JP2013059289A - Brush cutter and cutting unit used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brush cutter that easily and efficiently carries out removal operations of weeds on a fence, wall surface, etc., without changing reaping blades.SOLUTION: The brush cutter includes blade press metal fittings 18, as a base 32, which sandwich a reaping blade 15 between a blade receiving metal fitting 17 attached to an output shaft 14 and the blade press metal fitting. Three wires 33a, 33b and 33c are fixed to a fixation face 32a facing the other side of the reaping blade 15 of the base 32. Both ends of each of the wires 33a, 33b and 33c are fixed to positions of point symmetry around the output shaft 14 as a center and the wires 33a, 33b and 33c are mutually shifted at equal intervals in the peripheral direction and arranged. The middle parts of the wires 33a, 33b and 33c are projected from the fixation face 32a and the wires are formed into a curved shape and members to be cut such as vines, etc., winding around a fence are cut by the wires 33a, 33b and 33c rotating together with the output shaft 14.

Description

  The present invention relates to a portable brush cutter that cuts away cutting objects such as weeds and undergrass by driving a cutting blade provided at the tip of an operating rod with a driving source.

  Portable mowers are used to mow weeds and undergrowth that grow on the fields and forests of fields. The brush cutter includes an operating rod formed in the shape of a hollow rod. A gear case is attached to the tip of the operating rod, and a cutting blade is attached to an output shaft protruding from the gear case. A driving source is attached to the rear end of the operating rod, and the cutting blade is rotationally driven by this driving source. An engine, an electric motor, or the like is used as the drive source, and rotation of the drive source is transmitted to the output shaft through a transmission shaft housed in the operation rod and a bevel gear pair housed in the gear case. As such a brush cutter, there are a backpack type in which the driving source is mounted on the backrest and a shoulder type in which a loop belt attached to the operation rod is hung on the shoulder. Work is done with the handle attached to the bag in hand.

  As a cutting blade used for a brush cutter, a metal saw such as a circular saw type such as a tip saw or a deformed type having about 2 to 4 square blades projecting radially outward, and a nylon cord were used. There are nylon cutters, and various types of cutting blades are used according to the place of use and environment.

  Metal cutting blades such as a tip saw and a modified three-edged blade are widely used because they can efficiently cut hard grass. However, the work of cutting grass on the wall or on the road or the work of removing the vine wound around the fence is difficult to perform with a metal cutting blade because there is a risk of damage to the blade.

  Therefore, nylon cutters are used as cutting blades in places where metal cutting blades may be damaged, such as near walls, roads, and fences. In this case, for example, as shown in Patent Document 1, a reel case accommodating a nylon cord is attached to the output shaft, and a nylon cutter is constituted by the nylon cord drawn out from the reel case.

Japanese Patent Laid-Open No. 1-41282

  However, since the nylon cutter is configured to cut a material to be cut such as grass by rotating a thin nylon cord, even if you try to remove the vine wrapped around the fence or the grass attached to the wall with the nylon cutter, Only a part of the vine or grass can be cut. Therefore, in order to remove a vine and grass from a fence or a wall surface using a nylon cutter, it is necessary to change the position many times to cut the vine or grass, and in some cases, peel the vine or grass by hand. Further, since the nylon cutter breaks when the nylon cord hits a fence or the like, it is necessary to pull out the nylon cord from the lease case each time, and the work efficiency is not good.

  In addition, since a nylon cutter has a high possibility of scattering pebbles and the like, a tip saw is mainly used for a mowing operation in a residential area. For this reason, when removing fences and wall vines and grass, it is necessary to replace the cutting blade from a tip saw to a nylon cutter, which is complicated.

  The objective of this invention is providing the brush cutter which can perform the operation | work which removes grass, such as a fence and a wall surface, easily and efficiently, without replacing a cutting blade.

  The brush cutter of the present invention includes an output shaft that protrudes from a case attached to the tip of the operating rod and has a cutting blade attached to the tip side, and a drive source that is attached to the operating rod and rotationally drives the output shaft. A portable brush cutter provided with a plurality of protrusions that are attached to the distal end side of the output shaft, protrude in the axial direction of the output shaft, and are spaced apart from each other in the circumferential direction. It is characterized by.

