without saying that it is not limited. Moreover, it cannot be overemphasized that the shape of the brushing thing entrainment prevention members 21 and 22 which comprise the brush cutter 100 of a present Example is not limited to the shape shown in the figure within the range which can achieve the above-mentioned effect.

As described above, the brush cutter according to the present embodiment includes the sled portion having the rotary blade and a predetermined height position on the rotary blade protection member, so that the user can easily hold the height position of the rotary blade. In particular, since the rotary blade can be moved smoothly along the traveling direction of the operation member, that is, the front-rear direction, the brushing work by the user is stabilized, and fatigue due to long-time work can be reduced. Furthermore, since the width dimension between both ends between the sled portions is made larger than the outer diameter of the rotary blade, the wear of the blade due to contact of the rotary blade with an external hard obstacle can be reduced.

  Moreover, in the brush cutter of a present Example, the shaving operation by a user becomes stable as mentioned above by providing a sledge part in the bottom part of a rotary blade. As a result, weeds and the like can be more easily cut off from the root, and the length can be easily reduced compared with a brush cutter that does not have a sledge and swings the rotary blade to the left and right to cut off the weeds and the like. Will produce a long cut. Therefore, the brush cutter according to the present embodiment can prevent a long brush cutter from being wound around the central portion of the rotary blade, and is particularly effective for a general-purpose brush cutter having a sled portion at the bottom of the rotary blade. .

  Since the present invention is configured as described above, it is possible to easily prevent the brushed material from being wound around the central portion of the rotary blade, and it is possible to prevent the workability by the user from being deteriorated. In addition, since the user can easily maintain a constant height from the ground to the rotary blade, fatigue due to long-time work by the user can be reduced. Furthermore, since the rotary blade can be protected from external obstacles, significant wear of the rotary blade can be suppressed and can be used economically.

DESCRIPTION OF SYMBOLS 1 ... Operation member, 2 ... Head member, 2A ... Bottom part of head member, 2B ... Outer diameter of bottom part of head member, 3 ... Rotary blade, 3A ... Center part of bottom part of rotary blade, 3B ... Upper surface of rotary blade, 3C ... outer diameter (outer circumference) of rotating blade, 4 ... rotating blade protecting member, 4A ... sled portion, 4C ... bottom, 5 ... elevation angle, 11, 12 ... projection, 11C, 12C ... side surface of projection, 13, 14 ... Rotating blade outer diameter concentric circles, 16, 17 ... space part, 21, 22 ... cutting material entrainment prevention member, 21C, 22C ... tip part, 21D, 22D, 21E, 22E ... tip part side face, 21F, 22F ... tip Bottom surface, 60 ... width dimension between both side sled parts, 61 ... height interval, 100 ... brush cutter.

Claims (3)

An operation member, a head member provided at one end of the operation member, a drive source provided at the other end of the operation member, a rotary blade rotatably connected to the bottom of the head member, and a bottom of the rotary blade A rotary blade protection member connected to a central portion, and the head member is configured to connect the operation member to the rotary blade by forming a predetermined elevation angle with respect to the upper surface of the rotary blade, In the brush cutter that is driven to rotate by the driving force of the driving source,
The upper surface of the rotary blade is concentric with the outer periphery of the rotary blade, and a plurality of protrusions are close to the head member on a concentric circle made larger than the outer diameter of the bottom of the head member, and It is provided so as to extend in a direction perpendicular to the upper surface, and is attached to the operation member in a space generated between the protrusion, the head member, and the upper surface of the rotary blade, and one side surface of the tip is The protrusion is disposed with a gap on the side surface, the other side surface of the tip is disposed with a gap at the bottom of the head member, and the bottom surface of the tip is disposed with a gap on the upper surface of the rotary blade. A brush cutter comprising: a brush cutter prevention member having a tip portion that is provided. 2. The upper surface of the rotary blade according to claim 1, wherein the upper surface of the rotary blade is concentric with the outer periphery of the rotary blade, and a plurality of other concentric circles are formed on a concentric circle larger than the concentric circle larger than the outer diameter of the bottom of the head member. A space formed between the protrusion, another protrusion, and the upper surface of the rotary blade, the protrusion being provided so as to extend in a direction perpendicular to the upper surface and the protrusion. Attached to the head member, one side surface of the tip is disposed with a gap on the side surface of the projection, and the other side surface of the tip is disposed with a gap on the side surface of the other projection, brush cutter, wherein the other harvest払物winding prevention member having a tip bottom surface of the tip is placed with a gap on the upper surface of the rotary blade is provided. According to claim 1 or 2, wherein the rotation on both sides of the blade protection member extends in the longitudinal direction of the operating member, both ends sled member warped rotary blade side are provided a plurality respectively, on both sides of the rotary blade protection member The width dimension between each sled member provided outside among the provided sled members is larger than the outer diameter of the rotary blade, and a predetermined height interval is provided between the sled member and the rotary blade. A brush cutter characterized by that.

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