  The brush cutter according to the present invention is characterized in that the protruding portion is provided to be bent. The brush cutter according to the present invention further includes a base that is attached to a distal end side of the output shaft and rotates together with the output shaft, and the protruding portion is circumferentially disposed on a fixed surface facing the opposite side of the cutting blade of the base. The both ends are fixed to the base and the middle part is a plurality of wire rods protruding from the fixed surface, and the object to be cut can be cut by the plurality of rotating wire rods. .

  The brush cutter according to the present invention is provided between a blade receiving bracket attached to the case side of the output shaft and the blade receiving bracket attached to a tip side of the output shaft than the cutting blade. And a blade pressing metal fitting that clamps and fixes the cutting blade, and the base is constituted by the blade pressing metal fitting. The brush cutter according to the present invention is provided between a blade receiving bracket attached to the case side of the output shaft and the blade receiving bracket attached to a tip side of the output shaft than the cutting blade. A blade pressing metal fitting that clamps and fixes the cutting blade, and the base is disposed on the opposite side of the blade pressing metal from the cutting blade. In the brush cutter according to the present invention, both ends of the wire are fixed to the fixed surface at point-symmetric positions about the axis of the output shaft, and an intermediate portion is formed in a curved shape, and is circumferentially connected to each other. It is characterized by being arranged at equal intervals. In the brush cutter according to the present invention, the wire is a wire.

  The cutting unit of the present invention can be attached to an output shaft that protrudes from a case attached to the tip of an operating rod of a brush cutter, and protrudes in the axial direction of the output shaft and is spaced apart from each other in the circumferential direction. It has a plurality of protruding portions that are formed. The cutting unit of the present invention is arranged in a circumferential direction on a base attached to an output shaft projecting from a case attached to the tip of an operating rod of a brush cutter, and a fixed surface facing the side opposite to the case of the base. The two ends are fixed to the base, and the intermediate portion has a plurality of wire rods protruding from the fixing surface, and the workpiece can be cut by the plurality of rotating wire rods.

  According to the present invention, the base is attached to the tip side of the cutting blade of the output shaft, and both ends are fixed to the base and the intermediate portion protrudes from the fixed surface on the fixed surface facing the side opposite to the cutting blade of the base. A plurality of wires are arranged in the circumferential direction so that the object to be cut can be cut by these wires rotating with the output shaft. When removing the grass and the like, the fence and the grass on the wall surface can be easily and efficiently cut and removed by the wire without replacing the cutting blade.

It is a perspective view of a brush cutter which is one embodiment of the present invention. It is a partially notched sectional view of the principal part of the front end side portion of the brush cutter. It is a side view of the cutting unit attached to the output shaft. FIG. 4 is a bottom view of the cutting unit shown in FIG. 3. It is explanatory drawing which shows the use condition of the brush cutter at the time of cut | disconnecting the vine wound around the fence with a cutting | disconnection unit. It is explanatory drawing which shows the state which is cutting the vine wound around the fence with the cutting unit. It is explanatory drawing which shows the state which attached only the cutting unit, without attaching a cutting blade to an output shaft. FIG. 8 is a partially cutaway sectional view of FIG. 7. FIG. 5 is a cross-sectional view showing a modification of the cutting unit shown in FIG. 4 and showing a case where the base of the cutting unit is formed separately from the blade pressing metal.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

  A brush cutter 11 shown in FIG. 1 is a portable brush cutter, and is used, for example, when cutting weeds, undergrowth, etc. that have grown on a field road or mountain forest.

  The brush cutter 11 has an operating rod 12 that is formed of a hollow rod-like member. A gear case 13 is attached to the tip of the operation rod 12, and a cutting blade 15 called a cutter is attached to an output shaft (drive shaft) 14 protruding from the gear case 13, as shown in FIG.

  A base 16 formed in a substantially disc shape is fixed to the base end portion of the output shaft 14 at the shaft center. The surface of the base 16 that faces away from the gear case 13 is a support surface 16a, and the support surface 16a has an annular convex portion that protrudes toward the opposite side of the gear case 13 (the front end side of the output shaft 14). 16b is provided integrally.

  A blade receiving bracket 17 is attached to the output shaft 14 so as to overlap the base 16. The blade bracket 17 is formed in a disk shape from a steel plate or the like, and a through-hole 17a provided in the shaft center thereof is fitted into the convex portion 16b of the base 16, whereby the output shaft is attached to the support surface 16a of the base 16. 14 and the same axis. The surface of the blade bracket 17 facing away from the gear case 13 is a receiving surface 17b. A flange portion 17c is integrally provided on the outer peripheral edge of the receiving surface 17b. Covers the periphery.

  The cutting blade 15 is formed in a disk shape having a large number of saw blades 15a on the outer peripheral portion of a metal plate such as a steel plate, that is, the cutting blade 15 is a circular saw type. The cutting blade 15 is attached to the output shaft 14 so as to overlap the blade receiving bracket 17 on the side opposite to the gear case 13, and an attachment hole 15 b provided in the shaft center thereof is fitted to the convex portion 16 b of the base 16, whereby the output shaft 14 and the same axis.

  A blade presser fitting 18 is attached to the output shaft 14 so as to be positioned closer to the distal end side of the output shaft 14 than the cutting blade 15. The blade holder 18 is formed in a disk shape from steel or the like, and is attached to the output shaft 14 through a through-hole 18a provided in the shaft center. The axial end surface of the blade pressing member 18 facing the gear case 13 is a pressing surface 18b, and an annular recess 18c that is recessed toward the opposite side of the gear case 13 is provided on the axial center of the pressing surface 18b. Yes. The depth dimension in the axial direction of the recess 18c is larger than the height dimension in the axial direction of the projection 16b of the base 16, and the projection 16b of the base 16 engages with the recess 18c of the blade pressing bracket 18. Yes. When the blade retainer 18 is attached to the output shaft 14, the cutting blade 15 is sandwiched between the receiving surface 17 b of the blade retainer 17 and the retaining surface 18 b of the blade retainer 18.

  A male screw 14a is integrally provided at the tip of the output shaft 14, and a nut 19 is screwed to the male screw 14a. Then, when the nut 19 is screwed into the male screw 14 a, the cutting blade 15 is fixed to the output shaft 14 by being sandwiched between the blade receiving bracket 17 and the blade pressing bracket 18.

  The convex portion 16 b of the base 16 is formed in a shape having a two-sided width, a keyway, a cotter and the like, and is provided with through-holes 17 a and 18 a and a cutting blade 15. The mounting hole 15b is formed in a shape that can be engaged with a stopper portion around the convex portion 16b. Accordingly, the blade receiving bracket 17, the blade pressing bracket 18, and the cutting blade 15 are prevented from rotating with respect to the base 16, that is, the output shaft 14, and can rotate together with the output shaft 14.

  As shown in FIG. 1, an engine 21 as a drive source is attached to the rear end of the operation rod 12. The engine 21 is a two-cycle gasoline engine, and its output is transmitted to the gear case 13 via a transmission shaft (not shown) that is rotatably accommodated in the operation rod 12. The gear case 13 accommodates a bevel gear pair (a bevel gear pair) (not shown), and the rotation of the transmission shaft is transmitted to the output shaft 14 via the bevel gear pair. Thus, when the engine 21 is operated, the output of the engine 21 is transmitted to the output shaft 14 via the transmission shaft and the bevel gear pair, and the cutting blade 15 is driven to rotate together with the output shaft 14 by the engine 21. Thus, the brush cutter 11 is an arm connection type in which the cutting blade 15 and the engine 21 are connected by the operating rod 12.

  Although not shown, a shoulder band is attached to the operation rod 12, and the brush cutter 11 is used as a shoulder type by the shoulder band. Further, a handle portion is provided on the engine 21 side of the operating rod 12 along the shaft, and a loop handle 22 is attached to a central portion in the longitudinal direction. The operator hangs a shoulder band on the shoulder and the handle portion and the loop handle 22. Is held with both hands, the brush cutter 11 can be carried and grass cutting work can be performed. Further, a guard plate 23 is attached to the operating rod 12 at the outer peripheral side of the cutting blade 15, and the guard plate 23 prevents the grass cut by the cutting blade 15 from flying to the operator side.

  The brush cutter 11 is provided with a cutting unit 31 in order to remove the fence vine and the grass on the wall, which are difficult to cut with the metal cutting blade 15. The cutting unit 31 includes a base 32 and wires 33a, 33b, and 33c as three wires fixed to the base. In the present embodiment, the base 32 of the cutting unit 31 is constituted by the blade pressing metal fitting 18. That is, in the present embodiment, the base 32 of the cutting unit 31 is integrated with the blade pressing metal fitting 18.

  The surface of the base 32 that is configured by the blade holding member 18 and faces away from the cutting blade 15 is a fixed surface 32a that is perpendicular and circular to the axial direction of the output shaft 14, and three fixed surfaces 32a are provided on the fixed surface 32a. Wires 33a, 33b, and 33c are fixed. As these wires 33a, 33b, and 33c, for example, piano wires can be used.

  One end of the wire 33a in the longitudinal direction is fixed to the fixed surface 32a by means such as embedding or welding at a position away from the output shaft 14 in the radial direction by a predetermined distance. Further, the other end of the wire 33a in the longitudinal direction is fixed to the fixed surface by means such as embedding or welding at a point-symmetrical position about the axis of the output shaft 14 with respect to the position where one end is fixed to the fixed surface 32a. It is fixed to 32a.

  The wire 33b has one end in the longitudinal direction displaced by 60 degrees in the circumferential direction around the output shaft 14 with respect to the position where one end in the longitudinal direction of the wire 33a is fixed by means such as embedding or welding. It is fixed to the fixed surface 32a. Further, the other end of the wire 33b in the longitudinal direction is fixed to the fixed surface by means such as embedding or welding at a point-symmetrical position about the axis of the output shaft 14 with respect to the position where one end is fixed to the fixed surface 32a. It is fixed to 32a.

  At the position where one end in the longitudinal direction of the wire 33c is shifted by 60 degrees in the circumferential direction from the output shaft 14 toward the opposite side to the wire 33b with respect to the position where the one end in the longitudinal direction of the wire 33a is fixed. The fixing surface 32a is fixed by means such as embedding or welding. The other end of the wire 33c in the longitudinal direction is fixed to the fixed surface by means such as embedding or welding at a point-symmetrical position about the axis of the output shaft 14 with respect to the position where one end is fixed to the fixed surface 32a. It is fixed to 32a.

  Thus, the fixing positions of the three wires 33a, 33b, and 33c on the fixing surface 32a are shifted from each other by 60 degrees in the circumferential direction. That is, as shown in FIG. 3, the three wires 33a, 33b, and 33c are fixed to the fixed surface 32a at both ends, respectively, along the radial direction of the fixed surface 32a in plan view from the axial direction, and output shafts from each other. 14 are arranged at equal intervals in the circumferential direction with 14 as the center.

  Intermediate portions between both ends of the wires 33a, 33b, and 33c fixed to the fixed surface 32a are each curved radially, and the output shaft 14 is directed from the fixed surface 32a toward the opposite side of the cutting blade 15. It protrudes to a position that reaches the outside in the axial direction from the tip of. The lengths of the wires 33a, 33b, and 33c are the same, so that the intermediate portions of the wires 33a, 33b, and 33c intersect with each other on the extension line in the axial direction of the output shaft 14. Yes.

  When the output shaft 14 is driven to rotate by the engine 21, the wires 33a, 33b, and 33c rotate together with the output shaft. Moreover, the intermediate part of each wire 33a, 33b, 33c is elastically deformable.

  The brush cutter 11 can perform a brushing operation using a cutting blade 15 attached to the output shaft 14, and a fence crane or the like that is difficult to perform the cutting operation with a metal cutting blade 15. When the work for removing the grass on the wall surface is performed, the work can be performed by the cutting unit 31.

  As shown in FIG. 5, for example, when performing a work of cutting a temple (object to be cut) 42 wound around the fence 41 and removing the temple 42 from the fence 41, the work is performed using the cutting unit 31 instead of the cutting blade 15. Done. At this time, the brush cutter 11 is arranged such that the cutting blade 15 is parallel to the fence 41, that is, the axial direction of the cutting blade 15 is perpendicular to the fence 41. Then, with the engine 21 operating and the cutting unit 31 rotating together with the output shaft 14, the wires 33a, 33b, 33c are pressed against the fence 41 from the axial direction.

  When the wires 33a, 33b, 33c of the rotating cutting unit 31 are pressed against the fence 41 from the direction along the axial direction of the output shaft 14, as shown in FIG. 41 is elastically deformed linearly along the line 41. A portion between the intermediate portion of the wires 33a, 33b, and 33c that are in contact with the fence 41 and linearly fixed to the fixed portion of the fixing surface 32a of the wires 33a, 33b, and 33c (shown surrounded by a circle A in FIG. 6). Since the portion) is perpendicular to the temple 42, the temple 42 can be cut at this portion of the wires 33a, 33b, 33c. At this time, since the three rotating wires 33a, 33b, and 33c continuously cut the temple 42 at the two intermediate portions, the temple 42 can be cut efficiently.

  Moreover, since the intermediate part of the wires 33a, 33b, and 33c pressed against the fence 41 is linear along the fence 41, the vine 42 cut by the wires 33a, 33b, and 33c is replaced with the wires 33a, 33b, and 33c. It can be peeled off from the fence 41 by the straight part (the part indicated by the range B in FIG. 6). At this time, since the three rotating wires 33a, 33b, and 33c continuously peel off the temple 42, the temple 42 can be efficiently peeled off from the fence 41.

  Thus, in this brush cutter 11, three wires 33 a whose intermediate portion protrudes from the fixed surface 32 a are formed on the fixed surface 32 a facing the opposite side of the cutting blade 15 of the base 32 configured as the blade pressing member 18. Since 33b and 33c are provided side by side in the circumferential direction, it is possible to easily cut the vine 42 wound around the fence 41, the grass that crawls on the wall surface, and the like by these wires 33a, 33b, and 33c. Therefore, in a wide area, the cutting blade 15 attached to the output shaft 14 is used to perform the brushing work, and when removing the vine 42 wound around the fence 41 or the grass crawling on the wall surface, the cutting blade 15 is not replaced. The cutting unit 31 including the three wires 33a, 33b, and 33c can perform an operation of removing the fence, the grass on the wall surface, and the like. As a result, it is possible to facilitate the work of removing the fence, the grass on the wall surface, and the like with the brush cutter 11 and to increase the work efficiency. Moreover, since the work which removes a fence, the grass, etc. of a wall surface with the wires 33a, 33b, 33c can be performed without using the cutting blade 15, compared with the case where the said operation is performed using the cutting blade 15, the work Safety can be increased.

  Further, since the three wires 33a, 33b, and 33c are respectively bent, it is possible to easily remove the grass while entwining it. Furthermore, since each wire 33a, 33b, 33c has a structure in which both ends are fixed to the fixing surface 32a, the strength of the wires 33a, 33b, 33c is improved, and the cutting work of thick grass and vines is performed more efficiently. Can do.

  The cutting unit 31 is not limited to the fence 41 or the wall surface, but also against grass or the like grown on the road or floor surface, without applying the cutting blade 15 to the road or floor surface, the wires 33a, 33b, and 33c. The mowing work can be performed by the above.

  As shown in FIGS. 2 to 4, even if the wires 33 a, 33 b, and 33 c are elastically deformed against the fixed surface 32 a of the base 32 by being pressed against the fence or the like, the nut 19 and the tip end of the output shaft 14 are A guard wall 43 is provided in order to prevent wear due to contact with the wall surface. The guard wall 43 has a cylindrical shape coaxial with the output shaft 14, is formed integrally with the base 32, that is, the blade pressing member 18, and protrudes from the fixed surface 32 a toward the side opposite to the cutting blade 15. The protruding height of the guard wall 43 in the axial direction is larger than the height of the nut 19 from the fixed surface 32a and the protruding height of the output shaft 14 from the fixed surface 32a. As a result, even if the wires 33a, 33b, and 33c are deformed by being pressed against the fence or the like, the tips of the nut 19 and the output shaft 14 are prevented from being in contact with the fence or the like.

  As shown in FIG. 7, the brush cutter 11 can also perform the brushing work by attaching only the cutting unit 31 to the output shaft 14 without attaching the cutting blade 15 to the output shaft 14. As shown in FIG. 8, since the depth dimension in the axial direction of the concave portion 18c of the blade pressing metal fitting 18 is larger than the height dimension in the axial direction of the convex portion 16b of the base 16, the cutting blade 15 is fitted to the blade rest. Even if it is not sandwiched between the metal fitting 17 and the blade holder 18, the convex portion 16 b of the base 16 enters the concave portion 18 c of the blade holder 18 and moves the blade holder 18 toward the blade holder 17. The cutting unit 31 can be securely fixed to the output shaft 14 by bringing the holding surface 18b into contact with the receiving surface 17b.

  In this way, by attaching only the cutting unit 31 to the output shaft 14 without attaching the cutting blade 15 to the output shaft 14, the vine of the fence or the grass on the wall surface can be removed without worrying about the cutting blade 15 hitting the fence. The removal operation can be performed more easily and safely.

  In the embodiment described above, the base 32 of the cutting unit 31 is formed integrally with the blade pressing member 18. However, as shown in FIG. 9, the base 32 of the cutting unit 31 is formed by the blade pressing member 18. It can also be configured separately.

  In this case, the base 32 of the cutting unit 31 is formed of a steel material or the like in the shape of a disk having the same diameter as the blade pressing bracket 18, and is disposed so as to overlap the blade pressing bracket 18 on the side opposite to the cutting blade 15. 14 is fixed to the output shaft 14 together with the blade pressing member 18 by a nut 19 screwed to the male screw 14a. Further, the guard wall 43 for protecting the nut 19 and the output shaft 14 is integrally provided on a fixed surface 32a facing the side opposite to the cutting blade 15 of the base 32, and the wires 33a, 33b, 33c are provided on the base 32. It is fixed to the fixed surface 32a.

  In the structure shown in FIG. 9, the cutting unit 31 can be detached from the output shaft 14, and only the cutting blade 15 can be sandwiched between the blade receiving bracket 17 and the blade pressing bracket 18 and attached to the output shaft 14. Further, if necessary, the cutting unit 31 can be attached to the output shaft 14 in addition to the cutting blade 15 by a simple operation of simply sandwiching the base 32 between the nut 19 and the blade pressing member 18. Furthermore, it is also possible to attach only the cutting unit 31 to the output shaft 14 without attaching the cutting blade 15. Thus, it can be attached to and detached from the output shaft 14 of the cutting unit 31 as necessary.

  It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention.

  For example, in the above-described embodiment, the wires 33a, 33b, and 33c of the cutting unit 31 are bent and both ends are fixed to the fixing surface 32a. However, the respective members may be arranged at intervals. For example, the present invention is not limited to this, and each may be a straight line and cantilevered.

  In addition, the cutting unit 31 is configured to include the wires 33a, 33b, and 33c as wire rods. However, the cutting unit 31 is not limited to this as long as the grass on the axial direction surface of the output shaft 14 is removed. You may be comprised by the protrusion which protrudes. In this case, the protrusion may extend in an inclined direction as long as it protrudes in the axial direction from the tip of the output shaft 14.

  Further, the blade receiving bracket 17, the blade pressing bracket 18, and the cutting blade 15 are fixed to the output shaft 14 by a nut 19 that is screw-coupled to a male screw 14a provided at the tip of the output shaft 14. However, the present invention is not limited to this. First, the through-hole 18a of the blade retainer 18 is configured as a screw hole, and the blade retainer 18 is directly coupled to the male screw 14a of the output shaft 14 to output the blade holder 17, the blade retainer 18 and the cutting blade 15. It is good also as a structure fixed to the axis | shaft 14. FIG.

  Moreover, in the said embodiment, although the three wires 33a, 33b, and 33c are used as a wire, it is not restricted to this, For example, a piano wire, a nylon cord, etc. can be elastically deformed in a curving direction and cut grass etc. As long as it is possible, a wire made of another material may be used. Further, the number of the wires 33a, 33b, 33c is not limited to three, and an arbitrary number may be provided. Furthermore, the arrangement of the wires 33a, 33b, and 33c on the fixing surface 32a is not limited to the arrangement in which both ends thereof are fixed at point-symmetric positions around the output shaft 14 of the fixing surface 32a. Other arrangements may be used as long as they are arranged side by side in the circumferential direction so that some of their intermediate portions overlap each other.

  Furthermore, in the embodiment, the engine 21 is used as a drive source, but an electric motor may be used as the drive source. When using an electric motor as a drive source, the electric motor may be fixed to the gear case 13 coaxially with the cutting blade 15. In this case, a battery may be attached to the rear end of the operation rod 12.

11 Brush cutter 12 Operation rod 13 Gear case (case)
14 Output shaft 14a Male thread 15 Cutting blade 15a Saw blade 15b Mounting hole 16 Base 16a Support surface 16b Protruding portion 17 Blade receiving bracket 17a Through hole 17b Receiving surface 17c Flange portion 18 Blade holding bracket (base)
18a Through hole 18b Holding surface 18c Recess 19 Nut 21 Engine (drive source)
22 Loop handle 23 Guard plate 31 Cutting unit 32 Base 32a Fixed surface 33a, 33b, 33c Wire (wire)
41 fence 42 vine (object to be cut)
43 Guard Wall

Claims (9)

A portable brush cutter provided with an output shaft that protrudes from a case attached to the tip of the operating rod and can be fitted with a cutting blade on the tip side, and a drive source that is attached to the operating rod and rotationally drives the output shaft Because
A brush cutter having a plurality of protrusions attached to the tip end side of the output shaft, protruding in the axial direction of the output shaft, and spaced apart from each other in the circumferential direction.   The brush cutter according to claim 1, wherein the protruding portion is bent. A base attached to the distal end side of the output shaft and further rotating with the output shaft,
The protrusions are a plurality of wire rods that are provided in a circumferential direction on a fixed surface facing the opposite side of the cutting blade of the base, and whose both ends are fixed to the base and whose intermediate portions protrude from the fixed surface. Yes,
The brush cutter according to claim 1 or 2, wherein the workpiece can be cut by the plurality of rotating wires.   The cutting blade is sandwiched and fixed between a blade receiving metal fitting attached to the case side of the output shaft and the cutting edge of the output shaft attached to the distal end side of the cutting blade of the output shaft. The brush cutter according to claim 3, further comprising a blade retainer, wherein the base is constituted by the blade retainer.   The cutting blade is sandwiched and fixed between a blade receiving metal fitting attached to the case side of the output shaft and the cutting edge of the output shaft attached to the distal end side of the cutting blade of the output shaft. The brush cutter according to claim 3, further comprising a blade pressing metal fitting, wherein the base is disposed so as to overlap the blade pressing metal on a side opposite to the cutting blade.   The both ends of the wire are fixed to the fixed surface at point-symmetrical positions with the output shaft as the center, and the intermediate portion is formed in a curved shape, and are arranged at regular intervals in the circumferential direction. The brush cutter according to any one of claims 3 to 5, wherein the brush cutter is provided.   The brush cutter according to any one of claims 3 to 6, wherein the wire is a wire.   A plurality of protrusions that can be attached to an output shaft that protrudes from a case attached to the tip of the operating rod of the brush cutter, protrude in the axial direction of the output shaft, and are spaced apart from each other in the circumferential direction. A cutting unit comprising: A base attached to the output shaft protruding from the case attached to the tip of the operating rod of the brush cutter;
A plurality of wire rods arranged in a circumferential direction on a fixed surface facing the opposite side of the case of the base, each having both ends fixed to the base and an intermediate portion protruding from the fixed surface;
The cutting unit according to claim 8, wherein the object to be cut can be cut by the plurality of rotating wires.

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